Walking type vegetable harvester

Abstract

The invention relates to the technical field of harvesters, in particular to a walking vegetable harvester which is characterized in that wheels are mounted on two sides of a frame in a rolling manner, and a handle is fixedly mounted on one side of the frame; a harvesting tool bit is fixedly installed in front of the frame and used for cutting vegetable rhizomes through reciprocating motion, self-balancing mechanisms are fixedly installed at the two ends of the harvesting tool bit, the self-balancing mechanisms obtain the coaxiality through high-speed rotating parts, and a telescopic mechanism is fixedly installed on the harvesting tool bit. The telescopic mechanism changes the position of the harvesting tool bit through reset springback and rotary stretching and retracting. A self-balancing mechanism is arranged, and a harvesting cutter head is horizontally stabilized by utilizing the axis fixing performance of a rotor during high-speed rotation, so that the working efficiency is guaranteed, meanwhile, crop cuts are flat, and the maximum economic value is provided; by arranging the telescopic mechanism, posture conversion of the harvesting tool bit according to different states is achieved, the structural strength is enhanced in the working process, and the harvesting efficiency is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of harvester technology, specifically to a walk-behind vegetable harvester. Background Technology

[0002] my country is a populous country and also a major agricultural country. In many rural areas of my country, many farmers still engage in small-scale vegetable cultivation, which is one of the important material guarantees for urban life.

[0003] With the development of technological and modern agriculture, agricultural machinery has entered thousands of households. It is no longer just used in large-scale standardized planting bases of enterprises, but also in small-scale privately contracted land. Compared with large combine harvesters that cost millions, hand-held vegetable harvesters are the first choice for many farmers and small-scale agricultural practitioners. Hand-held vegetable harvesters can be operated by a single person, are relatively inexpensive, and are generally powered by diesel and batteries, making them suitable for small-scale harvesting scenarios.

[0004] Hand-held vegetable harvesters are typically propelled by human power or driven by an electric motor. During harvesting, the soil in the fields is often uneven, making it difficult to ensure that the two wheels are at the same level. This causes the harvesting blades mounted at the front of the machine to tilt at a certain angle, resulting in uneven cuts. Uneven cuts affect the appearance and are not conducive to later market sales. Furthermore, tilted cuts hinder the recovery of multiple crops, causing significant economic losses. When the hand-held vegetable harvester moves to the field, the harvesting blades are positioned too low. This means that the horizontal position of the harvesting blades makes them susceptible to contact with hard objects on the road, reducing their sharpness or even damaging them. This affects the harvesting work and delays the best time to harvest the crops.

[0005] In practice, there is an urgent need to provide a new type of hand-held vegetable harvester that can overcome the above-mentioned defects. Summary of the Invention

[0006] The purpose of this invention is to at least address the shortcomings of the existing technology: when the hand-held vegetable harvester moves on the ground in the field, the unevenness of the ground causes the two drive wheels to be at different heights, resulting in a certain tilt angle of the harvesting head, which reduces the working efficiency and makes the blades uneven; when not in use, the harvester head is placed horizontally, which can easily lead to a decrease in sharpness or even damage to the blades during transportation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a hand-held vegetable harvester, comprising a handle, a frame, and wheels. The wheels are rotatably mounted on both sides of the frame, with two wheels respectively located on each side of the frame and mounted using bearings. The handle is fixedly mounted on one side of the frame using welding and bolting. A harvesting blade is fixedly mounted at the front of the frame using bolting and snap-fit ​​mounting. The harvesting blade is used to cut vegetable roots and stems through reciprocating motion. Self-balancing mechanisms are fixedly mounted at both ends of the harvesting blade using crank-rocker arm and movable rod mounting methods. The self-balancing mechanism achieves a fixed axis through a high-speed rotating rotor. The harvester head exhibits a stable orientation when the rotor rotates at high speed without any external torque acting on it. Its axis of rotation remains fixed in inertial space, resisting any force that alters its axial direction. This physical phenomenon is called axial stability. With the assistance of sensor monitoring and feedback to the adjustment system, the harvester head achieves balance. A telescopic mechanism is fixedly installed on the harvester head, using a clamping and welding method. This mechanism adjusts the position of the harvester head through reset, springback, and rotational extension, adapting to changes in its working and non-working states, i.e., changes in the angle between the harvester head and the horizontal plane.

[0009] During operation, the hand-held vegetable harvester's cutting head tilts due to uneven ground, resulting in uneven cuts on vegetables. This is detrimental to market sales and also affects the regrowth of multiple crops. The self-balancing mechanism includes a housing, an outer ring torque converter, an outer ring angle sensor, an outer ring support frame, an inner ring torque converter, an inner ring angle sensor, an inner ring support frame, a rotor, and a drive motor. The housing is fixedly installed at one end of the cutting head using riveting and bonding methods. The housing has a 3 / 4 cylindrical hollow structure to expose the internal parts of the self-balancing mechanism. This achieves connection with the harvesting blade. The outer ring torque device is fixedly installed at the lower end of the housing. The outer ring torque device is used to adjust the torque balance of the self-balancing mechanism in the x-axis direction to ensure stability. The outer ring angle sensor is fixedly installed at the upper end of the housing, and the installation method is set to threaded installation and clamping installation. The outer ring angle sensor is used to detect the angle tilt of the self-balancing device in the x-axis direction for feedback. The outer ring torque device and the outer ring angle sensor are located at the center of the housing. In order to ensure self-balancing in the x-axis direction, the outer ring torque device and the outer ring angle sensor... The sensors should be symmetrically arranged to ensure that the self-balancing mechanism will not cause errors due to its own weight during operation. The inner and outer ring torque converters have arc-shaped through holes in their annular array. These arc-shaped through holes enhance the structural stability of other parts, reduce the weight of the torque converters, thereby reducing motor power and saving energy. The outer ring support frame is fixedly installed inside the housing, using welding and integral casting as installation methods. The inner ring torque converter and inner ring angle sensor are fixedly installed at the midpoints of both sides of the outer ring support frame, using welding and... The inner ring support frame is bolted and fixedly installed at the center of the inner ring torque generator and the inner ring angle sensor. The rotor is fixedly installed in the inner ring support frame. The outer ring support frame and the inner ring support frame adopt a centrally symmetrical structure to ensure that the support frame does not affect the rotor's axis of rotation. Three drive motors are provided and fixedly installed on the outer ring torque generator, the inner ring torque generator, and the rotor, respectively. The drive motors on the rotor have a relatively high power, set to 50W-100W, which can enable the rotor to rotate at 1000r / min-2000r / min.

[0010] The self-balancing device is designed to be as axisymmetric as possible. To avoid additional burden or impact on balance during operation due to differences in the mass of the mechanism itself, the mass on both sides of the self-balancing mechanism along the central axis should be approximately the same, with an error within 3%. In actual manufacturing, if the existing parts that meet the structural requirements have significantly different masses, counterweights can be added to both sides for balancing, under the premise of cost-saving and green manufacturing. It should be noted that the counterweights should be designed as axisymmetrically symmetrical shapes with minimal thickness to ensure the rotor's axial stability. The rotating rod is rotatably mounted at the diagonal intersection of the inner ring support frame, using both bearing rotation and bolt rotation mounting methods. The intersection of the lines is located at the structural center of the inner ring support frame, meaning the rotor should be positioned at the center of gravity of the self-balancing mechanism to maximize its axis-fixing accuracy. The inner and outer rings are sequentially fixed to the outer side of the rotating rod, using a one-piece casting and bonding method. The mass of the outer ring is set to 6-10 times the mass of the inner ring. When the rotor rotates at high speed around the rotating axis, the inner ring is configured as a triangular structure. The inner ring assists in fixing the outer ring to ensure its high-speed rotation stability. Triangular structures offer better stability and facilitate torque dispersion to ensure motion stability. The heavier outer ring, set to 6-10 times the mass of the inner ring, enhances axis-fixing, thereby ensuring the self-balancing effect.

[0011] In the operation of the hand-held vegetable harvester, the most crucial step is the cutting action of the harvesting blade. The harvesting blade comprises a blade body, a movable rod, a fixing block, and a fixing pin. The blade body is fixedly mounted at the front of the frame and features a double-layered serrated design. The reciprocating motion of the upper and lower layers ensures harvesting efficiency and allows the machine to continue working even when the blade edges are not sharp enough, extending its lifespan and ensuring stability in later use. The movable rod is fixedly mounted on both sides of the blade body using welding and riveting. The movable rod is made of wear-resistant chrome steel and is relatively small in size, ensuring a stable connection. The cutter head body and the self-balancing mechanism are made of materials with good wear resistance and high structural strength. The other end of the movable rod is movably mounted on the self-balancing mechanism. The fixed block is fixedly mounted at the center of the cutter head body and is rectangular. Setting it at the center is beneficial for the extension and retraction of the harvesting cutter head. Alternatively, multiple extension and retraction mechanisms can be set and evenly placed on the cutter head body. Although this will increase the cost, it will increase the stability of use to a certain extent. The fixing pin is fixedly mounted on the fixing block and the installation method is snap-fit. The fixing pin is trapezoidal. The trapezoidal structure, which is narrow at the top and wide at the bottom, is beneficial for installation and fixation. Its wider part will lock the fixing block.

