A control method for elevator car wall width error and assembly error

Abstract

The invention discloses a measuring structure and a measuring and controlling method for width errors and splicing errors of an elevator car wall. The measuring structure mainly comprises a car wall raw material, a lower bending die, an upper bending die and the like, wherein the length of the car wall is 2-3 m, and the car wall is composed of two independent raw material pushing pre-pressure andwidth detection sensor parts and a bending positioning leaning grid moving system; the car wall raw material is driven by a flat belt to provide linear moving power, the linear movement of the singleindependent raw material pushing pre-pressure and width detection sensor part and the bending positioning leaning grid moving system is provided by a sliding block servo mechanism, and the vertical movement is provided by a guide air cylinder and controlled by a PLC. According to the measuring structure and the measuring and controlling method, the width of the elevator car wall and the width of alift car after the car wall is assembled can be automatically measured, automatically compensated, fed back, recorded and displayed; and the measuring method reduces the original manufacturing errorof the single car wall from + / -0.5 mm to + / -0.E (such as + / -0.15), and for four pieces, the splicing error of the car wall from + / -2 mm is reduced to + / -0.E (such as + / -0.15).

Description

technical field [0001] The invention relates to the field of bending processing of elevator car walls, in particular to a method for controlling width errors and assembly errors of elevator car walls. Background technique [0002] At present, the structure of the elevator car wall is to fold 2 knives on both sides of the car wall width, and the bending angle on both sides of the car wall width is 89~90°. The nominal size and tolerance zone of the product are controlled, the bending width size and error are recorded in the X-bar control chart, and the process capability CPK is calculated. The assembly clearance of the car wall on one side of the car is calculated according to the assembly dimension chain formula. If N pieces of car walls are assembled, the manufacturing tolerance of a single car wall is ±0.E, and the cumulative clearance of N pieces of car walls after bending is ±N*0.E. For example, the nominal width of the current car wall is mostly between 300 and 800mm, ...

AI Technical Summary

Problems solved by technology

Raw material straightness error, raw material width error, bending reference inconsistency error, bending positioning grid contact error, material hardness and thickness influence error, bending machine blade straightness error, bending equipment winding compensation error, measurement method error etc. all affect the bending error of the width of the car wall. At present, the CNC sheet metal bending equipment imported by domestic elevator manufacturers is mainly imported from Europe, America (Italy, Germany, Finland, Switzerland, Belgium, the Netherlands) and Japan. The CNC bending equipment, bending molds, bending equipment precision and equipment winding compensation control of Nigeria, LVD, TRUMPF, AMADA, Bystronic and other companies are all higher than domestic equipment, and the bending error of domestic bending machines will be larger

However, the cumulative errors such as raw material width error, straightness error, and bending positioning error have a greater impact, resulting in most of the bending errors of the car wall width only reaching ±0.5mm

If the punching and bending positioning process gap is used and the rear grid bending positioning tool is added, the bending width error of the car wall can only reach ±0.3mm, and the assembly error of 4 car walls is ±1.2mm

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