An automatic system for picking and classifying winter jujubes

Abstract

The present disclosure provides a winter jujube picking and classifying automation system, relating to the technical field of winter jujube picking and classifying, comprising a collecting assembly, a cleaning assembly and a sorting assembly, the collecting assembly comprises a sleeve and a ring groove, a supporting assembly is installed on the ring groove, the supporting assembly comprises a cylinder and a support rod, a jujube receiving assembly is installed on the support rod, the jujube receiving assembly comprises a round cloth and a zipper; the cleaning assembly comprises a wind pipe and a bend pipe, a ventilation assembly is installed on the wind pipe, the ventilation assembly comprises a fan and a filter screen, the winter jujube picking and classifying automation system utilizes a blowing pipe to rapidly blow air through a blowing port to the round cloth, so that branches and leaves are blown to the outside of the round cloth, winter jujubes fall into the inside of the sleeve through the blowing port under the action of gravity, meanwhile, the round cover is utilized to avoid the branches and leaves directly falling into the inside of the sleeve, which can effectively separate the branches and leaves and other impurities, guarantee the cleanliness of the picked winter jujubes, and is suitable for picking and collecting winter jujubes and automatic sorting.

Description

Technical Field

[0001] This disclosure relates to the technical field of winter jujube picking and sorting equipment, and in particular to an automated system for winter jujube picking and sorting. Background Technology

[0002] In order to improve the efficiency of winter jujube harvesting and reduce manpower consumption, it is often necessary to use winter jujube harvesting and sorting equipment.

[0003] Patent application CN202110192921.2 discloses an automated jujube picking and sorting device. Operators can pre-adjust the distance between the squeezing device and the outer perimeter of the guide cover. Jujubes then enter the area; smaller jujubes fall directly through the gaps, while larger ones remain in the area. However, some smaller jujubes may pile up and be difficult to fall. In this case, the gripping device, guided by a cylinder, effectively grips the remaining jujubes. A hydraulic rod controls the guide cover to descend slightly. The squeezing device maintains the same distance from the guide cover at all times. During the gripping process, smaller jujubes fall continuously, while the remaining larger jujubes are handled by the hydraulic rod lowering the guide cover. As the guide cover descends, the holes at its top open, allowing the squeezing device to pass through. The pressing device extends, effectively pushing the surrounding jujubes into the holes, thus completing the simple sorting of the jujubes. The entire operation process is simple, convenient, and effective. The invention patent with patent application number CN201810764465.2 discloses an integrated machine for harvesting and grading jujubes, which combines hand-held picking and shaking picking methods. The two picking methods complement each other, ensuring that the jujubes are picked cleanly and thoroughly, maximizing efficiency. The gripper is designed with a fitting curve to ensure that the gripper and the trunk have a strong surface contact, reducing damage to the jujube tree trunk. The rocker arm motor is equipped with a single-chip microcomputer-controlled drive device, which can adjust the speed of the rocker arm, thereby changing the shaking frequency according to the different thicknesses of the trunk, realizing the integration of picking, collecting, and grading. It is fully functional, can shorten the labor process, liberate labor, reduce labor intensity, and is highly efficient and fast.

[0004] According to its publicly available technical solutions, existing jujube picking and sorting equipment has several drawbacks. First, when collecting fallen jujubes, it often collects leaves, branches, and other impurities along with them, compromising the cleanliness of the collected jujubes. Second, it cannot automatically grade and sort the collected jujubes, thus affecting their quality. Third, during collection, the base of the jujube tree is not completely covered due to the influence of the tree trunk, causing jujubes to fall outside the collection equipment, which is detrimental to the safety of jujube picking. Summary of the Invention

[0005] This disclosure aims to at least partially address one of the technical problems in the related art.

[0006] Therefore, the purpose of this disclosure is to provide an automated system for harvesting and classifying winter jujubes.

