CN211630860U - Heavy bush-cutting mower - Google Patents

Abstract

The utility model discloses a heavy bush-cutting mower, which relates to the technical field of mowers and comprises a frame, wherein a traction assembly, a gasoline engine and a driving cutter head are connected on the frame, a cutter is connected at the shaft center of the driving cutter head, one side of the traction assembly, which is far away from the frame, is connected with a tractor, the gasoline engine is positioned on the upper surface of the frame, the cutter is positioned on the lower surface of the frame and runs through the wall thickness of the frame, and the gasoline engine is connected with the driving cutter head through a belt transmission; the machine frame is symmetrically connected with lifting adjusting components, one ends, far away from the machine frame, of the lifting adjusting components are connected with land wheels, and the land wheels are located on two sides of the machine frame and are arranged in parallel. The utility model discloses have and to adjust both sides land wheel position according to slope angle for frame and cutterbar remain balanced all the time when marcing on slope, thereby can effectively weed the effect of removing the bush.

Description

Heavy bush-cutting mower

Technical Field

The utility model belongs to the technical field of the lawn mower technique and specifically relates to a heavy bush-cutting lawn mower that cuts is related to.

Background

At present, the mower is also called as a weeder, a lawnmower, a lawn trimmer and the like. The mower is a mechanical tool for trimming lawn and vegetation, and is composed of cutter head, engine, walking wheels, walking mechanism, blades, handrail and control unit. The cutter head is arranged on the travelling wheel, the engine is arranged on the cutter head, the blade is arranged on the output shaft of the engine, the blade is greatly improved in speed by utilizing the high-speed rotation of the engine, the operation time of weeding workers is saved, and a large amount of manpower resources are reduced.

Chinese patent No. CN205755540U discloses a traction reciprocating mower, which comprises a frame, a tractor suspension assembly, a universal joint transmission shaft, a lifting hydraulic cylinder, a cutter, two ground wheels, a lifting shaft, a traction beam, an eccentric wheel, a lower transmission belt pulley and a main transmission belt pulley assembly. Wherein: the frame is connected with the tractor suspension assembly through a traction beam; the universal joint transmission shaft is arranged between the frame and the tractor suspension assembly; the lifting hydraulic oil cylinder, the eccentric wheel, the lower transmission belt pulley and the main transmission belt pulley are assembled on the frame, and the eccentric wheel is connected with the lower transmission belt pulley; the two land wheels are respectively arranged on two sides of the frame; the lifting shaft is arranged on the frame, and one end of the lifting shaft is connected with the lifting hydraulic oil cylinder.

The above prior art solutions have the following drawbacks: the tractor pulls the frame and makes the lawn mower be pulled and advance, when the cutting machine meets the occasion that the slope is great, because both sides land wheel rigidity, when the land wheel was marchd on the slope, easily make frame and cutterbar all wholly slope to can not effectively weed and remove the bush.

SUMMERY OF THE UTILITY MODEL

According to the not enough of prior art existence, the utility model aims at providing a heavy bush-cutting lawn mower has and can adjust both sides land wheel position according to slope angle for frame and cutterbar remain balanced all the time when marcing on slope, thereby can effectively weed the effect of removing the bush.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a heavy bush-cutting mower comprises a frame, wherein a traction assembly, a gasoline engine and a driving cutter head are connected to the frame, a cutter is connected to the axis of the driving cutter head, one side, far away from the frame, of the traction assembly is connected with a tractor, the gasoline engine is located on the upper surface of the frame, the cutter is located on the lower surface of the frame and penetrates through the wall thickness of the frame, and the gasoline engine is in transmission connection with the driving cutter head through a belt; the automatic lifting device is characterized in that lifting adjusting assemblies are symmetrically connected to the rack, one ends, far away from the rack, of the lifting adjusting assemblies are connected with land wheels, and the land wheels are located on two sides of the rack and are arranged in parallel.

Through adopting above-mentioned technical scheme, the gasoline engine drives the initiative blade disc and rotates, and the initiative blade disc makes the cutterbar rotatory and can weed and remove the bush, and the lift adjustment subassembly can be used for according to slope angle lifting or reducing the height of the land wheel of arbitrary one side for can be as far as possible parallel with the slope when the frame is marchd along its advancing direction, thereby be convenient for the cutterbar effectively to weed and remove the bush.

