Circulating convection heating type glass tempering equipment

Abstract

The invention provides circulating convection heating type glass tempering equipment, and relates to the technical field of glass tempering equipment, the circulating convection heating type glass tempering equipment comprises a main heating tempering box body, a rear sealing plate frame, a front sealing plate frame and a conveying frame, the rear side of the main heating tempering box body is in sliding connection with the rear sealing plate frame in the vertical direction, and the front sealing plate frame is in sliding connection with the conveying frame; a front sealing plate frame is slidably connected to the front side of the main heating tempering box body in the vertical direction, side U-shaped air ducts are arranged at the upper part and the lower part of the main heating tempering box body, upper circulating fans are arranged at the top and the bottom of the main heating tempering box body, upper air outlets are formed in the upper parts of the side U-shaped air ducts at the upper part of the main heating tempering box body in a penetrating manner, and lower air outlets are formed in the lower parts of the side U-shaped air ducts at the upper part of the main heating tempering box body; lower air inlets are formed in the two sides of the side U-shaped air channel. The upper and lower circulating fans drive airflow to contact the upper and lower surfaces of the glass, so that the upper and lower surfaces of the glass are uniformly heated, the temperature uniformity of the surface of the glass is improved, and the problem of large temperature difference between the upper and lower surfaces of the glass caused by a single-side radiation heating or single-direction convection heating mode of existing glass toughening equipment is solved.

Description

Technical Field

[0001] The invention relates to the technical field of glass tempering equipment, and in particular to a circulating convection heating type glass tempering equipment. Background Art

[0002] Glass tempering equipment is a device that processes ordinary glass into tempered glass. By uniformly heating the glass to near the softening point and then rapidly cooling it, compressive stress is formed on the surface of the glass and tensile stress is formed inside, thereby improving the strength and safety of the glass.

[0003] Existing glass tempering equipment mostly uses single-sided radiation heating or single-direction convection (top fan blowing downward) heating methods. This heating method results in a long heating time, and due to the combination of glass panels, there will be a large temperature difference between the upper and lower surfaces of the glass. The temperature difference between the upper and lower surfaces of the glass generally exceeds 10°C. The excessive temperature difference of the glass leads to a large stress difference between the upper and lower surfaces after tempering, which makes it more prone to edge warping or self-explosion risks. Summary of the invention

[0004] The present invention provides a circulating convection heating glass tempering equipment, in which upper circulating fans in upper and lower directions drive the airflow to be heated through heating elements and then blown toward the upper and lower surfaces of the glass, forming a symmetrical heat exchange, achieving uniform heating of the upper and lower surfaces of the glass, and synchronously heating the upper and lower surfaces to control the temperature difference between the upper and lower surfaces of the glass within ±3°C (the temperature difference of traditional radiation equipment is usually ≥10°C), ensuring the temperature of both sides of the glass to be consistent, and significantly improving the temperature uniformity of the glass surface. In the insulation stage, when the side baffles are in a vertical state, the upper and lower side U-shaped air ducts inside the main heating tempering box are interconnected to form an overall circulating convection, and only one of the upper and lower upper circulating fans and heating elements needs to be operated, thereby reducing the overall energy consumption and ensuring the uniform temperature inside the main heating tempering box, and reducing the insulation energy consumption by 40% compared with traditional equipment.

[0005] The present invention provides a circulating convection heating glass tempering equipment, which specifically comprises: a main heating tempering box body, a rear sealing plate frame, a front sealing plate frame and a conveying frame, wherein the rear side of the main heating tempering box body is vertically slidably connected with the rear sealing plate frame, the front side of the main heating tempering box body is vertically slidably connected with the front sealing plate frame, the lower part of the main heating tempering box body is provided with a conveying frame, the upper and lower parts of the main heating tempering box body are both provided with side U-shaped air ducts with a U-shaped structure, the top and bottom parts of the main heating tempering box body are both provided with upper circulation fans, the upper part of the side U-shaped air duct on the upper part of the main heating tempering box body is penetrated by an upper air outlet, the upper and lower parts of the main heating tempering box body are fixedly provided with heating elements, lower air inlets are provided on both sides of the side U-shaped air duct, and a middle baffle is protruding from the inner side of the lower air inlet.

