CN114198350B - Electro-hydraulic steering controllable monostable split-flow type hydraulic system of industrial vehicle machinery - Google Patents
Electro-hydraulic steering controllable monostable split-flow type hydraulic system of industrial vehicle machinery Download PDFInfo
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- CN114198350B CN114198350B CN202210032165.1A CN202210032165A CN114198350B CN 114198350 B CN114198350 B CN 114198350B CN 202210032165 A CN202210032165 A CN 202210032165A CN 114198350 B CN114198350 B CN 114198350B
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- 230000002457 bidirectional effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 118
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Classifications
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/09—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
- B62D5/12—Piston and cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07568—Steering arrangements
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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
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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
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The application discloses a monostable split-flow type hydraulic system with controllable mechanical and electrohydraulic steering of an industrial vehicle, which comprises an oil tank, a multi-way valve assembly, a steering control valve assembly and a steering oil cylinder, wherein the oil tank is connected with the multi-way valve assembly; the multi-way valve assembly is connected with the oil tank, the multi-way valve assembly is connected with the steering control valve assembly, and the steering control valve assembly is connected with the steering oil cylinder; the steering control valve assembly comprises a first reversing valve, a second reversing valve and a third reversing valve which are sequentially connected; the steering device is connected with the steering control valve assembly and is connected with the steering oil cylinder; the steering signal valve is connected with the steering gear, and the steering signal valve is connected with the second reversing valve. The hydraulic system not only can realize automatic electrohydraulic steering control, but also can realize manual steering when a mechanical steering wheel is manually operated in the automatic electrohydraulic steering control process, and ensures that the priority of the manual steering is higher than that of the automatic electrohydraulic steering control, thereby greatly improving the running safety of the vehicle.
Description
Technical Field
The application relates to the technical field of hydraulic control, in particular to a monostable shunt type hydraulic system with controllable electrohydraulic steering of industrial vehicle machinery.
Background
At present, the steering function of the diesel fork truck is realized by connecting a mechanical steering column through a steering wheel, connecting the mechanical steering column to a steering gear through a machine and supplying oil to a steering cylinder through the steering gear. However, the steering function in the prior art is realized by a mechanical steering mechanism connected to a steering gear, and it is necessary to use an artificial steering wheel to realize the steering function. Therefore, according to the application requirements of the forklift, it is necessary to provide a hydraulic system capable of realizing automatic control or remote control in good time.
Disclosure of Invention
The application aims to provide a monostable shunt type hydraulic system with controllable electrohydraulic steering of industrial vehicle machinery, which can realize automatic steering control and ensure the priority of manual steering.
In order to achieve the above purpose, the application provides a monostable shunt type hydraulic system with controllable electrohydraulic steering of industrial vehicle machinery, which comprises an oil tank, a multi-way valve assembly, a steering control valve assembly and a steering oil cylinder;
The port P of the multi-way valve assembly is connected with the oil tank, the port CF of the multi-way valve assembly is connected with the port P of the steering control valve assembly, and the port L and the port R of the steering control valve assembly are respectively connected with the cavity A and the cavity B of the steering oil cylinder;
The steering control valve assembly comprises a first steering valve, a second steering valve and a third steering valve, the first steering valve is connected with a P port of the steering control valve assembly, the second steering valve is connected with the first steering valve, the third steering valve is connected with the second steering valve, and the third steering valve is connected with an L port and an R port of the steering control valve assembly;
When the system receives a first steering signal, the first steering valve is electrically commutated, and oil in the oil tank is conveyed to a P port of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first steering valve, the second steering valve and the third steering valve in sequence so as to realize steering;
The system also comprises a steering gear and a steering signal valve, wherein a P port of the steering gear is connected with a P1 port of the steering control valve assembly, and an L port and an R port of the steering gear are respectively connected with an A cavity and a B cavity of the steering oil cylinder; the P1 port and the P2 port of the steering signal valve are respectively connected with the L port and the R port of the steering gear, and the PP port of the steering signal valve is connected with the signal port of the second reversing valve;
when the system receives a second steering signal, the pressure signal generated by the steering device is transmitted to the signal port of the second steering valve through the steering signal valve so as to steer the second steering valve, and the oil in the oil tank is transmitted to the P port of the steering control valve assembly through the multi-way valve assembly and is sequentially transmitted to the steering oil cylinder through the first steering valve, the second steering valve and the steering device, so that steering is realized.
