CN203670318U - Electro-hydraulic control valve assembly and electro-hydraulic control loop - Google Patents
Electro-hydraulic control valve assembly and electro-hydraulic control loop Download PDFInfo
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- CN203670318U CN203670318U CN201420027753.7U CN201420027753U CN203670318U CN 203670318 U CN203670318 U CN 203670318U CN 201420027753 U CN201420027753 U CN 201420027753U CN 203670318 U CN203670318 U CN 203670318U
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- 239000003381 stabilizer Substances 0.000 claims abstract description 89
- 239000012530 fluid Substances 0.000 claims description 83
- 239000000945 filler Substances 0.000 claims description 30
- 239000002828 fuel tank Substances 0.000 claims description 7
- 230000001502 supplementing effect Effects 0.000 abstract 3
- 239000003921 oil Substances 0.000 description 187
- 239000010720 hydraulic oil Substances 0.000 description 22
- 206010039740 Screaming Diseases 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses an electrohydraulic control valve subassembly and electrohydraulic control valve return circuit. The electro-hydraulic control valve assembly comprises a first reversing valve, a flow stabilizer and an oil supplementing valve, wherein the first reversing valve comprises a valve body and a bottom plate, an oil inlet of the bottom plate, an oil return port, a first working oil port and a second working oil port are respectively communicated with an oil inlet cavity in the valve body, a first working oil cavity and a second working oil cavity, the flow stabilizer and the oil supplementing valve are embedded on the bottom plate, the oil inlet of the flow stabilizer is communicated with the oil return cavity and the oil return port of the first reversing valve, and the oil outlet of the oil supplementing valve is communicated with the second working oil cavity and the second working oil port of the first reversing valve. Through the mode, the volume of the hydraulic medium flowing through the flow stabilizer can be controlled to be equal to the reduced volume of the central cavity of the first oil cylinder through the flow stabilizer, so that in the hydraulic machinery with double oil cylinders or multiple oil cylinders, the first oil cylinder and the second oil cylinder move independently, and the first oil cylinder and the second oil cylinder are prevented from moving simultaneously.
Description
Technical field
The utility model relates to technical field of hydraulic, particularly relates to a kind of electrichydraulic control valve assembly and electrichydraulic control loop.
Background technique
In large tonnage hydraulic mobile crane, in order to ensure the sling height of hoist, telescopic boom adopts two-stage telescopic oil cylinder conventionally.Oil cylinder I is divided into rod chamber, rodless cavity and center cavity by the piston rod of oil cylinder I, and oil cylinder II is divided into rod chamber and rodless cavity by the piston rod of oil cylinder II.Wherein the rod chamber fluid of the rod chamber of oil cylinder I and oil cylinder II is communicated with, and the center cavity of the rodless cavity of oil cylinder II and oil cylinder I is communicated with by equilibrium valve fluid.Further, in order to control neatly stretching out and retracting of arbitrary oil cylinder, conventionally adopt electrichydraulic control valve assembly to realize two oil cylinders are switched mutually.
Existing electro-hydraulic reversing valve assembly comprises back pressure valve, is connected with the center cavity of oil cylinder I.Back pressure valve need to be preset fixing back pressure value, and in the time that the flow pressure of the hydraulic medium of center cavity output is greater than this back pressure value, hydraulic medium is by the defeated fuel tank of getting back to of back pressure valve.But, if this back pressure value arranges too much, in the time that the piston rod of oil cylinder I is retracted, the hydraulic medium of exporting much smaller than center cavity by the hydraulic medium of back pressure valve, cause there is pressure difference between oil cylinder I and oil cylinder II, the hydraulic medium of center cavity easily flows into the rodless cavity of oil cylinder II, causes the piston rod of oil cylinder II to stretch out; If this back pressure value arranges too smallly, in the time that the piston rod of oil cylinder I is retracted, the hydraulic medium by back pressure valve is more than the hydraulic medium of center cavity, and the hydraulic medium output of the rodless cavity of oil cylinder II, causes the piston rod of oil cylinder II synchronously to be retracted.Be that oil cylinder II easily follows oil cylinder I motion.On the other hand, back pressure valve bore is less, and in the time that hydraulic medium flows through back pressure valve, the vibration frequency that back pressure valve produces is high, and easily generation is screamed with the resonance of main valve overload valve.
