Compressing Mechanism Design Of Large Rectangular Baler And Experimental Study On Compression Research

There are abundant of bio-resource such as straws and forage grass in our country, but the industrialization was restricted by the collection and storage steps. In order to accelerate the industrial uses of straws and forage grass, design and development of large rectangular baler was regarded as one of the efficient methods to solve this problem. Review on compression theory and baler developing was carried out. Then the issue that lack of compression theory and the method of baler design out of time had been pointed out. As a result, design and dynamic simulation analysis on the compressing mechanism as a main mechanism for large rectangular baler was studied in this paper.According to the compression theory of foliage materials analyzed, design target that at least 7.8x 10₅N force supplied by the compressing mechanism was figured out. Referring to the experience of large rectangular baler design abroad, the design of compressing mechanism piston-crank was carried out. Under the condition was given that the displacement of crank was s=780mm, eccentric distance was e=85mm, and the angle between the two limited location of piston wasθ=3°, the suitable parameter for compressing mechanism crank-piston was calculated that the length of crank was r=388mm, the length of connecting rod was L=1190mm, the angularvelocity of crank wasω=180°/s. Refer to the configuration parameter and performance needs of compressing mechanism, the substantial model was built by the software Solidworks, the interference and mass character analysis was done by the tools adhere to the software Solidworks.Based on virtual prototype technology, dynamic simulation analysis on compressing mechanism crank-piston was made out under the condition of ADAMS. The graph of displacement, angular_velocity, acceleration, driving moments of piston, as well as the force on the joint between connecting rod and piston was educed. The stress of crank and connecting rod was calibrated after simulation. And that can be regarded a date as compressing design.Experimental study was carried on with ZHONGNONGJI 2100 LRB, which equipped with the compressing mechanism in this design. A conclusion was draught that when wheat straws (19.4% wet base water content) was compressed in setting condition. The relationship between compressing force and setting load was linear, and the correlative coefficient was 0.9804. The relation between compressing force, setting load and the bale density was exponential, the correlative coefficient was 0.9327, 0.9369 respectively. As to maize straws(10.7% wet base water content), the relationship between compressing force and setting load was linear, and the correlative coefficient was 0.9779. The relation between compressing force, setting load and the bale density was exponential, the correlative coefficient was 0.9768, 0.9245 respectively.