阅读说明：本技术 用于草地透气机的刀具组件的快装组件 (Quick assembly of cutter assembly for grassland air breathing machine ) 是由 葛树兴 陈坚跃 张小荣 丰新宇 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种用于草地透气机的刀具组件的快装组件,其要点是：包括挂脚固定座、压紧座和锁定装置；压紧座一端转动连接设置在挂脚固定座上,压紧座可以转动打开或闭合,闭合时另一端通过锁定装置与挂脚固定座形成限位固定连接；刀具组件的左端转动设置在挂脚固定座与压紧座中,刀具组件的左端可拆卸设置在挂脚固定座与压紧座中。本发明的用于草地透气机的刀具组件的快装组件结构简单,操作方便,只需单手就能打开或闭合压紧座,省时省力。(The invention discloses a quick assembly of a cutter assembly for a grassland air breathing machine, which is characterized in that: comprises a hanging foot fixing seat, a pressing seat and a locking device; one end of the pressing seat is rotatably connected and arranged on the hanging foot fixing seat, the pressing seat can be rotatably opened or closed, and the other end of the pressing seat is in limit fixed connection with the hanging foot fixing seat through a locking device when the pressing seat is closed; the left end of the cutter component is rotatably arranged in the hitching leg fixing seat and the pressing seat, and the left end of the cutter component can be detachably arranged in the hitching leg fixing seat and the pressing seat. The fast-assembly component of the cutter component for the grassland ventilating machine is simple in structure and convenient to operate, and the compressing seat can be opened or closed by only one hand, so that time and labor are saved.)

1. The utility model provides a fast-assembling subassembly that is used for cutter unit of meadow to pass through machine, its characterized in that: comprises a hanging foot fixing seat, a pressing seat and a locking device; one end of the pressing seat is rotatably connected and arranged on the hanging foot fixing seat, the pressing seat can be rotatably opened or closed, and the other end of the pressing seat is in limit fixed connection with the hanging foot fixing seat through a locking device when the pressing seat is closed; the left end of the cutter component is rotatably arranged in the hitching leg fixing seat and the pressing seat, and the left end of the cutter component can be detachably arranged in the hitching leg fixing seat and the pressing seat.

2. The quick load assembly of claim 1 for a cutter assembly of a lawn aerator, further comprising: the cutter component moves horizontally to form detachable transmission connection with the gearbox.

3. The quick load assembly of claim 1 for a cutter assembly of a lawn aerator, further comprising: the device also comprises a torsion spring; the pressing seat is rotatably connected to the lower side of the rear part of the hitching leg fixing seat through a corresponding positioning pin from the rear part of the pressing seat; the torsional spring cover is on this locating pin, and the one end setting of torsional spring is on the hitching leg fixing base, and the other end setting is on compressing tightly the seat, and when compressing tightly seat and hitching leg fixing base and being in the closure state, the torsional spring is in the state that compresses tightly.

4. The quick-mount assembly of a cutter assembly for a lawn aerator as claimed in any one of claims 1 to 3, wherein: a cutter mounting groove with a downward opening is formed in the middle of the hitching leg fixing seat; the cutter mounting groove comprises an upper bearing seat section and an upper cutter shaft section; the section of the upper bearing seat section of the cutter mounting groove is semicircular, and the radius of the upper bearing seat section is the same as that of a corresponding cutter shaft bearing seat on the cutter assembly; the axial width of the cutter mounting groove is 0.5-1.5 cm greater than the left-right width of the cutter shaft bearing seat; the section of the upper cutter shaft section is semicircular, and the radius of the upper cutter shaft section is larger than that of the corresponding cutter shaft part on the cutter; the upper bearing seat section and the upper cutter shaft section are coaxially arranged and are coaxial with a power output shaft of the gearbox;

