KR200278290Y1 - Spark protection roll for induction heater - Google Patents

Abstract

The present invention is a disk for supporting the lower surface of the bar passing through the induction heater is mounted on the body via the insulating material to effectively prevent the current generation by the leakage flux of the induction heater, thereby suppressing the spark generation As the spark prevention roll for induction heater,

Body portion 10 is supported at both ends by the bearing block 132; and, ring-shaped disk is formed to have an inner diameter of a size larger than the outer diameter of the body portion 10 is fitted to the outside of the body portion 10 ( 22, support members 24A and 24B protruding integrally from the body portion 10 and positioned on both sides of the disk 22, and the one support member 24A, the disk 22 and the other support member 24B. And a fastening member 26 for keeping the inner diameter of the disk 22 away from the outer diameter of the body portion 10, the contact portion of the disk 22 and the supports 24A, 24B, and the disk. Comprising the insulating material 28A, 28B fitted to the contact portion of the 22 and the fastening member 26, the disk portion 20 which is provided at regular intervals in the longitudinal direction to the outer surface portion of the body portion 10; It is characterized by including.

Description

Spark protection roll for induction heater

The present invention relates to a roll used in an induction heater, and more particularly, a disk for supporting the lower surface of the bar passing through the induction heater is mounted on the body part via an insulating material, which is caused by the leakage flux of the induction heater. It relates to a spark prevention roll for an induction heater to effectively prevent the current generation, thereby suppressing the spark generation.

As shown in FIG. 1, the induction heating facility of a steel mill has an induction heater 110 installed at a predetermined interval on a traveling path of a bar 120, and is generated in the induction heater 110. The temperature of the bar 120 is increased by inducing a secondary current inside the bar 120 by the magnetic flux.

Of course, the induction heater 110 may be a built-in coil to generate a magnetic flux, and forms a through-hole 112 through which the bar 120 passes, between the induction heater 110 The roll 130 is installed to support the lower surface of the bar 120 so that the bar 120 can move smoothly. The induction heater 110 and the roll 130 are mounted on the support 140 of the facility. Each will be mounted.

However, the magnetic flux generated in the induction heater 110 is not only formed inside the induction heater 110 but also generates a leakage magnetic flux through the side bar. The leakage magnetic flux is the bar 120 and the roll 130. Generates a current therebetween, and thus sparks 150 occur at the lower edge portions of both ends of the bar 120 (see FIG. 2A), and the sparks 150 generated as shown in FIG. 2B are rolled as shown in FIG. 2B. The outer surface of both ends of 130 is rapidly worn out.

As such, the wear part 134 generated on the outer surface of both ends of the roll 130 is not preferable to be a frequent replacement factor of the roll 130, and both ends of the bar 120 in the hot state proceeding above are lowered. By causing the deformation bent to the side was to cause an accident with the induction heater (110).

One conventional method for preventing this is as shown in Fig. 3a, the roll 210 is composed of a central axis 212 and the roll shell (216) forming the outer surface portion of the central axis (212). In order to prevent sparking by forming a ceramic coating layer 214 between the central axis 212 and the roll shell 216, it is still possible to generate current between the bar 120 and the roll shell 216 due to leakage flux. Since it is present, the problem that sparks are generated at the corners of both ends of the bar 120 has not been solved.

In addition, another conventional method, as shown in Fig. 3b, the outer roll 224 having a roll 220 having a center roll 222 and an outer diameter smaller than the center roll 222 on both ends of the center roll 222. By forming a step between the outer surface of the center and the outer surface of the both ends to prevent the occurrence of sparks by preventing both ends of the bar 120 in contact with the outer surface of the roll 220, but also the bar 120 There is still a current generated by the leakage magnetic flux between the center roll 222 and the center roll 222 does not solve the problem that sparks occur at the contact portion of the center roll 222 and the bar 120 (that is, only the spark generation portion is changed). Of course, both ends of the bar 120 sag downward in such a step forming portion, and the possibility of collision between the bar 120 and the induction heater 110 was very high.

In addition, the leakage magnetic flux from the induction heater 110 generates a current on the bearing block 132 side through the roll 130, it was also a conventional problem that the bearing portion is damaged by sparks.

The present invention was devised to solve such a conventional problem, and its purpose is to prevent roll current caused by spark generation by preventing current from being generated between the roll and the bar by the leakage flux of the induction heater. It is to provide a spark prevention roll for induction heater.

1 is a schematic view showing a general induction heating equipment

Figure 2a is an explanatory view showing a state in which sparks occur in the roll for induction heater

Figure 2b is an explanatory diagram showing a state that the roll for induction heater is worn by the spark generation

3A and 3B are schematic configuration diagrams showing rolls for suppressing sparking according to the prior art;

Figure 4 is a schematic view showing a spark prevention roll for induction heater according to the present invention as a whole

Figure 5 is a side schematic view of Figure 4

Figure 6 is a detailed cross-sectional view of the main part of the present invention.

