Handheld farmland mower

Abstract

The invention discloses a handheld farmland mower, and relates to the technical field of mowers, the mower comprises a handheld frame, one end of the handheld frame is provided with an auxiliary strap, the other end of the handheld frame is provided with a protective cover and a motor, the mower further comprises a rotating column and an adjusting mechanism, the rotating column is in transmission connection with the motor, and the outer side of the rotating column is telescopically provided with a cutting rope; the adjusting mechanism is in transmission connection with the rotating column, when the rotating column drives the cutting rope to cut, the cutting rope is passively contracted inwards for cleaning, and meanwhile the cutting rope is rotated by 90 degrees to adjust the cutting face; the rotating column is hollow, is provided with a fixed shaft through a bearing and is connected with the motor through a transmission shaft; the adjusting mechanism comprises a telescopic rod, a rotating gear, a rotating rack, a sliding ball, a sliding rail and the like. And a cleaning sleeve is arranged at the bottom of the protective cover, and a cleaning brush is arranged in the cleaning sleeve. The cutting rope can be automatically cleaned, the cutting face can be automatically adjusted, the cutting efficiency is improved, the service life of parts is prolonged, operation is convenient, mistaken cutting of surrounding crops is reduced, and operation continuity and safety are improved.

Description

Technical Field

[0001] The present invention relates to the technology of lawn mowers, and specifically to a handheld farmland lawn mower. Background Art

[0002] As is known, in agricultural production, farmland mowing is an important daily management task. Handheld farmland lawn mowers are widely used in small farmlands, orchards, vegetable gardens and other scenarios due to their flexible operation, portability and high efficiency. Traditional handheld lawn mowers usually drive a cutting component (such as a cutting blade or a cutting string) to rotate at a high speed through a motor to achieve the cutting operation of weeds. Its structure generally includes a handheld frame, a power device, a cutting component and a protection device, etc., which can meet the basic needs of farmland weeding to a certain extent.

[0003] There are still some deficiencies in the existing handheld farmland lawn mowers. The cutting surface of the cutting component is usually fixed and unchanged, and there will be significant wear on one side during long-term cutting, while there is significant wear on one side of the cutting string and no wear on other sides, resulting in a serious shortening of the service life of the cutting string. After long-term use of the cutting component, the surface is prone to winding of weeds, soil and other sundries, affecting the cutting efficiency and the life of the component, and manual shutdown for cleaning is required, which is inconvenient to operate; at the same time, in addition, during the cutting process of traditional lawn mowers, the cutting range is fixed and cannot be dynamically adjusted according to actual needs, which may cause accidental cutting of surrounding crops, and there is a lack of effective material guiding and cleaning mechanisms, affecting the continuity and safety of the operation. Summary of the Invention

[0004] The purpose of the present invention is to provide a handheld farmland lawn mower to solve the above deficiencies in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: including: a handheld frame for holding the lawn mower for use, one end of the handheld frame is a fixed end and is provided with an auxiliary back strap, and the other end of the handheld frame is a cutting end and is provided with a protective cover and a motor. It also includes:

[0006] A rotating column, which is in transmission connection with the motor and is rotatably installed at the center position of the bottom of the protective cover, and a cutting string is telescopically installed around the outside of the rotating column;

[0007] An adjusting mechanism, which is in transmission connection with the rotating column. During the process of the rotating column driving the cutting string to cut at a high speed, the adjusting mechanism passively retracts the cutting string inward for cleaning, and at the same time passively rotates the cutting string by 90° to adjust the cutting surface of the cutting string.

[0008] As a further description of the above technical solution: The rotating column is hollow inside and a fixed shaft is installed through a bearing. The fixed shaft passes through the rotating shaft through a bearing and fits one end of the motor and is fixedly connected to the inside of the motor. One end of the rotating column is connected to the motor through a fixedly connected transmission shaft, and the hollow transmission shaft drives the rotating column to rotate while keeping the fixed shaft fixed.

[0009] As a further description of the above technical solution: The adjusting mechanism includes a telescopic rod arranged at the installation end of the cutting rope. The bottom end of the telescopic rod is movably inserted into the periphery inside the rotating column through a through hole. A rotating gear is fixedly installed on the outer side of the outer end of the telescopic rod inserted into the rotating column. One side of the rotating gear is detachably meshed with a rotating rack, and the rotating rack is fixedly installed on the inner side wall of the protective cover.

