Plastic production raw material mixing device

Abstract

The utility model is suitable for the technical field of plastic production, and provides a plastic production raw material mixing device which comprises a mixing box, the mounting frame is arranged in the mixing box; the pair of scraping plates are fixedly mounted on the two sides of the mounting frame respectively, and the scraping plates are in sliding contact with the inner wall of the mixing box; the stirring rods are rotationally mounted on the scraping plate; the plurality of stirring plates are fixedly arranged on the stirring rod; and the sealing plates are arranged on the mounting frame, and the sealing plates can seal the discharging opening of the mounting frame. According to the plastic production raw material mixing device provided by the scheme, high-temperature hot air in the mixing box can be prevented from being conducted into the feeding opening, and the situation that when raw materials are added subsequently, the temperature of the inner wall of the feeding opening is too high, and plastic raw materials are melted and adhere to the inner wall of the feeding opening is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic production, and in particular relates to a plastic production raw material mixing device. Background Art

[0002] Plastics are high molecular compounds (macromolecules) made from monomers through addition polymerization or condensation polymerization. They have a medium deformation resistance, between fiber and rubber. They are composed of synthetic resins and additives such as fillers, plasticizers, stabilizers, lubricants, and colorants.

[0003] After the existing plastic production raw materials and other additives are put into the mixing box through the feed port, they need to be heated and stirred at the same time. However, due to the high temperature in the mixing box, the heat will be transferred to the feed port, resulting in a high temperature of the inner wall of the feed port. When materials are subsequently added to the mixing box through the feed port, the plastic raw materials are prone to melt and stick to the inner wall of the feed port, resulting in a waste of raw materials. Utility Model Content

[0004] The utility model provides a plastic production raw material mixing device, aiming to solve the problem raised in the above background technology that when adding raw materials into a mixing box through a feed inlet, the feed inlet is easily conducted by the higher temperature in the mixing box, resulting in a higher temperature of the inner wall thereof, and the plastic raw materials are easily melted and adhered to the inner wall of the feed inlet when the raw materials are subsequently added, resulting in a waste of raw materials.

[0005] To solve the above problems, the utility model is implemented as follows: a plastic production raw material mixing device, comprising: a mixing box; a mounting frame, the mounting frame is arranged in the mixing box; a pair of scrapers, the pair of scrapers are respectively fixedly mounted on both sides of the mounting frame, and the scrapers are in sliding contact with the inner wall of the mixing box; a pair of stirring rods, the stirring rods are rotatably mounted on the scrapers; a plurality of stirring plates, the stirring plates are fixedly mounted on the stirring rods; a pair of closing plates, the closing plates are arranged on the mounting frame, and the closing plates can close the discharge port of the mounting frame; a driving mechanism, the driving mechanism is arranged in the mixing box, the driving mechanism is used to drive the scrapers to rotate to stir the plastic raw materials; an adjusting mechanism, the adjusting mechanism is arranged in the mixing box, the adjusting mechanism is used to adjust the state of the closing plate.

[0006] Preferably, the driving mechanism comprises a driving cylinder rotatably mounted on the top of the mixing box, a driving motor is fixedly mounted on the top of the mixing box, and an output shaft of the driving motor is engaged with a bevel gear fixedly mounted on the driving cylinder.

[0007] Preferably, the adjustment mechanism includes a support groove opened at the bottom of the mounting frame, support rods are rotatably installed on both sides of the support groove, the closing plate is fixedly connected to the support rods, and a pair of support plates are arranged under the mounting frame, and the support plates are in contact with the closing plate.

[0008] Preferably, threaded sleeves are rotatably installed on both sides of the mounting frame, threaded rods are threadedly installed on the threaded sleeves, and the threaded rods slide through one side below the mounting frame and are fixedly connected to the support plate. Lifting motors are fixedly installed on both sides of the mounting frame, and the output shaft of the lifting motor is fixedly installed with a meshing bevel gear 2 on the threaded sleeve.

