CN212064785U

CN212064785U - Rotary cultivator with prevent disconnected axle structure

Info

Publication number: CN212064785U
Application number: CN202020659650.8U
Authority: CN
Inventors: 高绪新
Original assignee: Hubei Oulande Industrial Co ltd
Current assignee: Hubei Oulande Industrial Co ltd
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2020-12-04
Anticipated expiration: 2030-04-27

Abstract

The utility model relates to a rotary cultivator with prevent disconnected axle structure belongs to agricultural machinery technical field. The rotary cultivator with the shaft breakage prevention function consists of a frame, a suspension bracket, a gearbox, a cutter shaft, rotary blades, a grass prevention rod and a cutter holder; the middle part of the frame is provided with a gear box, and a suspension bracket is arranged above the gear box; the two sides below the gear box are symmetrically provided with cutter shafts; one end of the cutter shaft is connected with the frame through a bearing seat; the other end of the cutter shaft is connected with an output shaft of the gearbox through a flexible connector; a support arm is fixedly arranged on the machine frame above the cutter shaft; the supporting arm is movably connected with the cutter shaft through a shaft sleeve; the circumferential surface of the cutter shaft is spirally provided with a plurality of cutter seats, and the cutter seats are provided with rotary blades through bolts. This rotary cultivator with prevent disconnected axle function has solved the output shaft "easy fracture" of current rotary cultivator gearbox assembly and has connected some wearing and tearing of structure and fast and the short problem of life, has satisfied the needs that people used.

Description

Rotary cultivator with prevent disconnected axle structure

Technical Field

The utility model relates to a rotary cultivator with prevent disconnected axle structure belongs to agricultural machinery technical field.

Background

The rotary cultivator is a common tillage machine for field operation, and has the functions of combining plough and harrow into one, and can break soil and level land by rotary tillage once. The existing rotary cultivator is mostly of an intermediate transmission type structure, if the utility model patent with the publication number of CN206585906U, the disclosed compound rotary cultivator has the gearbox assembly arranged in the center of the whole machine, and the left and right knife roll assemblies are respectively arranged on two sides of the gearbox assembly. The output shaft of the gear box assembly is connected with the cutter shaft of the cutter roller assembly in a hard connection mode through a connecting structure. Because the cutter shaft in the cutter roller assembly of the rotary cultivator is relatively long, and the cutter shaft drives the rotary blade to rotate to carry out the soil crushing operation, the cutter shaft is a main bearing part. When the rotary cultivator is used for soil crushing, the rotary tillage soil has the characteristics of uneven height and different hardness, so that the cutter shaft serving as a main bearing part has the problem of uneven stress. After the cutter shaft is used for a long time, the cutter shaft is easy to bend. In the process that the cutter shaft is bent, the output shaft of the gearbox assembly can be pulled through the connecting structure to deform at the same time. When the deformed output shaft drives the bent cutter shaft to continue to rotate in the working process, the stress of the output shaft of the gearbox assembly is more unbalanced, and the problem of shaft breakage is easily caused. The connection form that current connection structure adopted ordinary spline connection in addition, ordinary spline connection's connection form is applicable to operating mode, the stable mechanical equipment of atress, and when it was used on the rotary cultivator, because the arbor has the uneven problem of atress, and then lead to current connection structure's spline housing and integral key shaft to have wearing and tearing fast and the short problem of life, can not satisfy the needs that people used.

Disclosure of Invention

The utility model aims to provide a: the rotary cultivator with the shaft breaking prevention function is simple in structure, good in practicability and capable of effectively solving the problems that an output shaft of a gearbox assembly is easy to break, a connecting structure is fast in abrasion and short in service life.

The technical scheme of the utility model is that:

a rotary cultivator with a shaft breakage prevention structure comprises a frame, a suspension bracket, a gearbox, a cutter shaft, a rotary blade, a grass prevention rod and a cutter holder; the middle part of the frame is provided with a gear box, and a suspension bracket is arranged above the gear box; the two sides below the gear box are symmetrically provided with cutter shafts; one end of the cutter shaft is connected with the frame through a bearing seat; the method is characterized in that: the other end of the cutter shaft is connected with an output shaft of the gearbox through a flexible connector; a support arm is fixedly arranged on the machine frame above the cutter shaft; the supporting arm is movably connected with the cutter shaft through a shaft sleeve; a plurality of tool holders are spirally arranged on the circumferential surface of the cutter shaft, and rotary blades are arranged on the tool holders through bolts; grass prevention rods are welded on the cutter holders positioned on the same spiral line.