[0010] As a further description of the above technical solution: During each meshing cycle of the rotating rack and the rotating gear, the rotation angle of the rotating gear driven is 90°.

[0011] As a further description of the above technical solution: The adjusting mechanism further includes a sliding ball fixedly installed on the end face of the end of the telescopic rod inserted into the rotating column. The sliding ball is slidably connected in a slide rail, and the slide rail is opened on the surface of the fixed shaft.

[0012] As a further description of the above technical solution: The size inside the slide rail is larger than the size of the sliding ball, and the outer side wall of one side of the slide rail is linearly recessed inward. The positions at both ends of the recess correspond to the state where the cutting rope is contracted in the cleaning sleeve, and the deepest part of the recess corresponds to the rotating rack arranged inside the protective cover.

[0013] As a further description of the above technical solution: A fixed disk is fixedly installed on the surface of the end of the telescopic rod inserted into the rotating column. Positioning cones are fixedly arranged around one side of the fixed disk facing the inner side wall of the rotating column. The positioning cones are detachably inserted into positioning holes, and the positioning holes are correspondingly opened around the through holes opened on the inner side wall of the rotating column.

[0014] As a further description of the above technical solution: A cleaning sleeve is arranged on the bottom of the protective cover close to the hand-held frame side, and a cleaning brush is arranged inside the cleaning sleeve.

[0015] As a further description of the above technical solution: The cleaning sleeve is adapted to the size of the protective cover, and the middle position of the cleaning sleeve protrudes outward to be adapted to the cutting range size of the cutting rope.

[0016] As a further description of the above technical solution: Guide plates that expand outward are arranged at both ends of the cleaning sleeve, and the ends of the guide plates are communicated with the bottom of the middle protruding position inside the cleaning sleeve.

[0017] In the above technical solution, a hand-held farmland lawn mower provided by the present invention has the following beneficial effects:

[0018] 1. Extend the life of the cutting rope: The adjustment mechanism drives the rotating gear through the rotating rack, so that the cutting rope is passively rotated 90° to switch the cutting surface each time it is retracted for cleaning, avoiding excessive wear on a single side, balancing the loss of each side of the cutting rope, and extending the service life.

[0019] 2. Dynamically adjust the cutting range: The cutting rope is retractably installed through a telescopic rod. It automatically extends under the action of centrifugal force to expand the cutting range, and shrinks to narrow the range when entering the cleaning sleeve, reducing the risk of accidental cutting of surrounding crops.

[0020] 3. Passive intelligent adjustment: The adjustment mechanism does not require additional power. Through the centrifugal force of the rotating column and the slide rail structure design, the extension, cleaning and rotation adjustment of the cutting rope are passively realized, which simplifies the mechanical structure and reduces energy consumption.

[0021] 4. Automatic cleaning of cutting rope: When the cutting rope rotates with the rotating column and enters the cleaning sleeve, the cleaning brush in the cleaning sleeve can automatically remove the weeds, soil and other debris entangled on its surface, without the need for manual cleaning, thus improving the convenience of operation and the continuity of operation.

[0022] 5. Material guiding and protection function: The material guiding plate at the bottom of the protective cover can guide the weeds into the cutting range to improve the targeted cutting; the protective cover itself can block the splashes during the cutting process to ensure the safety of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of the combination of the protective cover and the cleaning cover provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the structure of the protective cover and the rotating column assembly provided in an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the structure of a rotating column provided in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the structure of a rotating gear provided by an embodiment of the present invention;

[0029] Figure 6Schematic structural diagram of the slide rail provided by the embodiment of the present invention;

[0030] Figure 7 Schematic structural diagram of the connection between the motor drive shaft and the rotating column provided by the embodiment of the present invention;

[0031] Figure 8 Schematic structural diagram of the cleaning sleeve provided by the embodiment of the present invention;

[0032] Figure 9 Schematic structural diagram of the fixed disk provided by the embodiment of the present invention;

[0033] Figure 10 Schematic structural diagram of the installation of the fixed shaft inside the rotating column provided by the embodiment of the present invention.