[0009] Preferably, guide grooves are provided on both sides of the driving cylinder, and guide blocks are fixedly mounted on the threaded rod. The guide blocks extend into the guide grooves and are in sliding contact with the inner walls of the guide grooves.

[0010] Preferably, a gear ring is fixedly mounted on the inner wall of the top of the mixing box, and an auxiliary gear is fixedly mounted on the stirring rod, and the auxiliary gear is meshed with the gear ring.

[0011] Preferably, a feed hopper is rotatably mounted on the top of the driving cylinder, a fixing plate is fixedly mounted on the feed hopper, the fixing plate is fixedly connected to the mixing box, and a heating plate is fixedly mounted on the inner wall of the mixing box.

[0012] Compared with the related art, the plastic production raw material mixing device provided by the utility model has the following beneficial effects:

[0013] Compared with the prior art, the present solution provides, in summary, compared with the related technology, firstly, through the design of components such as the driving cylinder and the stirring rod, efficient stirring of the plastic raw materials is achieved, ensuring uniform mixing of the raw materials and improving the quality and consistency of the products.

[0014] Secondly, through the flexible control of the adjustment mechanism, the opening and closing of the discharge port becomes convenient and quick, which not only facilitates the addition and mixing of raw materials, but also avoids the higher temperature in the mixing box from being transmitted to the feed channel, solving the problem of raw materials sticking to the inner wall of the feed channel.

[0015] In addition, the design of the guide groove and guide block enhances the stability during the lifting process, improves the accuracy and reliability of the operation, and further enhances the performance of the device.

[0016] Finally, the installation of the heating plate enables the raw materials to be evenly heated during the mixing process, which promotes the softening and mixing effects of the raw materials, and further improves the quality and production efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of a plastic production raw material mixing device provided by the utility model;

[0018] Figure 2 This is a schematic diagram of the main cross-sectional structure of a plastic production raw material mixing device provided by the utility model;

[0019] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A shown in FIG.

[0020] Figure numerals: 1. mixing box; 2. mounting frame; 3. scraper; 4. stirring rod; 5. stirring plate; 6. closing plate; 7. driving cylinder; 8. driving motor; 9. bevel gear one; 10. supporting groove; 11. supporting rod; 12. supporting plate; 13. threaded sleeve; 14. threaded rod; 15. lifting motor; 16. bevel gear two; 17. guide groove; 18. guide block; 19. gear ring; 20. auxiliary gear; 21. feed hopper; 22. fixing plate; 23. heating plate. DETAILED DESCRIPTION

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order; the terms "inside", "outside", "left", and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] The utility model provides a device for mixing raw materials for plastic production, such as Figure 1-3As shown, the plastic production raw material mixing device includes: a mixing box 1; a mounting frame 2, the mounting frame 2 is arranged in the mixing box 1; a pair of scrapers 3, the pair of scrapers 3 are respectively fixedly mounted on both sides of the mounting frame 2, and the scrapers 3 are in sliding contact with the inner wall of the mixing box 1; a pair of stirring rods 4, the stirring rods 4 are rotatably mounted on the scrapers 3; a plurality of stirring plates 5, the stirring plates 5 are fixedly mounted on the stirring rods 4; a pair of closing plates 6, the closing plates 6 are arranged on the mounting frame 2, and the closing plates 6 can close the discharge port of the mounting frame 2; a driving mechanism, the driving mechanism is arranged in the mixing box 1, and the driving mechanism is used to drive the scrapers 3 to rotate to stir the plastic raw materials; an adjusting mechanism, the adjusting mechanism is arranged in the mixing box 1, and the adjusting mechanism is used to adjust the state of the closing plate 6.

[0024] In this embodiment, the device mainly includes a mixing box 1, a mounting frame 2, a scraper 3, a stirring rod 4, a stirring plate 5, a closing plate 6, a driving mechanism and an adjusting mechanism. The design of this device is to solve the problem of raw materials melting and sticking at the feed port due to the high temperature of the mixing box 1 during the plastic production process, and also improve the uniformity and efficiency of raw material mixing.

