A seedling-protecting rotary leaf-cutting device for tobacco seedling pruning machines

Abstract

The utility model discloses a protect seedling rotary leaf cutting device for tobacco seedling pruning machine, including frame, drive motor, transmission, shaft coupling, sword guard cover, sword shaft assembly, left bearing seat, right bearing seat, left support and right support, and the left support and right support all are equipped with the vertical long hole of being connected through the bolt fastening of frame, and the both ends of sword shaft assembly are rotated and are connected with left bearing seat and right bearing seat through bearing respectively, and a plurality of pieces of sawtooth disc cutter are installed on sword shaft assembly, and drive motor is driven connection with one end of sword shaft assembly through transmission, shaft coupling in proper order, and sword guard cover is located at the outside of sword shaft assembly. The utility model greatly promotes tobacco seedling pruning speed, satisfies large -scale tobacco planting demand, and the design of unique sawtooth disc cutter and seedling protection board is matched with sawtooth disc cutter position height adjusting mechanism, can adapt to the tobacco seedling height of different growth period, and can accurately knock off target leaf blade, and can protect tobacco seedling stem and terminal bud simultaneously.

Description

Technical Field

[0001] This utility model belongs to the technical field of tobacco seedling leaf cutting equipment, specifically relating to a seedling protection rotating leaf cutting device used in tobacco seedling pruning machines. Background Technology

[0002] Tobacco is an annual herbaceous economic crop that occupies an important position in my country's agricultural economic system, with a perennial planting area of ​​over 1,000 hectares. Tobacco cultivation primarily relies on seedling transplanting, which involves transplanting seedlings grown in greenhouses into the field at the appropriate time. During fully automated transplanting, large and older leaves of the seedlings often get tangled and torn together, leading to problems such as over-grabbing, leaf removal, and leaf drop, severely impacting transplanting efficiency and causing missed plantings. Simultaneously, the seedling's bud leaves consume plant nutrients, affecting oxygen acquisition during growth. This hinders seedling establishment and premature growth after transplanting, ultimately reducing survival rates.

[0003] Existing tobacco seedling pruning techniques mainly include manual leaf pruning and simple mechanical leaf pruning, which suffer from problems such as low efficiency, insufficient precision, high cost, and low automation. Manual leaf pruning relies on operators using hand tools to prune each plant individually, which is slow, easily affected by human factors, and makes it difficult to ensure pruning consistency. It is labor-intensive, costly, and inefficient, and it is difficult to guarantee the consistency and accuracy of pruning. Simple mechanical leaf pruning equipment is mainly divided into two types: handheld and conveyor belt. Handheld leaf pruning machines cannot ensure consistent leaf pruning height. Although conveyor belt leaf pruning machines use a conveyor belt to transport tobacco seedlings, the cutting blade position is fixed at a fixed height and lacks a precise adjustment mechanism. This makes it impossible to adapt to the different growth stages of tobacco seedlings and easily damages the stems and terminal buds of the seedlings, making it difficult to meet the strict requirements of tobacco transplanting for seedling pruning.

[0004] Therefore, there is an urgent need to develop a rotating leaf-cutting device for seedling protection to achieve precise and efficient leaf cutting and improve the transplanting conditions of tobacco seedlings. Utility Model Content

[0005] In order to solve the above-mentioned technical problems in the prior art, this utility model provides a seedling protection rotary leaf cutting device for tobacco seedling pruning machine that only prunes the old / large leaves at the bottom of the tobacco seedling plant, ensuring pruning consistency and high efficiency.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a seedling protection rotating leaf cutting device for a tobacco seedling trimmer, comprising a frame, a drive motor, a gearbox, a coupling, a blade guard, a blade shaft assembly, a left bearing seat, a right bearing seat, a left support, and a right support. Both the left and right supports have vertical elongated holes that are bolted to the frame. The left bearing seat is bolted to the top of the left support, and the right bearing seat is bolted to the top of the right support. Both ends of the blade shaft assembly are rotatably connected to the left and right bearing seats respectively via bearings. Several serrated disc blades are evenly mounted on the blade shaft assembly. The drive motor is sequentially connected to one end of the blade shaft assembly via the gearbox and coupling. The blade guard is located outside the blade shaft assembly.

[0007] The cutter shaft assembly includes a cutter shaft with a hexagonal prism structure in the middle and cylindrical structures at both ends. The sawtooth disc cutter has a hexagonal hole in the center. The sawtooth disc cutter is mounted on the hexagonal prism structure of the cutter shaft. A spacer with an outer circle and an inner hexagon is provided between each two adjacent sawtooth disc cutters. Axial positioning components are provided on the left side of the leftmost sawtooth disc cutter and the right side of the rightmost sawtooth disc cutter. The left end of the cutter shaft is connected to the coupling for transmission via a flat key.

[0008] The serrated disc cutter includes a disc-shaped body and several cutting blades evenly arranged on the outer circumference of the disc, with a cutting edge on one side of each blade.

