Raw material plate screening mechanism for pencil production

Abstract

The utility model belongs to the technical field of pencil raw material plate screening devices, and particularly relates to a raw material plate screening mechanism for pencil production, which comprises a workbench, and a feeding mechanism, a conveying mechanism, a sorting device and a discharging mechanism are arranged on the workbench; the feeding mechanism is used for placing plates on the conveying mechanism one by one. The conveying mechanism is used for conveying the plates to the sorting device. The sorting device is used for screening the plates conveyed on the conveying mechanism and removing unqualified plates; the discharging mechanism is used for conveying the qualified plates conveyed on the conveying mechanism to the next procedure, the visual collection terminal of the sorting device collects images of the plates conveyed to the detection platform and sends the images to the control terminal, the control terminal judges whether the plates are qualified or not, and the unqualified plates are removed from the detection platform through the screening mechanism. Qualified plates are conveyed to the discharging mechanism through the conveying mechanism, and the automation level and the product quality control capacity of pencil production are remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pencil raw material plate screening devices, in particular to a raw material plate screening mechanism for pencil production. Background Art

[0002] A pencil is a type of pen used for writing and sketching, with a history of over 400 years. Pencil barrels are made of materials such as wood, paper, and plastic, while the lead is primarily composed of graphite and clay. Pencils come in a wide variety of styles, including those with wooden barrels, sharpened barrels, and capped pencils. The advent of capped pencils addresses several issues with traditional pencils, such as unsanitary conditions, easily broken tips, and portability. Pencil hardness is indicated by "H" and "B," with "H" representing hardness and "B" representing blackness, with higher numbers indicating greater hardness or blackness. The pencil manufacturing process involves mixing graphite and clay, extruding, drying by heating, and firing the material. Finally, the lead is impregnated with oil and then assembled with the barrel. The barrel can be made of wood or plastic, and the manufacturing process includes molding, offset printing, and assembly. The existing pencil production line does not have the function of detecting and screening the external defects of pencil plates. Manual screening is required, which is time-consuming and labor-intensive, affecting processing efficiency and thus failing to meet actual usage needs. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model provides a raw material plate screening mechanism for pencil production. The visual acquisition terminal of the sorting device collects images of the plates conveyed to the detection platform and sends the images to the control terminal. The control terminal determines whether the plates are qualified. Unqualified plates are removed from the detection platform through the screening mechanism, and qualified plates are conveyed to the unloading mechanism through the transmission mechanism, thereby solving the problems in the above background.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a raw material plate screening mechanism for pencil production, comprising a workbench, on which a loading mechanism, a transmission mechanism, a sorting device and a unloading mechanism are provided; the loading mechanism is used to place the plates one by one on the transmission mechanism; the transmission mechanism is used to transport the plates to the sorting device; the sorting device is used to screen the plates transported on the transmission mechanism and remove unqualified plates; and the unloading mechanism is used to transport qualified plates transported on the transmission mechanism to the next process.

[0005] Preferably, the sorting device includes a detection platform arranged on a workbench, a visual acquisition terminal and a screening mechanism are arranged above the detection platform, and the visual acquisition terminal is electrically connected to the control terminal.

[0006] Preferably, the visual acquisition terminal is used to capture images of the plates transported to the inspection platform and send the images to the control terminal. The control terminal determines whether the plates are qualified. Unqualified plates are removed from the inspection platform through a screening mechanism, and qualified plates are transported to the unloading mechanism through a transmission mechanism.

[0007] Preferably, the screening mechanism includes a first servo motor arranged on one side of the detection platform, the output end of the first servo motor is fixedly connected to a first fixed push plate, and a first rubber pad is provided on the first fixed push plate.

[0008] Preferably, the visual acquisition terminal includes a camera arranged on the top of the detection platform.

[0009] Preferably, the loading mechanism includes a material box arranged on one side of the workbench, a discharge port is provided at the bottom of the material box, a second servo motor is provided on one side of the discharge port, the output end of the second servo motor is fixedly connected to a second fixed push plate, a second rubber pad is provided on the second fixed push plate, and the pushing direction of the second servo motor is consistent with the conveying direction of the transmission mechanism.

