Helm spoon combo Dibble the study design

        Mechanical precision seeding technology is a high technology content, save costs and increase the efficiency of appropriate technology, is an important part of conservation tillage. Dibble is the main technology for precision seeding, which is a key component to implement Dibble Dibble technology, Dibble machinery has gradually become an important part sowing machine. Dibble mainly by seeding and Dibble is two core components, the main function of Seedmeter are side by side according to sowing seed to Dibble needs even take control of them; Dibble's main function is to seed implants to a hole in the soil in.
        Shandong University of Technology research group has designed a rod-type steering wheel is turned Dibble, a lever-opening helm Dibble Dibble, etc. series devices.
        Dibble developed applications on the use of sowing machinery are upper row seed, a seed on their own gravity along the seed tube which is routed to Dibble. However, since the upper row seed spacing with the Dibble greater distance, seed delivery time is too long and by the seed tube friction, vibration, etc., leading to inaccurate Dibble Seeding is the emergence of a secondary cavity, replay and other phenomena . There is the upper row Seeding accuracy is not high, leading to the eventual seeding inaccurate. To solve the above problems to improve the quality of planting, first, to improve the discharge Seeding precision; secondly, to shorten the distance Planting. Therefore, this study was designed helm spoon combo Dibble device.
        1 and the basic structure and principles of Dibble's
        1.1 The basic structure of the wheel spoon combo Dibble is shape like the wheel, similar to the tiller of buried cavitation uniformly distributed in the wheel rim. The main components of the built-in spoon seed metering, a guide species wheel, brake disc, fixed disk, buried into the hole of the movable flap, flap setting and resetting spring. The key part buried into the hole and fixed movable flap valve using the lever principle, buried into the hole to complete the closing cast in the role of species cam stopper.
        Dibble is fixed to the rack axle, brake disc by bearings positioned on the axle can be rotated around the axle; buried into the hole uniformly distributed in the edge of the movable plate, radial, fixed valve welded on the wheel, moving the flap with fine long bolt hinged on the movable plate, fixed flap partially embedded in the role of the return spring tension and fixed engaging flap to prevent plugging soil buried into the hole, the move by the cam lobe stopper blocking force around the stud shaft must angle, according to the principle of leverage open; fixing keyed on the axle, the sleeve positioning, not random group advancing to rotate; fixed cam stopper for easy removal in the fixing bolt; return spring bolted moving flap The top and movable platen hole, slightly stretched state to ensure that the non-buried into the hole remains closed under the state open; Seedmeter spoon round by the partition, guide wheels and between species composition, with spoon round Species guide wheel is bolted to the brake disc, ensure synchronous rotation with the movable plate, can accurately put seeds into each hole is buried into them, the separator sandwiched spoon guide wheel and intermediate seed round, and together with the movable plate buttons, sync separator does not follow the disk rotates, the top with an opening to facilitate investment and species.
        1.2 Principle
        When the planter is not working, the host species tank seeds were transported to the seed tube lower seed box to ensure that their time is full of seeds. When the unit of work, is buried one by one into the soil, soil buried the reaction force of the steering wheel and rack form traction torque, driving the wheel is rotated, the movable plate rolling on the ground, while driving scoop wheel and guide wheels rotate synchronously species. When the scoop wheel rotates, each species will scoop spoon from the seed tank on the number of seeds, with the spoon while rotating wheel, Shaonei seeds in seed box Seed friction and its own gravity, to a certain angle, excess seed fell by its own gravity fall, seeding spoon only top seed was taken to the disk, the partition opening fall from seed round guide grooves, each guide groove corresponding to a kind of wheel to be buried Point is, when the guide groove to cast seed round seed zone, seeds buried rely on centrifugal force and gravity fall into the hole, thereby making accurate seed into the hole is buried into them.
        Buried into the hole in the state shut down non-seeding, the seeds will not leak out in advance. When the unit forward, buried into the hole on the device Dibble into the soil one by one under the influence of gravity, into the hole when a buried buried deepest reaches position after (perpendicular to the ground), buried into the top hole is movable flap in contact with the cam stopper , moving flap opens in the role of stopper and gradually increasing the angle, when the opening angle is greater than the seed size, seed fall into the soil under the influence of gravity.
        To prevent the clip earth, moving along the cam lobe open state contour remain unchanged until the scheduled departure soil flap certain height, moving the valve return spring tension effect closure to complete a planting. Thus, the role of the wheel under traction, cavitation is buried into the soil to complete the second and so on successively sowing.
        2 main component structure design parameters
        2.1 brake disc radius and buried into the hole is the number
        Movable disc radius from the hole distance L, sowing depth h1, buried into the hole is the number of z comprehensive OK. Fixed set outside flap wheel height is h0, actual rolling radius is Rs, then there is Rs = R + h0-kh1.
        2.2 cam stopper
        Press into the hole open requirements, the stopper is designed to lift the line, holding the line, drop line structure in the form of three segments. When the installation ends point to the distance between the movable flap top axle distance from the center of the axle center to the same, and to ensure that buried into the deepest hole is buried at the start of opening. For the stopper easy processing, buried into the hole closed when the oscillation is small, take α1 = α3, and the smaller the α1, buried into the hole to open sooner, to achieve more accurate sowing depth. To ensure that does not block the soil when buried into the hole open, not closed folder soil should be excavated before it starts to close.
        2.3 buried into the hole assembly
        Fixed and movable valve plate design one of its diameter d dependent on the size of the seed particles, generally take d> 43dz (mm), this design take d = 24mm; its outer diameter dw = P. The outer diameter of the movable valve dw 'and given valve diameter d with a fitting clearance, taking dw = 24-0.5-0.2mm; movable flap inner diameter d1 as: d1 = d-2Δr-λ3 where Δr --- movable flap wall thickness, mm; λ3 --- move between fixed valve assembly clearance, mm. Movable flap height H: H = h0 + h0 '= h0 + R-RN where h0' --- movable flap height in roulette. In the case of meet and roulette seed cavity of non-interference, h0 desirable maximum R-RN, in order to get a larger arm, making it easier to open. The analysis takes d1 = 20mm, H = 130mm, buried into the hole tilting angle β = 35 °.
        2.4 Seeding structure parameter design
        In this paper, a spoon seed metering and guide wheels as seed is buried into the hole for the kind of precise, spoon Seeder improve the take accuracies, accurate guide for the kind of seed round. Design, number teaspoon spoon wheel, several rounds groove lead seed round hole and buried into the number equal to 10, and the cam groove and buried into the movable flap pockets correspondence, to ensure accurate seed falls Among the cavitation device. To satisfy taken and Dropping requirements, will spoon handle tilt 10 °, round spoon spoon spoon finger species oblique circular groove. Round slot guides species wheel is also designed to tilt 10 °, for easy storage when the seed to seed district administration successfully put the seeds into the hole is among the buried. Species guide wheel radius depends cam stopper contour radius and depth to the height of the movable flap movable plate, in order to prevent friction will lead seed round radius is designed to 124mm, to ensure the lead seed round, spoon wheel and brake disc synchronous rotation, not interfere.
        3 Conclusion
        Using spoon round Seedmeter improved precision seeder combination spoon wheel and Dibble shorten the distance for the species, reducing the supply by the host Seedmeter kind caused uncertainty, additional built-lead seed round for further achieve a precise species. By seeding test rig experiments, the combination has a good seeding effect.