A metal lithium shearing device

Abstract

The present invention belongs to the technical field of shearing devices, and specifically is a metal lithium shearing device, comprising a base frame, a conveying structure provided at the upper end of the base frame, the conveying structure comprising two conveyor belts, the two conveyor belts being provided on the inner wall of the base frame, an operating panel being provided between the two conveyor belts, a shearing structure being provided inside the operating panel, the shearing structure comprising a lifting block, the lifting block being slidably connected to the inside of the operating panel, a shearing knife being provided at one end of the lifting block, and an adjustment structure being provided on the side wall of the operating panel; the adjustment structure comprising: a connecting frame. By providing the adjustment structure, when the shearing knife moves toward the lithium strip to perform shearing, a pressing roller connected to the shearing knife will also be driven by the shearing knife, thereby automatically smoothing the lithium strip before shearing, and at the same time straightening the lithium strip, so that the smoothing, straightening and shearing work are performed in one piece, thereby completing the shearing work faster.

Description

Technical Field

[0001] The invention belongs to the technical field of shearing devices, in particular to a metal lithium shearing device. Background Art

[0002] Lithium metal is relatively soft, and its corresponding element is a silvery-white soft metal. It is also the metal with the lowest density and can be cut with a knife. Lithium ribbons extruded from lithium ingots are mainly used to make light alloys and batteries, and need to be sheared by a shearing device during lithium ribbon processing.

[0003] Traditionally, when cutting lithium ribbons, the ribbons are first fixed, then cutting lines are drawn, and finally shears are used for cutting. However, this cutting method cannot cope with a large amount of cutting work. For this reason, the existing technology sets the cutting work of lithium ribbons as an assembly line, and transports the lithium ribbons through a conveyor belt. When the lithium ribbons are transported to the part to be cut, the shears are started to cut them. The lithium ribbons need to be flattened before cutting, and they need to be straightened during cutting before cutting can be performed. However, the above steps are difficult to perform simultaneously, which not only affects the working cycle of lithium ribbon cutting, but also each step needs to be performed separately, which increases the operating cost.

[0004] To this end, the present invention provides a metal lithium shearing device. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the metal lithium shearing device described in the present invention includes a base frame, a conveying structure is provided at the upper end of the base frame, the conveying structure includes two conveyor belts, the two conveyor belts are arranged on the inner wall of the base frame, an operating panel is provided between the two conveyor belts, a shearing structure is provided inside the operating panel, the shearing structure includes a lifting block, the lifting block is slidably connected to the inside of the operating panel, a shearing knife is provided at one end of the lifting block, and an adjustment structure is provided on the side wall of the operating panel; the adjustment structure includes: a connecting frame, the two connecting frames are respectively rotatably connected to the two ends of the lifting block; a coil spring, the coil spring is provided at both ends of the connecting frame, and one end of the coil spring is connected to the lifting block; a pressing roller, the pressing roller is provided at the end of the connecting frame.

[0007] Preferably, the conveying structure also includes a conveying frame, which is arranged at the upper end of the base frame, and the conveyor belt is arranged inside the conveying frame. The side wall of the conveying frame is provided with a motor, and the motor is communicated with the conveyor belt. The adjustment structure also includes: a second connecting rod, which is arranged at one end of the lifting block; a first gear, which is rotatably connected to the side wall of the operating panel; a first connecting rod, which is arranged on the surface of the first gear; an adjusting arm, which is rotatably connected to the side wall of the operating panel, and a first adjusting groove and a second adjusting groove are opened on the surface of the adjusting arm, and the first connecting rod slides on the inner wall of the first adjusting groove, and the second connecting rod slides on the inner wall of the second adjusting groove.

[0008] Preferably, a third gear is provided at one end of the pressing roller, a rack is provided at the upper end of the conveying frame, and the third gear is meshed with the rack during operation.

[0009] Preferably, the side wall of the operating panel is rotatably connected to a second gear, and the second gear is engaged with the first gear, and the side wall of the operating panel is symmetrically provided with the shearing structure and the adjusting structure.

