CN109973447A - A kind of hydraulic control system and engineering machinery - Google Patents

Abstract

The invention belongs to technical field of engineering machinery, a kind of hydraulic control system and engineering machinery are specifically disclosed.Wherein, hydraulic control system includes variable pump, hydraulic oil container, lift controil valve and lifting cylinder, two hydraulic fluid ports of the lifting cylinder are selectively connected to the variable pump or the hydraulic oil container by lift controil valve, the rod chamber of the lifting cylinder selectively communicates with the hydraulic oil container, and the rodless cavity of the lifting cylinder selectively communicates with pressure oil-source by going up and down pressure reducing valve.Engineering machinery includes equipment and above-mentioned hydraulic control system, and hydraulic control system controls the equipment.Hydraulic control system disclosed by the invention and equipment can be improved the conformability and regulation performance of working attachment difference operating condition, improve the working efficiency and working effect of equipment and engineering machinery.

Description

A kind of hydraulic control system and engineering machinery

Technical field

The present invention relates to technical field of engineering machinery more particularly to a kind of hydraulic control systems and engineering machinery.

Background technique

Land leveller be typical one kind based on perching knife, it is a variety of attach optional towed Work machine, be mainly used for big Area smooth location, repair the roads, material scatters cleaning, scrape slope, scrape ditch, deburring canal, gutter, snow removing, farmland arrange, mine road is flat The work such as whole and opencut soil layer removing.Operator constantly manipulates left and right perching knife lifting handle, perching knife side in land leveller work Handle, perching knife rotary handle, perching knife sidesway handle and perching knife inclination angle handle wave to by corresponding multi-way valve control left and right shovel The movement such as knife lifting cylinder, perching knife side-sway oil cylinder, perching knife revolution, perching knife sidesway oil cylinder, perching knife inclination angle oil cylinder, adjusts equipment Spatial position meets operating condition construction demand.

Material cleaning and snow removing operating condition are scattered in road, purpose is only to scatter material and snow removing on cleaning road, cannot be broken Bad track road surfaces.This working condition requirement operator pays attention to pavement state the moment, constantly operates continuously each operation handle control work dress Seated position avoids the damage of road pavement structure while cleaning scatters material or snow removing.According to statistics, left and right is shoveled under this operating condition Knife handle controls 240~300 time/hour of frequency, and perching knife side-sway handle controls frequency in 100~150 times/hour, and operator is very It is easy fatigue.And if covering path surface, operator can not judge the shape of road below accumulated snow to accumulated snow when removing the snow operating condition State, it is easy to cause the impact of equipment and the destruction of road pavement.

To meet land leveller requirement under different operating conditions, reduce in operation fatigue and work progress to equipment Impact failure increases floating control function in prior art form between left and right perching knife lifting cylinder and multi-way valve and balanced valve Energy.Blade float function, left and right perching knife lifting cylinder piston end, tailpiece of the piston rod are opened when scattering material cleaning or snow removing operating condition It is communicated with hydraulic oil container, so that perching knife is acted on road surface by the weight of equipment itself, equipment perching knife is with road Reaction force that surface undulation variation generates and change automatically, so as to complete while reducing the damage of road pavement to scattering Material and cleaning and snow removing.But this scheme works because perching knife only relies on the weight effect of equipment itself, Material is less or snow removing operating condition is more effective when snowing initial scattering.Scattering that material is more, accumulated snow is thicker or accumulated snow exists When the operating conditions such as freezing state, load is larger larger to the counter-force of equipment, and only relying on the effect of equipment weight itself can not Situations such as effectively cleaning completely, unclean, snow removing that there are material cleanings is not thorough.

Summary of the invention

It is an object of the present invention to provide a kind of hydraulic control system, the work dress in engineering machinery can be realized When setting experience relatively large load, active force preloading is carried out to equipment, improves the active force of working attachment load, improves work Make the working efficiency and working effect of device.

It is another object of the present invention to provide a kind of engineering machinery, improve engineering machinery and fit to different loads situation Performance and regulation performance are answered, the working efficiency and working effect of engineering machinery are improved.

To achieve the above object, the present invention adopts the following technical solutions:

A kind of hydraulic control system comprising variable pump, hydraulic oil container, lift controil valve and the driving equipment liter The lifting cylinder of drop, two hydraulic fluid ports of the lifting cylinder by lift controil valve selectively with the variable pump or the liquid The connection of pressure oil case, the rod chamber of the lifting cylinder selectively communicate with the hydraulic oil container, the rodless cavity of the lifting cylinder Pressure oil-source is selectively communicated with by going up and down pressure reducing valve.

Further, the hydraulic control system further includes adjustable change valve, the adjustable change valve include first port, Second port, third port and the 4th port, the first port are connected to the hydraulic oil container, and the second port passes through institute Lifting pressure reducing valve to be stated to be connected to the pressure oil-source, the third port is connected to the rod chamber of the lifting cylinder, and described the Four ports are connected to the rodless cavity of the lifting cylinder.

Further, the adjustable change valve has first state and the second state, when the adjustable change valve is in institute When stating first state, the adjustable change valve is disconnected, when the adjustable change valve is in second state, the first end Mouth is connected to the third port, and second port is connected to the fourth port.

Further, the adjustable change valve also has the third state, when the adjustable change valve is in the third shape When state, the third port and the 4th port are connected to the first port.

Further, the lifting cylinder includes left lifting cylinder and right lifting cylinder arranged side by side, the left lifting The rod chamber of the rod chamber of oil cylinder and the right lifting cylinder can selectively communicate with the hydraulic oil container, the left lifting oil The rodless cavity of the rodless cavity of cylinder and the right lifting cylinder passes through the lifting pressure reducing valve respectively and the pressure oil-source selects The connection of selecting property.

Further, the adjustable change valve is three-position four-way electromagnetic directional valve.

Further, the pressure oil-source is the pressure oil controlled in oil circuit in the hydraulic control system.

Further, the lifting pressure reducing valve is proportional pressure-reducing valve.

Further, the rodless cavity of the lifting cylinder is connected to by first switch valve with the first accumulator.

Further, the hydraulic control system further includes side-sway control valve and the side-sway for driving the equipment side-sway Oil cylinder, the variable pump and the hydraulic oil container pass through the side-sway control valve selectively rod chamber with the side-sway oil cylinder It is connected to rodless cavity.

Further, the rodless cavity of the side-sway oil cylinder is connected to by second switch valve with the second accumulator, and/or, institute The rod chamber for stating side-sway oil cylinder is connected to by third switch valve with third accumulator.

Further, second switch valve and/or the third switch valve are often-cutting type two-position two-way electromagnetic directional valve.

Further, the side-sway control valve and the lift controil valve are the control plate valve in multi-way valve, the multichannel Valve is load sensibility multi-way valve or the multi-way valve is electric proportional multi-way valve.

Further, the hydraulic control system further includes rotary control valve and the revolution for driving the equipment revolution Driving assembly, two hydraulic fluid ports of the rotary drive assembly pass through the first rotation oil and the second rotation oil and described time respectively Turn two delivery outlets connection of control valve, two input ports of the rotary control valve respectively with the variable pump and described hydraulic Fuel tank connection.

Further, it is provided with the first pilot control valve in first rotation oil, is set in second rotation oil It is equipped with the second pilot control valve, guide's hydraulic fluid port of first pilot control valve and second pilot control valve passes through revolution Pressure reducing valve is connected to the pressure oil-source.

A kind of engineering machinery, including equipment further include the upper hydraulic control system.

Further, the engineering machinery is land leveller, and the equipment is perching knife.

