Blade device for lawn mower and use method thereof

Abstract

The present invention belongs to the technical field of lawn mower blades, and specifically relates to a blade device for a lawn mower and a method of using the blade. Existing lawn mowers can generally only mow lawns at the same height during use, which has certain limitations. For lawns with different mowing height requirements, the cutting blades are generally disassembled and installed at different heights, which reduces the mowing efficiency. The present invention comprises a control box, a locking tooth groove is provided on the side of the control box, the locking tooth groove is matched and connected to a locking gear, a special-shaped groove is provided on the side of the locking gear away from the control box, the special-shaped groove is fixedly connected to a moving block, a special-shaped rotating shaft is fixedly installed on the side of the moving block, the special-shaped rotating shaft passes through a linkage square plate and is fixedly connected to a rotating handle, and the special-shaped rotating shaft is transmission-connected to the linkage square plate; fixing slots are provided on both sides of the linkage square plate, and the fixing slots are connected to a force control member, thereby improving the mowing efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of lawn mower blades, and in particular relates to a blade device for a lawn mower and a use method thereof. Background Art

[0002] A lawn mower, also known as a weed cutter, lawn mower, lawn trimmer, etc., is a mechanical tool used to trim lawns, vegetation, etc. It is composed of a cutter disc, an engine, a running wheel, a walking mechanism, a blade, an armrest, and a control part. The cutter disc is mounted on the running wheel, the cutter disc is equipped with an engine, and the blade is mounted on the output shaft of the engine. The blade utilizes the high-speed rotation of the engine to increase the speed a lot, which saves the working time of the weeding workers and reduces a lot of human resources.

[0003] As one of the commonly used gardening tools, lawn mowers are often used for lawn mowing. However, existing lawn mowers can generally only mow lawns at the same height during use, which has certain limitations. For lawns with different mowing height requirements, the cutting blades are generally disassembled and installed at different heights, which reduces the mowing efficiency. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a blade device for a lawn mower and a method of using the blade device, which effectively solves the problems in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a blade device for a lawn mower, comprising a control box, a locking tooth groove is provided on the side of the control box, the locking tooth groove is matched with a locking gear, a special-shaped groove is provided on the side of the locking gear away from the control box, the special-shaped groove is fixedly connected to the moving block, a special-shaped rotating shaft is fixedly installed on the side of the moving block, the special-shaped rotating shaft passes through a linkage square plate and is fixedly connected to a rotating handle, and the special-shaped rotating shaft is transmission-connected to the linkage square plate; locking slots are provided on both sides of the linkage square plate, and the locking slots are connected to the force control member; a positioning round rod is installed on the linkage square plate, one end of the positioning round rod is fixedly connected to the side of the control box, and the other end passes through the linkage square plate and is fixedly connected to the first limit plate, a positioning spring is sleeved on the positioning round rod, one end of the positioning spring is fixedly connected to the side of the control box, and the other end is fixedly connected to the side of the linkage square plate; a meshing rotating shaft is fixedly installed on the side of the locking gear close to the control box, and the meshing rotating shaft is connected to the meshing tooth unit;

[0006] The meshing gear unit includes a locking rotating rod movably connected to the meshing rotating shaft, the end of the locking rotating rod away from the rotating handle is connected to the first bearing, the first bearing is fixedly connected to the inner side of the control box, an extrusion spring is sleeved on the meshing rotating shaft, one end of the extrusion spring is fixedly connected to the side of the first circular plate, the first circular plate is fixedly connected to the outer side wall of the meshing rotating shaft, the other end of the extrusion spring is fixedly connected to the second circular plate, the side of the second circular plate away from the first bearing is fixedly connected to the linkage circular plate, and the outer side wall of the linkage circular plate is connected to the second bearing It is arranged that the side surfaces of the linkage circular plate and the second bearing are fixedly connected to the inner side surface of the control box; elastic rods are symmetrically installed on the side walls of the engaging rotating rod, the elastic rods are fixedly connected to the engaging cross block, a return spring is sleeved on the elastic rod, one end of the return spring is fixedly connected to the side wall of the engaging rotating rod, and the other end is fixedly connected to the bottom surface of the engaging cross block; the sliding groove provided on the engaging cross block is slidably connected to the sliding rail provided on the inner side wall of the engaging rotating shaft; a driving bevel gear is fixedly installed on the engaging rotating rod, and the driving bevel gear is connected to the driving transmission mechanism.

[0007] Preferably, the driving force transmission mechanism includes a rotating bevel gear meshingly connected to the driving bevel gear, and a driving threaded shaft is installed on the rotating bevel gear, and two ends of the driving threaded shaft are fixedly connected to the third bearing, and the side of the third bearing is fixedly connected to the inner top surface and inner bottom surface of the control box; a driving plate is threadedly installed on the driving threaded shaft, and a limiting plate is fixedly installed on the side of the driving plate, and the limiting plate is connected to the limiting groove provided on the inner side surface of the control box, and a limiting rod is installed on the limiting plate, and two ends of the limiting rod are fixedly connected to the top surface and bottom surface of the limiting groove, and a limiting spring is sleeved on the limiting rod, one end of the limiting spring is connected to the top surface of the limiting groove, and the other end is connected to the top surface of the limiting plate; a driving motor is fixedly installed on the top surface of the driving plate, and the output end of the driving motor passes through the driving plate and is fixedly connected to the cutting blade; a stabilizing rack is fixedly installed on the side of the control box.

[0008] Preferably, the stabilizing rack is meshedly connected to a linkage gear, a linkage rotating shaft is installed on the linkage gear, the linkage rotating shaft passes through the auxiliary base and is connected to the active bevel gear, the bottom surface of the auxiliary base is fixedly connected to the top surface of the driving plate, and the linkage rotating shaft is transmission-connected to the auxiliary base; the active bevel gear is meshedly connected to the driven bevel gear, the driven bevel gear is connected to the compound frequency drive component, the driven bevel gear is meshedly connected to the linkage bevel gear, and the linkage bevel gear is connected to the limiting unit.

[0009] Preferably, the force control member includes an inclined fixed rod connected to the fixing slot, and a driving rotating rod is fixedly installed on one end of the inclined fixed rod close to the control box, and both ends of the driving rotating rod are transmission-connected to the inner side surface of the special-shaped block, and the bottom surface of the special-shaped block is fixedly connected to the side surface of the control box; a guide cross bar is installed on the special-shaped block, and the two ends of the guide cross bar pass through the special-shaped block and are fixedly connected to the side surface of the control base, and the bottom surface of the control base is fixedly connected to the side surface of the control box; a sliding block is slidably installed on the guide cross bar, and a distributing rod is installed on the top surface of the sliding block, and one end of the distributing rod close to the linkage square plate is movably connected to a connecting rod installed on the square groove on the inclined fixed rod; a guide spring is sleeved on the guide cross bar, and one end of the guide spring is fixedly connected to the side surface of the control base, and the other end is fixedly connected to the side surface of the sliding block.

