JPH0630130U - Platinum well attachment structure to spout bottom - Google Patents

Abstract

(57) [Summary] [Purpose] Attaching the platinum well to the spout bottom so that it can be used for a long period of time without deteriorating the cover of the platinum well by the molten glass that permeates through the gap between the spout bottom and the platinum well. Provide structure. [Configuration] Spout bottom 13 and the spout bottom 13
Platinum well 1 fixed with an attachment member in the opening 12 of the
A heat-resistant member for blocking the molten glass G is provided so that the molten glass G entering from the gap a with respect to 4 does not come into contact with the mounting member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for mounting a platinum well on a spout bottom.

[0002]

[Prior art]

 As shown in FIG. 2, a spout 11 that is a pool of the molten glass G is provided at the tip of the feeder 10 that serves as the supply portion of the molten glass G. In this spout 11, the opening 12 through which the molten glass G flows out. An orifice ring 15 is attached to a spout bottom 13 provided with a platinum well 14, and a molten glass G is extruded from the orifice ring 15 by a needle 16. The platinum well 14 corresponds to a connecting member between the spout bottom 13 and the orifice ring 15. A cylindrical refractory material 17 is covered with a cover 18 made of a platinum-rhodium alloy. A supporting stainless steel support plate 19 is fixed from below the spout casing 20 with bolts 21, one end of the cover 18 is fixed to the support plate 19 with a pressing bolt 22, and the upper end of the platinum well 14 is opened. It is attached in a state of being inserted in 12.

[0003]

[Problems to be solved by the device]

In the above-described mounting structure, since perfect contact cannot be maintained on the contact surface between the spout bottom 13 and the platinum well 14, a slight gap a is formed between the spout bottom 13 and the platinum well 14, and the feeder 10 passes through this gap a. The molten glass G in the inside penetrates, but since the amount of the molten glass G that penetrates is very small, glass products are usually manufactured as it is. However, for example, the molten glass G used when manufacturing glass products for cathode ray tubes contains lead oxide, and the molten glass G containing lead oxide penetrates through the gap a and the platinum well 14 When the molten glass G comes into contact with the support plate 19 or the holding bolt 22 which is a mounting member, the molten glass G is a metallic lead produced by a reaction between lead oxide in the molten glass G in a high temperature state and a metallic substance of stainless steel. It becomes a strongly reducing contaminated glass containing Pb and unsaturated oxides FeO, CrO and oxides Fe ₂ O ₃ , Cr ₂ O ₃ , NiO and the like. Since the metallic substance in the contaminated glass has a property of easily binding to white gold, platinum and the metallic substance which are extremely brittle and have a small strength are formed in the crystal grain boundaries of the platinum-rhodium alloy forming the cover 18 of the platinum well 14. As a result, there is a problem that the strength of the alloy cover 18 of the platinum well 14 is significantly deteriorated and the service life thereof is shortened.

Therefore, an object of the present invention is to maintain the strength of the platinum rhodium alloy cover or platinum cover constituting the platinum well for a long period of time without being deteriorated by the molten glass that permeates through the gap between the spout bottom and the platinum well. The purpose is to provide a structure for attaching a platinum well to a spout bottom that can be used.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above problems and objects, and a molten glass that penetrates through a gap between a spout bottom and a platinum well fixed to the opening of the spout bottom by a mounting member is attached to the mounting member. The platinum well is attached to the spout bottom by providing a heat resistant member for blocking the molten glass so as not to come into contact with the spout bottom.

[0006]

[Action]

 In the structure for mounting the platinum well on the spout bottom of the present invention, a heat resistant member for blocking the molten glass is provided so that the molten glass that enters from the gap between the two does not come into contact with the mounting member for the platinum well. As a result, the molten glass penetrating through the gap does not come into contact with the platinum well mounting member, and there is no risk of producing contaminated glass.

[0007]

【Example】

 Hereinafter, a structure for mounting a platinum well on a spout bottom according to the present invention will be described based on embodiments.

FIG. 1 is a sectional view showing a mounting structure of the present invention. The same components as those in FIG. 2 are designated by the same reference numerals.

In the opening 12 of the spout bottom 13, a platinum well 14 in which a refractory material 17 is covered with a platinum / rhodium alloy cover 18 is fixed with a bolt 21 via a support plate 19 and a spout casing 20. . The surface of the support plate 19 is coated with alumina, and the alloy cover 18 is extended so as to cover the entire surface of the support plate 19, and the end portions of the support plates 23, 23 made of a heat-resistant material. It is sandwiched by 23 and is fixed to the support plate 19 by pressing bolts 22. Reference numeral 24 denotes a damming member made of a refractory material provided on the alloy cover 18 extending downward from the gap a between the spout bottom 13 and the platinum well 14 and in front of the holding bolt 22. The space between the dam member 24 and the alloy cover 18 and the upper part of the pressing plate 23 are filled with refractory alumina cement 25.

In such a mounting structure of the platinum well 14 to the spout bottom 13, the molten glass G permeating through the gap a between the spout bottom 13 and the platinum well 14 is a weir provided in front of the holding bolt 22. It is blocked by an alumina cement 25 filled on the member 24 and the alloy cover 18.

[0011]

[Effect of device]

 As described above, according to the platinum well mounting structure to the spout bottom of the present invention, the strength of the platinum rhodium alloy cover or platinum cover that composes the platinum well is deteriorated by the molten glass that permeates through the gap between the two. Without doing so, the platinum well can be used for a long period of time, which is a significant effect in practical use.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure for attaching a platinum well to a spout bottom according to the present invention.

FIG. 2 is a cross-sectional view showing a structure for attaching a platinum well to a conventional spout bottom.

[Explanation of symbols]

 10 Feeder 11 Spout 12 Opening 13 Spout Bottom 14 Platinum Well 15 Orifice Ring 16 Needle 17 Refractory 18 Alloy Cover 19 Support Plate 20 Spout Casing 21 Bolt 22 Holding Bolt 23 Holding Plate 24 Weiring Member 25 Alumina Cement

Claims (1)

[Scope of utility model registration request] 1. A heat-resistant member for blocking molten glass so that molten glass entering through a gap between a spout bottom and a platinum well fixed to the opening of the spout bottom by a mounting member does not come into contact with the mounting member. A structure for attaching a platinum well to a spout bottom, characterized by being provided with.