CN113737873A - Auxiliary steering hydraulic circuit system of land leveler and steering operation method thereof - Google Patents
Auxiliary steering hydraulic circuit system of land leveler and steering operation method thereof Download PDFInfo
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- CN113737873A CN113737873A CN202111052862.5A CN202111052862A CN113737873A CN 113737873 A CN113737873 A CN 113737873A CN 202111052862 A CN202111052862 A CN 202111052862A CN 113737873 A CN113737873 A CN 113737873A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/80—Component parts
- E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/80—Component parts
- E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
- E02F3/841—Devices for controlling and guiding the whole machine, e.g. by feeler elements and reference lines placed exteriorly of the machine
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Abstract
The invention discloses an auxiliary steering hydraulic circuit system of a land leveler and a steering operation method thereof, and belongs to the technical field of engineering machinery. The defect that the working efficiency is low in the control of the front wheel steering wheel of the traditional land leveller in the prior art is overcome. The main structure of the steering pump comprises an electric control operation auxiliary steering valve block, a steering gear, a priority valve and a steering pump, wherein an oil outlet of the steering pump is connected with a port P of the priority valve, a port CF of the priority valve is respectively connected with a port P2 of the electric control operation auxiliary steering valve block and a port P1 of the steering gear, and a port LS of the electric control operation auxiliary steering valve block is connected with a port LS1 of the priority valve. The invention is mainly used for engineering machinery such as land levelers and the like.
Description
The technical field is as follows:
the invention belongs to the technical field of engineering machinery, and particularly relates to an auxiliary steering hydraulic circuit system of a land leveler and a steering operation method thereof.
Background art:
the land leveler is generally provided with two modes of articulated steering and front wheel steering, the articulated steering is controlled by a multi-way valve, the steering is integrated on a control handle, the articulated steering of a front frame and a rear frame is realized by pulling the control handle back and forth, and the steering with smaller turning radius can be realized. The front wheel steering is controlled by a steering gear and controlled by a steering wheel, so that the operation habit of people is met, and the front wheel steering is the main steering mode of the land leveler.
However, the mode of controlling the hinged steering handle and the front wheel steering wheel is adopted, and when the front wheel steering device works, if the front wheel steering device wants to steer, the front wheel steering device needs to be moved from the handle operation to the steering wheel operation, so that the working efficiency is reduced.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provides an auxiliary steering hydraulic circuit system of a land leveler and a steering operation method thereof.
In order to realize the purpose, the invention is realized by adopting the following technical scheme:
the hydraulic circuit system for auxiliary steering of the land leveler comprises an electric control operation auxiliary steering valve block, a steering gear, a priority valve and a steering pump, wherein an oil outlet of the steering pump is connected with a port P of the priority valve, a port CF of the priority valve is respectively connected with a port P2 of the electric control operation auxiliary steering valve block and a port P1 of the steering gear, and a port LS of the electric control operation auxiliary steering valve block is connected with a port LS1 of the priority valve.
Preferably, the land scraper auxiliary steering hydraulic circuit system comprises an emergency steering pump which is respectively connected with a port P2 of the electric control steering auxiliary valve block and a port P1 of the steering gear.
Preferably, a pilot-controlled check valve is arranged between the LS port of the electric control operation auxiliary steering valve block and the LS1 port of the priority valve, and the pilot-controlled check valve is further connected with an oil outlet of the steering pump.
Preferably, the land scraper auxiliary steering hydraulic circuit system further comprises pressure switches which are respectively connected with the Pp port of the electric control steering auxiliary valve block and the LS2 port of the steering gear.
Preferably, a check valve is arranged at the CF port of the priority valve, and the oil outlet of the check valve is respectively connected with the P2 port of the electric control operation auxiliary steering valve block and the P1 port of the steering gear.
Preferably, the port A of the electric control operation auxiliary steering valve block is connected with one cavity of the steering oil cylinder, and the port B is connected with the other cavity of the steering oil cylinder.
