CN210760964U - Digital control hydraulic steering system of loader - Google Patents
Digital control hydraulic steering system of loader Download PDFInfo
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- CN210760964U CN210760964U CN201921716371.4U CN201921716371U CN210760964U CN 210760964 U CN210760964 U CN 210760964U CN 201921716371 U CN201921716371 U CN 201921716371U CN 210760964 U CN210760964 U CN 210760964U
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Abstract
The utility model relates to a loader hydraulic pressure turns to technical field, specifically is a loader digital control hydraulic pressure steering system, including the oil tank, the gear pump, the electromagnetic directional valve, first steering cylinder, the second steering cylinder, the oil return branch road, the steering column, encoder and programmable controller, the oil inlet of gear pump and the oil absorption mouth fluid connection of oil tank, the oil-out of gear pump and the oil inlet fluid connection of electromagnetic directional valve, programmable controller's input and encoder circuit connection, encoder fixed mounting is on the steering column, programmable controller's the output and the control circuit of electromagnetic directional valve are connected. The utility model has the advantages that: the steering system is controlled by an encoder and a Programmable Logic Controller (PLC) computer, so that the steering precision is improved, and the operating force is small; when the loader travels and does not turn, the hydraulic oil output by the gear pump is converged with the hydraulic working system for the working system to use, and no-load circulation is avoided, so that a large amount of energy is saved, and the energy-saving effect is good.
Description
Technical Field
The utility model relates to a loader hydraulic pressure turns to technical field, specifically is a loader digital control hydraulic steering system.
Background
The loader is an earth and rockwork construction machine widely used in the construction industry, the foundation construction and the like, and the hydraulic steering system of the loader has the function of controlling the running direction of the loader, so that the loader stably keeps straight running and can flexibly change the running direction according to requirements. The traditional hydraulic steering system of the loader mainly adopts the following forms according to the tonnage of the loader: the hydraulic constant-current steering system, the load sensing hydraulic steering system and the flow amplifying steering system have the common defect that when the loader runs and does not steer, the steering system is large in no-load circulating throttling and wastes energy. With the development of a digital control hydraulic system, a digital control hydraulic steering system is adopted on the loader to accurately control the steering of the loader, so that the problem of large energy waste when the loader is not steered during walking is solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a loader digital control hydraulic steering system turns to the loader and carries out accurate control to overcome the loader walking that proposes among the above-mentioned background art and do not turn to the big problem of energy waste when turning to.
In order to achieve the above object, the utility model provides a following technical scheme:
a digital control hydraulic steering system of a loader comprises an oil tank, a gear pump, an electromagnetic reversing valve, a first steering oil cylinder, a second steering oil cylinder, an oil return branch, a steering column, an encoder and a programmable controller, wherein an oil inlet of the gear pump is in fluid connection with an oil inlet of the oil tank, an oil outlet of the gear pump is in fluid connection with an oil inlet P of the electromagnetic reversing valve, an oil outlet O of the electromagnetic reversing valve is in fluid connection with the oil return branch, the tail end of the oil return branch is in fluid connection with an oil return port of the oil tank, a first working oil port A of the electromagnetic reversing valve is in fluid connection with a rodless cavity of the first steering oil cylinder and a rodless cavity of the second steering oil cylinder, a second working oil port B of the electromagnetic reversing valve is in fluid connection with a rodless cavity of the first steering oil cylinder and a rodless cavity of the second steering oil cylinder, and an input end of the programmable, the encoder is fixedly arranged on the steering column, and the output end of the programmable controller is connected with the control circuit of the electromagnetic directional valve.
Furthermore, an oil absorption filter is arranged on a fluid pipeline between the oil tank and the gear pump and used for filtering impurities in the pressure oil.
Furthermore, a safety valve is arranged between the oil outlet of the gear pump and the oil return branch through a fluid pipeline, so that overload of a hydraulic system is avoided.
