CN215466698U - Battery cell cleaning device and battery cell cleaning equipment with same - Google Patents

Abstract

The utility model relates to a battery cell cleaning device. Including box, conveying subassembly, washing subassembly, lift drive assembly and centre gripping subassembly, wherein: a cleaning station is arranged in the box body; the conveying assembly is used for driving the battery cell to move to the cleaning station along a first preset direction and can stop at a fixed point at the cleaning station; the cleaning assembly is arranged at the cleaning station and comprises a plurality of cleaning heads, and the plurality of cleaning heads are arranged on two sides of the conveying assembly in pairs; the clamping assembly and the lifting driving assembly are arranged at the cleaning station, and the clamping assembly is used for clamping the battery cell driven to the cleaning station by the conveying assembly; the lifting driving component is used for driving the clamping component to move up and down along the direction vertical to the first preset direction. Can drive electric core through centre gripping subassembly and lift drive assembly and go up and down at the washing station to the cooperation is washd the subassembly and is accomplished the washing of electric core surface along the direction of rise and fall, thereby improves the washing area of electric core.

Description

Battery cell cleaning device and battery cell cleaning equipment with same

Technical Field

The utility model relates to the field of automatic production of battery cells, in particular to a battery cell cleaning device and battery cell cleaning equipment with the same.

Background

In the automatic production process of the new energy battery cell, the battery cell material needs to be subjected to plasma cleaning, most of the procedures are manual treatment at present, and the automation degree is low;

partial plasma cleaning device passes the passageway that is equipped with the plasma cleaning head through driving electric core to accomplish the cleaning process of electric core, though can realize automatic washing, the cleaning range is less, is unfavorable for the washing on partial high electric core surface.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a cell cleaning device and a cell cleaning apparatus having the same.

The utility model firstly provides a battery cell cleaning device, which comprises a box body, a conveying assembly, a cleaning assembly, a lifting driving assembly and a clamping assembly, wherein: a cleaning station is arranged in the box body; the conveying assembly is used for driving the battery cell to move to the cleaning station along a first preset direction and can stop at a fixed point at the cleaning station; the cleaning assembly is arranged at the cleaning station and comprises a plurality of cleaning heads, and the plurality of cleaning heads are arranged on two sides of the conveying assembly in pairs; the clamping assembly and the lifting driving assembly are arranged at the cleaning station, and the clamping assembly is used for clamping the battery cell driven to the cleaning station by the conveying assembly; the lifting driving assembly is used for driving the clamping assembly to move up and down along a direction perpendicular to the first preset direction.

Among the above-mentioned electric core belt cleaning device, through being used for driving the conveying subassembly that electric core stopped at the washing station fixed point, the cooperation sets up in the centre gripping subassembly and the lift drive subassembly of washing the station, make electric core can be got and go up and down under the lift drive subassembly drives by the centre gripping subassembly clamp at the washing station, thereby the cooperation sets up the washing that accomplishes electric core surface along lift drive subassembly direction in the washing subassembly of washing the station equally, thereby make the washing area of electric core improve.

In one embodiment, a first loading station and a second loading station are arranged on the conveying assembly, the conveying assembly can move in the forward direction or the reverse direction of the first preset direction, so that the second loading station reaches the cleaning station, and the first loading station is located outside the box body.

So set up, through the motion of conveying subassembly along first predetermined direction for first material loading station is located the washing station with second material loading station in turn, thereby makes electric core when by wasing, can carry out the material loading action of another batch of waiting to wash electric core simultaneously at least, and whole washing beat is compact reasonable, has increased the cleaning efficiency.

In one embodiment, the clamping assembly has a plurality of clamping stations.

