RU2255985C1 - Article quenching device - Google Patents

Abstract

FIELD: steel heat treatment, particularly quenching of large pipeline fasteners.

SUBSTANCE: article quenching device comprises quenching tank with coolant and table installed inside the tank so that table may be lifted and lowered onto inclined tank bottom part. Table is provided with stop preventing article sliding down during table tilting. Forced coolant circulation chamber having inlet orifices for coolant intake from tank formed in upper chamber part is arranged on one wall, particularly on quenching tank wall. Forced coolant circulation chamber has outlet means located in lower part thereof adapted to provide additional directed coolant flow twisting to increase flow velocity. Centrifugal pump or screw propeller is installed inside forced coolant circulation chamber to provide directed coolant circulation inside tank. Quenching tank bottom has inclination angle of not less than 30° and not more than 45° to horizon in direction from forced coolant circulation chamber to opposite quenching tank wall, which facilitates coolant circulation around article to be cooled.

EFFECT: provision of forced coolant circulation through the article, around the article and under it.

5 cl, 2 dwg

Description

The invention relates to heat treatment of steel and is intended for use when hardening the connecting parts of pipelines (SDT) of large sizes.

To obtain high-quality SDT, uniform cooling and high speed during quenching of products are required.

A device for cooling products containing a quenching chamber and a system of nozzles providing intensive cooling of all surfaces of tubular parts, in particular hollow rollers (see RF patent for the invention No. 2089624, IPC - 6: C 21 D 1/62, application 29.03. 1997).

The disadvantage of this device is that it cannot be used for cooling large-sized products, which usually have an asymmetric shape.

The closest in essential features and achieved effect to the claimed device for cooling products and selected as a prototype is a device according to the application of the Russian Federation No. 94003367 for the grant of a patent for the invention of IPC - 6: C 21 D 1/63, declared 20.10.1995. The known device comprises a quenching tank with liquid refrigerant, in which a table with a lifting and lowering mechanism is installed, made in the form of a spring placed between the telescopic elements of the table support.

A disadvantage of the known device is the movement of the table strictly in a horizontal position, which makes it difficult to obtain uniformity of cooling - a necessary condition for ensuring high quality products.

The task of the claimed device is the uniform cooling of the product with liquid refrigerant.

The technical result that allows us to solve the problem is to create a forced circulation of the flow of refrigerant through the product, around it and under it.

This task is achieved by the fact that in the known device for cooling products containing a quenching tank with liquid refrigerant and a table installed with the possibility of raising and lowering in it, according to the invention on one of the walls of the quenching tank is placed a forced circulation chamber of the refrigerant, equipped with inlet openings at the top and the outlet below, and the bottom of the quenching tank is raised at an angle of 30-45 ° to the horizontal in the direction from the chamber to the opposite wall of the quenching tank.

A device for cooling products can be equipped with a pump installed in the chamber forcing the refrigerant.

A device for cooling products may be provided with a propeller installed in the forced circulation chamber.

A device for cooling products may have a rounded outlet of the forced circulation chamber.

In the device for cooling products, the table in its lowest position can be mounted on the inclined part of the bottom of the quenching tank.

Studies on patent and scientific and technical sources of information indicate that the proposed design of a device for cooling products is unknown and does not follow explicitly from the studied prior art, and therefore meets the criteria of “novelty” and “inventive step”.

The inventive device for cooling products can be manufactured in industrial production using standard domestic or imported equipment, known materials and technologies.

Thus, the inventive device for cooling products meets the criterion of "industrial applicability".

The proposed set of essential features informs the claimed device for cooling products of new properties that allow us to solve the problem.

The angle of inclination of the bottom of the quenching tank was selected experimentally. When the angle of inclination to the horizontal was less than 30 °, the quenching parameters turned out to be worse, which meant uneven cooling. An increase in the angle of inclination over 30 ° to 45 ° significantly increased the uniformity of cooling and improved quenching parameters. At an angle of over 45 °, the part stood on the end, and the center of gravity of the table shifted, causing the table to jam.

The inclined bottom of the hardening tank does not allow the table in its lowest position to fall horizontally, which creates the best conditions for steam removal and cooling.

The creation of a continuous flow of refrigerant under the table, through the product and around it is provided by the claimed design of the forced circulation chamber and quenching tank. For most of the flow following, guides have been created: the chamber itself with a rounded outlet, the inclined bottom of the quenching tank and its wall opposite the chamber contribute to the twisting of the flow around the product. When the flow strength dries up when rising to the wall of the quenching tank, there is a forced sampling of the refrigerant.