The present invention may be further configured in a preferred embodiment as: the lifting adjusting assembly comprises a first threaded rod, a threaded sleeve, a second threaded rod, a hinge rod, a rotating rod, a connecting rod and a supporting rod which are sequentially arranged, wherein one end of the first threaded rod is hinged with the rack, and the other end of the first threaded rod is in threaded connection with the inner wall of the threaded sleeve; one end of the second threaded rod is in threaded connection with the inner wall of the threaded sleeve, the other end of the second threaded rod is fixedly connected with the hinge rod, and the thread directions of the first threaded rod and the second threaded rod are opposite; the hinge bar is kept away from the one end of second threaded rod with dwang circumference lateral wall fixed connection, the dwang with land wheel axis direction is parallel, just dwang one end with the frame is rotated and is connected, the other end with connecting rod fixed connection, the connecting rod is kept away from the one end and the bracing piece fixed connection of dwang, the bracing piece is located land wheel axle center department, just the land wheel with the bracing piece rotates and connects.

Through adopting above-mentioned technical scheme, rotate threaded sleeve and can make first threaded rod and second threaded rod antiport and stretch out threaded sleeve to make the hinge bar to be promoted to rotate along the dwang axle center, the dwang rotates and makes the connecting rod rotate thereupon, and then makes land wheel produce the displacement, reaches the effect of lift adjustment land wheel vertical position.

The present invention may be further configured in a preferred embodiment as: and a fixing rod is fixedly inserted into the threaded sleeve through the radial wall thickness of the threaded sleeve.

Through adopting above-mentioned technical scheme, supplementary atress when the dead lever is used for rotating the threaded sleeve pipe to the threaded sleeve pipe of being convenient for rotates.

The present invention may be further configured in a preferred embodiment as: still rotate in the frame and be connected with a plurality of driven cutter heads, driven cutter head is located the frame upper surface, follow cutter head axle center department and also connect the cutterbar, the initiative cutter head with also be connected through belt drive between the driven cutter head.

Through adopting above-mentioned technical scheme, driven blade disc passes through the belt and drives blade disc relative rotation, can promote the efficiency that the trees of removing the water of irritating were weeded through the quantity that increases driven blade disc and cutterbar.

The present invention may be further configured in a preferred embodiment as: the upper surface of the rack is rotatably connected with a rotating plate, one end of the rotating plate, which is far away from the connecting part of the rack, is rotatably connected with a tensioning wheel, and the tensioning wheel is positioned on one side of the belt between the driving cutter head and the driven cutter head and is attached to the belt; a vertically arranged positioning rod is arranged on the machine frame in the tensioning direction towards the tensioning wheel, the top end of the positioning rod is connected with an extension spring, and one end, far away from the positioning rod, of the extension spring is connected with the rotating plate.

Through adopting above-mentioned technical scheme, the take-up pulley is used for tensioning the belt to increase the relative pivoted stability of driven blade disc, extension spring can rotate towards tensioning direction one side pulling through the tensile force, and can be according to extension spring's tensile force and the tensioning degree of belt, extension spring can the automatically regulated take-up pulley and the tensioning between the belt.

The present invention may be further configured in a preferred embodiment as: be equipped with the symmetry in the frame and set up and be the support that slides of falling L type, at least one waist type groove has been seted up along its axial in the support top of sliding, be connected with first fixed plate on the support that slides, the gasoline engine bottom with the support that slides passes through locking bolted connection, and locking bolt runs through first fixed plate wall thickness setting and is located waist type groove department, the support that slides is along its axial one end fixedly connected with second fixed plate, first fixed plate orientation second fixed plate one end fixedly connected with locking screw, locking screw runs through the second fixed plate sets up, locking screw keeps away from the one end threaded connection of first fixed plate has lock nut.

By adopting the technical scheme, the locking nut is loosened to pull or push the locking screw, and the locking bolt can slide along the extension direction of the waist-shaped groove, so that the tensioning degree of a belt between the output shaft of the gasoline-saving engine and the driving cutter head can be adjusted, and the locking nut can be screwed again to fix the position of the gasoline engine.

The present invention may be further configured in a preferred embodiment as: the traction assembly comprises a traction plate, a traction rod, a traction plate and a ball head connecting piece which are sequentially connected, a plurality of connecting holes are formed in the traction plate and the dividing plate, the connecting holes in the traction plate and the connecting holes in the dividing plate are arranged in an arc shape, one end of the traction rod corresponds to the connecting holes in the dividing plate through locking bolts, a rotating handle is inserted into the other end of the traction rod, and the rotating handle corresponds to the connecting holes in the traction plate.