[0010] Preferably, the transmission mechanism includes a third servo motor installed on one side of the workbench, and the output end of the third servo motor is fixedly connected to a transmission roller.

[0011] Preferably, the unloading mechanism includes a collecting frame arranged at the end of the transmission mechanism, a collecting box is arranged in the collecting frame, and a handle is arranged on the collecting box.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention proposes a raw material plate screening mechanism for pencil production, which collects images of the plates conveyed to the detection platform through the visual acquisition terminal of the sorting device and sends the images to the control terminal. The control terminal determines whether the plates are qualified. Unqualified plates are removed from the detection platform through the screening mechanism, and qualified plates are conveyed to the unloading mechanism through the transmission mechanism, which significantly improves the automation level of pencil production and the product quality control capability.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the three-dimensional structure of a raw material plate screening mechanism for pencil production Figure 1 .

[0015] Figure 2 A schematic diagram of the three-dimensional structure of a raw material plate screening mechanism for pencil production Figure 2 .

[0016] Figure 3The figure is a cross-sectional view of a raw material plate screening mechanism for pencil production.

[0017] Figure 4 The figure is a cross-sectional view of a sorting device of a raw material plate screening mechanism used in pencil production.

[0018] Figure 5 The figure is a schematic diagram of the three-dimensional structure of a sorting device for screening raw material plates used in pencil production.

[0019] Figure 6 The figure is a schematic diagram of the three-dimensional structure of a feeding mechanism of a raw material plate screening mechanism used in pencil production.

[0020] Figure 7 The figure is a schematic diagram of the three-dimensional structure of a screening mechanism for raw material plates used in pencil production.

[0021] Figure 8 This is a three-dimensional structural exploded diagram of a screening mechanism for raw material plates used in pencil production.

[0022] In the figure: 1. Workbench; 2. Loading mechanism; 21. Material box; 22. Discharge port; 23. Second servo motor; 24. Second fixed push plate; 25. Second rubber pad; 3. Transmission mechanism; 31. Third servo motor; 32. Transmission roller; 4. Sorting device; 41. Inspection platform; 42. Visual acquisition terminal; 43. Screening mechanism; 431. First servo motor; 432. First fixed push plate; 433. First rubber pad; 44. Control terminal; 5. Unloading mechanism; 51. Collection frame; 52. Collection box; 53. Handle. DETAILED DESCRIPTION

[0023] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present invention but are not intended to limit the scope of the present invention. All other embodiments obtained by persons of ordinary skill in the art without creative effort are intended to fall within the scope of protection of the present invention.

[0024] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a raw material sheet screening mechanism for pencil production includes a workbench 1 equipped with a loading mechanism 2, a conveying mechanism 3, a sorting device 4, and a discharging mechanism 5. The loading mechanism 2 is used to place the raw materials one by one onto the conveying mechanism 3; the conveying mechanism 3 is used to transport the raw materials to the sorting device 4; the sorting device 4 is used to screen the raw materials conveyed by the conveying mechanism 3 and remove unqualified raw materials; and the discharging mechanism 5 is used to transport qualified raw materials conveyed by the conveying mechanism 3 to the next process. Specifically, this raw material sheet screening mechanism for pencil production fully considers the continuity and quality control of the production process. The workbench 1 serves as the basic support platform of the entire screening mechanism and is made of durable metal with a non-slip and wear-resistant coating to ensure stable operation and easy cleaning and maintenance. The loading mechanism 2 is designed with an automatic feeding device. Using technologies such as a vibrating plate or a robotic arm, it can automatically grab or push the raw materials and accurately place them one by one at the starting position of the conveying mechanism 3. The loading mechanism 2 is equipped with an inductive sensor. It releases the next sheet only when it detects that the previous sheet has been safely placed on the conveyor mechanism 3. This effectively prevents stacking and collisions between sheets, ensuring continuous and accurate loading. The conveyor mechanism 3 utilizes a high-efficiency belt conveyor system or roller conveyor, adjusting the conveying speed and tension according to the sheet material and size to ensure smooth, non-drifting conveyance. The sorting device 4 is the core component of the entire screening mechanism. It utilizes advanced machine vision technology combined with high-precision sensors to perform comprehensive scanning and inspection of the sheets on the conveyor mechanism 3. The system incorporates multiple pre-set screening criteria, such as sheet size, thickness, flatness, and surface defects, to automatically identify and sort out sheets that do not meet the requirements. Upon detecting an unqualified sheet, the sorting device 4 immediately activates a rejection mechanism, such as a pneumatic pusher or robotic arm, to remove it from the conveyor line and direct it to a designated recycling area, while ensuring that qualified sheets continue to be transported. The unloading mechanism 5 is responsible for accurately and securely transporting the rigorously screened, qualified sheets to the next process step. The unloading mechanism also integrates a counter and recording system, capable of real-time counting and recording the number of qualified sheets, providing accurate data support for production management. This intelligent, efficient, and precise screening mechanism for raw sheet materials used in pencil production significantly improves the automation level and product quality control capabilities of pencil production.

