SU47708A1 - Shiber for shaft furnaces - Google Patents

Description

The proposed gate serves for hermetic locking of the lower hole in the heating shaft furnaces and is made in the form of two sliding wedge-shaped dampers, one of which is equipped with a sand gate. The gate prevents cold air from sucking in, which causes oxidation of the products and creates an uneven temperature at different horizons of the furnace, which is especially harmful when heat-treating long products (for example, aircraft alloy steel).

In the drawing, FIG. 1 is a longitudinal section of the furnace with a general view of the installation and a gate in the closed position; FIG. 2-the same gate in the open position; FIG. 3-second embodiment of the gate (with the expansion of the flaps in different directions).

The device is as follows. At the lower opening of the furnace 1 with the products 2 loaded into it, the guides 3 are fixed with a wedge-shaped damper 5 suspended on them /. The damper 5 is suspended on double rollers 7 and 7a, covering the shelves of the guide 3 on both sides, because may rise above a gently curved rail.

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The upper flap 4 is provided with rollers 8 at the bottom and freely moves along guides 18 fixed on the lower flap 5.

In the upper part of the shutter 4 there is a sand shutter 9, into which an annular knife 10 installed on the lower part of the furnace enters. The shutters are provided with hooks 11 for attaching the pull ropes 12 to such ones. with a roller 16 preventing the horizontal displacement of the valve 5 and forcing the latter to tightly press against the lower opening of the furnace. To lower the valve 5 when opening the gate, there is a reverse stop 13 with a roller 14 mounted on the other side of the guide 3 and preventing horizontal movement of the valve 5 at the first moment of movement of the valve 4.

A shock absorber 17 prevents blows of the upper flap against the lower flap.

The device operates as follows. In their original position, the upper and lower flaps are pulled out of the furnace.

The upper flap 4 has its own weight becomes the lower one at the lowest

position; When the lower flap 5 moves under the furnace, the upper flap 4 will also move with it until it stops at the roller 16 of the stop 15 and then the upper flap 4 rolls along the lower wedge 5 and rises up, tightly pressing against the furnace hole.

At the lower opening of the furnace there is an annular blade 10, which is tightly cut into the sand plug. Thus, there will be no penetration of cold air into the furnace. If the gate is required to open, the lower flaps 5 are moved in the opposite direction behind the hook 12. The upper flap stops against the back rest 13 and will have to move vertically down its roller 14, i.e., to be pushed out of the furnace hole until it drops below roller 14 and will not pass free stop.

Further movement of the upper flap is accomplished by horizontal movement of the lower flap.

In the first embodiment (Figs. 1 and 2), both dampers move to one side when the furnace is opened, which is not the case.

always convenient when servicing stoves. Therefore, according to the second variant (Fig. 3), the upper flap 4 is suspended independently on the rollers 6, the stop 15, 16 is removed, which allows the flap 4 to be moved to the side opposite to the movement of the lower flap 5.

Pred inventions.

Claims (1)

1. A gate for the heating shaft furnaces using a sand gate, characterized in that it consists of two wedge-shaped parts 4 and 5 moving one over the other (gates), of which the lower part 5 is made movable along horizontal rails 3 , a, for the upper part 4, there is an emphasis 19 on the lower part 5 and an emphasis 15 against the wall of the furnace in order to realize Kai; horizontal and vertical movement of the upper part 4. 2- A modification of the gate according to claim 1, characterized in that both the wedge-shaped parts 4 and 5 (flaps) are made movable towards each other along the guides 3.