A method and apparatus for harvesting sweet potatoes

Abstract

The application discloses a soil-anti-blocking sweet potato harvester and method, which comprises a walking mechanism and a digging mechanism, a soil and potato conveying and separating mechanism and a soil anti-blocking mechanism arranged on the walking mechanism. The soil and potato conveying and separating mechanism comprises a conveying and separating screen and a conveying and separating driving mechanism, and the conveying and separating screen comprises a plurality of screen rods arranged in parallel. The soil anti-blocking mechanism comprises a soil scraping disc, a soil scraping driving mechanism and a thickness detection module for detecting the thickness of the soil blocking on the screen rod. The circumferential surface of the soil scraping disc is provided with a plurality of main soil scraping grooves for accommodating different screen rods, which are uniformly distributed. The length of the corresponding arc between two adjacent main soil scraping grooves is equal to the spacing of the screen rods. The soil scraping disc is coaxially arranged with the corresponding synchronous wheel of the conveying and separating driving mechanism. The driving direction of the soil scraping driving mechanism is parallel to the axis of the screen rod. The application can automatically clean the adhered soil without manual intervention and shutdown, and is beneficial to improving the harvesting efficiency.

Description

Technical Field

[0001] This invention relates to sweet potato harvesting technology, specifically to a sweet potato harvester and method for preventing soil clogging. Background Technology

[0002] Sweet potatoes, as a bottom-line crop for global food production and a highly competitive high-quality energy crop, are not only an important food crop, cash crop, industrial raw material, and new energy source, but also a high-quality anti-cancer health food, making their production of great significance.

[0003] With the development of technology, the harvesting method of sweet potatoes has changed from traditional manual picking to mechanical harvesting, which greatly improves harvesting efficiency. For example, the sweet potato harvester disclosed in the authorization announcement number CN210746059U includes a conveying and separating device and a sweet potato harvester. The sweet potato harvester includes a frame, a digging device, a conveying and separating device, a transmission device and a walking device. The digging device is located at the front working end of the frame, the walking device is installed at the end working end of the frame, and the ground wheel is located at the bottom of the frame. The conveying and separating device is installed at an angle inside the frame through an adjustment device.

[0004] Because the soil in sweet potato fields has a certain level of moisture and viscosity, it will continuously stick to the conveying and separating device of the harvester during the harvesting process, thus affecting the separation effect and making it impossible to effectively separate the sweet potatoes from the soil. Therefore, it is necessary to manually clean the soil adhering to the conveying and separating device regularly, which is very tedious and affects the harvesting probability. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned problems and provide a sweet potato harvester that prevents soil clogging. This sweet potato harvester can automatically clean up the adhering soil without manual intervention or machine shutdown, which helps to improve harvesting efficiency.

[0006] Another objective of this invention is to provide a method for harvesting sweet potatoes without soil clogging.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A sweet potato harvester with anti-soil-clogging mechanism includes a walking mechanism and a digging mechanism, a sweet potato soil conveying and separating mechanism, and an anti-soil-clogging mechanism mounted on the walking mechanism.

[0009] Along the direction of harvesting movement, the digging mechanism is located in front of the potato soil conveying and separating mechanism;

[0010] The potato soil conveying and separating mechanism includes a conveying and separating screen and a conveying and separating drive mechanism for driving the conveying and separating screen to move in a cycle. The conveying and separating screen includes a plurality of screen rods arranged in parallel in sequence.

[0011] The anti-soil-clogging mechanism includes a scraping disc, a scraping drive mechanism for driving the scraping disc to move laterally, and a thickness detection module for detecting the soil-clogging thickness of the screen rods. The scraping disc has multiple evenly distributed main scraping grooves on its circumference to accommodate different screen rods. The length of the arc between two adjacent main scraping grooves is equal to the spacing between the screen rods. The scraping disc is coaxially arranged with the corresponding synchronous wheel of the conveying and separating drive mechanism. The driving direction of the scraping drive mechanism is parallel to the axis of the screen rods.