Model utility content
The technical problem that the utility model mainly solves is to provide a kind of electrichydraulic control valve assembly and electrichydraulic control loop, can be in the hydraulic machinery of two oil cylinders or Multi-cylinder, and prevent that oil cylinder from moving simultaneously, and can prevent overload valve resonance and produce and scream.
For solving the problems of the technologies described above, the technological scheme that the utility model adopts is: a kind of electrichydraulic control valve assembly is provided, this electrichydraulic control valve assembly comprises the first selector valve, flow stabilizer and Fill valve, the first selector valve comprises valve body and is fixed on the base plate of valve body below, the opposing side of base plate and valve body is provided with filler opening, return opening, the first actuator port and the second actuator port, filler opening, the first actuator port and the second actuator port respectively with the valve body of the first selector valve in oil suction chamber, the first working oil chamber, the second working oil chamber fluid is communicated with, flow stabilizer and Fill valve are embedded on base plate, the filler opening of flow stabilizer is communicated with oil back chamber and the return opening fluid of the first selector valve, the oil outlet of Fill valve is communicated with the second working oil chamber and the second actuator port fluid of the first selector valve.
Wherein, the filler opening of Fill valve is communicated with the oil outlet fluid of flow stabilizer.
Wherein, the filler opening place of the contiguous flow stabilizer of flow stabilizer is provided with hydraulic connectors, and hydraulic connectors is connected the filler opening of flow stabilizer with the return opening of the first selector valve.
Wherein, flow stabilizer comprises valve pocket and is located at spool and the elastic component within valve pocket, one termination valve pocket of elastic component, another termination spool of elastic component, on spool, be provided with variable passage, one end of variable passage is communicated with the filler opening fluid of flow stabilizer, and the other end of variable passage changes the size being communicated with the return opening fluid of flow stabilizer by the extending amount of elastic component.
For solving the problems of the technologies described above, another technological scheme that the utility model adopts is: a kind of electrichydraulic control loop is provided, this electrichydraulic control loop comprises the first oil cylinder, the second oil cylinder, electrichydraulic control valve assembly, the first equilibrium valve, the second equilibrium valve and main valve, wherein, the first oil cylinder comprises the first piston and the first piston bar that are formed in the first cylinder body, the second oil cylinder comprises the second piston and the second piston rod that are formed in the second cylinder body, the first cylinder body is divided into the first rodless cavity by first piston and first piston bar, the first rod chamber and center cavity, the second cylinder body is divided into the second rodless cavity and the second rod chamber by the second piston, wherein, the second rodless cavity is communicated with center cavity fluid by the first equilibrium valve, the second rod chamber and the first rod chamber fluid are communicated with, wherein: electrichydraulic control valve assembly is above-mentioned electrichydraulic control valve assembly, the first actuator port of the first selector valve is communicated with the first rodless cavity fluid by the second equilibrium valve, the second actuator port of the first selector valve is communicated with center cavity fluid, the filler opening of the first selector valve is communicated with the first actuator port fluid of main valve, the return opening of the first selector valve is communicated with the filler opening fluid of flow stabilizer, and the oil outlet of flow stabilizer is communicated with the return opening fluid of main valve.
Wherein, the internal diameter of the filler opening of flow stabilizer is greater than the internal diameter of the oil outlet of flow stabilizer.
Wherein, the flow of flow stabilizer is 5L/min.
Wherein, the first selector valve is three position four-way directional control valve, electrichydraulic control valve assembly also comprises the second selector valve, the filler opening of the second selector valve and return opening are connected respectively the first control end and second control end of three position four-way directional control valve, when first piston bar stretches out, when retraction and the second piston rod are retracted, the first actuator port of the second selector valve control three position four-way directional control valve and filler opening fluid are communicated with, the second actuator port of three position four-way directional control valve and return opening fluid are communicated with, in the time that the second piston rod stretches out, the first actuator port of the second selector valve control three position four-way directional control valve and return opening fluid are communicated with, the second actuator port of three position four-way directional control valve and filler opening fluid are communicated with.
Wherein, the filler opening of Fill valve and the oil outlet of flow stabilizer are all communicated with the return opening fluid of main valve, and the second actuator port of main valve is communicated with the first rod chamber fluid of the first oil cylinder, and the oil outlet of Fill valve is communicated with center cavity fluid.
Wherein, electrichydraulic control loop also comprises back pressure valve, and the return opening of main valve is further communicated with the first hydraulic fluid port fluid of back pressure valve, and the second hydraulic fluid port of back pressure valve is communicated with fuel tank fluid.
