An adjustable grass cutting disc

Abstract

The application relates to the technical field of lawn mowers, in particular to an adjustable mower cutterhead, which comprises a cutterhead assembly, an adjusting assembly and an adjusting power assembly; the adjusting assembly comprises four adjusting arms, two parallel rods and four sliding parts; the adjusting arms are rotationally arranged on a mounting frame; the two ends of the parallel rods are rotationally connected with the adjusting arms; the adjusting arms are provided with mounting grooves and avoiding straight grooves; the upper ends of the sliding parts are inserted into the mounting grooves and can slide along the avoiding straight grooves; the cutterhead assembly comprises a cutterhead cover which is arranged at the lower end of the sliding part; the adjusting power assembly comprises a handle part, a mounting part and a locking part; the mounting part is arranged on the mounting frame; the lower end of the handle part is arranged on one of the adjusting arms and is locked on the mounting part through the locking part. When obstacles are encountered, the cutterhead assembly can be integrally moved backward, so that mechanical damage is reduced.

Description

Technical Field

[0001] This application relates to the field of lawnmower technology, and in particular to an adjustable lawnmower blade. Background Technology

[0002] Lawn mowers are indispensable and efficient tools in modern garden maintenance. They rely on high-speed rotating blades to trim lawns to an even height, leaving outdoor spaces neat and beautiful. They come in various types, including push mowers, ride-on mowers, and robotic mowers, suitable for both small family yards and large lawns in parks and sports fields. Compared to traditional sickles, they are not only more labor-saving and efficient, but also allow for adjustment of the blade height to meet the mowing needs of different grass species and seasons.

[0003] Currently, a Chinese utility model patent application with publication number CN222764318U and publication date of April 18, 2025, proposes a cutter head lifting mechanism, which includes the following structure: a connecting shaft, a connecting crossbeam, a telescopic push rod, a front lifting arm, and a rear lifting arm. The connecting shaft is fixedly connected to the mounting frame of the vehicle body. The front end of the connecting crossbeam is rotatably connected to the upper end of the front lifting arm, and the rear end is rotatably connected to the upper end of the rear lifting arm. The lower ends of the front lifting arm and the rear lifting arm are rotatably connected to the cutter head. The fixed end of the telescopic push rod is fixedly connected to the mounting frame, and the telescopic end of the telescopic push rod is fixedly connected to one of the several rear lifting arms.

[0004] During cutter head adjustment, the free end of the telescopic push rod is moved, which drives a rear lifting arm to swing. The rear lifting arm drives the parallelogram formed by the connecting beam, the front lifting arm, and the rear lifting arm to swing, causing the front and rear lifting arms to swing the cutter head upward, thus achieving cutter head lifting and adjustment.

[0005] Regarding the aforementioned technologies, when the equipment encounters an obstacle, if the front wheels have successfully overturned the obstacle and the vehicle body is level, but the low-position cutter head is still in contact with the obstacle and cannot be overcome, if the operator does not notice the abnormality in time or fails to react in time, the continuous working power can easily cause the cutter head to be impacted and deformed, and may even cause cracks or displacement in precision components such as the lifting mechanism's connecting rods and shafts, resulting in irreversible mechanical damage. Summary of the Invention

[0006] This application provides an adjustable mowing blade that can move backward as a whole when encountering an obstacle, reducing mechanical damage.

[0007] An adjustable lawnmower blade includes: Cutter head assembly, adjustment assembly, and adjustment power assembly; The adjustment assembly includes four adjustment arms, two parallel rods, and four sliding parts. The adjustment arms are rotatably mounted on the mounting frame. The two ends of the parallel rods are rotatably connected to the adjustment arms. The adjustment arms are provided with mounting grooves and clearance grooves. The upper end of the sliding part is inserted into the mounting groove and can slide along the clearance groove. The cutter head assembly includes a cutter head cover, which is disposed at the lower end of the sliding portion; The adjustment power assembly includes a handle, a mounting part, and a locking part. The mounting part is disposed on the mounting frame, and the lower end of the handle is disposed on an adjustment arm. The locking part locks the handle onto the mounting part.

[0008] By adopting the above technical solution, when adjusting the height of the cutter head assembly, the locking part is unlocked, the operating handle is activated, and the handle drives an adjusting arm to swing. One adjusting arm drives a parallel rod to swing, and one parallel rod drives another adjusting arm to swing. The two adjusting arms on one side drive the sliding part in the mounting groove to move downward. Under the gravity of the cutter head assembly, the sliding part on the other side moves downward, thereby realizing the swing of the adjusting arm and parallel rod on the other side, and realizing the downward movement of the cutter head assembly. When the front wheels successfully overturn the obstacle and the vehicle body tends to be level, when the cutter head assembly contacts the obstacle, under the resistance of the obstacle, the sliding part disengages from the mounting groove, enters the clearance groove, and moves along it, giving the operator a certain reaction time and reducing the possibility of mechanical damage to the cutter head assembly and adjusting assembly.

[0009] Optionally, the mounting groove is a minor arc groove.