[0007] To achieve the above objectives, an automated system for harvesting and sorting winter jujubes includes: a collection component, a cleaning component, and a sorting component. The collection component includes a support sleeve and an annular groove. A support component is installed on the annular groove. The support component includes a cylinder and a strut. A jujube-receiving component is installed on the strut. The jujube-receiving component includes a circular cloth and a zipper. The cleaning component includes a duct and a curved pipe. A ventilation component is installed on the duct. The ventilation component includes a fan and a filter screen. A rotating component is installed on the curved pipe. The rotating component includes a blowpipe and a fan blade. A shielding component is installed on the blowpipe. The shielding component includes a circular cover and a blowout. The sorting component includes a box and support legs. A rolling component is installed on the box. The rolling component includes a central rod and a spiral plate. A discharge component is installed on the box. The discharge component includes a guide plate and a side opening.

[0008] Optionally, the annular groove is integrally formed on the top of the support sleeve, the outer side of the cylinder is clamped on the inner wall of the annular groove, the diameter of the cylinder is larger than the width of the top of the annular groove, and one end of the support rod is welded to the cylinder.

[0009] Optionally, a support sleeve is provided on the outer side of the support sleeve, the bottom end of the support sleeve is threaded onto the outer side of the support sleeve, the top end of the support sleeve is located at the top of the outer side of the annular groove, and the top end of the support sleeve is supported on the bottom of the support rod.

[0010] Optionally, the circular fabric is bonded to the top of the support rod, the inner side of the circular fabric extends to the inner side of the support sleeve, the zipper is sewn onto the circular fabric, the circular fabric is connected end to end by the zipper, and both ends of the zipper are equipped with zippers.

[0011] Optionally, the air duct is bolted to the outside of the support sleeve, the filter screen is bolted to one end of the air duct, and the fan is bolted to the inside of the air duct.

[0012] Optionally, the bend is welded to the inside of the support sleeve, the top end of the bend is located at the center of the support sleeve, the bottom end of the bend passes through the inner wall of the support sleeve and is connected to the other end of the air duct, and the bottom end of the blowpipe is mounted on the top of the bend through a bearing.

[0013] Optionally, the bottom of the dome is close to the top of the round cloth, the bottom of the dome is welded to the blowpipe via a connecting rod, the fan blade is welded to the inside of the blowpipe, and the top of the blowpipe extends to the top of the round cloth.

[0014] Optionally, the nozzle is located on one side of the circular cover, and the top of the blowpipe is located inside the nozzle.

[0015] Optionally, the bottom end of the support sleeve is welded to the top of the box, the support leg is welded to the bottom of the box, the support sleeve is connected to the top of one side of the box, the central rod is welded to the center of the box, the outer side of the spiral plate is welded to the inner wall of the box, the inner side of the spiral plate is welded to the outer side of the central rod, the height of the outer side of the spiral plate is higher than the height of the inner side of the spiral plate, and the spiral plate is spirally coiled around the inner side of the box.

[0016] Optionally, the inner side of the guide plate is welded to the outer side of the box body, the side opening is opened on the box body, the bottom of the side opening is at the same height as the top of the spiral plate, the guide plate is welded to the outer side of the side opening, the bottom height of the outer side of the guide plate is less than the bottom height of the inner side of the guide plate, the bottom of the box body is provided with a bottom opening, the bottom end of the spiral plate is welded with a bottom plate, the bottom plate passes through the bottom opening and extends to the outer side of the box body, and the bottom plate is welded to the outer side of the bottom end of the spiral plate.

[0017] The technical solution provided in this disclosure may include the following beneficial effects: During operation, the blower is turned on, and the air is filtered through the filter screen and then blown into the inside of the curved pipe through the blower tube. The airflow then flows into the inside of the blower tube, where it blows the fan blades, causing the blower tube to rotate. This rotation, via a connecting rod, causes the circular cover to rotate on top of the circular cloth. The blower tube then blows the airflow quickly onto the circular cloth through the nozzle, causing the branches and leaves that have fallen onto the cloth to be blown to the outside of the cloth. Under the influence of gravity, the jujubes roll towards the center of the cloth and enter the inside of the support sleeve through the nozzle. At the same time, the circular cover prevents the branches and leaves from falling directly into the inside of the support sleeve, effectively separating impurities such as branches and leaves and ensuring the cleanliness of the harvested jujubes.

