Electric heating glass heat treatment method and device

Abstract

The invention relates to the technical field of electric heating glass, in particular to a heat treatment method and device for electric heating glass. The electric heating glass heat treatment method comprises the steps from S10 to S50. S10 to S40, sequentially obtaining a first serial number and a second serial number of a to-be-electrified electrode plate; the electrode plates with the first number and the second number are controlled to be powered on, the current reaches a preset current value, and the heating duration is accumulated; controlling the electrode plates of the first number and the electrode plates of the second number to be powered off, and accumulating the power-off duration; and based on the power-off duration reaching a second preset duration, controlling the first number to accumulate 1. And S50, repeating the steps S20 to S40 until the first number reaches the total number of the electrode plates, and ending the circulation. Therefore, the electric heating glass is precisely subjected to local heat treatment through the plurality of electrode plates, so that the conductive film layer on the electric heating glass forms gradient change of square resistance, and the uniformity of the heating power density of the surface of the electric heating glass is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrically heated glass, and in particular to a method and device for heat treatment of electrically heated glass. Background Art

[0002] Electric heated glass refers to glass with electric heating function, which is usually used on windshields of vehicles such as airplanes, trains, cars and ships. Electric heated glass usually includes a glass body and a conductive film, which is transparent. The Joule heat generated by the conductive film of the electric heated glass after power is turned on can play the role of anti-icing and defogging. The conductive film is usually an ITO (IndiumTinOxide, referred to as ITO) film, which has good photoelectric properties and a resistivity between that of gold film and tin oxide film. The ITO film has good processing and etching properties. When it is used as a heating film, the ITO film needs to be etched into the required pattern, and then the paper cup bus bars on both sides of the film are connected to the wires, and it can be used as a heating film. The surface temperature of the electric heated glass needs to be uniform to ensure safety. If the temperature difference on the electric heated glass is large, it is easy to burst. For special-shaped electric heated glass, temperature uniformity is more difficult to control. Therefore, the surface resistance of the special-shaped ITO film needs to have a certain gradient change so that the ITO film has a uniform heating power density, thereby achieving the effect of uniform surface temperature of the electric heated glass.

[0003] Most of the special-shaped electrically heated glass uses infrared heating lamps for heat treatment. By controlling the heating effect of different areas on the electrically heated glass through multiple heating lamps, different resistance values ​​can be achieved in different areas. However, when using heating lamps to heat treat the electrically heated glass, it is necessary to keep a certain distance between the heating lamps and the ITO film, and the temperature radiated by the heating lamps to the electrically heated glass is not accurate enough. When multiple lamps are arranged densely, the heat range radiated by adjacent heating lamps on the electrically heated glass will overlap, making it difficult to accurately perform local heat treatment on the electrically heated glass, resulting in inaccurate control of the resistance gradient of the ITO film, and ultimately resulting in uneven heating power density on the surface of the electrically heated glass. Summary of the invention

[0004] In order to solve the problem of low precision in local heat treatment of a conductive film of electrically heated glass, the present invention provides a heat treatment method and device for electrically heated glass.

[0005] In a first aspect, the present invention provides a method for heat treating electrically heated glass, comprising:

[0006] Step S10, based on the completion of positioning of the electrically heated glass in the vacuum chamber, obtaining a first number and a second number of the electrode sheets to be energized; the electrically heated glass comprises a glass layer and a conductive film layer; the glass layer and the conductive film layer are fixedly connected; when the electrically heated glass is positioned, the conductive film layer is attached to a plurality of the electrode sheets, and the electrically heated glass is located above the electrode sheets; the plurality of the electrode sheets are sequentially spaced and numbered in ascending order according to positive integers; the first number and the second number are both positive integers; the first number is 1;

