A hand-held field mower

Abstract

The application discloses a handheld farmland mower, and relates to the technical field of mowers.The mower comprises a handheld frame, an auxiliary back strap arranged at one end of the handheld frame, a protective cover and a motor arranged at the other end of the handheld frame, a rotating column and an adjusting mechanism.The rotating column is in transmission connection with the motor, and a cutting rope is arranged on the outer side of the rotating column in a telescopic mode.The adjusting mechanism is in transmission connection with the rotating column, and can passively shrink the cutting rope inward to clean the cutting rope and rotate the cutting rope by 90 DEG to adjust a cutting surface when the cutting rope is cut by the rotating column.The rotating column is hollow, a fixed shaft is arranged in the rotating column through a bearing, and the motor is connected with the fixed shaft through a transmission shaft.The adjusting mechanism comprises a telescopic rod, a rotating gear, a rotating rack, a sliding ball, a sliding rail and other components.A cleaning sleeve is arranged at the bottom of the protective cover, a cleaning brush is arranged in the cleaning sleeve, and guide plates are arranged at both ends of the cleaning sleeve.The application can automatically clean the cutting rope, adjust the cutting surface, improve the cutting efficiency and the service life of components, is convenient to operate, reduces the cutting of surrounding crops, and improves the operation continuity and safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the lawn mower technology, specifically to a handheld farmland mower. BACKGROUND

[0002] It is known that in agricultural production, farmland mowing is an important daily management work. The handheld farmland mower is widely used in small farmland, orchard, vegetable garden and other scenes due to its flexible operation, portability and high efficiency. The traditional handheld mower generally drives the cutting component (such as cutting blade or cutting rope) to rotate at high speed by the motor to realize the cutting operation of weeds. Its structure generally includes a handheld frame, a power device, a cutting component and a protective device, which can meet the basic needs of farmland weeding to a certain extent.

[0003] The existing handheld farmland mower still has some deficiencies. The cutting surface of the cutting component is usually fixed and cannot be changed. After a long time of cutting, the single side of the cutting component will be severely worn, and the cutting rope will be severely worn on one side and not worn on the other side, which will seriously shorten the service life of the cutting rope. After a long time of use, the surface of the cutting component is easily entangled with weeds, soil and other sundries, which affects the cutting efficiency and the service life of the component, and manual cleaning is required, which is inconvenient to operate. In addition, the cutting range of the traditional mower is fixed during cutting and cannot be dynamically adjusted according to actual needs, which may cause mis-cutting of the surrounding crops, and lacks effective material guiding and cleaning mechanism, which affects the continuity and safety of the operation. SUMMARY

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

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: including: a handheld frame for handheld use of the mower, one end of the handheld frame is a fixed end and is provided with an auxiliary shoulder strap, the other end of the handheld frame is a cutting end and is provided with a protective cover and a motor, further comprising:

[0006] A rotating column is drivingly connected between the motor and rotatably installed at the center position of the bottom of the protective cover. The rotating column is provided with a cutting rope which is telescopically installed around the outer side of the rotating column.

[0007] An adjusting mechanism is drivingly connected between the rotating column. During the process of high-speed rotation of the rotating column to drive the cutting rope to cut, the adjusting mechanism passively shrinks the cutting rope inward for cleaning, and passively rotates the cutting rope by 90° to adjust the cutting surface of the cutting rope.

[0008] As a further description of the above technical solution: the rotating column is hollow and has a fixed shaft installed through a bearing, the fixed shaft penetrates the motor end through the bearing 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 rotates to drive 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 cutting rope mounting end, the bottom end of the telescopic rod is movably inserted into the rotating column around, a rotating gear is fixedly installed outside the outer end of the telescopic rod inserted into the rotating column, one side of the rotating gear is detachably meshed and connected 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: the rotating rack drives the rotating gear to rotate by 90° in each meshing period of the rotating gear.

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

[0012] As a further description of the above technical solution: the size of the sliding rail is greater than that of the sliding ball, and the outer side wall of one side of the sliding rail is linearly recessed inward, the positions of the recessed two ends correspond to the state that the cutting rope is retracted in the cleaning sleeve, and the deepest part of the recess corresponds to the position of the rotating rack arranged in the protective cover.

