CN203758732U - Electro-hydraulic suspension loading experiment table of tractor - Google Patents
Electro-hydraulic suspension loading experiment table of tractor Download PDFInfo
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- CN203758732U CN203758732U CN201420116995.3U CN201420116995U CN203758732U CN 203758732 U CN203758732 U CN 203758732U CN 201420116995 U CN201420116995 U CN 201420116995U CN 203758732 U CN203758732 U CN 203758732U
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Abstract
The utility model relates to an electro-hydraulic suspension loading experiment table of a tractor. The experiment table comprises a pedestal of the experiment table and a frame mounted at one end of the pedestal. A control cabinet is mounted in the frame, the side plate, orientated to the internal of the experiment table, of the frame is provided with a lifting cylinder which is connected with the control cabinet, the lifting cylinder is connected with lifting arms via transmission shafts, the lifting arms are respectively arranged at the two ends of the top of the side plate, each lifting arm is connected with a lower pull rod via a lifting rod, the lower pull rod is mounted at the bottom of an experimental plough stock, the top of the experimental plough stock is movably connected with an upper pull rod which is hinged to the side plate, the bottom end of the experimental plough stock is provided with a loading oil cylinder and a damping cylinder, and a piston rod of the loading oil cylinder is provided with a first pressure sensor. The electro-hydraulic suspension loading experiment table of the tractor has the advantages of reasonable design, simple loading manner and high precision and automation degree, can realize automatic loading, and enables manual operation via buttons on the control cabinet.
Description
Technical field
The utility model relates to a kind of experimental provision for the research and development of large-scale farm machinery key position, production and performance test, and especially a kind of tractor electro-hydraulic hitch loading experiment platform, belongs to agricultural machinery technological field.
Background technology
In recent years, tractor electro-hydraulic hitch control technology is paid attention to widely, just day by day becomes main configuration and the developing direction of tractor suspension system.On Field-working Tractor-implement unit, just extensively adopt electric-controlled hydraulic suspension to realize the regulating and controlling of farm implements.Due to the automatic control process more complicated of hydraulic lift system in reality, solution procedure is very loaded down with trivial details, therefore according to the principle of work of tractor resistance regulating system and hydraulic system signal transduction process, set up Characteristics of Tractor Hydraulic Suspension System nature imitation experiment device.Existing tractor hangs not only mechanical mechanism complexity of loading experimental apparatus, and loading accuracy is low, and automaticity is low, thereby causes experimental result error larger, and efficiency is lower.Along with tractor is more and more higher to the requirement of tilling depth control accuracy, existing loading system has been difficult to meet its requirement, in order further to meet the research of hanging automatic control tilling depth control strategy, need a kind of electric liquid loading experiment platform that can the suffered soil resistance of real simulation plough body and can respond rapidly and accurately.
Utility model content
The purpose of this utility model is: the problem existing for above-mentioned prior art, proposes a kind of load mode simple, the tractor electro-hydraulic hitch loading experiment platform that degree of accuracy is high.