[0007] Step S20, obtaining the length dimension of the electrically heated glass corresponding to the position of the electrode sheet with the first number, controlling the electrode sheets with the first number and the second number to be energized and making the current reach a preset current value, and accumulating the heating time; the length dimension of the electrically heated glass is the dimension along the length direction of the electrode sheet; the electric heating power of the conductive film layer between the electrode sheets with the first number and the second number is negatively correlated with the length dimension of the electrically heated glass; the preset current value is related to the following formula:

[0008] P=I 2 R;

[0009] Wherein, P is the electrothermal power; I is the preset current value; R is the resistance value of the conductive film layer between the electrode sheets with the first number and the second number;

[0010] Step S30, based on the heating time reaching a first preset time, controlling the first-numbered electrode sheet and the second-numbered electrode sheet to be powered off, and accumulating the power-off time;

[0011] Step S40, based on the power-off duration reaching a second preset duration, controlling the first number to be accumulated by 1;

[0012] Step S50, repeating the steps S20 to S40 until the first number reaches the total number of the electrode sheets, and then ending the cycle.

[0013] In some embodiments, step S40 includes:

[0014] Step S41, based on the power-off duration reaching a second preset duration, controlling the electrode sheet with the first number to descend to be separated from the conductive film layer;

[0015] Step S42: Based on the electrode sheet with the first number being separated from the conductive film layer, controlling the first number to be accumulated by 1.

[0016] In some embodiments, step S41 includes:

[0017] Step S411, based on the power-off duration reaching a second preset duration, controlling the electrode sheet with the first number to descend to be separated from the conductive film layer;

[0018] Step S412, based on the power-off duration reaching a second preset duration and the difference between the third number and the second number being greater than 0, controlling the electrode sheet with the third number to descend to be separated from the conductive film layer; the sum of the third number and the first number is equal to the total number of the electrode sheets plus 1;

[0019] The step S42 includes: controlling the first number to be accumulated by 1 based on the electrode sheets with the first number and the third number being separated from the conductive film layer.

[0020] In some embodiments, the step S41 further includes:

[0021] Step S413, based on the power-off duration reaching a second preset duration and the third number being equal to the second number, controlling the electrode sheets of the first number and the third number to maintain a state of adhesion with the conductive film layer, and controlling the first number to be accumulated by 1.

[0022] In some embodiments, the second number is equal to the total number of the electrode sheets.

[0023] In some embodiments, the second number is equal to the first number plus 1.

[0024] In a second aspect, the present invention provides an electrically heated glass heat treatment device, which is applied to the electrically heated glass heat treatment method in the first aspect. The electrically heated glass heat treatment device comprises:

[0025] A support assembly, the support assembly comprising a supporting unit and a lifting frame unit; the supporting unit comprising a support body and a plurality of supporting blocks; the supporting blocks are detachably connected to the support body, the lifting frame unit comprising a plurality of lifting parts; the lifting parts are vertically slidably connected to the support body; a plurality of the supporting blocks are arranged around the lifting frame unit;

[0026] A heating component, the heating component comprises a plurality of electrode sheets; the electrode sheets are in the shape of long strips; the plurality of electrode sheets are arranged in sequence and at intervals; the lifting part is arranged in one-to-one correspondence with the electrode sheets; the electrode sheets are detachably connected to the lifting part.

[0027] In some embodiments, the electrically heated glass heat treatment device further comprises a pressurizing assembly, which comprises a pressurizing drive unit and a pressurizing head; the pressurizing drive unit drives the pressurizing head to rise and fall; the pressurizing head is located at the center of the plurality of support blocks.

[0028] In some embodiments, the pressure head is a suction cup.

[0029] In some embodiments, the lifting part includes a plurality of lifting elements; the plurality of lifting elements are arranged in sequence along the length of the electrode sheet; the lifting elements are vertically slidably connected to the bracket body; the electrode sheet is a flexible electrode sheet; the electrode sheet is detachably connected to the corresponding plurality of lifting elements.