The beneficial effects of the utility model are: be different from the situation of prior art, electrichydraulic control valve assembly of the present utility model comprises the first selector valve and flow stabilizer, and wherein, the filler opening of flow stabilizer is communicated with oil back chamber and the return opening of the first selector valve.Therefore, the volume that can control the hydraulic medium that flows through flow stabilizer by flow stabilizer equals the volume of the hydraulic medium of the return opening that flows through the first selector valve, when by this electro-hydraulic control valve component application in the hydraulic machinery of two oil cylinders or Multi-cylinder, the volume that can control the hydraulic medium that flows through flow stabilizer by flow stabilizer equals the volume that the center cavity of the first oil cylinder reduces, making the motion between oil cylinder and oil cylinder is independently, prevents that oil cylinder from moving simultaneously.
Brief description of the drawings
Fig. 1 is the structural representation in the electrichydraulic control loop that provides of the utility model embodiment;
Fig. 2 is the structural representation of the electrichydraulic control valve assembly that provides of the utility model embodiment;
Fig. 3 is the structural representation of the flow stabilizer that provides of the utility model embodiment.
Embodiment
Refer to Fig. 1, Fig. 1 is the structural representation in the electrichydraulic control loop that provides of the utility model embodiment.As shown in Figure 1, the electro-hydraulic control valve loop 10 of the present embodiment comprises oil cylinder 11, electrichydraulic control valve assembly 12, the first equilibrium valve 13, the second equilibrium valve 14 and main valve 15.
Wherein, oil cylinder 11 comprises that the first oil cylinder 110, the first oil cylinders 110 comprise the first piston 112 and the first piston bar 113 that are formed in the first cylinder body 111.The first cylinder body 111 is divided into the first rodless cavity 114, the first rod chamber 115 and center cavity 116 by first piston 112 and first piston bar 113.Particularly, first piston 112 and first piston bar 113 are hollow-core construction, and fluid connection, form center cavity 116.The interior setting of the first cylinder body 111 is communicated with oil circuit 117, and one end of connection oil circuit 117 is arranged on a side of the first cylinder body 111 and penetrates the sidewall of the first cylinder body 111, and the other end that is communicated with oil circuit 117 is communicated with center cavity 116 fluids.
Oil cylinder 11 also comprises that the second oil cylinder 220, the second oil cylinders 220 comprise the second piston 222 and the second piston rod 223 being formed in the second cylinder body 221.The second cylinder body 221 is divided into the second rodless cavity 224 and the second rod chamber 225 by the second piston 222.
In the present embodiment, the second rodless cavity 224 of the second oil cylinder 220 is communicated with center cavity 116 fluids of the first oil cylinder 110 by the first equilibrium valve 13 and connection oil circuit 117, and the first rod chamber 115 fluids of the second rod chamber 225 of the second oil cylinder 220 and the first oil cylinder 110 are communicated with.
In the present embodiment, electrichydraulic control valve assembly 12 is for controlling the first oil cylinder 110 and the second oil cylinder 220 is worked.Wherein, electrichydraulic control valve assembly 12 comprises the first selector valve 121 and flow stabilizer 122.Wherein, the first actuator port a of the first selector valve 121 is communicated with the first rodless cavity 114 fluids of the first oil cylinder 110 by the second equilibrium valve 14, the second actuator port b of the first selector valve 121 is communicated with center cavity 116 fluids of the first oil cylinder 110, the oil inlet P 1 of the first selector valve 121 is communicated with the first actuator port B fluid of main valve 15, the oil return inlet T 1 of the first selector valve 121 is communicated with oil inlet P 2 fluids of flow stabilizer 122, and the oil outlet T2 of flow stabilizer 122 is communicated with oil return inlet T 0 fluid of main valve 15.
See also Fig. 2, the first selector valve 121 specifically comprises end cap 1211, valve rod 1212, valve body 1213 and is fixed on the base plate 1214 of valve body 1213 belows.Wherein, the opposing side of base plate 1214 and valve body 1213 is provided with oil inlet P 1, oil return inlet T 1, the first actuator port a and the second actuator port b.Oil inlet P 1, the first actuator port a and the second actuator port b are communicated with oil suction chamber p ', the first working oil chamber a ', the second working oil chamber b ' in the valve body 1211 of the first selector valve 121 respectively.Flow stabilizer 122 is embedded at one end of base plate 1214.The oil inlet P 2 of flow stabilizer 122 is communicated with oil back chamber T ' and oil return inlet T 1 fluid of the first selector valve 121.
