Research Of Greenhouse-type Electric Tobacco Shearer

The tobacco industry is an important industry in our country, its cultivation area and totalproduction is highest in the world. Leaf-cutting is the key technology of the nurturingseedlings, which can adjust the growth of seedling root system and the on ground stems andleaves, as well as enhancing the resilience. Current research on tobacco leaf-cuttingmachinery in China is still in its infancy stage: with low levels of mechanization andautomation, intensive of labor, low leaf-cutting efficiency. In view of this present situation,referencing the research of both at home and abroad, on the base of finding existence certainflaw in the current cutting-leaf machine, a new type of leaf-cutting machine was designedwith the design requirements of seedlings characteristics，leaf-cutting principle and electricoperating in greenhouse，called greenhouse electric tobacco leaf-cutting machine. The newtype of leaf-cutting machine has the function of automatic leaf-cutting，blade disinfectionand broken leaf collection.The electrically operated tobacco leaf-cutting machine mainly to complete themovement，including straight movement of the machine and the movement of glide rackfrom left to right alternatively. The control system mainly controlled orderly alternation of thetwo movements to ensure the normal operation of the operating unit. Main research contentsare as follows:(1) Determining general structure of the machine. Greenhouse type electric tobacco leaf-cutting machine is mainly comprised by power systems, transmission systems, mobilesystems, control systems, disinfection equipment, collecting devices and racks etc, which is ascheme that not only meeting the design requirement but the application in production.(2) Designing of the mechanical parts. Making theoretical analysis and calculation to thecomponents，such as the main frame, slide rack, the leaf-cutting device, height adjustmentdevice, running gear, the disinfection device and collecting device. With the application ofCATIA to simulate analysis the force acting on shaft，and checking the interference betweenassembled parts. The glide rack transmission system uses gear drive, for which thetransmission ratio is stability, and the transmission efficiency is high.(3) Developing the control system. The main function of the control system is controllingthe main frame，s forward motion and the glide rack，s right to left motion，which can makesure the cutting process in order. Control part using STC89C52RC-type single-chip control layout of the hardware in accordance with circuit connection diagram for wiring, mechanicalparts droved by motor. Stopped or running of the sliding racks and machine stop or proceedcontrolled through a relay contact. Contact closing on the limit switch open/close status bymonolithic judgment. So the reciprocation does the automated homework.Prototype testing indicates that greenhouse electric tobacco leaf-cutting machine caneffectively complete the automatic leaf-cutting motion, and the leaf-cutting rate is93.9%, theleaf-cutting rate is95.2%when continuous operation， which meet the applicationrequirements. That is the machine conforms the design requirement.