[0030] In order to solve the problem of low heat treatment precision of electrically heated glass, the present invention has the following advantages:

[0031] By accurately annealing different areas of the conductive film layer through multiple electrode sheets, the resistance value of different areas of the conductive film layer can be accurately controlled, and the precise change of the surface resistance of the conductive film layer in different areas can be achieved, that is, the gradient change of the block resistance formed by the conductive film layer, so as to make the surface heating power density of the electrically heated glass uniform, thereby achieving the purpose of reducing the surface temperature difference of the electrically heated glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A flow chart of a heat treatment method for electrically heated glass according to an embodiment is shown;

[0033] Figure 2 A schematic structural diagram of an electrically heated glass according to an embodiment is shown;

[0034] Figure 3 A schematic diagram showing the structure of an electrode sheet of an electrically heated glass heat treatment device according to an embodiment;

[0035] Figure 4 A schematic structural diagram of an electrically heated glass heat treatment device according to an embodiment is shown;

[0036] Figure 5 A schematic diagram showing the structure of an installation assembly of an electrically heated glass heat treatment device according to an embodiment;

[0037] Figure 6 A schematic diagram showing the positional relationship between an electrically heated glass and a plurality of electrode sheets according to an embodiment;

[0038] Figure 7 Another schematic diagram showing the positional relationship between an electrically heated glass and a plurality of electrode sheets according to an embodiment is shown.

[0039] Reference numerals:

[0040] 10. Electric heating glass; 11. Glass layer; 12. Conductive film layer; 20. Electrode sheet; 21. Foam copper layer; 22. Copper foil layer; 30. Bracket assembly; 31. Support unit; 311. Bracket body; 312. Support block; 32. Lifting frame unit; 40. Installation assembly; 41. Installation frame; 42. Support block; 43. Receiving slot. DETAILED DESCRIPTION

[0041] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0042] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0043] The special-shaped electrically heated glass 10 used for windshields of automobiles, ships, airplanes, trains, etc. is mostly heat-treated by infrared heating lamps. The heating effect of different areas on the electrically heated glass 10 is controlled by multiple heating lamps, and different resistance values ​​can be achieved in different areas. However, when the electrically heated glass 10 is heat-treated by the heating lamp, the heat of the heating lamp is concentrated near the heating lamp itself. Therefore, in order to ensure a certain temperature uniformity, the heating lamp needs to be kept at a certain distance from the ITO film. Even so, the temperature uniformity is difficult to be well controlled. And the heating lamp relies on radiation to transfer heat, and the temperature radiated to the electrically heated glass 10 is not accurate enough. When multiple lamps are arranged densely, the heat range radiated by adjacent heating lamps on the electrically heated glass 10 will overlap. Therefore, based on the fact that the heat of the electric heating lamp is not uniform enough, the temperature radiated to the electric heated glass 10 is not accurate enough, and the heat radiation range between adjacent electric heating lamps overlaps, it is not easy to efficiently and accurately control the local heat treatment effect of the electrically heated glass 10. Therefore, in order to accurately perform local heat treatment on electrically heated glass, improve the resistance gradient accuracy of the conductive film, and achieve better uniformity of heating power density on the surface of electrically heated glass, the present invention provides a heat treatment method and device for electrically heated glass 10.

[0044] In this embodiment, refer to Figure 1 , Figure 2 and Figure 3 In a first aspect, a heat treatment method for electrically heated glass 10 is provided, comprising the following steps S10 to S50.

