JP5828027B1 - Crucible support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate attachment / detachment of a crucible to / from a crucible support device. A body part 4 of a crucible 2 is inserted into a crucible insertion hole 36 of a crucible support part 18. The flange 10 formed around the upper end of the body 4 of the crucible 2 is in contact with the support surface 34 around the crucible insertion hole 36. A guide portion 28 that surrounds the periphery of the flange 10 and extends upward is formed on the upper surface of the crucible support portion 18. The tweezer tip insertion portion 60 is opened in the guide portion 28 along the thickness direction so that a contact portion to the outer surface of the tweezers that contacts and grips the outer surface and the inner surface of the flange 10 can pass therethrough. Is formed. [Selection] Figure 1

Description

  The present invention relates to a crucible support device for supporting a crucible in a metal melting apparatus for melting metal using a crucible.

  An example of a metal melting apparatus for melting metal with a crucible is disclosed in FIG. In Patent Document 1, the crucible is supported by a crucible support device. The crucible support device has a flat plate, a hole having a size that the outer peripheral surface of the flange of the crucible contacts is formed from the upper surface to the middle of the lower surface, from the bottom of the hole to the lower surface of the flat plate, A through hole through which the body of the crucible is inserted is formed. The crucible is supported by inserting the body portion into the through hole while keeping the outer peripheral surface of the flange along the peripheral surface of the hole, and the lower surface of the flange is in contact with the bottom of the hole.

JP 2001-179423 A

  In the technique of Patent Document 1, when the crucible is removed from the crucible support device after the metal melting in the crucible is completed, it is necessary to grip the flange with a crucible gripping tool such as tweezers and pull up the crucible. However, gripping the flange with the crucible gripping tool must be done in the hole, and the inner peripheral surface of the hole functions as a guide for the flange, so the outer peripheral surface of the flange and the inner peripheral surface of the hole Since there is only a slight gap between them, it is very difficult to grip the flange with the gripping tool.

  An object of this invention is to provide the crucible support apparatus which made it easy to take out a crucible after completion | finish of metal melting | dissolving.

  The crucible support device of one embodiment of the present invention has a crucible support portion. The crucible support part has an insertion hole through which the body part of the crucible passes. The trunk is a hollow body that contains metal inside. A flange formed around the upper end of the body of the crucible comes into contact with the support surface around the insertion hole. A guide portion is formed on the upper surface of the crucible support portion so as to surround the periphery of the flange of the crucible and extend upward. The guide portion is provided with at least one contact portion passage portion with an upper portion opened along the thickness direction. The contact part passage part is formed so that a contact part to the outer surface of the flange of the tweezers, for example, a gripper that comes in contact with and grips the outer surface and the inner surface of the flange can pass therethrough.

  In the crucible support device configured as described above, when supporting the crucible, the barrel portion can be passed through the insertion hole by lowering the outer peripheral surface of the flange along the inner peripheral surface of the guide portion. The crucible is supported by the flange contacting the support surface of the support portion. When removing the crucible from the support device, the contact part to the outer surface of the flange of the gripping tool comes into contact with the outer surface of the flange through the contact part passing part formed in the guide part. Can be easily grasped, and the crucible can be detached from the support device by pulling the crucible upward in the grasped state.

  The crucible support part can be arranged horizontally. In this case, the contact portion passage portion can be provided on the back side of a horizontal line passing through the center of the insertion hole when viewed from a position where the user who supports the crucible on the crucible support portion stands (user side position). . With this configuration, when the user at the user side grips the crucible with the gripping tool and removes the crucible from the crucible support device, the crucible naturally rises obliquely in the direction of the user's body, It becomes easy to lift.

  Further, the contact portion passage portion may be formed in parallel to a horizontal line passing through the center of the insertion hole without passing through the center of the insertion hole. With this configuration, the user does not need to twist the gripping tool so that the contact portion of the gripping tool faces the portion that contacts the crucible, and the crucible becomes difficult to slip from the gripping tool, so that the crucible can be reliably removed. Can do.

The contact portion passage portions can be provided on both the left and right sides in a plan view of the flange. Thus, when the contact part passage parts are provided on both the left and right sides, the crucible can be easily grasped regardless of whether the worker is right-handed or left-handed.