[0018] The jujubes fall through the support sleeves onto the top of the spiral plate inside the box, and then spiral down. The rounder the jujubes, the faster they roll, resulting in a centrifugal force that exceeds the gravitational force due to the spiral plate's angle. This causes the rounder jujubes to pass through the side opening and into the inner side of the guide plate, then roll downwards. Jujubes of lower quality roll slower, and their centrifugal force is less effective at overcoming the gravitational force due to the spiral plate's angle. These jujubes roll downwards on the outer edge of the spiral plate and then outwards through the bottom opening. Damaged jujubes, broken jujubes, and densely packed small branches slide down the inner side of the spiral plate and fall to the bottom of the box near the central rod. This process effectively sorts and grades the jujubes, ensuring their quality.

[0019] In use, transport the box to the base of the jujube tree where the material is needed. Then, pull both ends of the round cloth towards the sides of the jujube tree trunk. The round cloth drives the support rod, which rotates and moves under the limit of the cylinder in the annular groove until both ends of the round cloth are rotated to the sides of the jujube tree trunk. Then, connect the zippers together with zippers until the two zippers drive the zippers to completely wrap the trunk. At the same time, the unfolded area of ​​the round cloth is greater than the vertical projection area of ​​the jujube tree. Then, move to the support sleeve. The support sleeve moves upward on the outside of the support sleeve through the screw thread, causing the support sleeve to drive the support rod to rotate upward, and making the top of the round cloth close to the bottom of the round cover. The outer side of the round cloth is raised upward, which facilitates the collection of winter jujubes. Then, knock or vibrate the winter jujubes to fall completely onto the round cloth, which can effectively cover the base of the jujube tree completely, preventing the winter jujubes from falling to the ground and ensuring the safety of harvesting the winter jujubes.

[0020] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the structure of an automated system for harvesting and sorting winter jujubes according to an embodiment of this disclosure. Figure 1 ; Figure 2 This is a schematic diagram of the structure of an automated system for harvesting and sorting winter jujubes according to an embodiment of this disclosure. Figure 2 ; Figure 3 This is a schematic diagram of the structure of an automated system for harvesting and sorting winter jujubes according to an embodiment of this disclosure. Figure 3 ; Figure 4 This is a schematic diagram of the structure of an automated system for harvesting and sorting winter jujubes according to an embodiment of this disclosure. Figure 4 ; Figure 5 This is a cutaway schematic diagram of the housing of an automated jujube harvesting and sorting system according to an embodiment of this disclosure; Figure 6 This is a cutaway schematic diagram of the ventilation duct of an automated jujube picking and sorting system according to an embodiment of this disclosure; Figure 7 This is a cutaway schematic diagram of the support sleeve of the automated jujube picking and sorting system proposed in one embodiment of this disclosure; Figure 8 This is a cutaway schematic diagram of the curved pipe of an automated jujube picking and sorting system according to an embodiment of this disclosure; Figure 9This is a cutaway schematic diagram of the blowpipe of an automated jujube picking and sorting system according to an embodiment of this disclosure; As shown in the figure: 1. Box body; 2. Support leg; 3. Support sleeve; 4. Annular groove; 5. Cylinder; 6. Support rod; 7. Round cloth; 8. Zipper; 9. Support sleeve; 10. Air duct; 11. Filter screen; 12. Fan; 13. Bend; 14. Blowpipe; 15. Fan blade; 16. Round cover; 17. Connecting rod; 18. Blowout; 19. Middle rod; 20. Spiral plate; 21. Guide plate; 22. Side opening; 23. Bottom plate; 24. Bottom opening. Detailed Implementation

