A multi-point unloading machine

Abstract

The application discloses a multi-point bin discharging machine and relates to the technical field of bulk material bin discharging. The application comprises a discharging pipe, which is fixedly installed at the outlet of a bin; an outer cylinder is welded to the outer side of the discharging pipe; a bottom plate is fixedly installed at the bottom of the outer cylinder; a material pushing assembly is rotatably installed at the top of the bottom plate; a plurality of discharging ports are arranged at the bottom of the bottom plate; the material pushing assembly is used for pushing bulk materials to the discharging ports uniformly and orderly; a driving device is fixedly installed at the bottom of the bottom plate; and the driving device is used for driving the material pushing assembly to rotate. The multi-point bin discharging machine can be safely and effectively sealed, no dust leakage occurs on the spot during the bin discharging process, and the bin discharging problem of special bulk materials, such as toxic materials, materials with irritating odor and materials with high temperature, can be solved; the working environment of the equipment is safe and environmentally friendly; the problem that materials flow fast in the middle of a hopper and flow slowly at the periphery is completely avoided; and the effect that materials in the bin fall as a whole is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the bulk material unloading technology field, and particularly relates to a multi-point silo unloading machine. BACKGROUND

[0002] At present, in the field of bulk material conveying and processing, various diameters, shapes and structures of silos have been widely applied. In the power, metallurgy, mining, chemical, grain, cement, environmental protection, medicine and other related industries, the silo is used as a storage for various bulk materials conveyed from the upstream process, and the silo is used for unloading to the next level of equipment according to the production process requirements, so as to meet the continuity and stability of the production process.

[0003] Most of the existing silo bottom ends are conical hopper structures. When the bulk material flows downward and is outward conveyed under the action of gravity, in most cases, the flow rate of the middle part of the material is fast, and the flow rate of the peripheral part of the material is slow. After a period of time, a large amount of material hanging and accumulation phenomenon occurs on the side wall of the hopper, which causes the effective flow passage outlet cross-sectional area of the hopper to become smaller and smaller, resulting in that the unloading capacity of the bulk material in the silo cannot meet the production requirements, and even various blockage phenomena often occur, thereby seriously affecting the normal operation of the overall production system. In the Chinese patent (application number: CN202210264129.8), a vibrating silo bottom unloader is disclosed. The unloader is provided with a paddle structure outside the activator. When the material appears a structure phenomenon in the unloading hopper during use of the device, the arching material in the unloading hopper is scattered under the action of the paddle swing, and then cooperates with the vibration reduction motor, so that the arch breaking effect of the device is more obvious, and the material passing is more smooth. The device uses the paddle swing and vibration to dredge the material. This method is easy to cause large smoke dust of the bulk material, and has poor dredging effect for special bulk materials such as toxic, irritating odor and high temperature. At the same time, the scattered raw materials still need to be discharged through the conical hopper, and the situation that the flow rate of the middle part of the material is fast and the flow rate of the peripheral part of the material is slow still occurs. SUMMARY

[0004] The purpose of the present application is to solve the above problems, and the present application provides a multi-point silo unloading machine.

[0005] In order to achieve the above purpose, the present application specifically adopts the following technical scheme:

[0006] A multi-point silo unloading machine, comprising a discharge pipe, the discharge pipe is fixedly installed at the outlet of the silo, an outer cylinder is welded on the outer side of the discharge pipe, and a bottom plate is fixedly installed at the bottom of the outer cylinder.

[0007] A material feeding assembly is rotatably mounted on the top of the base plate, and multiple sets of discharge ports are provided on the bottom of the base plate. The material feeding assembly is used to push the bulk material evenly and orderly to the discharge ports. A driving device is fixedly mounted on the bottom of the base plate, and the driving device is used to drive the material feeding assembly to rotate.

[0008] Furthermore, an adjusting sleeve is fitted onto the outer side of the discharge pipe, and an adjusting screw is fixedly installed on the outer side of the adjusting sleeve. The adjusting sleeve is located inside the outer cylinder, and the adjusting screw is threaded onto the outer cylinder.

