JPH0585842U - High frequency heating coil spacer and high frequency heating coil spacer mounting structure - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Providing a spacer in which the gap length between the heating coil and the workpiece can be adjusted. [Structure] An octagonal adjustment piece 20 arranged between a protrusion 16 of a spacer 10 and the other end 13, and a spacer that slidably holds the spacer in a direction connecting one end 11 and the other end 13 and is attached to a coil side plate 90A. The fixed backup guide 30 and the bolt 40 having a diameter smaller than the diameter of the opening, which penetrates the hole of the adjustment piece and the opening 14 of the spacer to fix the adjustment piece to the backup guide 30 via the spacer, are provided. The shape of the polygon is such that the shortest distance between the center of the polygon and each side is set to a predetermined value for each side, the bolt is loosened, and the side corresponding to the desired gap length is set to the protrusion. A spacer that can obtain a desired gap length by turning the adjustment piece so as to be in close contact with the surface on the other end side of the
10 coil side plate mounting structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spacer for a high-frequency heating coil for maintaining a constant gap length between the high-frequency heating coil and a workpiece, and a structure for mounting this spacer.

[0002]

[Prior Art]

 Hereinafter, a conventional technique will be described with reference to the drawings. First, a first conventional example of a spacer for a high frequency heating coil (hereinafter also simply referred to as a heating coil) and a mounting structure for the heating coil spacer will be described. FIG. 14 is a perspective view of a spacer of the first conventional example, and FIG. 15 is a partially cutaway partially transparent front explanatory view of a mounting structure of this spacer.

As shown in FIG. 14, the spacer 71 is made of superhard metal or ceramic, and has one end 71a having a substantially rectangular shape and the other end 71b having a substantially trapezoidal shape integrally formed with the one end 71a. Is equipped with. Two bolt holes 98 for attaching the spacer 71 to the coil side plate 99 are formed at one end 71a, and the tip 71c of the other end 71b contacts the work W.

As shown in FIG. 15, the heating coil 70 is arranged between a pair of parallel metal coil side plates 99, 99. Further, the heating coil 70 fixes a pair of bolts 72 and these bolts 72 to the coil support member 74 on an L-shaped metal coil support member 74 held between the coil side plates 99, 99. The nut 73 and the bolt 72 are supported through an unillustrated insulating tube that is isolated from the coil support member. The spacers 71 are attached to the coil side plate 99 by bolts 97 in a total of three pairs and six spacers on the central portion and both sides of the heating coil 70. Reference numeral 81 is a power supply conductor that supplies power to the heating coil 70.

When the heating coil 70 is placed on the hardened portion 102 which is, for example, a journal portion or a pin portion of a crankshaft, the tip 71c of the spacer 71 comes into contact with the hardened portion 102 and the heating coil 70 The gap length between the hardened part 102 is kept constant.

Next, a second conventional example of the mounting structure of the heating coil spacer and the high frequency heating coil spacer will be described. As shown in FIG. 16, the spacer 60 has one end 60a formed in a rectangular parallelepiped shape, and the other end 60b is provided with a protrusion 60d in a direction perpendicular to the direction connecting the one end 60a and the other end 60b. There is. The tip 60c of the other end 60b contacts the work.

As shown in FIG. 17, one end 60a of the spacer 60 is attached between the coil side plates 96 (upper side in FIG. 17) similar to that described in the first conventional example by a bolt (not shown). It is housed in 61, and the spacer 62 prevents the spacer 60 from falling off. Reference numerals 63 and 64 are a plurality of thin plates made of metal or the like and having a constant known thickness dimension.The change in the gap length between the heating coil and the workpiece not shown in FIG. It is done by increasing or decreasing.

[0008]

[Problems to be solved by the device]

 However, in the spacer and the spacer mounting structure of the first conventional example, when the spacer is consumed, the size of the gap between the work W and the heating coil 70 becomes shorter than the desired value, so that the desired gap length can be obtained. Must be replaced with a new spacer. That is, it takes time and effort to remove the spacer and replace it with another spacer. In addition, after replacing the spacer, it is necessary to measure the void length and check whether the prescribed void length has been obtained. Incidentally, for example, when quenching a pin or a journal of a small crankshaft, a desired gap length between the heating coil 70 and the pin or the journal varies between about 0.3 and 0.5 mm depending on the type of the crankshaft.

Further, in the second conventional example, in order to change the gap length between the work and the heating coil, the case 61 and the lid 62 are once removed from the coil side plate 96, the number of thin plates 63 and 64 is adjusted, and then again. The case 61 and the lid 62 are attached to the coil side plate 96. When removing or installing the lid 62 and the case 61 from the coil side plate 96, first, it is necessary to remove the connection between the coil side plate 96 and the heating coil. As described above, in the conventional example of the second example, it is extremely troublesome to remove and attach the lid 62 and the case 61, and to remove and attach the heating coil from the coil side plate 96.

The present invention was devised in view of the above circumstances, and it is possible to adjust the air gap length between the heating coil and the work to a desired value by a simple work that does not require time and labor, and to adjust the gap. It is an object of the present invention to provide a heating coil spacer mounting structure that does not require actual measurement and confirmation of the air gap length later, and a high-frequency heating coil spacer used in this mounting structure.

[0011]

[Means for Solving the Problems]

 In order to solve the above problems, the heating coil spacer of the present invention has one end attached to the coil side plate so as to maintain the gap length between the high frequency heating coil attached to the coil side plate and the work at a predetermined value. The other end comes into contact with the work, and the one end has a protrusion in a direction substantially perpendicular to the direction connecting the one end and the other end.

The high frequency heating coil spacer mounting structure according to claim 2 of the present invention is the spacer mounting structure, wherein the spacer mounting structure is disposed between a protrusion at one end and the other end of the spacer and has a through hole. A polygonal adjustment piece, a backup guide that holds the spacer slidably in the direction connecting the one end and the other end, and is fixed to the coil side plate, a through hole of the adjustment piece, and an opening provided in the spacer are penetrated. The adjustment piece is fixed to the back up guide via the spacer and has a bolt with a diameter smaller than the diameter of the opening.The polygon of the shape of the adjustment piece has the shortest distance between the center of the polygon and each side. It is set to a predetermined value for each side, loosen the bolt, turn the adjustment piece so that the side corresponding to the desired gap length is in close contact with the surface on the other end side of the protrusion, and place the spacer. Move in the direction After that, the desired length of the air gap is obtained by tightening the bolt.

According to a third aspect of the present invention, there is provided a structure for mounting a spacer for a high frequency heating coil, wherein one end of the coil has one end so that a gap length between the high frequency heating coil mounted on the pair of coil side plates and a work is kept at a predetermined value. In a mounting structure of a pair of high-frequency heating coil spacers attached to a side plate and having the other end in contact with a workpiece, the spacers are arranged between the pair of coil side plates, and both ends are rotatably attached to the pair of coil side plates. An adjustment piece having a polygonal cross section, a pair of guides fixed to the coil side plates and slidably holding the spacer in a direction connecting the one end and the other end, and arranged between the pair of spacers. A spacer block that is provided to keep the distance between the spacers constant, and a spacer that has a diameter smaller than the diameter of the opening provided in the spacer and that is held by the pair of coil side plates, guides, and guides. And a bolt penetrating through an opening provided in each of the spacer blocks, and the polygon of the shape of the adjustment piece is such that the shortest distance between the center of the polygon and each side is a predetermined value for each side. It is set by loosening the bolt, turning the adjusting piece so that the side corresponding to the desired gap length faces the end surface of one end of the spacer, and moving the spacer in the direction. After the one end face of the spacer is brought into close contact with the adjustment piece, the above-mentioned bolt is tightened to obtain the desired gap length.

According to a fourth aspect of the present invention, there is provided a high-frequency heating coil spacer mounting structure according to the third aspect, wherein one high-frequency heating coil spacer mounting structure is provided between the adjustment piece and the upper end surface of the spacer. Alternatively, a plurality of overlapping thin plates are provided.