[0045] Step S10, based on the completion of positioning of the electrically heated glass 10 in the vacuum chamber, obtain the first number and the second number of the electrode sheet 20 to be energized. The electrically heated glass 10 includes a glass layer 11 and a conductive film layer 12, and the glass layer 11 and the conductive film layer 12 are fixedly connected. Specifically, the conductive film layer 12 can be an ITO film, and the ITO film can be plated on the surface of the glass layer 11 by magnetron sputtering. When the electrically heated glass 10 is positioned in the vacuum chamber, the conductive film layer 12 is attached to a plurality of electrode sheets 20, and the electrically heated glass 10 is located above the electrode sheets 20. The vacuum degree in the vacuum chamber can be lower than 6.0×10 -4Pa, so as to avoid the conductive film layer 12 from reacting with oxygen as much as possible, which will affect the resistance value of the conductive film layer 12. Specifically, the electrically heated glass 10 can be pressed against a number of electrode sheets 20 by its own weight to achieve a better fit between the two. The electrode sheet 20 may include a foam copper layer 21 and two layers of copper foil layers 22, and the foam copper layer 21 is bonded between the two layers of copper foil layers 22. Power is supplied to any two electrode sheets 20 so that a potential difference is generated between the two electrode sheets 20, thereby generating current on the conductive film layer 12 between the two electrode sheets 20, thereby generating Joule heat, and realizing annealing of the electrically heated glass 10. A number of electrode sheets 20 are arranged in sequence and numbered in ascending order according to positive integers. The first number and the second number are both positive integers. In step S10, the first number is 1, that is, the initial value of the first number is 1.

[0046] Step S20, obtaining the length dimension of the electrically heated glass 10 corresponding to the position of the first numbered electrode sheet 20, controlling the first numbered and the second numbered electrode sheets 20 to be energized and making the current reach a preset current value, and accumulating the heating time. The length dimension of the electrically heated glass 10 is the dimension along the length direction of the electrode sheet 20, and the electric heating power of the conductive film layer 12 between the first numbered and the second numbered electrode sheets 20 is negatively correlated with the length dimension of the electrically heated glass 10. The preset current value is related to the following formula:

[0047] P=I 2 R;

[0048] Wherein, P is the electric heating power, I is the preset current value, and R is the resistance value of the conductive film layer 12 between the first numbered and the second numbered electrode sheets 20. It should be understood that in the area where the length dimension of the electrically heated glass 10 is larger, R is smaller. It should be understood that, under the condition of a certain heat treatment time, the greater the electric heating power, the smaller the resistance value of the conductive film layer 12 after heat treatment. Since the electrically heated glass 10 can be in various shapes, for the special-shaped electrically heated glass 10, the area with a shorter length is prone to heat concentration, and the heat in the area with a longer length is more dispersed. Therefore, it is necessary to reduce the surface resistance of the conductive film layer 12 in the area with a smaller length dimension, and increase the surface resistance of the conductive film layer 12 in the area with a larger length dimension, so that the surface resistance on the conductive film layer 12 changes continuously, and then the heat on the surface of the conductive film layer 12 tends to be uniform, that is, the thermal power density of the conductive film layer 12 tends to be uniform, and the temperature difference between different areas on the surface of the electrically heated glass 10 is reduced, thereby ensuring the safety of the electrically heated glass 10 during use.

[0049] Step S30, based on the heating time reaching the first preset time, controlling the first numbered electrode sheet 20 and the second numbered electrode sheet 20 to be powered off, and accumulating the power-off time. The first preset time can be determined according to the specific shape and size of the electrically heated glass 10.

[0050] Step S40, based on the power-off duration reaching the second preset duration, controlling the first number to be accumulated by 1. The second preset duration can be determined according to the specific shape and size of the electrically heated glass 10. The heat generated by the resistance of the conductive film itself is used to heat treat itself, and the temperature and range of the heat treatment can be accurately controlled. Furthermore, by controlling the power-off duration to reach the second preset duration, the mutual influence between two adjacent heating areas can be further reduced.

[0051] Step S50 , repeating steps S20 to S40 until the first number reaches the total number of electrode sheets 20 , ending the cycle, and completing the heat treatment of the electrically heated glass 10 .

[0052] In other embodiments, the electrically heated glass 10 is trapezoidal, the lengths of the plurality of electrode sheets 20 are equal, and the resistance values ​​of the conductive film layer 12 between each group of adjacent electrode sheets 20 are equal. In this case, when the top portion of the electrically heated glass 10 with a shorter length is heat treated, the preset current value should be larger, and when the bottom portion of the electrically heated glass 10 with a longer length is heat treated, the preset current value should be smaller.

