A tin bath with a tin flow circulating secret passage at the tail end of the tank bottom

Abstract

The application discloses a tin bath with a tin flow circulating hidden passage at a tail end groove bottom, and belongs to the technical field of float glass manufacturing technology. The tin bath comprises a tin liquid pool and small ear pools. The inlet end of the tin liquid pool is connected with a melting furnace, and the outlet end of the tin liquid pool is connected with an annealing furnace. The tin liquid pool comprises a tin liquid pool bottom, end walls and side walls. Linear motors are installed in the small ear pools on the two sides. The inlets of the small ear pools are open and communicate with the tin liquid in the tin liquid pool. The outlets of the small ear pools are submerged outlets located in the interior of the tin liquid pool bottom. A hidden passage is arranged in the interior of the tin liquid pool bottom. The inlets of the hidden passage respectively communicate with the outlets of the small ear pools on the two sides. The outlet of the hidden passage is located near the central region of the end wall of the tin bath outlet end. According to the application, the tin flow circulating channel is formed between the hidden passage arranged in the groove bottom and the tin liquid at the end wall of the tin bath outlet. The controlled tin liquid flow pushed by the linear motor is guided to the middle region of the tail end of the tin bath through the circulating hidden passage, so that the tin liquid in the middle region flows to the two sides, and the tin ash cleaning effect is strengthened.

Description

Technical Field

[0001] This invention relates to the field of float glass manufacturing technology, and in particular to a tin bath with a tin flow circulation channel at the bottom of the tail end. Background Technology

[0002] The tin bath is an important piece of equipment in float glass manufacturing technology. One end of the tin bath is connected to the melting furnace, and the other end is connected to the annealing furnace. A typical tin bath is a rectangular space formed by the bottom and side walls of the molten tin pool. The tin bath contains molten tin, and the glass ribbon floats on the molten tin, which acts as a buoyancy medium. The lower surface of the glass ribbon is in contact with the molten tin. The purity of the molten tin has a significant impact on the quality of the glass, especially since tin ash tends to accumulate in the triangular area of ​​the end wall at the outlet of the tin bath.

[0003] When the float glass belt in the narrow section of the tin bath is pulled forward by the roller conveyor, it causes the molten tin beneath the glass belt to flow towards the outlet end of the tin bath. When it reaches the lip brick end wall at the outlet end, the molten tin sinks and flows back upstream. The tin ash in the middle area cannot flow to the edges, and it accumulates in the triangular area under the glass sheet, easily causing defects such as tin adhesion to the glass, affecting glass production and quality. In practice, workers need to periodically insert a long, flat wooden strip or a steel strapping into the tin bath from both sides, pulling the strip to move the molten tin and tin ash towards the edges, where it is then attracted by a linear motor into the small ear tank or collected by a rotary wheel into the large ear tank. Obviously, this manual method is inefficient and ineffective, only partially reducing the number of tin defects under the glass belt, and introducing additional contamination. In addition, some ash removal devices have been proposed.

[0004] Utility model application CN219670354U discloses a device that uses an air blowing pipe to blow tin ash from the central area to both sides, attempting to solve the problem of tin ash not flowing in the middle. This method, by adding an air blowing pipe in a confined space, greatly increases the risk of the glass strip coming into contact with foreign objects, causing surface scratches or even breakage. Invention application CN117623594A discloses a combination of a linear motor and small ear pools. Each ear pool is equipped with a linear motor, which uses electromagnetic force to attract molten tin and floating tin ash into the ear pools. After filtration, the clean molten tin flows back into the tin bath. This method has a limited range of effect because the molten tin flows in a short-circuit loop. It can only attract tin ash within about 1 meter of the edge of the tin bath into the ear pools. Since the width of the tin bath is usually over 5 meters, at least 3 meters in the middle are outside its range of effect. The electromagnetic force of the linear motor cannot attract the tin ash from the triangular area below the glass strip in the center of the tin bath; it must rely on natural tin flow to carry the tin ash from the middle to the edge. In addition, there is a large-diameter mechanical slag remover that uses a graphite rotor to collect tin ash into the large-diameter tank. This method has a smaller effective range and is more dependent on the natural flow of molten tin. Utility model application CN218478675U discloses a device for removing tin ash using a second linear motor. However, this second linear motor has a large mechanical structure, occupying a space that must be left empty at the end of the tin bath, posing a significant risk. This area is an emergency work station for handling glass strip breakage accidents, and its importance is no less than that of a fire escape; it should not be obstructed. Utility model application CN206799422U discloses a method of setting a guide plate at the end of the tin bath, aiming to guide the natural flow of molten tin from the middle to both sides. However, because float glass production technology has developed to a wide plate and slow speed, the natural tin flow is particularly weak, practically negligible. In addition, traditional small ear pools on both sides have a short-circuit circulation between the inlet and outlet. This short-circuit circulation can promote the cleaning of tin ash near the side wall to some extent. However, in this solution, the short-circuit circulation between the inlet and outlet of the small ear pool is blocked by the guide plate. The clean molten tin flowing out of the small ear pool is forced to flow back upstream, affecting the cleaning effect of tin ash near the side wall. More importantly, this method also cannot solve the problem of cleaning tin ash near the center of the wide tin bath. Utility model application with publication number CN218841940U discloses another method that attempts to guide the natural flow of molten tin to the side, hoping to improve the working effect of the mechanical slag remover of the large ear pool. However, as mentioned above, the natural tin flow is already very weak and will not produce enough molten tin flow to guide the tin ash to the side. There is almost no flow to guide. Furthermore, according to the design of its two ear pools, this large ear pool does not have a molten tin circulation loop. It only uses a graphite wheel to collect the tin ash floating on the surface of the molten tin at the side.

