Telescopic nozzle capable of spraying stable airflow for gas shielded welding and using method of telescopic nozzle

Abstract

The invention discloses a gas shielded welding telescopic nozzle capable of spraying stable airflow. The gas shielded welding telescopic nozzle comprises a nozzle seat, a telescopic sleeve and a gas screen, or further comprises a locking nut or a locking protective sleeve or a dustproof sleeve. An air screen is arranged at the inner upper part of the telescopic sleeve, and nozzle telescopic adjusting scales are arranged on the outer surface of the lower section of the upper part of the telescopic sleeve; self-sealing / instant self-locking telescopic threaded connection is formed between external threads on the upper portion of the telescopic sleeve and internal threads of the nozzle base so that the length of the nozzle can be adjusted. The locking nut or the locking protective sleeve is screwed on the lower section of the external thread at the upper part of the telescopic sleeve and plays a role in locking the telescopic thread connection in advance; and the dustproof sleeve is fixedly connected with the lower end of the nozzle seat after passing through the smooth outer surface of the lower section of the upper part of the telescopic sleeve, plays a dustproof role on an unmeshed threaded surface in the nozzle seat, and plays a limiting and anti-screwing role on the telescopic sleeve. The nozzle has the functions of locking, anti-rotation, quantitative adjustment and dust prevention, is simple in structure and convenient to use, and can spray stable protective airflow.

Description

technical field [0001] The invention belongs to the technical field of arc welding, and relates to a retractable nozzle for gas shielded welding capable of spouting stable airflow and a method of using the same. Background technique [0002] In gas shielded arc welding of narrow grooves or gaps or fillet welds, the conductive rod or electrode often needs to extend into the depth of the groove to guide the arc to weld at the deeper part of the groove. In the multi-layer welding process, while raising the position of the welding torch, it is often necessary to adjust the length of the external sleeve-shaped nozzle to keep the distance from the lower end face of the nozzle to the surface of the workpiece (ie, the height of the nozzle) to obtain good gas protection. Effect. [0003] The utility model patent with publication number CN205869680U discloses an "adjustable length gas shielded welding nozzle", which includes a nozzle body and a variable diameter nozzle installed on t...

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Problems solved by technology

[0004] (1) An air screen is not provided in the variable diameter nozzle at the end of the nozzle, so that the length of the laminar flow layer of the gas ejected from the nozzle is not constant during the adjustment of the nozzle length, and the self-sealing effect cannot be formed, thereby Affects arc stability and welding gas shielding effect; (2) When the head of the variable-diameter nozzle is provided with additional holes, as the length of the nozzle changes, the overlap between the nozzle body and the variable-diameter nozzle The length (equivalent to the length of the nozzle casing of the secondary shielding gas) will vary accordingly, resulting in an inconstant laminar layer length of the secondary shielding gas ejected from the additional hole, especially when the nozzle protrudes longer , the nozzle casing length and laminar layer length of the secondary shielding gas become shorter instead, so it is difficult to form a stable and effective secondary gas protection for the welding area in the groove; (3) when the variable diameter nozzle head When the additional hole is set, it will cause the welding shielding gas to diverge, thus directly affecting the stability and welding protection effect of the primary shielding gas ejected from the nozzle; (4) when used for narrow gap welding, the cylindrical nozzle Placed outside the bevel for use, because there is no space limitation, an adjustable nozzle with a larger cross-section can be directly used without using the variable-diameter nozzle with complicated additional holes; (5) the cylindrical nozzle is placed on When the narrow-gap welding groove is used externally, because the gas outlet is circular, the effective flow rate of welding shielding gas flowing into the I-shaped or U-shaped narrow-gap groove will be reduced, thereby affecting the gas shielding effect of narrow-gap welding; (6) No pre-locking measures have been taken for the threaded connection, and because no air screen is installed in the sleeve (variable diameter nozzle) at the end of the nozzle, no immediate self-locking can be formed during the use of the nozzle, which will easily lead to the adjustment of the adjustable nozzle. Shaking affects the stability of the airflow ejected from the nozzle; (7) There is no scale line for nozzle telescopic adjustment, which is inconvenient for quantitative adjustment

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