By adopting the technical scheme, the angle of the traction rod can be adjusted according to the actual terrain, so that the traction rod is correspondingly connected and fixed with different connecting holes on the traction plate and the dividing plate respectively, and the advancing direction of cutting shrubs is changed.

The present invention may be further configured in a preferred embodiment as: the two ends of the frame along the advancing direction of the land wheel are connected with a plurality of grass blocking chains which are evenly distributed and vertically arranged.

Through adopting above-mentioned technical scheme, keep off the splash of grass chain and be used for reducing rubble, saw-dust or grass bits etc. when cutting bush and mowing, can effectively reduce the influence of lawn mower during operation to personnel's safety and equipment safety.

To sum up, the utility model discloses a following at least one useful technological effect:

1. through the arrangement of the lifting adjusting assembly, the positions of the land wheels on two sides can be adjusted according to the angle of the slope, so that the frame and the cutter are always kept balanced when the machine advances on the slope, and the effect of weeding and removing shrubs can be effectively achieved;

2. through the arrangement of the belt, the driven cutter head and the cutter, the effects of improving the weeding and shrub removing efficiency can be achieved;

3. through the setting of extension spring, rotor plate and take-up pulley, can play the tensioning between automatically regulated take-up pulley and the belt to increase driven cutter head relative rotational stability's effect.

Drawings

Fig. 1 is a schematic view of the overall structure of the lawn mower of the present invention.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is an exploded view of the front side of the mower according to the present embodiment.

Fig. 4 is a partially enlarged schematic view of a portion B in fig. 3.

Fig. 5 is an exploded view of the rear side of the mower according to the present embodiment.

Fig. 6 is a partially enlarged schematic view of a portion C in fig. 5.

In the figure, 1, a frame; 11. a gasoline engine; 12. a land wheel; 13. a grass blocking chain; 14. locking the bolt; 15. a machine cover; 2. a traction assembly; 21. a traction plate; 22. a draw bar; 23. a dividing plate; 24. a ball head connecting piece; 25. connecting holes; 26. rotating the handle; 3. a driving cutter head; 31. a cutter; 32. a belt; 4. a driven cutter head; 41. a rotating plate; 42. a tension wheel; 43. positioning a rod; 44. an extension spring; 5. a slipping bracket; 51. a waist-shaped groove; 52. a first fixing plate; 53. locking the screw rod; 54. locking the nut; 55. a second fixing plate; 6. a lift adjustment assembly; 61. a first threaded rod; 62. a threaded bushing; 63. a second threaded rod; 64. a hinged lever; 65. rotating the rod; 66. a connecting rod; 67. a support bar; 68. and (5) fixing the rod.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b):

referring to fig. 1 and 3, the utility model discloses a heavy bush-cutting mower, including frame 1, be connected with on the frame 1 and pull assembly 2, gasoline engine 11, initiative blade disc 3 and a plurality of driven blade disc 4. One end of the traction assembly 2, which is far away from the frame 1, is connected with a tractor (not shown in the figure), an output shaft of the gasoline engine 11 is connected with a driving cutter head 3 through a belt 32, the driving cutter head 3 is relatively and rotatably connected with a plurality of driven cutter heads 4 through another belt 32, the axes of the driving cutter head 3 and the driven cutter heads 4 are rotatably connected with cutters 31, and the cutters 31 penetrate through the wall thickness of the frame 1 and enable the cutting ends of the cutters 31 to be positioned below the frame 1. The symmetric connection has lift adjustment subassembly 6 in frame 1, and frame 1 is equipped with the land wheel 12 that is parallel to each other along its direction of travel's both sides, and lift adjustment subassembly 6 keeps away from frame 1's one end and is connected with 12 axle centers of land wheel, and land wheel 12 adopts heavy meadow child in this embodiment. In order to prevent broken stones from splashing out during weeding of the shrub, a plurality of grass blocking chains 13 which are uniformly distributed and vertically arranged are connected to the two ends of the frame 1 along the advancing direction of the land wheel 12.

