CN115230004A - Board compounding former is moulded to PVC wood - Google Patents

Abstract

The invention discloses a PVC wood-plastic board mixing and forming device, which comprises a mixing mechanism, an extruder and a forming mechanism, wherein the extruder is connected with the mixing mechanism; the mixing mechanism comprises a mixing box, a feed inlet is formed in the top of the mixing box, a mixing motor is fixedly mounted on one side of the mixing box, a mixing rotating plate is fixedly connected to the output end of the mixing motor, a stirring shaft is fixedly connected to the middle of the mixing rotating plate, and two spiral stirring plates which are symmetrically arranged are fixedly connected to two ends of the stirring shaft; a discharge opening is formed in one side of the bottom of the mixing box, and a material guide pipe is arranged below the mixing box; according to the invention, the rotation of the two spiral stirring plates pushes the raw materials along the axial direction of the stirring shaft, so that the stirring uniformity is improved, the stirring of the raw materials is realized by matching the rotation of the stirring rods, and the stirring arc plates are arranged in the middle of the stirring rods, so that the fishing and stirring capabilities of the stirring rods on the raw materials are improved, and the material mixing efficiency is improved.

Description

A kind of PVC wood-plastic board mixing molding equipment

technical field

The invention relates to the technical field of PVC board production, in particular to a PVC wood-plastic board mixing and forming equipment.

Background technique

PVC wood-plastic board has the advantages of waterproof, moisture-proof, mildew resistance, weather resistance, corrosion resistance, etc. It can solve the problem that traditional wood products are easy to rot and expand and deform after absorbing water in humid and watery environments. It is mainly made of wood as the base material, combined with PVC and processing aids, etc., mixed evenly, and then heated and extruded by mold equipment.

Patent No. CN210256802U discloses a mixing equipment for PVC wood-plastic board processing, which drives the sliding seat to move back and forth through the setting of a servo motor and other structures, and the sliding seat moves back and forth to drive the rotating column and rotate to mix the materials in the fixed groove. In this mixing method, the uniformity of mixing and mixing is insufficient, and additional equipment is required to carry out material reclaiming and transferring operations during subsequent extrusion and molding operations, resulting in low work efficiency of the overall mixing and molding process.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a PVC wood-plastic board compound molding equipment to solve the problems raised in the above background technology.

To achieve the above object, the present invention provides the following technical solutions:

A PVC wood-plastic board mixing and forming equipment, comprising a mixing mechanism for mixing raw materials, an extruder for melting and extruding the mixed raw materials, and a molding mechanism for forming and pressing the extruded raw materials ;

The mixing mechanism includes a mixing box, the top of the mixing box is provided with a feeding port, a mixing motor is fixedly installed on one side of the mixing box, and the output end of the mixing motor is fixedly connected with a mixing machine. A material rotating plate, the edge of the mixing rotating plate is fixedly connected with several stirring rods arranged at equal angles, and the middle parts of the several stirring rods are fixedly connected with a stirring arc plate; the middle part of the mixing rotating plate is fixed A stirring shaft is connected, and both ends of the stirring shaft are fixedly connected with a spiral stirring plate, and the two spiral stirring plates are arranged symmetrically with each other; a discharge port is opened on one side of the bottom of the mixing box, and the discharge A discharge plate is rotatably connected to the inner wall of the port, a discharge cylinder is fixedly installed on the other side of the bottom of the mixing box, and a discharge push plate is fixedly connected to the output end of the discharge cylinder. The bottom is rotatably connected with a docking plate, and the top of the docking plate is slidingly connected with the bottom of the stripping plate;

The bottom of the mixing box is provided with a material guide pipe, the top of the material guide pipe is set corresponding to the bottom of the discharge port, the inner wall of the material guide pipe is fixedly installed with a material guide conveyor belt, and the inner wall of the material guide pipe is fixed with a material guide conveyor belt. The bottom is set corresponding to the feed end of the extruder;

