Centrifugal machine for separating acetaminophen mother liquor

Abstract

The utility model relates to the technical field of centrifugal equipment, in particular to a centrifugal machine for separating acetaminophen mother liquor, which comprises a centrifugal machine body, the centrifugal machine body comprises an outer barrel and a centrifugal filter barrel, a cleaning mechanism is arranged at the upper end of the inner side of the outer barrel and comprises a second motor, and the lower end of the second motor is connected with a supporting shaft. Two first mounting holes which are vertically distributed are formed in the supporting shaft, a first supporting rod and a second supporting rod are arranged in the two first mounting holes in a penetrating mode correspondingly, and a first connecting block and a second connecting block are arranged at one end of the first supporting rod and one end of the second supporting rod correspondingly; the cleaning mechanism in the centrifugal machine can be suitable for cleaning various centrifugal filter barrels with different diameters and depths and outer barrels on the outer sides of the centrifugal filter barrels, the application range of the cleaning mechanism is widened, the utilization rate of the cleaning mechanism is increased, and the cleaning efficiency of the centrifugal machine is improved. The limitation of the cleaning mechanism is reduced.

Description

Technical Field

[0001] This utility model relates to the field of centrifugation equipment technology, and specifically discloses a centrifuge for separating acetaminophen mother liquor. Background Technology

[0002] Acetaminophen, also known as paracetamol or acetaminophen, is a commonly used over-the-counter antipyretic and analgesic drug, belonging to the category of nonsteroidal anti-inflammatory drugs. During the processing of acetaminophen, the mother liquor contains a mixture of mother liquor and crystals. The separation effect of the mother liquor and crystals directly affects the product yield and the reuse of the mother liquor. Therefore, centrifuges are usually used for separation of acetaminophen mother liquor.

[0003] Chinese patent CN220444111U discloses a centrifuge for separating acetaminophen mother liquor, including a centrifuge body and a cleaning mechanism. The centrifuge body includes an outer barrel and a centrifugal filter barrel. A first drive motor is installed through the lower end of the outer barrel, and the drive end of the first drive motor is connected to the bottom of the centrifugal filter barrel. The cleaning mechanism includes two limiting blocks, a support rod, a second drive motor, a first transmission rod, and a first cleaning brush. The two limiting blocks are located above the centrifugal filter barrel and are symmetrically arranged on the inner side wall of the outer barrel along the central axis. The two ends of the support rod are respectively arranged on the two limiting blocks. The second drive motor is located at the center of the support rod, and the drive end of the second drive motor is connected to the first cleaning brush through the first transmission rod. This invention is applicable to the separation of acetaminophen mother liquor. After use, the centrifuge interior can be thoroughly cleaned for future use. However, the distance between the ends of the first, second, and third transmission rods and the second motor is inconvenient to adjust, making these components unsuitable for cleaning centrifuge filter barrels of various diameters and their outer inner walls. This limits the applicability of these components. Furthermore, the length of the cleaning brush in the centrifuge cannot be flexibly adjusted according to the depth of the centrifuge filter barrel and outer barrel, further restricting the centrifuge's applicability and increasing the limitations of the cleaning brush. Therefore, to solve these problems, this invention proposes a centrifuge for separating acetaminophen mother liquor. Utility Model Content

[0004] The present invention aims to provide a centrifuge for separating acetaminophen mother liquor. The cleaning mechanism in the centrifuge is applicable to the cleaning of centrifuge filter barrels of various diameters and depths and their outer barrels, thereby improving the applicability and utilization rate of the cleaning mechanism and reducing its limitations.

