Laser welding equipment

Abstract

The utility model discloses laser welding equipment which comprises a laser welding device, and the laser welding device comprises a welding workbench, a laser welding head and a laser welding head, a clamping mechanism; a welding moving mechanism; the laser welding mechanism comprises a laser welding head and a height detection structure, the laser welding head is used for generating laser beams downwards, and the height detection structure is used for detecting the height distance between the laser welding head and the upper surface of the upper piece of glass; wherein the welding moving mechanism can drive the laser welding mechanism to move above to-be-welded positions of the upper glass and the lower glass and adjust the upper surfaces of the laser welding mechanism and the upper glass according to the height distance between the position of a welding focus focused by a laser beam and a laser welding head and the thickness of the upper glass at the to-be-welded position and the height interval is equal to the welding height interval. The position of a welding focus is adjusted based on the thickness of the upper glass at the position to be welded, it is ensured that the position of the welding focus meets the requirement, and then it is ensured that the welding strength meets the requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to glass manufacturing technical field, especially, relate to a kind of laser welding equipment. BACKGROUND

[0002] Glass material is a kind of unique performance non-metallic material, and its processing product has important application in sensor, photonic device, biochip and other high-tech fields, and laser processing technology, especially ultrafast laser technology provides a kind of high-quality, high-efficiency and clean and pollution-free processing method for glass material welding, which can be applied to the manufacture of vacuum glass, hollow glass, multilayer glass and other glasses.

[0003] Among them, laser welding between glass and glass adopts ultra-short pulse laser, focuses high repetition frequency ultra-short pulse laser between two pieces of glass using objective lens, makes plasma generate between two pieces of glass and re-solidifies, to realize the welding connection of two pieces of glass. UTILITY MODEL CONTENT

[0004] The inventor of the utility model finds that: because there is thickness difference range of plate glass, i.e. the allowable difference between actual thickness and nominal thickness, for example, the thickness difference range of flat plate glass with nominal thickness of 2mm-8mm is ±100 μm-±200 μm, when two pieces of glass are laser welded, the welding focus cannot be always at the joint of two pieces of glass due to the thickness difference of glass, leading to a substantial reduction in welding strength.

[0005] The utility model aims to provide a kind of laser welding equipment, to solve the technical problem that welding focus cannot be always at the joint of two pieces of glass due to the thickness difference of glass at present, leading to a substantial reduction in welding strength.

[0006] The above-mentioned purpose of the utility model can be realized by using the following technical solutions:

[0007] The utility model provides a kind of laser welding equipment, including laser welding device, the laser welding device includes: welding workstation;Clamping mechanism, installation in the welding workstation, the clamping mechanism is used to be fixed in the welding workstation with the laminated upper glass and lower glass tightness;Welding moving mechanism;Laser welding mechanism, installation in the welding moving mechanism and be located above the welding workstation, the laser welding mechanism includes laser welding head and height detection structure, the laser welding head is used to downward laser beam, the height detection structure is used to detect the height interval between the laser welding head and the upper surface of the upper glass;Wherein, the welding moving mechanism can drive the laser welding mechanism moves to the upper glass and the lower glass above the position to be welded of the laser welding mechanism and according to the height interval between the position of laser beam focus welding focal point and the laser welding head and the thickness of the upper glass at the position to be welded Adjust the height interval between the laser welding mechanism and the upper surface of the upper glass to welding height interval.

[0008] In the embodiment of the utility model, the welding height interval is h, the height interval between the position of laser beam focus welding focal point and the laser welding head is H, and the thickness of the upper glass at the position to be welded is t, with the relationship: h=H-t.

[0009] In the embodiment of the utility model, the laser welding equipment further includes a data storage mechanism, the data storage mechanism is used to store the thickness of the upper glass at the position to be welded, and the data storage mechanism is in communication connection with the welding moving mechanism.

[0010] In the embodiment of the utility model, the laser welding equipment further includes a thickness detection device, and the thickness detection device includes: a thickness detection table, a detection moving mechanism installed on the thickness detection table, and a thickness detection mechanism installed on the detection moving mechanism and above the thickness detection table.

[0011] In the embodiment of the utility model, the data storage mechanism is in communication connection with the thickness detection mechanism, and the thickness detection mechanism can transmit and store the thickness of the upper glass at the position to be welded to the data storage mechanism.

[0012] The utility model discloses an embodiment of the utility model discloses a two -dimensional code identification structure is arranged on the upper piece glass, and the thickness detection device still includes the first scanning reading mechanism for scanning reading two -dimensional code identification structure, and the laser welding device still includes the second scanning reading mechanism for scanning reading two -dimensional code identification structure, and data storage mechanism is connected with first scanning reading mechanism and second scanning reading mechanism communication respectively.

