Glass tempering production line capable of improving tempering quality

Abstract

The invention relates to the technical field of glass tempering equipment, and discloses a glass tempering production line capable of improving tempering quality, which comprises a quenching air cooling system, the air outlet plate is further provided with a plurality of heating grooves. The rapid cooling air cooling system is mounted on a rapid cooling air supply pipeline between a rapid cooling fan and a rapid cooling section air grid; the rapid cooling air cooling system is used for reducing the air temperature of rapid cooling air output by the rapid cooling fan to be below the room temperature; the multiple heating grooves are arranged at intervals in the width direction of the heating furnace. At least one group of heating wires are distributed in each heating groove; the bottom face of the air guide plate abuts against the top face of the peripheral groove wall of the heating groove. The plurality of air guide holes are divided into a plurality of groups, and a group of air guide holes are distributed right above each heating groove; the plurality of air outlet holes are divided into a plurality of groups, a group of air outlet holes are formed in the groove bottom of each heating groove, and the plurality of air outlet holes are uniformly distributed and penetrate through the groove bottom of the heating groove. Each heating groove forms an independent convection air heating cavity, and the air temperature of output quick cooling air can be reduced to be below the room temperature through the quick cooling air cooling system.

Description

Technical Field

[0001] The invention relates to the technical field of glass tempering equipment, and in particular to a glass tempering production line capable of improving tempering quality. Background Art

[0002] In the prior art, glass tempering is performed by heating the glass to be tempered in a heating furnace to soften the surface of the glass to be tempered, and then the heated glass to be tempered is quenched in a rapid cooling section of a cooling air grid to be tempered.

[0003] The heating furnace of the prior art outputs a circulating hot air flow to the surface of the glass to be heated through a convection heating device composed of a centrifugal fan and a heating air bag, so as to heat and soften the glass to be heated.

[0004] The multiple groups of heating wires in the existing convection heating device are all installed between the upper and lower separated air equalizing plates and the air outlet plates. Such an installation structure can make the hot air flow output by the convection heating device have relatively uniform air temperature and air pressure, but such an installation structure cannot match the air temperature of the hot air flow output by the convection heating device with the heat absorption characteristics and temperature distribution of the corresponding parts of the glass to be heated, that is, it is impossible to output a hot air flow with a low air temperature to the parts of the glass to be heated that are at a high temperature or easy to absorb heat, and output a hot air flow with a high air temperature to the parts of the glass to be heated that are at a low temperature or not easy to absorb heat.

[0005] Since the hot air flow near the inner cavity walls on both sides of the heating furnace parallel to the running direction will form turbulence, the two edges of the glass to be heated parallel to the running direction are easily heated and absorb heat, resulting in a higher temperature, which reduces the uniformity of temperature distribution on the glass surface.

[0006] The wind pressure of the quenching fan that provides quenching air for the quenching section wind grid is as high as 20000Pa, the impeller speed is fast, and the friction between the air in the quenching fan and the impeller and the inner wall is large, resulting in the wind temperature output by the quenching fan being close to 80°C, making the quenching efficiency of the glass in the quenching section low. As a result, during the quenching process, more wind spots are prone to appear on the parts of the glass surface with higher temperatures, and the glass surface in the parts with higher temperatures will flow because it is still in a softened state, resulting in fine flow marks on the glass surface, which in turn leads to poor quality of tempered glass. Summary of the invention

[0007] In view of the above-mentioned deficiencies, the purpose of the present invention is to propose a glass tempering production line that can improve the tempering quality, and to solve the problem that the convection heating device cannot output hot air flows of different temperatures separately, resulting in insufficient temperature distribution uniformity on the glass surface, and the low cooling efficiency of the rapid cooling section causes wind spots and flow marks, resulting in poor quality of the output tempered glass.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] A glass tempering production line capable of improving tempering quality, comprising a heating furnace and a cooling air grid sequentially erected on a conveyor line, a quenching fan and a plurality of convection heating devices; along a running direction, a plurality of convection heating devices are installed on the heating furnace in an intermittent arrangement, the convection heating device comprising a centrifugal fan, an air induced draft duct, a heating air bag and a plurality of heating wires, the centrifugal fan is connected to the top of the heating air bag through the air induced draft duct, a plurality of heating wires are installed in the heating air bag, the heating air bag comprises an air bag cover, an air guide plate and an air outlet plate; the air guide plate is provided with a plurality of air guide holes; the air guide holes penetrate the air guide plate; the air outlet plate is provided with a plurality of air outlet holes, the cooling air grid is divided into a quenching section air grid and a cooling section air grid; the quenching fan is installed close to the quenching section air grid, and conveys quenching air to the quenching section air grid through an air supply duct, and also comprises a quenching air cooling system; the air outlet plate is also provided with a plurality of concave heating slots;