[0012] Before using a hand-held vegetable harvester, users typically load it onto a vehicle or push it directly to the work site. Considering that most usage scenarios are in farmland or mountainous areas with poor road conditions and potentially a lot of loose rocks, the harvesting blades need to be retracted via the telescopic mechanism when not in operation. This tilts the blades upwards to prevent them from contacting hard objects during transport, which could reduce their sharpness or even damage them. The telescopic mechanism includes a rotary motor, a knob, a control lever, a return spring, a sliding sleeve element, and a fixing assembly. The sliding sleeve element is fixedly installed at the front of the frame using bolt and welding methods. The fixing assembly is fixedly installed on one side of the lower end of the sliding sleeve element using adhesive and clamping methods. A return spring, made of 65Mn spring material, is fixedly installed inside the sliding sleeve element. Made of spring steel, the control rod is slidably installed inside the sliding sleeve element. The control rod can deform the return spring by 0-3cm, that is, the maximum downward extension against the elastic force of the return spring is 3cm. The knob is fixedly installed on the top of the sliding sleeve element, and the installation method is set as sliding groove installation and snap-on installation. The lower end of the knob is set as a cylinder, and two rectangular protrusions are mirror-symmetrically arranged on both sides of the cylinder. The rectangular protrusions are used to cooperate with the control rod to achieve its extension and retraction effect. When the knob is working, each rotation of 180° causes the two rectangular protrusions to interchange positions. The rotary motor is fixedly installed on the knob. Considering manufacturing cost and installation necessity, the rotary motor can also be omitted. Manual switching can be achieved by setting a cross-shaped thread around the knob, which helps to save costs.

[0013] The main control component of the telescopic mechanism is the control rod. The lower part of the control rod is cylindrical, which is used to contact the harvesting head and provide compression support. In the working state, the contact surface between the two parts is circular, thereby reducing pressure and ensuring service life. The upper part of the control rod is annular, and the radius of the annular ring should be 1.2-1.5 times larger than the circle. Two identical protrusions are symmetrically arranged on its axis, with the protrusions being 5-6 cm higher than the lowest point of the annular ring. The protrusions are used to cooperate with the knob, so that when the knob height is fixed, the control rod deforms under force to compress the return spring, thereby completing the extension and retraction of the control rod. The height difference between the middle of the protrusion and the two sides is 1-2 cm. The middle is concave, which is beneficial for the locking effect. During operation, the hand-held vegetable harvester may experience lateral displacement due to uneven ground, human support, and the operation of the harvesting head. The concave design helps to avoid accidental activation, and prevents the telescopic mechanism from being too sensitive, which would make it inconvenient to use.

[0014] The harvesting blade is mainly fixed on the sliding sleeve element, which includes an inclined surface, a movable groove, a cavity, and a slide rail. The inclined surface, with an angle of 30°-45°, is located below the sliding sleeve element. This inclined surface is used to mount the harvesting blade; the angle ensures stability when mounted on the inclined surface. The movable groove, with an angle of 45°-60°, is located on the inclined surface. This groove provides space for the harvesting blade to retract. A larger angle helps reduce the risk of damage during transportation, but it can also cause instability during operation. The cavity is located in the upper 2 / 3 of the sliding sleeve element, and the slide rail is located in the lower 1 / 3. The cavity houses a return spring, and the slide rail slides in conjunction with the lower part of the control rod. The cross-sectional area of ​​the slide rail is half the cross-sectional area of ​​the cavity. To prevent the slide sleeve element from being used without the operator noticing if the return spring is damaged, the smaller area of ​​the slide rail can lock the control rod in place, preventing it from detaching and causing further damage.

[0015] The telescopic mechanism and the harvesting blade mainly rely on the fixing component to switch between two states under the connection of the control rod and the spring. The fixing component includes a fixing spring, a mounting key, a mounting block, and a keyway. The mounting block is fixedly installed on one side of the lower end of the sliding sleeve element, and the installation method is set to adhesive and welding. The distance between the mounting block and the bottom end of the sliding sleeve element is set to 6-8cm. In order to match the commonly used harvesting blades on the market, the distance is set to 6-8cm, which can ensure that the telescopic work is completed under the action of the fixing spring. A rectangular through hole is opened on the mounting block. The mounting key is set to a trapezoidal shape and fixedly installed in the rectangular through hole. The trapezoidal mounting key has a narrow top and a wide bottom structure, which, together with the rectangular through hole, further improves the stability effect and ensures that the harvesting blade will not fall off due to the fixing component during use, resulting in greater losses. A circular keyway is opened on the mounting key. The fixed spring is installed in the circular keyway, and one end of the fixed spring is fixedly installed in the keyway.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. By setting up a self-balancing mechanism, the harvesting head is horizontally stabilized by utilizing the fixed axis of the rotor during high-speed rotation. The torque device is adjusted by sensing angle changes through sensors to achieve adaptive balance. This ensures that the harvesting head will not tilt due to the inconsistent height of the two drive wheels during the operation of the hand-held vegetable harvester. This ensures work efficiency while achieving flat cuts on crops with minimal cut area, which is beneficial for wound healing of multiple crops, thus maximizing economic value. Flat cuts are also beneficial for later market sales.

[0018] 2. By setting up a telescopic mechanism, the harvesting blade can change its posture according to different states. In the non-working state, the blade is tilted upward to avoid contact with hard objects during transportation, which could reduce the sharpness of the blade or even damage it. A fixed component is set up in conjunction with the telescopic mechanism to ensure that the harvesting blade is stable in both states. On the one hand, this ensures that the harvesting blade will not be damaged during transportation, and on the other hand, it strengthens the structure during operation to ensure harvesting efficiency. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is an overall schematic diagram of the invention;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the self-balancing mechanism, harvesting blade, and telescopic mechanism of the present invention;

[0023] Figure 4 This is a schematic diagram of the self-balancing mechanism of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of the self-balancing mechanism of the present invention;

[0025] Figure 6 This is a schematic diagram of the rotor of the present invention;

[0026] Figure 7 This is a diagram of the harvesting blade of the present invention;

[0027] Figure 8 This is an enlarged view of the harvesting blade of the present invention;

[0028] Figure 9 This is a schematic diagram of the telescopic mechanism of the present invention;

[0029] Figure 10 This is a cross-sectional view of the telescopic mechanism of the present invention;

[0030] Figure 11 This is a schematic diagram of the knob of the present invention;

[0031] Figure 12 This is a schematic diagram of the control lever of the present invention;

[0032] Figure 13This is a schematic diagram of the fixing component of the present invention;

[0033] Figure 14 This is an enlarged view of the fixing component of the present invention.

[0034] In the diagram: 1. Handle; 2. Frame; 3. Wheel; 4. Harvesting blade; 41. Blade body; 42. Movable rod; 43. Fixing block; 44. Fixing pin; 5. Self-balancing mechanism; 51. Housing; 52. Outer ring torque device; 53. Outer ring angle sensor; 54. Outer ring support frame; 55. Inner ring torque device; 56. Inner ring angle sensor; 57. Inner ring support frame; 58. Rotor; 581. Rotating rod; 582. Inner ring; 583. Outer ring; 59. Drive motor; 6. Telescopic mechanism; 61. Rotary motor; 62. Knob; 63. Control rod; 64. Return spring; 65. Sliding sleeve element; 651. Inclined surface; 652. Movable groove; 653. Cavity; 654. Slide rail; 66. Fixing assembly; 661. Fixing spring; 662. Mounting key; 663. Mounting block; 664. Keyway. Detailed Implementation

[0035] The following detailed description is provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding the disclosure of this application. For example, the sequence of operations described herein is merely illustrative and not limited to those stated herein, but may be varied as will become apparent upon understanding the disclosure of this application, except for operations that must occur in a specific order. Furthermore, for increased clarity and conciseness, descriptions of features known in the art may be omitted.

[0036] Example 1: As Figures 1 to 3As shown, a hand-held vegetable harvester includes a handle 1, a frame 2, and wheels 3. Two wheels 3 are mounted on each side of the frame 2, and the wheels 3 should be wide enough to enhance stability when moving on fields and improve maneuverability in complex terrain. The wheels are mounted using bearings. A handle 1 is fixedly mounted on one side of the frame 2 using welding. A rubber sleeve is fitted to the handle 1, designed ergonomically for easy grip, high friction, rainproofing, and slip resistance, ensuring continuous manual control during operation and preventing loss of control and damage to crops, as well as preventing the harvester from tipping over. The frame 2 is made entirely of aluminum alloy, ensuring strength while being lightweight, easy to operate, and inexpensive. A harvesting blade 4 is fixedly mounted at the front of the frame 2 using bolts for easy disassembly and maintenance. The harvesting blade 4 cuts vegetable roots and stems through reciprocating motion. Self-balancing mechanisms are fixedly mounted at both ends of the harvesting blade 4. 5. The installation method is set to the movable rod 42. The self-balancing mechanism 5 obtains the fixed axis through the high-speed rotating parts. When the parts are rotating at high speed, when no external torque is applied to the parts, the direction of the rotation axis of the parts in the inertial space remains stable, that is, it points to a fixed direction. At the same time, it resists any force that changes the axis of the rotor 58. This physical phenomenon is called fixed axis. This principle is also a kind of rotational effect. At the same time, the self-balancing device will also obtain precession. Both of these characteristics are based on the principle of conservation of angular momentum. Therefore, it is necessary to design the balance of the harvesting head 4 with the assistance of the sensor monitoring feedback to the adjustment system. The harvesting head 4 is fixedly installed with a telescopic mechanism 6. The installation method is set to clamp installation. The telescopic mechanism 6 realizes the position change of the harvesting head 4 through reset springback and rotation telescopic, so as to adapt to the changes in the working and non-working states of the harvesting head 4: that is, the angle between the harvesting head 4 and the horizontal changes, so that in the non-working state, it is tilted at a certain angle to protect the harvesting head 4 from damage during transportation.

[0037] like Figures 1 to 5As shown, during the operation of the hand-held vegetable harvester, the uneven ground causes the two wheels 3 to be at different heights, resulting in the harvesting head 4 tilting. This further affects the unevenness of the vegetable cuts, which is detrimental to market sales and also affects the regrowth of multiple crops. For example, chives can quickly heal themselves after being harvested and then grow again, but if the cut is large, the self-healing process may be longer, and the new crop of chives may not grow as well as the previous one. The self-balancing mechanism 5 includes a shell 51, an outer ring torque device 52, an outer ring angle sensor 53, an outer ring support frame 54, an inner ring torque device 55, an inner ring angle sensor 56, an inner ring support frame 57, a rotor 58, and a drive. The motor 59 and housing 51 are fixedly mounted on one end of the harvester head 4 via riveting. The housing 51 is a 3 / 4 cylindrical hollow structure, exposing the internal parts of the self-balancing mechanism 5 for connection with the harvester head 4. An outer ring torque converter 52 is fixedly mounted on the lower end of the housing 51. The outer ring torque converter 52 is used to adjust the torque balance of the self-balancing mechanism 5 in the x-axis direction to ensure stability. An outer ring angle sensor 53 is fixedly mounted on the upper end of the housing 51 via threaded installation. The outer ring angle sensor 53 is used to detect the angular tilt of the self-balancing device in the x-axis direction for feedback. The outer ring angle sensor 53 is located at the center of the outer casing 51. To ensure self-balancing in the x-axis direction, the outer ring torque generator 52 and the outer ring angle sensor 53 should be symmetrically arranged to ensure that the self-balancing mechanism 5 will not cause errors due to its own weight during operation. The outer ring support frame 54 is fixedly installed inside the outer casing 51 by welding. The inner ring torque generator 55 and the outer ring torque generator 52 have arc-shaped through holes in their annular array to reduce the weight of the torque generators, thereby reducing motor power and saving energy. The inner ring torque generator 55 and the inner ring angle sensor 56 are fixedly installed at the midpoints of both sides of the outer ring support frame 54. The installation method is bolted. The inner ring support frame 57 is fixedly installed at the center of the inner ring torquer 55 and the inner ring angle sensor 56. The rotor 58 is fixedly installed in the inner ring support frame 57. The outer ring support frame and the inner ring support frame adopt a centrally symmetrical structure to ensure that the support frame will not affect the rotor's axis of rotation. Three drive motors 59 are set and fixedly installed on the outer ring torquer 52, the inner ring torquer 55 and the rotor 58 respectively. The drive motor 59 on the rotor 58 has a large power, set to 100W, which can enable the rotor 58 to complete a rotation of 2000r / min, thereby providing as much axis of rotation as possible to ensure the horizontality of the harvesting head 4.

[0038] During operation, the drive motor 59 starts, providing high power speed support to the rotor 58, enabling it to achieve horizontal axis stability. As the wheel 3 moves, the uneven ground causes different heights on both sides. The inner ring angle sensor 56 and the outer ring angle sensor 53 detect the angular offsets of the x-axis and y-axis, respectively, and transmit their signals to the calculation system. After calculation, the system issues commands to the drive motor 59 of the outer ring torque converter 52 and the inner ring torque converter 55 to rotate and provide corresponding torque to ensure balance. During this process, the high-speed rotating rotor 58 maintains its axis stability to resist torques in all directions, ensuring stability.

[0039] like Figures 4 to 6 As shown, the self-balancing device is designed to be as axisymmetric as possible. To avoid the difference in mass of the mechanism itself causing additional burden or impact on the balance during operation, the mass on both sides of the self-balancing mechanism 5 along the central axis should be close to the same, with an error guaranteed within 3%. In actual production, if the existing parts that meet the structural requirements have a large difference in mass, under the premise of cost-saving and green manufacturing, counterweights can be set on both sides for balancing. It should be noted that the counterweights should be designed as axisymmetric shapes with a small thickness, such as setting a thin circular sheet and installing it on the inner ring support frame 57 and the outer ring support frame 54 to ensure the axial stability of the rotor 58. The rotating rod 581 is rotatably installed at the diagonal intersection of the inner ring support frame 57, and the installation method is a bearing rotation installation. The friction of the bearing rotation installation is relatively small, which is suitable for long-term movement in this application scenario. The diagonal intersection is located at the structural center point of the inner ring support frame 57, that is, the position of the rotor 58 should be located at the self-balancing point. The center of gravity of the balancing mechanism 5 is positioned to ensure a uniform mass distribution throughout the structure, maximizing the accuracy of its axis fixation. The inner ring 582 and outer ring 583 are fixed to the outer side of the rotating rod 581 in sequence, and the installation method is a one-piece casting. The mass of the outer ring 583 is set to be 8 times the mass of the inner ring 582. The high-quality design of the outer ring 583 helps to strengthen the axis fixation. When the rotor 58 rotates at high speed around the rotating shaft, the mass of the outer ring 583 plays a decisive role. However, an excessively heavy outer ring 583 may cause the rotor 58 to be easily damaged. Considering all factors, a mass ratio of 8:1 between the outer ring 583 and the inner ring 582 is used. The inner ring 582 is designed as a triangular structure. The inner ring 582 assists in fixing the outer ring 583 to ensure its stability during high-speed rotation. Triangles have good stability. The triangular structure can meet the operational requirements while saving materials and ensuring strength, thereby ensuring the dispersion of torque and ensuring motion stability. The heavier outer ring 583 is beneficial to strengthening the axis fixation, thereby ensuring the self-balancing effect.

