Design And Experimental Of The Comb-type Picking Device In Cotton Harvester

China is one of the world's four major cotton-producing countries, cotton is the most important cash crop, a variety of industrial products is an important source of raw materials, plays an important role in the national economy, however, in the major cotton producing countries, China's cotton production mechanization minimum, especially in the South zone cotton, cotton machine income level which is almost zero. Southern cotton area undulating terrain, mainly in small plots, the distribution of concentration, which rely mainly on traditional cotton harvesting done manually, labor-intensive, low efficiency harvest, severely restricted the large scale cultivation of cotton. At present, China's cotton picker mainly rely on imports from abroad, Shihezi your Air Equipment Co., Ltd. of 4MZ series horizontal spindle type cotton picker picking machine can meet the requirements of Xinjiang cotton harvest areas, but its key components are still dependent on imports. Its large size, high cost, power consumption and more, can not meet the individual farmers in cotton picker cotton dominated southern district requirements, so for the southern cotton design small size, simple structure, low cost of harvesting cotton picker has important significance.Based on Southern cotton plots size, soil conditions and agronomic requirements designed a small comb-type cotton picker cotton picker head, harvest index evaluation picker head net effect is that the rate of harvest, the harvest of seed cotton hetero hit the floor rate and loss rate of cotton. To make the design work of cotton picker head has a higher net rate of harvest, low impurity rate and hit rate when landing cotton losses, mainly from the following aspects carried out the research:1. Physical properties of cotton. Obtained by studying the "JX-013" cotton species,to cotton height of about 110cm, single trees, cotton boll average number of 29.7, boll boll diameter distribution in the 41-59mm, the highest and lowest growth area bolls were growing 102-114cm and 24-33cm, seed cotton boll shell and separating force 1.3-3.4N, to provide data for the structure and size of the program and pick key parts is determined;2. The design of the cotton picker cotton picker head means, means and removal comb cotton means. Determine the size of the basic pitch of the spatial structure of cotton picker apparatus, means and basic dimensions comb comb between the use of Solidworks software chainring, comb and racks finite element analysis and structural optimization, key parts identified materials and dimensions to prevent tooth piece, comb, chassis and other parts affected by deformation picking effect;3. The process of the cotton picker cotton off key and dynamic analysis process, through the chain drive motion analysis, kinematics analysis sheet picking teeth, tooth plates analysis of seed cotton picking ability, mechanical seed cotton under all conditions analysis, from the cotton process dynamics analysis, mechanical analysis comb combing process concluded: affect the degree of uneven chain drive on the net rate of harvest can be ignored; cotton picker head forward speed constant, and boll impurities chainring the number of contacts increased with increased chain speed and thus less inner seed cotton bolls left to obtain a higher net rate of mining and trash content; in a certain pitch range, the greater the pitch, picking effect the better, the higher the rate of net mining; cotton off the disk rotation speed is much larger than the chain speed, the higher the speed, the lower the impurity rate; chainring faster, the greater the deformation reaction force cotton sticks, tooth plates for fiber the striking force, the higher the cotton colliding loss rate;4. The main factors affecting the performance of the cotton picker head (with the chain teeth are arranged in the form of tooth piece of tooth chip length, the toothed chain rotation speed and the forward speed of the cotton picker head) were univariate and multivariate experimental study to determine the best combination of cotton picker head main structural parameters and operating parameters, elected by arrangement B, a length of 22mm chainring When the chain speed is 100r/min, the forward speed of 0.3m/s, the net rate of 89.74% mining, seed cotton trash content was 10.32%, cotton colliding loss was 6.24%.