Portable low-noise agricultural weeding machine

Abstract

The utility model relates to the field of weeding machines, in particular to a portable low-noise agricultural weeding machine which comprises a box body, a driving device, a transmission assembly, a cutting wire, an elastic tensioning element and a tensioning wheel, and the driving device, the transmission assembly, the cutting wire, the elastic tensioning element and the tensioning wheel are installed on the box body. The driving device drives the deflector rod to periodically pull the cutting silk thread backwards through the transmission assembly, elastic potential energy accumulated by the elastic element is gradually increased while the cutting silk thread is pulled backwards, when the silk thread moves to be higher than the upper end of the deflector rod along the guide groove, the deflector rod skims over the lower portion of the cutting silk thread, and the cutting silk thread loses the poval acting force of the deflector rod; the elastic element releases elastic potential energy to drive the cutting wire to rapidly reset to a straightened state, in the reset process, the cutting wire cuts weeds in the reset path of the cutting wire, the whole process only has sound generated when the cutting wire collides with the weeds in the reset process, the cutting process is single-stroke, repeated cutting does not exist, and the cutting efficiency is improved. Therefore, compared with a rotary cutting blade type cutting machine and a scissor type cutting machine in the prior art, the noise is obviously reduced.

Description

Technical Field

[0001] This application relates to the field of weeding machines, and more particularly to a lightweight, low-noise agricultural weeding machine. Background Technology

[0002] Weeders are indispensable equipment in modern agricultural operations, widely used in various farmlands, wastelands, and garden maintenance. Their core function is to efficiently remove weeds growing on the ground to promote crop growth, keep the land clean, and prevent pests and diseases. Current agricultural weeding machine technology mainly revolves around using an electric motor or internal combustion engine as a power source, combined with a mobile device consisting of wheels or tracks, a sturdy support structure, and ingeniously designed cutting components.

[0003] Taking an electric motor-driven weed cutter as an example, its core working mechanism involves the motor outputting power, which, through a transmission system, drives the cutting blades to rotate at high speed to contact and cut weeds in its path. This type of weed cutter is widely praised for its powerful output and high operating speed, especially demonstrating significant advantages in large-area weeding tasks. However, along with this high efficiency comes a series of problems that urgently need to be solved:

[0004] ① Noise pollution: When the cutting disc rotates at high speed, it not only collides violently with weeds, but also creates strong aerodynamic interference with the surrounding air. The two work together to produce high-decibel noise. Long-term exposure to this environment can seriously threaten the hearing health of operators and may also cause noise pollution to the surrounding environment.

[0005] ② Environmental pollution and health risks: The high-speed rotating cutting blade instantly tears the weeds apart. This process not only generates a large amount of fine debris, but may also cause water vapor to evaporate due to frictional heat. The water mist carrying the distinctive odor of weeds permeates the air, posing a respiratory health risk to the operator. Therefore, wearing professional protective masks and goggles has become a necessary safety measure, but this undoubtedly increases the complexity and discomfort of the operation.

[0006] ③ Low energy efficiency and resource waste: Hand-push lawnmowers are limited by the speed and flexibility of manual operation, making it difficult to maintain continuous and efficient operation. Especially when turning, avoiding obstacles, or adjusting the working direction, the cutting blade is often in an ineffective working state, resulting in energy waste and low cutting efficiency. In addition, because the cutting blade rotates continuously at high speed, it will rotate unnecessarily even during periods when cutting is not required or in already cleared areas, leading to repeated cutting and additional noise.

[0007] ④ Limitations of scissor-type weed cutters: As an alternative technological approach, scissor-type weed cutters use a combination of fixed and reciprocating cutting teeth to remove weeds. While this design reduces some of the problems associated with rotary cutting to a certain extent, the reciprocating motion mechanism itself introduces new issues. Due to inertia and frequent collisions between the cutting teeth, the machine generates continuous and significant vibrations during operation, affecting operational stability, exacerbating noise pollution, and reducing operator comfort.

[0008] In summary, while existing agricultural weeding machines have demonstrated certain effectiveness in specific application scenarios, they still suffer from significant drawbacks such as poor noise control, environmental pollution, low energy efficiency, and insufficient operator comfort. There is an urgent need for technological innovation to optimize the cutting mechanism, reduce noise and pollution, improve operational efficiency, and ensure operator safety and health, in order to meet the pressing needs of modern agriculture for efficient, environmentally friendly, and user-friendly operating equipment. Utility Model Content

[0009] In view of this, a lightweight and low-noise agricultural weeding machine is proposed to reduce noise generated during operation, reduce environmental pollution, and improve energy efficiency.

