Structure for preventing air leakage between stopper rod and core rod of tundish

Abstract

The utility model discloses a structure for preventing air leakage between a tundish stopper rod and a core rod, which comprises a hollow screw rod, two groups of external components and a lower gasket, the external components are arranged on the hollow screw rod, the lower gasket is slidably sleeved on the hollow screw rod, one end of the hollow screw rod adopts a spherical surface, and the other end of the hollow screw rod adopts a spherical surface. And the hollow screw rod is added with a high-temperature sealing material. The utility model relates to the field of stopper rod design and use, in particular to a structure for preventing air leakage between a tundish stopper rod and a core rod.

Description

Technical Field

[0001] The utility model relates to the field of stopper rod design and use, in particular to a structure for preventing air leakage between a tundish stopper rod and a core rod. Background Art

[0002] The stopper rod is mainly used for opening and closing the tundish. According to the different types of steel being cast, the stopper rod is made into various forms (porous or slit type) at the end to blow air (argon, etc.), which greatly reduces the total amount of inclusions in the ingot, improves the quality of the ingot, and reduces the accidents of the stopper rod itself, thereby increasing the continuous casting output. The stopper rod is mainly used for opening and closing the tundish. In addition to automatically controlling the molten steel flow from the tundish to the crystallizer, it can also blow inert gas into the tundish.

[0003] 1) Use alumina graphite plug or magnesium oxide at the end of the stopper rod to enhance the end strength to achieve the effect of extending the casting.

[0004] 2) Argon gas passes through the plug rod with directional air holes to the plug head, establishing "back pressure" to exclude atmospheric infiltration into the argon supply system.

[0005] The stopper rod design is of great significance for reducing production costs and improving the quality of the casting.

[0006] During the casting process, the phenomenon of "argon leakage" often occurs in the tundish stopper rod. It is necessary to prevent leakage at the connection between the core rod and the stopper rod and at the connection between the middle argon hose. At present, the conventional method is to reserve a 30° inclined cone in the refractory material, process the core rod to 60°, and add a high-temperature graphite pad in the middle for sealing. Due to leakage between the stopper rod core rod and the embedded bolt thread and the stopper rod connector, the argon blowing pressure of the stopper rod becomes low, the flow rate is unstable, and it becomes negative pressure, absorbing air. Oxidized molten steel causes nodules around the stopper rod, causing molten steel inclusions to be unable to float up, slowly accumulating inclusions at the upper water inlet and blocking the upper water inlet, causing the molten steel surface flow field to be unstable, and sometimes some inclusions are washed into the slab, seriously affecting the quality of the slab.

[0007] Some designs add extra-thick graphite pads to the overall refractory material of the stopper rod, and weld the stopper rod core rod pressure plate to the core rod to prevent air leakage. This method is costly and cannot solve the problem of thermal expansion and contraction. The cost of each stopper rod increases by about 60 yuan. Foreign VSV uses high-priced quick connectors with short service life and a connector cost of 2,500 yuan per piece. The cost is very high because the continuous casting stopper rod is in the high-temperature area and the material is deformed and damaged at high temperatures. Utility Model Content

[0008] The technical problem to be solved by the utility model is that the existing method for preventing air leakage is high in cost and easy to deform and damage.

[0009] In order to solve the above problems, the technical solution adopted by the utility model is as follows: the utility model is a structure for preventing air leakage between the middle package plug rod and the core rod, including a hollow screw, an external component and a lower gasket, the external component is arranged on the hollow screw, and the external component is symmetrically arranged in two groups, the lower gasket is slidably sleeved on the hollow screw, one end of the hollow screw adopts a spherical surface, and the hollow screw adds high-temperature sealing material.

[0010] Furthermore, the external component includes a nut, an upper gasket, a spherical gasket and a concave gasket, the nut is threadedly connected to the hollow screw, the upper gasket is slidably sleeved on the hollow screw, the spherical gasket is slidably sleeved on the hollow screw, the concave gasket is slidably sleeved on the hollow screw, and the nut, upper gasket, spherical gasket and concave gasket are arranged in sequence.

