CN218141754U - Electro-hydraulic control closed-core automatic steering gear - Google Patents
Electro-hydraulic control closed-core automatic steering gear Download PDFInfo
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- CN218141754U CN218141754U CN202222520305.8U CN202222520305U CN218141754U CN 218141754 U CN218141754 U CN 218141754U CN 202222520305 U CN202222520305 U CN 202222520305U CN 218141754 U CN218141754 U CN 218141754U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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Abstract
The utility model discloses an electro-hydraulic control core-closing automatic steering gear, wherein the inlet of a priority valve is communicated with a high-pressure oil source, a CF port of the priority valve is respectively communicated with a core-closing steering unit module and a three-position four-way proportional reversing valve, two working ports of the three-position four-way proportional reversing valve are communicated with a two-position four-way hydraulic control reversing valve, and two oil outlets of the two-position four-way hydraulic control reversing valve are respectively communicated with two oil ports of a mobile mechanical steering oil cylinder; two oil outlets of the closed-core steering unit module are respectively communicated with two oil ports of a steering oil cylinder of the mobile machine; the outlet of the bypass compensator is connected with a load sensing oil port of the core closing steering unit module, the load sensing oil port of the bypass compensator is connected with a pressure switch and a hydraulic control port of the two-position four-way hydraulic control reversing valve, and the pressure switch is electrically connected with the three-position four-way proportional reversing valve. The utility model provides a manual mode and the automatic mode that turns to can turn to manual the turning according to the rotation automatic switch-over of steering wheel under the automatic mode that turns to, and effectively cut off the automatic steering.
Description
Technical Field
The utility model belongs to the technical field of the removal machinery turns to, concretely relates to electric hydraulic control's automatic steering ware of closing core.
Background
Along with the development of non-road mobile machinery intellectualization in agriculture, construction, mining and other industries, the non-road mobile machinery is enabled to be unmanned and has more and more extensive driving assistance application. The automatic steering system based on remote control or other reference object guide reduces the fatigue of drivers on tractors, combine harvesters, corn harvesters and similar non-road mobile machines, improves the comfort of the drivers and improves the working quality. In precision agriculture, a planned operation path in advance ensures that seeds or fertilizers are applied to a field accurate area in accurate quantity, and the combine harvester can optimize the path according to the guidance of crops to realize automatic row alignment. In mining, ore trucks can go from the pit to the heap with greater efficiency. In construction, the grader and the road roller can complete tasks in fewer channels, and compaction precision is improved. In addition, for safety reasons, and because of the conventional tasks that cannot be performed by the control guidance system, it is often desirable for an operator to be able to prioritize control of the vehicle while at the same time being able to easily switch between manual steering and automatic steering. Generally, a steering system such as a tractor using an independent steering pump uses an open core steering gear; steering systems of combine harvesters, engineering machines and the like and steering systems of other working systems sharing a steering pump use a closed-core steering gear.
At present, non-road walking machinery uses a traditional hydraulic steering gear for realizing an automatic steering function, a valve group for automatic steering is additionally arranged outside the hydraulic steering gear, the valve group is connected with the whole steering system through a plurality of additional pipelines, after the non-road walking machinery enters an automatic steering mode, whether a driver steers a steering wheel is controlled through angle change of an angle sensor arranged on a steering column or not is fed back to determine whether the automatic steering function is temporarily closed or not, and the automatic steering function is opened when the angle sensor is unchanged.
In the prior art, redundant pipelines are added, the leakage probability of a hydraulic medium is increased, the fault rate of a system is increased due to an additional angle sensor, the overall structure is not compact enough, and the possibility of pipeline connection errors is increased during installation and maintenance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electricity liquid control's core automatic steering ware that closes for solve the above-mentioned problem that exists among the prior art.