The output end of the extruder is provided with a guide groove, the inner wall of the guide groove is rotatably installed with several guide rollers, one end of the guide groove is fixedly connected with the forming box, and the forming mechanism includes a forming box , the forming box is provided with a guide port at the position corresponding to the end of the guide groove, one side of the inner wall of the forming box is fixedly connected with a material guide plate, the top surface of the material guide plate is inclined, and the material guide plate is The higher end of the guide plate is set corresponding to the bottom of the guide port, the lower end of the guide plate is rotatably connected with a guide roller, the cutting knife is fixedly installed above the guide plate, and the lower part of the guide plate is fixedly installed There is a push cylinder, the output end of the push cylinder is fixedly connected with a push frame, and the inner wall of the push frame is rotatably connected with a push guide roller;

A push plate is fixedly installed at the bottom of the inner wall of the molding box, a push guide rail is fixedly installed on the edge of the top of the push plate, a molding groove is slidably installed on the inner wall of the pushing guide rail, and a molding cylinder is fixedly installed on the top of the inside of the molding box. , the output end of the molded cylinder is fixedly connected with a molded plate; a cooling unit is arranged below the molded plate, and the cooling unit includes two symmetrically arranged side cooling plates, between the two side cooling plates A lower cooling plate is provided. The lower cooling plate is embedded in the middle of the push plate. The lower cooling plate and the two side cooling plates are embedded with refrigeration pipes. One side of the refrigeration pipe is fixedly connected to the external refrigeration equipment through a communication pipe;

A discharge port is opened at the bottom of one side of the forming box, a support bracket is fixedly connected to one side of the discharge port, and one end of the push plate extends into the support bracket;

As a further solution of the present invention: the other end of the push plate is provided with an air supply unit, the air supply unit includes an air supply plate, the air supply plate is embedded in the inner wall of the molding box, and the middle part of the air supply plate Several air inlet pipes are fixedly connected, and several air inlet pipes are connected with the output end of the external air supply equipment.

As a further solution of the present invention: a temporary storage box is arranged above the mixing box, a top cover is rotatably connected to the top of the temporary storage box, a feeding port is opened on one side of the temporary storage box, and the temporary storage box is The bottom of the box is provided with a through port, and the bottom of the through port is correspondingly arranged with the top of the feed port. Both sides of the inner wall of the temporary storage box are fixedly connected with inclined plates, and the interiors of the two inclined plates are fixedly installed. There is a feeding cylinder, and the output end of the feeding cylinder is fixedly connected with a closing plate. When the two feeding cylinders extend to the limit position, one end of the two closing plates is in contact with each other to block and seal the port.

As a further solution of the present invention, a feeding hopper is fixedly connected to one side of the feeding port, and a plurality of powder pressing rollers arranged in a staggered position are rotatably connected to the inner wall of the feeding hopper.

As a further solution of the present invention, a pressing frame is fixedly connected to one end of the top of the guide groove close to the extruder, and two calendering rollers are rotatably installed inside the pressing frame.

Compared with the prior art, the beneficial effects of the present invention are: the present invention utilizes two spiral stirring plates to be symmetrically arranged with each other during mixing and stirring, so that the rotation of the two spiral stirring plates can push the raw materials along the axial direction of the stirring shaft. in order to improve the stirring uniformity; with the rotation of several stirring rods, the stirring of the raw materials is realized. The raw materials at the bottom and side walls of the material box can also be fully scraped to improve the mixing efficiency; after the mixing is completed, the unloading cylinder drives the movement of the docking plate and other structures, and then drives the unloading plate to turn over and open to realize the automatic unloading of the raw materials. The material operation, combined with the structure of the material guide pipe and the guide groove, realizes a high degree of automation in the overall mixing and forming process, thereby improving the production efficiency;

The present invention realizes the guiding of the extruded raw materials through the cooperation of the guide groove and several guide rollers, and calenders and expands the extruded distance by setting calendering rollers to form a belt shape, which is convenient for subsequent molding. When the raw materials are evenly stacked in the molding groove; during the conveying process of the strip-shaped raw materials, the pushing cylinder is used to drive the sliding guide roller to move back and forth, so that the strip-shaped raw materials can form multi-layer butt joints in the molding groove, which effectively improves the mold groove. The uniformity of the distribution of the internal raw materials facilitates the subsequent molding operation; by setting a cooling unit, during the molding operation, the molding tank is cooled to accelerate the cooling and setting of the raw materials; the molding tank is driven by the push rail to move, so that it can accept the strip-shaped raw materials. The feeding level of the machine corresponds to the reciprocating movement between the molding position at the bottom of the molding plate and the discharging position on the top surface of the support bracket, so as to realize the automatic and continuous process of the molding process.