[0012] In a preferred embodiment of the present invention, the conveying and separating drive mechanism includes a conveying and separating drive motor and a conveying and separating transmission assembly. The conveying and separating transmission assembly is provided in at least two sets and arranged in a direction parallel to the axis of the screen rod. Each set of conveying and separating transmission assemblies includes at least two synchronous pulleys and a synchronous belt, which is connected to the synchronous pulleys in the same set. The two ends of the screen rod are respectively fixedly connected to the synchronous belts of the two sets located on both sides.

[0013] Furthermore, a synchronous shaft is provided between the different groups of synchronous wheels, and the scraper disc is laterally slidably connected to the rearmost synchronous shaft. This allows the scraping operation to be performed after the separation operation is completed, away from the excavation mechanism, thus preventing freshly excavated soil from affecting the scraper disc's operation.

[0014] Furthermore, the diameter of the rearmost synchronous wheel is larger than that of the frontmost synchronous wheel. This not only lowers the vehicle's position to receive the excavated sweet potatoes and soil, but also allows for the addition of a screen bar that works in conjunction with the main scraping groove of the scraping disc, thereby improving the efficiency of scraping.

[0015] Furthermore, the conveying and separating transmission assembly is provided in three sets, and the scraper disc is provided in two sets, which are respectively located between two different sets of synchronous pulleys.

[0016] Furthermore, the thickness detection module is located below the rearmost synchronous wheel. This module is a photoelectric sensor, comprising a transmitter and a receiver located on both sides. The transmitter has multiple transmitting ends arranged vertically, and the receiver has multiple receiving ends arranged vertically. This structure allows for real-time detection of the soil thickness on the screen bar. When the soil thickness exceeds the upper limit of the cleaning threshold, the controller activates the anti-soil-accumulation mechanism to perform a scraping operation. Furthermore, by using multiple transmitting ends, different thicknesses can be detected, making it suitable for various applications.

[0017] In a preferred embodiment of the present invention, the scraper disc is provided with a secondary scraping structure, and a plurality of such secondary scraping structures are provided and evenly distributed along the circumference of the scraper disc, the number of such secondary scraping structures being the same as the number of the main scraping grooves.

[0018] The secondary scraping structure includes a follower scraping fork and a return torsion spring. The follower scraping fork is hinged to the side of the scraping disc. The follower scraping fork includes a pressure-receiving follower part and a secondary scraping part. The pressure-receiving follower part and the secondary scraping part have a V-shaped structure. The side of the secondary scraping part facing the pressure-receiving follower part is provided with a secondary scraping groove. When the screen rod has not entered the main scraping groove, in the projection parallel to the axis of the scraping disc, the pressure-receiving follower part overlaps with the main scraping groove, which is the waiting-to-enter state. When the screen rod is in the main scraping groove, the screen rod is located in the secondary scraping groove of the follower scraping fork corresponding to the main scraping groove. In the projection parallel to the axis of the scraping disc, the secondary scraping part surrounds the screen rod on the opening side of the main scraping groove.

[0019] The reset torsion spring is used to keep the follow-up scraper fork in the ready-to-enter state when no external force is applied.

[0020] The advantage of the above structure is that, since the main scraping trough is an open structure, it cannot scrape the screen rod 360 degrees, resulting in dead corners. Therefore, a secondary scraping structure is needed to complete the scraping work in these dead corners. Specifically, when the screen rod and the main scraping trough corresponding to the scraping disc move synchronously to the matching position, the screen rod enters the main scraping trough and is squeezed against the corresponding pressure-bearing follower part. This pressure-bearing follower part is then driven to swing in the direction of the center. At the same time, the secondary scraping part approaches the screen rod around the hinge center, so that the screen rod is located inside the secondary scraping trough. At this time, the secondary scraping part surrounds the screen rod on the open side of the main scraping trough, thereby scraping the screen rod in the dead corners of the main scraping trough and thoroughly removing the soil from the screen rod. Furthermore, after the screen bar completes the reversal around the axis of the synchronous wheel, the screen bar will push the follower scraper fork outward, out of the main scraper groove, and away from the scraper disc. The follower scraper fork returns to the ready-to-enter state, and the reset torsion spring ensures that the follower scraper fork remains in this state until it engages with the next screen bar.