[0010] The quenching air cooling system is installed in the quenching air supply duct between the quenching air fan and the quenching section air grille; the quenching air cooling system is used to reduce the temperature of the quenching air output by the quenching air fan to below room temperature;

[0011] The plurality of heating grooves are arranged at intervals along the width direction of the heating furnace; each of the heating grooves is provided with at least one group of the heating wires; the bottom surface of the air guide plate abuts against the top surface of the groove walls around the heating groove; the plurality of air guide holes are divided into a plurality of groups, and a group of the air guide holes is correspondingly distributed directly above each of the heating grooves, and the plurality of the air guide holes in the same group are arranged at intervals; the plurality of air outlet holes are divided into a plurality of groups, and a group of air outlet holes is correspondingly arranged at the bottom of each of the heating grooves, and the plurality of air outlet holes are evenly arranged and penetrate the bottom of the heating groove.

[0012] Furthermore, the heating air bag also includes a plurality of return air ducts;

[0013] The wind bag cover is provided with a plurality of upper return air duct mounting holes, and the air outlet plate is also provided with a plurality of lower return air duct mounting holes;

[0014] The plurality of upper return air duct mounting holes are divided into a plurality of groups, and the plurality of lower return air duct mounting holes are divided into a plurality of groups; the plurality of upper return air duct mounting holes in the same group and the plurality of lower return air duct mounting holes in the same group correspond to each other one by one, and are respectively arranged between two adjacent heating tanks at intervals;

[0015] The return air duct is hollow; the outer peripheral surface of the lower end of the return air duct is connected to the hole wall of the lower return air duct mounting hole; the upper end of the return air duct passes through the corresponding upper return air duct mounting hole, the upper end of the return air duct is exposed on the top surface of the air bag cover, and the outer peripheral surface of the upper end of the return air duct is connected to the hole wall of the upper return air duct mounting hole.

[0016] Preferably, the air guide hole is a long strip-shaped through hole, and the length extension direction of the air guide hole is the same as the length extension direction of the heating slot;

[0017] The extension direction of the heating groove is arranged to be biased relative to the running direction of the glass;

[0018] The angle between the extension direction of the heating groove and the running direction of the glass is 5-10°.

[0019] Preferably, a plurality of the heating wires are arranged in the heating tank, and the spirally wound heating wires extend along the length direction of the heating tank;

[0020] The multiple air guide holes in the same group are divided into multiple columns, and the multiple air guide holes in the same column are arranged in a straight line at intervals along the extension direction of the heating wire. The multiple columns of air guide holes are opposite to the multiple heating wires one by one up and down.

[0021] Preferably, along the direction of glass movement, one end of the heating groove extends outside the wind cover and is exposed;

[0022] A power cord insertion hole is provided on the plate surface of the air guide plate located above the exposed heating slot, and the power cord insertion hole is used to install a power cord electrically connected to the corresponding heating wire.

[0023] Specifically, the quench air cooling system includes a heat exchange wind box, a primary heat exchanger and a secondary heat exchanger;

[0024] The input port of the heat exchange wind box is connected to the output port of the quenching fan, and the output port of the heat exchange wind box is connected to the quenching air input port of the cooling air grille of the quenching section air grille;

[0025] The primary heat exchanger and the secondary heat exchanger are respectively installed in the heat exchange wind box, the primary heat exchanger is close to the input port of the heat exchange wind box, and the secondary heat exchanger is close to the output port of the heat exchange wind box; the temperature of the refrigerant circulating in the secondary heat exchanger is lower than the room temperature and lower than the temperature of the cooling water circulating in the primary heat exchanger;

[0026] The primary heat exchanger and the secondary heat exchanger are respectively used to exchange heat with the quenching air input into the heat exchange wind box.

[0027] Furthermore, the quench air cooling system also includes a cooling water tower and a screw chiller;

[0028] The cooling water inlet of the primary heat exchanger is connected to the cooling water outlet of the cooling water tower through a pipeline, and the cooling water outlet of the primary heat exchanger is connected to the cooling water inlet of the cooling water tower through a pipeline;

[0029] The refrigerant input port of the secondary heat exchanger is connected to the refrigerant output port of the screw chiller through a pipeline, and the refrigerant output port of the secondary heat exchanger is connected to the refrigerant input port of the screw chiller through a pipeline.

[0030] Furthermore, the quench air cooling system also includes a circulation pump;

[0031] The pipeline connecting the refrigerant outlet of the secondary heat exchanger and the refrigerant inlet of the screw chiller, and the pipeline connecting the cooling water outlet of the primary heat exchanger and the cooling water inlet of the cooling water tower are both equipped with circulation pumps.