[0006] Furthermore, an upper air outlet is formed through the lower part of the lower U-shaped air duct on the side of the lower part of the main heating and toughening box body. The upper air outlet and the upper circulation fan are arranged in central alignment. The heating element is located between the upper air outlets above and below the main heating and toughening box body, and on the upper and lower sides of the conveying rack. The heating element heats the air flow flowing out of the upper air outlet.

[0007] Furthermore, the middle part of the conveying rack passes through the middle part of the main heating and toughening box body. The lower air inlets are located on both sides of the conveying rack. The heating element is located on the upper and lower sides of the conveying rack. The middle baffle and the upper circulation fan are arranged in central alignment. The middle baffle reduces the air inlet space in the middle of the lower air inlets, so that the air flow enters evenly.

[0008] Furthermore, side baffles are symmetrically and rotatably arranged on the upper and lower sides of the middle part of the main heating and toughening box body. An outer connecting rod is fixedly arranged on the side surface of the side baffle. An outer connecting slide is horizontally slidably arranged on the outer side of the main heating and toughening box body. An electric screw rod is arranged on the outer side of the main heating and toughening box body. The electric screw rod is threadedly connected to the middle part of the outer connecting slide. The electric screw rod drives the outer connecting slide to move horizontally through the external thread. The outer connecting slide drives the outer connecting rod to rotate. The outer connecting rod rotates around the connection between the outer connecting rod and the main heating and toughening box body. The outer connecting rod and the side baffle rotate synchronously.

[0009] Furthermore, the chute of the outer connecting slide is slidably connected to the sliding column at the tail end of the outer connecting rod. The side baffle is located inside the lower air inlet. When the side baffle is in the horizontal state, the upper and lower side U-shaped air ducts of the main heating and toughening box body are in a partitioned state. The air flow in the main heating and toughening box body forms a circulating convection heating respectively above and below the conveying rollers along the side U-shaped air ducts. When the side baffle is in the vertical state, the side baffle fits and seals the lower air inlet. The upper and lower side U-shaped air ducts of the main heating and toughening box body are in a connected state. The air flow flows along the glass towards both sides and passes through the conveying rollers to another upper air outlet, and then completes the circulation along the side U-shaped air duct.

[0010] An upper tightening screw is screwed on the upper part of the rear sealing plate frame. A lower connecting pipe and an upper connecting pipe are respectively fixedly arranged on the upper and lower parts of the rear sealing plate frame. Inner connecting grooves are formed through the tails of the lower connecting pipe and the upper connecting pipe. The lower connecting pipe and the upper connecting pipe are connected by a middle air blower. The middle air blower connects the lower connecting pipe and the inner connecting groove to generate suction near the glass. The middle air blower discharges the air flow upwards to the upper connecting pipe, and the inner connecting groove of the upper connecting pipe discharges the air.

[0011] Furthermore, the rear sealing plate frame is located on one side of the outlet of the main heating and toughening box body. The upper tightening screw is in tight contact with the top of the main heating and toughening box body. The rear sealing plate frame moves up and down to adjust the distance from the lower conveying frame, and the upper tightening screw fixes the position of the rear sealing plate frame after movement. The inner communication groove is inside the rear sealing plate frame. The rear sealing plate frame is above the conveying frame, and there is a gap between the rear sealing plate frame and the glass to avoid direct contact with the high-temperature glass. The waste heat airflow (temperature ≥ 500 °C) on the glass outlet side is introduced into the interior of the main heating and toughening box body through the lower connecting pipe and the upper connecting pipe.

[0012] Furthermore, support springs are fixedly connected to both sides of the front sealing plate frame. Side connecting sliding columns are slidably connected to both sides of the front sealing plate frame. The lower part of the front sealing plate frame is rotatably provided with a lower roller shaft. The support springs support the front sealing plate frame to keep close contact with the top of the glass through the lower roller shaft. The front sealing plate frame is driven by the support springs to adjust up and down with the glass thickness (3 - 19 mm).