[0021] In a preferred embodiment of the present invention, the soil scraping drive mechanism includes a soil scraping drive cylinder, which is a rodless cylinder. The cylinder body of the rodless cylinder is fixedly connected to a corresponding synchronous pulley, and the slider of the rodless cylinder is fixedly connected to the soil scraping disc.

[0022] In a preferred embodiment of the present invention, the soil scraping drive mechanism includes an electric push rod, the housing of which is fixedly connected to a corresponding synchronous wheel, and the telescopic rod of which is fixedly connected to the soil scraping disc.

[0023] A method for harvesting sweet potatoes without soil clogging includes the following steps:

[0024] Towing is carried out by a tractor;

[0025] The digging mechanism loosens and digs up the sweet potatoes, soil and other debris together. As the tractor moves forward, the sweet potato and soil mixture piles up and is squeezed together, and moves backward toward the conveyor separation screen, which then takes the sweet potato and soil mixture and conveys it backward.

[0026] During the conveying process, larger sweet potatoes remain on the screen bars of the conveying and separating screen, while smaller soil and other impurities fall back to the ground through the gaps between the screen bars.

[0027] When the screen rod moves to the outside of the synchronous wheel of the conveying and separating drive mechanism, it will enter the main scraping groove corresponding to the scraping disc. At this time, the scraping disc and the screen rod rotate forward synchronously. When the screen rod changes direction, it will come out of the main scraping groove and move away from the scraping disc, and then move in a cycle.

[0028] The thickness detection module measures the soil thickness on the screen rod in real time. When the soil thickness exceeds the upper limit of the cleaning threshold, the scraping drive mechanism drives the scraping disc to move laterally, scraping the screen rod located in the main scraping groove to remove the soil adhering to the screen rod. The scraping operation is repeated until the detected soil thickness is less than the lower limit of the cleaning threshold.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] The anti-soil-clogging sweet potato harvester of the present invention is equipped with a scraping disc with a main scraping groove. When the soil clogging thickness is greater than the upper limit of the cleaning threshold, the scraping disc is driven by the scraping drive mechanism to move laterally and scrape the screen rod located in the main scraping groove laterally, thereby automatically removing the soil adhering to the screen rod without manual intervention or machine shutdown, which helps to improve harvesting efficiency. Attached Figure Description

[0031] Figure 1-2 These are three-dimensional structural schematic diagrams of the anti-clogging sweet potato harvester of the present invention from two different perspectives.

[0032] Figure 3 This is a rear view of the anti-clogging sweet potato harvester of the present invention.

[0033] Figure 4 for Figure 2 Enlarged view in the image.

[0034] Figure 5 This is a side view of the scraper disc, auxiliary scraper structure, screen rod, and partial synchronous belt of the present invention.

[0035] Figure 6 This is a three-dimensional structural diagram of the scraper disc and auxiliary scraper structure of the present invention. Detailed Implementation

[0036] To enable those skilled in the art to fully understand the technical solutions of the present invention, the present invention will be further described below in conjunction with embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0037] The anti-clogging sweet potato harvester of this embodiment includes a walking mechanism and a digging mechanism, a sweet potato soil conveying and separating mechanism, and an anti-clogging mechanism disposed on the walking mechanism; specifically, the structure of the walking mechanism and the digging mechanism of this embodiment can refer to the prior art, and along the direction of harvesting movement, the digging mechanism is located in front of the sweet potato soil conveying and separating mechanism.

[0038] See Figure 1-2 The potato soil conveying and separating mechanism includes a conveying and separating screen and a conveying and separating drive mechanism for driving the conveying and separating screen to move in a cycle. The conveying and separating screen includes a plurality of screen rods 1 arranged in parallel in sequence. The conveying and separating drive mechanism includes a conveying and separating drive motor (not shown in the figure) and a conveying and separating transmission assembly. The conveying and separating transmission assembly is provided in at least two sets and is arranged in a direction parallel to the axis of the screen rod 1. Each set of conveying and separating transmission assemblies includes at least two synchronous pulleys 2 and a synchronous belt 3. The synchronous belt 3 is connected to the synchronous pulleys 2 in the same set. The two ends of the screen rod 1 are respectively fixedly connected to the synchronous belts 3 located on both sides.

