Hand-push type movable dustproof device for green building construction

Abstract

The invention discloses a hand-push type movable dustproof device for green building construction, and relates to the technical field of green building construction equipment. An existing dustproof device is inflexible to move, inconvenient to adjust dust falling angle and height and low in dust removal efficiency. The device comprises a moving structure, an adjusting structure, a dustproof structure and a water pump; the moving structure is provided with a bottom plate with moving wheels and a hand pushing frame, and overall movement is achieved. The adjusting structure comprises a horizontal steering mechanism, a height adjusting mechanism and a pitching angle adjusting mechanism, and is used for adjusting the space attitude of the dustproof structure in all directions; the dustproof structure is connected to the upper portion of the pitching angle adjusting mechanism and comprises a dust falling cover, a fan and an atomization spraying device. The water pump is arranged on the bottom plate, and a water outlet of the water pump is connected with the atomization spraying device through a water supply pipe. The device integrates the functions of movement, multi-dimensional adjustment and aerial fog cooperative dust removal, is convenient to move, can accurately control the spraying direction, height and angle, is high in dust removal efficiency, and is mainly used for raising dust treatment in green building construction.

Description

Technical Field

[0001] This invention relates to the field of green building construction equipment technology, and in particular to a hand-push mobile dust control device for green building construction. Background Technology

[0002] Dust pollution is a common environmental problem during green building construction. It not only damages the ecological environment of the construction area but also directly harms the respiratory system and eyes of construction workers. Long-term exposure may even lead to serious occupational diseases such as pneumoconiosis. In addition, the spread of construction dust to surrounding areas can also affect the normal lives of residents, which is inconsistent with the environmental protection, low-carbon, and health concepts advocated by green building construction and makes it difficult to meet the strict requirements of environmental protection departments for construction dust control.

[0003] Existing construction dust control devices are mainly divided into two categories: fixed and mobile. Fixed devices (such as spray towers and perimeter spray systems) are usually installed at the edge of the construction area, with fixed positions, and can only control dust in specific areas. They cannot flexibly follow the changing dust sources during construction, and their coverage is limited. At the same time, their spray angle and height are usually not adjustable, making it difficult to adapt to the dust control needs at different heights (such as building construction and foundation pit excavation).

[0004] While mobile dust suppression devices possess a degree of mobility, most have simple structures, often employing a handcart frame with a single spray head. This results in poor atomization, large water mist particles, small contact area with dust, and low dust removal efficiency. Furthermore, these devices often lack effective angle and height adjustment mechanisms, making it impossible to precisely adjust the spray range according to the direction and height of dust dispersion. This leads to limited coverage area per unit, often requiring multiple units to be used in conjunction, increasing construction costs. In addition, some devices suffer from low integration of power and water supply systems, cumbersome operation, and insufficient ease of movement and use in complex construction sites, impacting their actual dust suppression effectiveness.

[0005] Therefore, there is an urgent need to develop a mobile dust control device for green building construction that is flexible, has a precisely adjustable spray posture, and has high dust removal efficiency. Summary of the Invention

[0006] The technical problem to be solved and the technical task proposed by this invention is to improve and refine existing technical solutions, and to provide a hand-push mobile dust suppression device for green building construction, in order to solve the problems of inflexible movement, inconvenient adjustment of dust suppression angle and height, and low dust removal efficiency of existing dust suppression devices. To this end, this invention adopts the following technical solution.

[0007] A hand-push mobile dust control device for green building construction includes a moving structure, an adjusting structure, a dust control structure, and a water pump; The movable structure is used to drive the device to move in position, and includes a base plate and movable wheels located under the base plate. A pusher is provided at one end of the base plate. The adjustment structure is used to adjust the height and steering angle of the dustproof structure. The adjustment structure includes a horizontal steering mechanism, a height adjustment mechanism, and a pitch angle adjustment mechanism. The horizontal steering mechanism is located on the top of the base plate, the height adjustment mechanism is located on the top of the horizontal steering mechanism, the pitch angle adjustment mechanism is located on the top of the height adjustment mechanism, and the dustproof structure is connected to the top of the pitch angle adjustment mechanism. The dustproof structure includes a dust cover, a fan, and an atomizing spray device. The fan is located at one end inside the dust cover, and the atomizing spray device is located at the other end inside the dust cover. The water pump is mounted on the base plate. The water supply pipe of the atomizing spray device passes through the bottom of the dust suppression hood and is connected to the water outlet of the water pump. The water inlet of the water pump is used to connect to the water source through the water inlet pipe.

