Method for removing tin dust by tin liquid full-width circulating flow

Abstract

The application discloses a method for removing tin ash by tin liquid full-width circulating flow, and belongs to the technical field of float glass manufacturing. The method is applied to the outlet end of a float glass tin bath, a full-width circulating path connected with a pair of small ear pools is arranged in a tin liquid pool, the thrust directions of linear motors in the pair of small ear pools are opposite, tin liquid containing tin ash flows to one side small ear pool under the driving of the linear motor after colliding with the end wall of the tin bath, the tin liquid after intercepting the tin ash through the one side small ear pool flows into the other side small ear pool through the tin bath, and then flows back to the end wall of the tin bath through the other side small ear pool, so that the full-width circulating path removes the tin ash. The full-width circulating path is arranged in the tin liquid pool and connected with the pair of small ear pools, so that the full-width circulating path spans the width of the tin bath, the tin liquid is driven to flow in the full-width circulating path by two linear motors, and there is no stagnation area in the whole width of the tin bath.

Description

Technical Field

[0001] This invention relates to the field of float glass manufacturing technology, and in particular to a method for removing tin ash using a full-width circulating flow of molten tin. Background Technology

[0002] The tin bath is a crucial piece of equipment in float glass manufacturing technology. One end of the tin bath connects to the melting furnace, and the other end connects to the annealing furnace. A typical tin bath is a rectangular space formed by the bottom and sidewalls of the molten tin pool. The tin bath contains molten tin, and the glass ribbon floats on this molten tin, which acts as a buoyancy medium. As the glass ribbon moves from upstream to downstream, its lower surface remains in constant contact with the molten tin. The purity of the molten tin significantly impacts the quality of the glass, especially as tin ash tends to accumulate in the triangular area of ​​the endwall at the outlet of the tin bath.

[0003] The traditional method for cleaning tin dross involves symmetrically installing a pair of dross removal pools on the side wall near the outlet of the tin bath. Each dross removal pool is equipped with a linear motor, which uses electromagnetic force to attract molten tin and floating dross into the dross removal pool. Filtration is completed in the dross removal pool, with the floating dross remaining in the dross removal pool and the clean molten tin flowing back into the tin bath.

[0004] Under this setup, two circulating flows symmetrical about the central axis of the tin bath will form near the slag removal pool. A molten tin stagnation zone will appear near the central axis of the tin bath. The tin ash floating on the surface of the molten tin cannot be guided to either side of the tin bath. Especially as the tin bath becomes wider, the phenomenon of molten tin stagnation zone in the middle becomes more and more serious, which has become an urgent problem to be solved in this field. Summary of the Invention

[0005] To overcome the above problems, this invention proposes a method for removing tin ash by using a full-width circulating flow of molten tin. Unlike the traditional method of using symmetrical molten tin flow, this invention drives the molten tin to flow to one side of the molten tin by setting up a large circulation path that spans the width of the tin bath.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for removing tin ash using a full-width circulating flow of molten tin is applied to the outlet end of a tin bath in float glass manufacturing. The tin bath includes a molten tin pool and small ear pools. The small ear pools are located on the side walls on both sides of the tin bath outlet, and a linear motor is installed inside the small ear pools. A full-width circulation path connecting a pair of small ear pools is provided in the molten tin pool, and the full-width circulation path spans the width of the tin bath.

[0008] The method for removing tin ash includes:

[0009] One end of the small ear pool on one side of the molten tin pool is connected to the upstream end as the outlet end, and the other end is connected to the downstream end as the inlet end. The thrust direction of the linear motor in the small ear pool is controlled from downstream to upstream. The outlet end, inlet end and thrust direction of the linear motor in the small ear pool on the other side of the molten tin pool are opposite.

[0010] When molten tin containing tin ash comes into contact with the end wall of the tin bath, it flows to one side of the small ear pool under the drive of a linear motor. After the tin ash is intercepted by the small ear pool, the molten tin crosses the tin bath and flows into the other side of the small ear pool. It then flows back to the end wall of the tin bath through the other side of the small ear pool, thus realizing a full-width circulation path to remove tin ash.

[0011] Preferably, the molten tin pool between the pair of small ear pools is provided with a relatively deep pool area spanning the width of the tin bath. The relatively deep pool area is interconnected with the pair of small ear pools to form two channels spanning the width of the tin bath, namely a first channel and a second channel. The area between the first channel and the second channel is a relatively shallow pool area. The two channels and the small ear pools form a full-width circulation path surrounding the relatively shallow pool area.

[0012] Preferably, the depth difference between the relatively deep pool area and the relatively shallow pool area is 10-200 mm, and more preferably 20-40 mm.

[0013] Preferably, the first channel and the second channel are open grooves that span the width of the tin bath.

[0014] Preferably, the relatively shallow pool area is a boss structure set at the bottom of the molten tin pool, and the upstream and downstream sides of the boss structure form the first channel and the second channel.

[0015] Preferably, the distance between the first channel and the second channel does not exceed the distance between the outlet end and the inlet end of the small ear cistern.

[0016] Preferably, the small ear pool is equipped with a molten tin cooler.

[0017] Preferably, the upstream end of the small ear pool adopts a submerged flow channel located below the surface of the molten tin, with the submerged flow channel close to the bottom of the molten tin pool.

[0018] Preferably, the bottom of the molten tin pool is provided with a hidden channel connecting the upstream ends of the two small ear pools, and the downstream ends of the two small ear pools are open, with both open downstream ends connecting to the molten tin at the outlet end wall of the molten tin bath.

[0019] Preferably, the thrust direction of the linear motor adopts a periodic switching strategy to achieve the purpose of efficiently removing tin ash.

[0020] The beneficial effects of this invention are as follows: The method for removing solder ash by utilizing the full-width circulation flow of molten solder disclosed in this invention involves setting up a full-width circulation path connecting a pair of small ear pools in the molten solder pool, so that the full-width circulation path spans the width of the solder pool. The molten solder is driven to flow in the full-width circulation path by two linear motors, and there will be no stagnation area across the entire width of the solder pool. The two linear motors can periodically and automatically switch the thrust direction to achieve the purpose of efficiently removing solder ash. Attached Figure Description

[0021] Figure 1 This is the first embodiment of the method for removing tin ash using a full-width circulating flow of molten tin, as shown in the embodiments of the present invention;

[0022] Figure 2 This is a second embodiment of the method for removing tin ash using a full-width circulating flow of molten tin, as shown in the embodiments of the present invention;

[0023] Figure 3 This is the third embodiment of the method for removing tin ash using a full-width circulating flow of molten tin, as shown in the embodiments of the present invention;

[0024] In the diagram: 1-molten tin pool, 2-small ear pool, 3-end wall, 4-side wall, 5-linear motor, 6-bore, 7-groove, 8-dark channel, 9-glass strip. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides a method for removing tin ash using a full-width circulating flow of molten tin, applied to the outlet end of a tin bath in float glass manufacturing. The tin bath includes a molten tin pool 1 and a small ear pool 2. The small ear pool 2 is located at the side walls 4 on both sides of the tin bath outlet, and a linear motor 5 is installed inside the small ear pool 2. The molten tin pool 1 is provided with a full-width circulating passage connecting a pair of small ear pools 2, and the full-width circulating passage spans the width of the tin bath.

[0027] The methods for removing tin ash based on the above-mentioned full-width circulation path include:

[0028] One end of the small ear pool 2 on one side of the molten tin pool 1, which is connected to the upstream end, is used as the outlet end, and the other end, which is connected to the downstream end, is used as the inlet end. The thrust direction of the linear motor 5 in the small ear pool 2 is controlled from the downstream to the upstream. The outlet end, inlet end, and thrust direction of the linear motor 5 on the other side of the molten tin pool 1 are opposite. Here, upstream and downstream refer to the glass moving from upstream to downstream.

[0029] When the molten tin containing tin ash comes into contact with the end wall 3 of the tin bath, it flows to one side ear pool 2 under the drive of the linear motor 5. After the tin ash is intercepted by the ear pool 2, the molten tin flows across the tin bath and into the other side ear pool 2. It then flows back to the end wall 3 of the tin bath through the other side ear pool 2, thus realizing a full-width circulation path to remove tin ash.

[0030] In one specific embodiment of the present invention, such as Figure 1-2 As shown, the molten solder pool 1 between a pair of small ear pools 2 has a relatively deep pool area spanning the width of the solder bath. This relatively deep pool area is interconnected with the pair of small ear pools 2, forming two channels spanning the width of the solder bath: a first channel and a second channel. Between the first and second channels is a relatively shallow pool area. The two channels and the small ear pools 2 form a full-width circulation path surrounding the relatively shallow pool area. The distance between the first and second channels does not exceed the distance between the outlet and inlet ends of the small ear pool 2. The depth difference between the relatively deep and relatively shallow pool areas is 10-200 mm, preferably 20-40 mm. The depth of the small ear pool 2 is consistent with the depth of the bottom of the pools on both sides it connects to. A linear motor 5 and a molten solder cooler are installed inside the small ear pool 2. In this embodiment, the relatively shallow pool area hinders the shortest path for molten solder to return, thus weakening the short-circuit circulation generated by the traditional method of only setting small ear pools 2 on both sides of the solder bath. Combined with the forward and reverse rotation control of the motors on both sides, the circulating molten solder is forced to flow through the middle through a full-width circulation path, enhancing the wide-path circulation. The design of the shallow pool area does not affect the natural flow of molten solder caused by the movement of the glass belt 9. The short-circuit circulation mentioned here refers to the molten solder only generating a circulation loop in the area near the small ear pool 2, unable to act on the molten solder ash near the center of the wide solder bath; the wide-path circulation refers to the circulating molten solder flow spanning the entire width of the solder bath. Since the small ear pool 2 is located outside the solder bath, its temperature is lower than that inside the molten solder pool. The linear motor 5 itself has a water cooling pipe, which has a certain cooling effect on the molten solder. The temperature of the molten solder in the small ear pool 2 can be further reduced by installing a molten solder cooler or other methods. The density of the cooled molten solder increases, and the molten solder flowing back to the molten solder pool forms a bottom flow, which can form a full-width circulation path along the relatively deep first and second channels.