[0013] As a further description of the above technical solution: a fixed disc is fixedly installed on the surface of one end of the telescopic rod inserted into the rotating column, positioning cones are fixedly arranged around one side of the inner side wall of the rotating column facing the fixed disc, the positioning cones are detachably inserted into positioning holes, and the positioning holes are correspondingly arranged around the through holes arranged 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 side close to the hand-held frame at the bottom of the protective cover, and a cleaning brush is arranged in the cleaning sleeve.

[0015] As a further description of the above technical solution: the size of the cleaning sleeve is matched with the size of the protective cover, and the outward protruding position of the middle part of the cleaning sleeve is matched with the size of the cutting range of the cutting rope.

[0016] As a further description of the above technical solution: outwardly expanding guide plates are arranged at both ends of the cleaning sleeve, and the guide plates are connected to the bottom of the outward protruding position of the middle part of the cleaning sleeve.

[0017] In the above technical solution, the hand-held agricultural field mower provided by the application has the following beneficial effects:

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

[0019] 2. Dynamic adjustment of cutting range: the cutting rope is installed through a telescopic rod, which automatically extends to expand the cutting range under the action of centrifugal force, and retracts to reduce the range when entering the cleaning sleeve, reducing the risk of mis-cutting surrounding crops.

[0020] 3. Automatic cleaning of the cutting rope: when the cutting rope rotates with the rotating column into the cleaning sleeve, the cleaning brush inside the cleaning sleeve can automatically remove weeds, dirt and other debris wrapped on its surface, without the need for manual shutdown cleaning, improving operation convenience and operation continuity.

[0021] 4. Material guiding and protection function: the material guiding plate at the bottom of the protective cover can guide weeds into the cutting range, improving the cutting specificity; the protective cover itself can block splashes during cutting to protect the operator's safety. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0023] Figure 1 The overall structure schematic diagram provided for the embodiments of the present application;

[0024] Figure 2 The structure schematic diagram of the combination between the protective cover and the cleaning sleeve provided for the embodiments of the present application;

[0025] Figure 3 The structure schematic diagram of the assembly of the protective cover and the rotating column provided for the embodiments of the present application;

[0026] Figure 4 The structure schematic diagram of the rotating column provided for the embodiments of the present application;

[0027] Figure 5 The structure schematic diagram of the rotating gear provided for the embodiments of the present application;

[0028] Figure 6 The structure schematic diagram of the sliding rail provided for the embodiments of the present application;

[0029] Figure 7 The structure schematic diagram of the connection between the motor transmission shaft and the rotating column provided for the embodiments of the present application;

[0030] Figure 8 The structure schematic diagram of the cleaning sleeve provided by the embodiment of the present application is shown in the figure.

[0031] Figure 9 The structure schematic diagram of the fixing disc provided by the embodiment of the present application is shown in the figure.

[0032] Figure 10 The structure schematic diagram of the fixing shaft installed in the rotating column is shown in the figure.

[0033] Explanation of reference signs:

[0034] 1-handheld frame; 2-assistant back strap; 3-motor; 4-protective cover; 5-cleaning sleeve; 6-guiding plate; 7-cutting rope; 8-rotating column; 9-fixing shaft; 10-rotating gear; 11-telescopic rod; 12-fixing disc; 13-sliding rail; 14-through hole; 15-sliding ball; 16-rotating rack; 17-positioning cone; 18-positioning hole; 20-bearing; 21-transmission shaft. DETAILED DESCRIPTION

[0035] In order to make the skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0036] Please refer to Figures 1-10 The technical scheme of the handheld agricultural mower provided by the embodiment of the present application is shown in the figure.

[0037] The rotating column 8 is transmissionally connected between the motor 3 and the rotating column 8 and is rotatably installed at the bottom center position of the protective cover 4, and the cutting rope 7 is telescopically installed around the outside of the rotating column 8.

[0038] The adjusting mechanism is transmissionally connected between the rotating column 8, and in the process of high-speed rotation of the rotating column 8 driving the cutting rope 7 to cut, the adjusting mechanism passively shrinks the cutting rope 7 inward for cleaning, and simultaneously passively rotates the cutting rope 7 by 90° to adjust the cutting surface of the cutting rope 7.

[0039] In another embodiment of the present application, preferably, the adjusting mechanism includes the telescopic rod 11 arranged at the installation end of the cutting rope 7, the bottom end of the telescopic rod 11 is movably inserted into the rotating column 8 around the outside, the telescopic rod 11 is fixedly installed at one end outside of the rotating column 8, the rotating gear 10 is fixedly installed at the outside of the rotating column 8, the rotating gear 10 is detachably meshed with the rotating rack 16 on one side, and the rotating rack 16 is fixedly installed on the inner wall of the protective cover 4.