Furthermore, the electromagnetic directional valve is a three-position four-way electromagnetic directional valve.
Furthermore, a first overload valve is arranged on a fluid pipeline between a first working oil port A of the electromagnetic directional valve and a rodless cavity of the first steering oil cylinder, a second overload valve is arranged on a fluid pipeline between a second working oil port B of the electromagnetic directional valve and a rodless cavity of the second steering oil cylinder, and an oil outlet of the first overload valve is communicated with an oil outlet of the second overload valve and is in fluid connection with an oil return branch.
Furthermore, an oil return filter is arranged between the oil return branch and an oil return opening of the oil tank and used for filtering impurities in the hydraulic oil.
Further, still include the steering wheel, the steering wheel sets up in the top of steering column.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the steering system is controlled by an encoder and a Programmable Logic Controller (PLC) computer, so that the steering precision is improved, and the operating force is small.
2. When the loader travels and does not steer, the hydraulic oil output by the gear pump does not enter the hydraulic steering system, but is converged with the hydraulic working system for the working system to use, so that no-load circulation is avoided, a large amount of energy is saved, and the energy-saving effect is good.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: the hydraulic control system comprises a fuel tank 1, a fuel suction filter 2, a gear pump 3, a safety valve 4, an electromagnetic directional valve 5, a first overload valve 6, a second overload valve 7, a first steering oil cylinder 8, a second steering oil cylinder 9, an oil return branch 10, an oil return filter 11, a steering column 12, a steering wheel 13, an encoder 14, a programmable controller 15, a P-oil inlet, an O-oil outlet, a first working oil port A, a second working oil port B and a hydraulic working system C.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the present invention provides an embodiment: a digital control hydraulic steering system of a loader comprises an oil tank 1, an oil suction filter 2, a gear pump 3, a safety valve 4, an electromagnetic directional valve 5, a first overload valve 6, a second overload valve 7, a first steering oil cylinder 8, a second steering oil cylinder 9, an oil return branch 10, an oil return filter 11, a steering column 12, a steering wheel 13, an encoder 14 and a programmable controller 15, wherein an oil inlet of the gear pump 3 is in fluid connection with an oil suction port of the oil tank 1, an oil outlet of the gear pump 3 is in fluid connection with an oil inlet P of the electromagnetic directional valve 5, an oil outlet O of the electromagnetic directional valve 5 is in fluid connection with the oil return branch 10, the tail end of the oil return branch 10 is in fluid connection with an oil return port of the oil tank 1, a first working oil port A of the electromagnetic directional valve 5 is in fluid connection with a rodless cavity of the first steering oil cylinder 8 and a rod cavity of the second steering oil cylinder 9, a second working oil port B of the electromagnetic directional valve 5 is in fluid connection with a rod cavity of the first, the input end of the programmable controller 15 is in circuit connection with the encoder 14, the encoder 14 is fixedly installed on the steering column 12, the output end of the programmable controller 15 is connected with the control end circuit of the electromagnetic directional valve 5, and the steering wheel 13 is arranged at the top end of the steering column 12.
An oil suction filter 2 is arranged on a fluid pipeline between the oil tank 1 and the gear pump 3 and used for filtering impurities in the pressure oil.
A safety valve 4 is arranged between an oil outlet of the gear pump 3 and the oil return branch 10 through a fluid pipeline, and overload of a hydraulic system is avoided.
The electromagnetic directional valve 5 is a three-position four-way electromagnetic directional valve.
A first overload valve 6 is arranged on a fluid pipeline between a first working oil port A of the electromagnetic directional valve 5 and a rodless cavity of the first steering oil cylinder 8, a second overload valve 7 is arranged on a fluid pipeline between a second working oil port B of the electromagnetic directional valve 5 and a rodless cavity of the second steering oil cylinder 9, an oil outlet of the first overload valve 6 is communicated with an oil outlet of the second overload valve 7 and is in fluid connection with an oil return branch 10, and the first overload valve 6 and the second overload valve 7 are used for realizing rapid overflow when the loader turns left or right (if meeting emergencies (if touching large stones), so as to prevent the steering system from being overloaded.
