CN203670329U - Novel hydraulic control system of combine harvester - Google Patents
Novel hydraulic control system of combine harvester Download PDFInfo
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- CN203670329U CN203670329U CN201320862187.7U CN201320862187U CN203670329U CN 203670329 U CN203670329 U CN 203670329U CN 201320862187 U CN201320862187 U CN 201320862187U CN 203670329 U CN203670329 U CN 203670329U
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Abstract
The utility model relates to a hydraulic control system, in particular to a novel hydraulic control system of a combine harvester. The novel hydraulic control system of the combine harvester mainly solves the technical problems that in the prior art, when a work mechanism hydraulic system of the combine harvester operates a plurality of valves at the same time, the maximum output pressure of a pump will exceed the ultimate pressure borne by the system, so that the hydraulic pump and a pipeline are quite prone to damage; although the difference between the actual flow demands of all work mechanisms is large, the work pump supplies full flow to each reversing valve, as a result, the flow demands of all the work mechanisms cannot be met at the same time, and the controllability is poor. The novel hydraulic control system of the combine harvester is composed of a two-way slide valve, a reel one-way slide valve and an unloading one-way slide valve, wherein the two-way slide valve is connected with a header cylinder, a left steering cylinder and a right steering cylinder through a pipeline, the reel one-way slide valve is connected with a reel cylinder through a pipeline, the unloading one-way slide valve is connected with an unloading cylinder through a pipeline, and oil return openings of the two-way slide valve, the reel one-way slide valve and the unloading one-way slide valve are connected in parallel.
Description
Technical field
The utility model relates to a kind of hydraulic control system, especially relates to a kind of Combined harvester hydraulic control system.
Background technique
At present, crops harvestings is the hand-held reaping hook Manpower harvester of peasant substantially, and because its rice shoot of establishing in large scale is mostly crawled on ground, harvesting is wasted time and energy, and its deficiency is, needs manpower many, and labor intensity is large, and efficiency is low.Chinese patent discloses a kind of rape, rice wheat combine harvester (publication number: CN 103125203 A), it comprises frame, power mechanism, rack-mounted header mechanism, separating mechanism after header mechanism, feeding mechanism, the grain shell segregating unit that separating mechanism grain export connects; Wherein grain shell segregating unit involving vibrations sorting screen, blow shell blower fan, go out faucal; Vibration sorting screen comprises the vibration sorting screen basket being driven by power mechanism, is connected to upper strata sieve adjustable-angle sieve and lower floor's net form sieve on vibration sorting screen basket; Sieve adjustable-angle sieve comprises that two ends are through the sieve bar of parallel arrangement on vibration sorting screen basket side, is fixed on the sieve on sieve bar, sieve bar and adjustment sheet cooperation place u forming, and adjustment sheet is connected on adjustable lever, and adjustable lever is connected with regulating handle; Sieve is n shape sieve or triangle sieve, and every tight dust and is fixed on sieve bar; Sieve adjustable-angle sieve is for two-layer; be fixed on vibration sorting screen basket at the anterior sieve of separating mechanism grain export jointing bar compared with last layer; sieve on it is fish scale shape sieve; I am semiclosed for the mesh of screen cloth; thereafter for the sieve of adjustable-angle and extend to vibration sorting screen basket middle part; descending one deck is all the sieve of adjustable-angle, and it extends to out faucal place from fish scale shape sieve tail end.When but this combine-harvester operation mechanism hydraulic system operates multiple valve at the same time, the delivery pressure of pump is the pressure sum of each valve load, the conference of this pressure exceedes the ultimate pressure that system can bear, very easily damage oil hydraulic pump and pipeline, and each operation mechanism actual flow demand difference is very large, but working pump always full flow is supplied with each selector valve, this just cannot meet the traffic demand of each operation mechanism, poor controllability simultaneously.