The flexible connector consists of a main connecting disc, an auxiliary connecting disc, a locking nut, a locking sheet, an oil seal gland, a cushion pad and a buffer diaphragm; one end of the cutter shaft is fixedly provided with a main connecting disc through a locking nut; an output shaft of the gearbox on one side of the main connecting disc is fixedly provided with an auxiliary connecting disc through a locking nut and a locking sheet; the main connecting disc and the auxiliary connecting disc are connected in a clamping manner through a cushion pad; and an oil seal is arranged on the gearbox on one side of the auxiliary connecting disc through an oil seal gland.

The main connecting disc is of an integrated structure; the cross section of the utility model is in a convex structure; an assembly counter bore is formed in the end face of the outer end of the main connecting disc; one side of the assembly counter bore is provided with a conical assembly through hole; a plurality of spline grooves are uniformly formed in the inner surface of the assembling through hole; one end of the cutter shaft is in a conical structure; a plurality of spline teeth are uniformly distributed on the conical circumferential surface of the cutter shaft; spline teeth of the cutter shaft are meshed and connected with spline grooves of the main connecting disc; a plurality of clamping teeth are uniformly arranged on the inner wall of the assembly counter bore; one end of the clamping tooth extends to the outer end of the assembly counter bore.

The auxiliary connecting disc is of an integrated structure; the cross section of the utility model is in a convex structure; an assembly counter bore is formed in the end face of the outer end of the auxiliary connecting disc; one side of the assembly counter bore is provided with a conical assembly through hole; a plurality of spline grooves are uniformly formed in the inner surface of the assembling through hole; the output shaft of the gearbox is a conical shaft, a plurality of spline teeth are uniformly distributed on the conical circumferential surface of the output shaft of the gearbox, and the spline teeth are meshed and connected with the spline grooves of the auxiliary connecting disc; a plurality of clamping teeth are uniformly arranged on the inner wall of the assembly counter bore; one end of the clamping tooth extends to the outer end of the assembly counter bore.

The buffer pad is formed by injection molding of a plastic material with elastic characteristic and comprises a support ring and buffer teeth; a plurality of buffer teeth are uniformly distributed on the circumferential surface of the support ring; the buffer teeth are consistent with the clamping teeth of the main connecting disc and the clamping teeth of the auxiliary connecting disc in structure and are mutually connected with the buffer teeth; one side face of the buffer tooth is in fit connection with the clamping tooth of the connecting disc, and the other side face of the buffer tooth is in fit connection with the clamping tooth of the auxiliary connecting disc.

A plurality of buffer diaphragms are arranged between the edges of the main connecting disc and the auxiliary connecting disc; the outer diameter of the buffer membrane is consistent with the outer diameter of the main connecting disc and the outer diameter of the auxiliary connecting disc; the inner wall of the buffer membrane is in fit connection with the outer surfaces of the clamping teeth of the main connecting disc and the clamping teeth of the auxiliary connecting disc.

The whole rotary tillage cutter is of an L-shaped structure; a plurality of locking holes are arranged side by side at the vertical end head of the rotary blade; the rotary blade is fixedly arranged on the blade holder through the locking hole; the section of the rotary blade is of a right-angled triangle structure, and the sharp corner part of the triangular structure of the section of the rotary blade is the blade part of the rotary blade.

The straw-proof rod is spiral, and one end of the straw-proof rod is in contact with the rack.

The bearing seat consists of a bearing seat body, an inner protective cover and an outer protective cover, wherein the outer protective cover is fixedly arranged on one side of the bearing seat body through a bolt, and the inner protective cover is movably arranged on the other side of the bearing seat body; the bearing seat body is a cylinder with a convex section, the middle part of an inner hole of the bearing seat body is provided with a limiting flange, and one side of the limiting flange is sequentially provided with an oil seal mounting position and a bearing mounting position; a sealing ring groove is formed in the bearing seat body on the other side of the limiting flange; and an assembly ring groove is arranged on the outer ring of the sealing ring groove.

A plurality of reinforcing blocks are uniformly distributed in the assembling ring groove; the reinforcing block is provided with fixing holes, and each fixing hole extends into the bearing seat body and penetrates through the bearing seat body; a plurality of assembling holes are uniformly distributed on the end surfaces of the outer protecting cover and the bearing seat body, and the outer protecting cover and the bearing seat body are fixedly connected through the assembling holes by bolts; a plurality of reinforcing ribs are uniformly distributed on the circumferential surface of the bearing seat body, and each reinforcing rib corresponds to the assembling hole; the central part of the outer protecting cover is provided with a concave cavity; the inner shield is of a barrel shape, and a mounting hole is formed in the center of the inner shield.

