JPS6113542Y2 - - Google Patents

Description

[Detailed description of the invention] The invention consists of a freely movable trolley for loading materials to be heat treated,
The present invention relates to a heat insulating device for a heat treatment furnace for steel bars, etc., which is provided with a furnace body cover that opens downward and is movable up and down to cover the trolley when it is lowered.

Conventionally, the lower opening of the furnace body cover in this type of heat treatment furnace has not been insulated at all, and the heat inside the furnace body cover is absorbed from the extraction of the material after heat treatment to the charging of new material. A large amount of fuel was emitted from the lower opening, which increased fuel consumption accordingly.

In order to solve this problem, the present invention provides a heat insulating curtain at the lower opening of the furnace cover and opens and closes it by moving the trolley.
This is designed to prevent heat dissipation within the furnace cover as much as possible.

The present invention will be explained below with reference to embodiments shown in the drawings. Reference numeral 1 denotes a trolley that can freely travel along rails 2, and serves as a loading platform for the steel bars 3 during charging and extraction of materials to be heat treated, such as steel bars 3, and during heat treatment, and also constitutes the bottom wall of the furnace. Reference numeral 4 denotes a furnace cover with an open bottom, which is suspended from a pedestal (not shown) by a hanging fixture 5, and is movable up and down. A large number of burners 6, 6, . 8 is an exhaust gas port with a damper.

Conventionally, no heat insulating means was applied to the lower opening of the furnace cover 4, but in the present invention, a heat insulating curtain 9 is provided at the lower opening so as to be movable along the traveling direction of the cart 1. arranged horizontally. As the heat insulating curtain 9, for example, a heat insulating cloth containing stainless steel wire and pasted with aluminum foil is used, and the round steel 1 forming a moving rail provided on the channel steel 10 arranged on both sides of the furnace cover 4 in the longitudinal direction is used as the heat insulating curtain 9.
It is suspended by a large number of hanging rods 12, 12, . . . extending over one upper space. Moreover, it is in a folded state during heat treatment.

On the other hand, two curtain pull rods 13, 13 are erected at the rear position (left side in FIG. 1) of the trolley 1 when the trolley is pulled out. It is connected to the pull side end (right end in FIG. 1) of 9 via an engagement tool 14 having an engagement hole (numerical omitted).

In the heat insulating device configured in this way, during heat treatment, the furnace cover 4 is placed on the trolley 1 and the heat treatment is performed using heat from the burner 6, and when the heat treatment is completed, the furnace cover 4 is raised. At this time, the heat insulating curtain 9 also rises, and the engaging tool 14 also rises while being engaged with the pull rod 13. Thereafter, the trolley 1 is moved to the right in FIG. The heat insulating curtain 9 moves by that amount, and the furnace cover 4
Close the bottom opening. When the cart 1 reaches the transfer position, the lower opening of the furnace cover 4 is completely closed by the heat insulating curtain 9. Next, trolley 1
After the upper heat-treated material and the new heat-treated material are transferred, the cart 1 is moved to the left. Along with this,
The heat insulating curtain 9 is folded up and the lower opening of the furnace cover 4 is opened. When the cart 1 reaches a predetermined position, the furnace cover 4 is lowered and placed on the cart 1, and the next heat treatment is performed.

This generally takes about 20 minutes. Trolley 1
It takes a total of about 5 minutes to move back and forth, but the lower opening of the furnace cover 4 is closed by the heat insulating curtain 9 for at least about 15 minutes during the transfer time. Therefore, heat dissipation during that time is reliably prevented.

By the way, the minimum temperature inside the furnace just before extraction is 850℃.
In contrast, if no insulation measures were taken, the temperature would drop to 270°C, and the temperature would have to be raised from this 270°C in the next heat treatment step. However, in the above example, the temperature inside the furnace The temperature only decreased by 500℃, and the temperature increased by 500℃.
I was able to start from ℃. Therefore, the fuel consumption of the furnace was significantly reduced.

As described above, in the present invention, since the horizontal insulating curtain is movably provided at the lower opening of the furnace cover, it is possible to reliably prevent heat dissipation within the furnace cover during transfer of heat-treated materials. Furthermore, since the movement of the heat insulating curtain is driven by the trolley, an external power source is not required, and the structure is simple and economical.

[Brief explanation of the drawing]

Figure 1 is a front view showing the movement of the heat insulating curtain during the extraction or charging of heat-treated materials;
Figure 2 is a cross-sectional view showing the state when the furnace cover is raised, Figure 3 is a front view showing the positional relationship between the furnace cover and the trolley when the drawer is completed, and Figure 4 is an enlarged view of section A in Figure 3. Detailed view, FIG. 5 is an enlarged detailed view of part B in FIG. 2. 1... Cart, 3... Steel bar, 4... Furnace cover,
9...Insulating curtain, 13...Draw rod.

Claims (1)

[Scope of utility model registration request] In a heat treatment furnace equipped with a movable trolley for loading materials to be heat-treated and a furnace cover that is open at the bottom and can be raised and lowered to cover the trolley when lowered, a lower opening of the furnace cover is provided with a support along the running direction of the trolley. A movable insulating curtain is arranged horizontally, and the pull-side end of this insulating curtain is connected to the cart at a rear position when the cart is pulled out, and as the cart is pulled out and loaded, the insulating curtain is moved horizontally. A heat insulating device for a heat treatment furnace, characterized in that the lower opening of the furnace body cover is opened and closed by moving it.