[0009] Furthermore, the feeding assembly includes a first feeding ring, which is rotatably mounted on the top of the base plate. The first feeding ring is coaxial with the outer cylinder and closely adheres to the inner wall of the outer cylinder. The inner wall of the first feeding ring is provided with multiple sets of fixed feeding rods in a ring shape, and the inner wall of the first feeding ring is provided with multiple sets of feeding tooth plates in a ring shape. The output end of the driving device is connected to the first feeding ring.

[0010] Furthermore, the feeding assembly includes a second feeding ring and a central feeding shaft. The inner wall of the second feeding ring is also circumferentially provided with multiple sets of feeding tooth plates. Multiple sets of elastic levers are provided between the second feeding ring and the central feeding shaft. A driving wheel and a driven wheel are rotatably installed at the bottom of the base plate. The driving wheel and the driven wheel are driven by friction. The driven wheel is fixedly connected to the central feeding shaft. The driving wheel is connected to the output end of the drive device. The outer cylinder has a transmission window. A drive wheel is rotatably installed inside the transmission window. The drive wheel is driven by a motor. The drive wheel and the second feeding ring are driven by friction.

[0011] Furthermore, friction grooves are provided on the outer sides of the driving wheel, driven wheel, second feeding ring, and drive wheel.

[0012] Furthermore, a sliding brake rod is slidably connected to the bottom of the base plate, and a brake head is provided on the side of the sliding brake rod near the driven wheel. A swing brake rod is hinged to the top of the outer cylinder, and an arc-shaped brake head is provided at the top of the swing brake rod. A brake window is provided on the outer side of the outer cylinder, and the arc-shaped brake head can swing in the brake window. The arc-shaped brake head can be tangent to the outer surface of the second feeding ring, and the center of the tangent circle coincides with the swing center of the swing brake rod. The contact area between the brake head and the driven wheel is greater than the contact area between the arc-shaped brake head and the second feeding ring. A hinge groove is provided at the end of the sliding brake rod away from the driven wheel, and a hinge guide groove is provided inside the hinge groove. A hinge post is provided at the bottom of the swing brake rod, and the hinge post is inserted into the hinge guide groove.

[0013] Furthermore, a transmission box is fixedly installed at the bottom of the base plate. Both the driving wheel and the driven wheel are located in the transmission box, and the sliding brake lever is slidably connected in the transmission box. An adjusting motor is fixedly installed inside the transmission box, and a worm gear is fixedly installed at the output end of the adjusting motor. A worm wheel is rotatably installed inside the transmission box, and the worm wheel meshes with the worm. A crank wheel is fixedly installed on the outside of the worm wheel, and a crank rod is hinged to the outside of the crank wheel. The other end of the crank rod is hinged to the sliding brake lever.

[0014] Furthermore, the inner wall of the outer cylinder is provided with a sealing protrusion ring, which is located directly above the second feeding ring, and the top of the sealing protrusion ring is designed to slope downwards.

[0015] Furthermore, a gate is provided at the bottom of the discharge port.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The multi-point discharge machine of this invention has a unique unloading principle, which completely avoids the problem of fast flow in the middle of the hopper and slow flow in the periphery, and achieves the effect of the material falling as a whole in the hopper.

[0018] 2. The multi-point discharge machine of this invention has strong adaptability to materials. The type, moisture content, particle size, temperature, viscosity and density of the bulk materials in the hopper no longer affect the stability of discharge. The equipment discharges materials evenly, ensuring the stability of the overall production system.

[0019] 3. The multi-point unloading machine of this invention can achieve safe and effective sealing. During the unloading process, there is no dust leakage on site. It can solve the problem of storage and unloading of special bulk materials with toxic, irritating odors, high temperature and other special characteristics. The working environment of the equipment is safe and environmentally friendly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first structure of the multi-point warehouse exit machine of the present invention;

[0021] Figure 2 This is a cross-sectional schematic diagram of the first structure of the multi-point discharge machine of the present invention;

[0022] Figure 3 This is an exploded view of the first structure of the multi-point discharge machine of the present invention;

[0023] Figure 4 This is the present invention. Figure 3 Cross-sectional view;

[0024] Figure 5 This is a schematic diagram of the first structure of the feeding assembly of the present invention;

[0025] Figure 6 This is a schematic diagram of the second structure of the multi-point warehouse exit machine of the present invention;

[0026] Figure 7 This is a cross-sectional schematic diagram of the second structure of the multi-point discharge machine of the present invention;

[0027] Figure 8 This is an exploded view of the first structure of the multi-point discharge machine of the present invention;

[0028] Figure 9 This is a schematic diagram of the internal structure of the transmission box of the present invention;

[0029] Figure 10 This is the present invention. Figure 9 Enlarged diagram of part A in the middle;

[0030] Figure 11 This is a schematic diagram of the second structure of the feeding assembly of the present invention.