The utility model has the advantages that:

the rotary cultivator with the shaft breakage prevention function has the advantages of simple structure and ingenious design, and adopts the structural design that the flexible connector is adopted to connect the cutter shaft with the gearbox; after adopting this kind of design, flexible connector during operation can provide certain buffering space and buffer power to make the gearbox can only transmit the moment of torsion to the arbor through flexible connector on, effectively solved when the arbor takes place to bend the uneven output shaft cracked problem that leads to the gearbox of atress. In addition this application has still adopted to set up the support arm in the frame to carry out the structural design of spacing support to the arbor through the support arm, so its risk with the bending of greatly reduced arbor, and then solved the output shaft "easy fracture" of current rotary cultivator gearbox assembly and connected the problem that the wearing and tearing that the structure exists are fast and life is short, satisfied the needs that people used.

Description of the drawings:

fig. 1 is a schematic view of the structure of the present invention;

fig. 2 is a left side view structure diagram of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 4 is an exploded view of the flexible connector of the present invention;

fig. 5 is a schematic view of the main connection pad of the present invention;

fig. 6 is a schematic structural view of a cushion pad of the flexible connector of the present invention;

FIG. 7 is a schematic view of the front view and the cross-sectional structure of the auxiliary connecting disk of the present invention;

fig. 8 is a schematic view of the buffering diaphragm of the flexible connector and its cross-sectional structure;

FIG. 9 is a schematic view of the rotary blade of the present invention;

fig. 10 is a schematic structural view of the bearing seat of the present invention;

fig. 11 is a left side view structural schematic diagram of the bearing seat body of the present invention;

fig. 12 is a right-side structural schematic view of the bearing seat body of the present invention;

fig. 13 is a schematic structural view of a plurality of buffer membranes assembled together according to the present invention.

In the figure: 1. the device comprises a rack, 2, a suspension bracket, 3, a gearbox, 4, a cutter shaft, 5, a rotary blade, 6, a weed prevention rod, 7, a cutter holder, 8, a supporting arm, 9, a main connecting disc, 10, an auxiliary connecting disc, 11, a locking nut, 12, a locking sheet, 13, an oil seal gland, 14, a buffer pad, 15, an oil seal, 16, a buffer membrane, 17, an assembly counter bore, 18, an assembly through hole, 19, a supporting ring, 20, a clamping tooth, 21, a buffer tooth, 22, a bearing seat body, 23, an inner protective cover, 24, an outer protective cover, 25, a limiting flange, 26, an oil seal installation position, 27, a bearing installation position, 28, a sealing ring groove, 29, an assembly ring groove, 30, a reinforcing block, 31, a fixing hole, 32, a locking hole, 33, an assembly hole, 34, a reinforcing rib, 35, a cavity, 36 and an.

Detailed Description

The rotary cultivator with the shaft breakage prevention function is composed of a frame 1, a suspension bracket 2, a gearbox 3, a cutter shaft 4, rotary blades 5, a grass prevention rod 6 and a cutter holder 7 (see the attached figures 1 and 2 in the specification).

A gear box 3 is arranged in the middle of the frame 1, and a suspension bracket 2 is arranged above the gear box 3; a cutter shaft 4 in the shape of a tubular shaft body is symmetrically arranged on two sides below the gear box 3; one end of the cutter shaft 4 is connected with the frame 1 through a bearing seat (see the attached figure 1 of the specification).

The bearing housing is formed of a housing body 22, an inner shroud 23 and an outer shroud 24 (see figures 10, 11 and 12 of the specification).

The bearing seat body 22 is a cylinder with a convex section, a limiting flange 25 (see the attached figure 10 in the specification) is arranged in the middle of an inner hole of the bearing seat body 22, and the diameter of the inner hole of the limiting flange 25 is larger than that of the cutter shaft 4, so that the interference between the limiting flange 25 and the cutter shaft 4 is prevented. Set up spacing flange 25's aim at: the mounting position of the bearing housing body 22 is limited, and the bearing housing body 22 is prevented from deviating from the mounting position when being assembled on the cutter shaft 4.

One side of the limiting flange 25 is sequentially provided with an oil seal mounting position 26 and a bearing mounting position 27; a sealing ring groove 28 is arranged on the bearing seat body 22 on the other side of the limiting flange 25 (see the description attached figures 10 and 12); one side of the sealing ring groove 28 is movably provided with an inner shield 23.

The inner shield 23 is cylindrical, and a mounting hole 36 is formed in the center of the inner shield 23 (see fig. 10 in the specification). During assembly, the circumferential part of the inner shield 23 is in fit connection with the sealing ring groove 28, and the inner shield 23 is welded on the cutter shaft 4 through the mounting hole 36; the inner shield 23 can form a seal with the bearing seat body 22 after being arranged, and can effectively prevent sewage from entering the bearing seat body 22.

The outer ring of the sealing ring groove 28 is provided with a fitting ring groove 29 (see the description attached to fig. 10). Reinforcing blocks 30 are uniformly distributed in the assembling ring groove 29; the reinforcing block 30 is provided with fixing holes 31, and each fixing hole 31 extends into and penetrates the bearing housing body 22 (see fig. 10 and 12 in the specification). The bearing housing body 22 is connected to the frame 1 through the fixing hole 31 by a bolt. The purpose of the assembly ring groove 29 is to: so that the bolt assembled on the fixing hole 31 is positioned in the assembling ring groove 29 to protect the bolt and prevent the accident that weeds wind the bolt when the rotary cultivator works.