Preferably, the electrically-controlled steering assisting valve block comprises a first reversing valve, a second reversing valve, a shuttle valve, a hydraulic control overflow valve, a third reversing valve, a fourth reversing valve and a valve body, wherein the first reversing valve is respectively connected with a port P2 on the valve body, the second reversing valve, a port LS4 of the shuttle valve and the hydraulic control overflow valve, the third reversing valve is respectively connected with a port A1 on the second reversing valve, a port A on the valve body and a port LS3 on the shuttle valve, the fourth reversing valve is respectively connected with a port B1 on the second reversing valve, a port B on the valve body and a port LS3 of the shuttle valve, a port LS5 of the shuttle valve is communicated with a port LS on the valve body, and a port Pp on the valve body is also respectively connected with a signal end on one side of the third reversing valve and a signal end on one side of the fourth reversing valve.
A steering operation method adopts the land scraper auxiliary steering hydraulic circuit system, and specifically comprises the following steps: the operation method of the steering pump in normal work and the operation method of the emergency steering pump in work when the steering pump can not work normally.
Preferably, the operation method of the steering pump in normal operation is as follows:
A. when the steering pump works, the steering gear performs steering operation or both the steering gear and the electric control auxiliary steering are operated, the LS2 port pressure of the steering gear is not zero, the pressure switch enables the Y1 on the first reversing valve to be powered off, the first reversing valve works on the left position, oil-free liquid enters the electric control auxiliary steering valve block, the LS5 port pressure of the shuttle valve is obtained from the LS2 port pressure of the steering gear, the numerical value is larger, the LS1 port pressure of the priority valve is larger, the valve core of the priority valve moves to the left, the oil of the steering pump completely enters a mechanical steering loop through the CF port of the priority valve, mechanical steering is realized, and at the moment, the land leveler cannot work and only can perform mechanical steering;
B. when the steering pump works and only controls the electric control auxiliary steering, the left position or the right position of the second reversing valve works, the pressure of an LS2 port of the steering gear is zero, the pressure switch enables Y1 on the first reversing valve to be electrified, the right position of the first reversing valve works, oil enters an electric control operation auxiliary steering valve block, the pressure of an LS5 port of the shuttle valve is obtained from the outlet pressure of the first reversing valve, the numerical value is larger, the pressure of an LS1 port of the priority valve is larger, a valve core of the priority valve moves leftwards, and the oil of the steering pump completely enters the electric control operation auxiliary steering valve block through a CF port of the priority valve to realize the electric control auxiliary steering;
C. when the steering pump works and the steering gear and the electric control auxiliary steering are not operated, the pressure of an LS2 port of the steering gear is zero, a pressure switch enables Y1 on the first reversing valve to be electrified, the right position of the first reversing valve works, oil enters an electric control operation auxiliary steering valve block, the oil of the steering pump returns oil through the right position of the first reversing valve, the middle position of the second reversing valve and a hydraulic control overflow valve, the pressure of an LS5 port of the shuttle valve is zero, the pressure of an LS1 port of the priority valve is zero, a valve core of the priority valve moves to the right, the oil of the steering pump enters a working oil way through an EF port of the priority valve, and the grader can work.