[0009] The axial positioning assembly includes a round nut, a stop washer, and a pressure cap. There are two round nuts, which are threaded onto the cylindrical structure of the cutter shaft. The stop washer is located between the two round nuts. One of the round nuts is pressed against the side of the disc body of the serrated disc cutter through the pressure cap.

[0010] The blade protector includes a horizontally positioned upper support plate and several vertically positioned seedling protection components. A channel for the passage of tobacco seedling stems is formed between two adjacent seedling protection components. A left connecting support plate and a right connecting support plate are respectively provided on the left and right sides of the upper support plate. The left connecting support plate is connected to the left support by bolts, and the right connecting support plate is connected to the right support by bolts. Several insertion holes are evenly opened on the upper support plate along the left and right directions, and the length direction of each insertion hole is along the front and back directions.

[0011] Each seedling protection assembly includes two parallel seedling protection plates with a gap. The front and rear edges of the two seedling protection plates are connected by a connecting component. The left connecting support plate, the right connecting support plate, and the two seedling protection plates of the seedling protection assembly all have an inverted U-shaped hole with an open bottom and open sides for the cutter shaft to pass through. Each serrated disc cutter is located in the gap between two adjacent seedling protection plates. The lower part of the serrated disc cutter is lower than the lower side of the seedling protection plate. The upper sides of the two seedling protection plates extend into the insertion hole and are fixedly connected to the upper support plate.

[0012] The connecting assembly includes a connecting bolt, a self-locking nut, and a washer. The connecting bolt passes through two seedling protection plates, the washer is coaxially mounted on the connecting bolt and located between the two seedling protection plates, and the self-locking nut is threaded to the end of the connecting bolt and presses the seedling protection plates together.

[0013] Using the above technical solution, the tobacco seedling trimmer also includes a tobacco seedling tray conveyor belt set on the frame and located between the lower parts of the left and right supports. Most of the seedling protection rotating leaf cutting device is located above the tobacco seedling tray conveyor belt. A waste removal and straightening cover is connected to the front side of the seedling protection rotating leaf cutting device. A suction fan is connected to the top of the waste removal and straightening cover through a waste removal pipe.

[0014] The front of the frame is equipped with a drive roller for driving the tobacco seedling tray conveyor belt. One end of the drive roller is connected to a conveyor drive device mounted on the frame. The front of the frame is equipped with a seedling tray guide rail on the left and right sides of the tobacco seedling tray conveyor belt. The front ends of the two seedling tray guide rails form an inlet that is wider at the front and narrower at the back, resembling the number eight.

[0015] The impurity removal and straightening cover includes a left side plate connected to the front side of the left support, a right side plate connected to the front side of the right support, and an upper side plate connected to the front side of the upper support plate. A left guide plate is provided on the front side of the left side plate, and a right guide plate is provided on the front side of the right side plate. A crossbar is provided between the upper part of the left and right guide plates. The front side of the left guide plate bends to the left, and the front side of the right guide plate bends to the left. An eight-shaped guide plate structure with a wider front and a narrower back is formed between the front ends of the left and right guide plates. An impurity removal cover is provided between the front side of the upper side plate, the top of the left side plate, the top of the right side plate, and the top of the crossbar. An impurity removal guide groove is provided inside the impurity removal cover along the left and right direction. A pipe joint connected to the impurity extraction pipe is provided at the middle position of the top of the impurity removal cover.

[0016] Compared to existing technologies, the working principle and technical effects of the tobacco seedling trimmer are as follows:

[0017] (1) The seedling tray conveyor belt is used to transport the seedling trays; the seedling protection rotating leaf cutter is used to simultaneously cut several seedlings in the seedling trays that move from front to back to the cutting position; the blade protector is used to protect the seedlings during the cutting process of the seedling protection rotating leaf cutter, ensuring that only the parts of the seedlings that need to be cut are cut, and protecting the stems and heart leaves of the seedlings from damage; the debris removal and straightening cover is used to straighten and limit the left and right sides of the seedling trays before they are transported to the seedling protection rotating leaf cutter, ensuring that each serrated disc blade can accurately act on the parts of the seedlings that need to be cut, while ensuring that the cut leaf fragments will not splash; the debris extraction pipe is used to discharge the cut leaf fragments; the suction fan is used to extract and collect the cut leaf fragments, ensuring that the leaf fragments will not fall onto the seedling trays and affect the growth of the seedlings. The seedling tray conveyor belt and the seedling protection rotating leaf cutter are driven by two different motors, and their speeds can be adjusted separately to achieve the best seedling cutting effect.