An outer protecting cover 24 is arranged on one side of the bearing seat body 22, assembling holes 33 are uniformly distributed on the circumferences of the outer protecting cover 24 and the bearing seat body 22, and the outer protecting cover 24 and the bearing seat body 22 are fixedly connected through the assembling holes 33 by bolts (see the attached

drawings

10 and 11 in the specification).

Reinforcing ribs 34 are uniformly distributed on the circumferential surface of the bearing seat body 22, and the reinforcing ribs 34 respectively correspond to the assembly holes 33 (see the attached figure 11 in the specification). The purpose of providing the reinforcing ribs 34 is: the bearing seat body 22 is used for enhancing the assembling strength of the bearing seat body 22 and preventing the bearing seat body 22 from generating a tension crack phenomenon when the assembling hole 33 is stressed.

The central portion of the outer cover 24 is provided with a cavity 35 (see fig. 10 in the specification). The concave cavity 35 is communicated with the outside through a nozzle; the purpose of the cavity 35 is to: the concave cavity 35 and the inner hole of the bearing seat body 22 form a closed space, so that lubricating oil can be conveniently stored in the closed space to lubricate the bearing.

The other end of the cutter shaft 4 is connected with an output shaft of the gearbox 3 through a flexible connector (see the attached figures 1 and 3 in the specification).

The flexible connector is composed of a main connecting disc 9, a secondary connecting disc 10, a locking nut 11, a locking sheet 12, an oil seal pressing cover 13, a buffer pad 14 and a buffer diaphragm 16 (see the attached figures 3 and 4 in the specification).

One end of the cutter shaft 4 is fixedly provided with a main connecting disc 9 through a locking nut 11 (see the attached figure 3 in the specification). The main connecting disc 9 is of an integrated structure and is made of cast iron materials in a casting mode (see the attached figures 4 and 5 in the specification); the cross section of the utility model is in a convex structure. An assembly counter bore 17 is formed in the end face of the outer end of the main connecting disc 9; one side of the assembly counter bore 17 is provided with an assembly through hole 18 (see the description and the attached figure 5) in a conical shape; a plurality of spline grooves are uniformly formed on the inner surface of the assembling through hole 18; one end of the cutter shaft 4 is in a conical structure; a plurality of spline teeth are uniformly distributed on the conical circumferential surface of the cutter shaft 4; the spline teeth of the cutter shaft 4 are meshed and connected with the spline grooves of the main connecting disc 9.

The purpose of setting the assembly through hole 18 and one end of the cutter shaft 4 to be conical is as follows: firstly, a part of torque is transmitted through the expansion force of the cutter shaft 4, and the transmission load of the spline is reduced. Secondly, the spline teeth 17 on the cutter shaft 4 and the spline grooves on the main connecting disc 9 are completely attached without a fit clearance, so that the impact abrasion of the spline teeth and the spline grooves is reduced; and then solved ordinary spline connection structure and had the problem that wearing and tearing are fast and life is short.

A plurality of clamping teeth 20 are uniformly arranged on the inner wall of the assembly counter bore 17 of the main connecting disc 9; one end of the snap tooth 20 extends to the outer end of the assembly counterbore 17 (see figures 4 and 5 of the specification).

An auxiliary connecting disc 10 is fixedly arranged on an output shaft of the gearbox 3 on one side of the main connecting disc 9 through a locking nut 11 and a locking sheet 12 (see the attached figures 3 and 4 in the specification). During assembly, the locking claws of the locking pieces 12 are clamped into the corresponding clamping grooves of the locking nuts 11, and then the locking nuts 11 are screwed; the locking piece 12 has a function of preventing the lock nut 11 from being loosened. The tightening direction of the locking nut 11 is consistent with the power direction applied to the locking nut 11 by the output shaft of the gearbox 3, and when the locking nut 11 is arranged in this way, the locking nut 11 always has the tightening trend in the rotating process of the output shaft of the gearbox 3, so that the problem that the locking nut 11 is loosened is avoided.

The auxiliary connecting disc 10 is of a one-piece structure and is made of cast iron materials in a casting mode (see the attached figures 3 and 7 in the specification). The cross section of the auxiliary connecting disc 10 is of a convex structure; an assembly counter bore 17 is formed in the end face of the outer end of the auxiliary connecting disc 10; one side of the assembly counter bore 17 is provided with a conical assembly through hole 18; a plurality of spline grooves are uniformly formed on the inner surface of the assembling through hole 18; the output shaft of the gearbox 3 is a conical shaft, a plurality of spline teeth are uniformly distributed on the conical circumferential surface of the output shaft of the gearbox 3, and the spline teeth are meshed and connected with spline grooves of the auxiliary connecting disc 10 (see the attached figures 3 and 7 in the specification).