The beneficial effects of the present invention are:

Hydraulic control system provided by the invention, by making the rod chamber of lifting cylinder selectively communicate with hydraulic oil container, So that the rodless cavity of lifting cylinder is selectively communicated with pressure oil-source, when equipment is in normal operating conditions, can manipulate Lift controil valve controls the connection situation of lifting cylinder rod chamber and rodless cavity and hydraulic oil container or variable pump, thus to lifting The lifting of oil cylinder is controlled；When the loading condition that equipment faces is unintelligible and load is relatively large, gone up and down by making The rod chamber of oil cylinder is connected to hydraulic oil container, so that the rodless cavity of lifting cylinder is connected to pressure oil-source, the oil pressure of pressure oil-source acts on In rodless cavity, oil pressure is zero in rod chamber, to make the telescopic rod of lifting cylinder work under the action of gravity and rodless cavity oil pressure Make, increases telescopic rod to the active force of load, realize hydraulic control system to the preloading procedure of equipment, so as to mention The working efficiency and working effect of high equipment；Furthermore since pressure oil-source is connected to pressure oil-source by lifting pressure reducing valve, when One timing of pressure oil-source oil pressure realizes the electrodeless adjustment to oil pressure in rodless cavity by the decompression amplitude of adjusting pressure reducing valve, thus The preloading force to equipment can be changed according to load substantially situation, improve the regulation performance and adaptation of equipment Performance.

Engineering machinery provided by the invention can be improved engineering machinery to not by using above-mentioned hydraulic control system With the conformability and regulation performance of loading condition, the working efficiency and effect of engineering machinery are improved.

Detailed description of the invention

Fig. 1 is the schematic diagram for the hydraulic control system that the embodiment of the present invention one provides；

Fig. 2 is the schematic diagram of liquid separation pressure control system in the middle part of Fig. 1；

Fig. 3 is the schematic diagram of hydraulic control system provided by Embodiment 2 of the present invention；

Fig. 4 is the schematic diagram for the hydraulic control system that the embodiment of the present invention three provides；

Fig. 5 is the partial schematic diagram for the revolution hydraulic control module that the embodiment of the present invention three provides；

Fig. 6 is the partial schematic diagram for the revolution hydraulic control module that the embodiment of the present invention four provides；

Fig. 7 is the partial schematic diagram for the revolution hydraulic control module that the embodiment of the present invention five provides；

Fig. 8 is the schematic diagram for the hydraulic control system that the embodiment of the present invention six provides；

Fig. 9 is the hydraulic schematic diagram of multi-way valve in Fig. 8.

It is marked in figure as follows:

The main oil outlet of 11-；12- oil return opening；13- pressure oil-source；

2- multi-way valve；21- lift controil valve；22- side-sway control valve；23- rotary control valve；

31- lifting cylinder；32- side-sway oil cylinder；33- rotary drive assembly；331- slewing directional control valve；3311- first is inputted Hydraulic fluid port；The second input oil port of 3312-；The first output oil port of 3313-；The second output oil port of 3314-；3315- third output oil port； The 4th output oil port of 3316-；The first angling cylinder of 332-；The second angling cylinder of 333-；334- hydraulic motor；335- turbine slows down Machine；

41- up and down balance system valve；42- side-sway balanced valve；43- turns round balanced valve；The first pilot control valve of 431-；4311- One guide's hydraulic fluid port；The second pilot control valve of 432-；4321- the second guide hydraulic fluid port；The first check valve of 433-；434- second is unidirectional Valve；The first shuttle valve of 435-；The first oil outlet of 4351-；The second shuttle valve of 436-；The second oil outlet of 4361-；

5- adjustable change valve；51- first port；52- second port；53- third port；The 4th port 54-；

61- first switch valve；62- second switch valve；63- third switch valve；

The first accumulator of 71-；The second accumulator of 72-；73- third accumulator；

81- goes up and down pressure reducing valve；82- turns round pressure reducing valve；

The first rotation oil of 91-；The second rotation oil of 92-.

Specific embodiment

The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.

In the description of the present invention unless specifically defined or limited otherwise, term " connected ", " connection ", " fixation " are answered It is interpreted broadly, for example, it may be being fixedly connected, may be a detachable connection, or is integral；It can be mechanical connection, It can be electrical connection；It can be directly connected, the company inside two elements can also be can be indirectly connected through an intermediary Logical or two elements interaction relationship.For the ordinary skill in the art, can be understood with concrete condition above-mentioned The concrete meaning of term in the present invention.

In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower" It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above " Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of First feature horizontal height is less than second feature.

In the description of the present embodiment, term " on ", "lower", " right side ", etc. orientation or positional relationships be based on shown in attached drawing Orientation or positional relationship, be merely for convenience of description and simplification operation, rather than the device or element of indication or suggestion meaning It must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.In addition, Term " first ", " second " are only used to distinguish between description, and have no special meaning.

Embodiment one

Fig. 1 is the schematic diagram of hydraulic control system provided in an embodiment of the present invention, and Fig. 2 is part hydraulic control system in Fig. 1 The schematic diagram of system.As illustrated in fig. 1 and 2, a kind of hydraulic control system is present embodiments provided, for the dress that works in engineering machinery The working condition set is regulated and controled, and the adjusting of performance of the equipment under different operating conditions is realized, to improve the work of equipment Make efficiency and working effect.

In the present embodiment, engineering machinery can be land leveller, bull-dozer etc., and equipment can accordingly be land leveller In perching knife, the perching knife in bull-dozer etc..Using engineering machinery as land leveller in the present embodiment, equipment be perching knife for liquid Pressure control system is illustrated.

Specifically, as shown in Figure 1, hydraulic control system provided in this embodiment includes hydraulic oil container, variable pump and lifting Hydraulic control module, raise-lower hydraulic control module include lift controil valve 21, up and down balance system valve 41 and lifting cylinder 31.Hydraulic oil The oil outlet of case is connected to the oil inlet of variable pump, for providing high pressure oil for lifting cylinder 31；The telescopic rod of lifting cylinder 31 It is connect with equipment, for driving equipment elevating movement；The rod chamber and rodless cavity of lifting cylinder 31 respectively with lifting Two output oil ports of balanced valve 41 are connected to, two input oil ports of up and down balance system valve 41, two with lift controil valve 21 respectively Output oil port connection, the main oil outlet 11 of variable pump and the oil return opening 12 of hydraulic oil container are defeated with two of lift controil valve 21 respectively Oiler connection.

In the present embodiment, lift controil valve 21 at least has first state, the second state and the third state: when lifting is controlled When valve 21 processed is in first state, main oil outlet 11 is connected to the rodless cavity of lifting cylinder 31, oil return opening 12 and lifting cylinder 31 Rod chamber connection, high pressure oil by main oil outlet 11, lift controil valve 21, up and down balance system valve 41 entrance lifting cylinder 31 nothing Rod cavity pushes the piston rod of lifting cylinder 31 to stretch out, and the working oil in rod chamber passes through up and down balance system valve 41, lift controil valve 21, oil return opening 12 is back in hydraulic oil container；When lift controil valve 21 is in the second state, main oil outlet 11 and lifting cylinder 31 rod chamber connection, oil return opening 12 are connected to the rodless cavity of lifting cylinder 31, and high pressure oil is through main oil outlet 11, lift controil valve 21, up and down balance system valve 41 enters the rod chamber of hydraulic cylinder, and piston rod is pushed to retract, and the working oil in rodless cavity is through up and down balance system Valve 41, lift controil valve 21, oil return opening 12 are back in hydraulic oil container；When lift controil valve 21 is in the third state, master goes out Hydraulic fluid port 11 is disconnected with the rod chamber of lifting cylinder 31 and rodless cavity, i.e. oil pressure in lifting cylinder 31 in rodless cavity and rod chamber It is zero.In the present embodiment, the setting of lift controil valve 21 and up and down balance system valve 41 is ordinary skill in the art means, The present embodiment is no longer repeated.