In order to reach above object, the utility model tractor electro-hydraulic hitch loading experiment platform, comprise experiment table base and the framework that is arranged on base one end, its improvements are, switch board is installed in described framework, on the side plate of experiment table inside, be provided with the lift cylinder being connected with switch board at described framework, described lift cylinder is connected with the lift arm that is arranged on two ends, side plate top by transmission shaft, wherein said lift arm is connected with the lower link that is arranged on experiment plow frame bottom by lifting arm, the top of described experiment plow frame is flexibly connected with the upper connecting rod being hinged on side plate, the bottom of described experiment plow frame is provided with load cylinder and damped cylinder, the piston rod of described load cylinder is provided with the first pressure transducer.Load cylinder acts on triangular pyramidal plow frame, the steady state force of the horizontal and vertical direction that while can be used to simulate farming, plough body is subject in the time of a certain tilling depth, and damped cylinder is dynamic force plough body being produced for simulated soil, it acts on plow frame is to change for simulating plough body the dynamic force being subject to tilling depth, like this, by testing loading, the soil resistance that just can simulate ploughing soil time, the warping surface of plow bottom is subject to hanging plow frame.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, the outside that is positioned at therein lower link on described side plate is provided with gag lever post, and wherein said gag lever post is flexibly connected with lower link.Gag lever post can be used to prevent from testing plow frame double swerve in the time being subject to soil resistance.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, the upper end of wherein said damped cylinder is provided with the unhook being used in conjunction with the suspension ring that are arranged on experiment plow frame bottom, and lower end is provided with the second pressure transducer.Adopting breaks off relations can realize damped cylinder and disengaging and the binding function of testing plow frame under level altitude, like this, in the time that the suspension of damped cylinder top rises to certain altitude, while being plough body disengaging soil surface, the unhook meeting of damped cylinder upper end and plow frame automatic trip from, plow frame will can not be subject to the dynamic resistance from damped cylinder, in the time that suspension drops to plough body contact soil surface, break off relations and be automatically connected with plow frame, after this plow frame can be subject to again the dynamic antivibration power from soil.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, the head end of wherein said load cylinder is connected with experiment plow frame by coupling shaft, tail end is arranged on base by fixed leg, top at described fixed leg is vertically shaped with chute, and the tail end mounting portion of described load cylinder is provided with the bolt coordinating with chute.Like this, the link position between load cylinder and fixed leg is adjustable, can change the angle of load cylinder and surface level by chute, realizes the variation of load angle, and then realizes the control of the loading direction to stable state loading force.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, wherein said load cylinder by oil pump by working connection pipeline oil supply, described working connection is communicated with fuel tank, is provided with successively from the bottom to top oil absorption filter, retaining valve, in-line filter and solenoid directional control valve in described working connection; The arm that passes through that described working connection is positioned at solenoid directional control valve below is connected with superposing type overflow relief valve, proportional pressure control valve, described superposing type overflow relief valve, proportional pressure control valve are parallel to respectively working connection, and described proportional pressure control valve, solenoid directional control valve are connected with the control output end of ECU controller respectively.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, wherein said superposing type overflow relief valve, proportional pressure control valve are connected with auxiliary oil way by arm, and the upper end of described auxiliary oil way is connected with solenoid directional control valve, and lower end is connected with fuel tank.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, wherein said working connection is connected with regulating oil circuit by connecting pipe, the lower end of described adjusting oil circuit is communicated with fuel tank, and in adjusting oil circuit, be provided with successively from the bottom to top high-pressure ball valve and accumulator, described connecting pipe is connected with the 3rd tensimeter by the 3rd hydraulic quick coupling.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, the side that wherein said working connection is positioned at solenoid directional control valve top is connected with the first oil pressure sensor by the first hydraulic quick coupling, opposite side is connected with the second oil pressure sensor by the second hydraulic quick coupling, and described first, second oil pressure sensor and the first pressure transducer are connected with the signal input part of ECU controller.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, wherein said oily Pump and Electromotor connects, and described motor is connected with the control output end of switch board.
Aforesaid tractor electro-hydraulic hitch loading experiment platform, one end of wherein said lower link is arranged on side plate by hinged seat, and the other end is flexibly connected with experiment plow frame; The lower end of described lift cylinder is by hinged seat and side plate active link, and upper end is connected with lift arm by transmission shaft, web member, is shaped with the axis hole matching with transmission shaft on described web member.
The utility model has the advantage of: the utility model is reasonable in design, load mode is simple, degree of accuracy is high, adopt electric-controlled hydraulic load mode to replace loaded down with trivial details mechanical load structure, in realizing horizontal force and vertical force loading, can meet the needs of the suffered soil resistance of simulation plough body, and hang load-carrying capacity and test, automaticity is high, not only can realize robotization and load, and can also carry out manual operation by the button on switch board.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is further described.
Fig. 1 is the structural representation of the utility model embodiment mono-.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 hangs loading oil circuit figure in the utility model.