[0018] (2) The frame is constructed of aluminum profiles and fixed by 90-degree angle brackets. It is used for the installation and positioning of various parts and is responsible for supporting the weight of the entire pruning machine. The tobacco seedling tray conveyor belt is installed on the frame and is responsible for the horizontal transport of the tobacco seedling trays. The conveyor drive device is installed on the right front side of the frame through motor support and T-bolts and is responsible for providing power to the tobacco seedling tray conveyor belt. The tobacco seedling tray conveyor belt includes a motor, sprockets, chains and speed controller to realize stepless adjustment of the tobacco seedling tray transport speed. Two tray guide rails are installed on the left and right sides of the front end of the tobacco seedling tray conveyor belt and are responsible for straightening the tobacco seedling trays during transport from front to back.

[0019] (3) The right support of the seedling-protecting rotary leaf-cutting device is installed in the middle of the right side of the frame by T-bolts; the left support is installed in the middle of the left side of the frame by T-bolts; the left and right bearing seats are installed on the top of the left and right supports respectively and fixed by bolts; the left and right ends of the cutter shaft assembly are rotatably installed in the left and right bearing seats by bearings respectively, and the cutter shaft assembly is responsible for the tobacco seedling trimming work; the gearbox is installed on the top of the left support and fixed by bolts, and is responsible for adjusting the output torque of the drive motor; the drive motor is installed on the left side of the gearbox and is responsible for driving the cutter shaft assembly; the right side of the coupling is fixed to the left end of the cutter shaft assembly, and the left side of the coupling is fixed to the right end of the gearbox output shaft and fixed by set screws, and the coupling is responsible for connecting the output power of the gearbox with the transmission of the cutter shaft assembly. The left and right supports are both provided with vertical elongated holes that are fastened to the frame by bolts. By conveying and moving the left and right supports, the height of the seedling-protecting rotary leaf-cutting device can be adjusted, so that it can adapt to the trimming of tobacco seedlings at different growth stages. The rotation direction of the cutter shaft assembly is counterclockwise when viewed from the drive motor side.

[0020] (4) The left and right ends of the cutter shaft are rotated and installed in the left and right bearing seats, which are responsible for transmitting power; the A-type flat key is installed on the outer circle of the left end of the cutter shaft and connected to the coupling for transmission, which is responsible for transmitting power from the coupling to the cutter shaft; the sawtooth disc cutter is installed on the hexagonal prism structure of the cutter shaft, with a total of 17 cutters, which are evenly distributed, and is responsible for the tobacco seedling trimming work; the spacer with an outer circle and an inner hexagonal shape is installed on the hexagonal prism structure of the cutter shaft, with a total of 16 spacers, which are evenly distributed, and is responsible for positioning the sawtooth disc cutter, ensuring that the sawtooth disc cutter can accurately act on the middle intersection position of the two rows of tobacco seedling trays; the pressure cap is installed on the left and right ends of the outermost side of the sawtooth disc cutter, which is responsible for clamping the sawtooth disc cutter and the spacer; the round nuts are installed on the outer side of the pressure caps on both sides, with two on each end, which is responsible for fixing the pressure cap, the sawtooth disc cutter and the spacer; the stop washer is installed in the middle position of the two round nuts on the same end, which is responsible for preventing the round nuts from loosening, and ensuring that the parts on the cutter shaft assembly will not loosen during high-speed rotation. The round nuts on both sides of the cutter shaft assembly can be adjusted slightly to ensure that the serrated disc cutter accurately acts at the middle intersection of the two rows of tobacco seedling trays.

[0021] (5) The serrated disc blade is laser-cut from 1 mm thick 201 stainless steel plate. There are six blades, which are arranged in a circular array along the center line of the blade shaft. Taking the direction shown in the figure as a reference, the serrated disc blade rotates in the same direction as the blade shaft assembly. Taking the bottom serrated blade as an example, the vertical line on the right is the trimming position, the blade length is 46.2 mm, and the two diagonal lines on the left are the blade back. When the serrated disc blade is trimming, the blade trims the tobacco seedlings from bottom to top. The discharge guide groove set in the left and right direction inside the discharge cover is located directly above the cut tobacco leaves, which facilitates the negative pressure absorption and collection of broken leaves.

[0022] (6) The upper support plate is installed on the top of the right and left supports and fixed with bolts; the gasket is installed between the two seedling protection plates of the seedling protection assembly, which is responsible for controlling the spacing between the two seedling protection plates and ensuring that the serrated disc cutter does not generate friction when rotating in the gap between the seedling protection plates on its left and right sides; the connecting bolt and the self-locking nut are installed in the through holes cut by laser cutting on the seedling protection plate and are responsible for fixing the gasket; the self-locking nut can ensure that the nut will not loosen when the device vibrates during operation; the upper sides of the two seedling protection plates extend into the insertion holes cut by laser on the upper support plate and are connected by welding. During installation, the seedling protection plates are first connected in pairs with connecting bolts, gaskets and self-locking nuts, and then inserted into the insertion holes as a whole and then welded, which can improve the welding accuracy.