When equipment is in normal operating conditions, the spool by operating lift controil valve 21 is acted, and controls variable The connection situation of the main oil outlet 11 of pump and the oil return opening 12 of hydraulic oil container and rod chamber and rodless cavity realizes that lifting cylinder 31 is transported The adjusting of dynamic state.In the present embodiment, the movement shape of the telescopic rod of lifting cylinder 31 is controlled by manipulation lift controil valve 21 State is ordinary skill in the art means, and the present embodiment is no longer repeated.

To reduce staff to the manipulation frequency of lift controil valve 21, the adaptive of working attachment difference operating condition is improved Performance and self-tuning performance, while improving the working efficiency and work quality of equipment, in the present embodiment, lifting cylinder 31 Rodless cavity also pass through lifting pressure reducing valve 81 selectively communicate with pressure oil-source 13, the rod chamber of lifting cylinder 31 can be selectively It is connected to the oil return opening 12 of hydraulic oil container, so as to make equipment have the operating mode of preloading.

When land leveller is in unrestrained material is more, accumulated snow is thicker or accumulated snow exists under the operating conditions such as freezing when, due to load compared with It is larger to the counter-force of equipment greatly, and because material or accumulated snow are covered, operator be difficult to judge surface conditions such as deceleration strip position, Well lid position etc. be easy to cause work to fill if operator controls lifting cylinder 31 by manipulating lift controil valve 21 The destruction of the impact and road pavement set, and it be easy to cause operator's operation fatigue.At this point it is possible to by making at lift controil valve 21 In the third state, and so that the rodless cavity of lifting cylinder 31 is connected to pressure oil-source 13 by lifting pressure reducing valve 81 and be connected to rod chamber Oil return opening 12, the pressure oil of pressure oil-source 13 enter the rodless cavity of lifting cylinder 31 by lifting pressure reducing valve 81, rod chamber with return Hydraulic fluid port 12 is connected to, and therefore, the piston rod of lifting cylinder 31 carries out load under the active force of self gravity and rodless cavity oil pressure Effect increases the loading effect power of working attachment load, improves the work effect of the cleaning of working attachment material or accumulated snow cleaning Rate and cleaning effect.Meanwhile, it is capable to reduce operator to the operation frequency of lift controil valve 21, make equipment according to road surface feelings Condition is adaptively cleared up, and reduces the impact to equipment and road pavement is avoided to damage.And by lifting cylinder 31 Rodless cavity and pressure oil-source 13 between connection lifting pressure reducing valve 81 when the timing of oil pressure one of pressure oil-source 13 can pass through liter It drops pressure reducing valve 81 and adjusts the oil pressure size for entering rodless cavity, to realize the load to equipment difference preloaded force, increase The adaptive performance and regulation performance of equipment.

It preferably, is originally being in embodiment, pressure oil-source 13 is the pressure oil in hydraulic system control oil circuit, and pressure is steady It is fixed, not by the load effect of equipment.In other embodiments, pressure oil-source 13 may be the tool pumped out in hydraulic oil container There is the working oil of certain pressure.

In the present embodiment, lifting pressure reducing valve 81 is preferably solenoid valve, passes through control and goes up and down 81 electrical current of pressure reducing valve Size, control lifting pressure reducing valve 81 degree of pressure reduction.And the it is further preferable that load that can be met with by detection equipment The size of reaction force, control is passed through the size of current of lifting pressure reducing valve 81, to control the rodless cavity into lifting cylinder 31 Oil pressure size, to realize under preloading mode, the adjusting to equipment preloaded force.

In the present embodiment, it is further preferable that lifting pressure reducing valve 81 is proportional pressure-reducing valve, pressure reducing valve 81 is gone up and down by control Electrical current size, adjust the decompression ratio of proportional pressure-reducing valve, be more advantageous to enter 31 rodless cavity of lifting cylinder oil pressure Size is regulated and controled.And it is further preferable that the corresponding ratio of different loads can be set in the control module of hydraulic control system The decompression ratio of example pressure reducing valve, matches the operating status of equipment preferably with road load, improves equipment oneself Conformability, meanwhile, improve the working efficiency and working effect of equipment.

In this embodiment, it is preferred that realizing rod chamber and rodless cavity and oil return opening 12 or pressure using adjustable change valve 5 The selectivity of oil sources 13 is connected to.Specifically, in the present embodiment, adjustable change valve 5 is three-position four-way electromagnetic directional valve, has the Single port 51, second port 52, third port 53 and the 4th port 54.First port 51 is connected to oil return opening 12；Second port 52 are connected to the oil outlet of lifting pressure reducing valve 81, and the oil inlet of lifting pressure reducing valve 81 is connected to pressure oil-source 13；Third port 53 It is connected to the rod chamber of lifting cylinder 31, the 4th port 54 is connected to the rodless cavity of lifting cylinder 31.

Adjustable change valve 5 at least has first state and the second state, (Fig. 2 when adjustable change valve 5 is in first state Shown in middle position), adjustable change valve 5 disconnects, and equipment is in normal mode of operation or non-operating mode；Work as adjustable change valve 5 be in the second state when (right position shown in Fig. 2), first port 51 is connected to third port 53, the 4th port 54 and second end Mouth 52 is connected to, and equipment, which is in, preloads operating mode.

It, can be by the connection oil circuit of rod chamber in lifting cylinder 31 and oil return opening 12 in other one embodiment Switch valve for controlling oil circuit on-off is set, it is real by the opening and closing of control switch valve and the break-make situation of lifting pressure reducing valve 81 The rod chamber of existing lifting cylinder 31 is connected to rodless cavity with the selectivity of oil return opening 12 and pressure oil-source 13.In other another realities It applies in example, adjustable change valve 5 can also be arranged to two position and four-way reversing valves and realize adjustable change valve 5 in first state and second Switching between state.

In the present embodiment, adjustable change valve 5 is also equipped with the third state, when adjustable change valve 5 is in the third state, adjusts The spool of section reversal valve 5 is located at left position, and the rod chamber and rodless cavity of lifting cylinder 31 are connected to the oil return opening of hydraulic oil container 12. At this point, the oil pressure in the rod chamber and rodless cavity of lifting cylinder 31 is zero, equipment only acts on ground under the effect of gravity Face, and acted under gravity and load reactive forces, equipment is in floating operating mode.In floating operating mode Under, equipment changes with the fluctuating on road surface, and completes cleaning or the Snow removing of unrestrained material.Floating operating mode is applicable in In the unrestrained operating condition that material is relatively small or accumulated snow is relatively thin, road pavement can be reduced while reducing operator's operation fatigue Damage and impact to equipment.

In the present embodiment, it is three-position four-way electromagnetic directional valve by setting adjustable change valve 5, can be realized adjusting commutation Switching of the valve 5 between first state, the second state and the third state, to realize the operating mode of equipment in normal work Switching between operation mode, preloading operating mode and floating operating mode, structure is simple, easy to operate, and enhances work Device is to the regulation performance and adaptive performance under different surface conditions.

For land leveller, in operating conditions such as mine road, the removing of mining area soil layer, smooth, the farmland reclamation of wastelands of sedendary soil, because In soil layer may containing the fixed obstacles such as stone, tree root, operator because that can not judge Obstacle Position state in construction soil layer, Equipment perching knife state cannot be adjusted in time, it is easy to impact and damage of the barrier to equipment are caused, to complete machine knot Component forms fatigue impact, influences complete machine structure part fatigue life, while forming certain security risk to operator.For other Engineering machinery, equipment also frequently encounter the operating condition of load excessive at work, therefore, in the present embodiment, are more highly preferred to Ground, equipment are also equipped with overload protection mode.Specifically, the rodless cavity of lifting cylinder 31 is communicated with by first switch valve 61 First accumulator 71 realizes 31 rodless cavity of lifting cylinder and the first accumulator 71 by controlling the on-off of first switch valve 61 Connection.

