A cooling air outlet mechanism for a glass tempering furnace

Abstract

The present invention relates to the field of glass physical tempering cooling, and specifically to a cooling air outlet mechanism for a glass tempering furnace. A cooling air outlet mechanism for a glass tempering furnace is provided, comprising a plurality of wind grille packages arranged up and down, the wind grille packages comprising a plurality of wind grille bars arranged in parallel, the wind grille bars being provided with air inlets, and a plurality of air outlets being provided on the side of the wind grille bars facing the roller of the tempering furnace, wherein the air outlets on each wind grille bar are arranged at intervals in the longitudinal direction, and the air outlets on two adjacent wind grille bars are arranged in a longitudinally staggered manner. By changing the arrangement of the air outlets on the wind grille bars, the longitudinal air outlets are also spaced apart like the transverse ones, and the longitudinal air outlet is intermittent and not distributed in a whole strip, thereby reducing the pressure difference of the wind force on the upper and lower surfaces of the glass plate, balancing the compressive stress on the upper and lower surfaces of the glass, making the wind pressure on the upper and lower surfaces of the glass more uniform, and greatly reducing the degree of bending of the four sides of the glass plate up and down, thereby effectively improving the problem of glass warping.

Description

Technical Field

[0001] The invention relates to the field of glass physical tempering cooling, and in particular to a cooling air outlet mechanism of a glass tempering furnace. Background Art

[0002] Tempered glass is a kind of safety glass and a kind of prestressed glass. To improve the strength of glass, chemical or physical methods are usually used to form compressive stress on the glass surface. When the glass is subjected to external force, the surface stress is first offset, thereby improving the bearing capacity and enhancing the glass's own resistance to wind pressure, cold and heat, impact, etc. Due to its characteristics, tempered glass is widely used in various fields, such as doors and windows of high-rise buildings, glass curtain walls, indoor partition glass, lighting ceilings, sightseeing elevator passages, furniture, glass guardrails, etc.

[0003] The tempered glass production lines currently used in the market usually include a loading table, a heating furnace, a cooling section and a lower table. The glass to be processed is loaded on the loading table, heated at high temperature in the heating furnace, strengthened and cooled in the cooling section by a fan, and unloaded on the lower table. The cooling air outlet structure in the prior art is a wind grid area composed of a number of wind grid packages arranged up and down. For example, a Chinese patent discloses a wind spot-free mechanism for a glass tempering furnace, application number CN201320108722.X, including a furnace body (1) and n air rows arranged in the furnace body (1), wherein n>2, characterized in that the surface of the first air row (2) of the n air rows is provided with an air outlet matrix (3), and the surfaces of the second to nth air rows of the n air rows are provided with obliquely arranged oblique air outlet groups (4).

[0004] The traditional wind grille package is composed of several wind grille bars, and the air outlets of the wind grille bars are arranged in a fully distributed manner, that is, the bottom of the wind grille bars will be covered. The roller conveyor used to transport glass is located between the upper and lower wind grille packages and is staggered and spaced between the wind grille bars. The obstruction of the roller conveyor causes the distribution of the horizontal and vertical air outlets to be inconsistent, with the horizontal distribution being intermittent and the vertical distribution being comprehensive.

[0005] When the glass is cooled in the wind grid section, there are two movement states. The first is to swing back and forth at a uniform speed. The second is to slow down at the swing point, stop, and accelerate in the opposite direction. In the first case, the uneven distribution of air outlets can be made uniform through movement. In the second case, the amount of wind received by the glass in the horizontal direction and in the vertical direction is not equal, so the glass tempering furnace has a characteristic: the side arch parallel to the roller is easy to bend upward; the side arch perpendicular to the roller is easy to bend downward. The uneven wind on the upper and lower surfaces of the glass makes the glass prone to warping and deformation, especially the arch of the long side of the long strip of glass is obviously different when placed horizontally and vertically, which seriously affects the quality of the glass products. Summary of the invention

[0006] In order to solve the problem of glass being easily warped in the prior art, the present invention provides a cooling air outlet mechanism for a glass tempering furnace from the perspective of glass cooling method, thereby improving the warping degree of the glass and improving product quality.

[0007] The present invention provides a cooling air outlet mechanism for a glass tempering furnace, comprising a plurality of wind grille packages arranged up and down, the wind grille packages comprising a plurality of wind grille bars arranged in parallel, air inlets being arranged on the wind grille bars, a plurality of air outlets being arranged on a side of the wind grille bars facing a roller conveyor of the tempering furnace, wherein the air outlets on each wind grille bar are arranged at intervals in the longitudinal direction, and the air outlets on two adjacent wind grille bars are arranged in a staggered manner in the longitudinal direction.

[0008] Furthermore, the air outlets on at least two air grille bars are combined to cover the entire glass plate on the roller conveyor of the tempering furnace in the horizontal projection.

[0009] Furthermore, the air outlet is composed of a plurality of air outlet holes.

[0010] Furthermore, the air outlet holes are arranged in a staggered manner.