[0005] This utility model is achieved through the following technical solution:

[0006] A centrifuge for separating acetaminophen mother liquor includes a centrifuge body, which includes an outer barrel and a centrifugal filter barrel. The centrifugal filter barrel is coaxially arranged inside the outer barrel. A cap is detachably connected to the upper end of the outer barrel. A first motor is connected through the middle of the bottom of the outer barrel. The output end of the first motor is connected to the centrifugal filter barrel. A support is connected to the lower part of the outer barrel and is connected to the first motor. A cleaning mechanism is provided on the upper inner side of the outer barrel. The cleaning mechanism includes a second motor. A support plate is connected to the outer side of the second motor. Arc-shaped plates are provided at both ends of the lower part of the support plate. A support shaft is connected to the lower end of the second motor. Two vertically distributed first mounting holes are provided inside the support shaft. A first support rod and a second support rod are respectively inserted through the two first mounting holes. Multiple third insertion holes are arranged in a linear array inside the first and second support rods. A first connecting block and a second connecting block are respectively provided at one end of the first and second support rods. Multiple mounting plates are connected to the lower part of the first and second connecting blocks. Brush bristles are provided on one side of the mounting plates.

[0007] As a further feature of the above solution, the second motor is detachably connected to the support plate. The second motor is connected to the terminal device via an electrical signal, which facilitates the installation and maintenance of the second motor and makes it easier to control the operation of the second motor. A handle is connected to the top of the support plate for easy gripping by the user when placing the cleaning mechanism. Limiting grooves are provided at both ends of the support plate, and multiple first insertion holes are provided on both sides of the support plate in a linear array. One side of the arc-shaped plate is in contact with the outer wall of the outer tub, and a protrusion is provided on the top of the arc-shaped plate. The protrusion is slidably connected to the limiting groove, which facilitates the adjustment of the position of the arc-shaped plate according to the outer diameter of the outer tub.

[0008] As a further feature of the above solution, a limiting plate is provided above the protrusion. A second insertion hole is provided at both ends of the limiting plate, and a pin is provided at both ends of the limiting plate. The pin passes through the interior of both the first insertion hole and the second insertion hole and is detachably connected to the first insertion hole and the second insertion hole. This allows the arc plate to be fixed in a suitable position according to the diameter of the outer wall of the outer barrel, so that the second motor and the support plate remain stable during use.

[0009] As a further provision of the above solution, second mounting holes are provided on both sides of the first mounting hole. A first bolt is simultaneously installed through the interior of the second mounting hole and the third insertion hole. A second bolt is installed through the upper end of both the first connecting block and the second connecting block. The second bolt passes through the interior of the third insertion hole. A second nut and a first nut are threaded to the outer sides of the second bolt and the first bolt, respectively. This helps to adjust the third insertion hole aligned with the first mounting hole according to the inner wall diameter of the outer barrel of the centrifuge body to be cleaned and the diameter of the centrifuge filter barrel. This ensures that the bristles on the mounting plate side of the lower end of the first support rod and the second support rod can fit against the inner and outer walls of the centrifuge filter barrel and the inner wall of the outer barrel, thereby ensuring the quality of cleaning the centrifuge body.

[0010] As a further feature of the above solution, a first connecting shaft is connected to the lower center of the first connecting block, and two first connecting shafts are symmetrically connected to the lower part of the second connecting block. The upper and lower ends of the mounting plate are respectively provided with a fourth insertion hole and a second connecting shaft. The first connecting shaft passes through the interior of the fourth insertion hole, and the second connecting shafts at the ends of two adjacent mounting plates pass through the interior of the fourth insertion hole. A third nut is threaded to the outer side of both the second connecting shaft and the first connecting shaft. This allows an appropriate number of mounting plates to be connected sequentially according to the depth of the outer barrel and the centrifugal filter barrel, so that the connected bristles can match the depth of the outer barrel and the centrifugal filter barrel, improving cleaning efficiency and ensuring cleaning quality.

[0011] As a further feature of the above solution, a blocking block is provided at one end of the mounting plate, and a fourth insertion hole is provided inside the blocking block. Brush bristles are provided on the side of the blocking block near the brush bristles, which can prevent cleaning dead corners from appearing at the lower end after multiple mounting blocks are connected in sequence.

[0012] The centrifugal filter barrel of this invention has a filter bag (not shown) detachably connected inside, and multiple filter holes (not shown) are distributed on the side wall of the centrifugal filter barrel.

