Rapid mouse hole drilling device

Abstract

This application provides a rapid rat hole drilling device, including a rotating body, a telescopic rod, and a soil compactor. A drill bit assembly is located at the lower end of the rotating body, and a helical impeller is arranged on the circumference of the rotating body. The telescopic rod is arranged parallel to the axis of the rotating body, and its upper end is fixedly connected to the upper end of the rotating body via a connecting arm. The soil compactor is connected to the lower end of the telescopic rod and has a first motor and a swing rod driven by the first motor. The moving surface formed by the swing rod relative to the first motor includes at least a first conical surface, and the small end of the first conical surface is arranged radially away from the rotating body. The rapid rat hole drilling device provided by this application can effectively improve work efficiency and reduce the waste of human resources.

Description

Technical Field

[0001] This application relates to the field of drilling engineering technology, and in particular to a device for rapidly drilling rat holes. Background Technology

[0002] Rat holes are auxiliary structures in drilling engineering, and can be divided into large rat holes and small rat holes. Large rat holes are openings on the drilling platform used to place angular drill pipes (with swivels) during tripping, while small rat holes are openings in front of the rotary table used to place and connect single drill pipes. Before lowering the rat hole casing, drilling is required. During this process, soil accumulates around the holes. To minimize the impact of this soil accumulation on drilling operations, current practice involves manually clearing the soil around the rat holes periodically. However, to avoid personnel injury, drilling operations must be suspended, resulting in a waste of human resources and reduced work efficiency. Summary of the Invention

[0003] In view of this, this application provides a device for quickly drilling mouse holes, which can effectively improve work efficiency and reduce the waste of human resources.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A device for quickly drilling into mouse holes, comprising:

[0006] A rotating body, wherein a drill bit assembly is provided at the lower end of the rotating body, and a helical impeller is provided on the circumferential surface of the rotating body;

[0007] A telescopic rod is arranged parallel to the axis of the rotating body, and the upper end of the telescopic rod is fixedly connected to the upper end of the rotating body through a connecting arm;

[0008] A soil compactor, connected to the lower end of the telescopic rod, has a first motor and a swing rod driven by the first motor. The moving surface formed by the swing rod relative to the first motor includes at least a first conical surface, and the small end of the first conical surface is arranged radially away from the rotating body.

[0009] Optionally, in the above-described rapid mouse hole drilling device, the moving surface further includes a second conical surface that is perpendicular to the first conical surface.

[0010] Optionally, in the above-mentioned rapid rat hole drilling device, the soil compactor includes a hinged seat fixedly connected to the telescopic rod, and the middle part of the swing rod is ball-jointed to the hinged seat.

[0011] Optionally, in the above-mentioned rapid rat hole drilling device, the soil compactor includes a mounting frame fixedly connected to the telescopic rod, the first motor is fixed to the mounting frame, and the first motor is connected to the end of the swing rod away from the rotating body via a crank handle.

[0012] Optionally, in the above-mentioned rapid mouse hole drilling device, the drill assembly includes a second motor and a plurality of rotating blades arranged around the axis of the rotating body. The second motor is used to drive the rotating blades to move relative to the rotating body, so that the rotating blades have at least a first posture and a second state.

[0013] In the first posture, all the rotating blades are assembled together to form a disk that is perpendicular to the axis of the rotating body;

[0014] In the second posture, all the rotating blades together constitute a turbine body for cutting soil.

[0015] Optionally, in the above-mentioned rapid rat hole drilling device, the outer diameter of the disc and the outer diameter of the turbine body are both equal to the outer diameter of the helical impeller.

[0016] Optionally, in the above-mentioned rapid mouse hole drilling device, the drill assembly includes a rotating shaft coaxially arranged with the rotating body. The rotating shaft is rotatably connected to the rotating body and driven by the second motor. A plurality of cylindrical rods corresponding one-to-one with the rotating blades are hinged to the circumferential surface of the rotating shaft. The cylindrical rods pass through the connecting holes of the rotating blades. The surface of the cylindrical rods is provided with a spiral groove. The inner wall of the connecting hole is provided with a slider that cooperates with the spiral groove.