[0023] (7) When pruning, the tobacco seedlings enter the seedling protection rotating leaf cutting device from front to back; the serrated disc blade is located in the gap of a set of seedling protection plates connected by connecting bolts, gaskets and self-locking nuts, and the tobacco seedlings pass through the two sets of seedling protection components; the serrated disc blade is only exposed on the lower front side of the seedling protection plate, and the rest of the position is protected in a set of seedling protection plates; the part of the tobacco seedlings that exceeds the seedling protection plates on the left and right sides is pruned, and at the same time the seedling protection plates can protect the part of the tobacco seedlings that does not exceed the seedling protection plates on the left and right sides from being pruned, so as to prevent damage to the seedling heart leaves.

[0024] (8) The upper side plate of the impurity removal and straightening cover is connected to the front side of the upper support plate by bolts. The left side plate and the right side plate are connected to the left support and the right support by bolts, respectively. The two long holes above the impurity removal cover are installed on the upper side plate by bolts to prevent the trimmed leaf fragments from splashing. The left guide plate and the right guide plate are two symmetrical parts. The long holes at the bottom of the left guide plate and the right guide plate are installed on the frame by T-bolts. All parts of the impurity removal and straightening cover are connected by welding, and the gaps of the bolt connections are sealed with glass glue to improve the effect of negative pressure suction of leaf fragments.

[0025] (9) The waste discharge cover plate is installed on the front side of the upper side plate, the top of the left side plate, the top of the right side plate and the top of the crossbar by bolts. The gaps of the bolt connection are sealed with glass glue. The waste discharge guide channel is installed on the inner side of the top of the waste discharge cover plate and is responsible for collecting the trimmed leaves. The waste extraction pipe is installed on the pipe joint and connected to the suction fan to remove the leaves.

[0026] The novelty of this utility model is reflected in the following three aspects:

[0027] 1) Through an innovative combination of serrated disc blades and a seedling protector, pruning can be performed from the bottom up, removing older leaves at the base. It can prune tobacco seedlings at intersections of horizontal and vertical growth. The height of the serrated disc blades and the blade protector can be adjusted via elongated holes on the left and right supports of the blade shaft pruning mechanism that connect to the frame, accommodating seedling heights at different growth stages. The rotation speed of the serrated disc blades and the speed of the seedling tray conveyor belt can be coordinated for optimal pruning results. The entire device has a simple structure, is easy to operate, highly stable, and significantly improves seedling pruning efficiency.

[0028] 2) The serrated disc blades, evenly distributed along the blade shaft, are positioned by a central hexagonal spacer with an outer circle, ensuring accurate application of the serrated disc blades to the midpoint where the two rows of tobacco seedlings intersect. Both ends are positioned by end caps and secured with round nuts and locking washers, resulting in a compact structure. Furthermore, the lateral position of the serrated disc blades on the blade shaft can be slightly adjusted to ensure precise tobacco seedling trimming.

[0029] 3) The serrated disc blade is protected within a blade guard, trimming only the leaves at the base of the tobacco seedlings exposed outside the protective plate. This protects the seedling's heart leaves and main stem from damage. The distance between the protective plates on both sides of the serrated disc blade is controlled by a pad of a certain thickness, ensuring installation accuracy and reducing friction and interference between the serrated disc blade and the protective plate.

[0030] In summary, this invention utilizes an automated conveyor belt to transport seedling trays and a high-speed rotating blade assembly for rapid pruning. Compared to manual leaf pruning and simple mechanical leaf pruning, it significantly improves the speed of tobacco seedling pruning, meeting the needs of large-scale tobacco cultivation. The unique serrated disc blade and seedling protection plate design, combined with the serrated disc blade height adjustment mechanism, can adapt to the height of tobacco seedlings at different growth stages, accurately removing target leaves while protecting the stems and terminal buds. This solves the problems of inaccurate pruning and easy damage to seedlings in existing technologies, reducing manual labor. The equipment is stable and reliable, reducing subsequent replanting and equipment maintenance costs, truly achieving efficient, precise, low-cost, and highly automated tobacco seedling pruning.

[0031] Pruning at appropriate times during different growth stages of tobacco seedlings can achieve different purposes. Pruning should begin after the seedlings have closed the growing trays, reaching a height of 6-10cm and having 5-7 true leaves. This promotes balanced seedling growth, controls excessive vegetative growth, encourages root development, and enhances the seedlings' resistance to adverse conditions. Pruning before transplanting removes older and larger leaves from the lower parts of the plant, protecting the stems and terminal buds, addressing interference issues before transplanting, improving transplanting efficiency and seedling survival rates, reducing planting costs, and promoting the mechanization and high efficiency of tobacco cultivation.