See also Fig. 3, flow stabilizer 122 comprises valve pocket 123 and is located at spool 124 and the elastic component 125 within valve pocket 123, one termination valve pocket 123 of elastic component 125, another termination spool 124 of elastic component 125, on spool 124, be provided with variable passage 126, one end O1 of variable passage 126 is communicated with oil inlet P 2 fluids of flow stabilizer 122, and the other end O2 of variable passage 126 changes the size being communicated with the oil outlet T2 fluid of flow stabilizer 122 by the extending amount of elastic component 125.Particularly, the internal diameter of one end O1 of variable passage 126 is less than the internal diameter of the oil inlet P 2 of flow stabilizer 122.When there is no hydraulic medium, for example, when hydraulic oil flows into variable passage 126 from the oil inlet P 2 of flow stabilizer 122, now in a state of nature, the oil outlet T2 perfect fluid of the other end O2 of variable passage 126 and flow stabilizer 122 is communicated with spool 124.When hydraulic oil is from the oil inlet P 2 of flow stabilizer 122 enters, because one end O1 of variable passage 126 can not transfer in time, produce pressure, thereby cause the stressed retraction of elastic component 125 to pull spool 124 to move, make spool 124 block the oil outlet T2 of a part of flow stabilizer 122, thereby changed the size of the bore that the other end O2 of variable passage 126 and the oil outlet T2 of flow stabilizer 122 be communicated with.Therefore, can carry out by changing the size of the bore that the other end O2 of variable passage 126 and the oil outlet T2 of flow stabilizer 122 be communicated with the volume of the hydraulic oil that adjust flux stabilizer 126 exports.
In the present embodiment, in the time that the first piston bar 113 of the first oil cylinder 110 is retracted, the volume that can control the hydraulic medium that flows through flow stabilizer 122 by the flow stabilizer 122 in electrichydraulic control valve assembly 12 equals the volume that the center cavity 116 of the first oil cylinder 110 reduces, prevent that the motion artifacts of the first oil cylinder 110 is to the motion of the second oil cylinder 220, thereby prevent that the second oil cylinder 220 from following the first oil cylinder 110 and moving simultaneously.
Optionally, the electrichydraulic control valve assembly 12 of the present embodiment also comprises Fill valve 129, referring again to Fig. 2, Fill valve 129 is embedded at the other end of base plate 1214, the oil outlet T3 of Fill valve 129 is communicated with the second working oil chamber b ' and the second actuator port b fluid of the first selector valve 121, and the oil inlet P 3 of Fill valve 129 is communicated with oil return inlet T 2 fluids of flow stabilizer 122.
Refer to Fig. 1, in electrichydraulic control valve assembly 12 outsides, the oil inlet P 3 of Fill valve 129 and the oil outlet T2 of flow stabilizer 122 are all communicated with oil return inlet T 0 fluid of main valve 15, and the oil outlet T3 of Fill valve 129 is communicated with center cavity 116 fluids.
In the present embodiment, Fill valve 129 is unidirectional Fill valve.
Optionally, the internal diameter of the oil inlet P 2 of flow stabilizer 122 is greater than the internal diameter of the oil outlet T2 of flow stabilizer 122.
Optionally, oil inlet P 2 places of flow stabilizer 122 contiguous flow stabilizers 122 are provided with hydraulic connectors 127, and hydraulic connectors 127 couples together the oil return inlet T 1 of the oil inlet P of flow stabilizer 122 2 and the first selector valve 121.In the present embodiment, link 127 is screw plug, and in other embodiments, link 127 can also have for other element of linkage function.
Optionally, elastic component 125 has the element of elastic force for spring or other.
Optionally, the first selector valve 121 is pilot operated directional control valve, and is three position four-way directional control valve.Referring again to Fig. 2, valve rod 1212 can move between three positions, and the first selector valve 121 has four hydraulic fluid ports.