[0017] The drill bit assembly also includes a sliding body that is slidably connected to both the rotating body and the cylindrical rod. The sliding body is rotatably connected to the rotating blade. The rotating body is provided with a guide groove that cooperates with the sliding body. The projection of the guide groove along the axial direction of the rotating body is arc-shaped, and the position on the guide groove that is farther away from the axis of the rotating body is farther away from the upper end of the rotating body.

[0018] Optionally, in the above-described rapid rat hole drilling device, the drill assembly includes a cone that is fixedly connected to the lower end of the rotating shaft.

[0019] Optionally, in the above-mentioned rapid rat hole drilling device, the cross-section of the guide groove is T-shaped.

[0020] Optionally, in the above-mentioned rapid mouse hole drilling device, the sliding body has a connecting ring sleeved on the cylindrical rod.

[0021] According to the above technical solution, this application provides a device for quickly drilling mouse holes, including a rotating body, a telescopic rod, and a soil compactor. The drill bit assembly is located at the lower end of the rotating body, and a spiral impeller is provided on the circumference of the rotating body. The telescopic rod is arranged parallel to the axis of the rotating body, and the soil compactor is connected to the lower end of the telescopic rod. The upper end of the telescopic rod is fixedly connected to the upper end of the rotating body through a connecting arm. Therefore, during operation, the soil compactor moves together with the rotating body, that is, the movement trajectory of the soil compactor is a circle around the mouse hole. The soil compactor has a first motor and a swing rod driven by the first motor. The moving surface formed by the swing rod relative to the first motor includes at least a first conical surface. The small end of the first conical surface is set in a direction away from the rotating body along the radial direction of the rotating body. For example, while the soil compactor moves with the rotating body, the swing rod rotates around a certain radial line of the rotating body. The moving surface formed in this way includes the first conical surface. The small end of this first conical surface is farther away from the mouse hole than the large end. In this way, without stopping the machine, the swing rod "adjusts" the side of the soil pile close to the mouse hole in real time, so that the side forms a slope bounded by the lower contour line of the first conical surface. This prevents the soil in the soil pile from falling into the mouse hole, saving the trouble of manually cleaning the soil pile at regular intervals. It can be seen that the rapid mouse hole drilling device provided by this application can effectively improve work efficiency and reduce the waste of human resources. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 A schematic diagram of the rapid rat hole drilling device provided in the embodiments of this application;

[0024] Figure 2 for Figure 1 An enlarged view of point A in the diagram;

[0025] Figure 3 for Figure 1 A schematic diagram of the rotating body with a helical impeller 1;

[0026] Figure 4 for Figure 3 Enlarged diagram of point B in the diagram;

[0027] Figure 5 for Figure 3 A sectional view of the components;

[0028] Figure 6 for Figure 5 An enlarged diagram of point C in the diagram.

[0029] The diagram is marked as follows:

[0030] 1. Spiral impeller; 2. Connecting shaft; 3. Connecting arm; 4. Rotating blade; 5. Telescopic rod; 6. Mounting frame; 7. First motor; 71. Handle; 8. Swing rod; 81. Sphere; 9. Hinge seat; 91. Spherical cavity; 10. Drill bit; 11. Connecting ring; 12. T-block; 13. Guide groove; 14. Cylindrical rod; 15. Spiral groove; 16. Second motor. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] like Figures 1-6 As shown in the figure, this application provides a device for quickly drilling mouse holes, including a rotating body, a telescopic rod 5, and a soil compactor. The rotating body is the main part of this device and is responsible for drilling holes. Before operation, the rotating body needs to be connected to an external power source, such as a drive motor, to enable it to rotate. It should be noted that the specific structure of the power source and the connection structure between the power source and the rotating body are prior art and are not shown in the accompanying drawings. In this embodiment, a connecting shaft 2 is provided at the upper end of the rotating body, and the torque of the power source is transmitted to the connecting shaft 2, thereby driving the rotating body to rotate.

