A cast glass curtain wall manufacturing device and manufacturing process

Abstract

The application discloses a kind of cast glass curtain wall manufacturing equipment and manufacturing process, it is related to special glass preparation field;The cast glass curtain wall manufacturing equipment and manufacturing process, through the full-automatic assembly line layout of feeder car, lifting conveying table, constant-temperature furnace, transfer roller bed, turnover assembly and multiple annealing chambers, seamless connection of glass liquid injection, constant-temperature forming, turnover demolding and annealing treatment is realized, production rhythm is greatly shortened and labor intensity is reduced;Turnover assembly is overturned integrally by third mounting frame, in inverted state, glass is smoothly separated from mold by gravity and falls to fourth conveying roller bed, significantly improves yield and prolongs mold life;After demolding, mold is transmitted back to feeder car by original route in reverse direction, realizes mold recycling, multiple annealing chambers can continuously receive glass and carry out segmented temperature control annealing, matches with upstream discharge rate, guarantees the continuity and stability of mass production, comprehensively improves the equipment automation level, production efficiency and product yield.

Description

Technical Field

[0001] This invention relates to special glass preparation technology, specifically to a casting glass curtain wall manufacturing equipment and manufacturing process. Background Technology

[0002] The field of cast glass curtain wall manufacturing technology involves injecting molten glass into a mold and preparing curtain wall components through processes such as forming, cooling, and annealing. Existing manufacturing equipment typically consists of independently operated manual workbenches or semi-automatic single machines. The transfer of molds and semi-finished products between processes relies on forklifts, lifting equipment, or manual handling, lacking fully automated connection from feeding, constant temperature forming, demolding, to annealing. Especially in the demolding stage after the molten glass cools to the process temperature, conventional equipment mostly uses manual prying or mechanical vibration to separate the glass from the mold. This not only easily scratches the glass surface and causes mold deformation or breakage, but also results in uneven stress on the glass when it leaves the mold, affecting the flatness and optical performance of the finished product.

[0003] Therefore, in order to improve the yield and quality of glass curtain wall products, it is necessary to improve the existing glass curtain wall production line. Summary of the Invention

[0004] The purpose of this invention is to provide a casting-type glass curtain wall manufacturing equipment and manufacturing process to solve the yield problems of insufficient flatness in the finished glass curtain wall products produced by the existing technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a casting-type glass curtain wall manufacturing equipment, comprising:

[0006] A feeding trolley, on which a first conveyor roller bed is installed;

[0007] A lifting conveyor platform is provided on one side of the feeding vehicle, including a first mounting frame, a transmission component provided on the first mounting frame, and a second conveyor roller bed slidably connected to the first mounting frame, wherein the second conveyor roller bed is drivenly connected to the transmission component;

[0008] A constant temperature furnace is set on one side of the lifting conveyor platform, including a second mounting frame and a cover mounted on the second mounting frame. Automatic sealing doors are provided at both ends of the cover. A fifth conveyor roller bed located inside the cover is mounted on the second mounting frame.

[0009] A transfer roller bed is located on one side of the constant temperature furnace;

[0010] A flipping assembly is provided on one side of the transfer roller bed, including a third mounting frame. A third transfer roller bed and a fourth transfer roller bed are fixedly mounted on the third mounting frame and are arranged opposite to each other. A flipping assembly is externally connected to the third mounting frame. The third mounting frame is also provided with a snapping assembly for snapping the glass curtain wall mold and a receiving assembly for receiving the glass curtain wall.

[0011] The annealing chamber is located on one side of the flipping assembly.

[0012] Preferably, the transmission assembly includes a first motor fixedly mounted on the first mounting frame and a transmission link mounted on the first mounting frame. Power is transmitted between the plurality of transmission links through a gear pair. A lead screw that is connected to the transmission link is mounted on the first mounting frame, and the lead screw is threadedly connected to the second conveyor roller bed.

[0013] Preferably, the automatic sealing door includes a sliding sealing door slidably connected to both ends of the housing and a winch fixedly installed on the housing. The rotating end of the winch is connected to the sliding sealing door by a cable that winds around the second mounting frame. A steering wheel for receiving the cable is installed on the second mounting frame.

