CN214533763U - Electric proportional control hydraulic system - Google Patents
Electric proportional control hydraulic system Download PDFInfo
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- CN214533763U CN214533763U CN202120814834.1U CN202120814834U CN214533763U CN 214533763 U CN214533763 U CN 214533763U CN 202120814834 U CN202120814834 U CN 202120814834U CN 214533763 U CN214533763 U CN 214533763U
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Abstract
The utility model discloses an electric proportional control hydraulic system, including the flexible multiple unit valve of oil pump, a plurality of hydro-cylinders and control cylinder, oil pump and hydro-cylinder are connected to the multiple unit valve, and the multiple unit valve is including corresponding a plurality of liquid accuse proportional reversing valves of each hydro-cylinder respectively, and the oil pump is all connected through the electromagnetism proportional reversing valve who corresponds alone to the liquid accuse mouth at the both ends of every liquid accuse proportional reversing valve. In the working process, the oil pump inputs hydraulic oil into the multi-way valve and simultaneously inputs the hydraulic oil into the electromagnetic proportional directional valve, the output quantity of the hydraulic oil is proportionally regulated by the electromagnetic proportional directional valve, the hydraulic oil is proportionally output to a hydraulic control port of the hydraulic proportional directional valve to realize pilot control, then the hydraulic proportional directional valve moves proportionally, and finally all the oil cylinders stretch proportionally, so that the amplitude and the speed of the action of the forklift can be regulated according to the actual working condition, and the action of the forklift has adjustability.
Description
Technical Field
The utility model relates to a fork truck equipment field especially relates to an electric proportion control hydraulic system.
Background
When the forklift works, the forklift action is generally subjected to pilot control through the switching value electromagnetic directional valve, but the forklift action of the control mode has no adjustability, and the amplitude and the speed of the forklift action cannot be adjusted according to actual working conditions.
Meanwhile, when the forklift mast is at a high position, if the electromagnetic coil controlled by a pilot is damaged, the mast cannot descend, and huge potential safety hazards can be generated. In addition, a certain amount of hydraulic parts and rubber pipes are needed for connecting pipelines, but the internal installation space of the forklift is small, the increase of the number of the rubber pipes can cause the increase of the unreliability of the system, and the generalization cannot be improved.
Therefore, how to provide an electric proportional control hydraulic system which overcomes the above problems is a technical problem which needs to be solved by those skilled in the art at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electricity proportion is controld hydraulic system, through the flexible of each hydro-cylinder of electromagnetism proportion switching-over valve control, can adjust the range and the speed of fork truck action according to operating condition, make the fork truck action have the adjustability.
In order to solve the technical problem, the utility model provides an electricity proportion is controlled hydraulic system, including oil pump, a plurality of hydro-cylinder and control the flexible multiple unit valve of hydro-cylinder, the multiple unit valve is connected the oil pump with the hydro-cylinder, the multiple unit valve is including corresponding respectively a plurality of pilot operated proportional reversing valves of hydro-cylinder, every the pilot operated mouth at the both ends of pilot operated proportional reversing valve all connects through the electromagnetism proportional reversing valve who corresponds alone the oil pump.
Preferably, the oil cylinders are lifting oil cylinders, tilting oil cylinders and accessory oil cylinders and comprise three hydraulic control proportional directional valves and six electromagnetic proportional directional valves.
Preferably, the lifting oil cylinder further comprises a control valve for controlling the on-off of the oil path, an inlet of the control valve is connected with the rodless cavity of the lifting oil cylinder, and an outlet of the control valve is connected with the electromagnetic proportional directional valve for controlling the lifting oil cylinder to descend.
Preferably, all oil inlets of the electromagnetic proportional directional valves are connected with the oil pump through the same oil inlet channel, two one-way valves are sequentially arranged on the oil inlet channel, and outlets of the control valves are connected with oil paths between the two one-way valves.
Preferably, the control valve is embodied as an electromagnetic directional valve with a mechanical directional device.