[0010] Preferably, an air jet frame is provided inside the operating panel at one end close to the shearing knife, a rubber sheet is slidably connected to the inside of the air jet frame, and a nozzle is provided at one end of the air jet frame.

[0011] Preferably, the rubber sheet is connected to the shearing knife.

[0012] Preferably, a reset rubber block is provided at one end of the inner wall of the jet frame close to the shearing knife, and the connection between the shearing knife and the rubber sheet is in contact with the reset rubber block.

[0013] Preferably, the upper end of the conveying frame is slidably connected to two adjustment blocks, and the two adjustment blocks move towards each other during operation.

[0014] Preferably, an adjustment frame is provided at the upper end of the conveying frame, and a reciprocating screw is rotatably connected to the surface of the adjustment frame. Two sliders are threadedly connected to the surface of the reciprocating screw, and the sliders slide on the surface of the adjustment frame. The two sliders are respectively connected to the two adjustment blocks.

[0015] Preferably, one end of the reciprocating screw is sleeved with a connecting belt, and one end of the connecting belt is connected to the motor.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The metal lithium shearing device described in the present invention, by setting an adjustment structure, when shearing a lithium strip, first place the lithium strip on the surface of the two conveyor belts, and then start the first gear to rotate. The first gear will drive the lifting block to move toward the direction of the lithium strip through the adjustment arm, and during the movement of the lifting block, the pressing roller connected to the lifting block will also move toward the direction of the lithium strip, and the pressing roller will first contact the lithium strip. Since there are two pressing rollers, the two pressing rollers will move in a direction away from each other, thereby assisting in smoothing the lithium strip. After smoothing, since the lifting block continues to move at this time, the cutting knife connected to the lifting block will contact the lithium strip, and at the same time, the third gear located at one end of the pressing roller will engage with the rack, thereby rotating, and during the rotation, it will assist in pulling the lithium strip straight, thereby reducing the error caused by wrinkles or twists in the lithium strip, making the shearing line more accurate. This structure can make the smoothing, straightening and shearing work integrated when shearing the lithium strip, thereby completing the shearing work faster.

[0018] 2. The metal lithium shearing device described in the present invention is configured with an adjustment frame. When the conveyor belt transfers the lithium belt, the motor will drive the reciprocating screw to rotate through the connecting belt, so that the slider connected to the reciprocating screw moves on the surface of the reciprocating screw, and the adjustment block at the lower end of the slider will contact the side wall of the lithium belt during the movement, thereby adjusting the position of the lithium belt, so that the moving direction of the lithium belt is always parallel to the side wall of the conveyor belt, so as to facilitate subsequent shearing and transfer work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 is a perspective view of embodiment 1 of the present invention;

[0021] Figure 2 This is a front view of the first embodiment of the present invention;

[0022] Figure 3 This is a connection diagram of the first gear and the adjustment arm of the present invention;

[0023] Figure 4 This is a position diagram of the connection frame and the pressing roller of the present invention;

[0024] Figure 5 It is a position diagram of the cutting blade and the air jet frame of the present invention;

[0025] Figure 6 yes Figure 5 A partial enlarged view of the middle part;

[0026] Figure 7 It is a position diagram of the motor and the adjustment frame of the present invention;

[0027] Figure 8 It is a connection diagram of the reciprocating screw and the slider of the present invention;