In order to realize the purpose, the utility model adopts the following technical scheme:
an electro-hydraulic control core-closing automatic steering device comprises a core-closing steering unit module and an electro-hydraulic steering valve module which are arranged in parallel, wherein the electro-hydraulic steering valve module comprises a priority valve, a pressure switch, a bypass compensator, a three-position four-way proportional reversing valve and a two-position four-way hydraulic control reversing valve; the left-turning oil outlet of the closed core turning unit module is communicated with one oil port of a turning oil cylinder of the mobile machine, the right-turning oil outlet of the closed core turning unit module is communicated with the other oil port of the turning oil cylinder of the mobile machine, and an oil return port of the closed core turning unit module is communicated with an oil tank of the mobile machine; the inlet of the bypass compensator is communicated with the load sensing oil port of the priority valve, the outlet of the bypass compensator is connected with the load sensing oil port of the core closing steering unit module, the load sensing oil port of the bypass compensator is connected with the pressure switch and the hydraulic control port of the two-position four-way hydraulic control reversing valve, and the pressure switch is electrically connected with the three-position four-way proportional reversing valve.
As an in the utility model discloses in an preferred technical scheme, be provided with the orifice on the pipeline between the load sensing hydraulic fluid port of priority valve and the import of bypass compensator.
As in the utility model discloses in an preferred technical scheme, the load sensing hydraulic fluid port of priority valve passes through the overflow valve intercommunication and removes mechanical oil tank, and the overflow valve is located between the export of orifice and the mechanical oil tank of removal.
As an in the utility model discloses in an preferred technical scheme, electricity liquid diverter valve module still includes electricity liquid diverter valve shell, and priority valve, pressure switch, bypass compensator, tribit four-way proportional reversing valve and two four-way liquid accuse switching-over valves are all installed on electricity liquid diverter valve shell.
As the utility model discloses in a preferred technical scheme, be provided with first hydraulic fluid port on the electricity liquid diverter valve shell, first hydraulic fluid port is linked together with the import of high-pressure oil source and priority valve.
As a preferred technical scheme in the utility model, all be provided with the second hydraulic fluid port on closing core steering unit module and the electro-hydraulic steering valve shell, the second hydraulic fluid port that closes core steering unit module communicates the oil return opening that closes core steering unit module, and the second hydraulic fluid port of electro-hydraulic steering valve shell and the oil return opening that closes core steering unit module, tribit four-way proportional reversing valve and the oil tank of removal machinery all communicate.
As a preferred technical solution in the present invention, the core-closing steering unit module and the electro-hydraulic steering valve housing are both provided with a third oil port, the third oil port of the electro-hydraulic steering valve housing is respectively communicated with the third oil port of the mobile mechanical steering cylinder and the third oil port of the core-closing steering unit module, and the left-turning oil outlet of the core-closing steering unit module is communicated with the third oil port of the core-closing steering unit module; and the fourth oil ports of the core-closing steering unit module and the electro-hydraulic steering valve shell are respectively communicated with the fourth oil ports of the movable mechanical steering oil cylinder and the core-closing steering unit module, and a right rotating oil outlet of the core-closing steering unit module is communicated with the fourth oil port of the core-closing steering unit module.
As an in the utility model discloses in an preferred technical scheme, be provided with the fifth hydraulic fluid port for moving other part fuel supplies of machinery on the electricity liquid steering valve shell, the EF mouth of fifth hydraulic fluid port and priority valve is linked together, and the oil tank of machinery is removed through the plug screw intercommunication to the fifth hydraulic fluid port.
As an in the utility model discloses in an preferred technical scheme, be provided with the sixth hydraulic fluid port on the electro-hydraulic steering valve shell, the sixth hydraulic fluid port is linked together with the load sensing hydraulic fluid port of pressure switch and bypass compensator respectively.
As a preferred technical solution in the present invention, the core-closing steering unit module is provided with a seventh oil port and an eighth oil port, and the seventh oil port is respectively communicated with the CF port of the priority valve and the inlet of the core-closing steering unit module; and the eighth oil port is respectively communicated with an outlet of the bypass compensator and a load sensing oil port of the closed-core steering unit module.
Has the beneficial effects that: the utility model provides a closed core hydraulic steering gear that supplies non-road to remove mechanical hydraulic steering system and use can provide two kinds of functions of manual steering mode and the automatic steering mode of steering wheel manipulation, under the automatic steering mode, can carry out manual steering and automatic steering to the pressure signal of feedback carries out automatic identification and switching that automatic steering and manual steering turn to when turning to with the automation through manual, and can effectively cut off the automatic steering, avoids disturbing.
In the manual steering mode, the machine can only perform steering through a steering wheel, the steering operation of the machine is the same as that of a machine using a common hydraulic steering gear, automatic steering cannot work, and the machine cannot perform steering under the condition that the steering wheel does not rotate.
