CN110886737A - Electro-hydraulic control valve - Google Patents
Electro-hydraulic control valve Download PDFInfo
- Publication number
- CN110886737A CN110886737A CN201911151095.6A CN201911151095A CN110886737A CN 110886737 A CN110886737 A CN 110886737A CN 201911151095 A CN201911151095 A CN 201911151095A CN 110886737 A CN110886737 A CN 110886737A
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- oil
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- valve
- electromagnetic directional
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an electro-hydraulic control valve, comprising: the valve body is provided with a three-position four-way plate-type electromagnetic reversing valve, a two-position two-way one-way electromagnetic reversing valve I and a two-position two-way one-way electromagnetic reversing valve II, wherein the four-way valve of the plate-type electromagnetic reversing valve is respectively provided with a first working oil port, a second working oil port, an oil inlet and an oil return port, the two oil ports of the one-way electromagnetic reversing valve I are respectively communicated with the first working oil port and the cavity A of the oil cylinder, and the two oil ports of the one-way electromagnetic reversing valve II are respectively communicated with the second working oil port and the cavity B of the oil cylinder. The electro-hydraulic control valve can realize the electromagnetic control of the lifting and descending of the tractor accessories by controlling the action of the oil cylinder, more importantly, realizes the electromagnetic control of the floating operation matched with the terrain, liberates operators from heavy manual operation, and greatly improves the human-machine efficiency.
Description
Technical Field
The invention relates to the field of hydraulic control valves, in particular to an electro-hydraulic control valve.
Background
The country pays more and more attention to agricultural mechanization, and the construction of agricultural equipment is rapidly developed. However, the work operation of controlling the loads of accessories of vehicles such as tractors, harvesters and the like is mainly manual control, so that the labor intensity of workers is high, the work efficiency is low, the automatic construction of agricultural equipment is hindered, and the work operation is deviated from the beautiful requirements of people on the comfort, intelligence and high efficiency of vehicle operation. Such manually operated hydraulic system designs have not been suitable for rapidly developing agricultural intelligence, and such imbalance is particularly evident in hydraulic accessory systems on large tractors.
In the actual production of agricultural machinery, the agricultural machinery often works on uneven ground, the tractor accessory needs to ascend and descend, and the accessory also needs to float up and down along with the ground during working, if an oil cylinder controlling the accessory to move up and down cannot move along with the tractor accessory, the uneven ground forcibly pushes the oil cylinder to move, and the oil cylinder is easily damaged.
However, although there are various control valves capable of raising and lowering the tractor attachment in the related art, the floating electromagnetic operation matching the topography cannot be realized, the efficiency cannot be improved, and the oil cylinder cannot be effectively protected.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an electro-hydraulic control valve which can enable a load cylinder to complete several actions of ascending, descending and floating.
To this end, the present invention proposes an electro-hydraulic control valve comprising: the valve body is provided with a three-position four-way plate-type electromagnetic reversing valve, a two-position two-way one-way electromagnetic reversing valve I and a two-position two-way one-way electromagnetic reversing valve II, wherein the four ways of the plate-type electromagnetic reversing valve are respectively a first working oil port, a second working oil port, an oil inlet and an oil return port, the two oil ports of the one-way electromagnetic reversing valve I are respectively communicated with the first working oil port and a cavity A of an oil cylinder, the two oil ports of the one-way electromagnetic reversing valve II are respectively communicated with the second working oil port and a cavity B of the oil cylinder, and the oil return port forms a first oil return channel to the oil tank.
When the oil cylinder needs to be lifted, the first working oil port is communicated with the oil inlet, the second working oil port is communicated with the oil return port, the one-way electromagnetic directional valve is in one-way communication, oil entering from the oil inlet flows into the cavity A of the oil cylinder, the two-way electromagnetic directional valve is in two-way communication, and the oil in the cavity B of the oil cylinder flows back to the oil tank through the second working oil port, so that a piston rod of the oil cylinder extends outwards.
When the oil cylinder needs to descend, the second working oil port is communicated with the oil inlet, the first working oil port is communicated with the oil return port, the one-way electromagnetic directional valve II is in one-way communication, oil entering from the oil inlet flows into the cavity B of the oil cylinder, the one-way electromagnetic directional valve I is in two-way communication, and the oil in the cavity A of the oil cylinder flows back to the oil tank through the first working oil port, so that a piston rod of the oil cylinder contracts inwards.
When the oil cylinder is in a floating state, the first one-way electromagnetic directional valve and the second one-way electromagnetic directional valve are conducted in two directions, and oil liquid in the cavity A of the oil cylinder and the cavity B of the oil cylinder freely flows back and forth through the plate-type electromagnetic directional valve, so that a piston rod of the oil cylinder freely floats.