In one embodiment, two groups of sliding driving assemblies are further arranged on two sides of the conveying assembly, and the two groups of sliding driving assemblies are respectively used for driving the cleaning heads located on the same side to slide in a reciprocating manner along the first preset direction; each cleaning head corresponds to a plurality of clamping stations, when the lifting driving assembly drives the clamping assembly to ascend to a part of the battery cell to correspond to the cleaning head, the cleaning head moves forward under the driving of the sliding driving assembly to pass through the corresponding plurality of clamping stations; when the lifting driving assembly drives the clamping assembly to descend to the other part of the battery cell and corresponds to the cleaning head, the cleaning head moves reversely under the driving of the sliding driving assembly and passes through the corresponding plurality of clamping stations again.

So set up, at the cleaning head removal in-process, electric core goes up and down to two parts in proper order and the cleaning head corresponds for the reciprocating motion process of cleaning head can wash electric core and the partly that the cleaning head corresponds respectively, makes the cleaning process compacter.

In one embodiment, each slip driving component correspondingly drives at least two cleaning heads.

So set up for the drive assembly that slides drives cleaning head reciprocating motion once, and the total cleaning distance of each cleaning head is the twice of reciprocating motion distance at least, has increased the cleaning efficiency.

In one embodiment, the clamping assembly comprises a first fixed jaw arranged on the lifting driving assembly, a first air cylinder fixed relative to the first fixed jaw, and a first movable jaw fixed at the extending end of the first air cylinder.

So set up, through the concertina movement of first cylinder extension end, can drive first removal claw and be close to relatively/keep away from first stationary dog to make the interval between the two different, with the operation of getting of the clamp of adaptation different specification electricity core, thereby increase the commonality of centre gripping subassembly.

In one embodiment, the conveying assembly includes a plurality of clamps for clamping the battery cells, and each clamp includes a second fixed jaw, a second air cylinder fixed relative to the second fixed jaw, and a second movable jaw fixed to an extended end of the second air cylinder.

So set up, can form a spacing adjustable clamping position between second stationary dog and the second removal claw to the electric core of adaptation different specifications, thereby increased the commonality of anchor clamps.

In one embodiment, an adjusting assembly for adjusting the distance between the cleaning assembly and the conveying assembly is further arranged in the box body, the adjusting assembly comprises an adjusting rod arranged on the box body along a second preset direction and a sliding plate in threaded fit with the adjusting rod, the position of the adjusting rod is fixed relative to the box body, and the cleaning assembly is arranged on the sliding plate.

So set up, through rotating the regulation pole, can make the board that slides and wash the subassembly and predetermine the direction along the second and take place to slide, and then change the distance between washing subassembly and the conveying subassembly, adjust the distance between cleaning head and the electric core promptly to increase the general usefulness of device.

In one embodiment, the cell washing device further includes a controller coupled to the washing assembly, and the controller is configured to output the rotation speed, the washing current, the voltage, and the air pressure of the washing assembly in real time.

The utility model provides a battery cell cleaning device in a second aspect, which comprises the battery cell cleaning device.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic view of the cut-away perspective view at A-A in FIG. 1;

FIG. 3 is a perspective view of the transfer assembly of FIG. 1;

FIG. 4-1 is a schematic view of the transfer assembly shown in a left side view of FIG. 1 in a first operating state;

FIG. 4-2 is a schematic view of the transfer assembly shown in a second operating position with respect to the left side of FIG. 1;

FIGS. 4-3 are schematic views of a third operating state of the transfer assembly shown in the left side view of FIG. 1;

FIGS. 4-4 are schematic views of a fourth operating state of the transfer assembly shown in the left-hand side view of FIG. 1;

FIGS. 4-5 are schematic views of a fifth operating state of the transfer assembly shown in the left side view of FIG. 1;

FIG. 5 is a schematic perspective view of the clamping assembly and the lifting driving assembly shown in FIG. 2;

FIG. 6 is a perspective view of the cleaning assembly of FIG. 1;

FIG. 7-1 is a schematic view of the cleaning assembly of FIG. 1 in a first operational state, as viewed from above;

fig. 7-2 is a schematic view of the cleaning assembly of fig. 1 in a second operating state from the top view.

