US2853286A

US2853286A - Movable hearth furnace

Info

Publication number: US2853286A
Application number: US398178A
Authority: US
Inventors: Montagna Carlo
Original assignee: Dalmine SpA
Current assignee: Dalmine SpA
Priority date: 1952-12-15
Filing date: 1953-12-14
Publication date: 1958-09-23
Anticipated expiration: 1975-09-23

Description

Sept. 23, 1958 c. MONTAGNA 2,853,286

MOVABLE HEARTH FURNACE Filed Deo. 14, 1953 @da la@ ,0N

United States Patent O MOVABLE HEARTH FURNACE Carlo Montagna, Dalmine, Italy, assignor to Dalmine S. p. A., Milan, Italy, a corporation of Italy Application December 14, 1953, Serial No. 398,178

Claims priority, application Italy December 15, 1952 2 Claims. (Cl. 263-28) The present invention relates to hearth furnaces.

It is known that in heating or annealing furnaces having movable hearths, it is necessary for avoiding eX- cessive heat losses that the furnace zones at higher temperatures be shielded from the cooler zones. For this purpose protecting walls are suspended from the furnace side walls in such a manner as to leave an opening of limited height in order not to hinder the movement of the hearth.

It frequently occurs, however, that treated material which should have been discharged remains on the hearth and strikes against the dividing wall. The replacement of the damaged wall requires considerable work as well as the stopping of the furnace for an undesirable cooling period.

It is accordingly an object of the invention to provide an improved structure for the utilization of dividing walls in furnaces having movable hearths.

According to the invention, a construction is obtained that avoids the aforesaid inconveniences in that the direct damages caused by an occurrence of this kind are rendered less important. Particularly repair work can be rapidly effected and does not require the stopping of the furnace for a cooling period.

The invention contemplates making a dividing wall in two contacting parts having no positive connection. These parts may include an upper fixed portion suspended or anchored on the side walls of a furnace during construction and another detachable part capable of being introduced into the furnace through side openings by means of special equipment which will be more fully described hereinafter and which is a feature of the invention.

The detailed provisions of the invention are next explained with reference to the accompanying drawing in which the sole figure illustrates a furnace having a movable hearth and further provided with a dividing wall arrangement in accordance with the invention.

In the drawing, 1 indicates the side wall of a movable hearth furnace 2 in which according to the invention, a half dividing wall 3 is supported by an upper frame 4.

2,853,286 Patented Sept. 23, 1958 ICC 2 A half dividing wall 5 is introduced into the furnace through the side openings 6 and is maintained in position by shoulders 7 which are held in place by beams 8 as will be shown.

The half wall 5 generally has the shape of an arch and is positioned initially between shoulders 7 arranged in spaced relation (whereat they are maintained by tie rods 14) upon a shovel 9 attached to a lever 10 provided with a counterweight 11. Two eyes 12 and 13 are located on the lever 10 for the balance of the empty shovel and for the shovel loaded with the weight of a wall 5, respectively. With the arch on the shovel, the latter is lifted by means of a crane and inserted into the furnace through opening 6, wall 5 being positioned between the shoulders 7 which are locked together by means of tie rods 14 as aforesaid.

The two beams 8 are then placed against shoulders 7, whereupon tie rods 14 are removed and the shovel is pulled out leaving in place the wall 5 to complete the protecting wall. Subsequently, openings 6 are closed with readily demounted refractory bricks.

It will be apparent that the structure described above, as well as the method of using the same, lends itself to a simple replacement of half wall 5 in the event that this element deteriorates to any great extent.

I claim:

1. A furnace with a movable hearth comprising side walls adjacent said hearth, a first dividing wall portion permanently fixed to said side walls and extending across said hearth but spaced therefrom, said side walls defining openings beneath said first wall portion, a second dividing wall portion insertable through said openings for being positioned beneath and adjacent said first wall portion to constitute therewith a substantially continuous dividing wall, shoulders removably positioned in said openings for bracing said second wall portion in position adjacent said first wall portion, and beams abutting said shoulders for holding the same and thereby said second wall portion in position.

2. A furnace as claimed in claim 1 comprising detachable tie rods coupled to and extending between said shoulders for limiting relative movement between the same.

References Cited inthe file of this patent UNITED STATES PATENTS 1,339,615 Wundrack May l1, 1920 1,394,471 Charles Oct. 18, 1921 1,457,443 Liptak June 5, 1923 1,569,923 Gudmundsen et al Jan. 19, 1926 1,783,156 Talley NOV. 25, 1930 2,103,170 Newhouse et al Dec. 2l, 1937 2,296,791 Keener et al Sept. 22, 1942 2,611,330 Kirk Sept. 23, 1952 2,699,740 Weber Ian. 18, 1955