Part sorting device based on machine vision
The parts sorting device, which combines machine vision and sensors, solves the problems of stable positioning and friction damage of parts on the conveyor belt, and realizes continuous sorting and protection of parts.
Patent Information
- Application Number
- CN202520073217.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Existing parts sorting systems cannot ensure that parts are stably positioned on the conveyor belt, resulting in the ejection mechanism failing to eject parts completely, and the conveyor belt deforming and friction damaging parts, especially fragile parts.
Design a machine vision-based parts sorting device, which employs a transfer mechanism, auxiliary frame, industrial camera, feeding frame, discharging frame and control box. Multiple transfer frames and motors drive the rotating plate to rotate, so that parts are sequentially identified by the industrial camera. Infrared sensors and guide frames are used to ensure accurate delivery and placement of parts, avoiding friction damage.
It enables continuous sorting of parts, improves sorting efficiency, and ensures that parts are not damaged during the sorting process, especially protecting fragile parts.
Smart Images
Figure CN223819147U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of parts sorting technology, and in particular relates to a parts sorting device based on machine vision. Background Technology
[0002] In modern industrial production, parts sorting is a crucial step. It involves separating different types of parts from a mixed state and sending them to designated storage or processing locations according to certain rules or requirements. To achieve this process, various parts sorting systems and technologies have been developed.
[0003] Currently, a common parts sorting system transports parts via a single conveyor belt. This system typically features a long, narrow conveyor belt on which parts are placed and moved forward. Along the conveyor belt, multiple industrial cameras are positioned to capture and identify the passing parts. When a part moves to the position of the corresponding camera, the system, based on the camera's recognition result, uses a pushing mechanism (such as a cylinder or electromagnet) to push the part off the conveyor belt, causing it to fall into a pre-set storage location or sorting bin, thus achieving parts sorting.
[0004] However, this existing parts sorting system has some obvious drawbacks: First, during the transport process via conveyor belt, it cannot be ensured that the parts are in the middle of the conveyor belt, which may cause the ejection mechanism to fail to eject the parts completely; second, because the conveyor belt is soft, it is prone to deformation when the pusher mechanism pushes the parts out, which may cause the parts to fail to move in the intended direction; in addition, during the process of the pusher mechanism pushing the parts off the conveyor belt, the parts may be damaged to some extent due to the thrust and friction between the parts and the conveyor belt, which may be unacceptable, especially for some parts with sensitive or fragile surfaces.
[0005] Therefore, it is essential to invent a parts sorting device based on machine vision. Utility Model Content
[0006] The purpose of this invention is to provide a machine vision-based parts sorting device to solve the problems mentioned in the background art.
[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0008] This utility model relates to a parts sorting device based on machine vision, comprising a transfer mechanism, auxiliary frames, industrial cameras, a feeding rack, a discharging rack, and a control box. Several auxiliary frames are fixed to the upper side of the transfer mechanism, and an industrial camera is bolted to the upper end of each auxiliary frame. A single feeding rack and several discharging racks are respectively arranged on the outer side of the transfer mechanism, with the number of discharging racks corresponding to the number of industrial cameras. The control box is fixed to the transfer mechanism by bolts, and a controller, an image comparison module, and a storage module are fixed inside the control box. The controller is electrically connected to the industrial cameras, the image comparison module, and the storage module via data cables.