[0010] This application provides a lightweight, low-noise agricultural weeder, including a housing and a drive device, transmission assembly, cutting wire, elastic tensioning element, and tensioning wheel mounted on the housing;

[0011] The cutting wire and the elastic tensioning element are connected end to end to form a ring. Multiple tensioning wheels are arranged in a rectangular shape inside the ring. The cutting wire is wound around the tensioning wheel. The tensioning wheel is rotatably connected to the housing.

[0012] The transmission assembly includes two sets of sprocket mechanisms. Each sprocket mechanism includes a driving sprocket, a driven sprocket, and a transmission chain. The driving sprocket and the driven sprocket are arranged side by side on the inner side of the transmission chain and are respectively meshed with the transmission chain for transmission. The driving sprocket and the driven sprocket are arranged in a rectangular shape.

[0013] The transmission assembly further includes two worm gears, two worms, a transmission shaft, a driven gear, and a driving gear. The two worm gears are coaxially and fixedly connected to the two driving sprockets, and the two worms are coaxially and fixedly connected to the transmission shaft. The worm gears and worms are meshed and transmitted. The driving gear is fixedly connected to the output shaft of the drive device, and the driven gear is coaxially and fixedly connected to the transmission shaft and meshes and transmits with the driving gear.

[0014] The drive sprocket and the worm gear are coaxially arranged and rotatably connected to the housing respectively. The drive shaft is rotatably connected to the housing. The drive sprocket is located between the worm gear and the driven sprocket. The drive sprocket and the driven sprocket are arranged in the front-to-back direction. The two driven sprockets are arranged in the left-to-right direction. The elastic tensioning element is located behind the line connecting the centers of the two drive sprockets.

[0015] A lever is fixedly connected to the transmission chain. The lever is arranged in the vertical direction, and the cutting wire is located between the planes of the upper and lower ends of the lever.

[0016] The housing is provided with two guide grooves arranged in the left-right direction. The guide grooves are inclined relative to the plane where the cutting wire is located. The rear side of the guide groove is higher than the front side of the guide groove. The cutting wire passes through the guide groove. The front side of the guide groove is lower than the cutting wire. The rear side of the guide groove is higher than the upper end of the lever. The transmission chain on the left is located to the left of the left guide groove, and the transmission chain on the right is located to the right of the right guide groove.

[0017] From a top-down perspective, the worm gear on the left rotates clockwise, the worm gear on the right rotates counterclockwise, and the diameter of the driven sprocket is larger than the diameter of the tensioning wheel.

[0018] In some embodiments of the above-mentioned lightweight and low-noise agricultural weeder, the front side of the housing has a U-shaped grass collection port, and the internal space of the housing includes a rear space, a left space, and a right space. The rear space is located behind the grass collection port, the left space is located to the left of the grass collection port, and the right space is located to the right of the grass collection port.

[0019] The guide grooves are respectively arranged through the left and right walls of the grass collection port. One of the driving worm gears and one set of sprocket mechanisms are located in the left space, and the other set of sprocket mechanisms is located in the right space. The cutting wire passes through the two guide grooves in the left-right direction.

[0020] In some embodiments of the above-mentioned lightweight and low-noise agricultural weeder, multiple central rotating shafts are fixedly connected inside the housing, and the driving sprocket, the driven sprocket, the worm gear, and the tensioning wheel are rotatably connected to the central rotating shafts respectively.

[0021] In some embodiments of the aforementioned lightweight and low-noise agricultural weeder, the transmission chain has two levers, and the distance between the two levers along the transmission chain is equal to half the length of the transmission chain; on the plane where the central axes of the two drive sprockets are located, the height of the guide groove is equal to or greater than the height of the upper end of the lever.

[0022] In some embodiments of the aforementioned lightweight and low-noise agricultural weeder, a fixing block is fixedly connected inside the housing. The fixing block is located in the middle between the two drive sprockets. There are two elastic tensioning elements, which are respectively located on the left and right sides of the fixing block. The two ends of one elastic tensioning element are fixedly connected to the left side of the fixing block and the cutting wire, respectively. The two ends of the other elastic tensioning element are fixedly connected to the right side of the fixing block and the cutting wire, respectively.