[0053] In other embodiments, the electrically heated glass 10 is a trapezoid. As the number of electrode sheets 20 gradually increases, the lengths thereof also gradually increase. It should be understood that when the two bottom angles of the trapezoid of the electrically heated glass 10 are small, when the top of the electrically heated glass 10 with a smaller length dimension is heat-treated, the preset current value may be smaller; when the bottom of the electrically heated glass 10 with a larger length dimension is heat-treated, the preset current value may be larger. The numerical setting of the specific preset current value needs to be determined according to the specific shape and size of the electrically heated glass 10 and the length of the electrode sheet 20, and finally the electric heating power of the conductive film layer 12 between the first numbered and the second numbered electrode sheets 20 is negatively correlated with the length dimension of the electrically heated glass 10. That is, the larger the length dimension of the electrically heated glass 10, the smaller the electric heating power needs to be during the heat treatment process.

[0054] In this embodiment, step S40 includes the following steps S41 to S42.

[0055] Step S41, based on the power-off duration reaching the second preset duration, controlling the first numbered electrode sheet 20 to descend to be separated from the conductive film layer 12. By controlling the first numbered electrode sheet 20 to be separated from the conductive film layer 12, the influence of the heat carried by the electrode sheet 20 that has passed through electricity on the subsequent heat treatment steps of the electrically heated glass 10 can be further reduced.

[0056] Step S42, based on the electrode sheet 20 with the first number being separated from the conductive film layer 12, the first number is controlled to be accumulated by 1. Specifically, after the electrode sheet 20 with the first number being 1 is powered on, the electrode sheet 20 with the first number being 1 is lowered, and then the electrode sheet 20 with the number being 2 and the electrode sheet 20 with the second number are powered on. The second number can be set to a corresponding value according to actual needs.

[0057] In this embodiment, step S41 includes the following steps S411 to S412.

[0058] Step S411 , based on the power-off duration reaching a second preset duration, controlling the electrode sheet 20 with a first number to descend and separate from the conductive film layer 12 .

[0059] Step S412, based on the power-off duration reaching the second preset duration, and the difference between the third number and the second number is greater than 0, the electrode sheet 20 with the third number is controlled to descend to be separated from the conductive film layer 12. The sum of the third number and the first number is equal to the total number of electrode sheets 20 plus 1. Specifically, the electrode sheet 20 with the third number is symmetrically arranged with the electrode sheet 20 with the first number about the center of the electrically heated glass 10. Since the supporting effect at the bottom of the electrically heated glass 10 changes after the electrode sheet 20 with the first number descends, in order to make the supporting structure of the electrically heated glass 10 symmetrical, so as to avoid the electrically heated glass 10 from tilting and deforming. Therefore, the electrode sheets 20 distributed at the symmetrical positions at both ends of the electrically heated glass 10 are all lowered, which can improve the symmetry of the supporting effect and the stability of the electrically heated glass 10.

[0060] Step S42 includes: controlling the first number to be incremented by 1 based on the electrode sheets 20 with the first number and the third number being separated from the conductive film layer 12 .

[0061] In this embodiment, step S41 further includes:

[0062] Step S413, based on the power-off duration reaching the second preset duration and the third number being equal to the second number, the electrode sheets 20 with the first number and the third number are controlled to maintain the state of being attached to the conductive film layer 12, and the first number is controlled to be accumulated by 1. Specifically, since the first number and the third number are variable values, when the third number is equal to the second number, since the electrode sheet 20 with the second number needs to participate in the power-on heat treatment, the electrode sheet 20 with the second number needs to maintain the state of being attached to the conductive film layer 12, so at this time, there is no need to reduce the electrode sheets 20 with the first number and the third number, so as to ensure the smooth progress of the heat treatment process.

