CN217709237U

CN217709237U - Air grid quenching device for production of toughened glass

Info

Publication number: CN217709237U
Application number: CN202222197420.6U
Authority: CN
Inventors: 杨丹; 宣建凤; 李照营; 熊慧萍; 杨帅
Original assignee: Nanjing Longxin Toughened Glass Co ltd
Current assignee: Nanjing Longxin Toughened Glass Co ltd
Priority date: 2022-08-20
Filing date: 2022-08-20
Publication date: 2022-11-01
Anticipated expiration: 2032-08-20

Abstract

The utility model belongs to the technical field of toughened glass production and processing equipment's technique and specifically relates to an air grid quenching device is used in toughened glass production, and it includes the workstation, be provided with a plurality of bearing high temperature glass's that are used for universal ball on the workstation, the top surface and the bottom surface of workstation all are provided with and are used for the air grid that bloies towards high temperature glass, be provided with on the workstation and be used for driving high temperature glass and remove and accomplish forced air cooling's drive assembly one. This application has the effect of the cooling degree of consistency of high temperature glass lower surface when promoting the quenching.

Description

Air grid quenching device for production of toughened glass

Technical Field

The application relates to the technical field of toughened glass production and processing equipment, in particular to an air grid quenching device for toughened glass production.

Background

The toughened glass is special glass formed by heating common flat glass to a temperature close to the softening temperature of the glass, keeping the temperature for a certain time and quenching. When high-temperature plate glass is quenched, a blowing quenching device is generally used, the blowing quenching device mainly comprises a workbench for bearing the sliding of the high-temperature glass, an upper air grid and a lower air grid which blow air towards the surface of the high-temperature glass, and conveying rollers are generally adopted on the workbench for conveying the high-temperature glass.

Aiming at the related technologies, the inventor finds that in the quenching process of the high-temperature glass, a contact covering surface formed by bearing of the conveying roller always exists on the lower surface of the high-temperature glass in unit time, so that the condition of uneven cooling always exists on the lower surface of the high-temperature glass when the lower surface of the high-temperature glass is blown and quenched by a lower air grid, and therefore uneven stress occurs on the lower surface of the high-temperature glass, stress spots are formed, and the attractiveness of toughened glass is affected.

SUMMERY OF THE UTILITY MODEL

In order to promote the cooling degree of consistency of high temperature glass lower surface when quenching, this application provides a toughened glass production is with air grid quenching device.

The application provides a wind grating quenching device for toughened glass production adopts following technical scheme:

the utility model provides a toughened glass production is with air grid quenching device, includes the workstation, be provided with a plurality of universal balls that are used for bearing high temperature glass on the workstation, the top surface and the bottom surface of workstation all are provided with the air grid that is used for towards high temperature glass bloies, be provided with on the workstation and be used for driving high temperature glass and remove and accomplish forced air cooling's drive assembly one.

Through adopting above-mentioned technical scheme, in the cooling process, high temperature glass's lower surface is the point contact all the time with universal ball's contact mode for the cold air that is located the air grid below the workstation and blows out obtains promoting at the mobility of high temperature glass lower surface, has increased the instantaneous cooling area of high temperature glass lower surface, has promoted the cooling degree of consistency of high temperature glass lower surface, is favorable to reducing the formation of toughened glass surface stress spot, has improved toughened glass's aesthetic property.

In a specific implementation mode, one driving assembly comprises two groups of synchronous pulley sets, and the two groups of synchronous pulley sets are arranged on two opposite sides of the workbench in a one-to-one correspondence manner; the synchronous pulley set comprises a pair of synchronous pulleys which are rotationally connected with the workbench, the pair of synchronous pulleys are sequentially arranged along the moving direction of the high-temperature glass, the pair of synchronous pulleys are connected with a synchronous belt in a transmission manner, and a first motor for driving the synchronous pulleys to rotate is arranged on the workbench; the synchronous belt is connected with a clamping piece used for clamping high-temperature glass.

Through adopting above-mentioned technical scheme, a motor drive synchronizing wheel rotates and drives the hold-in range and rotates, and the hold-in range rotates and drives the high temperature glass on the holder clamping table and remove, has realized high temperature glass's slip cooling and automatic conveying, is favorable to promoting the cooling degree of consistency on high temperature glass surface, has improved toughened glass's production efficiency simultaneously.