When in assembly, the output shaft of the gearbox 3 is wedged and connected with the assembly through hole 18 of the auxiliary connecting disc 10; when the lock nut 11 is screwed, the output shaft of the transmission case 3 expands the auxiliary connecting disc 10 from the inside, and the purpose of the arrangement is as follows: firstly, a part of torque is transmitted through the expansion force of the output shaft of the gearbox 3, and the transmission load of the spline is reduced. Secondly, when the output shaft of the gearbox 3 is arranged to be conical, the spline teeth on the output shaft of the gearbox 3 and the spline grooves of the auxiliary connecting disc 10 can be completely attached without fit clearance, so that the impact wear of the spline teeth 17 and the spline grooves is reduced; the problem of ordinary spline connection structure have wearing and tearing fast and life weak point is solved.

A plurality of clamping teeth 20 are uniformly arranged on the inner wall of the assembly counter bore 17 of the auxiliary connecting disc 10; one end of the snap tooth 20 extends to the outer end of the assembly counterbore 17 (see fig. 4 and 7 of the specification).

The main connecting disc 9 and the auxiliary connecting disc 10 are mutually clamped and connected through a cushion pad 14 (see the description and the attached figures 3 and 4). The cushioning pad 14 is injection moulded from a plastics material with resilient properties (see figures 4 and 6 of the specification). The buffer pad 14 consists of a support ring 19 and buffer teeth 21; a plurality of buffer teeth 21 are evenly distributed on the circumferential surface of the support ring 19. The buffer teeth 21 are consistent with the structure of the clamping teeth 20 of the main connecting disc 9 and the clamping teeth 20 of the auxiliary connecting disc 10 (see the description, the attached figures 5, 6 and 7).

After the main connecting disc 9, the auxiliary connecting disc 10 and the buffer pad 14 are assembled, the clamping teeth 20 of the main connecting disc 9 extend into the assembly counter bore 17 of the auxiliary connecting disc 10; the clamping teeth 20 of the auxiliary connecting disc 10 extend to the inner part of the assembly counter bore 17 of the main connecting disc 9 (see the description, the attached figures 3 and 4). The clamping teeth 20 of the main connecting disc 9 and the clamping teeth 20 of the auxiliary connecting disc 10 are mutually connected with the buffer teeth 21 of the buffer pad 14; one side surface of the buffer tooth 21 is in fit connection with the clamping tooth 20 of the connecting disc 9, and the other side surface of the buffer tooth 21 is in fit connection with the clamping tooth 20 of the auxiliary connecting disc 10. The outer surface of the support ring 19 of the cushion pad 14 is in fit connection with the inner side surfaces of the clamping teeth 20 of the main connecting disc 9 and the clamping teeth 20 of the auxiliary connecting disc 10.

After the main connecting disc 9, the auxiliary connecting disc 10 and the buffer pad 14 are assembled; the torque of the output shaft of the gearbox 3 can be transmitted to the cutter shaft 4 through the auxiliary connecting disc 10, the cushion pad 14 and the main connecting disc 9, and then the purpose of driving the cutter shaft 4 to rotate is achieved. In the process, if the cutter shaft 4 is bent and deformed, the main connecting disc 9 of the cutter shaft 4 can extrude the cushion pad 14 through the clamping teeth 20 to deform the cushion pad, so that the problem that the output shaft of the gearbox 3 is driven to deform through the auxiliary connecting disc 10 in the deformation process of the cutter shaft 4 when the main connecting disc 9 is in hard connection with the auxiliary connecting disc 10 is solved, and the risk of breakage of the output shaft of the gearbox 3 is reduced. An oil seal 15 is arranged on the transmission case 3 on the side of the auxiliary connecting disc 10 through an oil seal gland 13 (see the attached figure 3 in the specification).

A plurality of buffer diaphragms 16 are arranged between the edges of the main connecting disc 9 and the auxiliary connecting disc 10 (see the attached figures 3 and 4 in the specification). The buffer diaphragm 16 is made of flexible metal with certain elasticity; the inner side surface of the buffer membrane 16 is in an arc structure; the buffer diaphragm 16 is in fit connection with the outer surfaces of the clamping teeth 20 of the main connecting disc 9 and the clamping teeth 20 of the auxiliary connecting disc 10 through the arc-shaped structures (see the attached figures 3 and 4 in the specification). The purpose of the buffer membrane 16 is to: firstly, after the cutter shaft 4 is bent and deformed, the main connecting disc 9 of the cutter shaft 4 can be deformed by extruding the buffer diaphragm 16, so that a certain buffer space is provided for the deformation of the cutter shaft 4, and the risk of 'fracture' of the output shaft of the gearbox 3 is further reduced. Secondly, the deformation buffering of the buffering diaphragm 16 is utilized to reduce the buffering pressure of the buffering pad 14, thereby achieving the purpose of prolonging the service life of the buffering pad 14.

