RU2354744C1 - Detachable feeding-and removal mechanism - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: detachable feed-and-removal mechanism installations vessel for diffusion coating fabricated metal products contain drum with radial webbing, parting grid, located oppositely to the tank bottom, at that drum from the side of parting grid is outfitted by screw, ambitus of blade of which are welded to internal surface of tank, and internal edges of blade are welded to external surface of swamped at both ends pipe, spanning angle of internal surface of drum by screw blade is from 480 up to 500 degrees.

EFFECT: improvement of diffusion coating of metal works, environmental safety of facility for diffusion coating of metal works and productivity of charge - discharge from the facility into retort or from retort into facility.

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Description

The invention relates to metallurgy and mechanical engineering and can be used to complete installations for applying anti-corrosion coatings to metal products.

Known loading and unloading device according to the application for the invention RU 93054253, which is part of the apparatus for coating metal products by the diffusion method.

The known device includes a estrus for a powder mixture, an estrus for hardware, a multi-turn auger located in the inner drum of the apparatus, windows made in the wall of the inner drum, zigzag elements mounted in the space between the inner and outer drums of the apparatus, a perforated or mesh shell connected to the output of the outer drum, located under the shell of the box for the selection of powder mixture, a screw blade located in the box for feeding powder into the inner drum, azgruzochnuyu chamber hardware coated and a discharge chamber for the powder mixture, the direction control valve for movement of the powder mixture.

The disadvantages of the known loading and unloading device are:

- design complexity;

- a significant total mass of the components and parts included in the device;

- high manufacturing costs;

- insufficient reliability.

Known removable loading and unloading device according to patent RU 2224817, which is part of the installation for coating steel products by the diffusion method and adopted by the applicant as a prototype.

Known removable loading and unloading device contains a cylindrical container with a neck and radial ribs, a diaphragm in the form of a semicircle, concave into the container, and a separation grid or mesh attached to the end of the neck. Cargo loops are welded to the outer surface of the tank.

The device operates as follows.

The container, previously filled with the charge, is brought to the retort of the coating unit, docked with it and fixed with grippers. In this case, the neck of the container enters the receiving part of the retort, previously loaded with steel products, and is tightly fixed by the outer diameter. The diaphragm of the cylindrical tank should be in the lower part of the neck of the tank, preventing the mixture from spilling out of it. After raising the retort to a predetermined angle and giving the retort rotation due to the edges of the vessel, the entire charge from the vessel is poured into the retort. Then the retort is brought into a horizontal position, its rotation is stopped, the container is removed from the retort, which is closed with a lid.

After the diffusion coating process is completed, the lid is removed from the retort and joined with an empty container to which the dividing lattice is docked. Raise the deaf part of the retort at a given angle and give the retort rotation. The entire mixture in the retort is poured into the tank. At the same time, the diaphragm of the container due to concavity plays the role of a funnel, and the dividing grid prevents the precipitation of processed products from the retort. Then the retort is brought into a horizontal position and its rotation is stopped. After this, the container is undocked from the retort, the processed products are removed from the retort or poured into a special container by lifting the blind end of the retort at a certain angle.

One of the disadvantages of the prototype is the uneven distribution of the charge in the retort of the installation for diffusion coating of steel products, especially long ones. This is due to the fact that the design of the diaphragm and its location in a cylindrical tank do not provide uniform precipitation of the charge from the tank. So, with the lower position of the diaphragm relative to the longitudinal axis of symmetry, the retort of the precipitation of the mixture from the tank may not occur at all, and with its upper position, the precipitation of the mixture can be avalanche-like. This leads to uneven thickness of the coating of products, especially products of a closed profile, such as pipes.

In addition, the presence of an aperture between the diaphragm and the neck of the tank leads to the penetration of a large number of dust particles into the space of the tank when unloading the charge from the retort through the separation grid and further dusting the production facilities.

Another disadvantage is the low productivity of loading and unloading the charge from the tank to the retort (or from the retort to the tank), since the charge mixture is unloaded by gravity and only 35% of the tank volume can be filled with the mixture. To increase productivity, it is necessary to increase the dimensions of the tank.

The technical result of the proposed technical solution is to eliminate the disadvantages of the prototype, namely:

- improving the quality of the diffusion coating of metal products;

- improving the environmental safety of the installation for diffusion coating of metal products;

- improving the loading and unloading of the charge from the device to the retort or from the retort to the device by creating additional pressure by the blades of the screw of the screw pushing the charge mixture into the retort or from the retort, which allows filling up to 75% of the volume of the screw with the charge without additional increase in its overall dimensions.

