CN103994216B - Manual steering hydraulic power tractor hydraulic control system - Google Patents
Manual steering hydraulic power tractor hydraulic control system Download PDFInfo
- Publication number
- CN103994216B CN103994216B CN201410202222.1A CN201410202222A CN103994216B CN 103994216 B CN103994216 B CN 103994216B CN 201410202222 A CN201410202222 A CN 201410202222A CN 103994216 B CN103994216 B CN 103994216B
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- Prior art keywords
- valve
- hydraulic
- oil
- operated direction
- way hand
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- Expired - Fee Related
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- 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
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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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
-
- 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
-
- 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
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a kind of manual steering hydraulic power tractor hydraulic control system, it comprises power pump station, hydralic pressure gauge, hydraulic control valve group, plunger case, hydraulic motor, wherein power pump station comprises motor, fuel tank, liquid level liquid thermometer, air cleaner, oil absorption filter, hydraulic pump, check valve, overflow valve, return filter, and hydraulic control valve group comprises M type 3-position 4-way hand-operated direction valve, overflow valve, hydraulicchange-over valve, Y type 3-position 4-way hand-operated direction valve, two-position four-way hand-operated direction valve, hydraulic control one-way valve, choke valve. The present invention can conveniently realize under different loads operating mode equipment in the flexible control of plunger case and driving process fast with the switching that drives at a slow speed gear, system architecture is succinct, convenient to operation, controls simple, safe and reliable, eliminated operating personnel's potential safety hazard simultaneously.
Description
Technical field
The present invention relates to a kind of hydraulic control system, relate in particular to a kind of manual steering hydraulic power tractor hydraulic control system. Belong to technical field of hydraulic.
Background technology
At present, normally travelling of semitrailer or full trailor all needs the traction of towing motorcar to realize. Because towing motorcar volume is large, radius of turn is large, higher to site requirements, is not suitable in small space or short distance transhipment, sometimes the job requirements of even can not realizing ideal, and towing motorcar system complex, complex operation, need professional driver, very flexible, inefficiency. Manual steering hydraulic power tractor compact conformation, total length, width and height size is little, be highly suitable for on-site or short distance and come and go the unloaded trailer of transfer or short distance transport underloading goods, can significantly enhance productivity, save time and cost, but owing to will meeting the requirement of the operating mode such as different loads and the different speed of a motor vehicle, most of function of this class car realizes by manpower or other modes at present, not only complex operation, cause operating efficiency low, and in the course of work, operating personnel are caused to certain potential safety hazard.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of manual steering hydraulic power tractor hydraulic control system is provided, can realizes easily the motion of executive component under different loads, reduce the system architecture of towing motorcar, simplify the operation, increase work efficiency and security.
The object of the present invention is achieved like this: a kind of manual steering hydraulic power tractor hydraulic control system, it comprises power pump station, hydraulic control valve group, plunger case and hydraulic motor, the oil-out of described power pump station is connected with the oil-in of hydraulic control valve group, the oil return opening of described power pump station respectively with oil return opening and first hydraulic motor of hydraulic control valve group, the oil return opening of the second hydraulic motor is connected, described hydraulic control valve group comprises a M type 3-position 4-way hand-operated direction valve, the second overflow valve, the 3rd overflow valve, hydraulicchange-over valve, Y type 3-position 4-way hand-operated direction valve, the 2nd M type 3-position 4-way hand-operated direction valve, two-position four-way hand-operated direction valve, hydraulic control one-way valve and choke valve, a hydraulic fluid port of a described M type 3-position 4-way hand-operated direction valve is connected with the oil-out of power pump station, another two hydraulic fluid ports are connected with a hydraulic fluid port of the 2nd M type 3-position 4-way hand-operated direction valve with Y type 3-position 4-way hand-operated direction valve respectively, a hydraulic fluid port of described Y type 3-position 4-way hand-operated direction valve is connected with the oil-in of hydraulic control one-way valve, the oil-out of described hydraulic control one-way valve is connected with the oil-in of plunger case by choke valve, another hydraulic fluid port of described Y type 3-position 4-way hand-operated direction valve is connected with the control hydraulic fluid port of hydraulic control one-way valve, the oil-in of described hydraulicchange-over valve is connected with the oil-in of hydraulic control valve group, two oil-outs of described hydraulicchange-over valve connect respectively two the second overflow valves that system pressure is provided constraints and the 3rd overflow valve, the oil-out of described the second overflow valve and the 3rd overflow valve all with a described M type 3-position 4-way hand-operated direction valve, the 2nd M type 3-position 4-way hand-operated direction valve is connected with a hydraulic fluid port of Y type 3-position 4-way hand-operated direction valve, the control hydraulic fluid port of described hydraulicchange-over valve is connected with the oil-in of hydraulic control one-way valve, a hydraulic fluid port of described the 2nd M type 3-position 4-way hand-operated direction valve is connected with the oil-in of the first hydraulic motor and a hydraulic fluid port of two-position four-way hand-operated direction valve respectively, the oil-out of described the first hydraulic motor is connected with a hydraulic fluid port of two-position four-way hand-operated direction valve, another hydraulic fluid port of described two-position four-way hand-operated direction valve is connected with the oil-out of the second hydraulic motor with a hydraulic fluid port of the 2nd M type 3-position 4-way hand-operated direction valve respectively, a hydraulic fluid port of described two-position four-way hand-operated direction valve is connected with the oil-out of the second hydraulic motor.
