SU850702A1 - Circular furnace for thermal treatment of rings - Google Patents

Description

one

The invention relates to heat treatment and can be used in the heating and cooling of short cylindrical articles, such as rings and other pipes.

Known annular furnace, in the form of a lined annular working chamber, including heat sources, stationary installed arch with annular. inner and outer walls and a horizontally rotating hearth. Water (or sand) closures 1 are installed between the stationary walls and the moving bottom.

During heat treatment of the rings in the specified furnace design, they are placed on the hearth and transported through the working chamber in the specified position.

A disadvantage of the known annular furnace is the uneven heating (cooling) of the rings around the perimeter and in height, leading to a distortion of their geometrical dimensions, as well as a difference in mechanical properties along their section. This is due to the fact that with a fixed installation on the bottom of the ring during the heat treatment process they are subjected to a greater temperature effect from the side and side walls than from the bottom, which is especially characteristic in the initial stage of heating.

The closest in technical essence and the achieved result to the proposed is an annular furnace containing a lined working chamber with a rotating hearth,

10, a mechanism for rotating articles in the form of cantilever rollers arranged in pairs parallel to the radius of the furnace and rigidly connected with the bottom group drive 2.

15

The disadvantage of this furnace design is low productivity. This is because each pair of rollers provides heat treatment for only one

20 batches (cages) of products. At the same time, there are large empty sections between the pair-parallel rollers, which drastically reduces the furnace capacity, and, consequently, its performance.

The purpose of the invention is to increase the capacity of the furnace by increasing the capacity.

The goal is achieved by the fact that in an annular furnace, I turn on 30

adhey lined working chamber with rotating bottom, the mechanism of damage to products in the form of cantilever rollers rigidly connected with the bottom group drive, the axis of rotation of the rollers are located radially,

FIG. 1 shows a circular oven, horizontal section; in fig. 2 shows section A-A in FIG. one; FIG. 3 is a section BB in FIG. 2.

The furnace for heat treatment of the Rings consists of a stationary dome 1, with an outer annular wall 2 of the bottom 3 ,. horizontally rotating and rigidly connected with the inner annular wall of the circular roof 5, blocking it, as well as sources 6 heatj | a (gas burners). The bottom 3 with an inner annular wall 4 and a circular arch 5 has an individual drive 7. The movable and stationary elements of the furnace are sealed with a water shutter 8. In the working chamber of the furnace, at the required height from the bottom 3, the rollers 9 are installed uniformly along the ring of the inner wall 4 radially located. Outside the working chamber in the center of the furnace is a group drive, furnace rollers 9 consisting of an electric motor (not shown), a gearbox 10, the driven wheel shaft of which ends with gear 11 engaging with a gear wheel 12, which is mounted on the central shaft 13, ending from the opposite side of the wheel

14, having a conical crown gear. Bevel gears are engaged with crown gears.

15, each of which is mounted on the drive shaft of the gearbox 16, providing rotation of the roller 9. Group drive of the rollers 9 together with the housing 17 is rigidly connected to the bottom 3. Pbd g 3 installed annular

 18, for powering a group drive. The cooling system of the furnace rollers includes a supply pipe 19, drain pipes 20, a drain funnel 21 located in the hollow part of the central shaft 13 of the group drive.

The furnace works as follows.

The rings 22 are put on by the machine 23 (a part of it is shown in Fig. 2) through the loading window on the rollers 9. During the loading operation, the bottom 3 is stopped and the rollers 9 rotate, rotating the rings 22 together. After that, the bottom rotates together with the rotating rollers and rings on them, group-driven rollers, an inner wall and a circular arch by means of an actuator 7. Then the next batch of rings is loaded. Simultaneously with loading of the rings, they are also unloaded. The speed of movement of the bottom, taking into account the time of stops for loading and unloading, is chosen from the conditions of heat treatment of the rings.

Q During the movement of the bottom 3 (between loading and unloading operations), the rollers 9 through the gear system 10--16 of a group drive with an electric motor, powered by the trawl 18, rotate, rotating the rings 22 together.

Thus, the proposed furnace in comparison with the known has a higher performance. This is achieved by increasing the furnace capacity.

0 due to the fact that the processing of each batch (set) of the rings is performed on one radially arranged cantilever roller. In a known oven, such processing is impossible due to

5 limited spacing between pairs of rollers. In addition, the radial placement of the axes of rotation of the rollers eliminates the dead zones between the pairs of rollers of the known design of the furnace and makes it possible to evenly arrange them in the working chamber.

The proposed furnace design allows the production of thermal

g processing with guaranteed rotation of narrow rings, for which the ratio H / Dil (H height, D diameter of the ring), excluding their overturning at loss of stability, which is typical for processing products (rings),

Claims (2)

1. Grigoriev V.K. Ring furnace heating. M ,, Metallurgizdat, 1958, s, 3-9. 2. USSR author's certificate Yo for the application number 2448577 / 22-02, cl. F 27 V 9/00, cl. C 21 D 9/00, 1977, 76 U // U / rig. Z 5-B