[0005] How to clean tin ash near the center of a wide tin bath without adding extra equipment or instruments is an urgent problem to be solved in this field. Summary of the Invention

[0006] To overcome the above problems, this invention provides a tin bath with a tin flow circulation channel at the bottom of the tail end, based on a new concept. By setting the channel at the bottom of the bath, a tin flow circulation channel is formed with the molten tin at the outlet end wall of the tin bath. The controlled molten tin flow driven by the linear motor is guided to the middle area of ​​the tail end of the tin bath through the circulation channel, so that the molten tin in the middle area flows to both sides, thereby enhancing the tin ash cleaning effect.

[0007] The technical solution adopted in this invention is as follows:

[0008] A tin bath with a tin flow circulation channel at the bottom of the tail end is disclosed. The tin bath includes a tin pool and small ear pools. One end of the tin pool inlet is connected to a melting furnace, and the other end of the tin pool outlet is connected to an annealing furnace. The tin pool includes a bottom, an end wall, and a side wall. The small ear pools are located on the side walls near the outlet of the tin bath. A linear motor is installed in the small ear pool. The inlet of the small ear pool is open and connected to the tin in the tin pool. The outlet of the small ear pool is a submerged outlet located inside the bottom of the tin pool. A channel is provided inside the bottom of the tin pool. The inlet of the channel is connected to the outlet of the small ear pool on both sides. The outlet of the channel is located near the central area of ​​the end wall near the outlet of the tin bath. The controlled flow of tin liquid flowing upward from the channel drives the tin liquid containing tin ash at the outlet end wall of the tin bath to flow to the small ear pools on the side.

[0009] Preferably, the number of tunnels is 2, with a pair of tunnels symmetrical about the central axis of the molten tin pool along the length direction, and each tunnel is set along the side wall and the end wall.

[0010] Preferably, the underground passage has a branch structure, including two branch passages and one confluence passage. The inlets of the two branch passages are respectively connected to the outlets of the small ear pools on both sides, and the outlets of the two branch passages are connected to the inlet of the confluence passage. The outlet of the confluence passage is connected to the molten tin in the molten tin pool.

[0011] Preferably, the manifold is arranged along the central axis of the molten tin pool in the length direction, and the outlet of the manifold is located near the central area of ​​the outlet end wall of the molten tin pool.

[0012] Preferably, the molten tin in the tunnel is separated from the molten tin in the molten tin pool by the tunnel top plate. The tunnel top plate has an outlet near the center area of ​​the end wall of the molten tin pool, and the outlet is the tunnel outlet.

[0013] Preferably, the material density of the top plate of the tunnel is lower than that of molten tin, and it is preferably a refractory material, and more preferably a graphite material.

[0014] Preferably, the top of the tunnel is an open dovetail structure that matches the tunnel top plate structure; the tunnel top plate floats on the top of the tunnel under the action of buoyancy and engages with the dovetail structure at the top of the tunnel.

[0015] Preferably, the top plate of the tunnel is flush with the bottom of the molten tin pool.

[0016] Preferably, the linear motors in the two small ear chambers have the same thrust direction, which is opposite to the glass belt movement direction, from downstream to upstream.

[0017] The beneficial effects of this invention are as follows: By setting up a hidden channel at the bottom of the tin bath, a tin flow circulation channel is formed with the tin liquid at the outlet end wall of the tin bath. The controlled tin liquid flow after being filtered by the ear pools on both sides is guided from the side to the vicinity of the central axis of the tin liquid bath, and then flows out from the center position of the outlet end wall of the tin bath from bottom to top, which drives the tin liquid containing tin ash to automatically flow to the side, thereby enhancing the tin ash cleaning effect near the center position of the wide tin bath. Attached Figure Description

[0018] Figure 1 This is a first embodiment of a tin bath with a tin flow circulation channel at the bottom of the tail end, as shown in the embodiments of the present invention;

[0019] Figure 2 This is a sectional view along line AA in the first embodiment;

[0020] Figure 3 This is a BB-directed sectional view in the first embodiment;

[0021] Figure 4 This is a second embodiment of the tin bath with a tin flow circulation channel at the bottom of the tail end, as shown in the embodiments of the present invention;

[0022] Figure 5 This is a CC-direction cross-sectional view in the second embodiment;

[0023] Figure 6 This is a DD-direction cross-sectional view in the second embodiment;

[0024] Figure 7 This is the third embodiment of the tin bath with a tin flow circulation channel at the bottom of the tail end as shown in the embodiments of the present invention;

[0025] Figure 8 This is a cross-sectional view along the EE direction in the third embodiment;

[0026] Figure 9 This is a cross-sectional view along the FF direction in the third embodiment;

[0027] In the diagram: 1-molten tin pool, 2-small ear pool, 3-end wall, 4-side wall, 5-linear motor, 6-hidden passage, 7-hidden passage entrance, 8-hidden passage exit, 9-branch passage, 10-converging passage, 11-hidden passage top plate, 12-glass strip. Detailed Implementation

[0028] 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.

[0029] This invention provides a tin bath with a tin flow circulation channel at the bottom of the tail end. The tin bath includes a tin pool 1 and a small ear pool 2. One end of the inlet of the tin pool 1 is connected to a melting furnace, and one end of the outlet of the tin pool 1 is connected to an annealing furnace. The tin pool 1 includes a tin pool bottom, an end wall 3, and a side wall 4. The small ear pool 2 is located on the side walls 4 near the outlet of the tin bath. A linear motor 5 is installed in the small ear pool 2. The inlet of the small ear pool 2 is open and connected to the tin liquid in the tin pool 1. The outlet of the small ear pool 2 is a submerged outlet located inside the bottom of the tin pool. A channel 6 is provided inside the bottom of the tin pool. The inlet 7 of the channel is connected to the outlet of the small ear pool 2 on both sides. The outlet 8 of the channel is located near the center area of ​​the end wall 3 near the outlet of the tin bath. The controlled tin liquid flow flowing upward from the channel 6 drives the tin liquid containing tin ash at the outlet end wall 3 of the tin bath to flow to the small ear pool 2 on the side. This invention creates a tin flow circulation channel by setting a hidden channel 6 at the bottom of the tin bath, which forms a tin flow circulation channel with the tin liquid at the tin bath outlet end wall 3. The controlled tin liquid flow filtered by the ear pools on both sides is guided from the side to the vicinity of the central axis of the tin liquid pool 1, and then flows out from the center position of the tin bath outlet end wall 3 from bottom to top, which drives the tin liquid containing tin ash to automatically flow to the side, thereby enhancing the tin ash cleaning effect near the center position of the wide tin bath.