[0032] Furthermore, the quench air cooling system also includes an insulation tank;

[0033] The refrigerant outlet of the secondary heat exchanger is connected to the refrigerant inlet of the insulation tank through a pipeline, and the refrigerant outlet of the insulation tank is connected to the refrigerant inlet of the screw chiller through a pipeline;

[0034] The screw chiller is provided with a screw cooling chamber;

[0035] The cooling water inlet of the screw cooling chamber is connected to the cooling water outlet of the cooling water tower through a pipeline, and the cooling water outlet of the screw cooling chamber is connected to the cooling water inlet of the cooling water tower located at the top of the tower through a pipeline.

[0036] Preferably, the refrigerant outlet of the screw chiller is respectively connected to the refrigerant inlet of the insulation tank and the refrigerant inlet of the secondary heat exchanger through two pipes.

[0037] The technical solution of a glass tempering production line for improving tempering quality proposed by the present invention has the following beneficial effects: each heating slot in the convection heating device forms an independent convection air heating chamber, and the input current and input voltage of the heating wire in the corresponding heating slot can be adjusted so that the temperature of the hot air flow output by each heating slot matches the heat absorption characteristics and temperature distribution of the corresponding part of the glass to be heated, thereby improving the temperature distribution uniformity of the glass surface during the heating process; and the wind temperature of the quenching air output by the quenching air fan can be reduced to below room temperature through the quenching air cooling system, which can improve the cooling efficiency of the glass in the quenching section, thereby reducing the generation of wind spots and flow marks on the glass surface, thereby improving the quality of tempered glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the installation structure of an embodiment of a glass tempering production line capable of improving tempering quality of the present invention;

[0039] Figure 2It is a cross-sectional structural schematic diagram of an embodiment of a convection heating device for a glass tempering production line capable of improving tempering quality according to the present invention;

[0040] Figure 3 for Figure 2 An enlarged view of part A;

[0041] Figure 4 It is a schematic diagram of the structure of the heating air bag;

[0042] Figure 5 for Figure 4 A schematic diagram of the structure of the air outlet plate when viewed from above;

[0043] Figure 6 for Figure 4 An enlarged view of part B;

[0044] Figure 7 It is a structural schematic diagram of an embodiment of a heat exchange wind box of the present invention;

[0045] Figure 8 A schematic diagram of the circulation flow path of cooling water and refrigerant in the quenching air cooling system of the present invention;

[0046] Wherein: heating furnace 1; convection heating device 2; cooling air grid 3; rapid cooling fan 4; rapid cooling air cooling system 5; conveying line 6;

[0047] Centrifugal fan 21; air duct 22; heating air bag 23; multiple groups of heating wires 24; rapid cooling section air grille 31; cooling section air grille 32;

[0048] Heat exchange bellows 51; primary heat exchanger 52; secondary heat exchanger 53; cooling water tower 54; screw chiller 55; insulation tank 56; circulation pump 57;

[0049] Air inlet 210; heating tank 230; wind bag cover 231; air guide plate 232; air outlet plate 233; return air duct 234; air inlet hole 2310; upper return air duct mounting hole 2311; air guide hole 2321; air outlet hole 2331; lower return air duct mounting hole 2332; connecting hole 23121. DETAILED DESCRIPTION

[0050] The following is combined with Figure 1-8 The technical solution of the present invention is further illustrated by specific implementation methods.

[0051] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, which can be said to be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] A glass tempering production line capable of improving tempering quality comprises a heating furnace 1 and a cooling air grid 3, a quenching fan 4 and a plurality of convection heating devices 2 which are sequentially erected on a conveyor line 6; along a running direction, the plurality of convection heating devices 2 are installed on the heating furnace 1 in an intermittent arrangement, the convection heating devices 2 comprising a centrifugal fan 21, an air duct 22, a heating air bag 23 and a plurality of heating wires 24, the centrifugal fan 21 is connected to the top of the heating air bag 23 through the air duct 22, the heating air bag 23 is equipped with a plurality of heating wires 24, the heating air bag 23 comprises a fan The cover 231, the air guide plate 232 and the air outlet plate 233; the air guide plate 232 is provided with a plurality of air guide holes 2321; the air guide holes 2321 penetrate the air guide plate 232; the air outlet plate 233 is provided with a plurality of air outlet holes 2331, the cooling air grille 3 is divided into a quenching section air grille 31 and a cooling section air grille 32; the quenching fan 4 is installed close to the quenching section air grille 31, and delivers quenching air to the quenching section air grille 31 through the air supply duct, and also includes a quenching air cooling system 5; the air outlet plate 233 is also provided with a plurality of concave heating slots 230;

[0054] The quenching air cooling system 5 is installed in the quenching air supply duct between the quenching air fan 4 and the quenching section air grille 31; the quenching air cooling system 5 is used to reduce the temperature of the quenching air output by the quenching air fan 4 to below the room temperature;