[0011] In the present invention, by changing the arrangement of the air outlets on the wind grid strips, the longitudinal air outlets are also spaced apart like the transverse ones, and the longitudinal air outlets are intermittent and not distributed in a whole strip, thereby reducing the pressure difference of the wind force on the upper and lower surfaces of the glass plate, balancing the compressive stress on the upper and lower surfaces of the glass, making the wind pressure on the upper and lower surfaces of the glass more uniform, and greatly reducing the degree of bending of the four sides of the glass plate, thereby effectively improving the problem of glass warping. When the glass is slow and stationary, the wind rate in both the longitudinal and transverse directions is equal. At the same time, since the glass moves transversely, the longitudinal intervals cannot form a straight line in the transverse direction, and the air outlets of two adjacent wind grid strips are staggered. After the glass moves, the wind rate in both the longitudinal and transverse directions is also equal.

[0012] By means of the wind grid bar structure of the present invention, the waveform deformation can be controlled below 3‰, thereby greatly improving the product quality of the glass plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the wind grid package in the present invention.

[0014] Figure 2 yes Figure 1 A partial enlarged view of the .

[0015] Figure 3 It is a structural schematic diagram of the cooling section of the tempering furnace.

[0016] Figure 4 It is a three-dimensional schematic diagram of the coordination between the upper and lower air grille packages and the roller table.

[0017] Figure 5 It is a front view schematic diagram of the coordination between the upper and lower air grille packages and the roller table.

[0018] Figure 6 It is a structural diagram of the air outlet arrangement of the wind grille in the prior art.

[0019] Figure 7 This is a simplified diagram of the effect of moving the glass plate.

[0020] Figure 8 This is a comparison table before and after the implementation of a 3m*5m tempering furnace and nearly square glass.

[0021] Fig. 9 This is a comparison table before and after the implementation of a 3m*5m tempered furnace and mixed placement of rectangular glass.

[0022] In the figure, 1, wind grille package; 11, upper wind grille package; 12, lower wind grille package; 2, wind grille bars; 3, air inlet; 4, air outlet; 5, tempering furnace roller; 6, glass plate; 7, air outlet; 1', existing wind grille package; 2', existing wind grille bars; 4', existing air outlet. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] like Figure 3-7 As shown, the glass tempering furnace of the prior art comprises a loading platform, a heating furnace, a cooling section and a lowering platform. The glass plate 6 is carried by the tempering furnace roller 5 and passes through the loading platform, the heating furnace, the cooling section and the lowering platform in sequence. The heated glass plate is cooled in the cooling section. Figure 3 This is a structural diagram of the cooling section of the tempering furnace.

[0025] The cooling air outlet mechanism is supplied with air by a fan (not shown) to cool the glass. The cooling air outlet mechanism includes a plurality of wind grille packages 1 arranged vertically. The wind grille packages 1 include a plurality of wind grille bars 2 arranged in parallel. The wind grille bars 2 are provided with air inlets 3. The wind grille bars 2 are provided with a plurality of air outlets 4 on one side facing the roller 5 of the tempering furnace.

[0026] In specific application, the air grille packages 1 are symmetrically arranged above and below the tempering furnace roller 5, and the air outlets of the upper air grille package 11 and the lower air grille package 12 face the tempering furnace roller 5. The tempering furnace roller 5 is arranged between the air grille bars 2 at intervals and located between the upper air grille package 11 and the lower air grille package 12. The glass plate 6 is transported horizontally along the tempering furnace roller, and the upper air grille package 11 and the lower air grille package simultaneously discharge air to cool the glass plate.

[0027] After the glass is heated to its softening point and then cooled rapidly, sufficient compressive stress is generated on the surface of the glass. The process of generating tensile stress inside the glass that is balanced with the compressive stress is called glass tempering. When tempered glass is subjected to external force, compressive stress is first released, and then tensile stress is generated on the surface of the glass, making the strength of tempered glass higher than that of ordinary glass. Tempered glass is glass with stress, and it will also deform when the stress inside the glass is unbalanced: when the compressive stress on the upper surface is greater than that on the lower surface, it is balanced stress and the glass bends downward. Similarly, when the compressive stress on the lower surface is greater than that on the upper surface, it is balanced stress and the glass bends upward. During the cooling process of the glass, due to the uneven cooling speed of the upper and lower surfaces, the stress generated on the surface with a faster cooling speed is greater than that on the surface with a slower cooling speed.

[0028] like Figure 7 As shown, the glass plate 6 enters the cooling zone along the roller conveyor 5 of the tempering furnace, and the four corner points of the glass plate 6 are marked as ABCD, wherein the AB / CD side is longitudinal, and the AC / BD side is transverse in accordance with the conveying mode of the glass plate 6. The existing air outlet 4' of the air grille bar 2' on the air grille package 1' in the prior art covers the entire air grille bar 2', such as Figure 6 As shown, when the glass plate 6 is stationary (for example, when the glass plate is reciprocatingly cooled, the glass plate is stationary during the motor start and stop process), at this time, combined with Figure 5 It can be seen that the upper surface of the glass plate 6 is fully exposed to the wind, while due to the existence of the roller, the lower surface of the glass plate 6 is in contact with the roller, and the wind pressure it is subjected to is partially blocked by the roller.

