JPS6223926A - Induction heating apparatus - Google Patents

Abstract

PURPOSE:To heat uniformly only circumferential surface of material to be heated and to prevent wear of a furnace core tube, by supporting material to be heated introduced through a chute by a supporting means then discharging it outside the furnace core tube in the vertical furnace core tube of an induction heating furnace. CONSTITUTION:A billet 1 being material to be heated supplied from supplying chutes 13, 14 is mounted and carried on a belt 20 of a conveyer 12, charged in the furnace core tube 15a arranged so that the shaft core becomes parallel to vertical line in the induction heating furnace 15 through the chute 17, and supported on a supporting base 28 of the supporting means 16. Next, high or medium frequency source (figure is omitted) is connected to a coil 15b wound around circumference of the tube 15a, to heat the billet 1 for a prescribed time. Thereafter, the base 28 on a cover 27 is lowered by operating a cylinder 29 whose base end is attached to a case 11 freely turnably to slant the billet 1 mounted thereon and to carry it on a chute 18 and to transfer it to next forging stage.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an induction heating device capable of uniformly heating the entire material to be heated.

B2 Summary of the Invention This invention provides an induction heating device for induction heating a material to be heated by winding a coil around the outer periphery of a furnace core tube and passing the material through the interior of the furnace core tube. By providing a furnace core tube such that it is parallel to the vertical line and supporting means for supporting the material to be heated within the furnace core tube such that the axis of the furnace core tube and the axis of the material to be heated substantially coincide with each other. , The entire heated material is heated evenly, and wear of the furnace core tube etc. due to the weight of the heated material being added to the furnace core tube etc. is prevented.

C1 Prior Art In order to continuously forge a billet, etc., it is necessary to heat the billet continuously. Conventionally, an induction heating apparatus shown in FIGS. 4(a) to 4(C) has been used to continuously heat a member to be heated such as a billet.

In the figure, the billet 1 is fed onto the conveyor belt 3a by a feeding device indicated by 2, and the billet 1 on the conveyor belt 3a is guided by the guide 4 and conveyed to the left in FIG. Sliding from 5 to pace 6 7. A conveyor belt 3a is wound around a pair of rollers 3b, and a motor 3C is connected to one of the rollers 3b. Billet;・When 1 slides onto the base 6, the conveyor belt 3a
The button (cylinder) 7 provided directly below operates,
The billet 1 is pushed into the heating furnace 8 by a pusher 78. The heating furnace 8 is an induction heating furnace that uses electric power supplied from a high frequency or medium frequency power source ρ provided in a case 9, and the billet 1 pushed into the heating furnace 8 is The heating furnace 8 is pushed and moved sequentially.
When it exits from the left end, it is heated by induction and reaches a predetermined temperature. The billets sequentially extruded from the heating furnace 8 slide down the chute 10 and move to the next process. These series of operations are controlled by the control device housed in the case II.
Controlled by correlation.

By the way, the cross-sectional structure of the heating furnace 8 is as shown in FIG. 4(d). That is, the coil 8b is wound around the outer periphery of a refractory furnace core tube 81k (7) arranged so that its fine edge is located on a horizontal plane.

However, when the billet 1 is pushed out and moved within the furnace core tube 8a, the lower part of the inner circumferential surface of the furnace core tube 8IL is worn out due to contact with the billet 1. Therefore, when heating a heavy billet 1, the coil 8b is wound. A pair of skid rails 8c are installed inside the furnace core tube 8a, and the skid rails 8
There are 41 types that allow billet 1 to be conveyed on c.

D1 Problem to be Solved by the Invention However, in both of the above cases, the axes of the four core tubes are on a horizontal plane, so the bottom surface of the billet is supported in contact with the core tube and the skid trail, and the heat of the billet is There is a drawback that it escapes from this contact part to the reactor core tube or skid rail. As a result, the temperature of the outer peripheral surface of the billet becomes non-uniform, which adversely affects the forging process. Furthermore, as described above, since the billet is extruded while the weight of the billet is applied to the furnace core tube and skid rail, there is also a drawback that the furnace core tube and skid rail are worn out and their lifespan is shortened.

Therefore, it is an object of the present invention to provide an induction heating device that eliminates such deficiencies.