Preferably, a pressure reducing valve is arranged between the two one-way valves.
Preferably, an energy accumulator is connected to the oil inlet channel.
Preferably, the control valve is a two-position two-way electromagnetic directional valve with a mechanical directional device.
Preferably, the electromagnetic proportional reversing valve further comprises a valve block, and the control valve, the pressure reducing valve and six electromagnetic proportional reversing valves are mounted on the valve block.
Preferably, an oil return port connected with an oil tank, an inlet of the control valve and oil outlets of the six electromagnetic proportional directional valves are arranged in front of the valve block, and the one-way valve is further mounted in front of the valve block.
Preferably, one side face of the valve block is provided with an oil inlet connected with the oil pump and the other one-way valve, and the other side face of the valve block is provided with a connector connected with the energy accumulator.
The utility model provides an electric proportional control hydraulic system, including the flexible multiple unit valve of oil pump, a plurality of hydro-cylinders and control cylinder, oil pump and hydro-cylinder are connected to the multiple unit valve, and the multiple unit valve is including corresponding a plurality of liquid accuse proportional reversing valves of each hydro-cylinder respectively, and the oil pump is all connected through the electromagnetism proportional reversing valve who corresponds alone to the liquid accuse mouth at the both ends of every liquid accuse proportional reversing valve.
In the working process, the oil pump inputs hydraulic oil into the multi-way valve and simultaneously inputs the hydraulic oil into the electromagnetic proportional directional valve, the output quantity of the hydraulic oil is proportionally regulated by the electromagnetic proportional directional valve, the hydraulic oil is proportionally output to a hydraulic control port of the hydraulic proportional directional valve to realize pilot control, then the hydraulic proportional directional valve moves proportionally, and finally all the oil cylinders stretch proportionally, so that the amplitude and the speed of the action of the forklift can be regulated according to the actual working condition, and the action of the forklift has adjustability.
Drawings
FIG. 1 is a hydraulic schematic diagram of one embodiment of an electric proportional control hydraulic system provided by the present invention;
fig. 2 is a schematic structural diagram of a valve block in an embodiment of the electric proportional control hydraulic system provided by the present invention;
fig. 3 is a schematic view of another perspective structure of a valve block in an embodiment of the electric proportional control hydraulic system according to the present invention.
Detailed Description
The core of the utility model is to provide an electric proportional control hydraulic system, through the flexible of each hydro-cylinder of electromagnetic proportional reversing valve control, can adjust the range and the speed of fork truck action according to operating condition, make the fork truck action have the adjustability.
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.
Referring to fig. 1 to 3, fig. 1 is a hydraulic schematic diagram of an embodiment of an electric proportional control hydraulic system according to the present invention; fig. 2 is a schematic structural diagram of a valve block in an embodiment of the electric proportional control hydraulic system provided by the present invention; fig. 3 is a schematic view of another perspective structure of a valve block in an embodiment of the electric proportional control hydraulic system according to the present invention.
The utility model discloses a specific embodiment provides an electric proportional control hydraulic system, including the flexible multiple unit valve of oil pump, oil tank, a plurality of hydro-cylinder and control cylinder, wherein oil pump and hydro-cylinder are connected to the multiple unit valve, and the multiple unit valve includes a plurality of liquid accuse proportional reversing valves 1, corresponds each hydro-cylinder respectively, and every liquid accuse proportional reversing valve 1's both ends all are provided with the liquid accuse mouth, and an electromagnetism proportional reversing valve 2 that corresponds alone is all connected to every liquid accuse mouth, connects the oil pump through electromagnetism proportional reversing valve 2.
In the working process, the oil pump inputs hydraulic oil in the oil tank into the multi-way valve and simultaneously inputs the electromagnetic proportional directional valve 2, the electromagnetic proportional directional valve 2 is controlled through electric control, the electromagnetic proportional directional valve 2 proportionally regulates the output quantity of the hydraulic oil, the proportional output of the hydraulic oil to a hydraulic control port of the hydraulic proportional directional valve 1 realizes pilot control, then the hydraulic proportional directional valve 1 proportionally moves, the output quantity of the hydraulic oil of the hydraulic proportional directional valve 1 is proportionally controlled, and finally, each oil cylinder is proportionally telescopic, the amplitude and the speed of the action of the forklift can be adjusted according to the actual working condition, and the action of the forklift is adjustable.
