CN114508514A - Land leveler multi-rotary-motor control hydraulic system and control method thereof - Google Patents
Land leveler multi-rotary-motor control hydraulic system and control method thereof Download PDFInfo
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- CN114508514A CN114508514A CN202210110068.XA CN202210110068A CN114508514A CN 114508514 A CN114508514 A CN 114508514A CN 202210110068 A CN202210110068 A CN 202210110068A CN 114508514 A CN114508514 A CN 114508514A
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- oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
Abstract
The invention discloses a hydraulic system for controlling a plurality of rotary motors of a land leveler and a control method thereof, belonging to the field of electro-hydraulic control of engineering machinery. The system comprises a hydraulic oil tank, a reversing valve, a flow divider valve, a plurality of turbine boxes, a plurality of rotary motors, a plurality of bidirectional overload valves, a plunger pump, an oil absorption filter and the like, and a plurality of rotary motor control loops are finally formed through the connection of the elements. The invention can realize that a plurality of rotary motors move at the same rotating speed and the same pressure, thereby ensuring that a plurality of turbine boxes move at the same rotating speed, and the invention has uniform stress and smooth movement.
Description
Technical Field
The invention relates to a hydraulic system for controlling a plurality of rotary motors of a land leveler and a control method thereof, belonging to the field of electro-hydraulic control of engineering machinery.
Background
With the rapid development of economic construction in China, the demands for energy, electric power and nonferrous metals are increasing day by day, so that the industries of coal mines, iron ores and nonferrous metal mines are prosperous directly, open-pit mines account for a large proportion, the mining cost is low, the safety is high, the transportation is convenient and the attention of all parties is paid, the transportation is convenient in the open-pit mining, the high-horsepower land leveler is required to clean and level the road surface, and the high-horsepower land leveler is used as an important auxiliary device for the mining industry under the condition.
The high-horsepower land leveller, especially the land leveller with the power of more than 500 horsepower, the scraper knife is wide and long, the load carrying capacity is strong, the diameter of a rotary gear ring matched with the high-horsepower land leveller is about 2.5m generally, if only one turbine box and the rotary motor drive the rotary gear ring, the rotary gear ring is not stressed uniformly and is easy to shake, and the turbine box and the rotary motor are large in size and not easy to arrange, so that the failure rate is extremely high, and the construction efficiency and the construction precision are influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a hydraulic system for controlling a plurality of rotary motors of a land scraper.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic system for controlling a plurality of rotary motors of a land leveler comprises a hydraulic oil tank, a reversing valve, a flow divider valve, a plunger pump, an oil absorption filter, a plurality of turbine boxes, a plurality of rotary motors and a plurality of bidirectional overload valves;
the hydraulic oil tank is respectively connected with a reversing valve and an oil absorption filter, the oil absorption filter is connected with an oil suction port of a plunger pump, an oil outlet of the plunger pump is connected with the reversing valve, the reversing valve is connected with an oil inlet of a flow dividing valve, an oil outlet of the flow dividing valve is respectively connected with a plurality of bidirectional overload valves, the plurality of bidirectional overload valves are connected with the reversing valve after confluence, each bidirectional overload valve is connected with a rotary motor, and each rotary motor is meshed with a turbine box.
Further, the air conditioner is provided with a fan,
the reversing valve is a three-position four-way valve, an oil inlet of the three-position four-way valve is connected with an oil outlet of the plunger pump, an oil return port of the three-position four-way valve is connected with the hydraulic oil tank, one working oil port of the three-position four-way valve is connected with an oil inlet of the flow divider valve, and the other working oil port is connected with an oil path after confluence of the two-way overload valves.
Further, the air conditioner is provided with a fan,
the flow divider is provided with a plurality of outflow ports, and each outflow port is correspondingly connected with a two-way overload valve.
Further, the air conditioner is provided with a fan,
the quantity of turbine case, rotary motor and two-way overload valve is two, including turbine case I, turbine case II, rotary motor I, rotary motor II, two-way overload valve I and two-way overload valve II, the flow divider valve be equipped with two oil-outs, and the oil inlet of two-way overload valve I is connected to an oil-out, and the oil inlet of two-way overload valve II is connected to another oil-out, rotary motor I is connected to the oil-out of two-way overload valve I, rotary motor II is connected to the oil-out of two-way overload valve II, and the working oil port of switching-over valve is connected to the oil circuit after two-way overload valve I and two-way overload valve II confluence.