Preferably, the operation method of the emergency steering pump when the steering pump cannot normally work is as follows:
D. when the steering pump does not work and the emergency steering pump works, the one-way valve is closed and oil-free liquid passes through the priority valve, when the steering gear performs steering operation or the steering gear and the electric control auxiliary steering are operated, the pressure of an LS2 port of the steering gear is not zero, the pressure switch enables the power of Y1 on the first reversing valve to be cut off, the first reversing valve works at the left position, the oil-free liquid enters the electric control auxiliary steering valve block, all oil liquid of the emergency steering pump enters a mechanical steering loop to realize mechanical steering, and at the moment, the land leveler cannot work and only can perform mechanical steering;
E. when the steering pump does not work and the emergency steering pump works, the one-way valve is closed, oil does not pass through the priority valve, when only the electric control auxiliary steering is operated, the left position or the right position of the second reversing valve works, the pressure of an LS2 port of the steering gear is zero, the pressure switch enables Y1 on the first reversing valve to be electrified, the right position of the first reversing valve works, the oil enters the electric control operation auxiliary steering valve block, all the oil of the emergency steering pump enters the electric control operation auxiliary steering valve block, the electric control auxiliary steering is realized, and at the moment, the grader cannot work and only can carry out the electric control auxiliary steering;
F. the steering pump is out of work, emergent steering pump during operation, the check valve is closed and does not have oil and pass through the priority valve, when steering gear and automatically controlled auxiliary steering all do not operate, LS2 mouth pressure of steering gear is zero, pressure switch makes the Y1 on the first switching-over valve circular telegram, the work of first switching-over valve right side position, fluid gets into the automatically controlled auxiliary steering valve piece of controlling, the fluid of emergent steering pump is through first switching-over valve right side position, second switching-over valve meso position and hydraulic control overflow valve oil return, the leveler can not work.
Compared with the prior art, the invention has the beneficial effects that:
1. the auxiliary steering valve block is controlled by the electric control, so that the steering can be realized by controlling the steering wheel, the steering can also be realized by the control handle, the switching from the work to the steering of the land leveler is more convenient, and the mechanical steering is prior to the auxiliary steering, so that the working efficiency is improved, and the driving safety is ensured;
2. the emergency steering pump is matched, when the steering pump cannot work normally, the emergency steering pump can be used for steering, and the safety performance of the whole vehicle is improved.
Description of the drawings:
FIG. 1 is a hydraulic schematic of the present invention;
FIG. 2 is a hydraulic schematic diagram of an electrically controlled steering assist valve block according to the present invention;
FIG. 3 is a front view of an electrically controlled steering assist valve block of the present invention;
FIG. 4 is a left side view of the electrically controlled steering assist valve block of the present invention;
FIG. 5 is a top view of an electronically controlled auxiliary steering valve block of the present invention;
FIG. 6 is a block diagram of the flow of the steering pump of the present invention during normal operation;
fig. 7 is a block diagram illustrating the operation of the emergency steering pump when the steering pump of the present invention is not operating normally.
In the figure: 1. an electrically controlled steering assist valve block; 2. a diverter; 3. a priority valve; 4. a hydraulic control check valve; 5. a one-way valve; 6. a pressure switch; 7. an emergency steering pump; 8. a steering pump; 9. a steering cylinder; 10. a hydraulic oil tank; 101. a first direction changing valve; 102. a second directional control valve; 103. a shuttle valve; 104. a hydraulic control overflow valve; 105. a third directional control valve; 106. a fourth directional control valve; 107. a valve body.
The specific implementation mode is as follows:
the invention is further illustrated by the following specific examples in combination with the accompanying drawings.
Example 1:
as shown in fig. 1-5, the hydraulic circuit system for auxiliary steering of a land scraper comprises an electric control operation auxiliary steering valve block 1, a steering gear 2, a priority valve 3 and a steering pump 8, wherein an oil outlet of the steering pump 8 is connected with a port P of the priority valve 3, a port CF of the priority valve 3 is respectively connected with a port P2 of the electric control operation auxiliary steering valve block 1 and a port P1 of the steering gear 2, a port LS of the electric control operation auxiliary steering valve block 1 is connected with a port LS1 of the priority valve 3, and a port EF of the priority valve 3 is connected with a port P3 of a multi-way valve. Through turning to the front wheel on integrated automatically controlled operating handle for the front wheel turns to both can be through handle control, can pass through steering wheel control again, and steering wheel control is preferred simultaneously, makes the during operation if think the front wheel and turn to, can the direct operating handle, has greatly made things convenient for the operator, has improved work efficiency, and the front wheel turns to steering wheel is preferred simultaneously, has guaranteed the security of driving again.
