CN110773636B - Compression molding machine and compression molding method for manufacturing integrated ceiling aluminum pinch plate - Google Patents

Abstract

The invention relates to a compression molding machine for manufacturing an integrated ceiling gusset plate, which comprises an installation frame, a stamping external member, a die core external member and a flanging external member, wherein the stamping external member, the die core external member and the flanging external member are sequentially arranged in the installation frame from top to bottom, and the compression molding machine can solve the following problems in the actual production process of the existing gusset plate: in the production process of the existing aluminous gusset plate, the flanging inclination of the product is different due to the sequential flanging operation during flanging, so that the appearance of the product has flaws, even bad products are generated, and the waste of raw materials and the cost are greatly caused; b: the existing compression molding machine can only produce a product with one size in the production process, and the time is usually spent for carrying out die change treatment when the size is modified, so that the production efficiency of the product is seriously influenced, and the labor hour is wasted.

Description

Compression molding machine and compression molding method for manufacturing integrated ceiling aluminum pinch plate

Technical Field

The invention relates to the technical field of aluminum product processing, in particular to a compression molding machine and a compression molding method for manufacturing an integrated ceiling aluminum gusset plate.

Background

Along with the rapid growth of the economy of China, the living standard of the nation is gradually improved, and the decoration of houses by the nation is more and more elaborate, wherein the ceiling decoration is popular among the people, and the demand of the aluminous gusset plate serving as a core part in the ceiling decoration is increasingly expanded.

The existing aluminous gusset plate has the following problems in the actual production process: in the production process of the existing aluminous gusset plate, the flanging inclination of the product is different due to the sequential flanging operation during flanging, so that the appearance of the product has flaws, even bad products are generated, and the waste of raw materials and the cost are greatly caused; b: the existing compression molding machine can only produce a product with one size in the production process, and the time is usually spent for carrying out die change treatment when the size is modified, so that the production efficiency of the product is seriously influenced, and the labor hour is wasted.

In order to make up for the defects of the prior art, the invention provides a compression molding machine and a compression molding method for manufacturing an integrated ceiling aluminum gusset plate.

Disclosure of Invention

The technical scheme adopted by the invention to solve the technical problem is as follows: the utility model provides an integrated furred ceiling aluminous gusset plate makes compression molding machine, includes mounting bracket, punching press external member, mold core external member and turn-ups external member, and inside from last punching press external member, mold core external member and the turn-ups external member of down having set gradually of mounting bracket, wherein:

the punching press external member includes pneumatic cylinder A, briquetting fixed plate, locking screw, spacing splint and shaping briquetting, and pneumatic cylinder A installs on the mounting bracket outer wall, is provided with the briquetting fixed plate on the pneumatic cylinder A output shaft, and the briquetting fixed plate evenly is provided with locking screw along its circumference direction through threaded connection's mode all around, and locking screw passes the briquetting fixed plate, and both ends are provided with spacing splint through sliding connection's mode symmetry about the briquetting fixed plate, and the spacing splint outside is supported and is leaned on locking screw, and briquetting fixed plate lower extreme is provided with the shaping briquetting.

The mold core external member includes the connecting plate, the guide post, the direction slide, the mold core frame, the location buckle, rotating turret and backup pad, the connecting plate is installed on the mounting bracket inner wall through the welded mode, the connecting plate central zone is provided with through-hole A, the connecting plate evenly is provided with through-hole B on along its circumference direction, evenly be provided with the direction slide along its circumference on the terminal surface under the connecting plate, be provided with the guide post that passes through-hole A under the connecting plate on the terminal surface, the mold core frame is installed through the welded mode to the guide post upper end, evenly be provided with the location buckle through sliding connection's mode on the mold core frame up end, the mold core frame evenly is provided with the rotating turret on its circumference direction, the mode that spring coupling.