[0014] Preferably, the reversing assembly includes two positioning rings fixedly installed at both ends of the third mounting bracket and a toothed ring fixedly installed in the middle of the third mounting bracket. It also includes a positioning wheel and a steering motor fixedly installed on the ground. The positioning wheel abuts against the positioning ring, and a steering gear that meshes with the toothed ring is fixedly connected to the output shaft of the steering motor.

[0015] Preferably, the snap-fit ​​assembly includes a slide rail connected to the third mounting bracket and a clamp slidably connected to the slide rail. A first telescopic rod is fixedly connected to the third mounting bracket, and the telescopic end of the first telescopic rod is connected to the clamp.

[0016] Preferably, the receiving assembly includes a second telescopic rod fixedly mounted on the third mounting frame and a receiving rod fixedly mounted on the telescopic end of the second telescopic rod, the receiving rod being sandwiched between adjacent conveyor rollers of the fourth conveyor roller bed.

[0017] Preferably, there are multiple annealing chambers, which are connected end to end.

[0018] A casting-type glass curtain wall manufacturing process, applied to casting-type glass curtain wall manufacturing equipment, includes the following steps:

[0019] S1. The feeding trolley carries the glass curtain wall mold to receive the molten glass, and moves the mold with the molten glass to the lifting conveyor platform through the first conveyor roller bed.

[0020] S2. The lifting conveyor receives the mold through the second conveyor roller bed, and adjusts the height of the second conveyor roller bed through the transmission component to transfer the mold with molten glass to the constant temperature furnace.

[0021] S3. The constant temperature furnace receives a mold containing molten glass. The molten glass in the mold is cooled and shaped in the constant temperature furnace. The mold and glass, whose temperature has been reduced to the process temperature range, are then transferred to the transfer roller bed via the fifth transfer roller bed.

[0022] S4. The transfer roller bed conveys the mold and glass to the flipping assembly;

[0023] S5. The flipping assembly receives the mold via the third conveyor roller bed. The first telescopic rod extends and drives the clamping piece to slide and clamp the mold on the slide rail. The second telescopic rod extends and drives the receiving rod to abut against the glass inside the mold. The steering motor drives the gear ring and the third mounting bracket to rotate through the steering gear, so that the third and fourth conveyor roller beds are inverted. The second telescopic rod retracts, and the glass leaves the mold under the action of gravity and falls onto the fourth conveyor roller bed along with the receiving rod. The fourth conveyor roller bed then transports the glass to the annealing chamber for annealing.

[0024] S6. The steering motor drives the gear ring and the third mounting bracket to rotate again through the steering gear, adjusting the third conveyor roller bed to the lower position, retracting the first telescopic rod to remove the clamping piece, and transferring the mold back to the first conveyor roller bed through the third conveyor roller bed, the transfer roller bed, the fifth conveyor roller bed, and the second conveyor roller bed for the next process cycle.

[0025] Compared with existing technologies, the present invention provides a casting-type glass curtain wall manufacturing equipment and process. Through a fully automated production line layout of a feeding trolley, lifting conveyor, constant temperature furnace, transfer roller bed, tilting assembly, and multiple annealing chambers, it achieves seamless integration of glass melt injection, constant temperature forming, tilting demolding, and annealing. This eliminates the need for manual handling or external lifting equipment, significantly shortening the production cycle and reducing labor intensity. The lifting conveyor can precisely adjust the height of the second transfer roller bed, ensuring a smooth transition of the mold between different workstations and preventing glass melt sloshing or mold misalignment due to height differences. The constant temperature furnace is equipped with sliding sealed doors at both ends, driven by winches and cables, which, with the help of steering wheels, enable rapid opening and closing, effectively maintaining a uniform and stable temperature inside the furnace, promoting uniform crystallization of the glass melt and stress release, and improving… The finished product boasts superior optical quality and structural strength. The flipping assembly, driven by a positioning ring, a toothed ring, and a steering motor, flips the third mounting frame. Simultaneously, the clamping plates driven by the first telescopic rod hold the mold, and the receiving rod driven by the second telescopic rod lifts the glass. In this inverted state, the glass smoothly detaches from the mold under gravity and falls onto the fourth conveyor roller bed. This eliminates scratches, deformation, and mold damage caused by traditional prying or vibration demolding, significantly improving yield and extending mold life. After demolding, the mold is transported back to the feeding car via the original route, enabling mold recycling. Multiple interconnected annealing chambers continuously receive glass and perform segmented temperature-controlled annealing, matching the upstream discharge rate to ensure the continuity and stability of mass production. This comprehensively improves the equipment's automation level, production efficiency, and product yield. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the lifting conveyor structure provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the constant temperature furnace structure provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the flip component structure provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the loading structure of the flipping component provided in an embodiment of the present invention;

