An electric heating glass heat treatment method and device

Abstract

The present invention relates to the technical field of electrically heated glass, and in particular, to a heat treatment method and device for electrically heated glass. The heat treatment method for electrically heated glass includes steps S10 to S50. Steps S10 to S40 are, in sequence, obtaining a first number and a second number of electrode plates to be energized; controlling the electrode plates with the first number and the second number to be energized and making the current reach a preset current value, and accumulating the heating duration; controlling the electrode plates with the first number and the second number to be de-energized, and accumulating the de-energization duration; based on the de-energization duration reaching a second preset duration, controlling the first number to be incremented by 1. Step S50 is to repeat steps S20 to S40 until the first number reaches the total number of electrode plates, and the loop ends. Thereby, local heat treatment of the electrically heated glass is accurately performed through multiple electrode plates, so that a gradient change in sheet resistance is formed on the conductive film layer of the electrically heated glass, and further the uniformity of the surface heating power density of the electrically heated glass is improved.

Description

Technical Field

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

[0002] Electrically heated glass refers to glass with an electric heating function, which is usually applied to the windshields of transportation vehicles such as airplanes, trains, automobiles, and ships. Electrically heated glass generally includes a glass body and a conductive film, and the conductive film is transparent. By using the Joule heat generated after the conductive film of the electrically heated glass is energized, the functions of anti-icing and defogging can be achieved. The conductive film is usually an ITO (Indium Tin Oxide, abbreviated as ITO) film, which has good optoelectronic properties, and its resistivity is between that of a gold film and a 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 a required pattern, and then busbars are formed on both sides of the film and connected with wires, and then it can be used as a heating film. The surface temperature of the electrically heated glass needs to tend to be uniform to ensure safety. If the temperature difference on the electrically heated glass is large, it is easy to crack. For special-shaped electrically heated glass, it is more difficult to control the temperature uniformity. Therefore, a certain gradient change in the surface resistance of the special-shaped ITO film is required to make the ITO film have a uniform heating power density, so as to achieve the effect of uniform surface temperature of the electrically heated glass.

[0003] Most special-shaped electrically heated glasses use infrared heating lamps for heat treatment. By controlling the heating effects 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 perform heat treatment on the electrically heated glass, a certain distance needs to be maintained between the heating lamps and the ITO film, and the temperature radiated from the heating lamps to the electrically heated glass is not accurate enough. When multiple lamps are arranged densely, the heat radiation ranges of 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 leading to non-uniform heating power density on the surface of the electrically heated glass. Summary of the Invention

[0004] To solve the problem of low precision in local heat treatment of the 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, a heat treatment method for electrically heated glass provided by the present invention includes:

[0006] Step S10: Based on the completion of the positioning of the electrically heated glass in the vacuum chamber, obtain the first number and the second number of the electrode sheets to be energized; the electrically heated glass includes a glass layer and a conductive film layer; the glass layer and the conductive film layer are fixedly connected; in the state where the positioning of the electrically heated glass is completed, the conductive film layer is attached to several of the electrode sheets, and the electrically heated glass is located above the electrode sheets; several of the electrode sheets are arranged at intervals in sequence and are numbered in increasing order of positive integers; both the first number and the second number are positive integers; the first number is 1.

[0007] Step S20: Obtain the length dimension of the electrically heated glass corresponding to the position of the electrode sheet with the first number, control the electrode sheets with the first number and the second number to be energized and make the current reach the preset current value, and accumulate the heating duration; the length dimension of the electrically heated glass is the dimension along the length direction of the electrode sheet; the electrothermal power between the electrode sheets with the first number and the second number in the conductive film layer 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] where 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 duration reaching the first preset duration, control the electrode sheet with the first number and the electrode sheet with the second number to be de-energized, and accumulate the de-energization duration.

[0011] Step S40: Based on the de-energization duration reaching the second preset duration, control the first number to be incremented by 1.

[0012] Step S50: Repeat Step S20 to Step S40 until the first number reaches the total number of the electrode sheets, and end the loop.

[0013] In some embodiments, Step S40 includes:

[0014] Step S41: Based on the de-energization duration reaching the second preset duration, control 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, control the first number to be incremented by 1.

