JPS5967327A - Holding furnace and its production - Google Patents

Abstract

PURPOSE:To prevent the failure of seals by thermal expansion at a low cost with ease by forming heater protective through-holes having tapered screw parts on both side walls of a holding furnace of an underheater type for melting Al, penetrating heater protective pipes in the through-holes and sealing the same with sealants. CONSTITUTION:A pair of tapered screw parts 2, 3 are formed oppositely on both side walls 1 made of refractories on the innermost layer of a holding furnace, and are opened toward the furnace inside. The screw parts 2, 3 are tapered to about 1-30 deg. and are formed reverse from each other. A heater protective pipe 4 is passed and held through the screw parts 2, 3 and through-holes 9, 10 for heater protective pipes. A heat generating means for melting or insulating Al is inserted into the pipe 4. Sealants 6, 7 are packed in the spacings between the parts 2, 3 and the pipe 4. Ceramic fibers, etc. through which molten Al is hardly leakable are used as the sealants 6, 7. The failure of the sealants 6, 7 is obviated even if the pipe 4 or the furnace expands thermally.

Description

[Detailed description of the invention]

The present invention relates to a holding furnace used for melting or heat-insulating aluminum, and a method for manufacturing the same. The heater of an underheater type holding furnace usually has three pieces of wood immersed in the molten metal. This immersion heater tJ is composed of a light heating element such as a heater protection tube and a vibrator that protects the heating element. Both ends of immersion heater