An oil return filter 11 is arranged between the oil return branch 10 and an oil return port of the oil tank 1 and is used for filtering impurities in the hydraulic oil.
The working principle of the embodiment is as follows: when the loader runs straight without steering, the steering wheel 13 and the steering column 12 do not rotate, the encoder 14 and the programmable controller 15 do not output, the electromagnetic directional valve 5 is positioned in the middle position, the oil path between the gear pump 3 and the first steering oil cylinder 8 and the oil path between the gear pump 3 and the second steering oil cylinder 9 are disconnected, hydraulic oil output by the gear pump 3 is converged with the hydraulic working system C to be used by the working system, and the no-load circulation of the hydraulic steering system is avoided.
When the loader needs to turn left, the steering wheel 13 is turned left and drives the steering column 12 to simultaneously rotate in the same direction, an encoder 14 fixed on the steering column 12 outputs an angle signal to a programmable controller 15, the programmable controller 15 sends an instruction, the electromagnetic directional valve 5 moves left and works in the right position, hydraulic oil output by the gear pump 3 respectively enters a rod cavity of the first steering cylinder 8 and a rodless cavity of the second steering cylinder 9 through an oil inlet P and a second working oil port B of the electromagnetic directional valve 5 to push a piston rod of the first steering cylinder 8 to retract inwards and a piston rod of the second steering cylinder 9 to extend outwards, meanwhile, hydraulic oil in the rod cavities of the first steering cylinder 8 and the second steering cylinder 9 flows back to the oil tank 1 through a first working oil port A, an oil outlet O and an oil return branch 10 of the electromagnetic directional valve 5, piston rod ends of the first steering cylinder 8 and the second steering cylinder 9 are installed on a front frame (not shown in the figure), the front frame and the rear frame (not shown in the figure) are hinged, so that the inward retraction of the piston rod of the first steering cylinder 8 and the outward extension of the piston rod of the second steering cylinder 9 drive the front frame to rotate to the left around the hinged point, and the left rotation of the loader is completed.
When the loader needs to turn right, a steering wheel 13 is rotated right and drives a steering column 12 to simultaneously rotate in the same direction, an encoder 14 fixed on the steering column 12 outputs an angle signal to a programmable controller 15, the programmable controller 15 sends a command, an electromagnetic directional valve 5 moves right and works in the left position, hydraulic oil output by a gear pump 3 enters a rodless cavity of a first steering oil cylinder 8 and a rod cavity of a second steering oil cylinder 9 through an oil inlet P and a first working oil port A of the electromagnetic directional valve 5 respectively to push a piston rod of the first steering oil cylinder 8 to extend outwards and a piston rod of the second steering oil cylinder 9 to retract inwards, meanwhile, the hydraulic oil in the rod cavity of the first steering oil cylinder 8 and the rodless cavity of the second steering oil cylinder 9 flows back to an oil tank 1 through a second working oil port B and an oil outlet O of the electromagnetic directional valve 5 and an oil return branch 10, the outwards extending piston rod of the first steering oil cylinder 8 and the inwards retracting piston rod of the second steering oil cylinder 9 drive a front frame to rotate right around a hinge, and completing the right-turning action of the loader.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A digital control hydraulic steering system of a loader is characterized in that: including oil tank (1), gear pump (3), solenoid directional valve (5), first steering cylinder (8), second steering cylinder (9), oil return branch (10), steering column (12), encoder (14) and programmable controller (15), the oil inlet of gear pump (3) and the oil absorption mouth fluid connection of oil tank (1), the oil-out of gear pump (3) and oil inlet (P) fluid connection of solenoid directional valve (5), oil-out (O) and oil return branch (10) fluid connection of solenoid directional valve (5), the end and the oil return mouth fluid connection of oil tank (1) of oil return branch (10), the first work oil mouth (A) of solenoid directional valve (5) and the rodless chamber of first steering cylinder (8) and the pole chamber fluid connection that has of second steering cylinder (9), the second work oil mouth (B) of solenoid directional valve (5) and the pole chamber that has of first steering cylinder (8) and second steering cylinder (9) ) The system is characterized in that the rodless cavities are in fluid connection, the input end of the programmable controller (15) is in circuit connection with the encoder (14), the encoder (14) is fixedly installed on the steering column (12), and the output end of the programmable controller (15) is in circuit connection with the control end of the electromagnetic directional valve (5).
