A glass tempering production line that can improve tempering quality

Abstract

This invention relates to the field of glass tempering equipment technology, and discloses a glass tempering production line that can improve tempering quality. It further includes a rapid cooling system; the air outlet plate is also provided with multiple heating slots; the rapid cooling system is installed in the rapid cooling air supply duct between the rapid cooling fan and the rapid cooling section air grid; the rapid cooling system is used to reduce the temperature of the rapid cooling air output by the rapid cooling fan to below room temperature; multiple heating slots are arranged at intervals along the width of the heating furnace; each heating slot is provided with at least one set of heating wires; the bottom surface of the air guide plate abuts against the top surface of the surrounding walls of the heating slot; multiple air guide holes are divided into multiple groups, with one group of air guide holes distributed directly above each heating slot; multiple air outlet holes are divided into multiple groups, with one group of air outlet holes arranged at the bottom of each heating slot, and the multiple air outlet holes are evenly arranged and penetrate the bottom of the heating slot. Each heating slot forms an independent convection heating chamber, and the rapid cooling system can reduce the temperature of the output rapid cooling air to below room temperature.

Description

Technical Field

[0001] This invention relates to the field of glass tempering equipment technology, and in particular to a glass tempering production line that can improve the quality of tempering. Background Technology

[0002] In existing glass tempering technology, the glass to be tempered is heated in a furnace to soften its surface, and then the heated glass is quenched and tempered by passing it through a rapid cooling section of a cooling fan.

[0003] Existing heating furnaces use a convection heating device consisting of a centrifugal fan and a heating air receiver to output a circulating hot airflow to the surface of the glass to be heated, thereby heating and softening the glass.

[0004] In existing convection heating devices, multiple heating wires are installed between upper and lower spaced air distribution plates and air outlet plates. This installation structure can make the hot air output by the convection heating device have a relatively uniform air temperature and air pressure. However, this installation structure cannot match the air temperature of the hot air output by the convection heating device with the heat absorption characteristics and temperature distribution of the corresponding part of the glass to be heated. That is, it cannot output a low-temperature hot air to the part of the glass to be heated that has a high temperature or is easy to absorb heat, while it can output a high-temperature hot air to the part of the glass to be heated that has a low temperature or is not easy to absorb heat.

[0005] Because the hot airflow near the inner walls of the heating furnace on both sides parallel to the direction of operation will form turbulence, the two edges of the glass to be heated parallel to the direction of operation are easily heated and absorb heat, resulting in a higher temperature and reducing the uniformity of temperature distribution on the glass surface.

[0006] The quenching fan that supplies quenching air to the quenching section's air grid has a wind pressure as high as 20,000 Pa and a high impeller speed. The friction between the air inside the quenching fan and the impeller and inner wall is high, resulting in the quenching fan outputting air temperature close to 80°C. This leads to low quenching efficiency of the glass in the quenching section. As a result, during the quenching process, more wind spots are likely to appear on the glass surface where the temperature is higher. Furthermore, the glass surface in the higher temperature areas is still in a softened state and will exhibit flow phenomena, resulting in fine flow marks on the glass surface. Consequently, the quality of glass tempering is poor. Summary of the Invention

[0007] To address the aforementioned shortcomings, the present invention aims to propose a glass tempering production line that can improve tempering quality. This solves the problems of insufficient temperature distribution uniformity on the glass surface due to the inability of the convection heating device to output hot airflows of different temperatures, and the low cooling efficiency of the quenching section leading to wind spots and flow marks, resulting in poor tempered glass quality.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] A glass tempering production line for improving tempering quality includes a heating furnace and a cooling air grid sequentially arranged on a conveyor line, as well as a quenching fan and multiple convection heating devices. Along the operating direction, multiple convection heating devices are spaced apart and installed in the heating furnace. Each convection heating device includes a centrifugal fan, an exhaust duct, a heating air chamber, and multiple sets of heating wires. The centrifugal fan is connected to the top of the heating air chamber through the exhaust duct. Multiple sets of heating wires are installed inside the heating air chamber, which includes an air chamber cover, a guide plate, and an outlet plate. The guide plate has multiple guide holes that penetrate through it. The outlet plate has multiple 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 it through an air supply duct. The production line also includes a quenching air cooling system. The outlet plate also has multiple recessed heating grooves.

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

[0011] Multiple heating tanks are arranged at intervals along the width of the heating furnace; each heating tank is provided with at least one set of heating wires; the bottom surface of the air guide plate abuts against the top surface of the surrounding walls of the heating tank; multiple air guide holes are divided into multiple groups, with one set of air guide holes correspondingly distributed above each heating tank, and multiple air guide holes in the same group are arranged at intervals; multiple air outlet holes are divided into multiple groups, with one set of air outlet holes correspondingly arranged at the bottom of each heating tank, and multiple air outlet holes are evenly arranged and penetrate the bottom of the heating tank.

[0012] Furthermore, the heating air receiver also includes multiple return air ducts;

[0013] The air cover has multiple upper return air duct mounting holes, and the air outlet plate also has multiple lower return air duct mounting holes;

[0014] The multiple upper return air duct mounting holes are divided into multiple groups, and the multiple lower return air duct mounting holes are divided into multiple groups; the multiple upper return air duct mounting holes in the same group and the multiple lower return air duct mounting holes in the same group correspond one-to-one and are arranged at intervals between two adjacent heating tanks;

[0015] The return air duct is hollow; the outer peripheral surface of the lower end of the return air duct is connected to the 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 envelope, and the outer peripheral surface of the upper end of the return air duct is connected to the wall of the upper return air duct mounting hole.

[0016] Preferably, the air guide hole is an elongated through hole, and the length extension direction of the air guide hole is the same as the length extension direction of the heating tank;

[0017] The extension direction of the heating tank is offset relative to the running direction of the glass;

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

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

[0020] The multiple air guide holes in the same group are divided into multiple rows. The multiple air guide holes in the same row are arranged in a straight line at intervals along the extension direction of the heating wire. The multiple rows of air guide holes and the multiple heating wires are one above the other.

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

[0022] The air guide plate located above the exposed heating tank has a power cord insertion hole on its surface, which is used to install a power cord that is electrically connected to the corresponding heating wire.

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

[0024] The inlet of the heat exchange air box is connected to the outlet of the quench fan, and the outlet of the heat exchange air box is connected to the quench air inlet of the cooling air grid of the quench section air grid.

[0025] The primary heat exchanger and the secondary heat exchanger are respectively installed inside the heat exchange air box. The primary heat exchanger is close to the inlet of the heat exchange air box, and the secondary heat exchanger is close to the outlet of the heat exchange air 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 box.

[0027] Furthermore, the rapid cooling system also includes a cooling 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 via a pipe, and the cooling water outlet of the primary heat exchanger is connected to the cooling water inlet of the cooling water tower via a pipe.

[0029] The refrigerant inlet of the secondary heat exchanger is connected to the refrigerant outlet of the screw chiller via a pipe, and the refrigerant outlet of the secondary heat exchanger is connected to the refrigerant inlet of the screw chiller via a pipe.

[0030] Furthermore, the rapid cooling system also includes a circulating pump;

[0031] The pipes connecting the refrigerant outlet of the secondary heat exchanger and the refrigerant inlet of the screw chiller, as well as the pipes connecting the cooling water outlet of the primary heat exchanger and the cooling water inlet of the cooling tower, are all equipped with circulating pumps.

[0032] Furthermore, the rapid cooling system also includes an insulated tank;

[0033] The refrigerant outlet of the secondary heat exchanger is connected to the refrigerant inlet of the insulation tank via a pipe, and the refrigerant outlet of the insulation tank is connected to the refrigerant inlet of the screw chiller via a pipe.

[0034] The screw chiller is equipped 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 via a pipe, 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 via a pipe.

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

[0037] The technical solution of the glass tempering production line proposed in this invention, which can improve the tempering quality, has the following beneficial effects: Each heating tank in the convection heating device forms an independent convection heating chamber. By adjusting the input current and input voltage of the heating wire in the corresponding heating tank, the temperature of the hot air output from each heating tank can be matched with the heat absorption characteristics and temperature distribution of the corresponding part of the glass to be heated, thereby improving the uniformity of temperature distribution on the glass surface during the heating process. Furthermore, the quench air cooling system can reduce the temperature of the quench air output from the quench air fan to below room temperature, which can improve the cooling efficiency of the glass in the quench section, thereby reducing the generation of wind spots and flow marks on the glass surface, and thus improving the quality of tempered glass. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the installation structure of an embodiment of a glass tempering production line that can improve tempering quality according to the present invention;

[0039] Figure 2This is a schematic cross-sectional view of an embodiment of a convection heating device for a glass tempering production line that can improve tempering quality according to the present invention.

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

[0041] Figure 4 This is a schematic diagram of the heating air receiver.

[0042] Figure 5 for Figure 4 A structural schematic diagram of the air outlet panel viewed from below;

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

[0044] Figure 7 This is a schematic diagram of the structure of one embodiment of the heat exchange air box of the present invention;

[0045] Figure 8 This is a schematic diagram of the circulation path of cooling water and refrigerant in the rapid cooling air cooling system of the present invention.

[0046] The components include: 1. Heating furnace; 2. Convection heating device; 3. Cooling fan; 4. Quenching fan; 5. Quenching air cooling system; 6. Conveyor line;

[0047] Centrifugal fan 21; exhaust duct 22; heating air receiver 23; multiple heating wires 24; quench section air grille 31; cooling section air grille 32;

[0048] 51. Heat exchange air box; 52. Primary heat exchanger; 53. Secondary heat exchanger; 54. Cooling tower; 55. Screw chiller; 56. Insulated tank; 57. Circulating pump;

[0049] Air inlet 210; heating tank 230; air 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 Implementation

[0050] The following is in conjunction with the appendix Figure 1-8 The technical solution of the present invention will be further illustrated through specific embodiments.

[0051] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] A glass tempering production line for improving tempering quality includes a heating furnace 1 and a cooling air grid 3 sequentially mounted on a conveyor line 6, as well as a quench fan 4 and multiple convection heating devices 2. Along the operating direction, multiple convection heating devices 2 are spaced apart and installed on the heating furnace 1. Each convection heating device 2 includes a centrifugal fan 21, an exhaust duct 22, a heating air chamber 23, and multiple sets of heating wires 24. The centrifugal fan 21 is connected to the top of the heating air chamber 23 via the exhaust duct 22. Multiple sets of heating wires 24 are installed inside the heating air chamber 23. The heating air chamber 23 includes a fan... The enclosure 231, the air guide plate 232, and the air outlet plate 233 are provided. The air guide plate 232 is provided with multiple air guide holes 2321. The air guide holes 2321 penetrate the air guide plate 232. The air outlet plate 233 is provided with multiple air outlet holes 2331. The cooling air grid 3 is divided into a rapid cooling section air grid 31 and a cooling section air grid 32. The rapid cooling fan 4 is installed close to the rapid cooling section air grid 31 and delivers rapid cooling air to the rapid cooling section air grid 31 through an air supply duct. The enclosure also includes a rapid cooling air cooling system 5. The air outlet plate 233 is also provided with multiple recessed heating grooves 230.

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

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

[0056] Figure 1This is a schematic diagram of the installation structure of an embodiment of a glass tempering production line that can improve tempering quality according to the present invention. In the figure, the cooling fan 7 is installed close to the cooling section air grid 32 and delivers cooling air to the cooling section air grid 32 through the air supply pipe. Figure 2 This is a schematic diagram of the structure of one embodiment of the convection heating device 2 of the present invention; Figure 3 for Figure 2 An enlarged view of part A; Figure 4 This is a schematic diagram of the structure of the heating air receiver 23. Figure 4 The top of the air shroud 231 is provided with an air inlet 2310. The output end of the air duct 22 inputs the air to be heated into the heating air shroud 23 through the air inlet 2310. The front in the figure is the running direction of the glass. Figure 5 for Figure 4 The diagram shows the structure of the air outlet panel 233 from a bottom view.