[0022] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, an automated system for harvesting and sorting winter jujubes is characterized by comprising: a collection component, a cleaning component, and a sorting component. The collection component includes a support sleeve 3 and an annular groove 4. A support component is installed on the annular groove 4. The support component includes a cylinder 5 and a strut 6. A jujube-receiving component is installed on the strut 6. The jujube-receiving component includes a circular cloth 7 and a zipper 8. The cleaning component includes a ventilation duct 10 and a curved pipe 13. A ventilation component is installed on the ventilation duct 10. The ventilation component includes a fan 12 and a filter screen 11. A rotating component is installed on the curved pipe 13. The rotating component includes a blowpipe 14 and a fan blade 15. A shielding component is installed on the blowpipe 14. The shielding component includes a circular cover 16 and a blowout 18. The sorting component includes a housing 1 and support legs 2. A rolling component is installed on the housing 1. The device includes a central rod 19 and a spiral plate 20. A discharge assembly is installed on the housing 1, which includes a guide plate 21 and a side opening 22. The annular groove 4 is integrally formed on the top of the support sleeve 3. The outer side of the cylinder 5 is clamped on the inner wall of the annular groove 4. The diameter of the cylinder 5 is larger than the width of the top of the annular groove 4. One end of the support rod 6 is welded to the cylinder 5. A support sleeve 9 is fitted on the outer side of the support sleeve 3. The bottom end of the support sleeve 9 is threaded onto the outer side of the support sleeve 3. The top end of the support sleeve 9 is located at the top of the outer side of the annular groove 4. The top end of the support sleeve 9 is supported on the bottom of the support rod 6. The circular cloth 7 is glued to the top of the support rod 6. The inner side of the circular cloth 7 extends to the inner side of the support sleeve 3. The zipper 8 is sewn onto the circular cloth 7. The circular cloth 7 is connected end to end by the zipper 8. Both ends of the zipper 8 are equipped with zippers.

[0024] Understandably, during use, the box 1 is transported to the bottom of the jujube tree where the material is needed. Then, the two ends of the round cloth 7 are pulled towards the sides of the jujube tree trunk. The round cloth 7 drives the support rod 6, which rotates and moves under the limit of the annular groove 4 via the cylinder 5, until the two ends of the round cloth 7 are rotated to the sides of the jujube tree trunk. Then, the zippers 8 are connected to each other by zippers until the two zippers drive the zippers 8 to completely wrap the trunk. At the same time, the unfolded area of ​​the round cloth 7 is greater than the vertical projection area of ​​the jujube tree. Then, it moves to the support sleeve 9. The support sleeve 9 moves upward on the outside of the support sleeve 3 through the thread, so that the support sleeve 9 drives the support rod 6 to rotate upward and so that the top of the round cloth 7 is close to the bottom of the round cover 16. The outer side of the round cloth 7 is tilted upward to facilitate the collection of winter jujubes. Then, the winter jujubes are knocked down by tapping or vibrating, so that the winter jujubes fall completely onto the round cloth 7, which can effectively cover the bottom of the jujube tree completely, prevent the winter jujubes from falling to the ground, and ensure the safety of harvesting winter jujubes.

[0025] like Figure 7 , Figure 8 and Figure 9As shown, the air duct 10 is bolted to the outside of the support sleeve 3, the filter screen 11 is bolted to one end of the air duct 10, the fan 12 is bolted to the inside of the air duct 10, the bent pipe 13 is welded to the inside of the support sleeve 3, the top end of the bent pipe 13 is located at the center of the support sleeve 3, the bottom end of the bent pipe 13 passes through the inner wall of the support sleeve 3 and is connected to the other end of the air duct 10, the bottom end of the blowpipe 14 is mounted on the top of the bent pipe 13 by a bearing, the bottom of the round cover 16 is close to the top of the round cloth 7, the bottom of the round cover 16 is welded to the blowpipe 14 by a connecting rod 17, the fan blade 15 is welded to the inside of the blowpipe 14, the top end of the blowpipe 14 extends to the top of the round cloth 7, the nozzle 18 is opened on one side of the round cover 16, and the top end of the blowpipe 14 is located inside the nozzle 18.