Described power pump station comprises motor, fuel tank, liquid level liquid thermometer, air cleaner, oil absorption filter, hydraulic pump, check valve and return filter, the output of described motor is connected with hydraulic pump, described liquid level liquid thermometer and air cleaner are all arranged on fuel tank, the oil-in of described hydraulic pump is connected with fuel tank by oil absorption filter, the oil-out of described hydraulic pump is connected with the oil-in of hydraulic control valve group by check valve, and the oil return opening of described power pump station is connected with fuel tank by return filter.
The oil-out of described hydraulic pump is connected with the first overflow valve of safeguard protection effect.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention has realized the convenient to operation of tractor, has eliminated operating personnel's potential safety hazard; Being used in conjunction with of hydraulicchange-over valve and two overflow valves, has realized plunger case and the independent control that drives operating pressure in equipment, has reached the object of different loads operating mode lower prop plug cylinder extension and contraction control; Being used in conjunction with of M type 3-position 4-way hand-operated direction valve and two-position four-way hand-operated direction valve, the connection in series-parallel that has realized two hydraulic motors connects, and has reached the object that drives fast and at a slow speed gear switch in driving process; The hydraulic control system being formed by power pump station, hydraulic control valve group and executing agency, simple for structure, control simple, safe and reliable.
Brief description of the drawings
Fig. 1 is the schematic diagram of a kind of manual steering hydraulic power of the present invention tractor hydraulic control system.
Fig. 2 is the hydraulic control valve pack module front view of a kind of manual steering hydraulic power of the present invention tractor hydraulic control system.
Fig. 3 is the hydraulic control valve pack module left view of a kind of manual steering hydraulic power of the present invention tractor hydraulic control system.
Wherein:
Power pump station 1
Hydralic pressure gauge 2
Hydraulic control valve group 3
Plunger case 4
The first hydraulic motor 51
The second hydraulic motor 52
Motor 6
Fuel tank 7
Liquid level liquid thermometer 8
Air cleaner 9
Oil absorption filter 10
Hydraulic pump 11
Check valve 12
The first overflow valve 13
Return filter 14
The one M type 3-position 4-way hand-operated direction valve 15
The second overflow valve 16
The 3rd overflow valve 17
Hydraulicchange-over valve 18
Y type 3-position 4-way hand-operated direction valve 19
The 2nd M type 3-position 4-way hand-operated direction valve 20
Two-position four-way hand-operated direction valve 21
Hydraulic control one-way valve 22
Choke valve 23.
