Submerged blocking flag device for tin bath and float glass tin bath

Abstract

The utility model belongs to the technical field of float glass production equipment, and particularly discloses a submerged blocking flag device for a tin bath and the float glass tin bath. The tin bath is used for solving the problem that a blocking flag of a wide section of an existing tin bath is poor in tin liquid backflow control effect. The submerged blocking flag device comprises a graphite plate, a water-cooling supporting pipe and a fixing support, the graphite plate is composed of a blocking part and a connecting part, the longitudinal section of the graphite plate is in an L shape, the top end of the connecting part of the graphite plate is fixedly connected with the front end of the water-cooling supporting pipe, and the rear end of the water-cooling supporting pipe is connected with the fixing support. When the submerged blocking flag device is arranged in a tin bath, the tail end of the blocking part abuts against the side wall of the tin bath, the bottom end of the blocking part is in close contact with the bath bottom of the tin bath, the front end of the blocking part is located under glass floating on tin liquid, and the height of the blocking part is 15 mm lower than the depth of the tin liquid. According to the tin bath, the flowing stability of tin liquid in the tin bath is guaranteed, and cold tin liquid is prevented from flowing back to the upstream.

Description

Technical Field

[0001] The utility model belongs to the technical field of float glass production equipment, in particular to a submersible flag blocking device for a tin bath and a float glass tin bath. Background Art

[0002] In float glass production, there's a significant temperature difference between the upstream and downstream tin baths. The hot tin upstream flows downstream, following the direction of glass movement, while the cold tin downstream flows back upstream from the sides of the bath. This flow of hot and cold tin affects glass in many ways, including ribbon stability, glass quality defects, and production efficiency.

[0003] To avoid these adverse effects, flags are an effective control measure. By adding flags to the tin reflux path, they can effectively control the majority of the tin reflux upstream. However, the flags currently used in the wide section of the tin bath are higher than the tin level, and the length of the flags decreases as they move upstream, resulting in poor control of the tin reflux. Utility Model Content

[0004] One purpose of the utility model is to provide a submersible flag device for a tin bath, which effectively solves the problem that the wide section of the current tin bath has a poor effect in controlling the reflux of tin liquid.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A submersible flag-blocking device for a tin bath comprises a graphite plate for blocking the backflow of tin liquid, a water-cooling support tube and a fixed bracket. The graphite plate consists of a blocking portion and a connecting portion. The longitudinal section of the graphite plate is L-shaped. The top end of the connecting portion of the graphite plate is fixedly connected to the front end of the water-cooling support tube, and the rear end of the water-cooling support tube is connected to the fixed bracket.

[0007] When the submersible flag barrier device is placed in the tin bath, the tail end of the barrier is close to the side wall of the tin bath, the bottom end of the barrier is in close contact with the bottom of the tin bath, the front end of the barrier is located directly below the glass floating on the tin liquid, and the height of the barrier is 15 mm lower than the depth of the tin liquid.

[0008] Furthermore, the front end surface of the blocking portion is an inclined surface inclined obliquely downward.

[0009] Furthermore, the length of the blocking portion is 1000 mm.

[0010] Furthermore, the blocking portion and the connecting portion are of integrated design.

[0011] Furthermore, the water-cooling support tube includes a hollow inner tube and an outer tube, the outer tube is sleeved on the outside of the inner tube, a water inlet channel is provided between the inner wall of the outer tube and the outer wall of the inner tube, a return water channel is provided on the inner side of the inner tube, a water inlet is provided at the rear end of the outer tube, and a return water port is provided at the rear end of the inner tube.

[0012] Another object of the present utility model is to provide a float glass tin bath, comprising a tin bath body and a plurality of pairs of submersible flag-blocking devices for the tin bath as described in the above embodiments, wherein each pair of the submersible flag-blocking devices is arranged on opposite sides of the tin bath body, and the plurality of pairs of the submersible flag-blocking devices are arranged at intervals in the wide section of the tin bath body along the length direction of the tin bath body.

[0013] Furthermore, 4-5 pairs of submersible flag blocking devices are arranged at intervals along the length direction of the tin bath body in the wide section of the tin bath body.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are:

[0015] The utility model is configured to submerge the front end of the blocking portion of the graphite plate just below the glass floating on the tin liquid, with the height of the blocking portion being 15 mm lower than the depth of the tin liquid, so that the blocking portion is completely submerged in the tin liquid, thereby ensuring the stability of the tin liquid flow in the tin bath, reducing the backflow of the cold tin liquid to the upstream, and thus increasing the stability of the glass ribbon on the tin liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of the submersible flag blocking device of the present invention (with the fixing bracket omitted).

[0017] Figure 2 It is a schematic diagram of the combined structure of the tin bath body and the submersible flag blocking device (fixed bracket omitted).

[0018] Explanation of the accompanying reference numerals: graphite plate-1; water-cooling support tube-2; blocking portion-3; connecting portion-4; side wall-5; groove bottom-6; glass-7. DETAILED DESCRIPTION

[0019] Example 1: Figure 1 As shown, the submersible flag-blocking device for a tin bath comprises a graphite plate 1 for preventing molten tin backflow, a water-cooled support tube 2, and a fixed bracket. The graphite plate 1 is formed by integrally connecting a blocking portion 3 and a connecting portion 4. The longitudinal section of the graphite plate 1 is approximately L-shaped. The top of the connecting portion 4 of the graphite plate 1 is fixedly connected to the front end of the water-cooled support tube 2, and the rear end of the water-cooled support tube 2 is connected to the fixed bracket.