The flanging suite comprises a hydraulic cylinder B, a push plate, a push rod, a leveling sleeve, a connecting rod, a hydraulic cylinder C, a sliding plate, a leveling plate, a jacking column, a pushing column and a flanging mechanism, wherein the hydraulic cylinder B is installed on the outer wall of the installation frame, an output shaft of the hydraulic cylinder B penetrates through the installation frame, the push plate is arranged on the output shaft of the hydraulic cylinder B, the push rod is uniformly arranged on the push plate, the upper end of the push rod is provided with the leveling sleeve, the leveling sleeve is installed on the guide column in a sliding connection mode, the connecting rod is uniformly arranged on the outer wall of the leveling sleeve along the circumferential direction of the leveling sleeve, the hydraulic cylinder C is fixedly connected onto the connecting rod, the hydraulic cylinder C is installed on the sliding plate, the sliding plate is installed on the guide slideway in a sliding connection mode, the output shaft of the hydraulic cylinder C penetrates through the through hole, the upper end of the pushing column is provided with a flanging mechanism.

As a preferred technical scheme of the invention, the flanging mechanism comprises an extrusion frame, a jacking slide block, a trapezoidal slide block, a round ball ejector rod, a round groove block, a rotating rod, a downward pressing slide block, a transverse push rod, an air storage bag A, a jacking rod and a flanging frame, wherein the extrusion frame is arranged on the rotating frame in a pin shaft connection mode, the extrusion frame is of a shell structure, the jacking slide block is arranged on the lower end surface of the extrusion frame in a sliding connection mode, the trapezoidal slide block is symmetrically arranged at the left end and the right end of the jacking slide block, the round ball ejector rod is arranged at the left end of the trapezoidal slide block, the round groove block is arranged at the left end of the round ball ejector rod, the round groove block is fixedly arranged on the rotating rod, the downward pressing slide block is abutted at the lower end of the rotating rod, the transverse push rod is abutted at the right end of the downward pressing slide block, one end of the transverse push rod, the upper end surface of the jacking rod is provided with a flanging frame.

As a preferable technical scheme of the invention, hard rubber is arranged on the outer surface of the flanging frame.

As a preferred technical scheme of the invention, the upper end face of the mold core frame is provided with a rectangular blind groove, and the inclination from the upper end face to the bottom face of the blind groove is 135 degrees.

As a preferred technical scheme of the invention, the mold core frame comprises a rotating handle, an advancing rod, a pressed rod, an air storage bag B, a jacking push rod and a sliding bottom surface, the mold core frame is of a shell structure, the rotating handle penetrates through the mold core frame in a threaded connection mode, the advancing rod is arranged at the left end of the rotating handle, the left end of the advancing rod abuts against the pressed rod, one end of the pressed rod is located inside the air storage bag B, the air storage bag B is installed on the inner wall of the mold core frame, the jacking push rod is arranged at the upper end of the left side of the air storage bag B, and the upper end of the jacking push rod abuts against the.

As a preferable technical scheme of the invention, the holding part of the rotating handle is provided with uniform spiral patterns.

The invention also provides a compression molding method of the compression molding machine for manufacturing the integrated ceiling aluminous gusset plate, which comprises the following steps:

s1, placing an aluminum plate to be processed on a die core frame, and manually pulling a positioning buckle to fix the aluminum plate on the die core frame;

s2, manually rotating the rotating handle, adjusting the depth of the die core frame to a designed size, and manually installing a required forming press block;

s3, after the hydraulic cylinder A starts to work to drive the forming press block to be pressed down to the maximum depth, the four edges of the aluminum plate to be processed are required to be tilted to a certain angle, the hydraulic cylinder B starts to work to drive the flanging suite to work, and the four tilted edges are flattened, so that the purpose of flanging is achieved;

s4, the hydraulic cylinder A and the hydraulic cylinder B work, the flanging suite stops working, the forming press block rises, and a finished product is manually taken out of the die core frame to achieve the purpose of taking out the finished product;

and S5, repeating the motions of S3 and S4 to complete the punching and flanging treatment of the aluminum product to be processed.

Compared with the prior art, the invention has the following advantages:

1. the invention can solve the following problems in the actual production process of the traditional aluminum gusset plate: in the production process of the existing aluminum gusset plate, the flanging inclination of the product is different due to the sequential flanging operation during flanging, so that the appearance of the product has flaw, even a bad product is generated, and the waste of raw materials and the cost are greatly caused; b: the existing compression molding machine can only produce a product with one size in the production process, and the time is usually spent for carrying out die change treatment when the size is modified, so that the production efficiency of the product is seriously influenced, and the labor hour is wasted.