Detailed description of the invention
Referring to Fig. 1-Fig. 3, the present invention relates to a kind of manual steering hydraulic power tractor hydraulic control system, this system comprises power pump station 1, hydralic pressure gauge 2, hydraulic control valve group 3, plunger case 4, the first hydraulic motor 51 and the second hydraulic motor 52, described power pump station 1 comprises motor 6, fuel tank 7, liquid level liquid thermometer 8, air cleaner 9, oil absorption filter 10, hydraulic pump 11, check valve 12, the first overflow valve 13 and return filter 14, the output of described motor 6 is connected with hydraulic pump 11, described liquid level liquid thermometer 8 and air cleaner 9 are all arranged on fuel tank 7, the oil-in of described hydraulic pump 11 is connected with fuel tank 7 by oil absorption filter 10, the oil-out of described hydraulic pump 11 is connected with the oil inlet P of hydraulic control valve group 3 by check valve 12, described hydralic pressure gauge 2 is arranged at hydraulic pump 11 oil-outs of power pump station 1, for display system pressure, the oil-out of described hydraulic pump 11 is connected with the first overflow valve 13 of safeguard protection effect, the oil return inlet T 1 of described power pump station 1, T2 respectively with oil return inlet T and first hydraulic motor 51 of hydraulic control valve group 3, the oil return opening L of the second hydraulic motor 52 is connected, and the oil return opening of described power pump station 1 is connected with fuel tank 7 by return filter 14.
Described hydraulic control valve group 3 comprises a M type 3-position 4-way hand-operated direction valve 15, the second overflow valve 16, the 3rd overflow valve 17, hydraulicchange-over valve 18, Y type 3-position 4-way hand-operated direction valve 19, the 2nd M type 3-position 4-way hand-operated direction valve 20, two-position four-way hand-operated direction valve 21, hydraulic control one-way valve 22 and choke valve 23, the oil-in of a described M type 3-position 4-way hand-operated direction valve 15 is connected with the oil-out of power pump station 1, described Y type 3-position 4-way hand-operated direction valve 19 is connected with the oil-in A1 of plunger case 4 with choke valve 23 by hydraulic control one-way valve 22, described the 2nd M type 3-position 4-way hand-operated direction valve 20 and two-position four-way hand-operated direction valve 21 respectively with the first hydraulic motor 51, the oil-in A2 of the second hydraulic motor 52, A3 and oil-out B2, B3 is connected, and the oil-in of described hydraulicchange-over valve 18 is connected with the oil inlet P of hydraulic control valve group 3, two oil-out A of described hydraulicchange-over valve 18, B connects respectively two the second overflow valves 16 that system pressure is provided constraints and the 3rd overflow valve 17, and the control port of described hydraulicchange-over valve 18 is connected with the oil-in of hydraulic control one-way valve 22.
The oil-out of described power pump station 1 is connected with the oil inlet P of hydraulic control valve group 3, the oil inlet P of hydraulic control valve group 3 is connected with a hydraulic fluid port P for M type 3-position 4-way hand-operated direction valve 15 and the hydraulic fluid port P of hydraulicchange-over valve 18 respectively, the hydraulic fluid port A of the one M type 3-position 4-way hand-operated direction valve 15 is connected with the hydraulic fluid port P of Y type 3-position 4-way hand-operated direction valve 19, the hydraulic fluid port A of Y type 3-position 4-way hand-operated direction valve 19 is connected with the control port of hydraulicchange-over valve 18 with the oil-in of hydraulic control one-way valve 22 respectively, the hydraulic fluid port B of Y type 3-position 4-way hand-operated direction valve 19 is connected with the control port of hydraulic control one-way valve 22, the oil-out of hydraulic control one-way valve 22 is connected with the oil-in of choke valve 23, the oil-out of choke valve 23 is connected with the hydraulic fluid port A1 of plunger case 4, the hydraulic fluid port A of hydraulicchange-over valve 18 is connected with the oil-in of overflow valve 17 with overflow valve 16 respectively with hydraulic fluid port B, the oil-out of overflow valve 16 and overflow valve 17 is through the hydraulic fluid port T of Y type 3-position 4-way hand-operated direction valve 19, the hydraulic fluid port T of the hydraulic fluid port T of M type 3-position 4-way hand-operated direction valve 20 and M type 3-position 4-way hand-operated direction valve 15 is connected with the oil-out T of hydraulic control valve group 3, the hydraulic fluid port B of M type 3-position 4-way hand-operated direction valve 15 is connected with the hydraulic fluid port P of M type 3-position 4-way hand-operated direction valve 20, the hydraulic fluid port A of M type 3-position 4-way hand-operated direction valve 20 is connected with the oil-in A2 of the first hydraulic motor 51 and the hydraulic fluid port P of two-position four-way hand-operated direction valve 21 respectively, the oil-out B2 of the first hydraulic motor 51 is connected with the hydraulic fluid port T of two-position four-way hand-operated direction valve 21, the hydraulic fluid port B of two-position four-way hand-operated direction valve 21 is connected with the oil-out B3 of the second hydraulic motor 52 with the hydraulic fluid port B of M type 3-position 4-way hand-operated direction valve 20 respectively, the hydraulic fluid port A of two-position four-way hand-operated direction valve 21 is connected with the oil-out A3 of the second hydraulic motor 52.