[0028] In the figure: 1. Base frame; 2. Operation panel; 3. Shearing structure; 31. Lifting block; 32. Shearing knife; 4. Adjusting structure; 401. Adjusting arm; 402. First gear; 403. Rack; 404. Second gear; 405. First adjusting slot; 406. Pressing roller; 407. Second adjusting slot; 408. First connecting rod; 409. Second connecting rod; 410. Third gear; 411. Adjusting block; 412. Connecting frame; 413. Coil spring; 414. Jet frame; 415. Nozzle; 416. Adjusting frame; 417. Rubber sheet; 418. Resetting rubber block; 419. Reciprocating screw; 420. Slider; 421. Connecting belt; 5. Conveying structure; 51. Conveying frame; 52. Conveyor belt; 53. Motor. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0030] Example 1: Figures 1 to 8 As shown, a metal lithium shearing device of an embodiment of the present invention includes a base frame 1, a conveying structure 5 is provided at the upper end of the base frame 1, the conveying structure 5 includes two conveyor belts 52, the two conveyor belts 52 are arranged on the inner wall of the base frame 1, an operating panel 2 is provided between the two conveyor belts 52, a shearing structure 3 is provided inside the operating panel 2, the shearing structure 3 includes a lifting block 31, the lifting block 31 is slidably connected to the inside of the operating panel 2, a shearing knife 32 is provided at one end of the lifting block 31, and an adjustment structure 4 is provided on the side wall of the operating panel 2; the adjustment structure 4 includes: a connecting frame 412, the two connecting frames 412 are respectively rotatably connected to the two ends of the lifting block 31; a coil spring 413, the coil spring 413 is provided at both ends of the connecting frame 412, and one end of the coil spring 413 is connected to the lifting block 31; a pressing roller 406, the pressing roller 406 is provided at the end of the connecting frame 412.

[0031] The specific scheme is a metal lithium shearing device, which is mainly used for shearing lithium strips. When in use, the lithium strip is first placed on the surface of the two conveyor belts 52, and then the conveyor belt 52 is started to convey the lithium strip. When the lithium strip moves to the position to be sheared, the conveyor belt 52 is closed and the lifting block 31 is started to move toward the direction close to the lithium strip. During the movement of the lifting block 31, the connecting frame 412 connected to the lifting block 31 will also move with the pressing roller 406 toward the direction close to the lithium strip, and after moving a certain distance, the pressing roller 406 will first contact the surface of the lithium strip. Since there are two pressing rollers 406, the two pressing rollers 406 are in opposite directions, and the connecting frame 412 is tilted, when the pressing roller 406 contacts the lithium strip, the two pressing rollers 406 will move in the direction away from each other, and in this process, the coil spring 413 will release the elastic force, so that the pressing roller 406 fits the lithium strip, thereby helping to smooth the lithium strip. After smoothing, due to the lifting block 31 is still moving, so the pressing roller 406 will also move to the surface of the conveyor belt 52 at this time, and the shearing knife 32 at one end of the lifting block 31 will also contact the lithium ribbon. At this time, the pressing roller 406 is started to rotate. Since the pressing roller 406 is in contact with the lithium ribbon and the conveyor belt 52 has stopped rotating at this time, the two pressing rollers 406 will assist in straightening the lithium ribbon during the rotation, thereby reducing the error caused by wrinkles or twists in the lithium ribbon and making the shearing line more accurate. Since the lithium ribbon is soft in texture, the shearing knife 32 can complete the shearing of the lithium ribbon when it contacts the straightened lithium ribbon. By setting the adjustment structure 4, when the shearing knife 32 moves toward the direction of the lithium ribbon to perform the shearing work, the pressing roller 406 connected to the shearing knife 32 will also be driven by the shearing knife 32, thereby automatically flattening the lithium ribbon before shearing, and at the same time, the lithium ribbon can be straightened, so that the smoothing, straightening and shearing work are performed in one piece, thereby completing the shearing work faster.

[0032] like Figures 1 to 5 As shown, the conveying structure 5 also includes a conveying frame 51, which is arranged at the upper end of the base frame 1, and the conveying belt 52 is arranged inside the conveying frame 51, and the side wall of the conveying frame 51 is provided with a motor 53, which is connected to the conveying belt 52. The adjustment structure 4 also includes: a second connecting rod 409, which is arranged at one end of the lifting block 31; a first gear 402, which is rotatably connected to the side wall of the operating panel 2; a first connecting rod 408, which is arranged on the surface of the first gear 402; an adjusting arm 401, which is rotatably connected to the side wall of the operating panel 2, and a first adjusting groove 405 and a second adjusting groove 407 are opened on the surface of the adjusting arm 401, and the first connecting rod 408 slides on the inner wall of the first adjusting groove 405, and the second connecting rod 409 slides on the inner wall of the second adjusting groove 407.