[0011] Preferably, the nut specification is M39.

[0012] Preferably, the hole of the lower gasket is 10 mm larger than the diameter of the hollow screw.

[0013] Preferably, the upper gasket hole is 10 mm larger than the diameter of the hollow screw.

[0014] Preferably, the spherical gasket hole is 10 mm larger than the diameter of the hollow screw.

[0015] Preferably, the concave spacer hole is 10 mm larger than the hollow screw diameter.

[0016] The beneficial effects achieved by the utility model using the above structure are as follows:

[0017] 1. The plug rod clamping device is equipped with a gas test stand to facilitate tightening the plug rod and the core rod and solve the problem of core rod slipping.

[0018] 2. There is leakage at the connection point of the middle argon hose, and it is sealed using a spherical surface.

[0019] 3. In order to prevent air leakage at various positions, a layer of glue is applied on the hollow screw of the stopper rod, and a layer of cloth is added to fill the gap between the screw rods and the air leakage between the joints of the parts; simplify the operation, reduce production costs and improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a structure for preventing air leakage between a tundish plug rod and a core rod proposed by the utility model;

[0021] Figure 2 The utility model discloses a structural schematic diagram of a hollow screw for preventing air leakage between a tundish plug rod and a core rod.

[0022] Among them, 1. hollow screw, 2. external component, 3. lower gasket, 4. nut, 5. upper gasket, 6. spherical gasket, 7. concave gasket, 8. spherical surface. DETAILED DESCRIPTION

[0023] like Figure 1~Figure 2 As shown, the utility model is a structure for preventing air leakage between a middle package plug rod and a core rod, comprising a hollow screw 1, an external component 2 and a lower gasket 3, wherein the external component 2 is arranged on the hollow screw 1, and two groups of the external component 2 are symmetrically arranged, and the lower gasket 3 is slidably sleeved on the hollow screw 1, and one end of the hollow screw 1 adopts a spherical surface 8, and the hollow screw 1 is increased with a high-temperature sealing material.

[0024] The external component 2 includes a nut 4, an upper gasket 5, a spherical gasket 6 and a concave gasket 7. The nut 4 is threadedly connected to the hollow screw 1, the upper gasket 5 is slidably sleeved on the hollow screw 1, the spherical gasket 6 is slidably sleeved on the hollow screw 1, and the concave gasket 7 is slidably sleeved on the hollow screw 1. The nut 4, the upper gasket 5, the spherical gasket 6 and the concave gasket 7 are arranged in sequence.

[0025] When used specifically: install the nut 4, upper gasket 5, spherical gasket 6 and concave gasket 7 and other components onto the hollow screw 1, install the device to the designated position, block the argon hole of the plug rod head, use high-temperature glue and high-temperature sealing tape to fill the gap of the thread of the hollow screw 1, tighten it with a pipe clamp to ensure that there is no air leakage, and use the spherical surface 8 for sealing to ensure that it does not loosen under high temperature conditions and achieve no air leakage.

[0026] It should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A structure for preventing air leakage between a tundish plug rod and a core rod, characterized in that: It includes a hollow screw, an external component and a lower gasket. The external component is arranged on the hollow screw. The external component is symmetrically provided with two groups. The lower gasket is slidably sleeved on the hollow screw. One end of the hollow screw adopts a spherical surface. The hollow screw is added with high-temperature sealing material.

2. A structure for preventing air leakage between a tundish plug rod and a core rod according to claim 1, characterized in that: The external component includes a nut, an upper gasket, a spherical gasket and a concave gasket. The nut is threadedly connected to the hollow screw, the upper gasket is slidably sleeved on the hollow screw, the spherical gasket is slidably sleeved on the hollow screw, and the concave gasket is slidably sleeved on the hollow screw. The nut, upper gasket, spherical gasket and concave gasket are arranged in sequence.

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