[0010] By adopting the above technical solution, and utilizing the structural characteristics of the larger opening and smaller curvature of the inferior arc groove, the sliding part can slide out and detach more smoothly and unimpeded from the groove opening of the installation groove when an accidental collision occurs. This effectively avoids the jamming phenomenon caused by the excessive curvature of the groove, thereby ensuring that the sliding part can quickly and accurately enter the avoidance groove, achieving reliable displacement avoidance, and thus improving the response sensitivity and overall safety of the structure under impact conditions.

[0011] Optionally, it also includes several reset components, each including a guide cylinder, a tension spring, and a guide rod. One end of the guide cylinder is rotatably mounted on the mounting bracket. One end of the tension spring and one end of the guide rod are disposed inside the guide cylinder. One end of the tension spring is connected to the guide cylinder, and the other end is connected to the guide rod. The guide rod is rotatably mounted on the cutter head cover.

[0012] By employing the above technical solution, the tension spring pulls the cutter head cover forward, keeping the sliding part within the mounting groove. The tension spring remains under tension at all times. When adjusting the height of the cutter head assembly, the cutter head cover drives the guide rod to swing and move along the guide cylinder, which in turn drives the tension spring. When encountering an obstacle, the cutter head cover moves backward, further stretching the tension spring. After the cutter head cover disengages from the obstacle, the tension spring returns to its original position, moving the cutter head cover forward. This causes the sliding part to move along the clearance groove into the mounting groove, resetting the cutter head cover to its original position. During normal mowing, the tension spring maintains the position of the cutter head assembly for easy mowing. When the cutter head cover disengages from an obstacle, the cutter head assembly quickly resets, ensuring normal subsequent operation.

[0013] Optionally, it also includes an alarm component, which includes at least one proximity switch and an alarm. The proximity switch is mounted on the mounting bracket, facing the center of the clearance groove, and the alarm is mounted on the mounting bracket. The proximity switch and the alarm are electrically connected.

[0014] By adopting the above technical solution, when the sliding part moves along the avoidance groove and finally faces the proximity switch, the proximity switch is triggered and generates a sensing signal, which then controls the alarm to issue a warning, thus timely reminding the operator to intervene and significantly improving the safety protection level of the equipment.

[0015] Optionally, the cutter head assembly further includes a plurality of cutters, a mowing drive wheel of the same number as the cutters, a drive belt, a transition wheel, an adjusting wheel, an adjusting frame, and an adjusting spring. The mowing drive wheel is rotatably mounted on the cutter head cover and can rotate around its axis. The cutters are mounted on the mowing drive wheel. The transition wheel is rotatably mounted on the cutter head cover and can rotate around its axis. One end of the adjusting frame is rotatably mounted on the cutter head cover. The adjusting wheel is rotatably mounted in the middle of the adjusting frame and can rotate around its axis. One end of the adjusting spring is mounted on the other end of the adjusting frame, and the other end is mounted on the cutter head cover. The drive belt surrounds the mowing drive wheel, the transition wheel, the adjusting wheel, and the output end of the power assembly. The power assembly is mounted on the mounting frame.

[0016] By adopting the above technical solution, during mowing, the powertrain is controlled to drive the transmission belt, which in turn drives the mowing wheel, transition wheel, and adjusting wheel to rotate. The mowing wheel then drives the dry cutter blade to rotate, and the blade rotates to cut the grass. When adjusting the position of the cutter head assembly, the overall movement of the cutter head assembly is decomposed into movement along the height direction and the front-to-back direction. By setting an adjusting spring, the adjusting frame is made to swing in the horizontal plane, keeping the transmission belt taut. The entire powertrain is positioned near the edge of the cutter head cover to reduce the tilting of the transmission belt caused by the adjustment of the cutter head assembly. The lateral deviation force is counteracted by using the adjusting spring, transition wheel, adjusting wheel, and powertrain position.

[0017] Optionally, the cutter head cover includes a top plate, a cutter cover, and a grass guide cover. The upper side of the top plate is disposed at the lower end of the sliding part. The guide rod, the cutting power wheel, the transition wheel, the adjusting wheel, and the adjusting frame are rotatably disposed on the top plate. The end of the adjusting spring away from the adjusting frame is disposed on the top plate. The cutter cover and the grass guide cover are disposed on the lower side of the top plate. Adjacent cutter covers are connected in sequence. The cutter cover is provided with a first channel, and the grass guide cover is provided with a second channel. The cutter cover, the first channel, the second channel, and the grass guide cover form a grass guiding channel.

[0018] By adopting the above technical solution, when the mowing power wheel rotates at high speed to perform mowing operations, the cut grass stems are first smoothly guided into the first channel along the inner wall of the blade cover under the centrifugal force and airflow generated by the rotation of the mowing power wheel, and then discharged from the grass guide cover through the second channel, thereby achieving efficient grass collection and orderly grass discharge, and effectively avoiding grass blockage.

[0019] Optionally, the cutter head cover further includes a first baffle and a second baffle, the first baffle being inserted into the first channel and disposed on the lower side of the top plate, and the second baffle being inserted into the second channel and disposed on the lower side of the top plate.