[0055] The plurality of heating slots 230 are arranged at intervals along the width direction of the heating furnace 1; each of the heating slots 230 is provided with at least one group of the heating wires 24; the bottom surface of the air guide plate 232 is against the top surface of the slot walls around the heating slot 230; the plurality of air guide holes 2321 are divided into a plurality of groups, and a group of the air guide holes 2321 is correspondingly distributed directly above each of the heating slots 230, and the plurality of the air guide holes 2321 in the same group are arranged at intervals; the plurality of the air outlet holes 2331 are divided into a plurality of groups, and a group of the air outlet holes 2331 is correspondingly arranged at the bottom of each of the heating slots 230, and the plurality of the air outlet holes 2331 are evenly arranged and penetrate the bottom of the heating slot 230.

[0056] Figure 1The schematic diagram of the installation structure of an embodiment of a glass tempering production line capable of improving tempering quality of the present invention is shown in the figure. The cooling fan 7 is installed close to the cooling section air grille 32 and delivers cooling air to the cooling section air grille 32 through the air supply duct. Figure 2 It is a structural schematic diagram of an embodiment of a convection heating device 2 of the present invention; Figure 3 for Figure 2 An enlarged view of part A; Figure 4 is a schematic diagram of the structure of the heating air bag 23, Figure 4 The top of the wind bag cover 231 is provided with an air inlet hole 2310, and the output end of the air duct 22 inputs the air to be heated to the heating wind bag 23 through the air inlet hole 2310. The front in the figure is the running direction of the glass; Figure 5 for Figure 4 A schematic structural diagram of the air outlet plate 233 when viewed from above.

[0057] It should be noted that the wind pressure of the quenching fan 4 that provides quenching air for the quenching section wind grid 31 is as high as 20000Pa, the impeller speed is fast, and the friction between the air in the quenching fan 4 and the impeller and the inner wall is large, resulting in the wind temperature output by the quenching fan 4 being close to 80°C.

[0058] In a glass tempering production line of the present invention, at least one group of heating wires are arranged in each heating tank 230, a group of air outlet holes 2331 are arranged on the bottom of the heating tank 230, and an air guide plate 232 covering the tank walls around the heating tank 230 is provided with a group of air guide holes 2321 just above the heating tank 230, so that each heating tank 230 forms an independent convection air heating chamber, and the input current and input voltage of the heating wire 24 in the corresponding heating tank 230 can be adjusted to make each heating tank 230 output the required hot air flow temperature, thereby avoiding the phenomenon of low temperature distribution uniformity on the glass surface in the heating furnace 1; and the quenching air output by the quenching fan 4 can be lowered to below room temperature by the quenching air cooling system 5, so as to improve the quenching efficiency of the glass in the quenching section, so as to avoid the occurrence of wind spots and flow marks caused thereby, thereby improving the overall quality of glass tempering.

[0059] Furthermore, the heating air bag 23 also includes a plurality of return air ducts 234;

[0060] The wind bag cover 231 is provided with a plurality of upper return air duct mounting holes 2311, and the air outlet plate 233 is further provided with a plurality of lower return air duct mounting holes 2332;

[0061] The plurality of upper return air duct mounting holes 2311 are divided into a plurality of groups, and the plurality of lower return air duct mounting holes 2332 are divided into a plurality of groups; the plurality of upper return air duct mounting holes 2311 in the same group and the plurality of lower return air duct mounting holes 2332 in the same group correspond to each other one by one, and are arranged between two adjacent heating slots 230 at intervals;

[0062] The return air duct 234 is hollow; the outer peripheral surface of the lower end portion of the return air duct 234 is connected to the hole wall of the lower return air duct mounting hole 2332; the upper end of the return air duct 234 passes through the corresponding upper return air duct mounting hole 2311, and the upper end portion of the return air duct 234 is exposed on the top surface of the wind bag cover 231, and the outer peripheral surface of the upper end of the return air duct 234 is connected to the hole wall of the upper return air duct mounting hole 2311.

[0063] like Figure 2 As shown, the air inlet 210 of the centrifugal fan 21 is downwardly aligned with the middle of the top surface of the heating air bag 23, and the centrifugal fan 21 continuously transports the air input from the air inlet 210 to the top of the heating air bag 23 through the air duct 22, and forms a circulating hot air flow.

[0064] like Figure 2-5 As shown, the hot air flow output through multiple air outlets 2331 is blown downward to the surface of the glass to be heated. After the hot air flow contacts the surface of the glass to be heated, it rebounds upward. Under the attraction of the air inlet 210 of the centrifugal fan 21, the rebounded hot air flow flows back to the top surface of the heating air bag 23 through multiple return air ducts 234.