Optionally, the multi-way valve assembly comprises a monostable diverter valve and a one-way valve, an oil inlet of the monostable diverter valve is connected with the oil tank, an oil outlet of the monostable diverter valve is connected with an oil inlet of the one-way valve, and an oil outlet of the one-way valve is connected with a P port of the steering control valve assembly.
Optionally, the multi-way valve assembly further comprises an overflow valve, an oil inlet of the overflow valve is connected with an oil outlet of the monostable diverter valve, and an oil outlet of the overflow valve is connected with the oil tank.
Optionally, the device further comprises a power assembly connected with the oil tank and used for supplying the monostable diverter valve after absorbing oil from the oil tank.
Optionally, an oil suction filter is connected between the power assembly and the oil tank.
Optionally, the steering control valve assembly further comprises a fourth reversing valve;
the signal port of the fourth reversing valve is connected with the signal port of the third reversing valve;
the oil inlet of the fourth reversing valve is connected with the oil outlet of the second reversing valve;
And an oil outlet of the fourth reversing valve is connected with the oil tank.
Optionally, the first reversing valve is a two-position three-way electromagnetic reversing valve, the second reversing valve is a two-position three-way hydraulic control reversing valve, the third reversing valve is a three-position five-way electric proportional reversing valve, and the fourth reversing valve is a two-position two-way hydraulic control reversing valve.
Optionally, a bidirectional hydraulic lock is connected between the steering device and the steering cylinder, and between the third reversing valve and the steering cylinder.
Optionally, the T-port of the diverter is connected to the tank.
Compared with the background art, the electro-hydraulic steering controllable monostable split-flow type hydraulic system of the industrial vehicle machinery provided by the embodiment of the application comprises an oil tank, a multi-way valve assembly, a steering control valve assembly and a steering oil cylinder.
The port P of the multi-way valve assembly is connected with the oil tank, the port CF of the multi-way valve assembly is connected with the port P of the steering control valve assembly, and the port L and the port R of the steering control valve assembly are respectively connected with the cavity A and the cavity B of the steering oil cylinder; further, the steering control valve assembly comprises a first reversing valve, a second reversing valve and a third reversing valve, wherein the first reversing valve is connected with a P port of the steering control valve assembly, the second reversing valve is connected with the first reversing valve, the third reversing valve is connected with the second reversing valve, and the third reversing valve is connected with an L port and an R port of the steering control valve assembly.
Therefore, when the system receives a first steering signal, the first steering valve is electrified to steer, oil in the oil tank is conveyed to the P port of the steering control valve assembly through the multi-way valve assembly, and is conveyed to the steering oil cylinder through the first steering valve, the second steering valve and the third steering valve in sequence, so that steering is realized. Specifically, the first steering signal may be a steering signal sent by an electronic steering wheel, or may be a steering signal sent by an unmanned system, and after receiving the steering signal, the hydraulic system may enable the first reversing valve to be electrically reversed, so that electro-hydraulic steering is further realized through the first reversing valve, the second reversing valve and the third reversing valve.