[0020] By adopting the above technical solution, the grass guiding channel is closed by using the first baffle and the second baffle, realizing the conversion from grass cutting mode to grass shredding mode, thereby improving the versatility and ease of operation of the equipment.

[0021] Optionally, the handle includes an operating lever, which is hollow and mounted on an adjusting arm. The locking part includes an unlocking lever, a spring, and a first positioning pin. The unlocking lever is slidably mounted inside the operating lever, and the spring is mounted inside the operating lever, with its lower end abutting against the operating lever and its upper end abutting against the unlocking lever. The first positioning pin is mounted at the lower end of the operating lever. The mounting part includes a mounting plate, which is mounted on the mounting bracket. The mounting plate has several positioning slots, and the first positioning pin can be inserted into the positioning slots.

[0022] By adopting the above technical solution, when operating the lever, hold the lever and press the unlock lever with your thumb. The unlock lever presses down against the spring of the operating lever, causing the first positioning pin to disengage from the last positioning groove. While holding the unlock lever, push the operating lever forward. The operating lever drives an adjusting arm to move, thereby realizing the overall position adjustment of the cutter head assembly, so that the cutter head assembly is adjusted to the preset position. Release the unlock lever, the spring returns to its original position, and the first positioning pin is inserted into the positioning groove, thereby locking the position of the cutter head assembly.

[0023] Optionally, the operating lever is provided with a stepped surface, and the locking part further includes a limiting plate. The limiting plate is disposed on the unlocking lever and slidably disposed inside the operating lever. The upper end of the spring abuts against the limiting plate, and the limiting plate can abut against the stepped surface.

[0024] By adopting the above technical solution, pressing the unlocking rod causes the limiting plate to contact the step surface. At this time, the first positioning pin completely disengages from the positioning groove, achieving a reliable unlocking action.

[0025] Optionally, the mounting plate is provided with a plurality of positioning holes, and the locking part further includes a second positioning pin, which is inserted into the positioning hole, and the operating rod can abut against the second positioning pin.

[0026] By adopting the above technical solution, the second positioning pin is inserted into the positioning hole corresponding to the appropriate height of the cutter head assembly. When the operating lever abuts against the second positioning pin, the position of the cutter head assembly is adjusted to the correct position, making operation convenient.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention, utilizing the structural characteristics of a larger opening and smaller curvature of the inferior arc groove, allows the sliding part to slide more smoothly and unimpeded from the mounting groove and detach into the avoidance straight groove under the action of external force during accidental collisions. It then moves along the groove, achieving reliable displacement avoidance and thus improving the structure's response sensitivity and overall safety under impact conditions. The proximity switch is positioned directly in the middle of the avoidance straight groove, providing the operator with sufficient reaction time and reducing the possibility of mechanical damage to the cutter head assembly and adjustment components.

[0028] 2. This invention employs a reset component to maintain the position of the blade assembly under the action of a tension spring during normal mowing, facilitating mowing. When the blade cover disengages from an obstacle, the blade assembly quickly resets, ensuring normal operation thereafter.

[0029] 3. In this invention, when adjusting the position of the cutter head assembly, the overall movement of the cutter head assembly is decomposed into movements along the height direction and the front-to-back direction. By setting an adjusting spring, the adjusting frame is driven to swing in the horizontal plane, keeping the transmission belt taut. The power assembly is positioned near the edge of the cutter head cover to reduce the tilting of the transmission belt caused by the adjustment of the cutter head assembly position. The lateral deviation force is counteracted by utilizing the adjusting spring, transition pulley, adjusting pulley, and the position of the power assembly. Attached Figure Description

[0030] Figure 1 This is an installation diagram of an embodiment of this application; Figure 2 This is a schematic diagram of the three-dimensional structure of an embodiment of this application. Figure 1 ; Figure 3 This is a three-dimensional structural diagram of an embodiment of this application after removing the blade assembly; Figure 4 This is an embodiment of the present application. Figure 3 A magnified view of part A in the diagram; Figure 5 This is a schematic diagram of the three-dimensional structure of an embodiment of this application. Figure 2 ; Figure 6 This is a cross-sectional perspective view of the regulating power component according to an embodiment of this application; Figure 7 This is a cross-sectional perspective view of the reset component according to an embodiment of this application; Figure 8 This is a three-dimensional structural diagram of the cutter head assembly according to an embodiment of this application; Figure 9 This is a three-dimensional structural diagram of the blade assembly in the grass-chopping mode according to an embodiment of this application.