Therefore, the main connecting disc 9 and the auxiliary connecting disc 10 can always keep a certain strain gap under the separation action of the cushion pad 14 and the cushion diaphragm 16 (namely, the main connecting disc 9 and the auxiliary connecting disc 10 are not in direct contact and are always in an isolated state); the strain gap is formed under the compression action of the buffer cushion 14 and the buffer diaphragm 16, so that when the cutter shaft 4 is bent and deformed and the main connecting disc 9 is eccentrically displaced, the main connecting disc 9 only can press the buffer cushion 14 and the buffer diaphragm 16 to deform; the auxiliary connecting disc 10 cannot collide with the auxiliary connecting disc 10 to deform the auxiliary connecting disc 10 and the output shaft of the gearbox 3, so that the auxiliary connecting disc 10 and the output shaft of the gearbox 3 are always in a concentric state, the problem that the auxiliary connecting disc 10 deforms along with the main connecting disc 9 when the main connecting disc 9 and the auxiliary connecting disc 10 are in hard connection is solved, and the risk of breakage of the output shaft of the gearbox 3 is reduced.

The outer diameter of the buffer membrane 16 is consistent with the outer diameter of the main connecting disc 9 and the outer diameter of the auxiliary connecting disc 10; the end surfaces of the two ends of the buffer membrane 16 are both in a convex structure (see the attached figure 8 in the specification); the purpose of so setting is: after the buffer diaphragms 16 are assembled on the main connecting disc 9 and the auxiliary connecting disc 10, the convex parts between the buffer diaphragms 16 are mutually interfered, and certain gaps exist between the outer edge parts and the inner edge parts between the buffer diaphragms 16 (see the attached figure 13 in the specification). The purpose of this arrangement of the damping diaphragm 16 is: firstly, the buffer membrane 16 has better elastic performance through a convex structure; secondly, when the buffer diaphragms 16 are pressed against each other, the convex structures between the buffer diaphragms 16 need to be pressed flat, and then the buffer diaphragms can be attached to each other, and therefore, when the buffer diaphragms are in a flat cushion state, a larger buffer space can be provided.

A support arm 8 (see the attached figure 1 of the specification) is fixedly arranged on the frame 1 above the cutter shaft 4; the supporting arm 8 is movably connected with the cutter shaft 4 through a shaft sleeve. The purpose of providing the support arm 8 is: so that the supporting arm 8 can give a certain limit and support to the cutter shaft 4 through the shaft sleeve, and the problem that the cutter shaft 4 is easily bent is avoided.

The circumferential surface of the cutter shaft 4 is provided with a plurality of cutter seats 7 in a spiral shape. The purpose of spirally arranging the tool apron 7 is as follows: so that the rotary blades 5 can be sequentially driven into the soil according to a certain sequence in the working process, thereby reducing the number of the rotary blades 5 driven into the soil simultaneously and reducing the energy consumption.

The tool apron 7 is provided with a rotary blade 5 (see the attached figure 1 of the specification) through a bolt; the whole rotary tillage cutter 5 is in an L-shaped structure (see the attached figure 9 in the specification); the whole rotary blade 5 is designed into an L-shaped structure, and the aim is as follows: so that the rotary blade 5 can crush soil as much as possible through the bent part of the blade shaft 4 in the process of rotating along with the blade shaft 4, thereby achieving the purpose of enhancing the soil crushing efficiency.

A plurality of locking holes 32 are arranged side by side at the vertical end of the rotary blade 5; the rotary blade 5 is fixedly arranged on the blade holder 7 through the locking hole 32; the section of the rotary blade 5 is in a right-angled triangle structure, and the sharp corner of the triangular structure of the section of the rotary blade 5 is the blade part of the rotary blade 5 (see the attached figure 9 in the specification). So set up rotary blade 5's aim at: firstly, make rotary blade 5 can contact with soil earlier through the blade part of "angle point", make it can reach "quick" soil of cutting, reduce the purpose that the resistance reduces the energy consumption. Secondly, in the process that the rotary tillage blades 5 cut into the soil, the reaction force applied by the soil can be applied to the cutter shaft 4 through the inclined plane part of the triangular structure of the rotary tillage blades 5, so that the cutter shaft 4 always has a tendency of closing with the output shaft of the gearbox 3 under the action of the horizontal component of the reaction force, and the output shaft of the gearbox 3 is changed from a traditional 'pulled' state to a 'pressed' state, so that the main connecting disc 9, the buffer diaphragm 16, the buffer pad 14 and the auxiliary connecting disc 10 can be tightly attached to each other, and the problem of 'easy abrasion' when a gap exists is avoided; meanwhile, the characteristic that the shaft parts have strong compression performance and tension performance is utilized, so that the risk of breakage of the output shaft of the gearbox 3 is reduced.

