Anti-hilling sweet potato harvester and method

Abstract

The invention discloses a hilling prevention sweet potato harvester and a hilling prevention method. The harvester comprises a walking mechanism, and a digging mechanism, a potato and soil conveying and separating mechanism and a hilling prevention mechanism which are arranged on the walking mechanism, the potato and soil conveying and separating mechanism comprises a conveying and separating sieve and a conveying and separating driving mechanism; the conveying and separating sieve comprises a plurality of sieve rods which are sequentially arranged in parallel; the soil hilling prevention mechanism comprises a soil scraping disc, a soil scraping driving mechanism and a thickness detection module used for detecting the soil hilling thickness of the screening rods, a plurality of main soil scraping grooves which are evenly distributed and used for containing different screening rods are formed in the circumferential face of the soil scraping disc, and the length of a corresponding arc line between every two adjacent main soil scraping grooves is equal to the distance between the screening rods; the soil scraping disc and a synchronous wheel corresponding to the conveying and separating driving mechanism are coaxially arranged; and the driving direction of the soil scraping driving mechanism is parallel to the axis of the sieve rod. The device can automatically clean adhered soil, manual intervention is not needed, shutdown is not needed, and the harvesting efficiency can be improved.

Description

Technical Field

[0001] The invention relates to a sweet potato harvesting technology, and in particular to an anti-soil-covering sweet potato harvester and a method. Background Art

[0002] As the bottom line crop of the world's food production and a highly competitive high-quality energy crop, sweet potato is not only an important food crop, cash crop, industrial raw material and new energy material, but also a high-quality anti-cancer health food. Its production is of great significance.

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

[0004] Since the soil in the sweet potato field has a certain humidity and viscosity, during the harvesting process, the soil will continue to stick to the conveying and separation device of the harvester, thus affecting the separation effect and failing to effectively separate the sweet potatoes and the soil. Therefore, it is necessary to manually clean the soil adhering to the conveying and separation device regularly, which is very cumbersome and affects the probability of harvesting. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems and provide a soil-proof sweet potato harvester, which can automatically clean up the adhered soil without manual intervention or shutdown, thereby improving the harvesting efficiency.

[0006] Another object of the present invention is to provide a method for harvesting sweet potatoes with the anti-mounding soil function.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A soil-blocking-proof sweet potato harvester comprises a traveling mechanism, and a digging mechanism, a potato-soil conveying and separating mechanism, and a soil-blocking-proof mechanism arranged on the traveling mechanism;

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

[0010] The potato-soil conveying and separation mechanism comprises a conveying and separation screen and a conveying and separation driving mechanism for driving the conveying and separation screen to move cyclically, and the conveying and separation screen comprises a plurality of screen bars arranged in parallel in sequence;

[0011] The anti-earth-blocking mechanism includes a scraper plate, a scraper drive mechanism for driving the scraper plate to move laterally, and a thickness detection module for detecting the thickness of earth-blocking of the screen rod. A plurality of evenly distributed main scraper grooves for accommodating different screen rods are provided on the circumferential surface of the scraper plate. The length of the corresponding arc between two adjacent main scraper grooves is equal to the spacing between the screen rods. The scraper plate is coaxially arranged with the corresponding synchronous wheel of the conveying and separation drive mechanism; the driving direction of the scraper drive mechanism is parallel to the axis of the screen rod.

[0012] A preferred embodiment of the present invention, wherein the conveying and separation driving mechanism includes a conveying and separation driving motor and a conveying and separation transmission assembly, wherein the conveying and separation transmission assembly is provided with at least two groups and the arrangement direction is parallel to the axis of the screen rod, and each group of the conveying and separation transmission assembly includes at least two synchronous wheels and a synchronous belt, and the synchronous belt is connected to the synchronous wheels of the same group; the two ends of the screen rod are respectively fixedly connected to the two groups of synchronous belts located on both sides.