Means for Solving Problem E9 The structure of the present invention for achieving the above object is to wind a coil around the outer periphery of a reactor core tube arranged so that its axis is parallel to the vertical line, and to an induction heating furnace connected to a high-frequency or medium-frequency power source; a chute installed above the furnace tube and guiding the material to be heated into the furnace tube; and a chute installed below the furnace tube and connected to the A special F characterized by comprising a supporting means for supporting the material to be heated within the reactor core tube for a predetermined period of time and then ejecting the material to the outside of the reactor core tube. falls into the furnace tube of the heating means with zero rust conductivity. A support means is located below the furnace core tube, and the material to be heated is held within the furnace core tube for a predetermined period of time while being supported by the support means, and is heated by induction. At this time, the material to be heated is supported by the support means and does not come into contact with the furnace core tube, so if the material to be heated is columnar, it is heated uniformly without heat being taken away from the outer peripheral surface to the furnace core tube, etc. will be done. After a predetermined period of time has elapsed, the heated material is discharged from the furnace tube by the function of the support means, and the next material to be heated slides down from the chute into the furnace tube, so that the material to be heated is continuously heated. Ru.

G. Example First, Example 1 of the present invention will be described based on FIGS. 1(a) to (d).

As shown in the figure, a conveyor 12 is placed on top of the case 11, and above the conveyor 12 there are supply chutes 13, 14.
A rust induction heating furnace 15, a support device 16, and chutes 17 and 18 are arranged on the right side of the case 11.

It consists of 12 conveyors, a conveyor belt 20 wound between a pair of rolls 19, and a motor 21 connected to one of the rolls 19 (conveyor belt) 2
A position sensor 22 is attached near the right end of 0 to detect the passage of the billet 1 as a heat material. As this position sensor, for example, a touch sensor, a proximity sensor, etc. are used.

The feed chute 13 provided on the upper left side of the conveyor 12 is for feeding small billets 11, while the feed chute 14 provided on the right side is for feeding large billets 1. .

The induction heating furnace 15 is placed on a base 23 attached to the right side of the case 11. The n-conducting thermal furnace 15 is similar to the conventional one, with the outer periphery 1' of the furnace tube 15 & coil 15b
The difference is that the core tube 15B is arranged parallel to the vertical line. A through hole 23a is formed in the center of the base 23, which is an extension of the furnace tube 15a, and the coil 15b is connected to a high frequency or medium frequency power source 25 via a cable 24.

A chute 17 is provided above the induction heating furnace 15 to guide the billet 1 on the conveyor bell 20 into the furnace core tube 15. It is formed into a hollow dogleg shape and is attached to the case 11 via the stay 26,
The hill end opens toward the right end of the conveyor belt 20, while the lower end opens toward the inside of the furnace core tube 15a.

A support device [16] is provided below the induction heating furnace 15 and below the base 23. A lid 27 is rotatably attached to the bottom of the base 23 via a bottle, and a support base 28 for supporting the billet 1 is attached to the top surface of the tip of the lid 27. On the other hand, the tip of a rod of a cylinder 4 whose base end is rotatably attached to the case 11 is rotatably coupled to the lower surface of the lid n.

Under the base 23 dIn addition, the lid T opens and the reactor core tube 15
A chute 18 is provided for transporting the billet 1 that falls when the support stand 28 located inside the furnace tube 15a comes out of the furnace core tube 15a to a place where it is to be forged.

The position sensor 22, the supply chutes 13 and 14, the motor 21, the cylinder 16, the bowl, and the source 25 are each connected to a control device housed in the case 11. It is now being driven by stuttering the correlation.

Note that heat escapes from the bottom surface of the billet 1 to the support base 28, which lowers the temperature in this area, so the winding pitch of the coil lsb in the lower part of the core tube 15& is set closer than in other parts. It's good to keep it. In addition, if accuracy of the heating temperature of billet 1 is required, billet]
The induction heating furnace 15 may be provided with a thermometer that detects the temperature thereof, and may be connected to the power source 25 to control the supply of electric power to the induction heating furnace 15.

Next, the operation of such an induction heating device will be explained.

In order to explain the case where one small billet is heated, the supply chute 13 is used as the supply chute. The billets 1 supplied one by one from the supply chute 13 are placed on the conveyor bell (20) and are conveyed as shown in Fig. 1 (a).
), the billet 1 is transported to the right, and the position sensor 22 detects the passage of the billet 1. The billet 1 conveyed to the right by the conveyor belt 20 is transferred from the chute 17 to the induction heating furnace l5.
0) The furnace core tube 15a falls 1° into the support table 28. On the other hand, after a predetermined time (tJ time sufficient for the billet 1 to be loaded onto the support base 28) after the position sensor 22 detects the passage of the billet 1, the power source 25 turns on the pull 24. A high-frequency or medium-frequency current is passed through the coil 15b for a predetermined period of time. Then, the billet 1 is heated by induction heating for a certain period of time, after which the cylinder 29 operates and the lid 27 is heated as shown in FIG. 1(d).
opens. Then, the support stand 28 tilts and the billet 1 falls, and is carried from the billet It-1 chute 18 to the next process.

