阅读说明：本技术 一种拖拉机轮胎压实秸秆后的秸秆挑拨装置 (Straw picking device for tractor tire after straw compaction ) 是由 何进 刘鹏 李洪文 王庆杰 卢彩云 王晓燕 娄尚易 张振国 林涵 王春雷 于 2020-07-16 设计创作，主要内容包括：本发明涉及一种拖拉机轮胎压实秸秆后的秸秆挑拨装置,设置在拖拉机后车轮与秸秆还田机之间,多个秸秆挑拨装置与拖拉机车辙对应地安装在秸秆还田机的还田机壳的前端面上；所述秸秆挑拨装置包括固定方钢、“U”形卡、固定板、弹簧螺纹压杆、螺纹圆盘、支撑板、转动销、拨动板、弹簧压块、弹簧和螺纹压块。本发明的具有多种调整拨动板倾角的方式,操作简单方便；还田作业时,秸秆挑拨装置遇到坚硬石块时,可通过压缩弹簧,保证拨动板顺利通过；当离开坚硬石块时,弹簧将拨动板复位,可有效保证秸秆挑拨装置的作业效果和寿命；两个拨动板之间的夹角可根据田间作业环境进行调整,以提高秸秆挑拨作业质量。(The invention relates to a straw picking device for a tractor tire after straw compaction, which is arranged between a rear wheel of the tractor and a straw returning machine, wherein a plurality of straw picking devices are arranged on the front end surface of the returning machine shell of the straw returning machine corresponding to tractor tracks; the straw picking device comprises fixed square steel, a U-shaped clamp, a fixed plate, a spring thread pressure lever, a thread disc, a supporting plate, a rotating pin, a picking plate, a spring pressing block, a spring and a thread pressing block. The invention has various ways of adjusting the inclination angle of the poking plate, and the operation is simple and convenient; when returning to the field, the straw poking device can compress the spring when encountering hard stones, so as to ensure that the poking plate smoothly passes through; when the straw picking device leaves the hard stone, the spring resets the poking plate, so that the operation effect and the service life of the straw picking device can be effectively ensured; the included angle between the two poking plates can be adjusted according to the field operation environment so as to improve the straw poking operation quality.)

1. A straw picking device for a tractor tire after straw compaction is arranged between a rear wheel of the tractor and a straw returning machine and is characterized in that a plurality of straw picking devices (3) are correspondingly arranged on the front end surface of a returning machine shell (2) of the straw returning machine with a tractor track;

the straw picking device (3) comprises fixed square steel (301), a U-shaped clamp (302), a fixed plate (303), a spring threaded pressure lever (305), a threaded disc (306), a supporting plate (307), a rotating pin (308), a picking plate (309), a spring pressing block (310), a spring (311) and a threaded pressing block (312);

the fixed square steel (301) comprises rounded square steel (3012) and a fixed inclined plate (3011) vertically fixedly connected with the middle part of the rounded square steel (3012), and the fixed inclined plate (3011) is horizontally and fixedly connected to the returning machine shell (2);

a plurality of fixing plate holes (3032) for connecting the U-shaped card (302) are formed in the fixing plate main body (3031) of the fixing plate (303); the fixing plate (303) is fixed on the fixing square steel (301) through a U-shaped clamp (302) and a fastening nut (304);

the supporting plate (307) comprises a horizontally arranged supporting plate main body (3071), a small supporting plate mounting ring (3073), a large supporting plate mounting ring (3074) and an inclined supporting plate hole (3076), wherein the small supporting plate mounting ring, the large supporting plate mounting ring and the inclined supporting plate hole are arranged on the supporting plate main body (3071);

the rear end of the support plate main body (3071) is vertically and fixedly connected to the middle of the front end face of the fixing plate main body (3031), a plurality of pairs of support plate inclined holes (3076) are formed in the support plate main body (3071) at equal intervals along the operation direction in a manner of being high at the rear and low at the front, a large support plate mounting ring (3074) and two small support plate mounting rings (3073) located on two sides of the large support plate mounting ring (3074) are fixedly connected to the front end of the support plate main body (3071), and the large support plate mounting ring (3074) is respectively spaced from the two small support plate mounting rings (3073);