Grass-prevention rods 6 are welded on the cutter holders 7 on the cutter shaft 4, which are positioned on the same spiral line (see the attached figure 10 in the specification). Prevent that grass pole 6 is the spiral, will prevent that grass pole 6 sets into spiral aim at: so that when the grass-guard 6 cuts weeds, gradient stress is formed, and the problem of high energy consumption caused by over-concentrated cutting stress in the grass cutting process is prevented.

When the rotary cultivator with the anti-broken shaft function works, the rotary cultivator is hung on the rear hanger of a tractor (such as a tractor) through the suspension bracket 2, and the height of the rotary cultivator is adjusted. When the tractor drives the rotary cultivator to walk, the output shaft of the gearbox 3 drives the rotary blade 5 to rotate through the blade shaft 4; the rotary blades 5 are sequentially driven into the soil in a certain sequence during the rotation process, so that the purpose of stably crushing the soil is achieved.

The rotary cultivator with the shaft breakage prevention function has the advantages of simple structure and ingenious design, and adopts the structural design that the flexible connector is adopted to connect the cutter shaft with the gearbox; after adopting this kind of design, flexible connector during operation can provide certain buffering space and buffer power to make gearbox 3 can only transmit the moment of torsion to arbor 4 through flexible connector on, effectively solved when arbor 4 takes place to buckle the uneven cracked problem of output shaft that leads to gearbox 3 of atress. This application has still adopted in addition to set up support arm 8 on frame 1 to carry out spacing structural design who supports to arbor 4 through support arm 8, so its risk that will greatly reduced arbor 4 is crooked. In addition, the main connecting disc 9 and the auxiliary connecting disc 10 are installed in a conical meshing mode, and the service life of the existing connecting structure is relatively prolonged. So this rotary cultivator not only solves the problem of the output shaft "easy fracture" of current rotary cultivator gearbox assembly, has still solved the problem that current connection structure exists that wearing and tearing are fast and life is short, has satisfied the needs that people used.

Claims

1. A rotary cultivator with a shaft breakage prevention structure is composed of a frame (1), a suspension bracket (2), a gear box (3), a cutter shaft (4), rotary tillage cutters (5), a grass prevention rod (6) and a cutter holder (7); a gearbox (3) is arranged in the middle of the frame (1), and a suspension bracket (2) is arranged above the gearbox (3); the two sides below the gear box (3) are symmetrically provided with cutter shafts (4); one end of the cutter shaft (4) is connected with the frame (1) through a bearing seat; the method is characterized in that: the other end of the cutter shaft (4) is connected with an output shaft of the gearbox (3) through a flexible connector; a support arm (8) is fixedly arranged on the machine frame (1) above the cutter shaft (4); the supporting arm (8) is movably connected with the cutter shaft (4) through a shaft sleeve; a plurality of tool holders (7) are spirally arranged on the circumferential surface of the cutter shaft (4), and rotary blades (5) are arranged on the tool holders (7) through bolts; grass-prevention rods (6) are welded on the cutter seats (7) which are positioned on the same spiral line.

2. The rotary cultivator with the anti-broken shaft structure as claimed in claim 1, wherein: the flexible connector is composed of a main connecting disc (9), an auxiliary connecting disc (10), a locking nut (11), a locking sheet (12), an oil seal gland (13), a buffer pad (14) and a buffer diaphragm (16); one end of the cutter shaft (4) is fixedly provided with a main connecting disc (9) through a locking nut (11); an auxiliary connecting disc (10) is fixedly arranged on an output shaft of the gearbox (3) on one side of the main connecting disc (9) through a locking nut (11) and a locking sheet (12); the main connecting disc (9) and the auxiliary connecting disc (10) are connected in a clamping manner through a cushion pad (14); an oil seal (15) is arranged on the gearbox (3) at one side of the auxiliary connecting disc (10) through an oil seal gland (13).

3. The rotary cultivator with the anti-broken shaft structure as claimed in claim 2, wherein: the main connecting disc (9) is of an integrated structure; the cross section of the utility model is in a convex structure; an assembly counter bore (17) is formed in the end face of the outer end of the main connecting disc (9); one side of the assembly counter bore (17) is provided with a conical assembly through hole (18); a plurality of spline grooves are uniformly formed in the inner surface of the assembling through hole (18); one end of the cutter shaft (4) is of a conical structure; a plurality of spline teeth are uniformly distributed on the conical circumferential surface of the cutter shaft (4); spline teeth of the cutter shaft (4) are meshed and connected with spline grooves of the main connecting disc (9); a plurality of clamping teeth (20) are uniformly arranged on the inner wall of the assembly counter bore (17); one end of the clamping tooth (20) extends to the outer end of the assembly counter bore (17).