[0032] By combining this utility model technology with a traditional tabletop tobacco leaf trimming machine, the large top leaves and bottom leaves can be trimmed, better meeting the requirements for mechanized transplanting of tobacco leaves. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the entire tobacco seedling trimmer;

[0034] Figure 2 A three-dimensional structural diagram of the frame and the tobacco seedling tray conveyor belt;

[0035] Figure 3 This is a three-dimensional structural diagram of the seedling protection rotating leaf-cutting device of this utility model;

[0036] Figure 4 This is a three-dimensional structural diagram of the cutter shaft assembly;

[0037] Figure 5 This is a front view of a serrated disc cutter;

[0038] Figure 6 A schematic diagram of the three-dimensional structure of the blade guard;

[0039] Figure 7 This is a schematic diagram showing the working state of a serrated disc cutter.

[0040] Figure 8 A schematic diagram of the structure for removing impurities and straightening the casing;

[0041] Figure 9 This is a schematic diagram of the structure of the waste removal cover. Detailed Implementation

[0042] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] like Figures 1-9As shown, the tobacco seedling trimmer includes a frame 1, on which a tobacco seedling tray conveyor belt 2 and a seedling protection rotating leaf cutting device 3 are mounted. The tobacco seedling tray conveyor belt 2 transports seedlings from front to back. The seedling protection rotating leaf cutting device 3 is located above the tobacco seedling tray conveyor belt 2. A waste removal and straightening cover 4 is connected to the front of the seedling protection rotating leaf cutting device 3. A suction fan 6 is connected to the top of the waste removal and straightening cover 4 through a waste removal pipe 5.

[0044] The front of the frame 1 is equipped with a drive roller for driving the tobacco seedling tray conveyor belt 2. One end of the drive roller is connected to a conveying drive device 7 installed on the frame 1. The front of the frame 1 is equipped with a seedling tray guide rail 8 on the left and right sides of the tobacco seedling tray conveyor belt 2. The front ends of the two seedling tray guide rails 8 form an inlet that is wider at the front and narrower at the back, resembling the shape of an "eight".

[0045] The seedling-protecting rotating leaf-cutting device 3 includes a drive motor 9, a gearbox 10, a coupling 11, a blade guard, a blade shaft assembly, a left bearing seat 12, a right bearing seat 13, a left support 14, and a right support 15. Both the left support 14 and the right support 15 have vertical elongated holes 16 that are fastened to the frame 1 by bolts. The left bearing seat 12 is bolted to the top of the left support 14, and the right bearing seat 13 is bolted to the top of the right support 15. The two ends of the blade shaft assembly are rotatably connected to the left bearing seat 12 and the right bearing seat 13 respectively by bearings. Several sawtooth disc blades 17 are evenly installed on the blade shaft assembly. The drive motor 9 is connected to one end of the blade shaft assembly in sequence through the gearbox 10 and the coupling 11. The blade guard is located outside the blade shaft assembly.

[0046] The cutter shaft assembly includes a cutter shaft 18 with a hexagonal prism structure in the middle and cylindrical structures at both ends. The sawtooth disc cutter 17 has a hexagonal hole 44 in the center. The sawtooth disc cutter 17 is mounted on the hexagonal prism structure of the cutter shaft 18. A spacer 19 with an outer circle and an inner hexagon is provided between each two adjacent sawtooth disc cutters 17. Axial positioning components are provided on the left side of the leftmost sawtooth disc cutter 17 and the right side of the rightmost sawtooth disc cutter 17. The left end of the cutter shaft 18 is connected to the coupling 11 through a flat key 20.

[0047] The serrated disc cutter 17 includes a disc-shaped disc body 21 and a plurality of cutting blades 22 disposed on the outer circle of the disc body 21 and evenly arranged along the circumferential direction. One side of each cutting blade 22 has a cutting edge 43.

[0048] The axial positioning assembly includes a round nut 23, a stop washer 24, and a pressure cap 25. There are two round nuts 23, which are threaded onto the cylindrical structure of the cutter shaft 18. The stop washer 24 is located between the two round nuts 23. One of the round nuts 23 is pressed against the side of the disc body 21 of the serrated disc cutter 17 through the pressure cap 25.

[0049] The blade protector includes a horizontally positioned upper support plate 26 and several vertically positioned seedling protection components. A channel for the passage of tobacco seedling stems is formed between two adjacent seedling protection components. The upper support plate 26 has a left connecting support plate 27 and a right connecting support plate 28 on its left and right sides, respectively. The left connecting support plate 27 is bolted to the left support 14, and the right connecting support plate 28 is bolted to the right support 15. Several insertion holes 29 are evenly opened on the upper support plate 26 along the left and right directions. The length direction of each insertion hole 29 is along the front and back directions.

[0050] Each seedling protection assembly includes two parallel seedling protection plates 30 with a gap. The front and rear edges of the two seedling protection plates 30 are connected by a connecting assembly 45. The left connecting support plate 27, the right connecting support plate 28, and the middle of the two seedling protection plates 30 of the seedling protection assembly are all provided with an inverted U-shaped hole 31 with an open bottom and open sides for passing through the cutter shaft 18. Each serrated disc cutter 17 is located in the gap between two adjacent seedling protection plates 30. The lower part of the cutter 22 of the serrated disc cutter 17 is lower than the lower side of the seedling protection plate 30. The upper side of the two seedling protection plates 30 extends into the insertion hole 29 and is fixedly connected to the upper support plate 26.