[0025] Combine Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 8As shown, the sorting device 4 includes a detection platform 41 arranged on the workbench 1, and a visual acquisition terminal 42 and a screening mechanism 43 are arranged above the detection platform 41. The visual acquisition terminal 42 is electrically connected to the control terminal 44. Specifically, the sorting device 4 ensures the accuracy and efficiency of plate screening. The detection platform 41 is installed on the workbench 1 and is made of high-strength, corrosion-resistant materials to withstand the impact and friction that may be generated during the transmission of the plate. The detection platform 41 is also integrated with a high-precision positioning device, such as a photoelectric sensor or a laser locator, which can accurately identify the position and posture of the plate and provide basic data for subsequent detection and screening. The visual acquisition terminal 42 is the "eye" of the sorting device 4. It is suspended above the detection platform 41 and performs all-round and multi-angle visual inspection of the plate through a high-resolution camera and advanced image processing technology. The visual acquisition terminal 42 has the characteristics of high sensitivity and low latency, and can capture subtle changes on the surface of the plate in real time, such as scratches, stains, color difference, cracks and other defects. It also supports multiple light source modes to accommodate the inspection requirements of boards of varying materials and colors, ensuring the accuracy and reliability of test results. The screening mechanism 43 works closely with the inspection platform 41 to quickly and accurately screen boards based on the inspection data provided by the visual acquisition terminal 42. This mechanism may utilize a variety of actuators, such as pneumatic push rods, robotic arms, or electromagnets, allowing for flexible configuration to meet diverse screening requirements. When unqualified boards are detected, the screening mechanism 43 responds quickly by physically removing them from the conveyor line and directing them to a recycling area. Furthermore, to prevent misjudgments and missed detections, the screening mechanism 43 is equipped with a re-inspection mechanism to perform a second inspection on suspected unqualified boards, ensuring the accuracy of the screening results. The control terminal 44, serving as the "brain" of the sorting device 4, is responsible for receiving, processing, and analyzing the inspection data from the visual acquisition terminal 42. Equipped with a high-performance processor and advanced algorithm software, the control terminal 44 calculates various board parameters in real time and compares them against pre-set screening criteria. Upon detecting a board that does not meet the requirements, the control terminal 44 immediately sends a command to the screening mechanism 43, initiating the removal process. In addition, the control terminal 44 also has functions such as data recording, statistics and report generation, which can provide real-time feedback on production status and provide strong support for production management.