In figure: 1 left side, right lift arm, 2 lift cylinder, 3 left sides, right lifting arm, 4 upper connecting rods, 5 left sides, bottom right pull bar, 6 experiment plow frames, 7 left sides, right limit bar, 8 fixed legs, 9 load cylinders, 10 damped cylinders, 11 switch boards, 12 first pressure transducers, 13 second pressure transducers, 14 break off relations, 15 liquid level gauges, 16 air strainers, 17 oil absorption filters, 18 oil pumps, 19 motors, 20 retaining valves, 21 in-line filters, 22 the 3rd tensimeters, 23 high-pressure ball valves, 24 accumulators, 25 proportional pressure control valves, 26 superposing type overflow relief valves, 27 solenoid directional control valves, 28 first oil pressure sensors, 29 second oil pressure sensors, 30 first tensimeters, 31 second tensimeters, 32 ECU controllers, 33 fuel tanks, 34 first hydraulic quick couplings, 35 second hydraulic quick couplings, 36 the 3rd hydraulic quick couplings, 37 bases, 38 frameworks, 39 side plates.
Embodiment
Embodiment mono-
The tractor electro-hydraulic hitch loading experiment platform of the present embodiment, its structure as depicted in figs. 1 and 2, comprise experiment table base 37 and the framework 38 that is arranged on base 37 one end, the interior installation switch board 11 of framework 38, on the side plate 39 of experiment table inside, be provided with the lift cylinder 2 being connected with switch board 11 at framework 38, lift cylinder 2 is by transmission shaft and a left side that is arranged on side plate 39 two ends, top, right lift arm 1 connects, be that the lower end of lift cylinder 2 is by hinged seat and side plate 39 active links, transmission shaft is passed through in upper end, web member is connected with lift arm 1, on web member, be shaped with the axis hole matching with transmission shaft.Wherein, single lift arm is connected with the lower link 5 that is arranged on experiment plow frame 6 bottoms by lifting arm 3, the top of experiment plow frame 6 is flexibly connected with the upper connecting rod 4 being hinged on side plate 39, one end of lower link 5 is arranged on side plate 39 by hinged seat, the other end is flexibly connected with experiment plow frame 6, and the other end is provided with the axis hole matching with the coupling shaft that is arranged on experiment plow frame 6 bottoms.The bottom of experiment plow frame 6 is provided with load cylinder 9 and damped cylinder 10, the piston rod of load cylinder 9 is provided with the first pressure transducer 12, and the head end of load cylinder 9 is connected with experiment plow frame 6 by coupling shaft, tail end is arranged on base 37 by fixed leg 8, top at fixed leg 8 is vertically shaped with chute, and the tail end mounting portion of load cylinder 9 is provided with the bolt coordinating with chute.The upper end of damped cylinder 10 is provided with the unhook 14 being used in conjunction with the suspension ring that are arranged on experiment plow frame 6 bottoms, lower end is provided with the second pressure transducer 13, damped cylinder 10 adopts the manually passive hydraulic oil cylinder of auxiliary adjustment damping force, in the time that tilling depth changes continuously, damped cylinder 10 will produce corresponding damping force, the second pressure transducer 13 Real-time Feedback pressure signals are to switch board 11(buyable simultaneously), switch board 11, again according to the damping force of information damping adjusting cylinder 10, is realized the accurate loading of dynamic force.Wherein, first, second pressure transducer 12,13 is axial pin type pull pressure sensor (buyable).In addition, the outside that is positioned at left and right lower link 5 on side plate 39 is provided with left and right gag lever post 7, and left and right gag lever post 7 is flexibly connected with left and right lower link 5 respectively by bearing-ring device.