[0013] The utility model discloses an embodiment of the utility model discloses the upper piece glass and lower piece glass all have opposite two first side edge parts and opposite two second side edge parts, and the welding mobile mechanism includes first horizontal movement structure, second horizontal movement structure and first elevating system, first horizontal movement structure is movably arranged along the extension direction of first side edge part, second horizontal movement structure is movably arranged along the extension direction of second side edge part, and first elevating system is movably arranged along the height direction, the welding workstation is installed in first horizontal movement structure, second horizontal movement structure is set up in the upper of welding workstation, first elevating system is installed in second horizontal movement structure, and laser welding mechanism is installed in first elevating system.

[0014] The utility model discloses an embodiment of the utility model discloses the height detection structure includes laser height detection head.

[0015] The utility model discloses an embodiment of the utility model discloses that laser welding mechanism still includes laser gap detection head, and laser gap detection head is used to detect the gap between upper piece glass and lower piece glass at the position of waiting to be welded.

[0016] The utility model discloses an embodiment of the utility model discloses that lower piece glass is equipped with the air extraction, and the air extraction is linked together with the gap space between upper piece glass and lower piece glass, and laser welding device still includes the vacuumization mechanism, and the welding workstation is equipped with the air extraction channel, and the vacuumization mechanism is linked together with air extraction through air extraction channel.

[0017] The utility model discloses an embodiment of the utility model discloses the characteristics and advantages are:

[0018] The utility model discloses an embodiment of the utility model discloses that the laser welding equipment is through setting up height detection structure on laser welding mechanism to detect the height interval between laser welding head and the upper surface of upper piece glass, makes welding mobile mechanism can according to the height interval between the position of laser beam focus welding focal point and laser welding head and the thickness adjustment height interval between laser welding head and the upper surface of upper piece glass to the welding height interval at the position of waiting to be welded of upper piece glass at the position of waiting to be welded, thereby realizes the position adjustment of welding focal point, ensures that the position of welding focal point meets the requirement, and then ensures that the welding strength of upper piece glass and lower piece glass meets the requirement. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 The figure is a structural schematic diagram of the laser welding device of the present application.

[0021] Figure 2 The figure is a structural schematic diagram of the laser welding device in the present application.

[0022] Figure 3 The figure is a structural schematic diagram of the laser welding mechanism in the present application.

[0023] Figure 4 The figure is a structural schematic diagram of the upper glass and the lower glass in the present application.

[0024] Figure 5 The figure is a structural schematic diagram of the laser welding device in the present application.

[0025] Figure 6 The figure is a thickness data distribution diagram of the upper glass at each welding position in an embodiment of the present application.

[0026] Figure 7 The figure is a welding flow chart of the laser welding device of the present application.

[0027] Figure 8 The figure is a height change curve diagram of the laser height detection head in the comparative example.

[0028] Figure 9 The figure is a height change curve diagram of the laser welding head in the preferred embodiment.

[0029] Figure 10 The figure is a distribution schematic diagram of five welding paths of the upper glass and the lower glass in the welding test.

[0030] Figure 11 The figure is a welding section comparison diagram of the comparative example and the preferred embodiment of the upper glass and the lower glass at the welding path A-A.

[0031] Figure 12 The figure is a welding section comparison diagram of the comparative example and the preferred embodiment of the upper glass and the lower glass at the welding path B-B.

[0032] Figure 13 The figure is a welding section comparison diagram of the comparative example and the preferred embodiment of the upper glass and the lower glass at the welding path C-C.

[0033] Figure 14 FIG. 8 is a comparison diagram of the welding section of the upper glass and the lower glass of the comparative example and the preferred embodiment at the welding path D-D.

[0034] Figure 15 FIG. 9 is a comparison diagram of the welding section of the upper glass and the lower glass of the comparative example and the preferred embodiment at the welding path E-E.

[0035] In the figure:

[0036] 1. Laser welding device; 11. Welding workbench; 111. Air extraction channel; 12. Clamping mechanism; 121. Pressing tool; 13. Welding moving mechanism; 131. First horizontal moving structure; 132. Second horizontal moving structure; 133. First lifting structure; 14. Laser welding mechanism; 141. Laser welding head; 142. Height detection structure; 143. Laser gap detection head;

[0037] 2. Thickness detection device; 21. Thickness detection table; 22. Detection moving mechanism; 221. Third horizontal moving structure; 222. Fourth horizontal moving structure; 223. Second lifting structure; 23. Thickness detection mechanism;

[0038] 3. Upper glass;

[0039] 4. Lower glass; 41. Air extraction port;

[0040] 5. Clamping area;

[0041] 6. Welding area;

[0042] 7. Welding fusion structure;