Model utility content
The utility model is to provide a kind of Combined harvester hydraulic control system, it is mainly when solving prior art existing combine-harvester operation mechanism hydraulic system and operating multiple valve at the same time, the delivery pressure of pump is the pressure sum of each valve load, the conference of this pressure exceedes the ultimate pressure that system can bear, very easily damage oil hydraulic pump and pipeline, and each operation mechanism actual flow demand difference is very large, but working pump always full flow is supplied with each selector valve, this just cannot meet the traffic demand of each operation mechanism simultaneously, the technical problem of poor controllability etc.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals:
A kind of Combined harvester hydraulic control system of the present utility model, formed by two-way guiding valve, winder single channel guiding valve, three valves of unloading single channel guiding valve, it is characterized in that described two-way guiding valve is connected with ceding of Taiwan cylinder, left steering cylinder, right steering cylinder by pipeline, winder single channel guiding valve is connected with winder cylinder by pipeline, unloading single channel guiding valve is connected with unloading cylinder by pipeline, and the return opening of two-way guiding valve, winder single channel guiding valve, unloading single channel guiding valve is by being connected in parallel.Between each selector valve, adopt parallel-connection structure, while having avoided handling several valve, the problem of pressure superposition, has protected oil hydraulic pump and pipeline simultaneously.
As preferably, described two-way guiding valve includes two-way guiding valve valve body, in two-way guiding valve valve body, be arranged with two-way guiding valve plunger, ceding of Taiwan valve rod, pressure compensation spool in parallel, two-way guiding valve plunger is connected with the first hydraulic lock spool, the first hydraulic lock spool is provided with the first hydraulic lock valve gap outward, and it is stifled that the outer end of the first hydraulic lock spool is connected with the first lock; Ceding of Taiwan valve rod is connected with the first spring, is provided with A1 chamber, B1 chamber, T chamber, LS chamber in the valve pocket at ceding of Taiwan valve rod place; Pressure compensation spool is connected with the second spring, and the outer end of pressure compensation spool is provided with high-pressure overflow valve, is provided with P1 chamber, P chamber, P2 chamber, LS chamber in the valve pocket at pressure compensation spool place; P2 chamber is communicated with respectively low pressure relief valve, speed governing spool, throttling screw plug, and speed governing spool connects the 3rd spring, and the valve pocket at speed governing spool place is communicated with P3 chamber; In two-way guiding valve valve body, be also provided with and turn to valve rod, turn in the valve pocket at valve rod place and be provided with T chamber, C2 chamber, P3 chamber, D2 chamber, A2 chamber, B2 chamber.
Pump comes the oily P chamber that enters, in the time of all valve rods of inoperation, P chamber is next oily enters pressure compensation spool left end via the aperture in pressure compensation spool, the spring force that overcomes the second spring moves right, the passage of opening between P and P2 enters P2 chamber, then after the throttling of throttling screw plug, enter the oil suction chamber of each selector valve in parallel below.In the time of all commutation valve rods of inoperation, this fluid, via the straight-through oil circuit of each selector valve meta oil circuit below, is realized Low-pressure load discharge.Throttling screw plug is is herein imported and exported P2, P3 and is communicated with control chamber, the spring chamber of speed governing spool respectively.When the flow through throttling screw plug 16 restrictions hour, before and after restriction, pressure reduction is less, speed governing spool is failure to actuate under the pre-compression force of the 3rd spring; In the time that the flow of the throttling screw plug restriction of flowing through exceedes the flow value of setting, before and after restriction, pressure reduction becomes large, makes speed governing spool overcome the 3rd spring force and moves to left, open the passage of P2 and oil back chamber T, unnecessary flow off-load, therefore the flow substantially constant in P3 chamber plays the object of speed governing.In the time that different type of machines is different to traffic demand, can realize easily by the size of restriction on change throttling screw plug.
