Research Of Reducing Cutting Energy Consumption And Simulation Analysis For Certain-length Branch Cutter

China is a big country in the production and consumption of wood materials in the world.Every year,about 109 million tons of the harvesting residues of shrubs and economic forests tend to be produced.These forest residues can be converted into nearly 100 million tons of standard coal.The branches of forset tending residues are the important biomass fuels,the processing and treatment of residual branches of forest tending plays an important role in the utilization and popularization of biomass energy.Therefore,it is very important to develop an equipment for the treatment of forest residual branches with high efi-iciency and low energy consumption.In this paper,the self-made branch cutting test bench is used for static cutting test.Based on the actual residual branch cutting form,the single factor test methods and multi factor test methods are used to study the cutting angle,wedge angle and sliding angle,which effect on the peak cutting force and cutting energy consumption of cutting single shrub branch.The single factor test shows that the peak cutting force and cutting energy consumption increases with the increase of the wedge angle;the sliding angle has a certain effect on reducing the peak cutting force and reducing the cutting energy consumption within certain range.When the sliding angle is between 5°-10°,it has a certain effect on reducing the peak cutting force and cutting energy conmsuption.When it is greater than 10°,the peak cutting force is gradually increased,and the caragana branches have a tendency to slip out during the cutting process;with the increasing of cutting angle,the peak cutting force an cutting energy consumption is significantly reduced,whose influence is remarkable.In the experiment,it was found that the excessive cuting angle would cause the cutting of caragana branches to be difficult,because the caragana branches would split along the fiber direction forming to chips.The variance analysis and significant influence analysis of the wedge angle,the sliding angle and the cutting angle were carried out by Design-Expert.The results show that the cutting angle has the most significant influence on the peak cutting force and cutting energy consumption,followed by the wedge angle,and the sliding angle is not much significant.Based on the results of single factor test and variance analysis,the combination of the cutting angle of 45o,the wedge angle of 30°,and the sliding angle of 5°-100 °an significantly reduce the peak cutting force and cutting energy consumption.The design of setting-length branch cutter is directed by the result of the static cut test,the branch cutter machine is driven by an electric motor.Under the actual working conditions,the setting length cutting machine was used to carry out to measure the working efficiency and working energy consumption.A 4kW elecrical motor was used as driving power for setting-length cutter.The working efficiency and working energy consumption were measured under the condition of manual feeding,the cutting frequency is 84 times per minute.The setting-length branch cutter ran for 10 mins each time,and tests were repeated 5 times then recorded the weight of branch chips and power energy consumed by the motor.The energy consumption and working efficiency of setting-length cutter can reach 68kg per hour and 3.2kW·h per hour.