2. According to the flanging mechanism, the pushing plate, the pushing rod and the aligning sleeve are driven to move upwards simultaneously through the hydraulic cylinder B, the connecting rod is driven to move upwards, the hydraulic cylinder C and the sliding plate are driven to slide upwards along the guide slide way simultaneously, the hydraulic cylinder C starts to work while sliding to drive the aligning plate to move upwards, the jacking column and the pushing column are pushed to move upwards, and the flanging mechanism is driven to work, so that the purpose of flanging the periphery simultaneously is achieved.

3. According to the invention, the mold core frame is designed, the rotating handle is manually rotated to drive the advancing rod to move to the left side, the pressed rod is pushed to move to the left side, air in the air storage bag B is pushed, the jacking push rod and the sliding bottom surface are driven to move upwards, and therefore the purpose of controlling the depth of the aluminous gusset plate is achieved, the mold changing time for modifying the size is reduced, and the production efficiency is improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

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

FIG. 2 is a schematic structural view of the punch set of the present invention;

FIG. 3 is a schematic structural view of the turn-up kit of the present invention;

FIG. 4 is a schematic structural view of the turn-up mechanism of the present invention;

FIG. 5 is a schematic view of the construction of the die core frame of the present invention;

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further explained with reference to fig. 1 to 5.

The utility model provides an integrated furred ceiling aluminous gusset plate makes compression molding machine, includes mounting bracket 1, punching press external member 2, mold core external member 3 and turn-ups external member 4, 1 inside punching press external member 2, mold core external member 3 and the turn-ups external member 4 of down having set gradually from last of mounting bracket, wherein:

punching press external member 2 includes pneumatic cylinder A, briquetting fixed plate 21, locking screw 22, stop plate 23 and shaping briquetting 24, pneumatic cylinder A installs on 1 outer wall of mounting bracket, be provided with briquetting fixed plate 21 on the pneumatic cylinder A output shaft, briquetting fixed plate 21 evenly is provided with locking screw 22 along its circumference direction mode through threaded connection all around, locking screw 22 passes briquetting fixed plate 21, both ends are provided with stop plate 23 through sliding connection's mode symmetry about briquetting fixed plate 21, stop plate 23 supports in the outside supports on locking screw 22, briquetting fixed plate 21 lower extreme is provided with shaping briquetting 24, concrete during operation, pneumatic cylinder A begins work, drive briquetting fixed plate 21 and the downward motion of shaping briquetting 24, thereby reach the purpose of punching press.

Mold core external member 3 includes connecting plate 31, the guide post 32, the direction slide 33, mold core frame 34, location buckle 35, rotating turret 36 and backup pad 37, connecting plate 31 is installed on mounting bracket 1 inner wall through the welded mode, connecting plate 31 central zone is provided with through-hole A, connecting plate 31 evenly is provided with through-hole B along its circumference direction, evenly be provided with direction slide 33 along its circumference on the connecting plate 31 lower extreme, be provided with the guide post 32 that passes through-hole A on the connecting plate 31 lower extreme, mold core frame 34 is installed through the welded mode to guide post 32 upper end, evenly be provided with location buckle 35 through sliding connection's mode on the mold core frame 34 up end, mold core frame 34 evenly is provided with rotating turret 36 along its circumference direction, mold core frame 34 upper end is provided with backup pad 37 through spring coupling's mode.

The upper end face of the die core frame 34 is provided with a rectangular blind groove, and the inclination from the upper end face to the bottom face of the blind groove is 135 degrees.

The die core frame 34 comprises a rotary handle 341, an advancing rod 342, a pressed rod 343, an air storage bag B344, a jacking push rod 345 and a sliding bottom surface 346, the die core frame 34 is of a shell structure, the rotary handle 341 penetrates through the die core frame 34 in a threaded connection mode, the advancing rod 342 is arranged at the left end of the rotary handle 341, the left end of the advancing rod 342 abuts against the pressed rod 343, one end of the pressed rod 343 is located inside the air storage bag B344, the air storage bag B344 is installed on the inner wall of the die core frame 34, the jacking push rod 345 is arranged at the upper end of the left side of the air storage bag B344, and the sliding bottom surface 346 abuts against the upper end of the jacking push rod 345.