In a specific possible implementation scheme, the synchronizing wheels of the two groups of synchronizing wheel sets are opposite one to one, and a synchronizing rod is coaxially and fixedly connected with the two opposite synchronizing wheels.

Through adopting above-mentioned technical scheme for the transfer rate of two hold-in ranges is unanimous, and then makes the translation rate of each holder unanimous, makes the sliding speed of high temperature glass on the workstation unanimous, is favorable to reducing the emergence of the collision condition between high temperature glass, is favorable to reducing the emergence of the collision condition between the gliding high temperature glass on the workstation.

In a specific implementation mode, the clamping piece comprises a connecting block fixedly connected with the synchronous belt and a clamping plate slidably connected with the connecting block, and a second driving component for driving the clamping plate to slide along the direction perpendicular to the moving direction of the high-temperature glass is arranged on the connecting block; the clamping plate is pushed to the end face attached to the high-temperature glass through the second driving assembly.

Through adopting above-mentioned technical scheme, when needing to support and push away the high temperature glass removal, two drive assembly drive grip blocks roll-off and centre gripping high temperature glass slip from the connecting block, when not needing centre gripping high temperature glass removal, two drive assembly grip blocks retract in the connecting block, have realized the slip of grip block on the connecting block, can reduce the grip block and push up the emergence of the condition from the workstation with high temperature glass when moving to synchronous pulley group top.

In a specific implementation scheme, the second driving assembly comprises a second motor arranged on the connecting block, and a second gear is coaxially and fixedly connected to a driving end of the second motor; the clamping plate is provided with a rack, the rack is parallel to the sliding direction of the clamping plate, and the second gear is meshed with the rack.

Through adopting above-mentioned technical scheme, realized the grip block and slided on the connecting block fast, can reduce the grip block and move the emergence of the condition of leaving the workstation with high temperature glass top when synchronous pulley group top.

In a specific possible implementation scheme, a plurality of air inlet boxes are arranged on the air grid, a plurality of air blowing holes are formed in the end faces, facing the high-temperature glass, of the air inlet boxes, a wind collecting cover externally connected with an air source is connected to one side of each air inlet box, and the sectional areas of the air inlet boxes are gradually reduced along the direction far away from the wind collecting cover.

Through adopting above-mentioned technical scheme for the wind speed when cold air blows off from each blow-empty hole in the inlet box tends to unanimous, and then has made the regional everywhere instantaneous cooling efficiency that high temperature glass surface was blown by same inlet box tend to unanimous, has promoted the cooling degree of consistency of high temperature glass lower surface, is favorable to reducing the formation of toughened glass surface stress spot, has improved toughened glass's aesthetic property.

In a specific embodiment, the outer side of the workbench is covered with a wind box, and the wind box is provided with a feed inlet for leading in high-temperature glass and a discharge outlet for leading out the high-temperature glass.

Through adopting above-mentioned technical scheme, high temperature glass slides to the workstation by the feed inlet on, is shifted out by the discharge gate after the cooling is accomplished, and bellows provides a relatively inclosed space for the forced air cooling of high temperature glass on the workstation, is favorable to reducing the influence of surrounding environment to the forced air cooling effect, has promoted the cooling efficiency of air grid to high temperature glass.

In a specific implementation scheme, an air draft window is formed in the side wall of the air bellow, an air draft cover is arranged on the outer side of the air draft window in a covering mode, and an air draft pipe used for exhausting air is arranged on the air draft cover.

Through adopting above-mentioned technical scheme, the exhaust column takes out the intensification air after cooling high temperature glass in with bellows, is favorable to reducing the air temperature in the bellows for the circulation of the cold air in the bellows that the air grid blew off has promoted the cooling efficiency of air grid to high temperature glass.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the universal ball, the fluidity of cold air blown out by the air grid below the workbench on the lower surface of the high-temperature glass is improved, the instantaneous cooling area of the lower surface of the high-temperature glass is increased, the cooling uniformity of the lower surface of the high-temperature glass is improved, the formation of stress spots on the surface of the toughened glass is favorably reduced, and the attractiveness of the toughened glass is improved;

2. by arranging the clamping piece and the first driving assembly, sliding cooling and automatic conveying of the high-temperature glass are realized, the cooling uniformity of the surface of the high-temperature glass is favorably improved, and the production efficiency of toughened glass is improved;

3. through setting up bellows, draught hood and exhaust column, be favorable to promoting the air grid to high temperature glass's cooling efficiency.