[0013] Furthermore, the upper ends of the support springs are fixedly connected to the main heating and toughening box body, and the upper ends of the side connecting sliding columns are fixedly connected to the main heating and toughening box body. Front sealing plate frames are arranged both above and below on one side of the inlet of the main heating and toughening box body, and a front sealing plate frame is arranged at the lower part on one side of the outlet of the main heating and toughening box body. During the process of the glass entering the main heating and toughening box body, when the cylindrical lower roller shaft contacts the glass, it moves upward and lifts. The lower roller shaft and the front sealing plate frame move upward synchronously and compress the support springs. The front sealing plate frame is driven by the support springs to automatically move and adjust with the glass thickness (3 - 19 mm), reducing the gap space between the main heating and toughening box body and the glass.

[0014] Furthermore, the conveying frame is linearly and arrayedly provided with rotating conveying rollers. The conveying rollers are kept synchronous by a chain. The conveying rollers are driven to rotate by a motor. The lower roller shaft of the front sealing plate frame at the lower part of the main heating and toughening box body rotates in contact with the conveying rollers. The front sealing plate frame reduces the gap space between the main heating and toughening box body and the glass, and reduces the hot airflow overflowing from the gap space between the main heating and toughening box body and the glass.

[0015] The present invention provides a circulating convection heating type glass toughening device, which has the following beneficial effects:

[0016] The upper and lower circulating fans drive the air flow in the up and down directions. After the air flow is heated by the heating element, it blows towards the upper and lower surfaces of the glass, forming a symmetric heat exchange to achieve uniform heating of the upper and lower surfaces of the glass. The synchronous heating of the upper and lower parts controls the temperature difference between the upper and lower surfaces of the glass within ±3°C (the temperature difference of traditional radiation equipment is usually ≥10°C), ensuring that the temperatures of both sides of the glass are consistent, significantly improving the temperature uniformity of the glass surface, and meeting the strict requirements for the consistency of tempering stress of automotive glass, household appliance glass, etc. The upper circulating fan accelerates the flow rate of the annular convection, enabling the glass to reach a heating rate of 15°C / min (for 6-mm-thick glass), further improving the heating efficiency of the glass compared with the radiation type and enhancing the heat preservation performance.

[0017] During the heating stage, when the side baffle is in the horizontal state, the upper and lower U-shaped air ducts circulate independently. The air flow in the main heating toughening chamber forms a circulating convection heating respectively above and below the conveying rollers along the side U-shaped air ducts. During the heat preservation stage, when the side baffle is in the vertical state, the upper and lower side U-shaped air ducts inside the main heating toughening chamber are interconnected to form an overall circulating convection. Only one of the upper and lower circulating fans and the heating element needs to operate, reducing the overall energy consumption and ensuring the uniformity of the temperature inside the main heating toughening chamber. The heat preservation energy consumption is reduced by 40% compared with traditional equipment.

[0018] The rear seal plate frame is located on the outlet side outside the main heating toughening chamber after the glass is heated and moved out. The middle fan guides the waste heat air flow (temperature ≥500°C) on the glass outlet side into the main heating toughening chamber through the lower connecting pipe and the upper connecting pipe, reducing the loss of the hot air flow inside the main heating toughening chamber caused by the space between the main heating toughening chamber and the glass, enhancing the heat preservation performance, and reducing the continuous working load of heating.

[0019] The upper front seal plate frame is in close contact with the top of the glass through the lower roller shaft, reducing the spaced area between the main heating toughening chamber and the glass. The front seal plate frame is automatically adjusted with the glass thickness (3 - 19 mm) through the support of the support spring, reducing the overflow of the hot air flow by 60%. The lower front seal plate frame is sealed by fitting with the conveying roller through the lower roller shaft, reducing the outflow of the hot air flow inside the main heating toughening chamber. The front seal plate frame moves downward through the support of the support spring to accommodate different thicknesses of glass, eliminating the need for manual adjustment of the front seal plate frame according to the glass thickness by personnel. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the present invention, the drawings of the present invention will be briefly introduced below.

