A device for detecting the degree of relaxation of tobacco leaves after bulk conditioning

Abstract

The present application relates to a tobacco loose detection equipment technical field, especially to a kind of tobacco loose after moisture processing degree of detection device of stretching degree.Its technical scheme includes the detection device of checking tobacco, also includes: setting in the detection device in order in turn material taking conveying line, material distributing vibration disc, material conveying line, detection square cover and return material conveying line.The present application is by material taking conveying line, material distributing vibration disc, material conveying line, detection square cover, return material conveying line and industrial camera etc.Structure design, by image recognition technology to the light transmission of tobacco is analyzed, the stretching degree of tobacco is converted into the quantization index of gray value area area ratio, solve the problem of strong subjectivity and poor consistency caused by relying on artificial sense of smell in prior art evaluation.At the same time, it also realizes the automatic extraction, dispersion, image acquisition and material recovery of tobacco sample.The whole detection process does not need manual intervention, significantly improves the detection efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of tobacco leaf looseness testing equipment, and in particular to a device for testing the degree of looseness and expansion of tobacco leaves after rehydration processing. Background Technology

[0002] Loosening and rehydrating tobacco leaves is a technique used in tobacco processing to restore the leaves to appropriate moisture levels, making them more suitable for subsequent processing, storage, and rolling. To ensure the quality and processing performance of the tobacco leaves, their degree of expansion is typically tested after loosening and rehydration. In traditional tobacco processing, the degree of expansion after loosening and rehydration is a key indicator of processing quality. However, current evaluations of tobacco leaf expansion rely primarily on manual sensory judgment, which lacks objectivity, standardization, and efficiency, leading to inconsistent evaluation results, low production efficiency, and difficulty in quantification. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of current methods for evaluating the degree of tobacco leaf expansion, which mainly rely on human experience and sensory judgment, lacking objectivity, standardization, and efficiency, and easily leading to inconsistent evaluation results, low production efficiency, and difficulty in quantification. The invention proposes a device for detecting the degree of tobacco leaf expansion after loosening and rehydration processing.

[0004] The technical solution of the present invention: a detection device for the degree of expansion of tobacco leaves after loosening and rehydration processing, comprising a detection device for inspecting tobacco leaves, and further comprising: a material picking conveyor line, a material distributing vibratory plate, a material conveying conveyor line, a detection square cover, and a return conveyor line arranged sequentially within the detection device, wherein an industrial camera is installed inside the detection square cover; a detection mechanism installed on the material conveying conveyor line to test the humidity of the tobacco leaves; and a U-shaped frame fixedly connected to the material conveying conveyor line, wherein a cylinder is provided on the U-shaped frame to drive the detection mechanism to cover the tobacco leaves on the material conveying conveyor line;

[0005] The detection mechanism includes a lifting hood installed on the material conveying line. A grid plate is fixedly connected inside the lifting hood. A heating tube for heating tobacco leaves on the material conveying line is provided on the lower surface of the grid plate. Multiple air vents are arranged linearly on the grid plate. A dry and wet bulb thermometer aligned with the air vents is fixedly connected to the upper surface of the grid plate.

[0006] Optionally, the piston rod of the cylinder moves through the U-shaped frame and is fixedly connected to the upper surface of the lifting cover, and a pair of U-shaped limiting frames that lock the U-shaped frame are fixedly connected to the upper surface of the lifting cover.

[0007] Optionally, the top two ends of the lifting cover are provided with material inlets, and the inside of each material inlet is covered with a sealing plate, and each sealing plate is provided with multiple screws.

[0008] Optionally, each end of the U-shaped frame near the material conveying line is provided with a pair of fixing holes.

[0009] Optionally, the bottom of the material picking and conveying line is provided with a support cylinder, the material distributing vibrating plate is provided with multiple discharge ports, and a pair of baffles are provided on both sides of the material picking and conveying line and the material conveying line.

[0010] Optionally, the return material conveyor line includes a conveyor belt with multiple partitions on it.

[0011] Optionally, the material conveying line is provided with a bracket at the end away from the material distributing vibratory plate. The top of the bracket is fixedly connected with a plurality of support blocks for supporting the detection square cover. The middle of the bracket is also fixedly connected with a support block for supporting the industrial camera. The material conveying line is provided with a backlight area located directly below the industrial camera.

[0012] Optionally, the bracket has multiple bolt holes at one end near the outer wall of both sides of the material conveying line.

