Multifunctional powder modification production device

Abstract

The invention provides a multifunctional powder modification production device, and belongs to the technical field of powder modification, the multifunctional powder modification production device comprises a reaction tube; the material pushing assembly comprises a rotating rod, an auger, a pushing groove, a piston, a connecting groove, a threaded groove, a fixed rod, a rotating rod and a limiting block, the rotating rod is rotationally connected into the reaction pipe, the auger is fixedly connected to the circumferential surface of the rotating rod, the pushing groove is formed in the circumferential surface of the rotating rod, and modified powder is collected by the continuous pushing-out device. And the production efficiency of powder modification is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of powder modification, and in particular relates to a multifunctional powder modification production device. Background Art

[0002] Powder modification refers to treating the surface properties of powder materials by physical or chemical methods to improve their dispersibility, wettability, rheology and other properties to meet specific application requirements. This technology is widely used in plastics, rubber, coatings, ceramics, medicine, cosmetics and other industries.

[0003] After searching, it was found that a powder modification machine was disclosed in a Chinese patent with the authorization announcement number "CN104289125B", which belongs to the field of mechanical equipment technology. It is characterized in that it includes an activation body, a feed port is set at the top of the activation body, and a discharge port is set at the bottom. A first rotating shaft and a second rotating shaft are arranged in the activation body, a group of working blades A are arranged on the first rotating shaft, and a group of working blades B are arranged on the second rotating shaft. The shell of the activation body is composed of an inner layer, an outer layer and a hollow heating layer between the inner and outer layers. A group of electric heating pipes are arranged in the hollow heating layer and filled with heat transfer oil to form a heating body. The above-mentioned powder modification machine adopts the method of external heating and internal activation for activation processing. It has a compact structure, reliable performance, convenient operation, high activation efficiency, stable product quality, energy saving and environmental protection.

[0004] The above invention uses external heating and internal activation to perform activation processing. It has a compact structure, reliable performance, easy operation, high activation efficiency, stable product quality, energy saving and environmental protection. However, in order to fully complete the powder modification in the powder modification work, only a part of the powder can be put into the device for reaction at a time, and assembly line production cannot be carried out, which affects the efficiency of powder modification. Summary of the invention

[0005] The purpose of the present invention is to provide a multifunctional powder modification production device, aiming to solve the problem in the prior art that only a portion of powder can be put into the device for reaction at a time, and assembly line production cannot be carried out, which affects the efficiency of powder modification.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multifunctional powder modification production device, comprising:

[0008] Reaction tube;

[0009] A pushing assembly, the pushing assembly includes a rotating rod, an auger, a pushing groove, a piston, a connecting groove, a threaded groove, a fixed rod, a rotating rod and a limit block, the rotating rod is rotatably connected to the reaction tube, the auger is fixedly connected to the circumferential surface of the rotating rod, the pushing groove is opened on the circumferential surface of the rotating rod, the piston is slidably connected to the circumferential surface of the rotating rod and the reaction tube, the circumferential inner wall opened on the piston, the threaded groove is opened on the circumferential surface of the pushing groove, the fixed rod is fixedly connected to the circumferential inner wall of the connecting groove, the rotating rod is rotatably connected to the lower end of the fixed rod through a rotating shaft, the rotating rod slides in the threaded groove, and the limit block is fixedly connected to one side end of the fixed rod.

[0010] As a preferred solution of the present invention, a feed inlet is provided at the upper end of the reaction tube, and the piston slides at the lower opening of the feed inlet.

[0011] As a preferred solution of the present invention, one end of the reaction tube is fixedly connected to a rotating sleeve, the rotating rod rotates in the rotating sleeve, a gas pipe is provided on one side of the rotating sleeve, and one end of the gas pipe is fixedly connected to a heating nozzle.

[0012] As a preferred solution of the present invention, a flap is fixedly connected to one side end of the auger, and the flap is in contact with the circumferential inner wall of the reaction tube.

[0013] As a preferred solution of the present invention, a heating hole is opened at one side end of the rotating rod, a temperature conducting hole is opened in the auger, the heating hole is connected with the temperature conducting hole, and the front end of the heating nozzle is arranged in the heating hole.