[0021] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0022] In the drawings:

[0023] Figure 1Shows a schematic structural diagram of one side of the outlet of the main heating and toughening box body of the present application;

[0024] Figure 2 Shows a schematic structural diagram of one side of the inlet of the main heating and toughening box body of the present application;

[0025] Figure 3 Shows a schematic structural diagram of the main heating and toughening box body structure of the present application;

[0026] Figure 4 Shows a schematic structural diagram of the side U-shaped air duct structure of the present application;

[0027] Figure 5 Shows a schematic structural diagram of the rear sealing plate frame of the present application;

[0028] Figure 6 Shows a schematic structural diagram of the inner communication groove of the present application;

[0029] Figure 7 Shows a schematic structural diagram of the front sealing plate frame of the present application;

[0030] Figure 8 Shows a schematic structural diagram of the separated state of the main heating and toughening box body, rear sealing plate frame, front sealing plate frame and conveying frame of the present application;

[0031] List of reference numerals

[0032] 1. Main heating and toughening box body; 101. Side U-shaped air duct; 102. Upper air outlet; 103. Upper circulation fan; 104. Heating element; 105. Lower air inlet; 106. Middle baffle; 107. Side baffle; 108. Outer connecting rod; 109. Electric screw; 110. Outer connecting sliding frame;

[0033] 2. Rear sealing plate frame; 201. Upper tightening screw; 202. Lower connecting pipe; 203. Upper connecting pipe; 204. Middle fan; 205. Inner communication groove;

[0034] 3. Front sealing plate frame; 301. Support spring; 302. Side connecting sliding column; 303. Lower roller shaft;

[0035] 4. Conveying frame; 401. Conveying roller. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0037] The First Invention of the Present Invention: Please refer to Figures 1 to 8 :

[0038] The present invention provides a circulating convection heating type glass tempering device, including: a main heating and tempering box body 1, a rear sealing plate frame 2, a front sealing plate frame 3, and a conveying frame 4. U-shaped side U-shaped air ducts 101 are arranged at both the upper and lower parts of the main heating and tempering box body 1. Upper circulating fans 103 are arranged at both the top and bottom of the main heating and tempering box body 1. Upper air outlets 102 are penetrated and opened at the upper part of the side U-shaped air duct 101 at the upper part of the main heating and tempering box body 1. Heating elements 104 are fixedly arranged at both the upper and lower parts of the main heating and tempering box body 1. Lower air inlets 105 are opened on both sides of the side U-shaped air duct 101. Middle baffles 106 protrude inside the lower air inlets 105. Upper air outlets 102 are penetrated and opened at the lower part of the side U-shaped air duct 101 at the lower part of the main heating and tempering box body 1. The upper air outlets 102 and the upper circulating fans 103 are centered and aligned. The heating elements 104 are between the upper air outlets 102 at the upper and lower parts of the main heating and tempering box body 1. The heating elements 104 are on both the upper and lower sides of the conveying frame 4. The heating elements 104 heat the air flowing out of the upper air outlets 102. The middle part of the conveying frame 4 passes through the middle part of the main heating and tempering box body 1. The lower air inlets 105 are on both sides of the conveying frame 4. The heating elements 104 are on both the upper and lower sides of the conveying frame 4. The middle baffles 106 and the upper circulating fans 103 are centered and aligned. The middle baffles 106 reduce the air inlet space in the middle of the lower air inlets 105, so that the air flows in evenly, avoiding the situation that the air flow in the middle is large and the air flow on both sides is small. Side baffles 107 are symmetrically rotatably arranged at the upper and lower parts on both sides of the middle part of the main heating and tempering box body 1. Outer connecting rods 108 are fixedly arranged on the sides of the side baffles 107. An outer connecting slide frame 110 is horizontally slidably arranged on the outside of the main heating and tempering box body 1. An electric screw rod 109 is arranged on the outside of the main heating and tempering box body 1. The electric screw rod 109 is threadedly connected to the middle part of the outer connecting slide frame 110. The electric screw rod 109 drives the outer connecting slide frame 110 to move horizontally through the external thread. The outer connecting slide frame 110 drives the outer connecting rod 108 to rotate. The outer connecting rod 108 rotates around the connection part with the main heating and tempering box body 1. The outer connecting rod 108 and the side baffle 107 rotate synchronously, realizing the conversion of the side baffle 107 in the vertical and horizontal directions. The upper circulating fans 103 in the upper and lower two directions are started to drive the air flow to pass through the upper air outlets 102, contact the heating elements 104 to be heated, and then blow to the upper and lower surfaces of the glass, forming a symmetrical heat exchange and realizing the uniform heating of the upper and lower two surfaces of the glass;

