Straw Balers D-knotting Structure And Parameter Optimization

Straw is important biomass energy, the number of exploitable biomass energy is considerable. Nowadays a lot of straw resources directly burned, and pollutes the environment which forms fog and haze affecting people’s life quality. So, The application of modern design theory based on this D-knotting structure has been improved and structural optimization design, provide the basis for further address knotting domestic manufacturing.The pick-up straw baler is widely used to collect and bundle the rice and wheat straw, banding is a main process of comprehensive utilization of straw. The key to solve crop straw collection is automatic packer technology, the core institution is knotter, which is an important device to measure the performance of the baler. Its structure is more complex, manufacturing is difficult and it is also expensive. Currently, almost all of the knotters are purchased from abroad, which limits the development of China’s machinery. Therefore, designing a cheap and durable knotter is imperative.Through analyzing the D-knotter principle at first, manufacturing domestically knotter as the goal, mapping the foreign D-knotter as a means, and on the basis of fully understanding the research status at home and abroad, this paper analyzes comprehensively the advantages of various knotters, carries out optimization design on the structure of the D-knotter using the theory of modern design method, and put forward the important theory basis to further resolve knotter localization of manufacturing. The main conclusions were as follows:(1) It makes three-dimensional modeling and virtual assembly on9YFQ-1.9square baler Ward produced using the engineering methods, analyzes of key components D-knotter and its subsidiary bodies knotted rope to send dryer, bureaus, agencies rope dial, movement bale length control mechanism and piston mechanism of joint work using virtual prototyping technology, obtains the movement characteristics of devices and the interaction order, and reveals the knotting principle of the D-knotter.(2) Knotting analysis test bench was designed, test analysis on complete bundle of knotted rope knot sequence was made, the freedom of the main institutions of knotter was calculated. Building test systems based on high-speed photography technology comes to the working phase motion cycle diagram of the actuator of knotting system. And it analyzes the effects of different types of twines on the knotting rate using universal testing machine.(3) It makes mechanism analysis on the key components of knotter, establishes a three-dimensional assembly model on the drive gear disk mountable using SolidWorks software, does structure optimization on the main parts such as drive gear disk and clip rope disc and so on, and solves the problems which are the drive gear tooth weared easily and processed difficult. It builds baler twine model using ADAMS/View software post-processing modules, combining the data exchange between the two softwares, and verifies the reliability of new disk drive gear knotted action. It also makes the new drive disk gear strength analysis and stress analysis with the application of ANSYS software, and guides the driver surface treatment and material selection on matrix chainring teeth and two straight, which provides a theoretical basis on realizing our country independent research and development of knotter.