Description of drawings

Fig. 1 is the perspective view of the present invention;

Fig. 2 is the sectional view of the mixing mechanism of the present invention;

Fig. 3 is the front sectional view of the molding mechanism of the present invention;

Figure 4 is a side sectional view of the molding mechanism of the present invention;

Figure 5 is a cross-sectional view of the feed hopper of the present invention.

In the figure: 1. Mixing box; 2. Temporary storage box; 3. Feeding hopper; 4. Feeding pipe; 5. Extruder; 6. Feeding groove; 7. Forming box; 8. Mixing motor; 9, stirring rod; 10, stirring arc plate; 11, stirring shaft; 12, screw stirring plate; 13, discharge plate; 14, discharge cylinder; 15, material guide conveyor belt; 16, material guide plate; 17, push Cylinder; 18, push guide roller; 19, guide roller; 20, air supply plate; 21, air inlet pipe; 22, push plate; 23, molded groove; 24, molded plate; 25, refrigeration pipe; 26, side Side cooling plate; 27, powder pressing roller; 28, closing plate; 29, inclined plate; 30, calendering roller; 31, guide roller; 32, top cover; 33, cutting knife.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1-FIG. 5. In the embodiment of the present invention, a PVC wood-plastic board mixing and molding equipment includes a mixing mechanism for mixing raw materials, and an extrusion mechanism for melting and extruding the mixed materials. Machine 5 and a molding mechanism for molding and pressing the extruded raw materials;

The mixing mechanism includes a mixing box 1, the top of the mixing box 1 is provided with a feeding port, a mixing motor 8 is fixedly installed on one side of the mixing box 1, and the output end of the mixing motor 8 is fixedly connected with a mixing rotating plate , the edge of the mixing rotary plate is fixedly connected with a number of stirring rods 9 arranged at equal angles, and the middle parts of several stirring rods 9 are fixedly connected with a stirring arc plate 10. The stirring arc plate 10 is made of flexible materials, and its width Satisfy that the edge can be in contact with the inner wall and bottom of the mixing box 1 during rotation; the stirring motor drives the rotation of several stirring rods 9 to realize the stirring of the raw materials, and the stirring arc plate 10 is arranged in the middle of the stirring dry to improve the stirring. The ability of the rod 9 to pick up and stir the raw materials enables the raw materials attached to the bottom and side walls of the mixing box 1 to be fully scraped to improve the mixing efficiency;

A stirring shaft 11 is fixedly connected to the middle of the mixing rotary plate, and two ends of the stirring shaft 11 are fixedly connected to a spiral stirring plate 12. The two spiral stirring plates 12 are arranged symmetrically with each other, that is, the spiral directions of the two spiral stirring plates 12 are opposite. In this embodiment, when the stirring motor drives the stirring shaft 11 to rotate, the rotation direction of the two spiral stirring plates 12 is sufficient to push the raw material to the middle of the stirring shaft 11 . The rotation of the stirring plate 12 can drive the raw material to move to both ends of the stirring shaft 11, thereby improving the stirring uniformity;

One side of the bottom of the mixing box 1 is provided with a discharge port, the inner wall of the discharge port is rotatably connected with a discharge plate 13, and the other side of the bottom of the mixing box 1 is fixedly installed with a discharge cylinder 14. The output of the discharge cylinder 14 The end is fixedly connected with a discharge push plate, the bottom of the discharge push plate is rotatably connected with a docking plate, the top of the docking plate is slidably connected with the bottom of the discharge plate 13, and the discharge cylinder 14 drives the structure such as the docking plate to move, thereby driving the discharge The material plate 13 is turned over and opened to realize the automatic unloading operation of the raw materials;