[0010] Preferably, the intermittent frequency-controlled component includes a driven rotating shaft arranged on the driven bevel gear, one end of the driven rotating shaft is transmission-connected to a driven base provided on the top surface of the driving plate, and the other end is fixedly connected to the side of the constant rotating block, the constant rotating block is connected to the constant rotating groove provided on the compound moving circular plate, a support seat is installed on the outer side wall of the compound moving circular plate, and the support seat is fixedly connected to the top surface of the driving plate; an I-beam is fixedly installed on the side of the constant rotating block away from the control box, the I-beam is movably connected to the rectangular groove provided on the rectangular plate, intermittent cross plates are installed on both sides of the rectangular plate, brake grooves are provided on the top and bottom surfaces of the intermittent cross plates, a pulley is movably connected to the brake groove, and the pulley and the compound moving circular plate are transmission-connected by a sliding shaft.

[0011] Preferably, a movable rack is fixedly installed on the side of the intermittent horizontal plate, the movable rack is meshed with a rotating gear, a rotating shaft is fixedly installed on the rotating gear, and both ends of the rotating shaft are transmission-connected to the inner side of the auxiliary box; an elliptical plate is fixedly installed on the rotating shaft, the elliptical plate cooperates to connect the special-shaped rod, the special-shaped rod passes through the auxiliary box and is connected to the side of the driving plate, a driving spring is sleeved on the special-shaped rod, one end of the driving spring is fixedly connected to the inner side of the auxiliary box, and the other end is fixedly connected to the side of the L-plate, and the side of the L-plate is fixedly connected to the inner side of the auxiliary box; the two special-shaped rods are commonly connected to a connecting rod, and the connecting rod is connected to the defense mechanism.

[0012] Preferably, the limit unit includes a limit shaft arranged on a linked bevel gear, the limit shaft passes through a limit base arranged on the top surface of the driving plate and is connected to the first bevel gear, the first bevel gear is meshed and connected to the two second bevel gears, and a stable threaded shaft is installed on the second bevel gear, and one end of the stable threaded shaft away from the control box is transmission connected to the side of the fixed plate, and the side of the fixed plate is fixedly connected to the side of the limit base; a control plate is threadedly installed on the stable threaded shaft, and a positioning rod is installed on the control plate, and the positioning rod passes through the fixed plate and is fixedly connected to the side of the limit circular plate; a compression spring is sleeved on the positioning rod, one end of the compression spring is fixedly connected to the side of the fixed plate, and the other end is fixedly connected to the side of the limit circular plate; a limit block is installed on the top surface of the control plate, and the limit block is matched with a lock groove provided on the side of the control box and connected.

[0013] Preferably, the defense mechanism includes an auxiliary rack arranged on the side wall of the connecting rod, the auxiliary rack is meshed and connected to the auxiliary gear, an auxiliary rotating shaft is fixedly installed on the side of the auxiliary gear, the auxiliary rotating shaft passes through the stable base and is connected to the first bevel gear, and the top surface of the stable base is fixedly connected to the bottom surface of the auxiliary box; the first bevel gear is meshed and connected to the second bevel gear, and the second bevel gear is fixedly installed with an engaging rotating shaft, one end of the engaging rotating shaft is connected to the linkage base, the side of the linkage base is fixedly connected to the side of the stable base, and the other end is connected to the double-acting gear, and the double-acting gear is meshed and connected to two constant racks.

[0014] Preferably, the two ends of the constant rack pass through the auxiliary vertical plate and are fixedly connected to the side of the second limiting plate, and the side of the auxiliary vertical plate is fixedly connected to the side of the auxiliary box; a guide rod is installed on the auxiliary vertical plate, one end of the guide rod is fixedly connected to the side of the auxiliary vertical plate, and the other end is fixedly connected to the side of the third limiting plate, and a tension spring is sleeved on the guide rod, and the two ends of the tension spring are fixedly connected to the side of the auxiliary vertical plate; a T-plate is fixedly installed on the top surface of the second limiting plate, and an anti-motion block is installed on the side of the T-plate, and the anti-motion block is matched with the anti-linking slot provided on the side of the auxiliary box.

[0015] The present invention also provides a method for using a blade for a lawn mower, comprising the following steps:

[0016] Step 1: Pull the rotating handle outward to drive the locking gear to disengage from the lock tooth groove to release the limit setting on it, so that the distance between the first circular plate and the second circular plate is shortened, and then the engaging horizontal block on the side wall of the clamping rotating rod moves in the slide rail on the inner side wall of the meshing rotating shaft, and the reset spring and the elastic rod reset to make the two engaging horizontal blocks clamp the slots on the meshing rotating shaft;

[0017] Step 2: After the handle is turned to drive the linkage square plate to move to a certain position, the inclined fixed rod is released, and the inclined fixed rod is hinged and rotated in the special-shaped block, and at the same time, the sliding block is driven to move within the guide cross bar within a limited position, and the matching rod is hinged and rotated on the connecting rod, and at the same time, the guide spring is driven to reset, so that the cross block on the inclined fixed rod enters the locking slot on the linkage square plate, and the linkage square plate is fixed in the current position;

[0018] Step 3: By operating the rotating handle, the driving bevel gear on the card rotating rod is meshed with the rotating bevel gear to rotate, so that the driving plate on the driving threaded shaft is lifted or lowered. When the driving plate is lifted or lowered, the linkage gear meshed with the stable rack rotates, so that the I-beam drives the intermittent cross plate to move back and forth left and right, so that the moving rack moves and the meshing rotating gear rotates at the same time;

[0019] Step 4: Since the elliptical plates on both sides of the driving plate are in a vertically flipped state, when the elliptical plates contact the special-shaped rods, the special-shaped rods are moved outward, so that the driving spring is in a compressed state, and at the same time, the other end of the special-shaped rods no longer contacts the side of the driving plate. When the elliptical plates no longer contact the special-shaped rods, the driving springs are reset, so that the two special-shaped rods touch the side of the driving plate at the same time, so that the side of the driving plate is in a high-frequency micro-vibration state, so that the grass leaf fragments and other debris attached to the cutting blade on the driving plate fall off and no longer adhere to the cutting blade;