[0039] See Figure 4-6 The anti-soil-clogging mechanism includes a scraper disc 4, a scraping drive mechanism for driving the scraper disc 4 to move laterally, and a thickness detection module for detecting the soil-clogging thickness of the screen rod 1. The scraper disc 4 has multiple evenly distributed main scraping grooves 4-1 on its circumference to accommodate different screen rods 1. The length of the arc between two adjacent main scraping grooves 4-1 is equal to the spacing between the screen rods 1. The scraper disc 4 is coaxially arranged with the synchronous wheel 2 located at the rear of the conveying and separating drive mechanism. The driving direction of the scraping drive mechanism is parallel to the axis of the screen rod 1.

[0040] See Figure 1-2 Synchronous shafts 5 are provided between different sets of synchronous wheels 2, and the scraper disc 4 is laterally slidably connected to the synchronous shaft 5 located at the rear. In this way, it can be moved away from the excavation mechanism, and the scraping operation can be performed after the separation operation is completed, avoiding the freshly excavated soil from affecting the operation of the scraper disc 4.

[0041] Furthermore, the diameter of the rearmost synchronous wheel 2 is larger than that of the frontmost synchronous wheel 2. This not only lowers the posture to receive the excavated sweet potatoes and soil, but also increases the screen rod 1 that cooperates with the main scraping groove 4-1 of the scraping disc 4 to improve the efficiency of scraping soil.

[0042] Furthermore, the conveying and separating transmission assembly is provided in three sets, and the scraper disc 4 is provided in two sets, which are respectively located between two different sets of synchronous pulleys 2.

[0043] See Figure 3 The thickness detection module is located below the rearmost synchronous wheel 2. This module is a photoelectric sensor, comprising a transmitter 6 and a receiver 7 located on either side. The transmitter 6 has multiple transmitting ends arranged vertically, and the receiver 7 has multiple receiving ends arranged vertically. This structure allows for real-time detection of the soil thickness on the screen rod 1. When the soil thickness exceeds the upper limit of the cleaning threshold, the controller activates the anti-soil-accumulation mechanism to perform a scraping operation. Furthermore, by using multiple transmitting ends, different thicknesses can be detected, making it suitable for various applications.

[0044] See Figure 4-6 The scraper disc 4 is provided with a secondary scraping structure. Multiple secondary scraping structures are evenly distributed along the circumference of the scraper disc 4, and the number of these structures is the same as the number of the main scraping grooves 4-1. Each secondary scraping structure includes a follower scraping fork 8 and a return torsion spring (not shown in the figure). The follower scraping fork 8 is hinged to the side of the scraper disc 4. The follower scraping fork 8 includes a pressure-bearing follower part 8-1 and a secondary scraping part 8-2. The pressure-bearing follower part 8-1 and the secondary scraping part 8-2 have a V-shaped structure. A secondary scraping groove 8- is provided on the side of the secondary scraping part 8-2 facing the pressure-bearing follower part 8-1. 3; When the screen rod 1 is not in the main scraping groove 4-1, in the projection parallel to the axis of the scraping disc 4, the pressure-bearing follower part 8-1 overlaps with the main scraping groove 4-1, which is the waiting-to-enter state; when the screen rod 1 is in the main scraping groove 4-1, the screen rod 1 is located in the secondary scraping groove 8-3 of the follower scraping fork 8 corresponding to the main scraping groove 4-1, and in the projection parallel to the axis of the scraping disc 4, the secondary scraping part 8-2 surrounds the screen rod 1 on the opening side of the main scraping groove 4-1; the reset torsion spring is used to keep the follower scraping fork 8 in the waiting-to-enter state when no external force is applied.