[0013] Furthermore, a synchronous shaft is arranged between different groups of synchronous wheels, and the scraper plate can be slidably connected to the synchronous shaft at the rear, so that the scraper plate can be scraped away from the excavation mechanism after the separation operation is completed, so as to avoid the newly excavated soil affecting the operation of the scraper plate.

[0014] Furthermore, the diameter of the synchronous wheel at the rear is larger than the diameter of the synchronous wheel at the front, which not only lowers the posture to receive the excavated sweet potatoes and soil, but also increases the sieve rod that cooperates with the main scraping groove of the scraper disc to improve the scraping efficiency.

[0015] Furthermore, the conveying and separation transmission components are provided with three groups, and the scraping discs are provided with two and are respectively located between two different groups of synchronous wheels.

[0016] Furthermore, the thickness detection module is arranged below the rearmost synchronous wheel. The thickness detection module is a photoelectric sensor. The photoelectric sensor includes a transmitter and a receiver respectively located on both sides. The transmitter is provided with a plurality of transmitting ends, and the plurality of transmitting ends are arranged vertically; the receiver is provided with a plurality of receiving ends, and the plurality of receiving ends are arranged vertically. Through the above structure, the thickness of the soil on the screen rod can be detected in real time. When the thickness of the soil is greater than the upper limit of the cleaning threshold, the anti-soil mechanism is controlled by the controller to perform the soil scraping operation. Furthermore, by setting a plurality of transmitting ends, different thicknesses can be detected, which is suitable for different use occasions.

[0017] In a preferred embodiment of the present invention, the scraper disc is provided with auxiliary scraper structures, and the auxiliary scraper structures are provided in plurality and are evenly distributed along the circumference of the scraper disc, and the number of the auxiliary scraper structures is the same as the number of the main scraper grooves;

[0018] The auxiliary scraping structure includes a follower scraping fork and a reset torsion spring, the follower scraping fork is hinged on the side of the scraping plate, the follower scraping fork includes a pressure follower part and an auxiliary scraping part, the pressure follower part and the auxiliary scraping part are in a V-shaped structure, and the auxiliary scraping part is provided with an auxiliary scraping groove on the side facing the pressure follower part; when the screen rod has not entered the main scraping groove, in the projection parallel to the axis of the scraping plate, the pressure follower part overlaps with the main scraping groove, which is a waiting-to-enter state; when the screen rod is located in the main scraping groove, the screen rod is located in the auxiliary scraping groove of the follower scraping fork corresponding to the main scraping groove, and in the projection parallel to the axis of the scraping plate, the auxiliary scraping part surrounds the screen rod at the opening side of the main scraping groove;

[0019] The return torsion spring is used for urging the follower soil scraping fork to remain in the waiting state when no external force acts.

[0020] The advantage of the above structure is that since the main scraper trough is an open structure, it is impossible to scrape the screen rod 360 degrees and there are dead corners. Therefore, it is necessary to use an auxiliary scraper structure to complete the scraping work in the dead corners. Specifically, when the main scraper troughs corresponding to the screen rod and the scraper plate move synchronously to the matching position, the screen rod will be squeezed onto the corresponding compressed follower when entering the main scraper trough, and then the compressed follower will be driven to swing in the direction of the center of the circle. At the same time, the auxiliary scraper part approaches the screen rod around the hinge center, so that the screen rod is located in the auxiliary scraper trough. At this time, the auxiliary scraper part surrounds the screen rod on the open side of the main scraper trough, so that the screen rod can be scraped at the dead corner of the main scraper trough to completely remove the soil on the screen rod. Furthermore, when the screen rod completes the reversal around the axis of the synchronous wheel, the screen rod will push the follower scraper fork outward, come out of the main scraper groove, and then move away from the scraper plate. The follower scraper fork returns to the waiting state and is ensured to remain in the changed state through the reset torsion spring until it cooperates with the next screen rod.