[0033] Specifically, when the lithium belt is placed on the surface of the conveyor belt 52, the motor 53 is started to rotate the conveyor belt 52. When the lithium belt moves to the position to be sheared, the first gear 402 is started to rotate. During the rotation, the first gear 402 will drive the adjusting arm 401 to rotate, and during the rotation of the adjusting arm 401, the second connecting rod 409 located on the inner wall of the second adjusting groove 407 will also be driven, and the second connecting rod 409 can slide on the inner wall of the second adjusting groove 407. Since the lifting block 31 at one end of the second connecting rod 409 can only move vertically inside the operating panel 2, the lifting block 31 connected to the second connecting rod 409 will be driven to move toward the direction close to the lithium belt, thereby performing the shearing work of the lithium belt.

[0034] like Figures 1 to 5 As shown, a third gear 410 is provided at one end of the pressing roller 406 , a rack 403 is provided at the upper end of the conveying frame 51 , and the third gear 410 is meshed with the rack 403 during operation.

[0035] Specifically, after the pressing roller 406 smoothes the lithium tape, it will move to the surface of the conveyor belt 52 and slide on the surface of the conveyor belt 52. During the sliding process, the third gear 410 located at one end of the pressing roller 406 will engage with the rack 403, causing the pressing roller 406 to rotate automatically, thereby assisting in straightening the lithium tape for shearing.

[0036] like Figures 1 to 3 As shown, the side wall of the operating panel 2 is rotatably connected to the second gear 404 , and the second gear 404 is meshed with the first gear 402 . The side wall of the operating panel 2 is symmetrically provided with a shearing structure 3 and an adjusting structure 4 .

[0037] Specifically, by symmetrically arranging the shearing blade 32 and the adjusting arm 401 on the side wall of the operating panel 2, the second gear 404 will be driven to rotate during the rotation of the first gear 402, so that the two shearing blades 32 can shear the lithium strip at the same time, so that the shearing force is dispersed to the two contact points, reducing the local stress concentration of the lithium strip and making the incision smoother.

[0038] like Figures 5 and 6 As shown, an air jet frame 414 is provided at one end of the operating panel 2 near the shearing knife 32 , a rubber sheet 417 is slidably connected to the inside of the air jet frame 414 , and a nozzle 415 is provided at one end of the air jet frame 414 .

[0039] Specifically, a jet frame 414 is set inside the operating panel 2. When the shear knife 32 moves to cut the lithium ribbon, the rubber sheet 417 is started. The rubber sheet 417 will move downward inside the jet frame 414. Since the rubber sheet 417 is in contact with the inner wall of the jet frame 414, the rubber sheet 417 will squeeze the gas from the nozzle 415 during the movement. Since the end of the nozzle 415 points to the part to be sheared of the lithium ribbon, the debris and dust on the surface of the lithium ribbon can be blown away at this time, thereby preventing these debris from affecting the shearing effect.

[0040] like Figures 5 and 6 As shown, the rubber sheet 417 is connected to the shearing knife 32.

[0041] Specifically, by connecting the rubber sheet 417 to the shearing knife 32, the rubber sheet 417 will be automatically driven to move during the shearing process of the shearing knife 32, thereby realizing automatic blowing.

[0042] like Figure 6 As shown, a reset rubber block 418 is provided at one end of the inner wall of the jet frame 414 close to the shearing knife 32 , and the connection between the shearing knife 32 and the rubber sheet 417 is in contact with the reset rubber block 418 .

[0043] Specifically, by setting a reset rubber block 418, a small crack will appear when the rubber sheet 417 contacts the reset rubber block 418, so that the rubber sheet 417 can move. When the reset rubber block 418 does not contact the rubber sheet 417, the reset rubber block 418 on the side wall of the jet frame 414 will abut against it, thereby isolating the inside of the jet frame 414 from the outside and preventing the internal gas from leaking sideways.

[0044] Example 2: Figures 1 to 8 As shown, compared with Example 1, another embodiment of the present invention is that: the upper end of the conveying frame 51 is slidably connected to two adjustment blocks 411, and the two adjustment blocks 411 move towards each other during operation.