[0020] Step 5: The cutting blade on the driving plate is adjusted to different heights. By starting the driving motor, the output end of the driving motor drives the cutting blade to rotate, and the lawn with different height requirements can be mowed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The elliptical plates on both sides of the driving plate are in a vertically flipped state, so that the two elliptical plates are synchronously and continuously contacting the special-shaped rod on the rotating shaft; when the elliptical plates contact the special-shaped rod, the special-shaped rod moves outward, so that the driving spring is in a compressed state, and at the same time, the other end of the special-shaped rod no longer contacts the side of the driving plate; when the elliptical plates no longer contact the special-shaped rod, the driving spring is reset, so that the two special-shaped rods touch the side of the driving plate at the same time, so that the side of the driving plate is in a high-frequency micro-vibration state, so that the grass leaf fragments and other debris adhered to the cutting blade on the driving plate fall off and no longer adhere to the cutting blade, thereby improving the efficiency of mowing the lawn;

[0023] (2) After the handle is turned to drive the linkage square plate to move to a certain position, the inclined fixed rod is released, and the inclined fixed rod is hinged and rotated in the special-shaped block, and at the same time, the sliding block is limitedly moved in the guide cross bar, so that the matching rod is hinged and rotated on the connecting rod, and at the same time, the guide spring is reset, so that the cross block on the inclined fixed rod enters the locking slot on the linkage square plate, thereby fixing the linkage square plate in the current position, so that the operator can rotate stably when operating the handle;

[0024] (3) The operator rotates the handle to drive the meshing shaft on the locking gear to rotate, so that the driving bevel gear on the locking rod meshes with the rotating bevel gear to rotate, so that the driving plate on the driving threaded shaft is lifted and lowered, and the limiting plates on both sides are limited in the limiting rods provided on the limiting grooves to lift and lower, so that the limiting spring is in a compressed state, so that the cutting blade on the driving plate is adjusted to different heights. By starting the driving motor, the output end of the driving motor drives the cutting blade to trim lawns with different height requirements, thereby improving the trimming efficiency;

[0025] When the cam is in the locked position, the two locking plates are engaged with the locking gear, and the locking gear is reset to the locking gear groove, thereby preventing the cam from rotating and the locking gear from rotating.

[0026] (5) The double-acting gear on the movable shaft meshes with the two constant racks, so that the two constant racks move stably through the guide rod, so that the tension spring is in a compressed state, and at the same time, the two anti-movement blocks move relatively, and the anti-linking slots on the side of the auxiliary box are connected in a coordinated manner, so that the special-shaped rod is limited when it moves outward to the maximum distance and is still moving, thereby improving the safety of the compound frequency motion component during movement;

[0027] (6) The threads on the two stabilizing threaded shafts are opposite, so that when the driving plate rises, the control plate on the end close to the rotating handle moves toward the control box, and the control plate on the end close to the cutting blade moves away from the control box. Both control plates are limited by the positioning rod, so that one compression spring is in a compressed state and the other is in a stretched state. When the driving plate rises to the maximum position, the limit block moving in the direction close to the control box enters the lock slot to limit it, so that after the cutting blade is adjusted to the highest or lowest point, it is more stable during trimming; BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0029] In the attached picture:

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the meshing gear unit of the present invention;

[0032] Figure 3 This is one of the main structural schematic diagrams of the present invention;

[0033] Figure 4 It is a partial structural schematic diagram of the present invention;

[0034] Figure 5 It is a schematic cross-sectional view of the structure of the meshing gear unit of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the force control member of the present invention;

[0036] Figure 7 This is the second schematic diagram of the main structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the first part of the compound intermittent frequency motion component of the present invention;

[0038] Fig. 9 This is a schematic diagram of the structure of the second part of the compound intermittent frequency motion component of the present invention;

[0039] Fig.10 This is a schematic diagram of the structure of the third part of the compound intermittent frequency motion component of the present invention;

[0040] Fig.11 This is a schematic diagram of the structure of the position control and prevention mechanism of the present invention;

[0041] Fig.12 It is a schematic diagram of the structure of the limiting unit of the present invention;

[0042] In the figure: 1, control box; 2, locking tooth groove; 3, locking gear; 4, special-shaped groove; 5, special-shaped block; 6, special-shaped shaft; 7, linkage square plate; 8, turning handle; 9, locking slot; 10, positioning round rod; 11, first limit plate; 12, positioning spring; 13, meshing shaft; 14, locking rod; 15, first bearing; 16, extrusion spring; 17, first circular plate; 18, second circular plate; 19, linkage circular plate; 20, second bearing; 21, elastic rod; 22, fixed horizontal block; 23, reset spring; 24, slide groove; 25, slide rail; 26, driving helical gear; 27, rotating helical gear wheel; 28, driving threaded shaft; 29, third bearing; 30, driving plate; 31, limiting plate; 32, limiting groove; 33, limiting rod; 34, limiting spring; 35, driving motor; 36, cutting blade; 37, stabilizing rack; 38, linkage gear; 39, linkage shaft; 40, auxiliary base; 41, active bevel gear; 42, driven bevel gear; 43, linkage bevel gear; 44, oblique fixed rod; 45, driving rotating rod; 46, special-shaped block; 47, guide cross bar; 48, control base; 49, sliding block; 50, matching rod; 51, square groove; 52, connecting rod; 53, guide spring spring; 54, driven shaft; 55, driven base; 56, constant rotating block; 57, compound circular plate; 58, constant rotating groove; 59, support seat; 60, I-beam; 61, rectangular plate; 62, rectangular groove; 63, intermittent horizontal plate; 64, brake groove; 65, pulley; 66, slide shaft; 67, moving rack; 68, rotating gear; 69, rotating shaft; 70, auxiliary box; 71, elliptical plate; 72, special-shaped rod; 73, driving spring; 74, L plate; 75, connecting rod; 76, limited shaft; 77, limiting base; 78, first bevel gear; 79, second bevel gear; 80, stable Threaded shaft; 81, fixed plate; 82, control plate; 83, positioning rod; 84, limit circular plate; 85, compression spring; 86, limit block; 87, locking groove; 88, auxiliary rack; 89, auxiliary gear; 90, auxiliary shaft; 91, stable base; 92, first bevel gear; 93, second bevel gear; 94, engaging shaft; 95, linkage base; 96, double-acting gear; 97, constant rack; 98, auxiliary vertical plate; 99, second limit plate; 100, guide rod; 101, third limit plate; 102, tension spring; 103, T plate; 104, anti-movement block; 105, anti-linking slot. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] Embodiment 1, by Figures 1 to 12 The present invention includes a control box 1, a locking tooth groove 2 is provided on the side of the control box 1, the locking tooth groove 2 is matched with a locking gear 3, a special-shaped groove 4 is provided on the side of the locking gear 3 away from the control box 1, the special-shaped groove 4 is fixedly connected to the moving block 5, a special-shaped rotating shaft 6 is fixedly installed on the side of the moving block 5, the special-shaped rotating shaft 6 passes through the linkage square plate 7 and is fixedly connected to the rotating handle 8, and the special-shaped rotating shaft 6 is transmission-connected with the linkage square plate 7; fixing slots 9 are provided on both sides of the linkage square plate 7, and the fixing slots 9 are connected to the control member The linkage square plate 7 is provided with a positioning rod 10, one end of which is fixedly connected to the side of the control box 1, and the other end passes through the linkage square plate 7 and is fixedly connected to the first limit plate 11. A positioning spring 12 is sleeved on the positioning rod 10, one end of which is fixedly connected to the side of the control box 1, and the other end is fixedly connected to the side of the linkage square plate 7; a meshing shaft 13 is fixedly installed on the side of the locking gear 3 close to the control box 1, and the meshing shaft 13 is connected to the meshing tooth unit;