[0016] In some embodiments, Step S41 includes:

[0017] Step S411: Based on the power-off duration reaching the second preset duration, control the electrode sheet with the first number to descend until it disengages from the conductive film layer;

[0018] Step S412: Based on the power-off duration reaching the second preset duration and the difference between the third number and the second number being greater than 0, control the electrode sheet with the third number to descend until it disengages from the conductive film layer; the sum of the third number and the first number is equal to the total number of electrode sheets plus 1;

[0019] Step S42 includes: Based on the electrode sheets with the first number and the third number disengaging from the conductive film layer, control the first number to increment by 1.

[0020] In some embodiments, Step S41 further includes:

[0021] Step S413: Based on the power-off duration reaching the second preset duration and the third number being equal to the second number, control the electrode sheets with the first number and the third number to remain in a state of fitting with the conductive film layer, and control the first number to increment by 1.

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

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

[0024] In a second aspect, an electric heating glass heat treatment device provided by the present invention is applied to the electric heating glass heat treatment method in the first aspect. The electric heating glass heat treatment device includes:

[0025] A bracket assembly, the bracket assembly includes a supporting unit and a lifting frame unit; the supporting unit includes a bracket main body and a plurality of supporting blocks; the supporting blocks are detachably connected to the bracket main body, the lifting frame unit includes a plurality of lifting parts; the lifting parts are slidably connected to the bracket main body in the vertical direction; a plurality of the supporting blocks are arranged around the lifting frame unit;

[0026] A heating assembly, the heating assembly includes a plurality of electrode sheets; the electrode sheets are strip-shaped; a plurality of the electrode sheets are arranged at intervals in sequence; the lifting parts are arranged in one-to-one correspondence with the electrode sheets; the electrode sheets are detachably connected to the lifting parts.

[0027] In some embodiments, the electric heating glass heat treatment device further includes a pressurizing assembly, the pressurizing assembly includes a pressurizing drive unit and a pressurizing head; the pressurizing drive unit drives the pressurizing head to lift and lower; the pressurizing head is located at the center of a plurality of the supporting blocks.

[0028] In some embodiments, the pressurizing 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 slidably connected to the bracket body in the vertical direction; the electrode sheet is a flexible electrode sheet; the electrode sheet is detachably connected to the corresponding plurality of lifting elements.

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

[0031] By precisely annealing different regions of the conductive film layer through multiple electrode sheets, the resistance values of different regions of the conductive film layer can be accurately controlled, enabling precise variation of the sheet resistance of the conductive film layer in different regions, that is, forming a gradient change in the sheet resistance of the conductive film layer. Furthermore, the surface heating power density of the electrically heated glass is made uniform, achieving the purpose of reducing the surface temperature difference of the electrically heated glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Shows a flowchart of a method for heat-treating electrically heated glass according to an embodiment;

[0033] Figure 2 Shows a schematic structural diagram of an electrically heated glass according to an embodiment;

[0034] Figure 3 Shows a schematic structural diagram of an electrode sheet of a heat treatment device for electrically heated glass according to an embodiment;

[0035] Figure 4 Shows a schematic structural diagram of a heat treatment device for electrically heated glass according to an embodiment;

[0036] Figure 5 Shows a schematic structural diagram of a mounting component of a heat treatment device for electrically heated glass according to an embodiment;

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

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

[0039] Reference Numerals:

[0040] 10, electrically heated glass; 11, glass layer; 12, conductive film layer; 20, electrode sheet; 21, copper foam layer; 22, copper foil layer; 30, bracket assembly; 31, supporting unit; 311, bracket body; 312, supporting block; 32, lifting frame unit; 40, mounting component; 41, mounting frame; 42, supporting block; 43, receiving groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The present disclosure will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are described only to enable those of ordinary skill in the art to better understand and thus implement the present disclosure, and do not imply any limitation on the scope of the present disclosure.