[0023] In some embodiments of the aforementioned lightweight and low-noise agricultural weeding machine, the elastic tensioning element is a tension spring or an elastic rope.

[0024] In some embodiments of the above-mentioned lightweight and low-noise agricultural weeding machine, the two worm gears rotate in opposite directions, a bearing seat is fixedly connected inside the housing, and the drive shaft is rotatably connected to the bearing seat.

[0025] In some embodiments of the above-mentioned lightweight and low-noise agricultural weeder, the drive shaft and the drive device are located in the rear space, the drive device is a motor, and multiple batteries are fixedly connected in the rear space and connected to the drive device.

[0026] In some embodiments of the aforementioned lightweight and low-noise agricultural weeder, the housing includes a side panel, a top cover, and a bottom plate. The rear space, the left side space, and the right side space are formed by the side panel. The top cover is fixedly attached to the upper end of the side panel, and the bottom plate is fixedly attached to the lower end of the side panel. The guide groove is provided on the side panel. The front of the side panel slopes backward from the center to the left and right sides. The edges of the top cover and the bottom plate are vertically aligned with the edges of the upper and lower ends of the side panel. The top cover and the bottom plate are U-shaped. The grass collection port is formed by the side panel.

[0027] In some embodiments of the aforementioned lightweight and low-noise agricultural weeding machine, the lightweight and low-noise agricultural weeding machine further includes rollers and a push-pull rod. A U-shaped support is fixedly connected to the rear side of the housing. The support has an opening facing rearward. A rotating shaft arranged in the left-right direction is rotatably connected to the inner side of the support. The roller is located inside the support and is fixedly connected to the rotating shaft. The bottom surface of the roller is lower than the bottom surface of the housing. One end of the push-pull rod is fixedly connected to the rear side of the housing, and the other end of the push-pull rod extends from bottom to top and from front to back to the upper rear of the housing.

[0028] The beneficial effects of this utility model are:

[0029] The drive unit drives a lever to periodically pull the cutting wire backward via a transmission component. As the wire is pulled backward, the elastic potential energy accumulated in the elastic element gradually increases. When the wire moves along the guide groove to a position above the upper end of the lever, the lever sweeps past the wire from below, and the wire loses the pulling force of the lever. The elastic element releases its elastic potential energy, causing the wire to quickly return to a taut state. During the return process, the wire cuts weeds in its return path. The only sound during this process is the collision between the wire and weeds, and the cutting process is a single stroke without repeated cutting. Therefore, the noise is significantly reduced compared to existing rotary cutting blade and scissor-type cutting machines. The backward pulling and energy storage process is relatively slow, providing time for the operator to move. When the operator moves to the next cutting area, the wire is released again, and this cycle repeats, reducing noise, environmental pollution, and energy efficiency. Since the wire cutting action uses a power storage method, the output power requirement of the drive device is relatively low. A high-speed, low-torque motor can be used as the drive device, and a transmission component with speed reduction and torque amplification can be used to achieve slow and powerful pulling of the cutting wire. This further reduces working noise and helps to reduce the size of the entire box, making it easier to carry and more portable.

[0030] The transmission components use a small-diameter driving gear, a large-diameter driven gear, a worm gear, and a worm to achieve speed reduction and torque increase. The motor is a high-speed, low-torque electric motor. Multiple batteries are installed in the rear space to improve the range. It is lightweight, low-noise, and highly energy efficient. The entire box is only connected to the outside through the guide groove. The cutting wire uses fine steel wire with a diameter of 0.3 to 0.5 mm. Therefore, the guide groove has a slit structure. The entire box is equivalent to a fully enclosed structure, which makes it difficult for weeds, insects, and other debris to enter, and it is easy to clean and maintain. Attached Figure Description

[0031] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0032] Figure 1 This is a schematic diagram of the front three-dimensional structure of the lightweight, low-noise agricultural weeder in the embodiments of this application;

[0033] Figure 2 This is a three-dimensional structural diagram of the rear side of the lightweight, low-noise agricultural weeder in the embodiments of this application;

[0034] Figure 3 This is a schematic diagram of the internal structure of the box in an embodiment of this application;

[0035] Figure 4This is a schematic diagram of the connection structure of the various components inside the housing in the embodiments of this application;

[0036] Figure 5 This is a schematic diagram of the structure when the cutting wire is pulled to the final position in an embodiment of this application;

[0037] Figure 6 This is a top view of the box in an embodiment of this application;