Drawings

FIG. 1 is a schematic view of an embodiment of the present application for showing an internal structure of a wind grid quenching apparatus for tempered glass production.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a partial sectional view of a first embodiment of the present invention for embodying a wind fence and a motor.

Fig. 4 is a partially enlarged schematic view of a portion B in fig. 1.

FIG. 5 is a schematic structural diagram of the whole air grid quenching device for producing tempered glass according to the embodiment of the present application.

Reference number description, 1, table; 11. mounting grooves; 12. a ball transfer unit; 13. a load-bearing wheel; 2. a wind grid; 21. an air inlet box; 211. a tuyere; 2111. an air blowing hole; 3. a wind collecting cover; 4. a first driving component; 41. a synchronous pulley set; 411. a synchronizing wheel; 412. a synchronous belt; 42. a clamping member; 421. connecting blocks; 4211. a sliding groove; 422. a clamping plate; 4221. a through groove; 423. a rack; 43. a synchronization lever; 431. a first gear; 44. a first motor; 441. a second gear; 5. a second driving component; 51. a second motor; 52. a third gear; 6. a bellows; 61. a feed inlet; 62. a discharge port; 63. an air exhaust window; 7. a closing plate; 8. an air draft hood; 81. an exhaust pipe; 9. a support bar; 10. a connecting rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses air grid quenching device for toughened glass production.

Referring to fig. 1 and 2, the air grid 2 quenching device for toughened glass production comprises a workbench 1, wherein a plurality of mounting grooves 11 are arranged in a hollow manner in the table top of the workbench 1, a plurality of universal balls 12 are fixedly connected to the table top of the workbench 1, a horizontal bearing surface is formed by the top ends of the universal balls 12, high-temperature glass is borne by the universal balls 12 in a rolling manner, the high-temperature glass is borne by the universal balls 12 in a sliding manner, air grids 2 are arranged above and below the table top of the workbench 1, and the air grids 2 continuously blow air to the surface of the high-temperature glass for cooling; the workbench 1 is also provided with a first driving assembly 4, and the first driving assembly 4 drives the high-temperature glass to move on the workbench 1 and complete air cooling. In the process of carrying out forced air cooling to high temperature glass, high temperature glass's lower surface and universal ball 12's contact mode are the point contact all the time for the mobility at the high temperature glass lower surface of the cold air that is located the air grid 2 below workstation 1 and blows out obtains promoting, has increased the instantaneous cooling area of high temperature glass lower surface, has promoted the cooling degree of consistency of high temperature glass lower surface, is favorable to reducing the formation of toughened glass surface stress spot, has improved toughened glass's aesthetic property.

Referring to fig. 1 and 3, the same side of each air grid 2 is fixedly connected with an air collecting cover 3 externally connected with a cold air source, each air grid 2 is provided with two air collecting covers 3, each air grid 2 comprises a plurality of air inlet boxes 6 arranged in parallel along the moving direction of the high-temperature glass, the sectional area of each air inlet box 21 in the direction far away from the air collecting cover 3 is gradually reduced, one surface of each air inlet box 21 facing the high-temperature glass is provided with an air nozzle 211, and the end surface of each air nozzle 211 facing the high-temperature glass is provided with a plurality of air blowing holes 2111;

the tuyere 211 of the air grid 2 below the workbench 1 is embedded into the mounting groove 11 of the workbench 1, the air grid 2 blows towards the surface of the high-temperature glass through the tuyere 211 to perform quenching work, the sectional area of the air inlet box 21 in the direction far away from the air collecting cover 3 is gradually reduced to enable the wind speed of cold air in the air inlet box 21 to be consistent when the cold air is blown out from each blowing hole, so that the instantaneous cooling efficiency of each part of the area blown by the same air inlet box 21 on the surface of the high-temperature glass tends to be consistent, the cooling uniformity of the lower surface of the high-temperature glass is improved, the formation of stress spots on the surface of the toughened glass is facilitated to be reduced, and the attractiveness of the toughened glass is improved.