When operation ceding of Taiwan valve rod stretches out or advances, the opening of LS chamber and T oil back chamber is closed, and A1 or B1 working hole are connected by the hole on ceding of Taiwan valve rod and LS, and two ends, pressure compensation spool left and right pressure reduction is P1-P2, is the pressure reduction that ceding of Taiwan valve rod valve port produces.According to restriction flow formula
, at pressure reduction
=P1-P2 is constant, choke area f is also in constant situation, and the flow Q of the valve port of flowing through is constant.Herein because the second spring is softer, therefore
=P1-P2 ≈ is constant, i.e. pressure reduction
constant condition is set up, and goes the flow of ceding of Taiwan oil cylinder and its load irrelevant, is only directly proportional to valve rod opening area, namely only relevant with valve rod travel, realizes proportional control.In the time that the ceding of Taiwan joins required flow less (ceding of Taiwan valve rod opening is little), pressure compensation spool moves to right under the effect of pressure reduction, unnecessary flow enters P2 chamber, enters the oil suction chamber P3 of several way reversing valves below after series flow control valve speed governing, i.e. the ceding of Taiwan can be moved with several roads below simultaneously.Need whole flow work when (ceding of Taiwan valve rod opening is large) in the ceding of Taiwan, pressure compensation spool resets, after several roads do not have flow to supply with, akinesia, realizes ceding of Taiwan priority function.
The working connection of ceding of Taiwan connection is: in the time that operation ceding of Taiwan valve rod stretches out, P chamber is come oily via P-P1-A1 passage, opens hydraulic lock spool, enters ceding of Taiwan oil cylinder by actuator port, realizes the rising of the ceding of Taiwan.In the time that operation ceding of Taiwan valve rod advances, P chamber is come oily via P-P1-B1 passage, enters the control chamber on plunger 4 left sides, promotion plunger moves right, back down hydraulic lock spool, the pressure oil of the ceding of Taiwan oil cylinder oil sump tank that communicates with oil back chamber T through A1 chamber, the ceding of Taiwan declines under Action of Gravity Field.
When operation turns to valve rod, first cut off the oil circuit between P3 chamber and C2 chamber, then P3 chamber and A2 chamber or B2 chamber are connected, and pressure oil enters right steering cylinder or left steering cylinder by P3, A2 or B2, promotes corresponding oil cylinder movement, realize vehicle and turn right or turn left.Turn to the fluid of return opening to connect oil return through D2 mouth and oil back chamber T simultaneously.
The effect of high-pressure overflow valve is restriction ceding of Taiwan connection maximum pressure, prevents ceding of Taiwan connection overload.The effect of low pressure relief valve is restriction each commutation connection maximum pressure below, prevents each commutation connection overload below.
As preferably, described winder single channel guiding valve includes winder valve body, in winder valve body, be arranged with winder plunger, winder valve rod in parallel, winder plunger is connected with the second hydraulic lock spool, the second hydraulic lock spool is provided with the second hydraulic lock valve gap outward, and it is stifled that the outer end of the second hydraulic lock spool is connected with the second lock; In the valve pocket at winder valve rod place, be provided with T chamber, B3 chamber, P3 chamber, A3 chamber, C2 chamber, C3 chamber, winder valve rod is connected with the 4th spring.
When the each valve rod of inoperation, as mentioned above, the oil in C2 chamber leads to next connection selector valve meta oil suction chamber via C3 chamber, then by next connection meta oil return, realizes oil hydraulic pump off-load.When P3 chamber has flow to supply with, operation winder valve rod stretches out, and the passage between C2 and C3 chamber is cut off, meanwhile, P3 chamber and A3 chamber are connected, and the pressure oil in P3 chamber thus passage removes hydraulic lock spool front end, open hydraulic lock spool, enter winder cylinder, realize the rising of winder cylinder.In like manner, when operation winder valve rod advances, passage between C2 and C3 chamber is cut off, meanwhile, P3 chamber and B3 chamber are connected, and A3 chamber and oil back chamber T connect, the pressure oil in P3 chamber enters the control end on the winder plunger left side, promotion winder plunger moves to right and opens hydraulic lock guiding valve, and the pressure oil in winder cylinder is connected oil return through hydraulic lock valve port of slide valve, A3 chamber and oil back chamber T, and winder cylinder is realized decline under the deadweight of winder mechanism.
As preferably, described unloading single channel guiding valve includes unloading valve body, is provided with unloading valve rod in unloading valve body, is provided with T chamber, B4 chamber, P3 chamber, A4 chamber, C3 chamber, C4 chamber in the valve pocket at unloading valve rod place, and unloading valve rod is connected with the 5th spring.
