阅读说明：本技术 一种自动清扫粉尘的匣钵输送线体 (Automatic clean casket-like bowl conveying line body of dust ) 是由 何易鹏 龚杰洪 谢礼飞 芦靖宇 王建业 宋晓峰 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种自动清扫粉尘的匣钵输送线体,包括第一侧框架、第二侧框架、接尘台、传送机构、扫地机器人和存储充电装置,传送机构包括辊轴组和辊轴动力单元,辊轴组的两端分别安装在第一侧框架和第二侧框架上,所接尘台包括接尘底板和设于接尘底板两侧的接尘侧板,两个接尘侧板分别安装在第一侧框架和第二侧框架上,所述扫地机器人活动于接尘底板上,存储充电装置包括存储舱和自动充电器,存储舱与接尘侧板之间设有可供扫地机器人进出存储舱的进出口,自动充电器设于存储舱内。本发明首次提出配合使用扫地机器人而特制的匣钵输送线体结构,解决了行业内粉尘需要人工清理的问题。(The invention discloses a sagger conveyor line body capable of automatically cleaning dust, which comprises a first side frame, a second side frame, a dust receiving table, a conveying mechanism, a sweeping robot and a storage and charging device, wherein the conveying mechanism comprises a roller shaft group and a roller shaft power unit, two ends of the roller shaft group are respectively installed on the first side frame and the second side frame, the dust receiving table comprises a dust receiving bottom plate and dust receiving side plates arranged on two sides of the dust receiving bottom plate, the two dust receiving side plates are respectively installed on the first side frame and the second side frame, the sweeping robot moves on the dust receiving bottom plate, the storage and charging device comprises a storage cabin and an automatic charger, an inlet and an outlet for the sweeping robot to enter and exit the storage cabin are arranged between the storage cabin and the dust receiving side plates, and the automatic charger is arranged in the storage cabin. The invention provides a sagger conveyor line body structure specially made by matching with a sweeping robot for the first time, and solves the problem that dust in the industry needs to be cleaned manually.)

1. The utility model provides an automatic clean sagger transfer line body of dust which characterized in that: including first side frame (1), second side frame (2), connect dirt platform (3), transport mechanism (4), robot (5) and the storage charging device (6) of sweeping the floor, transport mechanism (4) include roller group (41) and drive roller group (41) pivoted roller power pack (42), install respectively on first side frame (1) and second side frame (2) at the both ends of roller group (41), connect dirt platform (3) including connect dirt bottom plate (31) and locate connect dirt curb plate (32) of dirt bottom plate (31) both sides, two connect dirt curb plate (32) to install respectively on first side frame (1) and second side frame (2), robot (5) of sweeping the floor moves about on connecing dirt bottom plate (31), storage charging device (6) include storage cabin (61) and automatic charger (62), storage cabin (61) are installed in the outside that connects dirt curb plate (32), and an inlet and an outlet for the sweeping robot (5) to enter and exit the storage cabin (61) are arranged between the storage cabin (61) and the dust collecting side plate (32), and the automatic charger (62) is arranged in the storage cabin (61).

2. The sagger conveyor line body for automatically cleaning dust according to claim 1, wherein: transport mechanism (4) still include the avoiding roller group (43) of robot (5) of sweeping the floor of being convenient for take out, avoiding roller group (43) including at least a pair of roller (431) of dodging, every two dodge roller (431) mutual disposition and be equipped with the clearance between the two, dodge roller (431) outwards one end install on first side frame (1) or second side frame (2), inwards one end be equipped with support casket-like bowl (7) dodge running roller (432).

3. The sagger conveyor line body for automatically cleaning dust according to claim 2, wherein: the roller shaft group (41) comprises a plurality of roller shafts (411), and each roller shaft (411) is provided with two rollers (412) for supporting the saggars (7).

4. The automatic dust-cleaning sagger conveyor line body according to claim 3, wherein: roller power pack (42) are installed on first side frame (1), roller power pack (42) include motor, main chain wheel, inferior main chain wheel (421), main chain (422), follow chain (423) and a plurality of from sprocket (424), and the one end that every roller (411) is close to first side frame (1) is equipped with one from sprocket (424), and the roller (431) of dodging established on first side frame (1) one end outwards is equipped with one from sprocket (424), from chain (423) around establishing on each from sprocket (424), inferior main chain wheel (421) are located on one of them roller (411), main chain wheel and motor output shaft, main chain (422) are around establishing on main chain wheel and inferior main chain wheel (421).