In an automatic steering mode, when a driver does not rotate a steering wheel under the automatic steering function, the electro-hydraulic control closed-core automatic steering gear allows an electric control system matched with the non-road mobile machinery to convert a guide signal such as an automatic alignment sensor and a linear traveling angle sensor or a displacement sensor into a current signal to be transmitted to a three-position four-way proportional reversing valve through a GPS navigation signal, a remote control signal such as an operating handle, a knob, an electronic steering wheel and the like, and the left position and the right position working states of the three-position four-way proportional reversing valve determine the steering direction, and the magnitude of the input current signal determines the speed of steering.
In an automatic steering mode, when a driver rotates a steering wheel under the manual steering function, the bypass compensator can stop a pressure signal from the priority valve to the steering unit and transmit the sensed pressure signal of the core-closing steering unit module to the two-position four-way hydraulic control reversing valve, and the pressure signal is enough to push the two-position four-way hydraulic control reversing valve to work in a right position to stop the automatic steering action; when the steering wheel does not rotate, the bypass compensator can communicate a pressure signal from the priority valve to the core-closing steering unit module, so that the core-closing steering unit module is in a standby state, the two-position four-way hydraulic control reversing valve works in a left position under the action of a self reset spring, and corresponding steering action can be realized when a signal is input into the three-position four-way proportional reversing valve.
Drawings
FIG. 1 is a connecting diagram of an oil passage of the automatic steering gear with a closed core according to the present invention;
fig. 2 is a schematic structural diagram of the present invention.
In the figure: 1-a closed core steering unit module; 2-an electro-hydraulic steering valve module; 21-a priority valve; 22-orifice; 23-plug screwing; 24-relief valves; 25-a pressure switch; 26-a bypass compensator; 27-a three-position four-way proportional reversing valve; 28-two-position four-way hydraulic control reversing valve; p-a first oil port; t-a second oil port; l-a third oil port; r-a fourth oil port; EF-a fifth oil port; pe-sixth oil port; p1-a seventh oil port; ls-eighth port.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the accompanying drawings is only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without any inventive work. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
Example (b):
as shown in fig. 1 and fig. 2, this embodiment provides an electro-hydraulic controlled closed-core automatic steering gear, which includes a closed-core steering unit module 1 and an electro-hydraulic steering valve module 2 that are arranged in parallel, where the composition of the closed-core steering unit module 1 is substantially the same as that of a conventional closed-core steering unit, and the closed-core steering unit module 1 is adopted and then is connected with the electro-hydraulic steering valve module 2 in a matching manner, in practical application, the closed-core steering unit module 1 implements a manual steering function of steering a steering wheel, and the electro-hydraulic steering valve module 2 implements an automatic steering function under system control.
The electro-hydraulic steering valve module 2 comprises a priority valve 21, a pressure switch 25, a bypass compensator 26, a three-position four-way proportional reversing valve 27 and a two-position four-way hydraulic control reversing valve 28, wherein hydraulic elements are connected with oil ducts in the core-closing automatic steering gear as shown in fig. 1, an inlet of the priority valve 21 is communicated with a high-pressure oil source, a CF port of the priority valve 21 is respectively communicated with an inlet of the core-closing steering unit module 1 and an oil inlet of the three-position four-way proportional reversing valve 27, a left-turn oil outlet of the core-closing steering unit module 1 is communicated with one oil port of a steering oil cylinder of the mobile machine, a right-turn oil outlet of the core-closing steering unit module 1 is communicated with the other oil port of the steering oil cylinder of the mobile machine, and an oil return port of the core-closing steering unit module 1 is communicated with an oil tank of the mobile machine.
In the manual steering mode, the machine can only perform steering through a steering wheel, the steering operation of the machine is the same as that of the machine using a common hydraulic steering gear, automatic steering does not work, and the machine can not perform steering under the condition that the steering wheel does not rotate, specifically, a high-pressure oil source flows into the core-closing steering unit module 1 through the priority valve 21, when steering is not performed, the high-pressure oil source is stopped in the core-closing steering unit module 1, and when the core-closing steering unit module 1 performs left-hand turning or right-hand turning, the high-pressure oil source flows out from a left-hand turning oil outlet or a right-hand turning oil outlet of the core-closing steering unit module 1 and flows to a mobile mechanical steering oil cylinder, so that manual steering is realized.
An oil return port of the three-position four-way proportional reversing valve 27 is communicated with an oil tank of the mobile machine, two working ports of the three-position four-way proportional reversing valve 27 are respectively communicated with an oil inlet of the two-position four-way hydraulic control reversing valve 28, and two oil outlets of the two-position four-way hydraulic control reversing valve 28 are respectively communicated with two oil ports of a steering oil cylinder of the mobile machine, so that a high-pressure oil source is accurately conveyed to the two-position four-way hydraulic control reversing valve 28 according to the left-turn or right-turn condition when the mobile machine automatically steers; the inlet of the bypass compensator 26 is communicated with the load sensing oil port of the priority valve 21, the outlet of the bypass compensator 26 is connected with the load sensing oil port of the core closing steering unit module 1, the load sensing oil port of the bypass compensator 26 is connected with the pressure switch 25 and the hydraulic control port of the two-position four-way hydraulic control reversing valve 28, the two-position four-way hydraulic control reversing valve 28 can be controlled to be closed through oil pressure, the pressure switch 25 can also receive an oil pressure signal, the pressure switch 25 is electrically connected with the three-position four-way proportional reversing valve 27, the three-position four-way proportional reversing valve 27 can be controlled to be closed through an electric signal, and through the structure, the automatic steering mode of the core closing automatic steering device can be realized.
In the automatic steering mode, the automatic steering mode is divided into manual steering and automatic steering, when the steering action is executed, the automatic steering and the manual steering cannot act simultaneously, the priority level of the manual steering is higher than that of the automatic steering, namely, when a driver turns the steering wheel, the automatic steering can be automatically cut off, and when the driver does not sense the turning of the steering wheel, the automatic steering mode is immediately switched to the automatic steering mode.
In the automatic steering mode, when the steering is performed manually, a high-pressure oil source flows into the closed core steering unit module 1 through the priority valve 21, and a part of the high-pressure oil source flows out of a left-turn oil outlet or a right-turn oil outlet of the closed core steering unit module 1 and flows to the mobile mechanical steering oil cylinder to realize manual steering, meanwhile, a part of the high-pressure oil source flows through an outlet of the bypass compensator 26 from a load sensing oil port of the closed core steering unit module 1 and then flows to hydraulic control ports of the pressure switch 25 and the two-position four-way hydraulic control reversing valve 28 from the load sensing oil port of the bypass compensator 26, so that the two-position four-way hydraulic control reversing valve 28 is closed, the pressure switch 25 gives an electric signal to the three-position four-way proportional reversing valve 27 to close the three-position four-way proportional reversing valve, and the stability of manual steering is further ensured.
In the automatic steering mode, when the vehicle is steered automatically, the high-pressure oil source flows into the three-position four-way proportional reversing valve 27 through the priority valve 21, then the three-position four-way proportional reversing valve 27 inputs the high-pressure oil source into the two-position four-way hydraulic control reversing valve 28 according to the steering condition, and the two-position four-way hydraulic control reversing valve 28 transmits the high-pressure oil source to two oil ports of the mobile mechanical steering oil cylinder, so that the automatic steering is realized.
Preferably, a sealing ring is arranged at the pipeline connection position of the closed-core steering unit module 1 and the electro-hydraulic steering valve module 2 to enhance the sealing property.
It should be noted that the utility model discloses can be simple, convenient realize based on GPS navigation or automatic to the driver's assistant who goes with the electrical control cooperation, make GPS navigation, remote control, automatic to going etc. based on the use of electric liquid control's the automatic steering gear of closing the core possible for example electrical control, the sixth hydraulic fluid port Pe of the automatic steering gear of closing the core of electric liquid control can optional dress pressure switch 25 or pressure sensor for gather the pressure control signal of two four-way liquid accuse switching-over valves. The two-position four-way electromagnetic reversing valve with the same performance can replace a two-position four-way hydraulic control reversing valve 28, and the two-position four-way electromagnetic reversing valve is controlled according to an electric signal converted by a pressure switch 25 or a pressure sensor to realize automatic steering and manual priority. The intelligent electronic control may also improve safety by making safe avoidance strategies by predicting potential stability problems or extreme unsafe conditions that the driver overlooked.