[0029] Due to the obstruction of the roller in the lateral direction, there is no wind pressure in part of the lower surface of the glass plate 6 in the lateral direction, which makes the wind pressure on the upper surface of the AC / BD side of the glass plate greater than the wind pressure on the lower surface, and the AC / BD side is easy to bend downward in a "⌒" shape; and due to the obstruction of the roller, the wind pressure on the lower surface of the glass plate in the longitudinal direction is relatively concentrated, and the wind pressure on the upper surface of the AB / CD side is less than the wind pressure on the lower surface, and AB / CD is easy to warp upward in a "︶" shape, and finally the glass plate is deformed in an S shape with a high degree of warping and poor product quality.

[0030] In this embodiment, Figure 1 , 2 As shown, the cooling air outlet mechanism of the glass tempering furnace includes a plurality of wind grille packages 1 arranged up and down, the wind grille packages 1 include a plurality of wind grille bars 2 arranged in parallel, the wind grille bars 2 are provided with air inlets 3, and a plurality of air outlets 4 are provided on the side of the wind grille bars 2 facing the roller conveyor 5 of the tempering furnace, wherein the air outlets 4 on each wind grille bar 2 are arranged at intervals longitudinally, and the air outlets 4 on two adjacent wind grille bars 2 are arranged in a staggered manner longitudinally.

[0031] In the present invention, by changing the arrangement of the air outlet 4 on the wind grid bar 2, the air outlet area of ​​a single wind grid bar is smaller than that of the traditional wind grid bar, and the influence on the upper surface of the glass plate is greater. The longitudinal air outlet is also spaced like the transverse air outlet, and the longitudinal air outlet is intermittent and not distributed in a whole strip, thereby reducing the pressure difference of the wind force on the upper and lower surfaces of the glass plate, balancing the compressive stress on the upper and lower surfaces of the glass, and making the wind pressure on the upper and lower surfaces of the glass more uniform. The degree of bending of the four sides of the glass plate will be greatly reduced, thereby effectively improving the problem of glass warping. In this way, when the glass is slow and stationary, the wind rate in both the longitudinal and transverse directions is equal. At the same time, because the glass moves laterally, the longitudinal interval cannot be in a straight line in the transverse direction. The air outlets of two adjacent wind grid bars are arranged in a staggered manner. After the glass moves, the wind rate in both the longitudinal and transverse directions is also equal.

[0032] In the present invention, the air outlets 4 on at least two wind grid bars 2 are combined to cover the entire glass plate 6 on the roller table 5 of the tempering furnace in the horizontal projection. In this way, the glass plate can be fully covered by the airflow during the transportation process, and the upper and lower surfaces of the glass can be cooled evenly and effectively. In addition, the air outlet 4 is composed of a plurality of air outlet holes 5, and the air outlet holes 5 are arranged in a staggered manner. The wind hitting the glass is more dispersed, avoiding the problem of light spots.

[0033] The cooling air outlet mechanism of the glass tempering furnace of the present invention is compared with the wind grid structure in the prior art when it is used in a specific application. Figure 8 (Table 1) and Fig. 9 (Table 2), where Table 1 is a comparison of the 3m*5m tempered furnace and nearly square glass before and after implementation; Table 2 is a comparison of the 3m*5m tempered furnace and rectangular glass mixed placement before and after implementation.

[0034] It can be seen from the above two tables that the two sizes of glass have excellent quality after the transformation of the cooling air outlet mechanism before and after the transformation. The transverse arch bend, longitudinal arch bend, transverse S-bend and longitudinal S-bend are significantly improved, the warping of the glass is smaller, and the surface of the tempered glass is flatter and smoother. In particular, for rectangular glass, the problem that long strips of glass in the tempering furnace cannot be placed horizontally and vertically is completely changed. There is no need to emphasize the placement direction, which effectively reduces the production process requirements.

[0035] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A cooling air outlet mechanism for a glass tempering furnace, comprising a plurality of wind grille packages (1) arranged vertically, the wind grille package (1) comprising a plurality of wind grille bars (2) arranged in parallel, the wind grille bars (2) being provided with air inlets (3), and a plurality of air outlets (4) being provided on a side of the wind grille bars (2) facing a roller conveyor (5) of the tempering furnace, wherein: The air outlets (4) on each wind grille strip (2) are arranged at intervals in the longitudinal direction, and the air outlets (4) on two adjacent wind grille strips (2) are arranged in a staggered manner in the longitudinal direction; The air outlet (4) is composed of a plurality of air outlet holes (7); the air outlets (4) on at least two wind grille strips (2) are combined to cover the entire glass plate (6) on the tempering furnace roller (5) in a horizontal projection.

2. The cooling air outlet mechanism of the glass tempering furnace according to claim 1, characterized in that: The air outlet holes (7) are arranged in a staggered manner.

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