[0033] A drill bit assembly is installed at the lower end of the rotating body, and a helical impeller 1 is installed on the circumference of the rotating body. The drill bit assembly is responsible for drilling (or cutting soil) when the rotating body rotates, and the helical impeller 1 is responsible for soil transport, that is, carrying the soil out of the mouse hole. The telescopic rod 5 is set parallel to the axis of the rotating body, and the upper end of the telescopic rod 5 is fixedly connected to the upper end of the rotating body through a connecting arm 3. When the rotating body rotates, it will take the telescopic rod 5 to rotate around the axis of the rotating body, thereby realizing the rotation of the telescopic rod 5 around the mouse hole. The soil compactor is connected to the lower end of the telescopic rod 5. It can rotate around the mouse hole with the telescopic rod 5, and can also move in a direction parallel to the axis of the rotating body when the telescopic rod 5 extends or retracts, thereby realizing the change of the position and height of the soil compactor. The soil compactor has a first motor 7 and a swing rod 8 driven by the first motor 7. The moving surface formed by the swing rod 8 relative to the first motor 7 includes at least a first conical surface. The small end of the first conical surface is arranged radially away from the rotating body. For example, while the soil compactor moves with the rotating body, the swing rod 8 rotates around a certain radial line of the rotating body. The moving surface formed in this way includes the first conical surface. The small end of this first conical surface is farther away from the mouse hole than the large end. In this way, without stopping the machine, the swing rod 8 "trimmed" (or cleaned) the side of the soil pile near the mouse hole in real time, so that this side forms a slope bounded by the lower contour line of the first conical surface. This prevents the soil from falling into the mouse hole, saving the trouble of manually cleaning the soil pile at regular intervals. Therefore, the rapid mouse hole drilling device provided by this application can effectively improve work efficiency and reduce the waste of human resources. It should be noted that, as a preferred embodiment, Figure 1 An exemplary embodiment is shown in which the central axis of the first conical surface coincides with a radial line of the rotating body. In other embodiments, the central axis of the first conical surface can also be made approximately parallel to the radial line of the rotating body, achieving the same effect of real-time cleaning of the soil pile by the swing rod 8. To improve the cleaning effect, the rotational speed of the swing rod 8 relative to the first motor 7 should be greater than the rotational speed of the rotating body.

[0034] In a preferred embodiment, the present application further includes a second conical surface that is perpendicular to the first conical surface of the swing rod 8. That is, the swing rod 8 rotates in a straight line around a point in its middle and at an angle to it, forming a swing surface similar to a horizontally placed hourglass shape. The large end of the first conical surface faces the rotating body, so the small end of the second conical surface faces the rotating body. The part of the swing rod 8 corresponding to the first conical surface is called the first rod segment, and the part corresponding to the second conical surface is called the second rod segment. The first rod segment is responsible for cleaning the side of the soil pile near the mouse hole, and the second rod segment is responsible for cleaning the side of the soil pile away from the mouse hole. In this way, the soil brought out by the spiral impeller 1 forms a neat circle of soil pile with a triangular cross-section around the hole, so that the soil in this pile will neither fall into the hole nor spread outward.

[0035] Specifically, in this embodiment, the soil compactor includes a hinged seat 9 fixedly connected to the telescopic rod 5, and the middle part of the swing rod 8 is ball-jointed to the hinged seat 9, such as... Figure 1 and Figure 2 As shown, the hinge seat 9 has a spherical cavity 91 extending to its two opposite surfaces. The swing rod 8 passes through the spherical cavity 91, and a ball 81 is provided in the middle of the swing rod 8. The ball 81 is rotatably fitted with the spherical cavity 91. The ball-joint connection allows the swing rod 8 to rotate more smoothly. Of course, in other embodiments, a cylinder can also be provided in the middle of the swing rod 8 and rotatably connected to the hinge seat 9, so that the axis of the cylinder is set at an angle to the axis of the swing rod 8.

