| The powdered squid tentacles is an important squid product.Due to its special shape,soft texture and high requirements for coating effect,the existing coating equipments cannot meet the requirements,so powder coating of squid tentacles is mainly artificial.Based on the analysis of the squid tentacles powder coating process,a technical scheme of automatic powder coating for squid tentacles was developed.Aiming at several links of the squid tentacles powder coating process,the physical properties of tangyang powder and squid tentacles were analyzed,and the method of powder coating and the relevant coating mechanism were studied in the paper.In this paper,a method was proposed to use high voltage electrostatic technology for powder coating of squid tentacles,combine vacuum holding and crank rocker mechanism for squid tentacles sorting,use motor driven pining mechanism for inserting operation.The main research contents and results are as follows:1)Study on the physical properties of tangyang powder and squid tentacles.The properties of bulk density,tap density,angle of rest,particle size distribution and resistivity were measured.Test results showed that the apparent density is 0.46 g/ml,the average density is 0.82 g/ml,angle of repose is 57.30,tang yang powder particles smaller than 250 microns particles account for 93.27%of the total mass,tang yang powder resistivity is 362.1 G?·mm.The test data showed that tangyang powder has a poor fluidity and of medium charge.The experimental devices were designed to test the charactristics of squid tentacles transverse compression and longitudinal needle resistance.The experimental results showed that when the compression deformation is less than 1.5mm,the squid tentacles is in the stage of elastic deformation,and the average value of the corresponding compressive force is 11.2 N.Needle resistance characteristic test results showed that there is a linear relationship between resistance and pin trip,average value of fitting line slope is 0.3 N/mm,averages value of R2 is 0.991.2)Squid tentacle artificial coating and electrostatic coating test.In order to obtain the thickness and quality data of the power layer of the squid tentacle surface,the artificial coating experiment simulating the actual production conditions was carried out.The results showed that the effective consumption of each squid foot was 2.23 g and the theoretical thickness of coating layer was 0.61 mm.The experiments were made with self-designed electrostatic coating device,results showed that the coating speed and mass increase can be improved effectively with medium humidity and high voltage.Adhesion between the powder layer and squid tentacles under different coating conditions were tested,results showed that when humidity was over 80%,electrostatic have less effect on the powder coating adhesion,when humidity was under 60%,electrostatic has bigger influence on the powder coating adhesion.3)Study on squid tentacles sorting device.In order to take squid tentacles orderly from the container,the squid tentacles sorting device was designed with the combination of vacuum suction and crank rocker mechanism.The acceleration analysis and simulation of the squid tentacles suction point of the crankshaft rocker mechanism were carried out,and the simulation results showed that the acceleration peak of the suction point is 5.868 m/s2 when the crank speed is 60r/min.The test results of the vacuum degree in the pipeline under different working conditions showed that the vacuum degree of the system is 20?25kPa when the load is empty;when the squid tentacles is absorbed,the vacuum degree is 55?68kPa;when the squid tentacles falls,the vacuum drops to 25?45kPa.4)Study on squid tentacles insertion mechanism.In order to realize the separation of adjacent tentacles and reliable fixation in the operation of squid tentacles,a insertion mechanism was designed based on the experimental results of the compression characteristics of the squid and the characteristics of the insertion resistance.In the device,a screw and nut transmission device driven by a motor to realize the automatic movement of needle and longitudinal insertion of squid tentacles.The needle fix squid tentacles by the friction between the squid tentacles and the needle.The movement distance of needle is 35 mm.5)Study on the pneumatic conveying of tangyang powder.In order to transfer the tangyang powder from powder barrel to squid tentacles surface for powder coating,a pneumatic conveying system including air compressor,powder barrels,powder fluidized device,injection devive was designed.The convection mechanism was analyzed and calculated,and the minimum fluidization velocity of tangyang powder was 0.044m/s,and the pressure of fluidized plate was 0.26N/m2;The main parameters of the jet feeder is 1.8 mm in diameter,the nozzle diameter is 5mm,the diffusion angle of the diffusion tube was 2°,and the diffusion length was 80.4mm.The results of pneumatic conveying test showed that the cone top angle of the diffusion of air powder mixture was 47°,and the minimum distance of squid foot and nozzle was 122.4 mm.6)Study on the automatic and orderly placement of squid tentacles on a tray.In order to realize the automatic and orderly placement of powder coated squid tentacles on a tray,a three-dimensional automatic placement device was designed,the mechanism includes three sliding tables driven by stepping motor respectively,the tray is placed on the top of the mechanism.The way of laying of the squid tentacles on the tray was planed and a mathematical model of relative motion between squid foot and squid foot is established by theoretical analysis. |
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