[0038] Figure 7 It is along Figure 6 A cross-sectional view along line AA in the middle.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100. Housing; 102. Drive unit; 104. Transmission assembly; 106. Cutting wire; 108. Elastic tensioning element; 110. Tensioning wheel; 112. Drive sprocket; 114. Driven sprocket; 116. Transmission chain; 118. Worm gear; 120. Worm; 122. Transmission shaft; 124. Driven gear; 126. Drive gear; 128. Output shaft; 130. Lever; 132. Guide groove; 134. Grass collection port; 136. Rear space; 138. Left side space; 140. Right side space; 142. Central rotating shaft; 144. Fixing block; 146. Bearing seat; 148. Battery; 150. Enclosure; 152. Top cover; 154. Bottom plate; 156. Roller; 158. Push-pull rod; 160. Support; 162. Rotating shaft. Detailed Implementation

[0041] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise. The term "exemplary" as used herein means "serving as an example, embodiment, or illustration." Any embodiment illustrated herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. Furthermore, for the purpose of better illustrating this application, those skilled in the art will understand that numerous specific details are set forth in the various embodiments described below. This application can be practiced without certain specific details. In some embodiments, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the spirit of this application.

[0042] Combination Figures 1 to 7 As shown ( Figure 6(The dotted lines in the text are the obscured outlines). This application provides a lightweight, low-noise agricultural weeder, including a housing 100 and a drive unit 102, a transmission assembly 104, a cutting wire 106, an elastic tensioning element 108, and a tensioning wheel 110 mounted on the housing 100. The cutting wire 106 and the elastic tensioning element 108 are connected end to end to form a ring. Multiple tensioning wheels 110 are arranged in a rectangular shape inside the ring. The cutting wire 106 is wound around the tensioning wheel 110, and the tensioning wheel 110 is rotatably connected to the housing 100. The transmission assembly 104 includes two sets of sprocket mechanisms, each including a driving sprocket 112, a driven sprocket 114, and a transmission chain 116. The driving sprocket 112 and driven sprocket 114 are arranged side by side inside the transmission chain 116 and are respectively meshed with the transmission chain 116 for transmission. The driving sprocket 112 and driven sprocket 114 are arranged in a rectangular shape. The transmission assembly 104 also includes two worm gears 118, two worms 120, a transmission shaft 122, a driven gear 124, and a driving gear 126. The two worm gears 118 are coaxially fixedly connected to the two driving sprockets 112, and the two worms 120 are coaxially fixedly connected to the transmission shaft 122. The worm gears 118 and worms 120 are meshed for transmission. The driving gear 126 is fixedly connected to the output shaft 128 of the drive device 102, and the driven gear 124 is coaxially connected to the transmission shaft 122. The shaft is fixedly connected and meshes with the drive gear 126 for transmission; the drive sprocket 112 and the worm gear 118 are coaxially arranged and rotatably connected to the housing 100 respectively; the drive shaft 122 is rotatably connected to the housing 100; the drive sprocket 112 is located between the worm gear 118 and the driven sprocket 114; the drive sprocket 112 and the driven sprocket 114 are arranged in the front-to-back direction, and the two driven sprockets 114 are arranged in the left-to-right direction; the elastic tensioning element 108 is located behind the line connecting the centers of the two drive sprockets 112; a lever 130 is fixedly connected to the transmission chain 116; the lever 130 is arranged in the up-down direction; the cutting wire 106 is located between the planes of the upper and lower ends of the lever 130; the housing 100 The lever 130 has two guide grooves 132 arranged in the left-right direction. The guide grooves 132 are inclined relative to the plane where the cutting wire 106 is located. The rear side of the guide groove 132 is higher than the front side of the guide groove 132. The cutting wire 106 passes through the guide groove 132. The front side of the guide groove 132 is lower than the cutting wire 106. The rear side of the guide groove 132 is higher than the upper end of the lever 130. The left drive chain 116 is located to the left of the left guide groove 132, and the right drive chain 116 is located to the right of the right guide groove 132. In a top view, the left worm gear 118 rotates clockwise, and the right worm gear 118 rotates counterclockwise. The diameter of the driven sprocket 114 is larger than the diameter of the tensioner 110.