5. The automatic dust-cleaning sagger conveyor line body according to claim 4, wherein: bearing seats (44) are arranged between the roller shaft (411) and the first side frame (1) and the second side frame (2), and bearing seats (44) are arranged between the avoiding roller shaft (431) and the first side frame (1) or the second side frame (2).

6. The automatic dust-cleaning sagger conveyor line body according to claim 5, wherein: the chain cover is characterized in that a chain cover box (45) is arranged on the side portion of the first side frame (1), a first closed area (46) is formed by the chain cover box (45) and the first side frame (1) in a surrounding mode, the motor, the main chain wheel, the secondary main chain wheel (421), the main chain (422), the secondary chain wheel (423) and the multiple secondary chain wheels (424) are arranged in the first closed area (46), a chain cover plate (47) is arranged on the side portion of the second side frame (2), a second closed area (48) is formed by the chain cover plate (47) and the second side frame (2) in a surrounding mode, and a bearing seat (44) on one side of the second side frame (2) is arranged in the second closed area (48).

7. The automatic dust-cleaning sagger conveyor line body according to any one of claims 1 to 6, wherein: the storage compartment (61) is provided with a compartment door (611).

8. The automatic dust-cleaning sagger conveyor line body according to any one of claims 1 to 6, wherein: and a sagger cleaning brush (51) for cleaning the bottom surface of the sagger (7) is arranged at the top of the sweeping robot (5).

9. The automatic dust-cleaning sagger conveyor line body according to any one of claims 1 to 6, wherein: the conveying line body further comprises a guide mechanism (8) used for positioning the saggar (7), the guide mechanism (8) comprises two guide frames (81) and two groups of guide wheels (82), one guide frame (81) is installed on the first side frame (1), the other guide frame (81) is installed on the second side frame (2), each group of guide wheels (82) is installed on the corresponding guide frame (81), each group of guide wheels (82) comprises a plurality of guide wheels (82) which are arranged at intervals along the conveying direction of the saggar (7), and the axes of the guide wheels (82) are arranged vertically.

10. The automatic dust-cleaning sagger conveyor line body according to any one of claims 1 to 6, wherein: connect dirt platform (3) to set up a plurality ofly, a plurality ofly connect dirt platform (3) to dock in proper order, connect through buckle formula structural connection between two adjacent dirt platforms (3), buckle formula structure connects joint chair (33) of dirt bottom plate (31) tail end and sets up cardboard (34) that connect dirt bottom plate (31) head end at one back including setting up one in the front, joint chair (33) are equipped with opening U-shaped groove (331) up, cardboard (34) card is located in U-shaped groove (331).

Technical Field

The invention relates to lithium battery material sintering equipment, in particular to a sagger conveyor line body capable of automatically cleaning dust.

Background

The automatic feeding and discharging system is used as key equipment for completing a sintering process and a circulation function in cooperation with a lithium battery material sintering furnace, so that the cost can be saved to the maximum extent, the labor is reduced, and the like. However, with the continuous development of the industry, the automation of the equipment is not only embodied in realizing certain functions, but also needs to better solve the problem of dust caused by automation.

The sagger used for a long time is difficult to bond powder on the side wall and the bottom of the sagger, when the cover plate is arranged above the sagger, the powder is easy to adhere to the cover plate, and the powder is accumulated on the ash receiving plate/ash receiving box in the conveying line body due to the jolt of the conveying line body in the conveying process of the sagger.

The line body is the longest, and the highest part of repeatability, the clean volume of dust is big, and because the influence of the inside complex construction roller of line body, ceramic wheel etc. for the clean complex operation of manual work is just can't be thorough. And because the repetition degree of the line body is higher, higher working efficiency is brought to the work of the sweeping robot.