[0013] Optionally, the top of the detection device is rotatably connected to a rotating bracket, and a controller is provided at the end of the rotating bracket away from the detection device. The detection device is also provided with multiple pairs of viewing windows, and multiple universal pulleys are fixedly connected to the bottom of the detection device. The detection device is also provided with mounting grooves for the ends of the material picking conveyor line and the return material conveyor line to detach.

[0014] In summary, this application includes at least one of the following beneficial technical effects:

[0015] This invention, through the design of a material handling conveyor line, a material dispensing vibratory feeder, a material conveying line, a square inspection hood, a return conveyor line, and an industrial camera, analyzes the light transmittance of tobacco leaves using image recognition technology. It converts the leaf's spread into a quantitative indicator of the area ratio of grayscale values, solving the problems of strong subjectivity and poor consistency in evaluation caused by reliance on human sensory judgment in existing technologies. Simultaneously, it achieves automatic extraction, dispersion, image acquisition, and material recovery of tobacco leaves. The entire inspection process requires no manual intervention, significantly improving inspection efficiency and meeting the batch inspection needs of modern tobacco processing production.

[0016] Furthermore, this invention utilizes a combination of a detection mechanism, a U-shaped frame, a cylinder, a heating element, and wet / dry bulb thermometers to perform preliminary inspection before using an industrial camera. This effectively establishes a preliminary quality control checkpoint in the entire inspection process. This checkpoint allows for the control of the overall quality and looseness of the tobacco leaves, enabling the timely detection and resolution of factors that could affect the reliability of the final inspection results (such as severe dampness), leading to abnormal looseness and making accurate judgment impossible through normal inspection procedures. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing is provided according to the present invention.

[0018] Figure 2 for Figure 1 Partial structural diagram;

[0019] Figure 3 for Figure 2 Partial structural diagram;

[0020] Figure 4 for Figure 3 Partial structural diagram;

[0021] Figure 5 for Figure 3 Schematic diagram of the connection structure between the U-shaped frame and the lifting cover;

[0022] Figure 6 for Figure 5 A partial breakdown diagram.

[0023] Reference numerals: 1. Detection device; 11. Universal pulley; 12. Rotating bracket; 13. Controller; 14. Viewing window; 15. Mounting slot; 2. Material handling conveyor line; 21. Support cylinder; 3. Distributing vibratory plate; 31. Discharge port; 4. Material conveyor line; 41. Baffle; 42. Backlight area; 5. Detection square cover; 51. Bracket; 52. Support block; 53. Bolt hole; 54. Support block; 55. Industrial camera; 6. Return material conveyor line; 61. Conveyor belt; 62. Partition plate; 7. U-shaped frame; 71. Fixing hole; 72. Cylinder; 8. Lifting cover; 81. Material handling port; 82. Sealing plate; 83. Screw; 84. Grid plate; 85. Vent hole; 86. Dry and wet bulb thermometer; 87. U-shaped limit frame; 88. Heating tube. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0026] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Example

[0031] like Figures 1 to 6As shown, this invention proposes a detection device for the degree of expansion of loose tobacco leaves after rehydration processing. The device includes a detection unit 1 for inspecting tobacco leaves, and further includes: a material picking conveyor line 2, a material distributing vibratory plate 3, a material conveying conveyor line 4, a detection square cover 5, and a return conveyor line 6, arranged sequentially within the detection unit 1. The bottom of the material picking conveyor line 2 is equipped with a support cylinder 21, and one end of the bottom of the material picking conveyor line 2 is located directly above the material distributing vibratory plate 3, ensuring that all tobacco leaf material on the material picking conveyor line 2 is conveyed into the material distributing vibratory plate 3. The material conveying conveyor line 4, located away from the material distributing vibratory plate 3, is located at the bottom of the return conveyor line 6, ensuring that the tobacco leaf material on the material conveying conveyor line 4 is ultimately discharged onto the return conveyor line 6. A brush device is installed at the end of the material conveyor line 4 away from the material distributing vibratory plate 3 to sweep away residual debris adsorbed on the backlight area 42, ensuring the cleanliness of the backlight area 42 and avoiding interference from debris with subsequent image acquisition. The dispensing vibratory feeder 3 has several discharge ports 31, all located at the top of one end of the conveyor line 4. These ports ensure that the tobacco leaves discharged from the ports 31 fall onto the conveyor line 4. Both the take-up conveyor line 2 and the conveyor line 4 have a pair of baffles 41 on both sides to prevent materials from falling onto either side. The return conveyor line 6 includes a conveyor belt 61 with several baffles 62. These baffles guide the tobacco leaves along a specific direction and path on the conveyor belt, ensuring the materials accurately reach their designated positions. An industrial camera 55 is installed inside the detection square cover 5. Through backlighting and high-resolution imaging by the industrial camera 55, the differences in the translucency of the tobacco leaves can be clearly captured. Combined with image recognition algorithms, the area ratio of grayscale values ​​is accurately calculated. For example, areas with lower grayscale values ​​correspond to parts with more folds, while areas with higher grayscale values ​​correspond to parts with better expansion. Based on this, the present invention can accurately calculate the degree of tobacco leaf unfolding, providing an objective evaluation basis for tobacco leaf processing quality, thereby accurately assessing the degree of tobacco leaf unfolding. Compared with traditional manual inspection, the present invention has higher detection accuracy and consistency; a U-shaped frame 7 is fixedly connected to the material conveying line 4, and a pair of fixing holes 71 are opened at the end of the U-shaped frame 7 near the material conveying line 4. A cylinder 72 is provided on the U-shaped frame 7 to drive the detection mechanism to cover the tobacco leaves on the material conveying line 4. The piston rod of the cylinder 72 moves through the U-shaped frame 7 and is fixedly connected to the upper surface of the lifting cover 8. A pair of U-shaped limiting frames 87 are fixedly connected to the upper surface of the lifting cover 8 to lock the U-shaped frame 7. The U-shaped limiting frames 87 ensure that the lifting cover 8 can move up and down more stably after being locked by the pair of U-shaped limiting frames 87.