[0031] Reference numerals: 1. Hopper; 2. Discharge pipe; 3. Adjusting sleeve; 31. Adjusting screw; 4. Outer cylinder; 41. Sealing ring; 5. Base plate; 6. Drive unit; 61. Transmission box; 62. Drive wheel; 63. Driven wheel; 64. Adjusting motor; 65. Worm gear; 66. Worm wheel; 67. Crank wheel; 68. Crank rod; 69. Sliding brake rod; 610. Hinge guide groove; 7. Feeding assembly; 71. First feeding ring; 72. Fixed feeding rod; 73. Feeding tooth plate; 74. Second feeding ring; 75. Central material shaft; 76. Elastic feeding rod; 8. Discharge port; 9. Drive wheel; 10. Swing brake rod; 101. Arc-shaped brake head. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0033] Example 1, as Figures 1-5 As shown, a multi-point discharge machine includes a discharge pipe 2, which is fixedly installed at the outlet of the hopper 1. An outer cylinder 4 is welded to the outside of the discharge pipe 2, and a bottom plate 5 is fixedly installed at the bottom of the outer cylinder 4.

[0034] A material feeding assembly 7 is rotatably installed on the top of the base plate 5, and multiple sets of discharge ports 8 are provided at the bottom of the base plate 5. The material feeding assembly 7 is used to push the bulk materials evenly and orderly to the discharge ports 8. A drive device 6 is fixedly installed at the bottom of the base plate 5, and the drive device 6 is used to drive the material feeding assembly 7 to rotate.

[0035] Furthermore, a slide gate is provided at the bottom of the discharge port 8, and an electric or pneumatic slide gate can be installed according to specific working conditions.

[0036] During installation, the discharge pipe 2 is installed at the bottom of the silo 1 using a flange. The device is easy to install. The drive device 6 drives the feeding assembly 7 to rotate. The feeding assembly 7 pushes the bulk material evenly and orderly to the discharge port 8, and then discharges it evenly through the discharge port 8. It can achieve safe and effective sealing. During the unloading process, there is no dust leakage on site. It can solve the problem of storing and unloading special bulk materials with toxic, irritating odors, high temperature and other special conditions. The working environment of the equipment is safe and environmentally friendly.

[0037] Example 2, based on the above examples, further includes an adjusting sleeve 3 sleeved on the outside of the discharge pipe 2, an adjusting screw 31 fixedly installed on the outside of the adjusting sleeve 3, the adjusting sleeve 3 being located in the outer cylinder 4, and the adjusting screw 31 being threadedly connected to the outer cylinder 4.

[0038] By rotating the adjusting screw 31, the adjusting screw 31 drives the adjusting sleeve 3 to rise and fall, thereby changing the distance between the adjusting sleeve 3 and the feeding assembly 7, adjusting the material height in the feeding assembly 7, and in conjunction with adjusting the speed of the drive device 6, the feeding amount can be controlled.

[0039] Example 3: Based on the above examples, a set of feeding assembly 7 structures is provided;

[0040] like Figure 5 As shown, the feeding assembly 7 includes a first feeding ring 71, which is rotatably mounted on the top of the base plate 5. The first feeding ring 71 is coaxial with the outer cylinder 4 and closely adheres to the inner wall of the outer cylinder 4. Multiple sets of fixed feeding rods 72 are arranged in a ring inside the first feeding ring 71, and multiple sets of feeding tooth plates 73 are arranged in a ring on the inner wall of the first feeding ring 71. The output end of the drive device 6 is connected to the first feeding ring 71.