[0032] Figure 6This is a schematic diagram of the material feeding structure of the flipping component provided in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Feeding trolley; 11. First conveyor roller bed; 2. Lifting conveyor platform; 21. First mounting frame; 22. First motor; 23. Transmission connecting rod; 24. Lead screw; 25. Second conveyor roller bed; 3. Constant temperature furnace; 31. Second mounting frame; 32. Cover; 33. Sliding sealing door; 34. Winch; 35. Cable; 36. Steering wheel; 37. Fifth conveyor roller bed; 4. Transfer roller bed; 5. Tilting assembly; 51. Third mounting frame; 52. Third conveyor roller bed; 53. Fourth conveyor roller bed; 54. Positioning ring; 55. Gear ring; 56. Positioning wheel; 57. Steering motor; 58. Steering gear; 59. Slide rail; 510. First telescopic rod; 511. Clamping plate; 512. Second telescopic rod; 513. Receiving rod; 6. Annealing chamber. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] As attached Figure 1 To be continued Figure 6 As shown:

[0037] Example:

[0038] This invention provides a casting-type glass curtain wall manufacturing equipment, comprising:

[0039] Feeding carriage 1, wherein a first conveyor roller bed 11 is provided on the feeding carriage 1;

[0040] The lifting conveyor 2 is located on one side of the feeding car 1 and includes a first mounting frame 21, a transmission component mounted on the first mounting frame 21, and a second conveyor roller bed 25 slidably connected to the first mounting frame 21. The second conveyor roller bed 25 is connected to the transmission component in a transmission manner.

[0041] The constant temperature furnace 3 is located on one side of the lifting conveyor platform 2, including a second mounting frame 31 and a cover 32 mounted on the second mounting frame 31. The cover 32 is provided with automatic sealing doors at both ends. A fifth conveyor roller bed 37 located inside the cover 32 is mounted on the second mounting frame 31.

[0042] The transfer roller bed 4 is located on one side of the constant temperature furnace 3;

[0043] The flipping component 5 is disposed on one side of the transfer roller bed 4 and includes a third mounting frame 51. The third mounting frame 51 is fixedly mounted with a third transfer roller bed 52 and a fourth transfer roller bed 53 arranged opposite to each other. The third mounting frame 51 is externally connected to a flipping component. The third mounting frame 51 is also provided with a snapping component for snapping the glass curtain wall mold and a receiving component for receiving the glass curtain wall.

[0044] Annealing chamber 6 is disposed on one side of the flipping assembly 5. Multiple annealing chambers 6 are provided and are arranged end to end.