a lower cutter mounting groove with an upward opening is formed in the right side of the middle of the pressing seat; the lower cutter mounting groove comprises a lower bearing seat section and a lower cutter shaft section; the section of the lower bearing seat section of the lower cutter mounting groove is semicircular, and the radius of the lower bearing seat section is the same as that of the cutter mounting groove; the axial width of the cutter mounting groove is equal to the left-right width of the cutter shaft bearing seat; the section of the lower cutter shaft section is semicircular, and the radius of the lower cutter shaft section is larger than that of the upper cutter shaft section of the cutter mounting groove; the lower bearing block section and the lower cutter shaft section are coaxially arranged; when the pressing seat and the hitching leg fixing seat are in a closed state, an upper bearing seat section of the cutter mounting groove and a lower bearing seat section of the lower cutter mounting groove form a cutter shaft bearing seat mounting hole;

the middle part left part that compresses tightly the seat is equipped with the spacing portion of axial, and the spacing portion of axial is cylindricly, and the coaxial setting is in the left side of the lower bearing seat section of cutter mounting groove down, and the width in the axial of the spacing portion of axial equals the width in the axial of cutter mounting groove and subtracts the width in the left-right direction of arbor bearing frame.

5. The quick-mount assembly of a cutter assembly for a lawn aerator as claimed in any one of claims 1 to 3, wherein: the front part of the hitching leg fixing seat is provided with a mounting part which protrudes downwards; the front part of the pressing seat is provided with a connection limiting part which protrudes forwards; the locking device comprises a bolt and a bolt handle; the lock tongue is arranged on the lower side of the mounting part of the hitching leg fixing seat in a front-back sliding manner, and the lock tongue is driven to slide by the lock tongue handle; the spring bolt is spacing from the below to the spacing portion of being connected that compresses tightly the seat to will compress tightly the spacing fixed connection of seat on hitching leg fixing base, be in the closure state.

6. The quick load assembly of claim 5 for a cutter assembly of a lawn aerator, wherein: the connection limiting part of the pressing seat is provided with a guide cambered surface facing the front upper part; the rear part of the lock tongue is provided with a guide surface facing to the rear lower part; the guide arc surface connected with the limiting part is in a tangent state when being contacted with the guide surface of the lock tongue.

7. The quick load assembly of claim 5 for a cutter assembly of a lawn aerator, wherein: the locking device also comprises a return spring, the spring bolt handle drives the spring bolt to move forwards, and the return spring drives the spring bolt to move backwards in a return mode.

8. The quick load assembly of claim 7 for a cutter assembly of a lawn aerator, further comprising: l-shaped limiting plates are symmetrically arranged on the left side and the right side of the lower side of the mounting part of the hitching leg fixing seat; a limiting groove which penetrates through the limiting plate and the mounting part in the front-back direction is formed between the limiting plate and the mounting part; the openings of the two limiting grooves are oppositely arranged; the middle part of the lower side of the mounting part is provided with a limiting block which protrudes downwards, the limiting block is positioned between the two limiting plates, and the front end surface of the limiting block is level with the front side surfaces of the two limiting plates;

the middle part of the lock tongue is provided with a spring groove with an upward opening in the front-back direction, and the front part of the spring groove is communicated forwards; the spring bolt is arranged in the limiting groove of the mounting part of the hitching leg fixing seat in a sliding manner along the front-back direction from the left side and the right side of the spring bolt, and the limiting block is positioned in the spring groove; the reset spring is arranged in the spring groove, the front end of the reset spring is propped against the limiting block and is in a compressed state; the middle part of the front part of the lock tongue is provided with an insertion groove which penetrates through the upper part and the lower part of the lock tongue; the spring bolt handle is fixedly arranged in the insertion groove of the spring bolt in an insertion mode, and the left end and the right end of the spring bolt handle are located on the front side of the limiting plate of the installation portion.

9. The quick load assembly of claim 8 for a cutter assembly of a lawn aerator, further comprising: the left side and the right side of the rear part of the lock tongue are provided with stroke limiting parts which are used for limiting the lock tongue forwards.