Description of the main elements

1. A first preset direction; 2. a second preset direction;

100. a box body; 10. a transfer assembly; 110. a first feeding station; 120. a second feeding station; 11. a second stationary jaw; 12. a second cylinder; 13. a second moving claw; 20. cleaning the assembly; 21. a cleaning head; 30. a lift drive assembly; 40. a clamping assembly; 41. a first fixed jaw; 42. a first cylinder; 43. a first moving claw; 50. a slip drive assembly; 60. an adjustment assembly; 61. adjusting a rod; 62. and (4) a sliding plate.

The present invention is described in further detail with reference to the drawings and the detailed description.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The utility model firstly provides a battery cell cleaning device, please refer to fig. 1 and fig. 2, which includes a box 100, a conveying assembly 10 and a cleaning assembly 20, wherein a cleaning station is arranged in the box 100, and the conveying assembly 10 is used for driving a battery cell to move along a first preset direction 1 and can be stopped at a fixed point at the cleaning station. Cleaning assembly 20 sets up in washing station department, and cleaning assembly 20 includes a plurality of cleaning head 21 that set up in conveying assembly 10 both sides in pairs to guarantee to wash simultaneously the both sides surface of electric core.

The battery cell cleaning device further comprises a lifting driving assembly 30 and a clamping assembly 40, wherein the clamping assembly 40 and the lifting driving assembly 30 are arranged at the cleaning station, and the clamping assembly 40 is used for clamping the battery cell driven to the cleaning station by the conveying assembly 10. Lifting drive assembly 30 is used for driving centre gripping subassembly 40 along the first direction elevating movement who predetermines direction 1 of perpendicular to, and then makes electric core drive to washing station department back by transfer assembly 10, can be under lifting and clamping action of lifting drive assembly 30 and centre gripping subassembly 40, along lifting drive assembly 30's direction of lift motion, the cooperation is located the cleaning head 21 that sets up in transfer assembly 10 both sides to it is complete to make electric core surface wash in this direction.

In some embodiments, the first predetermined direction 1 is a horizontal direction, and correspondingly, the lifting driving assembly 30 moves up and down along a vertical direction.

Generally, the diameter of the cleaning head is not very large, and the height of the battery cell in the vertical direction exceeds the diameter of the cleaning head, so that the cleaning area can only reach about 80% in the battery cell cleaning scheme disclosed in the related art. By adopting the battery core cleaning device, the height of the battery core can be not considered by the diameter size of the cleaning head 21, and the battery core is lifted along the height direction through the lifting driving assembly 30 and the clamping assembly 40 so as to cooperate with the cleaning head at the cleaning station, so that the cleaning area of the battery core is increased.

The above-mentioned washing mode through increasing electric core lift step in order to improve electric core washing area in the cleaning process needs transport assembly 10 to stop at the washing station department fixed point to make centre gripping subassembly 40 can take away the electric core that conveys to washing station department, and in electric core lift cleaning process, transport assembly 10 will get into idle state again, puts back to transport assembly 10 until the electric core that washs the completion, and this results in holistic cleaning efficiency to be lower.

Based on this, please refer to fig. 3, a first loading station 110 and a second loading station 120 may be disposed on the conveying assembly 10 of the battery cell cleaning apparatus, and the conveying assembly 10 can move in a forward direction or a reverse direction of the first preset direction 1, so that the second loading station 120 reaches the cleaning station, and the first loading station 110 is located outside the box 100.

Referring to fig. 4, since the conveying assembly 10 has the first loading station 110 and the second loading station 120, when a cell to be cleaned is placed on the conveying assembly 10 for the first time, the cell may be placed on the first loading station 110 located outside the box 100, and then the clamping assembly 40, the lifting driving assembly 30, and the cleaning assembly 20 do not move or move an idle stroke (as shown in fig. 4-1); thereafter, the forward movement of the transfer assembly 10 causes the first loading station 110 to enter the cleaning station in the casing 100 and stop at a fixed point, and the cleaning assembly 20 starts to operate after the cell is removed by the clamping assembly 40, and at the same time, the first loading station 110 is vacated (see fig. 4-2).