[0043] During operation, the drive unit 102 drives the lever 130 to periodically pull the cutting wire 106 backward through the transmission component 104. As the cutting wire 106 is pulled backward, the elastic potential energy accumulated by the elastic element gradually increases. When the cutting wire moves along the guide groove 132 to a position higher than the upper end of the lever 130, the lever 130 passes under the cutting wire 106, and the cutting wire 106 loses the pulling force of the lever 130. The elastic element releases its elastic potential energy, causing the cutting wire 106 to quickly return to a straight state. During the return process, the cutting wire 106 cuts the weeds in its return path. The only sound in the whole process is the collision sound between the cutting wire and the weeds during the return process. Moreover, the cutting process is a single stroke and there is no repeated cutting. Therefore, the noise is significantly reduced compared to the rotary cutting blade type and scissor type cutting machines in the prior art. The pull-back power-accumulation process is relatively slow, providing time for the worker to move. When the worker moves to the next cutting area, the cutting wire 106 is released again, and this cycle repeats, reducing noise generated during operation, minimizing environmental pollution, and improving energy efficiency. Because the cutting action of the cutting wire 106 uses a power-accumulation method, the output power requirement of the drive device 102 is relatively low. A high-speed, low-torque motor can be used as the drive device 102, paired with a speed-reducing and torque-increasing transmission component 104, which can achieve slow but powerful pulling of the cutting wire 106. This further reduces working noise and helps to reduce the size of the entire housing 100, making it easier to carry and more portable.

[0044] The specific settings include the following exemplary implementation methods:

[0045] In some exemplary embodiments of this example, the front side of the box 100 has a U-shaped grass collection port 134. The internal space of the box 100 includes a rear space 136, a left space 138, and a right space 140. The rear space 136 is located behind the grass collection port 134, the left space 138 is located to the left of the grass collection port 134, and the right space 140 is located to the right of the grass collection port 134. Guide grooves 132 are respectively provided through the left and right walls of the grass collection port 134. One drive worm gear 118 and one set of sprocket mechanisms are located in the left space 138, and the other set of sprocket mechanisms are located in the right space 140. The cutting wire 106 passes through the two guide grooves 132 in the left-right direction.

[0046] In some exemplary embodiments of this example, a plurality of central rotating shafts 142 are fixedly connected inside the housing 100, and the driving sprocket 112, the driven sprocket 114, the worm gear 118, and the tensioning wheel 110 are respectively rotatably connected to the central rotating shafts 142.

[0047] In some exemplary embodiments of the present embodiment, there are two lever rods 130 on the drive chain 116, and the distance between the two lever rods 130 along the drive chain 116 is equal to half of the length of the drive chain 116; at the position of the plane where the central axes of the two driving sprockets 112 are located, the height of the guiding groove 132 is equal to or greater than the height of the upper end of the lever rod 130.

[0048] In some exemplary embodiments of the present embodiment, a fixed block 144 is fixedly connected inside the box body 100. The fixed block 144 is located at the middle position between the two driving sprockets 112. There are two elastic tension elements 108, which are respectively located on the left and right sides of the fixed block 144. Two ends of one elastic tension element 108 are fixedly connected to the left side of the fixed block 144 and the cutting wire 106 respectively, and two ends of the other elastic tension element 108 are fixedly connected to the right side of the fixed block 144 and the cutting wire 106 respectively.

[0049] In some exemplary embodiments of the present embodiment, the elastic tension element 108 is a tension spring or an elastic cord.

[0050] In some exemplary embodiments of the present embodiment, the rotation directions of the two worm wheels 118 are opposite. A bearing seat 146 is fixedly connected inside the box body 100, and the transmission shaft 122 is rotatably connected to the bearing seat 146.

[0051] In some exemplary embodiments of the present embodiment, the transmission shaft 122 and the driving device 102 are located in the rear space 136. The driving device 102 is a motor. A plurality of batteries 148 are fixedly connected in the rear space 136 and are connected to the driving device 102.

[0052] In some exemplary embodiments of the present embodiment, the box body 100 includes a surrounding plate 150, a top cover 152, and a bottom plate 154. The rear space 136, the left space 138, and the right space 140 are surrounded by the surrounding plate 150. The top cover 152 is fixedly connected to the upper end of the surrounding plate 150, and the bottom plate 154 is fixedly connected to the lower end of the surrounding plate 150. The guiding groove 132 is provided on the surrounding plate 150. The front surface of the surrounding plate 150 slopes backward from the center to both left and right sides. The edges of the top cover 152 and the bottom plate 154 are respectively aligned with the upper and lower edges of the surrounding plate 150 in the vertical direction. The shapes of the top cover 152 and the bottom plate 154 are in a shape of "匚", and the grass collecting port 134 is surrounded by the surrounding plate 150.