The system also comprises a steering gear and a steering signal valve, wherein the P port of the steering gear is connected with the P1 port of the steering control valve assembly, and the L port and the R port of the steering gear are respectively connected with the A cavity and the B cavity of the steering oil cylinder; the P1 port and the P2 port of the steering signal valve are respectively connected with the L port and the R port of the steering gear, and the PP port of the steering signal valve is connected with the signal port of the second reversing valve;
When the system receives a second steering signal, the pressure signal generated by the steering device is transmitted to the signal port of the second steering valve through the steering signal valve so as to steer the second steering valve, oil in the oil tank is conveyed to the P port of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first steering valve, the second steering valve and the steering device in sequence, and therefore steering is achieved. Specifically, the second steering signal may be a steering signal obtained by manually operating a mechanical steering wheel when the system is in electrohydraulic steering, and the hydraulic system may electrically reverse the second reversing valve after receiving the steering signal, thereby further realizing manual preferential steering through the first reversing valve, the second reversing valve and the steering gear.
Compared with the traditional hydraulic system which cannot realize automatic control, the hydraulic system provided by the application can realize automatic electrohydraulic steering control on one hand, and can realize manual steering when a mechanical steering wheel is manually operated in the automatic electrohydraulic steering control process on the other hand, and ensure that the priority of the manual steering is higher than that of the automatic electrohydraulic steering control, so that the running safety of a vehicle can be greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an electro-hydraulic steering controllable monostable split-flow hydraulic system for an industrial vehicle machine according to an embodiment of the present application;
FIG. 2 is a schematic illustration of the connection of a steering control valve assembly in an electro-hydraulic steering controllable monostable split-flow hydraulic system of the industrial vehicle machine of FIG. 1.
Wherein:
1-oil tank, 2-oil absorption filter, 3-power assembly, 4-multiple valve assembly, 41-monostable diverter valve, 42-check valve, 43-overflow valve, 5-steering device, 6-steering control valve assembly, 61-first reversing valve, 62-second reversing valve, 63-third reversing valve, 64-fourth reversing valve, 7-steering signal valve, 8-bidirectional hydraulic lock and 9-steering oil cylinder.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The present application will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present application.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of an electro-hydraulic steering controllable monostable split-flow hydraulic system of an industrial vehicle machine according to an embodiment of the present application; FIG. 2 is a schematic illustration of the connection of a steering control valve assembly in an electro-hydraulic steering controllable monostable split-flow hydraulic system of the industrial vehicle machine of FIG. 1.
The application provides an electro-hydraulic steering controllable monostable split-flow type hydraulic system of industrial vehicle machinery, which comprises an oil tank 1, a multi-way valve assembly 4, a steering control valve assembly 6 and a steering oil cylinder 9.
The P port of the multi-way valve assembly 4 is connected with the oil tank 1, the CF port of the multi-way valve assembly 4 is connected with the P port of the steering control valve assembly 6, and the L port and the R port of the steering control valve assembly 6 are respectively connected with the A cavity and the B cavity of the steering oil cylinder 9; further, the steering control valve assembly 6 includes a first reversing valve 61, a second reversing valve 62 and a third reversing valve 63, where the first reversing valve 61 is connected to the P port of the steering control valve assembly 6, that is, the first reversing valve 61 is connected to the CF port of the multiple-way valve assembly 4, the oil inlet of the second reversing valve 62 is connected to the oil outlet of the first reversing valve 61, the oil inlet of the third reversing valve 63 is connected to the oil outlet of the second reversing valve 62, and the oil outlet of the third reversing valve 63 is connected to the L port and the R port of the steering control valve assembly 6, that is, the oil outlet of the third reversing valve 63 is connected to the a cavity and the B cavity of the steering cylinder 9.
Thus, when the system receives the first steering signal, the first steering valve 61 is electrically commutated, and the oil in the oil tank 1 is delivered to the P port of the steering control valve assembly 6 through the multi-way valve assembly 4, and is sequentially delivered to the steering cylinder 9 through the first steering valve 61, the second steering valve 62 and the third steering valve 63, so as to realize steering.
The first steering signal may be a steering signal sent by an electronic steering wheel, or may be a steering signal sent by an unmanned system, and after receiving the steering signal, the hydraulic system may electrically reverse the first reversing valve 61, so as to further implement electrohydraulic steering through the first reversing valve 61, the second reversing valve 62 and the third reversing valve 63.