[0034] Explanation of reference numerals:

[0035] 1 - Handheld frame; 2 - Auxiliary strap; 3 - Motor; 4 - Protective cover; 5 - Cleaning sleeve; 6 - Feeding plate; 7 - Cutting rope; 8 - Rotating column; 9 - Fixed shaft; 10 - Rotating gear; 11 - Telescopic rod; 12 - Fixed disk; 13 - Slide rail; 14 - Through hole; 15 - Slide ball; 16 - Rotating rack; 17 - Positioning cone; 18 - Positioning hole; 20 - Bearing; 21 - Drive shaft. Detailed implementation manners

[0036] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Please refer to Figures 1-10 , the embodiment of the present invention provides a technical solution for a handheld farm mower: including: a handheld frame 1 for holding the mower for use, one end of the handheld frame 1 is a fixed end provided with an auxiliary strap 2, the other end of the handheld frame 1 is a cutting end and is provided with a protective cover 4 and a motor 3, and further includes:

[0038] A rotating column 8, which is in transmission connection with the motor 3 and is rotatably installed at the center position of the bottom of the protective cover 4, and a cutting rope 7 is telescopically installed around the outer side of the rotating column 8;

[0039] An adjusting mechanism, which is in transmission connection with the rotating column 8. During the process of the rotating column 8 driving the cutting rope 7 to cut at high speed, the adjusting mechanism passively contracts the cutting rope 7 inward for cleaning, and at the same time passively rotates the cutting rope 7 by 90° to adjust the cutting surface of the cutting rope 7.

[0040] In still another embodiment provided by the present invention, preferably, the adjusting mechanism includes a telescopic rod 11 provided at the mounting end of the cutting rope 7. The bottom end of the telescopic rod 11 is movably inserted through a through hole 14 around the inside of the rotating column 8. A rotating gear 10 is fixedly installed on the outer side of one end of the telescopic rod 11 inserted outside the rotating column 8. One side of the rotating gear 10 is detachably meshed with a rotating rack 16, and the rotating rack 16 is fixedly installed on the inner side wall of the protective cover 4.

[0041] In still another embodiment provided by the present invention, the adjusting mechanism further includes a sliding ball 15 fixedly installed on the end face of the end of the telescopic rod 11 inserted into the rotating column 8. The sliding ball 15 is slidably connected in a slide rail 13, and the slide rail 13 is opened on the surface of the fixed shaft 9.

[0042] In still another embodiment provided by the present invention, the inside of the rotating column 8 is hollow and a fixed shaft 9 is installed through a bearing 20. The fixed shaft 9 passes through the bearing 20 through the rotating shaft and fits one end of the motor 3 and is fixedly connected to the inside of the motor 3. One end of the rotating column 8 is connected to the motor 3 through a fixedly connected transmission shaft 21, so that while the hollow transmission shaft 21 rotates to drive the rotating column 8 to rotate, the fixed shaft 9 is kept fixed.

[0043] In still another embodiment provided by the present invention, within each meshing cycle of the rotating rack 16 with the rotating gear 10, the rotation angle of the rotating gear 10 driven is 90°.

[0044] In still another embodiment provided by the present invention, the size inside the slide rail 13 is larger than the size of the sliding ball 15, and the outer side wall of one side of the slide rail 13 is linearly recessed inward. The positions at both ends of the recess correspond to the state where the cutting rope 7 is retracted into the cleaning sleeve 5, and the deepest part of the recess corresponds to the rotating rack 16 provided inside the protective cover 4.

[0045] In still another embodiment provided by the present invention, a fixed disk 12 is fixedly installed on the surface of the end of the telescopic rod 11 inserted into the rotating column 8. Around the periphery of the side of the fixed disk 12 facing the inner side wall of the rotating column 8, positioning cones 17 are fixedly provided. The positioning cones 17 are detachably inserted into positioning holes 18, and the positioning holes 18 are correspondingly opened around the through holes 14 opened on the inner side wall of the rotating column 8.

[0046] In still another embodiment provided by the present invention, a cleaning sleeve 5 is provided at the bottom of the protective cover 4 near the hand-held frame 1, and a cleaning brush is provided inside the cleaning sleeve 5.

[0047] In still another embodiment provided by the present invention, the cleaning sleeve 5 is adapted to the size of the protective cover 4, and the convex position in the middle of the cleaning sleeve 5 is adapted to the size protruding outward from the cutting range of the cutting rope 7.