[0053] In some exemplary embodiments of this example, the lightweight and low-noise agricultural weeder also includes a roller 156 and a push-pull rod 158. A U-shaped support 160 is fixedly connected to the rear side of the housing 100. The support 160 has its opening facing rearward. A rotating shaft 162 arranged in the left-right direction is rotatably connected to the inner side of the support 160. The roller 156 is located inside the support 160 and is fixedly connected to the rotating shaft 162. The bottom surface of the roller 156 is lower than the bottom surface of the housing 100. One end of the push-pull rod 158 is fixedly connected to the rear side of the housing 100, and the other end of the push-pull rod 158 extends from bottom to top and from front to back to the upper rear of the housing 100.

[0054] Based on the above exemplary embodiments, the transmission assembly 104 uses a small-diameter driving gear 126, a large-diameter driven gear 124, a worm gear 118, and a worm 120 to achieve speed reduction and torque increase. The motor is a high-speed, low-torque electric motor. Multiple batteries 148 are configured in the rear space 136 to improve the range performance. It has the effects of being lightweight, low-noise, and high-energy-efficiency. The entire housing 100 is only connected to the outside through the guide groove 132. The cutting wire 106 uses fine steel wire with a diameter of 0.3 to 0.5 mm. Therefore, the guide groove 132 is a slit structure. The entire housing 100 is equivalent to a fully enclosed structure, which makes it difficult for weeds, insects, and other debris to enter, and facilitates cleaning and maintenance.

[0055] In this embodiment, "up," "down," "left," "right," "front," and "back" refer to the view directions in the accompanying drawings, such as... Figure 1 The corresponding arrows are indicated in the annotations.

[0056] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A portable, low-noise agricultural weeder, characterized by comprising: The utility model relates to a cutting device, including box (100) and install drive arrangement (102) on box (100), transmission assembly (104), cutting wire (106), elastic tensioning element (108), tensioning wheel (110), Cutting wire (106) and elastic tensioning element (108) are connected into ring shape at the head and tail, tensioning wheel (110) has multiple and is arranged in rectangle inside the ring shape, cutting wire (106) is wound on tensioning wheel (110), tensioning wheel (110) is rotatably connected with box (100), Transmission assembly (104) includes two sets of chain wheel mechanism, chain wheel mechanism includes driving sprocket (112), driven sprocket (114), transmission chain (116), driving sprocket (112) and driven sprocket (114) are arranged side by side in transmission chain (116) inside and are respectively meshed with transmission chain (116) and are connected, driving sprocket (112), driven sprocket (114) are arranged in rectangle, Transmission assembly (104) further includes two worm gears (118), two worms (120), transmission shaft (122), driven gear (124), driving gear (126), two worm gears (118) are respectively coaxially fixedly connected with two driving sprockets (112), two worms (120) are respectively coaxially fixedly connected with transmission shaft (122), worm gear (118) and worm (120) are meshed and are connected, driving gear (126) is fixedly connected with the output shaft (128) of drive arrangement (102), driven gear (124) is coaxially fixedly connected with transmission shaft (122) and is meshed and is connected with driving gear (126), Driving sprocket (112) is coaxially arranged with worm gear (118) and is rotatably connected with box (100) respectively, transmission shaft (122) is rotatably connected with box (100), driving sprocket (112) is located between worm gear (118) and driven sprocket (114), driving sprocket (112) and driven sprocket (114) are arranged along front-back direction, two driven sprockets (114) are arranged along left-right direction, elastic tensioning element (108) is located at the rear side of the center connecting line of two driving sprockets (112), Transmission chain (116) is fixedly connected with the lever (130) on it, the lever (130) is arranged along up-down direction, cutting wire (106) is located between the plane of the upper and lower ends of lever (130). The box (100) is provided with two guide grooves (132) arranged along the left-right direction, the guide grooves (132) are inclined relative to the plane where the cutting wire (106) is located, the rear side of the guide groove (132) is higher than the front side of the guide groove (132), the cutting wire (106) passes through the guide groove (132), the front side of the guide groove (132) is lower than the cutting wire (106), the rear side of the guide groove (132) is higher than the upper end of the shift rod (130), the left transmission chain (116) is located on the left side of the left guide groove (132), and the right transmission chain (116) is located on the right side of the right guide groove (132). In the view from the top, the left worm gear (118) rotates clockwise, the right worm gear (118) rotates counterclockwise, and the diameter of the driven sprocket (114) is greater than the diameter of the tensioning wheel (110).