Specifically, the multiple cylinders on the forklift are a lifting cylinder 3, an inclined cylinder 4 and an accessory cylinder 5, and further include three hydraulic control proportional directional valves 1 corresponding to the three cylinders and six electromagnetic proportional directional valves 2 corresponding to each hydraulic control port.
The utility model discloses among the electric proportional control hydraulic system that embodiment provided, still include control valve 6, the access connection of control valve 6 plays to rise the rodless chamber of hydro-cylinder 3, and an electromagnetic proportional reversing valve 2 of exit linkage of control valve 6, this specific electromagnetic proportional reversing valve 2 are used for controlling to play to rise the decline of hydro-cylinder 3, and this electromagnetic proportional reversing valve 2 is connected the pilot operated mouth that corresponds the pilot operated proportional reversing valve 1 that plays to rise the hydro-cylinder 3 decline promptly. Under normal state, the control valve 6 is in a closed state, the hydraulic oil output by the oil pump flows normally, and flows to the hydraulic control port of the hydraulic control proportional directional valve 1 through the electromagnetic proportional directional valve 2, and the hydraulic oil cannot pass through the control valve 6. When the rodless cavity of the lifting oil cylinder 3 is filled with pressure oil, the gantry is at a high position, the engine is suddenly flamed out at the moment, the oil pump stops working, no hydraulic oil enters, and the pressure is insufficient to control the lifting oil cylinder 3 to completely descend. When the portal frame is at a high position, high pressure exists in a rodless cavity of the lifting oil cylinder 3, the control valve 6 is in an open state at the moment, pressure oil from the rodless cavity of the lifting oil cylinder 3 enters the corresponding electromagnetic proportional directional valve 2 through the control valve 6, when a coil of the electromagnetic proportional directional valve 2 is electrified, an oil path is conducted, the pressure oil enters a hydraulic control port of the corresponding hydraulic proportional directional valve 1, and the lifting oil cylinder 3 is controlled to descend. Through the mode, the lifting oil cylinder 3 can still be retracted and the gantry descends when a fault occurs, so that the safety of the system is improved.
Furthermore, oil inlets of all the electromagnetic proportional directional valves 2 are connected with an oil pump through the same oil inlet channel, two one-way valves 7 are sequentially arranged on the oil inlet channel, an outlet of the control valve 6 is connected with an oil way between the two one-way valves 7, and hydraulic oil is prevented from flowing back through the two one-way valves 7. Meanwhile, a pressure reducing valve 8 is arranged between the two one-way valves 7, and an energy accumulator 9 is connected to the oil inlet channel. Control valve 6 specifically is the solenoid directional valve of taking mechanical reversing device, can the electrically controlled switching-over also manually, or adjusts the arrangement of each part according to the condition, all is in the utility model discloses an within the protection scope.
On the basis of the electric proportional control hydraulic system provided by each specific embodiment, the functions of various valves are integrated on one valve block 10, so that the universality is improved, the hydraulic pipeline is simplified, the maintenance difficulty is reduced, and the space is saved. The hydraulic parts on the valve block 10 are connected through the oil duct inside the valve block 10, so that a connecting rubber tube is omitted, the connecting distance is shortened, the pressure loss of a pipeline is reduced, the efficiency is improved, and the installation is simplified. Specifically, the control valve 6, the pressure reducing valve 8 and six electromagnetic proportional directional valves 2 are mounted on the valve block 10. The front of the valve block 10 is provided with an oil return port connected with an oil tank, an inlet of the control valve 6 and oil outlets of the six electromagnetic proportional directional valves 2, and the front of the valve block 10 is also provided with a one-way valve 7. One side surface of the valve block 10 is provided with an oil inlet connected with the oil pump and the other one-way valve 7, and the other side surface of the valve block 10 is provided with a connector connected with the energy accumulator 9.