[0043] 8. Welding seam. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0045] As Figures 1 to 4The utility model provides a kind of laser welding equipment, including laser welding device 1, laser welding device 1 includes: welding workbench 11;Clamping mechanism 12, installation is in welding workbench 11, clamping mechanism 12 is used to be fixed in welding workbench 11 with the layering upper piece glass 3 and lower piece glass 4 tight;Welding moving mechanism 13;Laser welding mechanism 14, installation is in welding moving mechanism 13 and located above welding workbench 11, laser welding mechanism 14 includes laser welding head 141 and height detection structure 142, laser welding head 141 is used to generate laser beam downward, height detection structure 142 is used to detect the height interval between laser welding head 141 and the upper surface of upper piece glass 3;Wherein, welding moving mechanism 13 can drive laser welding mechanism 14 to move to the above of upper piece glass 3 and lower piece glass 4 to be welded position and according to the height interval H between the position of laser beam focus welding focal point O and laser welding head 141 and the thickness t of upper piece glass 3 at to be welded position Height interval between laser welding head 141 and the upper surface of upper piece glass 3 is adjusted to welding height interval h.

[0046] The laser welding equipment of the utility model, by setting height detection structure 142 on laser welding mechanism 14 to detect the height interval between laser welding head 141 and the upper surface of upper piece glass 3, so that welding moving mechanism 13 can adjust the height interval between laser welding head 141 and the upper surface of upper piece glass 3 to welding height interval h according to the height interval H between the position of laser beam focus welding focal point O and laser welding head 141 and the thickness t of upper piece glass 3 at to be welded position, to realize the position adjustment of welding focal point O, ensure that the position of welding focal point O meets the requirements, and further ensure that the welding strength of upper piece glass 3 and lower piece glass 4 meets the requirements.

[0047] Specifically, the contour shape and contour size of upper piece glass 3 and lower piece glass 4 are similar, which can be rectangular, trapezoidal, triangular, circular or other regular shapes, and can also be irregular shapes. Upper piece glass 3 and lower piece glass 4 can be one of chemical toughened glass, physical toughened glass and untoughened glass, or a combination of any two. The thickness of upper piece glass 3 and the thickness of lower piece glass 4 can be the same or different, and the thickness range is preferably 4mm to 12mm.

[0048] As Figure 4As shown in the embodiment of the utility model, the upper glass 3 and the lower glass 4 have two opposite first side edge portions and two opposite second side edge portions, and the two first side edge portions of the upper glass 3 overlap the two first side edge portions of the lower glass 4, and the two second side edge portions of the upper glass 3 overlap the two second side edge portions of the lower glass 4. The first side edge portion and the second side edge portion of the upper glass 3 and the lower glass 4 both have a clamping area 5 for being pressed by the clamping mechanism 12 and a welding area 6 for welding; the welding area 6 is located in the inner periphery of the clamping area 5; the welding position of the upper glass 3 and the lower glass 4 is located in the welding area 6, preferably in the center of the welding area 6, and of course a certain deviation is also allowed. A plurality of welding positions are arranged on the circumference of the upper glass 3 and the lower glass 4 at intervals. The interval of the plurality of welding positions can be set according to the processing requirements, and optionally, the interval of the plurality of welding positions ranges from 5 mm to 40 mm, preferably 10 mm, that is, welding is performed at one point every 10 mm.

[0049] As Figure 1 and Figure 2 As shown in the embodiment of the utility model, the welding moving mechanism 13 comprises a first horizontal moving structure 131, a second horizontal moving structure 132 and a first lifting structure 133, the first horizontal moving structure 131 is movably arranged along the extension direction of the first side edge portion, the second horizontal moving structure 132 is movably arranged along the extension direction of the second side edge portion, and the first lifting structure 133 is movably arranged along the height direction; the welding workbench 11 is installed on the first horizontal moving structure 131, the second horizontal moving structure 132 is arranged above the welding workbench 11, the first lifting structure 133 is installed on the second horizontal moving structure 132, and the laser welding mechanism 14 is installed on the first lifting structure 133. The specific structure of the first horizontal moving structure 131, the second horizontal moving structure 132 and the first lifting structure 133 can be the same as that of the linear motion structure of the prior art, and will not be described in detail here.

[0050] As Figure 4 As shown in the embodiment of the utility model, the laser welding device can be applied to the manufacturing of vacuum glass, the lower glass 4 is provided with an air exhaust port 41, the air exhaust port 41 is in communication with the gap space between the upper glass 3 and the lower glass 4; the laser welding device 1 further comprises a vacuumizing mechanism, and the welding workbench 11 is provided with an air exhaust channel 111, and the vacuumizing mechanism is in communication with the air exhaust port 41 through the air exhaust channel 111. Before welding, the gap space between the upper glass 3 and the lower glass 4 can be vacuumized and vacuum adsorbed by the vacuumizing mechanism, and the clamping mechanism 12 is pressed to make the edge portions of the upper glass 3 and the lower glass 4 correspondingly adhere more closely.

