JPH0526581A - Heating furnace - Google Patents

Abstract

PURPOSE:To improve the degree of freedom in the arrangement of the annexed facilities such as a conveyer device and the like of a rotary heating furnace, heating a work while retaining and rotating the same. CONSTITUTION:A heating furnace is provided with an annular rotary hearth 5, turned in a furnace shell 4 into a predetermined direction in a horizontal plane, and a central hearth 6, provided in the center of the rotary hearth 5. A charging port 12 for charging works onto the rotary hearth 5 from the outside of the furnace is formed on the side wall of the furnace shell 4. When the rotary hearth 5 is turned by a predetermined angle while putting the work charged from the charging port 12 thereon, the work is shifted from the rotary hearth 5 onto the central hearth 6 by a shifting means and the central hearth 6 is descended, then, the work is taken out of the furnace from the hearth 6 by a take-out means.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heating furnace used for heating forging billets and the like.

[0002]

2. Description of the Related Art As a rotary heating furnace for warm forging, there is known a rotary heating furnace in which a hearth is intermittently rotated and a work is heated while being fed from an inlet to an outlet.
With such a configuration, there is an advantage that it is possible to easily control the residence time of the work in the furnace and to make the entire furnace compact. For example, FIG. 6 and FIG. 7 show an example thereof, and this heating furnace 1 ′ is provided with an annular rotary hearth 5 ′ that rotates in a horizontal plane, and a workpiece is placed from the charging port 12 ′ onto the rotary hearth 5 ′. Is charged, the rotary hearth 5'on which the work is placed makes almost one rotation, and the work is heated to a predetermined temperature (550-6
It is heated to about 00 ° C). The heated work is taken out of the furnace through the take-out port 24 '.

[0003]

In the conventional rotary heating furnace described above, the work inlet 12 'and the work outlet 24' are provided on the outer wall of the furnace shell 4'at the same height as the hearth surface. In order to increase the amount of work retained in the furnace, it was necessary to bring these inlets and outlets close to each other. For this reason, the carrier device 40 that feeds the unheated work to the loading port 12 ′ and the carrier device 41 that takes out the heated work from the outlet 24 ′ and sends it to the next process are likely to interfere with each other, and there is a restriction on their arrangement. there were.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, in the heating furnace according to the present invention, an annular rotary hearth that rotates in a predetermined direction in a horizontal plane is provided inside the furnace shell in which a work inlet is formed in a side wall portion, and a central portion of the rotary hearth. It is characterized in that a central hearth that can be raised and lowered is provided in the hole formed in the.

[0005]

[Function] The work charged from the charging port is heated while rotating together with the hearth. The heated work is transferred onto the central hearth provided at the core of the rotary hearth, and then the central hearth is lowered to take out the work at that position. Since the loading port and the loading port can be provided at different heights and separated from each other, the degree of freedom in their arrangement is increased.

[0006]

1 is a side sectional view showing a developed embodiment of the present invention, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG.
Is also a BB view. This heating furnace 1 has a ceiling wall 2
A cylindrical furnace shell 4 having an upper part that is closed and a side wall 3 is provided, and an annular rotary hearth 5 and an elevating central furnace hearth 6 are provided therein. The central part 2a of the ceiling wall 2 of the furnace shell is low and the outer peripheral part 2b is high, and a donut-shaped heating space 7 is formed above the rotary hearth 3. The heating space 7 communicates with a furnace core space 8 above the central hearth 6. An appropriate number (4 in the illustrated example) of burners 10, ... And ducts 11 are attached to the outer peripheral portion 2b of the ceiling wall, and the side wall 3
A work loading port 12 is provided at an appropriate position. As for the positional relationship, as shown in FIG. 1, it is preferable that the burners 10, ... Are provided on the opposite side of the charging port 12 with a slight offset and the duct 11 is provided on the same side as the charging port 12.

The annular rotary hearth 5 having a hole in the center is
The rail 14 is rotatably supported in a horizontal plane, and is intermittently fed at a predetermined timing in a certain direction (C direction) by using an appropriate driving means. In the illustrated example, a mechanism (not shown) that is a combination of hydraulic cylinders is used as the driving means. The heating furnace 1 is for heating a round bar-shaped billet as shown in FIG. 5, and the hearth plate constituting the floor surface portion of the rotary hearth 5 is shown in FIG.
As shown in Fig. 5, a required number (16 in the illustrated example) of hearth plate pieces 16, each having a V-shaped groove 15 suitable for holding a billet, are combined, and a work holding groove (V-shaped groove) 15 is provided on the upper surface.
Are radially formed at equal intervals.