Example 2:
a land scraper auxiliary steering hydraulic circuit system comprises an emergency steering pump 7, wherein the emergency steering pump 7 is respectively connected with a port P2 of an electric control operation auxiliary steering valve block 1 and a port P1 of a steering gear 2.
A hydraulic control one-way valve 4 is arranged between the LS port of the electric control operation auxiliary steering valve block 1 and the LS1 port of the priority valve 3, and the hydraulic control one-way valve 4 is also connected with an oil outlet of a steering pump 8.
The land scraper auxiliary steering hydraulic circuit system also comprises a pressure switch 6, and the pressure switch 6 is respectively connected with a Pp port of the electric control operation auxiliary steering valve block 1 and an LS2 port of the steering gear 2.
A check valve 5 is arranged at a CF port of the priority valve 3, and an oil outlet of the check valve 5 is respectively connected with a P2 port of the electric control operation auxiliary steering valve block 1 and a P1 port of the steering gear 2.
The port A of the electric control operation auxiliary steering valve block 1 is connected with a rodless cavity of the steering oil cylinder 9, and the port B is connected with a rod cavity of the steering oil cylinder 9.
The electrically-controlled steering assisting valve block 1 comprises a first reversing valve 101, a second reversing valve 102, a shuttle valve 103, a pilot-controlled overflow valve 104, a third reversing valve 105, a fourth reversing valve 106 and a valve body 107, wherein the first reversing valve 101 is respectively connected with a P2 port on the valve body 107, the second reversing valve 102, an LS4 port of the shuttle valve 103 and the pilot-controlled overflow valve 104, the third reversing valve 105 is respectively connected with an A1 port on the second reversing valve 102, an A port on the valve body 107 and an LS3 port of the shuttle valve 103, the fourth reversing valve 106 is respectively connected with a B1 port on the second reversing valve 102, a B port on the valve body 107 and an LS3 port of the shuttle valve 103, an LS5 port of the shuttle valve 103 is communicated with the LS port on the valve body 107, and Pp ports on the valve body 107 are respectively connected with a signal end on one side of the third reversing valve 105 and a signal end on one side of the fourth reversing valve 106. The pilot operated relief valve 104 communicates with a T port on the valve body 107, which is connected back to the hydraulic tank 10. The first reversing valve 101, the third reversing valve 105 and the fourth reversing valve 106 are two-position two-way electromagnetic reversing valves, and the second reversing valve 102 is a three-position four-way electromagnetic reversing valve. The other portions are the same as in example 1.
The first reversing valve 101 is a two-position two-way valve and is used for controlling whether oil enters an electric control operation auxiliary steering loop or not, namely, whether the electric control operation auxiliary steering is in effect or not is controlled, the second reversing valve 102 is a three-position four-way valve, the third reversing valve 105 and the fourth reversing valve 106 are used for controlling the steering direction together, the shuttle valve 103 only needs to operate the electric control auxiliary steering or the mechanical steering, the pressure of an output LS5 port is not 0, and when the steering is not operated, the pressure of an output LS5 is 0; the hydraulic control overflow valve 104 is used for realizing oil return of the electric control auxiliary steering valve block 1. The hydraulic control one-way valve 4 has the effects that when the steering pump 8 works normally, the hydraulic control one-way valve 4 is normally opened, the LS5 port pressure of the electric control operation auxiliary steering valve block 1 is led to the LS1 position of the priority valve 3, when the steering pump 8 does not work, the hydraulic control one-way valve 4 is closed, the priority valve 3 does not work, and the emergency steering pump 7 can only control steering and cannot realize other actions of the land leveler. The check valve 5 is used for preventing oil from flowing backwards when the steering wheel works or turns. The pressure switch 6 is used for enabling the pressure of an LS2 oil port of the steering gear 2 to be 0 when the mechanical steering is not operated, the pressure switch 6 enables the Y1 to be electrified, and the first reversing valve 101 is located at the right position, so that oil can enter the electric control operation auxiliary steering valve block 1; when the mechanical steering is operated, the pressure of an LS2 port of the steering gear 2 is not 0, the pressure switch 6 cuts off the power of the Y1, the first reversing valve 101 is located at the left position, so that oil cannot enter the electric control operation auxiliary steering valve block 1, the electric control operation auxiliary steering is not effective at the moment, and the priority of the mechanical steering relative to the electric control operation auxiliary steering can be realized.