Technical Field

The invention relates to the technical field of electric tools, in particular to a quick assembly of a cutter assembly for a grassland air breathing machine.

Background

The grassland ventilating machine is used for improving the air permeability of grasslands and is beneficial to the growth of the grasslands. Cutter assemblies for lawn ventilators are typically of two types, a wire claw assembly for cleaning debris such as fallen leaves on the lawn surface, and a blade assembly for loosening the soil on the lawn surface, the wire claw assembly and the blade assembly being collectively referred to as a cutter assembly. When in use, the corresponding cutter components are replaced according to different requirements. The cutter assembly of the existing grassland air breathing machine generally comprises a rotating shaft, a steel wire claw or a blade fixed on the rotating shaft and a hitching leg arranged at one end of the rotating shaft, wherein a bearing is arranged in the hitching leg, the cutter assembly is detachably connected with the machine body of the grassland air breathing machine through the hitching leg, and the cutter assembly is connected with a gearbox and adopts the detachable connection of the rotating shaft (namely a cutter shaft) and the power output shaft of the gearbox. The hitching leg is required to be integrally disassembled through tools during replacement, so that the cutter assembly can be taken out, time and labor are wasted, and the rotating shaft and the power output shaft of the gearbox are at a certain included angle during disassembly, so that the gearbox is easily damaged.

Disclosure of Invention

The invention aims to provide a quick assembly which is simple in structure and can realize replacement of a cutter assembly of a grassland air breathing machine without tools.

The basic technical scheme for realizing the purpose of the invention is as follows: the utility model provides a fast-assembling subassembly that is used for cutter unit spare of meadow to pass through machine, its structural feature is: comprises a hitching leg fixing seat, a pressing seat and a locking device. One end of the pressing seat is rotatably connected to the hanger fixing seat, the pressing seat can be rotatably opened or closed, and the other end of the pressing seat is fixedly connected with the hanger fixing seat in a limiting mode through the locking device during closing. The left end of the cutter component is rotatably arranged in the hitching leg fixing seat and the pressing seat, and the left end of the cutter component can be detachably arranged in the hitching leg fixing seat and the pressing seat.

The technical scheme based on the basic technical scheme is as follows: the cutter component moves horizontally to form detachable transmission connection with the gearbox.

The technical scheme based on the corresponding technical schemes is as follows: also included is a torsion spring. The compressing seat is rotatably connected to the lower side of the rear part of the hitching leg fixing seat through a corresponding positioning pin at the rear part of the compressing seat. The torsional spring cover is on this locating pin, and the one end setting of torsional spring is on the hitching leg fixing base, and the other end setting is on compressing tightly the seat, and when compressing tightly seat and hitching leg fixing base and being in the closure state, the torsional spring is in the state that compresses tightly.

The technical scheme based on the corresponding technical schemes is as follows: the middle part of the hitching leg fixing seat is provided with a cutter mounting groove with a downward opening. The cutter mounting groove comprises an upper bearing seat section and an upper cutter shaft section. The section of the upper bearing seat section of the cutter mounting groove is semicircular, and the radius of the upper bearing seat section is the same as that of the corresponding cutter shaft bearing seat on the cutter assembly. The axial width of the cutter mounting groove is 0.5-1.5 cm greater than the left-right width of the cutter shaft bearing seat. The section of the upper cutter shaft section is semicircular, and the radius of the upper cutter shaft section is larger than that of the corresponding cutter shaft part on the cutter. The upper bearing seat section and the upper cutter shaft section are coaxially arranged and are coaxial with a power output shaft of the gearbox.