the poking plate (309) comprises a poking plate main body (3092) and a poking plate ring (3091) fixedly connected to the top end of the poking plate main body (3092), and a poking plate sliding groove (3093) is formed in the poking plate main body (3092) along the length direction of the poking plate main body; the poking plate rings (3091) of the two poking plates (309) are respectively positioned in the interval between the large mounting ring (3074) of the supporting plate and the small mounting rings (3073) of the two supporting plates and are rotationally connected with the supporting plate main body (3071) through the rotating pin (308);

the spring threaded compression bar (305) comprises a cross-shaped hanging joint (3051) and a spring threaded rod (3052), wherein the cross-shaped hanging joint (3051) comprises a horizontal rod and an axle side rod which are vertically and fixedly connected with each other; the bottom end of the spring threaded rod (3052) is vertically and fixedly connected with the cross-shaped connection part of the horizontal rod and the shaft side rod;

spring threaded rods (3052) of the two spring threaded compression rods (305) respectively penetrate through a pair of support plate inclined holes (3076) in a support plate main body (3071), the bottom end of each spring threaded rod (3052) is positioned in a poking plate sliding groove (3093) of one poking plate (309), meanwhile, one end of a shaft side rod of the cross hanging joint (3051) is also positioned in the poking plate sliding groove (3093), and a horizontal rod of the cross hanging joint (3051) is in contact with the front end face of the poking plate (309);

the top end of each spring threaded rod (3052) is provided with a threaded disc (306);

a spring (311) is sleeved on the part, located between the support plate main body (3071) and the poking plate main body (3092), of each spring threaded rod (3052); the top end of the spring (311) is provided with a threaded pressing block (312) in threaded connection with the spring threaded rod (3052), the bottom end of the spring (311) is provided with a spring pressing block (310) which can be sleeved on the spring threaded rod (3052) in a free sliding mode, and the spring pressing block (310) is in contact with the rear end face of the poking plate (309).

2. The straw picking device according to claim 1, wherein one end of the fixed inclined plate (3011) has an inclination angle which is the same as the inclination angle of the returning housing (2), so that the fixed inclined plate (3011) can be horizontally fixed on the returning housing (2); the edge of the rear end face of the rounded square steel (3012) is rounded, so that the card is matched with the U-shaped card (302) better.

3. The straw plucking device according to claim 1, wherein the fixed plate main body (3031) is provided with 8 fixed plate holes (3032), the 8 fixed plate holes (3032) are divided into two vertical columns which are symmetrically distributed left and right, and each vertical column comprises 4 fixed plate holes (3032) which are distributed at equal intervals in the vertical direction.

4. The straw plucking apparatus as claimed in claim 1, wherein the angle between the axis of the inclined hole (3076) of the support plate and the horizontal plane is 15-60 °.

5. The straw plucking device according to claim 1, wherein a supporting plate boss (3072) is correspondingly arranged on each supporting plate inclined hole (3076) on the upper end surface of the supporting plate main body (3071), the supporting plate boss (3072) is provided with a supporting plate boss hole (3075), the axis of the supporting plate boss hole (3075) coincides with the axis of the supporting plate inclined hole (3076), and the diameter of the supporting plate boss hole (3075) is larger than that of the supporting plate inclined hole (3076).

6. The straw plucking device according to claim 1, wherein a notch is formed at the bottom end of the plucking plate body (3092), and the notch is rounded.

7. The straw plucking device as claimed in claim 1, wherein the width of the plucking plate sliding groove (3093) is larger than the diameter of the spring threaded rod (3052); the diameter of the spring threaded rod (3052) is smaller than the diameters of the supporting plate boss hole (3075) and the supporting plate inclined hole (3076).

8. The straw plucking device as claimed in claim 1, wherein when the rut of the rear wheel of the tractor can cover the rut of the front wheel of the tractor, the symmetrical surface of the straw plucking device (3) is coincident with the symmetrical surface of the rear wheel of the tractor; when the rear wheel rut of the tractor can not cover the front wheel rut of the tractor and the front wheel rut is overlapped with the rear wheel rut, the symmetrical surface of the straw plucking device (3) is overlapped with the symmetrical surface between the rear wheel rut of the tractor and the front wheel rut of the tractor; when the front wheel rut and the rear wheel rut do not overlap, a straw picking device (3) needs to be installed right behind the front wheel and the rear wheel respectively, and the symmetry planes of the straw picking device (3) coincide with the symmetry planes of the front wheel and the rear wheel respectively.