[0051] As Figure 3As shown in the embodiment of the utility model, the laser welding mechanism 14 further comprises a laser gap detection head 143, which is used for detecting the gap between the upper glass sheet 3 and the lower glass sheet 4 at the position to be welded. Before welding, the pressing degree of the clamping mechanism 12 is adjusted according to the gap at the position to be welded, so as to ensure that the gap at the position to be welded meets the processing requirements. In this embodiment, the gap at the position to be welded can be less than or equal to 1 μm. Specifically, the clamping mechanism 12 comprises a plurality of pressing tools 121 arranged along the circumferences of the upper glass sheet 3 and the lower glass sheet 4. The pressing tools 121 can be pneumatic pressing tools, and the pressing degree can be adjusted by adjusting the air pressure. The specific structure of the clamping mechanism 12 and the specific adjustment method of adjusting the pressing degree of the clamping mechanism 12 according to the gap at the position to be welded can refer to the prior art, which will not be described in detail here.

[0052] As shown in the embodiment of the utility model, the laser welding mechanism 14 further comprises a laser gap detection head 143, which is used for detecting the gap between the upper glass sheet 3 and the lower glass sheet 4 at the position to be welded. Before welding, the pressing degree of the clamping mechanism 12 is adjusted according to the gap at the position to be welded, so as to ensure that the gap at the position to be welded meets the processing requirements. In this embodiment, the gap at the position to be welded can be less than or equal to 1 μm. Specifically, the clamping mechanism 12 comprises a plurality of pressing tools 121 arranged along the circumferences of the upper glass sheet 3 and the lower glass sheet 4. The pressing tools 121 can be pneumatic pressing tools, and the pressing degree can be adjusted by adjusting the air pressure. The specific structure of the clamping mechanism 12 and the specific adjustment method of adjusting the pressing degree of the clamping mechanism 12 according to the gap at the position to be welded can refer to the prior art, which will not be described in detail here. Figure 4 As shown in the embodiment of the utility model, the laser welding mechanism 14 further comprises a laser gap detection head 143, which is used for detecting the gap between the upper glass sheet 3 and the lower glass sheet 4 at the position to be welded. Before welding, the pressing degree of the clamping mechanism 12 is adjusted according to the gap at the position to be welded, so as to ensure that the gap at the position to be welded meets the processing requirements. In this embodiment, the gap at the position to be welded can be less than or equal to 1 μm. Specifically, the clamping mechanism 12 comprises a plurality of pressing tools 121 arranged along the circumferences of the upper glass sheet 3 and the lower glass sheet 4. The pressing tools 121 can be pneumatic pressing tools, and the pressing degree can be adjusted by adjusting the air pressure. The specific structure of the clamping mechanism 12 and the specific adjustment method of adjusting the pressing degree of the clamping mechanism 12 according to the gap at the position to be welded can refer to the prior art, which will not be described in detail here.

[0053] As shown in the embodiment of the utility model, the laser welding mechanism 14 further comprises a laser gap detection head 143, which is used for detecting the gap between the upper glass sheet 3 and the lower glass sheet 4 at the position to be welded. Before welding, the pressing degree of the clamping mechanism 12 is adjusted according to the gap at the position to be welded, so as to ensure that the gap at the position to be welded meets the processing requirements. In this embodiment, the gap at the position to be welded can be less than or equal to 1 μm. Specifically, the clamping mechanism 12 comprises a plurality of pressing tools 121 arranged along the circumferences of the upper glass sheet 3 and the lower glass sheet 4. The pressing tools 121 can be pneumatic pressing tools, and the pressing degree can be adjusted by adjusting the air pressure. The specific structure of the clamping mechanism 12 and the specific adjustment method of adjusting the pressing degree of the clamping mechanism 12 according to the gap at the position to be welded can refer to the prior art, which will not be described in detail here.