[0041] The material falls into the first feeding ring 71 through the discharge pipe 2 and the adjusting sleeve 3. The driving device 6 drives the first feeding ring 71 to rotate. The first feeding ring 71 drives the fixed feeding rod 72 to rotate. The fixed feeding rod 72 gradually moves the bulk material located in the center to the periphery of the first feeding ring 71. Then the feeding tooth plate 73 evenly and orderly discharges the bulk material on the periphery to the discharge port 8.

[0042] This embodiment is mainly used for materials with low viscosity. The bending angle of the fixed feeding rod 72 can also be determined according to the particle size of the material, which is suitable for situations where the bulk material is determined.

[0043] Example 4: Based on the above examples, another set of feeding assembly 7 structures is provided;

[0044] like Figures 6-11As shown, the feeding assembly 7 includes a second feeding ring 74 and a central feeding shaft 75. The inner wall of the second feeding ring 74 is also provided with multiple sets of feeding tooth plates 73 in a ring. Multiple sets of elastic levers 76 are provided between the second feeding ring 74 and the central feeding shaft 75. The bottom of the base plate 5 is rotatably mounted with a driving wheel 62 and a driven wheel 63. The driving wheel 62 and the driven wheel 63 are driven by friction. The driven wheel 63 is fixedly connected to the central feeding shaft 75. The driving wheel 62 is connected to the output end of the drive device 6. The outer cylinder 4 has a transmission window. The drive wheel 9 is rotatably mounted inside the transmission window. The drive wheel 9 is driven by a motor. The drive wheel 9 and the second feeding ring 74 are driven by friction.

[0045] Simultaneously, drive wheel 9 and drive wheel 62 are activated. Drive wheel 9 drives the second feeding ring 74 to rotate, drive wheel 62 drives the driven wheel 63 to rotate, and driven wheel 63 drives the central material shaft 75 to rotate. By controlling the speed of drive wheel 9 and drive wheel 62, the second feeding ring 74 and the central material shaft 75 are made to rotate synchronously, and the direction of rotation is opposite to the bending direction of elastic lever 76. This ensures that when feeding, the material will give the elastic lever 76 a bending force in the same direction, ensuring the structural stability of elastic lever 76.

[0046] With the settings of this embodiment, the rotation of the central material shaft 75 relative to the second material feeding ring 74 can be controlled according to the particle size of the material without customization. When a certain length of elastic lever 76 is wound on the central material shaft 75, the elastic lever 76 is straightened, which is suitable for large particles and the feeding is more stable. When the central material shaft 75 releases the elastic lever 76, the elastic lever 76 bends at a certain angle under its own elastic force, which is suitable for small particles and can improve the conveying efficiency.

[0047] In general, unloading devices have a large number of feeding rods with a large surface area. When the material viscosity is high, the material tends to stick to them. However, through the design of this invention, while unloading, the second feeding ring 74 and the central material shaft 75 are controlled to rotate repeatedly at different speeds, causing the elastic feeding rod 76 to bend repeatedly. This can bounce the material off its surface and disperse the viscous material, resulting in a better unloading effect. It can discharge viscous material for a long time, and no manual cleaning is required after unloading, making it more convenient to use.

[0048] Example 5, based on the above examples, also includes friction grooves on the outer sides of the driving wheel 62, the driven wheel 63, the second feeding ring 74, and the drive wheel 9. This design can improve transmission stability.

[0049] Example 6, based on the above examples, further includes a sliding brake rod 69 slidably connected to the bottom of the base plate 5, a brake head provided on the side of the sliding brake rod 69 near the driven wheel 63, a swing brake rod 10 hinged to the top of the outer cylinder 4, an arc-shaped brake head 101 provided at the top of the swing brake rod 10, a brake window provided on the outer side of the outer cylinder 4, the arc-shaped brake head 101 can swing in the brake window, the arc-shaped brake head 101 can be tangent to the outer surface of the second feeding ring 74, and the center of the tangent circle coincides with the swing center of the swing brake rod 10, the contact area between the brake head and the driven wheel 63 is greater than the contact area between the arc-shaped brake head 101 and the second feeding ring 74, a hinge groove is provided at the end of the sliding brake rod 69 away from the driven wheel 63, a hinge guide groove 610 is provided inside the hinge groove, and a hinge post is provided at the bottom end of the swing brake rod 10, the hinge post being inserted into the hinge guide groove 610.

