Gas mixing and supplying device in saw blade tempering furnace

Abstract

The invention discloses a gas mixing and supplying device in a tempering furnace. By means of the gas mixing and supplying device in the tempering furnace, gas in the tempering furnace can be evenly distributed, and convex points capable of easily adhering to a paint surface are easily generated on the surface of a tempered saw blade. The device comprises a spiral gas supply pipe arranged on the inner wall of a furnace body, and at least three gas distribution pipes which penetrate through the gas supply pipe and are arranged on the inner wall of the furnace body in the axial direction of thefurnace body. The device further comprises a closed cylinder arranged outside the furnace body. Two annular supports are oppositely arranged in the cylinder, bearing blocks are arranged on the annularsupports, a mixing shaft penetrates between the two bearing blocks, and a power device for driving the mixing shaft to rotate is arranged on the cylinder. A plurality of circulating holes allowing gas to pass are formed in the supports, and an oxygen inlet pipe and a nitrogen inlet pipe are arranged on one side of the cylinder. Two to four turbine blades are arranged at the two ends, outside thebearing blocks, on the mixing shaft respectively, a gas outlet pipe is arranged on the other side of the cylinder, the gas outlet pipe is connected with the gas supply pipe in the tempering furnace, and an air guide cylinder sleeves the mixing shaft and is arranged between the two supports.

Description

technical field [0001] The invention relates to a gas mixing and supplying device in a saw blade tempering furnace. Background technique [0002] In existing tempering furnaces, stirring shafts are often used to distribute the heated gas (usually nitrogen) in the furnace evenly, such as a tempering device described in patent ZL201720293559.7. Otherwise, there will be multiple tempering dead angles in the furnace cavity during tempering, and the uniformity of the temperature field will be poor, which will cause uneven heating of the workpiece, affect the tempering quality, increase the unqualified rate, and increase the cost; and most of the workpieces cannot be stacked. Low utilization. [0003] Saw blades are usually tempered and need to be taken out of the tempering furnace for pickling and then surface phosphating to produce a bumpy surface for better adhesion of paint when subsequent painting. This process is complex and During the production process, a large amount of...

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Problems solved by technology

Otherwise, there will be multiple tempering dead angles in the furnace cavity during tempering, and the uniformity of the temperature field will be poor, which will cause uneven heating of the workpiece, affect the tempering quality, increase the unqualified rate, and increase the cost; and most of the workpieces cannot be stacked. low utilization

[0003] Saw blades are usually tempered and need to be taken out of the tempering furnace for pickling and then surface phosphating to produce a bumpy surface for better adhesion of paint when subsequent painting. This process is complex and During the production process, a large amount of waste liquid that needs post-processing to avoid environmental pollution is generated, and the processing cost is high

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