And when the oil cylinder does not need to work, oil liquid flows back to the oil tank through the double oil return channels to finish unloading.
Furthermore, the valve body is provided with a P connector connected with a hydraulic source, a T1 connector and a T2 connector which are connected with an oil tank, an A connector connected with an A cavity of the oil cylinder, and a B connector connected with a B cavity of the oil cylinder, and the valve body is also provided with a first oil duct, a second oil duct, a third oil duct and a fourth oil duct which are respectively communicated with four oil ports on the plate-type electromagnetic directional valve, and a fifth oil duct communicated with the T oil ports.
Furthermore, the plate-type electromagnetic reversing valve is an electromagnetic reversing valve with an H-shaped neutral position function, and four oil ports are all communicated under the condition of no power supply.
Furthermore, the first one-way electromagnetic directional valve and the second one-way electromagnetic directional valve are two-position two-way electromagnetic directional valves and are in a one-way conduction state in the middle position and in a two-way guide state in the reversing process.
Compared with the prior art, the invention has the beneficial effects that:
the electro-hydraulic control valve can realize electromagnetic control of lifting and descending of the tractor accessories by controlling the action of the oil cylinder, more importantly, realizes electromagnetic control of floating operation matched with the terrain, frees operators from heavy manual operation, and greatly improves the man-machine efficiency. In addition, the electrohydraulic control valve of the invention is provided with an independent unloading channel, the on-way pressure loss of the whole hydraulic system is reduced to the minimum, the loss of hydraulic energy is reduced, and the fuel efficiency is improved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic front view of an electro-hydraulic control valve of the present invention;
FIG. 2 is a schematic diagram of a top view of the electro-hydraulic control valve of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of the electro-hydraulic control valve of the present invention; and
fig. 4 is a hydraulic schematic of the electro-hydraulic control valve of the present invention.
Description of the reference numerals
1. A valve body; 2. a plate-type electromagnetic directional valve; 3. a one-way electromagnetic directional valve I; 4. a cut-off electromagnetic directional valve; 5. a second one-way electromagnetic directional valve; 6. a P connecting port; 7. a T1 connection port; 8. a T2 connection port; 9. a connector A; 10. a connector B; 11. a first oil passage; 12. a second oil passage; 13. a third oil passage; 14. a fourth oil passage; 15. and a fifth oil passage.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1-4 illustrate some embodiments according to the invention.
As shown in fig. 1-4, an electro-hydraulic control valve comprises a valve body 1, a three-position four-way plate type electromagnetic directional valve 2, a two-position two-way stop type electromagnetic directional valve 4, a two-position two-way one-way electromagnetic directional valve 3 and a two-position two-way one-way electromagnetic directional valve 5 are mounted outside the valve body 1, a plurality of oil passages are processed in the valve body 1, and the plurality of electromagnetic valves are connected with the valve body 1 through the oil passages to form the electro-hydraulic control valve with a complex structure, so that the electro-hydraulic control valve is used for controlling the telescopic action of an oil cylinder and completing the electromagnetic control of the ascending, descending and floating work of a tractor accessory.
The three-position four-way plate type electromagnetic reversing valve 2 is H-shaped, and when the three-position four-way plate type electromagnetic reversing valve is in a middle position, all oil ports are fully opened, and the system is unloaded without oil pressure; the one-way electromagnetic directional valve I3 and the one-way electromagnetic directional valve II 5 are two-position two-way electromagnetic directional valves and are in a one-way conduction state in a middle position and in a two-way conduction state in a reversing state.
Specifically, the valve body 1 is provided with a first oil channel 11, a second oil channel 12, a third oil channel 13, a fourth oil channel 14 and a fifth oil channel 15, the valve body 1 is further provided with a P connecting port 6, a T1 connecting port 7, a T2 connecting port 8, an a connecting port 9 and a B connecting port 10 which are communicated with the oil channels, the P connecting port 6 of the valve body 1 is connected to a gear oil pump and used for supplying oil to the whole control valve, and the P connecting port 6 is communicated with an oil inlet of the plate-type electromagnetic directional valve 2 through the fourth oil channel 14.
One interface of the cut-off type electromagnetic directional valve 4 is communicated with a gear pump for supplying oil through a branch oil passage of the fourth oil passage 14, the other interface of the cut-off type electromagnetic directional valve 4 is communicated with the T2 interface 8 through the fifth oil passage 15 to form a second oil return channel, and the T1 interface and the T2 interface are both connected with an oil tank to realize oil return.