[0021] A preferred embodiment of the present invention, wherein the scraping drive mechanism comprises a scraping drive cylinder, which is a rodless cylinder, a cylinder body of the rodless cylinder is fixedly connected to the corresponding synchronous wheel, and a slider of the rodless cylinder is fixedly connected to the scraping disc.

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

[0023] A method for harvesting sweet potatoes with soil protection comprises the following steps:

[0024] Towing by tractor;

[0025] The sweet potatoes, soil and other debris are loosened and dug up by the digging mechanism. As the tractor moves forward, the sweet potato and soil mixture is piled up and squeezed together, and moves backwards to the conveying separation screen, and then the conveying separation screen takes over the sweet potato and soil mixture and transports it backwards;

[0026] During the transportation, the larger sweet potatoes stay on the screen bars of the conveying separation screen, while the smaller soil and other impurities fall back to the ground through the gaps between the screen bars;

[0027] When the screen bar moves to the outside of the synchronous wheel of the conveying and separation drive mechanism, it will enter the main scraping groove corresponding to the scraping plate. At this time, the scraping plate and the screen bar rotate forward synchronously; when the screen bar changes direction, it comes out of the main scraping groove and moves away from the scraping plate to move in a cycle;

[0028] The thickness detection module measures the thickness of the soil on the screen rod in real time. When the thickness of the soil is greater than the upper limit of the cleaning threshold, the scraper drive mechanism drives the scraper plate to move laterally, and the screen rod in the main scraper trough is scraped laterally to remove the soil adhering to the screen rod; the above-mentioned scraping operation is performed 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 beneficial effects:

[0030] The anti-soil-covering sweet potato harvester of the present invention is provided with a scraper plate with a main scraper groove. When the thickness of the soil cover is greater than the upper limit of the cleaning threshold, the scraper plate is driven by a scraper driving mechanism to move laterally, and the screen rod located in the main scraper groove is scraped laterally, thereby automatically removing the soil adhered to the screen rod, without the need for manual intervention or shutdown, which is beneficial to improving the harvesting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1-2 The present invention is a schematic diagram of the three-dimensional structure of the anti-soil-covering sweet potato harvester from two different viewing angles.

[0032] Figure 3 It is a rear view of the anti-soil-covering sweet potato harvester of the present invention.

[0033] Figure 4 for Figure 2 Enlarged image of .

[0034] Figure 5 It is a side view of the scraper plate, auxiliary scraper structure, screen rod and local synchronous belt of the present invention.

[0035] Figure 6 It is a three-dimensional structural schematic diagram of the scraper plate and the auxiliary scraper structure of the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0037] The anti-soil-burying sweet potato harvester of the present embodiment includes a walking mechanism and a digging mechanism, a potato-soil conveying and separation mechanism, and an anti-soil-burying mechanism arranged on the walking mechanism; specifically, the structures of the walking mechanism and the digging mechanism of the present embodiment can refer to the prior art, and along the direction of harvesting movement, the digging mechanism is located in front of the potato-soil conveying and separation mechanism.

[0038] See also Figure 1-2 The potato and soil conveying and separation mechanism includes a conveying and separation screen and a conveying and separation driving mechanism for driving the conveying and separation screen to move in a cycle, wherein the conveying and separation screen includes a plurality of screen rods 1 arranged in parallel in sequence; wherein the conveying and separation driving mechanism includes a conveying and separation driving motor (not shown in the figure) and a conveying and separation transmission assembly, wherein the conveying and separation transmission assembly is provided with at least two groups and the arrangement direction is parallel to the axis of the screen rod 1, and each group of the conveying and separation transmission assembly includes at least two synchronous wheels 2 and a synchronous belt 3, and the synchronous belt 3 is connected to the synchronous wheels 2 of the same group; the two ends of the screen rod 1 are respectively fixedly connected to the two groups of synchronous belts 3 located on both sides.