[0014] As a preferred solution of the present invention, the lower end of the reaction tube is fixedly connected with a fixed sleeve, a cylinder is fixedly connected inside the fixed sleeve, one side end of the cylinder is fixedly connected with a push block, and the push block is fixed to one side end of the piston.

[0015] As a preferred solution of the present invention, the lower end of the reaction tube is fixedly connected with an adjusting block, and a vent is provided in the adjusting block.

[0016] As a preferred solution of the present invention, an air inlet is provided on one side end of the adjustment block, a spring groove is provided on one inner wall of the air inlet, a return spring is fixedly connected to one inner wall of the spring groove, a blocking block is fixedly connected to the other side end of the return spring, and the blocking block matches the air inlet.

[0017] As a preferred solution of the present invention, the outer surface of the reaction tube is covered with a thermal insulation sleeve, and one side end of the thermal insulation sleeve is provided with a fixing flange.

[0018] As a preferred solution of the present invention, the helix angle of the thread groove is three hundred and sixty degrees.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Through this device, the powder to be reacted is continuously put into the device for reaction. The pushing component pushes the material intermittently to provide sufficient reaction time for the powder. When pushing the material, all the powders are stirred so that they can fully contact with the auger and be heated to increase the reaction rate of the powder. The modified powder is continuously pushed out of the device for collection to improve the production efficiency of powder modification.

[0021] 2. Through this device, the pusher assembly provides oxygen for the modification reaction of the powder in the reaction tube and increases the reaction rate of the powder through high gas pressure.

[0022] 3. Through this device, the rotating rod and the auger in contact with the powder inside the reaction tube are heated to increase the contact area between the high temperature fixation and the powder, and further improve the reaction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a structural stereogram of the present invention;

[0025] Figure 2 It is a cross-sectional view of the structure in the present invention;

[0026] Figure 3 It is a cross-sectional exploded view of the first structure in the present invention;

[0027] Figure 4 It is a cross-sectional exploded view of the second structure in the present invention;

[0028] Figure 5 It is a cross-sectional exploded view of the third structure in the present invention;

[0029] Figure 6 For the present invention Figure 3 The enlarged view of point A in the middle;

[0030] Figure 7 For the present invention Figure 3 The enlarged view of point B in the middle;

[0031] Figure 8 For the present invention Figure 4 Enlarged view of point C in the middle;

[0032] Fig. 9 For the present invention Figure 4 Enlarged view of point D in the middle.

[0033] In the figure: 1. reaction tube; 2. rotating rod; 3. auger; 4. pushing groove; 5. piston; 6. connecting groove; 7. threaded groove; 8. fixing rod; 9. rotating rod; 10. limiting block; 11. feeding port; 12. rotating sleeve; 13. gas pipe; 14. heating nozzle; 15. flap; 16. heating hole; 17. temperature conduction hole; 18. fixing sleeve; 19. cylinder; 20. pushing block; 21. adjusting block; 22. air vent; 23. spring groove; 24. air inlet; 25. reset spring; 26. blocking block; 27. thermal insulation sleeve. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-Figure 9 , the present invention provides the following technical solutions:

[0037] A multifunctional powder modification production device, comprising:

[0038] Reaction tube 1;

[0039] The pusher assembly includes a rotating rod 2, an auger 3, a pushing groove 4, a piston 5, a connecting groove 6, a threaded groove 7, a fixed rod 8, a rotating rod 9 and a limit block 10. The rotating rod 2 is rotatably connected to the reaction tube 1, the auger 3 is fixedly connected to the circumferential surface of the rotating rod 2, the pushing groove 4 is opened on the circumferential surface of the rotating rod 2, the piston 5 is slidably connected to the circumferential surface of the rotating rod 2 and the reaction tube 1, is opened on the circumferential inner wall of the piston 5, the threaded groove 7 is opened on the circumferential surface of the pushing groove 4, the fixed rod 8 is fixedly connected to the circumferential inner wall of the connecting groove 6, the rotating rod 9 is rotatably connected to the lower end of the fixed rod 8 through a rotating shaft, the rotating rod 9 slides in the threaded groove 7, and the limit block 10 is fixedly connected to one side end of the fixed rod 8.