[0048] In still another embodiment provided by the present invention, preferably, guide plates 6 that expand outward are provided at both ends of the cleaning sleeve 5, and the ends of the guide plates 6 communicate with the bottom of the outwardly protruding position in the middle section inside the cleaning sleeve 5.

[0049] During use, after the operator fixes the auxiliary strap 2 on the shoulder, he holds the hand-held frame 1 with his hand to control the start and stop of the lawn mower, and starts the lawn mower for use;

[0050] During the process of mowing the lawn with the lawn mower, the starting motor 3 drives the rotating column 8 to rotate at high speed through the hollow transmission shaft 21, thereby driving the four groups of cutting ropes 7 installed around the outside of the rotating column 8 to rotate at high speed, so as to cut the weeds in the farmland. During the cutting process, in order to prevent the weeds cut by the high-speed rotation of the motor 3 or other items that are brought up and splashed from causing harm to the cutting operator, a protective cover 4 is installed between the motor 3 and the cutting rope 7. At the same time, in order to prevent the cutting rope 7 from cutting the crops in the farmland, guide plates 6 are provided at both ends of the bottom of the protective cover 4, and the tops of the guide plates 6 are used to gather the weeds into the cutting range of the cutting rope 7, so as to cut the weeds;

[0051] At the same time, during the cutting process, the high-speed rotation inside the motor 3 drives the rotating column 8 inserted into the center position of the bottom of the protective cover 4 through the bearing 20 to rotate at high speed through the hollow transmission shaft 21. The high-speed rotation of the rotating column 8 drives the four groups of cutting ropes 7 installed around it to rotate at high speed to achieve the cutting of weeds;

[0052] The bottom end of the cutting rope 7 is movably inserted into the inner circumference of the rotating column 8 through the telescopic rod 11. When the rotating column 8 rotates at high speed, under the action of centrifugal force, the cutting rope 7 will drive the telescopic rod 11 to extend outward from the rotating column 8, thereby extending the cutting range of the cutting rope 7. And during this process, the cutting rope 7 will have four states:

[0053] The first state: The cutting rope 7 is exposed outside the cleaning sleeve 5 to cut the weeds in the farmland. At this time, the cutting distance of the cutting rope 7 reaches the maximum state. At this time, the sliding ball 15 provided at the bottom end of the telescopic rod 11 connected to the bottom end of the cutting rope 7 is located at the position where it fits the outer wall inside the slide rail 13 on the surface of the rotating column 8. At this time, the telescopic rod 11 is inserted into the surface of the fixed disk 12 provided on the inner and outer sides of the rotating column 8 and fits against the inner wall of the rotating column 8, and the positioning cones 17 provided around the surface of the fixed disk 12 are inserted into the positioning holes 18 correspondingly opened on the inner wall of the rotating column 8. And the telescopic rod 11 is swung outward by the centrifugal force of high-speed rotation to reach the limit position of the outward extension of the cutting rope 7 and is fixed. At the same time, the position of the cutting rope 7 can also be fixed, so that the cutting rope 7 can maintain fixed cutting during the cutting process and will not rotate freely;

[0054] In the second state, the cutting rope 7 rotates into the cleaning sleeve 5. When the cutting rope 7 starts to enter the cleaning sleeve 5, the sliding ball 15 at the bottom end of the telescopic rod 11 begins to enter the slide rail 13. During this process, the sliding ball 15 will fit into the slide rail 13 and contract the telescopic rod 11 into the rotating column 8 as the depth of the slide rail 13 changes. The positioning cone 17 will pop out of the positioning hole 18 and lose the limit on the telescopic rod 11 until the sliding ball 15 reaches the middle position inside the slide rail 13. At this time, the telescopic rod 11 contracts into the rotating column 8 to the maximum extent, and the inward contraction amplitude of the cutting rope 7 also reaches the maximum. At this time, the cutting rope 7 is in the shortest cutting range, and the cutting rope 7 contracts inward and is inserted into the middle position inside the cleaning sleeve 5. And the rotating gear 10 on the outside of the rotating column 8 where the telescopic rod 11 is inserted reaches the position of the rotating rack 16 provided on the inner side wall of the protective cover 4;