In order to facilitate the automatic feeding of raw materials and complete the feeding operation of the extruder 5, a material guide pipe 4 is arranged below the mixing box 1, and the top of the material guide pipe 4 is set corresponding to the bottom of the discharge port. The inner wall of 4 is fixedly installed with a material guide conveyor belt 15, and the bottom of the material guide pipe 4 is set corresponding to the feeding end of the extruder 5;

The output end of the extruder 5 is provided with a guide groove 6, the inner wall of the guide groove 6 is rotatably installed with a number of guide rollers 31, and the top of the guide groove 6 is fixedly connected to one end of the extruder 5 with a pressing frame, which is used for pressing. Two calendering rollers 30 arranged at intervals are installed in the interior of the material rack. The calendering roller 30 located below has the same height as the top surface of the guide roller 31. The cooperation of the guide rollers 31 realizes the guide of the extruded raw materials. By setting the calendering rollers 30, the extruded distance is rolled and expanded to form a belt shape, which is convenient for the subsequent molding of the raw materials in the molding groove 23. uniform stacking within;

One end of the guide groove 6 is fixedly connected with the forming box 7, and the forming mechanism includes a forming box 7. The forming box 7 is provided with a guide port at the position corresponding to the end of the guide groove 6, and one side of the inner wall of the forming box 7 is fixedly connected with a guide. Material plate 16, the top surface of the material guide plate 16 is inclined and arranged, and the higher end of the material guide plate 16 is arranged corresponding to the bottom of the guide port, and the lower end of the material guide plate 16 is rotatably connected with a guide roller 19, which guides the guide plate 16. A cutting knife 33 is fixedly installed on the top of the plate, a pusher cylinder 17 is fixedly installed under the guide plate 16, a pusher frame is fixedly connected to the output end of the pusher cylinder 17, and a pusher guide roller 18 is rotatably connected to the inner wall of the pusher frame; During the feeding of the raw materials, the push cylinder 17 is used to drive the push rollers 18 to move back and forth, so that the strip-shaped raw materials can form multi-layer butt joints in the molding groove 23, which effectively improves the distribution uniformity of the raw materials in the molding groove and facilitates subsequent processing. molding operation;

The bottom of the inner wall of the molding box 7 is fixedly installed with a push plate 22, the edge of the top of the push plate 22 is fixedly installed with a push guide rail, and the inner wall of the push guide rail is slidably installed with a molding groove 23. The feeding position of the raw material corresponds to the reciprocating movement between the molding position at the bottom of the molding plate 24 and the discharging position on the top surface of the support bracket, so as to realize the automatic and continuous process of the molding process;

The top inside the molding box 7 is fixedly installed with a molding cylinder, and the output end of the molding cylinder is fixedly connected with a molding plate 24; a cooling unit is arranged below the molding plate 24, and the cooling unit includes two symmetrically arranged side cooling plates 26, two A lower cooling plate is arranged between the side cooling plates 26. The lower cooling plate is embedded in the middle of the push plate 22. The lower cooling plate and the interior of the two side cooling plates 26 are embedded with refrigeration pipes 25. Refrigerant is circulated inside, and one side of the refrigeration pipe 25 is fixedly connected to the external refrigeration equipment through a communication pipe; by setting a cooling unit, during the molding operation, the molding groove 23 is cooled to accelerate the cooling and shaping of the raw materials; the molding box 7 The bottom of one side is provided with a discharge port, one side of the discharge port is fixedly connected with a bearing bracket, and one end of the push plate extends into the bearing bracket;

The other end of the push plate 22 is provided with an air supply unit. The air supply unit includes an air supply plate 20. The air supply plate 20 is embedded in the inner wall of the molding box 7. A number of air inlet pipes 21 are fixedly connected to the middle of the air supply plate 20. Several air inlet pipes 21 are connected with the output end of the external air supply equipment. By setting the air supply unit, when the strip-shaped raw material 4 is poured into the mold groove, it is blown to cool down, which is convenient for the setting operation during subsequent molding.