Optionally, electrichydraulic control valve assembly 12 also comprises the second selector valve 128, and please also refer to Fig. 1 and Fig. 2, the oil inlet P 5 of the second selector valve 128 and oil outlet T5 are connected respectively the first control end X and the second control end Y of the first selector valve 121.The oil inlet P 5 of the second selector valve 128 and oil outlet T5 are communicated with for the fluid of controlling between the first actuator port a, the second actuator port b, oil inlet P 1 and the oil return inlet T 1 of the first selector valve 121.Particularly, when first piston bar 113 stretches out, retracts and when the second piston rod 223 is retracted, the first actuator port a and oil inlet P 1 fluid that the oil inlet P 5 of the second selector valve 128 and oil outlet T5 control the first selector valve 121 are communicated with, and the second actuator port b of the first selector valve 121 and oil return inlet T 1 fluid are communicated with; In the time that the second piston rod 223 stretches out, the first actuator port a and oil return inlet T 1 fluid that the oil inlet P 5 of the second selector valve 128 and oil outlet T5 control the first selector valve 121 are communicated with, and the second actuator port b of the first selector valve 121 and oil inlet P 1 fluid are communicated with.
Wherein, the second selector valve 128 is preferably solenoid valve.
Alternatively, the first equilibrium valve 13 and the second equilibrium valve 14 include one-way valve and relief valve, in the time that first piston bar 113 or the second piston rod 223 stretch out, the one-way valve opens of corresponding equilibrium valve, relief valve is inoperative, in the time that first piston bar 113 or the second piston rod 223 are retracted, the closed check valve of corresponding equilibrium valve, relief valve starts overflow.
Optionally, electrichydraulic control loop 10 also comprises back pressure valve 16, and the oil return inlet T 0 of main valve 15 is communicated with oil inlet P 4 fluids of back pressure valve 16, and the oil return inlet T 4 of back pressure valve 16 is communicated with fuel tank 200 fluids.
Optionally, the second actuator port A of main valve 15 and rod chamber 115 fluids of the first oil cylinder 110 are communicated with.In the present embodiment, the first actuator port B of main valve 15 and the second actuator port A connect one respectively can selected cell (not shown), such as selector valve etc., and this selected cell further connects respectively fuel tank 200 and is communicated with hydraulic oil source fluid by oil hydraulic pump.
In the present embodiment, oil cylinder 11 can also be more than two, when oil cylinder 11 is during more than two, correspondingly increases the quantity of the first selector valve 121 and the second selector valve 128, and its annexation as mentioned before.
To specifically introduce the working principle in electrichydraulic control of the present utility model loop 10 below:
Electrichydraulic control valve assembly 12 is for controlling the first oil cylinder 110 and the second oil cylinder 220 is worked, and main valve 15 is for controlling oil cylinder working state particularly, and the piston rod of controlling oil cylinder stretches out or retracts.
Particularly, in the time that the first piston bar 113 of need the first oil cylinder 110 stretches out, it is large that the first rodless cavity 114 of the first oil cylinder 110 and the volume of center cavity 116 become, the smaller volume of the first rod chamber 115.The first actuator port a of control first selector valve 121 of the second selector valve 128 and oil inlet P 1 fluid are communicated with, and the second actuator port b and oil return inlet T 1 fluid are communicated with.Main valve 15 provides such as hydraulic oil of hydraulic medium by the first actuator port B, after the oil inlet P 1 of hydraulic oil by the first selector valve 121 and the first actuator port a, further by the second equilibrium valve 14, and then enters the first rodless cavity 114 of the first oil cylinder 110.The first rod chamber 115 of the first oil cylinder 110 is by the second actuator port A emptying of main valve 15.The center cavity 116 of the first oil cylinder 100 is by Fill valve 129 repairings.
Wherein, the oil inlet P 4 of back pressure valve 16 provides back pressure to the oil inlet P 3 of Fill valve 129 and the oil outlet T2 of flow stabilizer 122, ensure that Fill valve 129 carries out repairing smoothly, prevent that the hydraulic oil of center cavity 116 from falling down because conducting oneself with dignity, thereby prevent that creeping phenomenon from appearring in first piston bar 113.Further; because 16 need of back pressure valve provide to the oil inlet P 3 of Fill valve 129 and the oil outlet T2 of flow stabilizer 122 back pressure are provided; this back pressure is less; therefore; the bore of back pressure valve 16 designs greatlyr conventionally; vibration frequency conventionally can be less, and the vibration frequency of main valve 15 conventionally can be larger, can solve thus the problem of screaming because of the overload valve of back pressure valve and main valve overload valve resonance generation in prior art.