Example 3:
a steering operation method using the motor grader auxiliary steering hydraulic circuit system according to embodiment 2, specifically comprising: the operation method when the steering pump 8 is normally operated and the operation method when the emergency steering pump 7 is operated when the steering pump 8 cannot be normally operated.
As shown in fig. 6, the operation method of the steering pump 8 in normal operation is as follows:
A. when the steering pump 8 works, the steering gear 2 performs steering operation or both the steering gear 2 and the electric control auxiliary steering are operated, the pressure of an LS2 port of the steering gear 2 is not zero, the pressure switch 6 enables the Y1 on the first reversing valve 101 to be powered off, the first reversing valve 101 works in the left position, oil-free liquid enters the electric control auxiliary steering valve block 1, the pressure of an LS5 port of the shuttle valve 103 is obtained from the pressure of an LS2 port of the steering gear 2, the value is larger, the pressure of an LS1 port of the priority valve 3 is larger, a valve core of the priority valve 3 moves leftwards, the oil of the steering pump 8 completely enters a mechanical steering circuit through a CF port of the priority valve 3, mechanical steering is achieved, and at the moment, the land leveler cannot work and only can perform mechanical steering;
B. when the steering pump 8 works and only controls the electric control auxiliary steering, the left position or the right position of the second reversing valve 102 works, the pressure of an LS2 port of the steering gear 2 is zero, the pressure switch 6 enables the Y1 on the first reversing valve 101 to be electrified, the right position of the first reversing valve 101 works, oil enters the electric control auxiliary steering valve block 1, the pressure of an LS5 port of the shuttle valve 103 is obtained from the outlet pressure of the first reversing valve 101, the value is larger, the pressure of an LS1 port of the priority valve 3 is larger, a valve core of the priority valve 3 moves leftwards, the oil of the steering pump 8 completely enters the electric control auxiliary steering valve block 1 through a CF port of the priority valve 3, the electric control auxiliary steering is realized, and at the moment, the land leveler cannot work and only can control the electric control auxiliary steering;
C. when the steering pump 8 works and the steering gear 2 and the electric control auxiliary steering do not operate, the pressure of an LS2 port of the steering gear 2 is zero, the pressure switch 6 enables the Y1 on the first reversing valve 101 to be electrified, the right position of the first reversing valve 101 works, oil enters the electric control operation auxiliary steering valve block 1, the oil of the steering pump 8 returns oil through the right position of the first reversing valve 101, the middle position of the second reversing valve 102 and the hydraulic control overflow valve 104, the pressure of an LS5 port of the shuttle valve 103 is zero, the pressure of an LS1 port of the priority valve 3 is zero, a valve core of the priority valve 3 moves to the right, the oil of the steering pump 8 enters a working oil way through an EF port of the priority valve 3, and the grader can work.