  Furthermore, each of the support surfaces in the vicinity of each of the contact portion passing portions may be provided with a protrusion protruding upward so as to contact the lower surface of the flange.

  If comprised in this way, since it will be in the state which the flange floated rather than the support surface, it can hold | grip with a holding tool easily.

Further, the crucible may be divided into two crucible forming members by a dividing surface passing through the central axis thereof. In this case, the contact part passage part is formed together with the protrusion corresponding to each of these crucible forming members . In addition, it is desirable to arrange a mold below the crucible forming member.

  If comprised in this way, since the crucible formation member is each supported by the protrusion, the lower part of a crucible formation member can be opened easily, and molten metal can be easily poured into the casting_mold | template under it.

  Furthermore, a part of the flange of the crucible forming member may be cut out. In this case, an overhanging portion complementary to the notch is provided on the inner surface of the guide portion corresponding to the notch.

  If comprised in this way, in the state by which the divided crucible formation member was supported by the protrusion, there will be no unnecessary rotation.

  As described above, according to the present invention, the crucible support device can be easily attached and removed easily.

It is a perspective view of a crucible support device of one embodiment of the present invention. It is a longitudinal cross-sectional view of the metal melting apparatus using the crucible support apparatus of FIG. It is a top view of the crucible support apparatus of FIG. It is a top view in the state where the crucible was supported on the crucible support device of FIG. It is a perspective view of the state which made the crucible support apparatus of FIG. 1 support the crucible. It is a perspective view which shows the state which removes a crucible from the crucible support apparatus of FIG. FIG. 2 is a plan view showing an insertion state of tweezers in the crucible support device of FIG. 1 and a plan view showing an insertion state of tweezers in the crucible support device provided with tweezer tip insertion portions different from the crucible support device of FIG. 1.

  The crucible support device of one embodiment of the present invention is provided in a metal melting device, and this metal melting device is used as a part of a denture casting device, for example. This metal melting apparatus has a crucible 2 as shown in FIG. The crucible 2 is divided and formed as will be described later, and the lower part thereof is configured to open outward. After melting of a metal, for example, a metal for producing a denture, the crucible 2 is opened and disposed below the crucible 2. The molten metal is dropped into a casting mold, for example, a casting mold (not shown) for manufacturing a denture, and cast.

  Specifically, as shown in FIG. 1, the crucible 2 has a body 4 formed in an inverted truncated cone shape having a hollow inside, and a metal for producing a denture as shown in FIG. 6 is accommodated, and the metal 6 is melted by high frequency induction heating as will be described later. The bottom 8 of the crucible 2 shown in FIG. 2 is located above the lower end of the crucible 2. For example, an annular flange 10 is formed on the periphery of the upper end of the body 4 of the crucible 2.

  The crucible 2 is divided into a plurality of, for example, two crucible forming members 2a and 2b by, for example, one dividing surface passing through the central axis in the vertical direction. The body 4 of the crucible forming member 2a is the body 4a, the flange 10 of the crucible forming member 2a is the flange 10a, the body 4 of the crucible forming member 2b is the body 4b, and the flange 10 of the crucible forming member 2b is the flange 10. This is referred to as the flange 10b. Inside the body parts 4a and 4b of the crucible 2, as shown in FIG. 2, the first inclined surfaces 12a and 12b are inclined from the flanges 10a and 10b toward the lower ends, and the lower ends of the first inclined surfaces 12a and 12b. The second inclined surfaces 14 a and 14 b are inclined downward toward the inner surfaces 8 a and 8 b of the bottom portion 8. The second inclined surfaces 14a and 14b are steeper than the first inclined surfaces 12a and 12b. The inner surfaces 8a and 8b of the bottom 8 have a planar shape as shown in FIG. When the crucible 2 is viewed from above, the inner surfaces 8a and 8b of the bottom 8 are long, in the present embodiment, a single rectangle, and the dividing surface passes through the center line of the long side of the rectangle. ing.

  If it does in this way, the volume of the metal accommodating part can be enlarged rather than making the inner surface bottom part of a crucible conical shape like the conventional crucible. Therefore, even when a large amount of metal is melted, the height position of the molten metal can be kept constant, and the metal is positioned at a dense height so that the metal flux can be melted efficiently, which will be described later. Can do.