[0036] The installation position of the first motor 7 can be selected in various ways. For example, in this embodiment, the tamping device includes a mounting frame 6 fixedly connected to the telescopic rod 5, and the first motor 7 is fixed to the mounting frame 6. The first motor 7 is connected to the end of the swing rod 8 away from the rotating body via a crank handle 71. In other embodiments, the first motor 7 can also be fixed to the hinge seat 9. For example, the stator of the first motor 7 is fixedly connected to the hinge seat 9, and the rotor is fixedly connected to the swing rod 8, with the axis of the rotor forming an angle with the axis of the swing rod 8. To simplify the structure as much as possible, this application preferably makes the mounting frame 6 an L-shaped rod, such as... Figure 1As shown. As previously described, the tamper is connected to the lower end of the telescopic rod 5 and can move in a direction parallel to the axis of the rotating body when the telescopic rod 5 extends and retracts, thereby realizing the change of the position height of the tamper. Specifically, the extension and retraction of the telescopic rod 5 can be active or passive. For example, in this application, the telescopic rod 5 can be an electric push rod, which is automatically controlled by a controller, so that the telescopic rod 5 can extend and retract actively. As another example, in this application, the lowest point of the mounting frame 6 can be lower than the lowest point of the tamper, that is, when the lower end of the mounting frame 6 contacts the ground, it does not affect the movement of the swing rod 8, so that the telescopic rod 5 can extend and retract passively. That is to say, during the process of the rotating body drilling downwards, the upper end of the telescopic rod 5 moves downwards continuously. Since the mounting frame 6, which is fixedly connected to the telescopic rod 5, is in contact with the ground, the telescopic rod 5 continuously shortens. Since the telescopic rod 5 is fixedly connected to the rotating body through the connecting arm 3, the telescopic rod 5 rotates around the mouse hole during the downward drilling process of the rotating body. In order to reduce the impact of the contact between the mounting frame 6 and the ground on the drilling of the rotating body, this application preferably provides a wheel at the lower end of the mounting frame 6. In this way, the contact between the ground and the wheel causes the telescopic rod 5 to continuously shorten during the downward drilling process of the rotating body. At the same time, the wheel allows the telescopic rod 5 to rotate around the mouse hole more smoothly, that is, to reduce the resistance of the telescopic rod 5 rotating around the mouse hole. It should be noted that when the telescopic rod 5 adopts the above-mentioned passive telescopic scheme, the height of the tamper from the ground remains unchanged during the working process. That is, the height of the lower contour of the moving surface formed by the movement of the swing rod 8 relative to the mounting frame 6 from the ground remains unchanged. When setting the height of the tamper from the ground, the capacity of the space formed between the moving surface of the swing rod 8 and the ground to accommodate all the soil brought out during the entire drilling process should be considered. At the same time, the ability of this space to prevent the soil pile from spreading should also be considered. That is, the volume of this space should not be too small to provide sufficient capacity. Meanwhile, the height of this space near the rat hole should not be too large to prevent the swing rod 8 from not being able to clear the soil on the soil pile. When the telescopic rod 5 adopts the above-mentioned active telescopic scheme, it can be set to actively adjust its length according to the current size of the soil pile, so that the height of the tamper from the ground changes dynamically. This ensures that the tamping rod 8 effectively clears the soil pile and continuously expands the space formed between the moving surface of the tamping rod 8 and the ground. For example, as the drilling progresses, the amount of soil in the soil pile gradually increases. Therefore, in the initial stage, the height of the tamper from the ground can remain unchanged. When the space formed between the moving surface of the tamping rod 8 and the ground is about to be filled by the soil pile, the telescopic rod 5 adjusts its own length to move the height of the tamper from the ground upwards a little, so that the space expands upwards to accommodate the soil brought out during the subsequent drilling process. In this way, the soil pile gradually increases in height, and the tamper gradually moves upwards.

[0037] In a preferred embodiment, the drill bit assembly includes a second motor 16 and a plurality of rotating blades 4 arranged around the axis of a rotating body. The second motor 16 drives the rotating blades 4 to move relative to the rotating body, thereby giving the rotating blades 4 at least a first posture and a second state. In the first posture, all the rotating blades 4 are arranged together to form a disc perpendicular to the axis of the rotating body. In the second posture, all the rotating blades 4 together constitute a turbine body for cutting soil. That is, the rotating blades 4 of the drill bit assembly can adjust their posture. In the second posture, the rotating blades 4 are arranged in a turbine blade structure, enabling them to perform soil cutting.