[0045] The meshing gear unit includes a locking rotating rod 14 movably connected to the meshing rotating shaft 13, and the end of the locking rotating rod 14 away from the rotating handle 8 is connected to the first bearing 15, and the first bearing 15 is fixedly connected to the inner side of the control box 1. An extrusion spring 16 is sleeved on the meshing rotating shaft 13, and one end of the extrusion spring 16 is fixedly connected to the side of the first circular plate 17, and the first circular plate 17 is fixedly connected to the outer side wall of the meshing rotating shaft 13. The other end of the extrusion spring 16 is fixedly connected to the second circular plate 18, and the side of the second circular plate 18 away from the first bearing 15 is fixedly connected to the linkage circular plate 19, and the outer side wall of the linkage circular plate 19 is connected to the second bearing 20. The side surfaces of the linkage circular plate 19 and the second bearing 20 are fixedly connected to the inner side surface of the control box 1; elastic rods 21 are symmetrically installed on the side walls of the said carding rotating rod 14, and the elastic rods 21 are fixedly connected to the fixed cross block 22. A return spring 23 is sleeved on the elastic rod 21, and one end of the return spring 23 is fixedly connected to the side wall of the carding rotating rod 14, and the other end is fixedly connected to the bottom surface of the fixed cross block 22. The slide groove 24 provided on the fixed cross block 22 is slidably connected to the slide rail 25 provided on the inner side wall of the meshing rotating shaft 13. A driving bevel gear 26 is fixedly installed on the said carding rotating rod 14, and the driving bevel gear 26 is connected to the driving transmission mechanism;

[0046] When the operator uses the device to adjust the position of the blade, he first pulls the rotating handle 8 outwards, and the rotating handle 8 drives the locking gear 3 to disengage from the locking tooth groove 2 to release its limiting setting, so that the meshing shaft 13 on the locking gear 3 moves within the locking rotating rod 14, so that the distance between the first circular plate 17 and the second circular plate 18 is shortened, so that the extrusion spring 16 is in a compressed state, and then the engaging cross block 22 on the side wall of the locking rotating rod 14 moves within the slide rail 25 on the inner side wall of the engaging rotating shaft 13. When it moves to the slot on the engaging rotating shaft 13, the reset setting of the reset spring 23 and the elastic rod 21 causes the two engaging cross blocks 22 to clamp the slot on the engaging rotating shaft 13, and then the engaging The fixed rotating shaft 13 is engaged with the engaging rotating rod 14. When there is no need to operate the height adjustment, the rotating handle 8 is released, so that the linkage square plate 7 drives the locking gear 3 to reset in the positioning round rod 10, and the positioning spring 12 is reset. At this time, the bevel on the engaging cross block 22 is fitted into the bevel on the slot on the meshing rotating shaft 13, so that the reset spring 23 and the elastic rod 21 are in a compressed state, so that the engaging cross block 22 is no longer engaged with the slot on the meshing rotating shaft 13, thereby releasing the engaging state of the meshing rotating shaft 13 and the engaging rotating rod 14, so that the locking gear 3 is reset to the locking tooth groove 2, thereby avoiding rotation caused by non-human factors, so that the lawn mower can stably maintain the currently adjusted height when mowing the lawn, thereby improving the mowing efficiency.

[0047] The driving force transmission mechanism of this embodiment includes a rotating bevel gear 27 meshingly connected with the driving bevel gear 26, a driving threaded shaft 28 is installed on the rotating bevel gear 27, both ends of the driving threaded shaft 28 are fixedly connected to the third bearing 29, and the side of the third bearing 29 is fixedly connected to the inner top surface and the inner bottom surface of the control box 1; a driving plate 30 is threadedly installed on the driving threaded shaft 28, and a limiting plate 31 is fixedly installed on the side of the driving plate 30, and the limiting plate 31 is connected to the limiting groove 32 provided on the inner side surface of the control box 1, and a limiting rod 33 is installed on the limiting plate 31, and both ends of the limiting rod 33 are fixedly connected to the top surface and the bottom surface of the limiting groove 32, and a limiting spring 34 is sleeved on the limiting rod 33, one end of the limiting spring 34 is connected to the top surface of the limiting groove 32, and the other end is connected to the inner top surface of the limiting plate 31. The top surface is connected; a driving motor 35 is fixedly installed on the top surface of the driving plate 30, and the output end of the driving motor 35 passes through the driving plate 30 and is fixedly connected to the cutting blade 36; a stabilizing rack 37 is fixedly installed on the side of the control box 1; the stabilizing rack 37 is meshedly connected to the linkage gear 38, and a linkage shaft 39 is installed on the linkage gear 38, and the linkage shaft 39 passes through the auxiliary base 40 and is connected to the active bevel gear 41, and the bottom surface of the auxiliary base 40 is fixedly connected to the top surface of the driving plate 30, and the linkage shaft 39 is transmission-connected to the auxiliary base 40; the active bevel gear 41 is meshedly connected to the driven bevel gear 42, and the driven bevel gear 42 is connected to the compound frequency driving component, and the driven bevel gear 42 is meshedly connected to the linkage bevel gear 43, and the linkage bevel gear 43 is connected to the limit unit;

[0048] The operator operates the rotating handle 8, which drives the meshing shaft 13 on the locking gear 3 to rotate, so that the driving bevel gear 26 on the locking rotating rod 14 meshes with the rotating bevel gear 27 to rotate, so that the driving plate 30 on the driving threaded shaft 28 is lifted and lowered, and the limiting plates 31 on both sides are limited in the lifting and lowering movement in the limiting rods 33 provided on the limiting grooves 32, so that the limiting spring 34 is in a compressed state, so that the cutting blade 36 on the driving plate 30 is adjusted to different heights, and by starting the driving motor 35, the output end of the driving motor 35 drives the cutting blade 36 to trim lawns with different height requirements, thereby improving the trimming efficiency.