[0008] By integrating a movable chassis, a support adjustment mechanism that can be adjusted in multiple dimensions such as horizontal steering, height, and pitch angle, and a high-efficiency dust removal structure that combines forced airflow and annular water mist into a single design, the device is easy to move and can quickly reach different dust-generating points. The orientation, height, and tilt angle of the dust hood can be easily, quickly, and accurately adjusted, actively aligning with and covering dust sources or diffusion paths. The fan-driven airflow and water mist work together to significantly improve the contact efficiency and adsorption effect between the water mist and dust particles, achieving efficient, flexible, and precise construction dust control. This effectively solves the problems of poor flexibility, limited adjustment range, and low dust removal efficiency of existing mobile dust suppression devices.

[0009] As a preferred technical measure, the number of movable wheels is no less than four, and they are all distributed at the four corners under the base plate. This ensures the overall stability and balance of the device during both moving and static operation, enabling it to be used safely and reliably on uneven ground at the construction site.

[0010] As a preferred technical means, the horizontal steering mechanism includes a turntable, a conical gear ring, a motor, and a conical gear. The bottom end of the turntable is fixed to a base plate, the conical gear ring is fixed to the turntable, and the motor is fixed to the base plate. The motor's power output end is equipped with the conical gear, which meshes with the conical gear ring. This transmission method, where the motor drives the conical gear to mesh with the conical gear ring fixed to the turntable, achieves full-angle, stable, and controllable horizontal rotation adjustment of the dust hood. This allows the spray direction to precisely match the dust diffusion direction, significantly expanding the effective coverage area of ​​a single device.

[0011] As a preferred technical means: the height adjustment mechanism includes a first hydraulic device that is vertically fixed in the middle of the turntable, the piston rod of the first hydraulic device extends upward, and the pitch angle adjustment mechanism is connected to the upper end of the piston rod.

[0012] As a preferred technical means: the pitch angle adjustment mechanism includes a second hydraulic device and a fixed ring disposed on the first hydraulic device. The upper end of the piston rod of the first hydraulic device is rotatably connected to the fixed ring disposed on it. The fixed ring is sleeved and fixed on the dust cover. The second hydraulic device is located on the side of the upper end of the piston rod of the first hydraulic device, and the connection height between the second hydraulic device and the piston rod is lower than the rotatable connection height between the piston rod and the fixed ring. The lower end of the second hydraulic device is rotatably connected to the piston rod, and the upper end of the second hydraulic device is rotatably connected to the bottom of the dust cover on one side of the fixed ring. The first hydraulic device is parallel to the fixed ring, the first hydraulic device is parallel to the second hydraulic device, and the second hydraulic device is parallel to the three rotatable axes of the dust cover.

[0013] Vertical height adjustment is achieved through a first hydraulic device, while pitch angle adjustment is achieved through a parallelogram linkage mechanism consisting of a second hydraulic device, a fixed ring, and a piston rod, with the three rotation axes being parallel. This design ensures that the height and tilt angle adjustments of the dust hood are independent and do not interfere with each other, making operation simple, adjustment precise, and the structure robust, capable of adapting to dust control needs at different heights and angles.

[0014] As a preferred technical approach: the rotatable connection between the first hydraulic device and the fixed ring is hinged using a first hinge; the rotatable connections between the first hydraulic device and the second hydraulic device, and between the second hydraulic device and the dust cover, are all hinged using a second hinge; the hinge shaft diameter of the first hinge is larger than that of the second hinge. The use of a larger diameter hinge shaft in the first hinge enhances its load-bearing capacity and structural strength, improving the overall rigidity and reliability of the device in both adjustment and operating states; the second hinge fulfills the basic rotation function, achieving structural optimization and cost control.