After opening the lid 27 times, close it quickly and add the next billet 1.
However, until t when the billet 1 enters the induction heating furnace 15, the energization time of the other cylinders on the conveyor belt 20 is set to be synchronous. When the billet 1 passes in front of the position sensor 22, the position sensor 22 detects this and stops the rotation of the motor 21 and the supply of the billet 1 from the supply chute 13. After the cylinder 29 operates to open the lid 27 and the heated billet 1 is discharged and the lid 27 is closed again, the motor 21 rotates and the billet 1 is discharged from the supply chute 13.
supply will begin. All of these control needs are performed by a control device housed in the base 11 according to a program installed in advance.

In the induction heating furnace 15, the billet 1 is placed on the support stand 28 for induction heating, so the outer peripheral surface does not come into contact with the furnace core tube 15a, etc. 15α
It is difficult for heat to escape to other places. Therefore, the outer peripheral surface of the billet 1 is heated uniformly. Heat escapes from the billet 1 to the support base 28, but this can be countered by taking steps to generate more heat in the lower part of the billet 1 as described above. In addition, since the billet 1 does not come into contact with the furnace core tube 15a, problems such as wear of the inner circumferential surface of the furnace core tube 15a as in the conventional case do not occur. Even when replacing the induction heating furnace I5 with a different size induction heating furnace I5, it is easy to replace because there is no skid rail and it is a short continuous furnace that is only long enough to accommodate one billet.

Next, a second embodiment of the present invention will be explained based on FIG. 2. It should be noted that, since this embodiment differs only in the support device of the first embodiment, the same parts will be designated by the same reference numerals and their explanation will be omitted, and only the different parts will be explained.

As shown in FIG. 2(a), a support #30 is provided below the induction heating furnace 15. A long cylinder 31 whose axis is an extension of the axis of the furnace core tube 15& is mounted on the base 23 via a stay 31, and a support base 32 is fixed to the rod 31& of the cylinder 31. On the other hand, a claw 34 is attached to the right side surface of the case 11 so as to be rotatable about the center via a stay 33.

It has a 34-key shape, and is biased by a spring 35 to rotate counterclockwise. Then, in order to accurately position the billet 1 within the induction heating furnace 15,
The inner diameter of the lower end opening of the chute 36 is slightly larger than the outer diameter of the billet 1 by 4 points. Since the axis of the opening of the chute 36 is also on the extension of the axis of the induction heating furnace 15, the axis of the opening of the chute 36, the axis of the induction heating furnace 15, and the axis of the cylinder 31 coincide.

Next, the operation of such an induction heating device will be explained.

When the billet 1 falls onto the chute 36 with the rod 31 extended as shown in FIG. The fl, rod 3]a is lowered halfway and the billet] is heated in the induction heating furnace 15 for a predetermined period of time while being supported by the support stand 32. After heating, the load 31 is
Lower m to the bottom. Then, the support stand 32 is moved to the claw 34.
Press downwards at the bottom and rotate claw 34 to the right? so that the top of the claw 34 tilts the billet 1 to the right in the diagram,
Billet 1 is transported to the next process by chute 18. When the rod 31& is extended, the claw 34 released from the restraint by the support base 32 returns to its original state by the force of the spring 35. As mentioned above, the lower end opening of the chute 36 is formed to be slightly larger than the outer diameter of the billet 1,
and the axis of the opening, the axis of the induction heating furnace 15, and the cylinder 3.
1 are on the same straight line, the billet 1 can be accurately positioned at the center of the furnace tube 15& and can be heated by induction. Therefore, the outer peripheral surface of the billet 1 is heated,
Suitable for forging into precise shapes. Note that the chute 36 is prepared in advance to suit the outside diameter of various billets 1, and the chute 36 is replaced when the outside diameter of the billet 1 to be heated changes. Others (c) are the same as in Example 1, so their explanation will be omitted.

Next, a third embodiment of the induction heating device according to the present invention will be described based on FIG. 3. It should be noted that since this is just an improvement on the apparatus of Example 2 so that it can heat billets of different sizes, a brief explanation will be given and a description of the same parts will be omitted.