As shown in fig. 7, the operation method of the emergency steering pump 7 when the steering pump 8 cannot normally operate is as follows:
D. when the steering pump 8 does not work and the emergency steering pump 7 works, the one-way valve 5 is closed and oil-free liquid passes through the priority valve 3, when the steering gear 2 performs steering operation or the steering gear 2 and the electric control auxiliary steering are operated, the pressure of an LS2 port of the steering gear 2 is not zero, the pressure switch 6 enables the Y1 on the first reversing valve 101 to be powered off, the first reversing valve 101 works at the left position, oil-free liquid enters the electric control auxiliary steering valve block 1, all oil liquid of the emergency steering pump 7 enters a mechanical steering loop to realize mechanical steering, and at the moment, the grader cannot work and only can perform mechanical steering;
E. when the steering pump 8 does not work and the emergency steering pump 7 works, the one-way valve 5 is closed, oil does not pass through the priority valve 3, only the electric control auxiliary steering is operated, the left position or the right position of the second reversing valve 102 works, the pressure of an LS2 port of the steering gear 2 is zero, the pressure switch 6 enables the Y1 on the first reversing valve 101 to be electrified, the right position of the first reversing valve 101 works, oil enters the electric control operation auxiliary steering valve block 1, all the oil of the emergency steering pump 7 enters the electric control operation auxiliary steering valve block 1, the electric control auxiliary steering is realized, and at the moment, the grader cannot work and only the electric control auxiliary steering is realized;
F. the steering pump 8 does not work, the emergency steering pump 7 during operation, the check valve 5 is closed and there is not oil to pass through the priority valve 3, when steering gear 2 and automatically controlled auxiliary steering do not all operate, LS2 mouth pressure of steering gear 2 is zero, pressure switch 6 makes the Y1 on the first switching-over valve 101 circular telegram, the work of first switching-over valve 101 right side position, fluid gets into automatically controlled operation auxiliary steering valve piece 1, the fluid of emergency steering pump 7 is through first switching-over valve 101 right side position, second switching-over valve 102 meso position and hydraulic control overflow valve 104 oil return, the leveler can not work.
Claims (10)
1. A land leveler assists and turns to hydraulic circuit system which characterized in that: the automatic control steering system comprises an electric control operation auxiliary steering valve block (1), a steering gear (2), a priority valve (3) and a steering pump (8), wherein an oil outlet of the steering pump (8) is connected with a P port of the priority valve (3), a CF port of the priority valve (3) is respectively connected with a P2 port of the electric control operation auxiliary steering valve block (1) and a P1 port of the steering gear (2), and an LS port of the electric control operation auxiliary steering valve block (1) is connected with an LS1 port of the priority valve (3).
2. The grader assisted steering hydraulic circuit system according to claim 1, wherein: the land scraper auxiliary steering hydraulic circuit system comprises an emergency steering pump (7), wherein the emergency steering pump (7) is respectively connected with a P2 port of an electric control operation auxiliary steering valve block (1) and a P1 port of a steering gear (2).
3. The grader assisted steering hydraulic circuit system according to claim 2, wherein: and a hydraulic control one-way valve (4) is arranged between the LS port of the electric control operation auxiliary steering valve block (1) and the LS1 port of the priority valve (3), and the hydraulic control one-way valve (4) is also connected with an oil outlet of a steering pump (8).
4. The grader assisted steering hydraulic circuit system according to claim 3, wherein: the land scraper auxiliary steering hydraulic circuit system also comprises a pressure switch (6), and the pressure switch (6) is respectively connected with a Pp port of the electric control operation auxiliary steering valve block (1) and an LS2 port of the steering gear (2).
5. The grader assisted steering hydraulic circuit system according to claim 4, wherein: a CF port of the priority valve (3) is provided with a one-way valve (5), and an oil outlet of the one-way valve (5) is respectively connected with a P2 port of the electric control operation auxiliary steering valve block (1) and a P1 port of the steering gear (2).
6. The grader assisted steering hydraulic circuit system of claim 5, wherein: the port A of the electric control operation auxiliary steering valve block (1) is connected with one cavity of the steering oil cylinder (9), and the port B is connected with the other cavity of the steering oil cylinder (9).