The system also comprises a steering device 5 and a steering signal valve 7, wherein the steering signal valve 7 is a shuttle valve, the shuttle valve comprises a first oil inlet P1, a second oil inlet P2 and a working port PP, the port P of the steering device 5 is connected with the port P1 of the steering control valve assembly 6, and the port L and the port R of the steering device 5 are respectively connected with the cavity A and the cavity B of the steering cylinder 9; the P1 port and the P2 port of the steering signal valve 7 are respectively connected with the L port and the R port of the steering gear 5, and the PP port of the steering signal valve 7 is connected with the signal port of the second reversing valve 62;
In this way, when the system receives the second steering signal, the pressure signal generated by the steering device 5 is transmitted to the signal port of the second steering valve 62 through the steering signal valve 7, so that the second steering valve 62 is turned, and the oil in the oil tank 1 can be delivered to the port P of the steering control valve assembly 6 through the multi-way valve assembly 4 and then delivered to the steering cylinder 9 through the first steering valve 61, the second steering valve 62 and the steering device 5 in sequence, so as to realize steering.
The second steering signal may be a steering signal obtained by manually operating a mechanical steering wheel when the system is in electrohydraulic steering, and the hydraulic system may electrically commutate the second reversing valve 62 after receiving the steering signal, so that manual preferential steering is further implemented through the first reversing valve 61, the second reversing valve 62 and the steering device 5.
Compared with the traditional hydraulic system which cannot realize automatic control, the hydraulic system provided by the application can realize automatic electrohydraulic steering control on one hand, and can realize manual steering when a mechanical steering wheel is manually operated in the automatic electrohydraulic steering control process on the other hand, and ensure that the priority of the manual steering is higher than that of the automatic electrohydraulic steering control, so that the running safety of a vehicle can be greatly improved.
In this embodiment, the multiway valve assembly 4 includes a monostable diverter valve 41 and a one-way valve 42, where an oil inlet of the monostable diverter valve 41 is connected to the oil tank 1, an oil outlet of the monostable diverter valve 41 is connected to an oil inlet of the one-way valve 42, and an oil outlet of the one-way valve 42 is connected to a P port of the steering control valve assembly 6. The monostable diverter valve 41 is capable of providing a fixed flow of oil to the steering oil passage.
Meanwhile, the system further comprises a power assembly 3, wherein the power assembly 3 is connected with the oil tank 1, and the power assembly 3 is used for supplying the monostable diverter valve 41 after absorbing oil from the oil tank 1. Of course, the power assembly 3 may be embodied as a gear pump.
Of course, according to actual needs, an oil suction filter 2 can be further connected between the power assembly 3 and the oil tank 1, so as to improve the cleanliness of the oil used by the system, and be beneficial to ensuring the reliability of the system operation.
Thus, when the system is started, the gear pump sucks oil from the oil tank 1, oil passes through the oil suction filter 2, is supplied to the multiple-way valve assembly 4, and is supplied to the port P of the steering control valve assembly 6 through the monostable split valve 41 of the multiple-way valve assembly 4.
In addition, the multi-way valve assembly 4 further comprises a relief valve 43, wherein an oil inlet of the relief valve 43 is connected with an oil outlet of the monostable diverter valve 41, and an oil outlet of the relief valve 43 is connected with the oil tank 1. The overflow valve 43 plays a role in safety protection in the system, when the pressure of the system exceeds a specified value, the overflow valve 43 is jacked up, and part of oil in the system is discharged into the oil tank 1, so that the pressure of the system does not exceed an allowable value, and the system is ensured not to have accidents due to the fact that the pressure is too high.
In the present embodiment, the steering control valve assembly 6 further includes a fourth directional valve 64; the signal port of the fourth reversing valve 64 is connected with the signal port of the third reversing valve 63, the oil inlet of the fourth reversing valve 64 is connected with the oil outlet of the second reversing valve 62, and the oil outlet of the fourth reversing valve 64 is connected with the oil tank 1. The fourth reversing valve 64 is used to provide a drain protection when the third reversing valve 63 does not receive a reversing signal but is reversing.