In the present embodiment, in the state that adjustable change valve 5 is in first state and first switch valve 61 is connected, work Device enters overload protection mode.At this point, equipment is in the impact by relatively large load, equipment is lifted upwards, is made The piston rod of lifting cylinder 31 moves upwards extruding rodless cavity, and the working oil in rodless cavity flows to the first accumulator 71 and absorbs part Impact prevents equipment and load hard collision and causes impact failure.Work after loading reduction, in the first accumulator 71 Oil is back in rodless cavity, realizes the normal work of equipment.That is, by the first accumulator 71 with lifting cylinder 31 without bar Chamber connection, can play buffer function to the impact that equipment is subjected to, equipment is enable to avoid biggish load effect, and It can float with rugged road surface, reduce the impact of equipment, improve the service quality of equipment.

In this embodiment, it is preferred that first switch valve 61 is two-position two-way solenoid valve, have the first accumulator 71 with The second state (Fig. 2 institute that the first state (left position shown in Fig. 2) of rodless cavity connection and the first accumulator 71 are disconnected with rodless cavity The right position shown).And two-position two-way solenoid valve is often-cutting type solenoid valve, switches to first state by the second state after energization.? In other embodiments, first switch valve 61 may be the valve that other types can control oil circuit on-off.

In the present embodiment, there are two lifting cylinders 31 for connection side by side, to improve the job stability of equipment.Two Lifting cylinder 31 is respectively left lifting cylinder and right lifting cylinder.Each lifting cylinder 31 is correspondingly arranged on a set of up and down balance system Valve 41, lift controil valve 21, adjustable change valve 5, lifting pressure reducing valve 81, first switch valve 61 and the first accumulator 71, Ke Yitong It crosses and the operating status that regulation adjusts equipment individually is carried out to left lifting cylinder or right lifting cylinder, a left side can also be regulated and controled simultaneously The operating status of lifting cylinder and right lifting cylinder regulates and controls the operating status of equipment.

That is, being provided with normal mode of operation for each lifting cylinder 31, floating operating mode, preloading operating mode With overload protection mode:

When adjustable change valve 5 is in first state and first switch valve 61 disconnects, lifting cylinder 31, which is in, to be worked normally Mode, at this point, stretching out or contracting by the telescopic rod that operator manipulates the spool action control lifting cylinder 31 of lift controil valve 21 It returns；

When adjustable change valve 5 is in the third state, lift controil valve 21 is in the third state and first switch valve 61 disconnects When, lifting cylinder 31 is in floating operating mode, and equipment acts on ground under self gravitation effect and with surface relief；

When adjustable change valve 5 is in the second state, lift controil valve 21 is in the third state, first switch valve 61 disconnect and When going up and down the energization of pressure reducing valve 81, lifting cylinder 31, which is in, preloads operating mode, and equipment is in self gravity and pressure oil-source It works under 13 preloading effect；

When adjustable change valve 5 is in first state, lift controil valve 21 is in the third state and first switch valve 61 is connected When, lifting cylinder 31 is in overload protection mode.

In the present embodiment, when equipment is in floating operating mode, preloading operating mode and overload protection mode Under, it so that lift controil valve 21 is in the third state, so that operator is not needed operation lift controil valve 21, realize equipment Automatic adjusument to surface conditions under different mode.But it is understood that being in floating operating mode, pre- in equipment It loads under operating mode or overload protection mode, operator can also operate to regulate and control lifting cylinder lift controil valve 21 31 working condition, realization are adaptively combined with manual operation.

The present embodiment additionally provides a kind of engineering machinery, including equipment and above-mentioned hydraulic control system.

Embodiment two

Fig. 3 is the schematic illustration of hydraulic control system provided in an embodiment of the present invention.As shown in figure 3, the present embodiment mentions Supply a kind of hydraulic control system comprising the hydraulic control system that embodiment one provides, and further include that can be realized work dress Set the side swing hydraulic control module of side-sway control.

Specifically, as shown in figure 3, side swing hydraulic control module includes side-sway control valve 22, side-sway balanced valve 42 and can Drive the side-sway oil cylinder 32 of equipment side-sway.The oil return opening 12 of the main oil outlet 11 of variable pump and hydraulic oil container respectively with side-sway Two input ports of control valve 22 are connected to；The rod chamber and rodless cavity of side-sway oil cylinder 32 are defeated with two of side-sway balanced valve 42 respectively Outlet；Two input ports of side-sway balanced valve 42 are respectively communicated with two delivery outlets of side-sway control valve 22.

When equipment is in normal operating conditions, the spool by operating side-sway control valve 22 is acted, and control master goes out The connection situation of hydraulic fluid port 11 and oil return opening 12 and side-sway oil cylinder 32 rod chamber and rodless cavity is realized to 32 motion state of side-sway oil cylinder Adjusting.In the present embodiment, it is controlled by setting side-sway control valve 22 and side-sway balanced valve 42 and operation side-sway control valve 22 The movement of side-sway oil cylinder 32 is ordinary skill in the art means, and the present embodiment is no longer repeated.

In the present embodiment, it in order to further decrease the impact that equipment is subjected at work, is provided for equipment The rodless cavity of protection, side-sway oil cylinder 32 is connected to by second switch valve 62 with the second accumulator 72, the rod chamber of side-sway oil cylinder 32 It is connected to by third switch valve 63 with third accumulator 73.By controlling the unlatching of second switch valve 62 and third switch valve 63, Side-sway oil cylinder 32 can be made to carry out overload protection mode.

When equipment carries out side-sway work, equipment realizes work by the stretching motion of 32 piston rod of side-sway oil cylinder Make swinging for device.By opening second switch valve 62, it is connected to rodless cavity with the second accumulator 72, when equipment meets with When meeting relatively large load, which may cause 32 piston rod of side-sway oil cylinder to the reaction force of equipment and retracts, and make piston rod Impact rodless cavity, at this point, working oil in rodless cavity enters in the second accumulator 72, absorb part and impact, to equipment into Row buffering protection；Or by opening third switch valve 63, it is connected to rod chamber with third accumulator 73, if the load fills work The reaction force set causes the piston rod of side-sway oil cylinder 32 to stretch out, and piston rod is made to impact rod chamber, the at this time work in rod chamber Oil, which enters in third accumulator 73, absorbs part impact, protects to equipment.After load reactive forces disappear, work Oil is back in rodless cavity from the second accumulator 72 or working oil is back in rod chamber from third accumulator 73, fills work Put back into multiple normal work.

That is, in the present embodiment, by being connected to the rodless cavity of side-sway oil cylinder 32 with the second accumulator 72, by rod chamber and The connection of three accumulators 73, the load shock that can be subjected to for side-sway oil cylinder 32 in left and right side oscillation provide protection, thus into One step provides protection to equipment.

In the present embodiment, second switch valve 62 and third switch valve 63 are two-position two-way solenoid valve, work as second switch When the spool of valve 62 is in left position, second switch valve 62 is disconnected；When the spool of second switch valve 62 is in right position, the second accumulation of energy Device 72 is connected to rodless cavity.When the spool of third switch valve 63 is in left position, third switch valve 63 is disconnected；When third switch valve When 63 spool is in right position, third accumulator 73 is connected to rod chamber.Pass through control second switch valve 62 and third switch valve 63 current switching control second switch valve 62 and third switch valve 63 opens or closes.And second switch valve 62 and third are opened Closing valve 63 is often-cutting type solenoid valve, is in an off state when not energized, in the open state after energization.In other implementations In example, second switch valve 62 and third switch valve 63 can also be the other kinds of valve that can control oil circuit on-off.

In the present embodiment, by the second accumulator 72 of setting and third accumulator 73, side-sway oil cylinder 32 can be made to have Normal mode of operation and overload protection mode:

When second switch valve 62 and third switch valve 63 disconnect, side-sway oil cylinder 32 enters normal mode of operation, passes through behaviour Make the connection situation that side-sway control valve 22 controls main oil outlet 11 and oil return opening 12 and side-sway oil cylinder 32 rod chamber and rodless cavity, adjusts Control the operating status of side-sway oil cylinder 32；

It is opened when second switch valve 62 and third switch valve 63 are powered, side-sway oil cylinder 32 enters overload protection mode, at this point, On the basis of not operating side-sway control valve 22, the impact that can be subjected to side-sway oil cylinder 32 is buffered.