[0025] First, the mixing box 1 is the main place for mixing raw materials, and the mounting frame 2 inside it carries the scraper 3 and the stirring mechanism. The scrapers 3 fixed on both sides of the mounting frame 2 are cleverly designed to scrape off the raw materials stuck to the inner wall of the mixing box 1 while stirring, preventing the waste of raw materials. At the same time, the sliding contact between the scraper 3 and the inner wall of the mixing box 1 ensures smooth mixing.

[0026] Secondly, the combined design of the stirring rod 4 and the stirring plate 5 enables the raw materials to be fully stirred in the mixing box 1, thereby improving the uniformity of mixing. The stirring rod 4 is rotatably mounted on the scraper 3, while the stirring plate 5 is fixedly mounted on the stirring rod 4. This design makes the stirring process more stable and can also cover a larger mixing range.

[0027] In addition, the design of the closing plate 6 is an optimization of the discharge port. The closing plate 6 can close the discharge port of the mounting frame 2 to prevent the higher temperature in the mixing box 1 from being transmitted to the feed channel through the discharge port, resulting in a higher temperature on the inner wall of the feed channel and causing the plastic raw materials to stick.

[0028] The driving mechanism is the power source of the entire mixing device, which is arranged in the mixing box 1 and is used to drive the scraper 3 to rotate for stirring. This design makes the stirring process more automated and improves production efficiency.

[0029] Finally, the adjustment mechanism is used to adjust the state of the closing plate 6. According to production needs, the opening and closing of the closing plate 6 can be adjusted at any time, making the operation of the entire device more flexible.

[0030] In a further preferred embodiment of the utility model, the driving mechanism includes a driving cylinder 7 rotatably mounted on the top of the mixing box 1, a driving motor 8 is fixedly mounted on the top of the mixing box 1, and the output shaft of the driving motor 8 is engaged with a bevel gear 9 fixedly mounted on the driving cylinder 7.

[0031] In this embodiment, the driving mechanism includes a driving cylinder 7 rotatably mounted on the top of the mixing box 1. This design enables the driving cylinder 7 to be stably supported on the mixing box 1 and to achieve a rotating motion. At the same time, a driving motor 8 is also fixedly mounted on the top of the mixing box 1. This motor serves as the power source of the entire driving mechanism and ensures a stable output of the driving force.

[0032] More importantly, the output shaft of the driving motor 8 is fixedly mounted with a meshing bevel gear 9 on the driving cylinder 7. The design of the bevel gear 9 enables the power output by the driving motor 8 to be efficiently transmitted to the driving cylinder 7, thereby driving the entire stirring mechanism to rotate. This design not only ensures the power transmission efficiency, but also improves the stability and reliability of the entire driving mechanism.

[0033] Combined with the above summary, the design of the driving mechanism provides a stable and reliable power source for the entire device, ensuring the smooth progress of the mixing process. In addition, the design of the scraper 3 can effectively scrape off the raw materials stuck to the inner wall of the mixing box 1, preventing the waste of raw materials.

[0034] In a further preferred embodiment of the utility model, the adjustment mechanism includes a support groove 10 opened at the bottom of the mounting frame 2, support rods 11 are rotatably installed on both sides of the support groove 10, the closing plate 6 is fixedly connected to the support rods 11, and a pair of support plates 12 are arranged under the mounting frame 2, and the support plates 12 are in contact with the closing plate 6.

[0035] In this embodiment, the adjustment mechanism includes a support groove 10 provided at the bottom of the mounting frame 2. This design enables the support groove 10 to stably carry the support rod 11 and the closing plate 6. At the same time, support rods 11 are rotatably mounted on both sides of the support groove 10. This installation method enables the support rod 11 to rotate in the support groove 10, thereby achieving position adjustment of the closing plate 6.