  The metal melted in the crucible 2 accumulates in a rectangular shape on the bottom side, and accumulates in a conical shape as it goes upward. When the crucible 2 is opened in this state as described later, the molten metal moves from the relatively gentle first inclined surfaces 12a and 12b to the mold along the steeper second inclined surfaces 14a and 14b, In addition, in the vicinity of the inner surfaces 8a and 8b of the bottom 8 of the crucible 2, the metal spread along the long side of the rectangle falls into the mold at once, so that the casting time is smooth and smooth along the long side. Lime lag is unlikely to occur and metal can be uniformly cast into the mold.

  In this embodiment, the shapes of the inner surfaces 8a and 8b of the bottom 8 of the body 4a and 4b of the crucible 2 are rectangular. However, if the elongated shape has a long axis along the dividing surface of the crucible 2, For example, it may be oval. By making the shape of the inner surfaces 8a, 8b of the bottom portion 8 elliptical, the corner portions are eliminated from the shape of the inner surface 8a, 8b of the bottom portion 8 so that molten metal can be prevented from remaining in the corner portions. For the same reason, even if the inner surfaces 8a and 8b of the bottom 8 are rectangular with chamfered corners, the molten metal can be cast well. Depending on the shape of the crucible 2, one inclined surface and the inner surface of the bottom portion 8 can constitute the inside of the body portion of the crucible 2. If constituted by the second two inclined surfaces 12a, 12b, 14a, 14b, the volume in the body portion 4 of the crucible 2 can be secured while making the inclined surface for dropping the molten metal into the mold steep. In addition, since the inner circumference of the body 4 of the crucible 2 can be increased, the height of the metal 6 can be adjusted to substantially the same height even when a large amount of the metal 6 is introduced, and can be arranged at the center of the coil. The metal 6 can be efficiently melted.

  The crucible 2 is supported by the crucible support device 16 shown in FIG. The crucible support device 16 includes a flat crucible support portion 18 that is horizontally supported. An annular annular portion 20 is formed on the upper surface of the crucible support portion 18, and the inside of the annular portion 20 is formed on a surface 22 lower than the annular portion 20. An annular guard portion 24 protruding upward from the surface 22 is formed on the surface 22 concentrically with the annular portion 22. The guard portion 24 is formed with a through portion 26 penetrating inward and outward at predetermined intervals.

  A guide portion 28 is formed inside the guard portion 24. The guide portion 28 has a substantially annular shape in which the upper surface 30 extends from the inner peripheral surface of the guard portion 24 to the further inner position at the same height as the surface 22 and descends from the inner position to the same size as the outer peripheral surface of the flange 10. A guide surface 32 is provided, and an inner side from a lower end of the guide surface 32 is a bottom surface 34 of the guide portion 28. An insertion hole, for example, a crucible insertion hole 36 through which the body 4 of the crucible 2 can be inserted is formed in the bottom surface 34 so as to penetrate in the vertical direction. The crucible insertion hole 36 is also formed concentrically with the annular portion 22. The bottom surface 34 is located between the periphery of the crucible insertion hole 36 and the peripheral surface of the guide surface 32, and the depth thereof is substantially the same as the depth of the lower surface of the flange 10. As shown in FIG. 1, the crucible 2 is lowered from above the crucible support device 16, and the outer peripheral surfaces of the flanges 10 a, 10 b are lowered along the inner peripheral surface 32 of the guide portion 28. The portion 4 can be inserted into the crucible insertion hole 36. In a state where the crucible 2 is inserted into the crucible insertion hole 36, the crucible 2 is positioned substantially concentrically with the crucible insertion hole 36.

  A plurality of, for example, two projecting portions 38a and 38b are formed on the bottom surface 34 of the guide portion 28 so as to project upward at a predetermined angle, for example, an angle of 180 degrees. As shown in FIG. 3, these protrusions 38a and 38b are positioned on a horizontal straight line passing through the center of the crucible insertion hole 36 when viewed in plan. These protrusions 38a and 38b are formed in a flat rectangular shape, for example, and have substantially the same depth as the flanges 10a and 10bb, that is, the same depth as the bottom surface 34.