The right side of the middle part of the pressing seat is provided with a lower cutter mounting groove with an upward opening. The lower cutter mounting groove comprises a lower bearing seat section and a lower cutter shaft section. The section of the lower bearing seat section of the lower cutter mounting groove is semicircular, and the radius of the lower bearing seat section is the same as that of the cutter mounting groove. The axial width of the cutter mounting groove is equal to the left-right width of the cutter shaft bearing seat. The section of the lower cutter shaft section is semicircular, and the radius of the lower cutter shaft section is larger than that of the upper cutter shaft section of the cutter mounting groove. The lower bearing block section and the lower cutter shaft section are coaxially arranged. When the pressing seat and the hitching leg fixing seat are in a closed state, an upper bearing seat section of the cutter mounting groove and a lower bearing seat section of the lower cutter mounting groove form a cutter shaft bearing seat mounting hole.

The middle part left part that compresses tightly the seat is equipped with the spacing portion of axial, and the spacing portion of axial is cylindricly, and the coaxial setting is in the left side of the lower bearing seat section of cutter mounting groove down, and the width in the axial of the spacing portion of axial equals the width in the axial of cutter mounting groove and subtracts the width in the left-right direction of arbor bearing frame.

The technical scheme based on the corresponding technical schemes is as follows: the front part of the hitching leg fixing seat is provided with a mounting part which protrudes downwards. The front part of the pressing seat is provided with a connection limiting part protruding forwards. The locking device comprises a bolt and a bolt handle. The spring bolt slides along the front and back to setting on the downside of the installation department of hitching leg fixing base, drives the spring bolt slip by the spring bolt handle. The spring bolt is spacing from the below to the spacing portion of being connected that compresses tightly the seat to will compress tightly the spacing fixed connection of seat on hitching leg fixing base, be in the closure state.

The technical scheme based on the corresponding technical schemes is as follows: the connection limiting part of the pressing seat is provided with a guide cambered surface facing towards the front upper part. The rear part of the lock tongue is provided with a guide surface facing the rear lower part. The guide arc surface connected with the limiting part is in a tangent state when being contacted with the guide surface of the lock tongue.

The technical scheme based on the corresponding technical schemes is as follows: the locking device also comprises a return spring, the spring bolt handle drives the spring bolt to move forwards, and the return spring drives the spring bolt to move backwards in a return mode.

The technical scheme based on the corresponding technical schemes is as follows: l-shaped limiting plates are symmetrically arranged on the left side and the right side of the lower side of the mounting part of the hitching leg fixing seat. A limit groove which penetrates through the limiting plate and the mounting part in the front-back direction is formed between the limiting plate and the mounting part. The openings of the two limiting grooves are oppositely arranged. The downside middle part of installation department is equipped with the stopper of downward bulge, and the stopper is located between two limiting plates, and its preceding terminal surface is flat mutually with the leading flank of two limiting plates.

The middle part of the lock tongue is provided with a spring groove with an upward opening in the front-back direction, and the front part of the spring groove is communicated forwards. The spring bolt is arranged in the limiting groove of the mounting part of the hitching leg fixing seat in a sliding manner along the front-back direction from the left side and the right side of the spring bolt, and the limiting block is positioned in the spring groove. The reset spring is arranged in the spring groove, the front end of the reset spring is propped against the limiting block, and the reset spring is in a compression state. The middle part of the front part of the lock tongue is provided with an inserting groove which penetrates through the upper part and the lower part of the lock tongue. The spring bolt handle is fixedly arranged in the insertion groove of the spring bolt in an insertion mode, and the left end and the right end of the spring bolt handle are located on the front side of the limiting plate of the installation portion.

The technical scheme based on the corresponding technical schemes is as follows: the left side and the right side of the rear part of the lock tongue are provided with stroke limiting parts which are used for limiting the lock tongue forwards.

The invention has the positive effects that: (1) the fast-assembly component of the cutter component for the grassland ventilating machine is simple in structure and convenient to operate, and the compressing seat can be opened or closed by only one hand, so that time and labor are saved.