[0036] More importantly, the closing plate 6 is fixedly connected to the support rod 11, which means that when the support rod 11 rotates, the closing plate 6 will also move synchronously. In this way, by adjusting the rotation angle of the support rod 11, the opening and closing state of the closing plate 6 can be conveniently controlled, thereby realizing flexible adjustment of the discharge port.

[0037] In addition, a pair of support plates 12 are provided below the mounting frame 2, and these support plates 12 are in contact with the closing plate 6. The design of the support plates 12 not only increases the stability of the entire structure, but also can support the closing plate 6, making it convenient to adjust the state of the closing plate 6.

[0038] Combined with the above summary, the mixing device achieves flexible adjustment of the discharge port by optimizing the design of the adjustment mechanism, making the operation of the entire device more convenient and efficient. The design of the closing plate 6 also prevents the higher temperature in the mixing box 1 from being conducted to the feed channel, solves the problem of raw materials sticking to the inner wall of the feed channel, and reduces production costs.

[0039] In a further preferred embodiment of the utility model, threaded sleeves 13 are rotatably installed on both sides of the mounting frame 2, and threaded rods 14 are threadedly installed on the threaded sleeves 13. The threaded rods 14 slide through one side below the mounting frame 2 and are fixedly connected to the support plate 12. Lifting motors 15 are fixedly installed on both sides of the mounting frame 2, and the output shaft of the lifting motor 15 is fixedly installed with meshing bevel gears 16 on the threaded sleeves 13.

[0040] In this embodiment, the threaded sleeves 13 are rotatably mounted on both sides of the mounting frame 2, and this design enables the threaded sleeves 13 to stably rotate on the mounting frame 2. At the same time, the threaded sleeves 13 are threadedly mounted with threaded rods 14, and this installation method enables the threaded rods 14 to move up and down in the threaded sleeves 13, thereby realizing the position adjustment of the support plate 12.

[0041] More importantly, the threaded rod 14 slides through one side below the mounting frame 2 and is fixedly connected to the support plate 12, which means that when the threaded rod 14 is raised or lowered, the support plate 12 will also move synchronously. In this way, by controlling the raising or lowering of the threaded rod 14, the relative position between the support plate 12 and the closing plate 6 can be easily adjusted, thereby realizing precise control of the opening and closing state of the closing plate 6.

[0042] In addition, lifting motors 15 are fixedly installed on both sides of the mounting frame 2. These lifting motors 15 serve as the power source of the entire adjustment mechanism to ensure the stability of the adjustment process. The output shaft of the lifting motor 15 is fixedly installed with a meshing bevel gear 2 16 on the threaded sleeve 13. This design enables the power output by the lifting motor 15 to be efficiently transmitted to the threaded sleeve 13, thereby driving the threaded rod 14 to perform lifting and lowering movements.

[0043] Combined with the above summary, the device realizes accurate control of the opening and closing state of the closing plate 6. This design not only improves the automation of the entire device, but also makes the operation more convenient and efficient. The design of the closing plate 6 also prevents the high temperature in the mixing box 1 from being transmitted to the feed channel, solves the problem of raw materials sticking to the inner wall of the feed channel, and reduces production costs.

[0044] In a further preferred embodiment of the utility model, guide grooves 17 are provided on both sides of the driving cylinder 7 , and guide blocks 18 are fixedly mounted on the threaded rod 14 . The guide blocks 18 extend into the guide grooves 17 and are in sliding contact with the inner wall of the guide grooves 17 .

[0045] In this embodiment, guide grooves 17 are provided on both sides of the driving cylinder 7. This design enables the guide grooves 17 to stably carry the guide blocks 18 and provides space for the sliding of the guide blocks 18. At the same time, the guide blocks 18 are fixedly installed on the threaded rod 14. This installation method ensures the synchronous movement of the guide blocks 18 and the threaded rod 14.