[0045] As can be seen from the above, the fully automated production line layout, consisting of a feeding trolley 1, a lifting conveyor 2, a constant temperature furnace 3, a transfer roller bed 4, a tilting assembly 5, and multiple annealing chambers 6, achieves seamless integration of glass melt injection, constant temperature forming, tilting demolding, and annealing. This eliminates the need for manual handling or external lifting equipment, significantly shortening the production cycle and reducing labor intensity. The lifting conveyor 2 can precisely adjust the height of the second transfer roller bed 25, ensuring a smooth transition of the mold between different workstations and preventing glass melt swaying or mold misalignment due to height differences. The constant temperature furnace 3 is equipped with automatically sealing doors that can be quickly opened and closed, effectively maintaining a uniform and stable temperature inside the furnace, promoting uniform crystallization of the glass melt, and... Force release enhances the optical quality and structural strength of the finished product; the flipping component 5 flips as a whole through the third mounting frame 51, allowing the glass to smoothly detach from the mold and fall onto the fourth conveyor roller bed 53 in an inverted state, eliminating scratches, deformation, and mold damage caused by traditional prying or vibration demolding, significantly improving the yield and extending the mold life; after demolding, the mold is conveyed back to the feeding car in the reverse direction along the original route, realizing mold recycling, while multiple annealing chambers 6 connected end to end can continuously receive glass and perform segmented temperature-controlled annealing, matching the upstream discharge rate, ensuring the continuity and stability of mass production, and comprehensively improving the automation level, production efficiency, and product yield of the equipment.

[0046] The transmission assembly includes a first motor 22 fixedly mounted on the first mounting frame 21 and a transmission link 23 mounted on the first mounting frame 21. The multiple transmission links 23 transmit power to each other through gear pairs. A lead screw 24, which is connected to the transmission link 23, is mounted on the first mounting frame 21. The lead screw 24 is threadedly connected to the second conveyor roller bed 25. The power of the first motor 22 is transmitted to the lead screw 24 via the transmission link 23 and the gear pair. The rotating lead screw 24 can drive the second conveyor roller bed 25 to move up and down, thereby adjusting the height of the mold by the second conveyor roller bed 25.

[0047] The automatic sealing door includes a sliding sealing door 33 slidably connected to both ends of the housing 32 and a winch 34 fixedly installed on the housing 32. The rotating end of the winch 34 is connected to the sliding sealing door 33 by a cable 35 that passes around the second mounting frame 31. The second mounting frame 31 is equipped with a steering wheel 36 that supports the cable 35. When the winch 34 is started, it can retract and extend the cable 35, and then the cable 35 passes around the steering wheel 36 to drive the sliding sealing door 33 to move, thereby realizing the opening and closing of the inlet and outlet at both ends of the housing 32.

[0048] The reversing assembly includes two positioning rings 54 fixedly installed at both ends of the third mounting frame 51 and a toothed ring 55 fixedly installed in the middle of the third mounting frame 51. It also includes a positioning wheel 56 and a steering motor 57 fixedly installed on the ground. The positioning wheel 56 abuts against the positioning rings 54. A steering gear 58 that meshes with the toothed ring 55 is fixedly connected to the output shaft of the steering motor 57. When the output shaft of the steering motor 57 drives the steering gear 58 to rotate, the steering gear 58 drives the third mounting frame 51 to rotate through the toothed ring 55, thereby reversing the positions of the third conveyor roller bed 52 and the fourth conveyor roller bed 53.

[0049] The snap-fit ​​assembly includes a slide rail 59 connected to the third mounting frame 51 and a clamping piece 511 slidably connected to the slide rail 59. A first telescopic rod 510 is fixedly connected to the third mounting frame 51. The telescopic end of the first telescopic rod 510 is connected to the clamping piece 511. When the mold containing glass slides onto the third conveyor roller bed 52, the first telescopic rod 510 extends and drives the clamping piece 511 to slide on the slide rail 59. The sliding clamping piece 511 clamps the mold, preventing the mold from shaking during the flipping process of the third mounting frame 51.

[0050] The receiving assembly includes a second telescopic rod 512 fixedly mounted on the third mounting frame 51 and a receiving rod 513 fixedly mounted on the telescopic end of the second telescopic rod 512. The receiving rod 513 is sandwiched between adjacent conveyor rollers of the fourth conveyor roller bed 53. Before the mold is flipped, the second telescopic rod 512 can be extended to drive the receiving rod 513 to abut against the glass surface in the mold, preventing the glass from detaching from the mold during the flipping process. When the third mounting frame 51 is fully flipped, with the third conveyor roller bed 52 on top and the fourth conveyor roller bed 53 on the bottom, the glass that has been demolded under the gravity of the retracted second telescopic rod 512 moves along with the receiving rod 513 to the fourth conveyor roller bed 53, and the fourth conveyor roller bed 53 conveys the glass into the annealing chamber 6.