Referring to fig. 1, the traction assembly 2 includes a ball head connector 24, an index plate 23, a traction rod 22 and a traction plate 21 which are connected in sequence, the ball head connector 24 is connected with a ball head of a traction end (not shown in the figure) of the tractor, so that the machine frame 1 can adjust the traveling direction of the tractor at any time. The side wall of one end of the traction rod 22 facing the traction plate 21 is rotatably connected with the two through a locking bolt 14; the dividing plate 23 and the traction plate 21 are both provided with a plurality of connecting holes 25 which are arranged in an arc shape, and the radian directions are consistent; one end of the traction rod 22 is connected with the connecting hole 25 on the indexing plate 23 through the locking bolt 14, the other end is inserted with a rotating handle 26, and the rotating handle 26 is inserted with the connecting hole 25 on the traction plate 21. The connecting angle of the tractor and the frame 1 can be adjusted by adjusting the connecting angle of the traction rod 22 according to the gradient of the terrain where the shrubs are to be removed and the weeds are to be removed, so that the frame 1 is prevented from tilting due to terrain reasons such as slopes when the tractor is dragged to travel.

Referring to fig. 1 and 2, further, in order to promote frame 1 and remove the stability that the bush was weeded on the slope, the cutterbar 31 of being convenient for was parallel with the slope and removed the bush and weed, the utility model discloses in adjust the height of both sides land wheel 12 through lift adjustment subassembly 6, heighten or will reduce one side land wheel 12 height to keep frame 1 as far as possible parallel with the slope. The lifting adjusting assembly 6 in this embodiment comprises a first threaded rod 61, a threaded sleeve 62, a second threaded rod 63, a hinge rod 64, a rotating rod 65, a connecting rod 66 and a supporting rod 67, which are sequentially arranged, wherein the supporting rod 67 is located at the axis of the land wheel 12, one end of the supporting rod 67 is rotatably connected with the land wheel 12, and the rotating rod 65 and the supporting rod 67 are arranged in parallel and fixedly connected through the connecting rod 66; one end of the rotating rod 65, which is far away from the connecting rod 66, is rotatably connected with the frame 1, and the hinge rod 64 is fixedly connected with the circumferential side wall of the rotating rod 65; the first threaded rod 61 and the second threaded rod 63 are positioned at two ends of the threaded sleeve 62 and are in threaded connection with the inner wall of the threaded sleeve 62, and the thread directions of the first threaded rod 61 and the second threaded rod 63 are opposite; first threaded rod 61 is articulated with frame 1, second threaded rod 63 is articulated with articulated rod 64 one end, through rotating threaded sleeve 62, can make first threaded rod 61 and second threaded rod 63 stretch out or stretch into threaded sleeve 62 in the reverse direction, the distance between the one end that threaded sleeve 62 was kept away from to first threaded rod 61 and the one end that threaded sleeve 62 was kept away from to second threaded rod 63 becomes long or shortens, thereby make dwang 65 forward or reverse rotation through promoting or pulling articulated rod 64, dwang 65 rotates and makes bracing piece 67 revolve the rotation of dwang 65 axle center, and then make land wheel 12 produce the displacement of direction of height for frame 1. Preferably, in order to facilitate the turning of the threaded sleeve 62 in a time and labor saving manner, a fixing rod 68 is fixedly inserted through the radial wall thickness of the threaded sleeve 62.

Referring to fig. 5 and 6, after the height of the land wheel 12 is adjusted, in order to adjust the tension degree of the belt 32 between the gasoline engine 11 and the driving cutter disc 3, so that the cutter 31 of the driving cutter disc 3 can stably remove shrubs and weed, in this embodiment, the frame 1 is symmetrically provided with the sliding supports 5, the sliding supports 5 are located at the bottom end of the gasoline engine 11, the sliding supports 5 are inverted L-shaped, the bottoms of horizontally arranged side plates of the sliding supports 5 are provided with first fixing plates 52, and the first fixing plates 52 are fixedly connected with the bottom end of the gasoline engine 11 through the locking bolts 14; the side plate horizontally arranged on the sliding support 5 is provided with at least one through waist-shaped groove 51 along the axial direction, and the locking bolt 14 is positioned at the waist-shaped groove 51; the horizontal curb plate that sets up of support 5 that slides is along its axial one end fixedly connected with second fixed plate 55, and first fixed plate 52 is towards second fixed plate 55 one end fixedly connected with locking screw 53, and locking screw 53 runs through the setting of second fixed plate 55, and the one end threaded connection that first fixed plate 52 was kept away from to locking screw 53 has lock nut 54. The locking nut 54 is loosened, and the locking screw 53 is pushed or pulled, so that the locking bolt 14 directionally slides along the length direction of the waist-shaped groove 51, thereby driving the gasoline engine 11 to slide back and forth and tensioning the belt 32 between the gasoline engine 11 and the driving cutter head 3.

