Development Of Automatic Processing Equipment For Sealing Spherical Surface Of Cab Turnover Cylinder

Pressure-holding effect of cab turnover cylinder mainly depends on the processing quality of sealing spherical surface of turnover cylinder.In this paper,an automatic processing equipment for the sealing spherical surface of turnover cylinder is developed in order to solve the shortcomings caused by traditional method using in processing the sealing spherical surface of the cab turnover cylinder which adopted by most enterprises at present.The shortcomings include low degree of automation,low production efficiency,poor product quality consistency,low product qualification rate and high production cost.The workflow of equipment is determined in this paper according to the technical requirement of the equipment,which proposed by the factory,and the traditional processing process.Under the workflow of the equipment,the whole machine is divided into five sub-mechanisms: main frame,automatic feeding mechanism,sealing spherical surface automatic processing mechanism,sealing spherical surface quality automatic detection mechanism and automatic receiving mechanism.The design of each sub-mechanism is worked out firstly,then the structural design of each sub-mechanism is completed by using 3D drawing software CATIA based on the design.Finally,reasonable spatial layout is conducted after considering the position relationship of each sub-mechanism and structure design of the whole machine is completed.Static analysis and modal analysis to major pressure-bearing mechanisms of this equipment-main frame and extrusion steel ball mechanism in sealing spherical surface automatic processing mechanism are carried out by using finite element analysis software ANSYS Workbench.It ensures that the designed mechanism meets the requirements of strength and stiffness and does not resonate with external excitation,which provides a theoretical basis for the design of mechanical structures.The control mode of the equipment is determined as pneumatic control and electrical control after comprehensive consideration of the working characteristics and site conditions of the equipment.The principle diagram of pneumatic control system is designed firstly by applying the knowledge of pneumatic transmission and combining with the actual function of each pneumatic component.Then,the overall scheme of the electrical control system is formulated according to the functional requirements of the equipment,and main follow control manner with upper and lower computer is determined.The upper computer is HMI man-machine interface and the lower computer is PLC.What is more,the main circuit and peripheral auxiliary circuit are designed,the peripheral wiring diagram of PLC is drawn and the PLC control program is written.Finally,the design of visual interface is completed for realizing the requirement of visualization and intellectualization of equipment.The whole machine is assembled,debugged and produced on site.In addition,to evaluate the function of equipment,the performance evaluation experiments of the processed products are carried out according to the performance evaluation index of the products.The experimental results show that the surface roughness Ra value of the machined sealing sphere is not more than 0.4 μm,the maximum truncated circle diameter of the machined sealing sphere reaches 4/5 of the diameter of the steel ball,and the qualified rate of product sealability is raised from 82% to 99%.When 140 products are produced,the production efficiency is increased by 30%.Moreover,with the increase of production,the production efficiency is improved more and more obviously.All the indexes meet the requirements of enterprises and bring enormous economic benefits to enterprise.