[0030] like Figure 1-3As shown, this invention provides a first implementation of a solder bath with a solder flow circulation channel at the bottom of the tail end. In this embodiment, the channel 6 has a bifurcated structure, including two branch channels 9 and a confluence channel 10. The inlets of the two branch channels 9 are respectively connected to the outlets of the two small ear pools 2 on both sides, and the outlets of the two branch channels 9 are connected to the inlet of the confluence channel 10. The outlet of the confluence channel 10 is connected to the solder liquid in the solder bath 1. Taking the direction in the figure as an illustration, the end of the small ear pool 2 located near the outlet end wall 3 (downstream) of the solder bath serves as the small ear pool inlet, and the end of the small ear pool 2 located near the upstream serves as the small ear pool outlet. The two small ear pools 2 are configured identically, and the thrust direction of the linear motors 5 in the two small ear pools 2 is consistent, with the thrust direction from downstream to upstream. The hidden channel 6 between the outlets of the pair of small ear pools 2 is composed of two branch channels 9 and a confluence channel 10. The confluence channel 10 connects the branch channels 9 and the central area of ​​the outlet end wall 3. The confluence channel 10 is arranged along the central axis of the molten tin pool 1 along its length, and the outlet of the confluence channel 10 is located near the central area of ​​the outlet end wall 3 of the molten tin bath. Molten tin flowing from the upper ear pool 2 into the upper branch channel 9 and molten tin flowing from the lower ear pool 2 into the lower branch channel 9 converge at the inlet of the confluence channel 10. After encountering the end wall of the molten tin bath in the confluence channel 10, it flows upward from the outlet and merges with the molten tin in the large pool. This causes the molten tin containing tin ash to flow automatically to the side, where it is again attracted by the linear motor 5 into the two small ear pools 2, realizing a continuous flow of molten tin from the middle to both sides. Here, upstream and downstream refer to the direction of glass movement from upstream to downstream.

[0031] Because the outlet of the small ear pool 2 adopts a submerged outlet design, the molten tin flows into the small ear pool 2 under the action of the circulating liquid and the linear motor 5. When the molten tin flows through the small ear pool 2, the temperature decreases and the density is relatively large. The tin ash floating on the molten tin is intercepted at the submerged outlet and can be manually removed periodically or an automatic channel for flowing into the tin ash collection pool can be set up. The clean molten tin near the bottom flows into the dark channel 6 from the outlet of the small ear pool 2 and flows back into the molten tin pool 1 under the action of the circulation channel.

[0032] like Figure 4 As shown, this invention provides a second implementation of a tin bath with a tin flow circulation channel at the bottom of the tail end. Unlike the first implementation, the channel 6 is not directly formed by integrally machining a pre-reserved channel at the bottom of the tin bath. Instead, the tin in the channel 6 is separated from the tin in the tin bath 1 by a channel top plate 11. An outlet is formed in the middle of the channel top plate 11 near the outlet end wall 3; this outlet is the channel outlet 8. In this embodiment, the channel top plate 11 is made of refractory material or graphite material, such as... Figure 5-6As shown, the top of the underground passage 6 is an open dovetail structure that matches the structure of the underground passage top plate 11. Since the density of the plate of the underground passage top plate 11 is lighter than that of the molten tin, the underground passage top plate 11 floats on top of the molten tin in the underground passage 6 and engages with the dovetail structure at the top of the underground passage 6 to form a closed channel. The underground passage top plate 11 is flush with the bottom of the molten tin pool and does not affect the natural flow of molten tin caused by the movement of the glass strip 12.

[0033] like Figure 7 As shown, this invention provides a third implementation of a solder bath with a solder flow circulation channel at the bottom of the tail end. In this embodiment, the number of channels 6 is 2, and a pair of channels 6 are symmetrical about the central axis of the solder bath 1 along the length direction. Each channel 6 is set along the side wall and the end wall. Taking the direction in the figure as an illustration, the end of the small ear pool 2 located near the end wall 3 (downstream) of the solder bath outlet serves as the small ear pool inlet, and the end of the small ear pool 2 located near the upstream serves as the small ear pool outlet. The arrangement of the pair of small ear pools 2 is the same, and the thrust direction of the linear motors 5 in the two small ear pools 2 is consistent, with the thrust direction from downstream to upstream. The molten solder flowing from the upper ear pool 2 into the duct 6 flows through the upper duct 6, and the molten solder flowing from the lower ear pool 2 into the duct 6 flows through the lower duct 6. The two ducts 6 share a single duct outlet 8, located in the central area near the outlet wall 3 of the solder bath. The molten solder in the duct 6 flows out from the bottom, merging with the molten solder in the solder bath, causing the molten solder containing tin ash to automatically flow to the side and re-enter the two ear pools 2. Figure 8-9 As shown, similar to the second implementation, the molten tin in the underground channel 6 is separated from the molten tin in the molten tin pool 1 by the underground channel top plate 11. An outlet is opened in the middle of the underground channel top plate 11 near the outlet end wall 3 of the molten tin pool; this outlet is the underground channel outlet 8. In this embodiment, the underground channel top plate 11 is made of refractory material or graphite material. The top of the underground channel 6 has an open dovetail structure that matches the structure of the underground channel top plate 11. Since the density of the material of the underground channel top plate 11 is lighter than that of the molten tin, the underground channel top plate 11 floats on top of the molten tin in the underground channel 6, engaging with the dovetail structure at the top of the underground channel 6 to form an underground channel. The underground channel top plate 11 is flush with the bottom of the molten tin pool and does not affect the natural flow of the molten tin. This embodiment, through the underground channel arrangement along the wall of the molten tin pool, allows for convenient maintenance or replacement of damaged underground channel top plates 11 without interrupting production.

[0034] The above-mentioned tin bath operates in the same way. By controlling the linear motors 5 in a pair of small ear pools 2 to work in a thrust direction from downstream to upstream, the molten tin flows into the small ear pools 2, is filtered, and flows through the channel 6. Finally, it surges out from the center of the tin bath outlet end wall 3 from bottom to top, causing the molten tin containing tin ash to automatically flow to the side, thus enhancing the cleaning effect of tin ash near the center of the wide tin bath. The layout of the channel 6 is not limited; in addition to the layout given in the embodiment, other layouts are also possible.

[0035] The above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A tin bath with a tin flow circulation channel at the bottom of the tail end, the tin bath comprising a tin liquid pool (1) and a small ear pool (2), the inlet end of the tin liquid pool (1) being connected to a melting furnace, and the outlet end of the tin liquid pool (1) being connected to an annealing furnace, the tin liquid pool (1) comprising a tin liquid pool bottom, an end wall (3) and a side wall (4), characterized in that, The small ear pool (2) is located on the side walls (4) near the outlet of the tin bath. A linear motor (5) is installed in the small ear pool (2). The inlet of the small ear pool (2) is open and connected to the tin liquid in the tin bath (1). The outlet of the small ear pool (2) is a submerged outlet located inside the bottom of the tin bath. The bottom of the tin bath is provided with a hidden channel (6). The entrance (7) of the hidden channel is connected to the outlet of the small ear pool (2) on both sides. The outlet (8) of the hidden channel is located near the center area of ​​the end wall (3) near the outlet of the tin bath. The controlled flow of tin liquid flowing upward from the hidden channel drives the tin liquid with tin ash floating at the end wall (3) of the outlet of the tin bath to flow to the small ear pool (2) on the side.

2. The tin bath with a tin flow circulation channel at the bottom of the tail end as described in claim 1, characterized in that, The number of the underground passages (6) is 2. A pair of underground passages (6) are symmetrical about the central axis of the molten tin pool (1) along the length direction. Each underground passage (6) is set along the side wall and the end wall.

3. The tin bath with a tin flow circulation channel at the bottom of the tail end as described in claim 1, characterized in that, The underground passage (6) has a bifurcated structure, including two branch passages (9) and a confluence passage (10). The entrances of the two branch passages (9) are respectively connected to the outlets of the small ear pools (2) on both sides, and the outlets of the two branch passages (9) are connected to the entrance of the confluence passage (10). The outlet of the confluence passage (10) is connected to the molten tin in the molten tin pool (1).

4. The tin bath with a tin flow circulation channel at the bottom of the tail end as described in claim 3, characterized in that, The manifold (10) is arranged along the central axis of the tin bath (1) in the length direction, and the outlet of the manifold (10) is located near the central area of ​​the tin bath outlet end wall (3).

5. The tin bath with a tin flow circulation channel at the bottom of the tail end as described in claim 1, characterized in that, The molten tin in the underground channel (6) is separated from the molten tin in the molten tin pool (1) by the underground channel top plate (11). The underground channel top plate (11) has an outlet near the center area of ​​the molten tin pool outlet end wall (3). The outlet is the underground channel outlet (8).

6. The tin bath with a tin flow circulation channel at the bottom of the tail end as described in claim 5, characterized in that, The material of the top plate (11) of the underground passage is refractory material.

7. The tin bath with a tin flow circulation channel at the bottom of the tail end as described in claim 5, characterized in that, The top of the tunnel (6) is an open dovetail structure that matches the structure of the tunnel top plate (11); the tunnel top plate (11) floats on the top of the tunnel (6) under the action of buoyancy and is engaged with the dovetail structure at the top of the tunnel (6).

8. The tin bath with a tin flow circulation channel at the bottom of the tail end as described in claim 5, characterized in that, The top plate (11) of the underground passage is flush with the bottom of the molten tin pool.

9. The tin bath with a tin flow circulation channel at the bottom of the tail end as described in claim 1, characterized in that, The thrust direction of the linear motor (5) in the two small ear chambers (2) is the same, and the thrust direction is opposite to the glass belt movement direction.

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