CN114321072A - Electro-hydraulic proportional three-way slide valve - Google Patents
Electro-hydraulic proportional three-way slide valve Download PDFInfo
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- CN114321072A CN114321072A CN202210009121.7A CN202210009121A CN114321072A CN 114321072 A CN114321072 A CN 114321072A CN 202210009121 A CN202210009121 A CN 202210009121A CN 114321072 A CN114321072 A CN 114321072A
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Abstract
The invention discloses an electro-hydraulic proportional three-way sliding valve which comprises a valve body, wherein a through main oil hole is formed in the valve body, a sealing end cover and a control end cover are fixedly connected to the valve body at two ends of the main oil hole respectively, an electro-proportional control valve is fixedly connected to one end, far away from the valve body, of the control end cover, a proportional electromagnet is fixedly connected to one end, far away from the control end cover, of the electro-proportional control valve, a spring cavity communicated with the main oil hole is formed in the control end cover, and a main valve core is connected to the main oil hole in a sliding mode. The invention is suitable for solving the problem that an operator cannot control the three-way sliding valve to accurately slightly move due to the fact that the control current input of the electro-hydraulic proportional reversing valve and the displacement output of the main valve element are not in a linear relation in the prior art.
Description
Technical Field
The invention relates to an electro-hydraulic proportional three-way slide valve, and belongs to the technical field of multi-way slide valves.
Background
Hydraulic control valves (hydraulic valves for short) are indispensable elements in hydraulic systems, and elements for controlling fluid pressure, flow and direction in hydraulic transmission are commonly in different structural forms such as slide valves, cone valves or sliding cone valves. The valve element can be driven by various methods such as manual, motor, electromagnetic drive, hydraulic drive, and the like. The manual operation is simplest, the electromagnetic driving is easy to realize automatic control, but the manual and electromagnetic driving modes at high pressure and large flow cannot overcome huge valve core resistance, and people have to adopt a hydraulic driving mode at this time.
When current hydraulic pressure multiple unit valve is used, when fluid flowed through the valve port, because the change of flow direction and velocity of flow can cause the change of fluid momentum, the case can receive additional effort, hydraulic power promptly, and the motion of case can be influenced equally to this kind of power, leads to the position of main valve core to be difficult to accurate control, and then influences product hydraulic system's the performance of controlling. FIG. 3 is a flow test curve of the proportional control main valve when reversing, the control pressure is increased proportionally and then decreased, and the valve port flow has a large hysteresis.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an electro-hydraulic proportional three-way sliding valve which is used for solving the problem that an operator cannot control the three-way sliding valve to perform precise micro-motion due to the fact that the control current input of an electro-hydraulic proportional reversing valve and the displacement output of a main valve core are not in a linear relation in the prior art.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme: an electro-hydraulic proportional three-way sliding valve comprises a valve body, wherein a through main oil hole is formed in the valve body, a sealing end cover and a control end cover are fixedly connected to the valve body at two ends of the main oil hole respectively, an electric proportional control valve is fixedly connected to one end, far away from the valve body, of the control end cover, a proportional electromagnet is fixedly connected to one end, far away from the control end cover, of the electric proportional control valve, a spring cavity communicated with the main oil hole is formed in the control end cover, a main valve core is connected in the main oil hole in a sliding mode, a main oil way is arranged on the valve body and provided with three oil ports P/A/T, the oil ports P/A/T are communicated with the main oil hole, a pilot oil way is arranged on the electric proportional control valve and provided with three oil ports Pi/X/L, and the pilot oil port X is communicated with the sealing end cover, the spring cavity is internally provided with a spring mechanism, the spring mechanism comprises a reversing spring seat, a reversing spring, a bolt sleeve, a bolt and a feedback spring, the main valve core is connected with the bolt sleeve through the bolt, the reversing spring seats are installed at two ends of the bolt sleeve, the reversing spring is installed in the reversing spring seat, a load spring seat is arranged at the end head of the control end cover, one end of the feedback spring is connected with the load spring seat, and the other end of the feedback spring is connected with the bolt.