[0040] In a specific embodiment of the present invention, the reaction tube 1 is used for the powder modification reaction. The powder and the reactant are placed in the reaction tube 1, and then the powder modification reaction is completed by heating. The rotating rod 2 rotates in the reaction tube 1 and heats the auger 3. After the powder enters the reaction tube 1, the powder is pushed to move to the front end by the rotation of the rotating rod 2. When the auger 3 pushes the powder forward, the heated auger 3 accelerates the reaction speed of the powder and the reactant by high temperature when it contacts the powder. The piston 5 matches the inner wall of the reaction tube 1. When the piston 5 is active, The piston 5 moves repeatedly on one side of the reaction tube 1. When the piston 5 moves forward, it is inserted into the reaction tube 1 and blocks one side of the reaction tube 1. When it moves backward, the piston 5 is pulled out of the reaction tube 1. When the piston 5 moves, it is always sleeved on the outer periphery of the push groove 4. The fixed rod 8 is fixed to the fixed rod 8. The rotating rod 9 rotates at the lower end of the fixed rod 8 through the rotating shaft. However, since the limit block 10 is provided at the lower end of the fixed rod 8 to limit the reverse rotation of the rotating rod 9, the rotating rod 9 can only rotate to the side without the limit block 10. When the piston 5 moves forward, the piston 5 is always sleeved on the outer periphery of the push groove 4. The fixed rod 8 is fixed to the fixed rod 8. The rotating rod 9 rotates at the lower end of the fixed rod 8 through the rotating shaft. However, since the limit block 10 is provided at the lower end of the fixed rod 8 to limit the reverse rotation of the rotating rod 9, the rotating rod 9 can only rotate to the side without the limit block 10. When the piston 5 moves forward, the rotating rod 9 is pushed forward, and the limit block 10 clamps one side end of the rotating rod 9 so that the rotating rod 9 and the fixed rod 8 cannot bend when the piston 5 moves forward. The rotating rod 9 squeezes the spiral inner wall of the thread groove 7 in the thread groove 7 and rotates the rotating rod 2 until the rotating rod 9 slides to the front end of the thread groove 7. At this time, the powder in the reaction tube 1 is pushed forward and stirred when the rotating rod 2 and the auger 3 rotate, so that all the powder can fully contact with the auger 3 and be heated. When the piston 5 moves backward, the rotating rod 9 contacts the spiral inner wall of the thread groove 7 and rotates. The inner wall of the groove 7 moves backward and rotates and returns to its original position to be re-engaged in the rear end of the thread groove 7. At this time, the rotating rod 2 does not rotate, providing a certain heating time for the powder that was previously turned over and stirred, and when the piston 5 retreats and pulls out of the reaction tube 1 and pushes it into the reaction tube 1 again, the air outside the reaction tube 1 is pushed into the reaction tube 1 to provide oxygen for the modification reaction of the powder, and as the piston 5 moves, the air pressure in the reaction tube 1 increases, and the high air pressure in the reaction tube 1 pushes the powder that has completed the reaction at the front end out of the front end of the reaction tube 1 to collect the powder.

[0041] For details, please refer to Figure 1-Figure 9 A feed inlet 11 is provided at the upper end of the reaction tube 1 , and the piston 5 slides at the lower opening of the feed inlet 11 .

[0042] In this embodiment: the feed port 11 is arranged at the upper end of the reaction tube 1, and the powder and the reactant are poured into the reaction tube 1 through the feed port 11. When the piston 5 moves forward, the lower opening of the feed port 11 is blocked. At this time, a certain amount of powder is blocked by the piston 5. When the piston 5 moves backward, the powder falls into the reaction tube 1 and the feed port 11 is blocked by the next movement to increase the air pressure in the reaction tube 1 and push the powder out from the front end of the reaction tube 1. Through intermittent pushing, turning and feeding, the powder in the reaction tube 1 has sufficient reaction time to improve the powder modification efficiency.