[0065] Compared with the prior art technical solution of performing hot air flow recirculation through the four sides of the heating air bag 23, the hot air flow recirculation speed of the present invention using multiple return air ducts 234 is fast and efficient, which is beneficial to improving the heating efficiency of the convection heating device 2.

[0066] Preferably, the air guide hole 2321 is a long strip-shaped through hole, and the length extension direction of the air guide hole 2321 is the same as the length extension direction of the heating slot 230;

[0067] The extension direction of the heating groove 230 is set to be biased relative to the running direction of the glass;

[0068] The angle between the extension direction of the heating groove 230 and the running direction of the glass is 5-10°.

[0069] like Figure 4 and Figure 6 As shown, the air guide hole 2321 which is a long strip through hole has smaller wind resistance, which can reduce the velocity loss of the airflow passing through the air guide plate 232 and entering the heating groove 230, and is helpful to improve the heating efficiency of the convection heating device 2 for the heated glass.

[0070] like Figure 5In the embodiment shown, since there is a gap between two adjacent heating grooves 230 and no air outlet 2331 is provided in the gap, if the extension direction of the heating groove 230 is parallel to the running direction of the glass, it will result in a lack of hot air flow blowing relative to the surface portion of the glass to be heated between the two heating grooves 230.

[0071] The extension direction of the heating groove 230 is set at an angle of 5-10° relative to the running direction of the glass, which can overcome the defect of lack of hot air flow blowing on the surface of the heated glass.

[0072] Specifically, a plurality of the heating wires 24 are arranged in the heating groove 230 , and the spirally wound heating wires 24 extend along the length direction of the heating groove 230 ;

[0073] The multiple air guide holes 2321 in the same group are divided into multiple columns. The multiple air guide holes 2321 in the same column are arranged in a straight line along the extension direction of the heating wire 24 . The multiple columns of air guide holes 2321 are opposite to the multiple heating wires 24 one by one.

[0074] like Figure 3 , Figure 4 and Figure 6 As shown, the arrangement of the air guide holes 2321 and the heating wire 24 that are opposite to each other up and down can improve the heat exchange efficiency between the airflow passing through the air guide holes 2321 and entering the heating slot 230 and the corresponding heating wire 24 .

[0075] In addition, the far infrared rays emitted by the heating wire 24 can also be radiated through the air guide hole 2321 which is a long strip of through hole and enter the space between the air guide plate 232 and the wind bag cover 231, so that the airflow can be preheated by the far infrared rays emitted by the heating wire 24 before entering the air guide hole 2321, which can further improve the heating efficiency of the convection heating device 2.

[0076] In addition, the airflow passing through the air guide hole 2321 and entering the heating groove 230 contacts the corresponding heating wire 24, and the airflow is broken up and diffused in all directions. There will be no phenomenon in which the airflow directly passes through the air outlet hole 2331 aligned below from the air guide hole 232 and blows onto the surface of the glass to be heated, which is beneficial to reducing wind spots on the surface of the glass to be heated.

[0077] Preferably, along the direction of glass movement, one end of the heating groove 230 extends outside the wind cover 231 and is exposed;

[0078] A power cord insertion hole is provided on the plate surface of the air guide plate 232 located above the exposed heating slot 230 , and the power cord insertion hole is used to install a power cord electrically connected to the corresponding heating wire 24 .

[0079] like Figure 4As shown, the setting of the exposed wind bag cover 231 at one end of the heating groove 230 can improve the installation convenience of the power cord of the heating wire 24, avoid opening a corresponding power cord installation hole in the wind bag cover 231, and simplify the internal structure of the heating wind bag 23.

[0080] like Figure 2 and Figure 6 In the embodiment shown, the wind bag cover 231 is divided into two covers along the direction perpendicular to the running direction of the glass;

[0081] One end of the two covers of the wind bag cover 231 is connected by a connecting plate 2312; an air inlet hole 2310 is provided in the middle of the cover, the output port of the air duct 22 is connected to the air inlet hole 231, and the input port of the air duct 22 is connected to the output port of the centrifugal fan 21;

[0082] The connecting plate 2312 is provided with a connecting hole 23121 , and the inner cavities of the two air bag covers 231 are connected via the connecting hole 23121 .

[0083] The centrifugal fan 21 inputs air into the two covers of the air bag cover 231 from the left and right sides respectively through the air duct 22, and the two covers of the ventilation bag cover 231 are connected by a connecting plate 2312 with a connecting hole 23121, so that the wind pressure in the two covers can be kept balanced.