[0013] The present invention has the following beneficial effects during use:

[0014] The use of a support plate in the cleaning mechanism can confine the cleaning mechanism to the upper end of the outer tub, eliminating the need to install corresponding limit blocks on the inner wall of the outer tub. The combination of the first insertion hole, the arc plate, the second insertion hole, and the pin can adjust the position of the arc plate according to the outer diameter of the outer tub so that the arc plate fits tightly against the outer wall of the outer tub. Through the friction between the arc plate and the outer wall of the outer tub, the cleaning mechanism remains stable during use.

[0015] The combination of multiple third insertion holes inside the first and second support rods and the first bolts allows the third insertion holes to be aligned with the first mounting holes according to the inner wall diameter of the outer barrel of the centrifuge body to be cleaned and the diameter of the centrifuge filter barrel. The positions of the first and second support rods are fixed using the first bolts and the first nut, so that the bristles on the mounting plate side at the lower end of the first and second support rods can fit against the inner and outer walls of the centrifuge filter barrel and the inner wall of the outer barrel, ensuring cleaning quality while expanding the applicability of the cleaning mechanism.

[0016] The use of two first connecting shafts symmetrically connected at the lower end of the second connecting block allows users to adjust the orientation of the bristles according to actual usage needs. The use of multiple mounting blocks allows for the sequential connection of an appropriate number of mounting plates according to the depth of the outer barrel and centrifugal filter barrel, so that the connected bristles can match the depth of the outer barrel and centrifugal filter barrel, further improving the practicality of the cleaning mechanism and centrifuge. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a front sectional perspective view of the present invention;

[0020] Figure 3 This is a perspective view of the cleaning mechanism in this utility model;

[0021] Figure 4 This is a perspective view of the support plate and the second motor in this utility model;

[0022] Figure 5 This is a perspective view of the arc-shaped plate in this utility model;

[0023] Figure 6 This is a perspective view of the support shaft, the first support rod, and the second support rod in this utility model.

[0024] Figure 7 This is a perspective view of the first connecting block, mounting block, and plug in this utility model;

[0025] Figure 8 This is a perspective view of the second connecting block in this utility model.

[0026] In the diagram: 1. Centrifuge body; 2. Cleaning mechanism; 11. Outer drum; 12. Cover; 13. Centrifugal filter drum; 14. First motor; 15. Bracket; 21. Second motor; 22. Support plate; 221. Handle; 222. Limiting groove; 223. First insertion hole; 23. Arc plate; 231. Protrusion; 232. Limiting plate; 233. Second insertion hole; 234. Pin; 24. Support shaft; 241. First mounting hole; 24 2. Second mounting hole; 25. First support rod; 251. First bolt; 252. First nut; 253. First connecting block; 254. Second bolt; 255. Second nut; 256. First connecting shaft; 257. Third nut; 26. Second support rod; 261. Third insertion hole; 262. Second connecting block; 27. Mounting plate; 271. Fourth insertion hole; 272. Brush bristles; 273. Second connecting shaft; 28. Block. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-7 This application will be described in detail with reference to the embodiments.

[0029] An embodiment discloses a centrifuge for separating acetaminophen mother liquor, including a centrifuge body 1. The centrifuge body 1 includes an outer barrel 11 and a centrifugal filter barrel 13. The centrifugal filter barrel 13 is coaxially arranged inside the outer barrel 11. A cap 12 is detachably connected to the upper end of the outer barrel 11. A first motor 14 is connected through the middle of the bottom of the outer barrel 11. The output end of the first motor 14 is connected to the centrifugal filter barrel 13. A support 15 is connected to the lower part of the outer barrel 11 and is connected to the first motor 14. A cleaning mechanism 2 is provided on the upper inner side of the outer barrel 11. The cleaning mechanism 2 includes a second motor 21. A support plate 22 is connected to the outer side of the second motor 21. Both ends of the lower part are provided with arc-shaped plates 23. The lower end of the second motor 21 is connected to a support shaft 24. The support shaft 24 has two vertically distributed first mounting holes 241 inside. The two first mounting holes 241 are respectively provided with a first support rod 25 and a second support rod 26. The first support rod 25 and the second support rod 26 are each provided with a plurality of third insertion holes 261 arranged in a linear array inside. One end of the first support rod 25 and the second support rod 26 is respectively provided with a first connecting block 253 and a second connecting block 262. The lower part of the first connecting block 253 and the second connecting block 262 is connected with a plurality of mounting plates 27. One side of the mounting plate 27 is provided with bristles 272.