[0039] A rear sealing plate frame 2 is slidably connected in the vertical direction at the rear side of the main heating and toughening box body 1. An upper tightening screw 201 is screwed on the upper part of the rear sealing plate frame 2. A lower connecting pipe 202 and an upper connecting pipe 203 are respectively and fixedly arranged at the upper and lower parts of the rear sealing plate frame 2. Inner connecting grooves 205 are respectively formed through the tails of the lower connecting pipe 202 and the upper connecting pipe 203. The lower connecting pipe 202 and the upper connecting pipe 203 are connected through a middle air blower 204. The middle air blower 204 connects the lower connecting pipe 202 and the inner connecting groove 205 to generate suction near the glass. The middle air blower 204 discharges the air flow upward to the upper connecting pipe 203, and the inner connecting groove 205 of the upper connecting pipe 203 discharges the air. A front sealing plate frame 3 is slidably connected in the vertical direction at the front side of the main heating and toughening box body 1. Support springs 301 are fixedly connected to both sides of the front sealing plate frame 3. Side connecting sliding columns 302 are slidably connected to both sides of the front sealing plate frame 3. A lower roller shaft 303 is rotatably arranged at the lower part of the front sealing plate frame 3. The support springs 301 support the front sealing plate frame 3 to keep it in close contact with the top of the glass through the lower roller shaft 303. The front sealing plate frame 3 is driven by the support springs 301 to adjust the height position up and down according to the glass thickness (3 - 19 mm). A conveying frame 4 is arranged at the lower part of the main heating and toughening box body 1. Rotating conveying rollers 401 are linearly arranged on the conveying frame 4. The conveying rollers 401 are kept synchronous by a chain. The conveying rollers 401 are driven to rotate by a motor. The lower roller shaft 303 of the front sealing plate frame 3 at the lower part of the main heating and toughening box body 1 is in rolling contact with the conveying rollers 401. The front sealing plate frame 3 reduces the interval space between the main heating and toughening box body 1 and the glass, reduces the situation of hot air flow overflowing outward from the interval space between the main heating and toughening box body 1 and the glass, and improves the heat preservation performance.

[0040] The chute of the outer connecting sliding frame 110 is slidably connected with the sliding column at the tail end of the outer connecting rod 108. The side baffle 107 is inside the lower air inlet 105. When the side baffle 107 is in a horizontal state, the upper and lower side U-shaped air ducts 101 of the main heating and toughening box body 1 are in a partition state. The air flow in the main heating and toughening box body 1 forms a circulating convection heating respectively above and below the conveying rollers 401 along the side U-shaped air ducts 101. When the side baffle 107 is in a vertical state, the side baffle 107 is hermetically attached to the lower air inlet 105. The upper and lower side U-shaped air ducts 101 of the main heating and toughening box body 1 are in a connected state. The air flow flows along the glass towards both sides and passes through the conveying rollers 401 to the other upper air outlet 102, and then completes the cycle along the side U-shaped air ducts 101. Only one of the upper and lower upper circulation blowers 103 and the heating elements 104 needs to operate, reducing the overall energy consumption.

[0041] In the embodiment of the present disclosure, the rear sealing plate frame 2 is located on one side of the outlet of the main heating and toughening box body 1. The upper tightening screw 201 is in tight contact with the top of the main heating and toughening box body 1. The rear sealing plate frame 2 moves up and down to adjust the distance from the lower conveying frame 4. The upper tightening screw 201 fixes the position of the rear sealing plate frame 2 after movement. The inner communication groove 205 is located inside the rear sealing plate frame 2. The rear sealing plate frame 2 is located above the conveying frame 4. The rear sealing plate frame 2 and the glass are arranged at intervals to avoid direct contact with the high-temperature glass. The waste heat air flow (temperature ≥ 500 °C) on the glass outlet side is introduced into the interior of the main heating and toughening box body 1 through the lower communication pipe 202 and the upper communication pipe 203 to realize the cyclic treatment of the hot air flow and reduce the loss of the hot air flow inside the main heating and toughening box body 1 to the outside.