Accordingly, a control method for controlling a hydraulic system by a plurality of rotary motors of a land leveler,
the method comprises the following steps:
controlling a plunger pump to pump hydraulic oil in a hydraulic oil tank, converting the hydraulic oil into high-pressure oil, and pumping the high-pressure oil to a reversing valve;
controlling the reversing valve to be electrified so as to pump high-pressure oil to the flow divider valve;
the oil flow passing through each two-way overload valve is the same and the oil pressure is the same by using the shunt valve, so that the oil flow of each rotary motor is consistent with the differential pressure, and the torque output by each turbine box is consistent;
and controlling the working oil to flow back to the hydraulic oil tank through an oil way and a reversing valve after the oil is converged by the two-way overload valves.
Accordingly, a control method for controlling a hydraulic system by a plurality of rotary motors of a land leveler,
controlling a plunger pump to pump hydraulic oil in a hydraulic oil tank, converting the hydraulic oil into high-pressure oil, and pumping the high-pressure oil to a reversing valve;
and controlling the reversing valve to be electrified so as to pump high-pressure oil to an oil way formed by confluence of a plurality of bidirectional overload valves.
Accordingly, a control method for controlling a hydraulic system by a plurality of rotary motors of a land leveler,
the oil flow passing through each two-way overload valve is the same and the oil pressure is the same by using the shunt valve, so that the oil flow of each rotary motor is consistent with the differential pressure, and the torque output by each turbine box is consistent.
Accordingly, a control method for controlling a hydraulic system by a plurality of rotary motors of a land leveler,
and controlling the working oil to flow back to the hydraulic oil tank through the flow dividing valve and the reversing valve.
Accordingly, a control method for controlling a hydraulic system by a plurality of rotary motors of a land leveler,
when the turbine box is overloaded and skids, the reversing valve is controlled not to be electrified, so that the hydraulic oil only flows between the bidirectional overload valve and the rotary motor.
The hydraulic system for controlling the multiple rotary motors of the land leveler and the control method thereof have the advantages that the flow and the pressure input by each motor are the same, the torque output by each turbine box connected with the motor is the same, when the motors drive the rotary gear rings together, all stress points of the rotary gear rings are uniform, the rotation is smooth, no clamping stagnation, no shaking and other fault phenomena occur, and the working efficiency and the working precision of the land leveler are improved.
Drawings
The invention will be further described with reference to the accompanying drawings and embodiments, which for ease of understanding take two rotary motors as examples:
FIG. 1 is a hydraulic schematic of the present invention;
in the figure: 1. the hydraulic oil tank comprises a hydraulic oil tank 2, a reversing valve 3, a flow divider valve 4-I, turbine tanks I, 4-II, turbine tanks II, 5-I, rotary motors I, 5-II, rotary motors II, 6-I, bidirectional overload valves I, 6-II, bidirectional overload valves II, 7, plunger pumps 8 and an oil absorption filter.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, a hydraulic system for controlling multiple rotary motors of a land leveler comprises a hydraulic oil tank 1, a reversing valve 2, a flow divider valve 3, a plunger pump 7, an oil suction filter 8, multiple turbine boxes 4, multiple rotary motors 5 and multiple bidirectional overload valves 6; the hydraulic oil tank 1 is respectively connected with a reversing valve 2 and an oil absorption filter 8, the oil absorption filter 8 is connected with an oil suction port of a plunger pump 7, an oil outlet of the plunger pump 7 is connected with the reversing valve 2, the reversing valve 2 is connected with an oil inlet of a flow dividing valve 3, an oil outlet of the flow dividing valve 3 is respectively connected with a plurality of two-way overload valves 6, the plurality of two-way overload valves 6 are connected with the reversing valve 2 after confluence, each two-way overload valve 6 is connected with a rotary motor 5, and each rotary motor 5 is connected with a turbine box 4 through spline engagement. Reversing valve 2 is equipped with No. 1 mouth, No. 2 mouth, No. 3 mouths and No. 4 mouths, and wherein, No. 1 mouth is the oil inlet, and No. 2 mouths