The top of the mixing box 1 is provided with a temporary storage box 2, the top of the temporary storage box 2 is rotatably connected with a top cover 32, one side of the temporary storage box 2 is provided with a feeding port, and the bottom of the temporary storage box 2 is provided with a through port, through which the The bottom of the port is set correspondingly to the top of the feeding port, the two sides of the inner wall of the temporary storage box 2 are fixedly connected with inclined plates 29, the inside of the two inclined plates 29 are fixedly installed with a feeding cylinder, and the output end of the feeding cylinder is fixed. A closing plate 28 is connected. When the two feeding cylinders extend to the limit position, one end of the two closing plates 28 is in contact with each other to block and seal the opening; Temporary storage is carried out, so that when the mixing box 1 is performing the mixing operation, the next batch of raw materials can be stored in advance in a proportion, so as to improve the production efficiency.

One side of the feeding port is fixedly connected with the feeding hopper 3, and the inner wall of the feeding hopper 3 is rotatably connected with a number of powder pressing rollers 27 arranged in dislocation. The large particles are rolled and crushed to improve the uniformity of the material, so as to facilitate the subsequent mixing and extrusion operations.

When the present invention is in use, the raw materials for producing PVC wood-plastic panels are fed into the feeding hopper 3 from the feeding port, and several material-separating pressure rollers are rotated to crush and crush the large-particle raw materials, and the raw materials are pushed into the temporary storage box. 2. When all the raw material feeding operations are completed, the two feeding cylinders are activated to drive the two closing plates 28 to retract, so that the port is opened, and the raw material passes through the port and enters the mixing box 1 from the feeding port;

The mixing motor 8 starts to drive the mixing rotary plate to rotate, and then drives a number of stirring rods 9 and the stirring arc plate 10 to rotate to turn the raw materials over and stir. The rotation of the plate 12 pushes the raw materials in the direction of the middle of the mixing box 1, so as to achieve sufficient and uniform stirring and mixing of the raw materials in the mixing box 1;

After the mixing is completed, the unloading cylinder 14 is activated to drive the unloading push plate and the docking plate to retract, so that the unloading plate 13 is turned over and opened, and the raw materials are discharged from the unloading port, and fall into the guide pipe 4 along the unloading plate 13, and pass through the guide. The conveyor belt 15 undertakes the raw material, and the raw material is fed into the extruder 5 through the rotation of the material guide conveyor belt 15 . After passing through, the raw material is rolled into a belt shape by the rotation of the two calendering rollers 30, and then the belt-shaped raw material is fed into the forming box 7 from the guide port by the rotation of several guide rollers 31;

The strip-shaped raw material entering the forming box 7 falls along the guide plate, and then goes around the guide roller 19 and falls into contact with the side of the push guide roller 18, and then the push cylinder 17 starts to push the strip-shaped raw material to move, so that the end of the strip is moved. The bottom part is opened and dropped in the molding groove 23, and then the cylinder 17 is pushed to drive the sliding guide roller 18 to reciprocate, and cooperate with the conveying and falling of the raw material, so that the strip-shaped raw material falling into the molding groove 23 is bent and stacked layer by layer. When the length of the strip-shaped raw material is When the requirements of molding are met, the cutting knife 33 starts the work to cut off the strip-shaped raw material;

During the process of feeding the raw material into the molding groove 23, the external air supply equipment sends air flow to several air supply pipes to cool the strip-shaped raw material. When the raw material is completely fed into the molding groove, the molding groove 23 is driven by the push rail. Move to the bottom of the molding plate 24, the molding plate 24 is driven by the molding cylinder to press down, and the raw material in the molding groove 23 is pressed and formed. The temperature is lowered, thereby realizing the cooling of the molding groove 23 and the raw materials, and accelerating the setting speed of the raw materials, and then the molding cylinder drives the molding plate 24 to move up and reset, and the molding groove 23 is sent out from the discharge port by the push rail.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art , without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or modifications to equivalent embodiments of equivalent changes, as long as it does not depart from the technical solution content of the present invention, according to the technical solution of the present invention Substantially any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims (8)