[0057] It should be noted that the air pressure of the quenching fan 4, which provides quenching air to the quenching section air grid 31, is as high as 20,000 Pa. The impeller rotates at a high speed, and the friction between the air inside the quenching fan 4 and the impeller and inner wall is large, resulting in the air temperature output by the quenching fan 4 being close to 80°C.

[0058] In this invention, a glass tempering production line is provided, in which at least one set of heating wires is arranged in each heating tank 230, and a set of air outlet holes 2331 are arranged at the bottom of the heating tank 230. The air guide plate 232 covering the surrounding walls of the heating tank 230 has a set of air guide holes 2321 directly above the heating tank 230, so that each heating tank 230 forms an independent convection heating chamber. By adjusting the input current and input voltage of the heating wire 24 in the corresponding heating tank 230, the required hot air temperature of each heating tank 230 can be output, thereby avoiding the phenomenon of low temperature uniformity on the glass surface in the heating furnace 1. Furthermore, the quenching air cooling system 5 can reduce the temperature of the quenching air output by the quenching fan 4 to below room temperature, thereby improving the quenching efficiency of the glass in the quenching section and avoiding the occurrence of wind spots and flow marks. Therefore, the overall quality of glass tempering can be improved.

[0059] Furthermore, the heating air receiver 23 also includes multiple return air ducts 234;

[0060] The air cover 231 has multiple upper return air duct mounting holes 2311, and the air outlet plate 233 also has multiple lower return air duct mounting holes 2332.

[0061] The multiple upper return air duct mounting holes 2311 are divided into multiple groups, and the multiple lower return air duct mounting holes 2332 are divided into multiple groups; the multiple upper return air duct mounting holes 2311 in the same group and the multiple lower return air duct mounting holes 2332 in the same group correspond one-to-one and are arranged at intervals between two adjacent heating tanks 230.

[0062] The return air duct 234 is hollow; the outer peripheral surface of the lower end of the return air duct 234 is connected to the 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, the upper end of the return air duct 234 is exposed on the top surface of the air cover 231, and the outer peripheral surface of the upper end of the return air duct 234 is connected to the 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 faces downwards and is directly opposite the center of the top surface of the heating air package 23. The centrifugal fan 21 continuously delivers the air input from the air inlet 210 through the air duct 22 to the top of the heating air package 23, forming a circulating hot airflow.

[0064] like Figure 2-5 As shown, the hot airflow output through multiple air outlets 2331 is blown downwards to the surface of the glass to be heated. After the hot airflow comes into contact with the surface of the glass to be heated, it bounces upwards. Under the attraction of the air inlet 210 of the centrifugal fan 21, the rebounding hot airflow flows back to the top surface of the heating air receiver 23 through multiple return air pipes 234.

[0065] Compared with the existing technology of hot air recirculation through the periphery of the heating air receiver 23, the hot air recirculation speed of the present invention using multiple return air pipes 234 is fast and the recirculation efficiency is high, which is beneficial to improving the heating efficiency of the convection heating device 2.

[0066] Preferably, the air guide hole 2321 is an elongated through hole, and the length extension direction of the air guide hole 2321 is the same as the length extension direction of the heating groove 230;

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

[0068] The angle between the extending 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 elongated through-hole 2321 has lower wind resistance, which can reduce the flow rate loss of the airflow entering the heating tank 230 through the air guide plate 232, and help improve the heating efficiency of the convection heating device 2 on the glass to be heated.

[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, the surface area of ​​the glass to be heated between the two heating grooves 230 will lack hot airflow.

[0071] The extension direction of the heating tank 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 airflow on the surface of the glass to be heated.

[0072] Specifically, a plurality of 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 at intervals along the extension direction of the heating wire 24. The multiple columns of air guide holes 2321 and the multiple heating wires 24 are one above the other.

[0074] like Figure 3 , Figure 4 and Figure 6 As shown, the arrangement of the upper and lower opposing air guide holes 2321 and heating wire 24 can improve the heat exchange efficiency between the airflow entering the heating tank 230 through the air guide holes 2321 and the corresponding heating wire 24.