When the first piston bar 113 of controlling the first oil cylinder 110 when need is retracted, the first rodless cavity 114 of the first oil cylinder 110 and the smaller volume of center cavity 116, it is large that the volume of the first rod chamber 115 becomes.The first actuator port a that the second selector valve 128 is controlled the first selector valve 121 is communicated with oil inlet P 1 fluid, and the second actuator port b of the first selector valve 121 is communicated with oil outlet T1 fluid.Now, the second equilibrium valve 14 produces displacement, and its relief valve works.
The hydraulic oil of the first rodless cavity 114 of the first oil cylinder 110 is further got back to fuel tank 200 by the first actuator port a of the first selector valve 121 and the first actuator port B of oil inlet P 1 and main valve 15 by the second equilibrium valve 14 after being shifted is rear.The second actuator port A of main valve 15 provides hydraulic oil to the first rod chamber 115 of the first oil cylinder 110.The second actuator port b of the hydraulic oil of center cavity 116 by the first selector valve 121 and oil return inlet T 1 is rear further gets back to fuel tank 200 by flow stabilizer 122.
Wherein, the volume of the hydraulic oil of flow stabilizer 122 controllable flow inflow-rate of water turbine stabilizers 122 equals the volume that center cavity 116 reduces, and the hydraulic oil that center cavity 116 is exported can output from flow stabilizer 122 in real time.
Particularly, the stretching out and retract can not be with to carry and stretch out and retract, therefore fast retractile normally in the time that oil cylinder is retracted of oil cylinder.The size of the volume that the time while therefore, retraction according to the first piston bar 113 of the first oil cylinder 110 and center cavity 116 reduce arranges the flow velocity of flow stabilizer 122.The flow velocity of the flow stabilizer 122 size, the size of internal diameter and the elasticity coefficient of elastic component 125 of oil outlet T2 of the internal diameter of one end O1 of size, the variable passage 126 of the internal diameter of the oil inlet P 2 by flow stabilizer 122 arranges.
For example, the first piston bar 113 of the first oil cylinder 110 completes retraction in 1 minute (min) left and right.And in the time that the first piston bar 113 of the first oil cylinder 110 is retracted, the volume that center cavity 116 reduces is for example 5L.The flow velocity that sets in advance flow stabilizer 122 is 5L/min, makes the volume of the hydraulic oil that flows through flow stabilizer 122 equal the volume that center cavity 116 reduces.And then prevent that the hydraulic oil that center cavity 116 is exported from can not export and run toward the second rodless cavity 224 of the second oil cylinder 220 by the first equilibrium valve 13 producing hydraulic pressure from flow stabilizer 122 in time, or the hydraulic oil of the second rodless cavity 224 of the second oil cylinder 220 runs toward center cavity 116.Therefore, can avoid the first oil cylinder 110 and the second oil cylinder 220 to move simultaneously.
It should be noted that, in practical operation, the volume that the hydraulic oil of flow stabilizer 122 is flow through in very difficult control just equals the volume that center cavity 116 reduces, and therefore, the volume that flow stabilizer 122 also can be set to the hydraulic oil that flows through flow stabilizer 122 is less than the volume that center cavity 116 reduces.The volume of hydraulic oil and the difference of the volume that center cavity 116 reduces that flow through flow stabilizer 122 must be less than a default value, and this default value is specifically determined by factors such as the elasticity coefficient of elastic component 125 and the back pressure values of the first equilibrium valve 13 in design.
When the second piston rod 223 of controlling the second oil cylinder 220 when need stretches out, it is large that the volume of the second rodless cavity 224 of the second oil cylinder 220 becomes, the smaller volume of the second rod chamber 225.The second actuator port b and oil inlet P 1 fluid that the second selector valve 128 is controlled the first selector valve 121 are communicated with, and the first actuator port a and oil return inlet T 1 fluid are communicated with.Main valve 15 provides hydraulic oil by the first actuator port B, enters the second rodless cavity 224 that enters the second oil cylinder 220 after center cavity 116 by the first equilibrium valve 13.The second rod chamber 225 of the second oil cylinder 220 is by the first rod chamber 115 emptyings of the first oil cylinder 110.