  The lower surface of the center of the flange 10a of the crucible forming member 2a is in contact with the upper surface of the protrusion 38a, and the lower surface of the center of the flange 10b of the crucible forming member 2b is in contact with the upper surface of the protrusion 38b. The crucible forming members 2a and 2b are supported by the flanges 10a and 10b coming into contact with the protrusions 38a and 38b. In this state, the flanges 10a and 10b are not in contact with the bottom surface 34 other than the protrusions 38a and 38b.

  In a state where the flanges 10a and 10b are in contact with the protrusions 38a and 38b, the crucible forming members 2a and 2b have their own weights, so that the forces rotating outwardly act on the lower portions thereof, and the crucible 2 is opened outward. It becomes a state. In a state where the crucible 2 is open, the crucible forming member 2a on the axes 40a, 40b passing through the portions located at the inner peripheral ends facing the crucible insertion holes 36 of the protrusions 38a, 38b in the vicinity of the roots of the flanges 10a, 10b, The center of gravity of 2b is located and the crucible 4 is kept open.

  In order to close the crucible forming members 2a, 2b in the open state, for example, a plate-like restraining member 42a, which can be moved back and forth in the inner and outer directions, on the outer side of the body portions 4a, 4b of the crucible forming members 2a, 2b, 42b is arranged. When these restraining members 42a and 42b are moved inward and their inner ends are in contact with the dents 44a and 44b formed at the lower portions of the body portions 4a and 4b, the crucible forming members 2a and 2b are opened. It is maintained in a closed state against a force rotating in the direction, and coincides with the dividing surface as shown in FIG. 2 and is completely closed. In this state, the restraining members 42a and 42b are kept horizontal.

  Further, when the restraining members 42a and 42b are retracted, the tips of the restraining members 42a and 42b are not in contact with the body portions 4a and 4b, and the lower portions of the crucible forming members 2a and 2b are opened outward as described above. ing. When the crucible 2 opens and closes, the vicinity of the roots of the flanges 10a and 10b rotates around the inner peripheral ends of the protrusions 38a and 38b.

  As described above, since the flanges 10a and 10b rotate around the narrow line, the friction can be reduced, and the crucible forming members 2a and 2b can rotate smoothly. There is no fear of riding on 34 or the protrusions 38a and 38b. Moreover, since the area of the protrusions 38a and 38b is small, the friction between the flanges 10a and 10b and the protrusions 38a and 38b is kept small, so that the crucible forming members 2a and 2b shift from the restrained state to the unrestrained state. In doing so, the crucible 2 can be opened immediately.

  In order to advance and retract these restraining members 42a and 42b, the lower ends of levers 47a and 47b forming part of the driving means are coupled to the outer ends of the restraining members 42a and 42b. The levers 47a and 47b are vertically arranged outside the crucible forming members 2a and 2b, the middle is rotatably supported by the shafts 46a and 46b, and the upper end is positioned outward from the lower end. Therefore, by rotating the levers 47a and 47b around the shafts 46a and 46b, the restraining members 42a and 42b rotate around the shafts 46a and 46b, and advance and retreat.

  In order to rotate these levers 47a and 47b, the outer walls 48a and 48b of the metal melting apparatus are provided with cylinders, for example, gas cylinders 50a and 50b, which form other parts of the driving means so as to face the upper ends of the levers 47a and 47b. The piston is attached to the upper ends of the levers 47a and 47b so as to advance and retract. Although not shown, for example, biasing means such as a spring spring is provided between the shafts 46a and 46b and the levers 47a and 47b, and the levers 47a and 47b are provided by the biasing means. Since the crucible forming members 2a and 2b are biased in the closing direction, the restraining members 42a and 42b come into contact with the depressions 44a and 44b below the crucible forming members 2a and 2b, and the crucible forming members 2a and 2b are closed. ing.

  Then, when the pistons of the gas cylinders 50a and 50b advance and push the upper ends of the levers 47a and 47b, the levers 47a and 47b rotate against the urging force of the urging means, and the restraining members 42a and 42b become crucibles. It moves in a direction away from the forming members 2a and 2b. Since the crucible forming members 2a and 2b are applied with a force that rotates in the opening direction by the protrusions 38a and 38b as described above, the crucible forming members 2a and 2b are opened when the restraining force of the restraining members 42a and 42b is lost. Rotate in the direction. Reference numeral 52 denotes a stopper for the levers 47a and 47b.