[0026] Understandably, during operation, when the blower 12 is turned on, the blower 12 filters the air through the filter screen 11, then blows it into the inside of the curved pipe 13 through the blower 10, and then flows to the inside of the blowpipe 14. The airflow blows the fan blades 15 on the inside of the blowpipe 14, causing the blowpipe 14 to rotate. This, in turn, drives the circular cover 16 to rotate on top of the circular cloth 7 via the connecting rod 17. The blowpipe 14 blows the airflow quickly onto the circular cloth 7 through the nozzle 18, causing the branches and leaves that fall onto the circular cloth 7 to be blown to the outside of the circular cloth 7. Under the action of gravity, the jujubes roll towards the center of the circular cloth 7 and enter the inside of the support sleeve 3 through the nozzle 18. At the same time, the circular cover 16 prevents the branches and leaves from falling directly onto the inside of the support sleeve 3, effectively separating the branches, leaves, and other impurities, ensuring the cleanliness of the harvested jujubes.

[0027] like Figure 4 , Figure 5 and Figure 6 As shown, the bottom end of the support sleeve 3 is welded to the top of the housing 1, the support leg 2 is welded to the bottom of the housing 1, the support sleeve 3 is connected to the top of one side of the housing 1, the central rod 19 is welded to the center of the housing 1, the outer side of the spiral plate 20 is welded to the inner wall of the housing 1, the inner side of the spiral plate 20 is welded to the outer side of the central rod 19, the height of the outer side of the spiral plate 20 is higher than the height of the inner side of the spiral plate 20, the spiral plate 20 is spirally coiled around the inner side of the housing 1, and the inner side of the guide plate 21 is welded to... On the outer side of the housing 1, the side opening 22 is formed on the housing 1. The bottom of the side opening 22 is at the same height as the top of the spiral plate 20. The guide plate 21 is welded to the outside of the side opening 22. The bottom height of the outer side of the guide plate 21 is less than the bottom height of the inner side of the guide plate 21. The bottom of the housing 1 is provided with a bottom opening 24. The bottom plate 23 is welded to the bottom end of the spiral plate 20. The bottom plate 23 passes through the bottom opening 24 and extends to the outside of the housing 1. The bottom plate 23 is welded to the outside of the bottom end of the spiral plate 20.

[0028] Understandably, the jujubes fall through the support sleeve 3 onto the top of the spiral plate 20 inside the box 1, and then spiral down along the spiral plate 20. When the jujubes are relatively round, their rolling speed is faster, resulting in a centrifugal force greater than the gravitational force generated by the spiral plate 20's higher outer edge and lower inner edge. Consequently, the rounder jujubes, under the influence of centrifugal force, pass through the side opening 22 and enter the inner side of the guide plate 21, then roll down through the guide plate 21. Jujubes of lower quality roll at a slightly slower speed, resulting in a slower rolling speed. The centrifugal force of the raw material cannot completely overcome the component of gravity generated by the tilt angle on the spiral plate 20. As a result, the jujubes roll downwards on the outer periphery of the spiral plate 20, and then roll outwards through the bottom plate 23 and the bottom opening 24. Damaged jujubes, broken jujubes, and densely packed small branches slide downwards along the inner side of the spiral plate 20 and fall to the bottom of the box 1 near the middle rod 19. This effectively sorts and grades the jujubes, ensuring their quality.

[0029] In the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0030] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An automated system for harvesting and sorting winter jujubes, characterized in that, include: The collection component includes a sleeve (3) and an annular groove (4). A support component is installed on the annular groove (4). The support component includes a cylinder (5) and a strut (6). A tassel-receiving component is installed on the strut (6). The tassel-receiving component includes a round cloth (7) and a zipper (8). The cleaning assembly includes a duct (10) and a bend (13). A ventilation assembly is installed on the duct (10), which includes a fan (12) and a filter (11). A rotating assembly is installed on the bend (13), which includes a blowpipe (14) and a fan blade (15). A shielding assembly is installed on the blowpipe (14), which includes a dome (16) and a nozzle (18). The sorting assembly includes a box (1) and a support leg (2). A rolling assembly is installed on the box (1), which includes a central rod (19) and a spiral plate (20). A discharge assembly is installed on the box (1), which includes a guide plate (21) and a side opening (22).