[0015] As a preferred technical means: the atomizing spray device includes a water storage ring and multiple atomizing nozzles. The multiple atomizing nozzles are evenly distributed in a ring and connected to the inner side of the water storage ring. Multiple evenly distributed connecting rods are connected and fixed to the inner side of the dust suppression hood. The water storage ring is connected and fixed to the connecting rods. The lower end of the water storage ring is connected to the water supply pipe.

[0016] The water storage ring, in conjunction with multiple evenly distributed atomizing nozzles, forms a uniform water mist curtain surrounding the axis of the dust hood. This mist, combined with the fan airflow, creates columnar or conical water mist areas, significantly increasing the contact area and time between the water mist and the dust-laden air, thus improving dust removal efficiency. The arrangement of the connecting rods ensures the stable support of the water storage ring within the hood.

[0017] As a preferred technical means, the dust suppression hood is a cylindrical hood that runs through both ends, and the fan is an axial flow fan. By combining the cylindrical structure of the dust suppression hood with the axial flow fan, a strong axial airflow can be generated, which can more effectively blow water mist to a farther and wider area, significantly expanding the dust removal coverage and improving the overall dust removal efficiency.

[0018] As a preferred technical means, the dust suppression hood at one end of the atomizing spray device adopts a conical constriction structure. The conical constriction structure of the dust suppression hood at the spray end helps to converge and guide the atomized water mist, enhance the initial velocity and concentration of the water mist, and enable it to be more effectively directed towards the target area, while reducing the diffusion loss of water mist within the hood to a certain extent.

[0019] Beneficial effects: 1. By setting up a mobile structure with wheels and a pusher, the entire device becomes a flexible and mobile whole, which can be quickly moved to different dust points or dust diffusion paths on the construction site as needed. This fundamentally overcomes the limitation of fixed dust control devices with fixed coverage and realizes active dust control that moves with the dust.

[0020] 2. Through an integrated multi-dimensional adjustment structure encompassing horizontal steering, height adjustment, and pitch angle adjustment, the dust hood's spatial attitude is precisely controlled in all directions and with multiple degrees of freedom. This allows for independent and convenient adjustment of the spray direction, spray height, and spray angle, enabling precise targeting of dust sources at different locations and heights, or adjustment based on wind direction to intercept spreading dust, greatly enhancing the spatial adaptability and dust protection coverage of a single unit.

[0021] 3. The dustproof structure integrates the fan and atomizing spray device within the dust suppression hood, creating an active and efficient "air-mist" synergistic dust removal mechanism. The forced airflow generated by the fan not only actively draws in or pushes dust-laden air into the treatment area, but more importantly, it rapidly disperses and diffuses the fine water curtain generated by the atomizing nozzles, forming a larger and denser water mist field. This greatly increases the contact probability and contact area between the water mist and dust particles, thereby significantly improving the condensation and settling speed and effectiveness of dust. Compared to traditional passive spraying or single-point spraying, this active air-mist mixed dust removal is more efficient and can potentially achieve better dust suppression with less water, aligning with the water-saving concept of green construction.

[0022] 4. The mobile, adjustment, dust removal, and water supply modules are highly integrated into a single mobile chassis, resulting in a compact structure that eliminates the need for complex external piping connections or fixed installations. Operators can manually move the equipment and adjust its position, orientation, and height using the adjustment mechanism, simplifying the operation process, lowering the barrier to entry, and improving the response speed to sudden dust storms. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the dustproof structure of the present invention from the left side.

[0025] In the diagram: 1. Moving structure; 2. Adjustable structure; 3. Dustproof structure; 4. Water pump; 101. Base plate; 102. Moving wheels; 103. Hand-push frame; 201. First hydraulic device; 202. First hinge; 203. Second hydraulic device; 204. Turntable; 205. Conical gear ring; 206. Conical gear; 207. Motor; 208. Fixing ring; 209. Second hinge; 301. Dust cover; 302. Water supply pipe; 303. Water storage ring; 304. Atomizing nozzle; 305. Connecting rod; 306. Fan. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] In the description of this invention, it should be understood that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be set in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0028] like Figure 1 and Figure 2 As shown, the present invention provides a hand-push mobile dust control device for green building construction, which is an integrated device that combines mobility, multi-directional adjustment, and efficient dust removal functions. The device mainly includes a moving structure 1, an adjusting structure 2, a dust control structure 3, and a water pump 4.