Referring to fig. 3 and 4, in order to facilitate automatic adjustment of the tension of the belt 32 between the driving cutter disc 3 and the driven cutter disc 4, thereby improving the stability of the cutter 31 of the driven cutter disc 4 in weeding and weeding, in this embodiment, a tension pulley 42, a rotating plate 41, a positioning rod 43 and an extension spring 44 are arranged on the upper surface of the frame 1 at the belt 32 of the driven cutter disc 4, one end of the rotating plate 41 is rotatably connected with the frame 1, the other end is rotatably connected with the tension pulley 42, the side wall of the tension pulley 42 is tightly attached to the side wall of the belt 32, the positioning rod 43 is arranged towards the tension side of the belt 32, the positioning rod 43 is fixedly connected with the frame 1, both ends of the extension spring 44 are respectively connected with the positioning rod 43 and the rotating plate 41, the rotating plate 41 can be pulled towards the tension side of the belt 32 by the extension force of the extension spring, the tension spring 44 can not pull the rotation plate 41 to rotate any more, so that the tension of the belt 32 can be automatically adjusted by the tension spring 44.

The implementation principle of the above embodiment is as follows: firstly, assembling a frame 1, installing a gasoline engine 11, a driving cutter head 3 and each driven cutter head 4 on the upper surface of the frame 1, installing a cutter 31 at the axle center of the driving cutter head 3 and the driven cutter head 4, and positioning the cutter 31 below the frame 1. Then, the belt 32 is installed, the locking bolt 14 slides in the waist-shaped groove 51 by pushing the first fixing plate 52, so that the distance between the output shaft of the gasoline engine 11 and the driving cutter head 3 is adjusted, the tension of the belt 32 between the output shaft of the gasoline engine 11 and the driving cutter head 3 is adjusted, the output shaft of the gasoline engine 11 stably drives the driving cutter head 3 to rotate through the belt 32, and after the tension of the belt 32 of the gasoline engine 11 is adjusted, the locking nut 54 is locked towards one side of the second fixing plate 55; more cutters 31 are driven to rotate and the mowing efficiency is improved through belts 32 arranged between the driving cutterhead 3 and the driven cutterheads 4; the positioning rod 43 and the rotating plate 41 respectively arranged on two sides of the belt 32 in the thickness direction of the driven cutter head 4 are connected through the extension spring 44, the rotating plate 41 is pulled towards one side of the positioning rod 43 by the extension spring 44, and the tension wheel 42 connected to the positioning rod 43 is tightly attached to the side wall of the belt 32, so that the tension of the belt 32 can be automatically adjusted by the extension spring 44 according to the expansion degree of the belt 32. Then a cover 15 is covered above the driving cutter head 3 and the driven cutter head 4, and the cover 15 is connected with the upper surface of the frame 1.

The various components of the tractor assembly 2 are then assembled and the hitch plate 21 is attached to the top side of the frame 1 at the end remote from the gasoline engine 11, and the ball joint attachment 24 is ball-jointed to the tractor hitch end (not shown). Then the tractor is started or conveyed to the place where the weeding is needed, the relative height between the two land wheels 12 is adjusted by rotating the threaded sleeve 62 according to the terrain position before the weeding, so that the machine frame 1 is parallel to the terrain where the weeding is needed, and the stable and efficient weeding is realized.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a heavy brush-cutting lawn mower, includes frame (1), be connected with on frame (1) and pull assembly (2), gasoline engine (11) and initiative blade disc (3), initiative blade disc (3) axle center department is connected with cutterbar (31), its characterized in that: one side, far away from the rack (1), of the traction assembly (2) is connected with a tractor, the gasoline engine (11) is located on the upper surface of the rack (1), the cutter (31) is located on the lower surface of the rack (1) and penetrates through the wall thickness of the rack (1), and the gasoline engine (11) is in transmission connection with the driving cutter head (3) through a belt (32); the automatic lifting and lowering mechanism is characterized in that lifting and lowering adjusting assemblies (6) are symmetrically connected to the rack (1), one ends, far away from the rack (1), of the lifting and lowering adjusting assemblies (6) are connected with land wheels (12), and the land wheels (12) are located on two sides of the rack (1) and are arranged in parallel.