Traditional clearance mode mainly has two kinds, firstly concentrates the interior dust of line body through connecing the ash box, then the clearance, but this type of mode can't collect to partial dead angle region. Secondly, the dust is received through a dust receiving plate, and then the dust is manually cleaned in modes of negative pressure dust extraction and the like. These methods all require manual operation. And the cleaning work operation is complicated and cannot be thorough due to the complex structure in the wire body.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a sagger conveyor line body structure specially made by matching with a sweeping robot, and solves the problem that dust in the industry needs to be cleaned manually.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides an automatic clean sagger transfer line body of dust, includes first side frame, second side frame, connects dirt platform, transport mechanism, robot and the storage charging device of sweeping the floor, transport mechanism includes roller group and driving roller group pivoted roller power pack, install respectively on first side frame and second side frame at the both ends of roller group, connect the dirt platform including connect the dirt bottom plate and locate the dust collecting side board that connects dirt bottom plate both sides, two dust collecting side boards are installed respectively on first side frame and second side frame, the robot activity of sweeping the floor is on connecing the dirt bottom plate, storage charging device includes storage cabin and automatic charger, the storage cabin is installed in one and is connect the outside of dirt side board, and storage cabin and connect to be equipped with the exit that can supply the robot of sweeping the floor to pass in and out the storage cabin between the dirt side board, automatic charger locates the storage cabin.

As a further improvement of the above technical solution:

transport mechanism still includes the avoiding roller group of being convenient for take out the robot of sweeping the floor, avoid the roller group including at least a pair of roller of dodging, every to dodging two roller mutual dispositions and be equipped with the clearance between the two, it installs on first side frame or second side frame, inwards one end is equipped with the running roller of dodging that supports the casket-like bowl to dodge the roller of roller outwards.

The roller shaft group comprises a plurality of roller shafts, and each roller shaft is provided with two rollers for supporting the saggars.

Roller power pack installs on first side frame, roller power pack includes motor, leading sprocket, inferior leading sprocket, main chain, follows chain and a plurality of sprocket from, and the one end that every roller is close to first side frame is equipped with one from the sprocket, establishes the one end of dodging the roller outwards on first side frame and is equipped with one from the sprocket, from the chain around establishing on each from the sprocket, inferior leading sprocket locates on one of them roller, leading sprocket and motor output shaft, main chain is around establishing on leading sprocket and inferior leading sprocket.

Bearing seats are arranged between the roll shaft and the first side frame and between the roll shaft and the second side frame, and bearing seats are arranged between the avoidance roll shaft and the first side frame or between the avoidance roll shaft and the second side frame.

The chain cover box is arranged on the side portion of the first side frame, a first closed area is defined by the chain cover box and the first side frame, the motor, the main chain wheel, the secondary main chain wheel, the main chain, the secondary chain and the plurality of secondary chain wheels are arranged in the first closed area, the chain cover plate is arranged on the side portion of the second side frame, a second closed area is defined by the chain cover plate and the second side frame, and the bearing seat on the side of the second side frame is arranged in the second closed area.

The storage cabin is provided with a cabin door.

And a sagger cleaning brush for cleaning the bottom surface of the sagger is arranged at the top of the sweeping robot.

The conveying line body further comprises a guide mechanism used for positioning the saggars, the guide mechanism comprises two guide frames and two groups of guide wheels, one guide frame is installed on the first side frame, the other guide frame is installed on the second side frame, each group of guide wheels are installed on the corresponding guide frame, each group of guide wheels comprise a plurality of guide wheels arranged at intervals along the conveying direction of the saggars, and the axes of the guide wheels are vertically arranged.

Connect the dirt platform to set up a plurality ofly, a plurality ofly connect the dirt platform to dock in proper order, connect through buckle formula structural connection between the dirt platform for two adjacent, buckle formula structure is including setting up the joint seat that connects the dirt bottom plate tail end in the front and setting up the cardboard that connects the dirt bottom plate head end in the back, the joint seat is equipped with the U-shaped groove that the opening is up, the U-shaped inslot is located to the cardboard card. Compared with the prior art, the invention has the advantages that:

according to the sagger conveyor line body capable of automatically cleaning dust, the structure of the existing sagger conveyor line body is improved, the dust collecting table is designed to be a semi-closed structure, on one hand, the dust collecting side plates are connected with the first side frame 1 and the second side frame, so that dust can only fall on the dust collecting bottom plate, dust can not be raised all around to pollute the environment, on the other hand, enough space is reserved in the dust collecting table to be convenient for a sweeping robot to pass through, and meanwhile, the storage and charging device is designed to prevent the sweeping robot from being incapable of continuously walking and being fussy in the process of taking out and putting in the sweeping robot due to the problem of electric quantity or fault in the using process. The invention provides a sagger conveyor line body structure specially made by matching with a sweeping robot and a use mode of the sweeping robot in a sagger automatic loading and unloading system for the first time, and aims to solve the problem that dust in the industry needs to be manually cleaned.

Drawings

Fig. 1 is a schematic cross-sectional view of a sagger conveyor line for automatically cleaning dust according to the present invention.

Fig. 2 is a schematic top view of the automatic dust-cleaning sagger conveyor according to the present invention.

Fig. 3 is a side schematic view of a first side frame of the present invention.

Fig. 4 is a side schematic view of a second side frame of the present invention.

Fig. 5 is an enlarged view of fig. 1 at a.

FIG. 6 is a schematic perspective view of two dust-receiving tables according to the present invention.

FIG. 7 is a schematic front view of two dust-collecting tables according to the present invention.

Fig. 8 is a schematic structural view of the sweeping robot and the sagger cleaning brush according to the present invention.

The reference numerals in the figures denote:

1. a first side frame; 2. a second side frame; 3. a dust collecting table; 31. a dust collecting bottom plate; 32. a dust collecting side plate; 33. a clamping seat; 331. a U-shaped groove; 34. clamping a plate; 4. a transport mechanism; 41. a roller shaft group; 411. a roll shaft; 412. a roller; 42. a roll shaft power unit; 421. a secondary main sprocket; 422. a main chain; 423. a slave chain; 424. a slave sprocket; 43. avoiding the roller shaft group; 431. avoiding the roll shaft; 432. avoiding rollers; 44. a bearing seat; 45. a chain cover box; 46. a first enclosed area; 47. a chain guard plate; 48. a second enclosed area; 49. a bolt assembly; 5. a sweeping robot; 51. a sagger cleaning brush; 6. a storage charging device; 61. a storage compartment; 611. a cabin door; 62. an automatic charger; 8. a guide mechanism; 81. a guide frame; 82. a guide wheel; 83. and (7) bending the plate.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

As shown in fig. 1 to 7, the sagger conveyor line for automatically cleaning dust of this embodiment includes a first side frame 1, a second side frame 2, a dust receiving platform 3, a conveying mechanism 4, a sweeping robot 5 and a storage charging device 6, where the conveying mechanism 4 includes a roller shaft group 41 and a roller shaft power unit 42 for driving the roller shaft group 41 to rotate, two ends of the roller shaft group 41 are respectively installed on the first side frame 1 and the second side frame 2, the dust receiving platform 3 includes a dust receiving bottom plate 31 and dust receiving side plates 32 arranged on two sides of the dust receiving bottom plate 31, the two dust receiving side plates 32 are respectively installed on the first side frame 1 and the second side frame 2, the sweeping robot 5 moves on the dust receiving bottom plate 31, and the dust receiving bottom plate 31 is located right below the roller shaft group 41. The storage charging device 6 comprises a storage compartment 61 and an automatic charger 62, the storage compartment 61 is installed on the outer side of one dust receiving side plate 32, an inlet and an outlet for the sweeping robot 5 to enter and exit the storage compartment 61 are arranged between the storage compartment 61 and the dust receiving side plate 32, and the automatic charger 62 is arranged in the storage compartment 61.

In the use process, the sagger 7 is arranged on the roller shaft group 41, the sagger 7 is driven to move forward by the rolling of the roller shaft group 41, when the sagger 7 runs, powder adhered to the outer wall of the sagger 7 and the cover plate falls to the dust receiving bottom plate 31 below due to bumping, the powder on the dust receiving bottom plate 31 can be automatically cleaned by the sweeping robot 5, the sagger conveying line body automatically cleans dust, the field and equipment cleanliness is guaranteed, and meanwhile, manual operation is reduced. When the sweeping robot 5 is powered off, the robot automatically enters the storage compartment 61 and is in butt joint with the automatic charger 62 in the storage compartment 61 for charging. The length of the storage cabin 61 is matched with that of the dust receiving platform 3, so that the sweeping robot 5 can conveniently enter the storage cabin 61 at any time and any place.