[0031] Figure label: 100. Cutter head assembly; 110. Cutter head cover; 111. Top plate; 112. Blade cover; 113. Grass guide cover; 114. First channel; 115. Second channel; 116. First baffle; 117. Second baffle; 118. Front cover; 119. Hanging shaft; 120. Cutter blade; 130. Mowing drive wheel; 140. Drive belt; 150. Transition wheel; 160. Adjusting wheel; 170. Adjusting frame; 180. Adjusting spring; 190. Auxiliary wheel; 200. Adjustment assembly; 210. Adjustment arm; 211. Mounting slot; 212. Clearance slot; 220. Parallel rod; 230. Sliding part; 231. Sliding block; 232. Connecting rod; 240. Connecting shaft; 250. Return spring; 260. Connecting plate; 300. Adjustment power assembly; 310. Handle; 311. Operating lever; 312. Stepped surface; 313. Operating panel; 314. Track groove; 320. Mounting part; 321. Mounting plate; 322. Positioning groove; 323. Positioning hole; 324. Mounting shaft; 325. Transition arc surface; 330. Locking part; 331. Unlocking lever; 332. Spring; 333. First positioning pin; 334. Limiting plate; 335. Second positioning pin; 336. Button; 400. Reset assembly; 410. Guide cylinder; 420. Tension spring; 430. Guide rod; 500. Alarm component; 510. Proximity switch; 520. Alarm device; 600. Lawn mower; 610. Mounting bracket; 611. Hanging hole; 620. Front wheel; 630. Powertrain; 631. Engine; 632. Drive wheel; 640. Power rear wheel; 650. Pedal. Detailed Implementation

[0032] The following combination Figures 1 to 9 This application will be described in further detail.

[0033] refer to Figure 1 This embodiment provides an adjustable lawnmower blade, the overall structure of which includes a blade blade assembly 100, an adjustment component 200, an adjustment power component 300, several reset components 400, and an alarm component 500. The adjustment component 200, the adjustment power component 300, the reset components 400, and the alarm component 500 are mounted on a lawnmower 600. The blade blade assembly 100 is mounted on the adjustment component 200, the reset components 400 are mounted on the blade blade assembly 100, and the adjustment component 200 is mounted on the adjustment power component 300. The blade blade assembly 100 is connected to the lawnmower 600. The adjustment power component 300 provides power for the position adjustment of the blade blade assembly 100. The adjustment component 200 realizes the position adjustment of the blade blade assembly 100. The reset components 400 realize the position holding of the blade blade assembly 100 and its reset after detachment from an obstacle. The alarm component 500 issues an alarm when the blade blade assembly 100 encounters an obstacle.

[0034] refer to Figure 1The lawnmower 600 includes a mounting frame 610, two front wheels 620, a powertrain 630, two rear powered wheels 640, and a pedal 650. The front wheels 620 are mounted on the front end of the mounting frame 610, the rear powered wheels 640 are mounted on the rear end of the mounting frame 610, the powertrain 630 is mounted on the upper rear part of the mounting frame 610, and the pedal 650 is mounted on the middle of the rear end of the mounting frame 610. The adjustment assembly 200, the adjustment power assembly 300, the reset assembly 400, and the alarm assembly 500 are mounted on the mounting frame 610. The blade assembly 100 is connected to the output end of the powertrain 630.

[0035] refer to Figure 1 and 2 The powertrain 630 includes an engine 631 and a drive wheel 632. The engine 631 is mounted on the upper rear part of the mounting bracket 610, and the drive wheel 632 is mounted on the output shaft of the engine 631. The cutter head assembly 100 is connected to the drive wheel 632.

[0036] refer to Figure 2 The adjustment power assembly 300 includes a handle portion 310, a mounting portion 320, and a locking portion 330. The mounting portion 320 is mounted on the mounting bracket 610, and the handle portion 310 is locked to the mounting portion 320 by the locking portion 330. The handle portion 310 is rotatably connected to the adjustment assembly 200.

[0037] refer to Figure 3 and 4 The mounting part 320 includes two mounting plates 321 and several mounting shafts 324. The mounting shafts 324 are mounted on the mounting bracket 610, and the mounting plates 321 are mounted on the mounting shafts 324. The mounting plates 321 are provided with several positioning grooves 322 and several positioning holes 323. The mounting plates 321 are provided with transition arc surfaces 325 corresponding to several positioning grooves 322. The transition arc surface 325 includes three parts, wherein the two ends are tangent to the corresponding positioning grooves 322 respectively, and the middle parts of all the transition arc surfaces 325 are on the same circumference. The positioning grooves 322 include semi-circular grooves and inclined grooves, and the centers of all the semi-circular grooves are on the same circumference.

[0038] refer to Figure 3 The handle 310 includes an operating lever 311 and an operating plate 313. The operating lever 311 is mounted on the operating plate 313, and the operating plate 313 is rotatably connected to the adjustment assembly 200.

[0039] refer to Figure 4-6The locking part 330 includes an unlocking rod 331, a spring 332, a first positioning pin 333, a limiting plate 334, a second positioning pin 335, and a button 336. The operating rod 311 has a hollow structure and a stepped surface 312. The operating plate 313 has a track groove 314. The unlocking rod 331 is slidably disposed within the operating rod 311. The button 336 is installed at the upper end of the unlocking rod 331. The limiting plate 334 is installed at the upper part of the unlocking rod 331 and is slidably disposed within the operating plate 336. The operating rod 311 is able to abut against the stepped surface 312. The spring 332 is disposed in the operating rod 311, with its upper end abutting against the limiting plate 334, looping around the unlocking rod 331, and its lower end abutting against the operating rod 311. The first positioning pin 333 is installed at the lower end of the unlocking rod 331, slidably disposed in the track groove 314, and can be inserted into the positioning groove 322. The second positioning pin 335 is inserted into the positioning hole 323, and the operating plate 313 can abut against the second positioning pin 335.