Referring to fig. 1 and 3, the first driving assembly 4 includes two synchronous pulley sets 41, the two synchronous pulley sets 41 are disposed on opposite sides of the worktable 1 in a one-to-one correspondence manner, each synchronous pulley set 41 includes a pair of synchronous pulleys 411 rotatably connected to the worktable 1, each pair of synchronous pulleys 411 are sequentially disposed along the moving direction of the high temperature glass, each pair of synchronous pulleys 411 is drivingly connected to a synchronous belt 412, and a plurality of clamping members 42 for clamping the high temperature glass to move are sequentially and fixedly connected to a bearing surface of the synchronous belt 412;

the synchronous wheels 411 of the two groups of synchronous wheel sets 41 are arranged oppositely one by one, a synchronous rod 43 is coaxially and fixedly connected between the two opposite synchronous wheels 411, a first gear 431 is coaxially and fixedly connected with the synchronous rod 43, a first motor 44 is fixedly connected to the position, close to the first gear 431, of the workbench 1, a second gear 441 is coaxially and fixedly connected to the driving end of the first motor 44, and the first gear 431 is meshed with the second gear 441;

when the air grid 2 quenching device for producing toughened glass quenches high-temperature glass on the workbench 1, the driving end of the motor I44 rotates and drives the synchronizing rod 43 to rotate, so as to drive the synchronizing wheels 411 at two ends of the synchronizing rod 43 to rotate, the two synchronizing wheels 411 drive the two synchronizing belts 412 to move synchronously, and the synchronizing belts 412 drive the clamping piece 42 to clamp the high-temperature glass on the workbench 1 to move and finish air cooling.

The first driving assembly 4 provides power for the clamping piece 42 to clamp the high-temperature glass to slide on the workbench 1, so that sliding cooling and automatic transmission of the high-temperature glass are realized, the cooling uniformity of the surface of the high-temperature glass is favorably improved, and the production efficiency of toughened glass is improved; meanwhile, the synchronous rods 43 enable the conveying speeds of the two synchronous belts 412 to be consistent, and further enable the moving speeds of the clamping pieces 42 to be consistent, so that the sliding speeds of the high-temperature glass on the workbench 1 are consistent, and the collision between the high-temperature glass is favorably reduced.

Referring to fig. 1 and 4, the clamping member 42 includes connecting blocks 421 fixedly connected to the carrying surface of the synchronous belt 412, the connecting blocks 421 on the same synchronous belt 412 are arranged at equal intervals, the connecting blocks 421 on the two synchronous belts 412 are arranged in one-to-one correspondence, a sliding groove 4211 is formed in the connecting block 421, a clamping plate 422 is slidably connected in the sliding groove 4211, the sliding direction of the clamping plate 422 is perpendicular to the moving direction of the high-temperature glass, a through groove 4221 is formed in the plate surface of the clamping plate 422, the length direction of the through groove 4221 is perpendicular to the traveling direction of the high-temperature glass, and a rack 423 is arranged on the inner top wall of the clamping plate 422 located on the through groove 4221;

a second driving assembly 5 for driving the clamping plate 422 to slide along the direction perpendicular to the moving direction of the high-temperature glass is arranged on the connecting block 421, the second driving assembly 5 comprises a second motor 51 fixedly connected to the end face, away from the high-temperature glass, of the connecting block 421, the driving end of the second motor 51 is coaxially and fixedly connected with a third gear 52, the third gear 52 extends into the through groove 4221 and is meshed with the rack 423, the connecting block 421 and the clamping plate 422 move along with the step belt 412, when the second motor 51 moves to the top surface of the synchronous belt 412, the third gear 52 and the rack 423 drive the clamping plate 422 to slide out from the connecting block 421 towards the high-temperature glass, and the clamping plates 422 opposite to one another on the two synchronous belts 412 abut against two ends of the high-temperature glass and drive the high-temperature glass to move; when the connecting block 421 and the clamping plate 422 leave the top surface of the synchronous pulley set 41, the second motor 51 drives the clamping plate 422 to move away from the high-temperature glass through the third gear 52 and the rack 423 and to slide and retract into the connecting block 421.

