JPS6122999Y2 - - Google Patents

Description

[Detailed description of the invention] The invention is a heating furnace that continuously hardens a large number of rods of a certain length, such as shafts, and the rods are placed at the entrance of the heating furnace one at a time. The present invention relates to a device for transferring bars in a heating furnace, in which the bars are supplied, heated to a predetermined temperature while being transferred from an inlet to an outlet, and are taken out one by one at regular intervals from the outlet.

Conventionally, the bar transfer device used to transfer bars from the inlet to the outlet in a heating furnace consists of a fixed support made of heat-resistant steel, which has a number of bar support parts arranged at predetermined intervals on the upper surface, and It has a structure that combines a driving support made of heat-resistant steel with the same number of support parts that operate to transfer each bar on the support part of the fixed support to the support part in the immediately preceding position. Two rows or several rows of fixed bearings connected from the inlet to the exit of the heating furnace and two or several rows of several driving bearings connected alternately. It has a similar structure.

Since the present invention is an improvement of the above-mentioned heating furnace bar material transfer device, we will first explain the conventional heating furnace bar material transfer device in Figs. 1, 2, and 3.
This will be explained using figures.

The heating furnace 1 has an inner surface surrounded by a refractory wall 2, an inlet section 3 and an outlet section 4, and a bar transfer device for transferring the bar material from the inlet section 3 to the outlet section 4.

A bar supply means is provided at the inlet 3 to feed the bar into the heating furnace 1 one at a time at a fixed time, and at the outlet 4 the bar is heated to a predetermined temperature while being transferred. A means for taking out bars is provided to take out one bar from the furnace every hour. Further, several combustion devices and several combustion exhaust gas extraction devices are provided at appropriate positions on the relatively upper wall of the heating furnace 1, thereby maintaining the inside of the heating furnace 1 at a predetermined temperature atmosphere.

The conventional bar transfer device installed in the heating furnace 1 includes a fixed support 5, which is a heat-resistant steel casting product containing a large amount of nickel chrome, and has a large number of support parts 6, 6', etc. at predetermined intervals on the upper surface. Two or several rows of several units connected in succession from the inlet part 3 to the outlet part 4 are provided. In addition, the same number of support parts 8, 8', etc., which operate to move the bar supported by each of the support parts 6, 6', of these fixed support devices 5, to the support part in the immediately preceding position at predetermined time intervals are provided. Two or several rows of seven drive bearings made of heat-resistant steel castings connected in series from the inlet part 3 to the outlet part 4 are provided. These fixed bearings 5 and drive bearings 7 are generally provided alternately in each row, and a refractory brick layer 9 is provided below these bearings 5 and 7. Heat-resistant steel columns 10, 10'... are provided to support the fixed supports 5, 5', respectively, and these columns 10 penetrate the firebrick layer 9, and the respective columns 10, 1
The lower ends of 0'... are attached to a fixed beam 11 made of general steel. In addition, heat-resistant steel columns 12 are provided to support the respective driving supports 7, 7, etc., but these columns 12 are passed through a rectangular cylinder 13 provided in the firebrick layer 9 and having a long axis in the traveling direction. and is attached to a driving beam 14 provided below. The driving beam 14 is provided with a beam 15 that moves back and forth in the direction of movement of the bar material at appropriate times using a first hydraulic cylinder, and a second hydraulic cylinder that moves the driving beam 15 with respect to the advancing and retracting beam 15.
4 to move up and down. The first and second hydraulic cylinders are then actuated in time and one after the other for a predetermined distance, and each bar is moved from one bearing to the bearing immediately preceding it. That is, the drive beam 14 and the drive support 7 first perform an upward movement A, as shown in FIG. 4, to lift the bar upward from the support portion 6 of the fixed support 5. A forward movement B is then carried out to advance the bars above the immediately preceding bearing, and a downward movement C is then carried out to move each bar relative to the previous bearing of the fixed support to its immediately preceding bearing. Then, perform backward motion D to return to the position immediately before performing ascending motion A. By repeating motion ABCD at regular intervals in this manner, each bar can be successively moved to the support at the immediately preceding position.

In the heating furnace 1, for example, if the bar is made of steel and is to be hardened, a specific position within the heating furnace must be maintained at a high temperature of 1000° C. or higher. Therefore, even if the fixed support 5 drive support 7 and the supports 10, 12 are made of heat-resistant steel, high heat reaches the beams 11, 14, 15 due to heat conduction and radiation, and often the supports 10, 12 are exposed to high heat. Damage to the mounting part may occur. If the attachment part between the beam and the column is damaged, it will be necessary to dismantle it and repair it. In this case, the refractory brick layer 9 will be dismantled, the attachment part will be repaired by welding, and then brickwork will be laid again. After this, the brickwork must be dried, which is very uneconomical, as the furnace must be shut down for several days.

The present invention solves the above-mentioned drawbacks, and eliminates the work of dismantling the transfer device, particularly the work of breaking down the firebrick layer 9, and facilitates the leveling work of the supports 5 and 7.

The present invention will be explained with reference to FIGS. 5 and 6, which show examples thereof.

In the above-mentioned conventional bar material transfer device for a heating furnace, the present invention provides that the support 10 for the fixed support 5 and the support 12 for the drive support 7 are both connected to a core metal 2 made of common steel.
1 and a sheath tube 22 made of heat-resistant cast steel containing a large amount of nickel and chromium, and the sheath tube 2
2 has a structure that can be removed by pulling upward from the core bar 21, these sheath cylinders 22 support the fixed support 5 or the drive support 7 at their upper ends, and these core bars 21 support the fixed beam 11 at their lower ends.
Alternatively, it has a structure in which it is vertically fixed to either of the drive beams 14.

Furthermore, if a structure is adopted in which a tube of heat insulating material is interposed between the core bar 21 and the sheath tube 22 of the column, the core bar 21, fixed beam 11, and drive beams 14 and 16 can be more effectively protected from high heat. .

The bar moving device for a heating furnace of the present invention can greatly reduce burnout and therefore the number of times the refractory brick layer 9, which is the hearth of the heating furnace, must be dismantled. By eliminating the need to re-lay bricks, it is possible to significantly reduce labor and improve the operating rate of the heating furnace.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are a plan sectional view, a side sectional view, and a cross-sectional view showing, in particular, a conventional bar transfer device in a conventional heating furnace for bar heat treatment. FIG. 4 shows the locus of movement of the column 12 that supports each support portion 8, 8, . . . of the drive support 7 and its specific point. FIG. 5 and FIG. 6 are both perspective views showing the structure of a support column used to support the fixed support and the drive support in the bar transfer device according to the present invention. 1 is a heating furnace, 2 is a fireproof wall, 3 is an inlet part, 4 is an outlet part, 5 is a fixed support, 6 is a support for a bar, 7 is a drive support, 8 is a support for a bar, 9 10 is a firebrick layer, 10 is a support for a fixed support, 11 is a fixed beam, 12 is a support for a drive support, 13 is a rectangular cylinder,
14 is a driving beam, 15 is an advancing/retracting beam, 21 is a core metal, and 22 is a sheath tube.

Claims (1)

[Scope of utility model registration request] A fixed support 5 made of heat-resistant steel has bar support parts 6, 6'... provided at predetermined intervals on its upper surface, and a bar on each of the support parts 6, 6'... of the fixed support is placed at a position immediately before it. Two rows or two rows of drive bearings 7 made of heat-resistant steel each having the same number of bearings 8, 8', etc., which operate to transfer the material to the bearings, extend from the inlet 3 to the outlet 4 in the heating furnace 1. In a heating furnace bar transfer device provided in several rows, each of the pillars 10 of the fixed support 5 and the pillar 12 of the drive support 7 is made up of a core bar 21 and a sheath cylinder 22 which is a cast product of heat-resistant steel. The sheath tube 22, which is a cast product of heat-resistant steel, has a structure that can be removed by pulling it upward from the core metal 21. A bar moving device for a heating furnace is provided in which the core metals 21 are vertically fixed to the fixed beam 11 or the drive beam 14 at their lower ends.