The knapsack corn combine harvester can be used in other operations after the harvesting operation, and the features of cheap purchase cost have been gradually applied. However, the disadvantages of this model are also very obvious. The problem of inconvenient handling and low efficiency still needs to be improved.

Cause of the problem

The reason for the above problems is that the front wheels are heavily loaded. Since the corn picking table is suspended in front of the tractor, the weight load is almost entirely added to the front wheel of the tractor, resulting in a reduction in the walking and cornering performance of the tractor, and in terms of maneuverability and safety. Sex is greatly affected, which makes the working speed and operating efficiency of the knapsack corn combine harvester limited. According to the survey, the weight of the picking platform for the second row of corn combine harvesters is generally between 800-900kg, and the weight of the picking platform for the three-row corn combine harvester is approximately 1,100kg. If the method of transmission can be optimized and simplified, the structural weight can be effectively reduced. , Will greatly improve the problem of heavy load on the front wheel of the harvester. The second is the second lifter (which transports the harvested corn ear from the front of the tractor to the top rear grain bin). The weight is about 150kg. The required power is provided by the picking table transmission mechanism, and the front end is fixed on the hanging corn. The picking table is lifted up and down with the lifting of the picking table, which also increases the additional weight of the tractor's front suspension. In particular, this elevator is arranged on one side of the picking table, which makes the weight of the suspension in front of the tractor offset, thereby further affecting its handling performance. The third is that the existing corn harvester generally connects the support of the picking table with the hanging bracket of the tractor, or is directly fixed and connected. Manually adjusting the height of the picking table from the ground (about 60 cm or so) before the harvesting operation. Cannot (or inconveniently) control the lifting of the picking table at any time. As a result, the machine's line spacing is adaptive and has an adverse effect on tilted lodging corn, low corn harvesting ability, and harvest quality (high breakage rate).

improvement measures

In view of the above problems in the existing knapsack corn harvesters, after several years of experimental research, I gradually improved the technical solutions and approaches to solve the above problems, and have verified the actual field operations. Improved three-line backpack corn combine harvester with 50kW power, improved manoeuvrability, driving comfort and safety, light and flexible operation, and improved row spacing; its operating speed can reach 5.5km/h, pure The operating efficiency can reach 0.8hm 2 /h, and the actual operating efficiency of the suitable block is 8-9 hm 2 /h. Compared with similar models, the operating efficiency increased by about 1.5 times. The main measures are:

1. The corn picking table is hinged on the tractor support and a hydraulic cylinder is used to connect the corn picking table main beam and the tractor support. When the hydraulic cylinder is extended, the whole corn picking table can be rotated about the suspension axis, so that the picking table can be freely raised and lowered during operation. In addition, this connection method can also reduce the minimum ground clearance of the picking platform to about 20 cm, which greatly improves the line spacing adaptability of the machine and the harvesting ability of the inclined lodging corn. At the same time, the material and weight of the suspended joint part are also reduced; (Backhand corn harvester picking head suspension; Patent number: 200520124930.4)

2. The main power of a pair of ear extraction roller group is input with the drive chain, and the four rotating parts of the active picking roller, the passive picking roller, the internal shifting chain transmission mechanism, and the external shifting chain transmission mechanism also come from the transmission chain. connection. Therefore, the structural weight of the transmission part of the picking table is greatly reduced; this method can reduce the structural weight of the whole corn picking table by about 150 kg, greatly reducing the weight load of the front wheel of the tractor, and effectively improving the operating performance of the corn combine harvester. (Knapsack corn harvester picking table transmission device; Patent No.: 200520124931.9) 3. Separating the second elevator installation from the picking table and fixing it directly on the tractor support and powered by the tractor frame. . This method completely eliminates the additional load added by the second elevator to the picking table, effectively simplifies the transmission mechanism, and makes the operation of the picking table more flexible. (Piggyback corn harvester picking table suspension device; Patent No.: 200520124930.4) Although this improvement has achieved relatively satisfactory test results, there are many places that can be improved and improved. It is hoped that interested people will conduct more in-depth research, exchanges and explorations on the manufacturing technology of corn harvesters, so that the corn harvest mechanization technology will be more smoothly promoted.

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