A described M type 3-position 4-way hand-operated direction valve 15 is in the time of meta, and plunger case 4 and the first hydraulic motor 51, the second hydraulic motor 52 all do not move; When a M type 3-position 4-way hand-operated direction valve 15 is switched to left position, when Y type 3-position 4-way hand-operated direction valve 19 is switched to left position, fluid enters plunger case 4 by hydraulic control one-way valve 22 and choke valve 23, realize the extend action of plunger case 4, fluid enters the control port of hydraulicchange-over valve 18 simultaneously, hydraulicchange-over valve 18 is switched to right position, and system pressure is determined by the second overflow valve 16 setting pressures; When a M type 3-position 4-way hand-operated direction valve 15 is switched to left position, when Y type 3-position 4-way hand-operated direction valve 19 is switched to right position, fluid enters the control port of hydraulic control one-way valve 22, hydraulic control one-way valve 22 is opened, fluid in plunger case 4 is got back to fuel tank 7 by choke valve 23 and hydraulic control one-way valve 22, realizes the contractive action of plunger case 4; When a M type 3-position 4-way hand-operated direction valve 15 is switched to right position, by switching the 2nd M type 3-position 4-way hand-operated direction valve 20 and two-position four-way hand-operated direction valve 21, realize the switching that drives fast and at a slow speed gear, hydraulicchange-over valve 18 is in initial position, and system pressure is determined by overflow valve 17 setting pressures.
Described choke valve 23, by regulating openings of sizes, can be realized the control to plunger case 4 stretching speed speeds.
Described the 2nd M type 3-position 4-way hand-operated direction valve 20 is switched to left position, and two-position four-way hand-operated direction valve 21 is in the time of left position, and two hydraulic motors are connected, and driving gear is quick shelves; When the 2nd M type 3-position 4-way hand-operated direction valve 20 is switched to left position, when two-position four-way hand-operated direction valve 21 is switched to right position, two hydraulic motor parallel connections, drive gear at a slow speed grade.
Claims (3)
1. a manual steering hydraulic power tractor hydraulic control system, it is characterized in that: it comprises power pump station (1), hydraulic control valve group (3), plunger case (4) and hydraulic motor (5), the oil-out of described power pump station (1) is connected with the oil-in of hydraulic control valve group (3), the oil return opening of described power pump station (1) respectively with oil return opening and first hydraulic motor (51) of hydraulic control valve group (3), the oil return opening of the second hydraulic motor (52) is connected, described hydraulic control valve group (3) comprises a M type 3-position 4-way hand-operated direction valve (15), the second overflow valve (16), the 3rd overflow valve (17), hydraulicchange-over valve (18), Y type 3-position 4-way hand-operated direction valve (19), the 2nd M type 3-position 4-way hand-operated direction valve (20), two-position four-way hand-operated direction valve (21), hydraulic control one-way valve (22) and choke valve (23), a hydraulic fluid port of a described M type 3-position 4-way hand-operated direction valve (15) is connected with the oil-out of power pump station (1), another two hydraulic fluid ports are connected with a hydraulic fluid port of the 2nd M type 3-position 4-way hand-operated direction valve (20) with Y type 3-position 4-way hand-operated direction valve (19) respectively, a hydraulic fluid port of described Y type 3-position 4-way hand-operated direction valve (19) is connected with the oil-in of hydraulic control one-way valve (22), the oil-out of described hydraulic control one-way valve (22) is connected with the oil-in of plunger case (4) by choke valve (23), another hydraulic fluid port of described Y type 3-position 4-way hand-operated direction valve (19) is connected with the control hydraulic fluid port of hydraulic control one-way valve (22), the oil-in of described hydraulicchange-over valve (18) is connected with the oil-in of hydraulic control valve group (3), two oil-outs of described hydraulicchange-over valve (18) connect respectively two the second overflow valves (16) that system pressure is provided constraints and the 3rd overflow valve (17), the oil-out of described the second overflow valve (16) and the 3rd overflow valve (17) all with a described M type 3-position 4-way hand-operated direction valve (15), a hydraulic fluid port of the 2nd M type 3-position 4-way hand-operated direction valve (20) and Y type 3-position 4-way hand-operated direction valve (19) is connected, the control hydraulic fluid port of described hydraulicchange-over valve (18) is connected with the oil-in of hydraulic control one-way valve (22), a hydraulic fluid port of described the 2nd M type 3-position 4-way hand-operated direction valve (20) is connected with the oil-in of the first hydraulic motor (51) and a hydraulic fluid port of two-position four-way hand-operated direction valve (21) respectively, the oil-out of described the first hydraulic motor (51) is connected with a hydraulic fluid port of two-position four-way hand-operated direction valve (21), another hydraulic fluid port of described two-position four-way hand-operated direction valve (21) is connected with the oil-out of the second hydraulic motor (52) with a hydraulic fluid port of the 2nd M type 3-position 4-way hand-operated direction valve (20) respectively, a hydraulic fluid port of described two-position four-way hand-operated direction valve (21) is connected with the oil-out of the second hydraulic motor (52).