and No. 3 mouths are the working oil mouth, and No. 4 mouths are the oil return opening, hydraulic tank 1 is connected to No. 4 mouths of reversing valve 2, No. 1 mouth of reversing valve 2 is connected the oil-out of plunger pump 7. The flow divider 3 is provided with a port 1, a port 2 and a port 3, wherein the port 1 is an oil inlet, the port 2 and the port 3 are oil outlets, and the port 1 of the flow divider 3 is connected with the port 2 of the reversing valve 2. The number of the turbine boxes 4, the rotary motors 5 and the two-way overload valves 6 is two, the two-way overload valves comprise turbine boxes I4-I, turbine boxes II4-II, rotary motors I5-I, rotary motors II5-II, two-way overload valves I6-I and two-way overload valves II6-II, the two-way overload valves I6-I and the two-way overload valves II6-II are respectively provided with a port 1, a port 2, a port 3 and a port 4, wherein the port 1 is an oil inlet, the ports 2 and 3 are oil outlets, the port 4 is an oil return port, the port 2 of the flow divider valve 3 is connected with the port 1 of the two-way overload valve I6-I, the port 3 of the flow divider valve 3 is connected with the port 1 of the two-way overload valve II6-II, the port 2 and the port 3 of the spline of the two-way overload valve I6-I are connected with the rotary motors I5-I, and the rotary motors I5-I are connected with the turbine boxes I4-I in a meshed manner, no. 2 port and No. 3 port of the two-way overload valve II6-II are connected with a rotary motor II5-II, the rotary motor II5-II is connected with a turbine box II4-II through spline engagement, and the No. 3 port of the reversing valve 2 is connected after the confluence of the No. 4 ports of the two-way overload valve I6-I and the two-way overload valve II 6-II. The reversing valve 2 is also provided with a Y1 electromagnet and a Y2 electromagnet.
The specific working process of the invention is as follows:
the rotation of the rotary gear ring of the land scraper is realized by the rotation of two turbine boxes I and II which are in gear engagement connection with the rotary gear ring. When the Y1 electromagnet of the reversing valve 2 is electrified, high-pressure oil output by the plunger pump 7 enters the port 1 of the diverter valve 3 through the port 1 and the port 2 of the reversing valve 2, because the diverter valve 3 has the double functions of equal proportion diversion and flow collection, the high-pressure oil flowing through the diverter valve 3 is evenly divided into two parts which are output through the port 2 and the port 3 of the diverter valve 3, the pressure is the same, the oil of the port 2 of the diverter valve 3 enters the rotary motor I5-I through the port 1 and the port 2 of the bidirectional overload valve I6-I, the oil of the port 3 of the diverter valve 3 enters the rotary motor II5-II through the port 1 and the port 2 of the bidirectional overload valve II6-II, the rotary motor I5-I and the rotary motor II5-II are connected with the turbine box I4-I and the turbine box II4-II through spline meshing, and therefore, the torque output by the turbine box I4-I and the turbine box II4-II is the same, the rotary gear rings are driven together, and finally, oil returns to the hydraulic oil tank 1 through the reversing valve 2;
when the Y2 electromagnet of the reversing valve 2 is electrified, high-pressure oil output by the plunger pump 7 sequentially passes through a port 1 and a port 3 of the reversing valve 2, a port 4 and a port 3 of the bidirectional overload valve I6-I and a port 4 and a port 3 of the bidirectional overload valve II6-II, enters the rotary motor I5-I and the rotary motor II5-II, low-pressure oil flowing out of the rotary motor I5-I and the rotary motor II5-II enters the diverter valve 3 through a port 2 and a port 1 of the bidirectional overload valve I6-I and a port 2 and a port 1 of the bidirectional overload valve II6-II, and the diverter valve 3 has the functions of equal ratio flow division and flow collection, so that two parts of low-pressure oil flowing through the diverter valve 3 are uniformly distributed and have the same pressure, the flow and differential pressure of the rotary motor I5-I and the rotary motor II5-II are consistent, and the rotary motor I5-I and 5-II are meshed with the turbine box I-4 and the turbine box The box II4-II is connected, so that the torque output by the turbine box I4-I is consistent with the torque output by the turbine box II4-II, the turbine box I4-I and the turbine box II4-II drive the rotary gear ring together, and finally, the oil returns to the hydraulic oil tank 1 through the reversing valve 2.