(2) The width of the cutter mounting groove of the hitching leg fixing seat in the axial direction (namely the width in the left-right direction in figure 1) is 0.5-1.5 cm larger than the width in the left-right direction of the cutter shaft bearing seat, and a horizontal insertion mode is adopted when the cutter shaft assembly and the gearbox are installed, so that the damage to the gearbox caused by inclined insertion is avoided, and the service life of the equipment is greatly prolonged.

(3) The axial limiting part is arranged on the pressing seat, after the upper cutter shaft assembly is installed, the axial limiting part is positioned in the left part of the upper bearing seat section of the cutter installation groove of the hitching leg fixing seat, and the cutter shaft bearing seat is positioned in the right part of the upper bearing seat section, so that the axial limiting part limits the cutter shaft bearing seat in the axial direction, the cutter shaft bearing seat is limited from moving leftwards, and the connection reliability of the cutter assembly and the gearbox is ensured.

(4) The front part of the pressing seat is provided with a forward protruding connection limiting part, the connection limiting part is provided with a forward upward guide arc surface, the rear part of the lock tongue of the locking device is provided with a backward downward guide surface, the pressing seat can be pressed during closing operation, the lock tongue moves forward under the extrusion action of the pressing seat, and after the guide arc surface of the connection limiting part of the pressing seat is separated from the guide surface of the lock tongue of the locking device, the lock tongue moves backward under the action of the reset spring to be below the connection limiting part of the pressing seat, and then the connection limiting part of the pressing seat is limited and fixed. When the locking bolt is opened, the locking bolt handle is pulled by only one hand to enable the locking bolt to move forwards to be separated from the connection limiting part of the pressing seat, the operation is simple and convenient, and tools are not needed.

(5) The left side and the right side of the rear part of the spring bolt are provided with the stroke limiting parts, when the spring bolt is pulled forwards through the spring bolt handle, the stroke limiting parts are used for limiting the spring bolt forwards, when the spring bolt moves forwards and is completely positioned below the mounting part of the hitching leg fixing seat, the spring bolt is not allowed to move forwards, the reset spring is protected, the spring bolt is prevented from being further compressed, and the service life of the spring bolt is prolonged.

Drawings

FIG. 1 is a schematic view of the knife assembly (blade assembly) of the present invention mounted on the quick mount assembly.

Fig. 2 is a rear view of fig. 1.

Fig. 3 is a left side view of fig. 1.

Fig. 4 is a right-side schematic view of fig. 1.

Fig. 5 is a schematic top view of fig. 1.

Fig. 6 is a schematic bottom view of fig. 1.

Fig. 7 is a schematic view as viewed from the upper right front of fig. 1.

Fig. 8 is a schematic view when viewed from the left front lower side of fig. 1.

FIG. 9 is a schematic view of the package assembly shown in FIG. 1, as viewed from the front left and below, in an open position for removal of the cutter assembly.

FIG. 10 is a cross-sectional view A-A of the quick load assembly of FIG. 1.

FIG. 11 is an exploded view of the lock assembly of the package as viewed from the front left lower side of FIG. 1.

FIG. 12 is an exploded view of the lock assembly of the package as viewed from the top left front of FIG. 1.

Figure 13 is a schematic view of the cutter assembly as mounted on a corresponding lawn ventilator body by the quick-assembly.

FIG. 14 is a schematic view of the cutter assembly when mounted with the quick load assembly and the transmission.

The reference numbers in the above figures are as follows:

a hanging foot fixing seat 1 is arranged on the hanging foot fixing seat,

a cutter mounting groove 1-1, an upper bearing seat section 1-11, an upper cutter shaft section 1-12,

a clamping groove 1-2 of the torsion spring,

1-3 parts of mounting part, 1-31 parts of limit plate, 1-32 parts of limit groove, 1-33 parts of limit block,

a pressing seat 2, a lower cutter mounting groove 2-1, a lower bearing seat section 2-11, a lower cutter shaft section 2-12,

an axial limiting part 2-2, a connecting limiting part 2-3, a guide cambered surface 2-31,

a locking device 3, a bolt 3-1, a guide surface 3-11, a spring groove 3-12, an insertion groove 3-13, a stroke limiting part 3-14, a bolt handle 3-2, a return spring 3-3,

the torsion spring 4 is provided with a torsion spring,

the cutter shaft bearing seat comprises a machine body 10-1, a gearbox 10-2, a cutter assembly 10-3 and a cutter shaft bearing seat 10-31.