9. The straw plucking device as claimed in claim 1, wherein the number of straw plucking devices (3) is determined according to the rut area of the tractor wheel, i.e. the working area of the straw plucking device (3) is greater than or equal to the rut area of the tractor wheel.

10. The straw plucking device according to claim 9, wherein the planes of the plucking plate bodies (3092) of the two plucking plates (309) in the straw plucking device (3) have an included angle therebetween, and the included angle ranges from 5 ° to 40 °.

Technical Field

The invention relates to a straw picking device for a tractor tire after straw compaction, and belongs to the technical field of agricultural machinery.

Background

When the straw is smashed and returned to the field operation, the straw smashing and returning machine is hung at the rear of the tractor, the tractor tire can compact the straw on the ground surface, the straw smashing and returning machine cannot effectively pick up the straw compacted by the tractor tire, the straw pick-up rate is reduced, and the straw smashing quality is further reduced. A common response is to use a longer shredding knife at the tractor tire press. But when the straw is returned to the field, the longer crushing knife can not be adjusted according to the field operation condition; the longer crushing knife rotates at a high speed, hard stones in the field are easy to hit, safety accidents are easy to happen, and life safety of a manipulator is endangered; the field operation environment is complicated, and the longer crushing cutter can not accurately determine the working radius, so that the longer crushing cutter is easy to cut soil during operation, the vibration of the machine and the energy consumption of operation are increased, the operation quality is reduced, and the service life of the machine is prolonged.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide a straw picking device for a tractor tire after straw compaction, which can pick the straw after the tractor tire compaction, thereby improving the straw picking efficiency and the crushing quality.

In order to achieve the purpose, the invention provides the following technical scheme:

a straw picking device for a tractor tire after straw compaction is arranged between a tractor rear wheel and a straw returning machine and is characterized in that a plurality of straw picking devices 3 are correspondingly arranged on the front end face of a returning machine shell 2 of the straw returning machine with a tractor track.

The straw picking device 3 comprises a fixed square steel 301, a U-shaped clamp 302, a fixed plate 303, a spring threaded pressure lever 305, a threaded disc 306, a supporting plate 307, a rotating pin 308, a picking plate 309, a spring pressing block 310, a spring 311 and a threaded pressing block 312.

The fixed square steel 301 comprises a rounded square steel 3012 and a fixed inclined plate 3011 vertically fixedly connected with the middle of the rounded square steel 3012, and the fixed inclined plate 3011 is horizontally and fixedly connected to the returning casing 2.

A plurality of fixing plate holes 3032 for connecting the U-shaped clamp 302 are arranged on a fixing plate main body 3031 of the fixing plate 303; the fixing plate 303 is fixed on the fixing square steel 301 through a U-shaped clamp 302 and a fastening nut 304.

The support plate 307 includes a horizontally disposed support plate main body 3071, and a support plate small mounting ring 3073, a support plate large mounting ring 3074 and a support plate inclined hole 3076 which are disposed on the support plate main body 3071.

The rear end of the support plate main body 3071 is vertically and fixedly connected to the middle of the front end face of the fixing plate main body 3031, a plurality of pairs of support plate inclined holes 3076 are obliquely arranged on the support plate main body 3071 at equal intervals along the operation direction, the rear part is higher than the front part, the front end of the support plate main body 3071 is fixedly connected with a large support plate mounting ring 3074 and two small support plate mounting rings 3073 positioned at two sides of the large support plate mounting ring 3074, and the large support plate mounting ring 3074 is respectively spaced from the two small support plate mounting rings 3073 by a certain distance.

The poking plate 309 comprises a poking plate main body 3092 and a poking plate ring 3091 fixedly connected to the top end of the poking plate main body 3092, and a poking plate sliding groove 3093 is formed in the poking plate main body 3092 along the length direction of the poking plate main body; the striking plate rings 3091 of the two striking plates 309 are respectively located in the space between the support plate large mounting ring 3074 and the two support plate small mounting rings 3073, and are rotatably connected with the support plate main body 3071 by the rotating pins 308.