[0049] The force control member of this embodiment includes an inclined fixed rod 44 connected to the locking slot 9, and a driving rotating rod 45 is fixedly installed on one end of the inclined fixed rod 44 close to the control box 1, and the two ends of the driving rotating rod 45 are transmission-connected to the inner side of the special-shaped block 46, and the bottom surface of the special-shaped block 46 is fixedly connected to the side of the control box 1; a guide cross bar 47 is installed on the special-shaped block 46, and the two ends of the guide cross bar 47 pass through the special-shaped block 46 and are fixedly connected to the side of the control base 48, and the bottom surface of the control base 48 is fixedly connected to the side of the control box 1; a sliding block 49 is slidably installed on the guide cross bar 47, and a distributing rod 50 is installed on the top surface of the sliding block 49, and one end of the distributing rod 50 close to the linkage square plate 7 is movably connected to the connecting rod 52 installed on the square groove 51 on the inclined fixed rod 44; a guide spring 53 is sleeved on the guide cross bar 47, and one end of the guide spring 53 is fixedly connected to the side of the control base 48, and the other end is fixedly connected to the side of the sliding block 49;

[0050] When the rotating handle 8 drives the linkage square plate 7 to move to a certain position, by releasing the inclined fixed rod 44, the inclined fixed rod 44 is hinged and rotated in the special-shaped block 46, and at the same time drives the sliding block 49 to move within the guide cross bar 47, so that the matching rod 50 is hinged and rotated on the connecting rod 52, and at the same time drives the guide spring 53 to reset, so that the cross block on the inclined fixed rod 44 enters the locking slot 9 on the linkage square plate 7, thereby fixing the linkage square plate 7 at the current position, so that the operator can stably rotate when operating the rotating handle 8.

[0051] The compound intermittent driving component of this embodiment includes a driven rotating shaft 54 ​​arranged on the driven bevel gear 42, one end of the driven rotating shaft 54 ​​is transmission-connected to the driven base 55 provided on the top surface of the driving plate 30, and the other end is fixedly connected to the side of the constant rotating block 56, the constant rotating block 56 is connected to the constant rotating groove 58 provided on the compound moving circular plate 57, and a support seat 59 is installed on the outer side wall of the compound moving circular plate 57, and the support seat 59 is fixedly connected to the top surface of the driving plate 30; an I-beam 60 is fixedly installed on the side of the constant rotating block 56 away from the control box 1, and the I-beam 60 is movably connected to the rectangular groove 62 provided on the rectangular plate 61, and intermittent cross plates 63 are installed on both sides of the rectangular plate 61, and brake grooves 64 are provided on the top and bottom surfaces of the intermittent cross plates 63, and pulleys 65 are movably connected to the brake grooves 64, and the pulleys 65 are connected to the compound moving circular plates 57 are connected by a sliding shaft 66; a moving rack 67 is fixedly installed on the side of the intermittent cross plate 63, and the moving rack 67 is meshed with a rotating gear 68, and a rotating shaft 69 is fixedly installed on the rotating gear 68, and both ends of the rotating shaft 69 are connected to the inner side of the auxiliary box 70; an elliptical plate 71 is fixedly installed on the rotating shaft 69, and the elliptical plate 71 cooperates with the special-shaped rod 72, and the special-shaped rod 72 passes through the auxiliary box 70 and is connected to the side of the driving plate 30, and a driving spring 73 is sleeved on the special-shaped rod 72, one end of the driving spring 73 is fixedly connected to the inner side of the auxiliary box 70, and the other end is fixedly connected to the side of the L plate 74, and the side of the L plate 74 is fixedly connected to the inner side of the auxiliary box 70; the two special-shaped rods 72 are commonly connected to a connecting rod 75, and the connecting rod 75 is connected to the anti-defense mechanism;

[0052] When the driving plate 30 is lifted or lowered, the linkage gear 38 meshing with the stable rack 37 rotates, and then drives the active bevel gear 41 on the linkage shaft 39 to mesh with the driven bevel gear 42 to rotate, so that the driven shaft 54 ​​drives the I-beam 60 on the constant rotating block 56 to rotate, and the constant rotating block 56 rotates stably in the constant rotating groove 58. When the I-beam 60 rotates, it drives the intermittent cross plate 63 to move back and forth left and right in the brake groove 64 through the pulley 65, so that the moving rack 67 moves and meshes with the rotating gear 68 to rotate. Since the elliptical plates 71 on both sides of the driving plate 30 are in a vertically flipped state, the two elliptical plates 71 are on the rotating shaft 69. The shaped rod 72 is contacted synchronously and uninterruptedly; when the elliptical plate 71 contacts the shaped rod 72, the shaped rod 72 moves outward, so that the driving spring 73 is in a compressed state, and at the same time, the other end of the shaped rod 72 no longer contacts the side of the driving plate 30. When the elliptical plate 71 no longer contacts the shaped rod 72, the driving spring 73 is reset, so that the two shaped rods 72 touch the side of the driving plate 30 at the same time, so that the side of the driving plate 30 is in a state of high-frequency micro-vibration, so that the grass leaf fragments and other debris adhered to the cutting blade 36 on the driving plate 30 fall off and no longer adhere to the cutting blade 36, thereby improving the efficiency of mowing the lawn.

[0053] The limiting unit of this embodiment includes a limiting rotating shaft 76 arranged on the linkage bevel gear 43, the limiting rotating shaft 76 passes through the limiting base 77 arranged on the top surface of the driving plate 30 and is connected with the first bevel gear 78, the first bevel gear 78 is meshed and connected with two second bevel gears 79, and a stabilizing threaded shaft 80 is installed on the second bevel gear 79, and the end of the stabilizing threaded shaft 80 away from the control box 1 is transmission-connected to the side of the fixing plate 81, and the side of the fixing plate 81 is fixedly connected to the side of the limiting base 77; the stabilizing threaded shaft 80 is connected to the side of the fixing plate 81, and the side of the fixing plate 81 is fixedly connected to the side of the limiting base 77; A control plate 82 is threadedly mounted on the fixed threaded shaft 80, and a positioning rod 83 is mounted on the control plate 82. The positioning rod 83 passes through the fixed plate 81 and is fixedly connected to the side of the limit circular plate 84; a compression spring 85 is sleeved on the positioning rod 83, and one end of the compression spring 85 is fixedly connected to the side of the fixed plate 81, and the other end is fixedly connected to the side of the limit circular plate 84; a limit block 86 is mounted on the top surface of the control plate 82, and the limit block 86 is matched and connected with a lock groove 87 provided on the side of the control box 1;

[0054] When the driven bevel gear 42 rotates, the meshing linkage bevel gear 43 rotates, so that the first bevel gear 78 on the limit rotating shaft 76 meshes with the two second bevel gears 79 to rotate, and then the stabilizing threaded shaft 80 rotates. The threads on the two stabilizing threaded shafts 80 are opposite, so that when the driving plate 30 rises, the control plate 82 on the end close to the rotating handle 8 moves toward the control box 1, and the control plate 82 on the end close to the cutting blade 36 moves in the direction away from the control box 1. Both control plates 82 are limited by the positioning rod 83, so that one compression spring 85 is in a compressed state and the other is in a stretched state. When the driving plate 30 rises to the maximum position, the limit block 86 moving in the direction close to the control box 1 enters the lock groove 87 to limit it, so that the cutting blade 36 is more stable during trimming after being adjusted to the highest or lowest point.