[J Heater protection tube passes through the through hole and exits to the outside of the furnace. In the conventional under-heater type holding furnace, the heater protection tube through-hole was 1-1. For this reason, the conventional method of sealing the through hole of the heater protection tube has been to simply insert a filler such as Leramiku fiber or graphite fill lX into the gap between the holes. However, in the conventional method, the heater protection tube and the furnace are covered with thermal expansion, so the seal is easily damaged. 1 Present invention [31. In view of the above-mentioned circumstances, a holding furnace and its manufacturing method that can be easily sealed at low cost without damaging the seal even if the heater protection tube and furnace undergo thermal expansion. In the present invention, a through hole for the heater protection tube 11 is formed in the side wall of the holding furnace to accommodate the tapered threaded portion, and the heater protection tube is passed through the heater protection tube through hole. 1) Fill the space between the heater protection tube and the tapered threaded part with a sealing material, and screw the sealing material into the threaded part of the heater protection tube. ] - Seals the gap between the bar threads. In particular, if oppositely oriented bar threads are formed on both sides of the holding furnace, when the heater protection tube is rotated in a predetermined direction, both walls are sealed at the same time. The seal of the present invention Since the method has the above configuration, the sealing area becomes very large due to the tapered thread part and multiple steps.
Seal pox increases by 4 o if seals are made reliably.
Furthermore, due to thermal expansion of the heater protection tube, the sealing material is embedded in the tapered threaded portion, so that it is possible to completely seal from J to Y, and furthermore, the sealing material is completely prevented from coming out. In addition, the sealing method of the present invention has the following advantages:
Since no special parts are required, it is inexpensive and easy to install. The jet protection tube can also be easily replaced. Hereinafter, 38 preferred embodiments of the present invention will be explained with reference to the drawings.
(Explanation) A pair of tapered threaded portions 2.3 are formed facing each other on the innermost refractory side walls 1 of the holding furnace (see Fig. 1). - Threaded parts 2 and 3 are directed toward the inside of the furnace. Heater protection tube 4 @ j - Pass through the par threaded parts 2 and 3 and heater protection tube through holes 9 and 10 to maintain the temperature at °C. Inside heater protection tube 4 1; A primary heating element is inserted and heats the molten metal 5. Both ends of the heating element are located outside the holding furnace and are connected to a power source. Location map 'CA'
sell. Thread pitch P Ll: Desirably (20±5) mm. The depth D of the thread trough is preferably about half the thread pitch P. This is to provide strength to the -1-par threaded portion. In the embodiment shown in Fig. 2, the thread pitch P is 20 m.
m, and the depth D of the valley was 1Qmmr. Moreover, the taper angle is preferably 1 to 30 degrees. Deeper
The angle varies depending on the ease of filling the seal +) J6.7 (see Figure 1), the performance of the sealing materials 6 and 7, etc. In the example shown in FIG. 2, the Dever angle was 9.5°. Further, in the examples, the angle X of the peak was 30°, and the radius of the arc of the peak was 1 or 10 mm. The tapered thread 2.3 is formed in the opposite direction 1'. That is, once the tapered threaded portion 2 is formed into a left-handed thread, the tapered threaded portion 33 is formed into a right-handed thread. Now, pass the heater protection tube 4 through the -7-par threaded part 2.3! Then, sealing materials 6, 7 are filled into the gaps between the wired wire portions 2, 3 and the heater protection tube 1. 3. Molten Ml + Aluminum 5 easily cracks even if there is a small gap. Therefore, the sealing material is 6.7 and C is molten 11g! aluminum 5
-1 () must be made of a material that does not easily leak. For example, what about sealing materials 6 and 7?' GJ 1? Ramitsuku 7? Ibaya) Bulk made of graphite film, fer l~, gasket 1~ or (J, paste type is preferable. Taper threaded portions 2.3 are formed in opposite directions on both side walls, so Turn the protection tube 4 in one direction and seal the opening 6,
7 is inserted into the tapered threaded portion 2.3, and the gap between the Bouber threaded portion 2.3 and the heater protection tube 4 is filled with the sealing material 6°7. In addition, Fig. 1 shows the sealing materials 6 and 7.
This shows the stage before it is embedded. Therefore, at this stage (
, 1 Actually, no molten metal 5 is added. At this point, heater ff1Hff/I etc. sealing material 6゜7
To ensure that both parts rotate together, seal 4. J
11 against 6? It is preferable to configure the heater protection tube 4 in a shape that reduces friction resistance. Alternatively, it is also desirable to apply adhesive or other adhesive to the surface of the heater protection tube 4. If it is turned in the opposite direction, the sealing material 6°7 can be taken out. Figs. An example is shown in a rai plane view. Fig. 4Δ is a 8-△ sectional view of the covered embodiment shown in Fig. 4C; -B r! 7′i figure, 1st side Ic
The figure is a C-CRFi plane view of the embodiment shown in Figure 4Δ. In this example, three heaters are used. FIG. 5 is a sectional view showing an example in which a plurality of steps are used instead of a tapered threaded portion. In the example shown in FIG. 5, a step-shaped v1 through hole 8 is formed instead of the Dever screw portion. This J: Unana floor r! 9. The contact surface frk of the sealing material 0 widens 4 in the n-shaped through hole.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an example of the innermost layer refractory of a holding furnace according to the present invention, and FIG.
Figure 3 is a sectional view showing an example of a par threaded part;
Figure 40 shows the innermost layer 4i4 that forms the 'j-bar screw part.
Can you give me an example of a big name? J' 1fli side view, Fig. 5 shows another example of the par threaded part of the holding furnace in the Kizawa light.
It is a lfJi plane view. . 1... Innermost layer refractory side wall 2.3... Tapered screw portion 4... Heater protection tube 5... Molten metal 6.7... Sealing material 8. ...Through hole procedure supplement p4 (self-defense) 11r1Japanese 1958 11 rJ ++ [1 Patented Patent Office Commissioner Aio Wakasugi Indication of l crotch 1, small i'1 Patent Application No. 161022 1987 2, Invention Name Holding Furnace Q11 Button Press 3. Person making the amendment 1'1 Which Seki 1 Series Patent Applicant 2] Address 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name 2nd Year Lamix Stock Benrei (!'jZ/Gen 4, Agent Address: Toranomon Electric Building, 2-8-1 Toranomon, Minato-ku, Tokyo Name: Ben]! I! Ten (74,53) [1-1 side
Revocation 1,'-5, day of amendment order
"Full text of the specification 7. Contents of the amendment (1. The name of the invention has been amended to "holding furnace." (2) The full text of the specification has been revised to "holding furnace."). 1. Name of the invention Holding furnace 2. Claims (1) In an under-heater type holding furnace for melting or keeping aluminum heated, heater protection is provided by providing a Dever threaded portion or a stepped portion on the side wall of the holding furnace. Form a tube through hole 1, and attach the end of the heater protection tube to the heater protection tube I.