[0054] As shown in the embodiment of the utility model, the laser welding mechanism 14 further comprises a laser gap detection head 143, which is used for detecting the gap between the upper glass sheet 3 and the lower glass sheet 4 at the position to be welded. Before welding, the pressing degree of the clamping mechanism 12 is adjusted according to the gap at the position to be welded, so as to ensure that the gap at the position to be welded meets the processing requirements. In this embodiment, the gap at the position to be welded can be less than or equal to 1 μm. Specifically, the clamping mechanism 12 comprises a plurality of pressing tools 121 arranged along the circumferences of the upper glass sheet 3 and the lower glass sheet 4. The pressing tools 121 can be pneumatic pressing tools, and the pressing degree can be adjusted by adjusting the air pressure. The specific structure of the clamping mechanism 12 and the specific adjustment method of adjusting the pressing degree of the clamping mechanism 12 according to the gap at the position to be welded can refer to the prior art, which will not be described in detail here. Figure 4 As shown in the embodiment of the utility model, the laser welding mechanism 14 further comprises a laser gap detection head 143, which is used for detecting the gap between the upper glass sheet 3 and the lower glass sheet 4 at the position to be welded. Before welding, the pressing degree of the clamping mechanism 12 is adjusted according to the gap at the position to be welded, so as to ensure that the gap at the position to be welded meets the processing requirements. In this embodiment, the gap at the position to be welded can be less than or equal to 1 μm. Specifically, the clamping mechanism 12 comprises a plurality of pressing tools 121 arranged along the circumferences of the upper glass sheet 3 and the lower glass sheet 4. The pressing tools 121 can be pneumatic pressing tools, and the pressing degree can be adjusted by adjusting the air pressure. The specific structure of the clamping mechanism 12 and the specific adjustment method of adjusting the pressing degree of the clamping mechanism 12 according to the gap at the position to be welded can refer to the prior art, which will not be described in detail here. Figure 6As shown, in one embodiment of this utility model, an X-axis is set along the extending direction of the first side edge of the upper glass 3. The length of the first side edge of the upper glass 3 is 1000mm, the length of the second side edge of the upper glass 3 is 1000mm, the nominal thickness is 5000μm (i.e., 5mm), and the spacing between multiple welding positions is 20mm, that is, a welding position is set every 20mm in the circumferential direction of the upper glass 3. Therefore, before placing the upper glass 3 on the lower glass 4, the welding positions of the upper glass 3 are located by the first and second side edges connected to the upper glass 3. The X-axis is set along the extending direction of the first side edge and the horizontal coordinate x of the welding position is determined. The Y-axis is set along the extending direction of the second side edge and the vertical coordinate y of the welding position is determined. The thickness t of the upper glass 3 is measured every 20mm, thereby measuring the thickness t of the upper glass 3 at each welding position. Taking the position to be welded as an example, where the horizontal coordinate x is 10mm and the vertical coordinate y is 10mm, the thickness t of the upper glass 3 at this position to be welded is 4935.8mm.

[0055] Combination Figure 2 and Figure 4 As shown, the height distance between the welding focal point O of the focused laser beam and the laser welding head 141 is a known fixed value. The height detection structure 142 can directly or indirectly measure the height distance between the laser welding head 141 and the upper surface of the upper glass 3. In this embodiment of the invention, the height detection structure 142 includes a laser height detection head. The height position of the laser height detection head can be the same as the height position of the laser welding head 141, that is, the height distance between the laser height detection head and the upper surface of the upper glass 3 directly measured by the laser height detection head is equal to the height distance between the laser welding head 141 and the upper surface of the upper glass 3. Of course, the height position of the laser height detection head and the height position of the laser welding head 141 can be different. The height detection structure 142 indirectly measures the height distance between the laser welding head 141 and the upper surface of the upper glass 3. If the laser height detection head is higher than the laser welding head 141, the height distance between the laser height detection head and the upper surface of the upper glass 3 measured directly by the laser height detection head minus the height difference between the laser height detection head and the laser welding head 141 is equal to the height distance between the laser welding head 141 and the upper surface of the upper glass 3. If the laser height detection head is lower than the laser welding head 141, the height distance between the laser height detection head and the upper surface of the upper glass 3 measured directly by the laser height detection head plus the height difference between the laser height detection head and the laser welding head 141 is equal to the height distance between the laser welding head 141 and the upper surface of the upper glass 3.

[0056] In this embodiment of the invention, the laser welding equipment further includes a data storage mechanism. This data storage mechanism stores the thickness of the upper glass 3 at the welding position and is communicatively connected to the welding moving mechanism 13. During welding, when the welding moving mechanism 13 moves above a welding position, it can obtain the corresponding thickness of the upper glass 3 at that welding position from the data storage mechanism. Then, based on the height distance H between the welding focal point O of the laser beam and the laser welding head 141, and the thickness t of the upper glass 3 at the welding position, the height distance between the laser welding head 141 and the upper surface of the upper glass 3 is adjusted to the welding height distance h. The welding moving mechanism 13 can drive the laser welding mechanism 14 to move sequentially along the circumference of the upper glass 3 to each welding position according to a preset movement path. Alternatively, the data storage mechanism can also store the position information of each welding position corresponding to the thickness of the upper glass 3 at each welding position. The welding moving mechanism 13 can obtain the position information of each welding position from the data storage mechanism and then drive the laser welding mechanism 14 to move to each welding position.