[0055] The anti-lock mechanism of this embodiment includes an auxiliary rack 88 arranged on the side wall of the connecting rod 75, the auxiliary rack 88 is meshed and connected to the auxiliary gear 89, and an auxiliary rotating shaft 90 is fixedly installed on the side of the auxiliary gear 89, and the auxiliary rotating shaft 90 passes through the stable base 91 and is connected to the first bevel gear 92, and the top surface of the stable base 91 is fixedly connected to the bottom surface of the auxiliary box 70; the first bevel gear 92 is meshed and connected to the second bevel gear 93, and an engaging rotating shaft 94 is fixedly installed on the second bevel gear 93, one end of the engaging rotating shaft 94 is connected to the linkage base 95, the side of the linkage base 95 is fixedly connected to the side of the stable base 91, and the other end is connected to the double-acting gear 96, and the double-acting gear 96 is meshed and connected to two constant racks 97; the two ends of the constant rack 97 pass through the auxiliary vertical plate 98 and are fixedly connected to the side of the second limit plate 99, and the side of the auxiliary vertical plate 98 is fixedly connected to the side of the auxiliary box 70; a guide rod 100 is installed on the auxiliary vertical plate 98, one end of the guide rod 100 is fixedly connected to the side of the auxiliary vertical plate 98, and the other end is fixedly connected to the side of the third limit plate 101, and a tension spring 102 is sleeved on the guide rod 100, and the two ends of the tension spring 102 are fixedly connected to the side of the auxiliary vertical plate 98; a T-plate 103 is fixedly installed on the top surface of the second limit plate 99, and an anti-movement block 104 is installed on the side of the T-plate 103, and the anti-movement block 104 is connected with the anti-linking slot 105 provided on the side of the auxiliary box 70;

[0056] When the special-shaped rod 72 moves outward, the commonly connected connecting rod 75 drives the auxiliary rack 88 to move, and the meshing auxiliary gear 89 rotates, so that the first bevel gear 92 on the auxiliary rotating shaft 90 meshes with the second bevel gear 93 to rotate, and the double-acting gear 96 on the engaging rotating shaft 94 meshes with the two constant racks 97, so that the two constant racks 97 move stably through the guide rod 100, so that the tension spring 102 is in a compressed state, and at the same time, the two anti-movement blocks 104 move relative to each other, and cooperate with the anti-coupling slot 105 on the side of the auxiliary box 70 to be connected, so that the special-shaped rod 72 is limited when it moves outward to the maximum distance and is still moving, thereby improving the safety of the intermittent frequency motion component during movement.

[0057] The present invention also provides a method for using a blade for a lawn mower, comprising the following steps:

[0058] Step 1: Pull the rotating handle 8 outward to drive the locking gear 3 to disengage from the lock tooth groove 2 to release the limiting setting on it, so that the distance between the first circular plate 17 and the second circular plate 18 is shortened, and then the engaging cross block 22 on the side wall of the engaging rotating rod 14 moves in the slide rail 25 on the inner side wall of the engaging rotating shaft 13, and the reset spring 23 and the elastic rod 21 reset so that the two engaging cross blocks 22 are engaged with the slots on the engaging rotating shaft 13;

[0059] Step 2: After the handle 8 is turned to drive the linkage square plate 7 to move to a certain position, the inclined fixed rod 44 is released, and the inclined fixed rod 44 is hinged and rotated in the special-shaped block 46, and at the same time, the sliding block 49 is driven to move within the guide cross bar 47, and the matching rod 50 is hinged and rotated on the connecting rod 52, and at the same time, the guide spring 53 is driven to reset, so that the cross block on the inclined fixed rod 44 enters the locking slot 9 on the linkage square plate 7, and the linkage square plate 7 is fixed at the current position;

[0060] Step 3: By operating the rotating handle 8, the driving bevel gear 26 on the card rotating rod 14 meshes with the rotating bevel gear 27 and rotates, so that the driving plate 30 on the driving threaded shaft 28 is lifted or lowered. When the driving plate 30 is lifted or lowered, the linkage gear 38 meshed with the stable rack 37 rotates, so that the I-beam 60 drives the intermittent cross plate 63 to move back and forth left and right, so that the moving rack 67 moves and meshes with the rotating gear 68 to rotate;

[0061] Step 4: Since the elliptical plates 71 on both sides of the driving plate 30 are in a vertically flipped state, when the elliptical plates 71 contact the special-shaped rods 72, the special-shaped rods 72 move outward, so that the driving springs 73 are in a compressed state, and at the same time, the other ends of the special-shaped rods 72 no longer contact the side of the driving plate 30. When the elliptical plates 71 no longer contact the special-shaped rods 72, the driving springs 73 are reset, so that the two special-shaped rods 72 touch the side of the driving plate 30 at the same time, so that the side of the driving plate 30 is in a high-frequency micro-vibration state, so that the grass leaf fragments and other debris adhered to the cutting blade 36 on the driving plate 30 fall off and no longer adhere to the cutting blade 36;