The conveying assembly 10 moves reversely to the first loading station 110 to exit from the box 100 (as shown in fig. 4-3); at this time, a new batch of cells to be cleaned may be placed in the first loading station 110 again, and the second loading station 120 returns to the cleaning station, so that the cleaned cells may be placed on the second loading station 120 (see fig. 4-4); after that, the conveying assembly 10 moves forward again to make the first loading station 110 enter the cleaning station in the box 100 and stop at a fixed point, and as the first loading station 110 enters the box 100, the cleaned cells at the second loading station 120 can be removed to complete the discharge, and related devices of the next processing process can also be arranged at a position where the conveying assembly 10 can reach, so that the second loading station 120 can drive the cleaned cells to enter the next processing link to empty the second loading station 120 (as shown in fig. 4-5), and then the above processes are repeated (as shown in fig. 4-3 to fig. 4-5). In the cleaning process, the battery cell can be cleaned at least simultaneously, another batch of feeding actions of the battery cell to be cleaned can be carried out, the whole cleaning beat is compact and reasonable, and the cleaning efficiency can be ensured while the whole surface of the battery cell is thoroughly cleaned. As shown in fig. 5 and fig. 6, the clamping assembly 40 has a plurality of clamping stations for simultaneously clamping a plurality of cells to be cleaned. Referring to fig. 5, in the illustrated embodiment, the clamping assembly 40 includes a first fixed jaw 41 disposed on the elevating driving assembly 30, a first cylinder 42 fixed with respect to the first fixed jaw 41, and a first movable jaw 43 fixed to a protruding end of the first cylinder 42, wherein a clamping position can be formed between the first fixed jaw 41 and the first movable jaw 43 connected thereto by the first cylinder 42. In order to form a plurality of clamping stations, there may be a plurality of sets of the first fixing jaw 41, the first cylinder 42, and the first moving jaw 43. Moreover, since the first fixed claw 41 and the first cylinder 42 are disposed on the lifting driving assembly 30, the first movable claw 43 can be driven to relatively approach/separate from the first fixed claw 41 by the telescopic motion of the extending end of the first cylinder 42, so that the distance between the first fixed claw 41 and the first movable claw is different, and the clamping operation of the battery cells with different specifications is adapted.

Two groups of sliding driving assemblies 50 are further arranged on two sides of the conveying assembly 10, the two groups of sliding driving assemblies 50 are respectively used for driving the cleaning heads 21 located on the same side to slide in a reciprocating mode along the first preset direction 1, and each group of sliding driving assemblies 50 correspondingly drives at least two cleaning heads 21.

The sliding driving assembly 50 is any common bidirectional translation driving mechanism, such as a belt transmission mechanism, a screw nut transmission mechanism, etc., which can be used as the sliding driving assembly 50 in this embodiment, and will not be described herein.

As shown in fig. 6 and 7, each cleaning head 21 corresponds to a plurality of clamping stations, when the lifting driving assembly 30 drives the clamping assembly 40 to move up until a part of the electric core corresponds to the cleaning head 21, the cleaning head 21 moves forward to pass through the corresponding plurality of clamping stations under the driving of the sliding driving assembly 50, and when the lifting driving assembly 30 drives the clamping assembly 40 to move down until another part of the electric core corresponds to the cleaning head 21, the cleaning head 21 moves backward to pass through the corresponding plurality of clamping stations again under the driving of the sliding driving assembly 50.

Referring to fig. 7-1 and 7-2, in the illustrated embodiment, two sets of cleaning heads 21 are provided, one to four battery cells can be sequentially placed on the conveying assembly 10, one set of cleaning heads 21 corresponds to the first and second battery cells, the other set of cleaning heads 21 corresponds to the third and fourth battery cells, the cleaning head diameter of the cleaning head 21 is 60mm, the height of the cleaning surface of the battery cell product opposite to the cleaning head 21 is 120mm, the initial positions of the two sets of cleaning heads 21 are respectively set at the edge positions of the first and third battery cells, when the lifting driving assembly 30 drives the clamping assembly 40 to reach the 60mm area of the lower half of the battery cell corresponding to the cleaning head 21, the two sets of cleaning heads 21 move forward under the driving of the sliding driving assembly 50, one set of cleaning heads 21 moves from the edge of the first battery cell to the edge of the second battery cell, the other set of cleaning heads 21 moves from the edge of the third battery cell to the edge of the fourth battery cell, so far, the lower half part 60mm area of the cleaning surface of the four battery cells is cleaned (as shown in fig. 7-1);