[0051] The connecting assembly 45 includes a connecting bolt, a self-locking nut, and a washer. The connecting bolt passes through two seedling protection plates 30. The washer is coaxially mounted on the connecting bolt and located between the two seedling protection plates 30. The self-locking nut is threaded to the end of the connecting bolt and presses the seedling protection plates 30 together.

[0052] The impurity removal and straightening cover 4 includes a left side plate 32 connected to the front side of the left support 14, a right side plate 33 connected to the front side of the right support 15, and an upper side plate 34 connected to the front side of the upper support plate 26. A left guide plate 35 is provided on the front side of the left side plate 32, and a right guide plate 36 is provided on the front side of the right side plate 33. A crossbar 37 is provided between the upper parts of the left guide plate 35 and the right guide plate 36. The front side of the left guide plate 35 bends to the left, and the front side of the right guide plate 36 bends to the left. A figure-eight shaped guide plate structure with a wider front and a narrower back is formed between the front ends of the left guide plate 35 and the right guide plate 36. An impurity removal cover plate 38 is provided between the front side of the upper side plate 34, the top of the left side plate 32, the top of the right side plate 33, and the top of the crossbar 37. An impurity removal guide groove 39 is provided inside the impurity removal cover plate 38 along the left and right directions. A pipe joint 40 connected to the impurity extraction pipe 5 is provided at the middle position of the top of the impurity removal cover plate 38.

[0053] The working principle and technical effects of the tobacco seedling trimmer are as follows:

[0054] (1) The seedling tray conveyor belt 2 is used to transport the seedling tray 41; the seedling protection rotating leaf cutting device 3 is used to trim several seedlings 42 in the seedling tray 41 that are moved from front to back to the trimming position at the same time; the blade cover is used to protect the seedlings 42 during the trimming process of the seedling protection rotating leaf cutting device 3, so that only the part of the seedlings 42 that needs to be trimmed is trimmed, and the stems and heart leaves of the seedlings 42 are not damaged; the waste removal and straightening cover 4 is used to straighten and limit the left and right sides of the seedling tray 41 that is transported to the seedling protection rotating leaf cutting device 3, so as to ensure that each serrated disc blade 17 can accurately act on the part of the seedlings 42 that needs to be trimmed, and at the same time ensure that the trimmed leaf fragments will not splash; the waste removal pipe 5 is used to discharge the trimmed leaf fragments; the suction fan 6 is used to extract and collect the trimmed leaf fragments, so as to ensure that the leaf fragments will not fall onto the seedling tray and affect the growth of the seedlings 42. The tobacco seedling tray conveyor belt 2 and the seedling protective rotating leaf cutting device 3 are driven by two different motors, and their speeds can be adjusted separately to achieve the best tobacco seedling 42 pruning effect.

[0055] (2) The frame 1 is constructed of aluminum profiles and fixed by 90-degree angle brackets. It is used for the installation and positioning of various parts and is responsible for supporting the weight of the entire pruning machine. The tobacco seedling tray conveyor belt 2 is installed on the frame 1 and is responsible for the horizontal conveying of the tobacco seedling tray 41. The conveying drive device 7 is installed on the right front side of the frame 1 through the motor support and T-bolts. It is responsible for providing power to the tobacco seedling tray conveyor belt 2. The tobacco seedling tray conveyor belt 2 includes a motor, sprockets, chains and speed controller to realize stepless adjustment of the conveying speed of the tobacco seedling tray 41. Two tray guide rails 8 are installed on the left and right sides of the front end of the tobacco seedling tray conveyor belt 2 and are responsible for straightening the tobacco seedling tray 41 in the conveying process from front to back.

[0056] (3) The right support 15 of the seedling rotating leaf cutting device 3 is installed in the middle of the right side of the frame 1 by T-bolts; the left support 14 is installed in the middle of the left side of the frame 1 by T-bolts; the left bearing seat 12 and the right bearing seat 13 are respectively installed on the top of the left support 14 and the right support 15 and are fixed by bolts; the left and right ends of the cutter shaft assembly are respectively installed in the left bearing seat 12 and the right bearing seat 13 by bearing rotation, and the cutter shaft assembly is responsible for the cutting of tobacco seedlings 42; the gearbox 10 is installed on the top of the left support 14 and fixed by bolts, and is responsible for adjusting the output torque of the drive motor 9; the drive motor 9 is installed on the left side of the gearbox 10 and is responsible for driving the cutter shaft assembly; the right side of the coupling 11 is fixed to the left end of the cutter shaft assembly, and the left side of the coupling 11 is fixed to the right end of the output shaft of the gearbox 10 and fixed by set screws, and the coupling 11 is responsible for connecting the output power of the gearbox 10 with the cutter shaft assembly. Both the left support 14 and the right support 15 have vertical elongated holes 16 that are fastened to the frame 1 with bolts. By moving the left support 14 and the right support 15, the height of the seedling-protecting rotating leaf-cutting device 3 can be adjusted to adapt to the pruning of tobacco seedlings 42 at different growth stages. The rotation direction of the cutter shaft assembly is counterclockwise when viewed from the drive motor 9 side.