Connecting block 421 sliding connection grip block 422, two 5 fixed connection drive assembly have realized that grip block 422 slides on connecting block 421 fast, can reduce the grip block 422 and move the emergence of the condition of carrying high temperature glass off-table 1 when synchronous pulley group 41 top, and the grip block 422 one-to-one on two hold-in ranges 412 sets up and makes a plurality ofly more firm to grip block 422 to high temperature glass's centre gripping.

Referring to fig. 1 and 2, bearing wheels 13 are rotatably connected to two outer side surfaces of the worktable 1 parallel to the moving direction of the high temperature glass, the bearing wheels 13 are located in the synchronous belt 412 and support the synchronous belt 412 along the length direction of the synchronous belt 412, and the bearing wheels 13 are sequentially and uniformly arranged in the synchronous belt 412 along the length direction of the synchronous belt 412. In the embodiment, the number of the bearing wheels 13 on each outer side surface is set to be 7, and in other embodiments, the number of the bearing wheels 13 can be flexibly increased or decreased according to the length of the transmission belt. The axle center of bearing wheel 13 is on a parallel with the axle center of synchronizing wheel 411, and bearing wheel 13 makes the top surface of hold-in range 412 keep the level for a plurality of pairs of grip blocks 422 on two hold-in ranges 412 are more stable to the centre gripping of high temperature glass.

Referring to fig. 5, the outer side of the workbench 1 is covered with a bellows 6, two side surfaces of the workbench 1 are respectively and fixedly connected with L-shaped support rods 9, in this embodiment, the number of the support rods 9 on the two side surfaces is respectively set to 2, and in other embodiments, the number of the support rods 9 can be flexibly increased or decreased according to the weight of the workbench 1. The common fixedly connected with closing plate 7 of one end that bracing piece 9 deviates from 1 mesa of workstation, 6 lids of bellows close on closing plate 7, air grid 2, actuating mechanism is all covered and is established in bellows 6, the top fixedly connected with connecting rod 10 of the air grid 2 that is located 1 top of workstation, the quantity of connecting rod 10 sets up to 4 in this embodiment, the air grid 2 that is located 1 top of workstation passes through connecting

rod

10 and 6 fixed connection of bellows, feed inlet 61 and discharge gate 62 have been seted up to the both sides wall one-to-one of 6 perpendicular to high temperature glass moving direction of bellows, high temperature glass is conveyed to workstation 1 along feed inlet 61, derive from discharge gate 62 by grip block 422 after the forced air cooling. The bellows 6 provides a relatively closed space for air cooling of the high-temperature glass on the workbench 1, and is beneficial to reducing the influence of the surrounding environment on the air cooling effect.

An air draft window 63 is formed in the side wall, away from the air collecting cover 3, of the air box 6, an air draft cover 8 is circumferentially covered at the position, located at the air draft window 63, of the air box 6, and an air draft pipe 81 is connected to the air draft cover 8. The temperature of the cold air blown out of the air grid 2 is increased after the cold air cools the high-temperature glass, and the air heated by the exhaust pipe 81 is exhausted, so that the temperature of the air in the air box 6 is favorably reduced, the circulation of the cold air blown out of the air grid 2 in the air box 6 is accelerated, and the cooling efficiency of the air grid 2 on the high-temperature glass is improved.

The implementation principle of the air grid 2 quenching device for producing the toughened glass is as follows: the high-temperature glass moves to the workbench 1 from the feeding hole 61 of the bellows 6, the universal balls 12 support the high-temperature glass, the first motor 44 rotates and drives the synchronizing rod 43 to rotate through the first gear 431 and the second gear 441, the synchronizing rod 43 drives the synchronizing wheels 411 at two ends to rotate and further drives the two synchronous belts 412 to transmit, the synchronous belts 412 drive the connecting block 421 and the clamping plates 422 to move, when the connecting block 421 moves to the top end of the synchronous belts 412, the second motor 51 rotates and drives the clamping plates 422 to slide out of the connecting block 421 through the third gear 52 and the rack 423, a plurality of pairs of clamping plates 422 on the two synchronous belts 412 support the high-temperature glass tightly and drive the high-temperature glass to move towards the discharging hole 62, when the connecting block 421 is separated from the top end of the synchronous belts 412, the second motor 51 rotates and drives the clamping plates 422 to separate from the high-temperature glass and retract into the connecting block 421, and the high-temperature glass moves out of the discharging hole 62 under the inertia effect;

