JP2000219910A - Shifting furnace hearth type heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shifting furnace hearth type heating furnace provided with a roller lever type movable furnace hearth driving device, in which the maintenance is simple and the setting space is small. SOLUTION: In a shifting furnace hearth type heating furnace for executing heating while intermittently conveying a material supported on a fixed furnace hearth by moving the movable furnace hearth upward/downward and forward/ backward in a prescribed conveying stroke, a hydraulic driving type forward/ backward driving device 3 which drives a shifting table 1 fitted to the movable furnace hearth forward/backward, is arranged and also, two sets of vertical driving mechanisms 10 each of which is provided with rollers 5 supporting the shifting table 1 at the upper part and arranged with plural pieces of levers 6a-6c where intermediate parts are pivotally supported with the interval in the furnace longitudinal direction and which connects the lower part of each lever with a connecting rod 7, are parallel arranged in the furnace width direction. Further, a rotation-driving device which rotationally drives a supporting shaft 8 fitted to the intermediate part of one pair of levers 6b, 6b opposing to the furnace width direction and uses an electric motor as a prime mover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving hearth type heating furnace such as a walking beam type heating furnace and a walking hearth type heating furnace, and more particularly to an improvement of a driving device of a moving hearth type.

[0002]

2. Description of the Related Art A moving hearth type heating furnace such as a walking beam type heating furnace or a walking hearth type heating furnace has a movable hearth and a fixed hearth as a furnace transfer device.
By moving the movable hearth up and down and back and forth, the material supported on the fixed hearth is heated while being intermittently conveyed at a predetermined conveyance stroke.

[0003] As a driving device of the movable hearth,
As shown in FIGS. 3 and 4 as an example of a walking beam type heating furnace, there is a so-called roller lever type. In the drawing, reference numeral 1 denotes a movable table, and a movable beam (movable hearth) (not shown) is fixed to an upper end of a post 2 having a base fixed to the movable table. Reference numeral 3 denotes a front-rear drive unit composed of a hydraulic cylinder, the piston rod of which is connected to the moving table 1, and the cylinder unit is mounted on a foundation.

Reference numeral 30 denotes an up-down driving device, which has a roller 5 for supporting the moving table 1 at an upper portion and a lever 6 rotatably supported at an intermediate portion by a support shaft 8 at intervals in the furnace length direction. A plurality (three in this example) of drive mechanisms 33 each having a drive rod 31 connected to the lower end of each lever 6 by a pin and connected to a piston rod of a hydraulic cylinder 32 are arranged in the furnace width direction. And each hydraulic cylinder 32, 32 is connected to the tuning circuit 3
4 to a hydraulic power unit 35.

However, in the movable hearth drive device described above, since the vertical drive device 30 is of a hydraulic drive type, maintenance of hydraulic equipment such as the two hydraulic cylinders 32, 32 and the hydraulic power unit 35 is troublesome. In addition, there is a problem that a large space is required at the bottom of the furnace for installation of the above-described hydraulic devices and piping for connecting the hydraulic devices and the like.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and is provided with a movable hearth type heating apparatus equipped with a roller lever type movable hearth driving device which is easy to maintain and requires a small installation space. It is intended to provide a furnace.

[0007]

A moving hearth type heating furnace according to the present invention has a movable hearth and a fixed hearth as an in-furnace transfer device, and moves the movable hearth up and down and back and forth on the fixed hearth. In a moving hearth type heating furnace that performs heating while intermittently conveying a supported material at a predetermined conveying stroke, a hydraulically driven front-rear drive device that drives a moving table attached with the movable hearth back and forth is provided. An up-down drive mechanism comprising a plurality of levers having an intermediate portion and a plurality of levers supported at an upper portion provided at intervals in a furnace length direction and a lower portion of each of the levers connected by a connecting rod; Are provided side by side in the furnace width direction, and a rotary drive device using a motor as a motor is provided, which rotationally drives a spindle fixed to the intermediate portion of the pair of levers facing in the furnace width direction. And

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawings, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof will be omitted. Numerals 10 and 10 denote two vertical drive mechanisms arranged side by side in the furnace width direction so as to be able to support the moving table 1. A plurality of (three in this example) are arranged at intervals in the furnace length direction with rollers 5 at the top. A connecting rod 7 is pin-connected to the lower part of the provided levers 6a to 6c.
The support shaft 8 fixed to an intermediate portion of the shaft 6c is rotatably supported by a bearing 9 (not shown in FIG. 2) fixed on a foundation.