The spring thread compression bar 305 comprises a cross-shaped hanging joint 3051 and a spring thread rod 3052, wherein the cross-shaped hanging joint 3051 comprises a horizontal rod and an axle side rod which are vertically and fixedly connected with each other; the bottom end of the spring threaded rod 3052 is vertically and fixedly connected to the cross-shaped connection part of the horizontal rod and the shaft side rod.

The spring threaded rods 3052 of the two spring threaded compression rods 305 respectively penetrate through the pair of supporting plate inclined holes 3076 on the supporting plate main body 3071, the bottom end of each spring threaded rod 3052 is positioned in the poking plate sliding groove 3093 of one poking plate 309, one end of the shaft side rod of the cross hanging joint 3051 is also positioned in the poking plate sliding groove 3093, and the horizontal rod of the cross hanging joint 3051 is in contact with the front end face of the poking plate 309.

The top end of each spring threaded rod 3052 is provided with a threaded disk 306.

A spring 311 is sleeved on the part of each spring threaded rod 3052, which is positioned between the support plate main body 3071 and the toggle plate main body 3092; the top end of the spring 311 is provided with a threaded pressing block 312 in threaded connection with the spring threaded rod 3052, the bottom end is provided with a spring pressing block 310 which is sleeved on the spring threaded rod 3052 in a free sliding mode, and the spring pressing block 310 is in contact with the rear end face of the poking plate 309.

One end of the fixed inclined plate 3011 has an inclination angle which is the same as the inclination angle of the returning housing 2, so that the fixed inclined plate 3011 can be horizontally and fixedly connected to the returning housing 2; the edge of the rear end face of the rounded square steel 3012 is rounded to make it more compatible with the "U" shaped card 302.

There are 8 fixed plate holes 3032 on fixed plate main part 3031, and 8 fixed plate holes 3032 divide equally into two vertical columns that bilateral symmetry distributes, and every vertical column includes 4 fixed plate holes 3032 along the equidistant distribution of vertical direction.

The angle between the axis of the support plate bore 3076 and the horizontal is 15-60 deg..

A supporting plate boss 3072 is correspondingly arranged on each supporting plate inclined hole 3076 on the upper end face of the supporting plate main body 3071, the supporting plate boss 3072 is provided with a supporting plate boss hole 3075, the axis of the supporting plate boss hole 3075 is overlapped with the axis of the supporting plate inclined hole 3076, and the diameter of the supporting plate boss hole 3075 is larger than that of the supporting plate inclined hole 3076.

The bottom end of the toggle plate main body 3092 is provided with a notch, and the notch is provided with a round angle.

The width of the poking plate sliding groove 3093 is larger than the diameter of the spring threaded rod 3052; the diameter of the spring threaded rod 3052 is smaller than the diameters of the support plate boss hole 3075 and the support plate inclined hole 3076.

When the rear wheel rut of the tractor can cover the front wheel rut of the tractor, the symmetrical surface of the straw plucking device 3 is superposed with the symmetrical surface of the rear wheel of the tractor; when the rear wheel rut of the tractor can not cover the front wheel rut of the tractor and the front wheel rut is overlapped with the rear wheel rut, the symmetrical surface of the straw plucking device 3 is overlapped with the symmetrical surface between the rear wheel rut of the tractor and the front wheel rut of the tractor; when there is not overlapping in front wheel rut and rear wheel rut, then need install a straw right the back of front wheel and rear wheel respectively and dial device 3, and the plane of symmetry of straw dial device 3 coincides in the plane of symmetry of front wheel and rear wheel respectively.

The number of the straw picking devices 3 is determined according to the track area of the tractor wheel, namely the working area of the straw picking devices 3 is larger than or equal to the track area of the tractor wheel.

An included angle is formed between the planes of the poking plate main bodies 3092 of the two poking plates 309 in the straw poking device 3, and the included angle ranges from 5 degrees to 40 degrees.