Explanation of symbols on the main parts of the drawings

10 ... body

20 ... disc section

22 ... disc

24A, 24B ... Support

25 ... bush

26 ... fastening member

28A, 28B ... Insulation

The present invention as a technical configuration for achieving the above object,

A roll for an induction heater configured to support a lower surface of a bar while rotating between induction heaters which generate a magnetic flux and induce a secondary current inside the bar to raise the temperature of the bar.

Body parts supported at both ends by a bearing block; And,

Ring-shaped disk is formed to have an inner diameter larger than the outer diameter of the body portion fitted to the outside of the body portion, the support is formed integrally protruding from the body portion located on both sides of the disk, the one side support, the disk and the other side A fastening member fastened to penetrate the support to keep the inner diameter of the disk away from the outer diameter of the body portion, and an insulating material fitted to the contact portion of the disk and the support and the contact portion of the disk and the fastening member, the outer surface portion of the body portion By providing a spark preventing roll for an induction heater characterized in that it comprises a; disk portion provided at regular intervals in the longitudinal direction.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a configuration diagram showing the spark prevention roll (1) for the induction heater according to the present invention as a whole, both the body portion 10 is supported by the bearing block 132, the outer surface of the body portion 10 It can be seen that the portion consists of a disk portion 20 provided at regular intervals in the longitudinal direction.

There is no particular limitation on the spacing of the disk portion 20 and the thickness of the disk 22, which is one of the components of the disk portion 20 and which is in direct contact with the bottom surface of the bar 120, but is not limited thereto. If the spacing of the disk portion 20 is too large, there is a risk that the hot bar 120 may be drooped downwards therebetween, and if the spacing of the disk portion 20 is too small, the number of parts increases excessively to prevent sparking. If the roll 1 is not preferable in terms of fabrication, etc., if the thickness of the disk 22 is too small, wear due to friction proceeds rapidly, which is undesirable in terms of life, and the thickness of the disk 22 is too large. There is a possibility of current generation due to leakage flux of the induction heater 110 between the bar 120 and the disk 22, which is not preferable. 4 shows that when the length of the disk portion 20 is L, the distance between the disk portions 20 is 2L, which is merely an example and not a limitation.

The disk portion 20 is formed to have an inner diameter larger than the outer diameter of the body portion 10 has a ring-shaped disk 22 fitted to the outside of the body portion 10, such a disk 22 ) Is in direct contact with the bottom surface of the bar 120 and serves to support the bar 120, and in accordance with the circumferential direction of the body portion 10 as shown in FIG. It is preferable to consist of a plurality of divided disks 22A, 22B and 22C. At this time, the gaps G1 can be formed between the disks 22A, 22B, and 22C so as to be spaced apart from each other, and this gap G1 is circumferentially formed by the disks 22A, 22B, and 22C by thermal expansion. It is preferable that the disks 22A, 22B and 22C do not come into contact with each other even in the case of maximum expansion in consideration of the degree of expansion in the direction.

The disk 22 is integrally protruded from the body portion 10 and is fixed to the support 24A, 24B positioned on both sides of the disk 22. The one support 24A, the disk 22 and the other side are fixed. The fastening member 26 fastened and fixed to penetrate the support 24B plays its role, and the fastening member 26 may be a conventional one consisting of a bolt member and a nut member as shown in the drawing. Of course, the inner diameter of the disk 22 which is fixed to the support 24A, 24B by the fastening member 26 so as to form a gap (G2) apart from the outer diameter of the body portion 10, The size of the gap G2 is such that the inner diameter of the disc 22 may increase in the radial direction of the body portion 10 even when the disc 22, the support 24A, 24B, and the like expand in the radial direction of the body portion 10. It is preferable to set to such an extent that it does not contact an outer diameter part.

Of course, the fastening member 26 is preferably provided with a plurality of discs 22 at regular intervals in the circumferential direction so as to minimize the deformation of the disk 22 in contact with the lower surface of the bar 120 to the reaction force thereto. In the case where a plurality of 22 is formed, at least two fastening members 26 must be fastened for each one of the disks 22A, 22B, and 22C. For this purpose, at least two fastening members 26 must be fastened to each of the disks 22A, 22B, and 22C. Two fastening member penetrating holes 23A and 23B are formed. At this time, except for one of the holes, the disks 22A, 22B, and 22C are preferably formed in long holes in the circumferential direction to compensate for the expansion in the circumferential direction due to thermal expansion.