[0045] The advantage of the above structure is that, since the main scraping groove 4-1 is an open structure, it cannot scrape the screen rod 1 360 degrees, resulting in dead corners. Therefore, a secondary scraping structure is needed to complete the scraping work in the dead corners. Specifically, when the screen rod 1 and the main scraping groove 4-1 corresponding to the scraping disc 4 move synchronously to the matching position, when the screen rod 1 enters the main scraping groove 4-1, it will be squeezed onto the corresponding pressure-receiving follower part 8-1, and then drive the pressure-receiving follower part 8-1 to swing in the direction of the center. At the same time, the secondary scraping part 8-2 approaches the screen rod 1 around the hinge center, so that the screen rod 1 is located inside the secondary scraping groove 8-3. At this time, the secondary scraping part 8-2 surrounds the screen rod 1 on the open side of the main scraping groove 4-1, thereby scraping the screen rod 1 in the dead corner position of the main scraping groove 4-1 and thoroughly removing the soil on the screen rod 1. Furthermore, after the screen rod 1 completes the reversal around the axis of the synchronous wheel 2, the screen rod 1 will push the follower scraper fork 8 outward, out of the main scraper groove 4-1, and away from the scraper disc 4. The follower scraper fork 8 returns to the ready-to-enter state, and the reset torsion spring ensures that the follower scraper fork 8 remains in this state until it engages with the next screen rod 1.

[0046] See Figure 4-6 The soil scraping drive mechanism includes a soil scraping drive cylinder, which is a rodless cylinder 9. The cylinder body of the rodless cylinder 9 is fixedly connected to the corresponding synchronous wheel 2, and the slider of the rodless cylinder 9 is fixedly connected to the soil scraping disc 4.

[0047] Alternatively, the soil scraping drive mechanism can also be an electric push rod, the housing of which is fixedly connected to the corresponding synchronous wheel 2, and the telescopic rod of which is fixedly connected to the soil scraping disc 4.

[0048] See Figure 1-2 and Figure 6 The method for harvesting sweet potatoes to prevent soil clogging in this embodiment includes the following steps:

[0049] Towing is carried out by a tractor.

[0050] The digging mechanism loosens and excavates the sweet potatoes, soil, and other debris together. As the tractor moves forward, the sweet potato and soil mixture piles up and is compressed together, moving backward toward the conveyor separation screen, which then takes over the mixture and conveys it backward.

[0051] During the conveying process, larger sweet potatoes remain on screen bar 1 of the conveying and separating screen, while smaller soil and other impurities fall back to the ground through the gaps between screen bars 1.

[0052] When the screen rod 1 moves to the outside of the synchronous wheel 2 of the conveying and separating drive mechanism, it will enter the main scraping groove 4-1 corresponding to the scraping disc 4. At this time, the scraping disc 4 and the screen rod 1 rotate forward synchronously. When the screen rod 1 changes direction, it will come out of the main scraping groove 4-1 and move away from the scraping disc 4, and then move in a cycle.

[0053] The thickness of the soil pile on the screen rod 1 is detected in real time by the thickness detection module. When the soil pile thickness is greater than the upper limit of the cleaning threshold, the scraping drive mechanism drives the scraping disc 4 to move laterally. This scrapes the screen rod 1, which is located in the main scraping groove 4-1, to remove the soil adhering to the screen rod 1. The scraping operation is repeated until the detected soil pile thickness is less than the lower limit of the cleaning threshold.

[0054] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A sweet potato harvester with anti-clogging properties, characterized in that, It includes a traveling mechanism and an excavation mechanism, a soil conveying and separating mechanism, and a soil-preventing mechanism mounted on the traveling mechanism; Along the direction of harvesting movement, the digging mechanism is located in front of the potato soil conveying and separating mechanism; The potato soil conveying and separating mechanism includes a conveying and separating screen and a conveying and separating drive mechanism for driving the conveying and separating screen to move in a cycle. The conveying and separating screen includes a plurality of screen rods arranged in parallel in sequence. The anti-soil-clogging mechanism includes a scraping disc, a scraping drive mechanism for driving the scraping disc to move laterally, and a thickness detection module for detecting the soil-clogging thickness of the screen rods. The scraping disc has multiple evenly distributed main scraping grooves on its circumference to accommodate different screen rods. The length of the arc between two adjacent main scraping grooves is equal to the spacing between the screen rods. The scraping disc is coaxially arranged with the corresponding synchronous wheel of the conveying and separating drive mechanism. The driving direction of the scraping drive mechanism is parallel to the axis of the screen rods. The scraper disc is provided with a secondary scraping structure. Multiple secondary scraping structures are provided and are evenly distributed along the circumference of the scraper disc. The number of secondary scraping structures is the same as the number of main scraping grooves. The secondary scraping structure includes a follower scraping fork and a return torsion spring. The follower scraping fork is hinged to the side of the scraping disc. The follower scraping fork includes a pressure-receiving follower part and a secondary scraping part. The pressure-receiving follower part and the secondary scraping part have a V-shaped structure. The side of the secondary scraping part facing the pressure-receiving follower part is provided with a secondary scraping groove. When the screen rod has not entered the main scraping groove, in the projection parallel to the axis of the scraping disc, the pressure-receiving follower part overlaps with the main scraping groove, which is the waiting-to-enter state. When the screen rod is in the main scraping groove, the screen rod is located in the secondary scraping groove of the follower scraping fork corresponding to the main scraping groove. In the projection parallel to the axis of the scraping disc, the secondary scraping part surrounds the screen rod on the opening side of the main scraping groove. The reset torsion spring is used to keep the follow-up scraper fork in the ready-to-enter state when no external force is applied.