The utility model provides a closed core hydraulic steering gear that supplies non-road to remove mechanical hydraulic steering system and use can provide two kinds of functions of manual steering mode and the automatic steering mode of steering wheel manipulation, under the automatic steering mode, can carry out manual steering and automatic steering to the pressure signal of feedback carries out automatic identification and switching that automatic steering and manual steering turn to when turning to with the automation through manual, and can effectively cut off the automatic steering, avoids disturbing.
In the manual steering mode, the machine can only perform steering through a steering wheel, the steering operation of the machine is the same as that of a machine using a common hydraulic steering gear, automatic steering cannot work, and the machine cannot perform steering under the condition that the steering wheel does not rotate.
In the automatic steering mode, when a driver does not rotate a steering wheel under the automatic steering function, the electro-hydraulic control closed-core automatic steering gear allows an electric control system matched with the non-road mobile machinery to convert a guide signal such as an automatic alignment sensor and a linear traveling angle sensor or a displacement sensor into a current signal to be transmitted to the three-position four-way proportional reversing valve 27 through a GPS navigation signal, a remote control signal such as an operating handle, a knob, an electronic steering wheel and the like, and the left position and the right position working states of the three-position four-way proportional reversing valve 27 determine the steering direction, and the magnitude of the input current signal determines the speed of the steering speed.
In the automatic steering mode, when a driver rotates a steering wheel under the manual steering function, the bypass compensator 26 can stop a pressure signal from the priority valve 21 to the steering unit and transmit the sensed pressure signal of the core closing steering unit module 1 to the two-position four-way hydraulic control reversing valve 28, and the pressure signal is enough to push the two-position four-way hydraulic control reversing valve 28 to work in the right position to stop the automatic steering action; when the steering wheel is not rotated, the bypass compensator 26 can communicate the pressure signals from the priority valve 21 to the core closing steering unit module 1, so that the core closing steering unit module 1 is in a standby state, the two-position four-way hydraulic control reversing valve 28 works in the left position under the action of a self return spring, and corresponding steering action can be realized when a signal is input into the three-position four-way proportional reversing valve 27.
As a preferred embodiment in this embodiment, it should be further noted that an orifice 22 is provided in a conduit between the load sensing port of the priority valve 21 and the inlet of the bypass compensator 26, so as to ensure that the bypass compensator 26 operates normally and at the same time, the high-pressure oil source is used for priority supply driving steering.
As a preferred embodiment in this embodiment, it should be further explained that the load sensing port of the priority valve 21 is communicated with the tank of the mobile machine through a relief valve 24, and the relief valve 24 is located between the outlet of the orifice 22 and the tank of the mobile machine. The overflow valve 24 can protect the load sensing port of the priority valve 21 from overload, and the throttle hole 22 can play a throttling effect to ensure that the high-pressure oil source is preferentially supplied to drive the steering to use.
As a preferred implementation scheme in this embodiment, it should be further explained that the electro-hydraulic steering valve module 2 further includes an electro-hydraulic steering valve housing, and the priority valve 21, the pressure switch 25, the bypass compensator 26, the three-position four-way proportional directional valve 27, and the two-position four-way hydraulic control directional valve 28 are all mounted on the electro-hydraulic steering valve housing. Preferably, electricity liquid steering valve shell and electricity liquid steering valve module 2 pass through bolted connection, connect simply and stably, and all hydrovalves all adopt the screw thread cartridge formula, can conveniently maintain and change, can integrate the valve of priority in the integrated configuration group valve of working of group simultaneously, make the core automatic steering ware that closes of electricity liquid control more succinctly small and exquisite.
As a preferred embodiment in this embodiment, it needs to be further described that the housing of the electro-hydraulic steering valve is provided with a first oil port P, and the first oil port P is communicated with the high-pressure oil source and the inlet of the priority valve 21, so that the overall design is more complete, when in use, the high-pressure oil source is only connected, so that oil can be supplied to the whole, and the later operation is simpler.
As a preferred embodiment in this embodiment, it needs to be further explained that the second oil ports T are respectively disposed on the core-closing steering unit module 1 and the housing of the electro-hydraulic steering valve, the second oil port T of the core-closing steering unit module 1 is communicated with the oil return port of the core-closing steering unit module 1, and the second oil port T of the housing of the electro-hydraulic steering valve is communicated with the second oil port T of the core-closing steering unit module 1, the oil return port of the three-position four-way proportional reversing valve 27 and the oil tank of the mobile machine.