[0009] Further, the transfer mechanism includes a workbench, first support legs, a bearing column, a rotating plate, a first motor, transfer frames, and sleeves. Several first support legs are bolted to the lower side of the workbench, and a bearing column is bolted to the upper middle part of the workbench. A sleeve is rotatably mounted on the outer side of the bearing column via a support bearing. A rotating plate is welded to the upper outer side of the sleeve, and the middle outer side of the sleeve is connected to the output end of the first motor via a gear set. The base of the first motor is bolted to the workbench. Several transfer frames are evenly bolted to the upper side of the rotating plate, wherein the number of transfer frames... The number of industrial cameras is the same, and the transfer racks are all located below the lenses of the industrial cameras. The upper side of the supporting column is fixed with an auxiliary frame and a control box by bolts. The first motor and the transfer rack are electrically connected to the controller inside the control box via data cables. One end of the feeding rack is set on the transfer rack, and one end of the discharging rack is set between the worktable and the rotating plate. This arrangement can carry the parts transported by the feeding rack, allowing them to pass through different industrial cameras in sequence until they move to the underside of a specific industrial camera, where the parts are discharged onto the corresponding discharging rack. Furthermore, since multiple transfer racks are provided, continuous sorting can be achieved.
[0010] Furthermore, the transfer frame includes a first frame, a first rotating column, a first conveyor belt, and a second motor. The first frame is fixed to the side of the rotating plate with bolts, and at least two rotating columns are rotatably installed inside the first frame, wherein the outer side of the first rotating column is wrapped with the first conveyor belt. The outer side of the first frame is fixed to the second motor with bolts, wherein the output end of the second motor is fixed to one of the first rotating columns, and the second motor is electrically connected to the controller inside the control box via a data cable. This arrangement facilitates the carrying and unloading of parts, and secondly, it does not cause wear to the parts when unloading them.
[0011] Furthermore, the feeding rack includes a second frame, second support legs, second rotating columns, a third motor, a second conveyor belt, a guide frame, and an infrared sensor. Several second support legs are bolted to the lower side of the second frame, and one end of the second frame is positioned on the upper side of the transfer frame. Several second rotating columns are rotatably mounted inside the second frame via support bearings, with the outer surface of each second rotating column encasing the second conveyor belt. A third motor is bolted to the outer surface of the second frame, with its output end fixed to one of the second rotating columns. A guide frame is positioned on the upper middle section of the second conveyor belt, and this guide frame is bolted to the second frame. An infrared sensor is bolted to the end of the second frame near the transfer frame, and the infrared sensor is positioned on the upper side of the second conveyor belt. Both the third motor and the infrared sensor are electrically connected to a controller inside the control box via data cables. This configuration enables the transport of parts to the transfer frame.
[0012] Furthermore, the guide frame includes a top plate, a third rotating column, a fourth rotating column, and a traction belt. The top plate is fixed to the second frame with bolts, and several third rotating columns and several fourth rotating columns are rotatably mounted on the lower side of the top plate through support bearings. The outer sides of the third rotating columns and fourth rotating columns are all wrapped with traction belts. Two fourth motors are fixed to the upper side of the top plate with bolts. The output ends of the fourth motors are fixed to the corresponding third rotating columns and fourth rotating columns, and the fourth motors are electrically connected to the controller inside the control box through data cables. This arrangement can push the moving parts on the second conveyor belt to the middle of the second conveyor belt.
[0013] Furthermore, the discharge rack includes a third frame, third support legs, a fifth rotating column, a third conveyor belt, and a fifth motor. Several third support legs are bolted to the lower side of the third frame, and one end of the third frame is positioned between the rotating plate and the worktable. Several fifth rotating columns are rotatably mounted inside the third frame via support bearings, and a fifth motor is bolted to the outer side of the third frame. The output end of the fifth motor is fixed to one of the fifth rotating columns. The outer side of the fifth rotating column is wrapped with a third conveyor belt. This arrangement allows for the carrying and discharge of parts discharged from the transfer rack.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. This utility model uses a feeding rack to transport parts to a transfer rack on a transfer mechanism. A first motor drives a rotating plate to rotate, causing the parts on the transfer rack to pass through different industrial cameras in sequence. During the pause at each industrial camera position, the part type is accurately identified through the close cooperation of the industrial camera, image comparison module, and storage module. Once a part is identified, the transfer rack moves it to the corresponding discharge rack for discharge, thereby realizing the sorting of parts. In particular, since multiple transfer racks are set up, when a transfer rack stops at an industrial camera position, the other transfer racks can continue to carry parts on the feeding rack, ensuring the continuity of the sorting process and greatly improving sorting efficiency.
[0016] 2. The transfer frame of this utility model is designed so that when parts need to be discharged, the first conveyor belt is driven to rotate by the cooperation of the second motor and the first rotating column, so as to achieve smooth discharge of parts. This design makes the parts almost frictionless with the first conveyor belt, effectively avoiding the problem of parts being damaged by friction during the sorting process, and ensuring the quality and integrity of the parts.
[0017] 3. The feeding rack of this utility model can move parts onto the transfer rack. Secondly, the infrared sensor can detect in real time whether the parts are discharged on the second conveyor belt and send the signal to the controller. The controller shuts down the third motor in a timely manner according to the received signal, and ensures that the third motor is restarted when the rotating plate stops again, thereby accurately controlling the conveying and placement of the parts. In addition, the guide frame can push the parts on the second conveyor belt to the middle of the second conveyor belt, thereby ensuring that the parts can fall accurately onto the transfer rack. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the structure of this utility model.
[0020] Figure 2 This is a schematic diagram of the transfer mechanism of this utility model.
[0021] Figure 3 This is a schematic diagram of the structure of the rotating plate, the first motor, and the sleeve of this utility model.
[0022] Figure 4 This is a structural schematic diagram of the transfer frame of this utility model.
[0023] Figure 5This is a structural schematic diagram of the feed rack of this utility model.
[0024] Figure 6 This is a structural schematic diagram of the guide frame of this utility model.
[0025] Figure 7 This is a structural schematic diagram of the material rack of this utility model.
[0026] In the picture:
[0027] 1-Transfer mechanism, 11-Workbench, 12-First support leg, 13-Bearing column, 14-Rotating plate, 15-First motor, 16-Transfer frame, 161-First frame, 162-First rotating column, 163-First conveyor belt, 164-Second motor, 17-Sleeve, 2-Auxiliary frame, 3-Industrial camera, 4-Feeding frame, 41-Second frame, 42-Second support leg, 43-Second rotating column, 44-Third motor, 45-Second conveyor belt, 46-Guide frame, 461-Top plate, 462-Third rotating column, 463-Fourth rotating column, 464-Traction belt, 47-Infrared sensor, 5-Discharge frame, 51-Third frame, 52-Third support leg, 53-Fifth rotating column, 54-Third conveyor belt, 55-Fifth motor, 6-Control box. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0029] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0030] Please see Figures 1 to 7As shown, this utility model is a parts sorting device based on machine vision, including a transfer mechanism 1, auxiliary frames 2, industrial cameras 3, feeding racks 4, discharging racks 5, and a control box 6. Several auxiliary frames 2 are fixed on the upper side of the transfer mechanism 1, and the upper end of each auxiliary frame 2 is fixed with an industrial camera 3 by bolts. A single feeding rack 4 and several discharging racks 5 are respectively arranged on the outside of the transfer mechanism 1, wherein the number of discharging racks 5 is adapted to the number of industrial cameras 3. The control box 6 is fixed to the transfer mechanism 1 by bolts, and a controller, an image comparison module, and a storage module are fixed inside the control box 6. The controller is electrically connected to the industrial cameras 3, the image comparison module, and the storage module through data cables.