When the each valve rod of inoperation, as mentioned above, the oil in C2 chamber leads to next connection selector valve meta oil suction chamber via C3 chamber, then by next connection meta oil return, realizes oil hydraulic pump off-load.When P3 chamber has flow to supply with, operation unloading valve rod stretches out, and the passage between C3 and C4 chamber is cut off, and meanwhile, P3 chamber and A4 chamber are connected, and B4 chamber and oil back chamber T connect, the oil-feed of unloading cylinder rodless cavity, and the oil return of unloading cylinder rod chamber, realizes unloading cylinder and stretches out.In like manner, operation winder valve rod advances, and the passage between C2 and C3 chamber is cut off, and meanwhile, P3 chamber and B4 chamber are connected, and A4 chamber and oil back chamber T connect, the oil-feed of unloading cylinder rod chamber, and rodless cavity oil return, realizes unloading cylinder and retracts.
As preferably, the two ends of described ceding of Taiwan valve rod are respectively equipped with protecgulum, bonnet, and protecgulum place is provided with supporting screw.
As preferably, described two-way guiding valve plunger, the outer end of pressure compensation spool are provided with screw plug.
As preferably, the two ends of described winder valve rod are respectively equipped with protecgulum, bonnet.
As preferably, the two ends of described unloading valve rod are respectively equipped with protecgulum, bonnet.
Therefore, between the each selector valve of the utility model, adopt parallel-connection structure, while having avoided handling several valve, the problem of pressure superposition, has protected oil hydraulic pump and pipeline simultaneously; Before ceding of Taiwan selector valve, pressure-compensated valve is set, ceding of Taiwan working flow and the proportional relation of valve rod openings of sizes, realize the proportional control of taiwan cut off and landing speed, has load-sensitive control function; The ceding of Taiwan is preferential, i.e., when the ceding of Taiwan and other operation mechanisms work simultaneously, preferentially guarantee ceding of Taiwan action; Adopt overflowing and speed valve, series flow control valve each selector valve below can be worked under the flow of coupling, and working flow substantially constant, not affected by engine speed, controllability is good; On series flow control valve, adopt the throttle orifice of throttling screw plug formula, can, by changing the throttling screw plug of different big or small throttle orifices, reach the object of quick change flow, be suitable for different types.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of structural representation of the present utility model;
Accompanying drawing 2 is a kind of schematic diagrams of the present utility model;
Accompanying drawing 3 is a kind of structural representations of the utility model two-way guiding valve;
Accompanying drawing 5 is A-A cross-sectional view of Fig. 3;
Accompanying drawing 7 is C-C cross-sectional view of Fig. 4;
Accompanying drawing 8 is structural representations of the utility model winder single channel guiding valve;
Accompanying drawing 9 is structural representations of the utility model unloading single channel guiding valve.
Component in figure, position and numbering: ceding of Taiwan cylinder 1, left steering cylinder 2, right steering cylinder 3, winder cylinder 4, unloading cylinder 5, two-way guiding valve valve body 6, two-way guiding valve plunger 7, ceding of Taiwan valve rod 8, pressure compensation spool 9, the first hydraulic lock spool 10, the first hydraulic lock valve gap 11, the first lock stifled 12, the first spring 13, the second spring 14, high-pressure overflow valve 15, low pressure relief valve 16, speed governing spool 17, throttling screw plug 18, the 3rd spring 19, turn to valve rod 20, winder valve body 21, winder plunger 22, winder valve rod 23, the second hydraulic lock spool 24, the second hydraulic lock valve gap 25, the second lock stifled 26, the 4th spring 27, unloading valve body 28, unloading valve rod 29, the 5th spring 30, protecgulum 31, bonnet 32, supporting screw 33, screw plug 34.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of Combined harvester hydraulic control system of this example, as shown in Figure 1, Figure 2, formed by two-way guiding valve, winder single channel guiding valve, three valves of unloading single channel guiding valve, it is characterized in that described two-way guiding valve is connected with ceding of Taiwan cylinder 1, left steering cylinder 2, right steering cylinder 3 by pipeline, winder single channel guiding valve is connected with winder cylinder 4 by pipeline, unloading single channel guiding valve is connected with unloading cylinder 5 by pipeline, and the return opening of two-way guiding valve, winder single channel guiding valve, unloading single channel guiding valve is by being connected in parallel.
As Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, two-way guiding valve includes two-way guiding valve valve body 6, in two-way guiding valve valve body, be arranged with two-way guiding valve plunger 7, ceding of Taiwan valve rod 8, pressure compensation spool 9 in parallel, two-way guiding valve plunger is connected with the first hydraulic lock spool 10, the outer end that the first hydraulic lock spool is provided with the first hydraulic lock valve gap 11, the first hydraulic lock spools is outward connected with the first lock stifled 12; Ceding of Taiwan valve rod is connected with the first spring 13, is provided with A1 chamber, B1 chamber, T chamber, LS chamber in the valve pocket at ceding of Taiwan valve rod place; Pressure compensation spool is connected with the second spring 14, and the outer end of pressure compensation spool is provided with high-pressure overflow valve 15, is provided with P1 chamber, P chamber, P2 chamber, LS chamber in the valve pocket at pressure compensation spool place; P2 chamber is communicated with respectively low pressure relief valve 16, speed governing spool 17, throttling screw plug 18, and speed governing spool connects the 3rd spring 19, and the valve pocket at speed governing spool place is communicated with P3 chamber; In two-way guiding valve valve body 6, be also provided with and turn to valve rod 20, turn in the valve pocket at valve rod place and be provided with T chamber, C2 chamber, P3 chamber, D2 chamber, A2 chamber, B2 chamber.The two ends of ceding of Taiwan valve rod are respectively equipped with protecgulum 31, bonnet 32, and protecgulum place is provided with supporting screw 33.The outer end of two-way guiding valve plunger 7, pressure compensation spool 9 is provided with screw plug 34.
As Fig. 8, winder single channel guiding valve includes winder valve body 21, in winder valve body, be arranged with winder plunger 22, winder valve rod 23 in parallel, winder plunger is connected with the second hydraulic lock spool 24, the outer end that the second hydraulic lock spool is provided with the second hydraulic lock valve gap 25, the second hydraulic lock spools is outward connected with the second lock stifled 26; In the valve pocket at winder valve rod place, be provided with T chamber, B3 chamber, P3 chamber, A3 chamber, C2 chamber, C3 chamber, winder valve rod is connected with the 4th spring 27.The two ends of winder valve rod are respectively equipped with protecgulum 31, bonnet 32.
As Fig. 9, unloading single channel guiding valve includes unloading valve body 28, is provided with unloading valve rod 29 in unloading valve body, is provided with T chamber, B4 chamber, P3 chamber, A4 chamber, C3 chamber, C4 chamber in the valve pocket at unloading valve rod place, and unloading valve rod is connected with the 5th spring 30.The two ends of unloading valve rod are respectively equipped with protecgulum 31, bonnet 32.
The foregoing is only specific embodiment of the utility model, but structure characteristic of the present utility model is not limited to this, any those skilled in the art is in field of the present utility model, and the variation of doing or modification are all encompassed among the scope of the claims of the present utility model.
Claims (8)
1. a Combined harvester hydraulic control system, formed by two-way guiding valve, winder single channel guiding valve, three valves of unloading single channel guiding valve, it is characterized in that described two-way guiding valve is connected with ceding of Taiwan cylinder (1), left steering cylinder (2), right steering cylinder (3) by pipeline, winder single channel guiding valve is connected with winder cylinder (4) by pipeline, unloading single channel guiding valve is connected with unloading cylinder (5) by pipeline, and the return opening of two-way guiding valve, winder single channel guiding valve, unloading single channel guiding valve is by being connected in parallel.