[0032] Furthermore, such as Figures 5 to 6As shown, a detection mechanism for testing the moisture content of tobacco leaves is installed on the material conveyor line 4. The detection mechanism includes a lifting hood 8 installed on the material conveyor line 4. The bottom end of the lifting hood 8 has an inclined port to ensure that the inclined port is tightly connected to the baffle 41. Both ends of the top of the lifting hood 8 have material inlets 81, and the inside of each material inlet 81 is covered with a sealing plate 82. Several screws 83 are installed on each sealing plate 82. A grid plate 84 is fixedly connected inside the lifting hood 8. The lower surface of the grid plate 84 has a heating tube 88 for heating the tobacco leaves on the material conveyor line 4. The heating tube 88 works by using the principle of generating heat by current passing through a resistance wire. When current passes through the resistance wire, the resistance wire heats up, converting electrical energy into heat energy, which in turn heats the surrounding tobacco leaves. This causes tobacco leaves with different degrees of looseness to evaporate different amounts of moisture. Multiple air vents 85 are arranged in a linear pattern on the grid plate 84 to ensure that the evaporated water vapor passes through the air vents 85 and is detected by the wet-bulb and dry-bulb thermometers 86. A wet-bulb and dry-bulb thermometer 86, aligned with the vent hole 85, is fixedly connected to the upper surface of the grid plate 84. The wet-bulb and dry-bulb thermometer 86 is an instrument used to measure air humidity. It consists of two thermometers, one dry-bulb and one wet-bulb. These two thermometers are usually mounted on the same bracket and suspended by the same rod. The main function of the wet-bulb and dry-bulb thermometer 86 is to calculate the air humidity by measuring the temperature difference between the dry and wet bulbs.

[0033] Among them, such as Figures 3 to 4 As shown, a bracket 51 is provided on the end of the material conveyor line 4 away from the distributing vibratory feeder 3. Multiple support blocks 52 for supporting the detection square cover 5 are fixedly connected to the top of the bracket 51, and the tops of the support blocks 52 are fixedly connected to the inner wall of the detection square cover 5. A support block 54 for supporting the industrial camera 55 is also fixedly connected to the middle of the bracket 51. A backlight area 42 is provided on the material conveyor line 4 directly below the industrial camera 55. The backlight area 42 works in conjunction with the industrial camera 55 to provide additional lighting behind the object being photographed. Its main function is to highlight the outline or details of the object by providing sufficient illumination, ensuring that the camera can capture the object more clearly and avoiding blurry or unclear images due to insufficient lighting. Several bolt holes 53 are provided on the end of the bracket 51 near the outer walls of both sides of the material conveyor line 4. The detection square cover 5 is for protecting the camera while improving its working efficiency and image quality.