[0050] Simultaneously, drive wheel 9 and drive wheel 62 are activated. Drive wheel 9 drives the second feeding ring 74 to rotate, drive wheel 62 drives the driven wheel 63 to rotate, and driven wheel 63 drives the central material shaft 75 to rotate. By controlling the speed of drive wheel 9 and drive wheel 62, the second feeding ring 74 and the central material shaft 75 rotate synchronously. Then, the sliding brake lever 69 is controlled to slide towards the driven wheel 63. When the sliding brake lever 69 drives the brake head to press on the driven wheel 63, the driven wheel 63 stops rotating, and the sliding brake lever 69 drives the swing brake lever 10 to swing. The swing brake lever 10 drives the arc-shaped brake head 101 away from the second feeding ring 74. At this time, the second feeding ring 74 and the central material shaft 75 rotate at different speeds. The central material shaft 75 winds up the elastic lever 76. The contact time is short, but the contact area is large, resulting in a large braking force and a strong elastic lever. The lever 76 is quickly straightened, and then the sliding brake lever 69 is controlled to move away from the driven wheel 63. The sliding brake lever 69 drives the swing brake lever 10 to swing. The swing brake lever 10 drives the arc-shaped brake head 101 to approach the second material feeding ring 74. Since the arc-shaped brake head 101 can be tangent to the outer surface of the second material feeding ring 74, the contact area is small and the braking force is small. However, since the center of tangency coincides with the swing center of the swing brake lever 10, there will also be contact during the swing back. The contact time is relatively long, and the elastic lever 76 bends slowly. Therefore, by setting it in this way, while ensuring that the speed of the drive wheel 9 and the drive device 6 remains unchanged, it can achieve the effect of controlling the differential rotation of the second material feeding ring 74 and the central material shaft 75. Moreover, the quick straightening and slow bending can better disperse the material and shake off the material on the elastic lever 76, resulting in a better control effect.

[0051] Example 7, based on the above examples, further includes a transmission box 61 fixedly installed at the bottom of the base plate 5. The driving wheel 62 and the driven wheel 63 are both located in the transmission box 61, and the sliding brake lever 69 is slidably connected in the transmission box 61. An adjusting motor 64 is fixedly installed inside the transmission box 61. A worm gear 65 is fixedly installed at the output end of the adjusting motor 64. A worm wheel 66 is rotatably installed inside the transmission box 61. The worm wheel 66 meshes with the worm gear 65. A crank wheel 67 is fixedly installed on the outside of the worm wheel 66. A crank rod 68 is hinged to the outside of the crank wheel 67. The other end of the crank rod 68 is hinged to the sliding brake lever 69.

[0052] By energizing the regulating motor 64, the regulating motor 64 drives the worm gear 65 to rotate, the worm gear 65 drives the worm wheel 66 to rotate, the worm wheel 66 drives the crank wheel 67 to rotate, the crank wheel 67 drives the crank rod 68 to swing, and the crank rod 68 drives the sliding brake lever 69 to slide back and forth. When it is necessary to adjust the bending angle of the elastic lever 76, it is only necessary to control the rotation angle of the regulating motor 64. Under the action of unidirectional transmission of the worm gear and worm wheel, the position of the sliding brake lever 69 will not change arbitrarily, and the adjustment is more stable.