[0031] Specifically, the transfer mechanism 1 includes a workbench 11, first support legs 12, bearing columns 13, a rotating plate 14, a first motor 15, transfer frames 16, and sleeves 17. Several first support legs 12 are bolted to the lower side of the workbench 11, and bearing columns 13 are bolted to the upper middle part of the workbench 11. Sleeves 17 are rotatably mounted on the outer side of the bearing columns 13 via support bearings. The rotating plate 14 is welded to the upper outer side of the sleeve 17, and the middle outer side of the sleeve 17 is connected to the output end of the first motor 15 via a gear set. The base of the first motor 15 is bolted to the workbench 11. Several transfer frames 16 are evenly bolted to the upper side of the rotating plate 14, the number of transfer frames 16 being the same as the number of industrial cameras 3, and all transfer frames 16 are located below the lenses of the industrial cameras 3. The upper sides of the bearing columns 13 are respectively bolted to... There is an auxiliary frame 2 and a control box 6; the first motor 15 and the transfer frame 16 are electrically connected to the controller inside the control box 6 via data cables; one end of the feeding frame 4 is set on the transfer frame 16, and one end of the discharging frame 5 is set between the workbench 11 and the rotating plate 14. When in use, the parts transported by the feeding frame 4 can fall onto the corresponding transfer frame 16, and then the first motor 15 drives the rotating plate 14 to rotate, so that the parts on the transfer frame 16 pass through different industrial cameras 3 in sequence and stop at the position of the industrial camera 3 until they move to the underside of a specific industrial camera 3. At this time, the transfer frame 16 can carry the parts to the corresponding discharging frame 5. In addition, since there are multiple transfer frames 16, when the transfer frame 16 stops at different positions of the industrial camera 3, the parts on the feeding frame 4 can be carried by the other transfer frames 16, thereby realizing continuous sorting.
[0032] Specifically, the transfer frame 16 includes a first frame 161, a first rotating column 162, a first conveyor belt 163, and a second motor 164. The first frame 161 is fixed to the upper side of the rotating plate 14 by bolts, and at least two rotating columns 162 are rotatably installed inside the first frame 161. The outer side of the first rotating column 162 is wrapped with the first conveyor belt 163. The outer side of the first frame 161 is fixed with bolts to the second motor 164, and the output end of the second motor 164 is fixed to one of the first rotating columns 162. The second motor 164 is electrically connected to the controller inside the control box 6 through a data cable. In use, the first conveyor belt 163 can carry the parts discharged from the feed rack 4 under the tension of the first rotating column 162. When it is necessary to discharge the parts, the second motor 164 can drive the first rotating column 162 to rotate, thereby driving the first conveyor belt 163 to rotate, and then discharge the parts.
[0033] Specifically, the feeding rack 4 includes a second frame 41, second support legs 42, second rotating columns 43, a third motor 44, a second conveyor belt 45, a guide frame 46, and an infrared sensor 47. Several second support legs 42 are bolted to the lower side of the second frame 41, and one end of the second frame 41 is positioned on the upper side of the transfer frame 16. Several second rotating columns 43 are rotatably mounted inside the second frame 41 via support bearings, and the outer side of each second rotating column 43 is wrapped with the second conveyor belt 45. The third motor 44 is bolted to the outer side of the second frame 41, and the output end of the third motor 44 is fixed to one of the second rotating columns 43. A guide frame 46 is positioned on the upper middle side of the second conveyor belt 45, and the guide frame 46 is bolted to the second frame 41. An infrared sensor 47 is bolted to the end of the second frame 41 near the transfer frame 16. The infrared sensor 47 is located on the upper side of the second conveyor belt 45. The third motor 44 and the infrared sensor 47 are electrically connected to the controller inside the control box 6 via data cables. In use, the parts can be placed on the second conveyor belt 45 at one end of the second frame 41. Then, the parts are moved to the transfer frame 16 by the cooperation of the third motor 44, the second rotating column 43 and the second conveyor belt 45. The infrared sensor 47 can determine whether the parts are discharged on the second conveyor belt 45 and then send a signal to the controller. The controller shuts down the third motor 44 and restarts the third motor 44 when the rotating plate 14 stops again. In addition, the guide frame 46 can push the parts on the second conveyor belt 45 to the middle of the second conveyor belt 45 to ensure that the parts can fall accurately onto the transfer frame 16.