As shown in the figure, induction heating furnaces 37 and 38 of two sizes, support equipment f139 and 40, and shoes) 41 and 42 are arranged in parallel, and a power source 25 connects the induction heating furnace 37 and Vi3B.
A switch 43 is provided to switch the energization to. Note that switching of the matching circuit and the like in the power source 25 may be performed by providing a changeover switch that is linked to the changeover device 43 as necessary. Further, a switching chute 44 is employed to switch the charging of the billet 1 from above the conveyor belt 20 to the induction heating furnace 37 or 38. The switching chute 44 includes a large diameter portion 44 & a small diameter portion 44b, and has a rotatable gate valve 44 inside.
It has e. A cylinder 46 is attached to the small diameter portion 44 bl through a knee and a stay 45, and the tip of the rod of the cylinder 46 is rotatably connected to the gate valve 440.

If such an induction heating device is used to heat a large billet, the feed chute 14. Large diameter portion 44a of switching chute 44, induction heating furnace 37. A support device 39 and a chute 41 are used. Also, when heating a small billet 1, supply chute 13. Small diameter portion 4 of switching chute 44
4b, induction heating furnace 38. Support equipment.

A chute 42 is used. This device is used to supply large and small billets 1 from the supply chutes 13 and 14, and the gate valve 44c, switch 43 and support device 39 based thereon.
, 40 are performed in conjunction with each other by a control device, and two types of billets 1 with different sizes are automatically heated alternately or in any number of combinations and then supplied to a subsequent process, for example, to multiple casting machines. You can do that.

In this embodiment, a conveyor or the like is provided for the purpose of conveying the material to be heated in the horizontal direction, but the structure is not limited to this. Moreover, various configurations other than those shown in this embodiment are conceivable as the supporting means.

As described in detail of the H2 invention, according to the present invention, since it is parallel to the vertical line which is the axis of the furnace tube, the material to be heated can be placed inside the furnace tube with the material placed on the support stand. By conducting heat conduction, the outer circumferential surface of the material to be heated can be uniformly heated without bringing the material into contact with the furnace core tube or the like. In addition, when heating a material that has an outer diameter that is considerably smaller than the inner diameter of the furnace core tube, conventionally the lower surface of the material to be heated is in contact with the inner peripheral surface of the furnace core tube, and the distance from the coil is in the circumferential direction. However, by providing a means 1 that can set the material to be heated so that it is located in the center of the furnace tube, uniform heating can be achieved regardless of the size of the material to be heated. Therefore, how large is the material to be heated that can be heated uniformly with the same Shima-conductor heating furnace without any problems? The range is wide. Furthermore, since the material to be heated does not move in contact with the inner circumferential surface of the furnace core tube as in the conventional case, there is no need to provide a skid rail or the like to prevent the furnace core tube from being worn out. Furthermore, it is easy to replace the induction heating furnace depending on the size of the material to be heated, and materials to be heated of different sizes can be heated alternately or in any number of combinations and supplied to subsequent processes. is also easy.

[Brief explanation of the drawing]

1 to 3 relate to □Embodiments of the induction heating device according to the present invention, and FIGS. 1(a) to 3(d) show Embodiment 1,
wc1 figure (a) i front 1iQ, 111(b) U”
F view, right side view of Figure i'1 (c), No. 111H (
d) is an explanatory diagram of the action, Figures 2 (a) to (d) show Embodiment 2, Figure 2 (a) is a front view, Figure 2 ('b) is a plan view, and Figure 2 (a) is a front view. ) is a right side view, FIG. 2(d') is an action explanatory diagram, @3 is a right side view showing Example 3, and FIG.
) to (e) relate to the conventional induction heating device, and are shown in Fig. 4(a).
is a front view, 4th exit) is a plan view, FIG. 4(C) is a right side view, and FIGS. 4(d) and (e) are enlarged sectional views of section A in FIG. 4(a). . 15, 37, 38...induction heating furnace, 15&...
Furnace tube, 15b...Coil, 16, 30, 39
, 40... Supporting means, 17, 36... Chute, 44... Switching chute. (b) Fig. 1 Re-front view of G2Fl induction support Tatsuoki (Torakata Seita 111 of blade head C Akira) 1 Kidney 15b --- Coil 16.30, 39.40 --- f Fi means 17.
36---Pick up the chute 44-1 and take the sword θ1 and chute 2nd picture.

Claims (1)

[Claims] An induction heating furnace is constructed by winding a coil around the outer circumference of a core tube arranged so that its axis is parallel to a vertical line, and connecting the coil to a high-frequency or medium-frequency power source; Consisting of a chute that is arranged and guides the material to be heated into the furnace core tube, and a support means that is provided below the furnace core tube and supports the material to be heated within the furnace core tube for a predetermined time and then discharges it out of the furnace core tube. An induction heating device characterized by: