A non-uniformly spaced cooling air grille

Abstract

A non-uniformly spaced cooling air grid relates to a tempered glass production device, which has multiple cooling air zones in the conveying direction of the conveying roller, and the blowing nozzles in each cooling air zone have the same wind pressure. In a cooling air zone connected to a glass heating furnace, the conveying rollers are arranged in non-uniform spacing, and the roller spacing at one end close to the output direction of the conveying rollers is larger than that at the other end. The blowing nozzles are also arranged in non-uniform spacing, and the blowing nozzles at one end close to the output direction of the conveying rollers have the same wind pressure and a larger distribution spacing compared with the blowing nozzles at one end close to the input direction, forming different air flow density distributions in the glass conveying direction. While meeting the demand for glass to be discharged from the furnace, the spacing between subsequent blowing nozzles is increased to improve the hot air discharge efficiency. It does not affect the cooling uniformity of the glass in the conveying direction, and reduces the difference in cooling speed between the middle and the edge in the width direction of the glass, thereby improving the quality of the glass.

Description

Technical Field

[0001] The invention relates to tempered glass production equipment, in particular to a non-uniformly spaced cooling air grid of glass tempering equipment. Background Art

[0002] The cooling air grid in the glass tempering unit is used to temper, semi-temper and cool the heated glass. For the reciprocating glass tempering unit, the glass swings back and forth in the cooling air grid when tempering. To ensure uniform cooling of the glass, the spacing between the cooling air grid nozzles and the roller spacing is evenly arranged. For glass tempering units used in some special occasions, during the tempering process, the glass runs in one direction from the equipment inlet to the glass outlet without reciprocating motion. Each group of air nozzles blows air to the entire surface of the glass at one time.

[0003] At present, the spacing of cooling nozzles of glass tempering units on the market is usually set according to factors such as wind pressure, air volume, and glass temperature, while the glass tempering process usually requires the heated glass to be gradually cooled at different cooling rates. For this reason, the cooling section of the glass tempering unit is usually divided into multiple cooling air zones with different wind pressures. In the same cooling air zone with a certain wind pressure, the cooling air grid adopts a structure with uniform roller spacing and nozzle spacing, so as to maintain the uniformity of the glass cooling temperature in a section. Due to the requirements of the glass tempering process, it takes a certain amount of time for the glass to be rapidly cooled after leaving the heating furnace, and the wind grid cooling air zone for rapid cooling needs to be of sufficient length. In the case of increasingly thin glass produced by the glass tempering unit, the roller spacing needs to be compressed to a very small size to meet the needs of glass leaving the furnace. At the same time, due to the arrangement of equal roller spacing, the conveying rollers in a long cooling air zone connected to the heating furnace all adopt smaller roller spacing, such as CN208327809U and CN203683362U. Since the air nozzles are arranged between adjacent conveying rollers and the distance between the rollers is small, the distance between the air nozzles is also reduced accordingly. After the glass completely enters the cooling air grid from the heating furnace, the high-pressure air blown by the air nozzles to the glass does not have enough exhaust space, and the hot air after heat exchange with the glass cannot be discharged to the outside in time, which seriously affects the cooling and heat dissipation speed of the glass surface, especially the middle part, causing uneven cooling of the glass and deformation of the layout. At the same time, poor exhaust causes a lot of energy loss. Summary of the invention

[0004] The technical problem to be solved by the present invention is to improve the hot air exhaust efficiency of the cooling section of the cooling air grid after the glass is taken out of the furnace, reduce the uneven cooling of the middle and edge of the glass, and provide a non-uniformly spaced cooling air grid.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a non-uniformly spaced cooling air grid, including an air grid group arranged above and below the glass conveying roller, wherein a plurality of blowing nozzles facing the conveying roller are spaced apart and distributed along the conveying direction of the conveying roller in the air grid group, the air grid group has a plurality of cooling air zones in the conveying direction of the conveying roller, the blowing nozzles in each cooling air zone have the same wind pressure, in a cooling air zone connected to a glass heating furnace, the conveying roller opposite thereto adopts a non-uniformly spaced conveying roller arrangement mode, the end close to the output direction of the conveying roller has a larger roller spacing than the other end, and the blowing nozzles opposite to this section of the conveying roller also adopt a non-uniformly spaced arrangement mode, so that the blowing nozzles close to one end of the output direction of the conveying roller have the same wind pressure and a larger distribution spacing compared with the blowing nozzles close to one end of the input direction, thereby forming different airflow density distributions in the glass conveying direction.

[0006] Furthermore, the position of the blowing nozzle is opposite to the gap between adjacent conveying rollers in the conveying roller table.

[0007] Furthermore, the blowing nozzles above and below the conveying roller are arranged symmetrically up and down.

[0008] Furthermore, in a cooling air zone, the conveying roller conveyor opposite thereto is divided into a plurality of sections, and the section close to one end of the conveying roller conveyor in the output direction has a larger roller spacing than the section at the other end.

[0009] Furthermore, the conveying rollers in the same section of the conveying roller conveyor have the same roller spacing.

[0010] Furthermore, in the multiple segments of the conveyor roller, the conveyor rollers in some segments have the same roller spacing, and the conveyor rollers in other segments are arranged with non-uniform spacing, and the roller spacing at one end close to the output direction of the conveyor roller is larger than that at the other end.

[0011] Further, in a cooling air zone, the distribution spacing of the conveying rollers increases from the input end to the output end of the conveying roller table.

[0012] Furthermore, the distribution spacing of the conveying rollers increases in sequence according to a regular pattern, or increases step by step without a regular pattern.

[0013] Furthermore, in the wind grid group above the conveying roller, air pressure plates are provided between adjacent blowing nozzles.

[0014] Furthermore, the size of the air pressure plate is adapted to the spacing between adjacent blowing nozzles.

[0015] The beneficial effect of the present invention is that the conveying rollers and air nozzles in the cooling air zone with the same air pressure are arranged in non-uniform spacing, and while the glass discharge requirements are met with a smaller roller spacing, the spacing of subsequent air nozzles in the cooling air zone is increased to improve the hot air discharge efficiency. The arrangement of the air nozzles with the same air pressure but different distribution spacing forms different air flow density distributions in the glass conveying direction, further enhancing the flow and discharge efficiency of the hot air reflected from the glass. This structural method does not affect the cooling uniformity of the glass in the conveying direction, and reduces the difference in cooling speed between the middle and the edge in the width direction of the glass, thereby improving the quality of tempered glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of embodiment 2 of the present invention.

[0018] Markings in the figure: 1. Heating furnace, 2. Blowing nozzle, 3. Air pressure plate, 4. Glass, 5. Conveying roller. L1 and L2 represent different sections, and L3 represents the distance between two conveying rollers. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. The specific contents listed in the following embodiments are not limited to the technical features necessary for the technical problems to be solved by the technical solutions recorded in the claims. At the same time, the enumerated embodiments are only part of the present invention, not all embodiments.

[0020] like Figure 1 and 2 As shown, the cooling air grid of the glass includes an upper air grid group and a lower air grid group, which are respectively arranged above and below the conveying roller 5 of the glass, and are used to blow air to the upper and lower surfaces of the glass for cooling. In the upper air grid group and the lower air grid group, a plurality of blowing nozzles 2 are spaced apart along the conveying direction of the conveying roller 5. The blowing nozzles 2 are also spaced apart, and their setting positions are opposite to the gaps between adjacent conveying rollers in the conveying roller 5, usually at the center position between adjacent conveying rollers. The blowing nozzles 2 face the conveying roller 5, and are used to blow air to the surface of the glass. The blowing nozzles in the upper air grid group and the lower air grid group are usually arranged symmetrically up and down, with the upper and lower setting positions being opposite and the arrangement intervals being the same. However, according to actual needs, they can also be adjusted and changed accordingly.

[0021] The wind grid group of the glass cooling wind grid can be provided with multiple cooling wind zones according to the needs in the conveying direction of the conveying roller 5, and the blowing nozzle 2 of each cooling wind zone has the same wind pressure. The wind pressure and air volume of each cooling wind zone are determined according to different glass tempering processes. Figure 1 and 2In the illustrated embodiment, a cooling air zone connected to the glass heating furnace 1 is shown, in which each blowing nozzle 2 has the same blowing air pressure. The conveying roller 5 corresponding to the position of the cooling air zone adopts a non-uniformly spaced conveying roller arrangement mode, and the roller spacing near the heating furnace 1 is smaller to meet the demand for the glass to be discharged after heating and softening. The end near the output direction of the conveying roller 5 has a larger roller spacing than the other end to increase the exhaust space, which is conducive to the dissipation of the hot air reflected from the glass. The blowing nozzles 2 opposite to this section of the conveying roller 5 also adopt a non-uniformly spaced arrangement mode. The spacing between the blowing nozzles near the end of the output direction of the conveying roller is greater than the spacing between the blowing nozzles near the end of the input direction. In the glass conveying direction, each blowing nozzle has the same air pressure and different distribution spacing, forming different airflow density distributions in the glass conveying direction, which enhances the flow and discharge efficiency of the hot air reflected from the glass.

[0022] exist Figure 1 and 2 In the embodiment shown, a pressure plate 3 is provided between adjacent blowing nozzles 2 in the wind grid group above the conveying roller 5 to adjust the air flow above the glass. The width of the pressure plate 3 is adjusted accordingly according to the spacing between adjacent blowing nozzles 2.

[0023] The roller spacing of the conveyor roller 5 and the blowing nozzles in the wind grid group can be gradually increased according to a certain rule, or they can be increased irregularly. The specific value should be determined according to the glass thickness, layout, required wind eye density, return air interval, etc. For example, in a cooling air zone, the conveyor roller 5 opposite to it is divided into multiple sections, and the section close to one end of the output direction of the conveyor roller 5 has a larger roller spacing than the section at the other end. And the conveyor rollers in the same section have the same roller spacing. For example Figure 1In the embodiment 1 shown, the conveying roller 5 in the cooling air zone connected to the heating furnace 1 is divided into two sections, L1 and L2. The roller spacing and the spacing between the blowing nozzles 2 in section L1 are smaller, while the roller spacing and the spacing between the blowing nozzles 2 in section L2 are larger. After the glass 4 is heated to the softening point in the heating furnace 1, it is transported out and enters a cooling air zone of the cooling air grid under the transportation of the conveying roller 5. The roller spacing in the L1 section is smaller, which is used to receive the heated glass 4 transported from the heating furnace 1. The smaller roller spacing in the L1 section can ensure that the glass 4 runs stably during the transportation from the heating furnace 1 without wave bending. After the glass 4 passes through the L1 section, it is cooled by the upper and lower blowing nozzles 2. The front end of the glass 4 has a certain strength and can be transported smoothly and without damage on the conveying roller 5 with a larger roller spacing. At this time, entering the L2 section with a larger roller spacing will not cause any adverse effects on the glass 4. The spacing between the upper and lower blowing nozzles 2 in the L2 larger roller spacing section is also relatively large. Under the premise of meeting the wind pressure and blowing volume required for tempering the glass 4, the larger roller spacing here can ensure sufficient return air space, so that the cooling air blown onto the surface of the glass 4 can be smoothly discharged to the outside of the wind grid, which can not only meet the requirement of uniform cooling of the glass 4, but also reduce the energy loss of the cooling system and improve energy utilization.

[0024] Figure 2 In the embodiment 2 shown, L3 represents the distance between two conveyor rollers in the conveyor roller 5. From the first conveyor roller close to the heating furnace 1 to the last conveyor roller far from the heating furnace 1, the roller distance changes incrementally. This change meets the demand for gradually cooling and hardening glass conveying. The incremental change can be a regular incremental series, with the same incremental amount or gradually increasing according to a certain regular incremental amount. The incremental change can also be irregular, with an irregular incremental amount.

[0025] In an embodiment without drawings, Figure 1 and Figure 2 In the embodiment, the arrangement is combined, in a cooling air zone, the conveying roller 5 opposite thereto is divided into a plurality of sections. Some of the sections refer to Figure 1 In the embodiment, the rollers have the same roller spacing, and the segment near one end of the conveyor roller 5 in the output direction has a larger roller spacing than the segment at the other end. Figure 2 In the embodiment, the conveying rollers are arranged at non-equidistant intervals, and one end close to the output direction of the conveying roller table has a larger roller spacing than the other end.

[0026] Compared with the usual method of uniformly arranging roller spacing in a cooling air zone, the glass cooling air grid of the present invention has better flatness and quality after tempering. According to comparative tests, for the same tempered glass with a thickness of 3.2mm, a length of 2280mm and a width of 1150mm, the glass heating furnace sets the same process parameters, and the length of a cooling zone connected to the heating furnace is 2900mm. In the cooling zone, the embodiment adopts non-equidistant arrangement of conveying rollers and blowing nozzles, which are arranged in two sections, the first section is 630mm long, the roller spacing is 90mm, and the second section is 2200mm long, and the roller spacing is 100mm. The comparative example adopts equidistant arrangement of conveying rollers and blowing nozzles, and the roller spacing is 90mm. The subsequent equipment and process of the cooling zone are the same as those of the embodiment and the comparative example. After the glass tempering process, there is a slight bulging phenomenon in the middle of the tempered glass of the comparative example, and the tempered glass of the embodiment of the present invention has no bulging, and the flatness and surface optical properties are better than the tempered glass of the comparative example, and the stress value can be the same as the tempered glass of the comparative example, and the energy consumption of the embodiment is significantly reduced. It is shown that the structure of the glass cooling air grille of the present invention does not affect the cooling uniformity of the glass in the conveying direction, but reduces the difference in cooling speed between the middle and the edge in the width direction of the glass, thereby improving the quality of the tempered glass.

[0027] The above description of the specific implementation mode is only used to help understand the technical concept and core idea of ​​the present invention. Although the technical solution is described and illustrated using a specific preferred embodiment, it should not be understood as a limitation of the present invention itself. Those skilled in the art may make various changes in form and details without departing from the technical concept of the present invention. These easily conceived changes or substitutions should all be included in the protection scope of the present invention.

Claims

1. A non-uniformly spaced cooling air grille, comprising an air grille group arranged above and below a glass conveying roller (5), wherein a plurality of blowing nozzles (2) facing the conveying roller are distributed at intervals in the air grille group along the conveying direction of the conveying roller (5), wherein the air grille group has a plurality of cooling air zones in the conveying direction of the conveying roller (5), and the blowing nozzles (2) in each cooling air zone have the same air pressure, Features: In a cooling air zone connected to a glass heating furnace, a conveying roller (5) opposite thereto adopts a conveying roller arrangement method with non-uniform spacing, and the roller spacing at one end close to the output direction of the conveying roller (5) is larger than that at the other end, and the blowing nozzles (2) opposite to the section of the conveying roller (5) also adopt a non-uniform spacing arrangement method, so that the blowing nozzles close to the output direction end of the conveying roller have the same wind pressure and a larger distribution spacing as the blowing nozzles close to the input direction end, thereby forming different airflow density distributions in the glass conveying direction; The position of the blowing nozzle (2) is opposite to the gap between adjacent conveying rollers in the conveying roller conveyor (5).

2. The non-uniformly spaced cooling air grille according to claim 1, Features: The blowing nozzles (2) above and below the conveying roller (5) are arranged symmetrically up and down.

3. The non-uniformly spaced cooling air grille according to claim 1, Features: In a cooling air zone connected to a glass heating furnace, a conveying roller conveyor (5) opposite thereto is divided into a plurality of sections, and a section close to one end of the conveying roller conveyor (5) in the output direction has a larger roller spacing than a section at the other end.

4. The non-uniformly spaced cooling air grille according to claim 3, Features: The conveying rollers in the same section of the conveying roller conveyor (5) have the same roller spacing.

5. The non-uniformly spaced cooling air grille according to claim 3, Features: In the multiple segments of the conveyor roller conveyor (5), the conveyor rollers in some segments have the same roller spacing, and the conveyor rollers in other segments are arranged with non-uniform spacing, and the roller spacing at one end close to the output direction of the conveyor roller conveyor is larger than that at the other end.

6. The non-uniformly spaced cooling air grille according to claim 1, Features: In a cooling air zone connected to a glass heating furnace, the distribution spacing of the conveying rollers increases from the input end to the output end of the conveying roller table.

7. The non-uniformly spaced cooling air grille according to claim 6, Features: The distribution spacing of the conveying rollers increases in sequence according to a regular pattern, or increases step by step without a regular pattern.

8. The non-uniformly spaced cooling air grille according to claim 1, Features: In the wind grid group above the conveying roller (5), air pressure plates (3) are provided between adjacent air blowing nozzles (2).

9. The non-uniformly spaced cooling air grille according to claim 8, Features: The size of the air pressure plate (3) is adapted to the spacing between adjacent air blowing nozzles (2).

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