[0040] like Figure 7 and Figure 8As shown, the most crucial aspect of the hand-held vegetable harvester's operation is the cutting action of the harvesting blade 4. The harvesting blade 4 comprises a blade body 41, a movable rod 42, a fixing block 43, and a fixing pin 44. The blade body 41 is fixedly mounted at the front of the frame 2. The blade body 41 is designed with a double-layered serrated edge, with the upper and lower layers reciprocating to ensure harvesting efficiency. It can continue working even when the blade edge is not sharp enough in certain areas. This design departs from the traditional single-layer blade design, increasing shearing force as an auxiliary force for harvesting, extending the blade's lifespan, and ensuring stability in later use. The movable rod 42 is fixedly mounted on both sides of the blade body 41 using a riveting method. The movable rod 42 is made of wear-resistant chrome steel and is relatively small in size. To ensure its stable connection to the blade body 41 and self-balancing mechanism, the movable rod 42 is designed... Mechanism 5 is made of a material with good wear resistance and high structural strength. The other end of the movable rod 42 is movably mounted on the self-balancing mechanism 5. The fixed block 43 is fixedly mounted at the center of the cutter head body 41 and is rectangular. Setting it at the center is beneficial for the extension and retraction of the harvesting cutter head 4. Alternatively, it can be set as three extension mechanisms 6 evenly and linearly distributed on the cutter head body 41. This approach will increase costs but will increase the stability of use to a certain extent. Considering that the larger harvesting cutter head 4 is heavy, this method of arrangement can be adopted. The fixing pin 44 is fixedly mounted on the fixing block 43 and the installation method is set as snap-fit. The fixing pin 44 is trapezoidal. The trapezoidal structure, which is narrow at the top and wide at the bottom, passes through the fixing block 43, which is beneficial for installation and fixation. Its wider part will clamp the fixing block 43 to ensure the fixation effect.

[0041] like Figure 9 , Figure 10 and Figure 13As shown, before using the hand-held vegetable harvester, users typically load it onto a vehicle or push it directly to the work site. Considering that the usage scenarios are mostly farmland or mountainous areas with poor road conditions and potentially a lot of loose rocks, the harvesting blade 4 may become dull or even damaged after contact with the loose rocks, causing delays for the user, wasting the best time for crop harvesting, and resulting in economic losses. In non-working mode, the harvesting blade 4 needs to be retracted using the telescopic mechanism 6, tilting it upwards to prevent it from contacting hard objects during transport, which could reduce its sharpness or even cause damage. The telescopic mechanism 6 includes a rotary motor 61, a knob 62, a control lever 63, a return spring 64, a sliding sleeve element 65, and a fixing component 66. The sliding sleeve element 65 is fixedly installed at the front of the frame 2 using welding. The fixing component 66 is fixedly installed on one side of the lower end of the sliding sleeve element 65 using adhesive bonding. The return spring 64 is fixedly installed inside the sliding sleeve element 65. Made of 65Mn spring steel, the control lever 63 is slidably installed inside the sliding sleeve element 65. The control lever 63 can deform the return spring 64 by 0-3cm, that is, the maximum downward extension against the elastic force of the return spring 64 is 3cm, and 0cm in the non-working state. The knob 62 is fixedly installed on the top of the sliding sleeve element 65, and the installation method is set as sliding groove installation and snap-on installation. The lower end of the knob 62 is set as a cylinder, and two rectangular protrusions are mirror-symmetrically arranged on both sides of the cylinder. The rectangular protrusions are made of 304 stainless steel to ensure its wear resistance and mechanical strength. The rectangular protrusions are used to cooperate with the control lever 63 to achieve its extension and retraction effect. When the knob 62 is working, each rotation of 180° causes the two rectangular protrusions to interchange positions. The rotary motor 61 is fixedly installed on the knob 62. Considering the manufacturing cost and installation necessity, the rotary motor 61 can also be omitted. The friction can be increased by setting a cross-shaped thread around the knob 62 to achieve manual opening and closing, which is beneficial to saving costs.

[0042] like Figure 10 and Figure 12As shown, the main control component of the telescopic mechanism 6 is the control rod 63. The lower part of the control rod 63 is cylindrical, which is used to contact the harvester head 4 and provide compression support. In the working state, the contact surface between the two parts is circular. The circular structure has strong stability, which can reduce the pressure on the contact surface and ensure service life. The upper part of the control rod 63 is annular, and the radius of the annular ring should be greater than 1.2 times the circle, so as to cooperate with the sliding sleeve element 65 for sliding. Two identical protrusions are symmetrically arranged on its axis. The protrusions are 5cm higher than the lowest point of the annular ring, which are used to coordinate with the knob 62 to achieve the desired effect. A certain displacement is provided to support the harvesting head 4 to complete the work of the telescopic head body 41; the protrusion is used to cooperate with the knob 62 so that when the height of the knob 62 is fixed, the control rod 63 is deformed by force to compress the return spring 64, thereby completing the extension and retraction of the control rod 63. The height difference between the middle of the protrusion and the two sides is 1cm. The middle is set as a concave shape to facilitate the locking effect. During the operation, the hand-held vegetable harvester may have lateral displacement due to uneven ground, human support and the operation of the harvesting head 4. The concave design helps to avoid accidental touch, so that the telescopic mechanism 6 cannot be too sensitive and cause inconvenience in use.

[0043] like Figure 10 As shown, the harvesting head 4 is mainly fixed on the sliding sleeve element 65. The sliding sleeve element 65 includes an inclined surface 651, a movable groove 652, a cavity 653, and a slide rail 654. An inclined surface 651 with an angle of 45° is provided below the sliding sleeve element 65. The 45° inclined surface 651 facilitates the installation of the harvesting head 4, and the 45° angle ensures that the harvesting head 4 is relatively stable when installed on the inclined surface 651. The movable groove 652 is formed on the inclined surface 651, and the angle of the movable groove 652 is set to 60°. The 60° movable groove 652 provides retraction space for the harvesting head 4, and the 60° design helps reduce transportation costs. To mitigate the risk of damage during operation, the cavity 653 is located in the upper two-thirds of the sliding sleeve element 65, and the slide rail 654 is located in the lower one-third of the sliding sleeve element 65. The cavity 653 is used to install and place the return spring 64, and the slide rail 654 is used to slide with the lower part of the control rod 63. The cross-sectional area of ​​the slide rail 654 is half the cross-sectional area of ​​the cavity 653. To prevent the operation from continuing without timely detection by the staff when the return spring 64 is damaged, the smaller area of ​​the slide rail 654 can lock the control rod 63, preventing it from falling off directly and causing further damage.

[0044] like Figure 13 and Figure 14As shown, the telescopic mechanism 6 and the harvesting head 4 mainly rely on the fixing component 66 to switch between two states through the connection of the control rod 63 and the spring. The fixing component 66 includes a fixing spring 661, a mounting key 662, a mounting block 663, and a keyway 664. The mounting block 663 is fixedly installed on one side of the lower end of the sliding sleeve element 65. The installation method is set to adhesive bonding and welding. The distance between the mounting block 663 and the bottom end of the sliding sleeve element 65 is set to 6cm, which can ensure that the telescopic work is completed under the action of the fixing spring 661. The mounting block 663 has an opening on it. A rectangular through hole is provided, and the mounting key 662 is set as a trapezoid with the ratio of the upper and lower side lengths of the trapezoid being 1.2. It is fixedly installed in the rectangular through hole. The trapezoidal mounting key 662 is narrow at the top and wide at the bottom, which, together with the rectangular through hole, further improves the stability effect and ensures that the harvesting head 4 will not fall off due to the fixing component 66 during use, thus preventing greater losses. A circular keyway 664 is provided on the mounting key 662, and a fixing spring 661 is installed in the circular keyway 664. One end of the fixing spring 661 is fixedly installed in the keyway 664.

[0045] During operation, the user holds the handle 1 and pushes the frame 2 forward, assisted by the wheels 3, while the harvesting blade 4 performs the harvesting work. The wheels 3 move on uneven ground, causing inconsistencies in their height. The rotor 58 within the self-balancing mechanism 5 rotates at high speed under the drive of the drive motor 59 to achieve axis stability. The inner ring angle sensor 56 and outer ring angle sensor 53 detect angular deviations and transmit signals to the computing system, which then sends instructions to the drive motor 59. This causes the inner ring torque converter 55 and outer ring torque converter 52 to intervene and reverse, ensuring that the harvesting blade 4 operates in parallel. After harvesting, the rotary motor 61 rotates the knob 62 180°, causing the control lever 63 to move upwards. The fixing component 66 operates, and its fixing spring 661 contracts, allowing the harvesting blade 4 to move within the groove, returning it to a non-working state. The description herein is provided to enable those skilled in the art to implement or use this disclosure.

[0046] Various modifications to this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hand-held vegetable harvester, comprising a handle (1), a frame (2), and wheels (3), wherein the wheels (3) are rotatably mounted on both sides of the frame (2), and the handle (1) is fixedly mounted on one side of the frame (2); characterized in that, A harvesting head (4) is fixedly installed at the front of the frame (2) for cutting vegetable roots and stems through reciprocating motion. A self-balancing mechanism (5) is fixedly installed at both ends of the harvesting head (4). The self-balancing mechanism (5) achieves high-speed rotation of its internal parts in the horizontal axis direction by a motor to obtain a fixed axis. With the assistance of the adjustment system monitored and fed back by the sensor, the horizontal balance of the harvesting head (4) is achieved. A telescopic mechanism (6) is fixedly installed on the harvesting head (4). When the harvesting head (4) is not working, the telescopic mechanism (6) protects the harvesting head (4) through elastic reset and inclined limit. When the harvesting head (4) is working, the mortise and tenon structure is used in conjunction with the locking support structure to strengthen its structural strength and ensure working efficiency.

2. The hand-held vegetable harvester according to claim 1, characterized in that: The self-balancing mechanism (5) includes a housing (51), an outer ring torque generator (52), an outer ring angle sensor (53), an outer ring support frame (54), an inner ring torque generator (55), an inner ring angle sensor (56), an inner ring support frame (57), a rotor (58), and a drive motor (59). The housing (51) is fixedly installed at one end of the harvesting head (4). The housing (51) is configured as a 3 / 4 cylindrical hollow structure. The outer ring torque generator (52) is fixedly installed at the lower end of the housing (51). The outer ring angle sensor (53) is fixedly installed at the upper end of the housing (51). The outer ring torque generator (52) and the outer ring angle sensor (53) are located at the center of the housing (51). The outer ring support frame (54) is fixedly installed at the center of the housing (51). The inner ring torquer (55) and the outer ring torquer (52) are arranged in annular array with arc-shaped through holes. The inner ring torquer (55) and the inner ring angle sensor (56) are fixedly installed at the midpoints of both sides of the outer ring support frame (54). The inner ring support frame (57) is fixedly installed at the center of the inner ring torquer (55) and the inner ring angle sensor (56). The outer ring support frame (54) and the inner ring support frame (57) adopt a centrally symmetrical structure. The rotor (58) is fixedly installed in the inner ring support frame (57). The drive motor (59) is set to three, which are respectively fixedly installed on the outer ring torquer (52), the inner ring torquer (55) and the rotor (58).

3. A hand-held vegetable harvester according to claim 2, characterized in that: The self-balancing mechanism (5) has the same mass on both sides of the central axis; the rotor (58) includes a rotating rod (581), an inner ring (582) and an outer ring (583). The rotating rod (581) is rotatably installed at the intersection of the diagonals of the inner ring support frame (57). The inner ring (582) and the outer ring (583) are fixed to the outside of the rotating rod (581) in sequence. The mass of the outer ring (583) is set to 6-10 times the mass of the inner ring (582).

4. A hand-held vegetable harvester according to claim 1, characterized in that: The harvesting cutter head (4) includes a cutter head body (41), a control rod (63), a fixing block (43), and a fixing pin (44). The cutter head body (41) is fixedly installed in front of the frame (2). The cutter head body (41) is configured as a double-layer sawtooth shape. The control rod (63) is fixedly installed on both sides of the cutter head body (41). The other end of the control rod (63) is movably installed on the self-balancing mechanism (5). The fixing block (43) is fixedly installed at the center of the cutter head body (41). The fixing block (43) is configured as a rectangle. The fixing pin (44) is fixedly installed on the fixing block (43). The fixing pin (44) is configured as a trapezoid.

5. A hand-held vegetable harvester according to claim 1, characterized in that: The telescopic mechanism (6) includes a rotary motor (61), a knob (62), a control rod (63), a return spring (64), a sliding sleeve element (65), and a fixing assembly (66). The sliding sleeve element (65) is fixedly installed in front of the frame (2). The fixing assembly (66) is fixedly installed on one side of the lower end of the sliding sleeve element (65). The return spring (64) is fixedly installed inside the sliding sleeve element (65). The control rod (63) is slidably installed inside the sliding sleeve element (65). The deformation range of the return spring (64) is set to 0-3cm. The knob (62) is fixedly installed on the top of the sliding sleeve element (65). The lower end of the knob (62) is cylindrical. Two rectangular protrusions are mirror-symmetrically arranged on both sides of the cylindrical shape. The rotary motor (61) is fixedly installed on the knob (62).

6. A hand-held vegetable harvester according to claim 5, characterized in that: The lower part of the control rod (63) is cylindrical, and the upper part of the control rod (63) is annular. It has two identical protrusions symmetrically arranged around its axis. The protrusions are 5-6 cm higher than the lowest point of the annular ring, and the height difference between the middle of the protrusions and the two sides is 1-2 cm.

7. A hand-held vegetable harvester according to claim 6, characterized in that: The sliding sleeve element (65) includes an inclined surface (651), a movable groove (652), a cavity (653), and a slide rail (654). The inclined surface (651) with an angle of 30°-45° is provided below the sliding sleeve element (65). The movable groove (652) is opened on the inclined surface (651), and the angle of the movable groove (652) is set to 45°-60°. The cavity (653) is opened in the upper 2 / 3 part of the sliding sleeve element (65). The slide rail (654) is opened in the lower 1 / 3 part of the sliding sleeve element (65). The cross-sectional area of ​​the slide rail (654) is 1 / 2 of the cross-sectional area of ​​the cavity (653).

8. A hand-held vegetable harvester according to claim 6, characterized in that: The fixing component (66) includes a fixing spring (661), a mounting key (662), a mounting block (663), and a keyway (664). The mounting block (663) is fixedly installed on one side of the lower end of the sliding sleeve element (65). The distance between the mounting block (663) and the lower end of the sliding sleeve element (65) is set to 6-8cm. A rectangular through hole is provided on the mounting block (663). The mounting key (662) is set to be trapezoidal and fixedly installed in the rectangular through hole. A circular keyway (664) is provided on the mounting key (662). One end of the fixing spring (661) is fixedly installed in the keyway (664).

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