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a holding furnace 1゜3, characterized in that aluminum is held in a J+ manner through a through hole, and a sealing material is filled between a heater protection tube and a Dever threaded portion or a stepped portion. This relates to a holding furnace used for melting or keeping warm. In the conventional ashter heater type holding furnace, the heater protection @ rock through hole was slate 3, therefore, the conventional cage 9
The method of sealing the through hole of the protection tube was to simply fill the gap between the sheets with a filler such as relamic fiber or graphite film. However, method A had the disadvantage that the seal was easily damaged due to thermal expansion of the heater protection tube and the furnace. It is an object of the present invention to provide a holding furnace in which the seal does not break even when the protective tube and the furnace expand thermally, and can be sealed at low cost during bending. A heater protection tube through hole is formed in the side wall with the tapered threaded portion or stepped portion to the right, and the protective tube is held in the heater protection tube through hole. Fill the gap between the heater protection tube and the tapered threaded part with a sealing material, and insert the sealing material into the Dever threaded part or the stepped part to seal the gap between the heater protection tube and the tapered threaded part. It becomes very wide due to the stepped part.The increased seal contact area IJ11 allows for a reliable seal and increases the seal strength.Furthermore, even if the heater protection tube thermally expands, the sealing material will not close to the tapered threaded part or the stepped part. As a result, a perfect seal can be achieved, and the sealing material is completely prevented from being pulled out.Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. Explaining the example of FIG. 1, a pair of tapered screws 6 (S2.3) are formed facing each other on both side walls 1 made of refractory material in the innermost layer of a holding furnace.A pair of Dever screw portions 2 .3 points toward the inside of the furnace.Of course, /υ, open the tapered threaded portion 2.3 toward the outside of the furnace, and "C" is also acceptable. It is held through the protective tube through hole 9.10. A valve heating means is inserted into the heater protective tube 4 to heat the molten metal 5. Electricity, gas, etc. are used as the heating means. Fig. 2 shows a taper. Cross-sectional thread pitch showing an example of threaded part [
] is preferably (20±5) mm. The depth D of the thread trough is desirably about half the thread pitch 1], and this is to provide strength to the tapered threaded portion. In the embodiment shown in FIG. 2, -C has a screw pitch [] of 2Q+nn+ and a valley depth [) of 10 ml IC. In addition, the taper angle is preferably 1 to 30°C, 5--
The bar angle is the filled layer of sealing materials 6 and 7 (see Figure 1).
It varies depending on the ease of doing the second thing, the performance of the sealing materials 6 and 7, etc. In the embodiment shown in FIG.
The Deber angle was 9.5°C'. Further, in the example, the angle II J in the example of Fig. 1: Sea urchin, through holes 9 in opposite side walls 1,
10, it is desirable to form the Dever threads 2.3 in the opposite direction, that is, if the tapered threaded part 2 is formed to have a left-hand thread, then the tapered threaded part 3 is formed to be a right-hand thread. If the heater protection tube 1 is to be supported in a J'1-supported manner, a through hole 9 or 10 may be formed in one side wall 1. Now, in the example shown in FIG. 1, the heater protection tube 4 is passed through the tapered threaded portion 2.3, and the gap between the tapered threaded portions 2, 3 and the heater protection tube 4 is filled with a sealing material 6.7. . The molten aluminum 5 easily leaks from even the slightest gap. For this reason, the old seals 6 and 7 are molten aluminum 5
Materials that do not easily leak must be used. For example, the sealing materials 6 and 7 are preferably bulk materials made of ceramic fibers or graphite films, felts, gaskets, or paste materials. In the example shown in FIG.
The sealing materials 6 and 7 are inserted into the tapered threaded portions 2.3, and the gaps between the 7-bar threaded portions 2 and 3 and the heater protection tube 4 are filled with the sealing materials 6 and 7. Incidentally, FIG. 1 shows a stage before the sealing materials 6 and 7 are inserted. Therefore, at this stage, molten metal 5 is not actually added. At this time, in order to ensure that the heater protection tube 4 and the sealing material 6°7 rotate together, it is preferable to structure and cover the heater protection tube 4 in a manner that increases the friction resistance against the sealing material 6. . Alternatively, it is desirable to coat the surface of the heater protection tube 4 with a adhesive or other coating agent. Furthermore, when removing the heater protection tube 4, the sealing material 6.7 can be taken out by rotating the heater protection tube 4 in the opposite direction. Fig. 4Δ, Fig. 4B, and Fig. 40 show the tapered threaded portion 2,
An example of the innermost refractory side wall 1 formed with the innermost layer 3 is shown.
This is a diagram of 1l17i. Fig. 4Δ is a △-△ sectional view of an embodiment shown in Fig. 4C, Fig. 413 is a sectional view taken along F3-B of the embodiment shown in Fig. 4Δ, and Fig. 4C is a sectional view of the embodiment shown in Fig. 4A. FIG. In this example, three heaters are used. ] - The direction of the bar screw part can be either - C, and as shown in FIG. In the example C shown in FIG. 5, a stepped through hole ε3 is formed instead of the tapered threaded portion. Even with this step-like through hole, the contact area of the sealing material 6 is increased. 4. Brief description of the drawings FIG. 1 shows an example of the innermost layer refractory of the holding furnace according to the present invention in a state before sealing. 1 Partial sectional view FIG. A sectional view is shown, FIG. 3 is a partial view showing an example of a heater protection tube used in the present invention, and FIGS. 1 is a sectional view, and FIG. 5 is a sectional view showing an example of a stepped portion of a holding furnace according to the present invention. 1 ...... Innermost layer refractory side wall 2.3
...Tapered thread part 4 ...... Heater protection tube 6.7 ... Sealing material 8 ...... Through hole special W1 applicant Toshiba Shiramix Co., Ltd. Il! ! 1
Name −.

Claims (2)

[Claims] (1) Place the aluminum in an underheater-type holding furnace for melting or keeping it warm, and form a through-hole for the overnight protection tube with a 7-par thread or a plurality of steps on the side wall of the holding furnace. A holding furnace characterized in that an end of a heater protection tube is held by passing the end of the heater protection tube through a through hole of the heater protection tube. (2) In a method for preparing an underheater-type holding furnace for melting or keeping aluminum heated, a heater protection tube is installed on opposite side walls of the holding furnace with Dauber threads in opposite directions. (Member) By forming an ITI hole, applying a sealing material between both ends of the heater protection tube and the tapered threaded part, and rotating the heater protection tube in a predetermined direction (both ends of the heater protection tube 1. A method for manufacturing a holding furnace, characterized in that the sealing material is simultaneously inserted into the tapered threaded part at the step -C1 to seal and cover the gap between the heater protection tube and the tapered threaded part.