[0043] For details, please refer to Figure 1-Figure 9 A rotating sleeve 12 is fixedly connected to one end of the reaction tube 1, and the rotating rod 2 rotates in the rotating sleeve 12. A gas pipe 13 is provided on one side of the rotating sleeve 12, and a heating nozzle 14 is fixedly connected to one end of the gas pipe 13.

[0044] In this embodiment: the rotating sleeve 12 is fixed at the front end of the reaction tube 1 to provide support for the rotating rod 2, the rotating rod 2 rotates in the rotating sleeve 12, the gas pipe 13 is fixed to the external fuel pipe to provide fuel for the heating nozzle 14, the heating nozzle 14 penetrates into the rotating rod 2 to heat the inner wall of the rotating rod 2 and the auger 3, and when the powder contacts the high-temperature rotating rod 2 and the auger 3, the reaction efficiency is improved.

[0045] For details, please refer to Figure 1-Figure 9 A flap 15 is fixedly connected to one side end of the auger 3 , and the flap 15 contacts the circumferential inner wall of the reaction tube 1 .

[0046] In this embodiment, the flap 15 and the auger 3 are both spiral-shaped. When the flap 15 rotates along with the gas pipe 13, the powder at the bottom of the reaction tube 1 is turned over and stirred, so that the powder in the reaction tube 1 can fully contact with the rotating rod 2 and the auger 3 to react when being transported forward.

[0047] For details, please refer to Figure 1-Figure 9 A heating hole 16 is provided at one side end of the rotating rod 2 , a temperature conducting hole 17 is provided in the auger 3 , the heating holes 16 are connected to the temperature conducting holes 17 , and the front end of the heating nozzle 14 is arranged in the heating hole 16 .

[0048] In this embodiment: the rotating rod 2 and the temperature conducting hole 17 are both hollow, and the heating nozzle 14 is arranged in the heating hole 16 to heat the inner walls of the heating hole 16 and the temperature conducting hole 17 through flame, thereby heating the rotating rod 2 and the auger 3 to increase the contact area between the high temperature area and the powder.

[0049] For details, please refer to Figure 1-Figure 9 The lower end of the reaction tube 1 is fixedly connected with a fixed sleeve 18, and a cylinder 19 is fixedly connected inside the fixed sleeve 18. A push block 20 is fixedly connected to one side end of the cylinder 19, and the push block 20 is fixed to one side end of the piston 5.

[0050] In this embodiment: the fixed sleeve 18 is used to support the cylinder 19, and one side of the push block 20 is fixed to one side end of the piston 5, and the other side is fixed to the extended end of the cylinder 19. The piston 5 is driven to reciprocate through the cylinder 19, which drives the auger 3 to rotate and inputs oxygen into the reaction tube 1 to accelerate the reaction speed.

[0051] For details, please refer to Figure 1-Figure 9 The lower end of the reaction tube 1 is fixedly connected with an adjusting block 21 , and a vent 22 is provided in the adjusting block 21 .

[0052] In this embodiment: the vent 22 is an air intake channel in the reaction tube 1. When the piston 5 moves backward, the pressure in the reaction tube 1 decreases. At this time, air is taken in through the vent 22 to prevent the powder in the reaction tube 1 from being sucked to the rear of the reaction tube 1 by the low air pressure when the piston 5 moves backward.

[0053] For details, please refer to Figure 1-Figure 9 An air inlet 24 is provided at one side end of the adjusting block 21, a spring groove 23 is provided on the inner wall of one side of the air inlet 24, a return spring 25 is fixedly connected to the inner wall of one side of the spring groove 23, and a blocking block 26 is fixedly connected to the other side end of the return spring 25, and the blocking block 26 matches the air inlet 24.