[0040] refer to Figure 3 The adjustment assembly 200 includes four adjusting arms 210, two parallel rods 220, four sliding parts 230, two connecting shafts 240, a plurality of connecting plates 260, and a number of return springs 250 equal to the number of connecting plates 260. The two ends of the connecting shafts 240 are rotatably connected to the mounting brackets 610. The adjusting arms 210 are mounted on the ends of the connecting shafts 240. The two ends of the parallel rods 220 are rotatably connected to the adjusting arms 210. The operating plate 313 is mounted on the corresponding adjusting arm 210. The slide part 230 has an installation groove 211 and a clearance groove 212. The installation groove 211 is a minor arc groove. The upper end of the slide part 230 is inserted into the installation groove 211 and can slide along the clearance groove 212. The connecting plate 260 is installed on the front connecting shaft 240. One end of the return spring 250 is hooked on the connecting plate 260. The mounting bracket 610 has several hanging holes 611. The other end of the return spring 250 is hooked in the hanging holes 611. The cutter head assembly 100 is installed at the lower end of the slide part 230.

[0041] refer to Figure 5 The sliding part 230 includes a sliding block 231 and a connecting rod 232. The sliding block 231 is installed on the upper end of the connecting rod 232. The sliding block 231 is inserted into the mounting groove 211 and can slide along the clearance straight groove 212. The lower end of the connecting rod 232 is installed on the cutter head assembly 100.

[0042] refer to Figure 2-6In the initial state, the sliding block 231 is in the mounting groove 211, the first positioning pin 333 is inserted into the last side positioning groove 322, and the second positioning pin 335 is inserted into the last side positioning hole 323, with the cutter head assembly 100 at the uppermost end of its stroke. When adjusting the height of the cutter head assembly 100, the second positioning pin 335 is removed and inserted into the positioning hole 323 corresponding to the corresponding height of the cutter head assembly 100. Holding the operating lever 311, the thumb presses the button 336. The button 336 moves the unlocking lever 331, the limiting plate 334, and the first positioning pin 33 (which swings along the track groove 314). The limiting plate 334 and the operating lever 331 compress the spring 332 until the limiting plate 334 contacts the stepped surface 312. The first positioning pin 333 disengages from the positioning groove 322. The operating lever 311 swings forward, causing the operating plate 313 and the locking part 330 (except for the second positioning pin 335) to swing forward. The operating plate 313 causes the rear adjusting arm 210 to swing. The rear connecting shaft 240 is rotated, which in turn causes the other rear adjusting arm 210 to swing. The rear adjusting arm 210 then causes the parallel rod 220 to swing, which in turn causes the front adjusting arm 210 to swing. The front adjusting arm 210 then causes the front connecting shaft 240 to swing, which in turn causes the connecting plate 260 to swing. The connecting plate 260 compresses the reset spring 250 until the operating plate 313 abuts against the second positioning pin 335. The operating lever 311 is held in place, and the button 336 is slowly released. The spring 332 returns to its original position, and the first positioning pin 333 enters the corresponding positioning groove 322, thus achieving height adjustment.

[0043] During the swing operation lever 311, if the limiting plate 334 is in constant contact with the step surface 312, the first positioning pin 333 will only contact the middle part of the transition arc surface 325. If loosening occurs, when the transition arc surface 325 is close to the end that is disengaged from the positioning groove 322, under its squeezing action, the first positioning pin 333 will drive the unlocking lever 331 and the limiting plate 334, so that the limiting plate 334 will gradually contact the step surface 312. When the first positioning pin 333 contacts the middle part of the transition arc surface 325, the limiting plate 334 will remain in contact with the step surface 312. The same applies when swinging the operating lever 311 in the opposite direction.

[0044] refer to Figure 2-6 During the mowing process, when the front wheel 620 successfully overturns the obstacle and the vehicle body tends to be level, when the blade assembly 100 contacts the obstacle, under the resistance of the obstacle, the blade assembly 100 drives the sliding part 230 to disengage from the mounting groove 211 and enter the clearance groove 212, so that the blade assembly 100 moves backward relative to the mower 600.

[0045] Utilizing the structural characteristics of a larger opening and smaller curvature of the inferior arc groove, in the event of an accidental collision, the sliding part 230 can slide out and detach more smoothly and unimpeded from the groove opening of the mounting groove 211 under the action of external force. This effectively avoids jamming caused by excessive curvature of the groove, thus ensuring that the sliding part 230 can quickly and accurately enter the avoidance straight groove 212, achieving reliable displacement avoidance, thereby improving the structural response sensitivity and overall safety under impact conditions. This also reduces the possibility of mechanical damage to the cutter head assembly 100 and the adjustment assembly 200.