The central hearth 6 is a base 1 that is vertically movable.
8 is attached to the base so as to be rotatable within a range of a predetermined angle. In the figure, 19 is a hydraulic cylinder for moving up and down the base 18, and 20 is an air cylinder for rotating the central hearth 6 with respect to the base 18. The work holding groove 2 having a V-shaped cross section is also formed on the floor plate constituting the floor surface portion of the central hearth 6.
1 is formed. The ascending / descending regions of the central hearth 6 and the base 18 are covered with a case 23, and a work take-out port 24 and an emergency payout port 25 are provided on the side surface of the case. Work guides 27 and 28 are installed outside the work take-out opening 24 and the emergency pay-out opening 25.

Further, the heating furnace 1 includes a transfer pusher 30 as transfer means for transferring a billet (hereinafter referred to as a work) from the rotary hearth to the central hearth, and a work from the central hearth to the outside of the furnace. A take-out pusher 31 as a take-out means for taking out the work is provided, and an emergency pusher 32 for taking out the work from the central hearth to the outside of the furnace in an emergency. Each pusher has a head attached to the end surface of the work at the tip of the rod of the hydraulic cylinder, and the transfer pusher 30 is provided at a predetermined angle position in the rotating direction of the rotary hearth 5 from the loading port 12 and is taken out. The pusher 31 and the emergency pusher 32 are provided so as to correspond to the work take-out port 24 and the emergency payout port 25, respectively.

Reference numeral 34 in the figure is a loading conveyor in which a pair of chains 35, 35 are provided with V-shaped conveying lugs 36, ... In side view at regular intervals, and 37 is each of the pushers 30, 31, 3 described above.
It is a charging pusher having the same structure as that of No. 2. Further, 38 is a conveyor for sending the heated work to the next process.

The work W supplied to the starting end portion 34a of the charging conveyor 34 is carried to the terminal end portion 34b located on the front surface of the charging inlet 12 by the charging conveyor. Subsequently, the loading pusher 37 is extended and the work W on the terminal end portion 34b is pushed into the work holding groove 15 waiting at the loading position. A shutter 39 that opens and closes in synchronization with the loading pusher 37 is preferably provided at the loading port 12 so that the loading port 12 is closed except when the work is loaded.
When the charging of the work is completed, the rotary hearth 5 is intermittently rotated by the pitch of the work holding groove. The time required for the rotary hearth 5 to rotate from the charging position to the transfer position where the transfer pusher 30 is provided is about 10 minutes, although it varies slightly depending on the size of the work, the target temperature and the like. When the work W moves between the transfer positions, the transfer pusher 30 is extended and the work W held in the work holding groove 15 of the rotary hearth is at the same raising position as the rotary hearth. 6 is transferred to the work holding groove 21. Then, the central hearth 6 descends to the lowered position, and further swivels to the take-out position, and subsequently the take-out pusher 32
Is extended and the work W in the work holding groove 21 is guided by the guide 2
Extruded through 7 onto conveyor 38. Further, when a trouble occurs in the next process or the conveyor 38, when the central hearth 6 is lowered, the emergency pusher 32 is extended and the work W is taken out of the furnace through the emergency outlet 25.

In this embodiment, the central hearth is arranged so as to move up and down with respect to the rotary hearth, and the work is smoothly taken out of the furnace. However, the central hearth does not necessarily have to be lifted. Alternatively, the work may be taken out of the furnace from the central hearth by any other suitable method.

As described above, in the heating furnace according to the present invention, the central hearth is provided in the hole formed in the core of the rotary hearth, and the work after heating is removed from the rotary hearth. Since it is once transferred to the central hearth and taken out of the hearth from the hearth, the work loading and unloading ports can be provided at different heights and at different distances. It has become possible to arrange conveyors for use relatively freely.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a developed developing furnace according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

3 is a sectional view taken along line BB in FIG.

FIG. 4 is a perspective view of a hearth plate piece.

FIG. 5 is a perspective view of a billet.

FIG. 6 is a plan sectional view of a conventional heating furnace.

FIG. 7 is a side sectional view of the heating furnace shown in FIG.

[Explanation of symbols]

 1 Heating Furnace 4 Furnace Shell 5 Rotating Hearth 6 Central Hearth 12 Charging Inlet 24 Outlet 25 Emergency Ejection 30 Transfer Pusher (Transfer Means) 31 Ejection Pusher (Ejection Means) 32 Emergency Pusher

Claims (1)

Claim: What is claimed is: 1. An annular rotary hearth that rotates in a predetermined direction in a horizontal plane is provided inside a furnace shell having a work inlet formed in a side wall, and the center of the rotary hearth is also provided. A heating furnace characterized in that a central hearth that can be raised and lowered is provided in a hole portion formed in the section.