[0040] In still another embodiment of the present application, the adjusting mechanism further comprises a sliding ball 15 fixedly installed on the end surface of the telescopic rod 11 inserted into the rotating column 8, the sliding ball 15 being slidingly connected in the sliding rail 13 opened on the surface of the fixed shaft 9.

[0041] In still another embodiment of the present application, the rotating column 8 is hollow and the fixed shaft 9 is installed in the rotating column 8 through the bearing 20, the fixed shaft 9 penetrating through the rotating shaft and fixedly connected to the inside of the motor 3 through the bearing 20, one end of the rotating column 8 being connected to the motor 3 through the fixedly connected transmission shaft 21, the hollow transmission shaft 21 rotating to drive the rotating column 8 to rotate while keeping the fixed shaft 9 fixed.

[0042] In still another embodiment of the present application, the rotation angle of the rotating gear 10 driven by the rotation rack 16 in each meshing period is 90°.

[0043] In still another embodiment of the present application, the size of the sliding rail 13 is greater than that of the sliding ball 15, and the outer side wall of one side of the sliding rail 13 is linearly recessed inward, the recessed positions of both ends corresponding to the state that the cutting rope 7 is retracted in the cleaning sleeve 5, and the deepest part of the recess corresponding to the rotation rack 16 arranged in the protective cover 4.

[0044] In still another embodiment of the present application, the fixed disc 12 is fixedly installed on the end surface of the telescopic rod 11 inserted into the rotating column 8, the fixed disc 12 being fixedly arranged around one side of the inner side wall of the rotating column 8, the positioning cone 17 being separably inserted into the positioning hole 18, and the positioning hole 18 being correspondingly opened around the through hole 14 opened on the inner side wall of the rotating column 8.

[0045] In still another embodiment of the present application, the cleaning sleeve 5 is arranged on the side of the cleaning sleeve 5 close to the hand-held frame 1, and the cleaning brush is arranged in the cleaning sleeve 5.

[0046] In still another embodiment of the present application, the size of the cleaning sleeve 5 is matched with that of the protective cover 4, and the outward protruding position of the middle part of the cleaning sleeve 5 is matched with the cutting range of the cutting rope 7.

[0047] In still another embodiment of the present application, preferably, the cleaning sleeve 5 is provided with the outwardly expanding guide plate 6 at both ends, and the end of the guide plate 6 is communicated with the bottom of the outward protruding position of the middle part of the cleaning sleeve 5.

[0048] In use, after the auxiliary belt 2 is fixed on the shoulders, the person holds the hand-held frame 1 to control the start and stop of the mower, and starts the mower for use.

[0049] In the process of mowing with the 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 sets of cutting ropes 7 installed around the rotating column 8 to rotate at high speed, so as to cut the weeds in the farmland. In order to avoid the cutting ropes 7 cutting the crops in the farmland, the guide plates 6 are arranged at the bottom of the protective cover 4, and the top end of the guide plate 6 is used to fold the weeds into the cutting range of the cutting ropes 7, so as to cut the weeds;

[0050] At the same time, in the cutting process, the high-speed rotation of the motor 3 drives the rotating column 8 inserted at the bottom center of the protective cover 4 through the bearing 20 through the hollow transmission shaft 21 inside, and the high-speed rotation of the rotating column 8 drives the high-speed rotation of the four sets of cutting ropes 7 installed around to realize the cutting of the weeds;

[0051] The bottom end of the cutting rope 7 is movably inserted into the rotating column 8 through the telescopic rod 11, and the high-speed rotation of the rotating column 8 drives the telescopic rod 11 to extend out of the rotating column 8 under the action of centrifugal force, thereby extending the cutting range of the cutting rope 7, and in this process, the cutting rope 7 has four states:

[0052] 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 arranged at the bottom end of the telescopic rod 11 is located in the sliding rail 13 on the surface of the rotating column 8 and adheres to the outer side wall, at this time, the telescopic rod 11 is inserted into the fixed disc 12 arranged on the inner side of the rotating column 8 and adheres to the inner side wall of the rotating column 8, and the positioning cone 17 arranged around the surface of the fixed disc 12 is inserted into the positioning hole 18 arranged on the inner side wall of the rotating column 8, and the centrifugal force of high-speed rotation is used to throw the telescopic rod 11 outward to the limit position and fix the extension length of the cutting rope 7 outward, and at the same time, the position of the cutting rope 7 can be fixed, so that the cutting rope 7 can keep fixed cutting and not rotate freely during the cutting process;