In the present embodiment, overload protection mode can be used alone, for equipment work carry out lifting work or Overload protection is provided when side-sway works for side-sway oil cylinder 32.Overload protection mode can also be used cooperatively with normal mode of operation, To provide overload protection when the work of equipment side-sway.

It is understood that in the present embodiment, the overload protection mode and normal mode of operation of lifting cylinder 31 It is used cooperatively with the overload protection mode of side-sway oil cylinder 32, it is multi-faceted to provide overload protection for equipment, improve equipment Shock resistance, reduce the impact force that is subjected to of equipment.

The present embodiment additionally provides a kind of engineering machinery, including equipment, further includes hydraulic control system as described above System.

Embodiment three

Fig. 4 is the schematic diagram of hydraulic control system provided in an embodiment of the present invention, and Fig. 5 is provided in an embodiment of the present invention time Turn the partial schematic diagram of hydraulic control module.As shown in Figures 4 and 5, a kind of hydraulic control system is present embodiments provided comprising The raise-lower hydraulic control module and side swing hydraulic control mould in raise-lower hydraulic control module and/or embodiment two in embodiment one Block further includes revolution hydraulic control module.

Specifically, revolution hydraulic control module includes rotary control valve 23, turns round balanced valve 43 and rotary drive assembly 33, The main oil outlet 11 of variable pump and the oil return opening 12 of hydraulic oil container are respectively communicated with two input ports of rotary control valve 23, revolution control Two delivery outlets of valve 23 processed are connected to two input ports of revolution balanced valve 43, are turned round two delivery outlets of balanced valve 43 and are returned Turn two hydraulic fluid ports connection of driving assembly 33.Under 33 normal operating condition of rotary drive assembly, by manipulating rotary control valve 23, the connection situation of main oil outlet 11 and oil return opening 12 and 33 two hydraulic fluid ports of rotary drive assembly is controlled, is driven to adjust revolution The operating status of dynamic component 33.

In the present embodiment, rotary drive assembly 33 includes slewing directional control valve 331, the first angling cylinder 332 and second time Turn oil cylinder 333.There are two input oil port and four output oil ports for the tool of slewing directional control valve 331, and two input oil ports are respectively first Input oil port 3311 and the second input oil port 3312, the first input oil port 3311 pass through the first rotation oil 91 and rotary control valve 23 delivery outlet connection, the second input oil port 3312 are defeated by another of the second rotation oil 92 and rotary control valve 23 Outlet.

Four output oil ports are respectively the first output oil port 3313, the second output oil port 3314, third output oil port 3315 With the 4th output oil port 3316, the first output oil port 3313 is connected to the rodless cavity of the first angling cylinder 332, the second output oil port 3314 are connected to the rodless cavity of the second angling cylinder 333, and the rod chamber of third output oil port 3315 and the first angling cylinder 332 connects Logical, the 4th output oil port 3316 is connected to the rod chamber of the second angling cylinder 333.

In the present embodiment, slewing directional control valve 331 has eight states:

When slewing directional control valve 331 is in first state, the first input oil port 3311 is connected to the first output oil port 3313, Second input oil port 3312 is connected to third output oil port 3315, and the second output oil port 3314 and the 4th output oil port 3316 connect Logical, i.e., one in the rod chamber and rodless cavity of the first angling cylinder 332 is connected to main oil inlet 11, another and oil return opening 12 Connection, the second angling cylinder 333 are in the quick condition from connection；

When slewing directional control valve 331 is in the second state, the first output oil port 3313 and the 4th output oil port 3316 with The connection of first input oil port 3311, the second output oil port 3314 and third output oil port 3315 connect with the second input oil port 3312 Logical, i.e., one in the rod chamber and rodless cavity of the first angling cylinder 332 and the second angling cylinder 333 and main oil inlet 11 connect Logical, another is connected to oil return opening 12, and the retracted position of the first angling cylinder 332 and the second angling cylinder 333 is opposite；

When slewing directional control valve 331 is in the third state, the first input oil port 3311 is connected to the 4th output oil port 3316, Second input oil port 3312 is connected to the second output oil port 3314, and the first output oil port 3313 connects with third output oil port 3315 Logical, i.e., one in the rod chamber and rodless cavity of the second angling cylinder 333 is connected to main oil inlet 11, another and oil return opening 12 Connection, the first angling cylinder 332 are in the quick condition from connection；

When slewing directional control valve 331 is in four states, third output oil port 3315 or the 4th output oil port 3316 with The connection of first input oil port 3311, the first output oil port 3313 and the second output oil port 3314 connect with the second input oil port 3312 Logical, i.e., one in the rod chamber and rodless cavity of the first angling cylinder 332 and the second angling cylinder 333 and main oil inlet 11 connect Logical, another is connected to oil return opening 12, and the first angling cylinder 332 is identical with the telescopic direction of the second angling cylinder 333；

When slewing directional control valve 331 is in five states, the first input oil port 3311 is connected to third output oil port 3315, Second input oil port 3312 is connected to the first output oil port 3313, and the second output oil port 3314 and the 4th output oil port 3316 connect Logical, i.e., one in the rod chamber and rodless cavity of the first angling cylinder 332 is connected to main oil inlet 11, another and oil return opening 12 Connection, and the retracted position when retracted position of the first angling cylinder 332 and revolving valve be in first state is on the contrary, second turns round Oil cylinder 333 is in the quick condition from connection；

When slewing directional control valve 331 is in six states, the second output oil port 3314 and third output oil port 3315 with The connection of first input oil port 3311, the first output oil port 3313 and the 4th output oil port 3316 connect with the second input oil port 3312 Logical, i.e., one in the rod chamber and rodless cavity of the first angling cylinder 332 and the second angling cylinder 333 and main oil inlet 11 connect Logical, another is connected to oil return opening 12, and the retracted position of the first angling cylinder 332 and the second angling cylinder 333 is on the contrary, first The retracted position of angling cylinder 332 and the second angling cylinder 333 is in opposite when the second state with slewing directional control valve 331；

When slewing directional control valve 331 is in seven states, the first input oil port 3311 is connected to the second output oil port 3314, Second input oil port 3312 is connected to the 4th output oil port 3316, and the first output oil port 3313 connects with third output oil port 3315 Logical, i.e., one in the rod chamber and rodless cavity of the second angling cylinder 333 is connected to main oil inlet 11, another and oil return opening 12 Connection, and the operating status of the second angling cylinder 333 and slewing directional control valve 331 when be in the third state on the contrary, the first revolution is oily Cylinder 332 is in the quick condition from connection；

When slewing directional control valve 331 is in state eight-shaped, the first output oil port 3313 and the second output oil port 3314 with The connection of first input oil port 3311, third output oil port 3315 and the 4th output oil port 3316 connect with the second input oil port 3312 Logical, i.e., one in the rod chamber and rodless cavity of the first angling cylinder 332 and the second angling cylinder 333 and main oil inlet 11 connect Logical, another is connected to oil return opening 12, and the first angling cylinder 332 is identical with the telescopic direction of the second angling cylinder 333, and first The retracted position of angling cylinder 332 and the second angling cylinder 333 and slewing directional control valve 331 are in opposite when four states.

That is, by control slewing directional control valve 331 in spool movement, can make slewing directional control valve 331 first state extremely Switch between free position between state eight-shaped, so as to by simultaneously or separately controlling the first angling cylinder 332 and the The different angle revolution of equipment is realized in the operation of two-revolution oil cylinder 333.

In the present embodiment, pass through the movement of slewing directional control valve 331, the first angling cylinder 332 and the second angling cylinder 333 The specific structure for controlling the revolution of equipment can refer to the structure in the patent application No. is 201420753247.6, this implementation Example is no longer repeated.