Preferably, the oil port X is a pilot reversing control output oil port, and an oil passage communicated with the oil port X is arranged between the oil port X and the sealing end cover.
Preferably, a hollow pilot proportional valve core is mounted on the electric proportional control valve, the oil port L is an unloading oil port, and the unloading oil port L is communicated with a spring cavity of the control end cover.
Preferably, a rod sleeve for limiting the stroke of the bolt is fixedly connected to the bolt sleeve.
Preferably, the reversing spring seat, the bolt sleeve and the control end cover are in clearance fit.
Compared with the prior art, the invention has the following beneficial effects: when the electro-hydraulic proportional three-way spool valve outputs pilot pressure through the X port to enter the sealing end cover to push the main spool to move leftwards, the bolt sleeve connected with the main spool bolt also moves leftwards to compress the feedback spring to generate leftward thrust to the pilot proportional spool, and the acting force can counterbalance the thrust output by the proportional electromagnet at the leftmost end, so that the pilot proportional spool works at a middle position, and at the moment, Pi is communicated with the X port or the X port and is communicated with the L port, and after a force balance state is reached, the position of the main spool is stable. Finally, the control current-valve core displacement is in a linear proportional relation, and the controllability of the position of the main valve core is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic diagram of an electro-hydraulic proportional three-way spool valve according to an embodiment of the present invention.
FIG. 3 is a graph of control flow versus control pressure for a single-way reversing multiple-way valve in the prior art.
In the figure: 1. sealing the end cap; 2. a valve body; 3. a main valve element; 4. a control end cap; 5. a first reversing spring seat; 6. a reversing spring; 7. a rod sleeve; 8. a bolt sleeve; 9. a second reversing spring seat; 10. a bolt; 11. a feedback spring; 12. a load spring seat; 13. an electric proportional control valve; 14. a pilot proportional spool; 15. a proportional electromagnet; 16. and the pilot control output oil way.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, an electro-hydraulic proportional three-way sliding valve includes a valve body 2, a main oil hole is formed in the valve body 2, a sealing end cap 1 and a control end cap 4 are respectively and fixedly connected to the valve body 2 at two ends of the main oil hole, an electro-proportional control valve 13 is fixedly connected to one end of the control end cap 4 far away from the valve body 2, a proportional electromagnet 15 is fixedly connected to one end of the electro-proportional control valve 13 far away from the control end cap 4, a spring cavity communicated with the main oil hole is formed in the control end cap 4, a main valve core 3 is slidably connected to the main oil hole, a main oil path is formed in the valve body 2, the main oil path has three oil ports P/a/T, the oil ports P/a/T are all communicated with the main oil hole, specifically, the three oil ports P/a/T formed in the valve body 2 are respectively located at two sides of the valve body 2, the three oil ports P/A/T represent an oil supply pressure source of the main oil way, and the reversing control output oil port and the oil return port respectively.
The electric proportional control valve 13 is provided with a pilot oil path, the pilot oil path is provided with three oil ports Pi/X/L, the three oil ports Pi/X/L represent a pilot oil supply pressure source of the pilot oil path, a reversing control output oil port and an oil return port respectively, the pilot oil port X is communicated with the sealing end cover 1, and specifically, a communicated pilot control output oil path 16 is arranged between the oil port X and the sealing end cover 1.
