Non-sealed channel type continuous zinc impregnation device and method

Abstract

The invention relates to a non-sealed channel type continuous zinc impregnation device and method. The non-sealed channel type continuous zinc impregnation device comprises a channel, a preheating and heat preservation system, a heating and heat preservation system, a protective gas applying device, a zinc powder applying device and a conveying system, wherein the channel is composed of a plurality of sections; one end of each section is provided with a workpiece inlet, and the other end of each section is provided with a workpiece outlet; one or several sections serve as zinc impregnation sections which are internally provided with zinc impregnation spaces; heating elements of the heating and heat preservation system are arranged on the zinc impregnation sections; a protective gas conveying opening of the protective gas applying device communicates with the zinc impregnation spaces; a zinc powder conveying opening of the zinc powder applying device communicates with the zinc impregnation spaces; the conveying system is provided with a workpiece conveying part for conveying a metal workpiece along the predetermined route; and a part of the predetermined route of the workpiece conveying part is arranged along the workpiece inlets, the channel and the workpiece outlets. Gas protection atmospheres are formed in the zinc impregnation spaces, thus, zinc impregnation can be conducted in the open type channel, the zinc impregnation process can be continuously conducted, a lot of time occupied by temperature rise and temperature reduction of each furnace can be saved, the production efficiency is improved, and the caused energy wasting can also be avoided.

Description

technical field [0001] The invention belongs to the technical field of metal surface chemical treatment and metal material diffusion treatment. Specifically, the invention relates to a non-closed channel type continuous zinc sherardizing equipment and a continuous zinc sherardizing method. Background technique [0002] Zinc sheathing is a surface protection process to obtain a zinc-iron alloy layer on the surface of a metal workpiece by thermal diffusion. It is to place the zincizing agent and the metal workpiece in a zinc sherardizing furnace. At a predetermined process temperature, zinc atoms are transferred from the surface of the metal workpiece to Internal penetration, while iron atoms diffuse from the inside to the outside, thereby forming a uniform layer of zinc-iron compound on the surface of the metal workpiece, that is, the zinc layer, through which the cathodic protection of the metal workpiece is achieved. [0003] At present, the powder galvanizing treatment on ...

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Problems solved by technology

[0007] In this kind of sherardizing method, with the help of the rolling of the sherardizing tank, mechanical friction is formed between the zinc powder particles and the metal workpiece to speed up the reaction between the zinc atoms and the surface atoms of the metal workpiece, and achieve the effect of mechanically aided shedding. Limited by the rolling speed of the tank, the kinetic energy obtained is small, and the activation energy of the zinc atoms cannot be effectively stimulated. Moreover, since the filling and sealing operation of the furnace is required before zinc infiltration, and the furnace needs to be unsealed after treatment, the treatment process is still It can only be processed furnace by furnace. In addition, each furnace needs to be heated up before processing and cooled after processing. The whole processing time of each furnace part still needs 5 to 6 hours. It is expected to improve the penetration through mechanical rotation. The effect of zinc efficiency is still limited, and it is difficult to meet the beat requirements of continuous and large-scale production

[0008] In addition, although the rotary sheathing furnace separates the sealed rotary sheathing pot from the furnace, the rolling of the sheathing pot can improve the zincizing efficiency, but it cannot be realized due to the rotary motion of the sealed rotary Internal heating, but only through the heating element located between the furnace and the sealed rotary zinc pot, the sealed rotary zinc pot is heated from the outside first, and then the heat is transferred to the metal inside by the zinc pot The workpiece, which leads to the fact that part of the heat radiated by the heating element will be consumed by the furnace, and cannot be quickly and effectively conducted to the metal workpiece, which prolongs the time required for heating the metal workpiece (also prolongs the cooling time), reduces the efficiency, and makes The overall processing time of each tank becomes longer, and at the same time, heating and cooling the sherardizing tanks causes energy waste due to additional heat loss and increases thermal pollution to the environment

[0009] It can be seen that due to the limitation of equipment and process, the existing zinc sherardizing technology can only be processed in separate furnaces, and the processing capacity of a single furnace is small and the time is long. Each furnace can process 300-800 kg and 6-8 hours per furnace. According to calculations, it can only process 3 tons per day at most, and the production efficiency is very low, which cannot meet the needs of large-scale production, and it is difficult to ensure the uniformity of product quality. Moreover, each furnace needs to be heated and cooled, which not only wastes a lot of energy, but also may cause environmental pollution, which is not in line with the environmental protection trend of energy saving and emission reduction.

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