[0055] In the third state, the rotating column 8 continues to rotate, and the rotating gear 10 meshes and rotates on the surface of the rotating rack 16. The setting of the rotating rack 16 can drive the telescopic rod 11 to drive the cutting rope 7 to rotate by 90°, so as to rotate and switch the cutting surface of the cutting rope 7 by 90°. At this time, since the positioning cone 17 on the surface of the fixed disk 12 is separated from the positioning hole 18, and the sliding ball 15 is a spherical and rotatable slide in the slide rail 13, the telescopic rod 11 can rotate freely;

[0056] In the fourth state, the rotating column 8 continues to rotate to separate the rotating gear 10 from the rotating rack 16 and rotate the cutting rope 7 out of the cleaning sleeve 5. At this time, the sliding ball 15 slides from the middle position in the slide rail 13 to the inwardly concave end position and continues to slide to the initial position where the slide rail 13 is inwardly concave. The sliding ball 15 loses the restriction of the slide rail 13 in the slide rail 13 and is affected by the centrifugal force, pops the telescopic rod 11 out of the rotating column 8, and inserts the positioning cone 17 on the surface of the fixed disk 12 into the positioning hole 18 to fix the position of the telescopic rod 11, so as to completely extend the cutting rope 7 outwards to cut weeds.

[0057] It should be noted that the inside of the transmission shaft 21 is hollow and can rotatably insert the fixed shaft 9 to ensure that the transmission shaft 21 can rotate while the fixed shaft 9 will not rotate with the rotation of the transmission shaft 21. At the same time, the transmission shaft 21 will drive the rotating column 8 to rotate at a high speed, and the fixed shaft 9 will be rotatably inserted into the rotating column 8 through the bearing 20, so as to fix the fixed shaft 9 while the rotating column 8 rotates and will not rotate with the rotation of the rotating column 8, so as to ensure that the sliding ball 15 at the bottom end of the telescopic rod 11 will slide in the slide rail 13 while rotating and drive the change of the position of the telescopic rod 11 as the depth of the slide rail 13 changes;

[0058] When the cutting rope 7 is rotationally inserted into the cleaning sleeve 5, the cutting rope 7 will be brushed and cleaned on its surface by the brush provided in the cleaning sleeve 5, thereby preventing sundries during cutting from winding around the cutting rope 7 and affecting the cutting use of the cutting rope 7;

[0059] Meanwhile, when the cutting rope 7 is retracted into the cleaning sleeve 5, due to its own length, the cutting rope 7 will be rotated into the cleaning sleeve 5 through the guiding of the material guiding plate 6. When the cutting rope 7 is inside the cleaning sleeve 5, the tip part will have the sundries wound on the surface of the cutting rope 7 fished out and cleaned outward by the brush in the cleaning sleeve 5 along the rotation direction of the cutting rope 7.

[0060] Overall structure and working principle:

[0061] The present invention provides a handheld farm mower. As shown in the figure, it includes a handheld frame 1, a motor 3, a rotating column 8, a cutting rope 7 and an adjusting mechanism. One end (fixed end) of the handheld frame 1 is provided with an auxiliary shoulder strap 2, and the other end (cutting end) is installed with a protective cover 4 and a motor 3. The rotating column 8 is in transmission connection with the motor 3 and is rotatably installed at the center of the bottom of the protective cover 4. The cutting rope 7 is telescopically installed around its outer side through a telescopic rod 11; the adjusting mechanism is linked with the rotating column 8 to passively realize the retraction and cleaning of the cutting rope 7 and the rotation adjustment of the cutting surface during the cutting process.

[0062] Structure of key components:

[0063] Transmission connection between the rotating column 8 and the motor 3:

[0064] The inside of the rotating column 8 is hollow, and the fixed shaft 9 is installed and fixed through a bearing 20. One end of the fixed shaft 9 penetrates through the rotating column 8 and is fixedly connected to the inside of the motor 3, and the other end is fixed to the protective cover 4 through a bearing 20 to ensure that the fixed shaft 9 remains stationary. The motor 3 drives the rotating column 8 to rotate through a hollow transmission shaft 21, realizing the transmission relationship of "the rotation of the transmission shaft 21 drives the rotation of the rotating column 8, while the fixed shaft 9 remains stationary".