Detailed Description

The orientation of the present invention is described according to the orientation shown in fig. 1, that is, the up-down and left-right directions shown in fig. 1 are the up-down and left-right directions described, and the side facing fig. 1 is the front side and the side facing away from fig. 1 is the rear side.

(example 1)

Referring to fig. 1 to 13, the fast assembly of the cutter assembly for the grassland air breathing machine comprises a hitching leg fixing seat 1, a pressing seat 2 and a locking device 3.

Referring to fig. 1 to 13, the hitching leg fixing base 1 is an injection molding integrated piece. The hitching leg fixing seat 1 is fixedly arranged on the lower side of the left part of the machine body 10-1. The middle part of the hitching leg fixing seat 1 is provided with a cutter mounting groove 1-1 with a downward opening. The cutter mounting groove 1-1 comprises an upper bearing seat section 1-11 and an upper cutter shaft section 1-12. The section of the upper bearing seat section 1-11 of the cutter mounting groove 1-1 is semicircular, and the radius of the upper bearing seat section is the same as or corresponding to the radius of the corresponding cutter shaft bearing seat 10-31 on the cutter assembly 10-3. The width (left-right width) of the cutter mounting groove 1-1 in the axial direction is 0.8 cm to 1.5 cm larger than the left-right width of the cutter shaft bearing seat 10-31. The section of the upper cutter shaft section 1-12 is semicircular, and the radius of the upper cutter shaft section is larger than that of the corresponding cutter shaft part on the cutter 10-3. The upper bearing seat section 1-11 and the upper cutter shaft section 1-12 are coaxially arranged and are coaxial with a power output shaft of the gearbox 10-2.

The rear part of the hitching leg fixing seat 1 is provided with a torsion spring clamping groove 1-2 with a downward opening in the front-back direction, the front part of the torsion spring clamping groove 1-2 is communicated with an upper bearing seat section 1-11 of the cutter mounting groove 1-1 forward, and the rear part of the torsion spring clamping groove 1-2 is communicated with the rear part backwards.

The front part of the hitching leg fixing seat 1 is provided with a mounting part 1-3 which protrudes downwards. L-shaped limit plates 1-31 are symmetrically arranged at the left side and the right side of the lower side of the mounting part 1-3. And limiting grooves 1-32 which penetrate through the front and the back are formed between the limiting plates 1-31 and the mounting parts 1-3. The openings of the two limiting grooves 1-32 are oppositely arranged. The middle part of the lower side of the mounting part 1-3 is provided with a limiting block 1-33 which protrudes downwards, the limiting block 1-33 is positioned between the two limiting plates 1-31, and the front end surface of the limiting block 1-33 is level with the front side surfaces of the two limiting plates 1-31.

As shown in fig. 1 to 13, the pressing base 2 is an injection-molded integral piece. The compressing seat 2 is rotatably connected to the lower side of the rear part of the hitching leg fixing seat 1 through a corresponding positioning pin from the rear part thereof. The torsion spring 4 is sleeved on the locating pin, one end of the torsion spring 4 is positioned in the torsion spring clamping groove 1-2 of the hitching leg fixing seat 1, and the other end of the torsion spring 4 is arranged on the pressing seat 2 and is used for enabling the pressing seat 2 and the hitching leg fixing seat 1 to be in an open state (see fig. 11). When the compressing seat 2 and the hitching leg fixing seat 1 are in a closed state (see fig. 2), the torsion spring 4 is in a compressing state.