[0026] Combine Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, the visual acquisition terminal 42 is used to collect images of the plates transported to the inspection platform 41 and send the images to the control terminal 44. The control terminal 44 determines whether the plates are qualified. Unqualified plates are removed from the inspection platform 41 through the screening mechanism 43, and qualified plates are transported to the unloading mechanism 5 through the transmission mechanism 3. Figure 3 、 Figure 5 、 Figure 6 and Figure 7 As shown, the screening mechanism 43 includes a first servo motor 431 provided on one side of the detection platform 41. The output end of the first servo motor 431 is fixedly connected to a first fixed push plate 432. A first rubber pad 433 is provided on the first fixed push plate 432. Figure 2 、 Figure 3 、 Figure 5 and Figure 6As shown, the visual acquisition terminal 42 includes a camera mounted atop the inspection platform 41. Specifically, the visual acquisition terminal 42 ensures accurate and efficient board quality inspection. Beyond simply capturing images, the visual acquisition terminal 42 integrates advanced image processing technology and intelligent recognition algorithms to achieve comprehensive, high-precision inspection of board materials. The core of the visual acquisition terminal 42 is a high-definition camera mounted atop the inspection platform 41. Featuring high resolution, high sensitivity, and a wide dynamic range, it can clearly capture minute details on the board surface, including color, texture, and defects. The camera's adjustable angle allows for flexible adjustment to accommodate varying board sizes and shapes, ensuring comprehensive inspection coverage. Image data captured by the camera is transmitted in real time to the control terminal 44 for rapid processing using built-in image processing software. This software automatically removes image noise, enhances contrast, and sharpens edges, improving image quality and providing a clear image foundation for subsequent intelligent recognition. The control terminal 44 incorporates an advanced intelligent recognition algorithm. Based on deep learning or machine learning techniques and trained and optimized with extensive sample data, this algorithm can accurately identify various board defects, such as cracks, scratches, stains, and color differences. At the same time, the algorithm automatically determines whether the sheet material is qualified based on preset screening criteria and feeds the results back to the screening mechanism 43. The core power source of the screening mechanism 43 comes from a first servo motor 431 located on one side of the inspection platform 41. The first servo motor 431 features high precision, high stability, and rapid response, precisely controlling the speed and position of the push plate, ensuring the accuracy and reliability of the screening process. The output of the first servo motor 431 is directly connected to a first fixed push plate 432, which is driven by the first servo motor 431 to move along a predetermined trajectory. To reduce impact and damage to the sheet material, a first rubber pad 433 is specially installed on the first fixed push plate 432. The first rubber pad 433 provides excellent cushioning and wear resistance, protecting the first fixed push plate 432 from contact with the sheet material, preventing scratches or damage to the sheet material surface. When the control terminal 44 determines that a sheet material is unqualified, it immediately sends a command to the screening mechanism 43. The first servo motor 431 then activates, driving the first fixed push plate 432 to quickly and smoothly remove the unqualified sheet material from the inspection platform 41. The entire screening process is rapid and accurate, effectively improving screening efficiency and quality. The close cooperation between the visual acquisition terminal 42 and the screening mechanism 43 provides strong technical support for the screening of raw material sheets for pencil production, ensuring the continuity of the production line and the stability of product quality.

