1.Drive route, continuously variable transmission
In order to make the cutter head and the six feeding rollers run normally, the machine has carefully designed the transmission path and the V-belt continuously variable transmission. According to the threshing productivity requirements, the cutter head has a variety of speeds, but the transmission path is relatively simple. It consists of a two-stage transmission path. The first stage consists of a stepless variable speed pulley. The stepless variable speed pulley is directly installed on the motor shaft. A synchronous toothed belt is mounted on the other shaft. The wheel drives the timing belt pulley on the cutter wheel through a toothed belt, and the screw nut is fixed on the timing pulley. The rotation of the bolt pulley can move axially, so that the gap between the pulley becomes larger or smaller. Adjustable, the transmission ratio is about 1: 1.5.
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2.Variable speed belt is equipped with V-belt pulley
The first and second stage transmissions are all triangular belt wheels, the third stage is worm transmission, and the worm belt
The three sets of worm wheels are turned to the opposite direction. The worm wheels are connected to the conveying rollers. When working, the worm drives the worm wheels to rotate. The two sets of conveying rollers are both holding and conveying (corn cob). There are five-stage transmission in the entire transmission route. Due to the compact structure of the whole machine, a relatively novel V-belt stepless transmission is used in the design. Worm gears and worm gears have been designed and calculated several times. And the strength of the worm gear, the worm gear uses a negative displacement coefficient.
3.Unique cutter and cutter head
The cutter is a key part of the whole threshing machine. Its shape and material selection are very important. The cutter is welded by an L-shaped blade holder and a sword-shaped blade. From the perspective of the strength of the tool, the blade should be made of 65Mn material and heat treated after processing to make its surface hardness reach HRC50-60. However, because the blade is cutting corn kernels, the 65Mn material is easy to rust and the sanitary quality can not meet the requirements. Therefore, stainless steel is still used. Although the blade hardness is not ideal, there should be no problem in cutting corn kernels. To enable the cutter to cut corn kernels of different diameters, the cutter has a sliding distance on the cutter head during work.
In addition to installing cutters on the cutter head, it is also necessary to rotate on a fixed shaft sleeve to drive the cutter to rotate and cut. In order to make the cutter head structure compact, the cutter head is provided with a synchronous toothed belt wheel, the synchronous toothed belt wheel is provided with a plastic bearing, and the belt wheel and the plastic bearing are connected by screws. During work, a bearing made of polyvinyl fluoride (or nylon) is rotated on the shaft sleeve, and a needle valve oil cup is used to drip edible vegetable oil for lubrication.
4. Conveying and feeding device
In order to ensure the normal feeding and transportation of corn cobs, the machine has a unique working mechanism. The feeding device is composed of a worm, three sets of worm wheels turning in opposite directions, a roller support, a shaft, a special-shaped rubber roller, and a plastic toothed roller. The machine is started, and the rubber rollers and plastic rollers with thick ends and tapering in the middle are rotated. At this time, the corn cob is fed in. The rubber rollers hold them forward to the cutter and cut. To the waste bin. In order to adapt to the feeding and conveying of corn cobs of different diameters, a tension spring is installed on the drum. The spring can make the drum move at an appropriate angle. When the corn cob is fed, the mechanism can Automatically adjusted within a certain range according to the size of the cob.
5. Machine structure and material selection
The design strives to be simple, compact and beautiful in appearance. The overall dimensions of the machine are 610X620X1120mm, and the feeding height and safety are also fully considered. During work, the operating part of the machine is completely covered by the cover, and the feeding inlet is strictly controlled in size. Adults' hands cannot enter, ensuring safety when feeding corn. Most of the materials of the machine tool are stainless steel. In order to reduce the weight of the machine tool and reduce the production cost, the frame part is welded by folding the stainless steel plate. Although the diameter of the two transmission shafts is small, there is no keyway on the shaft, only the platform is processed, and the pulley is fixed with the set bolts, and the strength of the shaft can be guaranteed.