The technical result is achieved by the fact that in a removable loading and unloading device of the retort of the installation for diffusion coating of metal products containing a cylindrical container with radial ribs, a separating grate located opposite the bottom of the tank, according to the invention, the cylindrical capacity on the side of the separating grate is equipped with a screw, the outer edges of the blades of which welded to the inner surface of the tank, and the inner edges of the blade are welded to the outer surface of the muffled on both sides he pipes, the angle of coverage of the inner surface of the cylindrical capacity of the auger blade is from 480 to 500 degrees.

The supply of the cylindrical tank from the side of the separation lattice with the screw ensures that the charge of the charge from the cylindrical tank into the retort is uniform when the charge of the retort of the installation for diffusion coating of metal products is loaded. This, in turn, allows you to evenly distribute the mixture between the processed products, especially long ones, which provides a protective coating of the same thickness over the entire area of the products. Thereby, the quality of the processed products is improved in comparison with the prototype.

In addition, when unloading the charge from the retort, the auger blade serves as a lid that prevents dust particles from the retort from entering the inner space of the cylindrical container, which increases the environmental safety of the production process.

The angle of coverage of the inner surface of the cylindrical container with the screw blade at the lower limit, namely 480 degrees, is selected empirically and is sufficient to fully protect the internal space of the container with the screw from dust particles.

The coverage angle at the upper limit, namely 500 degrees, should not be exceeded due to the fact that this leads to an inappropriate increase in the longitudinal dimension of the cylindrical container, and hence its mass.

The essence of the proposed invention is illustrated by drawings.

Figure 1 shows a longitudinal section of a device.

Figure 2 shows a view A of figure 1.

Figure 3 shows a section bB in figure 1.

The loading and unloading device contains a cylindrical tank 1 with radial ribs 2, docked to the tank 1 on the pins 3 installed in the plates 4, a separation grid 5. From the side of the grid 5, a screw 6 is mounted in the tank 1, the outer edges of the blade 7 of which are welded to the inner surface capacity 1, and the inner edges of the blade 7 are welded to the outer surface of the pipe muffled on both sides 8. The angle of coverage of the inner surface of the cylindrical container 1 by the blade 7 of the screw 6 is from 480 to 500 degrees. A ring 9 of wire is welded to the inner ends of the ribs 2 on the side of the screw 6, and a band 10 is welded on the side of the bottom of the tank 1. An opening 11 is made in the bottom of the tank 1 to remove the ballast mixture. The hole 11 is closed by a removable cover 12 with a gasket 13 with screws 14 attached to the bottom of the tank 1. A flange 15 is welded to the tank 1, in which holes 16 and grooves 17 are made. Cargo loops 18 are also welded to the tank 1.

Before loading into the retort of the installation for diffusion coating of hardware and before unloading from the retort of the charge, the cylindrical container is centered relative to the retort using pins mounted on the retort flange, included in the grooves 17 made in the flange 15 of the proposed device, and attached to the retort flange using bolts, for which holes 16 are provided on the flange 15.

The separation grid 5 is installed on the pins 3 of the tank 1 only before unloading the spent charge from the retort.

After attaching the loaded charge of the cylindrical container to the retort loaded with uncoated products, the retort is rotated and the fastened nodes are raised by a predetermined angle. Due to rotation, as well as the impact on the charge of the ribs 2 of a cylindrical capacity, the charge along the stream of the screw 6 is uniformly poured into the retort. In this case, there are no interruptions in the supply of the mixture and there are no avalanche-like breakdowns of the mixture in the retort.

After loading the retort with the charge, the retort is brought into a horizontal position, the rotation is stopped, the cylindrical container is removed from the retort, which is closed with a lid.

After the end of the diffusion coating process, the lid is removed from the retort and joined with an empty cylindrical container, to which the separation lattice is pre-docked 5. Raise the blind part of the retort by an angle and give the retort rotation. The mixture through the separation grid 5 and the stream of the screw 6 is evenly poured into a cylindrical container. In this case, dust particles due to the screw acting as a cover are retained in the space of the retort and the screw stream, from where they are subsequently removed.

Claims (1)

A removable loading and unloading device of the retort of the installation for diffusion coating of metal products, containing a cylindrical container with radial ribs, a separating grid located opposite the bottom of the tank, characterized in that the cylindrical tank on the side of the separating grill is equipped with a screw, the outer edges of the blades of which are welded to the inner surface of the tank and the inner edges of the blade are welded to the outer surface of the pipe muffled on both sides, the angle of coverage of the inner surface the cylindrical capacity of the screw blade is from 480 to 500 °.

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