In the present embodiment, revolution balanced valve 43 includes being arranged in parallel the first pilot control in the first rotation oil 91 Valve 431 and the first check valve 433, and the second pilot control valve 432 and second being arranged in parallel in the second rotation oil 92 Check valve 434.The oil inlet of first pilot control valve 431 and first guide's hydraulic fluid port 4311 connect with the first input oil port 3311 Logical, the oil outlet of the first pilot control valve 431 is connected to a delivery outlet of rotary control valve 23；First check valve 433 allows Working oil is circulated to the first input oil port 3311 from rotary control valve 23；The oil inlet of second pilot control valve 432 and second is first Oil diverting port 4321 is connected to the second input oil port 3312, oil outlet and the rotary control valve 23 of the second pilot control valve 432 The connection of another delivery outlet；Second one-way valve 434 allows working oil to flow into the second input oil port 3312 from rotary control valve 23.

Turning round balanced valve 43 further includes the first shuttle valve 435, the first oil inlet of the first shuttle valve 435 and the first check valve 433 Oil inlet connection, the second oil inlet of the first shuttle valve 435 is connected to the oil inlet of second one-way valve 434, the first shuttle valve 435 First oil outlet 4351 can first guide's hydraulic fluid port 4311 be connected to second guide's hydraulic fluid port 4321.

When rotary drive assembly 33 is under normal mode of operation, the first revolution is adjusted by operation rotary control valve 23 The connection situation of oil circuit 91, the second rotation oil 92 and main oil inlet 11 and oil return opening 12.With the first rotation oil 91 with it is main into For the connection of hydraulic fluid port 11 and the second rotation oil 92 are connected to oil return opening 12, high pressure oil is entered first time by rotary control valve 23 Turn oil circuit 91, the oil part in the first rotation oil 91 enters in slewing directional control valve 331 by the first check valve 433, part oil Into in the first oil inlet of the first shuttle valve 435, the oil in the second rotation oil 92 enters the second oil inlet of the first shuttle valve 435 In, since the oil pressure in the first rotation oil 91 is higher than the oil pressure in the second rotation oil 92, the first oil inlet of the first shuttle valve 435 Mouth is connected to the first oil outlet 4351, and the part oil in the first rotation oil 91 enters first guide's hydraulic fluid port through the first shuttle valve 435 4311 and second guide's hydraulic fluid port 4321 and act on and the guide of the first pilot control valve 431 and the second pilot control valve 432 respectively On spool.When the oil pressure in the first rotation oil 91 reaches the guide of the first pilot control valve 431 and the second pilot control valve 432 When valve core movement pressure, the pilot valve movement in the first pilot control valve 431 and the second pilot control valve 432 makes the first guide Control valve 431 and the second pilot control valve 432 are opened, and rotary drive assembly 33 can pass through the first pilot control valve 431 and the Two pilot control valves 432 carry out oil return pressure release.

When the oil pressure in the first rotation oil 91 and the second rotation oil 92 is respectively less than the first pilot control valve 431 and second When the pressure that pilot control valve 432 is opened, the first pilot control valve 431 and the second pilot control valve 432 are in close state, the Working oil in 91 second rotation oil 92 of single-revolution oil circuit can not pass through the first pilot control valve 431 and the second pilot control valve 432 carry out oil return pressure release, to be difficult to make rotary drive assembly 33, the first rotation oil 91, the second rotation oil 92, main oil inlet Mouth 11 is formed with oil outlet is completely connected to oil circuit, to hinder the rotary motion of rotary drive assembly 33, i.e. obstruction work fills The rotary motion set.At this point, the first angling cylinder 332 or the second angling cylinder 333 worked as in rotary drive assembly 33 are carried When lotus is impacted, the active force of load impacting acts on the first pilot control valve 431 and the second guide control by slewing directional control valve 331 On valve 432 processed, only when load impacting active force is greater than the unlatching pressure of the first pilot control valve 431 and the second pilot control valve 432 When power, the first pilot control valve 431 or the second pilot control valve 432 can just be opened, i.e. the first angling cylinder 332 and/or second Angling cylinder 333 can be carried out rotary motion just to carry out discharge degree.In the case of this kind, due to 431 He of the first pilot control valve The cracking pressure of second pilot control valve 432 is fixed, and is not opened in the first pilot control valve 431 and the second pilot control valve 432 When, the first angling cylinder 332 and/or the second angling cylinder 333 are difficult to carry out load unloading by the way of revolution, i.e., can be to the Single-revolution oil cylinder 332 and/or the second angling cylinder 333 cause greater impact even to damage, and influence the performance of equipment, reduce The service life of equipment.

In the present embodiment, it is realized by setting revolution pressure reducing valve 82 and first pilot control valve 431 and the second guide is controlled The adjusting of 432 cracking pressure of valve processed, to realize the overload protection to rotary drive assembly 33.Specifically, it turns round in balanced valve 43 It is provided with the second shuttle valve 436, the third oil inlet of the second shuttle valve 436 is connected to the first oil outlet 4351 of the first shuttle valve 435, the 4th oil inlet of two shuttle valves 436 be connected to the oil outlet of revolution pressure reducing valve 82, the second oil outlet 4361 of the second shuttle valve 436 and First guide's hydraulic fluid port 4311 is connected to second guide's hydraulic fluid port 4321, and the oil inlet of revolution pressure reducing valve 82 is connected to pressure oil-source 13.

When rotary drive assembly 33 is in normal operating conditions, revolution pressure reducing valve 82 is closed, and the first of the first shuttle valve 435 Oil inlet or the second oil inlet and the first oil outlet 4351 are connected, and the first oil outlet 4351 and the second oil outlet 4361 are connected, and make High pressure oil part the first shuttle valve 435 and the second shuttle valve 436 in first rotation oil 91 or the second rotation oil 92 act on First guide's hydraulic fluid port 4311 of the first pilot control valve 431 and second guide's hydraulic fluid port 4321 of the second pilot control valve 432, thus The spool for pushing the first pilot control valve 431 and the second pilot control valve 432 makes the first pilot control valve 431 and the second guide Control valve 432 is opened, the revolution movement that rotary drive assembly 33 is worked normally；

When rotary drive assembly 33 is under overload protection mode, the first rotation oil 91 and the second rotation oil 92 are only not It is connected to main oil inlet 11, revolution pressure reducing valve 82 is opened, and pressure oil-source 13 enters the second shuttle valve after revolution pressure reducing valve 82 depressurizes 436 the 4th oil inlet, since oil pressure is greater than oil pressure in third oil inlet in the 4th oil inlet, the 4th oil inlet and second fuel-displaced Mouth 4361 is connected, and the pressure oil by turning round pressure reducing valve 82 enters first guide's hydraulic fluid port 4311 and second by the second shuttle valve 436 In guide's hydraulic fluid port 4321, to the pilot valve of the first pilot control valve 431 and to the pilot valve of the second pilot control valve 432 Apply leading role power.At this point, due to having leading role power in pilot valve, when the first angling cylinder 332 or the second revolution The sum of the revolution load force of the experience of oil cylinder 333 and leading role power are greater than the first pilot control valve 431 and the second guide is controlled The unlatching of the first pilot control valve 431 and the second pilot control valve 432 can be realized in the cracking pressure of valve 432 processed.That is, passing through Setting revolution pressure reducing valve 82 and the second shuttle valve 436, can reduce makes the first pilot control valve 431 and the second pilot control valve 432 The size of revolution load needed for opening, so as to make rotary drive assembly 33 can be real under relatively small load impacting Now revolution unloading carries out overload protection to equipment and rotary drive assembly 33.