[0057] The thickness t of the upper glass 3 at each welding location can be measured manually, but to improve measurement efficiency and accuracy, such as... Figure 1 and Figure 5 As shown in the embodiment of this utility model, the laser welding equipment further includes a thickness detection device 2, which includes: a thickness detection stage 21; a detection moving mechanism 22 installed on the thickness detection stage 21; and a thickness detection mechanism 23 installed on the detection moving mechanism 22 and located above the thickness detection stage 21. The upper glass sheet 3 can be placed on the thickness detection stage 21, and the detection moving mechanism 22 can drive the thickness detection mechanism 23 to move above the welding position of the upper glass sheet 3, allowing the thickness detection mechanism 23 to detect the thickness of the upper glass sheet 3 at the welding position. Of course, the thickness detection device 2 can measure the thickness of any glass at multiple positions, and the measurement positions are not limited to the welding position, to determine whether the warpage of the glass meets the requirements based on the thickness distribution, or whether the thickness difference meets the accuracy requirements, thereby screening out glass that does not meet the requirements.

[0058] In this embodiment, the thickness detection mechanism 23 emits a laser beam towards the glass. This laser beam undergoes a first refraction and a first reflection at the upper surface of the glass. The laser beam after the first refraction is then reflected a second time at the lower surface of the glass. The thickness of the glass is calculated and analyzed based on the time difference or phase difference between the first and second reflected laser beams. Furthermore, the height distance between the upper surface of the glass and the thickness detection mechanism 23 can be calculated and analyzed based on the first reflected laser beam. Therefore, the warpage of the glass is determined based on the different height distances between the upper surface of the glass and the thickness detection mechanism 23 at multiple locations. The specific structure and working principle of the thickness detection mechanism 23 in detecting glass thickness are the same as in existing technologies and will not be detailed here.

[0059] Specifically, such as Figure 1 and Figure 5 As shown, the detection moving mechanism 22 includes a third horizontal moving structure 221, a fourth horizontal moving structure 222, and a second lifting structure 223. The third horizontal moving structure 221 is movably arranged along the extension direction of the first side portion, the fourth horizontal moving structure 222 is movably arranged along the extension direction of the second side portion, and the second lifting structure 223 is movably arranged along the height direction. The third horizontal moving structure 221 is mounted on the detection worktable, the fourth horizontal moving structure 222 is mounted on the third horizontal moving structure 221 and located above the detection worktable, the second lifting structure 223 is mounted on the fourth horizontal moving structure 222, and the thickness detection mechanism 23 is mounted on the second lifting structure 223. The specific structures of the third horizontal moving structure 221, the fourth horizontal moving structure 222, and the second lifting structure 223 can be the same as those in the prior art and will not be described in detail here.

[0060] In order to facilitate the data storage mechanism of the laser welding equipment to quickly and accurately obtain the thickness t of the upper glass 3 at each position to be welded, in the embodiment of this utility model, the data storage mechanism is communicatively connected with the thickness detection mechanism 23, and the thickness detection mechanism 23 can transmit and store the thickness of the upper glass 3 at the position to be welded to the data storage mechanism.

[0061] In addition, the upper glass 3 is provided with a QR code recognition structure, the thickness detection device 2 also includes a first scanning and reading mechanism for scanning and reading the QR code recognition structure, the laser welding device 1 also includes a second scanning and reading mechanism for scanning and reading the QR code recognition structure, and the data storage mechanism is communicatively connected to the first scanning and reading mechanism and the second scanning and reading mechanism respectively.

[0062] Combination Figure 5 , Figure 6 as well as Figure 7As shown, after the upper glass 3 is placed on the thickness detection stage 21 of the thickness detection device 2, the first scanning and reading mechanism scans and reads the QR code information obtained by the QR code recognition structure and stores it in the data storage mechanism corresponding to the thickness of the upper glass 3 at each welding position measured by the thickness detection mechanism 23. After the upper glass 3 is placed on the welding worktable 11 of the laser welding device 1, the data storage mechanism retrieves the corresponding thickness of the upper glass 3 at each welding position according to the QR code information obtained by the second scanning and reading mechanism and transmits it to the welding moving mechanism 13. Then, the welding moving mechanism 13 sequentially drives the laser welding mechanism 14 to move above each welding position of the upper glass 3 and the lower glass 4. According to the height distance H between the welding focus O of the laser beam and the laser welding head 141 and the thickness t of the upper glass 3 at each welding position, the height distance between the laser welding head 141 and the upper surface of the upper glass 3 is adjusted to the welding height distance h. Then, the upper glass 3 and the lower glass 4 are welded sequentially at each welding position by the laser welding head 141.