[0029] The movable structure 1 forms the mobile base of the device. The movable structure 1 includes a rectangular base plate 101, with a caster wheel 102 installed at each of the four corners below the base plate 101. These caster wheels are typically omnidirectional to ensure the device can turn and move flexibly. A push frame 103 is fixedly installed at one end of the base plate 101 to facilitate pushing the device by the operator. Through the cooperation of the push frame 103 and the caster wheels 102, the operator can easily move the dustproof device to any dust-generating point on the construction site, achieving a high degree of mobility.

[0030] Adjustment structure 2 is mounted on the movable structure 1 and is used to adjust the spatial attitude of the dustproof structure 3 in all directions. Adjustment structure 2 integrates three functions: horizontal steering, height adjustment, and pitch angle adjustment. Its horizontal steering mechanism is directly mounted on the base plate 101. This horizontal steering mechanism specifically includes a turntable 204, a conical gear ring 205, a motor 207, and a conical gear 206. The bottom end of the turntable 204 is rotatably mounted on the left center area of ​​the upper surface of the base plate 101 via bearings and other components. The conical gear ring 205 is fixedly fitted onto the upper edge of the turntable 204. The motor 207 is fixedly mounted on the base plate 101 to the right of the turntable 204 via a bracket, and its power output shaft is horizontally to the left, with the conical gear 206 fixedly mounted at the shaft end. The conical gear 206 meshes with the conical gear ring 205 fixed on the turntable 204. When the motor 207 starts, it drives the bevel gear 206 to rotate. Through gear meshing, the bevel gear ring 205 and the entire turntable 204 rotate horizontally relative to the base plate 101, thereby achieving a 360-degree horizontal rotation of the dustproof structure 3.

[0031] A height adjustment mechanism is provided above the horizontal steering mechanism. This height adjustment mechanism includes a first hydraulic device 201 vertically fixed at the center of the upper surface of the turntable 204. The piston rod of the first hydraulic device 201 can extend upward or retract downward. By controlling the inflow and outflow of hydraulic oil in the first hydraulic device 201, the extension and retraction length of its piston rod can be precisely controlled, thereby realizing the overall lifting and lowering of the entire component mounted on it.

[0032] The pitch angle adjustment mechanism is connected to the upper end of the piston rod of the first hydraulic device 201. This mechanism mainly includes a second hydraulic device 203 and a fixing ring 208. The fixing ring 208 is rotatably connected to the top of the piston rod of the first hydraulic device 201 via a first hinge 202, specifically a hinge. The fixing ring 208 is fixedly sleeved on the outer periphery of the dust cover 301 of the dustproof structure 3 to connect and fix the dust cover 301. The second hydraulic device 203 is located to the side of the upper end of the piston rod of the first hydraulic device 201. The lower end of the second hydraulic device 203 is hinged to the side of the piston rod of the first hydraulic device 201 via a second hinge 209, and the height of this hinge point is lower than the height of the hinge point between the top of the piston rod and the fixing ring 208. The upper end of the second hydraulic device 203 is hinged to the bottom of the dust cover 301 via another second hinge 209. In this example, the hinge position is located in the bottom right region of the dust cover 301. Here, the first hinge 202 serves as the main load-bearing hinge point, and its hinge axis diameter is designed to be larger than that of the second hinge 209 to provide greater structural strength and load-bearing capacity. The hinge axes between the first hydraulic device 201 and the fixed ring 208, between the first hydraulic device 201 and the second hydraulic device 203, and between the second hydraulic device 203 and the dust cover 301 are parallel to each other, forming a parallel four-bar linkage. When the piston rod of the second hydraulic device 203 extends or retracts, it pushes or pulls the dust cover 301, causing it to rotate around the axis of the first hinge 202, thereby changing the pitch angle of the dust cover 301. The change in height is independently completed by the first hydraulic device 201; the two adjustments do not interfere with each other, ensuring precise operation and a stable structure.