[0053] Example 8, based on the above examples, further includes a sealing protrusion ring 41 provided on the inner wall of the outer cylinder 4. The sealing protrusion ring 41 is located directly above the second feeding ring 74, and the top of the sealing protrusion ring 41 is designed to slope downward. This design can improve the sealing between the second feeding ring 74 and the outer cylinder 4, and prevent material from leaking from the brake window and the transmission window.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-point discharge machine, comprising a discharge pipe (2), characterized in that, The discharge pipe (2) is fixedly installed at the outlet of the silo (1), and an outer cylinder (4) is welded to the outside of the discharge pipe (2). A bottom plate (5) is fixedly installed at the bottom of the outer cylinder (4). The bottom plate (5) is rotatably mounted with a material feeding assembly (7), and the bottom of the bottom plate (5) is provided with multiple sets of discharge ports (8). The material feeding assembly (7) is used to push the bulk material evenly and orderly to the discharge port (8). The bottom of the bottom plate (5) is fixedly mounted with a driving device (6), which is used to drive the material feeding assembly (7) to rotate. An adjusting sleeve (3) is fitted on the outside of the discharge pipe (2). An adjusting screw (31) is fixedly installed on the outside of the adjusting sleeve (3). The adjusting sleeve (3) is located in the outer cylinder (4). The adjusting screw (31) is threadedly connected to the outer cylinder (4). The feeding assembly (7) includes a second feeding ring (74) and a central feeding shaft (75). The inner wall of the second feeding ring (74) is also circumferentially provided with multiple sets of feeding tooth plates (73). Multiple sets of elastic levers (76) are provided between the second feeding ring (74) and the central feeding shaft (75). The bottom of the base plate (5) is rotatably mounted with a driving wheel (62) and a driven wheel (63). The driving wheel (62) and the driven wheel (63) are driven by friction. The driven wheel (63) is fixed to the central feeding shaft (75). The drive wheel (62) is connected to the output end of the drive device (6). The outer cylinder (4) has a transmission window. The drive wheel (9) is rotatably installed inside the transmission window. The drive wheel (9) is driven by a motor. The drive wheel (9) and the second feeding ring (74) are transmitted through friction. A certain length of elastic lever (76) can be wound on the central material shaft (75). The second feeding ring (74) and the central material shaft (75) can rotate at different speeds repeatedly, so that the elastic lever (76) is repeatedly stretched and bent.

2. The multi-point warehouse exit machine according to claim 1, characterized in that, Friction grooves are provided on the outer sides of the driving wheel (62), driven wheel (63), second feeding ring (74) and drive wheel (9).

3. A multi-point warehouse exit machine according to claim 2, characterized in that, A sliding brake rod (69) is slidably connected to the bottom of the base plate (5). A brake head is provided on the side of the sliding brake rod (69) near the driven wheel (63). A swing brake rod (10) is hinged to the top of the outer cylinder (4). An arc-shaped brake head (101) is provided at the top of the swing brake rod (10). A brake window is provided on the outer side of the outer cylinder (4). The arc-shaped brake head (101) can swing in the brake window. The arc-shaped brake head (101) can interact with the second feeding ring ( 74) The outer surfaces are tangent, and the center of the tangent circle coincides with the swing center of the swing brake rod (10). The contact area between the brake head and the driven wheel (63) is greater than the contact area between the arc brake head (101) and the second feed ring (74). The end of the sliding brake rod (69) away from the driven wheel (63) is provided with a hinge groove. The inside of the hinge groove is provided with a hinge guide groove (610). The bottom end of the swing brake rod (10) is provided with a hinge post, which is inserted into the hinge guide groove (610).

4. A multi-point warehouse exit machine according to claim 3, characterized in that, A transmission box (61) is fixedly installed at the bottom of the base plate (5). The driving wheel (62) and the driven wheel (63) are both located in the transmission box (61), and the sliding brake rod (69) is slidably connected in the transmission box (61). An adjusting motor (64) is fixedly installed inside the transmission box (61). A worm gear (65) is fixedly installed at the output end of the adjusting motor (64). A worm wheel (66) is rotatably installed inside the transmission box (61). The worm wheel (66) meshes with the worm gear (65). A crank wheel (67) is fixedly installed on the outside of the worm wheel (66). A crank rod (68) is hinged to the outside of the crank wheel (67). The other end of the crank rod (68) is hinged to the sliding brake rod (69).

5. A multi-point warehouse exit machine according to claim 4, characterized in that, The inner wall of the outer cylinder (4) is provided with a sealing protrusion ring (41), which is located directly above the second feeding ring (74), and the top of the sealing protrusion ring (41) is designed to be angled downward.

6. A multi-point warehouse exit machine according to any one of claims 1-4, characterized in that, The bottom of the discharge port (8) is provided with a door plate.

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