[0038] Preferably, in this application, the outer diameters of the aforementioned disk and turbine body are both equal to the outer diameter of the helical impeller 1. That is, regardless of the first or second posture, the outer diameter of all rotating blades 4 is the same as the outer diameter of the helical impeller 1. To this end, this embodiment includes, on one hand, a rotating shaft coaxially arranged with the rotating body. The rotating shaft is rotatably connected to the rotating body and driven by a second motor 16. Multiple cylindrical rods 14, each corresponding to a rotating blade 4, are hinged to the circumferential surface of the rotating shaft. The cylindrical rods 14 can move up and down around their hinged ends with the rotating shaft (the "up and down" direction is the axial direction of the rotating body). The cylindrical rods 14 pass through the connecting holes of the rotating blades 4. A helical groove 15 is formed on the surface of the cylindrical rod 14, and a slider that mates with the helical groove 15 is provided on the inner wall of the connecting hole. This embodiment further... On the one hand, the drill bit assembly also includes a sliding body that is slidably connected to both the rotating body and the cylindrical rod 14. The sliding body is rotatably connected to the rotating blade 4. The rotating body is provided with a guide groove 13 that cooperates with the sliding body. The projection of the guide groove 13 along the axial direction of the rotating body is arc-shaped. The further the guide groove 13 is from the axis of the rotating body, the further it is from the upper end of the rotating body. For example, the guide groove 13 is opened on the lower end face of the rotating body. The distance from the bottom of the guide groove 13 to the lower end face of the rotating body is different at different points. The further away from the center of the lower end face, the smaller the distance from the bottom of the groove to the lower end face.

[0039] The following explains the principle behind the attitude adjustment of the rotating blade 4:

[0040] When drilling is required, the second motor 16 is started first, causing the shaft to rotate in the forward direction relative to the rotating body ("forward direction" means the concave side of the guide groove 13 on the cross-section of the rotating body). As the shaft rotates, the cylindrical rod 14 moves circumferentially along the rotating body. Thus, under the pressure of the cylindrical rod 14 and the guide groove 13, the sliding body moves. While the sliding body moves outward along the guide groove, it also pushes the rotating blade 4 outward along the cylindrical rod 14. Since the position on the guide groove 13 that is farther from the axis of the rotating body is farther from the upper end of the rotating body, when the sliding body moves outward along the guide groove, the cylindrical rod 14 rotates downward relative to the shaft, causing the outer side of the rotating blade 4 to tilt downward. At the same time, since the surface of the cylindrical rod 14 is provided with a helical groove 15, and the inner wall of the connecting hole of the rotating blade 4 is provided with a slider that cooperates with the helical groove 15, when the rotating blade 4 moves outward along the cylindrical rod 14, the rotating blade 4 rotates around the axis of the cylindrical rod 14. Therefore, the rotating shaft rotates forward relative to the rotating body, causing the rotating blades 4 to swing downwards while twisting and moving outwards, eventually reaching the aforementioned second posture, where all the rotating blades 4 together constitute the turbine body for cutting soil. Since the rotating blades 4 swing downwards and move outwards simultaneously, the outer diameter of this turbine body can be made equal to the outer diameter of all the rotating blades 4 before the second motor 16 is started. Before the second motor 16 is started, the rotating blades 4 are in the aforementioned first posture (i.e., the initial state), at which time the outer diameter of all the rotating blades 4 is equal to the outer diameter of the helical impeller 1. When the rotating blades 4 switch from the first posture to the second posture, the second motor 16 is turned off, the rotating shaft remains stationary relative to the rotating body, and then an external power source is started to drive the rotating body. As the rotating body rotates, the rotating blades 4 cut the soil to drill holes. After drilling is complete, the second motor 16 is started again, but this time the rotating shaft rotates in the opposite direction relative to the rotating body, thus the rotating blades 4 return to the initial state, i.e., from the second posture back to the first posture. When the rotating blades 4 retract to the position of the cylindrical rod 14 near the shaft, the rotating blades 4 return to their initial state. At this time, the outer diameter of all the rotating blades 4 is the same as the outer diameter of the spiral impeller 1, and the rotating blades 4 as a whole are perpendicular to the axis of the shaft. That is, all the rotating blades 4 are assembled into a disc. In this way, when the device is taken out of the mouse hole, it is convenient to use the rotating blades 4 to bring up the soil in the hole.