In the steering control valve assembly 6, the first reversing valve 61 is a two-position three-way electromagnetic reversing valve, the second reversing valve 62 is a two-position three-way hydraulic reversing valve, the third reversing valve 63 is a three-position five-way current proportional reversing valve, and the fourth reversing valve 64 is a two-position two-way hydraulic reversing valve.
In order to realize the locking of the steering cylinder 9, a bidirectional hydraulic lock 8 is connected between the steering device 5 and the steering cylinder 9 and between the third reversing valve 63 and the steering cylinder 9, wherein the bidirectional hydraulic lock 8 refers to a bidirectional hydraulic lock 8 with two hydraulic check valves, and the principle is that the two hydraulic check valves take the pressure of the oil way of the other party as pilot oil, and when one pipe has no pressure, the other party is closed at the same time.
When the third reversing valve 63 or the reversing valve in the steering gear 5 is in the middle position, the two hydraulic control one-way valves can be closed, so that the oil liquid in the AB two cavities of the steering oil cylinder 9 can be tightly closed, and at the moment, the piston of the steering oil cylinder 9 cannot move due to the action of external force, so that the stability and the reliability of the system are ensured.
In this embodiment, the T-port of the steering gear 5 is connected to the oil tank 1, so that when the vehicle loses power and oil cannot be provided to the steering gear 5, the steering gear 5 is manually operated to absorb oil from the T-port and supply the oil to the steering cylinder 9 through the internal check valve, so that manual steering of the vehicle without power is achieved. Therefore, when the electrohydraulic steering signal fails or the system fails, the vehicle can still be guaranteed to have a steering function.
In summary, the hydraulic system of the present application may provide three steering modes, the first steering mode being manual steering with no power on the vehicle, the second steering mode being manual steering hydraulic steering, and the third steering mode being automatic electrohydraulic steering.
The first steering mode has the following working states: when the vehicle loses power, the gear pump does not rotate, oil cannot be provided for the steering gear 5, and when the steering wheel is manually operated, the steering gear 5 can absorb oil from a T-port of the steering gear 5 and supply the oil to the steering cylinder 9 through the internal one-way valve, so that manual steering is realized.
The second steering mode has the working state that: manually operating the hydraulic steering, at the moment, the whole vehicle runs, the gear pump absorbs oil from the oil tank 1, the oil is supplied to the monostable diverter valve 41 of the multi-way valve assembly 4 after passing through the oil absorption filter 2, and the CF port of the multi-way valve assembly 4 is connected to the P port of the steering control valve assembly 6, so that the oil is supplied to the P port of the steering control valve assembly 6 after passing through the monostable diverter valve 41 and the one-way valve 42 successively; at this time, the electrohydraulic steering mode is not started, the first reversing valve 61 is not electrified (at the right position), the oil is supplied to the P1 port of the steering control valve assembly 6 after passing through the B port of the first reversing valve 61, and is supplied to the P port of the steering device 5 through the P1 port of the steering control valve assembly 6, and when the steering is performed manually, the oil is supplied to the steering cylinder 9 under the action of the steering device 5 so as to realize steering action; when there is no steering action, the oil will flow back to the oil return passage of the multiplex valve assembly 4 through the T-port of the diverter 5 and back to the oil tank 1.