[0042] In the embodiment of the present disclosure, the upper end of the support spring 301 is fixedly connected to the main heating and toughening box body 1, and the upper end of the side connection sliding column 302 is fixedly connected to the main heating and toughening box body 1. Front sealing plate frames 3 are arranged both above and below on one side of the inlet of the main heating and toughening box body 1, and a front sealing plate frame 3 is arranged at the lower part on one side of the outlet of the main heating and toughening box body 1. During the process of the glass entering the main heating and toughening box body 1, when the cylindrical lower roller shaft 303 contacts the glass, it moves upward and lifts. The lower roller shaft 303 and the front sealing plate frame 3 move upward synchronously and compress the support spring 301. The front sealing plate frame 3 is driven by the support spring 301 to automatically move and adjust according to the glass thickness (3 - 19 mm), reducing the gap space between the main heating and toughening box body 1 and the glass and reducing the situation of the hot air flow overflowing from the main heating and toughening box body 1 to the outside.

[0043] In the second aspect of the present invention, on the basis of the first aspect of the present invention, the front sealing plate frame 3 at the lower part of the main heating and toughening box body 1 is directly fixedly connected to the main heating and toughening box body 1. The lower roller shaft 303 of the front sealing plate frame 3 keeps in fit rotation with the conveying roller 401, eliminating the component settings of the support spring 301 and the side connection sliding column 302, reducing the number of components, simplifying the assembly process, and improving the production and installation efficiency.

[0044] Working principle of the present invention: Place the glass to be tempered on the conveying roller 401. The glass to be tempered is transferred into the main heating and tempering box body 1 by the rotation of the conveying roller 401. During the process of the glass entering the main heating and tempering box body 1, when the cylindrical lower roller shaft 303 contacts the glass, it lifts upward. The lower roller shaft 303 and the front sealing plate frame 3 move upward synchronously and compress the support spring 301. The support spring 301 supports the front sealing plate frame 3 to keep in close contact with the top of the glass through the lower roller shaft 303. The front sealing plate frame 3 is driven by the support spring 301 to automatically adjust according to the glass thickness (3 - 19 mm), reducing the spacing between the main heating and tempering box body 1 and the glass, and reducing the situation of hot air flowing outwards from the spacing between the main heating and tempering box body 1 and the glass, so that the amount of hot air overflow is reduced by 60%. The front sealing plate frame 3 moves downward through the support of the support spring 301 to accommodate different thickness glasses, without the need for personnel to manually adjust the front sealing plate frame 3 according to the glass thickness. The front sealing plate frame 3 at the lower part of the main heating and tempering box body 1 is in close contact with the conveying roller 401 through the lower roller shaft 303 for sealing, reducing the outflow of hot air inside the main heating and tempering box body 1;

[0045] After the glass enters the main heating and tempering box body 1, the upper and lower circulating fans 103 are started to drive the air flow to pass through the upper air outlet 102, contact the heating element 104, heat up and then blow to the upper and lower surfaces of the glass, forming a symmetric heat exchange to achieve uniform heating of the upper and lower surfaces of the glass. The glass needs to be heated to 670 - 690 degrees Celsius. The upper and lower synchronous heating controls the temperature difference between the upper and lower surfaces of the glass within ±3°C. The temperature difference of traditional radiation equipment is usually ≥10°C, ensuring that the temperatures of both sides of the glass are the same, significantly improving the temperature uniformity of the glass surface, reducing the stress gap, and meeting the strict requirements for the consistency of tempering stress of automotive glass, household appliance glass, etc. The upper circulating fan 103 accelerates the flow rate of the annular convection, enabling the heating rate of the glass to reach 15°C / min (for 6 mm thick glass), further improving the heating efficiency of the glass compared with the radiation type and enhancing the heat preservation performance;

