A welding method for a coal cutter spiral roller tooth holder

CN122353147APending Publication Date: 2026-07-10SHANGHAI TIANDI MINING EQUIP TECH CO LTD +1
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Patent Information

Application Number
CN202511428594.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-02
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

The welding process of the spiral drum tooth seat of the existing coal mining machine has problems such as cumbersome flame preheating operation, great safety hazards, low production efficiency and easy cracking of the tooth seat weld. Especially when encountering faults and coal gangue, the tooth seat is more prone to weld cracking and falling off when subjected to large impact loads.

Method used

After preheating in the furnace, an isolation layer is deposited on the surface of the weld bevel of the gear seat. Then, it is remelted by automatic TIG welding and MAG welding to optimize the geometry of the weld toe, increase the thickness of the tail weld to improve strength, and perform argon arc welding remelting to eliminate undercut defects and reduce stress concentration.

Benefits of technology

It effectively eliminates the safety hazards of flame preheating, improves the strength and fatigue life of the tooth base weld, reduces the risk of cracking, enhances the tensile strength and fatigue strength of the tooth base, and improves production safety and efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention belongs to the field of mechanical manufacturing, specifically relating to a welding method for a spiral drum tooth seat of a coal mining machine. The invention proposes to first deposit an isolation layer on the welding bevel surface of the tooth seat before spot welding it to the spiral blades. Before depositing the isolation layer, the entire tooth seat is preheated in a furnace to prevent cold cracking in the heat-affected zone (HAZ) and reduce its embrittlement. After the deposit is completed, the weld toe is repaired using argon arc welding, and then slowly cooled to room temperature. Argon arc welding is then used to optimize the geometry of the weld toe and reduce the stress concentration factor. After cooling to room temperature, the tooth seat is then spot welded to the spiral blades without further preheating. This method eliminates the need for on-site flame preheating during the welding of the tooth seat and spiral blades, completely eliminating the associated safety risks. The batch preheating of the tooth seats before spot welding ensures thorough preheating and high economic efficiency, effectively preventing cold cracking in the HAZ and reducing its embrittlement.
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