The third steering mode is an automatic electrohydraulic steering mode: when the electronic steering wheel has a steering signal or the unmanned system sends out the steering signal, electro-hydraulic steering is realized, oil is supplied to the P port of the steering control valve assembly 6 through the monostable diverter valve 41, at the moment, the first reversing valve 61 is subjected to electric reversing (reversing to the left position), oil is supplied to the second reversing valve 62 (in the lower position) through the A port of the first reversing valve 61, and is supplied to the third reversing valve 63 and the fourth reversing valve 64 through the second reversing valve 62, at the moment, because the third reversing valve 63 is controlled by an electric signal (in the left position), reversing oil is supplied to one end of the steering cylinder 9 through the bidirectional hydraulic lock 8, the steering function is realized, and at the moment, the signal port of the third reversing valve 63 has pressure oil to act on the signal port of the fourth reversing valve 64 due to steering action, so that the fourth reversing valve 64 is in the upper position; if the third reversing valve 63 does not receive the steering signal and the third reversing valve 63 reverses, the signal port of the fourth reversing valve 64 does not have pressure oil, the pressure of the oil inlet of the fourth reversing valve 64 rises, and when the pressure exceeds the pressure of the valve control spring, the fourth reversing valve 64 reverses to the lower position, so that the oil is unloaded to the T port, and the safety of the system is ensured.
When the system is in a third steering mode, namely an automatic electrohydraulic steering mode, the manual steering mechanical steering wheel is set to be in manual steering priority through a system oil circuit, and mainly relies on manual steering, a steering pressure signal is acquired through a steering signal valve 7 and is transmitted to a PP port of a steering control valve assembly 6 through the PP port, at the moment, the pressure signal acts on a hydraulic signal port of a second steering valve 62 and causes the second steering valve 62 to be in an upper position, so that even if the electrohydraulic steering signal causes the first steering valve 61 to be in steering, oil is supplied to the steering device 5 through the P1 port of the steering control valve assembly 6 after being supplied to the second steering valve 62, and manual mechanical steering is realized; in addition, even if the third directional valve 63 is energized, the electro-hydraulic steering function is not active at this time because oil cannot be supplied through the second directional valve 62, so that the priority of manual steering is guaranteed to be highest.
Meanwhile, a bidirectional hydraulic lock 8 is connected between the steering device 5 and the steering cylinder 9 and between the third reversing valve 63 and the steering cylinder 9, and the automatic electrohydraulic steering mode and the manual steering priority mode can be isolated through the bidirectional hydraulic lock 8, so that the two working modes are not interfered with each other.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The application provides the monostable shunt type hydraulic system with controllable electrohydraulic steering for industrial vehicle machinery. The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the inventive arrangements and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (7)
1. The electro-hydraulic steering controllable monostable split-flow type hydraulic system of the industrial vehicle machinery is characterized by comprising an oil tank, a multi-way valve assembly, a steering control valve assembly and a steering oil cylinder;
The port P of the multi-way valve assembly is connected with the oil tank, the port CF of the multi-way valve assembly is connected with the port P of the steering control valve assembly, and the port L and the port R of the steering control valve assembly are respectively connected with the cavity A and the cavity B of the steering oil cylinder;
The steering control valve assembly comprises a first steering valve, a second steering valve and a third steering valve, the first steering valve is connected with a P port of the steering control valve assembly, the second steering valve is connected with the first steering valve, the third steering valve is connected with the second steering valve, and the third steering valve is connected with an L port and an R port of the steering control valve assembly;
When the system receives a first steering signal, the first steering valve is electrically commutated, and oil in the oil tank is conveyed to a P port of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first steering valve, the second steering valve and the third steering valve in sequence so as to realize steering;
The system also comprises a steering gear and a steering signal valve, wherein a P port of the steering gear is connected with a P1 port of the steering control valve assembly, and an L port and an R port of the steering gear are respectively connected with an A cavity and a B cavity of the steering oil cylinder; the P1 port and the P2 port of the steering signal valve are respectively connected with the L port and the R port of the steering gear, and the PP port of the steering signal valve is connected with the signal port of the second reversing valve;
when the system receives a second steering signal, the pressure signal generated by the steering device is transmitted to a signal port of the second steering valve through the steering signal valve so as to steer the second steering valve, and oil in the oil tank is transmitted to a P port of the steering control valve assembly through the multi-way valve assembly and is transmitted to the steering oil cylinder through the first steering valve, the second steering valve and the steering device in sequence, so that steering is realized;
the multi-way valve assembly comprises a monostable diverter valve and a one-way valve, an oil inlet of the monostable diverter valve is connected with the oil tank, an oil outlet of the monostable diverter valve is connected with an oil inlet of the one-way valve, and an oil outlet of the one-way valve is connected with a P port of the steering control valve assembly;
the steering control valve assembly further includes a fourth reversing valve;
the signal port of the fourth reversing valve is connected with the signal port of the third reversing valve;
the oil inlet of the fourth reversing valve is connected with the oil outlet of the second reversing valve;
And an oil outlet of the fourth reversing valve is connected with the oil tank.