[0027] Combine Figure 2 、 Figure 3 and Figure 4As shown, the loading mechanism 2 includes a material box 21 positioned on one side of the workbench 1. A discharge port 22 is located at the bottom of the material box 21. A second servo motor 23 is mounted next to the discharge port 22. A second fixed push plate 24 is fixedly connected to the output end of the second servo motor 23. A second rubber pad 25 is mounted on the second fixed push plate 24. The pushing direction of the second servo motor 23 aligns with the conveying direction of the conveyor mechanism 3. Specifically, the loading mechanism 2 enables automatic, continuous, and smooth loading of sheet materials, laying a solid foundation for subsequent screening operations. The material box 21 is a container for storing sheet materials to be screened. It is typically located on the side of the workbench 1, making it convenient for operators to load sheet materials and perform routine maintenance. The material box 21 is constructed of durable materials, such as stainless steel or high-strength plastic, to ensure its load-bearing capacity and longevity. The interior of the material box 21 features a rational spatial layout, accommodating sufficient sheet materials to meet production needs while preventing excessive squeezing and damage between the sheets. The discharge port 22, located at the bottom of the material box 21, serves as a passage for the sheets to enter the conveyor mechanism 3. The size and shape of the discharge port 22 are customized according to the size and shape of the plates to ensure smooth passage without obstruction or falling. The edges of the discharge port 22 are smoothed to reduce friction and damage to the plates during passage. Furthermore, the discharge port 22 may be equipped with an adjustable baffle or gate to control the discharge speed and quantity of the plates, achieving synchronization and coordination with the conveyor mechanism 3. The second servo motor 23 is the core component that drives the loading mechanism 2 to automatically push the plates. The second servo motor 23 is mounted below or on the side of the material bin 21, and its output end is securely connected to the second fixed push plate 24. The second servo motor 23 features high precision, high stability, and fast response, enabling precise control of the movement speed and position of the second fixed push plate 24. Through a preset program or instructions from the control terminal 44, the second servo motor 23 can push the plates one by one from the discharge port 22 into the conveyor mechanism 3 at a set rhythm and force. The second fixed push plate 24 is the direct component of the second servo motor 23 pushing the plates. The shape and size of the second fixed push plate 24 are designed according to the characteristics of the discharge port 22 and the plate to ensure close contact with the plate and stable pushing. The material of the second fixed push plate 24 needs to have a certain strength and wear resistance to withstand the mechanical stress of repeated pushing. In order to reduce the impact and damage to the plate, a second rubber pad 25 is specially provided on the second fixed push plate 24. The second rubber pad 25 has good buffering performance and friction, which can play a protective role when the second fixed push plate 24 contacts the plate, avoiding scratches or noise on the surface of the plate. The pushing direction of the second servo motor 23 is consistent with the conveying direction of the transmission mechanism 3, which is the key to ensuring that the plate can smoothly and continuously enter the transmission mechanism 3 and maintain stable transmission. By precisely controlling the speed and thrust of the second servo motor 23, a smooth transition of the plate from the material box 21 to the transmission mechanism 3 can be achieved, avoiding the phenomenon of tilting, sliding or piling of the plate during the handover process.It not only improves the loading efficiency, but also reduces the operating difficulty and failure rate, creating favorable conditions for subsequent screening work.

[0028] Combine Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the transmission mechanism 3 includes a third servo motor 31 mounted on one side of the workbench 1. The output end of the third servo motor 31 is fixedly connected to a conveyor roller 32. Specifically, the transmission mechanism 3 enables efficient and stable transmission of the sheet metal from the loading mechanism 2 to the sorting device 4. The third servo motor 31, as the power source of the transmission mechanism 3, is mounted on one side of the workbench 1 and drives the conveyor roller 32 through a precise control system. The third servo motor 31, with its high precision, high stability, and fast response, ensures that the transmission mechanism 3 operates stably at the preset speed and rhythm. The third servo motor 31 integrates advanced drive technology and intelligent control algorithms, enabling flexible adjustments based on production needs, such as speed change, reversal, or pause, to meet the requirements of different sheet metals and processes. The conveyor roller 32 is a core component of the transmission mechanism 3 and is fixedly connected to the output end of the third servo motor 31. The conveyor roller 32 is typically made of wear-resistant and corrosion-resistant materials, such as stainless steel or special alloys, to ensure its long-term reliability and durability. The surface of the conveying roller 32 may also be specially treated, such as spraying an anti-slip coating or processing it into a specific texture, to increase the friction between the plate and the conveying roller 32 to prevent the plate from sliding or shifting during transmission. The conveying rollers 32 are arranged in a certain layout in the transmission mechanism 3 to form one or more continuous transmission paths. The conveying rollers 32 are connected to each other through transmission methods such as chains, belts or gears to ensure that they can rotate synchronously and drive the plate forward. This layout and transmission method not only improves the transmission efficiency, but also ensures the stability and consistency of the plate during transmission. Through the precise coordination of the third servo motor 31 and the conveying roller 32, the transmission mechanism 3 realizes the efficient and stable transmission of the plate from the feeding mechanism 2 to the sorting device 4, providing strong support for the entire screening process.