Specifically, an oil return port of the three-position four-way plate-type electromagnetic directional valve 2 is communicated with a T1 connection port 7 through a second oil duct 12 to form a first oil return channel; a first working oil port of the plate-type electromagnetic directional valve 2 is connected with a first one-way electromagnetic directional valve 3 through a first oil duct 11, and a second working oil port of the three-position four-way plate-type electromagnetic directional valve 2 is connected with a second one-way electromagnetic directional valve 5 through a third oil duct 13. The B connecting port 10 is connected to the other port of the second one-way electromagnetic directional valve 5, and the A connecting port 9 is connected to the other port of the first one-way electromagnetic directional valve 3.
As shown in fig. 4, each electromagnetic valve has one electromagnetic switch, and the power-on conditions of the switches of the tractor accessories in different working states are inconsistent, for convenience of distinction, the electromagnetic switch on the cutoff electromagnetic directional valve 4 is labeled as DT1, the two electromagnetic switches on the three-position four-way plate-type electromagnetic directional valve 2 are labeled as DT2 and DT3, respectively, wherein the DT2 communicates the oil inlet with the first working oil port, the oil return port communicates with the second working oil port, the electromagnetic switch on the one-way electromagnetic directional valve two 5 is labeled as DT4, and the electromagnetic switch on the one-way electromagnetic directional valve one 3 is labeled as DT 5. As shown in table 1, the power on/off condition of the electromagnetic switch of each electromagnetic valve in the electrohydraulic control valve is shown when the tractor accessories are in different working states.
TABLE 1 electromagnetic valve action sequence chart
The working principle and the working process of the electro-hydraulic control valve are as follows:
with the combination of table 1 and fig. 1-4, when the tractor accessory does not work, all the electromagnetic switches are in an unpowered state, the plate-type electromagnetic directional valve 2 is in an open circuit state, the cut-off type electromagnetic directional valve 4 is in a closed circuit state, oil entering from the P connecting port 6 flows into the cut-off type electromagnetic directional valve 4 through the branch oil passage of the fourth oil passage 14, then flows out from the other interface of the cut-off type electromagnetic directional valve 4, returns to the T2 connecting port 8 through the fifth oil passage 15, oil in the fourth oil passage 14 can also flow into the second oil passage 12 through the plate-type electromagnetic directional valve 2, and finally flows out to the oil tank from the T1 connecting port, and double oil return is formed through the structure, so that the on-way pressure loss in a system pipeline is effectively reduced, the heat loss is reduced, the energy utilization rate of the whole machine is improved, and the purpose of.
When the tractor accessory needs to be lifted, the electromagnetic switch DT1 of the cut-off electromagnetic directional valve 4 is operated to be electrified, the fifth oil duct 15 is closed, the electromagnetic switch DT2 on the plate-type electromagnetic directional valve 2 and the electromagnetic switch DT4 on the one-way electromagnetic directional valve II 5 are operated to be electrified, oil flows into the cavity A of the oil cylinder through the fourth oil duct 14, the three-position four-way plate-type electromagnetic directional valve 2, the first oil duct 11, the one-way electromagnetic directional valve I3 and the connector A9 in sequence, the oil pushes the piston rod of the oil cylinder to move, the oil in the cavity B of the oil cylinder flows to the connector T1 through the two one-way electromagnetic directional valve II 5, the third oil duct 13, the three-position four-way plate-type electromagnetic directional valve 2 and the second oil duct 12 in sequence, and then flows back to the connector T1.
When the tractor accessory needs to descend, the electromagnetic switch DT1 of the cut-off type electromagnetic directional valve 4 is operated to be electrified, the fifth oil duct 15 is closed, the electromagnetic switch DT3 on the plate type electromagnetic directional valve 2 and the electromagnetic switch DT5 of the one-way electromagnetic directional valve I3 are operated to be electrified, oil flows into the cavity B of the oil cylinder through the fourth oil duct 14, the three-position four-way plate type electromagnetic directional valve 2, the third oil duct 13, the one-way electromagnetic directional valve II 5 and the connector B10 in sequence, the oil pushes the piston rod of the oil cylinder to move, the oil in the cavity A at the other end of the oil cylinder flows to the connector T1 through the one-way electromagnetic directional valve I3, the first oil duct 11, the three-position four-way plate type electromagnetic directional valve 2 and the second oil duct 12 in sequence, and then flows back to the connector T1.