This sagger conveyor line body improves current structure, will connect dirt platform 3 design to semi-enclosed structure, on the one hand connect dirt curb plate 32 and first side frame 1, second side frame 2 is connected, realize that the dust only can drop on connecing dirt bottom plate 31, can not be everywhere raise dust and polluted environment, on the other hand connects and reserves sufficient space in the dirt platform 3 and is convenient for sweep floor robot 5 and pass through, and simultaneously, design storage charging device 6, prevent to sweep floor robot 5 and lead to unable continuation walking and loaded down with trivial details robot 5 of sweeping floor to take out, put into the process because of electric quantity problem or trouble problem in the use. The invention firstly provides a sagger conveyor line body structure specially made by matching with a sweeping robot 5 and a use mode of the sweeping robot in a sagger automatic loading and unloading system, so as to solve the problem that dust in the industry needs to be manually cleaned. Because the height of the sweeping robot 5 is low, the height of the dust collecting platform 3 does not need to be set too high, and the height of the whole conveying line body cannot be influenced.

In this embodiment, the storage compartment 61 is provided with a compartment door 611. The sweeping robot 5 can be conveniently taken out or put in.

In this embodiment, the roller set 41 includes a plurality of rollers 411, and each roller 411 is provided with two rollers 412 for supporting the sagger 7. The roller shaft 411 rotates to drive the roller 412 to rotate, thereby driving the sagger 7 to move forward, and the sagger 7 is supported on the roller 412 to reduce friction of the sagger 7.

The conveying mechanism 4 further comprises an avoiding roller group 43 which is convenient for taking out the sweeping robot 5, the avoiding roller group 43 comprises at least one pair of avoiding rollers 431, each pair of avoiding rollers 431 are oppositely arranged, a gap is arranged between the two avoiding rollers 431, one outwards end of each avoiding roller 431 is arranged on the first side frame 1 or the second side frame 2, and one inwards end of each avoiding roller 431 is provided with an avoiding roller 432 which supports the sagger 7. The width of the sagger 7 is larger than the gap between the two avoiding rollers 432, so that the conveying of the sagger 7 is not influenced.

According to the size of robot 5 of sweeping the floor, in this embodiment, dodge the roller 431 and set up three pairs, respectively dodge and form the regional robot 5 of sweeping the floor for conveniently taking out between the roller 431, robot 5 of sweeping the floor can follow supreme translation down and take out like this, need not overturn the clearance of two roller 411 and take out (this kind of mode need increase the height that connects dirt platform 3, lets robot 5 of sweeping the floor can overturn in connecing dirt platform 3). The avoidance roller set 43 may be disposed at the leading end or the trailing end of the roller set 41 or may be disposed in the middle of the roller set 41.

In this embodiment, the roller shaft power unit 42 is installed on the first side frame 1, and the specific roller shaft power unit 42 includes a motor (not shown), a main sprocket (not shown), a secondary main sprocket 421, a main chain 422, a secondary chain 423 and a plurality of secondary sprockets 424, wherein one end of each roller shaft 411 close to the first side frame 1 is provided with one secondary sprocket 424, one end of each roller shaft 431, which is arranged on the first side frame 1, faces outward is provided with one secondary sprocket 424, the secondary chain 423 is wound on each secondary sprocket 424, the secondary main sprocket 421 is arranged on one of the roller shafts 411, the main sprocket is connected with an output shaft of the motor, and the main chain 422 is wound on the main sprocket and the secondary main sprocket 421. The motor drives the main chain wheel to operate, the main chain 422 rotates, the secondary main chain wheel 421 rotates, the roller shaft 411 connected with the secondary main chain wheel 421 rotates, the secondary chain wheel 424 on the roller shaft 411 rotates, the secondary chain 423 rotates, all the rest secondary chain wheels 424 rotate, and finally all the roller shafts 411 (including the avoiding roller shaft 431 on the first side frame 1) rotate. In this embodiment, the avoidance roller group 43 does not need to be provided with power separately. It should be noted that, in addition to the present embodiment, the escape roller shaft 431 of the second side frame 2 may be independently powered.