[0046] More importantly, the guide block 18 extends into the guide groove 17 and slides in contact with the inner wall of the guide groove 17. This means that when the threaded rod 14 is lifted or lowered, the guide block 18 will slide in the guide groove 17 accordingly, thereby ensuring the stability and accuracy of the lifting or lowering movement of the threaded rod 14. This design not only improves the stability of the entire adjustment mechanism, but also makes the adjustment process smoother and more reliable.

[0047] Combined with the above summary, the device realizes precise control of the entire stirring and mixing process by enhancing the linkage between the driving mechanism and the regulating mechanism. This design not only improves the uniformity and efficiency of mixing, but also reduces production costs and improves production efficiency. In addition, through the synergistic effect of the scraper 3, the stirring rod 4 and the stirring plate 5, the raw materials can be fully stirred and mixed in the mixing box 1, further improving the mixing effect.

[0048] In a further preferred embodiment of the utility model, a gear ring 19 is fixedly mounted on the inner wall of the top of the mixing box 1 , and an auxiliary gear 20 is fixedly mounted on the stirring rod 4 , and the auxiliary gear 20 is meshed with the gear ring 19 .

[0049] In this embodiment, a gear ring 19 is fixedly installed on the inner wall of the top of the mixing box 1. This design enables the gear ring 19 to be stably fixed inside the mixing box 1 and cooperate with the auxiliary gear 20 on the stirring rod 4. At the same time, the auxiliary gear 20 is fixedly installed on the stirring rod 4. This installation method ensures that the auxiliary gear 20 and the stirring rod 4 rotate synchronously.

[0050] More importantly, the auxiliary gear 20 is meshed with the gear ring 19. This means that when the stirring rod 4 rotates, the auxiliary gear 20 will roll on the gear ring 19, thereby achieving comprehensive stirring of the entire interior of the mixing box 1. This design not only improves the uniformity and efficiency of stirring, but also makes the stirring process more stable and reliable.

[0051] In combination with the above summary, the plastic production raw material mixing device of the utility model improves the uniformity and efficiency of stirring by optimizing the design of the mixing box 1, so that the raw materials can be fully mixed in the mixing box 1. At the same time, the synergistic effect of the driving mechanism and the regulating mechanism makes the operation of the entire device more convenient and efficient. In addition, the design of the closing plate 6 also prevents the higher temperature in the mixing box 1 from being transmitted to the feed channel, solves the problem of raw materials sticking to the inner wall of the feed channel, and further improves production efficiency and product quality.

[0052] In a further preferred embodiment of the utility model, a feed hopper 21 is rotatably installed on the top of the driving cylinder 7, a fixed plate 22 is fixedly installed on the feed hopper 21, the fixed plate 22 is fixedly connected to the mixing box 1, and a heating plate 23 is fixedly installed on the inner wall of the mixing box 1.

[0053] In this embodiment, first, the top of the driving cylinder 7 is rotatably mounted with a feed hopper 21. This design not only facilitates the addition of raw materials, but also makes the feeding process smoother. By means of rotatable installation, the feed hopper 21 can adjust the angle as needed to facilitate the feeding of raw materials. At the same time, the fixing plate 22 firmly fixes the feed hopper 21 and the mixing box 1 together, thereby enhancing the structural stability of the entire device.

[0054] Secondly, a heating plate 23 is fixedly installed on the inner wall of the mixing box 1. The design of the heating plate 23 enables the mixing box 1 to maintain a certain temperature during the stirring process, which is conducive to the full mixing and reaction of the raw materials. Through the action of the heating plate 23, the melting and mixing process of the raw materials can be accelerated, and the production efficiency can be improved.

[0055] Combined with the above comprehensive summary, the plastic production raw material mixing device of the utility model improves production efficiency and product quality by improving the overall design. The optimized design of the drive cylinder 7, the feed hopper 21 and the fixed plate 22 makes the raw material addition and mixing process smoother and more efficient. At the same time, the addition of the heating plate 23 further accelerates the melting and mixing of the raw materials, and improves the uniformity and efficiency of the mixing. In addition, the synergistic effect of the driving mechanism and the regulating mechanism also makes the operation of the entire device more convenient and flexible.