[0046] refer to Figure 7 The reset assembly 400 includes a guide cylinder 410, a tension spring 420, and a guide rod 430. One end of the guide cylinder 410 is rotatably mounted on the mounting bracket 610. One end of the tension spring 420 and the guide rod 430 are disposed inside the guide cylinder 410. One end of the tension spring 420 is connected to the guide cylinder 410, and the other end is connected to the guide rod 430. The guide rod 430 is rotatably connected to the cutter head assembly 100.

[0047] refer to Figure 7 The tension spring 420 is always kept in the stretched state. The tension spring 420 pulls the cutter head assembly 100 forward. When the height of the cutter head assembly 100 is adjusted, the return spring 250 is squeezed. The return spring 250 gives the adjusting arm 210 a tendency to swing backward, so that the sliding part 230 is kept in the mounting groove 211.

[0048] refer to Figure 7 When adjusting the height of the cutter head assembly 100, the cutter head cover 110 drives the guide rod 430 to swing and move along the guide cylinder 410, and the guide rod 430 drives the tension spring 420 to move. When encountering an obstacle, the cutter head assembly 100 moves backward, causing the tension spring 420 to be further stretched. After the cutter head assembly 100 disengages from the obstacle, the tension spring 420 returns to its original position, driving the cutter head assembly 100 to move forward, causing the cutter head assembly 100 to drive the sliding part 230 to move along the clearance groove 212 into the mounting groove 211, so that the cutter head assembly 100 returns to its original position.

[0049] refer to Figure 8The blade assembly 100 includes a blade cover 110, a plurality of blades 120, a mowing drive wheel 130 equal in number to the blades 120, a drive belt 140, a transition wheel 150, an adjusting wheel 160, an adjusting frame 170, an adjusting spring 180, and a plurality of auxiliary wheels 190. The blade cover 110 is mounted on the lower end of the connecting rod 232. The guide rod 430 is rotatably connected to the blade cover 110. The mowing drive wheel 130 is bearing-connected to the blade cover 110 and can rotate around its axis. The blades 120 are mounted on the mowing drive wheel 130. The transition wheel... A bearing 150 is connected to the cutter head cover 110 and can rotate around its axis. One end of the adjusting frame 170 is rotatably connected to the cutter head cover 110. The adjusting wheel 160 is connected to the middle of the adjusting frame 170 and can rotate around its axis. One end of the adjusting spring 180 is connected to the other end of the adjusting frame 170, and the other end is connected to the cutter head cover 110. The transmission belt 140 surrounds the mowing power wheel 130, the transition wheel 150, the adjusting wheel 160, and the main power wheel 632. The auxiliary wheel 190 is installed on the front side of the cutter head cover 110.

[0050] refer to Figure 8 During mowing, the operator stands on pedal 650 and controls the rear drive wheel 640 to rotate, propelling the device forward. The engine 631 drives the transmission belt 140, which in turn rotates the mowing drive wheel 130, transition wheel 150, and adjusting wheel 160. The mowing drive wheel 130 then rotates the dry cutter blade 120, which in turn cuts the grass. When adjusting the position of the cutter head assembly 100, the overall movement of the cutter head assembly 100 is decomposed into movement along the height and forward / backward directions (the transmission belt 140 loops around one end of the drive wheel 632, with its height remaining almost constant). An adjusting spring 180 is used to allow the adjusting frame 170 to swing horizontally, keeping the transmission belt 140 taut. The power assembly 630 is positioned near the edge of the cutter head cover 110 to reduce the tilting of the transmission belt 140 during cutter head assembly 100 position adjustments (this is a common industry practice). The lateral deviation force is counteracted by adjusting the positions of the spring 180, the transition wheel 150, the adjusting wheel 160, and the powertrain 630.

[0051] refer to Figure 9The cutter head cover 110 includes a top plate 111, a cutter cover 112, a grass guide cover 113, a first baffle 116, a second baffle 117, a front cover 118, and a hanging shaft 119. The upper side of the top plate 111 is mounted on the lower end of the connecting rod 232. The guide rod 430 and the adjusting frame 170 are rotatably connected to the top plate 111. The mowing power wheel 130, the transition wheel 150, and the adjusting wheel 160 are bearing connected to the top plate 111. The hanging shaft 119 is mounted on the top plate 111. The end of the adjusting spring 180 away from the adjusting frame 170 is hooked onto the hanging shaft 119. The cutter cover 112 and the grass guide cover... 113 is installed on the lower side of the top plate 111, and the adjacent blade covers 112 are connected in sequence. The blade cover 112 is provided with a first channel 114, and the grass guide cover 113 is provided with a second channel 115. The blade cover 112, the first channel 114, the second channel 115 and the grass guide cover 113 form a grass guiding channel. The first baffle 116 is inserted into the first channel 114 and installed on the lower side of the top plate 111. The second baffle 117 is inserted into the second channel 115 and installed on the lower side of the top plate 111. The front cover 118 is installed on the top plate 111, and the auxiliary wheel 190 is installed on the front side of the front cover 118.