The essence of the proposed device for cooling products is illustrated by drawings, which depict on:

Figure 1 is a side view of the inventive device, a vertical section;

Figure 2 is a top view of the inventive device.

A device for cooling products contains a quenching tank 1 with a refrigerant 2 and a table 3 mounted in it with the possibility of raising and lowering. Table 3 is a lattice structure with a stop 4, which prevents the product 5 from slipping when the table 3 is tilted. In Fig. 1, table 3 with the product 5 is shown in its lowest position, i.e. mounted on the inclined part of the bottom.

On one of the walls, for example 6, of the quenching tank 1, there is a chamber 7 for forced circulation of refrigerant 2, which in its upper part has inlet openings 8 for collecting refrigerant 2 from the tank 1. The chamber 7 is box-shaped, tubular or otherwise shaped with a rectangular or rounded outlet below 9, further twisting the directed flow of refrigerant 2 and increasing its speed. A centrifugal pump 10 is installed inside the forced circulation chamber 7. Instead of a pump, a propeller or the like can be taken for this purpose. unit. The pump 10 provides directional circulation of the refrigerant 2 inside the tank 1, shown by arrows (not indicated by numbers).

The bottom 11 of the quenching tank 1 is located at an angle of 30-45 ° to the horizontal in the direction from the forced circulation chamber 7 to the opposite wall 12 of the quenching tank 1, which facilitates the passage of the flow around the cooled product 5. The optimal incline is 35 °.

The inventive device for cooling products operates as follows.

The heated product 5, for example, a tee, is transferred from the furnace to the quenching tank 1 on the forklift trunk and there it is placed on table 3, which is located in the upper horizontal position above the level of refrigerant 2. After removing the trunk from the internal cavity of product 5, the forklift truck moves off and table 3 immediately immerses in the refrigerant 2 of the quenching tank 1, held at an angle of 30-45 ° to the horizontal by means of a cable system and hydraulic control (not shown in the drawings). Lowering at an angle allows the bubbles of the vapor formed in the cavity of the tee to go up, i.e. removed even before the churning of the “steam jacket” will be carried out by forced flow of refrigerant 2. To obtain good hardening parameters, you should quickly remove the steam from the surface, which happens in the claimed design.

The pump 10 takes the refrigerant 2 from the upper layers through the inlet openings 8 of the forced circulation chamber 7 and throws it out at a high speed through the rounded outlet 9 into the lower layers. Hence, the flow of refrigerant 2 extends into the inside of the cooled product 5 and under it and around it. This provides a fairly uniform cooling of the product. Then, the directed flow, passing along the inclined bottom 11 and turning upward along the wall 12, begins to lose strength and could completely stop its movement if it were not forcing the pump 10, which carries out the continuous intake of refrigerant 2 from the quenching tank 1.

At the end of the cooling process, the table 3 with the product 5 rises upward in an inclined position so that the refrigerant 2 poured out of the internal cavities of the product, and then takes the initial horizontal position. The cooled product 5 is removed from the table 3 with the trunk of a forklift truck and taken away for further processing. The quenching tank 1 receives another product 5. The cycle is repeated.

The advantages of the claimed device:

- improving the quality of hardening of large-sized products of complex shape;

- simplicity of the design of the device for cooling products;

- convenience of service.

Claims (5)

1. A device for cooling products containing a quenching tank with liquid refrigerant and a table mounted with the possibility of raising and lowering in it, characterized in that on one of the vertical walls of the quenching tank there is a forced circulation chamber for the refrigerant, equipped with inlet openings at the top and an outlet at the bottom, and the bottom of the hardening tank is raised by an angle of more than 30 °, but less than 45 ° to the horizontal in the direction from the chamber to the opposite wall of the hardening tank, 2. The device for cooling products according to claim 1, characterized in that a pump is installed in the forced circulation chamber of the refrigerant. 3. The device for cooling products according to claim 1, characterized in that a propeller is installed in the forced circulation chamber. 4. The device for cooling products according to claim 1, characterized in that the release of the forced circulation chamber is rounded. 5. The device for cooling products according to claim 1, characterized in that the table in its lowest position is installed on the inclined part of the bottom of the quenching tank.

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