after the washing of electricity core the latter half is accomplished, lift drive assembly 30 drives centre gripping subassembly 40 and descends to the 60mm region of the first half of electricity core and cleaning head 21 and corresponds, the drive assembly 50 that slides drives two sets of cleaning heads 21 reverse migration, a set of cleaning head 21 removes from No. two electricity core edges and washs to an electricity core edge, another cleaning head 21 of group removes from No. four electricity core edges and washs to No. three electricity core edges, two sets of cleaning heads 21 get back to initial position, so far, the regional whole completion of wasing of 120mm that four electricity cores need the cleaning surface (as shown in fig. 7-2).

Like this, every cleaning head 21 corresponds a plurality of centre gripping stations to can remove under the drive of drive assembly 50 that slides and pass through a plurality of centre gripping stations that correspond with it, like this, through removing in-process electric core at cleaning head 21 and go up and down to two parts in proper order and correspond with cleaning head 21 respectively, make a reciprocating motion of cleaning head 21, can accomplish the washing on the upper and lower two parts surface of a plurality of electric cores on a plurality of centre gripping stations, cleaning efficiency is higher.

In some embodiments, cleaning head 21 may be driven by slip drive assembly 50 to move forward after the end surfaces of both cell and cleaning head 21 on the side close to conveyor assembly 10 are flush, and cleaning head 21 may be driven by slip drive assembly 50 to move backward after the end surfaces of both cell and cleaning head 21 on the side away from conveyor assembly 10 are flush.

Referring back to fig. 3, in the illustrated embodiment, the transferring assembly 10 includes a plurality of clamps for clamping the battery cell, each clamp includes a second fixed jaw 11, a second cylinder 12 fixed relative to the second fixed jaw 11, and a second movable jaw 13 fixed to an extended end of the second cylinder 12, so that a clamping position with an adjustable distance is formed between the second fixed jaw 11 and the second movable jaw 13.

The extension end of the second cylinder 12 has different extension distances, so that the distance between the second movable claw 13 and the second fixed claw 11 is different, and the battery cell fixing device is suitable for clamping battery cells of different specifications and does not need to replace different jig fixing battery cells for the battery cells of different specifications.

Referring to fig. 6, an adjusting assembly 60 for adjusting a distance between the cleaning assembly 20 and the conveying assembly 10 is further disposed in the box 100, the adjusting assembly 60 includes an adjusting rod 61 disposed on the box 100 along the second preset direction 2 and a sliding plate 62 in threaded engagement with the adjusting rod 61, the adjusting rod 61 is fixed relative to the box 100, the cleaning assembly 20 is disposed on the sliding plate 62, and the second preset direction 2 is perpendicular to both the first preset direction 1 and a direction of the lifting driving assembly 30.

The adjusting rod 61 is rotated to enable the sliding plate 62 to slide along the second preset direction 2, so as to change the distance between the cleaning assembly 20 and the conveying assembly 10 arranged on the sliding plate 62, i.e. adjust the distance between the cleaning head 21 and the battery cell, thereby increasing the general applicability of the device

In the embodiment provided with the sliding driving assembly 50, the adjusting assembly 60 is disposed on the sliding driving assembly 50, the adjusting rod 61 is disposed on a fixed portion of the sliding driving assembly 50, and the sliding plate 62 is slidably connected to the sliding portion of the sliding driving assembly 50 along the second predetermined direction 2.