[0052] refer to Figure 9 During mowing, the mowing drive wheel 130 rotates at high speed to perform the mowing operation. The cut grass stems, driven by the centrifugal force and airflow generated by the rotation of the mowing drive wheel 130, are first smoothly guided into the first channel 114 along the inner wall of the blade cover 112, and then discharged from the grass guide cover 113 through the second channel 115, thereby achieving efficient grass collection and orderly grass discharge, effectively avoiding grass blockage. When shredding grass, the first baffle 116 and the second baffle 117 are installed. The first baffle 116 and the second baffle 117 close the grass guide channel, realizing the conversion from mowing mode to grass shredding mode, improving the versatility and ease of operation of the equipment.

[0053] refer to Figure 1 and 2 The alarm assembly 500 includes at least one proximity switch 510 and an alarm 520. The proximity switch 510 is mounted on the mounting bracket 610, facing the middle of the clearance groove 212. The alarm 520 is mounted on the mounting bracket 610. The proximity switch 510 and the alarm 520 are electrically connected.

[0054] refer to Figure 1 and 2When the sliding block 231 moves along the clearance groove 212 and finally faces the proximity switch 510, the proximity switch 510 is triggered and generates a sensing signal, which then controls the alarm 520 to issue a warning. This allows for timely intervention by the operator, significantly improving the safety level of the equipment. The proximity switch 510 is positioned a distance from the clearance groove 212, providing the operator with sufficient reaction time.

[0055] The working principle of this embodiment is as follows: In the initial state, the sliding block 231 is in the mounting groove 211, the first positioning pin 333 is inserted into the last positioning groove 322, and the second positioning pin 335 is inserted into the last positioning hole 323. The cutter head assembly 100 is at the uppermost end of its stroke. When adjusting the height of the cutter head assembly 100, the second positioning pin 335 is removed and inserted into the positioning hole 323 corresponding to the corresponding height of the cutter head assembly 100. Holding the operating lever 311, the thumb presses the button 336. The button 336 moves the unlocking lever 331, the limiting plate 334, and the first positioning pin 33 (which swings along the track groove 314). The limiting plate 334 and the operating lever 331 compress the spring 332 until the limiting plate 334 contacts the stepped surface 312. The first positioning pin 333 disengages from the positioning groove 322. The operating lever 311 swings forward, causing the operating plate 313 and the locking part 330 (except for the second positioning pin 335) to swing forward. The operating plate 313 causes a rear adjusting arm 210 to swing, and the rear adjusting arm 210 causes the rear... The side connecting shaft 240 rotates, causing the rear connecting shaft 240 to swing the other rear adjusting arm 210. The rear adjusting arm 210 then swings the parallel rod 220, which in turn swings the front adjusting arm 210. The front adjusting arm 210 then swings the front connecting shaft 240, which in turn swings the connecting plate 260. The connecting plate 260 compresses the reset spring 250, causing the adjusting arm 210 to swing the sliding part 230. The sliding part 230 then swings the cutter head cover 110, which in turn swings the guide rod 430 while moving along the guide cylinder 410. The guide rod 430 then moves the tension spring 420. The operation plate 313 abuts against the second positioning pin 335. Holding the operating lever 311, the button 336 is slowly released, the spring 332 returns to its original position, and the first positioning pin 333 enters the corresponding positioning groove 322, achieving height adjustment.

[0056] During mowing, the rear drive wheel 640 is rotated to propel the device forward. The engine 631 is controlled to operate, driving the transmission belt 140. The transmission belt 140 drives the mowing drive wheel 130, transition wheel 150, and adjusting wheel 160 to rotate. The mowing drive wheel 130 drives the dry cutter 120 to rotate, thus mowing the grass. The high-speed rotation of the mowing drive wheel 130 performs the mowing operation. The cut grass stems, driven by the centrifugal force and airflow generated by the rotation of the mowing drive wheel 130, are first smoothly guided along the inner wall of the blade cover 112 into the first channel 114, and then discharged from the guide cover 113 through the second channel 115.

[0057] During the mowing process, when the front wheel 620 successfully overcomes an obstacle and the vehicle body becomes level, the blade assembly 100 contacts the obstacle. Under the resistance of the obstacle, the blade assembly 100 drives the sliding part 230 to disengage from the mounting groove 211 and enter the clearance groove 212, causing the blade assembly 100 to move backward relative to the mower 600. When the sliding block 231 moves along the clearance groove 212 and finally faces the proximity switch 510, the proximity switch 510 is triggered and generates a sensing signal, which then controls the alarm 520 to issue a warning, thus promptly reminding the operator to intervene.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An adjustable lawnmower blade, characterized in that, include: The cutter head assembly (100), the adjustment assembly (200), and the adjustment power assembly (300); The adjustment assembly (200) includes four adjustment arms (210), two parallel rods (220), and four sliding parts (230). The adjustment arms (210) are rotatably mounted on the mounting frame (610). The two ends of the parallel rods (220) are rotatably connected to the adjustment arms (210). The adjustment arms (210) are provided with mounting grooves (211) and clearance grooves (212). The upper end of the sliding part (230) is inserted into the mounting groove (211) and can slide along the clearance grooves (212). The cutter head assembly (100) includes a cutter head cover (110), which is disposed at the lower end of the sliding part (230); The adjustment power assembly (300) includes a handle (310), a mounting part (320) and a locking part (330). The mounting part (320) is disposed on the mounting bracket (610), and the lower end of the handle (310) is disposed on an adjustment arm (210). The locking part (330) locks the handle (310) onto the mounting part (320).