In the operation process, the electromagnets Y1 and Y2 of the reversing valve 2 are not powered, so that the turbine box I4-I and the turbine box II4-II are overloaded and slide, the rotary motor I5-I and the rotary motor II5-II also rotate, and oil flows between two oil ports of the rotary motor I5-I and between two oil ports of the rotary motor II5-II through the two-way overload valve I6-I and the two-way overload valve II6-II which are connected with the rotary motor I4-I and the two-way overload valve II so as to avoid dry grinding damage of the rotary motor I5-I and the rotary motor II 5-II.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (9)
1. A hydraulic system for controlling a plurality of rotary motors of a land leveler is characterized by comprising a hydraulic oil tank (1), a reversing valve (2), a flow divider valve (3), a plunger pump (7), an oil absorption filter (8), a plurality of turbine boxes (4), a plurality of rotary motors (5) and a plurality of bidirectional overload valves (6);
the hydraulic oil tank (1) is respectively connected with a reversing valve (2) and an oil absorption filter (8), the oil absorption filter (8) is connected with an oil suction port of a plunger pump (7), an oil outlet of the plunger pump (7) is connected with the reversing valve (2), the reversing valve (2) is connected with an oil inlet of a flow dividing valve (3), the oil outlet of the flow dividing valve (3) is respectively connected with a plurality of two-way overload valves (6), the flow converging parts of the two-way overload valves (6) are connected with the reversing valve (2), each two-way overload valve (6) is connected with a rotary motor (5), and each rotary motor (5) is meshed with a turbine box (4).
2. The multiple swing motor control hydraulic system of a grader according to claim 1,
the reversing valve (2) is a three-position four-way valve, an oil inlet of the three-position four-way valve is connected with an oil outlet of the plunger pump (7), an oil return port of the three-position four-way valve is connected with the hydraulic oil tank (1), a working oil port of the three-position four-way valve is connected with an oil inlet of the flow dividing valve (3), and another working oil port is connected with an oil way after confluence of the two-way overload valves (6).
3. A multiple-swing motor controlled hydraulic system of a grader according to claim 2, characterized in that the splitter valve (3) is provided with a plurality of outlets, each outlet being connected to a respective one of the two-way overload valves (6).
4. The hydraulic system for controlling the multiple rotary motors of the land leveler as claimed in claim 3, wherein the number of the turbine box (4), the rotary motor (5) and the two-way overload valve (6) is two, and the hydraulic system comprises a turbine box I (4-I), a turbine box II (4-II), a rotary motor I (5-I), a rotary motor II (5-II), a two-way overload valve I (6-I) and a two-way overload valve II (6-II), the flow divider valve (3) is provided with two oil outlets, one oil outlet is connected with an oil inlet of the two-way overload valve I (6-I), the other oil outlet is connected with an oil inlet of the two-way overload valve II (6-II), the oil outlet of the two-way overload valve I (6-I) is connected with the rotary motor I (5-I), and the oil outlet of the two-way overload valve II (6-II) is connected with the rotary motor II (5-II), the oil path after the confluence of the two-way overload valve I (6-I) and the two-way overload valve II (6-II) is connected with the working oil port of the reversing valve (2).
5. The control method of a grader multi-swing motor control hydraulic system according to claim 1,
the method comprises the following steps:
controlling a plunger pump to pump hydraulic oil in a hydraulic oil tank, converting the hydraulic oil into high-pressure oil, and pumping the high-pressure oil to a reversing valve;
controlling the reversing valve to be electrified so as to pump high-pressure oil to the flow divider valve;
the oil flow passing through each two-way overload valve is the same and the oil pressure is the same by using the shunt valve, so that the oil flow of each rotary motor is consistent with the differential pressure, and the torque output by each turbine box is consistent;
and controlling the working oil to flow back to the hydraulic oil tank through an oil way and a reversing valve after the oil is converged by the two-way overload valves.