[0031] exist Figure 1In one implementation of the method for removing tin ash using a full-width circulating flow of molten tin, the relatively shallow pool area is a boss 6 structure located at the bottom of the molten tin pool 1. The upstream and downstream sides of the boss 6 structure form the first and second channels. Using the direction shown in the figure as an illustration, a pair of small ear pools 2 are located at the sidewalls 4 on both sides of the boss 6. The small ear pool 2 located at the upper part of the figure has its upstream side connected to the boss 6 as the outlet end and its downstream side connected to the boss 6 as the inlet end. The small ear pool 2 located at the lower part of the figure is the opposite. At this time, the linear motors 5 within the small ear pools 2 are controlled. The thrust direction of the linear motor 5 in the upper small ear pool 2 is from downstream to upstream, and the thrust direction of the linear motor 5 in the lower small ear pool 2 is from upstream to downstream. The upstream side of the boss 6, the lower small ear pool 2, the downstream side of the boss 6, and the upper small ear pool 2 form a counterclockwise full-width circulating path spanning the entire width of the molten tin pool. This circulating flow pattern can completely eliminate any stagnant areas near the center line of the molten tin pool, effectively enhancing the tin ash removal effect. The two linear motors 5 mentioned above are controlled by a program. The thrust, direction, working time and other parameters of the motors can be set according to actual requirements. The shape of the boss 6 is not limited to a rectangle, but can also be other shapes.

[0032] exist Figure 2 In another implementation of the method for removing tin ash using a full-width circulating flow of molten tin, the first and second channels are open grooves 7 spanning the width of the tin bath. The control process of this implementation is the same as that of the boss 6, except that the direction of the motor's thrust is changed. The first channel, the upper ear pool 2, the second channel, and the lower ear pool 2 form a clockwise full-width circulation path spanning the entire width of the tin bath. The principle is the same as above and will not be repeated here.

[0033] In both implementation methods described above, the upstream end of the small ear pool 2 adopts a submerged flow channel located below the surface of the molten tin. The submerged flow channel is close to the bottom of the molten tin pool 1, and preferably, the highest height of the submerged flow channel is lower than the lowest height of the relatively shallow pool area. The downstream end of the small ear pool 2 is an open opening. Only one side of the small ear pool simultaneously serves as a circulation path for intercepting molten tin ash and molten tin, while the other side of the small ear pool only serves as a circulation path for molten tin. By switching the thrust direction of the two linear motors, the functions of the two small ear pools can be switched. Since the temperature of the molten tin decreases and its density becomes relatively high when flowing through the small ear pool 2, the molten tin ash floating above the molten tin is intercepted at the submerged outlet of the small ear pool 2 due to the submerged outlet. It can be manually removed periodically or an automatic channel for flowing into the molten tin ash collection pool can be set up. The clean molten tin near the bottom of the molten tin pool 1 flows back into the molten tin bath.

[0034] In one specific embodiment of the present invention, such as Figure 3As shown, a hidden channel 8 is provided inside the bottom of the molten tin pool 1, connecting the upstream ends of the two small ear pools (including the outlet end of one small ear pool 2 and the inlet end of the other small ear pool 2). The downstream ends of the two small ear pools (including the inlet end of one small ear pool 2 and the outlet end of the other small ear pool 2) are open, and both open downstream ends are connected to the molten tin at the outlet end wall 3 of the molten tin bath. Taking the direction in the figure as an illustration, the hidden channel 8 is a straight structure. In the small ear pool 2 located at the top of the figure, one end connected to the hidden channel 8 serves as the outlet end, and the end connected to the molten tin at the outlet end wall 3 of the molten tin bath serves as the inlet end. The small ear pool 2 located at the bottom of the figure is the opposite. At this time, the linear motor 5 in the small ear pool 2 is controlled. The thrust direction of the linear motor 5 in the upper small ear pool 2 is from downstream to upstream, and the thrust direction of the linear motor 5 in the lower small ear pool 2 is from upstream to downstream. The molten tin containing tin ash flows towards the upper ear pool 2 after hitting the end wall 3 of the tin bath. The tin ash is intercepted in the ear pool 2, while the clean molten tin flows into the lower ear pool 2 through the channel 8. It then flows back from the outlet end of the lower ear pool 2 to the outlet end wall 3 of the tin bath. This creates a counter-clockwise full-width circulation path spanning the entire width of the tin bath, formed by the inner side of the outlet end wall 3, the upper ear pool 2, the channel 8, and the lower ear pool 2. This circulation flow pattern completely eliminates any stagnation areas near the center line of the tin bath, effectively enhancing the tin ash cleaning effect. The two linear motors 5 are program-controlled; the thrust, direction, and working time of the motors can all be set according to actual requirements. The shape of the channel 8 is not limited to a straight line and can also be other shapes.

[0035] The above examples are merely specific embodiments of the present invention. The clockwise / counterclockwise control method can be set according to the needs of those skilled in the art, with periodic switching of the thrust direction being preferred to achieve efficient removal of tin ash. Obviously, the present invention is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this invention should be considered within the scope of protection of this invention.

Claims

1. A method for removing tin ash using a full-width circulating flow of molten tin, applied to the outlet end of a float glass tin bath, wherein the tin bath includes a molten tin pool (1) and a small ear pool (2), the small ear pool (2) being located at the sidewalls (4) on both sides of the tin bath outlet, and a linear motor (5) is installed inside the small ear pool (2); characterized in that, The molten tin pool (1) is provided with a full-width circulation passage connecting a pair of small ear pools (2), the full-width circulation passage spanning the width of the molten tin pool; The method for removing tin ash includes: One end of the small ear pool (2) on one side of the molten tin pool (1) is connected to the upstream end as the outlet end and the other end is connected to the downstream end as the inlet end. The thrust direction of the linear motor (5) in the small ear pool (2) is controlled from the downstream to the upstream. The outlet end, inlet end and thrust direction of the linear motor (5) on the other side of the molten tin pool (1) are opposite. After the molten tin containing tin ash hits the end wall (3) of the tin bath, it flows to one side ear pool (2) under the drive of the linear motor (5). After the molten tin containing tin ash is intercepted by the ear pool (2), it crosses the tin bath and flows into the other side ear pool (2). It then flows back to the end wall (3) of the tin bath through the other side ear pool (2), thus realizing the full-width circulation path to remove tin ash. The full-width loop path is formed in one of the following two ways: A relatively deep pool area spanning the width of the tin bath is provided in the tin bath (1) between a pair of small ear pools (2). The relatively deep pool area is interconnected with the pair of small ear pools (2) to form two channels spanning the width of the tin bath, namely the first channel and the second channel. The area between the first channel and the second channel is a relatively shallow pool area. The two channels and the small ear pools (2) form a full-width circulation path around the relatively shallow pool area. Alternatively, the bottom of the molten tin pool is provided with a hidden channel (8) that connects the upstream end of the two small ear pools (2), and the downstream end of the two small ear pools (2) is open. Both open downstream ends are connected to the molten tin at the outlet end wall (3) of the molten tin pool. The hidden channel (8) and the two small ear pools (2) form a full-width circulation passage.

2. The method for removing tin ash using a full-width circulating flow of molten tin according to claim 1, characterized in that, The depth difference between the relatively deep pool area and the relatively shallow pool area is 10-200 mm.

3. The method for removing tin ash using a full-width circulating flow of molten tin according to claim 1, characterized in that, The first and second channels are open grooves (7) that span the width of the tin bath.

4. The method for removing tin ash using a full-width circulating flow of molten tin according to claim 1, characterized in that, The relatively shallow pool area is a boss (6) structure set at the bottom of the molten tin pool (1), and the upstream and downstream sides of the boss (6) structure form the first channel and the second channel.

5. The method for removing tin ash using a full-width circulating flow of molten tin according to claim 1, characterized in that, The distance between the first channel and the second channel shall not exceed the distance between the outlet and inlet of the small ear cistern (2).

6. The method for removing tin ash using a full-width circulating flow of molten tin according to claim 1, characterized in that, The small ear pool (2) is equipped with a molten tin cooler.

7. The method for removing tin ash using a full-width circulating flow of molten tin according to claim 1, characterized in that, The upstream end of the small ear pool (2) adopts a submerged flow hole located below the surface of the molten tin, and the submerged flow hole is close to the bottom of the molten tin pool (1).

8. The method for removing tin ash using a full-width circulating flow of molten tin according to claim 1, characterized in that, The thrust direction of the linear motor (5) adopts a periodic switching strategy.

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