[0053] The second state is that 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 starts to enter the sliding rail 13. In this process, the sliding ball 15 will slide along the sliding rail 13 and change the depth of the sliding rail 13, thereby retracting the telescopic rod 11 into the rotating column 8, and the positioning cone 17 on the surface of the fixed disc 12 will be ejected out of the positioning hole 18 to lose the position limitation of the telescopic rod 11. Until the sliding ball 15 reaches the middle position of the sliding rail 13, the telescopic rod 11 is retracted into the rotating column 8 to the maximum extent, and the cutting rope 7 is retracted to the maximum extent. At this time, the cutting rope 7 is in the shortest cutting range, and the cutting rope 7 is retracted and inserted into the middle position of the cleaning sleeve 5, and the rotating gear 10 on the outside of the telescopic rod 11 is inserted into the rotating rack 16 on the inner side wall of the protective cover 4.

[0054] The third state is that the rotating column 8 continues to rotate, and the rotating gear 10 is engaged with the rotating rack 16 on the surface. The setting of the rotating rack 16 can drive the telescopic rod 11 and 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, the positioning cone 17 on the surface of the fixed disc 12 is separated from the positioning hole 18, and the sliding ball 15 is rotatably slid in the sliding rail 13, so that the telescopic rod 11 can be freely rotated.

[0055] The fourth state is that the rotating column 8 continues to rotate to separate the rotating gear 10 from the rotating rack 16, and the cutting rope 7 is rotated out of the cleaning sleeve 5. At this time, the sliding ball 15 slides in the sliding rail 13 from the middle position to the inwardly recessed end position and continuously slides to the initial position of the inwardly recessed sliding rail 13. The sliding ball 15 loses the limitation of the sliding rail 13 and is subjected to the centrifugal force, so as to eject the telescopic rod 11 out of the rotating column 8. The positioning cone 17 on the surface of the fixed disc 12 is inserted into the positioning hole 18 to fix the position of the telescopic rod 11, so as to completely extend the cutting rope 7 outward to cut the weeds.

[0056] It should be noted that the transmission shaft 21 is hollow and rotatably connected with the fixed shaft 9, so as to ensure that the transmission shaft 21 can rotate and the fixed shaft 9 will not rotate with the transmission shaft 21. At the same time, the transmission shaft 21 drives the rotating column 8 to rotate at high speed, and the fixed shaft 9 is rotatably connected in the rotating column 8 through the bearing 20, so as to fix the fixed shaft 9 while the rotating column 8 rotates, and the fixed shaft 9 will not rotate with the rotating column 8. In this way, the sliding ball 15 at the bottom end of the telescopic rod 11 can slide in the sliding rail 13 while rotating, and change the position of the telescopic rod 11 with the change of the depth of the sliding rail 13.

[0057] And when the cutting rope 7 rotates into the cleaning sleeve 5, the cutting rope 7 is brushed by the brush arranged in the cleaning sleeve 5, so that the dirt during cutting is prevented from winding on the cutting rope 7 and affecting the cutting use of the cutting rope 7.

[0058] Meanwhile, when the cutting rope 7 is retracted into the cleaning sleeve 5, the cutting rope 7 rotates into the cleaning sleeve 5 through the guide of the guide plate 6 due to the length of the cutting rope 7, and the tip part of the cutting rope 7 is brushed by the brush in the cleaning sleeve 5 to untangle the dirt on the surface of the cutting rope 7 in the rotating direction of the cutting rope 7.

[0059] Overall structure and working principle:

[0060] The application provides a hand-held grass cutter for farmland, as shown in the drawings, which comprises a hand-held frame 1, a motor 3, a rotating column 8, a cutting rope 7 and an adjusting mechanism. The hand-held frame 1 is provided with an auxiliary back strap 2 at one end (fixed end) and is provided with a protective cover 4 and the motor 3 at the other end (cutting end). 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, and the cutting rope 7 is telescopically installed on the outer side of the rotating column 8 through telescopic rods 11. The adjusting mechanism is linked with the rotating column 8 and passively realizes the retraction and cleaning of the cutting rope 7 and the rotation adjustment of the cutting surface during cutting.