[0015]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a perspective view of an embodiment of a spacer for a high frequency heating coil according to the present invention. 1 (b), 1 (c) and 2 to 7 are drawings for explaining one embodiment of the spacer mounting structure of the present invention, and FIG. 1 (b) is a front explanatory view, 1 (c) is a sectional view taken along the line AA of FIG. 1 (b), FIG. 2 is a partially transparent perspective view, FIG. 3 is a front view of the adjustment piece, and FIG. 4 is a line BB of FIG. FIG. 5 is a sectional view taken along the arrow, FIG. 5 is a front view of the adjustment piece, FIG. 6 is a perspective view of a backup guide, and FIG. 7 is a partial perspective view of a coil side plate.

As shown in FIG. 1A, the high-frequency heating coil spacer 10 of this embodiment (hereinafter referred to as a spacer 10) is formed in a U-shape. That is, a rectangular parallelepiped projection 16 and a projection 17 are formed on one end 11 and the other end 13 of the spacer 10 having the width H in a direction perpendicular to the direction connecting the one end 11 and the other end 13, respectively. An oval-shaped opening 14 is formed in a plate-shaped central portion 12 between the one end 11 and the other end 13. The tip 15 of the other end 13, the lower surface of the protrusion 17, and the lower portion of the tip of the protrusion 17 contact the work W. The lower end of the tip is rounded in accordance with the shape of the workpiece W with which it comes into contact.

The mounting structure of the spacer for the high-frequency heating coil of this embodiment has an adjusting piece 20 for adjusting a gap length between the work W shown in FIG. 1B and a heating coil (not shown), and this gap length. The backup guide 30 has a spacer 10 that can be moved up and down for adjustment, and a bolt 40 that fastens and fixes the adjustment piece 20 and the spacer 10 to the backup guide 30. The details will be described below.

As shown in FIG. 7, the coil side plates 90A and 90B are arranged in parallel and face each other, and a heating coil (not shown) is provided in the space S between the coil side plates 90A and 90B. Supported by. Rectangular openings 91 are formed near the work-side ends 92, 92 of the coil side plates 90A, 90B, and the thickness t is lower than the opening 91 of the coil side plates 90A, 90B. , 90B, which is thinner than the thickness T of 90B, and is formed in the adjustment piece mounting portion 96 provided with a circular through hole 95. Further, a pair of countersunk holes 93, 93 are formed through both sides of the adjustment piece mounting portion 96.

As shown in FIG. 6, the backup guide 30 is provided with a groove 31 having substantially the same width as the width dimension H of the spacer 10 over the entire length thereof. 32 are provided, and screw holes 34 are provided in the convex veins 33 formed on both sides by forming the groove 31.

As shown in FIGS. 1C and 2, the backup guide 30 is arranged in the space S between the coil side plates 90 A and 90 B. Since the coil side plate 90B is not shown in FIGS. 1 (c) and 2, only the mounting of the spacer 10 on the coil side plate 90A will be described below, but the mounting of the spacer 10 on the coil side plate 90B will be described. Is also the same.

The backup guide 30 inserts a bolt 94 into the countersunk screw hole 93 provided in the coil side plate 90 A and the screw hole 34 provided in the convex vein 33 of the backup guide 30 to screw the bolt 94 into the space S. It is fixed inside the coil side plate 90A. Further, the spacer 10 is arranged in the groove 31 of the backup guide 30 such that the direction connecting the one end 11 and the other end 13 of the spacer 10 coincides with the direction of the groove 31. An adjusting piece 20 is disposed between the protrusion 16 at one end 11 and the protrusion 17 at the other end 13 of the spacer 10 disposed at.

Then, the adjusting piece 20 and the spacer 10 pass through the through hole 20 c formed in the central portion of the adjusting piece 20 and the opening 14 of the spacer 10 to be screwed into the screw hole 32 of the backup guide 30. It is fixed to the backup guide 30 by a bolt 40 that is inserted and screwed.

As shown in FIG. 1C, the bolt 40 has a head portion 41 and leg portions 42. The dish-shaped head 41 is formed with a groove 43 into which the tip of a screwdriver used when turning the bolt 40 is inserted, and a screw 44 is formed at the tip of the leg 42. The diameter of the opening 14 of the spacer 10 is larger than the diameter of the leg portion 42 of the bolt 40 by at least the adjustment width of the gap length between the heating coil and the work W.