[0065] Specific structure of the adjusting mechanism:

[0066] Telescopic and rotating assembly: The cutting rope 7 is installed on the outer side of the rotating column 8 through a telescopic rod 11. The bottom end of the telescopic rod 11 passes through the through hole 14 on the side wall of the rotating column 8 and extends to the inside, and its end is fixed with a sliding ball 15. The sliding ball 15 is slidably matched with the sliding rail 13 on the surface of the fixed shaft 9. One inner wall of the sliding rail 13 is linearly recessed. The two ends of the recess correspond to the fully extended (working state) and fully retracted (cleaning state) of the cutting rope 7, and the deepest part of the recess corresponds to the position of the rotating rack 16 inside the protective cover 4.

[0067] Rotating adjustment component: A rotating gear 10 is fixed on the outer side of the exposed end of the telescopic rod 11, and a rotating rack 16 is fixed on the inner side wall of the protective cover 4. The two are detachably meshed. The rotating rack 16 is designed to drive the rotating gear 10 to rotate 90° each time, so as to make the cutting rope 7 rotate to switch the cutting surface.

[0068] Positioning component: The inner end of the telescopic rod 11 is fixedly connected with a fixed disk 12, and positioning cones 17 are arranged circumferentially thereon, which are detachably inserted into the positioning holes 18 on the inner wall of the rotating column 8 for locking the extended state of the cutting rope 7.

[0069] Cleaning function component:

[0070] A cleaning sleeve 5 is provided on the bottom of the protective cover 4 close to the hand-held frame 1, and a cleaning brush is installed inside. The size of the cleaning sleeve 5 is adapted to that of the protective cover 4, the middle part bulges outwards and is larger than the maximum cutting range of the cutting rope 7, and guide plates 6 are arranged at both ends, and the ends thereof communicate with the bottom of the middle part of the cleaning sleeve 5 to guide the cutting rope 7 into the cleaning sleeve 5 and comb sundries.

[0071] Working process and state switching:

[0072] Initial working state:

[0073] After starting the motor 3, the hollow transmission shaft 21 drives the rotating column 8 to rotate at a high speed, and the cutting rope 7 drives the telescopic rod 11 to extend outwards under the action of centrifugal force. At this time:

[0074] The sliding ball 15 is located on the outer side wall of the sliding rail 13, the positioning cone 17 of the fixed disk 12 is inserted into the positioning hole 18 to lock the position of the telescopic rod 11, and the cutting rope 7 is completely exposed outside the cleaning sleeve 5 with the maximum cutting range;

[0075] The cutting rope 7 rotates at a high speed to cut weeds, the protective cover 4 prevents flying objects from hurting the operator, and the guide plate 6 guides the weeds into the cutting range.

[0076] Cleaning and adjustment state:

[0077] When the cutting rope 7 rotates with the rotating column 8 to the position of the cleaning sleeve 5:

[0078] Shrinking and cleaning stage: The sliding ball 15 enters the concave area of the sliding rail 13, drives the telescopic rod 11 to contract towards the inside of the rotating column 8 as the depth of the sliding rail 13 changes, the positioning cone 17 disengages from the positioning hole 18, the cutting rope 7 shortens and enters the cleaning sleeve 5, and the cleaning brush removes the sundries on its surface;

[0079] Rotating adjustment stage: The rotating gear 10 at the exposed end of the telescopic rod 11 meshes with the rotating rack 16 inside the protective cover 4, and the rotating column 8 continues to rotate to drive the rotating gear 10 to rotate 90°, driving the cutting rope 7 to switch the cutting surface.

[0080] Reset working state:

[0081] The rotating column 8 continues to rotate, the rotating gear 10 separates from the rotating rack 16, the sliding ball 15 disengages from the recessed area of the slide rail 13, the centrifugal force throws the telescopic rod 11 outwards again, the positioning cone 17 is reinserted into the positioning hole 18, and the cutting rope 7 fully extends, entering the cutting state of the next cycle.

[0082] Transmission and fixing mechanism:

[0083] The fixed shaft 9 is rotationally connected to the rotating column 8 through the bearing 20, ensuring that the fixed shaft 9 remains stationary when the rotating column 8 rotates at a high speed, so that the sliding of the sliding ball 15 in the slide rail 13 is only controlled by the centrifugal force and the shape of the slide rail 13, realizing the passive telescoping and rotation of the telescopic rod 11.

