Lower sliding device of sliding door

By installing a double-track slide and a double-row pulley assembly at the bottom of the sliding door, combined with the protective structure of the slide suspension channel steel and the pulley suspension channel steel, the problem of insufficient protection of the sliding door sliding device in the prior art is solved, achieving good sealing, windproof, sandproof and heat preservation effects, and ensuring smooth sliding.

CN224173911UActive Publication Date: 2026-04-28LIAONING ZHENGHAODA IND & TRADE CO LTD
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Patent Information

Application Number
CN202520314457.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-26
Publication Date
2026-04-28
Estimated Expiration
2035-02-26

AI Technical Summary

Technical Problem

The existing sliding door bottom sliding device lacks a protective structure, which leads to the entry of debris, rainwater getting wet, rusting of the track, icing, poor sealing, and poor heat insulation. It is especially difficult to use in bad weather.

Method used

It adopts a double-track slide and a double-row pulley assembly, combined with the protective structure of the slide suspension channel steel and the pulley suspension channel steel. The openings of the slide suspension channel steel and the pulley suspension channel steel are opposite and parallel to each other. The pulley support frame is fixed on the pulley suspension channel steel, and the slide suspension channel steel is fixed to the ground. The pulley suspension channel steel is connected to the sliding door to form a maze structure. The pulley support frame is an inverted T-shape, and the slide is an integral double track with anti-detachment guards.

Benefits of technology

It effectively prevents debris, rainwater, and sand from entering, improves the sealing effect, enhances the heat insulation performance, improves the stability and balance of the pulley, facilitates production and assembly, ensures smooth sliding, and avoids jamming and derailment.

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Abstract

The utility model discloses a sliding door lower sliding device which comprises a double-rail slide way and a double-row pulley assembly matched with the double-rail slide way, and the double-row pulley assembly comprises a pulley supporting frame and double rows of pulleys installed on the pulley supporting frame. The lower sliding device of the sliding door further comprises a sliding way hanging steel channel used for hanging the double-rail sliding way on the ground and a pulley hanging steel channel used for hanging the double-row pulleys at the bottom of the sliding door, and the opening directions of the sliding way hanging steel channel and the pulley hanging steel channel are opposite and are arranged in parallel in an inserted and buckled mode. An upper leg of the slideway suspension channel steel is located between an upper leg and a lower leg of the pulley suspension channel steel, the double-track slideway is fixed on the lower surface of the upper leg of the slideway suspension channel steel, and the pulley support frame is fixed on the upper surface of the lower leg of the pulley suspension channel steel. The lower sliding device of the sliding door is good in sealing effect, sundries are not prone to entering in the using process, and the lower sliding device has the advantages of being rain-proof, wind-proof, sand-proof and the like.
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