Research On Fruit Tree Pruning Cutter Based On Bionic Micro-texture

Fruit tree pruning is an indispensable part of the fruit tree management process and plays an important role in promoting fruit tree growth and improving fruit quality.With the continuous promotion and application of electric pruning shears in orchard,the tool is prone to wear and chipping,which affects the working efficiency of workers,reduces the service life of electric pruning scissors,and causes the increase of the use cost,which seriously restricts the mechanization development of the orchard.Therefore,it is of great significance to study the electric resistance pruning shears with drag reduction and wear resistance.In this paper,the bionic micro-texture design based on the diastolic morphology of the head of Eisenia foetida was used to form the bionic micro-texture on the surface of the SK-5 tool;Friction and wear analysis of the surface of non-textured tools and textured tools using a friction and wear tester;The area of the main friction area of the tool was studied by a self-made intelligent shear test platform.The test results show that:(1)The self-made intelligent shear test platform can realize automatic feeding and automatic cutting during the branch cutting process,and can perform tool shear comparison test and tool fatigue test;(2)The power of the fiber laser is 75 W,the scanning speed is 4.8 mm/s,and the actual size of the groove micro-texture is obtained by the groove pitch D=1300μm,the groove width d=138.3μm,the groove depth s=33.5μm,which is basically consistent with the bionic micro-texture geometry;(3)The friction and wear test shows that:1)The optimum grinding and texturing parameters obtained in this test are 1.6 mm textured tools:the friction coefficient of the non-textured tool is reduced by 16.7%under500 g load,and the friction coefficient is the largest in all texture tools;The volume wear under the load of 400 g is reduced by 21.5%compared with the non-textured tool,which is the largest reduction ratio of volume wear in all texture tools.The friction coefficient under the load of 400 g is 4.7%lower than that of the non-textured tool.It is known from the wear scar morphology that the wear mechanism gradually changes from adhesive wear,micro-cutting wear to abrasive wear and oxidative wear;2)Under the same load,different tools have different friction and wear conditions:200 g load The 1.0 mm textured tool has the lowest average friction coefficient of 0.3006,compared with the non-textured tool,the wear reduction effect is 5.7%,and the volume wear is the smallest,which is 1053.65 mm~3.Under 300 g load,the average friction coefficient of 1.3 mm textured tool is smaller than other texture tools,which is 0.3061,but has no wear reduction effect compared with the non-textured tool,and the volume wear is the smallest,which is 728.67 mm~3;Under the load of 400 g,the 1.6 mm textured tool has the smallest average friction coefficient of0.2619,compared with the non-textured tool,the wear reduction effect is 4.7%,and the volume wear is the smallest,which is 616.70 mm~3.Under the load of 500 g,the average friction coefficient of 1.6 mm textured tool is the smallest,which is 0.2854,compared with the non-textured tool,the grinding effect is 16.7%,and the non-texturing tool has the smallest volume wear,which is 312.28 mm~3;3)When the texture is the same,the friction and wear under different loads are different:When the non-textured tool has a load of 300 g,the surface friction coefficient is the smallest,which is 0.2572;The load of 500 g is the smallest,and the volume wear is the smallest,which is 312.28 mm~3;The 1.0 mm textured tool has a minimum surface friction coefficient of 0.4985 at a load of 400 g,and its volume wear is the smallest at a load of 500 g,which is 427.32 mm~3;When the 1.3 mm textured tool has a load of 300 g,the surface friction coefficient and volume wear are the smallest,respectively is 0.3061 and 728.67 mm~3;When the 1.6 mm textured tool has a load of 400 g,its surface friction coefficient and volume wear are the smallest,respectively is 0.2619 and616.70 mm~3.(4)The branch shear test of 1.6 mm textured tool and non-textured tool was carried out by self-made intelligent shear test platform.The test results show that:When cutting the10 mm,15 mm,20 mm diameter longan branches,the number of shears required for the textured tool is higher than that of the non-textured tool when the same paint wear area is used;When the same number of shears is used,the first detected non-textured tool has a larger paint wear area than the textured tool,and as the diameter of the branches increases,the effect of the textured tool is significantly reduced.