2. a kind of Combined harvester hydraulic control system according to claim 1, it is characterized in that described two-way guiding valve includes two-way guiding valve valve body (6), in two-way guiding valve valve body, be arranged with two-way guiding valve plunger (7), ceding of Taiwan valve rod (8), pressure compensation spool (9) in parallel, two-way guiding valve plunger is connected with the first hydraulic lock spool (10), the first hydraulic lock spool is provided with the first hydraulic lock valve gap (11) outward, and the outer end of the first hydraulic lock spool is connected with the first lock stifled (12); Ceding of Taiwan valve rod is connected with the first spring (13), is provided with A1 chamber, B1 chamber, T chamber, LS chamber in the valve pocket at ceding of Taiwan valve rod place; Pressure compensation spool is connected with the second spring (14), and the outer end of pressure compensation spool is provided with high-pressure overflow valve (15), is provided with P1 chamber, P chamber, P2 chamber, LS chamber in the valve pocket at pressure compensation spool place; P2 chamber is communicated with respectively low pressure relief valve (16), speed governing spool (17), throttling screw plug (18), and speed governing spool connects the 3rd spring (19), and the valve pocket at speed governing spool place is communicated with P3 chamber; In two-way guiding valve valve body (6), be also provided with and turn to valve rod (20), turn in the valve pocket at valve rod place and be provided with T chamber, C2 chamber, P3 chamber, D2 chamber, A2 chamber, B2 chamber.
3. a kind of Combined harvester hydraulic control system according to claim 1, it is characterized in that described winder single channel guiding valve includes winder valve body (21), in winder valve body, be arranged with winder plunger (22), winder valve rod (23) in parallel, winder plunger is connected with the second hydraulic lock spool (24), the second hydraulic lock spool is provided with the second hydraulic lock valve gap (25) outward, and the outer end of the second hydraulic lock spool is connected with the second lock stifled (26); In the valve pocket at winder valve rod place, be provided with T chamber, B3 chamber, P3 chamber, A3 chamber, C2 chamber, C3 chamber, winder valve rod is connected with the 4th spring (27).
4. a kind of Combined harvester hydraulic control system according to claim 1, it is characterized in that described unloading single channel guiding valve includes unloading valve body (28), in unloading valve body, be provided with unloading valve rod (29), in the valve pocket at unloading valve rod place, be provided with T chamber, B4 chamber, P3 chamber, A4 chamber, C3 chamber, C4 chamber, unloading valve rod is connected with the 5th spring (30).
5. a kind of Combined harvester hydraulic control system according to claim 2, is characterized in that the two ends of described ceding of Taiwan valve rod (8) are respectively equipped with protecgulum (31), bonnet (32), and protecgulum place is provided with supporting screw (33).
6. a kind of Combined harvester hydraulic control system according to claim 2, is characterized in that described two-way guiding valve plunger (7), the outer end of pressure compensation spool (9) are provided with screw plug (34).
7. a kind of Combined harvester hydraulic control system according to claim 3, is characterized in that the two ends of described winder valve rod (23) are respectively equipped with protecgulum (31), bonnet (32).
8. a kind of Combined harvester hydraulic control system according to claim 4, is characterized in that the two ends of described unloading valve rod (29) are respectively equipped with protecgulum (31), bonnet (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320862187.7U CN203670329U (en) | 2013-12-25 | 2013-12-25 | Novel hydraulic control system of combine harvester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320862187.7U CN203670329U (en) | 2013-12-25 | 2013-12-25 | Novel hydraulic control system of combine harvester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203670329U true CN203670329U (en) | 2014-06-25 |
Family
ID=50966632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320862187.7U Withdrawn - After Issue CN203670329U (en) | 2013-12-25 | 2013-12-25 | Novel hydraulic control system of combine harvester |
Country Status (1)
| Country | Link |
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| CN (1) | CN203670329U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711740A (en) * | 2013-12-25 | 2014-04-09 | 新魁液压技术有限公司 | Novel hydraulic control system for combine harvester |
| CN108930679A (en) * | 2017-05-27 | 2018-12-04 | 江苏沃得农业机械有限公司 | A kind of synchronous valve turned to for controlling harvester with taiwan cut off and landing |
-
2013
- 2013-12-25 CN CN201320862187.7U patent/CN203670329U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711740A (en) * | 2013-12-25 | 2014-04-09 | 新魁液压技术有限公司 | Novel hydraulic control system for combine harvester |
| CN108930679A (en) * | 2017-05-27 | 2018-12-04 | 江苏沃得农业机械有限公司 | A kind of synchronous valve turned to for controlling harvester with taiwan cut off and landing |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140625 Effective date of abandoning: 20160210 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |