JPH022074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a heating furnace in which a material to be heated is sequentially supplied to a conveyance table within the furnace and subjected to continuous heat treatment within the furnace.

(Prior art and its problems) Conventional continuous heating furnaces of this type include, for example,
As shown in FIGS. 6 and 7, after the material to be heated is placed in front of the furnace on a cart 32 running on a track 33, the entrance door 34 of the heating furnace 31 is opened and the cart 32 is placed inside the heating furnace. are successively pushed in, and after a predetermined heating time has elapsed, the rear exit door 35 of the heating furnace 31 is opened, the cart 32 is extracted from the furnace, and the heated material is transported to the next process and removed.

The empty cart 32 is then placed on a rotating table 36 provided at the end of the rail 33 outside the furnace, and its direction is changed and the cart 32 is moved on another rail 37 to the next rotating table 38. The rotating table 38 changes the direction of travel, and travels on a rail 39 laid parallel to the heating furnace 31 to the next rotating table 40. The cart 32 is turned to the front side of the furnace by the rotary table 40 and is conveyed on the rails 41 to the rotary table 42 in front of the furnace, where it waits to be pushed into the furnace.
It is pushed out from the rotary table 42 and waits for the material to be heated to be placed thereon, and after being placed thereon, it is pushed into the furnace as described above.

However, with this structure, the heating furnace is a straight furnace with a trolley passing through it in one direction, resulting in a very long furnace with limited installation space. Since the material insertion and extraction positions are provided at the front and rear of the furnace body, a large amount of energy is released while the trolley 32 returns from the furnace to the heating material insertion port, and the heating chamber of the heating furnace 31 A sand seal 4 is installed between the
3. Although heat release from the inside of the furnace is prevented, there are problems such as a loss of thermal energy due to sand discharge and the need to replenish sand.

(Object of the Invention) The present invention has been made in view of these problems, and it eliminates the loss of thermal energy in the furnace due to the conveyance table, eliminates the need for a sand seal, and solves the various problems caused by the sand seal. In addition, the present invention provides a continuous heating furnace with a reduced furnace length and improved thermal efficiency.

(Structure of the Invention) In order to achieve the above object, the continuous heating furnace of the present invention has a group of feed rollers for the material to be heated on one side of the heating furnace body and a group of feed rollers on the other side arranged in parallel. At the same time, a movable cart is interposed between the front and rear ends of these roller groups so that the heated material conveying table placed on the roller group can be moved around. An opening for the material to be heated into the group and an outlet for the extraction of the material from the feed roller group are provided, and these insertion ports and extraction ports can be opened and closed with doors, and the conveyor table for the material to be heated is connected to the furnace. The heating furnace is characterized in that the material to be heated is circulated within the heating furnace, and the material to be heated is inserted and extracted at one end of the heating furnace.

(Description of Embodiments) Embodiments of the present invention will be explained with reference to the drawings.
is a heating furnace main body, which is formed into a rectangular shape whose plane is long in the front-rear direction, and rollers 2a, 2a...2a; 3a, 3a,
3a...3a are rotatably supported, and the roller groups 2a on one side are set as a feeding roller group 2, and the rollers 3a group on the other side are set as a feeding roller group 3, and these roller groups 2 and 3 are arranged in the longitudinal direction. are placed side by side.

Reference numeral 4 denotes a movable cart disposed inside the front end of the heating furnace body 1 between the start end of the feed roller group 2 and the end end of the feed roller group 3, which runs in the left-right direction on rails 5 laid on the bottom surface of the furnace. Several rollers 6 are rotatably supported on the upper surface thereof, facing in the same direction and at the same height position as the rollers 2a and 3a.

Reference numeral 7 denotes a movable trolley disposed inside the rear end of the continuous heating furnace 1 between the terminal end of the feed roller group 2 and the start end of the feed roller group 3. Like the movable trolley 4, it runs in the left-right direction on the rails 8. Several rollers 9, which are pivotally supported on the upper surface thereof, are provided at the same height as the rollers 2 and 3.

Reference numerals 11 and 12 denote heated material insertion and removal ports which are opened in the ceiling surface of the front end of the heating furnace main body 1, and are provided on the lower surface of the door opening/closing carts 13 and 14 that run longitudinally on the upper surface of the heating furnace main body 1. Doors 15 and 16 are opened and closed by operating cylinders 17 and 18, respectively.

Reference numeral 19 denotes a conveyor for conveying materials to be heated, which is disposed in the left-right direction close to the front of the heating furnace main body 1.

Reference numeral 20 denotes an overhead crane that is disposed so as to be movable in the length direction of the heating furnace main body 1 from above the heating furnace main body 1 to above the heating material transport conveyor 19, and heats the heating material W on the transport conveyor 19. The material to be heated W is transferred onto the conveyor 19 from the material insertion port 11 of the furnace body 1 and from the extraction port 12.

Reference numeral 21 denotes a conveyor table plate on which the material to be heated W is placed, and is supported on the roller groups 2 and 3 and the movable carts 4 and 7 in the heating furnace main body 1 for transfer.

