JPH0454214Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an induction heating device for continuously heating billets and the like.

B. Summary of the invention The invention is an induction heating device in which a conveyor, a group of pinch rolls, and an induction heating furnace are sequentially arranged along a conveyance line for conveying objects to be heated. At the same time, a chain is connected to a set of sprockets, the end of the push rod is connected to the chain, and a guide tube that supports and slidably guides the lower surface of the push rod is connected to the tip of the arm. By providing the base ends of the pair of arms so that they can be rotated so that they can move forward and backward directly above the conveyor,
This makes it possible to easily perform trial heating of an object to be heated or heating the last object to be heated in continuous heating.

C. Conventional technology Object to be heated such as billet (hereinafter referred to as work)
A heating device is used to heat the. The heating device used is one that performs induction heating while transporting the workpiece.A pinch roll type heating device is used that transports the workpiece along a linear transport line and feeds it sequentially into the heating furnace using pinch rolls. There is also a push rod type, in which the workpiece is conveyed by rolling it, for example, in a direction perpendicular to the axis of the heating furnace, just before the heating furnace, and the push rod is reciprocated to send the workpieces one by one into the heating furnace.

With a push rod type heating device, the amount of push rod movement and takt time must be changed each time the length of the workpiece changes. In addition, the workpieces are transported into the heating furnace intermittently, and measures must be taken to prevent the push rod itself from heating. On the other hand, the pinch roll type heating device is excellent in that it does not need to be changed even if the length of the workpiece changes, and can convey the workpiece continuously at a constant speed.

The conventional pinch roll type induction heating device has been replaced with a third one.
As shown in the figure. As shown in the figure, along the conveyance line there is a conveyor 4 and a cylindrical skid rail 6 inside.
An induction heating type heating furnace 1 equipped with
A pinch roll group 5 consisting of three pinch rolls is provided between the conveyor 4 and the heating furnace 1 in this example. Chutes 2 and 8 are connected to the conveyor 4 and the heating furnace 1. Note that 7 is a major roll.

Next, the operation of such an induction heating device will be briefly explained. The workpiece 3 slides on the chute 2, descends onto the conveyor 4, is conveyed by the conveyor 4 in the direction of the heating furnace 1, and is further bitten by a group of pinch rolls 5, so that it is continuously moved into the heating furnace 1. sent to. These works 3 are pushed by other connected works 3 to move inside the heating furnace 1 and are heated. However, work 3 near the end and work 3 for trial heating
Since there is no other workpiece 3 connected, it will not be transported.
In such a case, push the workpiece 3 from behind by pushing out the dummy workpiece with the pinch roll group 5, or push the backside of the workpiece 3 with a push rod to move it inside the heating furnace 1 and complete the heating. I'm letting you do it. The heated workpiece 3 descends through the chute 8 and moves to the next process.

D Problems to be solved by the invention However, when using dummy workpieces so that they can be pushed out by a group of pinch rolls, dummy workpieces with different dimensions must be prepared for each workpiece with a different outer diameter or length. This becomes complicated and the power input to the dummy work is wasted. On the other hand, when using a push rod, it is usually stored in a place that does not interfere with workpiece transportation, taken out and used only when necessary, and must be returned to its original place after use, making it difficult to handle and operate. This is troublesome, and in particular, the push rod after heating the workpiece 3 while pushing it into the heating furnace is dangerous because of its high temperature.

Therefore, an object of the present invention is to provide an induction heating device that solves this problem.

E. Means for solving the problem In order to achieve the above object, the present invention is constructed as follows.

A pair of arms are arranged at positions apart from each other along the conveyance line and are connected by a connecting member, and a rotatable sprocket is provided at the tip of each arm, and a first driving means is connected to one sprocket. do. Then, a chain is hung across both sprockets, and the end of a long push rod facing away from the heating furnace is connected to the bottom of the chain, and the push rod is transported by supporting the lower surface of the push rod. The ends of the guide tubes for movably guiding along the line are fixed to the tips of the respective arms or to the ends of the connecting members. The push rod supported on the guide gutter can move forward and backward directly above the conveyor.
The base end of each arm is rotatably provided, and a second driving means is connected to the arm.

F Action Test heating the workpiece or the last 2~
When heating three workpieces, after the workpieces have passed on the conveyor, the push rod, which is in a standby position away from the conveyor, is moved to the conveyor by rotating the pair of arms using the second drive means. Move it directly above. After this, it is better to stop the rotation of the conveyor and pinch roll group. Immediately, the first drive means rotates the chain by a certain amount via the sprocket, and the push rod connected to the chain on the side opposite to the heating furnace is moved a certain distance along the guide channel directly above the conveyor, thereby causing the inside of the heating furnace to rotate. The workpiece is heated by moving it at a constant speed. By making the outside diameter of the push rod sufficiently small within the allowable range for strength, etc., the outside diameter of the push rod can be made smaller than the outside diameter of most normal workpieces, so the push rod can be It can be passed between the pinch roll groups without resistance. When the workpiece leaves the heating furnace, the first driving means is rotated in the opposite direction by the same number of rotations as above, and when the entire push rod is placed on the guide groove, the second driving means is used to rotate the pair of arms in the opposite direction. and return it to the standby position.