[0051] A casting-type glass curtain wall manufacturing process, applied to casting-type glass curtain wall manufacturing equipment, includes the following steps:

[0052] S1. The feeding car 1 drives the glass curtain wall mold to receive the molten glass, and transfers the mold with the molten glass to the lifting conveyor 2 through the first conveyor roller bed 11.

[0053] S2. The lifting conveyor 2 receives the mold through the second conveyor roller bed 25 and adjusts the height of the second conveyor roller bed 25 through the transmission component to transfer the mold with molten glass to the constant temperature furnace 3.

[0054] S3. The constant temperature furnace 3 receives a mold containing molten glass. The molten glass in the mold is cooled and shaped in the constant temperature furnace 3. The mold and glass, whose temperature has been reduced to the process temperature range, are then transferred to the transfer roller bed 4 via the fifth transfer roller bed 37.

[0055] S4, the transfer roller bed 4 conveys the mold and glass to the flipping assembly 5;

[0056] S5. The flipping assembly 5 receives the mold via the third conveyor roller bed 52. The first telescopic rod 510 extends and drives the clamping piece 511 to slide and clamp the mold on the slide rail 59. The second telescopic rod 512 extends and drives the receiving rod 513 to abut against the glass inside the mold. The steering motor 57 drives the gear ring 55 and the third mounting bracket 51 to rotate via the steering gear 58, so that the third conveyor roller bed 52 and the fourth conveyor roller bed 53 are inverted. The second telescopic rod 512 is retracted, and the glass leaves the mold under the action of gravity and falls onto the fourth conveyor roller bed 53 along with the receiving rod 513. The fourth conveyor roller bed 53 then transports the glass to the annealing chamber 6 for annealing.

[0057] S6. Steering motor 57 drives gear ring 55 and third mounting bracket 51 to rotate again through steering gear 58, adjusts third conveyor roller bed 52 to the lower position, retracts first telescopic rod 510 to remove clamp 511, and transfers mold back to first conveyor roller bed 11 through third conveyor roller bed 52, transfer roller bed 4, fifth conveyor roller bed 37 and second conveyor roller bed 25 for the next process cycle.

[0058] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A casting-type glass curtain wall manufacturing equipment, characterized in that, include: Feeding car (1), the feeding car (1) is equipped with a first conveyor roller bed (11). The lifting conveyor (2) is set on one side of the feeding car (1) and includes a first mounting frame (21), a transmission component set on the first mounting frame (21) and a second conveyor roller bed (25) slidably connected to the first mounting frame (21). The second conveyor roller bed (25) is connected to the transmission component in a transmission connection. The constant temperature furnace (3) is set on one side of the lifting conveyor (2), including a second mounting frame (31) and a cover (32) mounted on the second mounting frame (31). Automatic sealing doors are provided at both ends of the cover (32), and a fifth conveyor roller bed (37) located inside the cover (32) is installed on the second mounting frame (31). A transfer roller bed (4) is set on one side of the constant temperature furnace (3); The flipping component (5) is disposed on one side of the transfer roller bed (4) and includes a third mounting frame (51). A third transfer roller bed (52) and a fourth transfer roller bed (53) are fixedly mounted on the third mounting frame (51) and are arranged opposite to each other. A reversing component is connected to the outside of the third mounting frame (51). The third mounting frame (51) is also provided with a snap-fit ​​component for snapping the glass curtain wall mold and a receiving component for receiving the glass curtain wall. Annealing chamber (6) is located on one side of the flipping assembly (5).

2. The casting-type glass curtain wall manufacturing equipment according to claim 1, characterized in that, The transmission assembly includes a first motor (22) fixedly mounted on the first mounting frame (21) and a transmission link (23) mounted on the first mounting frame (21). The multiple transmission links (23) transmit power to each other through a gear pair. A lead screw (24) that is connected to the transmission link (23) is mounted on the first mounting frame (21). The lead screw (24) is threadedly connected to the second conveyor roller bed (25).