6. The control method of a grader multi-swing motor control hydraulic system according to claim 2,
controlling a plunger pump to pump hydraulic oil in a hydraulic oil tank, converting the hydraulic oil into high-pressure oil, and pumping the high-pressure oil to a reversing valve;
and controlling the reversing valve to be electrified so as to pump high-pressure oil to an oil way formed by confluence of a plurality of bidirectional overload valves.
7. The control method of a grader multi-swing motor control hydraulic system according to claim 3,
the oil flow passing through each two-way overload valve is the same and the oil pressure is the same by using the shunt valve, so that the oil flow of each rotary motor is consistent with the differential pressure, and the torque output by each turbine box is consistent.
8. The control method of a grader multi-swing motor control hydraulic system according to claim 4,
and controlling the working oil to flow back to the hydraulic oil tank through the flow dividing valve and the reversing valve.
9. The control method of a grader multi-swing motor control hydraulic system according to claim 4,
when the turbine box is overloaded and skids, the reversing valve is controlled not to be electrified, so that the hydraulic oil only flows between the bidirectional overload valve and the rotary motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210110068.XA CN114508514A (en) | 2022-01-29 | 2022-01-29 | Land leveler multi-rotary-motor control hydraulic system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210110068.XA CN114508514A (en) | 2022-01-29 | 2022-01-29 | Land leveler multi-rotary-motor control hydraulic system and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114508514A true CN114508514A (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210110068.XA Pending CN114508514A (en) | 2022-01-29 | 2022-01-29 | Land leveler multi-rotary-motor control hydraulic system and control method thereof |
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| CN (1) | CN114508514A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2880896Y (en) * | 2006-04-18 | 2007-03-21 | 江苏骏马压路机械有限公司 | Hydraulic system of hydraulic road roller |
| CN202023209U (en) * | 2011-03-14 | 2011-11-02 | 三一重工股份有限公司 | Overload protecting device for land scraper turning circle worm-gear case |
| CN102768112A (en) * | 2012-07-04 | 2012-11-07 | 鼎盛重工机械有限公司 | Hydraulic loading test table with power recovery function for land scraper rear axle |
| CN203460698U (en) * | 2013-07-30 | 2014-03-05 | 山东临工工程机械有限公司 | Front-wheel auxiliary drive system for land leveler |
| CN107448425A (en) * | 2017-07-21 | 2017-12-08 | 广西柳工机械股份有限公司 | Control valve and land leveller front wheel driven hydraulic system |
| CN109356894A (en) * | 2018-10-22 | 2019-02-19 | 广西柳工机械股份有限公司 | Land leveller front-wheel drive control valve and hydraulic system |
| CN111677029A (en) * | 2020-06-03 | 2020-09-18 | 徐州徐工筑路机械有限公司 | Front wheel auxiliary drive electro-hydraulic control system of land leveler and land leveler |
-
2022
- 2022-01-29 CN CN202210110068.XA patent/CN114508514A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2880896Y (en) * | 2006-04-18 | 2007-03-21 | 江苏骏马压路机械有限公司 | Hydraulic system of hydraulic road roller |
| CN202023209U (en) * | 2011-03-14 | 2011-11-02 | 三一重工股份有限公司 | Overload protecting device for land scraper turning circle worm-gear case |
| CN102768112A (en) * | 2012-07-04 | 2012-11-07 | 鼎盛重工机械有限公司 | Hydraulic loading test table with power recovery function for land scraper rear axle |
| CN203460698U (en) * | 2013-07-30 | 2014-03-05 | 山东临工工程机械有限公司 | Front-wheel auxiliary drive system for land leveler |
| CN107448425A (en) * | 2017-07-21 | 2017-12-08 | 广西柳工机械股份有限公司 | Control valve and land leveller front wheel driven hydraulic system |
| CN109356894A (en) * | 2018-10-22 | 2019-02-19 | 广西柳工机械股份有限公司 | Land leveller front-wheel drive control valve and hydraulic system |
| CN111677029A (en) * | 2020-06-03 | 2020-09-18 | 徐州徐工筑路机械有限公司 | Front wheel auxiliary drive electro-hydraulic control system of land leveler and land leveler |
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