[0039] See also Figure 4-6 The anti-earth-blocking mechanism includes a scraper plate 4, a scraper drive mechanism for driving the scraper plate 4 to move laterally, and a thickness detection module for detecting the thickness of the earth-blocking of the screen bar 1. The circumferential surface of the scraper plate 4 is provided with a plurality of evenly distributed main scraper grooves 4-1 for accommodating different screen bars 1. The length of the corresponding arc between two adjacent main scraper grooves 4-1 is equal to the spacing between the screen bars 1. The scraper plate 4 is coaxially arranged with the synchronous wheel 2 located at the rear of the conveying and separation drive mechanism; the driving direction of the scraper drive mechanism is parallel to the axis of the screen bar 1.

[0040] See also Figure 1-2 A synchronous shaft 5 is provided between different groups of synchronous wheels 2, and the scraper plate 4 can be slidably connected to the rearmost synchronous shaft 5. In this way, the scraper plate 4 can be moved away from the excavation mechanism and perform the scraping operation after the separation operation is completed, so as to avoid the newly excavated soil from affecting the operation of the scraper plate 4.

[0041] Furthermore, the diameter of the synchronous wheel 2 at the rear is larger than the diameter of the synchronous wheel 2 at the front, which 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 scraper plate 4 to improve the scraping efficiency.

[0042] Furthermore, the conveying and separation transmission components are provided with three groups, and the scraping discs 4 are provided with two and are respectively located between two different groups of synchronous wheels 2 .

[0043] See also Figure 3 The thickness detection module is arranged below the rearmost synchronous wheel 2. The thickness detection module is a photoelectric sensor. The photoelectric sensor includes a transmitter 6 and a receiver 7 respectively located on both sides. The transmitter 6 is provided with a plurality of transmitting ends arranged vertically; the receiver 7 is provided with a plurality of receiving ends arranged vertically. Through the above structure, the thickness of the soil on the screen bar 1 can be detected in real time. When the thickness of the soil is greater than the upper limit of the cleaning threshold, the anti-soil mechanism is controlled by the controller to perform the soil scraping operation. Furthermore, by setting a plurality of transmitting ends, different thicknesses can be detected, which is suitable for different use occasions.

[0044] See also Figure 4-6 , the scraper plate 4 is provided with an auxiliary scraper structure, which is provided with multiple auxiliary scraper structures and is evenly distributed along the circumferential direction of the scraper plate 4, and the number of the auxiliary scraper structures is the same as the number of the main scraper grooves 4-1; the auxiliary scraper structure includes a follower scraper fork 8 and a reset torsion spring (not shown in the figure), the follower scraper fork 8 is hinged on the side of the scraper plate 4, the follower scraper fork 8 includes a pressure follower part 8-1 and an auxiliary scraper part 8-2, the pressure follower part 8-1 and the auxiliary scraper part 8-2 are V-shaped structures, and the auxiliary scraper part 8-2 is provided with an auxiliary scraper groove 8-1 on the side facing the pressure follower part 8-1. 3; when the screen rod 1 has not entered the main scraper groove 4-1, in the projection parallel to the axis of the scraper plate 4, the compressed follower part 8-1 overlaps with the main scraper groove 4-1, which is a waiting-to-enter state; when the screen rod 1 is located in the main scraper groove 4-1, the screen rod 1 is located in the auxiliary scraper groove 8-3 of the follower scraper fork 8 corresponding to the main scraper groove 4-1, and in the projection parallel to the axis of the scraper plate 4, the auxiliary scraper part 8-2 surrounds the screen rod 1 on the opening side of the main scraper groove 4-1; the reset torsion spring is used to cause the follower scraper fork 8 to remain in the waiting-to-enter state when no external force is applied.