The handle 341 is provided with uniform spiral patterns at the hand holding position.

The flanging suite 4 comprises a hydraulic cylinder B, a push plate 41, a push rod 42, a sliding sleeve 43, a connecting rod 44, a hydraulic cylinder C, a sliding plate 45, a leveling plate 46, a jacking column 47, a pushing column 48 and a flanging mechanism 49, wherein the hydraulic cylinder B is installed on the outer wall of the installation frame 1, an output shaft of the hydraulic cylinder B penetrates through the installation frame 1, the push plate 41 is arranged on the output shaft of the hydraulic cylinder B, the push rod 42 is uniformly arranged on the push plate 41, the leveling sleeve 43 is arranged at the upper end of the push rod 42, the leveling sleeve 43 is installed on the guide column 32 in a sliding connection mode, the connecting rod 44 is uniformly arranged on the outer wall of the leveling sleeve 43 along the circumferential direction of the outer wall, the hydraulic cylinder C is fixedly connected onto the connecting rod 44, the hydraulic cylinder C is installed on the sliding plate 45, the sliding plate 45 is installed on the guide slideway 33 in a, both ends symmetry is provided with jacking post 47 about on the parallel and level board 46, be provided with on the parallel and level board 46 and promote post 48, it is provided with flanging mechanism 49 to promote 48 upper ends of post, concrete during operation, pneumatic cylinder B begins work and drives slurcam 41, catch bar 42 and the upward movement of simultaneous cover 43, drive connecting rod 44 upward movement simultaneously, drive pneumatic cylinder C and sliding plate 45 and upwards slide along direction slide 33 simultaneously, the gliding while pneumatic cylinder C begins work and drives parallel and level board 46 upward movement, promote jacking post 47 and the upward movement of promotion post 48, drive flanging mechanism 49 work, thereby reach turn-ups's purpose.

The flanging mechanism 49 comprises an extrusion frame 491, a jacking slide block 492, a trapezoidal slide block 493, a round ball ejector rod 494, a round groove block 495, a rotating rod 496, a downward pressing slide block 497, a transverse push rod 498, an air storage bag A499, a jacking rod 4910 and a flanging frame 4911, the extrusion frame 491 is arranged on the rotating frame 36 in a pin shaft connection mode, the extrusion frame 491 is of a shell structure, the jacking slide block 492 is arranged on the lower end surface of the extrusion frame 491 in a sliding connection mode, the trapezoidal slide block 493 is symmetrically arranged at the left end and the right end of the jacking slide block 492, the round ball ejector rod 494 is arranged at the left end of the trapezoidal slide block 493, the round groove block 495 is fixedly arranged on the rotating rod 496, the lower end of the rotating rod 496 abuts against the downward pressing slide block 497, the transverse push rod 497 abuts against the right end of the downward pressing slide block 497, one end of the transverse push rod is arranged inside the air storage bag A499, the air storage bag A, the inside upper end of gas storage bag A499 is provided with jacking rod 4910, be provided with flanging frame 4911 on jacking rod 4910 upper end, concrete during operation, promote post 48 upwards the jacking and drive jacking slider 492 upward movement, promote trapezoidal slider 493 and remove to both ends, drive ball ejector pin 494 simultaneously and remove to both sides and drive dwang 496 and rotate to drive and push down slider 497 and move down in the circular slot piece 495, promote horizontal push rod 498 and move to the inboard, the inside air of extrusion gas storage bag A499 promotes jacking rod 4910 and moves upwards, drive flanging frame 4911 and press from both sides to inside, thereby reach turn-ups purpose.

Hard rubber is mounted on the outer surface of the flanging frame 4911.