[0034] Furthermore, such as Figure 1As shown, a rotating bracket 12 is rotatably connected to the top of the detection device 1. A controller 13 is located at the end of the rotating bracket 12 furthest from the detection device 1. The controller 13 is the core component of the device, responsible for processing data from the tobacco leaf looseness detection, controlling the device's operation, and providing an operating interface. Typically, these controllers receive tobacco leaf status information through sensors, analyze whether the tobacco leaves are loose, and thus decide whether to take appropriate action or provide feedback. The detection device 1 also has multiple pairs of viewing windows 14. Several universal pulleys 11 are fixedly connected to the bottom of the detection device 1. Universal pulleys 11 are special pulleys designed to rotate freely in multiple directions, typically used to change the direction of ropes or cables, thereby providing more efficient force transmission and control. The main difference between them and ordinary pulleys is that universal pulleys can rotate freely within a wide range of angles, thus flexibly adapting to different installation and usage environments. The detection device 1 also has mounting slots 15 for the ends of the material handling conveyor line 2 and the return material conveyor line 6 to extend out. The mounting slots 15 ensure that the equipment can be extended from the detection device 1 for use.

[0035] In this embodiment, when a device for detecting the degree of expansion of tobacco leaves after loosening and rehydration is required, such as... Figure 1As shown, the sample tobacco leaves are first placed on the feeding conveyor line 2. After the feeding conveyor line 2 starts running, it transports the tobacco leaves to one end of the distributing vibrating plate 3, where they fall into the distributing vibrating plate 3 due to gravity. Then, the distributing vibrating plate 3 vibrates to disperse the tobacco sample, ensuring that the tobacco leaves are continuously output as single pieces to the conveying line 4. This step effectively avoids tobacco leaf accumulation or adhesion, providing a uniform sample distribution for subsequent image acquisition by the industrial camera 55. Then, the tobacco leaves in the distributing vibrating plate 3 fall evenly onto the conveying line 4 through multiple discharge ports 31. At this point, once the tobacco leaves are conveyed directly under the lifting hood 8, all equipment operation can be stopped. Simply activate the cylinder 72 on the U-shaped frame 7; the piston rod of the cylinder 72 pushes the lifting hood 8 downwards until the bottom of the lifting hood 8 completely locks the baffle 41 on the conveying line 4, thus covering the tobacco leaves directly below the conveying line 4. Next, the heating element 88 is activated for a period of time. The heating element 88 heats the tobacco leaves covered by the lifting hood 8. The heated tobacco leaves release their moisture, which rises and is detected by the wet-bulb and dry-bulb thermometer 86. The wet-bulb and dry-bulb thermometer 86 determines whether the tobacco leaves are loose by observing the evaporated moisture. Loose tobacco leaves evaporate moisture more quickly, affecting the wet-bulb temperature, while compacted tobacco leaves evaporate moisture more slowly, resulting in a smaller temperature difference. Therefore, it is possible to determine whether the tobacco leaves are loose or compacted. At this point, the material handling conveyor line 2, the material distributing vibrating plate 3, the material conveying line 4, and the return conveyor line 6 are activated. Finally, the tobacco leaves that detach from the material conveying line 4 fall onto the return conveyor line 6, and the tobacco leaves that fall onto the conveyor belt 61 are sent back to the production area through the partition 62, thus achieving material recycling and avoiding waste. If the inspection mechanism on conveyor line 4 fails to determine the looseness of the tobacco leaves, the leaves will be conveyed to the inspection square cover 5 and placed in the backlit area 42. At this point, the industrial camera 55, activated and working in conjunction with the backlit light source within the inspection square cover 5, captures an image of the tobacco leaves under transmitted light. This creates a clear color contrast between the folded and unfolded parts of the tobacco leaves in the image. Subsequent image analysis determines the looseness of the tobacco leaves, making the process quick and easy. Finally, the tobacco leaves removed from conveyor line 4 are returned to the production area.