Reference numeral 20 denotes a rotary drive, which is a vertical drive mechanism 1
0 and 10 are driven in conjunction with each other, and an electric motor 22 composed of an inverter motor having an electromagnetic brake 21 for holding when stopped is used as a prime mover, and an output shaft of the electric motor 22 is input to a quadrature reducer 24 via a coupling 23. The output shafts 25, 25 of the orthogonal speed reducer 24 are connected to a pair of the levers 6b, 6b opposed to each other in the furnace width direction. The coupling 2 may be attached to the support shafts 8 and 8.
By connecting via the shafts 6, 26, the support shafts 8, 8 are driven to rotate in the same direction in conjunction with each other. The rotation of the lever 6b due to the rotation of the support shaft 8 is as follows.
The power is transmitted to other front and rear levers 6a and 6c via the connecting rod 7, the respective levers 6 rotate in conjunction with each other, and the six rollers 5 move up and down in conjunction with each other.

In the walking beam furnace having the above-structured walking beam driving device, the levers 6 of the vertical driving mechanisms 10, 10 are rotated by the rotary driving device 20 from the state shown by the solid line in FIG. 5 is rotated so that the center of 5 is located above the support shaft 8, and the movable table 1 is raised.
Forward drive, lowering drive of the moving table 1 by rotation drive in the opposite direction by the rotary drive device 20, front-rear drive device 3
By sequentially moving the carriage 1 backward
A rectangular movement of ascending, advancing, descending, and retreating is applied to the movable table 1 and thus to the movable beam, and by repeating this, the heated material supported on the fixed beam in the furnace (not shown) is intermittently advanced and conveyed in the furnace. Then, heat treatment is performed.

As described above, the movable table 1, and thus the movable beam, is driven up and down by the rotary drive unit 20 driven by the motor 22.
Therefore, maintenance is easier than that of the hydraulic type, and the installation space can be reduced because one rotary drive device 20 may be provided for the two vertical drive mechanisms 10, 10. Further, the vertical movement speed is controlled, for example, by reducing the vertical movement speed of the movable beam at the time of transfer in order to reduce the shock at the time of transferring the heated material onto the movable beam or the fixed beam. By controlling the rotation speed of the electric motor 22 while detecting the rotation angle and the rotation speed of the motor 8 with a pulse generator or the like,
And it can be done freely.

The present invention is not limited to the above example. For example, as the rotary drive unit 20, the support shafts 8, 8 of a pair of levers facing each other in the furnace width direction are connected by one intermediate shaft. A type other than the above example, such as a type in which the intermediate shaft is rotationally driven by the electric motor 22 via a reduction gear or the like, may be used. The present invention can also be applied to a walking hearth type heating furnace.

[0013]

As explained above, according to the present invention,
The roller lever type vertical drive mechanism that moves the moving table up and down is driven by a rotary drive device that uses an electric motor as a prime mover. Easy maintenance and small installation space.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a walking beam drive system of a walking beam furnace showing an example of an embodiment of the present invention.

FIG. 2 is a schematic plan view of the walking beam drive system of FIG.

FIG. 3 is a schematic plan view showing an example of a walking beam drive system of a conventional walking beam furnace.

FIG. 4 is a schematic plan view of the walking beam drive system shown in FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Moving stand, 3 ... Front-back driving device, 5 ... Roller, 6a ... Lever, 6b ... Lever, 6c ... Lever, 7 ... Connecting rod, 8 ...
Support shaft, 9: bearing, 10: vertical drive mechanism, 20: rotary drive device, 22: electric motor, 24: orthogonal reduction gear, 25: output shaft.

Claims (1)

[Claims] A movable hearth and a fixed hearth are provided as an in-furnace transfer device, and the material supported on the fixed hearth is intermittently transferred at a predetermined transfer stroke by moving the movable hearth up and down and back and forth. In a moving hearth type heating furnace that performs heating while heating,
In addition to providing a hydraulically driven front-rear drive device for driving the movable table to which the movable hearth is attached in the longitudinal direction, a roller supporting the movable table is provided at an upper portion, and a lever supported at an intermediate portion is spaced apart in the furnace length direction. In the furnace width direction, two vertical drive mechanisms, each of which has a plurality of lower levers connected by a connecting rod, are arranged side by side in the furnace width direction, and are provided at the intermediate portion of the pair of levers facing each other in the furnace width direction. A moving hearth type heating furnace, comprising: a rotary drive device that drives a fixed support shaft to rotate and uses an electric motor as a prime mover.