[0041] To improve the reliability of the sliding connection between the sliding body and the rotating body, this application preferably makes the cross-section of the guide groove 13 T-shaped, and correspondingly, the sliding body has a T-shaped block 12 connected to the guide groove 13. To improve the reliability of the sliding connection between the sliding body and the cylindrical rod 14, this application preferably makes the sliding body have a connecting ring 11 sleeved on the cylindrical rod 14.

[0042] In this embodiment, the drill bit assembly includes a cone fixedly connected to the lower end of the rotating shaft, with the tip of the cone pointing downwards to improve soil-breaking ability. Preferably, the rotating shaft and the cone are integrally formed, constituting... Figure 5The drill bit 10 shown.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to the 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 this application. Therefore, this application 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 device for quickly drilling rat holes, characterized in that, include: A rotating body, wherein a drill bit assembly is provided at the lower end of the rotating body, and a helical impeller is provided on the circumferential surface of the rotating body; A telescopic rod is arranged parallel to the axis of the rotating body, and the upper end of the telescopic rod is fixedly connected to the upper end of the rotating body through a connecting arm; A soil compactor, connected to the lower end of the telescopic rod, has a first motor and a swing rod driven by the first motor. The moving surface formed by the swing rod relative to the first motor includes at least a first conical surface, and the small end of the first conical surface is arranged in a direction away from the rotating body along the radial direction of the rotating body. The soil compactor includes a hinged seat fixedly connected to the telescopic rod, and the middle part of the swing rod is ball-jointed to the hinged seat. The drill bit assembly includes a second motor and a plurality of rotating blades arranged around the axis of the rotating body. The second motor drives the rotating blades to move relative to the rotating body, thereby giving the rotating blades at least a first posture and a second posture. In the first posture, all the rotating blades are assembled together to form a disc perpendicular to the axis of the rotating body. In the second posture, all the rotating blades together constitute a turbine body for cutting soil.

2. The rapid rat hole drilling device according to claim 1, characterized in that, The moving surface also includes a second conical surface that is perpendicular to the first conical surface.

3. The rapid rat hole drilling device according to claim 1, characterized in that, The soil compactor includes a mounting frame fixedly connected to the telescopic rod, and the first motor is fixed to the mounting frame. The first motor is connected to the end of the swing rod away from the rotating body via a crank handle.

4. The rapid rat hole drilling device according to claim 1, characterized in that, The outer diameter of the disc and the outer diameter of the turbine body are both equal to the outer diameter of the helical impeller.

5. The rapid rat hole drilling device according to claim 4, characterized in that, The drill bit assembly includes a rotating shaft coaxially arranged with the rotating body. The rotating shaft is rotatably connected to the rotating body and driven by the second motor. A plurality of cylindrical rods corresponding one-to-one with the rotating blades are hinged to the circumferential surface of the rotating shaft. The cylindrical rods pass through the connecting holes of the rotating blades. The surface of the cylindrical rods is provided with a spiral groove. The inner wall of the connecting hole is provided with a slider that cooperates with the spiral groove. The drill bit assembly also includes a sliding body that is slidably connected to both the rotating body and the cylindrical rod. The sliding body is rotatably connected to the rotating blade. The rotating body is provided with a guide groove that cooperates with the sliding body. The projection of the guide groove along the axial direction of the rotating body is arc-shaped, and the position on the guide groove that is farther away from the axis of the rotating body is farther away from the upper end of the rotating body.

6. The rapid rat hole drilling device according to claim 5, characterized in that, The drill bit assembly includes a cone that is fixedly connected to the lower end of the shaft.

7. The rapid rat hole drilling device according to claim 5, characterized in that, The cross-section of the guide groove is T-shaped.

8. The rapid rat hole drilling device according to claim 5, characterized in that, The sliding body has a connecting ring sleeved on the cylindrical rod.

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