[0084] Only some exemplary embodiments of the present invention have been described by way of illustration above. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A handheld farmland mower, comprising: A handheld frame (1) for hand-held use of a lawn mower, wherein one end of the handheld frame (1) is a fixed end and is provided with an auxiliary shoulder strap (2), and the other end of the handheld frame (1) is a cutting end and is provided with a protective cover (4) and a motor (3), and is characterized in that it also includes: A rotating column (8), the rotating column (8) being transmission-connected to the motor (3) and rotatably mounted at the bottom center of the protective cover (4), and a cutting rope (7) being telescopically mounted around the outer periphery of the rotating column (8); An adjusting mechanism is transmission-connected to the rotating column (8). When the rotating column (8) rotates at a high speed to drive the cutting rope (7) to be cut, the adjusting mechanism passively retracts the cutting rope (7) inwards for cleaning, and passively rotates the cutting rope (7) by 90 degrees to adjust the cutting surface of the cutting rope (7).

2. A handheld farmland mower according to claim 1, characterized in that: The rotating column (8) is hollow inside and is provided with a fixed shaft (9) via a bearing (20). The fixed shaft (9) passes through the rotating shaft through the bearing (20) and is attached to one end of the motor (3) and is fixedly connected to the inside of the motor (3). One end of the rotating column (8) is connected to the motor (3) via a fixedly connected transmission shaft (21). The rotating column (8) is driven to rotate by the hollow transmission shaft (21) while the fixed shaft (9) is kept fixed.

3. The handheld farmland mower according to claim 1, characterized in that: The adjustment mechanism comprises a telescopic rod (11) arranged at the mounting end of the cutting rope (7), the bottom end of the telescopic rod (11) being movably plugged into the periphery of the rotating column (8) through a through hole (14), a rotating gear (10) being fixedly mounted on the outer side of one end of the telescopic rod (11) plugged into the rotating column (8), one side of the rotating gear (10) being detachably meshed with a rotating rack (16), and the rotating rack (16) being fixedly mounted on the inner side wall of the protective cover (4).

4. A handheld farmland mower according to claim 3, characterized in that: During each meshing cycle between the rotating rack (16) and the rotating gear (10), the rotating gear (10) is driven to rotate by 90°.

5. The handheld farmland mower according to claim 1, characterized in that: The adjustment mechanism also includes a sliding ball (15) fixedly mounted on the end surface of one end of the telescopic rod (11) inserted into the rotating column (8), the sliding ball (15) being slidably connected in a sliding rail (13), and the sliding rail (13) is provided on the surface of the fixed shaft (9).

6. A handheld farmland mower according to claim 5, characterized in that: The size of the slide rail (13) is larger than the size of the slide ball (15), and the outer wall of one side of the slide rail (13) is linearly recessed inward, and the positions of the two ends of the recess correspond to the state in which the cutting rope (7) is contracted in the cleaning sleeve (5), and the deepest point of the recess corresponds to the rotating rack (16) provided in the protective cover (4).

7. The handheld farmland mower according to claim 5, characterized in that: The telescopic rod (11) is inserted into the inner surface of one end of the rotating column (8) and fixedly mounted with a fixing plate (12). The fixing plate (12) is fixedly provided with a positioning cone (17) on the periphery of a side facing the inner wall of the rotating column (8). The positioning cone (17) is detachably inserted into a positioning hole (18). The positioning hole (18) is correspondingly provided around a through hole (14) provided on the inner wall of the rotating column (8).

8. The handheld farmland mower according to claim 1, characterized in that: A cleaning sleeve (5) is provided at the bottom of the protective cover (4) close to the handheld frame (1), and a cleaning brush is provided inside the cleaning sleeve (5).

9. The handheld farmland mower according to claim 8, characterized in that: The cleaning sleeve (5) is adapted to the size of the protective cover (4), and the middle portion of the cleaning sleeve (5) protrudes outwards and is adapted to the size of the cutting range of the cutting rope (7).

10. The handheld farmland mower according to claim 9, characterized in that: Outwardly expanding material guide plates (6) are provided at both ends of the cleaning sleeve (5), and the ends of the material guide plates (6) are connected to the bottom of the outwardly protruding position of the middle section of the cleaning sleeve (5).

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