G. Embodiments Hereinafter, the present invention will be described based on embodiments shown in the drawings. Note that this embodiment is a partial improvement of the conventional induction heating device, so the same parts are given the same reference numerals and the explanation thereof will be omitted, and only the different parts will be explained.

The present invention is characterized in that the workpiece is sent out by moving only the push rod without moving or adjusting the conveyor or pinch roll group.

As shown in FIG. 1, a frame 12 is attached to the base 10 along the conveyance line, and the conveyor belt 11 of the conveyor 4 driven by a motor (not shown) is hung on a roll (not shown) on the frame 12. It is provided. A pair of guides 13a and 13b are provided on the conveyor belt 11 to guide the work 3 on the conveyor belt 11 so that it does not fall, and a mechanism for adjusting the mutual spacing is provided at both ends of the guides 13a and 13b. It is being That is, a threaded shaft 15 with a right-handed thread and a left-handed thread formed on one end and the other end, guides 13a and 13b screwed together on one end and the other end, and a pulley 14 attached to one end is attached to the frame 12. A belt (not shown) is stretched around both pulleys 14, and a handle 16 is fixed to the other end of one screw shaft 15.

The sides of both ends of the conveyor 4 are bases 17a and 17b.
is fixedly provided on the base 10, and the base 1
Arms 18a and 18b are arranged above 7a and 17b. The arms 18a and 18b are connected by a connecting member 19, and rotating shafts 21a and 21b are rotatably attached to the upper part of the arms 18a and 18b via a pair of bearings 20a and 20b, respectively. A rotating shaft 21 located at the tip of the arms 18a, 18b
sprockets 22a, 22 at one end of a, 21b
b is fixed, and a chain 23 is wound around the sprockets 22a and 22b. and,
A motor 24 as a first drive means is connected to the other end of one shaft 21a. That is, the connecting member 1
The output shaft of a motor 24 mounted on the motor 9 is connected to the rotating shaft 21a via a reducer 25, a sprocket 33, a chain 26, and a sprocket 34. At the bottom of the chain 23, the end of the push rod 27 extending in the direction of the chain 23 on the side opposite to the heating furnace is connected to the connecting member 2.
A guide tube 29 having a substantially J-shaped cross section is connected to the push rod 27 via a guide tube 29 that slidably supports and guides the lower surface of the push rod 27.
is attached in conjunction with. The outer diameter of the push rod 27 is made as small as possible within the allowable range for strength and other reasons. Arm 18 configured in this way
The proximal ends of a, 18b are connected to stays 30a, 30b fixed to bases 17a, 17b with pins 31a, 3.
It is rotatably attached via 1b. Then, the arm 1 is centered around the pins 31a and 31b.
In order to rotate 8a and 18b, the base 17
Rods of hydraulic cylinders 32a and 32b as second drive means rotatably attached to arms 18a and 17b are rotatably coupled to intermediate positions of arms 18a and 18b.

This induction heating device includes a main switch (not shown) for moving the conveyor 4 and the pinch roll group 5 (see FIG. 3), and a push rod 27 to move workpieces for trial heating into the heating furnace. An auxiliary switch (not shown) is provided to operate a control means (not shown) programmed to automatically carry out a series of operations to return the push rod 27 to its original position after being moved within (see Figure 3). There is. The operation of this control means will be explained together with the operation of the induction heating device described below.

The operation of the induction heating device will be explained below. When the workpiece 3 that has descended on the chute 2 (see FIG. 3) is placed on the conveyor belt 11, the workpiece 3 is guided by the guides 13a and 13b and placed on the pinch roll group 5.
(see FIG. 3), is caught by the pinch roll group 5, and pushed out into the heating furnace 1 (see FIG. 3). The workpiece 3 in the heating furnace 1 is pushed by the following workpiece 3 and moves within the heating furnace 1, is heated, descends the chute 8 (see FIG. 3), and moves to the next process (pressing, etc.).