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the second motor 21 is detachably connected to the support plate 22. The second motor 21 is connected to the terminal device via an electrical signal, which facilitates the installation and maintenance of the second motor 21 and makes it easy to control the operation of the second motor 21. A handle 221 is connected to the top of the support plate 22 for easy gripping when the cleaning mechanism is installed. Limiting grooves 222 are provided at both ends of the support plate 22. Multiple first insertion holes 223 arranged in a linear array are provided on both sides of the support plate 22. One side of the arc plate 23 is in contact with the outer wall of the outer tub 11. A protrusion 231 is provided on the top of the arc plate 23. The protrusion 231 is slidably connected to the limiting groove 222, which facilitates the adjustment of the position of the arc plate 23 according to the outer wall diameter of the outer tub 11.

[0031] like Figure 3 , Figure 4 and Figure 5As shown, a limiting plate 232 is provided above the protrusion 231. Both ends of the limiting plate 232 are provided with second insertion holes 233 and pins 234. The pins 234 pass through the interior of the first insertion hole 223 and the second insertion hole 233 and are detachably connected to the first insertion hole 223 and the second insertion hole 233. This allows the arc plate 23 to be fixed in a suitable position according to the diameter of the outer wall of the outer barrel 11, so that the second motor 21 and the support plate 22 remain stable during use.

[0032] like Figure 3 , Figure 6 and Figure 7 As shown, second mounting holes 242 are provided on both sides of the first mounting hole 241. A first bolt 251 is simultaneously installed through the interior of the second mounting hole 242 and the third insertion hole 261. A second bolt 254 is installed through the upper end of the first connecting block 253 and the second connecting block 262. The second bolt 254 is installed through the interior of the third insertion hole 261. A second nut 255 and a first nut 252 are threaded to the outer sides of the second bolt 254 and the first bolt 251, respectively. This helps to adjust the third insertion hole 261, which is aligned with the first mounting hole 241, according to the inner wall diameter of the outer barrel 11 of the centrifuge body 1 to be cleaned and the diameter of the centrifuge filter barrel 13. This allows the bristles 272 on one side of the mounting plate 27 at the lower end of the first support rod 25 and the second support rod 26 to fit against the inner and outer walls of the centrifuge filter barrel 13 and the inner wall of the outer barrel 11, thereby ensuring the quality of cleaning the centrifuge body 1.

[0033] like Figure 3 , Figure 7 and Figure 8 As shown, a first connecting shaft 256 is connected to the lower middle part of the first connecting block 253, and two first connecting shafts 256 are symmetrically connected to the lower part of the second connecting block 262. The upper and lower ends of the mounting plate 27 are respectively provided with a fourth insertion hole 271 and a second connecting shaft 273. The first connecting shaft 256 passes through the interior of the fourth insertion hole 271, and the second connecting shaft 273 at the close end of two adjacent mounting plates 27 passes through the interior of the fourth insertion hole 271. The outer sides of the second connecting shaft 273 and the first connecting shaft 256 are threaded with a third nut 257. An appropriate number of mounting plates 27 can be connected sequentially according to the depth of the outer barrel 11 and the centrifugal filter barrel 13, so that the connected bristles 272 can match the depth of the outer barrel 11 and the centrifugal filter barrel 13, thereby improving cleaning efficiency and ensuring cleaning quality.

[0034] like Figure 3 and Figure 7As shown, a block 28 is provided at one end of the mounting plate 27. A fourth insertion hole 271 is provided inside the block 28. The bristles 272 are provided on the side of the block 28 near the bristles 272, which can prevent cleaning dead corners from appearing at the lower end after multiple mounting blocks are connected in sequence.