[0084] Specifically, the quench air cooling system 5 includes a heat exchange wind box 51, a primary heat exchanger 52 and a secondary heat exchanger 53;

[0085] The input port of the heat exchange wind box 51 is connected to the output port of the quenching fan 4, and the output port of the heat exchange wind box 51 is connected to the quenching air input port of the cooling air grid 3 of the quenching section air grid 31;

[0086] The primary heat exchanger 52 and the secondary heat exchanger 53 are respectively installed in the heat exchange wind box 51, the primary heat exchanger 52 is close to the input port of the heat exchange wind box 51, and the secondary heat exchanger 53 is close to the output port of the heat exchange wind box 51; the temperature of the refrigerant circulating in the secondary heat exchanger 53 is lower than the room temperature and lower than the temperature of the cooling water circulating in the primary heat exchanger 52;

[0087] The primary heat exchanger 52 and the secondary heat exchanger 53 are respectively used to exchange heat with the quenching air input into the heat exchange wind box 51 .

[0088] Figure 7 FIG. 5 is a schematic structural diagram of an embodiment of a heat exchange wind box 51 in the quenching air cooling system 5 of the present invention. Figure 7 The dotted arrow in the figure indicates the direction in which the quenching air enters the heat exchange wind box 51 .

[0089] The quenching air cooling system 5 of the present invention adopts a heat exchange bellows 51 in which a primary heat exchanger 52 and a secondary heat exchanger 53 are installed. The circulating cooling water in the primary heat exchanger 52 and the refrigerant circulating in the secondary heat exchanger 53 can exchange heat with the quenching air input into the heat exchange bellows 51, so that the temperature of the quenching air output by the heat exchange bellows 51 is lower than the room temperature.

[0090] Furthermore, the quench air cooling system 5 also includes a cooling water tower 54 and a screw chiller 55;

[0091] The cooling water inlet of the primary heat exchanger 52 is connected to the cooling water outlet of the cooling water tower 54 through a pipeline, and the cooling water outlet of the primary heat exchanger 52 is connected to the cooling water inlet of the cooling water tower 54 through a pipeline;

[0092] The refrigerant input port of the secondary heat exchanger 53 is connected to the refrigerant output port of the screw chiller 55 through a pipeline, and the refrigerant output port of the secondary heat exchanger 53 is connected to the refrigerant input port of the screw chiller 55 through a pipeline.

[0093] Figure 8 The present invention is a schematic diagram of the circulation flow path of cooling water and refrigerant in a rapid cooling air cooling system for glass tempering.

[0094] like Figure 8 As shown, when the room temperature is not higher than 30°C, the temperature of the cooling water circulated and cooled by the cooling water tower 54 and outputted is lower than 30°C, and the quenching wind outputted by the heat exchange bellows 51 can be cooled to below 30°C by the primary heat exchanger 52, and the quenching wind with a temperature lower than 30°C is delivered to the quenching section of the wind grid, so that the quenching section of the wind grid has good quenching efficiency, which can shorten the cooling time of the tempered glass in the quenching section and improve the production efficiency of glass tempering.

[0095] When the room temperature exceeds 30°C, the cooling efficiency of the cooling tower 54 decreases, and the temperature of the cooling water circulated through the cooling tower 54 is not lower than 30°C. At this time, only the primary heat exchanger 52 cannot cool the rapid cooling air output by the heat exchange bellows 51 to below 30°C.

[0096] like Figure 8 As shown, the temperature of the refrigerant circulated and output by the screw chiller 55 is not higher than 15°C. When the temperature of the cooling water circulated and cooled through the cooling water tower 54 is higher than 30°C, the screw chiller 55 and the heat exchanger 3 can be used to perform a second heat exchange on the quenching air input into the heat exchange bellows 51, so that the temperature of the quenching air output from the heat exchange bellows 51 is reduced to below the temperature threshold (such as 25°C) set by the process control requirements, thereby ensuring the quenching efficiency of the glass tempering.

[0097] Furthermore, the quench air cooling system 5 also includes a circulation pump 57;

[0098] The pipeline connecting the refrigerant outlet of the secondary heat exchanger 53 and the refrigerant inlet of the screw chiller 55 , and the pipeline connecting the cooling water outlet of the primary heat exchanger 52 and the cooling water inlet of the cooling water tower 54 are both installed with a circulation pump 57 .

[0099] like Figure 8 As shown, the flow rate and pressure of the refrigerant or cooling water transported in the corresponding pipelines can be controlled by the circulation pump 57.

[0100] In a preferred embodiment, two circulating pumps 57 may be installed in parallel in each refrigerant circulation pipeline or cooling water circulation pipeline, and one of the circulating pumps 57 is a standby one.