[0033] The dustproof structure 3 is the core component for performing the dust removal function. It is mounted on the pitch angle adjustment mechanism via a fixing ring 208. The dustproof structure 3 includes a dust suppression hood 301, a fan 306, and a misting spray device. The dust suppression hood 301 is designed as a cylindrical hood with open ends. The fan 306, preferably an axial fan, is installed at its left end to generate a strong axial airflow. The misting spray device is installed on the right side inside the dust suppression hood 301. Figure 2 As shown, the atomizing spray device includes an annular water storage ring 303 and ten atomizing nozzles 304. The water storage ring 303 has a hollow interior, with a water supply pipe 302 connected to one side of its lower end. The ten atomizing nozzles 304 are evenly distributed in a ring along the inner circumference of the water storage ring 303. The water storage ring 303 is connected and fixed to the inner wall of the dust suppression hood 301 by four evenly distributed and radially arranged connecting rods 305, thus being stably supported inside the dust suppression hood 301. At the end of the dust suppression hood 301 where the atomizing spray device is installed, the outlet is designed as a converging conical structure, which helps to gather and accelerate the sprayed water mist.

[0034] Water pump 4 and the water supply system provide a water source for dust suppression. Water pump 4 is fixedly installed on the right side of the base plate 101. Its outlet is connected to a water supply pipe 302 that passes through the bottom of the dust suppression hood 301. The water inlet of water pump 4 is connected to an external water inlet pipe, which can be connected to a water source at the construction site, such as a water tank or water supply network.

[0035] The working principle and usage process of this invention are as follows: When dust is generated at a certain location on the construction site, the operator can hold the pusher 103 of the device and use the casters 102 to easily push the entire device to the vicinity of the target area. Then, the motor 207 is started, and through the meshing of the bevel gear 206 and the bevel gear ring 205, the turntable 204 and all components above it are driven to rotate horizontally, aligning the opening of the dust hood 301 with the dust source or the direction of its spread. Next, the piston rod of the first hydraulic device 201 is extended or retracted to adjust the dust hood 301 to a suitable height. If upward or downward tilting spraying is required, the piston rod of the second hydraulic device 203 is extended or retracted, driving the dust hood 301 to rotate around the axis of the first hinge 202 via a parallel four-bar linkage to adjust to the required pitch angle.

[0036] After the position and angle are adjusted, water pump 4 and fan 306 are started simultaneously. Water pump 4 pressurizes water and pumps it into water storage ring 303 through water supply pipe 302. The water is then sprayed out at high speed from multiple evenly distributed atomizing nozzles 304 in the form of fine droplets, forming a uniform water mist curtain inside the dust suppression hood 301. At the same time, axial fan 306 starts, generating a strong axial airflow. This airflow quickly passes through the cylindrical channel of dust suppression hood 301, fully dispersing and enveloping the water mist curtain sprayed from the atomizing nozzles 304, and forcefully blowing it forward. Under the guidance and acceleration of the conical constriction at the end of dust suppression hood 301, a dense water mist column with a long range and wide coverage is formed. This water mist column can effectively cover and penetrate the dusty area. The water mist particles collide, contact, and adsorb with the dust particles, eventually condensing and settling, thereby achieving the purpose of efficient dust suppression and removal.

[0037] The entire device is flexible to move, easy to adjust, and highly efficient at dust removal, perfectly meeting the stringent requirements of green building construction for dynamic dust control.

[0038] The above-described specific embodiments of the present invention demonstrate the outstanding substantive features and significant progress of the present invention. Based on the actual needs of use, equivalent modifications in shape, structure, etc., can be made to the present invention, and all such modifications are within the scope of protection of this solution.