[0034] Specifically, the guide frame 46 includes a top plate 461, a third rotating column 462, a fourth rotating column 463, and a traction belt 464. The top plate 461 is fixed to the second frame 41 by bolts, and several third rotating columns 462 and several fourth rotating columns 463 are rotatably mounted on the lower side of the top plate 461 through support bearings. The outer sides of the third rotating columns 462 and the fourth rotating columns 463 are all wrapped with the traction belt 464. Two fourth motors are fixed to the upper side of the top plate 461 by bolts. The output ends of the fourth motors are fixed to the corresponding third rotating columns 462 and the fourth rotating columns 463, and the fourth motors are electrically connected to the controller inside the control box 6 through data cables. In use, the fourth motors can drive the traction belt 464 to rotate through the third rotating columns 462 and the fourth rotating columns 463, thereby pushing the moving parts on the second conveyor belt 45 to the middle of the second conveyor belt 45 through the two traction belts 464.
[0035] Specifically, the discharge rack 5 includes a third frame 51, third support legs 52, fifth rotating columns 53, a third conveyor belt 54, and a fifth motor 55. Several third support legs 52 are fixed to the lower side of the third frame 51 by bolts, and one end of the third frame 51 is located between the rotating plate 14 and the worktable 11. Several fifth rotating columns 53 are rotatably mounted inside the third frame 51 through support bearings, and a fifth motor 55 is fixed to the outer side of the third frame 51 by bolts. The output end of the fifth motor 55 is fixed to one of the fifth rotating columns 53. The outer side of the fifth rotating column 53 is wrapped with a third conveyor belt 54. In use, the third conveyor belt 54 can carry the parts discharged from the transfer rack 16, and then discharge the parts with the cooperation of the fifth motor 55 and the fifth rotating column 53.
[0036] Please see Figure 1-7 As shown, this utility model is a parts sorting device based on machine vision. Its working principle is as follows: When in use, the parts to be sorted are first transported to the transfer frame 16 inside the transfer mechanism 1 through the feeding frame 4. Then, the first motor 15 drives the rotating plate 14 to rotate, so that the parts on the transfer frame 16 pass through different industrial cameras 3 in sequence and stop at the position of the industrial camera 3. At this time, the industrial camera 3 can take pictures of the parts and transmit them to the controller. The controller identifies the type of the parts through the cooperation of the image comparison module and the storage module until it moves to the underside of a specific industrial camera 3. At this time, the transfer frame 16 can move the parts to the corresponding discharge frame 5 and discharge them through the discharge frame 5. In addition, since multiple transfer frames 16 are set, when the transfer frame 16 stops at different positions of the industrial camera 3, the parts on the feeding frame 4 can be carried by the remaining transfer frames 16, thereby realizing continuous sorting.
[0037] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," 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 the present invention. 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.
[0038] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A machine vision-based parts sorting device, comprising a transfer mechanism (1), an auxiliary frame (2), an industrial camera (3), a feeding frame (4), a discharging frame (5), and a control box (6), characterized in that: The upper side of the transfer mechanism (1) is fixed with several auxiliary frames (2), and an industrial camera (3) is fixed at the upper end of each auxiliary frame (2); a single feeding frame (4) and several discharging frames (5) are respectively set on the outside of the transfer mechanism (1), and the number of discharging frames (5) is adapted to the number of industrial cameras (3); the control box (6) is fixed to the transfer mechanism (1), and a controller, an image comparison module and a storage module are respectively fixed inside the control box (6). The controller is electrically connected to the industrial camera (3), the image comparison module and the storage module through data cables.