When the accessory needs to be matched with terrain for operation, namely the accessory can float up and down along with the height of the terrain without load, the electromagnetic switch DT5 on the one-way electromagnetic directional valve I3 and the electromagnetic switch DT4 on the one-way electromagnetic directional valve II 5 are both electrified, the rest electromagnetic switches are not electrified, oil in the connecting port P is respectively returned to the connecting port 7 of T1 and the connecting port 8 of T2 through the fourth oil duct 14 and the fifth oil duct 15 to form double unloading, oil in the cavity A of the oil cylinder returns to the oil return port of T1 through the first oil duct 11 and the second oil duct 12, and similarly, oil in the cavity B of the oil cylinder returns to the oil return port T1 through the third oil duct 13 and the second oil duct 12 to form oil cylinder oil port unloading, namely the oil cylinder forms a free floating state.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An electro-hydraulic control valve, comprising: the valve comprises a valve body (1), wherein a three-position four-way plate-type electromagnetic reversing valve (2), a two-position two-way one-way electromagnetic reversing valve I (3) and a two-position two-way one-way electromagnetic reversing valve II (5) are arranged on the valve body (1),
the four-way joint of the plate-type electromagnetic reversing valve (2) is respectively provided with a first working oil port, a second working oil port, an oil inlet and an oil return port, two oil ports of the one-way electromagnetic reversing valve I (3) are respectively communicated with the first working oil port and a cavity A of an oil cylinder, two oil ports of the one-way electromagnetic reversing valve II (5) are respectively communicated with the second working oil port and a cavity B of the oil cylinder, wherein a first oil return channel is formed from the oil return port to an oil tank,
when the oil cylinder needs to be lifted, the first working oil port is communicated with the oil inlet, the second working oil port is communicated with the oil return port, the one-way electromagnetic directional valve I (3) is in one-way communication, oil entering from the oil inlet flows into the cavity A of the oil cylinder, the one-way electromagnetic directional valve II (5) is in two-way communication, the oil in the cavity B of the oil cylinder flows back to the oil tank through the second working oil port, so that a piston rod of the oil cylinder extends outwards,
when the oil cylinder needs to descend, the second working oil port is communicated with the oil inlet, the first working oil port is communicated with the oil return port, the one-way electromagnetic directional valve II (5) is in one-way communication, oil entering from the oil inlet flows into the cavity B of the oil cylinder, the one-way electromagnetic directional valve I (3) is in two-way communication, the oil in the cavity A of the oil cylinder flows back to the oil tank through the first working oil port, so that a piston rod of the oil cylinder contracts inwards,
when the oil cylinder is in a floating state, the one-way electromagnetic directional valve I (3) and the one-way electromagnetic directional valve II (5) are both conducted in two directions, and oil liquid in the cavity A of the oil cylinder and the cavity B of the oil cylinder freely flows back and forth through the plate-type electromagnetic directional valve (2), so that a piston rod of the oil cylinder freely floats.
2. The electro-hydraulic control valve according to claim 1, further comprising a second oil return passage, wherein the second oil return passage is provided with a two-position two-way cut-off type electromagnetic directional valve (4), and when the oil cylinder does not need to work, oil flows back to the oil tank through the two oil return passages to complete unloading.
3. The electro-hydraulic control valve according to claim 2, wherein the valve body (1) is provided with a P connecting port (6) connected with a hydraulic pressure source, a T1 connecting port (7) and a T2 connecting port (8) connected with an oil tank, an A connecting port (9) connected with an A cavity of the oil cylinder, and a B connecting port (10) connected with a B cavity of the oil cylinder, the valve body (1) is further provided with a first oil passage (11), a second oil passage (12), a third oil passage (13), a fourth oil passage (14) respectively communicated with four oil ports on the plate-type electromagnetic directional valve (2), and a fifth oil passage (15) communicated with the T2 connecting port (8).
4. The electrohydraulic control valve according to claim 1, wherein the plate-type solenoid directional valve (2) is a solenoid directional valve which can be H-shaped in a neutral position function, and four oil ports are all communicated in an electric-power-off state.
5. The electro-hydraulic control valve according to claim 1, wherein the first one-way electromagnetic directional valve (3) and the second one-way electromagnetic directional valve (5) are two-position two-way electromagnetic directional valves, and are in a one-way conduction state in a neutral position and in a two-way conduction state in a direction change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911151095.6A CN110886737A (en) | 2019-11-21 | 2019-11-21 | Electro-hydraulic control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911151095.6A CN110886737A (en) | 2019-11-21 | 2019-11-21 | Electro-hydraulic control valve |
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| Publication Number | Publication Date |
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| CN110886737A true CN110886737A (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911151095.6A Pending CN110886737A (en) | 2019-11-21 | 2019-11-21 | Electro-hydraulic control valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096700A (en) * | 2020-09-05 | 2020-12-18 | 江苏常发农业装备股份有限公司 | Electric control strong pressure valve and hydraulic control system |
-
2019
- 2019-11-21 CN CN201911151095.6A patent/CN110886737A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096700A (en) * | 2020-09-05 | 2020-12-18 | 江苏常发农业装备股份有限公司 | Electric control strong pressure valve and hydraulic control system |
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