[0101] Furthermore, the quench air cooling system 5 also includes a heat preservation tank 56;

[0102] The refrigerant outlet of the secondary heat exchanger 53 is connected to the refrigerant inlet of the insulation tank 56 through a pipeline, and the refrigerant outlet of the insulation tank 56 is connected to the refrigerant inlet of the screw chiller 55 through a pipeline;

[0103] The screw chiller 55 is provided with a screw cooling chamber;

[0104] The cooling water inlet of the screw cooling chamber is connected to the cooling water outlet of the cooling water tower 54 through a pipeline, and the cooling water outlet of the screw cooling chamber is connected to the cooling water inlet of the cooling water tower 54 located at the top of the tower through a pipeline.

[0105] like Figure 8 As shown, more refrigerants with a temperature below 15°C can be stored in the insulation tank 56, so that after the screw chiller 55 is turned on, the secondary heat exchanger 53 can immediately exert a rapid cooling effect, so that the temperature of the quenching air output by the heat exchange bellows 51 can be continuously maintained below the set temperature threshold.

[0106] The cooling water of the cooling tower 54 can also be input into the screw cooling chamber to cool the screw in the screw chiller 55 to prevent the screw in the screw chiller 55 from being damaged due to excessive temperature, thereby improving the operating stability and service life of the screw chiller 55.

[0107] Preferably, the refrigerant outlet of the screw chiller 55 is connected to the refrigerant inlet of the insulation tank 56 and the refrigerant inlet of the secondary heat exchanger 53 through two pipes respectively.

[0108] like Figure 8As shown, the screw chiller 55 has a high cooling efficiency. When the temperature of the refrigerant output by the screw chiller 55 is lower than 10°C, the temperature of the cooling air passing through the secondary heat exchanger 53 and the heat exchange bellows 51 will be significantly lower than the temperature threshold set according to the process control requirements, resulting in improper use of the refrigerant and waste. At this time, the refrigerant flow rate of the screw chiller 55 input into the secondary heat exchanger 53 can be reduced, and at the same time, the remaining flow of refrigerant can be input into the insulation tank 56 through a pipe connected to the refrigerant input port of the insulation tank 56, so as to improve the utilization rate of the refrigerant.

[0109] In summary, if Figure 1-8 In the embodiment of the present invention shown, the glass tempering production line capable of improving the tempering quality, each heating slot 230 in the convection heating device 2 forms an independent convection air heating chamber, and the input current and input voltage of the heating wire 24 in the corresponding heating slot 230 can be adjusted so that the temperature of the hot air flow output by each heating slot 230 matches the heat absorption characteristics and temperature distribution of the corresponding part of the glass to be heated, thereby improving the temperature distribution uniformity of the glass surface during the heating process; and the wind temperature of the quenching air output by the quenching air fan 4 can be reduced to below room temperature through the quenching air cooling system 5, which can improve the cooling efficiency of the glass in the quenching section, thereby reducing the generation of wind spots and flow marks on the glass surface, and improving the quality of the tempered glass.

[0110] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A glass tempering production line capable of improving tempering quality, comprising a heating furnace and a cooling air grid sequentially erected on a conveyor line, a quenching fan and a plurality of convection heating devices; along the running direction, the plurality of convection heating devices are installed on the heating furnace in an intermittent manner, the convection heating device comprises a centrifugal fan, an air duct, a heating air bag and a plurality of heating wires, the centrifugal fan is connected to the top of the heating air bag through the air duct, a plurality of heating wires are installed in the heating air bag, the heating air bag comprises an air bag cover, an air guide plate and an air outlet plate; the air guide plate is provided with a plurality of air guide holes; the air guide holes penetrate the air guide plate; the air outlet plate is provided with a plurality of air outlet holes, the cooling air grid is divided into a quenching section air grid and a cooling section air grid; the quenching fan is installed close to the quenching section air grid, and delivers quenching air to the quenching section air grid through an air supply duct, characterized in that: It also includes a rapid cooling air cooling system; the air outlet plate is also provided with a plurality of concave heating slots; The quenching air cooling system is installed in the quenching air supply duct between the quenching air fan and the quenching section air grille; the quenching air cooling system is used to reduce the temperature of the quenching air output by the quenching air fan to below room temperature; The plurality of heating slots are arranged at intervals along the width direction of the heating furnace; each of the heating slots is provided with at least one group of heating wires; the bottom surface of the air guide plate abuts against the top surface of the slot walls around the heating slot; the plurality of air guide holes are divided into a plurality of groups, and a group of air guide holes is correspondingly distributed directly above each of the heating slots, and the plurality of air guide holes in the same group are arranged at intervals; The plurality of air outlet holes are divided into a plurality of groups, and a group of air outlet holes is arranged corresponding to the bottom of each heating slot, and the plurality of air outlet holes are evenly arranged and penetrate the bottom of the heating slot.