When the second piston rod 223 of controlling the second oil cylinder 220 when need is retracted, the smaller volume of the second rodless cavity 224 of the second oil cylinder 220, it is large that the volume of the second rod chamber 225 becomes.The second actuator port b and oil return inlet T 1 fluid that the second selector valve 128 is controlled the first selector valve 121 are communicated with, and the first actuator port a and oil inlet P 1 fluid are communicated with.Now, the first equilibrium valve 13 is shifted, and its relief valve works.Main valve 15 provides hydraulic oil to the first rod chamber 115 of the first oil cylinder 110 by the second actuator port A, further flow to the second rod chamber 225 of the second oil cylinder 220.First equilibrium valve 13 of the hydraulic oil of the second rodless cavity 224 of the second oil cylinder 220 after by displacement is transported to center cavity 116, and further the second actuator port b by the first selector valve 121 and oil return inlet T 1 and flow stabilizer 122 are exported.
In sum, when the hydraulic control circuit 10 of model utility is retracted at the first piston bar 113 of the first oil cylinder 110, the volume that can control the hydraulic medium that flows through flow stabilizer 122 by the flow stabilizer 122 in electrichydraulic control valve assembly 12 equals the volume that the center cavity 116 of the first oil cylinder 110 reduces, prevent that the motion artifacts of the first oil cylinder 110 is to the motion of the second oil cylinder 220, thereby prevent that the second oil cylinder 220 from following the first oil cylinder 110 and moving simultaneously.
On the other hand, provide back pressure by back pressure valve 16 to the oil inlet P 3 of Fill valve 129 and the oil outlet T2 of flow stabilizer 122, ensure that Fill valve 129 carries out repairing smoothly, prevent that the hydraulic oil of center cavity 116 from falling down because conducting oneself with dignity, thereby prevent that creeping phenomenon from appearring in first piston bar 113.Further, solved the problem of screaming because of the overload valve of back pressure valve and main valve overload valve resonance generation in prior art.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. an electrichydraulic control valve assembly, it is characterized in that, comprise the first selector valve (121), flow stabilizer (122) and Fill valve (129), described the first selector valve (121) comprises valve body (1213) and is fixed on the base plate (1214) of described valve body (1213) below, the opposing side of described base plate (1214) and described valve body (1213) is provided with filler opening (P1), return opening (T1), the first actuator port (a) and the second actuator port (b), described filler opening (P1), described the first actuator port (a) and described the second actuator port (b) respectively with the valve body (1211) of described the first selector valve (121) in oil suction chamber (p '), the first working oil chamber (a '), the second working oil chamber (b ') fluid connection, described flow stabilizer (122) and described Fill valve (129) are embedded on described base plate (1214), the filler opening (P2) of described flow stabilizer (122) and the oil back chamber of described the first selector valve (121) (T ') and described return opening (T1) fluid are communicated with, the oil outlet (T3) of described Fill valve (129) and the second working oil chamber of described the first selector valve (121) (b ') and described the second actuator port (b) fluid are communicated with.
2. electrichydraulic control valve assembly according to claim 1, is characterized in that: the filler opening (P3) of described Fill valve (129) is communicated with oil outlet (T2) fluid of described flow stabilizer (122).
3. electrichydraulic control valve assembly according to claim 1, it is characterized in that: the filler opening (P2) of the contiguous described flow stabilizer of described flow stabilizer (122) (122) locates to be provided with hydraulic connectors (127), and described hydraulic connectors (127) is connected the filler opening of described flow stabilizer (122) (P2) with the return opening (T1) of described the first selector valve (121).
4. electrichydraulic control valve assembly according to claim 1, it is characterized in that: described flow stabilizer (122) comprises valve pocket (123) and is located at spool (124) and the elastic component (125) within described valve pocket (123), valve pocket (123) described in one termination of described elastic component (125), spool (124) described in another termination of described elastic component (125), on described spool (124), be provided with variable passage (126), one end (O1) of described variable passage (126) is communicated with filler opening (P2) fluid of described flow stabilizer (122), the other end (O2) of described variable passage (126) changes the size being communicated with return opening (T2) fluid of described flow stabilizer (122) by the extending amount of described elastic component (125).