  In this metal melting apparatus, after the inside is evacuated to vacuum, the metal is melted in a state where an inert gas is supplied, so a gas source (not shown) and a vacuum source (not shown) are arranged. Using these, the pistons of the gas cylinders 50a and 50b are advanced and retracted. For example, when the piston is retracted and the levers 47a and 47b are rotated outward, the restraining members 42a and 42b come into contact with the crucible forming members 2a and 2b to close them, and the piston is advanced to move the levers 47a and 47b. Is rotated inward, the restraining members 42a, 42b can be rotated and opened in a direction away from the crucible forming members 2a, 2b. For example, when a gas source is connected to the gas cylinders 50a and 50b and the piston is moved forward to open the crucible forming members 2a and 2b, gas is supplied to the gas cylinder and the piston is moved backward to move the crucible forming members 2a and 2b. Is closed, the gas cylinders 50a and 50b are connected to a vacuum source. This connection can be switched by a switching valve.

  A high frequency induction heating coil 54 is disposed between the levers 47a and 47b so as to surround the outer periphery of the crucible forming members 2a and 2b. With the crucible forming members 2a and 2b closed by the restraining members 42a and 42b, the metal 6 is accommodated therein and a high frequency current is supplied to the high frequency induction heating coil 54, whereby the metal 6 is melted by high frequency induction heating. .

  In order to efficiently melt the metal, it is desirable that the magnetic flux generated by the high frequency induction heating coil 54 passes through the metal intensively. That is, a metal 6, for example, a metal of a standard size used in the manufacture of dentures is located in a place where the magnetic flux generated by the high frequency induction heating coil 54 is dense, that is, in the vertical center of the high frequency induction heating coil 54. It is desirable to do. As shown in FIG. 2, the metal 6 is supported in the crucible 2 by being supported by the inclined surface 14a above the lower end of the crucible 2, so that the distance from the lower end of the crucible 2 to the outer surface of the bottom 8, The distance from the outer surface to the inner surfaces 8a and 8b of the bottom 8 and the distance from the position where the metal 6 is in contact with the inclined surface 14a to the inner surfaces 8a and 8b of the bottom 8 are in the vertical direction of the high-frequency induction heating coil 54. It is determined that the metal 6 is located in the center. In this case, the metal 6 is of a standard size that is melted in this metal melting apparatus.

  At this time, since the inner ends of the plate-like restraining members 42a and 42b are in contact with the lower part of the crucible 2, that is, the restraining members 42a and 42b are located near the portion where the high-frequency induction heating coil 54 generates magnetic flux. Therefore, it is possible to arrange the metal 6 at a position where the metal 6 is accommodated, at a position inside the high frequency induction coil 54 where the high frequency induction coil 54 generates magnetic flux, particularly at a position where the magnetic flux is dense. It is. Furthermore, since the inclined surface 14a is formed, the thickness near the inclined surface 14a is the thickest. Therefore, the crucible forming members 2a and 2b formed of a relatively brittle material can be easily processed, and even if the crucible forming members 2a and 2b are in contact with a molten metal having a high temperature, they are not easily damaged.

  When the metal is melted, only one of the crucible forming members 2a, 2b is opened outward, or both are opened outward simultaneously, and the molten metal is cast into a mold.

  In the metal melting apparatus configured as described above, the crucible forming members 2a and 2b are supported by the protrusions 38a and 38b coming into contact with part of the flanges 10a and 10b. Is less than that in direct contact with the bottom surface 34 of the guide portion 28 and has less contact resistance. Therefore, when the restraint by the restraining members 42a and 42b is released, the crucible forming members 2a and 2b rotate smoothly.

  However, if only the support by the protrusions 38a and 38b is taken, the crucible forming members 2a and 2b may lose balance and rotate unnecessarily when the restraint by the restraining members 42a and 42b is removed. Therefore, the flanges 10a and 10b of the crucible forming members 2a and 2b are notched on the outer surfaces of the flanges 10a and 10b so as to straddle the split surfaces, thereby forming notch surfaces 56 and 56. As shown in FIG. 1, projecting portions 58 and 58 are formed on the inner peripheral surface 32 of the guide portion 28 so that the notched surfaces 56 and 56 come into contact with each other. These projecting portions 58 and 58 have shapes corresponding to the notched flanges 10a and 10b, and are in contact with the inner peripheral surface 32 of the guide portion 28 and have an angle of about 90 degrees with the protrusions 38a and 38b. It is formed to make. That is, the overhang portions 58 and 58 are provided in a direction orthogonal to the direction in which the crucible forming members 2a and 2b are opened. Therefore, when the crucible 2 is inserted into the crucible insertion hole 36, if the notched surfaces 56, 56 of the flanges 10a, 10b are aligned with the inner surfaces of the guides 30, 30, the movement of the crucible forming members 2a, 2b is restrained. When the crucible forming members 2a and 2b are opened, the crucible forming members 2a and 2b do not rotate unnecessarily.