In addition, the invention also provides a compression molding method of the compression molding machine for manufacturing the integrated ceiling aluminous gusset plate, which comprises the following steps:

s1, placing an aluminum plate to be processed on a mold core frame 34, manually pulling a positioning buckle 35, and fixing the aluminum plate on the mold core frame 34;

s2, manually rotating the rotating handle 341, adjusting the depth of the die core frame 34 to a designed size, and manually installing the required forming press block 24;

s3, after the hydraulic cylinder A starts to work to drive the forming press block 24 to be pressed down to the maximum depth, the four edges of the aluminum plate to be processed are tilted to a certain angle, the hydraulic cylinder B starts to work to drive the flanging suite 4 to work, and the four raised edges are flattened, so that the purpose of flanging is achieved;

s4, the hydraulic cylinder A and the hydraulic cylinder B work, the flanging suite 4 stops working, the forming press block 24 rises, and a finished product is manually taken out of the die core frame 34 to achieve the purpose of taking out the finished product;

and S5, repeating the motions of S3 and S4 to complete the punching and flanging treatment of the aluminum product to be processed.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The utility model provides an integrated furred ceiling aluminous gusset plate makes compression molding machine, includes mounting bracket (1), punching press external member (2), mold core external member (3) and turn-ups external member (4), its characterized in that: the inside punching press external member (2), mold core external member (3) and turn-ups external member (4) that down set gradually from last of mounting bracket (1), wherein:

the stamping kit (2) comprises a hydraulic cylinder A, a pressing block fixing plate (21), locking screws (22), limiting clamp plates (23) and a forming pressing block (24), wherein the hydraulic cylinder A is installed on the outer wall of the mounting frame (1), the pressing block fixing plate (21) is arranged on an output shaft of the hydraulic cylinder A, the locking screws (22) are uniformly arranged on the periphery of the pressing block fixing plate (21) in a threaded connection mode along the circumferential direction of the pressing block fixing plate, the locking screws (22) penetrate through the pressing block fixing plate (21), the limiting clamp plates (23) are symmetrically arranged at the left end and the right end of the pressing block fixing plate (21) in a sliding connection mode, the outer sides of the limiting clamp plates (23) abut against the locking screws (;

the die core external member (3) comprises a connecting plate (31), guide posts (32), guide slideways (33), a die core frame (34), positioning buckles (35), a rotating frame (36) and a supporting plate (37), wherein the connecting plate (31) is installed on the inner wall of the installation frame (1) in a welding mode, a through hole A is formed in the central area of the connecting plate (31), through holes B are uniformly formed in the connecting plate (31) along the circumferential direction of the connecting plate, the guide slideways (33) are uniformly formed in the lower end face of the connecting plate (31) along the circumferential direction of the connecting plate, the guide posts (32) penetrating through the through holes A are arranged on the lower end face of the connecting plate (31), the die core frame (34) is installed at the upper ends of the guide posts (32) in a welding mode, the positioning buckles (35) are uniformly arranged on the upper end face of the die core frame (34) in a sliding connection, the upper end of the die core frame (34) is provided with a supporting plate (37) in a spring connection mode;

the flanging suite (4) comprises a hydraulic cylinder B, a push plate (41), a push rod (42), a sliding sleeve (43), a connecting rod (44), a hydraulic cylinder C, a sliding plate (45), a leveling plate (46), a jacking column (47), a pushing column (48) and a flanging mechanism (49), wherein the hydraulic cylinder B is installed on the outer wall of the mounting frame (1), an output shaft of the hydraulic cylinder B penetrates through the mounting frame (1), the push plate (41) is arranged on the output shaft of the hydraulic cylinder B, the push rod (42) is uniformly arranged on the push plate (41), the leveling sleeve (43) is arranged at the upper end of the push rod (42), the leveling sleeve (43) is installed on the guide column (32) in a sliding connection mode, the connecting rod (44) is uniformly arranged on the outer wall of the leveling sleeve (43) along the circumferential direction of the outer wall, the hydraulic cylinder C is fixedly connected to the connecting rod, the sliding plate (45) is installed on the guide slide way (33) in a sliding connection mode, an output shaft of the hydraulic cylinder C penetrates through the through hole B, a leveling plate (46) is arranged on the output shaft of the hydraulic cylinder C, jacking columns (47) are symmetrically arranged at the left end and the right end of the leveling plate (46), a pushing column (48) is arranged on the leveling plate (46), and a flanging mechanism (49) is arranged at the upper end of the pushing column (48);