[0046] During the heating stage, the air flow after contacting the glass enters the side U-shaped air duct 101 from the lower air inlet 105 and flows along the side U-shaped air duct 101 towards the upper circulation fan 103 to form an air flow circulation. When the side baffle 107 is in a horizontal state, the upper and lower side U-shaped air ducts 101 circulate independently. The air flow inside the main heating and toughening box body 1 forms a circulating convection heating respectively above and below the conveying roller 401 along the side U-shaped air duct 101. During the heat preservation stage, the electric screw 109 drives the outer connecting carriage 110 to move horizontally through the external thread. The outer connecting carriage 110 drives the outer connecting rod 108 to rotate. The outer connecting rod 108 rotates around the connection with the main heating and toughening box body 1. The outer connecting rod 108 and the side baffle 107 rotate synchronously. After the side baffle 107 rotates to a vertical state, the side baffle 107 closes the lower air inlet 105. The two upper air outlets 102 above and below serve as the circulation channels. The side U-shaped air ducts 101 above and below inside the main heating and toughening box body 1 are interconnected to form an overall circulating convection. After the air flow at the upper air outlet 102 contacts the glass, the air flow flows along the glass towards both sides and passes through the conveying roller 401 to the other upper air outlet 102, and then completes the circulation along the side U-shaped air duct 101. Only one of the two upper circulation fans 103 and the heating element 104 needs to operate, reducing the overall energy consumption and ensuring the uniform temperature inside the main heating and toughening box body 1. The heat preservation energy consumption is reduced by 40% compared with traditional equipment;

[0047] The rear sealing plate frame 2 is located on the outlet side outside the main heating and toughening box body 1 after the glass is heated. The rear sealing plate frame 2 and the glass are arranged at intervals to avoid direct contact with the high-temperature glass. After the middle fan 204 is started, suction is generated below. The middle fan 204 connects the lower connecting pipe 202 and the inner connecting groove 205 to generate suction near the glass. The middle fan 204 discharges the air flow upwards to the upper connecting pipe 203. The inner connecting groove 205 of the upper connecting pipe 203 discharges the air. The waste heat air flow (temperature ≥ 500 °C) on the glass outlet side is introduced into the main heating and toughening box body 1 through the lower connecting pipe 202 and the upper connecting pipe 203 to realize the circulating treatment of the hot air flow, reduce the situation that too much internal hot air flow leaks out due to the too large distance between the main heating and toughening box body 1 and the glass, further improve the heat preservation performance, and reduce the continuous working load of the heating element 104; Through the system integration of convection heating and sealing heat preservation, the uniformity error of the glass surface temperature is ≤ ±2 °C, and the deviation of the stress distribution after toughening is ≤ 5 MPa, meeting the requirements of the first-class products in GB / T 9963-2020 "Toughened Glass". It is especially suitable for precision toughening of large-sized curved glass with a diagonal of ≥ 3 m. Compared with traditional equipment, the unit energy consumption is reduced by more than 25%. The annual electricity saving can reach 500,000 kWh (calculated according to an annual output of 200,000 tons of glass), providing advanced equipment support for the industrial production of high-end toughened glass.

[0048] In this article, the following points need to be noted:

[0049] 1. The accompanying drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0050] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0051] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A circulating convection heating type glass tempering device, comprising: Main heating and toughening box body (1), rear sealing plate frame (2), front sealing plate frame (3) and conveying frame (4); it is characterized in that a rear sealing plate frame (2) is slidably connected in the vertical direction at the rear side of the main heating and toughening box body (1), a front sealing plate frame (3) is slidably connected in the vertical direction at the front side of the main heating and toughening box body (1), a conveying frame (4) is arranged at the lower part of the main heating and toughening box body (1), side U-shaped air ducts (101) are arranged at both the upper and lower parts of the main heating and toughening box body (1), upper circulation fans (103) are arranged at both the top and bottom of the main heating and toughening box body (1), upper air outlets (102) are formed through the upper part of the side U-shaped air duct (101) at the upper part of the main heating and toughening box body (1), heating elements (104) are fixedly arranged at both the upper and lower parts of the main heating and toughening box body (1), lower air inlets (105) are formed on both sides of the side U-shaped air duct (101), and a middle baffle (106) protrudes inside the lower air inlet (105).