The battery cell cleaning device further comprises a controller coupled to the cleaning assembly 20, and the controller is configured to output a rotation speed, a cleaning current, a voltage, and an air pressure signal of the cleaning assembly 20 in real time.

The utility model also provides battery cell cleaning equipment which comprises the battery cell cleaning device in any one of the embodiments.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a battery cell belt cleaning device which characterized in that, includes box (100), conveying component (10), washing subassembly (20), lift drive assembly (30) and centre gripping subassembly (40), wherein:

a cleaning station is arranged in the box body (100);

the conveying assembly (10) is used for driving the battery cell to move to the cleaning station along a first preset direction (1) and can stop at a fixed point at the cleaning station;

the cleaning assembly (20) is arranged at the cleaning station and comprises a plurality of cleaning heads (21), and the cleaning heads (21) are arranged on two sides of the conveying assembly (10) in pairs;

the clamping assembly (40) and the lifting driving assembly (30) are arranged at the cleaning station, and the clamping assembly (40) is used for clamping the battery cell driven to the cleaning station by the conveying assembly (10);

the lifting driving assembly (30) is used for driving the clamping assembly (40) to move in a lifting mode along a direction perpendicular to the first preset direction (1).

2. The battery cell cleaning device according to claim 1, wherein a first loading station (110) and a second loading station (120) are arranged on the conveying assembly (10), the conveying assembly (10) can move in the forward direction or the reverse direction of the first preset direction (1) to enable the second loading station (120) to reach the cleaning station, and the first loading station (110) is located outside the box body (100).

3. The cell washing apparatus according to claim 1, characterized in that the clamping assembly (40) has a plurality of clamping stations.

4. The battery cell cleaning device according to claim 3, wherein two sets of sliding driving assemblies (50) are further disposed on two sides of the conveying assembly (10), and the two sets of sliding driving assemblies (50) are respectively used for driving the cleaning heads (21) located on the same side to slide back and forth along the first preset direction (1);

each cleaning head (21) corresponds to a plurality of clamping stations, when the lifting driving assembly (30) drives the clamping assembly (40) to ascend to a part of the battery core to correspond to the cleaning head (21), the cleaning head (21) moves forwards to pass through the corresponding clamping stations under the driving of the sliding driving assembly (50); when the lifting driving assembly (30) drives the clamping assembly (40) to descend to the other part of the battery cell corresponding to the cleaning head (21), the cleaning head (21) moves reversely under the driving of the sliding driving assembly (50) to pass through the corresponding plurality of clamping stations again.

5. The cell washing apparatus according to claim 4, wherein each of the slip drive assemblies (50) drives at least two of the washing heads (21) correspondingly.

6. The cell cleaning device according to claim 1, wherein the clamping assembly (40) comprises a first fixed jaw (41) disposed on the lifting driving assembly (30), a first air cylinder (42) fixed relative to the first fixed jaw (41), and a first movable jaw (43) fixed to an extending end of the first air cylinder (42).

7. The cell washing apparatus according to claim 6, wherein the transfer assembly (10) comprises a plurality of clamps for clamping the cells, each clamp comprising a second stationary jaw (11), a second cylinder (12) fixed relative to the second stationary jaw (11), and a second movable jaw (13) fixed to an extended end of the second cylinder (12).

8. The battery cell cleaning device according to claim 1, wherein an adjusting assembly (60) for adjusting a distance between the cleaning assembly (20) and the conveying assembly (10) is further disposed in the box body (100), the adjusting assembly (60) includes an adjusting rod (61) disposed in the box body (100) along the second preset direction (2) and a sliding plate (62) in threaded engagement with the adjusting rod (61), a position of the adjusting rod (61) is fixed relative to the box body (100), and the cleaning assembly (20) is disposed on the sliding plate (62).

9. The cell washing apparatus according to claim 1, further comprising a controller coupled to the washing assembly (20), the controller being configured to output the rotation speed, the washing current, the voltage, and the air pressure of the washing assembly (20) in real time.

10. A battery cell cleaning device, characterized by comprising the battery cell cleaning device according to any one of claims 1 to 9.

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