Claims

1. A hand-push mobile dust control device for green building construction, characterized in that: It includes a moving structure (1), an adjusting structure (2), a dustproof structure (3), and a water pump (4); The movable structure (1) is used to drive the device to move in position, including a base plate (101) and a moving wheel (102) provided under the base plate (101). A pusher (103) is provided at one end of the base plate (101). The adjustment structure (2) is used to adjust the height and steering angle of the dustproof structure (3). The adjustment structure (2) includes a horizontal steering mechanism, a height adjustment mechanism and a pitch angle adjustment mechanism. The horizontal steering mechanism is located on the top of the base plate (101). The height adjustment mechanism is located on the top of the horizontal steering mechanism. The pitch angle adjustment mechanism is located on the top of the height adjustment mechanism. The dustproof structure (3) is connected to the top of the pitch angle adjustment mechanism. The dustproof structure (3) includes a dust cover (301), a fan (306) and an atomizing spray device. The fan (306) is located at one end inside the dust cover (301), and the atomizing spray device is located at the other end inside the dust cover (301). The water pump (4) is located on the base plate (101). The water supply pipe (302) of the atomizing spray device passes through the bottom of the dust cover (301) and is connected to the outlet of the water pump (4). The inlet of the water pump (4) is used to connect to the water source through the inlet pipe.

2. The hand-push mobile dust control device for green building construction according to claim 1, characterized in that: The number of the movable wheels (102) is no less than four, and they are all distributed at the four corners under the base plate (101).

3. A hand-push mobile dust control device for green building construction according to claim 1, characterized in that: The horizontal steering mechanism includes a turntable (204), a conical gear ring (205), a motor (207), and a conical gear (206). The bottom end of the turntable (204) is fixed on the base plate (101), the conical gear ring (205) is fixed on the turntable (204), and the motor (207) is fixed on the base plate (101). The power output end of the motor is provided with the conical gear (206), and the conical gear (206) meshes with the conical gear ring (205).

4. A hand-push mobile dust control device for green building construction according to claim 3, characterized in that: The height adjustment mechanism includes a first hydraulic device (201) that is vertically fixed in the middle of the turntable (204), the piston rod of the first hydraulic device (201) extends upward, and the pitch angle adjustment mechanism is connected to the upper end of the piston rod.

5. A hand-push mobile dust control device for green building construction according to claim 4, characterized in that: The pitch angle adjustment mechanism includes a second hydraulic device (203) and a fixing ring (208) disposed on the first hydraulic device (201). The upper end of the piston rod of the first hydraulic device (201) is rotatably connected to the fixing ring (208) disposed on it. The fixing ring (208) is sleeved and fixed on the dust cover (301). The second hydraulic device (203) is located on the side of the upper end of the piston rod of the first hydraulic device (201), and the connection height with the piston rod is lower than the rotatable connection height between the piston rod and the fixed ring (208). The lower end of the second hydraulic device (203) is rotatably connected to the piston rod, and the upper end of the second hydraulic device (203) is rotatably connected to the bottom of the dust cover (301) on one side of the fixed ring (208). The first hydraulic device (201) is parallel to the fixed ring (208), the first hydraulic device (201) is parallel to the second hydraulic device (203), and the second hydraulic device (203) is parallel to the dust cover (301).

6. A hand-push mobile dust control device for green building construction according to claim 5, characterized in that: The rotatable connection between the first hydraulic device (201) and the fixed ring (208) is hinged by the first hinge (202); The rotatable connection between the first hydraulic device (201) and the second hydraulic device (203) and the second hydraulic device (203) and the dust cover (301) is made by the second hinge (209); The hinge diameter of the first hinge (202) is greater than the hinge diameter of the second hinge (209).

7. A hand-push mobile dust control device for green building construction according to claim 6, characterized in that: The atomizing spray device includes a water storage ring (303) and multiple atomizing nozzles (304). The multiple atomizing nozzles (304) are evenly distributed in a ring and connected to the inner side of the water storage ring (303). Multiple evenly distributed connecting rods (305) are fixedly connected to the inner side of the dust cover (301). The water storage ring (303) is fixedly connected to the connecting rods (305). The lower end of the water storage ring (303) is connected to the water supply pipe (302).

8. A hand-push mobile dust control device for green building construction according to claim 7, characterized in that: The dust cover (301) is a cylindrical cover with both ends open, and the fan (306) is an axial flow fan.

9. A hand-push mobile dust control device for green building construction according to claim 8, characterized in that: The dust cover (301) located at one end of the atomizing spray device adopts a conical constriction structure.

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