Feeding clearance control method and device of seamless welding machine

Abstract

The invention belongs to the field of molding or connecting of plastic, particularly belongs to the field of equipment for jointing prefabricated parts, and relates to a feeding clearance control method and device of a seamless welding machine for plastic-steel doors and windows. A plastic steel profile has the advantages of good sound insulation, heat insulation, corrosion prevention, impact resistance and the like, and is mainly used as push-pull and casement windows and doors, a guardrail, a tubular product and a ceiling material. The plastic-steel doors and windows adopt a hot plate welding method at present; the existing device adopts an open-cycle scheme, is overlarge in welding redundancy, and large in welding beading, and an obvious welding line exists after a corner is cleaned. According to the feeding clearance control method and device of the seamless welding machine, the displacement of a rear seat and the thrust of a cylinder are detected through an approach switch and a force sensor and fed back to a PLC (programmable logic controller) to form a closed loop; the stroke and the thrust of the cylinder are controlled; locating clearance control, molten clearance control and butt thrust control can be accurately achieved; the welding beading can be effectively reduced; and the feeding clearance control device is beautiful in surface, and high in welding line strength, can save the material, and can be applied to welding connection of color plastic steel profiles.

Description

technical field [0001] The present invention belongs to the field of molding or joining of plastics, especially the field of equipment used for joining prefabricated parts, and relates to a method and device for controlling the feed gap of a seamless welding machine for plastic-steel doors and windows. Background technique [0002] The main component of plastic-steel profiles is polyvinyl chloride (UPVC) resin, which has good sound insulation, heat insulation, corrosion resistance, impact resistance, etc., and is mainly used as push-pull, casement doors and windows, guardrails, pipes and ceiling materials. The production process of plastic steel door and window frame is: cutting→drilling and milling hole groove→installing lining steel→welding→cleaning welding angle→assembling hardware→installing, welding is the key process. At present, plastic steel doors and windows adopt the hot plate welding method: through heating and pressure, two or more surfaces of thermoplastic plast...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN2477314Y discloses a splicing and assembling method for plastic doors and windows, which uses glue-coated corner plug-ins to connect door and window components, which requires less investment, but has poor efficiency and quality stability, and is not suitable for mass production.

[0004] Because the existing welding equipment does not control the gap and thrust between the welded parts during the melting and butt cooling stage, in order to ensure the welding strength, it is often designed with too much redundancy, resulting in too large welding bead, and an obvious weld seam is formed after corner cleaning

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