2. The machine vision-based parts sorting device as described in claim 1, characterized in that: The transfer mechanism (1) includes a workbench (11), first support legs (12), a bearing column (13), a rotating plate (14), a first motor (15), a transfer frame (16), and a sleeve (17). Several first support legs (12) are fixed to the lower side of the workbench (11), and a bearing column (13) is fixed to the upper middle side of the workbench (11). A sleeve (17) is rotatably mounted on the outer side of the bearing column (13), wherein a rotating plate (14) is fixed to the upper outer side of the sleeve (17), and the middle outer side of the sleeve (17) is connected to the output end of the first motor (15) via a gear set. The first motor (15) has a... The seat is fixed to the workbench (11); several transfer frames (16) are evenly fixed on the upper side of the rotating plate (14), wherein the number of transfer frames (16) is the same as the number of industrial cameras (3), and the transfer frames (16) are all set on the lower side of the lens of the industrial camera (3); the upper side of the supporting column (13) is fixed with an auxiliary frame (2) and a control box (6); the first motor (15) and the transfer frames (16) are electrically connected to the controller inside the control box (6) through data lines; one end of the feeding rack (4) is set on the transfer frame (16), and one end of the discharging rack (5) is set between the workbench (11) and the rotating plate (14).
3. The machine vision-based parts sorting device as described in claim 2, characterized in that: The transfer frame (16) includes a first frame (161), a first rotating column (162), a first conveyor belt (163), and a second motor (164). The first frame (161) is fixed on the upper side of the rotating plate (14), and at least two rotating columns (162) are rotatably installed inside the first frame (161). The outer side of the first rotating column (162) is wrapped with the first conveyor belt (163). The outer side of the first frame (161) is fixed with the second motor (164), and the output end of the second motor (164) is fixed to one of the first rotating columns (162). The second motor (164) is electrically connected to the controller inside the control box (6) through a data cable.
4. A parts sorting device based on machine vision as described in claim 2, characterized in that: The feeding rack (4) includes a second frame (41), second support legs (42), second rotating columns (43), a third motor (44), a second conveyor belt (45), a guide frame (46), and an infrared sensor (47). Several second support legs (42) are fixed to the lower side of the second frame (41), and one end of the second frame (41) is positioned on the upper side of the transfer frame (16). Several second rotating columns (43) are rotatably mounted inside the second frame (41), and the outer side of the second rotating columns (43) is wrapped with the second conveyor belt (45). The outer side of the second frame (41)... A third motor (44) is fixed, wherein the output end of the third motor (44) is fixed to one of the second rotating columns (43); a guide frame (46) is provided on the upper side of the middle part of the second conveyor belt (45), wherein the guide frame (46) is fixed to the second frame (41); an infrared sensor (47) is fixed on one end of the second frame (41) near the transfer frame (16), wherein the infrared sensor (47) is located on the upper side of the second conveyor belt (45); the third motor (44) and the infrared sensor (47) are both electrically connected to the controller inside the control box (6) through a data cable.
5. A parts sorting device based on machine vision as described in claim 4, characterized in that: The guide frame (46) includes a top plate (461), a third rotating column (462), a fourth rotating column (463), and a traction belt (464). The top plate (461) is fixed to the second frame (41), and a number of third rotating columns (462) and a number of fourth rotating columns (463) are rotatably mounted on the lower side of the top plate (461). The outer sides of the third rotating columns (462) and the fourth rotating columns (463) are all wrapped with traction belts (464). Two fourth motors are fixed on the upper side of the top plate (461), and the output ends of the fourth motors are fixed to the corresponding third rotating columns (462) and fourth rotating columns (463). The fourth motors are electrically connected to the controller inside the control box (6) via data lines.
6. A parts sorting device based on machine vision as described in claim 2, characterized in that: The material discharge rack (5) includes a third frame (51), a third support leg (52), a fifth rotating column (53), a third conveyor belt (54), and a fifth motor (55). Several third support legs (52) are fixed on the lower side of the third frame (51), and one end of the third frame (51) is located between the rotating plate (14) and the workbench (11). Several fifth rotating columns (53) are rotatably installed inside the third frame (51), and a fifth motor (55) is fixed on the outer side of the third frame (51). The output end of the fifth motor (55) is fixed to one of the fifth rotating columns (53). The outer side of the fifth rotating column (53) is wrapped with a third conveyor belt (54).