The detailed structure of the adjusting piece 20 will be described below. As shown in FIGS. 3 and 4, the tubular adjustment piece 20 includes a large-diameter portion 20a formed in an octagonal shape, and a cylindrical small-diameter portion 20b integrally formed with the large-diameter portion 20a. The adjusting piece 20 is provided with a through hole 20c. The through hole 20c includes a hole 20d having a shape corresponding to the head 41 of the bolt 40 and a hole 20e having a shape corresponding to the leg portion 42 of the bolt 40. The outer diameter of the small diameter portion 20b of the adjusting piece 20 is made equal to the diameter of the opening 95 of the coil side plates 90A and 90B.

The peripheral surface 20f of the large diameter portion 20a shown in FIG. 4 has an octagonal shape with eight sides 21 to 28 in the front view of the large diameter portion 20a shown in FIGS. 3 and 5. Has been formed. Then, as shown in FIG. 5, each side 21 to 28 and the center 29 of the octagon (the length of each side 21 to 28 is not the same, the octagon is not a regular octagon, but a regular octagon). The shortest distance from the center), that is, the lengths L1 to L8 of the perpendicular lines R1 to R8 drawn from the center 29 toward the sides 21 to 28 have the following relationships with each other. I have it.

That is, with L1 as a reference length, L2, L3, and L4 are respectively longer than L1 by 0.3 mm, 0.2 mm, and 0.1 mm, and L5 is equal to L1 and L6, L7 And L8 are shortened by 0.3 mm, 0.2 mm and 0.1 mm respectively with respect to L1. Then, in the vicinity of each of the sides 21 to 28, +0.3, +0.2, +0.1, 0, -0.3, -0.2, -0.1 are written, respectively. Therefore, the length of L1 + L5, the length of L2 + L6, the length of L3 + L7, and the length of L4 + L8 are all equal and equal to the distance D between the facing surfaces of the protrusions 16 and 17 of the spacer 10. There is.

As described above, and as shown in FIGS. 1 (b), 1 (c) and 2, the coil side plate 90A is backed up by the bolt 94 so that the groove 31 faces the outside of the space S. Although the guide 30 is attached, the spacer 10 arranged in the groove 31 of the backup guide 30 is inserted into the hole 20c of the adjustment piece 20 and also into the opening 14 of the spacer 10, and the tip The screw 44 is fixed to the backup guide 30 together with the adjustment piece 20 by a bolt 40 screwed into the screw hole 32 of the backup guide 30.

The length L1 of the perpendicular line R1 is selected so that the gap length between the heating coil (not shown) and the work W has a desired value. When the spacer 10 is exhausted and the gap length is shortened by 0.2 mm, for example, in order to increase the gap length by 0.2 mm, first loosen the bolt 40 and place the spacer 10 in the groove 31 at one end 11. And the other end 13 are slidable, that is, the adjustment piece 20 and the spacer 10 are loosely connected to the backup guide 30, and the adjustment piece 20 is attached to the adjustment piece 20. Separated from the portion 96, the bolt 40 is rotated about the bolt 40 to move the side 23 of the adjustment piece 20 to a position facing the upper surface of the protrusion 17 of the spacer 10. When the bolt 40 is tightened again to fix the adjusting piece 20 and the spacer 10 to the backup guide 30 and the side 23 is brought into close contact with the upper surface of the protrusion 17, the gap length is increased by 0.2 mm.

In the present embodiment, an example in which the head length 20a of the adjusting piece 20 is formed in an octagonal shape to change the gap length between the work and the heating coil in seven steps has been described. However, by adopting an arbitrary polygon as the shape of the head 20a of the adjusting piece 20, the gap length can be changed over an arbitrary number of steps. In addition, the unit of change in the void length is 0.1 mm, but it is not limited to this, it may be an arbitrary unit of length, or the void length that changes at each stage may have different values. it can.

Next, another embodiment of the mounting structure of the high-frequency heating coil spacer of the present invention will be described. 8 to 13 are drawings for explaining another embodiment, FIG. 8A is a front explanatory view, and FIG. 8B is a cross-sectional view taken along the line AA of FIG. 8A. 9 is a perspective view of the adjustment piece, FIG. 10 is a front view of the adjustment piece, FIG. 11 is a perspective view of a guide, FIG. 12 is a perspective view of a spacer, and FIG. 13 (a) is a front view of a modified example of another embodiment. FIG. 13B is a cross sectional view taken along the line BB of FIG.

In the other embodiment, the structure is simpler than the mounting structure of the above-mentioned embodiment, and a spacer in which the bolt hole 98 of the conventional spacer 71 shown in FIG. 14 is oval can be used. .. That is, as shown in FIG. 12, the spacer 200 that can be used in the present embodiment is made of cemented carbide or ceramic and has a substantially rectangular parallelepiped end 201 and a substantially integrally formed end 201. The other end 202 has a trapezoidal shape. Two oblong holes 204 into which bolts for fixing the spacer 200 to the coil side plate are inserted are formed at one end 201, and the tip 203 of the other end 202 contacts the work W.

As shown in FIGS. 8 and 11, the mounting structure of the spacer for the high-frequency heating coil according to another embodiment has a pair of coil side plates 210A and 210B, an adjustment piece 220, and a pair of guides 230. It includes a spacer block 240, a pair of countersunk bolts 250, and a pair of countersunk nuts 260.

The quadrangular prism-shaped adjustment piece 220 shown in FIG. 9 is for adjusting the space length between a heating coil (not shown) and the work W, and is a pair of protrusions formed at both ends of the adjustment piece 220. The cylindrical protrusion 225 is rotatably attached to the coil side plates 210A and 210B.

Further, as shown in FIG. 11, the guide 230 has a groove 235 having substantially the same width as the width dimension of the spacer 200 over the entire length, and two grooves 235 penetrating the groove are approximately at the center of the groove 235. An opening 234 for inserting the flat head bolt 250 is provided. By forming the groove 235, a rectangular bottom portion 231 and a pair of convex veins 232 protruding from both ends of the bottom portion 231 are formed. The guide 230 is fixed so as to be embedded in the coil side plate 210A so that the upper surface of the bottom portion 231 is at the same level as the inner surface of the coil side plate 210A. A guide 230 having a similar structure is attached to the coil side plate 210B.

The coil side plate 210A has an opening (not shown) into which the dish bolt 250 is inserted, at a position corresponding to the opening 234 of the guide 230, and the coil side plate 210B has the above-mentioned opening. An opening (not shown) is provided in which the tip portion of the countersunk bolt 250 is inserted and which accommodates the countersunk nut 260 screwed to the countersunk bolt 250.

The pair of spacers 200 are respectively arranged in the grooves 235 of the guide 230, and the spacer block 240 having a rectangular parallelepiped shape is arranged between the pair of spacers 200 to keep the distance between the spacers 200 constant. And the two spacers 200 are pressed against the coil side plates 210A and 210B, respectively. The spacer block 240 has a pair of holes (not shown) into which the flat head bolt 250 is inserted.

Then, in order to fix the pair of spacers 200 and the spacer block 240 arranged between the pair of guides 230 between the coil side plates 210A and 210B, the above-mentioned opening of the coil side plate 210A and the guide 230 are fixed. A countersunk bolt 250 is inserted so as to penetrate the holes 234, the holes 204 of the spacer 200, the holes of the spacer block 240, and the holes of the coil side plate 210B. It is screwed. The diameter of the dish bolt 250 is smaller than the diameter of the opening 204 of the spacer 200. 251 is a groove formed on the end surface of the head of the flat head bolt 250, and the tip of the driver is inserted into the groove 251 when the flat head bolt 250 is tightened.

Hereinafter, the adjusting piece 220 described above will be described in detail. As shown in FIG. 9 and FIG. 10, the adjustment piece 220 is provided with a large-diameter portion 223 having a quadrangular prism shape, and the cylindrical protrusion 225 having a smaller diameter than the large-diameter portion 223 at both ends of the large-diameter portion 223. ing. These protrusions 225 are rotatably inserted into openings (not shown) of the coil side plates 210A and 210B. A groove 229 into which the tip of a driver is inserted when the adjustment piece 220 is rotated is formed on the end surface of the protrusion 225.

Since the peripheral surface of the large-diameter portion 223 has four planar peripheral surfaces, when viewed from the front of the adjustment piece 220, these peripheral surfaces have four sides 221 as shown in FIG. It is represented by ~ 224. The shortest distance between each side 221 to 224 and the center 228 of the quadrangle (the length of each side 221 to 224 is not the same, so the quadrangle is not a regular quadrangle, but the center when it is a regular quadrangle). That is, the respective lengths F1 to F4 of the perpendicular lines C1 to C4 drawn from the center 228 toward the respective sides 221 to 224 have the following relationships with each other.

That is, with F1 as a reference length, F2, F3, and F4 are made longer by 0.1 mm, 0.2 mm, and 0.3 mm, respectively, with respect to F1. However, the length F 1 of the perpendicular C 1 is selected so that the gap length between the heating coil (not shown) and the work W has a desired value.

When the spacer 200 is consumed and the gap length is shortened by, for example, 0.2 mm, first loosen the bolt 250 and set the spacer 200 into the groove of the guide 230 in order to lengthen the gap length by 0.2 mm. The spacer 200 is slidably connected to the guide 230 so that it can slide in the direction connecting the one end 201 and the other end 202 of the spacer 200 in the 235, and the driver or the like is attached to the adjustment piece 220. Inserting it into the groove 229 formed on the end face of the protrusion 225 and rotating the adjustment piece 220, move the side 223 to a position facing the upper end face of the spacer 200 (end face 201a of the one end 201 shown in FIG. 12), When the upper end surface of the spacer 200 is brought into close contact with the peripheral surface of the adjustment piece 220 corresponding to the side 223, the countersunk bolt 250 and the countersunk nut 260 are refastened to fix the spacer 200 and the spacer block 240 to the guide 230. , The void length has increased by 0.2mm

In the other embodiment described above, the large-diameter portion 223 of the adjusting piece 220 is formed into a quadrangular prism shape so that the gap length between the work W and the heating coil is changed in three steps. As described above, the gap length can be changed over any number of steps by adopting an arbitrary polygonal column for the shape of the large diameter portion 223 of the adjusting piece 220 instead of sticking to three. Although the unit of the void length is 0.1 mm, the unit is not limited to this, and the unit of any length can be used, or the void length that changes at each stage can be set to a different value. it can.

Next, a modified example of the other embodiment described above will be described. FIGS. 13A and 13B correspond to FIGS. 8A and 8B, respectively. As shown in FIG. 13, the mounting structure for the high-frequency heating coil spacer of this modified example is different from the mounting structure for the high-frequency heating coil spacer of the other embodiment described above only in the following points, and the other structures are the same. Therefore, only the differences will be explained.

In this modified example, one or a plurality of thin plates 270 are inserted between the adjustment piece 220 and the upper end surface of the spacer 200. When assembling a heating coil, coil side plates, spacers, etc. to assemble a heating coil body, a plurality of such thin plates 270 are provided, and the number of these thin plates 270 is adjusted according to the required air gap length. Since there are more opportunities to commonly use coil side plates and spacers, it is possible to contribute to cost reduction of the heating coil body. Of course, it goes without saying that the adjustment piece 220 can be used to cope with the wear of the spacer 200.

[0045]

[Effect of the device]

 As described above, the spacer for the high-frequency heating coil of the present invention has one end attached to the coil side plate and the other end contacting the workpiece, and the one end having a protrusion in a direction substantially perpendicular to the direction connecting the one end and the other end. Have.

A mounting structure for a spacer for a high frequency heating coil according to claim 2 of the present invention is a mounting structure for mounting the spacer on a coil side plate, the spacer being disposed between a protrusion at one end of the spacer and the other end thereof. A polygonal adjustment piece having a through hole, a backup guide that holds the spacer slidably in the direction connecting the one end and the other end, and is fixed to the coil side plate, a through hole of the adjustment piece, and an opening provided in the spacer. The adjustment piece is fixed to the backup guide through the spacer and has a bolt with a diameter smaller than the diameter of the opening.The polygon of the adjustment piece has the shortest distance between the center of the polygon and each side. The distance is set to a predetermined value for each side, and the adjustment piece is rotated so that the bolt is loosened and the side corresponding to the desired void length is brought into close contact with the surface on the other end side of the protrusion. And before the spacer After moving in the indicated direction, the bolt is tightened to obtain the desired gap length.

Therefore, when the spacer for high-frequency heating coil of the present invention is attached to the coil side plate by the attachment structure according to claim 2, even if the kind of work is changed, the heating coil can be removed from the coil side plate. The desired air gap length between the work and the heating coil can be obtained by a simple operation within a short time, and there is no need to measure and confirm the air gap length obtained. It has the convenience of being able to visually check the void length without using tools or measuring instruments.

According to a third aspect of the present invention, the spacer mounting structure for a high-frequency heating coil has a structure in which the gap length between the high-frequency heating coil mounted on the pair of coil side plates and the work is kept at a predetermined value. In a mounting structure of a pair of high-frequency heating coil spacers, one end of which is attached to the coil side plate and the other end of which contacts the work piece, both ends of which are disposed between the pair of coil side plates and are rotated by the pair of coil side plates. An adjustable piece having a polygonal cross section, a pair of guides fixed to the coil side plates and slidably holding the spacer in a direction connecting the one end and the other end, and a pair of spacers. Spacer blocks that are arranged between the spacer blocks to keep the distance between the spacers constant, and a pair of coil side plates, guides, and spacers that are held by the guides and have a diameter smaller than the diameter of the holes formed in the spacers. And a bolt penetrating through an opening provided in each of the spacer blocks, the polygon of the shape of the adjustment piece has a shortest distance between the center of the polygon and each side, Is set to a value, the bolt is loosened, and the adjustment piece is turned so that the side corresponding to the desired gap length faces the end face at one end of the spacer, and the spacer is moved in the direction to move the spacer. The end face at one end is brought into close contact with the adjustment piece, and then the bolt is tightened to obtain the desired gap length.

Therefore, according to the mounting structure of the spacer for the high-frequency heating coil according to claim 3, when the spacer is worn and the gap length between the work and the heating coil is changed, or the type of work is changed. Even if it is necessary to change the air gap length, the desired air gap length between the work and the heating coil can be obtained by a simple work within a short time without removing the heating coil from the coil side plate. There is no need to actually check the void length obtained, that is, it is convenient to visually check the void length without using a dedicated tool or measuring instrument.

The mounting structure for the high-frequency heating coil spacer according to claim 4 is the same as the mounting structure for the high-frequency heating coil spacer according to claim 3, in which one spacer is provided between the adjustment piece and the upper end surface of the spacer. Or a plurality of overlapping thin plates are provided.

Therefore, according to the mounting structure of the spacer for a high-frequency heating coil according to claim 4, not only can the advantages of the mounting structure of the spacer for a high-frequency heating coil according to claim 3 be enjoyed, but the heating coil, the coil When assembling the side plates and spacers and assembling them as a heating coil, by adjusting the number of thin plates according to the required air gap length, the coil side plates, spacers, etc. can be individually adjusted to the air gap length. Since the opportunities for common use without being replaced increase, it can contribute to the cost reduction of the heating coil body.

[Brief description of drawings]

FIG. 1 (a) is a perspective view of an embodiment of a spacer of the present invention, FIG. 1 (b) is a front explanatory view of an embodiment of a spacer mounting structure of the present invention, and FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a partially transparent perspective view of an embodiment of a spacer mounting structure of the present invention.

FIG. 3 is a front view of an adjusting piece of an embodiment of a spacer mounting structure of the present invention.

4 is a sectional view taken along the line BB of FIG.

FIG. 5 is a front explanatory view of an adjusting piece of one embodiment of the spacer mounting structure of the present invention.

FIG. 6 is a perspective view of a backup guide according to an embodiment of a spacer mounting structure of the present invention.

FIG. 7 is a partial perspective view of a coil side plate of an embodiment of a spacer mounting structure of the present invention.

FIG. 8 (a) is a front explanatory view of another embodiment of the spacer mounting structure of the present invention, and FIG. 8 (b) is A- of FIG. 8 (a).
It is an A line arrow cross section explanatory view.

FIG. 9 is a perspective view of an adjusting piece of another embodiment of the spacer mounting structure of the present invention.

FIG. 10 is a front view of an adjusting piece of another embodiment of the spacer mounting structure of the present invention.

FIG. 11 is a perspective view of a guide according to another embodiment of the spacer mounting structure of the present invention.

FIG. 12 is a perspective view of a spacer according to another embodiment of the spacer mounting structure of the present invention.

13 (a) and 13 (b) are views showing a modified example of another embodiment of the spacer mounting structure of the present invention.
It is drawing corresponding to (a) and (b).

FIG. 14 is a perspective view of a spacer of a first conventional example.

FIG. 15 is an explanatory diagram of a spacer mounting structure of a first conventional example.

FIG. 16 is a perspective view of a spacer of a second conventional example.

FIG. 17 is an explanatory diagram of a spacer mounting structure of a second conventional example.

[Explanation of symbols]

 10 Spacer 11 One end 13 Other end 14 Open hole 16 Protrusion 20 Adjustment piece 21 to 28 sides 30 Backup guide 40 Bolt 90A, 90B Coil side plate W Work 200 Spacer 201 One end 202 Other end 210A, 210B Coil side plate 220 Adjustment piece 230 Guide 234 Open Hole 240 Spacer block 250 Countersunk bolt 260 Countersunk nut

Claims (4)

[Scope of utility model registration request] 1. A gap length between a high-frequency heating coil attached to a coil side plate and a work is kept at a predetermined value.
A spacer for a high-frequency heating coil, one end of which is attached to the coil side plate and the other end of which comes into contact with a workpiece, and which has a protrusion at the one end in a direction substantially perpendicular to a direction connecting the one end and the other end. 2. The air gap length between the high frequency heating coil attached to the coil side plate and the work is maintained at a predetermined value.
A mounting structure for a high-frequency heating coil spacer, wherein one end is attached to the coil side plate and the other end contacts a work, and the one end has a protrusion in a direction substantially perpendicular to a direction from the one end to the other end, A polygonal adjustment piece provided between one end of the spacer and the other end of the spacer and having a through hole; and a spacer that slidably holds the spacer in a direction connecting the one end and the other end and is fixed to the coil side plate. Backup guide, and a bolt having a diameter smaller than the diameter of the opening and penetrating through the through hole of the adjustment piece and the opening provided in the spacer to fix the adjustment piece to the backup guide through the spacer. As for the polygon of the shape of the adjustment piece, the shortest distance between the center of the polygon and each side is set to a predetermined value for each side, and the bolt is loosened to correspond to the desired gap length. Shi Turn and said spacer said adjusting piece so as to contact an edge on a surface of the other end of the protrusion from moving in the direction,
A structure for mounting a spacer for a high frequency heating coil, wherein a desired gap length is obtained by tightening the bolt. 3. A pair of coils, one end of which is attached to the coil side plate and the other end of which contacts the work so as to maintain the gap length between the high frequency heating coil attached to the pair of coil side plates and the work at a predetermined value. In the mounting structure of the spacer for high-frequency heating coil, the adjustment piece having a polygonal cross section, which is disposed between the pair of coil side plates and has both ends rotatably attached to the pair of coil side plates, A pair of guides which are slidably held in a direction connecting one end and the other end and are fixed to the coil side plates, and spacer blocks which are arranged between the pair of spacers and keep a distance between the spacers constant. , A hole having a diameter smaller than that of the opening provided in the spacer and penetrating the openings provided in each of the pair of coil side plates, the guide, the spacer held by the guide, and the spacer block. The shape of the adjustment piece is such that the shortest distance between the center of the polygon and each side is set to a predetermined value for each side, and the adjustment piece is loosened by loosening the bolt. Turn the spacer so that the side corresponding to the desired gap length faces the end face of one end of the spacer, move the spacer in the direction to bring the end face of the one end of the spacer into close contact with the adjustment piece, and then tighten the bolt. By so doing, the desired length of the air gap can be obtained, and a mounting structure for a spacer for a high-frequency heating coil. 4. Between the adjusting piece and the upper end surface of the spacer, 1
The structure for mounting a spacer for a high frequency heating coil according to claim 3, wherein a plurality of individual or overlapping thin plates are provided.