2. The portable low-noise agricultural weeder according to claim 1, wherein The front side of the box (100) has a H-shaped grass collecting port (134), the internal space of the box (100) includes a rear space (136), a left side space (138) and a right side space (140), the rear space (136) is located at the rear side of the grass collecting port (134), the left side space (138) is located at the left side of the grass collecting port (134), and the right side space (140) is located at the right side of the grass collecting port (134). The guide grooves (132) are respectively arranged through the left side wall and the right side wall of the grass collecting port (134), one of the worm gears (118) and one group of the sprocket mechanisms are located in the left side space (138), and the other group of the sprocket mechanisms are located in the right side space (140), and the cutting wire (106) passes through the two guide grooves (132) along the left-right direction.

3. The portable low-noise agricultural weeder according to claim 1, wherein A plurality of central rotating shafts (142) are fixedly connected inside the box (100), and the driving sprocket (112), the driven sprocket (114), the worm gear (118) and the tensioning wheel (110) are rotationally connected with the central rotating shafts (142).

4. The portable low-noise agricultural weeder according to claim 1, wherein The transmission chain (116) is provided with two shift rods (130), the distance between the two shift rods (130) along the transmission chain (116) is equal to half the length of the transmission chain (116), and the height of the guide groove (132) is equal to or higher than the height of the upper end of the shift rod (130) at the position of the central axis of the two driving sprockets (112).

5. The portable low-noise agricultural weeder according to claim 1, wherein The box (100) is internally fixedly connected with a fixed block (144), the fixed block (144) is located at the middle position between the two driving sprockets (112), the elastic tensioning element (108) has two and is respectively located at the left and right sides of the fixed block (144), one end of one of the elastic tensioning elements (108) is fixedly connected with the left side of the fixed block (144) and the cutting wire (106), and the other end of the other elastic tensioning element (108) is fixedly connected with the right side of the fixed block (144) and the cutting wire (106).

6. The portable low-noise agricultural weeder according to claim 5, wherein The elastic tensioning element (108) is a tension spring or an elastic rope.

7. The portable low-noise agricultural weeder according to claim 1, wherein The two worm gears (118) are opposite in rotation direction, the box (100) is internally fixedly connected with a bearing seat (146), and the transmission shaft (122) is rotationally connected with the bearing seat (146).

8. The portable low-noise agricultural weeder according to claim 2, wherein The transmission shaft (122) and the driving device (102) are located in the rear space (136), the driving device (102) is an electric motor, a plurality of batteries (148) are fixedly connected in the rear space (136) and are connected with the driving device (102).

9. The portable low-noise type agricultural weeder according to claim 2, wherein The box (100) comprises a surrounding plate (150), a top cover (152) and a bottom plate (154), the rear space (136), the left side space (138) and the right side space (140) are surrounded by the surrounding plate (150), the top cover (152) is fixedly connected to the upper end of the surrounding plate (150), the bottom plate (154) is fixedly connected to the lower end of the surrounding plate (150), the guide groove (132) is arranged on the surrounding plate (150), the front of the surrounding plate (150) is inclined rearward from the center to the left and right sides, the edges of the top cover (152) and the bottom plate (154) are respectively aligned with the edges of the upper and lower ends of the surrounding plate (150) in the vertical direction, the top cover (152) and the bottom plate (154) are in the shape of a Chinese character 'fang', and the grass collecting opening (134) is surrounded by the surrounding plate (150).

10. The portable, low-noise agricultural weeder according to claim 9, characterized by The portable low-noise agricultural weeder further comprises a roller (156) and a push-pull rod (158), the rear side of the box (100) is fixedly connected with a Chinese character 'fang' shaped support (160), the support (160) is provided with an opening facing rearward, a rotating shaft (162) arranged in the left-right direction is rotationally connected to the inner side of the support (160), the roller (156) is located on the inner side of the support (160) and is fixedly connected with the rotating shaft (162), and the bottom surface of the roller (156) is lower than the bottom surface of the box (100); one end of the push-pull rod (158) is fixedly connected with the rear side of the box (100), and the other end of the push-pull rod (158) extends from bottom to top and from front to rear to the upper rear of the box (100).

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