Immediately after the work 3 in the last stage passes over the conveyor 4, turn on the auxiliary switch. Then, the next operation is automatically performed by the action of the control means. Push rod 27 as shown in phantom line in Figure 1c.
The rods of the hydraulic cylinders 32a, 32b are retracted, and the arms 18a, 18b are moved from the pins 31a, 3
The push rod 27 rotates about 1b and is positioned directly above the conveyor belt 11. Then motor 2
The output shaft of No. 4 rotates by a preset number of rotations,
Immediately thereafter, the rotation is reversed by the same number of revolutions. Therefore, the rotation of the motor 24 is changed from the reducer 25 to the chain 26.
→ Rotating shaft 21a → Sprocket 22a → Chain 2
3→the coupling member 28→the push rod 27, and the coupling member 28 moves from the left end to the right end in FIG. 1a and returns to the left end again. Therefore, as shown in FIG. 2, the push rod 27 is guided by a guide 29 and passes between the upper and lower pinch roll groups 5 to move the work 3 into the heating furnace
After being moved at a predetermined speed within the chamber, heated and lowered from the chute 8, it is moved in the opposite direction and returned to its original position. While the workpiece 3 is being moved by the push rod 27, it is better to turn off the main switch and stop the rotation of the conveyor 4 and pinch roll group 5. Since the outer diameter of the push rod 27 is sufficiently small as described above, it is smaller than the outer diameter of most ordinary workpieces 3, and therefore the push rod 27 comes into contact with the pinch roll group 5 and receives resistance. There is no such thing. In addition, if a small-diameter workpiece 3 whose outer diameter is about the same or smaller than the outer diameter of the push rod 27 is to be transferred, the distance between the upper and lower pinch rolls of the pinch roll group 5 is omitted from illustration. It is sufficient if the pinch roll gap adjustment means is used to widen the gap so that the push rod 27 can pass through without any trouble. The push rod 27 is the guide 29
When fully returned to the top, the hydraulic cylinders 32a, 32b
The rod extends and arms 18a and 18b touch pin 3.
1a and 31b, the push rod 27 moves away from directly above the conveyor belt 11 and returns to its original standby position. To start continuous heating from this state, just turn on the main switch. In the case of trial heating of the workpiece, it can be performed without moving the conveyor 4 and the pinch roll group 5 in the same manner as described above.

In this embodiment, the operation by the push rod is performed fully automatically, but each operation may be performed manually. Also, a motor or the like may be used instead of the hydraulic cylinder as the second driving means. The moving speed of the push rod is controlled by the rotation speed of the motor 24, and the moving distance of the push rod can be set to any desired value by attaching an encoder to the output shaft of the motor 24.

As mentioned above, it is convenient to reduce the outer diameter of the push rod, but even if the outer diameter of the push rod is not made that small considering the life of the push rod, the upper and lower pinch rolls By adjusting the spacing between the push rods, there is no problem in moving the push rod.

H. Effects of the invention As explained above, according to the invention, a pair of arms rotatably equipped with sprockets are connected via a connecting member, and one of the arms is connected to the first drive means. At the same time, the end of the push rod of the chain on the opposite side of the heating furnace is connected to the pair of arms, and a guide tube that supports the bottom surface of the push rod and guides it slidably is connected to the pair of arms, so that the push rod is directly above the conveyor. Since the base ends of the pair of arms are rotatable so that they can move forward and backward, and are connected to the second drive means, the push rod can be kept on standby during normal heating of the workpiece, and the final It can be used immediately when necessary, such as when transporting workpieces, during test heating, or when trouble occurs within the induction heating furnace, without any hassle. Further, there is no need to manually operate a high-temperature and heavy push rod, so there is no danger, and when changing to heating workpieces of different sizes, it can be done easily and quickly, improving productivity. Furthermore, since the push rod is not driven by a group of pinch rolls, one push rod is sufficient if the outer diameter of the push rod is made small to a certain extent, and the distance between the upper and lower pinch rolls can be adjusted. There is no need to move the conveyor and pinch roll group when testing a workpiece.

[Brief explanation of the drawing]

Figures 1 and 2 relate to an embodiment of the heating device according to the present invention, where Figure 1a is a front view, Figure 1b is a plan view, Figure 1c is a left side view, and Figure 2 is an explanation of the operation. figure,
FIG. 3 is a configuration diagram of a conventional heating device. 1... Heating furnace, 3... Workpiece, 4... Conveyor, 5... Pinch roll group, 18a, 18b...
Arm, 19... Connection member, 22a, 22b...
Sprocket, 23...Chain, 24...Motor, 27...Push rod, 29...Guide, 32
a, 32b...hydraulic cylinder.

Claims (1)

[Scope of Claim for Utility Model Registration] A conveyor and a cylindrical induction heating furnace are arranged in sequence along a conveyance line that transports objects to be heated, and the objects to be heated are sandwiched between the conveyor and the induction heating furnace to perform induction heating. In an induction heating device equipped with a group of pinch rolls that are forcibly fed into a furnace, a pair of arms are arranged at positions apart from each other along a conveyance line, and the pair of arms are connected by a connecting member, so that each arm can be A sprocket is rotatably provided at the tip of the sprocket, a first driving means is connected to one of the sprockets, a chain is applied across both sprockets, and a push rod extending horizontally at the bottom of the chain is connected to the opposite side of the heating furnace. and the end of a guide tube that supports the lower surface of the push rod and guides the push rod movably along the conveyance line is connected to the tip of each arm or to the end of the connecting member. The induction heating device is fixed, and the base end of each arm is rotatably provided so that the push rod can advance and retreat directly above the conveyor, and a second driving means is connected to the arm.