3. The casting-type glass curtain wall manufacturing equipment according to claim 1, characterized in that, The automatic sealing door includes a sliding sealing door (33) slidably connected to both ends of the housing (32) and a winch (34) fixedly installed on the housing (32). The rotating end of the winch (34) is connected to the sliding sealing door (33) by a cable (35) that passes through the second mounting frame (31). The second mounting frame (31) is equipped with a steering wheel (36) that supports the cable (35).

4. The casting-type glass curtain wall manufacturing equipment according to claim 1, characterized in that, The reversing assembly includes two positioning rings (54) fixedly mounted at both ends of the third mounting bracket (51) and a toothed ring (55) fixedly mounted in the middle of the third mounting bracket (51). It also includes a positioning wheel (56) and a steering motor (57) fixedly mounted on the ground. The positioning wheel (56) abuts against the positioning ring (54), and a steering gear (58) that meshes with the toothed ring (55) is fixedly connected to the output shaft of the steering motor (57).

5. The casting-type glass curtain wall manufacturing equipment according to claim 1, characterized in that, The snap-fit ​​assembly includes a slide rail (59) connected to the third mounting bracket (51) and a clip (511) slidably connected to the slide rail (59). A first telescopic rod (510) is fixedly connected to the third mounting bracket (51), and the telescopic end of the first telescopic rod (510) is connected to the clip (511).

6. The casting-type glass curtain wall manufacturing equipment according to claim 1, characterized in that, The receiving assembly includes a second telescopic rod (512) fixedly mounted on the third mounting frame (51) and a receiving rod (513) fixedly mounted on the telescopic end of the second telescopic rod (512), the receiving rod (513) being sandwiched between adjacent conveyor rollers of the fourth conveyor roller bed (53).

7. The casting-type glass curtain wall manufacturing equipment according to claim 1, characterized in that, Multiple annealing chambers (6) are provided, and the multiple annealing chambers (6) are connected end to end.

8. A manufacturing process for cast glass curtain walls, characterized in that, The method is applied to the casting-type glass curtain wall manufacturing equipment as described in any one of claims 1-7, and the steps include: S1. The feeding car (1) drives the glass curtain wall mold to receive the glass liquid and transfers the mold with the glass liquid to the lifting conveyor (2) through the first conveyor roller bed (11). S2. The lifting conveyor (2) receives the mold through the second conveyor roller bed (25) and adjusts the height of the second conveyor roller bed (25) through the transmission component to transfer the mold with molten glass to the constant temperature furnace (3). S3. The constant temperature furnace (3) receives the mold with molten glass. The molten glass in the mold is cooled and formed in the constant temperature furnace (3). The mold and glass, whose temperature has been reduced to the process temperature range, are transferred to the transfer roller bed (4) via the fifth transfer roller bed (37). S4, the transfer roller bed (4) transfers the mold and glass to the flipping assembly (5); S5. The flipping assembly (5) receives the mold through the third conveyor roller bed (52). The first telescopic rod (510) extends and drives the clamping piece (511) to slide and clamp the mold on the slide rail (59). The second telescopic rod (512) extends and drives the receiving rod (513) to abut against the glass inside the mold. The steering motor (57) drives the gear ring (55) and the third mounting bracket (51) to rotate through the steering gear (58), so that the third conveyor roller bed (52) and the fourth conveyor roller bed (53) are inverted, the second telescopic rod (512) is retracted, and the glass leaves the mold under the action of gravity and falls onto the fourth conveyor roller bed (53) along with the receiving rod (513). The fourth conveyor roller bed (53) then transports the glass to the annealing chamber (6) for annealing. S6. The steering motor (57) drives the gear ring (55) and the third mounting bracket (51) to rotate again through the steering gear (58), adjust the third transfer roller bed (52) to the lower position, retract the first telescopic rod (510) to remove the clamping piece (511), and transfer the mold back to the first transfer roller bed (11) through the third transfer roller bed (52), transfer roller bed (4), fifth transfer roller bed (37), and second transfer roller bed (25) for the next process cycle.

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