in the process that the high-temperature glass moves from the feeding hole 61 to the discharging hole 62, the air grid 2 continuously blows air to cool the high-temperature glass, the air absorbing the heat of the high-temperature glass is sucked into the air draft cover 8 through the air draft window 63 and is exhausted along the air draft pipe 81, and the cold air continuously circulates in the air box 6 and finishes quenching of the high-temperature glass.

The embodiments of the present invention are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a toughened glass production is with air grid (2) quenching device which characterized in that: the high-temperature glass supporting device comprises a workbench (1), wherein a plurality of universal balls (12) used for supporting high-temperature glass are arranged on the workbench (1), air grids (2) used for blowing air towards the high-temperature glass are arranged on the top surface and the bottom surface of the workbench (1), and a first driving assembly (4) used for driving the high-temperature glass to move and completing air cooling is arranged on the workbench (1).

2. The air grid (2) quenching device for producing tempered glass according to claim 1, wherein: the first driving assembly (4) comprises two groups of synchronous pulley sets (41), and the two groups of synchronous pulley sets (41) are correspondingly arranged on two opposite sides of the workbench (1) one by one;

the synchronous pulley set (41) comprises a pair of synchronous pulleys (411) which are rotatably connected with the workbench (1), the pair of synchronous pulleys (411) are sequentially arranged along the moving direction of the high-temperature glass, the pair of synchronous pulleys (411) is in transmission connection with a synchronous belt (412), and a first motor (44) for driving the synchronous pulleys (411) to rotate is arranged on the workbench (1);

the synchronous belt (412) is connected with a clamping piece (42) used for clamping high-temperature glass.

3. The air grid (2) quenching device for producing tempered glass as claimed in claim 2, wherein: synchronizing wheels (411) of the two groups of synchronizing wheel sets (41) are opposite one by one, and the two groups of synchronizing wheels are opposite to the synchronizing wheels (411) and are coaxially and fixedly connected with synchronizing rods (43).

4. The air grid (2) quenching device for producing tempered glass as claimed in claim 2, wherein: the clamping piece (42) comprises a connecting block (421) fixedly connected with the synchronous belt (412) and a clamping plate (422) connected with the connecting block (421) in a sliding manner, and a second driving assembly (5) used for driving the clamping plate (422) to slide along the direction perpendicular to the moving direction of the high-temperature glass is arranged on the connecting block (421);

and the clamping plate (422) is pushed to the end face attached to the high-temperature glass by the second driving assembly (5).

5. The air grid (2) quenching device for producing tempered glass according to claim 4, wherein: the second driving assembly (5) comprises a second motor (51) arranged on the connecting block (421), and a second gear (441) is fixedly connected with the driving end of the second motor (51) coaxially;

the clamping plate (422) is provided with a rack (423), the rack (423) is parallel to the sliding direction of the clamping plate (422), and the second gear (441) is meshed with the rack (423).

6. The air grid (2) quenching device for producing tempered glass according to claim 1, wherein: the air grid (2) is provided with a plurality of air inlet boxes (21), a plurality of air blowing holes (2111) are formed in the end faces, facing the high-temperature glass, of the air inlet boxes (21), one sides of the air inlet boxes (21) are connected with air collecting covers (3) of external air sources, and the sectional areas of the air inlet boxes (21) in the direction far away from the air collecting covers (3) are gradually reduced.

7. The air grid (2) quenching device for producing tempered glass according to claim 1, wherein: the outside cover of workstation (1) is equipped with bellows (6), set up feed inlet (61) that high temperature glass is leading-in and discharge gate (62) that high temperature glass derives on bellows (6).

8. The air grid (2) quenching device for producing tempered glass according to claim 7, wherein: air extraction window (63) have been seted up on bellows (6) lateral wall, bellows (6) are located the outside cover of air extraction window (63) is equipped with exhaust hood (8), be provided with exhaust column (81) that are used for bleeding on exhaust hood (8).