[0042] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment". The term "another embodiment" is to be construed as "at least one other embodiment". The orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. are based on the orientations or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. Also, in addition to being able to represent orientations or positional relationships, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific circumstances. In addition, the terms "mounted", "arranged", "provided with", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to 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 do not indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0043] The special-shaped electric heating glass 10 applied to the windshield of automobiles, ships, airplanes, trains, etc. mostly uses infrared heating tubes for heat treatment. By controlling the heating effect of different areas on the electric heating glass 10 through multiple heating tubes, different resistance values can be achieved in different areas. However, when using the heating tubes to heat-treat the electric heating glass 10, the heat of the heating tubes is concentrated near the heating tubes themselves. Therefore, in order to ensure a certain temperature uniformity, a certain distance needs to be maintained between the heating tubes and the ITO film. Even so, the temperature uniformity is difficult to control well. Moreover, the heating tubes rely on radiation to transfer heat, and the temperature radiated onto the electric heating glass 10 is not precise enough. When multiple tubes are arranged densely, the heat radiation ranges of adjacent heating tubes on the electric heating glass 10 will overlap. Therefore, due to the uneven heat of the electric heating tubes, the inaccurate temperature radiated onto the electric heating glass 10, and the overlap of the heat radiation ranges between adjacent electric heating tubes, it is not easy to efficiently and accurately control the local heat treatment effect of the electric heating glass 10. For this reason, in order to accurately perform local heat treatment on the electric heating glass, improve the accuracy of the resistance gradient of the conductive film, and achieve better uniformity of the surface heating power density of the electric heating glass, the present invention provides a method and device for heat-treating the electric heating glass 10.

[0044] In this embodiment, with reference to Figure 1 、 Figure 2 and Figure 3 , in a first aspect, a method for heat-treating the electric heating glass 10 is provided, including the following steps S10 to S50.

[0045] Step S10, after the electric heating glass 10 is positioned in the vacuum chamber, obtain the first number and the second number of the electrode sheets 20 to be energized. The electric heating 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 deposited on the surface of the glass layer 11 by magnetron sputtering. In the state where the electric heating glass 10 is positioned in the vacuum chamber, the conductive film layer 12 is attached to a plurality of electrode sheets 20, and the electric heating glass 10 is located above the electrode sheets 20. The vacuum degree in the vacuum chamber can be lower than 6.0×10 -4Pa is used to avoid the reaction between the conductive film layer 12 and oxygen as much as possible, which may affect the resistance value of the conductive film layer 12. Specifically, the electric heating glass 10 can be pressed tightly on several electrode plates 20 by its own weight to achieve a good fitting state between the two. The electrode plate 20 can include a foam copper layer 21 and two copper foil layers 22, and the foam copper layer 21 is attached between the two copper foil layers 22. Power is supplied to any two electrode plates 20 to generate a potential difference between the two electrode plates 20, so that a current can be generated on the conductive film layer 12 between the two electrode plates 20, and then Joule heat is generated to realize the annealing treatment of the electric heating glass 10. Several electrode plates 20 are arranged at intervals in sequence and numbered in ascending order of positive integers. Both the first number and the second number are positive integers. In step S10, the first number is 1, that is, the initial value of the first number is 1.

[0046] Step S20: Obtain the length dimension of the electric heating glass 10 corresponding to the position of the electrode plate 20 with the first number, control the electrode plates 20 with the first number and the second number to be energized and make the current reach the preset current value, and accumulate the heating duration. The length dimension of the electric heating glass 10 is the dimension along the length direction of the electrode plate 20. The electrothermal power of the conductive film layer 12 between the electrode plates 20 with the first number and the second number is negatively correlated with the length dimension of the electric heating glass 10. The preset current value is related to the following formula:

[0047] P = I 2 R;

[0048] where P is the electrothermal power, I is the preset current value, and R is the resistance value of the conductive film layer 12 between the electrode plates 20 with the first number and the second number. It should be understood that in the area where the length dimension of the electric heating glass 10 is larger, R is smaller. It should be understood that when the heat treatment duration is certain, the larger the electrothermal power, the smaller the resistance value of the conductive film layer 12 after heat treatment. Since the electric heating glass 10 can be of various shapes, for the special-shaped electric heating glass 10, heat is likely to concentrate in the area with a shorter length, and the heat is more dispersed in the area with a longer length. 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, reducing the temperature difference between different areas on the surface of the electric heating glass 10, thus ensuring the safety of the electric heating glass 10 during use.

[0049] Step S30: Based on the heating duration reaching the first preset duration, control the electrode plate 20 with the first number and the electrode plate 20 with the second number to be powered off, and accumulate the power-off duration. The first preset duration can be determined according to the specific shape and size of the electric heating glass 10.