[0036] The preferred embodiments of the present invention described above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. 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 the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for detecting the degree of unfolding of tobacco leaves after loosening and rehydration processing, comprising a detection device (1) for inspecting tobacco leaves, characterized in that, Also includes: The detection device (1) is equipped with a material picking conveyor (2), a material dispensing vibratory plate (3), a material conveying conveyor (4), a detection square cover (5), and a return material conveyor (6) in sequence. An industrial camera (55) is installed inside the detection square cover (5). After the material distribution vibrating plate (3) runs, it shakes the tobacco leaf samples by vibration to ensure that the tobacco leaves are continuously output to the material conveying line (4) in the form of single pieces, avoiding the accumulation or sticking of tobacco leaves, and providing a uniform sample distribution for subsequent image acquisition by the industrial camera (55). The material conveying line (4) is provided with a backlight area (42) located directly below the industrial camera (55). The backlight area (42) is used in conjunction with the industrial camera (55) to provide additional lighting behind the object being photographed by the camera. Through the backlight design and the high-resolution imaging of the industrial camera (55), the differences in the light transmittance of the tobacco leaves are captured. Combined with the image recognition algorithm, the area ratio of the gray value region is calculated. The region with a lower gray value corresponds to the part with more folded layers, while the region with a higher gray value corresponds to the part with better stretching. Based on this, the degree of stretching of the tobacco leaves is calculated. The testing agency is installed on the material conveying line (4) to test the humidity of the tobacco leaves; The detection mechanism includes a lifting cover (8) installed on the material conveying line (4). A grid plate (84) is fixedly connected inside the lifting cover (8). A heating tube (88) for heating the tobacco leaves on the material conveying line (4) is provided on the lower surface of the grid plate (84). A plurality of air vents (85) are arranged in a linear pattern on the grid plate (84). A dry and wet bulb thermometer (86) aligned with the air vents (85) is fixedly connected to the upper surface of the grid plate (84). The dry and wet bulb thermometer 86 calculates the humidity of the air by measuring the temperature difference between the dry and wet bulbs. A U-shaped frame (7) is fixedly connected to the material conveying line (4), and a cylinder (72) is provided on the U-shaped frame (7) to drive the detection mechanism to cover the tobacco leaves on the material conveying line (4). Heating tube (88) heats the tobacco leaves covered by lifting cover (8). The heated tobacco leaves will expel the water inside, and the water will float upward and be detected by wet and dry bulb thermometer (86). The wet and dry bulb thermometer (86) can tell whether the tobacco leaves are loose by the water evaporated from the tobacco leaves. Loose tobacco leaves will cause water to evaporate faster, which will affect the change of wet bulb temperature. Tight tobacco leaves will evaporate water more slowly and have a smaller temperature difference, thus indicating whether the tobacco leaves are loose or tight. By utilizing the combination of the detection mechanism, U-shaped frame (7), cylinder (72), heating tube (88) and dry and wet bulb thermometer (86), a preliminary inspection is carried out before using an industrial camera (55) to control the basic situation of the looseness of the tobacco leaves.

2. The device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing according to claim 1, characterized in that, The piston rod of the cylinder (72) moves through the U-shaped frame (7) and is fixedly connected to the upper surface of the lifting cover (8). A pair of U-shaped limiting frames (87) that hold the U-shaped frame (7) are fixedly connected to the upper surface of the lifting cover (8).

3. The device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing according to claim 1, characterized in that, The lifting cover (8) has material inlets (81) at both ends of its top. The inside of each material inlet (81) is covered with a sealing plate (82), and each sealing plate (82) is provided with multiple screws (83).

4. The device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing according to claim 1, characterized in that, Each of the U-shaped frame (7) near the end of the material conveying line (4) is provided with a pair of fixing holes (71).

5. The device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing according to claim 1, characterized in that, The bottom of the material picking conveyor line (2) is provided with a support cylinder (21), the material distributing vibrating plate (3) is provided with multiple discharge ports (31), and both sides of the material picking conveyor line (2) and the material conveying line (4) are provided with a pair of baffles (41).

6. The device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing according to claim 1, characterized in that, The return material conveying line (6) includes a conveyor belt (61) and multiple partitions (62) are provided on the conveyor belt (61).

7. The device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing according to claim 1, characterized in that, The material conveying line (4) is provided with a bracket (51) at one end away from the material distributing vibrating plate (3). The top of the bracket (51) is fixedly connected with a plurality of support blocks (52) for supporting the detection square cover (5). The middle part of the bracket (51) is also fixedly connected with a support block (54) for supporting the industrial camera (55).

8. The device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing according to claim 7, characterized in that, The bracket (51) has multiple bolt holes (53) on one end of the outer wall on both sides near the material conveying line (4).

9. The device for detecting the degree of expansion of tobacco leaves after loosening and rehydration processing according to claim 1, characterized in that, The top of the detection device (1) is rotatably connected to a rotating bracket (12), and a controller (13) is provided at the end of the rotating bracket (12) away from the detection device (1). The detection device (1) is also provided with multiple pairs of viewing windows (14). The bottom of the detection device (1) is fixedly connected with multiple universal pulleys (11). The detection device (1) is also provided with mounting slots (15) for the ends of the material picking conveyor line (2) and the return material conveyor line (6) to detach.

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