[0045] The advantage of the above structure is that since the main scraper trough 4-1 is an open structure, it is not possible to scrape the screen rod 1 360 degrees, and there are dead corners. Therefore, it is necessary to use an auxiliary scraper structure to complete the scraping work in the dead corners. Specifically, when the screen rod 1 and the main scraper trough 4-1 corresponding to the scraper plate 4 move synchronously to the matching position, when the screen rod 1 enters the main scraper trough 4-1, it will be squeezed onto the corresponding compressed follower 8-1, and then the compressed follower 8-1 will be driven to swing in the direction of the center of the circle. At the same time, the auxiliary scraper part 8-2 approaches the screen rod 1 around the hinge center, so that the screen rod 1 is located in the auxiliary scraper trough 8-3. At this time, the auxiliary scraper part 8-2 surrounds the screen rod 1 on the open side of the main scraper trough 4-1, so that the screen rod 1 can be scraped at the dead corner of the main scraper trough 4-1, and the soil on the screen rod 1 can be completely removed. Furthermore, when 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, come out of the main scraper groove 4-1, and then move away from the scraper plate 4. The follower scraper fork 8 returns to the waiting state and is ensured to remain in the changed state through the reset torsion spring until it cooperates with the next screen rod 1.

[0046] See also Figure 4-6 The scraping drive mechanism includes a 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 scraping plate 4.

[0047] Alternatively, the scraping drive mechanism may also adopt 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 scraping disc 4 .

[0048] See also Figure 1-2 and Figure 6 The anti-soil-covering sweet potato harvesting method of the present embodiment comprises the following steps:

[0049] Towing is done by tractor.

[0050] The sweet potatoes, soil and other debris are loosened and dug up together through the excavation mechanism. As the tractor moves forward, the sweet potato-soil mixture is piled up and squeezed against each other, and moves backwards toward the conveying separation screen, which then takes over the sweet potato-soil mixture and transports it backwards.

[0051] During the transportation, the sweet potatoes with larger volume stay on the screen bars 1 of the conveying separation screen, and the soil and other impurities with smaller volume fall back to the ground through the gaps between the screen bars 1.

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

[0053] The thickness detection module measures the thickness of the soil on the screen rod 1 in real time. When the thickness is greater than the upper limit of the cleaning threshold, the scraper plate 4 is driven by the scraper drive mechanism to move laterally, and the screen rod 1 in the main scraper trough 4-1 is scraped laterally to remove the soil adhered to the screen rod 1. The above-mentioned scraping operation is performed until the detected thickness is less than the lower limit of the cleaning threshold.

[0054] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A soil-preventing sweet potato harvester, characterized in that: It includes a traveling mechanism and a digging mechanism, a potato-soil conveying and separation mechanism, and an anti-soil-covering mechanism arranged on the traveling mechanism; Along the direction of harvesting movement, the digging mechanism is located in front of the potato-soil conveying and separation mechanism; The potato-soil conveying and separation mechanism comprises a conveying and separation screen and a conveying and separation driving mechanism for driving the conveying and separation screen to move cyclically, and the conveying and separation screen comprises a plurality of screen bars arranged in parallel in sequence; The anti-earth-blocking mechanism includes a scraper plate, a scraper drive mechanism for driving the scraper plate to move laterally, and a thickness detection module for detecting the thickness of earth-blocking of the screen rod. A plurality of evenly distributed main scraper grooves for accommodating different screen rods are provided on the circumferential surface of the scraper plate. The length of the corresponding arc between two adjacent main scraper grooves is equal to the spacing between the screen rods. The scraper plate is coaxially arranged with the corresponding synchronous wheel of the conveying and separation drive mechanism; the driving direction of the scraper drive mechanism is parallel to the axis of the screen rod.

2. The anti-soil sweet potato harvester according to claim 1, characterized in that: The conveying and separation driving mechanism includes a conveying and separation driving motor and a conveying and separation transmission assembly. The conveying and separation transmission assembly is provided with at least two groups and the arrangement direction is parallel to the axis of the screen rod. Each group of conveying and separation transmission assemblies includes at least two synchronous wheels and a synchronous belt, and the synchronous belt is connected to the synchronous wheels of the same group; the two ends of the screen rod are respectively fixedly connected to the two groups of synchronous belts located on both sides.