[0050] Step S40: Based on the power-off duration reaching the second preset duration, control the first number to increment by 1. The second preset duration can be determined according to the specific shape and size of the electrothermal glass 10. By generating heat through the resistance of the conductive film itself for heat treatment of itself, the temperature and the heat treatment range of the heat treatment can be accurately controlled. Further, by controlling the power-off duration to reach the second preset duration, the mutual influence between adjacent two heating regions can be further reduced.

[0051] Step S50: Repeat Step S20 to Step S40 until the first number reaches the total number of the electrode plates 20, end the loop, and complete the heat treatment of the electrothermal glass 10.

[0052] In some other embodiments, the electrothermal glass 10 is trapezoidal, the lengths of several electrode plates 20 are equal, and the resistance values of the conductive film layer 12 between each group of adjacent electrode plates 20 are equal. At this time, when performing heat treatment on the shorter top of the electrothermal glass 10 in terms of length dimension, the preset current value should be larger; when performing heat treatment on the longer bottom of the electrothermal glass 10 in terms of length dimension, the preset current value should be smaller.

[0053] In some other embodiments, the electrothermal glass 10 is trapezoidal. As the number of several electrode plates 20 gradually increases, their lengths also gradually increase. It should be understood that when the two bottom angles of the trapezoid of the electrothermal glass 10 are smaller, when performing heat treatment on the shorter top of the electrothermal glass 10 in terms of length dimension, the preset current value can be smaller; when performing heat treatment on the longer bottom of the electrothermal glass 10 in terms of length dimension, the preset current value can be larger. The specific numerical setting of the preset current value needs to be determined according to the specific shape and size of the electrothermal glass 10 and the length of the electrode plates 20, and finally it is sufficient to satisfy that the electrothermal power between the electrode plates 20 with the first number and the second number of the conductive film layer 12 is negatively correlated with the length dimension of the electrothermal glass 10. That is, in the region where the length dimension of the electrothermal glass 10 is larger, the electrothermal power during the heat treatment process needs to be smaller.

[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, control the electrode plate 20 with the first number to descend to disengage from the conductive film layer 12. By controlling the electrode plate 20 with the first number to disengage from the conductive film layer 12, the influence of the heat carried by the electrode plate 20 that has been electrified on the subsequent heat treatment steps of the electrothermal glass 10 can be further reduced.

[0056] Step S42: Based on the electrode sheet 20 with the first number being detached from the conductive film layer 12, control the first number to increment by 1. Specifically, after the electrode sheet 20 with the first number being 1 is electrified, lower the electrode sheet 20 numbered 1, and then electrify the electrode sheet 20 numbered 2 and the electrode sheet 20 with the second number. The second number can be set to a corresponding value according to actual requirements.

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

[0058] Step S411: Based on the power-off duration reaching the second preset duration, control the electrode sheet 20 with the first number to descend until it detaches 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 being greater than 0, control the electrode sheet 20 with the third number to descend until it detaches 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 and the electrode sheet 20 with the first number are symmetrically arranged about the center of the electrothermal glass 10. Since the supporting effect at the bottom of the electrothermal glass 10 changes after the electrode sheet 20 with the first number descends, in order to make the supporting structure of the electrothermal glass 10 symmetric and avoid the electrothermal glass 10 from tilting and deforming. Therefore, lowering the electrode sheets 20 at the symmetric positions at both ends of the electrothermal glass 10 can improve the symmetry of the supporting effect and the stability of the electrothermal glass 10.

[0060] Step S42 includes: Based on the electrode sheets 20 with the first number and the third number being detached from the conductive film layer 12, control the first number to increment by 1.

[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, control the electrode sheets 20 with the first number and the third number to remain in contact with the conductive film layer 12, and control the first number to increment 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 be electrified for heat treatment, the electrode sheet 20 with the second number needs to remain in contact with the conductive film layer 12. Therefore, at this time, it is not necessary to lower the electrode sheets 20 with the first number and the third number to ensure the smooth progress of the heat treatment process.