[0029] Combine Figure 2 、 Figure 3 and Figure 4As shown, the unloading mechanism 5 includes a collection frame 51 disposed at the end of the conveying mechanism 3. A collection box 52 is disposed within the collection frame 51, and a handle 53 is provided on the collection box 52. Specifically, the unloading mechanism 5 safely and orderly collects qualified plates after being screened by the sorting device 4 for subsequent processing or use. The collection frame 51 is disposed at the end of the conveying mechanism 3 and serves as a container for receiving qualified plates. The collection frame 51 is made of a sturdy and durable material, such as steel or aluminum alloy, to ensure its load-bearing capacity and stability. The structure of the collection frame 51 has been optimized to accommodate sufficient plates while facilitating seamless connection with the conveying mechanism 3, thereby reducing loss and damage to the plates during the transfer process. The collection box 52 is a removable component placed inside the collection frame 51 and is used to actually store the qualified plates. The design of the collection box 52 fully considers the characteristics and collection requirements of the plates, such as size, shape, and weight. The material of the collection box 52 is also required to be sturdy and durable, and have a certain degree of corrosion resistance to cope with various working environments. The handle 53 is an important auxiliary component provided on the collection box 52, providing the operator with a convenient way to carry and move it. The design of the handle 53 fully considers the principles of ergonomics, ensuring that the operator can easily grip and apply force while reducing hand fatigue and discomfort. The handle 53 is usually made of a strong and durable material, such as stainless steel or hard plastic, and is treated with an anti-slip finish to ensure safety and stability during handling. The unloading mechanism 5 achieves the safe and orderly collection of qualified plates through the precise coordination of components such as the collection frame 51, the collection box 52 and the handle 53, bringing the entire screening process to a successful conclusion.

[0030] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A raw material plate screening mechanism for pencil production, comprising a workbench (1), characterized in that: A loading mechanism (2), a transmission mechanism (3), a sorting device (4) and a unloading mechanism (5) are provided on the workbench (1); The loading mechanism (2) is used to place the plates one by one on the transmission mechanism (3); The transmission mechanism (3) is used to transport the plate to the sorting device (4); The sorting device (4) is used to screen the plates transported on the transmission mechanism (3) and remove unqualified plates; The unloading mechanism (5) is used to transport the qualified plates transported by the transmission mechanism (3) to the next process.

2. A raw material plate screening mechanism for pencil production according to claim 1, characterized in that: The sorting device (4) comprises a detection platform (41) arranged on a workbench (1); a visual acquisition terminal (42) and a screening mechanism (43) are arranged above the detection platform (41); and the visual acquisition terminal (42) is electrically connected to a control terminal (44).

3. A raw material plate screening mechanism for pencil production according to claim 2, characterized in that: The visual acquisition terminal (42) is used to acquire images of the plates transported to the inspection platform (41) and send the images to the control terminal (44). The control terminal (44) determines whether the plates are qualified. Unqualified plates are removed from the inspection platform (41) through the screening mechanism (43), and qualified plates are transported to the unloading mechanism (5) through the transmission mechanism (3).

4. A raw material plate screening mechanism for pencil production according to claim 3, characterized in that: The screening mechanism (43) comprises a first servo motor (431) arranged on one side of the detection platform (41); an output end of the first servo motor (431) is fixedly connected to a first fixed push plate (432); and a first rubber pad (433) is arranged on the first fixed push plate (432).

5. A raw material plate screening mechanism for pencil production according to claim 4, characterized in that: The visual acquisition terminal (42) includes a camera arranged on the top of the detection platform (41).

6. A raw material plate screening mechanism for pencil production according to claim 5, characterized in that: The loading mechanism (2) comprises a material box (21) arranged on one side of the workbench (1); a discharge port (22) is arranged at the bottom of the material box (21); a second servo motor (23) is arranged on one side of the discharge port (22); an output end of the second servo motor (23) is fixedly connected to a second fixed push plate (24); a second rubber pad (25) is arranged on the second fixed push plate (24); and a pushing direction of the second servo motor (23) is consistent with a conveying direction of the transmission mechanism (3).

7. A raw material plate screening mechanism for pencil production according to claim 6, characterized in that: The transmission mechanism (3) comprises a third servo motor (31) mounted on one side of the workbench (1), and an output end of the third servo motor (31) is fixedly connected to a transmission roller (32).

8. A raw material plate screening mechanism for pencil production according to claim 7, characterized in that: The unloading mechanism (5) comprises a collecting frame (51) arranged at the end of the transmission mechanism (3); a collecting box (52) is arranged in the collecting frame (51); and a handle (53) is arranged on the collecting box (52).

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