[0063] In the present embodiment, the second number is equal to the total number of electrode sheets 20. That is, when the initial value of the first number is 1, the electrode sheets 20 with the first number and the electrode sheets 20 with the second number are located at the two end positions of the electrically heated glass 10. The second number is a fixed value. Specifically, when the total number of electrode sheets 20 is 5, the electrode sheets 20 numbered 1 and 5 are first powered on for the first preset time and then powered off, and then the electrode sheets 20 numbered 2 and 5 are powered on for the first preset time and then powered off, and then the electrode sheets 20 numbered 3 and 5 are powered on for the first preset time and then powered off, and finally the electrode sheets 20 numbered 4 and 5 are powered on for the first preset time and then powered off, to complete the heat treatment of the electrically heated glass 10. It should be understood that the change of the preset current value at each power-on in the present embodiment can be kept unchanged, or can be increased or decreased in sequence, which needs to be determined according to the specific shape of the electrically heated glass 10.

[0064] In this embodiment, the second number is equal to the first number plus 1. That is, when the initial value of the first number is 1, the initial value of the second number is 2. Therefore, the second number changes with the change of the first number. Specifically, when the total number of electrode sheets 20 is 5, the electrode sheets 20 numbered 1 and 2 are first powered on for a first preset period of time and then powered off, and then the electrode sheets 20 numbered 2 and 3 are powered on for a first preset period of time and then powered off, and then the electrode sheets 20 numbered 3 and 4 are powered on for a first preset period of time and then powered off, and finally the electrode sheets 20 numbered 4 and 5 are powered on for a first preset period of time and then powered off, thereby completing the heat treatment of the electrically heated glass 10. Specifically, taking the shape of the electrically heated glass 10 as a trapezoid as an example, refer to Figure 6 When the lengths of the electrode sheets 20 are equal, since the resistance values ​​are equal each time the power is turned on, the preset current value should be gradually decreased. Figure 7 When the length of some electrode sheets 20 is greater than the maximum length of the electrically heated glass 10, the fitting size of the electrode sheets 20 and the electrically heated glass 10 is equal to the length of the electrically heated glass 10 at the position corresponding to the electrode sheets 20. Figure 7 The electrode sheet 20 shown in the figure refers to the fitting size between the electrode sheet 20 and the electrically heated glass 10, that is, the heat treatment area is also trapezoidal each time the power is turned on, and the resistance value gradually decreases. At this time, the preset current value can gradually increase, gradually decrease or remain unchanged, which can be specifically determined according to the size of the trapezoidal bottom angle of the electrically heated glass 10.

[0065] In this embodiment, refer to Figure 2 and Figure 4 In a second aspect, a heat treatment device for electrically heated glass 10 is provided, which is applied to the heat treatment method for electrically heated glass 10 in the first aspect. The heat treatment device for electrically heated glass 10 includes a support assembly 30 and a heating assembly.

[0066] The support assembly 30 includes a supporting unit 31 and a lifting frame unit 32. The supporting unit 31 includes a support body 311 and a plurality of supporting blocks 312, and the supporting blocks 312 are detachably connected to the support body 311. The lifting frame unit 32 includes a plurality of lifting parts, and the lifting parts are vertically slidably connected to the support body 311. The plurality of supporting blocks 312 are arranged around the lifting frame unit 32. The electrically heated glass 10 is placed on the plurality of supporting blocks 312, so that the supporting blocks 312 are distributed at the edge of the electrically heated glass 10.

[0067] The heating assembly includes a plurality of electrode sheets 20, which are in the shape of long strips, and are arranged in sequence and parallel to each other. The lifting part is arranged one by one with the electrode sheets 20, and the electrode sheets 20 and the lifting part are detachably connected. The height of the electrode sheets 20 can be adjusted by the lifting part to improve the degree of adhesion between the electrode sheets 20 and the conductive film layer 12 of the electrically heated glass 10. The lifting part can be driven by a servo motor or a cylinder.