[0054] In this embodiment: when the piston 5 moves forward and causes the air pressure in the reaction tube 1 to increase, the high air pressure generates a thrust on the rear side of the blocking block 26, and cooperates with the resilience of the return spring 25 to make the blocking block 26 block the air inlet 24. At this time, the air in the reaction tube 1 will not leak out from the air inlet 24; when the piston 5 moves backward and causes the air pressure in the reaction tube 1 to decrease, the low air pressure generates a backward suction force on the blocking block 26, and the suction force squeezes the return spring 25 to contract, causing the blocking block 26 to slide backward. At this time, the air inlet 24 is opened to allow air to enter the reaction tube 1 to maintain the pressure in the reaction tube 1 and prevent the powder pushed forward from being sucked back.

[0055] For details, please refer to Figure 1-Figure 9 The outer surface of the reaction tube 1 is covered with a thermal insulation sleeve 27 , and one side end of the thermal insulation sleeve 27 is provided with a fixing flange.

[0056] In this embodiment, the insulation sleeve 27 is sleeved on the outer surface of the reaction tube 1 and has the same length as the heating end of the rotating rod 2 . It is used for thermal insulation of the device and the device is fixed by the flange of the insulation sleeve 27 .

[0057] For details, please refer to Figure 1-Figure 9 , the helix angle of the thread groove 7 is three hundred and sixty degrees.

[0058] In this embodiment: the spiral angle of the thread groove 7 is 360 degrees, so that the front and rear ends of the thread groove 7 are on the same straight line. When the rotating rod 9 is pulled from the front end to the rear end, the rotating rod 9 squeezed and rotated by the thread groove 7 will fall back into the rear end of the thread groove 7.

[0059] It should be noted that the heating nozzle 14 and the cylinder 19 used in the present device are both prior art and will not be described in detail here.

[0060] The working principle and use process of the present invention are as follows: the reaction tube 1 is used for the powder modification reaction. The powder and the reactant are placed in the reaction tube 1, and then the powder modification reaction is completed by heating. The rotating rod 2 rotates in the reaction tube 1 and heats the auger 3. After the powder enters the reaction tube 1, the powder is pushed to move to the front end by the rotation of the rotating rod 2. When the auger 3 pushes the powder forward, the heated auger 3 accelerates the reaction speed of the powder and the reactant through high temperature when in contact with the powder. The piston 5 matches the inner wall of the reaction tube 1. The piston 5 is movable. When the piston 5 moves forward, it is inserted into the reaction tube 1 and blocks one side of the reaction tube 1. When it moves backward, the piston 5 is pulled out of the reaction tube 1. When the piston 5 moves, it is always sleeved on the outer periphery of the push groove 4. The fixed rod 8 is fixed to the fixed rod 8. The rotating rod 9 rotates at the lower end of the fixed rod 8 through the rotating shaft. However, since the limit block 10 is provided at the lower end of the fixed rod 8 to limit the reverse rotation of the rotating rod 9, the rotating rod 9 can only rotate to the side without the limit block 10. When the piston 5 moves forward, the piston 5 is inserted into the reaction tube 1 and blocks one side of the reaction tube 1. When it moves backward, the piston 5 is pulled out of the reaction tube 1. When the piston 5 moves, it is always sleeved on the outer periphery of the push groove 4. The fixed rod 8 is fixed to the fixed rod 8. The rotating rod 9 rotates at the lower end of the fixed rod 8 through the rotating shaft. However, since the limit block 10 is provided at the lower end of the fixed rod 8 to limit the reverse rotation of the rotating rod 9, the rotating rod 9 can only rotate to the side without the limit block 10. When moving, the rotating rod 9 is pushed forward, and the limit block 10 clamps one side end of the rotating rod 9 so that the rotating rod 9 and the fixed rod 8 cannot bend when the piston 5 moves forward. The rotating rod 9 squeezes the spiral inner wall of the thread groove 7 in the thread groove 7 and rotates the rotating rod 2 until the rotating rod 9 slides to the front end of the thread groove 7. At this time, the powder in the reaction tube 1 is pushed forward and stirred when the rotating rod 2 and the auger 3 rotate, so that all the powder can fully contact with the auger 3 and be heated. When the piston 5 moves backward, the rotating rod 9 contacts The inner wall of the thread groove 7 moves backward and rotates and returns to its original position to be re-engaged in the rear end of the thread groove 7. At this time, the rotating rod 2 does not rotate, providing a certain heating time for the powder that was previously turned over and stirred, and when the piston 5 retreats and pulls out of the reaction tube 1 and pushes it into the reaction tube 1 again, the air outside the reaction tube 1 is pushed into the reaction tube 1 to provide oxygen for the modification reaction of the powder, and as the piston 5 moves, the air pressure in the reaction tube 1 increases, and the high air pressure in the reaction tube 1 pushes the powder that has completed the reaction at the front end out of the front end of the reaction tube 1 to collect the powder.

