JPS6233281A - Continuous heating furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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) As a conventional continuous heating furnace of this type, for example, as shown in FIGS. 6 and 7, a trolley 32 running on a track 33 is used.
After placing the material to be heated on the top in front of the furnace, the heating furnace 31
The entrance door 34 of the heating furnace 31 is opened and the carts are pushed into the heating furnace one by one. After a predetermined heating time has elapsed, the rear exit door 35 of the heating furnace 31 is opened.
The carriage 32 is extracted from the furnace by being opened, and the material to be heated is transported to the next process and removed.

Then, the empty truck 32 is placed on the rail 3j outside the furnace.
It is placed on a rotary table 36 provided at the end of the tube, its direction is changed, and it is sent on another rail 37 to the next rotary table 38, where the running direction is changed and heated. Furnace 3
It travels on a rail 39 laid parallel to 1 until it reaches the next turntable 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, waits to be pushed into the furnace, and then moves from the rotary table 42 to the rotary table 42 in front of the furnace. It is pushed out and waits for the material to be heated to be placed on it, and after being placed, it is pushed into the furnace as described above.

However, with such a structure, the heating furnace is a straight furnace, and the trolley passes through it one way, resulting in a very long furnace, which limits the 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 during the time when the cart 52 that has exited the furnace returns to the heated material insertion port. A sand seal 45 is installed between the heating chamber and the bogie JZ running on the rails to prevent heat from escaping from inside the furnace, but this results in a loss of thermal energy due to sand discharge and requires sand replenishment. There were problems such as.

(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) To explain the embodiments of the present invention with reference to the drawings, (1) is a heating furnace main body, which is formed in a rectangular shape with a plane long in the front and back direction, and is spaced at regular intervals in the length direction on both sides of the inside. Each roller 2a, 2a...2a; 3a, 3a...
3a is rotatably supported, the group of rollers 2a on the negative side is used as a feed roller group (2), and the group of rollers 3a on the other side is used as a group of feed rollers (3).
31 are arranged in parallel in the length direction.

(4) is a movable trolley installed 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), and the rail (4) installed on the bottom of the furnace.
5) It runs on the top in the left-right direction, and several rollers (6) are rotatably supported on the top surface facing in the same direction and at the same height position as the rollers 2a and 3a.

(7) is a movable trolley disposed inside the rear end of the heating furnace body (1) between the end of the feed roller group (2) and the start end of the feed roller group (3), and is similar to the movable trolley (4). In addition, several rollers (9) running in the left-right direction on the rail (8) and pivotally supported on the upper surface thereof are provided at the same height position as the roller groups (2) and (3).

Reference numerals 11 and 12 are material insertion and removal ports opened in the ceiling surface of the front end of the heating furnace body (1);
Doors 15 and 16 respectively disposed on the lower surfaces of door opening/closing carts 13 and 14 that run along the upper surface in the length direction are connected to cylinders 17 and 18.
It is designed to open and close by operating the button.

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 able to run freely in the length direction of the heating furnace body (1) from above the heating furnace body (1) to above the heated material conveyor 19.
The heated material W on the heating furnace body (1) is transferred to the heated material insertion port 11 of the heating furnace main body (1), and the heated material W is transferred from the extraction port 12 onto the conveyor 19.

Reference numeral 21 denotes a conveyor table plate on which the material to be heated W is placed, and is connected to the heating furnace main body (
The roller groups (2) (3) in 1) and the mobile cart (4)
1 (supported and transferred on 71).

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

The insertion port 11 is opened by a door opening/closing cart 13, and the material to be heated W, which is held by the overhead crane 20, is inserted into the furnace through the insertion port 11 and transported on a movable cart (4) below the insertion port. It is placed on the base plate 21.

Thereafter, the overhead crane 20 is returned to its original position, and the door opening/closing cart 13 is moved to the insertion slot 11, and the door 15 is moved down by the operation of the cylinder 17.
Close 1.

Transport platform plate 21 on the movable trolley (4) on which the material to be heated W is placed
is pushed by a pusher (not shown) at a predetermined pitch toward the rear as indicated by the arrow in FIG.
2) While the mobile cart (4) is placed on the extraction port 12
As described below, the carrier plate 21 on which the material to be heated that has been heated in the furnace is placed is loaded, and the carrier plate 21 after the material to be heated is removed by a crane is transferred. Then, it returns to the lower part of the insertion port 11 and receives the next material to be heated. Note that the movement of the moving carriage (4) and the moving carriage (7) arranged at the rear in the left and right direction is performed by a pusher method (not shown) using cylinders.

In this way, the carrier plate 2 on the moving trolley (4) is
The material to be heated W is placed on 1 and pushed onto the roller group (2) one after another, and the conveyor plate 21 that has reached the rear end of the furnace is transferred onto the rear movable trolley (7). After the movable cart (7) is moved to the starting end side of the feed-out roller group (3) by a pusher (not shown), the base plate 21 on the cart is moved onto the feed-out roller group (3) by a pusher (not shown). It will be transferred to.

The rear moving trolley (7
) is sequentially transferred to the feed-out roller group (3) and pushed forward, and during this time the heated material W is heated and raised in temperature, and is transferred to the movable cart (4) of the extraction port 12.
) to reach the top.

The heated material W on the plywood placed on this moving trolley (4)
The door 16 is suspended by the operation of a cylinder 18 which has the extraction port 12 installed on the door opening/closing platform 4, is opened by the door opening/closing trolley I4, is lifted out by the overhead crane 20, and is placed on the conveyor 19. and then transferred to the next process.

After the heated material W is extracted, the door 16 is closed by the door opening/closing trolley 14, and the empty carrier plate 21 is loaded on the moving trolley (4) and pushed toward the insertion port 11 side by a pusher. Then prepare for loading the next heated material.

3 to 5 show the support structure of 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 FIG. is roller 2
The support bearings 23 of a and 3a are installed outside the heating furnace. In this case, it becomes possible to forcibly transfer the conveyor plate 21 by driving the roller groups (2) and (3) from the outside. In Fig. 5, when the load applied to the rollers 2a and 3a is large, a pair of supports are mounted on the rollers 24 and 24 to prevent the rollers 2as and 3a from bending downward.
, 3a are supported.

(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 conveyor plate.Furthermore, since it does not use a sand seal like in the past, there is no loss of thermal energy due to heated sand discharge and sand replenishment. By eliminating such complicated operations, it is possible to heat the material to be heated with high thermal efficiency, and it is also possible to improve work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view;
FIG. 2 is a vertical side view, FIGS. 3 to 5 are enlarged sectional views showing modified examples of the bearing section, FIG. 6 is a plan view of the conventional device, and FIG.
The figure is its vertical front view. (1)...Heating furnace main body, (2)...Feeding roller group, (3)...Feeding roller group, (4) (71.
...Moving cart, 10...Transportation platform plate, 11...Insertion port, 12...Extraction port, 15 and 16...Door.

Claims (1)

[Claims] A group of rollers for feeding the material to be heated is placed on one side of the heating furnace body.
A group of feed-out 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 so that the heated material conveying table placed on the roller group is moved around. A heating material insertion port into the feed roller group and a heating material extraction port from the delivery roller group are provided at one end of the heating furnace body, and these insertion ports and extraction ports are configured to be openable and closable with a door. A continuous heating furnace characterized by: