Heating device

Abstract

To provide a heating device which can heat an object to be heated efficiently and evenly, and which has high cleanliness.SOLUTION: A heating device includes: a base member 40; a cylindrical covering member 20 for defining a closed storage space Sp for storing an object to be heated W in cooperation with the base member 40; and a plurality of ring-like light sources 50 held by the covering member 20, for radiating light for heating the object to be heated provided in the vertical direction so as to surround an outer peripheral surface of the object to be heated. A cylindrical inner wall surface of the covering member 20 includes a reflection surface 20a for reflecting the light from the plurality of ring-like light sources toward the side of the object to be heated. At an end part of the base member 40, a supply nozzle 80 is provided for circulating a clean gas along the reflection surface 20a of the covering member 20, and at a ceiling part of the covering member 20, an exhaust port 20h is formed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heating device that efficiently and uniformly heats a cylindrical object to be heated. [Background technology]

[0002] In Patent Document 1, the applicant discloses a heating device comprising: a base member that supports an object to be heated; a cylindrical covering member that is arranged to be movable in the vertical direction relative to the base member, has an open lower end and a ceiling portion, and cooperates with the base member to define a closed storage space that stores the object to be heated; and a plurality of ring-shaped light sources that are held by the covering member and arranged in the vertical direction to surround the outer circumferential surface of the object to be heated, and that radiate light to heat the object to be heated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7236174 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned heating device, the cylindrical inner wall surface of the covering member is provided with a reflective surface that reflects light from the multiple ring-shaped light sources toward the object to be heated, and this reflective surface is formed, for example, by a mirror surface obtained by mirror-finishing the inner wall surface of the covering member. However, when an object to be heated is heated, outgassing from the object may adhere to the reflective surface of the covering member, which may reduce the heating efficiency.Furthermore, particles formed by the accumulation of outgassing from the object may adhere to the object and contaminate it.

[0005] An object of the present invention is to provide a heating device that can efficiently and uniformly heat an object to be heated and that is highly clean. [Means for solving the problem]

[0006] The heating device of the present invention comprises: a base member for supporting an object to be heated; a cylindrical covering member that is provided so as to be movable relative to the base member in the up-down direction, has an open lower end, a ceiling portion, and cooperates with the base member to define a closed storage space that accommodates the object to be heated; A plurality of ring-shaped light sources are held by the covering member and arranged in the vertical direction so as to surround the outer circumferential surface of the object to be heated, and emit light for heating the object to be heated, a cylindrical inner wall surface of the covering member having a reflective surface that reflects light from the plurality of ring-shaped light sources toward the heated object; a clean gas supply mechanism for circulating a clean gas along a reflective surface of the covering member is provided at one of the vertical ends of the covering member and the base member; An exhaust port is formed at the other vertical end of the covering member and the base member.

[0007] Preferably, a flow straightening plate is provided in front of the exhaust port to allow the clean gas to flow laterally into the exhaust port.

[0008] The heating device of the present invention further comprises a light-shielding member provided on an inner wall surface of the covering member and configured to block light from entering between two adjacent ring-shaped light sources among the plurality of ring-shaped light sources, The light blocking member has a flow hole formed therein through which the clean gas supplied from the clean gas supply mechanism flows.

[0009] Preferably, the exhaust port is formed in the center of the ceiling portion of the covering member, The rectifying plate is formed in a circular plate shape having a diameter larger than that of the object to be heated.

[0010] More preferably, the clean gas flows into the exhaust port through a gap formed between the ceiling portion of the covering member and the straightening plate. [Effects of the Invention]

[0011] According to the present invention, a heating device that can efficiently and uniformly heat an object to be heated and has a high degree of cleanliness can be obtained. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a longitudinal cross-sectional view of a heating device according to an embodiment of the present invention. [Figure 2] 2 is a vertical cross-sectional view showing a state in which a covering member of the heating device in FIG. 1 is raised. FIG. [Figure 3] 3 is a cross-sectional view of the covering member of the heating device of FIG. 2 taken along line AA. [Figure 4A] FIG. [Figure 4B] FIG. 4B is a top view of the heated object of FIG. 4A. [Figure 5] FIG. 10 is a longitudinal sectional view of a heating device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, a heating device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a heating device according to one embodiment of the present invention, FIG. 2 shows the heating device in an open state, and FIG. 3 shows a cross-sectional view of a covering member 20 of the heating device 10 of FIG. 1 taken along line AA. The heating device 10 has a base member 40 that supports the object to be heated W, a covering member 20 that covers the object to be heated W supported by the base member 40, a plurality of ring-shaped light sources 50 that emit light to heat the object to be heated W, a light-shielding member 30 that blocks the light emitted by the plurality of ring-shaped light sources 50, and a plurality of supply nozzles 80 that supply clean gas CG.

[0014] The covering member 20 is a cylindrical member having a ceiling portion 20c and an open lower end. The covering member 20 defines a storage space Sp for storing the object to be heated W, in cooperation with its cylindrical inner wall surface 20a, a ceiling surface 20b that is the lower surface of the ceiling portion 20c, and the base member 40. The covering member 20 is formed of a heat-resistant metal material, and the cylindrical inner wall surface 20a is mirror-finished to reflect light emitted from the ring-shaped light source 50. In this embodiment, the cylindrical inner wall surface 20a is a mirror-finished reflective surface, but this is not limited thereto. A reflective film can also be formed on the cylindrical inner wall surface 20a by vapor deposition or the like. The ceiling surface 20b can also be a reflective surface by mirror-finishing or the like, or it can be a non-reflective surface. 1 and 2, the covering member 20 can be moved up and down relative to the base member 40 by a lifting mechanism (not shown). Note that the base member 40 can also be moved up and down relative to the covering member 20.

[0015] The covering member 20 has an exhaust port 20h formed in the center of the ceiling portion 20c, and this exhaust port 20h is connected to an exhaust pipe 21. The gas G in the accommodation space Sp can be exhausted to the outside through the exhaust port 20h and the exhaust pipe 21.

[0016] The plurality of ring-shaped light sources 50 are arranged at predetermined intervals in the vertical direction inside the cylindrical inner wall surface 20a. As shown in FIG. 3, each of the multiple ring-shaped light sources 50 has a ring-shaped filament (not shown) that emits light inside a transparent glass tube 51 consisting of a ring-shaped portion 52 and straight portions 53 connected to both ends of the ring-shaped portion 52. A power supply wiring 55 connected to an end of a filament (not shown) is inserted into the straight portion 53 of the glass tube 51. The power supply wiring 55 is electrically connected to a power supply device (not shown). The straight portion 53 passes through the cylindrical wall portion of the covering member 20 and is fixed to and supported by the wall portion. In this embodiment, each of the multiple ring-shaped light sources 50 is a halogen lamp in which halogen gas is sealed inside a glass tube 51. A halogen lamp uses a filament 54 made of tungsten, nichrome wire, or the like, which is heated by passing electricity through it and radiating light (the wavelength of this light is electromagnetic waves in the near-infrared to visible range). It is also possible to use light sources such as far-infrared lamps, xenon lamps, and lasers. Halogen lamps have advantages such as a relatively high conversion efficiency to radiant energy, easy output control, and the ability to reduce the size and cost of the power supply device. When using nichrome wire, for example, as the light source, it is also possible to adopt a configuration in which the light source is not covered by the glass tube 51.

[0017] As shown in Figures 1 and 2, the multiple light-blocking members 30 consist of a plurality of ring-shaped light sources 50 arranged at intervals in the vertical direction, and include those arranged between two adjacent ring-shaped light sources 50, 50 in the vertical direction, one arranged above the ring-shaped light source 50 arranged at the top of the multiple ring-shaped light sources 50, and one arranged below the ring-shaped light source 50 arranged at the bottom of the multiple ring-shaped light sources 50. The light blocking member 30 is fixed to the cylindrical inner wall surface 20a of the covering member 20. There are various fixing methods, such as welding or fastening with bolts, and the most suitable fixing method can be adopted as appropriate, but detailed description thereof will be omitted. 3, the light-blocking member 30 is made of an annular disk with a plurality of slits 30s formed at predetermined angular intervals, extending radially from the inner circumferential circle toward the outer circumferential circle. The light-blocking member 30 is made of a heat-resistant material such as ceramic or metal, and serves to block light from the ring-shaped light source 50. The plurality of slits 30s serve to prevent deformation of the light-blocking member 30 when the light from the ring-shaped light source 50 causes the light-blocking member 30 to thermally expand due to an increase in temperature. Furthermore, a plurality of circulation holes 30a are formed at equal intervals along the circumferential direction of the light blocking member 30. As will be described later, the circulation holes 30a are formed so that the clean gas CG supplied from the supply nozzle 80 flows upward through the circulation holes 30a.

[0018] The multiple (three) light blocking members 30 arranged between two adjacent ring-shaped light sources 50, 50 in the vertical direction serve to prevent light from entering from one side to the other side between the two adjacent ring-shaped light sources 50, 50. In other words, they block the mutual incidence of light between the two adjacent ring-shaped light sources 50, 50. The light-shielding member 30, which is arranged above the ring-shaped light source 50 arranged at the top of the multiple ring-shaped light sources 50, is provided mainly to prevent overheating of the ceiling portion of the covering member 20 by blocking the light emitted from the ring-shaped light source 50 arranged at the top. The light-blocking member 30, which is arranged even further below the ring-shaped light source 50 arranged at the bottom among the multiple ring-shaped light sources 50, is provided mainly to prevent overheating of the base member 40 by blocking the light emitted from the ring-shaped light source 50 arranged at the bottom. The structure of the light blocking member 30 is not limited to that of this embodiment, and various modes can be adopted as long as they have a light blocking function.

[0019] The base member 40 is formed of a heat-resistant metal material, and has a recess 41 and an upper end surface 40a that abuts against the lower end surface 20e of the covering member 20. The recess 41 of the base member 40 is provided with a plurality of support pins 45 for supporting the object to be heated W, a light source 60 as a heating mechanism for heating the object to be heated W from the bottom, and a plurality of supply nozzles 80 arranged on the same circumference. The plurality of support pins 45 have their tips protruding upward from the upper end surface 40a of the base member 40 in order to facilitate automatic loading and unloading of the object to be heated W. The multiple light sources 60 are formed linearly, but have a structure basically similar to that of the ring-shaped light source 50. Both end portions 61, which are non-heated portions, are supported by the wall portions of the base member. Note that although the multiple light sources 60 are linearly shaped, this is not limitative and other shapes can also be adopted. Power is supplied to the multiple light sources 60 from a power supply device via power supply wiring (not shown). When the covering member 20 descends and the lower end surface 20e of the covering member 20 abuts against the upper end surface 40a of the base member 40, the opening at the lower end of the covering member 20 is closed, and the accommodation space Sp is isolated from the outside.

[0020] The supply nozzle 80h is provided to penetrate the lower end of the base member 40, and the supply nozzle 80h is supplied with clean gas CG from the outside. The supply nozzle 80h is directed upward so that the clean gas CG flows along the cylindrical inner wall surface 20a and the ceiling surface 20b of the covering member 20. The supply nozzles 80h are preferably arranged at positions corresponding to the flow holes 30a formed in the light-shielding member 30, which will be described later. The clean gas CG flows along the cylindrical inner wall surface 20a and the ceiling surface 20b of the covering member 20 while the object to be heated W is being heated, thereby preventing outgassing from the object to be heated W from adhering to the reflective surfaces of the cylindrical inner wall surface 20a and the ceiling surface 20b. As the clean gas CG, for example, an inert gas or air is used, and it is preferable that the temperature of the clean gas CG is adjusted so as not to affect the uniform heating of the object W to be heated.

[0021] A metal rectifying plate 22 is provided at the entrance (front) of the exhaust port 20h of the covering member 20. The rectifying plate 22 is made of a circular plate with an outer diameter larger than the outer diameter of the object to be heated W. This rectifying plate 22 is provided so as to form a gap Gp between it and the ceiling portion 20c of the covering member 20. The gas G in the accommodation space Sp flows into the exhaust port 20h through this gap Gp. In other words, the gas G in the accommodation space Sp flows into the exhaust port 20h from the side, not from the front of the exhaust port 20h. The gas G includes the clean gas CG and outgas generated from the object W to be heated.

[0022] The plurality of ring-shaped light sources 50 and the plurality of light sources 60 are controlled by a power supply device (not shown), and the output of each is controlled independently.

[0023] 4A and 4B show an example of the object to be heated W. FIG. The object to be heated W includes a motor core 300 formed by stacking a predetermined number of annular thin steel plates, and a holding jig 200 for holding the motor core 300. When a predetermined number of annular thin steel plates are stacked, the predetermined number of thin steel plates define cylindrical outer peripheral surface 300a of motor core 300. Furthermore, support pillar 202, which is provided perpendicularly to rectangular metal support plate 201 of holding jig 200, is inserted and fitted into a through hole in the center of the predetermined number of stacked annular thin steel plates, and motor core 300 is supported by support plate 201. The motor core 300 has a plurality of magnet insertion holes (not shown) near its outer periphery. After inserting magnets into these holes, the magnet insertion holes are filled with resin, which is then cured to fix the magnets in place. As described above, before this resin filling step, a preheating step is required in which the motor core 300 is heated to a predetermined temperature. The heating device 1 is used for this preheating step.

[0024] As shown in Figure 3, the cylindrical outer surface 300a of the motor core 300 of the object to be heated W and the support pillar 202 of the holding jig 200 are concentrically arranged with the cylindrical inner wall surface 20a of the covering member 20, the multiple ring-shaped light sources 50, and the light-shielding member 30. As shown in FIG. 1, the plurality of ring-shaped light sources 50 are arranged so as to be able to heat the cylindrical outer peripheral surface 300a of the motor core 300 of the object W to be heated from the upper end to the lower end.

[0025] Next, an example of the procedure for the preheating step of the object to be heated W by the heating device 10 will be described. 2, the covering member 20 is raised upward relative to the base member 40. At this time, it is assumed that power has already been supplied to the plurality of ring-shaped light sources 50 and the plurality of light sources 60 from the power supply device 100, and that the plurality of ring-shaped light sources 50 and the plurality of light sources 60 are emitting light for heating.

[0026] Next, the object to be heated W is placed on the support pins 45 of the base member 40 using a transport device such as a handling robot (not shown). 1, the covering member 20 in the raised state is then lowered so that the lower end surface 20e of the covering member 20 abuts against the upper end surface 40a of the base member 40. This closes the storage space Sp defined by the recesses of the covering member 20 and the base member 40.

[0027] Next, clean gas CG is supplied from the multiple supply nozzles 80. The supply amount of clean gas CG is set so that a large flow does not occur within the accommodation space Sp and temperature unevenness does not occur in the motor core 300, from the viewpoint of uniformly heating the motor core 300. The temperature of the clean gas CG is also set to a temperature that does not cause temperature unevenness in the motor core 300. The supplied clean gas CG flows upward through the flow holes 30a along the cylindrical inner wall surface 20a of the covering member 20, and when it reaches the ceiling portion 20c, it changes direction and flows horizontally, and flows horizontally into the exhaust port 20h through the gap Gp between the ceiling portion 20c and the straightening plate 22. The gas G in the accommodation space Sp, including the clean gas CG, can be discharged to the outside at a constant flow rate by connecting a pump to the exhaust pipe 21. Furthermore, if no pump is used, the gas G can be naturally discharged by utilizing the upward flow of gas whose temperature has risen due to heating.

[0028] Next, when heating begins, the multiple ring-shaped light sources 50 surround the cylindrical outer surface 300a of the motor core 300, so that some of the light emitted from the ring-shaped light sources 50 is radiated around the entire cylindrical outer surface 300a of the motor core 300. Of the light emitted from the ring-shaped light source 50, a portion of the light directed radially outward from the ring-shaped light source 50 is reflected toward the cylindrical outer peripheral surface 300a of the motor core 300 when it reaches the cylindrical inner wall surface 20a of the covering member 20, because the cylindrical inner wall surface 20a has a cylindrical shape. The light emitted from the light source 60 is mainly applied to the support plate 201 of the holding jig 200, and heats the holding jig 200. In this way, in the heating device 10, the light from the plurality of ring-shaped light sources 50 and light sources 60 is efficiently used to heat the motor core 300, so that the temperature of the motor core 300 can be increased quickly.

[0029] Here, an example of temperature control for making the temperature of the motor core 300 uniform will be described. Since the heat generated within the heating device 10 rises upward, the temperature of the atmosphere tends to become higher the further toward the upper side of the motor core 300. For this reason, it is necessary to independently adjust the output of the multiple ring-shaped light sources 50. In general, the output of the ring-shaped light sources 50 located higher is reduced, and the output of the ring-shaped light sources 50 located lower is increased. For example, it is possible to provide a temperature sensor capable of detecting the temperature of the motor core 300 non-contact within the heating device 10, feed back the detected temperature, and independently control the output of multiple ring-shaped light sources 50 so that the temperature of the motor core 300 becomes uniform. It is also possible to determine in advance through experiments or the like the output of each of the multiple ring-shaped light sources 50 required to make the temperature of the motor core 300 uniform, and then adjust the power supplied to the ring-shaped light source 50 according to this information.

[0030] When the motor core 300 is heated, outgassing occurs from the motor core 300. In this embodiment, it is assumed that the outgassing from the motor core 300 is lighter than air. As a result, the outgas from the motor core 300 is caught up in the clean gas CG rising along the cylindrical wall surface 20a of the covering member 20, carried upward, and after reaching the ceiling surface 20b, flows into the exhaust port 20h through the gap Gp and is discharged to the outside from the exhaust pipe 21 as gas G. Since clean gas CG constantly flows near the surfaces of cylindrical wall surface 20a and ceiling surface 20b, which are reflective surfaces, while motor core 300 is being heated, outgassing from motor core 300 toward cylindrical wall surface 20a and ceiling surface 20b, which are reflective surfaces, is blocked by clean gas CG, preventing the outgas from adhering to cylindrical wall surface 20a and ceiling surface 20b. As a result, the heating efficiency of multiple ring-shaped light sources 50 can be maintained at a high level.

[0031] If the straightening plate 22 is not positioned in front of the exhaust port 20h, air containing outgassing generated from the motor core 300 will be sucked directly into the exhaust port 20h, making it easier for the outgassing to swirl within the accommodation space Sp and reducing the thermal uniformity of the motor core 300. By disposing the current plate 22 in front of the exhaust port 20h, the air containing the outgas is prevented from swirling. By providing the straightening plate 22, the outgas is easily carried by the clean gas CG, facilitating the discharge of the outgas to the outside, and making it possible to suppress contamination of the cylindrical wall surface 20a and ceiling surface 20b, which are reflective surfaces. The current plate 22 suppresses the generation of vortexes in the accommodation space Sp, thereby suppressing the generation of stagnation in the region where the cylindrical wall surface 20a and the ceiling surface 20b intersect. Furthermore, by making the outer diameter of the rectifying plate 22 larger than the motor core 300, it is possible to prevent outgas deposits that accumulate around the exhaust port 20h from peeling off and adhering to the motor core 300. The current plate 22 also serves to stabilize the heat flow within the accommodation space Sp.

[0032] When the required heating of the object W (motor core 300) is completed, as shown in Fig. 2, the covering member 20 is raised to separate it from the base member 40, so that the object W can be removed. Then, using a transport device such as a handling robot (not shown), the object W is removed from above the support pins 45 of the base member 40 and sent to the resin filling process, and a new object W to be heated is carried in above the support pins 45 of the base member 40. By repeating these procedures, a large number of motor cores 300 can be heated in an assembly line.

[0033] According to this embodiment, the above-described configuration makes it possible to efficiently and uniformly heat the object W to be heated, including the motor core 300 and the holding jig 200, and also to prevent contamination of the object W to be heated.

[0034] In this embodiment, the object to be heated W is exemplified by a motor core 300 and a holding jig 200 that holds it, but the heating device of the present invention can be applied to any object to be heated that has a cylindrical outer peripheral surface.

[0035] In the above embodiment, the clean gas supply mechanism is exemplified by a case in which multiple supply nozzles 80 are arranged on the same circumference. However, in addition to this configuration, it is also possible to supply clean gas using, for example, an annular nozzle having a diameter slightly shorter than the diameter of the cylindrical wall surface 20a.

[0036] In the above embodiment, the exhaust port 20h and exhaust pipe 21 are provided in the ceiling portion 20c of the covering member 20, assuming that outgas from the heated object W flows from bottom to top. However, there may be cases where the outgas from the heated object W is heavier than air and does not rise upward with the airflow. In such cases, for example, as shown in FIG. 5, an exhaust port 40h is formed in the center of the lower end of the base member 40, and the exhaust pipe 21 is connected to it. Multiple supply nozzles 80 are arranged on the same circumference at the upper end of the covering member 20. By supplying clean gas CG downward from the supply nozzles 80, it is possible to prevent the outgas from adhering to the reflective cylindrical wall surface 20a, thereby preventing contamination of the heated object W.

[0037] The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0038] 10 Heating device 20 Covering material 20a Cylindrical inner wall surface 20b Ceiling surface 20c Ceiling section 21 Exhaust pipe 22 Rectifier plate 30 Light blocking member 30a Flow hole 30s slit Gp gap 40 Base member 50 Ring-shaped light source 51 Glass Tube 52 Ring-shaped part 53 Straight section 54 Power supply wiring 60 light source 80 supply nozzle 200 Holding jig 201 Support Plate 202 Support pillar 300 motor core 300a Cylindrical outer surface W Heated object G Gas CG Clean Gas

Claims

1. a base member that supports the object to be heated; a cylindrical covering member that is provided so as to be movable relative to the base member in the up-down direction, has an open lower end, a ceiling portion, and cooperates with the base member to define a closed storage space that accommodates the object to be heated; A plurality of ring-shaped light sources are held by the covering member and arranged in the vertical direction so as to surround the outer circumferential surface of the object to be heated, and emit light for heating the object to be heated, a cylindrical inner wall surface of the covering member having a reflective surface that reflects light from the plurality of ring-shaped light sources toward the heated object; a clean gas supply mechanism for circulating a clean gas along a reflective surface of the covering member is provided at one of the vertical ends of the covering member and the base member; The heating device further comprises an exhaust port formed at the other vertical end of the covering member and the base member.

2. The heating device according to claim 1 , further comprising a flow rectifier provided in front of the exhaust port to allow the gas in the accommodation space to flow laterally into the exhaust port.

3. a light-shielding member provided on an inner wall surface of the covering member and configured to block light from entering between two adjacent ring-shaped light sources among the plurality of ring-shaped light sources; The heating device according to claim 1 or 2, wherein the light blocking member has a flow hole through which the clean gas supplied from the clean gas supply mechanism flows.

4. the exhaust port is formed in the center of the ceiling portion of the covering member, The heating device according to claim 2 , wherein the current plate is formed in a circular plate shape having a diameter larger than that of the object to be heated.

5. The heating device according to claim 4 , wherein the clean gas flows into the exhaust port through a gap formed between the ceiling portion of the covering member and the straightening plate.

6. 2. The heating device of claim 1, wherein the clean gas is a temperature-controlled inert gas or air.

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