[0063] In this embodiment, the second number is equal to the total number of the 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 two end positions of the electro-heating glass 10. The second number is a fixed value. Specifically, when the total number of the electrode sheets 20 is 5, first, the electrode sheets 20 numbered 1 and 5 are energized for a first preset duration and then de-energized, then the electrode sheets 20 numbered 2 and 5 are energized for a first preset duration and then de-energized, then the electrode sheets 20 numbered 3 and 5 are energized for a first preset duration and then de-energized, and finally the electrode sheets 20 numbered 4 and 5 are energized for a first preset duration and then de-energized, thus completing the heat treatment of the electro-heating glass 10. It should be understood that in this embodiment, the change of the preset current value during each energization can remain unchanged, or increase or decrease sequentially, which specifically needs to be determined according to the specific shape of the electro-heating 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. Thus, the second number changes with the change of the first number. Specifically, when the total number of the electrode sheets 20 is 5, first, the electrode sheets 20 numbered 1 and 2 are energized for a first preset duration and then de-energized, then the electrode sheets 20 numbered 2 and 3 are energized for a first preset duration and then de-energized, then the electrode sheets 20 numbered 3 and 4 are energized for a first preset duration and then de-energized, and finally the electrode sheets 20 numbered 4 and 5 are energized for a first preset duration and then de-energized, thus completing the heat treatment of the electro-heating glass 10. Specifically, taking the shape of the electro-heating glass 10 as a trapezoid as an example, referring to Figure 6 , when the lengths of several electrode sheets 20 are equal, since the resistance values during each energization are equal, the preset current value should gradually decrease. Referring to Figure 7 , when the lengths of several electrode sheets 20 are greater than the maximum length dimension of the electro-heating glass 10, the fitting dimension between the electrode sheet 20 and the electro-heating glass 10 is equal to the length dimension of the electro-heating glass 10 at the position corresponding to the electrode sheet 20. Figure 7 The electrode sheet 20 shown in

[0065] refers to the fitting dimension between the electrode sheet 20 and the electro-heating glass 10. That is, the heat treatment area during each energization is also trapezoidal, 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 trapezoidal base angle size of the electro-heating glass 10.

[0065] In this embodiment, referring to Figure 2 and Figure 4 , in the second aspect, an electro-heating glass 10 heat treatment device is provided, which is applied to the electro-heating glass 10 heat treatment method in the first aspect. The electro-heating glass 10 heat treatment device includes a bracket assembly 30 and a heating assembly.

[0066] The bracket assembly 30 includes a supporting unit 31 and a lifting frame unit 32. The supporting unit 31 includes a bracket main body 311 and a plurality of supporting blocks 312, and the supporting blocks 312 are detachably connected to the bracket main body 311. The lifting frame unit 32 includes a plurality of lifting parts, and the lifting parts are slidably connected to the bracket main body 311 in the vertical direction. The plurality of supporting blocks 312 are arranged around the lifting frame unit 32. The electric heating glass 10 is placed on the plurality of supporting blocks 312, so that the supporting blocks 312 are distributed at the edge positions of the electric heating glass 10.

[0067] The heating assembly includes a plurality of electrode plates 20. The electrode plates 20 are strip-shaped. The plurality of electrode plates 20 are arranged at intervals in sequence and are parallel to each other. The lifting parts are arranged in one-to-one correspondence with the electrode plates 20, and the electrode plates 20 are detachably connected to the lifting parts. The height of the electrode plates 20 can be adjusted through the lifting parts to improve the fitting degree between the electrode plates 20 and the conductive film layer 12 of the electric heating glass 10. The lifting parts can adopt driving modes such as servo motors or cylinders.

[0068] Thus, through the mutual cooperation of the bracket assembly 30 and the heating assembly, the electric heating glass 10 can be subjected to zoning heat treatment by using the plurality of electrode plates 20, so as to realize the precise continuous change of the surface resistance of the conductive film layer 12 in different regions. Furthermore, the surface heating power density of the electric heating glass 10 is made uniform, so as to achieve the purpose of reducing the surface temperature difference of the electric heating glass 10.

[0069] In this embodiment, the electric heating glass 10 heat treatment device further includes a pressing assembly. The pressing assembly includes a pressing driving unit and a pressing head. The pressing head is located above the electric heating glass 10, and the pressing driving unit drives the pressing head to lift, so that the pressing head can be pressed against the upper surface of the electric heating glass 10. The pressing head is located at the center of the plurality of supporting blocks 312. Thus, the pressing head applies a pressing force to the center of the electric heating glass 10, improving the pressing stability of the pressing head on the electric heating glass 10.