[0075] Furthermore, the far-infrared rays emitted by the heating wire 24 can also radiate through the elongated through-hole 2321 and enter the space between the air guide plate 232 and the air 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 2321, which can further improve the heating efficiency of the convection heating device 2.

[0076] In addition, the airflow entering the heating tank 230 through the air guide hole 2321 comes into contact with the corresponding heating wire 24. The airflow is dispersed and spreads to the surroundings, preventing the airflow from passing directly through the air guide hole 232 through the lower air outlet 2331 and blowing onto the surface of the glass to be heated. This helps to reduce 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 outward from the wind shield 231 and is exposed.

[0078] The air guide plate 232 located above the exposed heating tank 230 has a power cord insertion hole on its surface, which is used to install a power cord that is electrically connected to the corresponding heating wire 24.

[0079] like Figure 4As shown, the setting of one end of the heating tank 230 exposed to the air cover 231 can improve the convenience of installing the power cord of the heating wire 24, avoid the need to open a corresponding power cord mounting hole in the air cover 231, and simplify the internal structure of the heating air cover 23.

[0080] like Figure 2 and Figure 6 In the embodiment shown, the wind shield 231 is divided into two shields along the direction perpendicular to the glass movement;

[0081] One end of the two covers of the wind shield 231 is connected by a connecting plate 2312; an air inlet 2310 is provided in the middle of the cover, the output port of the air duct 22 is connected to the air inlet 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 has a connecting hole 23121, and the inner cavities of the two wind shields 231 are connected through the connecting hole 23121.

[0083] Centrifugal fans 21 input airflow from the left and right sides and through air ducts 22 into the two covers of the ventilation cover 231. The two covers of the ventilation cover 231 are connected by a connecting plate 2312 with a connecting hole 23121, which can keep the air pressure in the two covers balanced.

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

[0085] The inlet of the heat exchange air box 51 is connected to the outlet of the quench fan 4, and the outlet of the heat exchange air box 51 is connected to the quench air inlet of the cooling air grid 3 of the quench section air grid 31.

[0086] The primary heat exchanger 52 and the secondary heat exchanger 53 are respectively installed inside the heat exchange air box 51. The primary heat exchanger 52 is close to the inlet of the heat exchange air box 51, and the secondary heat exchanger 53 is close to the outlet of the heat exchange air 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 box 51.

[0088] Figure 7 This is a schematic diagram of the structure of the heat exchange air box 51 in the rapid cooling system 5 of the present invention. Figure 7 The dotted arrows indicate the direction in which the quenching air enters the heat exchange box 51.

[0089] The rapid cooling system 5 of the present invention uses a heat exchange box 51 with a primary heat exchanger 52 and a secondary heat exchanger 53 installed inside. The rapid cooling air input into the heat exchange box 51 can exchange heat through the circulating cooling water in the primary heat exchanger 52 and the circulating refrigerant in the secondary heat exchanger 53, so that the temperature of the rapid cooling air output from the heat exchange box 51 is lower than the room temperature.

[0090] Furthermore, the rapid cooling system 5 also includes a cooling 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 tower 54 via a pipe, and the cooling water outlet of the primary heat exchanger 52 is connected to the cooling water inlet of the cooling tower 54 via a pipe.

[0092] The refrigerant inlet of the secondary heat exchanger 53 is connected to the refrigerant outlet of the screw chiller 55 via a pipe, and the refrigerant outlet of the secondary heat exchanger 53 is connected to the refrigerant inlet of the screw chiller 55 via a pipe.

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

[0094] like Figure 8 As shown, when the room temperature is not higher than 30°C, the cooling water output from the cooling tower 54 is below 30°C. Then, through the primary heat exchanger 52, the quenching air output from the heat exchange box 51 can be cooled to below 30°C. The quenching air with a temperature below 30°C is then transported to the quenching section of the air grid, which can give the quenching section of the air grid good quenching efficiency, shorten the cooling time of the glass to be tempered 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. The temperature of the cooling water circulating through the cooling tower 54 is not lower than 30°C. At this time, the primary heat exchanger 52 alone cannot cool the blast air output from the heat exchange box 51 to below 30°C.