7. The grader assisted steering hydraulic circuit system of claim 6, wherein: the electric control operation auxiliary steering valve block (1) comprises a first reversing valve (101), a second reversing valve (102), a shuttle valve (103), a hydraulic control overflow valve (104), a third reversing valve (105), a fourth reversing valve (106) and a valve body (107), the first reversing valve (101) is respectively connected with a P2 port on the valve body (107), the second reversing valve (102), an LS4 port of the shuttle valve (103) and a hydraulic control overflow valve (104), the third reversing valve (105) is respectively connected with the port A1 of the second reversing valve (102), the port A of the valve body (107) and the port LS3 of the shuttle valve (103), the fourth reversing valve (106) is respectively connected with the port B1 of the second reversing valve (102), the port B of the valve body (107) and the port LS3 of the shuttle valve (103), the port LS5 of the shuttle valve (103) is communicated with the port LS of the valve body (107), and the ports Pp of the valve body (107) are respectively connected with a signal end on one side of the third reversing valve (105) and a signal end on one side of the fourth reversing valve (106).
8. A steering operation method characterized by: the motor grader auxiliary steering hydraulic circuit system according to claim 7 is adopted, and specifically comprises: an operation method when the steering pump (8) normally works and an operation method when the emergency steering pump (7) works when the steering pump (8) cannot normally work.
9. The steering operation method according to claim 8, characterized in that: the operation method of the steering pump (8) in normal work comprises the following steps:
A. when a steering pump (8) works, the steering gear (2) performs steering operation or both the steering gear (2) and electric control auxiliary steering are operated, the LS2 port pressure of the steering gear (2) is not zero, a pressure switch (6) enables the Y1 on a first reversing valve (101) to be powered off, the first reversing valve (101) works in the left position, oil-free liquid enters an electric control auxiliary steering valve block (1), the LS5 port pressure of a shuttle valve (103) is obtained from the LS2 port pressure of the steering gear (2), the numerical value is large, the LS1 port pressure of a priority valve (3) is large, a valve core of the priority valve (3) moves leftwards, oil of the steering pump (8) completely enters a mechanical steering loop through a CF port of the priority valve (3), mechanical steering is achieved, and at the moment, a grader cannot work and only can perform mechanical steering;
B. when a steering pump (8) works and only controls electric control auxiliary steering, a second reversing valve (102) works at the left position or the right position, the LS2 port pressure of a steering gear (2) is zero, a pressure switch (6) enables Y1 on a first reversing valve (101) to be electrified, the first reversing valve (101) works at the right position, oil enters an electric control operation auxiliary steering valve block (1), the LS5 port pressure of a shuttle valve (103) is obtained from the outlet pressure of the first reversing valve (101), the numerical value is large, the LS1 port pressure of a priority valve (3) is large, a valve core of the priority valve (3) moves leftwards, the oil of the steering pump (8) completely enters the electric control operation auxiliary steering valve block (1) through a CF port of the priority valve (3), the electric control auxiliary steering is realized, at the moment, a grader cannot work, and only the electric control auxiliary steering can be realized;
C. when a steering pump (8) works and a steering gear (2) and an electric control auxiliary steering do not operate, the pressure of an LS2 port of the steering gear (2) is zero, a pressure switch (6) enables Y1 on a first reversing valve (101) to be electrified, the right position of the first reversing valve (101) works, oil enters an electric control operation auxiliary steering valve block (1), the oil of the steering pump (8) returns oil through the right position of the first reversing valve (101), the middle position of a second reversing valve (102) and a hydraulic control overflow valve (104), the pressure of an LS5 port of a shuttle valve (103) is zero, the pressure of an LS1 port of a priority valve (3) is zero, a valve core of the priority valve (3) moves to the right, the oil of the steering pump (8) enters a working oil way through an EF port of the priority valve (3), and a grader can work.
