JPH0527488U - Joint structure of molten metal transport pipe - Google Patents

Abstract

(57) [Summary] [Purpose] The joint structure of the molten metal transport pipes that directly connect the ends of the molten metal transport pipes that are adjacent to each other is Even if it is present, the ends of both molten metal transport pipes can be reliably maintained in a state of being connected and connected. [Structure] A flange portion 2 is formed at each end of the molten metal transport pipe 7, and a connecting metal fitting 3 for sandwiching both flange portions 2 around the entire circumference thereof is provided in a state in which both flange portions abut each other. A ceramic cover 4 is provided to cover the entire coupling fitting 3 in a state where both flange portions 3 are sandwiched and coupled at 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint structure for molten metal transport pipes that connect the ends of adjacent molten metal transport pipes to each other.

[0002]

[Prior Art]

 The joint structure of the molten metal transport pipe described in the above is a conventional structure in which a flange portion is formed at each end of the molten metal transport pipes adjacent to each other, and both flange portions are abutted against each other. A plurality of gold attribute fasteners (for example, bolts) were inserted through the entire circumference at an equal pitch and tightened and fixed, and the ends of the two molten metal transport pipes were connected and connected.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional one in the joint structure of such a molten metal transport pipe, when the joint portions of both flange portions of the molten metal transport pipes adjacent to each other are immersed in the molten metal, the metallic fasteners exposed to the outside are It may be exposed to the high temperature of the molten metal and may be melted or deformed.In addition, when connecting both flange parts of both pipes, stress concentration occurs in ceramics around the metal fastener of the flange part, and the flange part is There was a risk that the pipes would be easily broken and the ends of both pipes could not be connected and connected. The present invention has been made in view of the above circumstances, and even if the joints of both flanges of the molten metal transport pipes adjacent to each other are immersed in the molten metal, the molten metal transport pipes can be connected and connected at their ends. An object is to provide a joint structure for a transportation pipe.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the features of the present invention in the joint structure of the molten metal transport pipe described above are such that a flange portion is formed at each end of the molten metal transport pipes adjacent to each other, and those flange portions are butted to each other. In this state, a connecting metal fitting for sandwiching the both flange portions around the entire circumference thereof is provided, and a ceramic cover for covering the entire connecting metal fitting in a state of sandwiching and connecting both flange portions with the connecting metal fitting is provided.

[0005]

[Action]

 That is, a flange is formed at each end of the molten metal transport pipes that are adjacent to each other, and a connecting metal fitting is provided to hold the two flanges in abutment with each other. At the same time, since the holding force by the connecting metal fittings extends over the entire circumference of both flange portions of the adjacent pipes, it is possible to prevent the holding force from being dispersed over the entire circumference and concentrating the reaction force locally. The part can be made less likely to be damaged. Further, by providing a ceramic cover that covers the entire connecting metal fitting while sandwiching and connecting both flange parts with the connecting metal fitting, it is possible to protect all the outsides of the joint parts of both pipes from high temperature materials such as molten metal. Therefore, even when the joint portion is immersed in the molten metal, the joint portion can be prevented from being violated by the molten metal.

[0006]

[Effect of the device]

 Therefore, it is possible to provide a joint structure for a molten metal transport pipe, which is capable of more reliably communicating and connecting the ends of the molten metal transport pipes adjacent to each other and improving the durability thereof.

[0007]

【Example】

 Hereinafter, an example of the joint structure of the molten metal transport pipe of the present invention will be described with reference to the drawings.

A molten metal transport pipe 1 for transporting a molten metal of a non-ferrous metal such as aluminum or zinc from a molten metal holding furnace to a die casting machine, and at a position immersed in the molten metal in the molten metal holding furnace. It has a joint structure.

As shown in FIG. 1, a joint structure I of the molten metal transport pipe has flange portions 2 formed at respective ends of the molten metal transport pipes 1 adjacent to each other, and a connecting fitting for sandwiching both flange portions 2 therebetween. 3 and a cover 4 for covering the connecting fitting 3 is provided.

The connecting fitting 3 is composed of a pair of ring bodies 5 and a plurality of bolts 6 for fastening and connecting the ring bodies 5. Each of the pair of ring bodies 5 is formed with a recessed portion 7 over the entire circumference on a part of the inner peripheral surface thereof. The ring body 5 has the flange portion 2 at the end portion of the molten metal transport pipe 1 in the recessed portion. It is designed such that it can be fitted outside in a state of being locked inside 7, and can be locked over the entire circumference of both flange portions 2 in a state where both flange portions 2 of adjacent molten metal transport pipes 1 are butted against each other.

Then, the bolt mounting through holes 8 are provided at equal pitches over the entire side surface of the one side of the pair of ring bodies 5, and correspond to the through holes 9 over the entire side surface of the other side. Bolt mounting female screw holes 9 are provided, and by fixing bolts 6 to the pair of ring bodies 5 through the through holes 8 and the female screw holes 9, both flange portions of the adjacent molten metal transport pipes 1 are secured. The two can be pinched and connected in a state of abutting each other.

The cover 4 is a cylindrical body made of ceramics and is notched along the entire circumference of the inner peripheral surface thereof, and both flange portions 2 of the molten metal transport pipe 1 adjacent to the notched portion are sandwiched and connected. The entire connecting fitting 3 is covered.

The entire cover 4 is made of ceramics, and an Al ₂ O ₃ -based refractory mortar is interposed between the cover 4 and the connecting fitting 3 and the outer peripheral surface of the molten metal transport pipe 1 to seal the space between them. Therefore, all the surfaces that come into contact with the molten metal have high fire resistance.

The cover 4 can be divided into two parts in the radial direction so as to be easily attached to the ring body 5 as shown in FIG. 2, and between the cover 4 and the ring body 5. There is provided a mechanism for connecting the. This mechanism is composed of a mounting bolt 10 formed on both side surfaces of the cover 4 and a ceramic bolt 12 for penetrating and fixing a mounting hole 11 formed on a side surface of the ring body 5. Further, as the constituent material of the cover 4, a Si ₃ N ₄ -based composite refractory material is used, but the material is not limited to this and may be, for example, a SiC 3 -based composite refractory material.

[Other Embodiments] As the connecting fittings, as shown in FIGS. 3 and 4, other than the above embodiment in which a pair of ring bodies 5 are divided in the axial direction of the molten metal transport pipe in the mounted state, The molten metal transport pipe 1 may have a ring body 5 that can be divided in the radial direction and a bolt 6 for tightening and connecting the ring body 5. By doing so, the number of bolts 6 for tightening and connecting can be reduced to facilitate the attachment / detachment. it can.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a main part.

FIG. 2 is an exploded perspective view of a main part

FIG. 3 is a vertical sectional front view of a main part of another embodiment.

FIG. 4 is a vertical sectional side view of a main part of another embodiment.

[Explanation of symbols]

 1 Molten metal transport pipe 2 Flange part 3 Connecting metal fitting 4 Cover

Claims (1)

[Scope of utility model registration request] 1. A joint structure of molten metal transport pipes for connecting the ends of the molten metal transport pipes (1) adjacent to each other, wherein a flange portion (2) is provided at each end of the molten metal transport pipe (1). A connecting metal fitting (3) is formed which holds both flange portions (2) over their entire circumference in a state in which the two flange portions (2) are butted against each other, and the connecting metal fitting (3) is used to connect both flange portions (2) to each other. A joint structure for a molten metal transport pipe, comprising a ceramic cover (4) covering the entire connecting fitting (3) in a state where the flange portion (3) is held and connected.