[0096] like Figure 8 As shown, the refrigerant temperature output by the screw chiller 55 is no higher than 15°C. When the temperature of the cooling water circulating through the cooling 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 to the heat exchange box 51, so that the temperature of the quenching air output from the heat exchange box 51 is reduced to below the temperature threshold (such as 25°C) set by the process control requirements, thereby ensuring the quenching efficiency of glass tempering.

[0097] Furthermore, the rapid cooling system 5 also includes a circulating pump 57;

[0098] The pipes connecting the refrigerant outlet of the secondary heat exchanger 53 and the refrigerant inlet of the screw chiller 55, as well as the pipes connecting the cooling water outlet of the primary heat exchanger 52 and the cooling water inlet of the cooling tower 54, are all equipped with circulating pumps 57.

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

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

[0101] Furthermore, the rapid cooling system 5 also includes an insulation tank 56;

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

[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 via a pipe, 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 via a pipe.

[0105] like Figure 8 As shown, the insulation tank 56 can store more refrigerant with a temperature below 15°C, so that after the screw chiller 55 is turned on, the secondary heat exchanger 53 can quickly exert a cooling effect, and the temperature of the quenching air output by the heat exchange air box 51 can be continuously kept below the set temperature threshold.

[0106] The cooling water from the cooling tower 54 can also be used to cool the screw in the screw chiller 55 by inputting cooling water into the screw cooling chamber, so as to prevent the screw in the screw chiller 55 from being damaged due to excessive temperature, thereby improving the operational 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 via two pipes respectively.

[0108] like Figure 8As shown, the screw chiller 55 has 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 air box 51 will be significantly lower than the temperature threshold set according to the process control requirements, resulting in improper use of refrigerant and waste. At this time, the refrigerant flow rate input to the secondary heat exchanger 53 of the screw chiller 55 can be reduced, and the remaining refrigerant flow rate can be input into the insulation tank 56 through the pipe connected to the refrigerant inlet of the insulation tank 56 to improve the utilization rate of refrigerant cooling capacity.

[0109] In summary, such as Figure 1-8 In the embodiment of the present invention shown, the glass tempering production line that improves tempering quality has each heating tank 230 in the convection heating device 2 forming an independent convection heating chamber. By adjusting the input current and input voltage of the heating wire 24 in the corresponding heating tank 230, the temperature of the hot air output from each heating tank 230 can be matched with the heat absorption characteristics and temperature distribution of the corresponding part of the glass to be heated, thereby improving the uniformity of temperature distribution on the glass surface during the heating process. Furthermore, the quench air cooling system 5 can reduce the temperature of the quench air output from the quench fan 4 to below room temperature, thereby improving the cooling efficiency of the glass in the quench section, and thus reducing the generation of wind spots and flow marks on the glass surface, improving the quality of tempered glass.

[0110] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A glass tempering production line for improving tempering quality, comprising a heating furnace and a cooling air grid sequentially mounted on a conveyor line, as well as a quenching fan and multiple convection heating devices; multiple convection heating devices are installed at intervals in the heating furnace along the operating direction, each convection heating device comprising a centrifugal fan, an exhaust pipe, a heating air chamber, and multiple sets of heating wires; the centrifugal fan is connected to the top of the heating air chamber through the exhaust pipe; multiple sets of heating wires are installed inside the heating air chamber; the heating air chamber includes an air chamber cover, a guide plate, and an outlet plate; the guide plate has multiple guide holes; the guide holes penetrate the guide plate; the outlet plate has multiple 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 pipe, characterized in that: It also includes a rapid cooling system; the air outlet plate is also provided with multiple recessed heating grooves; The rapid cooling system is installed in the rapid cooling air supply duct between the rapid cooling fan and the rapid cooling section air grid; the rapid cooling system is used to reduce the temperature of the rapid cooling air output by the rapid cooling fan to below room temperature. Multiple heating slots are arranged at intervals along the width of the heating furnace; each heating slot is provided with at least one set of heating wires; the bottom surface of the air guide plate abuts against the top surface of the surrounding walls of the heating slot; multiple air guide holes are divided into multiple groups, and a group of air guide holes is correspondingly distributed above each heating slot, with multiple air guide holes in the same group arranged at intervals. The multiple air outlets are divided into multiple groups, and each heating tank has a set of air outlets arranged on its bottom. The multiple air outlets are evenly arranged and penetrate the bottom of the heating tank.