As a preferred embodiment in this embodiment, it needs to be further explained that the core-closing steering unit module 1 and the electro-hydraulic steering valve housing are both provided with a third oil port L, the third oil port L of the electro-hydraulic steering valve housing is respectively communicated with the moving mechanical steering oil cylinder and the third oil port L of the core-closing steering unit module 1, and a left-turn oil outlet of the core-closing steering unit module 1 is communicated with the third oil port L of the core-closing steering unit module 1; the fourth oil ports R on the core-closing steering unit module 1 and the electro-hydraulic steering valve shell are respectively communicated with the fourth oil ports R of the moving mechanical steering oil cylinder and the core-closing steering unit module 1, the right-turning oil outlet of the core-closing steering unit module 1 is communicated with the fourth oil port R of the core-closing steering unit module 1, and the whole body is communicated with the moving mechanical steering oil cylinder through the third oil port L and the fourth oil port R of the electro-hydraulic steering valve shell, so that oil supply to the moving mechanical steering oil cylinder during steering can be realized.
As a preferred implementation scheme in this embodiment, it needs to be further described that a fifth oil port EF for supplying oil to other components of the mobile machine is provided on the housing of the electro-hydraulic steering valve, the fifth oil port EF is communicated with the port EF of the priority valve 21, and the fifth oil port EF is communicated with an oil tank of the mobile machine through a plug. The priority valve 21 preferentially supplies oil to drive steering so as to preferentially ensure steering action, thereby providing more guarantee for driving safety, and redundant oil is supplied to the fifth oil port EF for other parts of the system to work.
As a preferred embodiment in this embodiment, it needs to be further explained that a sixth oil port Pe is provided on the housing of the electro-hydraulic steering valve, and the sixth oil port Pe is respectively communicated with the pressure switch 25 and the load sensing oil port of the bypass compensator 26, in short, the pressure switch 25 is installed at the sixth oil port Pe, which facilitates the setting of the pressure switch 25.
As a preferred embodiment in this embodiment, it should be further explained that the core-closing steering unit module 1 is provided with a seventh oil port P1 and an eighth oil port Ls, and the seventh oil port P1 is respectively communicated with the CF port of the priority valve 21 and the inlet of the core-closing steering unit module 1; the eighth oil port Ls is respectively communicated with the outlet of the bypass compensator 26 and the load sensing oil port of the core closing steering unit module 1, and the seventh oil port P1 and the eighth oil port Ls facilitate the communication of the oil passages of the core closing steering unit module 1 and the electro-hydraulic steering valve module 2.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. 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 (10)
1. The electro-hydraulic control core-closing automatic steering gear is characterized by comprising a core-closing steering unit module (1) and an electro-hydraulic steering valve module (2) which are arranged in parallel, wherein the electro-hydraulic steering valve module (2) comprises a priority valve (21), a pressure switch (25), a bypass compensator (26), a three-position four-way proportional reversing valve (27) and a two-position four-way hydraulic control reversing valve (28), an inlet of the priority valve (21) is communicated with a high-pressure oil source, a CF port of the priority valve (21) is respectively communicated with an inlet of the core-closing steering unit module (1) and an oil inlet of the three-position four-way proportional reversing valve (27), an oil return port of the three-position four-way proportional reversing valve (27) is communicated with an oil tank of a mobile machine, two working ports of the three-position four-way proportional reversing valve (27) are respectively communicated with an oil inlet of the two-position four-way hydraulic control reversing valve (28), and two oil outlets of the two-position four-way hydraulic control reversing valve (28) are respectively communicated with two oil ports of the mobile machine steering oil cylinder; a left-turning oil outlet of the closed core steering unit module (1) is communicated with one oil port of a mobile machine steering oil cylinder, a right-turning oil outlet of the closed core steering unit module (1) is communicated with the other oil port of the mobile machine steering oil cylinder, and an oil return port of the closed core steering unit module (1) is communicated with an oil tank of the mobile machine; an inlet of the bypass compensator (26) is communicated with a load sensing oil port of the priority valve (21), an outlet of the bypass compensator (26) is connected with a load sensing oil port of the core closing and turning unit module (1), the load sensing oil port of the bypass compensator (26) is connected with a pressure switch (25) and a hydraulic control port of a two-position four-way hydraulic control reversing valve (28), and the pressure switch (25) is electrically connected with a three-position four-way proportional reversing valve (27).