Load cylinder 9 is by oil pump 18 by working connection pipeline oil supply, and oil pump 18 is connected with motor 19, and motor 19 is connected with the control output end of switch board 11.Working connection is communicated with fuel tank 33, is provided with liquid level gauge 15 and air strainer 16 in fuel tank 33.In working connection, be provided with successively from the bottom to top oil absorption filter 17, retaining valve 20, in-line filter 21 and solenoid directional control valve 27, in working connection, be positioned at the pipeline of solenoid directional control valve 27 tops, one side is connected with the first oil pressure sensor 28 by the first hydraulic quick coupling 34, opposite side is connected with the second oil pressure sensor 29 by the second hydraulic quick coupling 35, first, second oil pressure sensor 28,29 and the first pressure transducer 12 are connected with the signal input part of ECU controller 32, wherein ECU controller 32 is the control device based on single-chip microcomputer C8051F040, buyable.The first hydraulic quick coupling 34 is connected with the first tensimeter 30 by connecting branch, and the second hydraulic quick coupling 34 is connected with the second tensimeter 31 by connecting branch.The device for cleaning pipeline that is positioned at solenoid directional control valve 27 belows in working connection is crossed arm and is connected with superposing type overflow relief valve 26, proportional pressure control valve 25, superposing type overflow relief valve 26, proportional pressure control valve 25 are parallel to respectively working connection, when loading, work as and occur that oil piping system pressure exceedes load rated safety value phenomenon, superposing type overflow relief valve 26 can play timely pressure release, the effect of protection oil circuit; Proportional pressure control valve 25, solenoid directional control valve 27 are connected with the control output end of ECU controller 32 respectively, ECU controller 32 is by the continuous variation of control ratio surplus valve 25 input voltages, realize the control of comparative example surplus valve 25 oil pressure reliefs, further realize the stable state loading force control to load cylinder 9, and solenoid directional control valve 27 can be realized the break-make of load cylinder 9 loading forces under the control of ECU controller 32.Superposing type overflow relief valve 26, proportional pressure control valve 25 are connected with auxiliary oil way by arm again, and superposing type overflow relief valve 26, proportional pressure control valve 25 the two parallel connection, and the upper end of auxiliary oil way is connected with solenoid directional control valve 27, and lower end is connected with fuel tank 33.Working connection is connected with regulating oil circuit by connecting pipe, regulate the lower end of oil circuit to be communicated with fuel tank 33, and in adjusting oil circuit, be provided with successively from the bottom to top high-pressure ball valve 23 and accumulator 24, high-pressure ball valve 23 is positioned at this connecting pipe below, be to regulate the switch of oil circuit, at working connection, during in stress state, high-pressure ball valve 23 is closed, regulate between oil circuit and fuel tank 33 and be not communicated with, can stablize the pressure of whole system; When working connection is during in unloading condition, high-pressure ball valve 23 is opened, and regulates oil circuit to be communicated with fuel tank 33, plays the effect into working connection pressure release, makes the hydraulic oil in working connection get back to fuel tank 33 through adjusting oil circuit.Retaining valve 20 and high-pressure ball valve 23 are used in conjunction with, and play loading pressurize, the effect of unloading dividing potential drop.Accumulator 24 is positioned at the top of connecting pipe, be communicated with working connection, in the time of solenoid directional control valve 27 commutation suddenly, now superposing type overflow relief valve 26 reacts not yet in time always, accumulator 24 just absorbs the hydraulic shock being come by working connection in time, to ensure that system pressure can fiercely not raise suddenly.In addition, connecting pipe is connected with the 3rd tensimeter 22 by the 3rd hydraulic quick coupling 36, and wherein tensimeter can show oil pressure, plays personal monitoring's object.
In addition, switch board 11 is also connected with valve in load cylinder 9, damped cylinder 10, the second pressure transducer 13 and loading oil circuit, tensimeter, filtrator etc.The Electronic Control that comprises whole loading experiment platform in switch board 11 and hydraulic circuit part, and be provided with action button on the front panel of switch board 11, be used for controlling whole electric liquid loading experiment platform.