10. The steering operation method according to claim 8, characterized in that: the operation method of the emergency steering pump (7) when the steering pump (8) can not work normally comprises the following steps:
D. when the steering pump (8) does not work and the emergency steering pump (7) works, the one-way valve (5) is closed and oil-free liquid passes through the priority valve (3), when the steering gear (2) performs steering operation or the steering gear (2) and the electric control auxiliary steering are both operated, the pressure of an LS2 port of the steering gear (2) is not zero, the pressure switch (6) enables the Y1 on the first reversing valve (101) to be powered off, the first reversing valve (101) works on the left side, oil-free liquid enters the electric control auxiliary steering valve block (1), all oil of the emergency steering pump (7) enters a mechanical steering loop to realize mechanical steering, and at the moment, the grader cannot work and only can perform mechanical steering;
E. when the steering pump (8) does not work and the emergency steering pump (7) works, the one-way valve (5) is closed, oil does not pass through the priority valve (3), when only the electric control auxiliary steering is operated, the left position or the right position of the second reversing valve (102) works, the pressure of an LS2 port of the steering gear (2) is zero, the pressure switch (6) enables the Y1 on the first reversing valve (101) to be electrified, the right position of the first reversing valve (101) works, the oil enters the electric control auxiliary steering valve block (1), all the oil of the emergency steering pump (7) enters the electric control auxiliary steering valve block (1), the electric control auxiliary steering is realized, at the moment, the land leveler cannot work and only can carry out the electric control auxiliary steering;
F. steering pump (8) are out of work, emergent steering pump (7) during operation, check valve (5) are closed and do not have oil and pass through priority valve (3), when steering gear (2) and automatically controlled supplementary steering do not all operate, LS2 mouth pressure of steering gear (2) is zero, pressure switch (6) make the Y1 circular telegram on first switching-over valve (101), first switching-over valve (101) right side position work, fluid gets into automatically controlled manipulation auxiliary steering valve piece (1), the fluid of emergent steering pump (7) is through first switching-over valve (101) right side position, second switching-over valve (102) meso position and hydraulically controlled overflow valve (104) oil return, the leveler can not work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111052862.5A CN113737873B (en) | 2021-09-07 | 2021-09-07 | Land leveler auxiliary steering hydraulic circuit system and steering operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111052862.5A CN113737873B (en) | 2021-09-07 | 2021-09-07 | Land leveler auxiliary steering hydraulic circuit system and steering operation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113737873A true CN113737873A (en) | 2021-12-03 |
| CN113737873B CN113737873B (en) | 2023-03-17 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400476A (en) * | 2011-10-28 | 2012-04-04 | 山河智能装备股份有限公司 | Hydraulic circuit controlling preferred movement of moveable arm to lift or rotate |
| CN102518170A (en) * | 2011-12-27 | 2012-06-27 | 四川大学 | Hydraulic system of loading machine working device |
| WO2015043377A1 (en) * | 2013-09-24 | 2015-04-02 | 三一汽车制造有限公司 | Auxiliary hydraulic system and concrete pumping device |
| CN108824544A (en) * | 2018-07-24 | 2018-11-16 | 徐州徐工筑路机械有限公司 | A kind of level land Electrical Control double handle control system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400476A (en) * | 2011-10-28 | 2012-04-04 | 山河智能装备股份有限公司 | Hydraulic circuit controlling preferred movement of moveable arm to lift or rotate |
| CN102518170A (en) * | 2011-12-27 | 2012-06-27 | 四川大学 | Hydraulic system of loading machine working device |
| WO2015043377A1 (en) * | 2013-09-24 | 2015-04-02 | 三一汽车制造有限公司 | Auxiliary hydraulic system and concrete pumping device |
| CN108824544A (en) * | 2018-07-24 | 2018-11-16 | 徐州徐工筑路机械有限公司 | A kind of level land Electrical Control double handle control system |
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| CN113737873B (en) | 2023-03-17 |
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