[0020] like Figure 2As shown, when the submersible flag-blocking device is placed in the tin bath, the tail end of the blocking portion 3 of the graphite plate 1 is close to the side wall 5 of the tin bath, the bottom end of the blocking portion 3 is in close contact with the bottom 6 of the tin bath, and the front end of the blocking portion 3 is located directly below the glass 7 floating on the tin liquid. The height of the blocking portion 3 is 15 mm lower than the depth of the tin liquid at its installation position.

[0021] In this embodiment, the front end surface of the blocking portion 3 is an inclined surface that is inclined downward, thereby effectively preventing the blocking portion 3 from scratching the glass 7 floating on the tin liquid when it is immersed in the tin bath.

[0022] In this embodiment, the blocking portion 3 of the submerged flag device used in the wide section of the tin bath is immersed in the tin liquid, and the front end of the blocking portion 3 of the graphite plate 1 extends to directly below the glass 7 floating on the tin liquid. In this embodiment, the length of the blocking portion 3 is preferably 1000 mm, that is, the total length of the bottom end of the blocking portion 3 is 1000 mm, wherein the horizontal length of the front end inclined surface of the blocking portion 3 is approximately 50 mm; this is beneficial to ensure the stability of the tin liquid flow in the tin bath, reduce the cold tin liquid backflowing upstream, and thereby increase the stability of the glass ribbon on the tin liquid.

[0023] In this embodiment, the water-cooling support tube 2 includes a hollow inner tube and an outer tube. The outer tube is sleeved on the outside of the inner tube. A water inlet channel is provided between the inner wall of the outer tube and the outer wall of the inner tube. A return water channel is provided on the inner side of the inner tube. A water inlet is provided at the rear end of the outer tube, and a return water port is provided at the rear end of the inner tube.

[0024] Example 2: Figure 2 As shown, a float glass tin bath comprises a tin bath body and multiple pairs of submersible flag devices for the tin bath as described in Example 1. The tin bath body comprises an inlet, a wide section, a constricted section, and a narrow section, sequentially arranged along the length of the tin bath body. Each pair of submersible flag devices is positioned on opposite sides of the tin bath body, with multiple pairs of submersible flag devices spaced along the length of the wide section of the tin bath body. In this embodiment, four to five pairs of submersible flag devices are spaced along the length of the wide section of the tin bath body.

[0025] The installation method of this embodiment is as follows: the graphite plate 1 of the submersible flag device is submerged perpendicular to the molten tin surface into the tin bath body. Each pair of submersible flag devices is symmetrically positioned on the left and right sides of the tin bath body. The tail end of the blocking portion 3 of the graphite plate 1 abuts the tin bath sidewall 5, the bottom end of the blocking portion 3 is in close contact with the tin bath bottom 6, and the front end of the blocking portion 3 is directly below the glass 7 floating on the tin bath. The height of the blocking portion 3 is 15 mm lower than the depth of the tin bath at its installation location. The fixing bracket is adjusted to control the blocking portion 3 of the graphite plate 1 to not float above the tin bath surface.

[0026] When the wide section of the tin bath was divided into 10 equal bays along the length of the tin bath, the conventional 500mm-long flag at bay 7 (the flag's height was above the tin liquid level) was replaced with the 1000mm-long submersible flag device described in Example 1. Without changing process conditions, the temperature difference between the tin liquid at bay 7 and bay 9 increased from 30°C to 40°C. This demonstrates that the submersible flag device provided by the present invention helps ensure the stability of the tin liquid flow within the tin bath, reduces the backflow of cold tin liquid upstream, and thus improves the stability of the glass ribbon on the tin liquid.

[0027] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A submersible flag blocking device for a tin bath, characterized in that: It includes a graphite plate for blocking the backflow of tin liquid, a water-cooling support tube and a fixed bracket. The graphite plate consists of a blocking portion and a connecting portion. The longitudinal section of the graphite plate is L-shaped. The top of the connecting portion of the graphite plate is fixedly connected to the front end of the water-cooling support tube, and the rear end of the water-cooling support tube is connected to the fixed bracket. When the submersible flag barrier device is placed in the tin bath, the tail end of the barrier is close to the side wall of the tin bath, the bottom end of the barrier is in close contact with the bottom of the tin bath, the front end of the barrier is located directly below the glass floating on the tin liquid, and the height of the barrier is 15 mm lower than the depth of the tin liquid.

2. The submersible flag blocking device for a tin bath according to claim 1, characterized in that: The front end surface of the blocking portion is an inclined surface inclined obliquely downward.

3. The submersible flag blocking device for a tin bath according to claim 2, characterized in that: The length of the blocking portion is 1000 mm.

4. The submersible flag blocking device for a tin bath according to claim 3, characterized in that: The blocking portion and the connecting portion are of integrated design.

5. The submersible flag blocking device for a tin bath according to claim 4, characterized in that: The water-cooling support tube includes a hollow inner tube and an outer tube, the outer tube is sleeved on the outside of the inner tube, a water inlet channel is provided between the inner wall of the outer tube and the outer wall of the inner tube, a return water channel is provided on the inner side of the inner tube, a water inlet is provided at the rear end of the outer tube, and a return water port is provided at the rear end of the inner tube.

6. A float glass tin bath, characterized in that: The invention comprises a tin bath body and a plurality of pairs of submersible flag-blocking devices for the tin bath as described in any one of claims 1 to 5, wherein each pair of the submersible flag-blocking devices is arranged on opposite sides of the tin bath body, and the plurality of pairs of the submersible flag-blocking devices are arranged at intervals in the wide section of the tin bath body along the length direction of the tin bath body.

7. The float glass tin bath according to claim 6, characterized in that: The wide section of the tin bath body is provided with 4-5 pairs of submerged flag blocking devices at intervals along the length direction of the tin bath body.

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