[0056] In summary, compared with the related art, firstly, through the design of components such as the driving cylinder 7 and the stirring rod 4, efficient stirring of the plastic raw materials is achieved, ensuring uniform mixing of the raw materials and improving the quality and consistency of the products.

[0057] Secondly, through the flexible control of the adjustment mechanism, the opening and closing of the discharge port becomes convenient and quick, which not only facilitates the addition and mixing of raw materials, but also avoids the higher temperature in the mixing box 1 from being transmitted to the feed channel, solving the problem of raw materials sticking to the inner wall of the feed channel.

[0058] In addition, the design of the guide groove 17 and the guide block 18 enhances the stability during the lifting process, improves the accuracy and reliability of the operation, and further enhances the performance of the device.

[0059] Finally, the installation of the heating plate 23 enables the raw materials to be evenly heated during the mixing process, which promotes the softening and mixing effects of the raw materials and further improves the quality and production efficiency of the product.

[0060] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways.

[0061] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the utility model according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the utility model in essence, and these technical solutions also belong to the scope of protection of the utility model.

Claims

1. A plastic production raw material mixing device, characterized in that: include: Mixing box; A mounting frame, the mounting frame being disposed in the mixing box; A pair of scrapers, the pair of scrapers are fixedly mounted on both sides of the mounting frame, and the scrapers are in sliding contact with the inner wall of the mixing box; a pair of stirring rods, the stirring rods being rotatably mounted on the scraper; A plurality of stirring plates, wherein the stirring plates are fixedly mounted on the stirring rod; A pair of closing plates, the closing plates are arranged on the mounting frame, and the closing plates can close the discharge port of the mounting frame; A driving mechanism, wherein the driving mechanism is disposed in the mixing box and is used to drive the scraper to rotate and stir the plastic raw material; An adjusting mechanism is provided in the mixing box and is used for adjusting the state of the closing plate.

2. The plastic production raw material mixing device according to claim 1, characterized in that: The driving mechanism comprises a driving cylinder rotatably mounted on the top of the mixing box, a driving motor is fixedly mounted on the top of the mixing box, and an output shaft of the driving motor is fixedly mounted with a meshing bevel gear on the driving cylinder.

3. The plastic production raw material mixing device according to claim 2, characterized in that: The adjustment mechanism includes a support groove opened at the bottom of the mounting frame, support rods are rotatably installed on both sides of the support groove, the closing plate is fixedly connected to the support rods, and a pair of support plates are arranged below the mounting frame, and the support plates are in contact with the closing plate.

4. The plastic production raw material mixing device as claimed in claim 3, characterized in that: Threaded sleeves are rotatably installed on both sides of the mounting frame, and threaded rods are threadedly installed on the threaded sleeves. The threaded rods slide through one side below the mounting frame and are fixedly connected to the support plate. Lifting motors are fixedly installed on both sides of the mounting frame, and the output shaft of the lifting motor is fixedly installed with meshing bevel gear 2 on the threaded sleeve.

5. The plastic production raw material mixing device as claimed in claim 4, characterized in that: Guide grooves are provided on both sides of the driving cylinder. A guide block is fixedly mounted on the threaded rod. The guide block extends into the guide groove and is in sliding contact with the inner wall of the guide groove.

6. The plastic production raw material mixing device according to claim 1, characterized in that: A gear ring is fixedly mounted on the inner wall of the top of the mixing box, and an auxiliary gear is fixedly mounted on the stirring rod, and the auxiliary gear is meshed with the gear ring.

7. The plastic production raw material mixing device according to claim 2, characterized in that: A feed hopper is rotatably mounted on the top of the driving cylinder, a fixing plate is fixedly mounted on the feed hopper, the fixing plate is fixedly connected to the mixing box, and a heating plate is fixedly mounted on the inner wall of the mixing box.

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