2. a kind of manual steering hydraulic power tractor hydraulic control system according to claim 1, it is characterized in that: described power pump station (1) comprises motor (6), fuel tank (7), liquid level liquid thermometer (8), air cleaner (9), oil absorption filter (10), hydraulic pump (11), check valve (12) and return filter (14), the output of described motor (6) is connected with hydraulic pump (11), described liquid level liquid thermometer (8) and air cleaner (9) are all arranged on fuel tank (7), the oil-in of described hydraulic pump (11) is connected with fuel tank (7) by oil absorption filter (10), the oil-out of described hydraulic pump (11) is connected with the oil-in of hydraulic control valve group (3) by check valve (12), the oil return opening of described power pump station (1) is connected with fuel tank (7) by return filter (14).
3. a kind of manual steering hydraulic power tractor hydraulic control system according to claim 2, is characterized in that: the oil-out of described hydraulic pump (11) is connected with first overflow valve (13) of safeguard protection effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202222.1A CN103994216B (en) | 2014-05-14 | 2014-05-14 | Manual steering hydraulic power tractor hydraulic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202222.1A CN103994216B (en) | 2014-05-14 | 2014-05-14 | Manual steering hydraulic power tractor hydraulic control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103994216A CN103994216A (en) | 2014-08-20 |
| CN103994216B true CN103994216B (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410202222.1A Expired - Fee Related CN103994216B (en) | 2014-05-14 | 2014-05-14 | Manual steering hydraulic power tractor hydraulic control system |
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| CN (1) | CN103994216B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105315030B (en) * | 2014-11-18 | 2019-05-31 | 保定市金甲农牧机械有限公司 | A kind of hydraulic crawler turning machine |
| CN104627916B (en) * | 2015-02-01 | 2017-01-18 | 浙江大学 | Steel cable tension equalization equipment with adjustable tensioning force |
| CN105545843A (en) * | 2016-02-14 | 2016-05-04 | 秦皇岛燕大一华机电工程技术研究院有限公司 | Hydraulic control system of self-propelled hydraulic power traction vehicle |
| CN106954401B (en) * | 2017-04-13 | 2023-04-28 | 农业部南京农业机械化研究所 | Manual and automatic navigation integrated track combine harvester steering system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2641926C3 (en) * | 1976-09-17 | 1981-10-15 | Emil Weber Fabrik für Ölhydraulik GmbH & Co, 7129 Güglingen | Cab tilting device |
| CN2823628Y (en) * | 2005-09-14 | 2006-10-04 | 刘建 | Electric manual dual-purpose hydraulic station |
| CN203333196U (en) * | 2013-07-05 | 2013-12-11 | 烟台大海机械制造有限公司 | Tower crane hydraulic jacking device |
| CN203516244U (en) * | 2013-08-02 | 2014-04-02 | 浙江工商职业技术学院 | Fast feed and working feed circuit |
| CN203880067U (en) * | 2014-05-14 | 2014-10-15 | 江苏海鹏特种车辆有限公司 | Hydraulic control system of manual-steering hydraulic power tractor |
-
2014
- 2014-05-14 CN CN201410202222.1A patent/CN103994216B/en not_active Expired - Fee Related
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| CN103994216A (en) | 2014-08-20 |
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Granted publication date: 20160511 Termination date: 20170514 |