SU831855A1 - Device for hot zinc-plating - Google Patents

Description

(54) DEVICE FOR HOT GALVANIZING

one

The invention relates to metallurgy, is intended to apply protective coatings by the hot method and can be applied in the manufacture of metal products and small items.

A device for induction heated galvanizing is known, in which an inductor heater is mounted on the side wall of the bath {1J.

However, the known device does not allow to control the flow of heated metal and regulate the temperature in the bath in working and non-working conditions, which adversely affects the quality of the coating of products, in particular, due to its uneven and unjustifiably large thickness, as well as the service life furnaces due to the uneven heating of the bath and the overgrowing of the channels from the base.

The purpose of the invention is to increase the quality of the coating and increase the service life.

To achieve this goal, the device, containing a channel for the coating material with channels, an inductor-heater and a pump, is equipped with guide vanes installed in the channel mouths and can be rotated. The blades are lined with heat-resistant material or made of graphite.

FIG. 1 shows the proposed device, a general view; in fig. 2 and 3

the location of the blades; in fig. four -. device (oven) in the start mode; Fig. 5 is the same at the time of coating the products; in fig. 6 the same, in an interoperable state;

in fig. 7 is the same in storage mode. The device includes a bath 1, a magnetodynamic pump 2 mounted on the side of the bath, containing an electromagnet 3 with side and

central channels 4-6. Channels 4 and 5 are covered by inductor-heaters 7 with magnetic cores 8. With the help of a rotating mechanism 9, the bath can be tilted as necessary.

The blades 10 and 11 are located in the mouths of the canals on the side of the bath 1. The vanes are installed in pairs, above and below the channel. Each pair of blades is mounted independently of each other and can be installed at any angle to the channel. Outside the bath is the actuator 12.

The blades and all the controls that are in contact with the melt,

lined with refractory and resistant

melt material. Blades can Syt made of graphite.

The device works as follows.

Before starting the operation mode, the bottom of the bath 1 is filled with liquid metal, for example zinc. The bath is inclined by the noBopoTHhJM mechanism 9 so that the liquid metal fills the channels 4-6. Include the inductor-heater 7. The blades are set so that the flow of heated metal is directed downwards. The bath is filled with solid metal in an amount necessary to form the working volume of the melt. The liquid metal flows from the bath into channels 4 and 5, heats up and is thrown into the bath through channel 6, gradually melting all the metal.

The bath returns to its original position when the amount of molten metal in the bath becomes sufficient to close the channels 4-6 when the bath is horizontal.

The whole mass of metal can be loaded into the bath in the solid state. In this case, its melting can be carried out in a known manner with the help of a cover-heater.

After heating the melt to the operating temperature (465-510 ° C for zinc), the central blades 10 are oriented so that the flow of rasppava leaving the channel is directed upwards. The side vanes 11 are then arranged horizontally to collect the melt from the middle part of the bath, where the melt temperature is the most stable.

A container with the parts prepared for coating is dipped into the bath. After the parts are kept in a steady flow, the reaction between the melt, the flux and the product turns on the pump for more intensive melt mixing. A directional flow of metal with a temperature of 510530 ° С washes away the workpieces. The flow expels the sinter to the surface from where it is periodically removed.

With a 150 kg load, the zinc time is approximately 1 minute. After completion of the process and removal of the parts from the bath, the blades 10 and one pair of vanes 11 are placed in a horizontal position, and the second pair of vanes 11 are set to collect melt from the top of the bath. When this occurs, a partial precipitation of the hard zinc occurs.

After finishing the operation, the device is put into storage mode, the electromagnet 3 is turned off, the blades 10 are left in a horizontal position, and both pairs of blades 11 are pointing upwards to prevent the formation of a crust on the surface of the bath. A calm zone with a temperature of 450-465 ° C is formed in the lower part of the bath. There is an intensive precipitation of melt zinc from the melt. Before each

5 the inclusion of the installation in the bath mode should be thoroughly cleaned of zinc and izgari.

Flow control allows uniform coverage of parts.

0 thickness of 40-60 microns. Significantly increases the service life due to a decrease in temperature gradients at various points in the bath (both in the operating mode and in the storage mode) and the reduction of clogging and overgrowing of the channels from the edge. In addition, the productivity of the furnace is improved and the metal consumption for coating is reduced.

Claims (3)

1. A device for hot-dip galvanizing, containing a bath for a coating material with channels, an inductor heater and a pump, characterized in that, in order to improve the quality of the coating and increase its service life, it is equipped with guide vanes installed in 0 ust channels with the possibility of rotation. 2. A device according to claim 1, characterized in that the blades are lined with heat-resistant material. five 3. The device is a popp, 1 and 2, characterized in that the blades are made of graphite .. Sources of information, taken into account in the examination 1. Guide to hot galvanizing. Trans. with him. M., Metallurgists, 1975, p. 219-220, fig. 60, (par.Z (Par.