A lower cutter mounting groove 2-1 with an upward opening is arranged on the right side of the middle part of the pressing seat 2. The lower cutter mounting groove 2-1 comprises a lower bearing seat section 2-11 and a lower cutter shaft section 2-12. The section of the lower bearing seat section 2-11 of the lower cutter mounting groove 2-1 is semicircular, and the radius of the lower bearing seat section is the same as that of the cutter mounting groove 1-1. The width (left-right width) of the cutter mounting groove 1-1 in the axial direction is equal to the left-right width of the cutter shaft bearing seat 10-31. The section of the lower cutter shaft section 2-12 is semicircular, and the radius of the lower cutter shaft section is larger than that of the upper cutter shaft section 1-12 of the cutter mounting groove 1-1. The lower bearing block section 2-11 and the lower cutter shaft section 2-12 are coaxially arranged. When the pressing seat 2 and the hitching leg fixing seat 1 are in a closed state (see fig. 2), an upper bearing seat section 1-11 of the cutter mounting groove 1-1 and a lower bearing seat section 2-11 of the lower cutter mounting groove 2-1 form a cutter shaft bearing seat mounting hole.

The left part of the middle part of the pressing seat 2 is provided with an axial limiting part 2-2, the axial limiting part 2-2 is cylindrical and is coaxially arranged on the left side of a lower bearing seat section 2-11 of the lower cutter mounting groove 2-1, and the axial width of the axial limiting part 2-2 is equal to the axial width (the left-right width) of the cutter mounting groove 1-1 minus the left-right width of the cutter shaft bearing seat 10-31. When the pressing seat 2 and the hitching leg fixing seat 1 are in a closed state (see fig. 2), the axial limiting part 2-2 of the pressing seat 2 is positioned in the left part of the upper bearing seat section 1-11 of the cutter mounting groove 1-1, and the cutter shaft bearing seat 10-31 is positioned in the right part of the upper bearing seat section 1-11, so that the cutter shaft bearing seat 10-31 is limited in the axial direction by the axial limiting part 2-2, and the cutter shaft bearing seat 10-31 is limited from moving leftwards.

The front part of the pressing seat 2 is provided with a forward convex connection limiting part 2-3. The connection limiting part 2-3 is provided with a guide arc surface 2-31 facing towards the front upper part.

Referring to fig. 1 to 13, the locking device 3 includes a latch bolt 3-1, a latch bolt handle 3-2, and a return spring 3-3. The bolt 3-1 is an injection molding integrated piece, and the rear part of the bolt 3-1 is provided with a guide surface 3-11 facing to the rear lower part. The middle part of the lock tongue 3-1 is provided with a spring groove 3-12 with an upward opening along the front-back direction, and the front part of the spring groove 3-12 is communicated forwards. The lock tongue 3-1 is arranged in the limiting groove 1-32 of the mounting part 1-3 of the hitching leg fixing seat 1 in a sliding way along the front and back directions from the left side and the right side, and the limiting block 1-33 is arranged in the spring groove 3-12. The return spring 3-3 is arranged in the spring groove 3-12, the front end of the return spring is propped against the limiting block 1-33, and the return spring is in a compressed state. The middle part of the front part of the lock tongue 3-1 is provided with an insertion groove 3-13 which penetrates through the upper part and the lower part, a lock tongue handle 3-2 is inserted in the insertion groove 3-13 of the lock tongue 3-1 and is fixedly connected on the lock tongue 3-1 through screws, the left end and the right end of the lock tongue handle 3-2 are positioned at the front sides of a limiting plate 1-31 and a limiting block 1-33 of an installation part 1-3, so as to limit the lock tongue 3-1 backwards, the lock tongue 3-1 slides forwards by pulling the lock tongue handle 3-2 forwards, the lock tongue 3-1 slides backwards by a reset spring 3-3 after releasing the lock tongue handle 3-2, at the moment, the rear part of the lock tongue 3-1 extends backwards out of the installation part 1-3 of the hitching fixed seat 1, and limits and fixes the connection limiting part 2-3 of the pressing seat, so that the pressing seat 2 and the hitching leg fixing seat 1 are in a closed state. The left side and the right side of the rear part of the bolt 3-1 are provided with stroke limiting parts 3-14, when the bolt 3-1 is pulled forwards through the bolt handle 3-2, the stroke limiting parts 3-14 are used for limiting the bolt 3-1 forwards, and when the bolt 3-1 moves forwards and is completely positioned below the mounting part 1-3 of the hitching leg fixing seat 1, the bolt 3-1 is prevented from continuing to move forwards, so that the reset spring 3-3 is protected, the reset spring is prevented from being further compressed, and the service life of the reset spring is prolonged.