[0045] Specifically, by setting an adjustment block 411 at the upper end of the conveying frame 51, when the conveyor belt 52 transfers the lithium belt, the adjustment block 411 is started, and the two adjustment blocks 411 will move toward the direction of the lithium belt and contact the side wall of the lithium belt, thereby adjusting the direction of the lithium belt so that the moving direction of the lithium belt is always parallel to the side wall of the conveyor belt 52, which is convenient for subsequent shearing and transfer work.

[0046] like Figures 7 and 8As shown, an adjusting frame 416 is provided at the upper end of the conveying frame 51, and a reciprocating screw 419 is rotatably connected to the surface of the adjusting frame 416. Two sliders 420 are threadedly connected to the surface of the reciprocating screw 419, and the sliders 420 slide on the surface of the adjusting frame 416. The two sliders 420 are respectively connected to the two adjusting blocks 411.

[0047] Specifically, when it is necessary to adjust the position of the lithium belt on the surface of the conveyor belt 52, first adjust the position of the reciprocating screw 419 on the upper end of the adjustment frame 416 according to the width of the lithium belt, and then start the reciprocating screw 419 to rotate. Since the slider 420 is threadedly connected to the reciprocating screw 419 and the slider 420 slides on the surface of the adjustment frame 416, the slider 420 will slide on the surface of the reciprocating screw 419 at this time, and drive the adjustment block 411 at the lower end to move together, thereby adjusting the position of the lithium belt on the surface of the conveyor belt 52, and after the adjustment, the reciprocating screw 419 will continue to rotate, so that the slider 420 automatically resets, and the subsequent lithium belt position adjustment work can be carried out continuously.

[0048] like Figure 7 As shown, one end of the reciprocating screw 419 is covered with a connecting belt 421 , and one end of the connecting belt 421 is connected to the motor 53 .

[0049] Specifically, by connecting the reciprocating screw 419 and the motor 53 with a connecting belt 421, when the motor 53 drives the lithium belt on the surface of the conveyor belt 52 to move, the motor 53 will also drive the reciprocating screw 419 to rotate through the connecting belt 421, so that the adjustment block 411 automatically adjusts the position of the lithium belt.

[0050] Working principle: When in use, first place the lithium ribbon on the surface of the two conveyor belts 52, then start the motor 53 to control the conveyor belt 52 to rotate, so as to convey the lithium ribbon. When the lithium ribbon moves to the position to be cut, close the conveyor belt 52 and start the first gear 402 to rotate. The first gear 402 will drive the adjustment arm 401 to rotate during the rotation process, and during the rotation process of the adjustment arm 401, the second connecting rod 409 located on the inner wall of the second adjustment groove 407 will also be driven, and the second connecting rod 409 can be in the second adjustment groove 407. The inner wall slides, and since the lifting block 31 at one end of the second connecting rod 409 can only move vertically inside the operating panel 2, the lifting block 31 connected to the second connecting rod 409 will be driven to move toward the direction close to the lithium belt. During the movement of the lifting block 31, the connecting frame 412 connected to the lifting block 31 will also move the pressing roller 406 toward the direction close to the lithium belt, and after moving a certain distance, the pressing roller 406 will first contact the surface of the lithium belt. Since there are two pressing rollers 406, the directions of the two pressing rollers 406 are different. On the contrary, and the connecting frame 412 is tilted, so when the pressing roller 406 contacts the lithium belt, the two pressing rollers 406 will move in the direction away from each other, and in this process the coil spring 413 will release the elastic force, so that the pressing roller 406 fits the lithium belt, thereby assisting in smoothing the lithium belt. After smoothing, since the lifting block 31 is still moving at this time, the pressing roller 406 will also move to the surface of the conveyor belt 52 to slide, and the shear knife 32 at one end of the lifting block 31 will also contact the lithium belt. At this time, the pressing roller 406 06 During the sliding process, the third gear 410 located at one end of the pressing roller 406 will engage with the rack 403, causing the pressing roller 406 to rotate automatically. Since the pressing roller 406 is in contact with the lithium belt and the conveyor belt 52 has stopped rotating at this time, the two pressing rollers 406 will assist in straightening the lithium belt during the rotation, thereby reducing the error caused by wrinkles or twists in the lithium belt and making the cutting line more accurate. Since the lithium belt is soft in texture, the shear knife 32 can complete the cutting of the lithium belt when it comes into contact with the straightened lithium belt.