4. The rotary cultivator with the anti-broken shaft structure as claimed in claim 3, wherein: the auxiliary connecting disc (10) is of an integrated structure; the cross section of the utility model is in a convex structure; an assembly counter bore (17) is formed in the end face of the outer end of the auxiliary connecting disc (10); one side of the assembly counter bore (17) is provided with a conical assembly through hole (18); a plurality of spline grooves are uniformly formed in the inner surface of the assembling through hole (18); the output shaft of the gearbox (3) is a conical shaft, a plurality of spline teeth are uniformly distributed on the conical circumferential surface of the output shaft of the gearbox (3), and the spline teeth are meshed and connected with the spline grooves of the auxiliary connecting disc (10); a plurality of clamping teeth (20) are uniformly arranged on the inner wall of the assembly counter bore (17); one end of the clamping tooth (20) extends to the outer end of the assembly counter bore (17).

5. The rotary cultivator with the anti-broken shaft structure as claimed in claim 4, wherein: the buffer pad (14) is formed by injection molding of plastic materials with elastic characteristics and consists of a support ring (19) and buffer teeth (21); a plurality of buffer teeth (21) are uniformly distributed on the circumferential surface of the support ring (19); the buffer teeth (21) are consistent with the clamping teeth (20) of the main connecting disc (9) and the clamping teeth (20) of the auxiliary connecting disc (10) in structure and are mutually connected with the buffer teeth; one side surface of the buffer tooth (21) is in fit connection with the clamping tooth (20) of the connecting disc (9), and the other side surface of the buffer tooth (21) is in fit connection with the clamping tooth (20) of the auxiliary connecting disc (10).

6. The rotary cultivator with the anti-broken shaft structure as claimed in claim 4, wherein: a plurality of buffer diaphragms (16) are arranged between the edges of the main connecting disc (9) and the auxiliary connecting disc (10); the outer diameter of the buffer membrane (16) is consistent with the outer diameter of the main connecting disc (9) and the outer diameter of the auxiliary connecting disc (10); the inner wall of the buffer diaphragm (16) is in fit connection with the outer surfaces of the clamping teeth (20) of the main connecting disc (9) and the clamping teeth (20) of the auxiliary connecting disc (10).

7. The rotary cultivator with the anti-broken shaft structure as claimed in claim 1, wherein: the whole rotary blade (5) is of an L-shaped structure; a plurality of locking holes (37) are arranged side by side at the vertical end head of the rotary blade (5); the rotary blade (5) is fixedly arranged on the blade holder (7) through the locking hole (37); the section of the rotary blade (5) is of a right-angled triangle structure, and the sharp corner part of the triangle structure of the section of the rotary blade (5) is the blade part of the rotary blade (5).

8. The rotary cultivator with the anti-broken shaft structure as claimed in claim 1, wherein: the straw-proof rod (6) is spiral, and one end of the straw-proof rod (6) is in contact with the rack (1).

9. The rotary cultivator with the anti-broken shaft structure as claimed in claim 1, wherein: the bearing seat is composed of a bearing seat body (22), an inner protective cover (23) and an outer protective cover (24), wherein the outer protective cover (24) is fixedly arranged on one side of the bearing seat body (22) through bolts, and the inner protective cover (23) is movably arranged on the other side of the bearing seat body (22); the bearing seat body (22) is a cylinder with a convex section, a limiting flange (25) is arranged in the middle of an inner hole of the bearing seat body (22), and an oil seal mounting position (26) and a bearing mounting position (27) are sequentially arranged on one side of the limiting flange (25); a sealing ring groove (28) is arranged on the bearing seat body (22) on the other side of the limiting flange (25); the outer ring of the sealing ring groove (28) is provided with an assembling ring groove (29).

10. The rotary cultivator with the anti-broken shaft structure of claim 9, wherein: a plurality of reinforcing blocks (30) are uniformly distributed in the assembling ring groove (29); the reinforcing block (30) is provided with fixing holes (31), and each fixing hole (31) extends into the bearing seat body (22) and penetrates through the bearing seat body; a plurality of assembling holes (33) are uniformly distributed on the end surfaces of the outer protective cover (24) and the bearing seat body (22), and the outer protective cover (24) and the bearing seat body (22) are fixedly connected through the assembling holes (33) by bolts; a plurality of reinforcing ribs (34) are uniformly distributed on the circumferential surface of the bearing seat body (22), and each reinforcing rib (34) corresponds to each assembling hole (33); a cavity (35) is arranged at the center part of the outer protective cover (24); the inner shield (23) is barrel-shaped, and the center of the inner shield (23) is provided with a mounting hole (36).