Be provided with spring mechanism in the spring chamber, spring mechanism includes switching-over spring holder, switching-over spring 6, bolt cover 8, bolt 10, feedback spring 11, main valve core 3 passes through bolt 10 with bolt cover 8 and is connected, fixedly connected with is used for restricting the rod cover 7 of bolt 10 stroke on the bolt cover 8, the switching-over spring holder is installed at the both ends of bolt cover 8, and is concrete, the switching-over spring holder includes first switching-over spring holder 5 and second switching-over spring holder 9, switching-over spring 6 installs in the switching-over spring holder, the switching-over spring holder is clearance fit with bolt cover 8, control end cover 4. The feedback spring 11 is installed in the control end cover 4, specifically, a load spring seat 12 is arranged at the end of the control end cover 4, one end of the feedback spring 11 is connected with the load spring seat 12, and the other end of the feedback spring is connected with the bolt 10. The electric proportional control valve 13 is provided with a hollow pilot proportional valve core 14, the oil port L is an unloading oil port, and the unloading oil port L is communicated with a spring cavity of the control end cover 4. Specifically, the unloading oil port L is communicated with a spring cavity where the reversing spring 6 is located, and is also communicated with a spring cavity where the feedback spring 11 is located.
The electro-hydraulic proportional three-way sliding valve is shown in a schematic diagram in fig. 2, when the proportional electromagnet 15 is not electrified, the pilot oil port Pi is cut off, the control port X is connected with the unloading L, at the moment, the main valve core 3 does not move and works at a left normal position, the main oil path P is communicated with A, and is communicated with T; when the proportional electromagnet 15 is electrified and supplies a certain control current, the control pressure of the X port is output, so that the main valve core 3 works in a middle position state, the main oil way P is communicated with the A, and the T port is blocked; when the proportional electromagnet is electrified to the maximum control current value, the control pressure of the X port is output, so that the main valve element 3 works in a right state, the main oil way P is blocked, and the port A is communicated with the port T. Specifically, the electric proportional control valve 13 outputs pilot pressure through an X port to enter the sealing end cover 1 to push the main valve element 3 to move leftward, the bolt sleeve 8 connected with the bolt 10 of the main valve element 3 also moves leftward to compress the feedback spring 11, so as to generate leftward thrust on the pilot proportional valve element 14, and the acting force can counterbalance the thrust output by the proportional electromagnet 15 at the leftmost end, so that the pilot proportional valve element 14 works at a middle position, at the moment, Pi passes through the X port or the X port and passes through the L port, after a force balance state is reached, the position of the main valve element 3 is stable, and finally, the control current and the valve element displacement are in a linear proportional relationship, and the position controllability of the main valve element 3 is improved.
Specifically, when the proportional electromagnet 15 is powered and supplies a certain control current, the pilot proportional spool 14 moves rightward, pushes the load spring seat 12 to compress the feedback spring 11, and the pilot proportional spool 14 keeps balance under the thrust of the electromagnet and the spring force of the feedback spring 11 regardless of friction force, gravity and other influences. Since the stiffness of the reversing spring 6 of main spool 3 is much greater than that of the feedback spring 11, the displacement of main spool 3 due to the rightward movement of pilot proportional spool 14 has little influence and can be ignored. At this time, pilot oil Pi is communicated with control port X, and leakage port L is closed. The main valve core 3 moves leftwards under the action of the pressure controlled by the port X, and the port P of the main valve is communicated with the port A to realize reversing. When the hydraulic force caused by the change of the flow direction and the flow speed affects the movement of the main valve core 3, the following two conditions are divided:
1) when the valve core is moved leftwards by hydraulic force, even if the leftward displacement of the main valve core 3 is increased, the bolt sleeve 8 connected with the bolt 10 of the main valve core 3 is also moved leftwards, the feedback spring 11 is further compressed, the force of the feedback spring 11 is increased, a leftward thrust is generated on the pilot proportional valve core 14, the acting force is in counter balance with the thrust output by the proportional electromagnet 15, namely when the input current of the electromagnet is not changed, the output thrust is not changed, the force of the feedback spring 11 is increased, the pilot proportional valve core 14 is moved leftwards, namely the displacement of the pilot proportional valve core 14 is reduced, the pilot valve opening degree is reduced, the control pressure of an X port is reduced, the leftward displacement of the main valve core 3 is reduced, and after a force balance state is reached, the position of the main valve core 3 is stabilized.