When work, first switch board 11 is controlled lift cylinder 2 and is moved, drive left and right lift arm 1 to move up and down, drive successively more left and right lifting arm 3 and left and right lower link 5 to move up and down, in order to promote or the experiment plow frame 6 that falls, to make to test plow frame 6 variation that realizes tilling depth along the movement locus of upper connecting rod 4.Then carry out starter motor 19 by switch board 11, oil pump 18 is worked, hydraulic oil in driving fuel tank 33 is through working connection pipeline flow-direction solenoid directional control valve 27, and hydraulic oil is finally delivered to load cylinder 9 through solenoid directional control valve 27, and the oil absorption filter 17 in working connection plays the effect of filtered fluid pressure well cuts.When loading, ECU controller 32 is controlled the electromagnetic relay motion on solenoid directional control valve 27, make solenoid directional control valve 27 in left position loading position, working connection is connected, simultaneously ECU controller 32 sends pressure regulation signal to proportional pressure control valve 25, to regulate its oil pressure relief, makes to regulate hydraulic oil after pressure to flow to the rodless cavity of load cylinder 9 through solenoid directional control valve 27, thereby make the piston rod of load cylinder 9 produce the thrust to experiment plow frame 6, act on the stable state resistance of experiment plow frame 6; In the time stopping loading, the electromagnetic relay that ECU controller 32 is controlled solenoid directional control valve 27 disconnects, make solenoid directional control valve 27 in right position unloaded position, working connection is obstructed in depressurization phase, the piston rod that the hydraulic oil of load cylinder 9 is got back to fuel tank 33 load cylinders 9 does not produce thrust to experiment plow frame 6, and the hydraulic oil of meanwhile oil pump output is got back to fuel tank 33 through proportional pressure control valve 25 and high-pressure ball valve 23.When experiment loads, the force signal detecting is in real time delivered to ECU controller 32 by the first pressure transducer 12 on load cylinder 9, fuel injection pressure signal is delivered to ECU controller 32 by first, second oil pressure sensor 28,29 simultaneously, ECU controller 32 is processed above-mentioned signal, when the thrust producing when load cylinder 9 does not reach desired value, ECU controller 32 sends compensating signal to proportional pressure control valve 25, by regulating the oil pressure relief of proportional pressure control valve 25 to change the loading force of load cylinder 9, make the thrust of its generation reach target.Adopt close-loop control mode, regulate by PID, can realize the accurate control in above-mentioned stable state is loaded.In addition, when experiment plow frame 6 is while moving up and down, damped cylinder 10 produces corresponding damping force, and by the second pressure transducer 13 Real-time Feedback pressure signals to switch board 11, the damping force of switch board 11 and then damping adjusting cylinder 10, realizes the accurate loading of dynamic force.
In addition to the implementation, the utility model also can have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, drop on the protection domain of the utility model requirement.
Claims (10)
1. a tractor electro-hydraulic hitch loading experiment platform, comprise experiment table base and the framework that is arranged on base one end, it is characterized in that: switch board is installed in described framework, on the side plate of experiment table inside, be provided with the lift cylinder being connected with switch board at described framework, described lift cylinder is connected with the lift arm that is arranged on two ends, side plate top by transmission shaft, described lift arm is connected with the lower link that is arranged on experiment plow frame bottom by lifting arm, the top of described experiment plow frame is flexibly connected with the upper connecting rod being hinged on side plate, the bottom of described experiment plow frame is provided with load cylinder and damped cylinder, the piston rod of described load cylinder is provided with the first pressure transducer.
2. tractor electro-hydraulic hitch loading experiment platform according to claim 1, is characterized in that: the outside that is positioned at lower link on described side plate is provided with gag lever post, and wherein said gag lever post is flexibly connected with lower link.
3. tractor electro-hydraulic hitch loading experiment platform according to claim 1, is characterized in that: the upper end of described damped cylinder is provided with the unhook being used in conjunction with the suspension ring that are arranged on experiment plow frame bottom, and lower end is provided with the second pressure transducer.
4. tractor electro-hydraulic hitch loading experiment platform according to claim 1, it is characterized in that: the head end of described load cylinder is connected with experiment plow frame by coupling shaft, tail end is arranged on base by fixed leg, top at described fixed leg is vertically shaped with chute, and the tail end mounting portion of described load cylinder is provided with the bolt coordinating with chute.
5. tractor electro-hydraulic hitch loading experiment platform according to claim 4, it is characterized in that: described load cylinder by oil pump by working connection pipeline oil supply, described working connection is communicated with fuel tank, is provided with successively from the bottom to top oil absorption filter, retaining valve, in-line filter and solenoid directional control valve in described working connection; The arm that passes through that described working connection is positioned at solenoid directional control valve below is connected with superposing type overflow relief valve, proportional pressure control valve, described superposing type overflow relief valve, proportional pressure control valve are parallel to respectively working connection, and described proportional pressure control valve, solenoid directional control valve are connected with the control output end of ECU controller respectively.
6. tractor electro-hydraulic hitch loading experiment platform according to claim 5, it is characterized in that: described superposing type overflow relief valve, proportional pressure control valve are connected with auxiliary oil way by arm, the upper end of described auxiliary oil way is connected with solenoid directional control valve, and lower end is connected with fuel tank.