[0061] Key component structure:

[0062] Transmission connection between the rotating column 8 and the motor 3:

[0063] The rotating column 8 is hollow and is provided with a fixed shaft 9 installed through a bearing 20. One end of the fixed shaft 9 penetrates 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, so as to ensure that the fixed shaft 9 is stationary. The motor 3 drives the rotating column 8 to rotate through a hollow transmission shaft 21, so as to realize the transmission relationship that “the transmission shaft 21 rotates to drive the rotating column 8 to rotate, and the fixed shaft 9 remains stationary”.

[0064] Specific structure of the adjusting mechanism:

[0065] Telescopic and rotating assembly: the cutting rope 7 is installed on the outer side of the rotating column 8 through the telescopic rods 11, the bottom end of the telescopic rod 11 extends to the inside through a through hole 14 in the side wall of the rotating column 8, the end of the telescopic rod 11 is fixed with a sliding ball 15, and the sliding ball 15 is in sliding cooperation with a sliding rail 13 on the surface of the fixed shaft 9. The inner wall of one side of the sliding rail 13 is linearly recessed, the recessed two ends correspond to the completely extended (working state) and completely retracted (cleaning state) of the cutting rope 7, and the deepest part of the recessed corresponds to the position of the rotating rack 16 in the protective cover 4.

[0066] Rotary adjustment assembly: the rotary gear 10 is fixed outside the exposed end of the telescopic rod 11, and the rotary rack 16 is fixed to the inner wall of the protective cover 4. The two can be disengaged and engaged. The rotary rack 16 is designed to drive the rotary gear 10 to rotate 90° each time, so as to rotate and switch the cutting surface of the cutting rope 7.

[0067] Positioning assembly: the fixed disc 12 is fixed to the inner side end of the telescopic rod 11, and the positioning cone 17 is arranged around the fixed disc 12. The positioning cone 17 is disengagably inserted into the positioning hole 18 in the inner wall of the rotating column 8, and is used to lock the extension state of the cutting rope 7.

[0068] Cleaning function assembly:

[0069] The cleaning sleeve 5 is arranged at the side close to the hand-held frame 1 of the bottom of the protective cover 4, and the cleaning brush is arranged in the cleaning sleeve 5. The cleaning sleeve 5 is matched with the protective cover 4 in size, the middle part of the cleaning sleeve 5 is outwardly protruded and larger than the maximum cutting range of the cutting rope 7, and the two ends of the cleaning sleeve 5 are provided with the guide plates 6. The guide plates 6 are connected to the bottom of the middle part of the cleaning sleeve 5, so as to guide the cutting rope 7 into the cleaning sleeve 5 and comb the sundries.

[0070] Working process and state switching:

[0071] Initial working state:

[0072] After the motor 3 is started, the hollow transmission shaft 21 drives the rotating column 8 to rotate at high speed, and the telescopic rod 11 is extended outward under the action of centrifugal force. At this time:

[0073] The sliding ball 15 is located at the outer side wall of the sliding rail 13, the positioning cone 17 of the fixed disc 12 is inserted into the positioning hole 18, the position of the telescopic rod 11 is locked, the cutting rope 7 is completely exposed outside the cleaning sleeve 5, and the cutting range is maximum.

[0074] The cutting rope 7 rotates at high speed to cut weeds, the protective cover 4 prevents splashing from hurting the operator, and the guide plates 6 guide the weeds into the cutting range.

[0075] Cleaning and adjustment state:

[0076] When the cutting rope 7 rotates with the rotating column 8 to the position of the cleaning sleeve 5:

[0077] Shrinking cleaning stage: the sliding ball 15 enters the recessed area of the sliding rail 13, and drives the telescopic rod 11 to shrink inwardly along with the depth change of the sliding rail 13. The positioning cone 17 is disengaged from the positioning hole 18, the cutting rope 7 is shortened and enters the cleaning sleeve 5, and the cleaning brush removes the sundries on the surface of the cutting rope 7.

[0078] Rotary adjustment stage: the rotary gear 10 at the exposed end of the telescopic rod 11 is engaged with the rotary rack 16 in the protective cover 4, the rotating column 8 continues to rotate to drive the rotary gear 10 to rotate 90°, and the cutting rope 7 is switched to cut the surface.

[0079] Reset working state:

[0080] The rotating column 8 continues to rotate, the rotating gear 10 separates from the rotating rack 16, the sliding ball 15 is separated from the recessed area of the sliding rail 13, the centrifugal force again throws the telescopic rod 11 outwards, the positioning cone 17 reinserts into the positioning hole 18, the cutting rope 7 is completely stretched out, and enters the cutting state of the next cycle.