2. The electro-hydraulic steering controllable monostable split hydraulic system of claim 1 wherein said multi-way valve assembly further comprises a relief valve having an oil inlet connected to an oil outlet of said monostable split valve and an oil outlet connected to said oil tank.
3. The electro-hydraulic steering controllable monostable diverter hydraulic system of an industrial vehicle machine of claim 1, further comprising a power assembly coupled to the tank for supplying the monostable diverter valve after absorbing oil from the tank.
4. The electro-hydraulic steering controllable monostable split hydraulic system of an industrial vehicle machine of claim 3 wherein an oil suction filter is connected between said power assembly and said tank.
5. The electro-hydraulic steering controllable monostable split-flow hydraulic system of an industrial vehicle machine of claim 1, wherein the first reversing valve is a two-position three-way electromagnetic reversing valve, the second reversing valve is a two-position three-way pilot-operated reversing valve, the third reversing valve is a three-position five-way pilot-operated proportional reversing valve, and the fourth reversing valve is a two-position two-way pilot-operated reversing valve.
6. The electro-hydraulic steering controllable monostable split-flow hydraulic system of an industrial vehicle machine of claim 1, wherein a bidirectional hydraulic lock is connected between the steering gear and the steering cylinder, and between the third reversing valve and the steering cylinder.
7. An electro-hydraulic steering controllable monostable split hydraulic system of an industrial vehicle machine according to any one of claims 1-6, wherein the T-port of the steering gear is connected to the tank.
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| CN114198350B true CN114198350B (en) | 2024-08-23 |
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| CN216922658U (en) * | 2022-01-12 | 2022-07-08 | 杭叉集团股份有限公司 | Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunting type hydraulic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE19818111A1 (en) * | 1998-04-23 | 1999-10-28 | Mannesmann Rexroth Ag | Hydraulic steering system for vehicle |
| US8397858B2 (en) * | 2010-06-04 | 2013-03-19 | Eaton Corporation | Hydro-mechanical steering unit with integrated emergency steering capability |
| CN102079332B (en) * | 2010-12-16 | 2013-03-13 | 杭叉集团股份有限公司 | Steering and braking small-flow shared pump hydraulic system |
| CN201962040U (en) * | 2011-02-21 | 2011-09-07 | 安徽合力股份有限公司 | Forklift hydraulic system with functions of priority and unloading |
| CN102678650B (en) * | 2012-06-12 | 2014-12-17 | 浙江海宏液压科技股份有限公司 | Double-pump converging oil-filling valve |
| DE102015121328B3 (en) * | 2015-12-08 | 2017-02-23 | Hydraulik Nord Fluidtechnik Gmbh & Co. Kg | Hydraulic steering device |
| CN208057560U (en) * | 2018-03-21 | 2018-11-06 | 杭叉集团股份有限公司 | A kind of monostable liquid filling integrated valve |
| CN211196345U (en) * | 2019-11-19 | 2020-08-07 | 安徽合力股份有限公司 | Steering system of transverse oil cylinder steering bridge type forklift |
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| CN216922658U (en) * | 2022-01-12 | 2022-07-08 | 杭叉集团股份有限公司 | Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunting type hydraulic system |
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