2. The adjustable mowing blade according to claim 1, characterized in that: The mounting groove (211) is a minor arc groove.

3. The adjustable mowing blade according to claim 2, characterized in that: It also includes several reset components (400), each reset component (400) including a guide cylinder (410), a tension spring (420) and a guide rod (430). One end of the guide cylinder (410) is rotatably mounted on the mounting bracket (610). One end of the tension spring (420) and the guide rod (430) are disposed inside the guide cylinder (410). One end of the tension spring (420) is connected to the guide cylinder (410), and the other end is connected to the guide rod (430). The guide rod (430) is rotatably mounted on the cutter head cover (110).

4. The adjustable mowing blade according to claim 3, characterized in that: It also includes an alarm component (500), which includes at least one proximity switch (510) and an alarm (520). The proximity switch (510) is mounted on the mounting bracket (610) and faces the middle of the clearance groove (212). The alarm (520) is mounted on the mounting bracket (610). The proximity switch (510) and the alarm (520) are electrically connected.

5. The adjustable mowing blade according to claim 3 or 4, characterized in that: The blade assembly (100) further includes a plurality of blades (120), a mowing drive wheel (130) of the same number as the blades (120), a drive belt (140), a transition wheel (150), an adjusting wheel (160), an adjusting frame (170), and an adjusting spring (180). The mowing drive wheel (130) is rotatably mounted on the blade cover (110) and can rotate around its axis. The blades (120) are mounted on the mowing drive wheel (130). The transition wheel (150) is rotatably mounted on the blade cover (110) and can rotate around its axis. The adjusting frame... One end of (170) is rotatably mounted on the blade cover (110), the adjusting wheel (160) is rotatably mounted in the middle of the adjusting frame (170) and can rotate around its axis, one end of the adjusting spring (180) is mounted on the other end of the adjusting frame (170) and the other end is mounted on the blade cover (110), the transmission belt (140) surrounds the mowing power wheel (130), the transition wheel (150), the adjusting wheel (160) and the output end of the power assembly (630), and the power assembly (630) is mounted on the mounting frame (610).

6. The adjustable mowing blade according to claim 5, characterized in that: The blade cover (110) includes a top plate (111), a blade cover (112), and a grass guide cover (113). The top plate (111) is located on the upper side of the lower end of the sliding part (230). The guide rod (430), the mowing power wheel (130), the transition wheel (150), the adjusting wheel (160), and the adjusting frame (170) are rotatably mounted on the top plate (111). The adjusting spring (180) is located away from the adjusting frame (170). The end is set on the top plate (111), the blade cover (112) and the grass guide cover (113) are set on the lower side of the top plate (111), the adjacent blade covers (112) are connected in sequence, the blade cover (112) is provided with a first channel (114), the grass guide cover (113) is provided with a second channel (115), and the blade cover (112), the first channel (114), the second channel (115) and the grass guide cover (113) form a grass guiding channel.

7. The adjustable mowing blade according to claim 6, characterized in that: The cutter head cover (110) also includes a first baffle (116) and a second baffle (117). The first baffle (116) is inserted into the first channel (114) and is disposed on the lower side of the top plate (111). The second baffle (117) is inserted into the second channel (115) and is disposed on the lower side of the top plate (111).

8. The adjustable mowing blade according to any one of claims 1-4, characterized in that: The handle part (310) includes an operating lever (311), which is hollow and is mounted on an adjusting arm (210). The locking part (330) includes an unlocking lever (331), a spring (332), and a first positioning pin (333). The unlocking lever (331) is slidably mounted inside the operating lever (311). The spring (332) is mounted inside the operating lever (311), with its lower end abutting against the operating lever (311) and its upper end abutting against the unlocking lever (331). The first positioning pin (333) is mounted at the lower end of the operating lever (311). The mounting part (320) includes a mounting plate (321), which is mounted on the mounting bracket (610). The mounting plate (321) has several positioning slots (322), and the first positioning pin (333) can be inserted into the positioning slots (322).

9. The adjustable mowing blade according to claim 8, characterized in that: The operating lever (311) is provided with a stepped surface (312), and the locking part (330) also includes a limiting plate (334). The limiting plate (334) is disposed on the unlocking lever (331) and slidably disposed within the operating lever (311). The upper end of the spring (332) abuts against the limiting plate (334), and the limiting plate (334) can abut against the stepped surface (312).

10. The adjustable mowing blade according to claim 8, characterized in that: The mounting plate (321) is provided with a plurality of positioning holes (323), and the locking part (330) further includes a second positioning pin (335), the second positioning pin (335) is inserted into the positioning hole (323), and the operating rod (311) can abut against the second positioning pin (335).

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