2. The numerically controlled hydraulic steering system for a loader of claim 1, wherein: and an oil absorption filter (2) is arranged on a fluid pipeline between the oil tank (1) and the gear pump (3) and is used for filtering impurities in the pressure oil.
3. The numerically controlled hydraulic steering system for a loader of claim 1, wherein: a safety valve (4) is arranged between an oil outlet of the gear pump (3) and the oil return branch (10) through a fluid pipeline, and overload of a hydraulic system is avoided.
4. The numerically controlled hydraulic steering system for a loader of claim 1, wherein: the electromagnetic directional valve (5) is a three-position four-way electromagnetic directional valve.
5. The numerically controlled hydraulic steering system for a loader of claim 1, wherein: a first overload valve (6) is arranged on a fluid pipeline between a first working oil port (A) of the electromagnetic directional valve (5) and a rodless cavity of the first steering oil cylinder (8), a second overload valve (7) is arranged on a fluid pipeline between a second working oil port (B) of the electromagnetic directional valve (5) and a rodless cavity of the second steering oil cylinder (9), and an oil outlet of the first overload valve (6) is communicated with an oil outlet of the second overload valve (7) and is in fluid connection with an oil return branch (10).
6. The numerically controlled hydraulic steering system for a loader of claim 1, wherein: and an oil return filter (11) is arranged between the oil return branch (10) and an oil return opening of the oil tank (1) and is used for filtering impurities in the hydraulic oil.
7. The numerically controlled hydraulic steering system for a loader of claim 1, wherein: the steering wheel (13) is further arranged at the top end of the steering column (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921716371.4U CN210760964U (en) | 2019-10-14 | 2019-10-14 | Digital control hydraulic steering system of loader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921716371.4U CN210760964U (en) | 2019-10-14 | 2019-10-14 | Digital control hydraulic steering system of loader |
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| Publication Number | Publication Date |
|---|---|
| CN210760964U true CN210760964U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921716371.4U Active CN210760964U (en) | 2019-10-14 | 2019-10-14 | Digital control hydraulic steering system of loader |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112606903A (en) * | 2021-01-25 | 2021-04-06 | 第一拖拉机股份有限公司 | Mechanical-electrical-hydraulic integrated control crawler tractor steering system |
-
2019
- 2019-10-14 CN CN201921716371.4U patent/CN210760964U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112606903A (en) * | 2021-01-25 | 2021-04-06 | 第一拖拉机股份有限公司 | Mechanical-electrical-hydraulic integrated control crawler tractor steering system |
| CN112606903B (en) * | 2021-01-25 | 2022-02-01 | 第一拖拉机股份有限公司 | Mechanical-electrical-hydraulic integrated control crawler tractor steering system |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201224 Address after: Industrial Park, Luxi County, Pingxiang, Jiangxi Patentee after: PINGXIANG FANGYUAN INDUSTRY Co.,Ltd. Address before: 337000 Luxi County Industrial Park, Pingxiang City, Jiangxi Province Patentee before: Jiangxi Boyuan Digital Hydraulic Technology Co.,Ltd. |
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| TR01 | Transfer of patent right |