To explain the operating state of the continuous heating furnace configured as above, the material to be heated W conveyed by the front conveyor 19 is transferred to the insertion port 11 of the heating furnace main body 1 by the overhead crane 20. Ru.

The insertion port 11 is opened by the door opening/closing trolley 13 and the heated material W held by the overhead crane 20 is inserted into the insertion port 11.
is inserted into the furnace through the insertion port 11 and placed on the carrier plate 21 on the movable cart 4 below the insertion port.

Thereafter, the overhead crane 20 is returned to its original position, and the door opening/closing cart 13 is driven to the insertion port 11, and the door 15 is moved down by the operation of the cylinder 17, thereby closing the insertion port 11.

The conveyor plate 21 on the movable cart 4 on which the material to be heated W is placed is pushed by a pusher (not shown) a predetermined pitch backward as indicated by the arrow in FIG. 1, and is placed on the feed roller group 2. Meanwhile, the mobile cart 4 moves below the extraction port 12, loads the carrier plate 21 on which the material to be heated heated in the furnace is placed, as will be described later, and uses a crane to remove the material to be heated. The conveyor plate 21 after being taken out is transferred and returned to the position below the insertion port 11 to receive the next material to be heated. The movement of the movable cart 4 and the movable cart 7 disposed at the rear in the left-right direction is performed by a pusher method (not shown) using a cylinder.

In this way, the material to be heated W is placed on the conveyor plate 21 on the movable cart 4 at regular intervals, and the roller group 2
The carrier plate 21 that has been pushed upward and has reached the rear end of the furnace is transferred onto the rear moving carriage 7, and the moving carriage 7 is moved to the starting end side of the feed roller group 3 by a pusher (not shown). After moving, the base plate 21 on the truck is transferred onto the feed-out roller group 3 by a pusher (not shown).

In accordance with a predetermined heating time of the heated material W, the heated material mounting base plate 21 from the rear movable trolley 7 is sequentially transferred to the feeding roller group 3 and pushed forward,
During this time, the material to be heated W is heated, its temperature rises, and reaches the top of the moving cart 4 at the extraction port 12.

The heated material W on the base plate placed on the movable trolley 4 suspends the door 16 by operating a cylinder 18 with an extraction port 12 mounted on the door opening/closing trolley 14, and opens the door 16 by the door opening/closing trolley 14. overhead crane 20
is lifted out, placed on the conveyor 19, and transported to the next process.

After extraction of the heated material W, which has been heated to an elevated temperature, the door 16 is closed using the door opening/closing cart 14, and the empty carrier plate 21 is loaded onto the moving cart 4, which is then pushed to the insertion port 11 side by a pusher. Prepare for loading of materials to be heated.

3 to 5 show the support structure for the roller groups 2 and 3. FIG. 3 shows a structure in which heat-resistant rolling bearings 22 are provided in the rollers 2a and 3a, and
The figure shows the support bearings 23 of the rollers 2a, 3a installed outside the heating furnace. In this case, it becomes possible to drive the roller groups 2 and 3 from the outside to forcibly transfer the conveyance table plate 21. FIG. 5 shows rollers 2a,
The rollers 2a, 3a are supported by a pair of receiving rollers 24, 24 in order to prevent these rollers 2a, 3a from bending downward when the load applied to the roller 3a is large.

(Effects of the Invention) As described above, according to the continuous heating furnace of the present invention, a group of feed rollers for the material to be heated is arranged in parallel on one side of the heating furnace main body, and a group of feed rollers on the other side are arranged in parallel. A movable cart is interposed between the front and rear ends of these roller groups so that the heated material conveyor placed on the roller group can be moved around, so that the heated material can be placed at one end of the heating furnace body. It is possible to heat the furnace while reciprocating in a U-shape from the insertion port to the extraction port, which allows the installation area of the furnace body to be reduced, and the transfer plate on which the material to be heated is placed can be placed inside the furnace. Since it is moved over the roller group, there is no loss of thermal energy from the moving table plate, and since it does not use a sand seal like in the past, there is no loss of thermal energy due to ejection of heated sand, sand replenishment, etc. This eliminates the complicated work of heating the material to be heated with high thermal efficiency, and improves work efficiency.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a plan view, FIG. 2 is a longitudinal side view, FIGS. 3 to 5 are enlarged sectional views showing modified examples of the bearing section, and FIG. A plan view of the conventional device, and FIG. 7 is a longitudinal sectional front view thereof. 1...Heating furnace main body, 2...Feeding roller group,
3... Delivery roller group, 4, 7... Moving trolley,
10...Transportation plate, 11...Insertion port, 12...Extraction port, 15 and 16...Door.

Claims (1)

[Claims] 1 A group of feed rollers for the material to be heated is arranged in parallel on one side of the heating furnace main body, and a group of feed rollers is arranged in parallel on the other side, and a movable cart is interposed between the front and rear ends of these roller groups to form a roller group. The material to be heated conveyor table placed thereon is moved in a circular manner, and one end of the heating furnace main body is provided with an insertion port for the material to be heated into the feed roller group and an outlet for the material to be heated from the feed roller group. A continuous heating furnace characterized in that the insertion port and the extraction port can be opened and closed with a door.