[0057] (4) The left and right ends of the cutter shaft 18 are rotatably installed in the left bearing seat 12 and the right bearing seat 13, responsible for transmitting power; the A-type flat key 20 is installed on the outer circle of the left end of the cutter shaft 18 and is connected to the coupling 11 for transmission, responsible for transmitting power from the coupling 11 to the cutter shaft 18; the serrated disc cutter 17 is installed on the hexagonal prism structure of the cutter shaft 18, with a total of 17 and equidistant distribution, responsible for the tobacco seedling 42 trimming work; the outer circle and inner hexagonal spacer 19 is installed on the hexagonal prism structure of the cutter shaft 18, with a total of 16 and equidistant distribution, responsible for the positioning of the serrated disc cutter 17 and ensuring The serrated disc cutter 17 is designed to accurately act at the intersection of the two rows of tobacco seedling trays 41. Pressure caps 25 are installed on the outermost left and right ends of the serrated disc cutter 17, clamping it to the spacer 19. Round nuts 23 are installed on the outer sides of the pressure caps 25, two on each end, securing the pressure caps 25, serrated disc cutter 17, and spacer 19. Locking washers 24 are installed in the middle of the two round nuts 23 on the same end, preventing loosening and ensuring that the components on the cutter shaft assembly do not loosen during high-speed rotation. The round nuts 23 on both sides of the cutter shaft assembly can be adjusted slightly left and right to ensure that the serrated disc cutter 17 accurately acts at the intersection of the two rows of tobacco seedling trays 41.

[0058] (5) The serrated disc blade 17 is laser-cut from 1 mm thick 201 stainless steel plate. There are six blades 22, which are arranged in a circumferential array along the center line of the blade shaft 18. Taking the direction shown in the figure as a reference, the serrated disc blade 17 rotates in the same direction as the blade shaft assembly. Taking the bottom serrated blade as an example, the vertical line on the right is the trimming position, the blade 43 is 46.2 mm long, and the two diagonal lines on the left are the blade back. When the serrated disc blade 17 is trimming, the blades 22 of the serrated disc blade 17 trim the tobacco seedlings 42 from bottom to top. The discharge guide groove 39 set in the left and right direction inside the discharge cover plate 38 is located directly above the cut tobacco leaves, which facilitates the negative pressure absorption and collection of broken leaves.

[0059] (6) The upper support plate 26 is installed on the top of the right support 15 and the left support 14 and is fixed by bolts; the gasket is installed between the two seedling protection plates 30 of the seedling protection assembly, which is responsible for controlling the spacing between the two seedling protection plates 30 and ensuring that the serrated disc cutter 17 does not generate friction when rotating in the gap between the seedling protection plates 30 on its left and right sides; the connecting bolt and the self-locking nut are installed in the through holes cut by laser cutting on the seedling protection plates 30 and are responsible for fixing the gasket; the self-locking nut can ensure that the nut will not loosen when the device vibrates during operation; the upper sides of the two seedling protection plates 30 extend into the insertion holes 29 cut by laser on the upper support plate 26 and are connected by welding. During installation, the seedling protection plates 30 are first connected in pairs with connecting bolts, gaskets and self-locking nuts, and then inserted into the insertion holes 29 as a whole and then welded, which can improve the welding accuracy.

[0060] (7) When pruning, the tobacco seedlings 42 enter the seedling protection rotating leaf cutting device 3 from front to back; the serrated disc blade 17 is located in the gap of a set of seedling protection plates 30 connected by connecting bolts, gaskets and self-locking nuts, and the tobacco seedlings 42 pass through the two sets of seedling protection components; the serrated disc blade 17 only protrudes from the lower front side of the seedling protection plate 30, and the rest of the position is protected within a set of seedling protection plates 30; the parts of the tobacco seedlings 42 that extend beyond the seedling protection plates 30 on the left and right sides are pruned, and at the same time the seedling protection plates 30 can protect the parts of the tobacco seedlings 42 that do not extend beyond the seedling protection plates 30 on the left and right sides from being pruned, so as to prevent damage to the heart leaves of the tobacco seedlings 42; the present invention is used to prune the old leaves on the lower left and right sides of several tobacco seedlings 42 arrayed inside the tobacco seedling tray 41. If the old leaves on the front and back sides of the tobacco seedlings 42 are further pruned, the tobacco seedling tray 41 can be rotated 90° and the distance between the two tray guide rails 8 can be adjusted, and then placed on the tobacco seedling tray conveyor belt 2 again for old leaf pruning.