[0063] In summary, combining Figure 3 As shown, the laser welding equipment of this invention compensates for the welding height distance h between the laser welding head 141 and the upper surface of the upper glass 3 according to the thickness t of the upper glass 3 at the welding position during the welding process. This ensures that the welding focal point O of the laser beam at each welding position is always located at the bonding point of the upper glass 3 and the lower glass 4, thereby ensuring that the plasma generated by the welding of the upper glass 3 and the lower glass 4 at each welding position is re-solidified to form a teardrop-shaped welded fusion structure 7. Figures 11 to 15 (As shown in the figure) The distribution is reasonable, ensuring that the welding strength of the upper glass 3 and the lower glass 4 meets the requirements.

[0064] To better understand and implement this utility model, a comparative analysis of a pair of proportions and a preferred embodiment is provided below:

[0065] In the comparative example, during the welding process where the welding moving mechanism 13 drives the laser welding mechanism 14 to weld along a preset moving path, the first lifting structure 133 of the welding moving mechanism 13 drives the laser welding mechanism 14 to change in height at any time, so that the height distance between the laser height detection head of the height detection structure 142 and the upper surface of the upper glass 3 is always a preset fixed value. Correspondingly, the welding height distance h between the laser welding head 141 and the upper surface of the upper glass 3 is also always a preset fixed value. The position of the welding focal point O of the laser beam, the height distance H between the laser welding heads 141, the nominal thickness T of the upper glass 3, and the welding height distance h between the laser welding head 141 and the upper surface of the upper glass 3 satisfy the relationship: h = HT; therefore, according to Figure 8The diagram illustrates the height change curve of the laser height detection head of the schematic height detection structure 142. Taking the initial height position of the laser height detection head as the zero point, it can be seen that the maximum height difference of the laser height detection head during the welding process reaches 0.08mm (i.e., 80μm). Since the height distance between the laser height detection head and the laser welding head 141 remains unchanged, the height change of the laser height detection head is equal to the height change of the laser welding head 141. In other words, the maximum height difference of the welding focal point O of the laser beam focused by the laser welding head 141 also reaches 80μm, which far exceeds the ideal focal depth of laser welding within the process window of ±10μm.

[0066] In a preferred embodiment, during the welding process where the welding moving mechanism 13 drives the laser welding mechanism 14 to weld along a preset moving path, the first lifting structure 133 of the welding moving mechanism 13 drives the laser welding head 141 to change in the height direction at any time. The welding height of the laser welding head 141 is compensated according to the thickness t at each welding position, so that the height distance H between the welding focal point O of the laser beam and the laser welding head 141, the thickness t of the upper glass 3 at the welding position, and the welding height distance h between the laser welding head 141 and the upper surface of the upper glass 3 satisfy the relationship: h = Ht. Therefore, after four repeated experiments, the following is obtained: Figure 9 The schematic diagram of the height change curves of the laser welding head 141 in four tests shows that, with the initial height position of the laser height detection head as the zero point, the initial position of the laser welding head 141 is 1.244 mm above this zero point. It can be seen that the maximum height difference of the laser welding head 141 during the welding process is only 0.004 mm (i.e., 4 μm). In other words, the maximum height difference of the welding focal point O of the laser beam is also only 4 μm, which meets the process window of ±10 μm for the ideal focal depth of laser welding.

[0067] like Figure 10 As shown, five welding paths (which can be defined as welding path AA, welding path BB, welding path CC, welding path DD, and welding path EE) are selected on the same upper glass 3 and lower glass 4. For example, within a length range of 1000mm, two welding paths (i.e., welding path AA and welding path EE) are selected at 40mm from the two edges respectively. Between these two welding paths, a welding path is selected every 230mm, namely welding path BB, welding path CC, and welding path DD. In each welding path, half is welded using the welding method in the comparative example, and the other half is welded using the welding method in the preferred embodiment.

[0068] from Figures 11 to 15The comparison diagrams of the weld cross-sections of the five weld paths shown indicate that, in the comparative example, the distance between the upper end (i.e., the round end) of the teardrop-shaped welded fusion structure 7 and the weld seam 8 (i.e., the joint between the upper glass 3 and the lower glass 4) varies from 67.2 μm to 82.52 μm, and the distance between the lower end (i.e., the pointed end) of the teardrop-shaped welded fusion structure 7 and the weld seam 8 between the upper glass 3 and the lower glass 4 varies from 184.47 μm to 198.53 μm; while in the preferred embodiment, the distance between the upper end of the teardrop-shaped welded fusion structure 7 and the weld seam 8 between the upper glass 3 and the lower glass 4 varies from 96.38 μm to 99.51 μm, and the distance between the lower end of the teardrop-shaped welded fusion structure 7 and the weld seam 8 between the upper glass 3 and the lower glass 4 varies from 174.76 μm to 183.58 μm.