2. An electro-hydraulically controlled closed core automatic steering gear according to claim 1, characterized in that an orifice (22) is provided in the conduit between the load sensing port of the priority valve (21) and the inlet of the bypass compensator (26).
3. An electro-hydraulically controlled closed-core automatic steering gear according to claim 2, characterized in that the load sensing port of the priority valve (21) communicates with the tank of the mobile machine through an overflow valve (24), the overflow valve (24) being located between the outlet of the orifice (22) and the tank of the mobile machine.
4. The electro-hydraulic control closed-core automatic steering gear according to claim 1, characterized in that the electro-hydraulic steering valve module (2) further comprises an electro-hydraulic steering valve housing, and the priority valve (21), the pressure switch (25), the bypass compensator (26), the three-position four-way proportional directional valve (27) and the two-position four-way hydraulic control directional valve (28) are all mounted on the electro-hydraulic steering valve housing.
5. The electro-hydraulic control closed-core automatic steering gear according to claim 4, characterized in that the electro-hydraulic steering valve housing is provided with a first oil port (P) which is communicated with a high pressure oil source and an inlet of the priority valve (21).
6. The electro-hydraulic control core-closing automatic steering gear according to claim 4, characterized in that the core-closing steering unit module (1) and the electro-hydraulic steering valve housing are both provided with a second oil port (T), the second oil port (T) of the core-closing steering unit module (1) is communicated with an oil return port of the core-closing steering unit module (1), and the second oil port (T) of the electro-hydraulic steering valve housing is communicated with the second oil port (T) of the core-closing steering unit module (1), the oil return port of the three-position four-way proportional reversing valve (27) and an oil tank of the moving machine.
7. The electro-hydraulic control core-closing automatic steering gear according to claim 4, characterized in that the core-closing steering unit module (1) and the electro-hydraulic steering valve housing are both provided with a third oil port (L), the third oil port (L) of the electro-hydraulic steering valve housing is respectively communicated with the third oil port (L) of the moving mechanical steering oil cylinder and the core-closing steering unit module (1), and a left-turning oil outlet of the core-closing steering unit module (1) is communicated with the third oil port (L) of the core-closing steering unit module (1); the core closing steering unit module (1) and the electro-hydraulic steering valve shell are respectively provided with a fourth oil port (R), the fourth oil port (R) of the core closing steering unit module (1) is respectively communicated with the movable mechanical steering oil cylinder and the fourth oil port (R) of the core closing steering unit module (1), and a right rotating oil outlet of the core closing steering unit module (1) is communicated with the fourth oil port (R) of the core closing steering unit module (1).
8. The electro-hydraulic control core-closing automatic steering gear according to claim 4, characterized in that the electro-hydraulic steering valve housing is provided with a fifth oil port (EF) for supplying oil to other parts of the mobile machine, the fifth oil port (EF) is communicated with an EF port of the priority valve (21), and the fifth oil port (EF) is communicated with an oil tank of the mobile machine through a plug.
9. The electro-hydraulic control core-closing automatic steering gear according to claim 4, characterized in that a sixth oil port (Pe) is arranged on the housing of the electro-hydraulic steering valve, and the sixth oil port (Pe) is communicated with the load sensing oil ports of the pressure switch (25) and the bypass compensator (26).
10. The electro-hydraulic control core-closing automatic steering gear according to claim 1, characterized in that the core-closing steering unit module (1) is provided with a seventh oil port (P1) and an eighth oil port (Ls), the seventh oil port (P1) is respectively communicated with the CF port of the priority valve (21) and the inlet of the core-closing steering unit module (1); and the eighth oil port (Ls) is respectively communicated with an outlet of the bypass compensator (26) and a load sensing oil port of the closed-core steering unit module (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222520305.8U CN218141754U (en) | 2022-09-22 | 2022-09-22 | Electro-hydraulic control closed-core automatic steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202222520305.8U CN218141754U (en) | 2022-09-22 | 2022-09-22 | Electro-hydraulic control closed-core automatic steering gear |
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