2. A heavy bush cutter as claimed in claim 1 wherein: the lifting adjusting assembly (6) comprises a first threaded rod (61), a threaded sleeve (62), a second threaded rod (63), a hinge rod (64), a rotating rod (65), a connecting rod (66) and a supporting rod (67) which are sequentially arranged, one end of the first threaded rod (61) is hinged with the rack (1), and the other end of the first threaded rod is in threaded connection with the inner wall of the threaded sleeve (62); one end of the second threaded rod (63) is in threaded connection with the inner wall of the threaded sleeve (62), the other end of the second threaded rod is fixedly connected with the hinged rod (64), and the thread turning directions of the first threaded rod (61) and the second threaded rod (63) are opposite; hinge rod (64) are kept away from the one end of second threaded rod (63) with dwang (65) circumference lateral wall fixed connection, dwang (65) with land wheel (12) axis direction is parallel, just dwang (65) one end with frame (1) rotates to be connected, the other end with connecting rod (66) fixed connection, connecting rod (66) are kept away from the one end and bracing piece (67) fixed connection of dwang (65), bracing piece (67) are located land wheel (12) axle center department, just land wheel (12) with bracing piece (67) rotate to be connected.

3. A heavy bush cutter as claimed in claim 2 wherein: and a fixing rod (68) is fixedly inserted into the threaded sleeve (62) through the radial wall thickness of the threaded sleeve.

4. A heavy bush cutter as claimed in claim 1 wherein: still rotate on frame (1) and be connected with a plurality of driven blade discs (4), driven blade disc (4) are located frame (1) upper surface, driven blade disc (4) axle center department also connects cutterbar (31), initiative blade disc (3) with also connect through belt (32) transmission between driven blade disc (4).

5. A heavy bush cutter as claimed in claim 4 wherein: the upper surface of the rack (1) is rotatably connected with a rotating plate (41), one end, far away from the connecting part of the rack (1), of the rotating plate (41) is rotatably connected with a tension pulley (42), and the tension pulley (42) is positioned on one side of a belt (32) between the driving cutter head (3) and the driven cutter head (4) and is attached to the belt (32); a positioning rod (43) which is vertically arranged is arranged on the machine frame (1) in the tensioning direction towards the tensioning wheel (42), the top end of the positioning rod (43) is connected with an extension spring (44), and one end, far away from the positioning rod (43), of the extension spring (44) is connected with the rotating plate (41).

6. A heavy bush cutter as claimed in claim 1 wherein: the frame (1) is provided with symmetrically arranged and inverted L-shaped sliding brackets (5), the top end of the sliding support (5) is provided with at least one waist-shaped groove (51) along the axial direction, the first fixing plate (52) is connected on the sliding support (5), the bottom end of the gasoline engine (11) is connected with the sliding support (5) through a locking bolt (14), and the locking bolt (14) penetrates through the wall thickness of the first fixing plate (52) and is positioned at the waist-shaped groove (51), one end of the sliding support (5) along the axial direction is fixedly connected with a second fixing plate (55), one end of the first fixing plate (52) facing the second fixing plate (55) is fixedly connected with a locking screw rod (53), the locking screw rod (53) penetrates through the second fixing plate (55), and one end, far away from the first fixing plate (52), of the locking screw rod (53) is connected with a locking nut (54) in a threaded mode.

7. A heavy bush cutter as claimed in claim 1 wherein: traction assembly (2) is including the traction plate (21), traction lever (22), graduated plate (23) and bulb connecting piece (24) that connect gradually, traction plate (21) with a plurality of connecting holes (25) have all been seted up on graduated plate (23), on traction plate (21) connecting hole (25) with on graduated plate (23) connecting hole (25) all are the arc and arrange, traction lever (22) one end is passed through locking bolt (14) and is corresponded on graduated plate (23) connecting hole (25) are connected, traction lever (22) other end is inserted and is equipped with rotatory handle (26), just rotatory handle (26) correspond on traction plate (21) connecting hole (25) are inserted and are established.

8. A heavy bush cutter as claimed in claim 1 wherein: the two ends of the frame (1) along the advancing direction of the land wheel (12) are connected with a plurality of grass blocking chains (13) which are uniformly distributed and vertically arranged.

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