2. The glass tempering production line capable of improving tempering quality according to claim 1, characterized in that: The heating air bag also includes a plurality of return air ducts; The wind bag cover is provided with a plurality of upper return air duct mounting holes, and the air outlet plate is also provided with a plurality of lower return air duct mounting holes; The plurality of upper return air duct mounting holes are divided into a plurality of groups, and the plurality of lower return air duct mounting holes are divided into a plurality of groups; the plurality of upper return air duct mounting holes in the same group and the plurality of lower return air duct mounting holes in the same group correspond to each other one by one, and are respectively arranged between two adjacent heating tanks at intervals; The return air duct is hollow; the outer peripheral surface of the lower end of the return air duct is connected to the hole wall of the lower return air duct mounting hole; the upper end of the return air duct passes through the corresponding upper return air duct mounting hole, the upper end of the return air duct is exposed on the top surface of the air bag cover, and the outer peripheral surface of the upper end of the return air duct is connected to the hole wall of the upper return air duct mounting hole.

3. The glass tempering production line capable of improving tempering quality according to claim 1, characterized in that: The air guide hole is a long strip-shaped through hole, and the length extension direction of the air guide hole is the same as the length extension direction of the heating tank; The extension direction of the heating groove is arranged to be biased relative to the running direction of the glass; The angle between the extension direction of the heating groove and the running direction of the glass is 5-10°.

4. The glass tempering production line capable of improving tempering quality according to claim 3, characterized in that: A plurality of heating wires are arranged in the heating tank, and the spirally wound heating wires extend along the length direction of the heating tank; The multiple air guide holes in the same group are divided into multiple columns, and the multiple air guide holes in the same column are arranged in a straight line at intervals along the extension direction of the heating wire. The multiple columns of air guide holes are opposite to the multiple heating wires one by one up and down.

5. The glass tempering production line capable of improving tempering quality according to claim 1, characterized in that: Along the running direction of the glass, one end of the heating groove extends out of the wind cover and is exposed; A power cord insertion hole is provided on the plate surface of the air guide plate located above the exposed heating slot, and the power cord insertion hole is used to install a power cord electrically connected to the corresponding heating wire.

6. The glass tempering production line capable of improving tempering quality according to claim 1, characterized in that: The quench air cooling system includes a heat exchange bellows, a primary heat exchanger and a secondary heat exchanger; The input port of the heat exchange wind box is connected to the output port of the quenching fan, and the output port of the heat exchange wind box is connected to the quenching air input port of the cooling air grille of the quenching section air grille; The primary heat exchanger and the secondary heat exchanger are respectively installed in the heat exchange wind box, the primary heat exchanger is close to the input port of the heat exchange wind box, and the secondary heat exchanger is close to the output port of the heat exchange wind box; the temperature of the refrigerant circulating in the secondary heat exchanger is lower than the room temperature and lower than the temperature of the cooling water circulating in the primary heat exchanger; The primary heat exchanger and the secondary heat exchanger are respectively used to exchange heat with the quenching air input into the heat exchange wind box.

7. The glass tempering production line capable of improving tempering quality according to claim 6, characterized in that: The quench air cooling system also includes a cooling water tower and a screw chiller; The cooling water inlet of the primary heat exchanger is connected to the cooling water outlet of the cooling water tower through a pipeline, and the cooling water outlet of the primary heat exchanger is connected to the cooling water inlet of the cooling water tower through a pipeline; The refrigerant input port of the secondary heat exchanger is connected to the refrigerant output port of the screw chiller through a pipeline, and the refrigerant output port of the secondary heat exchanger is connected to the refrigerant input port of the screw chiller through a pipeline.

8. The glass tempering production line capable of improving tempering quality according to claim 7, characterized in that: The quench air cooling system also includes a circulation pump; The pipeline connecting the refrigerant outlet of the secondary heat exchanger and the refrigerant inlet of the screw chiller, and the pipeline connecting the cooling water outlet of the primary heat exchanger and the cooling water inlet of the cooling water tower are both equipped with circulation pumps.

9. The glass tempering production line capable of improving tempering quality according to claim 7, characterized in that: The quench air cooling system also includes a heat preservation tank; The refrigerant outlet of the secondary heat exchanger is connected to the refrigerant inlet of the insulation tank through a pipeline, and the refrigerant outlet of the insulation tank is connected to the refrigerant inlet of the screw chiller through a pipeline; The screw chiller is provided with a screw cooling chamber; The cooling water inlet of the screw cooling chamber is connected to the cooling water outlet of the cooling water tower through a pipeline, and the cooling water outlet of the screw cooling chamber is connected to the cooling water inlet of the cooling water tower located at the top of the tower through a pipeline.

10. The glass tempering production line capable of improving tempering quality according to claim 9, characterized in that: The refrigerant outlet of the screw chiller is respectively connected to the refrigerant inlet of the insulation tank and the refrigerant inlet of the secondary heat exchanger through two pipelines.

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