In the present embodiment, revolution pressure reducing valve 82 is electromagnetic relief pressure valve, by the electrical current for changing revolution pressure reducing valve 82 Size changes the degree of pressure reduction of revolution pressure reducing valve 82.I.e. in the case that the oil pressure of pressure oil-source 13 keeps certain, pass through change The electrical current size of pressure reducing valve 82 is turned round, the elder generation for acting on the first pilot control valve 431 and the second pilot control valve 432 is changed Active force is led, that is, changing can make rotary drive assembly 33 turn round required revolution magnitude of load.

In this embodiment, it is preferred that revolution pressure reducing valve 82 is proportional pressure-reducing valve, by changing the logical of revolution pressure reducing valve 82 Electric size of current changes the decompression ratio of revolution pressure reducing valve 82, makes to act on the first pilot control valve 431 and the second pilot control The leading role power adjustability of valve 432 is stronger, further enhances the revolution protective value of equipment.

After turning round the unlatching of pressure reducing valve 82, the working oil in rotary drive assembly 33 passes through the first rotation oil 91 or the second Rotation oil 92 carries out oil return pressure release, that is, in the present embodiment, rotary control valve 23 at least has three states: when revolution is controlled When valve 23 processed is in first state, main oil inlet 11 is connected to the first rotation oil 91, oil return opening 12 and the second rotation oil 92 Connection；When rotary control valve 23 is in the second state, main oil inlet 11 is connected to the second rotation oil 92, oil return opening 12 and Single-revolution oil circuit 91 is connected to；When rotary control valve 23 is in the third state, the first rotation oil 91 and the second rotation oil 92 It is connected to oil return opening 12.

When equipment is in normal revolution working condition, by manipulation rotary control valve 23 in first state and second Switching between state and the adjusting by slewing directional control valve 331 regulate and control the first angling cylinder 332 and the second angling cylinder 333 Operating status, that is, regulate and control equipment revolution operating status.When equipment is in overload protection mode, revolution control Valve 23 is preferably in the third state, and revolution pressure reducing valve 82 is opened, and by adjusting the electrical current of revolution pressure reducing valve 82, changes revolution The revolution magnitude of load that the revolution of driving assembly 33 needs, realizes the overload protection to rotary drive assembly 33 and equipment.

In the present embodiment, as shown in figure 5, the first pilot control valve 431 and the second pilot control valve 432 are that guide is overflow Flow valve.

In the present embodiment, rotary control valve 23, lift controil valve 21 and side-sway control valve 22 are in multi-way valve 2 to not With the related plate valve for executing oil cylinder.And in the present embodiment, multi-way valve 2 includes the first multi-way valve and the second multi-way valve, and control is left The rotary control valve 23 that the lift controil valve 21 and control rotary drive assembly 33 that lifting cylinder 31 is run are run is the first multichannel Related plate valve in valve controls the lift controil valve 21 that right lifting cylinder 31 is run and the side-sway control that control side-sway oil cylinder 32 is run Valve 22 processed is the related plate valve in the second multi-way valve.In other embodiments, lift controil valve 21, rotary control valve 23 and side-sway Control valve 22 can also be located in same multi-way valve 2, or can have other distribution forms.It is arranged in multi-way valve 2 for controlling The related plate valve for making different execution units is ordinary skill in the art means, and the present embodiment is no longer repeated.

In this embodiment, it is preferred that multi-way valve 2 be packet type multi-way valve, i.e., in multi-way valve 2 each plate valve respectively with master Oil inlet 11 and oil outlet etc. are connected to.And it is further preferable that in the present embodiment, multi-way valve 2 is load sensibility multi-way valve, energy It is enough that automatic adjusument is carried out according to the working condition of lifting cylinder 31, rotary drive assembly 33 and side-sway oil cylinder 32, improve work The working performance of device.

The present embodiment additionally provides a kind of engineering machinery, including equipment and above-mentioned hydraulic control system.

Example IV

Fig. 6 is the partial schematic diagram of revolution hydraulic control module provided in an embodiment of the present invention.As shown in fig. 6, this implementation Example provide a kind of hydraulic control system, compared with embodiment three, hydraulic control system provided in this embodiment substantially with implementation Example three is identical, and the structure for only turning round balanced valve 43 is different, and the present embodiment no longer repeats structure identical with embodiment three.

As shown in fig. 6, in the present embodiment, the basic composition of revolution balanced valve 43 and revolution balanced valve 43 in embodiment three Form it is identical, include the first pilot control valve 431, the second pilot control valve 432, the first check valve 433, second one-way valve 434, the first shuttle valve 435 and the second shuttle valve 436, the difference is that, in the present embodiment, the first pilot control valve 431 and second Pilot control valve 432 is often-cutting type pilot reversing valve.

In the present embodiment, pilot reversing valve is bi-bit bi-pass hydraulicdirectional control valve, with first state and the second state, When the spool of bi-bit bi-pass hydraulicdirectional control valve be in it is shown in fig. 6 upper when, bi-bit bi-pass hydraulicdirectional control valve is in first state, First hydraulic fluid port of bi-bit bi-pass hydraulicdirectional control valve and the second hydraulic fluid port disconnect, i.e., bi-bit bi-pass hydraulicdirectional control valve disconnects；When with one When the hydraulic oil of constant-pressure flows into from guide's hydraulic fluid port of bi-bit bi-pass hydraulicdirectional control valve and pushes valve core movement, spool is by Fig. 6 institute The upper operation shown is to bottom, the first hydraulic fluid port of bi-bit bi-pass hydraulicdirectional control valve and the conducting of the second hydraulic fluid port, i.e., bi-bit bi-pass is hydraulic Reversal valve conducting.

That is, in the present embodiment, using revolution 82 adjustment effect of pressure reducing valve in the oil pressure on bi-bit bi-pass hydraulicdirectional control valve, from And one timing of oil pressure needed for the valve core movement of bi-bit bi-pass hydraulicdirectional control valve, can adjust makes rotary drive assembly 33 turn round institute The loading moment needed, provides overload protection for rotary drive assembly 33 and equipment.

The present embodiment additionally provides a kind of engineering machinery, including equipment and above-mentioned hydraulic control system.

Embodiment five

Fig. 7 is the partial schematic diagram of revolution hydraulic control module provided in an embodiment of the present invention.As described in Figure 7, this implementation Example provide a kind of hydraulic control system, compared with embodiment three, hydraulic control system provided in this embodiment substantially with implementation The hydraulic control system that example three provides is identical, is only that the structure of rotary drive assembly 33 is different, the present embodiment no longer to implementation The identical structure of example three is repeated.

As shown in fig. 7, rotary drive assembly 33 includes hydraulic motor in revolution hydraulic control module provided in this embodiment 334 and worm speed reducer 335.Two delivery outlets of two actuator ports of hydraulic motor 334 respectively with revolution balanced valve 43 connect It is logical, it is connected to two actuator ports of hydraulic motor 334 with the first rotation oil 91 and the second rotation oil 92 respectively.Hydraulic horse Up to 334 output shaft and the input axis connection of worm speed reducer 335, the output shaft of worm speed reducer 335 is connect with equipment. It is changed into the machine power of the output shaft of hydraulic motor 334 by the oil pressure that hydraulic motor 334 provides variable pump, to drive 335 rotational motion of worm speed reducer.

In the case where rotary drive assembly 33 is in normal mode of operation, by manipulating rotary control valve 23, the first revolution of control Connection relationship between oil circuit 91 and the second rotation oil 92 and main oil outlet 11 and oil return opening 12, and then control hydraulic motor 334 positive and negative rotation controls the positive and negative rotation campaign of worm speed reducer 335, to the equipment connecting with worm speed reducer 335 Rotary motion be adjusted.