[0035] The centrifuge for separating acetaminophen mother liquor disclosed in this embodiment involves placing a sufficient amount of acetaminophen mother liquor into a removable filter bag in the centrifugal filter barrel 13 before use, covering it with the cap 12, turning on the switch of the first motor 14, causing the first motor 14 to drive the centrifugal filter barrel 13 and the filter bag to rotate, and the centrifuge body 1 to start running. Under the action of centrifugal force, the acetaminophen mother liquor is thrown out through the filter holes evenly distributed on the side wall of the centrifugal filter barrel 13 and discharged through the drain pipe below the outer barrel 11. The crystals are trapped in the filter bag. After centrifugation, the cap 12 is opened, the filter bag is removed from the inside of the filter barrel, and the crystals in the filter bag can be collected.

[0036] When cleaning the outer tub 11 and centrifugal filter tub 13 is required, open the cover 12, grasp the handle 221, place the cleaning mechanism 2 above the outer tub 11, so that the support plate 22 contacts the top surface of the outer tub 11. Adjust the third insertion hole 261 inside the first support rod 25 and the second support rod 26 to be aligned with the second mounting hole 242 according to the diameter of the outer tub 11 and the centrifugal filter tub 13. After passing the first bolt 251 through the second mounting hole 242, the third insertion hole 261 and the second mounting hole 242 in sequence, tighten the first nut 252 on the outside of the first bolt 251. Fix the first support rod 25 and the second support rod 26. Use the second bolt 254 and the second nut 255 to install the first connecting block 253 and the second connecting block 262 in sequence at the ends of the first support rod 25 and the second support rod 26 away from the support shaft 24, so that the second bolt 254 passes through the third insertion hole 261. At this time, after adding an appropriate number of mounting plates 27 below the first connecting block 253 and the second connecting block 262, the brush bristles 272 can clean the inner surfaces of the centrifugal filter bucket 13 and the outer bucket 11 during the rotation of the support shaft 24.

[0037] Remove the support plate 22, second motor 21, and first support rod 25 from the top of the outer barrel 11. Adjust the number of mounting plates 27 connected to the second connecting block 262 and the first connecting block 253 according to the depth of the outer barrel 11 and the centrifugal filter barrel 13, and connect them as follows: Taking the first connecting block 253 as an example, fit the fourth insertion hole 271 at the upper end of one mounting block onto the first connecting shaft 256, so that the bristles 272 face the inner wall of the centrifugal filter barrel 13 and contact the inner wall of the centrifugal filter barrel 13. Tighten the third nut 257 on the outside of the connecting shaft 256 to fix the mounting plate 27. Pass the second connecting shaft 273 at the lower end of the mounting plate 27 connected to the first connecting block 253 through the fourth insertion hole 271 at the upper end of the other mounting plate 27. Tighten the third nut 257 on the outside of the second connecting shaft 273 to connect the two mounting plates 27. Repeat the above connection operation to add the remaining mounting plates 27 until the bottom mounting plate 27 is installed. Install the plug 28 at the lower end of the bottom mounting plate 27.

[0038] Following the same method, install an appropriate number of mounting plates 27 on the second connecting block 262, so that the bristles 272 face the inner surface of the outer barrel 11. After assembly, place the cleaning mechanism 2 above the outer barrel 11 again, so that the bristles 272 at one end of the first support rod 25 and the second support rod 26 are respectively in contact with the inner surface of the centrifugal filter barrel 13 and the outer barrel 11. Adjust the position of the arc plate 23 so that the arc surface of the arc plate 23 is in contact with the outer wall of the outer barrel 11. Pass the pin 234 through the second insertion hole 233 and the first insertion hole 223 aligned with it to fix the position of the arc plate 23. Pour sufficient clean water into the centrifugal filter barrel 13 and use it. When the terminal equipment starts the second motor 21, it can drive the support shaft 24, the first support rod 25, the second support rod 26 and the mounting plate 27 to rotate, cleaning the inner walls of the centrifugal filter barrel 13 and the outer barrel 11. The wastewater after cleaning is discharged through the drain pipe under the outer barrel 11. After cleaning, adjust the orientation of the mounting plate 27 connected to the second connecting block 262 and the installation position of the second connecting block 262 so that the bristles 272 are in contact with the outer wall of the centrifugal filter barrel 13. Start the second motor 21 to drive the bristles 272 to rotate, which can clean the outer wall of the centrifugal filter barrel 13, ensuring the cleaning quality of the outer barrel 11 and the centrifugal filter barrel 13 in the centrifuge body 1.

