The master of the automatic door determines the strategic decision-making stage of key design factors such as technical and economic indicators. The basic questions that should be considered in the overall design are: (1) Technical skills. Manufacturing productivity, manufacturing accuracy, strength and stiffness, reliability, service life, operational performance, safety and environmental factors. (2) Economic performance. Efficiency, economics, cost, manufacturing repair, form factor and weight. (3) Aesthetic performance. Coordination of style, color and surroundings. The basic content of the automatic door design and the basic principles of design must meet the requirements of general machinery. Because the automatic door is a general mechanical device and is a machine with special requirements, the basic content and principles of the automatic door design must meet the requirements of mechanical design. Mechanical parts design points (1) Ensure that mechanical parts have normal functions and avoid failure of mechanical parts. Failure means that the mechanical component has lost its state of function. The effectiveness of mechanical parts is related to the material of the manufactured parts, the working environment of the parts, and the state of the working stress. In order to ensure the expected function of the part, the designed part needs to meet the basic design requirements in terms of strength, stiffness, stability, friction and temperature. 1) Strength. Parts that break or do not allow residual deformation during operation are insufficient in strength. The effectiveness caused by insufficient strength is divided into overall failure and surface failure. The former refers to the breaking of the root of the gear; the latter refers to the plastic deformation of the tooth surface of the gear. In order to improve the strength of the parts, high-strength materials should be used to increase the cross-sectional dimensions of the parts, and heat treatment and chemical treatment methods should be used to improve the mechanical properties of the materials. Most of the mechanical parts work under variable stress conditions, and thus the main factors causing the failure of the parts due to fatigue failure. When designing parts, pay attention to factors that affect fatigue damage, such as stress concentration, surface quality of parts, and environmental conditions. 2) Stiffness. The elastic or plastic deformation of the part during operation should not exceed the allowable limit. When the deformation is too large, it will affect the working performance of the automatic door (such as the two-wing revolving door, four axles, guide rails, etc.) that bear the main load. Therefore, in addition to the strength calculation, the stiffness calculation is also required. The stiffness of the part is divided into two types: overall deformation stiffness and surface contact stiffness. The former refers to the degree of elastic deformation such as elongation, shortening, and torsion of the part under load; the latter refers to the microscopic peak on the contact surface of the part. The way to increase the stiffness is to increase the section size or increase the moment of inertia of the section, and increase the support area to increase the contact stiffness. 3) Surface damage. The surface damage of the parts is mainly corrosion, wear and contact fatigue. The form of failure that occurs as the surface ruptures over time. For parts subject to such damage, corrosion-resistant materials or various anti-corrosion surface protections such as bluing, surface coating, spray paint film and surface anodizing should be used to improve the corrosion resistance of the parts. 4) Destruction of the effectiveness caused by normal working conditions. Parts can only work normally under certain external environmental conditions, otherwise it will cause failure. For example, gears and bearings must work under lubrication conditions; both high and low temperatures can significantly reduce the load carrying capacity of the part. (2) Other requirements for the design of mechanical parts. 1) Structural process requirements. Good structural processability means that the parts can be produced conveniently and economically under certain production conditions, and are easy to assemble into machinery or equipment. Therefore, the structural processability of the parts should be considered comprehensively from the whole process of blank manufacturing, machining process and assembly. At the same time, current production levels and conditions should be considered. This work is a large part of the design and must be given enough attention. 2) Economic requirements. In the design of parts, in order to save production costs, the structure of the parts should be simplified as much as possible to reduce the processing cost; cheap and sufficient materials should be used; standard parts should be used to replace specially processed parts as much as possible; Assembly costs, so good processability is economical. 3) Reliability requirements. Reliability refers to the probability that a part will perform its function normally within a specified period of use (life) and under predetermined environmental conditions. Because the failure of the parts is random. Therefore, in order to improve the reliability of the parts, it is necessary to make the random variation of the working conditions and the performance of the parts as small as possible, and to strengthen the maintenance and inspection in use to improve the reliability of the parts. 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