[0070] In some other embodiments, the pressing heads can be provided in plurality. The plurality of pressing heads do not need to be concentrated at the center of the electric heating glass 10. The plurality of pressing heads can be dispersed above the electric heating glass 10, so as to realize pressing on different positions of the electric heating glass 10 and further improve the pressing stability. In the case where the electric heating glass 10 is curved, the plurality of pressing heads can greatly improve the fitting effect between the electric heating glass 10 and the plurality of electrode plates 20.

[0071] In this embodiment, the pressing head is a suction cup. Through the suction cup, a good pressing effect can be produced on the electric heating glass 10 and the electric heating glass 10 is not easily damaged.

[0072] In this embodiment, the lifting part includes a plurality of lifting elements, and the plurality of lifting elements are arranged in sequence along the length of the electrode sheet 20. The lifting elements are slidably connected to the bracket body 311 in the vertical direction. The electrode sheet 20 is a flexible electrode sheet 20, and the electrode sheet 20 is detachably connected to the corresponding plurality of lifting elements. The use of the flexible electrode sheet 20 enables the electrode sheet 20 to better adapt to the curved electric heating glass 10.

[0073] In other embodiments, referring to Figure 2 , Figure 4 and Figure 5 , in order to adapt to electric heating glasses 10 of different shapes, the electric heating glass 10 heat treatment device further includes a mounting assembly 40. The mounting assembly 40 includes a mounting frame 41 and a support block 42. A receiving groove 43 adapted to the shape of the electric heating glass 10 is formed in the mounting frame 41. A plurality of support blocks 42 are provided. 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. Thus, when the mounting frame 41 is placed on a plurality of supporting blocks 312, the electric heating glass 10 can be placed in the receiving groove 43, so that the plurality of support blocks 42 can support the lower edge of the electric heating glass 10. Thus, by replacing different mounting assemblies 40, reliable positioning of electric heating glasses 10 of different shapes can be achieved.

[0074] Those of ordinary skill in the art can understand that the above embodiments are specific cases for implementing the present disclosure, and in practical applications, various changes can be made to them in form and details without departing from the scope of the present disclosure.

Claims

1. An electro-heated glass heat treatment method, characterized in that, the electro-heated glass heat treatment method includes: Step S10, after the electro-heated glass is positioned in the vacuum chamber, obtain the first number and the second number of the electrode sheets to be energized; the electro-heated glass includes a glass layer and a conductive film layer; the glass layer and the conductive film layer are fixedly connected; in the state where the electro-heated glass is positioned, the conductive film layer is attached to several of the electrode sheets, and the electro-heated glass is located above the electrode sheets; several of the electrode sheets are arranged at intervals in sequence and are numbered in increasing positive integers in sequence; both the first number and the second number are positive integers; the first number is 1; Step S20, obtain the length dimension of the electro-heated glass corresponding to the position of the electrode sheet with the first number, control the electrode sheets with the first number and the second number to be energized and make the current reach a preset current value, and accumulate the heating duration; the length dimension of the electro-heated glass is the dimension along the length direction of the electrode sheet; the electro-thermal power between the electrode sheets with the first number and the second number of the conductive film layer is negatively correlated with the length dimension of the electro-heated glass; the preset current value is related to the following formula: P = I 2 R; where P is the electro-thermal 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 duration reaching a first preset duration, control the electrode sheet with the first number and the electrode sheet with the second number to be powered off, and accumulate the power-off duration; Step S40, based on the power-off duration reaching a second preset duration, control the first number to be incremented by 1; Step S50, repeat Step S20 to Step S40 until the first number reaches the total number of the electrode sheets, and end the loop.

2. The electro-heated glass heat treatment method according to claim 1, characterized in that, Step S40 includes: Step S41, based on the power-off duration reaching a second preset duration, control the electrode sheet with the first number to descend to disengage from the conductive film layer; Step S42, based on the electrode sheet with the first number disengaging from the conductive film layer, control the first number to be incremented by 1.

3. The electro-heated glass heat treatment method according to claim 2, characterized in that, Step S41 includes: Step S411, based on the power-off duration reaching a second preset duration, control the electrode sheet with the first number to descend to disengage 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, control the electrode sheet with the third number to descend to disengage 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; Step S42 includes: based on the electrode sheets with the first number and the third number disengaging from the conductive film layer, control the first number to be incremented by 1.

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

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

6. The method for heat treatment of an electrically heated glass according to claim 1, wherein the second number is equal to the first number plus 1.

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