[0081] Transmission and fixing mechanism:

[0082] The fixed shaft 9 is connected with the rotating column 8 through the bearing 20, which ensures that the fixed shaft 9 remains stationary when the rotating column 8 rotates at high speed, so that the sliding of the sliding ball 15 in the sliding rail 13 is only controlled by the centrifugal force and the shape of the sliding rail 13, and the passive extension and rotation of the telescopic rod 11 are realized.

[0083] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that the described embodiments can be modified in various ways without departing from the spirit and scope of the present application for those skilled in the art. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A hand-held field chopper comprising: Handheld frame (1) for handheld use of the mower, one end of the handheld frame (1) is fixed end and is provided with auxiliary shoulder strap (2), the other end of the handheld frame (1) is cutting end and is provided with protective cover (4) and motor (3), characterized in that, further comprising: Rotary column (8), transmission connection between the rotary column (8) and the motor (3) and rotatably installed in the center position of the bottom of the protective cover (4), the outer side of the rotary column (8) is peripherally mounted with cutting rope (7) in an extendable manner; Adjusting mechanism, transmission connection between the adjusting mechanism and the rotary column (8), in the process of high-speed rotation of the rotary column (8) driving the cutting rope (7) to cut, the adjusting mechanism passively shrinks the cutting rope (7) inward for cleaning, and passively rotates the cutting rope (7) by 90° to adjust the cutting surface of the cutting rope (7); The adjusting mechanism comprises a telescopic rod (11) arranged at the mounting end of the cutting rope (7), the bottom end of the telescopic rod (11) is movably inserted into the rotary column (8) around, the outer side of the outer end of the telescopic rod (11) inserted into the rotary column (8) is fixedly mounted with a rotating gear (10), one side of the rotating gear (10) is disconnectably meshed with a rotating rack (16), and the rotating rack (16) is fixedly mounted on the inner side wall of the protective cover (4); The rotating angle of the rotating gear (10) is 90° in each meshing period of the rotating rack (16) and the rotating gear (10); The adjusting mechanism further comprises a sliding ball (15) fixedly mounted on the end face of the telescopic rod (11) inserted into the rotary column (8), the sliding ball (15) is slidingly connected in a sliding rail (13), and the sliding rail (13) is arranged on the surface of a fixed shaft (9); The size of the sliding rail (13) is larger than the size of the sliding ball (15), and the outer side wall of one side of the sliding rail (13) is linearly recessed inward, and the positions of the recessed two ends correspond to the state that the cutting rope (7) is retracted in the cleaning sleeve (5), and the deepest part of the recess corresponds to the rotating rack (16) arranged in the protective cover (4).

2. A hand-held field chopper as claimed in claim 1, characterized in that The rotary column (8) is hollow, and the fixed shaft (9) is installed in the rotary column (8) through a bearing (20), the fixed shaft (9) penetrates the rotary shaft and is fixedly connected to the inside of the motor (3) through the bearing (20), one end of the rotary column (8) is connected to the motor (3) through a transmission shaft (21) fixedly connected, and the hollow transmission shaft (21) rotates to drive the rotary column (8) to rotate while keeping the fixed shaft (9) fixed.

3. A hand-held field chopper as claimed in claim 2, characterised in that The fixed disc (12) is fixedly mounted on the surface of the one end of the telescopic rod (11) inserted into the rotary column (8), the fixed disc (12) is fixedly provided with a positioning cone (17) around one side of the inner side wall of the rotary column (8), the positioning cone (17) is disconnectably inserted into a positioning hole (18), and the positioning hole (18) is correspondingly arranged around the through hole (14) arranged on the inner side wall of the rotary column (8).

4. The hand-held agricultural field chopper of claim 1 wherein, The cleaning sleeve (5) is arranged on the bottom of the protective cover (4) close to one side of the handheld frame (1), and the cleaning brush is arranged in the cleaning sleeve (5).

5. A hand-held field chopper as claimed in claim 4, characterized in that The cleaning sleeve (5) is matched with the size of the protective cover (4), and the outward protruding position of the middle part of the cleaning sleeve (5) is matched with the size of the cutting range of the cutting rope (7).

6. A hand-held field chopper as claimed in claim 5, characterised in that The cleaning sleeve (5) is provided with outwardly expanding material guide plates (6) at both ends, and the ends of the material guide plates (6) are communicated with the bottom of the outward protruding position of the middle section of the cleaning sleeve (5).

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