  Further, since the levers 47a, 47b and the gas cylinders 50a, 50b are respectively located outside the crucible forming members 2a, 2b, when the crucible forming members 2a, 2b are opened and molten metal is cast into the mold, Bounced molten metal is difficult to adhere to these.

  Thus, after melting and casting of the metal 6 are completed, it is necessary to remove the crucible 2 from the crucible support device 18 and perform cleaning or the like. In a state in which the crucible 2 is attached to the crucible support device 18, the outer surface of one of the flanges 10a and 10b by the gripping tool, for example, two contact portions of the tweezers 59 shown in FIG. 6, for example, the tip portions 59a and 59b of the tweezers 59 One of the crucible forming members 2a and 2b is pulled up by pulling up along the inner peripheral surface 32 of the guide portion 28 with the inner surface and the inner surface sandwiched therebetween. Similarly, the other side is pulled up.

  In this case, since the outer peripheral surfaces of the flanges 10a and 10b and the inner peripheral surface 32 of the guide portion 28 are substantially in contact with each other, one of the two tip portions 59a and 59b of the tweezers 59 is connected to the outer peripheral surface of the flanges 10a and 10b. Hard to touch. Therefore, in this embodiment, as shown in FIG. 3, contact portion insertion portions, for example, tweezer tip portion insertion portions 60 and 60, which are open from the inner peripheral surface to the outer peripheral surface of the guide portion 28, are formed in the guide portion 28. Is formed.

  Although this denture casting apparatus is not shown in the figure, a lid for the crucible is attached above the crucible support apparatus 18, and the lid is located above the crucible 2 and on the lower side of FIG. 3. Slide between positions away from 18. Therefore, a user who attaches and removes the crucible 2 stands at a lower position (user side) in FIG. 3 and attaches and removes the crucible 2. The tweezer tip insertion portions 60 and 60 are provided in the vicinity of the protrusions 38a and 38b and at the back as viewed from the user side. In the vicinity of the protrusions 38a and 38b, the flanges 10a and 10b are lifted by the protrusions 38a and 38b, and the flanges 10a and 10b can be easily held by the tweezers 59.

  Further, the extension lines of the tweezer tip insertion portions 60 and 60 are formed in a substantially horizontal direction, not toward the central axis of the crucible 2. Of the two tip portions 59a and 59b of the tweezers 59, the one 59b that is brought into contact with the outer peripheral surface of the flange is positioned above the tweezer tip portion insertion portions 60 and 60. An object 59a to be brought into contact with the peripheral surface is positioned above the vicinity of the inner peripheral surface of the flange, both ends are lowered, and the outer peripheral surface and the inner peripheral surface of the flanges 10a and 10b as shown by arrows in FIG. The two tip portions 59a and 59b of the tweezers 59 are brought into contact with each other, hold the flanges 10a and 10b, and then lift upward to lift the crucible forming members 2a and 2b.

  Since the tweezer tip insertion portions 60, 60 are located behind the central axis of the crucible 2, the tip portion 59b of the tweezers 59 is inserted into the tweezer tip insertion holes 60, 60 to lift the crucible forming members 2a, 2b. As shown in FIG. 6, the crucible forming members 2a and 2b are lifted obliquely in the direction of the user's body, so that the crucible forming members 2a and 2b can be easily lifted.

  In addition, since the tweezer tip insertion portions 60, 60 are formed in the horizontal direction, a user standing on the user side does not need to unnaturally twist the tweezers 59 and easily grasps the crucible forming members 2a, 2b, The crucible forming members 2 a and 2 b do not slide from the tweezers 59.