2. The anti-clogging sweet potato harvester according to claim 1, characterized in that, The conveying and separating drive mechanism includes a conveying and separating drive motor and a conveying and separating transmission assembly. The conveying and separating transmission assembly has at least two sets and is arranged in a direction parallel to the axis of the screen rod. Each set of conveying and separating transmission assemblies includes at least two synchronous pulleys and a synchronous belt, which is connected to the synchronous pulleys in the same set. The two ends of the screen rod are respectively fixedly connected to the synchronous belts of the two sets located on both sides.

3. The anti-clogging sweet potato harvester according to claim 2, characterized in that, Synchronous shafts are provided between different groups of synchronous wheels, and the scraper disc is laterally slidably connected to the synchronous shaft located at the rear.

4. The anti-clogging sweet potato harvester according to claim 2, characterized in that, The diameter of the synchronizing pulley located at the rear is larger than the diameter of the synchronizing pulley located at the front.

5. The anti-clogging sweet potato harvester according to claim 2, characterized in that, The conveying and separating transmission assembly has three sets, and the scraper disc has two sets, which are located between two different sets of synchronous pulleys.

6. The anti-clogging sweet potato harvester according to claim 2, characterized in that, The thickness detection module is located below the rearmost synchronous wheel. The thickness detection module is a photoelectric sensor, which includes a transmitter and a receiver located on both sides. The transmitter has multiple transmitting ends arranged vertically, and the receiver has multiple receiving ends arranged vertically.

7. The anti-clogging sweet potato harvester according to claim 1, characterized in that, The soil scraping drive mechanism includes a soil scraping drive cylinder, which is a rodless cylinder. The cylinder body of the rodless cylinder is fixedly connected to the corresponding synchronous wheel, and the slider of the rodless cylinder is fixedly connected to the soil scraping disc.

8. The anti-clogging sweet potato harvester according to claim 1, characterized in that, The soil scraping drive mechanism includes an electric push rod, the housing of which is fixedly connected to a corresponding synchronous wheel, and the telescopic rod of which is fixedly connected to the soil scraping disc.

9. A method for harvesting sweet potatoes to prevent soil clogging, applied to the anti-clogging sweet potato harvester according to any one of claims 1-8, characterized in that, Includes the following steps: Towing is carried out by a tractor; The digging mechanism loosens and digs up the sweet potatoes and soil together. As the tractor moves forward, the sweet potato and soil mixture piles up and is squeezed together, and moves backward toward the conveyor separation screen, which then takes the sweet potato and soil mixture and conveys it backward. During the conveying process, larger sweet potatoes remain on the screen bars of the conveying and separating screen, while smaller soil and impurities fall back to the ground through the gaps between the screen bars. When the screen rod moves to the outside of the synchronous wheel of the conveying and separating drive mechanism, it will enter the main scraping groove corresponding to the scraping disc. At this time, the scraping disc and the screen rod rotate forward synchronously. When the screen rod changes direction, it will come out of the main scraping groove and move away from the scraping disc, and then move in a cycle. The thickness detection module measures the soil thickness on the screen rod in real time. When the soil thickness exceeds the upper limit of the cleaning threshold, the scraper drive mechanism drives the scraper disc to move laterally, scraping the screen rod located in the main scraper trough to remove the soil adhering to the screen rod. This continues until the detected soil thickness is less than the lower limit of the cleaning threshold.

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