[0068] Thus, through the cooperation between the bracket assembly 30 and the heating assembly, the electrically heated glass 10 can be subjected to zoned heat treatment using a plurality of electrode sheets 20, thereby achieving precise and continuous changes in the surface resistance of the conductive film layer 12 in different areas, thereby making the surface heating power density of the electrically heated glass 10 uniform, thereby achieving the purpose of reducing the surface temperature difference of the electrically heated glass 10.

[0069] In this embodiment, the heat treatment device for the electrically heated glass 10 further includes a pressurizing assembly, which includes a pressurizing driving unit and a pressurizing head. The pressurizing head is located above the electrically heated glass 10, and the pressurizing driving unit drives the pressurizing head to rise and fall, so that the pressurizing head can be pressed against the upper surface of the electrically heated glass 10. The pressurizing head is located at the center of the plurality of support blocks 312. Thus, the pressurizing head applies a pressing force to the center of the electrically heated glass 10, thereby improving the pressing stability of the pressurizing head on the electrically heated glass 10.

[0070] In other embodiments, a plurality of pressure heads may be provided, and the plurality of pressure heads need not be concentrated at the center of the electrically heated glass 10, and the plurality of pressure heads may be dispersed above the electrically heated glass 10, so as to achieve compression of different positions of the electrically heated glass 10, and further improve the compression stability. In the case where the electrically heated glass 10 is a curved surface, the plurality of pressure heads can greatly improve the bonding effect between the electrically heated glass 10 and the plurality of electrode sheets 20.

[0071] In this embodiment, the pressure head is a suction cup, which can produce a good pressing effect on the electrically heated glass 10 and is not easy to damage the electrically heated glass 10.

[0072] In this embodiment, the lifting part includes a plurality of lifting elements, which are arranged in sequence along the length of the electrode sheet 20. The lifting elements are connected to the bracket body 311 in a vertical sliding manner, and the electrode sheet 20 is a flexible electrode sheet 20, which is detachably connected to the corresponding plurality of lifting elements. The flexible electrode sheet 20 can better adapt the electrode sheet 20 to the curved electrically heated glass 10.

[0073] In other embodiments, reference Figure 2 , Figure 4 and Figure 5 In order to adapt to electrically heated glass 10 of different shapes, the heat treatment device for electrically heated glass 10 further includes a mounting assembly 40, the mounting assembly 40 includes a mounting frame 41 and a support block 42, and a receiving groove 43 adapted to the shape of the electrically heated glass 10 is provided on the mounting frame 41. A plurality of support blocks 42 are provided, and the plurality of support blocks 42 are detachably connected to the mounting frame 41, and the support blocks 42 are distributed at the edge of the receiving groove 43. Therefore, when the mounting frame 41 is placed on a plurality of support blocks 312, the electrically heated glass 10 can be placed in the receiving groove 43, so that the plurality of support blocks 42 can be supported at the lower edge of the electrically heated glass 10. Therefore, by replacing different mounting assemblies 40, it is possible to realize reliable positioning of electrically heated glass 10 of different shapes.

[0074] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A method for heat treatment of electrically heated glass, characterized in that: The electrically heated glass heat treatment method comprises: Step S10, based on the completion of positioning of the electrically heated glass in the vacuum chamber, obtaining a first number and a second number of the electrode sheets to be energized; the electrically heated glass comprises a glass layer and a conductive film layer; the glass layer and the conductive film layer are fixedly connected; when the electrically heated glass is positioned, the conductive film layer is attached to a plurality of the electrode sheets, and the electrically heated glass is located above the electrode sheets; the plurality of the electrode sheets are sequentially spaced and numbered in ascending order according to positive integers; the first number and the second number are both positive integers; the first number is 1; Step S20, obtaining the length dimension of the electrically heated glass corresponding to the position of the electrode sheet with the first number, controlling the electrode sheets with the first number and the second number to be energized and making the current reach a preset current value, and accumulating the heating time; the length dimension of the electrically heated glass is the dimension along the length direction of the electrode sheet; the electric heating power of the conductive film layer between the electrode sheets with the first number and the second number is negatively correlated with the length dimension of the electrically heated glass; the preset current value is related to the following formula: P=I 2 R; Wherein, P is the electrothermal power; I is the preset current value; R is the resistance value of the conductive film layer between the electrode sheets with the first number and the second number; Step S30, based on the heating time reaching a first preset time, controlling the first-numbered electrode sheet and the second-numbered electrode sheet to be powered off, and accumulating the power-off time; Step S40, based on the power-off duration reaching a second preset duration, controlling the first number to be accumulated by 1; Step S50, repeating the steps S20 to S40 until the first number reaches the total number of the electrode sheets, and then ending the cycle.