In addition, it is preferable to have a separate means for compensating the disk 22, the support 24A, 24B and the fastening member 26 for thermal expansion in the longitudinal direction of the body portion 10, in detail in FIG. As shown, one side of the support 24A, 24B has a bush 25 that slides in the direction in which the fastening member 26 is fastened, and the fastening member 26 is fastened to penetrate through the bush 25. Be sure to

An insulating material 28A (28B) such as mica having an appropriate thickness is inserted between the contact portion of the disk 22 and the support 24A and 24B and the contact portion of the disk 22 and the fastening member 26. Bar, this insulating material 28A, 28B completely blocks the electrical passage between the disk 22 and the fastening member 26, and also the electrical passage between the disk 22 and the supports 24A, 24B. And completely block the electrical passage between the disk 22 and the body portion 10.

Spark prevention roll 1 of the present invention made of the above configuration is installed to support the lower surface of the bar 120 between each induction heater 110 so that the bar 120 can be moved smoothly, bar 120 The width of the disk 22, which is a part in direct contact with the disk, is small, as well as the disk 22 is electrically blocked by the body portion 10 and the insulating materials 28A and 28B. ) And the disk 22 is very unlikely to form a current due to the leakage magnetic flux of the induction heater 110, and therefore the possibility of sparking at the contact between the disk 22 and the bar 120 is very unlikely Do. This prevents the disk 22 from being rapidly worn by the sparks and significantly improves its life, thereby improving the operating efficiency of the equipment.

Since the insulating material 28A, 28B is completely electrically disconnected between the disk 22 and the body portion 10, the current flows toward the bearing block 132 side that supports both ends of the body portion 10. It is completely blocked to prevent breakage due to spark of the bearing block 132.

In addition, it is possible to effectively cope with the thermal expansion of the components constituting the roll (1) of the present invention, the configuration of the roll (1) for thermal expansion in the circumferential direction of the body portion 10, and thermal expansion in the longitudinal direction The actions of the elements will be explained respectively.

First, in the case of thermal expansion in the circumferential direction of the body portion 10, this is the case that the outer diameter of the body portion 10 increases due to thermal expansion, or the disk 22 increases in the circumferential direction of the body portion 10 by thermal expansion This thermal expansion can be compensated for by the fastening member penetrating holes 23B formed in the disk 22 in the form of a long hole. That is, when the position where the fastening member 26 is initially engaged changes in the circumferential direction by thermal expansion, the fastening member 26 located in the long hole 23B slides in the circumferential direction along the hole 23B. It can absorb thermal expansion while moving.

Next, in the case of thermal expansion in the longitudinal direction of the body portion 10, the length of the body portion 10 itself increases, or the disk 22, the support 24A, 24B and the fastening member 26 are subjected to thermal expansion. This is a case where the body portion 10 increases in the longitudinal direction, and such thermal expansion may be compensated by the bush 25 through which one side of the fastening member 26 passes. That is, in the case where the state in which the fastening member 26 is initially fastened is changed in the longitudinal direction by thermal expansion, the bush 25 supporting one side of the fastening member 26 is formed at the support 24B. It is able to absorb thermal expansion while sliding in the longitudinal direction.

As described above, according to the spark prevention roll for induction heater according to the present invention, the disk for supporting the lower surface of the bar passing through the induction heater is mounted on the body via an insulating material, the current by the leakage flux of the induction heater It is effective to prevent the occurrence, thereby suppressing the occurrence of sparks, thereby preventing the wear of the roll rapidly to improve the life and improve the equipment efficiency.

Claims (3)

The magnetic flux is generated between the induction heaters 110 to raise the temperature of the bar 120 by generating a secondary current inside the bar 120 to rotate and support the lower surface of the bar 120. In roll for induction heater, Body portion 10 is supported by both ends of the bearing block 132; And, Ring-shaped disk 22 is formed to have an inner diameter larger than the outer diameter of the body portion 10 is fitted to the outside of the body portion 10, and integrally protruded from the body portion 10 disk ( 22) The inner diameter portion of the disk 22 is fastened so that the support 24A, 24B positioned at both sides and the one support 24A, the disk 22, and the other support 24B are penetrated. Fastening member 26 for keeping it away from the outer diameter portion, and insulating material 28A fitted to the contact portion of the disk 22 and the support 24A, 24B and the contact portion of the disk 22 and the fastening member 26. 28B, the outer surface portion of the body portion 10 is provided with a disk unit 20 provided at regular intervals in the longitudinal direction; spark prevention roll for induction heater comprising a. The method of claim 1, The disk 22 is composed of a plurality of disks 22A, 22B, 22C divided at regular intervals along the circumferential direction of the body portion 10, and between the disks 22A, 22B, 22C. The gaps G1 are formed apart from each other, and each of the disks 22A, 22B, and 22C forms at least two fastening member penetrating holes 23A and 23B spaced in the circumferential direction, and the holes 23A. The spark prevention roll for induction heaters, characterized in that the other one of 23) is formed in a long long hole in the circumferential direction. The method of claim 1, One side of the support (24A, 24B) has a bush 25 for sliding in the direction in which the fastening member 26 is fastened, characterized in that the fastening member 26 is fastened so as to pass through the bush (25) Spark protection roll for induction heater.