[0062] Step 5: The cutting blade 36 on the driving plate 30 is adjusted to different heights. By starting the driving motor 35, the output end of the driving motor 35 drives the cutting blade 36 to rotate, so that lawns with different height requirements can be cut.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blade device for a lawn mower, comprising a control box (1), characterized in that: The control box (1) has a locking tooth groove (2) on its side, the locking tooth groove (2) being matched and connected to a locking gear (3), a special-shaped groove (4) being provided on the side of the locking gear (3) away from the control box (1), the special-shaped groove (4) being fixedly connected to a moving block (5), a special-shaped rotating shaft (6) being fixedly mounted on the side of the moving block (5), the special-shaped rotating shaft (6) passing through a linkage square plate (7) and being fixedly connected to a rotating handle (8), the special-shaped rotating shaft (6) being transmission-connected to the linkage square plate (7); locking slots (9) being provided on both sides of the linkage square plate (7), the locking slots (9) being connected to the force control member ; A positioning round rod (10) is installed on the linkage square plate (7), one end of the positioning round rod (10) is fixedly connected to the side of the control box (1), and the other end passes through the linkage square plate (7) and is fixedly connected to the first limit plate (11); a positioning spring (12) is sleeved on the positioning round rod (10), one end of the positioning spring (12) is fixedly connected to the side of the control box (1), and the other end is fixedly connected to the side of the linkage square plate (7); a meshing shaft (13) is fixedly installed on the side of the locking gear (3) close to the control box (1), and the meshing shaft (13) is connected to the meshing tooth unit; The meshing latch unit comprises a locking rotating rod (14) movably connected to the meshing rotating shaft (13); one end of the locking rotating rod (14) away from the rotating handle (8) is connected to the first bearing (15); the first bearing (15) is fixedly connected to the inner side surface of the control box (1); a pressing spring (16) is sleeved on the meshing rotating shaft (13); one end of the pressing spring (16) is fixedly connected to the side surface of the first circular plate (17); the first circular plate (17) is fixedly connected to the outer side wall of the meshing rotating shaft (13); the other end of the pressing spring (16) is fixedly connected to the second circular plate (18); the side of the second circular plate (18) away from the first bearing (15) is fixedly connected to the linkage circular plate (19); the outer side wall of the linkage circular plate (19) is connected to the second bearing (20). The side surfaces of the linkage circular plate (19) and the second bearing (20) are fixedly connected to the inner side surface of the control box (1); elastic rods (21) are symmetrically mounted on the side walls of the locking rotating rod (14); the elastic rods (21) are fixedly connected to the engaging cross block (22); a return spring (23) is sleeved on the elastic rod (21); one end of the return spring (23) is fixedly connected to the side wall of the locking rotating rod (14); the other end is fixedly connected to the bottom surface of the engaging cross block (22); a slide groove (24) provided on the engaging cross block (22) is slidably connected to a slide rail (25) provided on the inner side wall of the meshing rotating shaft (13); a driving bevel gear (26) is fixedly mounted on the locking rotating rod (14); and the driving bevel gear (26) is connected to the driving transmission mechanism; The driving force transmission mechanism comprises a rotating bevel gear (27) meshingly connected with the driving bevel gear (26); a driving threaded shaft (28) is mounted on the rotating bevel gear (27); both ends of the driving threaded shaft (28) are fixedly connected to a third bearing (29); the side surface of the third bearing (29) is fixedly connected to the inner top surface and the inner bottom surface of the control box (1); a driving plate (30) is threadedly mounted on the driving threaded shaft (28); a limiting plate (31) is fixedly mounted on the side surface of the driving plate (30); the limiting plate (31) is connected to a limiting groove (32) provided on the inner side surface of the control box (1); A limiting rod (33) is mounted on the positioning plate (31), the two ends of the limiting rod (33) being fixedly connected to the top surface and the bottom surface of the limiting groove (32), a limiting spring (34) being sleeved on the limiting rod (33), one end of the limiting spring (34) being connected to the top surface of the limiting groove (32), and the other end being connected to the top surface of the limiting plate (31); a driving motor (35) is fixedly mounted on the top surface of the driving plate (30), the output end of the driving motor (35) passing through the driving plate (30) and fixedly connected to the cutting blade (36); and a stabilizing rack (37) is fixedly mounted on the side surface of the control box (1).

2. A blade device for a lawn mower according to claim 1, characterized in that: The stabilizing rack (37) is meshedly connected to a linkage gear (38), a linkage shaft (39) is mounted on the linkage gear (38), the linkage shaft (39) passes through the auxiliary base (40) and is connected to the driving bevel gear (41), the bottom surface of the auxiliary base (40) is fixedly connected to the top surface of the driving plate (30), and the linkage shaft (39) is transmission-connected to the auxiliary base (40); the driving bevel gear (41) is meshedly connected to a driven bevel gear (42), the driven bevel gear (42) is connected to the compound intermittent frequency drive component, the driven bevel gear (42) is meshedly connected to a linkage bevel gear (43), and the linkage bevel gear (43) is connected to the limit unit.

3. A blade device for a lawn mower according to claim 1, characterized in that: The force control member comprises an inclined fixed rod (44) connected to the locking slot (9); a driving rotating rod (45) is fixedly mounted on one end of the inclined fixed rod (44) close to the control box (1); two ends of the driving rotating rod (45) are transmission-connected to the inner side surface of the special-shaped block (46); the bottom surface of the special-shaped block (46) is fixedly connected to the side surface of the control box (1); a guide cross bar (47) is mounted on the special-shaped block (46); two ends of the guide cross bar (47) pass through the special-shaped block (46) and are fixedly connected to the side surface of the control base (48); the control base (48) The bottom surface of the guide cross bar (47) is fixedly connected to the side surface of the control box (1); a sliding block (49) is slidably mounted on the guide cross bar (47); a displacing rod (50) is mounted on the top surface of the sliding block (49); one end of the displacing rod (50) close to the linkage square plate (7) is movably connected to a connecting rod (52) mounted on a square groove (51) on the oblique fixed rod (44); a guide spring (53) is sleeved on the guide cross bar (47); one end of the guide spring (53) is fixedly connected to the side surface of the control base (48), and the other end is fixedly connected to the side surface of the sliding block (49).

4. A blade device for a lawn mower according to claim 2, characterized in that: The compound intermittent frequency drive component comprises a driven rotating shaft (54) arranged on the driven bevel gear (42), one end of the driven rotating shaft (54) is drivingly connected to a driven base (55) provided on the top surface of the driving plate (30), and the other end is fixedly connected to the side of a constant rotating block (56), the constant rotating block (56) is connected to a constant rotating groove (58) provided on the compound moving circular plate (57), a support seat (59) is installed on the outer side wall of the compound moving circular plate (57), and the support seat (59) is fixedly connected to the top surface of the driving plate (30). The constant rotating block (56) is fixedly mounted on a side away from the control box (1) with an I-shaped rod (60), the I-shaped rod (60) being movably connected to a rectangular groove (62) provided on the rectangular plate (61), and intermittent transverse plates (63) being mounted on both sides of the rectangular plate (61), the top and bottom surfaces of the intermittent transverse plates (63) being provided with brake grooves (64), the brake grooves (64) being movably connected to a pulley (65), and the pulley (65) being transmission-connected to the reciprocating circular plate (57) via a slide shaft (66).