When the cutter assembly 10-3 is installed on the fast-assembly of the cutter assembly for the grassland ventilating machine, the spring bolt 3-1 is pulled forwards through the spring bolt handle 3-2, when the spring bolt 3-1 moves forwards and is completely positioned below the installation part 1-3 of the hitching leg fixing seat 1, the spring bolt 3-1 is completely separated from the connection limiting part 2-3 of the pressing seat 2, and the pressing seat 2 rotates to be opened under the action of the torsion spring 4. The left end of a cutter shaft bearing seat 10-31 of the cutter assembly 10-3 is placed in the left part of a cutter mounting groove 1-1 of a hitching leg fixing seat 1, the left end of the cutter assembly 10-3 is rotatably arranged in the cutter shaft bearing seat 10-31 through a bearing, then the cutter assembly 10-3 is horizontally moved rightwards, a right end square hole of a cutter shaft of the cutter assembly 10-3 is sleeved on a power output shaft of a gearbox 10-2, the power output shaft is a corresponding square shaft, so that the cutter shaft of the cutter assembly 10-3 is detachably connected with the gearbox 10-2 in a transmission manner, and the cutter shaft bearing seat 10-31 of the left end of the cutter assembly 10-3 is positioned in the right part of the cutter mounting groove 1-1 at the moment. Then the pressing seat 2 is rotated by hand to close the pressing seat 2 and the hitching leg fixing seat 1, when the guide arc surface 2-31 of the connection limiting part 2-3 of the pressing seat 2 is contacted (tangent) with the guide surface 3-11 of the bolt 3-1 of the locking device 3, the bolt 3-1 moves forward under the extrusion action of the pressing seat 2, when the guide arc surface 2-31 of the connection limiting part 2-3 of the pressing seat 2 is separated from the guide surface 3-11 of the bolt 3-1 of the locking device 3, the bolt 3-1 moves backward under the action of the reset spring 3-3 to the lower part of the connection limiting part 2-3 of the pressing seat 2, thereby the connection limiting part 2-3 of the pressing seat 2 is limited and fixed, the pressing seat 2 and the hitching leg fixing seat 1 are kept in a closed state, at the moment, the axial limiting part 2-2 of the pressing seat 2 is positioned in the left part of the cutter mounting groove 1-1, the cutter assembly 10-3 can not move leftwards, and the connection reliability of the cutter assembly 10-3 and the gearbox 10-2 is ensured. When the cutter assembly 10-3 needs to be replaced, the bolt 3-1 is pulled forwards by only one hand, when the bolt 3-1 moves forwards and is completely positioned below the mounting part 1-3 of the hitching leg fixing seat 1, the bolt 3-1 is separated from the connection limiting part 2-3 of the pressing seat 2, the pressing seat 2 rotates to be opened under the action of the torsion spring 4, then the cutter assembly 10-3 is horizontally moved leftwards, and the cutter assembly 10-3 is detached from the gearbox 10-2.

The above embodiments are provided for illustrative purposes only and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and in the course of practical application, can make corresponding modifications according to the above embodiments, and therefore all equivalent technical solutions should fall within the scope of protection of the present invention.