In this embodiment, bearing seats 44 are provided between the roller 411 and the first side frame 1 and the second side frame 2, and bearing seats 44 are provided between the escape roller 431 and the first side frame 1 or the second side frame 2. The bearing block 44 is fixed to the first side frame 1 or the second side frame 2 by a bolt assembly 49.

In this embodiment, a chain cover box 45 is provided on a side portion of the first side frame 1, the chain cover box 45 and the first side frame 1 enclose a first enclosed space 46, a motor, a main sprocket, a sub-main sprocket 421, a main chain 422, a sub-chain 423, and a plurality of sub-sprockets 424 are provided in the first enclosed space 46, a chain cover plate 47 is provided on a side portion of the second side frame 2, the chain cover plate 47 and the second side frame 2 enclose a second enclosed space 48, and a bearing seat 44 on the side of the second side frame 2 is provided in the second enclosed space 48. The first enclosure 46 and the second enclosure 48 protect the chain drive from potential safety hazards. In the chain transmission first side frame 1 (the first side frame 1 is the initiative limit, and equipment maintenance is mainly in the initiative limit), consider the security of chain transmission, prevent that operating personnel's hand from stretching into and injuring the hand, also consider the convenience of maintaining simultaneously (need open) set up chain cover box 45 at the initiative limit, and the passive limit need not basically to consider equipment maintenance operation, only considers the security, consequently directly does chain cover board 47.

In this embodiment, the conveyor line body further includes a guide mechanism 8 for positioning the sagger 7, the guide mechanism 8 includes two guide frames 81 and two sets of guide wheels 82, one guide frame 81 is installed on the first side frame 1, another guide frame 81 is installed on the second side frame 2, each set of guide wheels 82 is installed on the corresponding guide frame 81, each set of guide wheels 82 includes a plurality of guide wheels 82 arranged at intervals along the conveying direction of the sagger 7, and the axes of the guide wheels 82 are arranged vertically. When the sagger 7 is conveyed, the side walls on the two sides are in slight contact with the guide wheels 82 on the two sides to generate slight rolling friction, and the guide mechanism 8 is mainly used for guiding the sagger in the conveying process, so that the sagger 7 is prevented from deviating or being blocked. The guide frame 81 has a U-shaped structure to facilitate installation of the guide wheel 82. The guide frame 81 is fixed to the first side frame 1 or the second side frame 2 by a bending plate 83 of about 90 °.

In this embodiment, connect dirt platform 3 two, two connect dirt platform 3 to dock in proper order, connect through buckle formula structural connection between the dirt platform 3 two adjacent, buckle formula structure is including setting up the joint seat 33 that connects the tail end of dirt bottom plate 31 at the front and setting up the cardboard 34 that connects the head end of dirt bottom plate 31 at the back, and joint seat 33 is equipped with the U-shaped groove 331 that the opening is up, and cardboard 34 blocks and locates in U-shaped groove 331. The structure can enable the joint of the two dust collecting tables 3 to be parallel and level, and the sweeping robot 5 can pass through without obstacles. In addition to the present embodiment, the dust receiving table 3 may be an integral one piece, or may be three or more.

In this embodiment, the top of the sweeping robot 5 is provided with a saggar sweeping brush 51 for sweeping the bottom surface of the saggar 7. The sagger cleaning brush 51 is fixedly arranged at the upper part of the sweeping robot 5 and can clean the bottom of the sagger 7.

In practical work, the sagger conveying line is formed by sequentially butting a plurality of sections of conveying line bodies. The dust collecting table 3 between the two sections of line bodies is also connected by adopting the buckle type structure, so that the smoothness of connection between the line bodies after installation is ensured. According to the convenience in the actual use process, the storage and charging device 6 is arranged on only one of the connecting lines. Each section of conveying line body is provided with an avoidance roller shaft group 43, so that the conveying line body can be taken out at any time when in failure.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.