the flanging mechanism (49) comprises an extrusion frame (491), a jacking sliding block (492), a trapezoidal sliding block (493), a round ball ejector rod (494), a round slot block (495), a rotating rod (496), a downward pressing sliding block (497), a transverse push rod (498), an air storage bag A (499), a jacking rod (4910) and a flanging frame (4911), wherein the extrusion frame (491) is arranged on the rotating frame (36) in a pin shaft connection mode, the extrusion frame (491) is of a shell structure, the jacking sliding block (492) is arranged on the lower end surface of the extrusion frame (491) in a sliding connection mode, the trapezoidal sliding blocks (493) are symmetrically arranged at the left end and the right end of the jacking sliding block (492), the round ball ejector rod (494) is arranged at the left end of the trapezoidal sliding block (493), the round slot block (495) is fixedly arranged on the rotating rod (496), the lower end of the rotating rod (496) is abutted against the downward pressing sliding block (497), the right end of the lower pressing slide block (497) is abutted against a transverse push rod (498), one end of the transverse push rod (498) is arranged inside an air storage bag A (499), the air storage bag A (499) is fixedly arranged on the inner wall of the extrusion frame (491), the upper end inside the air storage bag A (499) is provided with a lifting rod (4910), and the upper end surface of the lifting rod (4910) is provided with a flanging frame (4911); promote post (48) upwards jacking drive jacking slider (492) upward movement, promote trapezoidal slider (493) and remove to both ends, drive ball ejector pin (494) simultaneously and remove to both sides and drive dwang (496) and rotate and drive and push down slider (497) downstream in round groove piece (495), promote horizontal push rod (498) and move to the inboard, extrude gas storage bag A (499) inside air and promote jacking rod (4910) upward movement, thereby reach turn-ups's mesh.

2. The integrated ceiling aluminous gusset plate manufacturing and compression molding machine according to claim 1, is characterized in that: hard rubber is arranged on the outer surface of the flanging frame (4911).

3. The integrated ceiling aluminous gusset plate manufacturing and compression molding machine according to claim 1, is characterized in that: the upper end face of the die core frame (34) is provided with a rectangular blind groove, and the inclination from the upper end face of the blind groove to the bottom face is 135 degrees.

4. The integrated ceiling aluminous gusset plate manufacturing and compression molding machine according to claim 1, is characterized in that: the die core frame (34) comprises a rotating handle (341), an advancing rod (342), a pressed rod (343), an air storage bag B (344), a jacking push rod (345) and a sliding bottom surface (346), the die core frame (34) is of a shell structure, the rotating handle (341) penetrates through the die core frame (34) in a threaded connection mode, the left end of the rotating handle (341) is provided with the advancing rod (342), the left end of the advancing rod (342) abuts against the pressed rod (343), one end of the pressed rod (343) is located inside the air storage bag B (344), the air storage bag B (344) is installed on the inner wall of the die core frame (34), the upper end of the left side of the air storage bag B (344) is provided with the jacking push rod (345), and the upper end of the jacking push rod (345) abuts against the sliding bottom surface.

5. The integrated ceiling aluminous gusset plate manufacturing and compression molding machine according to claim 4, is characterized in that: even spiral patterns are arranged at the holding position of the rotating handle (341).

6. The compression molding method of the compression molding machine for manufacturing the integrated ceiling aluminous gusset plate according to claim 4, which is characterized by comprising the following steps of:

s1, placing an aluminum plate to be processed on a die core frame (34), manually pulling a positioning buckle (35), and fixing the aluminum plate on the die core frame (34);

s2, manually rotating a rotating handle (341), adjusting the depth of the die core frame (34) to a designed size, and manually installing a required forming press block (24);

s3, after the hydraulic cylinder A starts to work to drive the forming press block (24) to be pressed down to the maximum depth, the four edges of the aluminum plate to be processed are tilted to a certain angle, the hydraulic cylinder B starts to work to drive the flanging suite (4) to work, and the four tilted edges are flattened, so that the purpose of flanging is achieved;

s4, the hydraulic cylinder A and the hydraulic cylinder B work, the flanging suite (4) stops working, the forming press block (24) rises, and a finished product is manually taken out of the die core frame (34) to achieve the purpose of taking out the finished product;

and S5, repeating the motions of S3 and S4 to complete the punching and flanging treatment of the aluminum product to be processed.

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