Specifically, the Pp port of the multi-way valve is connected with the P port of the valve block 10 to supply oil to the valve block 10, and the P port of the valve block 10 is communicated with the inlet of the first one-way valve 7; an outlet of the first one-way valve 7 is respectively communicated with an inlet of the pressure reducing valve 8, an MP port of the valve block 10 and an outlet of the control valve 6, an inlet of the control valve 6 is communicated with a PB port of the valve block 10, and the PB port is connected with a rodless cavity of the lifting oil cylinder 3; the pressure reducing port of the pressure reducing valve 8 is communicated with the T2 port of the valve block 10, and the T1 port of the valve block 10 is communicated with the T2 port; an outlet of the pressure reducing valve 10 is communicated with an inlet of a second one-way valve 7, an outlet of the second one-way valve 7 is respectively communicated with ports B of the six electromagnetic proportional directional valves 2 and PAT ports and ACC ports of the valve block 10, the ACC ports are connected with an energy accumulator 9, and the ACC ports of the valve block 10 are communicated with a MACC port; the port C of each electromagnetic proportional directional valve 2 is communicated with the port T2 of the valve block 10; the port A of each electromagnetic proportional directional valve 2 is respectively connected with the port LA, the port LB, the port TA, the port TB, the port ATA and the port ATB of the valve block 10, and the ports are respectively connected with the hydraulic control ports of each hydraulic proportional directional valve 1.
When the system works, pressure oil at the multi-way valve reaches a port P of the valve block 10 through a pipeline, the pressure oil passes through the first one-way valve 7 through an internal oil passage of the valve block 10, the pressure oil is divided into two paths, one path of pressure oil reaches an outlet of the control valve 6, at the moment, an electromagnetic coil of the control valve 6 is not electrified, the control valve 6 is in a left position and plays a role in stopping, the control valve 6 is forbidden to flow, and the other path of pressure oil passes through the pressure reducing valve 8. When the pressure of the pressure oil flowing out of the pressure reducing valve 8 is too high, the position of the valve core of the pressure reducing valve 8 is changed by the acting force generated by the pressure, so that the opening degree of the valve port is changed, and the pressure of the pressure oil flowing out of the pressure reducing valve 8 is ensured to be kept relatively constant. The pressure oil flowing from the pressure reducing valve 8 passes through the second check valve 7, reaches the ACC port of the valve block 10 all the way, and is connected to the accumulator 9, and the accumulator 9 can absorb the hydraulic shock in the system, keep the system stable and store a small amount of pressure oil. The other path of pressure oil is connected with the ports B of the electromagnetic proportional directional valves 2. When the corresponding coil of each electromagnetic proportional directional valve 2 is electrified, pressure oil flows in from the port B and flows out from the port A, and enters the multi-way valve through a pipeline and controls the multi-way valve, so that the corresponding lifting oil cylinder 3, the inclined oil cylinder 4 and the accessory oil cylinder 5 generate actions. When the strength of the electrical signal provided to the corresponding coil of the electromagnetic proportional directional valve 2 changes, the opening of the valve port of the corresponding electromagnetic proportional directional valve 2 changes, and the flow rate of the pressure oil flowing out from the port a of the electromagnetic proportional directional valve 2 also changes, thereby changing the operating speed of the working oil cylinder. When the coil of the electromagnetic proportional directional valve 2 is not electrified, the pressure oil is cut off at the port B of the electromagnetic proportional directional valve 2 and cannot flow out from the port A, the multi-way valve cannot be controlled, and the corresponding lifting oil cylinder 3, the inclined oil cylinder 4 and the accessory oil cylinder 5 do not act.