[0061] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multifunctional powder modification production device, characterized in that: include: Reaction tube (1); A pusher assembly, the pusher assembly comprising a rotating rod (2), an auger (3), a pushing groove (4), a piston (5), a connecting groove (6), a threaded groove (7), a fixed rod (8), a rotating rod (9) and a stop block (10), the rotating rod (2) being rotatably connected to the inside of a reaction tube (1), the auger (3) being fixedly connected to the circumferential surface of the rotating rod (2), the pushing groove (4) being arranged on the circumferential surface of the rotating rod (2), the piston (5) being slidably connected to the circumferential surface of the rotating rod (2) and the inside of the reaction tube (1), the threaded groove (7) being arranged on the circumferential inner wall of the piston (5), the fixed rod (8) being fixedly connected to the circumferential inner wall of the connecting groove (6), the rotating rod (9) being rotatably connected to the lower end of the fixed rod (8) via a rotating shaft, the rotating rod (9) sliding in the threaded groove (7), and the stop block (10) being fixedly connected to one side end of the fixed rod (8).

2. A multifunctional powder modification production device according to claim 1, characterized in that: The upper end of the reaction tube (1) is provided with a feed inlet (11), and the piston (5) slides at the lower opening of the feed inlet (11).

3. A multifunctional powder modification production device according to claim 2, characterized in that: A rotating sleeve (12) is fixedly connected to one end of the reaction tube (1), and the rotating rod (2) rotates in the rotating sleeve (12). A gas pipe (13) is provided on one side of the rotating sleeve (12), and a heating nozzle (14) is fixedly connected to one end of the gas pipe (13).

4. A multifunctional powder modification production device according to claim 3, characterized in that: A flap (15) is fixedly connected to one side end of the auger (3), and the flap (15) is in contact with the circumferential inner wall of the reaction tube (1).

5. A multifunctional powder modification production device according to claim 4, characterized in that: A heating hole (16) is provided at one side end of the rotating rod (2), a temperature conducting hole (17) is provided in the auger (3), the heating hole (16) is communicated with the temperature conducting hole (17), and the front end of the heating nozzle (14) is arranged in the heating hole (16).

6. A multifunctional powder modification production device according to claim 5, characterized in that: The lower end of the reaction tube (1) is fixedly connected to a fixed sleeve (18), a cylinder (19) is fixedly connected inside the fixed sleeve (18), a push block (20) is fixedly connected to one side end of the cylinder (19), and the push block (20) is fixed to one side end of the piston (5).

7. A multifunctional powder modification production device according to claim 6, characterized in that: The lower end of the reaction tube (1) is fixedly connected to an adjustment block (21), and a vent (22) is provided in the adjustment block (21).

8. The multifunctional powder modification production device according to claim 7, characterized in that: An air inlet (24) is provided at one end of the regulating block (21), a spring groove (23) is provided on one inner wall of the air inlet (24), a return spring (25) is fixedly connected to one inner wall of the spring groove (23), a blocking block (26) is fixedly connected to the other end of the return spring (25), and the blocking block (26) matches the air inlet (24).

9. The multifunctional powder modification production device according to claim 8, characterized in that: The outer surface of the reaction tube (1) is covered with a thermal insulation sleeve (27), and a fixing flange is provided at one end of the thermal insulation sleeve (27).

10. A multifunctional powder modification production device according to claim 9, characterized in that: The helical angle of the thread groove (7) is three hundred and sixty degrees.

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