Tin bath capable of enabling tin ash to automatically flow to edge part

Abstract

The utility model discloses a tin bath allowing tin ash to automatically flow to the edge, and belongs to the technical field of float glass manufacturing. The tin bath comprises a tin liquor pool and small lug pools, one end of an inlet of the tin liquor pool is connected with the melting furnace, one end of an outlet of the tin liquor pool is connected with the annealing furnace, the tin liquor pool comprises a tin liquor pool bottom, an end wall and side walls, the tin liquor pool bottom is provided with mutually communicated relatively deep pool areas close to the end wall of the outlet of the tin bath, and the small lug pools are arranged on the side walls on the two sides of the tin liquor pool. A linear motor is mounted in the small lug pool; an inlet of the small lug pool is communicated with a relatively deep pool area close to the end wall of the tin liquid pool, an outlet of the small lug pool is communicated with a relatively deep pool area far away from the end wall, the relatively deep pool areas communicated with each other surround to form a pair of relatively shallow pool areas, and the relatively deep pool areas communicated with each other and the small lug pool form wide-path circulation. According to the utility model, the depth of local tin liquid at the outlet end in the tin bath is changed to form a wide circulation path with the small lug pools on the two sides, so that the tin ash cleaning effect near the central position of the wide tin bath is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of float glass manufacturing, in particular to a tin bath where tin ash automatically flows to the edge. Background Art

[0002] The tin bath is an important equipment in float glass manufacturing technology. The inlet end of the tin bath is connected to the melting furnace, and the outlet end of the tin bath is connected to the annealing furnace. The conventional tin bath body is a rectangular space composed of the tin bath molten pool bottom and side walls. The tin bath body contains molten tin, and the glass ribbon floats on the molten tin as a floating medium. When the glass ribbon moves from upstream to downstream, the lower surface of the glass ribbon contacts the molten tin. The purity of the molten tin has a great influence on the quality of the glass, especially the end wall triangle area at the outlet of the tin bath is prone to accumulation of tin ash.

[0003] The float process inevitably produces tin ash in the tin liquid. Usually, some means of cleaning the tin ash are used to clean the tin ash to reduce the number of tin defects under the glass belt. The conventional way to clean the tin ash is to install a cleaning device on both sides of the tin tank near the outlet. The working principle is that the natural tin liquid flow driven by the glass plate encounters the outlet end wall of the tin liquid pool, and a part of the tin liquid will turn 90 degrees and flow to the edge, bringing the tin ash to both sides and being captured by the cleaning devices installed on both sides. Usually there are two types of cleaning devices: one is to symmetrically set a pair of small ear pools on the side wall near the outlet of the tin tank, such as the invention application with publication number CN117623594A, each ear pool is installed with a linear motor, and the electromagnetic force is used to attract the tin liquid and the floating tin ash into the small ear pool, and the clean tin liquid is returned to the tin tank after filtering. This method has a limited range of action because the tin liquid flows in a short-circuit cycle. It can only attract the tin ash within about 1 meter of the tin bath side wall into the small ear pool. The width of the tin bath is usually more than 5 meters, so at least 3 meters in the middle is outside its range of action. The electromagnetic force of the linear motor cannot attract the tin ash in the triangular area below the glass belt at the center of the tin bath, and must rely on the natural tin flow to bring the tin ash in the middle to the edge. The second method is to set up a large ear pool mechanical slag remover, and use a graphite wheel to collect the tin ash into the large ear pool. This method has a smaller range of action and is more dependent on the natural tin liquid flow. As the tin bath becomes wider and wider, the pulling speed of the glass plate, especially the speed of thick glass, becomes slower and slower, and the natural tin flow is very weak. In fact, it is impossible to make the tin ash in the middle flow to the edge. In actual operation, workers need to regularly extend a long flat wooden strip or a packing steel strip from both sides of the tin bath, pull the wooden strip and steel strip to drive the tin liquid and tin ash to flow to the edge, and then be attracted into the small ear pool by the linear motor or collected into the large ear pool by the wheel. Obviously, this manual method is inefficient and ineffective, can only partially reduce the number of tin defects under the glass belt, and will introduce additional pollution.

[0004] In addition to the above methods, the utility model application with publication number CN219670354U discloses a device that uses an air blow pipe to blow the tin ash in the middle area to both sides, attempting to solve the problem of the tin ash in the middle not flowing. This method adds an air blow pipe in a small space, which greatly increases the risk of the glass ribbon touching foreign objects and causing surface scratches or even broken boards. The utility model application with publication number CN218478675U discloses a device for removing tin ash with a second linear motor. The second linear motor of the utility model has a large mechanical structure and occupies the space that must be left empty at the tail of the tin bath, which brings great risks. This place is an emergency station for handling glass ribbon broken accidents. Its importance is no less than the fire escape and should not be occupied. The utility model application with publication number CN206799422U discloses a method of setting a guide plate at the end of the tin bath, the purpose of which is to guide the natural tin liquid flow flowing through the guide plate from the middle to the two sides. However, because the float glass production technology has developed into a wide plate with slow speed, the natural tin flow is particularly weak, and it can be said that there is almost no flow to guide. In addition, there is a short-circuit cycle between the inlet and outlet of the small ear pools on both sides of the traditional side, which can promote the cleaning of tin ash near the side wall to a certain extent. However, in this solution, the short-circuit cycle between the inlet and outlet of the small ear pool is blocked by the guide plate, and the clean tin liquid flowing out of the small ear pool is forced to flow back upstream, affecting the cleaning effect of the 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. The utility model application with publication number CN218841940U discloses another method of attempting to direct the natural tin liquid flow to the edge, hoping to improve the working effect of the large-ear pool mechanical slag scraper. However, as mentioned above, the natural tin flow is already very weak and will not produce a tin liquid flow sufficient to direct the tin ash to the edge, and there is almost no flow to direct. And according to the design of the ear pools on both sides, this large ear pool does not have a tin liquid circulation loop, but only uses a graphite wheel to collect the tin ash floating on the surface of the tin liquid at the edge. Simply put, the ideas of these two utility models are to consider directing the middle natural liquid flow to the edge. How to achieve the cleaning of tin ash near the center of the wide tin bath without adding additional equipment or instruments is a problem that urgently needs to be solved in this field. Utility Model Content

[0005] In order to overcome the above problems, the utility model is based on a new idea and provides a tin bath in which tin ash automatically flows to the edge, and guides an additional controlled tin liquid flow other than the natural tin flow from the edge to the vicinity of the central axis of the tin liquid pool. According to the principle of conservation of mass, the tin liquid in the middle area will inevitably flow back to the edge, thereby driving the tin ash to automatically flow to the edge, changing the depth of the local tin liquid at the outlet end in the tin bath, forming a wide circulation with the small ear pools on both sides, and enhancing the tin ash cleaning effect near the center of the wide tin bath.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A tin trough in which tin ash automatically flows to the edge, the tin trough comprising a tin liquid pool and a small ear pool, an inlet end of the tin liquid pool being connected to a melting furnace, an outlet end of the tin liquid pool being connected to an annealing furnace, the tin liquid pool comprising a tin liquid pool bottom, an end wall and a side wall, the tin liquid pool bottom being provided with interconnected relatively deep pool areas at the end wall near the tin trough outlet, small ear pools being provided at the side walls on both sides of the tin liquid pool, linear motors being installed in the small ear pools; an inlet of the small ear pool being connected to a relatively deep pool area close to the end wall of the tin liquid pool, an outlet of the small ear pool being connected to a relatively deep pool area far from the end wall, the interconnected relatively deep pool areas surrounding each other form a pair of relatively shallow pool areas, and the interconnected relatively deep pool areas and the small ear pools forming a wide circulation passage.

[0008] Preferably, a tin liquid cooler is provided in the small ear pool.

[0009] Preferably, the distance between the downstream edge of the relatively shallow pool area and the tin bath outlet end wall is 100-1500 mm, more preferably 300-600 mm.

[0010] Preferably, the relatively shallow pool area is a boss structure arranged at the bottom of the tin liquid pool, and the number is 2. Two side walls far away from each other in a pair of relatively shallow pool areas are respectively connected to the side walls on both sides, and a gap is left between the two adjacent side walls, and the gap width is 100-3000mm, more preferably 300-1000mm. The depth of the tin liquid pool bottom at the gap is consistent with the depth of the upstream and downstream sides of the relatively shallow pool area or each is significantly deeper than the relatively shallow pool area.

[0011] Preferably, the boss structure is a right triangle, with the hypotenuse of the right triangle facing the upstream side relative to the shallow pool area.

[0012] Preferably, the relatively deep pool area is an open groove, and the upstream groove and the downstream groove are connected through a middle groove at the center axis of the tin liquid pool.

[0013] Preferably, the difference in pool depth between the relatively shallow pool area and the relatively deep pool area is 10-200 mm, more preferably 20-40 mm.

[0014] Preferably, the small ear pool outlet is a submerged outlet located below the liquid surface of the tin liquid, and the submerged outlet is close to the bottom of the tin liquid pool.

[0015] Preferably, from the inner side of the wall at the outlet end of the tin bath toward the upstream direction, the depth of the bottom of the tin liquid pool is: a relatively deep pool, a relatively shallow pool, and a relatively deep pool.

[0016] The utility model has the beneficial effects: the tin ash automatically flows to the edge of the tin bath disclosed by the utility model, by arranging interconnected relatively deep pool areas near the outlet of the tin liquid pool, wherein the small ear pool inlet is connected to the relatively deep pool area close to the end wall of the tin liquid pool, and the small ear pool outlet is connected to the relatively deep pool area far away from the end wall, and the interconnected relatively deep pool areas are surrounded to form a pair of relatively shallow pool areas, and by controlling the linear motors of the small ear pools on both sides of the tin liquid pool, with the help of the relatively shallow pool area between the inlet and outlet of the small ear pool, the clean tin liquid discharged from the small ear pool is hindered to a certain extent, forcing the bottom flow to bypass the interconnected relatively deep pool areas and flow through the center line area of ​​the tin bath, thereby further enhancing the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the first embodiment of the tin bath in which the tin ash automatically flows to the edge shown in the embodiment of the utility model;

[0018] Figure 2 This is the second embodiment of the tin bath in which the tin ash automatically flows to the edge shown in the embodiment of the utility model;

[0019] In the figure: 1-tin liquid pool, 2-small ear pool, 3-end wall, 4-side wall, 5-relatively shallow pool area, 6-linear motor, 7-upstream side groove, 8-downstream side groove, 9-middle groove, 10-glass belt. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model provides a tin trough in which tin ash flows to the edge automatically, the tin trough comprises a tin liquid pool 1 and a small ear pool 2, one end of the inlet of the tin liquid pool 1 is connected to the melting furnace, one end of the outlet of the tin liquid pool 1 is connected to the annealing furnace, the tin liquid pool 1 comprises a tin liquid pool bottom, an end wall 3 and a side wall 4, the tin liquid pool bottom is provided with a mutually communicating relatively deep pool area near the end wall of the tin trough outlet; the mutually communicating relatively deep pool area surrounds a pair of relatively shallow pool areas 5, the depths of the upstream side of the relatively shallow pool area and the downstream side of the relatively shallow pool area are consistent or significantly deeper than the relatively shallow pool area, and the pool depth difference between the relatively shallow pool area and the relatively deep pool area is 10-200mm, preferably 20-40mm; small ear pools 2 are provided at the side walls on both sides of the tin liquid pool, the inlet of the small ear pool is connected to the relatively deep pool area close to the end wall of the tin liquid pool, and the outlet of the small ear pool is connected to the relatively deep pool area away from the end wall, and a linear motor 6 and a tin liquid cooler are installed in the small ear pool. The mutually communicating relatively deep pool area and the small ear pool form a wide-path circulation. Here, upstream and downstream refer to the direction in which the glass moves from upstream to downstream.