5. an electrichydraulic control loop, described electrichydraulic control loop comprises the first oil cylinder (110), the second oil cylinder (220), electrichydraulic control valve assembly (12), the first equilibrium valve (13), the second equilibrium valve (14) and main valve (15), wherein, described the first oil cylinder (110) comprises the first piston (112) and the first piston bar (113) that are formed in the first cylinder body (111), the second oil cylinder (220) comprises the second piston (222) and the second piston rod (223) that are formed in the second cylinder body (221), described the first cylinder body (111) is divided into the first rodless cavity (114) by described first piston (112) and described first piston bar (113), the first rod chamber (115) and center cavity (116), described the second cylinder body (221) is divided into the second rodless cavity (224) and the second rod chamber (225) by described the second piston (222), wherein, described the second rodless cavity (224) is communicated with described center cavity (116) fluid by the first equilibrium valve (13), described the second rod chamber (225) and described the first rod chamber (115) fluid are communicated with, it is characterized in that:
Described electrichydraulic control valve assembly (12) is the electrichydraulic control valve assembly described in any one in claim 1-4, first actuator port (a) of described the first selector valve (121) is communicated with described the first rodless cavity (114) fluid by the second equilibrium valve (14), second actuator port (b) of described the first selector valve (121) is communicated with described center cavity (116) fluid, the filler opening (P1) of described the first selector valve (121) is communicated with the first actuator port (B) fluid of main valve (15), the return opening (T1) of described the first selector valve (121) is communicated with filler opening (P2) fluid of described flow stabilizer (122), the oil outlet (T2) of described flow stabilizer (122) is communicated with return opening (T0) fluid of described main valve (15).
6. electrichydraulic control according to claim 5 loop, is characterized in that, the internal diameter of the filler opening (P2) of described flow stabilizer (122) is greater than the internal diameter (T2) of the oil outlet of described flow stabilizer (122).
7. electrichydraulic control according to claim 5 loop, is characterized in that, the flow of described flow stabilizer is 5L/min.
8. according to the electrichydraulic control loop described in any one in claim 5-7, it is characterized in that, described the first selector valve (121) is three position four-way directional control valve, described electrichydraulic control valve assembly (12) also comprises the second selector valve (128), the filler opening (P5) of described the second selector valve (128) and return opening (T5) are connected respectively the first control end (X) and second control end (Y) of described three position four-way directional control valve, when first piston bar (113) stretches out, when retraction and described the second piston rod (223) are retracted, the first actuator port (a) and filler opening (P1) fluid that described the second selector valve (128) is controlled described three position four-way directional control valve are communicated with, second actuator port (b) of described three position four-way directional control valve and return opening (T1) fluid are communicated with, in the time that described the second piston rod (223) stretches out, the first actuator port (a) and return opening (T1) fluid that described the second selector valve (128) is controlled described three position four-way directional control valve are communicated with, second actuator port (b) of described three position four-way directional control valve and filler opening (P1) fluid are communicated with.
9. electrichydraulic control according to claim 5 loop, it is characterized in that, the filler opening (P3) of described Fill valve (129) and the oil outlet (T2) of described flow stabilizer (122) are all communicated with return opening (T0) fluid of described main valve (15), second actuator port (A) of described main valve (15) is communicated with the first rod chamber (115) fluid of described the first oil cylinder (110), and the oil outlet (T3) of described Fill valve (129) is communicated with described center cavity (116) fluid.
10. electrichydraulic control according to claim 5 loop, it is characterized in that, described electrichydraulic control loop also comprises back pressure valve (16), the return opening (T0) of described main valve (15) is further communicated with filler opening (P4) fluid of described back pressure valve (16), and the return opening (T4) of described back pressure valve (16) is communicated with fuel tank (200) fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420027753.7U CN203670318U (en) | 2014-01-16 | 2014-01-16 | Electro-hydraulic control valve assembly and electro-hydraulic control loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420027753.7U CN203670318U (en) | 2014-01-16 | 2014-01-16 | Electro-hydraulic control valve assembly and electro-hydraulic control loop |
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| Publication Number | Publication Date |
|---|---|
| CN203670318U true CN203670318U (en) | 2014-06-25 |
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|---|---|---|---|
| CN201420027753.7U Expired - Lifetime CN203670318U (en) | 2014-01-16 | 2014-01-16 | Electro-hydraulic control valve assembly and electro-hydraulic control loop |
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| CN (1) | CN203670318U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692146A (en) * | 2019-03-12 | 2020-09-22 | 纳博特斯克有限公司 | Control valve and hydraulic system for construction machinery |
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2014
- 2014-01-16 CN CN201420027753.7U patent/CN203670318U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692146A (en) * | 2019-03-12 | 2020-09-22 | 纳博特斯克有限公司 | Control valve and hydraulic system for construction machinery |
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Granted publication date: 20140625 |