[0069] Therefore, in the preferred embodiment, the distance variation between the two ends of the welded fusion structure 7 and the weld seam 8 is less than that between the two ends of the welded fusion structure 7 and the weld seam 8 in the comparative example. Furthermore, in the preferred embodiment, the distance between the center of the welded fusion structure 7 and the weld seam 8 is also less than that between the center of the welded fusion structure 7 and the weld seam 8 in the comparative example. This results in the welding quality of the upper glass 3 and the lower glass 4 in the preferred embodiment being significantly higher than that of the upper glass 3 and the lower glass 4 in the comparative example.

[0070] The above descriptions are merely a few embodiments of this utility model. Those skilled in the art can make various modifications or variations to the embodiments of this utility model based on the content disclosed in the application documents without departing from the spirit and scope of this utility model.

Claims

1. A laser welding device, characterized in that, Includes a laser welding apparatus, the laser welding apparatus comprising: Welding workbench; A clamping mechanism is installed on the welding worktable, and the clamping mechanism is used to press and fix the stacked upper and lower glass sheets to the welding worktable. Welding moving mechanism; A laser welding mechanism is installed on the welding moving mechanism and located above the welding worktable. The laser welding mechanism includes a laser welding head and a height detection structure. The laser welding head is used to generate a laser beam downwards, and the height detection structure is used to detect the height distance between the laser welding head and the upper surface of the upper glass. The welding moving mechanism can move the laser welding mechanism to the position to be welded above the upper glass and the lower glass, and adjust the height distance between the laser welding head and the upper surface of the upper glass to the welding height distance according to the position of the welding focal point of the laser beam and the height distance between the laser welding head and the thickness of the upper glass at the position to be welded.

2. The laser welding equipment as described in claim 1, characterized in that, The welding height spacing is h, the height spacing between the welding focal point of the laser beam and the laser welding head is H, and the thickness of the upper glass at the welding position is t, which have the following relationship: h = Ht.

3. The laser welding equipment as described in claim 1, characterized in that, The laser welding equipment also includes a data storage mechanism for storing the thickness of the upper glass at the position to be welded, and the data storage mechanism is communicatively connected to the welding moving mechanism.

4. The laser welding equipment as described in claim 3, characterized in that, The laser welding equipment further includes a thickness detection device, which comprises: Thickness measurement station; The detection moving mechanism is installed on the thickness detection stage; A thickness detection mechanism is installed on the detection moving mechanism and located above the thickness detection stage; The upper glass sheet can be placed on the thickness detection stage, and the detection moving mechanism can drive the thickness detection mechanism to move above the welding position of the upper glass sheet, so that the thickness detection mechanism can detect the thickness of the upper glass sheet at the welding position.

5. The laser welding equipment as described in claim 4, characterized in that, The data storage mechanism is communicatively connected to the thickness detection mechanism, and the thickness detection mechanism can transmit and store the thickness of the upper glass at the position to be welded to the data storage mechanism.

6. The laser welding equipment as described in claim 4, characterized in that, The upper glass is provided with a QR code recognition structure. The thickness detection device further includes a first scanning and reading mechanism for scanning and reading the QR code recognition structure. The laser welding device further includes a second scanning and reading mechanism for scanning and reading the QR code recognition structure. The data storage mechanism is communicatively connected to the first scanning and reading mechanism and the second scanning and reading mechanism, respectively.

7. The laser welding equipment as described in claim 1, characterized in that, Both the upper and lower glass panes have two opposing first side portions and two opposing second side portions; The welding moving mechanism includes a first horizontal moving structure, a second horizontal moving structure, and a first lifting structure. The first horizontal moving structure is movably arranged along the extension direction of the first side portion, the second horizontal moving structure is movably arranged along the extension direction of the second side portion, and the first lifting structure is movably arranged along the height direction. The welding worktable is installed on the first horizontal moving structure, the second horizontal moving structure is erected above the welding worktable, the first lifting structure is installed on the second horizontal moving structure, and the laser welding mechanism is installed on the first lifting structure.

8. The laser welding equipment as described in claim 1, characterized in that, The height detection structure includes a laser height detection head.

9. The laser welding equipment as described in any one of claims 1-8, characterized in that, The laser welding mechanism also includes a laser gap detection head, which is used to detect the gap between the upper glass and the lower glass at the position to be welded.

10. The laser welding equipment as described in any one of claims 1-8, characterized in that, The lower glass pane is provided with an air extraction port, which is connected to the gap space between the upper glass pane and the lower glass pane; the laser welding device also includes a vacuum mechanism, the welding worktable is provided with an air extraction channel, and the vacuum mechanism is connected to the air extraction port through the air extraction channel.

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