[0051] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium metal shearing device, characterized in that: The invention comprises a base frame (1), wherein a conveying structure (5) is provided at the upper end of the base frame (1), wherein the conveying structure (5) comprises two conveying belts (52), wherein the two conveying belts (52) are provided on the inner wall of the base frame (1), and an operating panel (2) is provided between the two conveying belts (52). A shearing structure (3) is provided inside the operating panel (2), and wherein the shearing structure (3) comprises a lifting block (31), wherein the lifting block (31) is slidably connected to the inside of the operating panel (2), and a shearing knife (32) is provided at one end of the lifting block (31), and an adjusting structure (4) is provided on the side wall of the operating panel (2); The regulating structure (4) comprises: Connecting frames (412), two connecting frames (412) are rotatably connected to two ends of the lifting block (31); A coil spring (413), the coil spring (413) being provided at both ends of the connecting frame (412), and one end of the coil spring (413) being connected to the lifting block (31); a pressing roller (406), the pressing roller (406) being arranged at an end of the connecting frame (412); The conveying structure (5) further comprises a conveying frame (51), the conveying frame (51) being arranged at the upper end of the base frame (1), and the conveying belt (52) being arranged inside the conveying frame (51), a motor (53) being arranged on the side wall of the conveying frame (51), the motor (53) being connected to the conveying belt (52), and the regulating structure (4) further comprising: A second connecting rod (409), the second connecting rod (409) being provided at one end of the lifting block (31); a first gear (402), the first gear (402) being rotatably connected to a side wall of the operating panel (2); a first connecting rod (408), the first connecting rod (408) being disposed on a surface of the first gear (402); An adjusting arm (401), the adjusting arm (401) being rotatably connected to a side wall of the operating panel (2), and a first adjusting groove (405) and a second adjusting groove (407) being provided on a surface of the adjusting arm (401), and the first connecting rod (408) sliding on an inner wall of the first adjusting groove (405), and the second connecting rod (409) sliding on an inner wall of the second adjusting groove (407); A third gear (410) is provided at one end of the pressing roller (406), a rack (403) is provided at the upper end of the conveying frame (51), and the third gear (410) is meshed with the rack (403) during operation.

2. A metal lithium shearing device according to claim 1, characterized in that: The side wall of the operating panel (2) is rotatably connected to a second gear (404), and the second gear (404) is meshed with the first gear (402). The side wall of the operating panel (2) is symmetrically provided with the shearing structure (3) and the adjusting structure (4).

3. A metal lithium shearing device according to claim 1, characterized in that: An air jet frame (414) is provided at one end of the operating panel (2) near the shearing knife (32), a rubber sheet (417) is slidably connected to the inside of the air jet frame (414), and a nozzle (415) is provided at one end of the air jet frame (414).

4. A lithium metal shearing device according to claim 3, characterized in that: The rubber sheet (417) is connected to the shearing knife (32).

5. The lithium metal shearing device according to claim 4, characterized in that: A reset rubber block (418) is provided at one end of the inner wall of the jet frame (414) close to the shearing knife (32), and the connection between the shearing knife (32) and the rubber sheet (417) is in contact with the reset rubber block (418).

6. The lithium metal shearing device according to claim 1, characterized in that: The upper end of the conveying frame (51) is slidably connected to two adjustment blocks (411), and the two adjustment blocks (411) move towards each other during operation.

7. A metal lithium shearing device according to claim 6, characterized in that: An adjusting frame (416) is provided at the upper end of the conveying frame (51), and a reciprocating screw (419) is rotatably connected to the surface of the adjusting frame (416). Two sliders (420) are threadedly connected to the surface of the reciprocating screw (419), and the sliders (420) slide on the surface of the adjusting frame (416). The two sliders (420) are respectively connected to the two adjusting blocks (411).

8. The lithium metal shearing device according to claim 7, characterized in that: One end of the reciprocating screw (419) is sleeved with a connecting belt (421), and one end of the connecting belt (421) is connected to the motor (53).

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