7. tractor electro-hydraulic hitch loading experiment platform according to claim 5, it is characterized in that: described working connection is connected with regulating oil circuit by connecting pipe, the lower end of described adjusting oil circuit is communicated with fuel tank, and in adjusting oil circuit, be provided with successively from the bottom to top high-pressure ball valve and accumulator, described connecting pipe is connected with the 3rd tensimeter by the 3rd hydraulic quick coupling.
8. tractor electro-hydraulic hitch loading experiment platform according to claim 5, it is characterized in that: the side that described working connection is positioned at solenoid directional control valve top is connected with the first oil pressure sensor by the first hydraulic quick coupling, opposite side is connected with the second oil pressure sensor by the second hydraulic quick coupling, and described first, second oil pressure sensor and the first pressure transducer are connected with the signal input part of ECU controller.
9. tractor electro-hydraulic hitch loading experiment platform according to claim 5, is characterized in that: described oily Pump and Electromotor connects, and described motor is connected with the control output end of switch board.
10. tractor electro-hydraulic hitch loading experiment platform according to claim 1, is characterized in that: one end of described lower link is arranged on side plate by hinged seat, and the other end is flexibly connected with experiment plow frame; The lower end of described lift cylinder is by hinged seat and side plate active link, and upper end is connected with lift arm by transmission shaft, web member, is shaped with the axis hole matching with transmission shaft on described web member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420116995.3U CN203758732U (en) | 2014-03-14 | 2014-03-14 | Electro-hydraulic suspension loading experiment table of tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420116995.3U CN203758732U (en) | 2014-03-14 | 2014-03-14 | Electro-hydraulic suspension loading experiment table of tractor |
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| Publication Number | Publication Date |
|---|---|
| CN203758732U true CN203758732U (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420116995.3U Expired - Fee Related CN203758732U (en) | 2014-03-14 | 2014-03-14 | Electro-hydraulic suspension loading experiment table of tractor |
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| CN (1) | CN203758732U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104541636A (en) * | 2014-12-30 | 2015-04-29 | 江苏大学 | Electric control method and electric control device for adjustment of hydraulic suspension position of tractor |
| CN104782259A (en) * | 2014-12-29 | 2015-07-22 | 江苏大学 | Tractor operating depth resistance-position adjusting electric control device and method |
| CN106568587A (en) * | 2016-11-02 | 2017-04-19 | 上海航天设备制造总厂 | Different-direction synchronous load test device and use method thereof |
| CN107063651A (en) * | 2016-12-07 | 2017-08-18 | 北京农业智能装备技术研究中心 | A kind of full landform excitation test platform in tractor suspension system farmland |
| CN108519187A (en) * | 2018-05-17 | 2018-09-11 | 吉林大学 | A kind of tractor hydraulic promotes force measuring system and measurement method |
| CN109854554A (en) * | 2018-08-30 | 2019-06-07 | 北京农业智能装备技术研究中心 | A kind of tractor rear linkage and its control method |
| CN110617975A (en) * | 2019-10-28 | 2019-12-27 | 南京工业大学 | Tractor linkage tensile test platform |
-
2014
- 2014-03-14 CN CN201420116995.3U patent/CN203758732U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104782259A (en) * | 2014-12-29 | 2015-07-22 | 江苏大学 | Tractor operating depth resistance-position adjusting electric control device and method |
| CN104541636A (en) * | 2014-12-30 | 2015-04-29 | 江苏大学 | Electric control method and electric control device for adjustment of hydraulic suspension position of tractor |
| CN106568587A (en) * | 2016-11-02 | 2017-04-19 | 上海航天设备制造总厂 | Different-direction synchronous load test device and use method thereof |
| CN107063651A (en) * | 2016-12-07 | 2017-08-18 | 北京农业智能装备技术研究中心 | A kind of full landform excitation test platform in tractor suspension system farmland |
| CN108519187A (en) * | 2018-05-17 | 2018-09-11 | 吉林大学 | A kind of tractor hydraulic promotes force measuring system and measurement method |
| CN109854554A (en) * | 2018-08-30 | 2019-06-07 | 北京农业智能装备技术研究中心 | A kind of tractor rear linkage and its control method |
| CN110617975A (en) * | 2019-10-28 | 2019-12-27 | 南京工业大学 | Tractor linkage tensile test platform |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20150314 |
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| EXPY | Termination of patent right or utility model |