2. The glass tempering production line for improving tempering quality according to claim 1, characterized in that, The heating air receiver also includes multiple return air pipes; The air cover has multiple upper return air duct mounting holes, and the air outlet plate also has multiple lower return air duct mounting holes; The multiple upper return air duct mounting holes are divided into multiple groups, and the multiple lower return air duct mounting holes are divided into multiple groups; the multiple upper return air duct mounting holes in the same group and the multiple lower return air duct mounting holes in the same group correspond one-to-one and are arranged at intervals between two adjacent heating tanks; The return air duct is hollow; the outer peripheral surface of the lower end of the return air duct is connected to the 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 envelope, and the outer peripheral surface of the upper end of the return air duct is connected to the wall of the upper return air duct mounting hole.

3. The glass tempering production line for improving tempering quality according to claim 1, characterized in that, The air guide hole is an elongated 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 tank is offset relative to the running direction of the glass; The angle between the extending direction of the heating tank and the running direction of the glass is 5-10°.

4. The glass tempering production line for improving tempering quality according to claim 3, characterized in that, The heating groove contains a plurality of heating wires, and the spirally coiled heating wires extend along the length of the heating groove. The multiple air guide holes in the same group are divided into multiple rows. The multiple air guide holes in the same row are arranged in a straight line at intervals along the extension direction of the heating wire. The multiple rows of air guide holes and the multiple heating wires are one above the other.

5. The glass tempering production line for improving tempering quality according to claim 1, characterized in that, Along the direction of glass movement, one end of the heating groove extends outward from the wind shield and is exposed. The air guide plate located above the exposed heating tank has a power cord insertion hole on its surface, which is used to install a power cord that is electrically connected to the corresponding heating wire.

6. The glass tempering production line for improving tempering quality according to claim 1, characterized in that, The rapid cooling system includes a heat exchange air box, a primary heat exchanger, and a secondary heat exchanger. The inlet of the heat exchange air box is connected to the outlet of the quench fan, and the outlet of the heat exchange air box is connected to the quench air inlet of the cooling air grid of the quench section air grid. The primary heat exchanger and the secondary heat exchanger are respectively installed inside the heat exchange air box. The primary heat exchanger is close to the inlet of the heat exchange air box, and the secondary heat exchanger is close to the outlet of the heat exchange air 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 box.

7. The glass tempering production line for improving tempering quality according to claim 6, characterized in that, The rapid cooling system also includes a cooling 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 via a pipe, and the cooling water outlet of the primary heat exchanger is connected to the cooling water inlet of the cooling water tower via a pipe. The refrigerant inlet of the secondary heat exchanger is connected to the refrigerant outlet of the screw chiller via a pipe, and the refrigerant outlet of the secondary heat exchanger is connected to the refrigerant inlet of the screw chiller via a pipe.

8. The glass tempering production line for improving tempering quality according to claim 7, characterized in that, The rapid cooling system also includes a circulating pump; The pipes connecting the refrigerant outlet of the secondary heat exchanger and the refrigerant inlet of the screw chiller, as well as the pipes connecting the cooling water outlet of the primary heat exchanger and the cooling water inlet of the cooling tower, are all equipped with circulating pumps.

9. The glass tempering production line for improving tempering quality according to claim 7, characterized in that, The rapid cooling system also includes an insulated tank; The refrigerant outlet of the secondary heat exchanger is connected to the refrigerant inlet of the insulation tank via a pipe, and the refrigerant outlet of the insulation tank is connected to the refrigerant inlet of the screw chiller via a pipe. The screw chiller is equipped 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 via a pipe, 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 via a pipe.

10. The glass tempering production line for improving tempering quality according to claim 9, characterized in that, The refrigerant outlet of the screw chiller is connected to the refrigerant inlet of the insulated tank and the refrigerant inlet of the secondary heat exchanger via two pipes.

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