[0061] (8) The upper side plate 34 of the impurity discharge and straightening cover 4 is connected to the front side of the upper support plate 26 by bolts. The left side plate 32 and the right side plate 33 are connected to the left support 14 and the right support 15 by bolts, respectively. The two long holes above the impurity discharge cover 38 are installed on the upper side plate 34 by bolts, which are responsible for preventing the trimmed leaf fragments from splashing. The left guide plate 35 and the right guide plate 36 are two symmetrical parts. The long holes at the bottom of the left guide plate 35 and the right guide plate 36 are installed on the frame 1 by T-bolts. All parts of the impurity discharge and straightening cover 4 are connected by welding, and the gaps of the bolt connections are sealed with glass glue to improve the effect of negative pressure suction of leaf fragments.

[0062] (9) The waste discharge cover plate 38 includes the front side of the upper side plate 34, the top of the left side plate 32, the top of the right side plate 33 and the top of the crossbar 37, which are installed by bolts. The gaps of the bolt connection are sealed with glass glue. The waste discharge guide channel 39 is installed on the inner side of the top of the waste discharge cover plate 38 and is responsible for collecting the trimmed leaves. The waste extraction pipe 5 installed on the pipe joint 40 is connected to the suction fan 6 and is responsible for removing the leaves.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A rotating leaf-cutting device for protecting seedlings in a tobacco seedling trimmer, characterized in that: The assembly includes a frame, drive motor, gearbox, coupling, cutter guard, cutter shaft assembly, left bearing housing, right bearing housing, left support, and right support. Both the left and right supports have vertical elongated holes that are bolted to the frame. The left bearing housing is bolted to the top of the left support, and the right bearing housing is bolted to the top of the right support. Both ends of the cutter shaft assembly are rotatably connected to the left and right bearing housings respectively via bearings. Several sawtooth disc cutters are evenly mounted on the cutter shaft assembly. The drive motor is sequentially connected to one end of the cutter shaft assembly via the gearbox and coupling. The cutter guard is located outside the cutter shaft assembly.

2. The seedling-protecting rotary leaf-cutting device for a tobacco seedling trimmer according to claim 1, characterized in that: The cutter shaft assembly includes a cutter shaft with a hexagonal prism structure in the middle and cylindrical structures at both ends. The sawtooth disc cutter has a hexagonal hole in the center. The sawtooth disc cutter is mounted on the hexagonal prism structure of the cutter shaft. A spacer with an outer circle and an inner hexagon is provided between each two adjacent sawtooth disc cutters. Axial positioning components are provided on the left side of the leftmost sawtooth disc cutter and the right side of the rightmost sawtooth disc cutter. The left end of the cutter shaft is connected to the coupling for transmission via a flat key.

3. The seedling-protecting rotary leaf-cutting device for a tobacco seedling trimmer according to claim 2, characterized in that: The serrated disc cutter includes a disc-shaped body and several cutting blades evenly arranged on the outer circumference of the disc, with a cutting edge on one side of each blade.

4. The seedling-protecting rotary leaf-cutting device for a tobacco seedling trimmer according to claim 2, characterized in that: The axial positioning assembly includes a round nut, a stop washer, and a pressure cap. There are two round nuts, which are threaded onto the cylindrical structure of the cutter shaft. The stop washer is located between the two round nuts. One of the round nuts is pressed against the side of the disc body of the serrated disc cutter through the pressure cap.

5. The seedling-protecting rotary leaf-cutting device for a tobacco seedling trimmer according to claim 2, characterized in that: The blade protector includes a horizontally positioned upper support plate and several vertically positioned seedling protection components. A channel for the passage of tobacco seedling stems is formed between two adjacent seedling protection components. A left connecting support plate and a right connecting support plate are respectively provided on the left and right sides of the upper support plate. The left connecting support plate is connected to the left support by bolts, and the right connecting support plate is connected to the right support by bolts. Several insertion holes are evenly opened on the upper support plate along the left and right directions, and the length direction of each insertion hole is along the front and back directions. Each seedling protection assembly includes two parallel seedling protection plates with a gap. The front and rear edges of the two seedling protection plates are connected by a connecting component. The left connecting support plate, the right connecting support plate, and the two seedling protection plates of the seedling protection assembly all have an inverted U-shaped hole with an open bottom and open sides for the cutter shaft to pass through. Each serrated disc cutter is located in the gap between two adjacent seedling protection plates. The lower part of the serrated disc cutter is lower than the lower side of the seedling protection plate. The upper sides of the two seedling protection plates extend into the insertion hole and are fixedly connected to the upper support plate.

6. The seedling-protecting rotary leaf-cutting device for a tobacco seedling trimmer according to claim 5, characterized in that: The connecting assembly includes a connecting bolt, a self-locking nut, and a washer. The connecting bolt passes through two seedling protection plates, the washer is coaxially mounted on the connecting bolt and located between the two seedling protection plates, and the self-locking nut is threaded to the end of the connecting bolt and presses the seedling protection plates together.

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