2. The method for heat treatment of electrically heated glass according to claim 1, characterized in that: The step S40 comprises: Step S41, based on the power-off duration reaching a second preset duration, controlling the electrode sheet with the first number to descend to be separated from the conductive film layer; Step S42 , based on the electrode sheet with the first number being detached from the conductive film layer, controlling the first number to be accumulated by 1.

3. A heat treatment method for electrically heated glass according to claim 2, characterized in that: The step S41 comprises: Step S411, based on the power-off duration reaching a second preset duration, controlling the electrode sheet with the first number to descend to be separated from the conductive film layer; Step S412, based on the power-off duration reaching a second preset duration and the difference between the third number and the second number being greater than 0, controlling the electrode sheet with the third number to descend to be separated from the conductive film layer; the sum of the third number and the first number is equal to the total number of the electrode sheets plus 1; The step S42 includes: controlling the first number to be incremented by 1 based on the electrode sheets with the first number and the third number being detached from the conductive film layer.

4. The heat treatment method for electrically heated glass according to claim 3, characterized in that: The step S41 further includes: Step S413, based on the power-off duration reaching a second preset duration and the third number being equal to the second number, controlling the electrode sheets of the first number and the third number to maintain a state of adhesion with the conductive film layer, and controlling the first number to be accumulated by 1.

5. The heat treatment method for electrically heated glass according to claim 1, characterized in that: The second number is equal to the total number of the electrode sheets.

6. The heat treatment method for electrically heated glass according to claim 1, characterized in that: The second number is equal to the first number plus 1.

7. An electrically heated glass heat treatment device, applied to the electrically heated glass heat treatment method according to any one of claims 1 to 6, characterized in that: The electrically heated glass heat treatment device comprises: A support assembly, the support assembly comprising a supporting unit and a lifting frame unit; the supporting unit comprising a support body and a plurality of supporting blocks; the supporting blocks are detachably connected to the support body, the lifting frame unit comprising a plurality of lifting parts; the lifting parts are vertically slidably connected to the support body; a plurality of the supporting blocks are arranged around the lifting frame unit; A heating component, the heating component comprises a plurality of electrode sheets; the electrode sheets are in the shape of long strips; the plurality of electrode sheets are arranged in sequence and at intervals; the lifting part is arranged in one-to-one correspondence with the electrode sheets; the electrode sheets are detachably connected to the lifting part.

8. The electrically heated glass heat treatment device according to claim 7, characterized in that: The electrically heated glass heat treatment device further comprises a pressurizing assembly, which comprises a pressurizing driving unit and a pressurizing head; the pressurizing driving unit drives the pressurizing head to rise and fall; the pressurizing head is located at the center of the plurality of support blocks.

9. The electrically heated glass heat treatment device according to claim 8, characterized in that: The pressure head is a suction cup.

10. The electrically heated glass heat treatment device according to claim 7, characterized in that: The lifting part includes a plurality of lifting elements; the plurality of lifting elements are arranged in sequence along the length of the electrode sheet; the lifting elements are vertically slidably connected to the bracket body; the electrode sheet is a flexible electrode sheet; the electrode sheet is detachably connected to the corresponding plurality of lifting elements.

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