  For example, as shown in FIG. 7B, when the tip insertion portion 600 of the tweezers is formed with the center of the crucible 2 facing, the tip portions 59a and 59b of the tweezers 59 are arranged side by side when the tweezers 59 are used normally. If the tip 59b of the tweezer 59 is inserted into the tweezer insertion portion 60 as it is, the tip 59a, 59b of the tweezer 59 and the flanges 10a, 10b will strike diagonally and become slippery. Therefore, it is required to unnaturally twist the tweezers 59. Otherwise, the inner surfaces of the tip portions 59a and 59b of the tweezers 59 and the flanges do not face each other, which makes it difficult to use.

  On the other hand, if the tweezer tip insertion portions 60 and 60 are formed in the horizontal direction, the user can see that the tip portions 59a and 59b of the tweezers 59 are arranged side by side as shown in FIG. The crucible forming members 2a and 2b can be grasped, the crucible forming members 2a and 2b can be easily grasped, and the crucible forming members 2a and 2b do not slip carelessly.

  Note that the tweezer tip insertion portions 60 and 60 are provided in the vicinity of the protrusions 38a and 38b located on both sides of the dividing surface of the crucible 2, because the operator who pulls up the crucible 2 This is because the work is performed directly facing the dividing plane, so that the worker can easily perform the lifting work regardless of whether the worker is right-handed or left-handed.

  In the above embodiment, the metal melting apparatus is used in a dental denture manufacturing apparatus. However, the apparatus is not limited to this, and any apparatus that uses a molten metal may be used. it can.

  In the above embodiment, the crucible 2 is divided and formed into two crucible forming members 2a and 2b. However, the crucible 2 can be divided into three or more, or an integral crucible that is not divided can be used. However, in this case, for example, the crucible is tilted and the molten metal is cast into a mold. When an integral crucible is used, only one tweezer tip insertion portion 60 can be provided. The tweezer insertion portions 60, 60 are formed from the inner peripheral surface to the outer peripheral surface of the guide portion 28, but need not be formed up to the outer peripheral surface as long as the tip portion of the tweezers can be inserted from above. In the above-described embodiment, the protrusions 36 are provided on the bottom surface 34 of the guide portion 28, but may not be necessary in some cases. Further, in the above embodiment, the tweezer tip insertion portion 60 is provided horizontally without passing through the center of the crucible 2. However, if the tweezers are allowed to be twisted, the tweezer tip insertion portion 60 is provided at the center. It is also possible to configure the extension line so as to pass through the center of the crucible 2.

2 Crucible 4 Body 10 Flange 18 Crucible support 28 Guide part 60 Tweezer tip insertion part (contact part passing part)
36 Crucible insertion hole (insertion hole)

Claims (7)

A flange formed in the periphery of the upper end of the crucible body on a support surface around the insertion hole, having a through hole through which the body of the crucible having a hollow body for containing metal is passed. A crucible support that comes in contact with,
A guide part formed on the upper surface of the crucible support part so as to surround the periphery of the flange and extend upward,
Passing through the contact portion provided in the guide portion with its upper portion opened along the thickness direction so that the contact portion to the outer surface of the gripping tool that contacts and grips the outer surface and the inner surface of the flange can be passed. Crucible support device provided with at least one section.   The crucible support device according to claim 1, wherein the crucible support part is disposed horizontally, and the contact part passage part is a center of the insertion hole as viewed from a position where a user who supports the crucible on the crucible support part stands. The crucible support device provided in the back side from the horizontal line which passes through.   The crucible support device according to claim 1, wherein the contact portion passage portion is formed in parallel to a horizontal line passing through the center of the insertion hole without passing through the center of the insertion hole. The crucible support device according to any one of claims 1 to 3, wherein the contact portion passage portions are respectively provided on both left and right sides in a plan view of the flange.   5. The crucible support device according to claim 4, wherein a protrusion projecting upward is provided on the support surface in the vicinity of each of the contact portion passage portions so as to contact the lower surface of the flange. 6. The crucible support device according to claim 5, wherein the crucible is divided and formed into two crucible forming members by a dividing surface passing through the center thereof, and the contact portion passing portion together with the protrusion corresponding to each of these crucible forming members. A crucible support device in which is formed .   The crucible support device according to claim 6, wherein a part of the flange of the crucible forming member is notched, and a protruding portion complementary to the notch corresponds to the notch, and A crucible support device provided on the inner surface.

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