[0022] The setting of the relatively shallow pool area of ​​the utility model hinders the channel for the tin liquid to reflux in the shortest path, that is, it weakens the short-circuit circulation generated by the traditional setting of small ear pools on both sides of the tin bath, forcing most of the circulating tin liquid to flow through the middle, and enhancing the wide-path circulation. The design of the relatively shallow pool area and the relatively deep pool area does not affect the natural flow of the tin liquid caused by the movement of the glass ribbon 10. The short-circuit circulation mentioned here means that the tin liquid only generates a circulation loop in the area near the small ear pool, and cannot act on the tin ash near the center of the wide tin bath; the wide-path circulation means that the circulating tin flow covers the tin ash near the center of the wide tin bath or spans the entire width of the tin bath. Since the small ear pool is located outside the tin bath, the temperature is lower than that in the tin liquid pool. The linear motor itself has a water cooling pipeline, which has a certain cooling effect on the tin liquid. The temperature of the tin liquid in the small ear pool can also be further reduced by installing a tin liquid cooler. The density of the tin liquid after cooling increases, and the tin liquid flowing back to the tin liquid pool forms a bottom flow, which can form a wide-path circulation along a relatively deep area.

[0023] The two ends of the small ear pool are respectively a small ear pool entrance and a small ear pool exit. The small ear pool entrance is open, and the small ear pool exit adopts a submerged outlet located below the tin liquid surface. After the tin liquid containing tin ash touches the outlet end wall, it flows into the small ear pool driven by the wide-path circulating liquid and the action of the linear motor. When the tin liquid flows through the small ear pool, the temperature decreases and the density is relatively large. At the small ear pool outlet, due to the use of a submerged outlet, the tin ash floating above the tin liquid is intercepted at the submerged outlet, and can be manually cleaned regularly or a channel for automatically flowing into the tin ash collection pool can be set, and the clean tin liquid near the bottom of the tin liquid pool flows back into the tin tank.

[0024] In a specific implementation of the present invention, the submerged outlet is close to the bottom of the tin liquid pool, and preferably the highest height of the submerged outlet is lower than the lowest height of a relatively shallow pool area.

[0025] like Figure 1 As shown, the utility model provides a method for realizing a tin bath in which tin ash automatically flows to the edge. The upstream depth of the tin bath is designed to be 50-250mm. A right-angled triangle boss structure is set as a pair of relatively shallow pool areas 5. One side of the right-angled triangle hypotenuse faces the upstream side of the boss. The number of bosses is 2. The two side walls far away from each other in a pair of bosses are respectively connected to the side walls on both sides. A gap is left between the two side walls close to each other. The depth of the bottom of the tin liquid pool at the gap is consistent with the depth of the upstream and downstream sides of the boss or each is significantly deeper than the boss. Taking the direction in the figure as an example, one end of the small ear pool close to the outlet end wall of the tin bath is used as the inlet, and one end of the small ear pool on the upstream side of the boss is used as the outlet. The settings of a pair of small ear pools are the same. At this time, the linear motors 6 in the small ear pools are controlled, and the thrust direction of the linear motors 6 in a pair of small ear pools is from downstream to upstream. The small ear pools and the bosses located at the upper part of the figure form a counterclockwise cycle, and the small ear pools and the bosses located at the lower part of the figure form a clockwise cycle. The two cycles converge in the central axis area of ​​the wide tin bath. This circulation flow pattern can completely eliminate any stagnation area near the center line of the tin bath, and can effectively enhance the tin ash cleaning effect near the center of the wide tin bath. The above two linear motors 6 are controlled by a program, and the thrust size and direction of the motors, working time and other parameters can be set according to actual requirements. The shape of the boss is not limited to a right triangle, but can also be other shapes.

[0026] like Figure 2 As shown, the utility model provides another implementation method of the tin trough that the tin ash automatically flows to the edge, and an open groove channel is set at the bottom of the tin liquid pool, wherein the upstream groove 7 and the downstream groove 8 are connected through the middle groove 9 at the central axis position of the tin liquid pool, and the upstream groove, the downstream groove, and the middle groove serve as a relatively deep pool area, and the part surrounded by the three forms a relatively shallow pool area. Taking the direction in the figure as an illustration, a pair of small ear pools are set at the side walls on both sides, and in the small ear pool located at the top of the figure, one end connected to the upstream groove is used as the outlet, and one end connected to the downstream groove is used as the inlet, and the setting of the pair of small ear pools is the same. At this time, the linear motor 6 in the small ear pool is controlled, and the thrust direction of the linear motor 6 in a pair of small ear pools is from downstream to upstream. The small ear pool located at the upper part of the figure and the upstream groove, the middle groove, and the downstream groove form a counterclockwise cycle, and the small ear pool located at the lower part of the figure and the upstream groove, the middle groove, and the downstream groove form a clockwise cycle. The two cycles converge in the central axis area of ​​the wide tin bath. This circulation flow pattern can completely eliminate any stagnation area near the center line of the tin bath, and can effectively enhance the tin ash cleaning effect near the center position of the wide tin bath. The above two linear motors 6 are controlled by a program, and the thrust size and direction of the motor, the working time and other parameters can be set according to actual requirements. The shape of the groove is not limited to the rectangle in the figure, but can also be other shapes.

[0027] The principle of the above two wide-path circulation methods to enhance the tin ash cleaning effect near the center of the wide tin bath is: when the tin liquid flows through the small ear pool, the temperature decreases and the density is relatively large. At the same time, under the action of the submerged outlet of the small ear pool, the tin liquid flow returning to the tin bath is mainly bottom flow. The relatively shallow pool area between the entrance and outlet of the small ear pool can hinder it, forcing the bottom flow to bypass the center line area of ​​the tin bath along the interconnected relatively deep pool area, further enhancing the cleaning effect.

[0028] The above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the contents disclosed by a person skilled in the art from the present invention should be considered as the protection scope of the present invention.

Claims

1. A tin bath in which tin ash automatically flows to the edge, 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, 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 bottom of the tin liquid pool is provided with interconnected relatively deep pool areas near the end wall of the tin bath outlet, and small ear pools are provided at the side walls on both sides of the tin liquid pool, and linear motors (6) are installed in the small ear pools; the inlet of the small ear pool is connected to the relatively deep pool area close to the end wall of the tin liquid pool, and the outlet of the small ear pool is connected to the relatively deep pool area away from the end wall. The interconnected relatively deep pool areas surround to form a pair of relatively shallow pool areas (5), and the interconnected relatively deep pool areas and the small ear pools form a wide circulation passage.

2. The tin bath with tin ash automatically flowing to the edge according to claim 1, characterized in that: A tin liquid cooler is arranged in the small ear pool.

3. The tin bath with tin ash automatically flowing to the edge according to claim 1, characterized in that: The relatively shallow pool area (5) is a boss structure arranged at the bottom of the tin liquid pool and the number is 2. Two side walls that are far away from each other in a pair of relatively shallow pool areas are respectively connected to the side walls on both sides, and a gap is left between the two adjacent side walls, and the width of the gap is 100-3000mm.

4. The tin bath with tin ash automatically flowing to the edge according to claim 3, characterized in that: The boss structure is a right triangle, and one side of the hypotenuse of the right triangle faces the upstream side of the relatively shallow pool area.

5. The tin bath with tin ash automatically flowing to the edge according to claim 1, characterized in that: The relatively deep pool area is an open groove, and the upstream groove (7) and the downstream groove (8) are connected through the middle groove (9) at the center axis of the tin liquid pool.

6. The tin bath with tin ash automatically flowing to the edge according to claim 1, characterized in that: The difference in pool depth between the relatively shallow pool area and the relatively deep pool area is 10-200 mm.

7. The tin bath with tin ash automatically flowing to the edge according to claim 1, characterized in that: The outlet of the small ear pool is a submerged outlet located below the liquid surface of the tin liquid, and the submerged outlet is close to the bottom of the tin liquid pool.

8. The tin bath with tin ash automatically flowing to the edge according to claim 1, characterized in that: From the inner side of the tin bath outlet wall toward the upstream direction, the depth of the tin liquid pool bottom is: relatively deep pool, relatively shallow pool, and relatively deep pool.

Images