1. A PVC wood-plastic board mixing and forming equipment, comprising a mixing mechanism, an extruder (5) and a molding mechanism; it is characterized in that, the mixing mechanism comprises a mixing box (1), the mixing box The top of (1) is provided with a feeding port, a mixing motor (8) is fixedly installed on one side of the mixing box (1), and a mixing rotating plate is fixedly connected to the output end of the mixing motor (8). , a stirring shaft (11) is fixedly connected to the middle of the mixing rotating plate, and two spiral stirring plates (12) are symmetrically arranged at both ends of the stirring shaft (11); A discharge port is opened on one side, a material guide pipe (4) is arranged below the mixing box (1), and the bottom of the material guide pipe (4) is correspondingly arranged with the feeding end of the extruder (5). ; The output end of the extruder (5) is provided with a guide groove (6), and several guide rollers (31) are rotatably installed on the inner wall of the guide groove (6), and the forming mechanism includes a forming box ( 7), one end of the guide groove (6) is fixedly connected with the molding box (7), the bottom of the inner wall of the molding box (7) is fixedly installed with a push plate (22), and the top of the push plate (22) is fixedly installed. A push guide rail is fixedly installed on the edge, a molding groove (23) is slidably installed on the inner wall of the push guide rail, a molding cylinder is fixedly installed on the top of the inside of the molding box (7), and a molding plate is fixedly connected to the output end of the molding cylinder. (24); a discharge port is provided at the bottom of one side of the forming box (7). 2. A PVC wood-plastic board mixing molding equipment according to claim 1, characterized in that, one end of the push plate (22) is provided with an air supply unit, and the air supply unit comprises an air supply plate (20). ), a plurality of air inlet pipes (21) are fixedly connected to the middle of the air supply plate (20). 3. A PVC wood-plastic board compound molding equipment according to claim 1, characterized in that, a cooling unit is provided below the molded plate (24), and the cooling unit comprises two symmetrically arranged sides A cooling plate (26), a lower cooling plate is arranged between the two side cooling plates (26), the lower cooling plate is embedded in the middle of the push plate (22), the lower cooling plate and the two side cooling plates Refrigeration pipes (25) are embedded inside the side cooling plates (26). 4. A PVC wood-plastic board mixing molding equipment according to claim 1, characterized in that, a material guide plate (16) is fixedly connected to one side of the inner wall of the molding box (7), and the material guide plate is One end of (16) is rotatably connected with a guide roller (19), a pusher cylinder (17) is fixedly installed under the material guide plate (16), and a pusher frame is fixedly connected to the output end of the pusher cylinder (17). , the inner wall of the push frame is rotatably connected with a push guide roller (18). 5. A PVC wood-plastic board mixing and forming equipment according to claim 1, wherein a temporary storage box (2) is arranged above the mixing box (1), and the temporary storage box (2) ) is provided with a feeding port on one side, the bottom of the temporary storage box (2) is provided with a through port, the bottom of the through port is correspondingly arranged with the top of the feeding port, and the two inner walls of the temporary storage box (2) are provided with a through port. A sloping plate (29) is fixedly connected to the sides, a feeding cylinder is fixedly installed inside the two sloping plates (29), and a closing plate (28) is fixedly connected to the output end of the feeding cylinder. 6. A PVC wood-plastic board mixing molding equipment according to claim 5, characterized in that, a feeding hopper (3) is fixedly connected to one side of the feeding port, and the feeding hopper (3) is The inner wall is rotatably connected with a number of staggered powder pressing rollers (27); one end of the top of the guide groove (6) close to the extruder (5) is fixedly connected with a pressing frame, and the inside of the pressing frame is Two calender rolls (30) are rotatably installed. 7. A PVC wood-plastic board mixing and molding equipment according to claim 1, characterized in that a discharge plate (13) is rotatably connected to the inner wall of the discharge port, and the bottom of the mixing box (1) is rotatably connected with a discharge plate (13). A discharge cylinder (14) is fixedly installed on the other side of the discharge cylinder, the output end of the discharge cylinder (14) is fixedly connected with a discharge push plate, and a docking plate is rotatably connected to the bottom of the discharge push plate. The top of the plate is slidably connected to the bottom of the stripper plate (13). 8. A kind of PVC wood-plastic board mixing molding equipment according to claim 1, is characterized in that, the edge of described mixing rotating plate is fixedly connected with several stirring rods (9) arranged at equal angles, and several A stirring arc plate (10) is fixedly connected to the middle of the stirring rod (9).

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