When the rodless cavity of the lifting oil cylinder 3 is filled with pressure oil, the gantry is in a high position. At the moment, the engine suddenly stops working, no pressure oil enters the port P of the valve block 10, and the pressure oil in the energy accumulator 9 is not enough to control the multi-way valve to enable the lifting oil cylinder 3 to completely descend. When the portal is at a high position, high pressure exists in a rodless cavity of the lifting oil cylinder 3, and at the moment, an electromagnetic coil of the control valve 6 is electrified or a mechanical reversing device of the control valve 6 is manually operated, so that the control valve 6 is changed to a right position to work. When the coil of the electromagnetic proportional directional valve 2 is electrified, the oil path is conducted, the pressure oil flows in from the port B, flows out from the port A, reaches the port LB of the valve block 10, and reaches the multi-way valve through the pipeline to control the multi-way valve, so that the lifting oil cylinder 3 descends.
It is right above that the utility model provides an electricity proportion control hydraulic system introduces in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (10)
1. The utility model provides an electricity proportion is controlled hydraulic system, its characterized in that includes oil pump, a plurality of hydro-cylinder and control the flexible multiple unit valve of hydro-cylinder, the multiple unit valve is connected the oil pump with the hydro-cylinder, the multiple unit valve is including corresponding respectively each a plurality of pilot operated proportional reversing valve (1) of hydro-cylinder, every the pilot operated mouth at the both ends of pilot operated proportional reversing valve (1) all connects through electromagnetism proportional reversing valve (2) that correspond alone the oil pump.
2. The electric proportional control hydraulic system according to claim 1, wherein the plurality of cylinders are a lifting cylinder (3), a tilting cylinder (4) and an accessory cylinder (5), and comprises three hydraulic proportional directional control valves (1) and six electromagnetic proportional directional control valves (2).
3. The electro-proportional control hydraulic system according to claim 2, further comprising a control valve (6) for controlling the on-off of an oil path, wherein an inlet of the control valve (6) is connected with the rodless cavity of the lifting oil cylinder (3), and an outlet of the control valve (6) is connected with the electromagnetic proportional directional valve (2) for controlling the lifting oil cylinder (3) to descend.
4. The electro-proportional control hydraulic system according to claim 3, wherein oil inlets of all the electromagnetic proportional directional valves (2) are connected with the oil pump through the same oil inlet channel, two one-way valves (7) are sequentially arranged on the oil inlet channel, and an outlet of the control valve (6) is connected with an oil path between the two one-way valves (7).
5. Electro-proportional operating hydraulic system according to claim 4, characterized in that the control valve (6) is embodied as a solenoid directional valve with a mechanical directional device.
6. Electro-proportional operating hydraulic system according to claim 5, characterized in that a pressure reducing valve (8) is arranged between the two non-return valves (7).
7. The electro-proportional control hydraulic system of claim 6, wherein an accumulator (9) is connected to the oil inlet passage.
8. The electro-proportional hydraulic system according to claim 7, further comprising a valve block (10), the valve block (10) having the control valve (6), the pressure reducing valve (8), and six of the electro-proportional reversing valves (2) mounted thereon.
9. The electro-proportional control hydraulic system according to claim 8, characterized in that an oil return port connected with an oil tank, an inlet of the control valve (6) and oil outlets of six electromagnetic proportional directional valves (2) are arranged in front of the valve block (10), and one check valve (7) is further arranged in front of the valve block (10).
10. Electro-proportional hydraulic system according to claim 9, characterized in that one side of the valve block (10) is provided with an oil inlet for connecting the oil pump and another one-way valve (7), and the other side of the valve block (10) is provided with an interface for connecting the accumulator (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120814834.1U CN214533763U (en) | 2021-04-20 | 2021-04-20 | Electric proportional control hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120814834.1U CN214533763U (en) | 2021-04-20 | 2021-04-20 | Electric proportional control hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214533763U true CN214533763U (en) | 2021-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120814834.1U Active CN214533763U (en) | 2021-04-20 | 2021-04-20 | Electric proportional control hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214533763U (en) |
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2021
- 2021-04-20 CN CN202120814834.1U patent/CN214533763U/en active Active
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