[0039] The centrifuge body 1, outer barrel 11, centrifugal filter barrel 13, first motor 14, bracket 15, second motor 21, support plate 22, handle 221, arc plate 23, pin 234, first bolt 251, first nut 252, second bolt 254, second nut 255, third nut 257, and brush 272 disclosed in this utility model are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A centrifuge for separating acetaminophen mother liquor, comprising a centrifuge body, the centrifuge body including an outer barrel and a centrifugal filter barrel, the centrifugal filter barrel being coaxially disposed inside the outer barrel, a cap being detachably connected to the upper end of the outer barrel, a first motor being connected through the middle of the bottom of the outer barrel, the output end of the first motor being connected to the centrifugal filter barrel, and a support being connected to the lower part of the outer barrel, the support being connected to the first motor, characterized in that... A cleaning mechanism is provided on the upper inner side of the outer barrel. The cleaning mechanism includes a second motor, and a support plate is connected to the outer side of the second motor. Arc-shaped plates are provided at both ends of the lower part of the support plate. A support shaft is connected to the lower end of the second motor. Two vertically distributed first mounting holes are provided inside the support shaft. A first support rod and a second support rod are respectively inserted through the two first mounting holes. Multiple third insertion holes are provided in a linear array inside the first support rod and the second support rod. A first connecting block and a second connecting block are respectively provided at one end of the first support rod and the second support rod. Multiple mounting plates are connected to the lower part of the first connecting block and the second connecting block. Brush bristles are provided on one side of the mounting plate.

2. A centrifuge for separating acetaminophen mother liquor according to claim 1, characterized in that, The second motor is detachably connected to the support plate. The second motor is connected to the terminal device via an electrical signal. A handle is connected to the top of the support plate. Limiting grooves are provided at both ends of the support plate. Multiple first insertion holes are provided on both sides of the support plate in a linear array. One side of the arc-shaped plate is in contact with the outer wall of the outer barrel. A protrusion is provided on the top of the arc-shaped plate. The protrusion is slidably connected to the limiting groove.

3. A centrifuge for separating acetaminophen mother liquor according to claim 2, characterized in that, A limiting plate is provided above the protrusion. A second insertion hole is provided at both ends of the limiting plate. A pin is provided at both ends of the limiting plate. The pin passes through the interior of both the first insertion hole and the second insertion hole and is detachably connected to the first insertion hole and the second insertion hole.

4. A centrifuge for separating acetaminophen mother liquor according to claim 1, characterized in that, A second mounting hole is provided on both sides of the first mounting hole. A first bolt is simultaneously installed through the interior of the second mounting hole and the third insertion hole. A second bolt is installed through the upper end of both the first connecting block and the second connecting block. The second bolt passes through the interior of the third insertion hole. A second nut and a first nut are respectively threaded to the outer sides of the second bolt and the first bolt.

5. A centrifuge for separating acetaminophen mother liquor according to claim 1, characterized in that, The lower middle part of the first connecting block is connected to a first connecting shaft, and two first connecting shafts are symmetrically connected below the second connecting block. The upper and lower ends of the mounting plate are respectively provided with a fourth insertion hole and a second connecting shaft. The first connecting shaft passes through the interior of the fourth insertion hole, and the second connecting shafts at the ends of two adjacent mounting plates that are close to each other pass through the interior of the fourth insertion hole. The outer sides of the second connecting shaft and the first connecting shaft are threaded with a third nut.

6. A centrifuge for separating acetaminophen mother liquor according to claim 1, characterized in that, One end of the mounting plate is provided with a block, the inside of the block is provided with a fourth insertion hole, and the side of the block near the bristles is provided with bristles.

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