3. The anti-soil sweet potato harvester according to claim 2, characterized in that: A synchronous rotating shaft is arranged between the synchronous wheels of different groups, and the scraper disc can be connected to the synchronous rotating shaft located at the rear in a transversely slidable manner.

4. The anti-soil sweet potato harvester according to claim 2, characterized in that: The diameter of the rearmost synchronous wheel is larger than the diameter of the frontmost synchronous wheel.

5. The anti-soil sweet potato harvester according to claim 2, characterized in that: The conveying and separating transmission components are provided with three groups, and the scraping discs are provided with two groups and are respectively located between two different groups of synchronous wheels.

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

7. The anti-soil sweet potato harvester according to claim 1, characterized in that: The scraper disc is provided with auxiliary scraper structures, and the auxiliary scraper structures are provided in plurality and evenly distributed along the circumference of the scraper disc, and the number of the auxiliary scraper structures is the same as the number of the main scraper grooves; The auxiliary scraping structure includes a follower scraping fork and a reset torsion spring, the follower scraping fork is hinged on the side of the scraping plate, the follower scraping fork includes a pressure follower part and an auxiliary scraping part, the pressure follower part and the auxiliary scraping part are in a V-shaped structure, and the auxiliary scraping part is provided with an auxiliary scraping groove on the side facing the pressure follower part; when the screen rod has not entered the main scraping groove, in the projection parallel to the axis of the scraping plate, the pressure follower part overlaps with the main scraping groove, which is a waiting-to-enter state; when the screen rod is located in the main scraping groove, the screen rod is located in the auxiliary scraping groove of the follower scraping fork corresponding to the main scraping groove, and in the projection parallel to the axis of the scraping plate, the auxiliary scraping part surrounds the screen rod at the opening side of the main scraping groove; The return torsion spring is used for urging the follower soil scraping fork to remain in the waiting state when no external force acts.

8. The anti-soil sweet potato harvester according to claim 1, characterized in that: The scraping drive mechanism comprises a 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 scraping disc.

9. The anti-soil sweet potato harvester according to claim 1, characterized in that: The soil scraping driving mechanism comprises an electric push rod, a shell of which is fixedly connected to a corresponding synchronous wheel, and a telescopic rod of which is fixedly connected to a soil scraping disc.

10. A method for harvesting sweet potatoes with an anti-mounding soil-retaining sweet potato harvester according to any one of claims 1 to 9, characterized in that: The following steps are involved: Towing by tractor; The sweet potatoes and soil are loosened and dug up by the digging mechanism. As the tractor moves forward, the sweet potato and soil mixture is piled up and squeezed together, and moves backwards to the conveying separation screen, and then the conveying separation screen takes over the sweet potato and soil mixture and transports it backwards; During the transportation, the larger sweet potatoes stay on the screen bars of the conveying separation screen, while the smaller soil and other impurities fall back to the ground through the gaps between the screen bars; When the screen bar moves to the outside of the synchronous wheel of the conveying and separation drive mechanism, it will enter the main scraping groove corresponding to the scraping plate. At this time, the scraping plate and the screen bar rotate forward synchronously; when the screen bar changes direction, it comes out of the main scraping groove and moves away from the scraping plate to move in a cycle; The thickness detection module measures the thickness of the soil on the screen rod in real time. When the thickness of the soil is greater than the upper limit of the cleaning threshold, the scraper drive mechanism drives the scraper plate to move laterally, and the screen rod in the main scraper trough is scraped laterally to remove the soil adhering to the screen rod; the above-mentioned scraping operation is performed until the detected soil thickness is less than the lower limit of the cleaning threshold.

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