2) When the valve core is moved rightwards by hydraulic force, even if the leftward displacement of the main valve core 3 is reduced, the bolt sleeve 8 connected with the bolt 10 of the main valve core 3 also moves rightwards, so that the force of the feedback spring 11 is reduced, the leftward thrust of the pilot proportional valve core 14 is reduced, the acting force is balanced with the thrust output by the proportional electromagnet 15, namely, when the input current of the electromagnet is not changed, the output thrust is not changed, the force of the feedback spring 11 is reduced, so that the pilot proportional valve core 14 moves rightwards, namely, the displacement of the pilot proportional valve core 14 is increased, the pilot valve opening is increased, the control pressure of an X port is increased, the leftward displacement of the main valve core 3 is increased, and after a force balance state is reached, the position of the main valve core 3 is stable
In the dynamic adjustment process of the pilot proportional valve core 14, the pilot proportional valve core 14 is in a transition position, the port X is communicated with the port Pi and the port L simultaneously, and finally, the control current-valve core displacement is in a linear proportional relation, so that the control precision of the electro-hydraulic proportional three-way sliding valve is improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides an electricity liquid proportion three-way sliding valve, includes the valve body, its characterized in that: the main oil hole is formed in the valve body, a sealing end cover and a control end cover are fixedly connected to the valve body at two ends of the main oil hole respectively, an electric proportional control valve is fixedly connected to one end, far away from the valve body, of the control end cover, a proportional electromagnet is fixedly connected to one end, far away from the control end cover, of the electric proportional control valve, a spring cavity communicated with the main oil hole is formed in the control end cover, a main valve core is connected in the main oil hole in a sliding mode, a main oil way is arranged on the valve body, the main oil way is provided with three oil ports P/A/T, the oil ports P/A/T are communicated with the main oil hole, a pilot oil way is arranged on the electric proportional control valve, the pilot oil way is provided with three oil ports Pi/X/L, the pilot oil port X is communicated with the sealing end cover, and a spring mechanism is arranged in the spring cavity;
the spring mechanism comprises a reversing spring seat, a reversing spring, a bolt sleeve, a bolt and a feedback spring, the main valve core is connected with the bolt sleeve through the bolt, the reversing spring seat is installed at two ends of the bolt sleeve, the reversing spring is installed in the reversing spring seat, a load spring seat is arranged at the end of the control end cover, one end of the feedback spring is connected with the load spring seat, and the other end of the feedback spring is connected with the bolt.
2. An electro-hydraulic proportional three-way spool valve as claimed in claim 1, wherein: the oil port X is a pilot reversing control output oil port, and an oil passage communicated with the oil port X is arranged between the oil port X and the sealing end cover.
3. An electro-hydraulic proportional three-way spool valve as claimed in claim 2, wherein: the electric proportional control valve is provided with a hollow pilot proportional valve core, the oil port L is an unloading oil port, and the unloading oil port L is communicated with a spring cavity of the control end cover.
4. An electro-hydraulic proportional three-way spool valve as claimed in claim 1, wherein: the three oil holes P/A/T formed in the valve body are respectively positioned on two sides of the valve body.
5. An electro-hydraulic proportional three-way spool valve as claimed in claim 1, wherein: and a rod sleeve for limiting the stroke of the bolt is fixedly connected to the bolt sleeve.
6. An electro-hydraulic proportional three-way spool valve as claimed in claim 1, wherein: the reversing spring seat, the bolt sleeve and the control end cover are in clearance fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009121.7A CN114321072A (en) | 2022-01-06 | 2022-01-06 | Electro-hydraulic proportional three-way slide valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009121.7A CN114321072A (en) | 2022-01-06 | 2022-01-06 | Electro-hydraulic proportional three-way slide valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114321072A true CN114321072A (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210009121.7A Pending CN114321072A (en) | 2022-01-06 | 2022-01-06 | Electro-hydraulic proportional three-way slide valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114321072A (en) |
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2022
- 2022-01-06 CN CN202210009121.7A patent/CN114321072A/en active Pending
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