When equipment encounters larger external load function, external applied load applies load-reaction torque to equipment and will Load-reaction torque is transferred to the first guide in the first rotation oil 91 by worm speed reducer 335 and hydraulic motor 334 In control valve 431 or in the second pilot control valve 432 for being transferred in the second rotation oil 92.When load-reaction torque is greater than When pilot valve opens required pressure in first pilot control valve 431 or the second pilot control valve 432, the first rotation oil 91 Or second rotation oil 92 be connected, the working oil in hydraulic motor 334 flows out corresponding actuator port and carries out pressure release buffering, and makes Hydraulic motor 334, worm speed reducer 335 and equipment revolution carry out load unloading, reduce shock loading to equipment, whirlpool Take turns the impact of speed reducer 335 and hydraulic motor 334.

That is, in the present embodiment, by setting revolution 82 adjustment effect of pressure reducing valve in the pilot pressure on pilot control valve, Adjusting makes equipment, worm speed reducer 335 and the hydraulic motor 334 passively required external load function torque of revolution, realizes To the reasonable overload protection of equipment and rotary drive assembly 33, avoid external load excessive to rotary drive assembly 33 and/ Or equipment damages.

It is understood that the revolution balanced valve 43 in the present embodiment can be using the revolution balanced valve 43 in embodiment three Structure, can also be using the structure of the revolution balanced valve 43 in example IV.

The present embodiment additionally provides a kind of engineering machinery, including equipment and above-mentioned hydraulic control system.

Embodiment six

Fig. 8 is the schematic diagram of hydraulic control system provided in this embodiment, and Fig. 9 is the hydraulic schematic diagram of multi-way valve in Fig. 8. As shown in FIG. 8 and 9, a kind of hydraulic control system is present embodiments provided, compared with the hydraulic control system that embodiment three provides, Hydraulic control system provided in this embodiment and the hydraulic control system that embodiment three provides are essentially identical, only in multi-way valve 2 It is had differences in setting, the present embodiment no longer repeats structure identical with embodiment three.

In the present embodiment, multi-way valve 2 is integral multitandem valve, i.e., deposits between two neighboring control plate valve in multi-way valve 2 In the interface being connected.The revolution of the lift controil valve 21 and driving rotary drive assembly 33 that drive left lifting cylinder movement controls Valve 23 is in same multi-way valve 2, and rotary control valve 23 and lift controil valve 21 are three six-way transfer valves, and three six logical to change Into valve there is one connection input port and to join delivery outlet altogether altogether, the total input port of three six-way transfer valves and adjacent three six The total delivery outlet connection of logical reversal valve, and the total input port of one of them three six-way transfer valve and main oil outlet 11 connect It is logical.When each three six-way transfer valves are in middle position, the total input port of each three six-way transfer valves and altogether connection output Mouth is both turned on, i.e., at this point, each three six-way valves are connected to main oil outlet 11.Integral multitandem valve 2 is set as this field Conventional technical means, the present embodiment no longer repeated.

In the present embodiment, multi-way valve 2 can be with common electric proportional multi-way valve shown in Fig. 9, or shown in Fig. 4 Load feedback type multi-way valve, and common electric proportional multi-way valve and load feedback type multi-way valve are two kinds of common multichannels of this field 2 form of valve, the present embodiment are no longer repeated.

The present embodiment additionally provides a kind of engineering machinery, including equipment and above-mentioned hydraulic control system.

Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation, It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.

Claims (17)

1. a kind of hydraulic control system comprising variable pump, hydraulic oil container, lift controil valve (21) and lifting cylinder (31), institute State two hydraulic fluid ports of lifting cylinder (31) by lift controil valve (21) selectively with the variable pump or the hydraulic oil container Connection, which is characterized in that the rod chamber of the lifting cylinder (31) selectively communicates with the hydraulic oil container, the lifting cylinder (31) rodless cavity selectively communicates with pressure oil-source (13) by going up and down pressure reducing valve (81).

2. hydraulic control system according to claim 1, which is characterized in that the hydraulic control system further includes adjusting to change To valve (5), the adjustable change valve (5) includes first port (51), second port (52), third port (53) and the 4th port (54), the first port (51) is connected to the hydraulic oil container, and the second port (52) passes through the lifting pressure reducing valve (81) it is connected to the pressure oil-source (13), the third port (53) is connected to the rod chamber of the lifting cylinder (31), institute The 4th port (54) is stated to be connected to the rodless cavity of the lifting cylinder (31).

3. hydraulic control system according to claim 2, which is characterized in that the adjustable change valve (5) has the first shape State and the second state, when the adjustable change valve (5) is in the first state, the adjustable change valve (5) is disconnected；Work as institute When stating adjustable change valve (5) and being in second state, the first port (51) is connected to the third port (53), described Second port (52) is connected to the 4th port (54).

4. hydraulic control system according to claim 3, which is characterized in that the adjustable change valve (5) also has third State, when the adjustable change valve (5) is in the third state, the third port (53) and the 4th port (54) It is connected to the first port (51).

5. hydraulic control system according to claim 1, which is characterized in that the lifting cylinder (31) includes being arranged side by side Left lifting cylinder and right lifting cylinder, the rod chamber of the rod chamber of the left lifting cylinder and the right lifting cylinder can select Selecting property it is connected to the hydraulic oil container, the rodless cavity of the rodless cavity of the left lifting cylinder and the right lifting cylinder passes through respectively One lifting pressure reducing valve (81) is selectively connected to the pressure oil-source (13).

6. hydraulic control system according to claim 2, which is characterized in that the adjustable change valve (5) is 3-position 4-way Solenoid directional control valve.

7. hydraulic control system according to claim 1, which is characterized in that the pressure oil-source (13) is the hydraulic control The pressure oil in oil circuit is controlled in system processed.

8. hydraulic control system according to claim 1, which is characterized in that the lifting pressure reducing valve (81) is ratio decompression Valve.

9. hydraulic control system according to claim 1-8, which is characterized in that the nothing of the lifting cylinder (31) Rod cavity is connected to by first switch valve (61) with the first accumulator (71).

10. hydraulic control system according to claim 1-8, which is characterized in that the hydraulic control system is also Including side-sway control valve (22) and side-sway oil cylinder (32), the variable pump and the hydraulic oil container pass through the side-sway control valve (22) it is selectively connected to the rod chamber of the side-sway oil cylinder (32) and rodless cavity.

11. hydraulic control system according to claim 10, which is characterized in that the rodless cavity of the side-sway oil cylinder (32) is logical Second switch valve (62) is crossed to be connected to the second accumulator (72), and/or, the rod chamber of the side-sway oil cylinder (32) is opened by third Valve (63) are closed to be connected to third accumulator (73).

12. hydraulic control system according to claim 11, which is characterized in that the second switch valve (62) and/or institute Stating third switch valve (63) is often-cutting type two-position two-way electromagnetic directional valve.

13. hydraulic control system according to claim 10, which is characterized in that the side-sway control valve (22) and the liter Dropping control valve (21) is the control plate valve in multi-way valve (2), and the multi-way valve (2) is load sensibility multi-way valve or described more Road valve is electric proportional multi-way valve.

14. hydraulic control system according to claim 1-8, which is characterized in that the hydraulic control system is also Including rotary control valve (23) and rotary drive assembly (33), two hydraulic fluid ports of the rotary drive assembly (33) pass through respectively Single-revolution oil circuit (91) and the second rotation oil (92) are connect with two delivery outlets of the rotary control valve (23), the revolution Two input ports of control valve (23) are connected to the variable pump and the hydraulic oil container respectively.

15. hydraulic control system according to claim 14, which is characterized in that be arranged on first rotation oil (91) Have the first pilot control valve (431), is provided with the second pilot control valve (432) on second rotation oil (92), described Guide's hydraulic fluid port of one pilot control valve (431) and second pilot control valve (432) passes through revolution pressure reducing valve (82) and institute State pressure oil-source (13) connection.

16. a kind of engineering machinery, including equipment, which is characterized in that further include as claim 1-15 is described in any item Hydraulic control system, the hydraulic control system control the equipment.

17. engineering machinery according to claim 16, which is characterized in that the engineering machinery is land leveller, the work Device is perching knife.