2. The automated system for harvesting and classifying winter jujubes according to claim 1, characterized in that: The annular groove (4) is integrally formed on the top of the support sleeve (3), the outer side of the cylinder (5) is clamped on the inner wall of the annular groove (4), the diameter of the cylinder (5) is greater than the width of the top of the annular groove (4), and one end of the support rod (6) is welded to the cylinder (5).

3. The automated system for harvesting and classifying winter jujubes according to claim 2, characterized in that: The outer side of the support sleeve (3) is fitted with a support sleeve (9). The bottom end of the support sleeve (9) is threaded onto the outer side of the support sleeve (3). The top end of the support sleeve (9) is located at the top of the outer side of the annular groove (4). The top end of the support sleeve (9) is supported on the bottom of the support rod (6).

4. The automated system for harvesting and classifying winter jujubes according to claim 3, characterized in that: The round cloth (7) is glued to the top of the support rod (6), the inner side of the round cloth (7) extends to the inner side of the support sleeve (3), the zipper (8) is sewn on the round cloth (7), the round cloth (7) is connected end to end by the zipper (8), and both ends of the zipper (8) are equipped with zippers.

5. The automated system for harvesting and classifying winter jujubes according to claim 1, characterized in that: The air duct (10) is bolted to the outside of the support sleeve (3), the filter screen (11) is bolted to one end of the air duct (10), and the fan (12) is bolted to the inside of the air duct (10).

6. The automated system for harvesting and classifying winter jujubes according to claim 5, characterized in that: The bend (13) is welded to the inside of the support sleeve (3). The top of the bend (13) is located at the center of the support sleeve (3). The bottom of the bend (13) passes through the inner wall of the support sleeve (3) and is connected to the other end of the air duct (10). The bottom of the blowpipe (14) is mounted on the top of the bend (13) by a bearing.

7. The automated system for harvesting and classifying winter jujubes according to claim 6, characterized in that: The bottom of the round cover (16) is close to the top of the round cloth (7). The bottom of the round cover (16) is welded to the blowpipe (14) by a connecting rod (17). The fan blade (15) is welded to the inside of the blowpipe (14). The top of the blowpipe (14) extends to the top of the round cloth (7).

8. The automated system for harvesting and classifying winter jujubes according to claim 7, characterized in that: The nozzle (18) is located on one side of the round cover (16), and the top of the blowpipe (14) is located inside the nozzle (18).

9. The automated system for harvesting and classifying winter jujubes according to claim 1, characterized in that: The bottom end of the support sleeve (3) is welded to the top of the box body (1), the support leg (2) is welded to the bottom of the box body (1), the support sleeve (3) is connected to the top of one side of the box body (1), the middle rod (19) is welded to the center of the box body (1), the outer side of the spiral plate (20) is welded to the inner wall of the box body (1), the inner side of the spiral plate (20) is welded to the outer side of the middle rod (19), the height of the outer side of the spiral plate (20) is higher than the height of the inner side of the spiral plate (20), and the spiral plate (20) is spirally coiled around the inner side of the box body (1).

10. The automated system for harvesting and classifying winter jujubes according to claim 9, characterized in that: The inner side of the guide plate (21) is welded to the outer side of the box (1). The side opening (22) is opened on the box (1). The bottom of the side opening (22) is at the same height as the top of the spiral plate (20). The guide plate (21) is welded to the outer side of the side opening (22). The bottom height of the outer side of the guide plate (21) is less than the bottom height of the inner side of the guide plate (21). The bottom of the box (1) is provided with a bottom opening (24). The bottom end of the spiral plate (20) is welded with a bottom plate (23). The bottom plate (23) passes through the bottom opening (24) and extends to the outer side of the box (1). The bottom plate (23) is welded to the outer side of the bottom end of the spiral plate (20).

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