2. The circulating convection heating type glass toughening device according to claim 1, characterized in that the lower part of the side U-shaped air duct (101) at the lower part of the main heating and toughening box body (1) is provided with an upper air outlet (102) formed through, the upper air outlet (102) and the upper circulation fan (103) are arranged in central alignment, the heating element (104) is between the upper air outlets (102) at the upper and lower parts of the main heating and toughening box body (1), and the heating element (104) is on both the upper and lower sides of the conveying frame (4).

3. The circulating convection heating type glass toughening device according to claim 2, characterized in that the middle part of the conveying frame (4) passes through the middle part of the main heating and toughening box body (1), the lower air inlets (105) are on both sides of the conveying frame (4), the heating elements (104) are on both the upper and lower sides of the conveying frame (4), and the middle baffle (106) and the upper circulation fan (103) are arranged in central alignment.

4. The circulating convection heating type glass toughening device according to claim 3, characterized in that side baffles (107) are symmetrically rotatably arranged at both the upper and lower parts on both sides of the middle part of the main heating and toughening box body (1), outer connecting rods (108) are fixedly arranged on the side surfaces of the side baffles (107), an outer connecting sliding frame (110) is horizontally slidably arranged on the outer side of the main heating and toughening box body (1), an electric screw rod (109) is arranged on the outer side of the main heating and toughening box body (1), and the electric screw rod (109) is threadedly connected to the middle part of the outer connecting sliding frame (110).

5. The circulating convection heating type glass toughening device according to claim 4, characterized in that the outer connecting sliding frame (110) is slidably connected to the tail ends of the outer connecting rods (108), the side baffles (107) are inside the lower air inlets (105), when the side baffles (107) are in a horizontal state, the upper and lower side U-shaped air ducts (101) of the main heating and toughening box body (1) are in a partition state, and when the side baffles (107) are in a vertical state, the side baffles (107) are attached and sealed to the lower air inlets (105), and the upper and lower side U-shaped air ducts (101) of the main heating and toughening box body (1) are in a communicating state.

6. A glass tempering device with cyclic convection heating according to claim 1, characterized in that An upper tightening screw (201) is screwed on the upper part of the rear sealing plate frame (2). A lower connecting pipe (202) and an upper connecting pipe (203) are respectively and fixedly arranged above and below the rear sealing plate frame (2). Inner connecting grooves (205) are respectively formed through the tails of the lower connecting pipe (202) and the upper connecting pipe (203). The lower connecting pipe (202) and the upper connecting pipe (203) are connected through a medium fan (204).

7. A glass tempering device with cyclic convection heating according to claim 6, characterized in that The rear sealing plate frame (2) is located on one side of the outlet of the main heating and tempering box body (1). The upper tightening screw (201) is in tight abutment with the main heating and tempering box body (1). The inner connecting groove (205) is located inside the rear sealing plate frame (2). The rear sealing plate frame (2) is located above the conveying frame (4).

8. A glass tempering device with cyclic convection heating according to claim 1, characterized in that Support springs (301) are fixedly connected to both sides of the front sealing plate frame (3). Side connecting sliding columns (302) are slidably connected to both sides of the front sealing plate frame (3). A lower roller shaft (303) is rotatably arranged at the lower part of the front sealing plate frame (3).

9. A glass tempering device with cyclic convection heating according to claim 8, characterized in that The upper ends of the support springs (301) are fixedly connected to the main heating and tempering box body (1). The upper ends of the side connecting sliding columns (302) are fixedly connected to the main heating and tempering box body (1). Front sealing plate frames (3) are respectively arranged above and below one side of the inlet of the main heating and tempering box body (1). A front sealing plate frame (3) is arranged at the lower part of one side of the outlet of the main heating and tempering box body (1).

10. A glass tempering device with cyclic convection heating according to claim 9, characterized in that Rotating conveying rollers (401) are arranged in a linear array on the conveying frame (4). The conveying rollers (401) are kept synchronous by a chain. The conveying rollers (401) are driven to rotate by a motor. The lower roller shaft (303) of the front sealing plate frame (3) at the lower part of the main heating and tempering box body (1) rotates in contact with the conveying rollers (401).

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