5. A blade device for a lawn mower according to claim 4, characterized in that: A movable rack (67) is fixedly mounted on the side of the intermittent horizontal plate (63), the movable rack (67) meshingly connected to a rotating gear (68), a rotating shaft (69) is fixedly mounted on the rotating gear (68), and both ends of the rotating shaft (69) are transmission-connected to the inner side of the auxiliary box (70); an elliptical plate (71) is fixedly mounted on the rotating shaft (69), the elliptical plate (71) cooperates with a special-shaped rod (72), the special-shaped rod (72) passes through the auxiliary box (70) and is connected to the side of the driving plate (30), a driving spring (73) is sleeved on the special-shaped rod (72), one end of the driving spring (73) is fixedly connected to the inner side of the auxiliary box (70), and the other end is fixedly connected to the side of the L plate (74), and the side of the L plate (74) is fixedly connected to the inner side of the auxiliary box (70); the two special-shaped rods (72) are commonly connected to a connecting rod (75), and the connecting rod (75) is connected to the defense mechanism.

6. A blade device for a lawn mower according to claim 2, characterized in that: The limiting unit comprises a limiting rotating shaft (76) arranged on the linkage bevel gear (43), the limiting rotating shaft (76) passes through a limiting base (77) arranged on the top surface of the driving plate (30) and is connected to a first bevel gear (78), the first bevel gear (78) is meshingly connected to two second bevel gears (79), a stabilizing threaded shaft (80) is mounted on the second bevel gears (79), one end of the stabilizing threaded shaft (80) away from the control box (1) is transmission-connected to a side surface of a fixing plate (81), and the side surface of the fixing plate (81) is fixedly connected to a side surface of the limiting base (77); the stabilizing threaded shaft A control plate (82) is threadedly mounted on (80), and a positioning rod (83) is mounted on the control plate (82), and the positioning rod (83) passes through the fixed plate (81) and is fixedly connected to the side of the limit circular plate (84); a compression spring (85) is sleeved on the positioning rod (83), and one end of the compression spring (85) is fixedly connected to the side of the fixed plate (81), and the other end is fixedly connected to the side of the limit circular plate (84); a limit block (86) is mounted on the top surface of the control plate (82), and the limit block (86) is matched and connected with a lock groove (87) provided on the side of the control box (1).

7. A blade device for a lawn mower according to claim 5, characterized in that: The anti-lock mechanism comprises an auxiliary rack (88) arranged on the side wall of the connecting rod (75), the auxiliary rack (88) is meshedly connected to the auxiliary gear (89), an auxiliary rotating shaft (90) is fixedly installed on the side of the auxiliary gear (89), the auxiliary rotating shaft (90) passes through the stable base (91) and is connected to the first bevel gear (92), and the top surface of the stable base (91) is fixedly connected to the bottom surface of the auxiliary box (70); the first bevel gear (92) is meshedly connected to the second bevel gear (93), and the second bevel gear (93) is fixedly installed with an engaging rotating shaft (94), one end of the engaging rotating shaft (94) is connected to the linkage base (95), the side of the linkage base (95) is fixedly connected to the side of the stable base (91), and the other end is connected to the double-acting gear (96), and the double-acting gear (96) is meshedly connected to two constant racks (97).

8. A blade device for a lawn mower according to claim 7, characterized in that: The two ends of the constant rack (97) pass through the auxiliary vertical plate (98) and are fixedly connected to the side of the second limiting plate (99), and the side of the auxiliary vertical plate (98) is fixedly connected to the side of the auxiliary box (70); a guide rod (100) is installed on the auxiliary vertical plate (98), one end of the guide rod (100) is fixedly connected to the side of the auxiliary vertical plate (98), and the other end is fixedly connected to the side of the third limiting plate (101); a tension spring (102) is sleeved on the guide rod (100), and the two ends of the tension spring (102) are fixedly connected to the side of the auxiliary vertical plate (98); a T-plate (103) is fixedly installed on the top surface of the second limiting plate (99), and an anti-movement block (104) is installed on the side of the T-plate (103), and the anti-movement block (104) is matched and connected with an anti-linking slot (105) provided on the side of the auxiliary box (70).

9. A method for using a blade for a lawn mower, comprising the blade device for a lawn mower according to any one of claims 1 to 8, characterized in that: Includes steps: Step 1: Pull the rotating handle (8) outward to drive the locking gear (3) to disengage from the locking tooth groove (2) to release the limiting setting, so that the distance between the first circular plate (17) and the second circular plate (18) is shortened, and then the engaging cross block (22) on the side wall of the engaging rotating rod (14) moves in the slide rail (25) on the inner side wall of the engaging rotating shaft (13), and the reset spring (23) and the elastic rod (21) reset so that the two engaging cross blocks (22) are engaged with the slots on the engaging rotating shaft (13); Step 2: After the handle (8) is turned to drive the linkage square plate (7) to move to a certain position, the inclined fixed rod (44) is released, and the inclined fixed rod (44) is hinged and rotated in the special-shaped block (46), and at the same time, the sliding block (49) is driven to move within the guide cross bar (47). The matching rod (50) is hinged and rotated on the connecting rod (52), and at the same time, the guide spring (53) is driven to reset, so that the cross block on the inclined fixed rod (44) enters the locking slot (9) on the linkage square plate (7), and the linkage square plate (7) is fixed at the current position; Step 3, by operating the rotating handle (8), the driving bevel gear (26) on the card rotating rod (14) meshes with the rotating bevel gear (27) and rotates, so that the driving plate (30) on the driving threaded shaft (28) is raised or lowered. When the driving plate (30) is raised or lowered, the linkage gear (38) meshed with the stabilizing rack (37) rotates, so that the I-beam (60) drives the intermittent cross plate (63) to move back and forth left and right, so that the moving rack (67) moves and meshes with the rotating gear (68) and rotates; Step 4: Since the elliptical plates (71) on both sides of the driving plate (30) are in a vertically flipped state, when the elliptical plates (71) contact the special-shaped rods (72), the special-shaped rods (72) move outward, so that the driving spring (73) is in a compressed state, and at the same time, the other end of the special-shaped rod (72) no longer contacts the side of the driving plate (30). When the elliptical plates (71) no longer contact the special-shaped rods (72), the driving spring (73) is reset, so that the two special-shaped rods (72) touch the side of the driving plate (30) at the same time, so that the side of the driving plate (30) is in a high-frequency micro-vibration state, so that the grass leaf fragments adhered to the cutting blade (36) on the driving plate (30) fall off and no longer adhere to the cutting blade (36); Step 5: The cutting blade (36) on the driving plate (30) is adjusted to different heights. By starting the driving motor (35), the output end of the driving motor (35) drives the cutting blade (36) to rotate, so that lawns with different height requirements can be cut.

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