Compared with the prior art, the invention has the beneficial effects that:

1. a straw picking device is additionally arranged between the tractor wheels and the straw returning machine, so that the straw returning machine can effectively pick up the ground surface pressed by the tractor wheels, and the straw returning operation quality is improved;

2. the straw picking device has various modes of adjusting the inclination angle of the picking plate, and is simple and convenient to operate;

3. when returning to the field, the straw poking device can compress the spring when encountering hard stones, so as to ensure that the poking plate smoothly passes through; when the straw picking device leaves the hard stone, the spring resets the poking plate, so that the operation effect and the service life of the straw picking device can be effectively ensured;

4. the straw picking device adjusts the relative position of the straw picking device relative to the rear wheel of the tractor by adjusting the position of the U-shaped clamp relative to the fixed inclined plate; the relative height of the straw picking and poking device relative to the ground is adjusted by adjusting the mounting position of the U-shaped clamp on the hole of the fixing plate, so that the straw picking and poking device is suitable for various operating environments;

5. the included angle between the two shifting plates in the straw picking device can be adjusted according to the field operation environment so as to improve the straw picking operation quality;

6. the pre-tightening force of the spring in the straw plucking device has various adjusting methods, and the operation is simple and convenient.

Drawings

FIG. 1 is a schematic structural view of the straw picking device of the present invention disposed on a returning housing 2 of a straw returning machine;

FIG. 2 is a schematic structural view of the straw plucking apparatus of the present invention;

FIG. 3 is a schematic structural diagram of a fixed square steel;

FIG. 4 is a schematic structural view of the fixing plate and the supporting plate;

FIG. 5 is a schematic cross-sectional view of the fixing plate and the supporting plate;

FIG. 6 is a schematic view of the structure of the toggle plate;

FIG. 7 is a schematic structural view of a spring threaded strut;

FIG. 8 is a schematic structural view of a threaded disk;

FIG. 9 is a schematic structural diagram of a spring pressing block;

FIG. 10 is a schematic structural diagram of a threaded compact.

Wherein the reference numerals are:

1 three-point suspension device 2 returning machine shell

3 fixed square steel of straw picking device 301

3011 fixed sloping plate 3012 round corner square steel

302 'U' shaped card 303 fixing plate

3031 fixing plate main body 3032 fixing plate hole

304 fastening nut 305 spring thread pressure lever

3051 Cross-shaped hanging joint 3052 spring threaded rod

306 threaded disc 3061 threaded disc body

3062 threaded disc threaded hole 307 backing plate

3071 the support plate body 3072 support plate boss

3073 supporting plate small mounting ring 3074 supporting plate big mounting ring

3075 supporting plate boss hole 3076 supporting plate inclined hole

308 rotating pin 309 toggle plate

3091 the ring 3092 of the striking plate body

3093 spring pressing block of sliding slot 310 of shifting plate

3101 the spring press block body 3102 the spring press block through hole

311 spring 312 screw press block

3121 threaded press block main body 3122 threaded press block threaded hole

Detailed Description

As shown in figure 1, the straw picking device for the tractor with the tire compacted with the straw is arranged between the rear wheel of the tractor and a straw returning machine. A plurality of straw plucking devices 3 are installed on the front end surface (end surface on the side facing the tractor) of the field returning housing 2 corresponding to the tractor ruts. The returning machine shell 2 is provided with a three-point suspension device 1 which is articulated with a tractor.

As shown in FIG. 2, the straw plucking device 3 comprises a fixed square steel 301, a U-shaped clamp 302, a fixed plate 303, a spring threaded compression bar 305, a threaded disc 306, a supporting plate 307, a rotating pin 308, a plucking plate 309, a spring pressing block 310, a spring 311 and a threaded pressing block 312.

As shown in fig. 3, the fixed square steel 301 includes a rounded square steel 3012 and a fixed inclined plate 3011 vertically fixed to the middle of the rounded square steel 3012, wherein one end of the fixed inclined plate 3011 has an inclination angle which is the same as the inclination angle of the returning-to-field housing 2, so that the fixed inclined plate 3011 can be horizontally fixed to the returning-to-field housing 2; the edge of the rear end face of the rounded square steel 3012 is rounded to make it more compatible with the "U" shaped card 302.

As shown in fig. 4, a plurality of fixing plate holes 3032 for connecting the U-shaped card 302 are provided on the fixing plate main body 3031 of the fixing plate 303. Preferably, the fixing plate main body 3031 has 8 fixing plate holes 3032, and the 8 fixing plate holes 3032 are equally divided into two vertical columns symmetrically distributed left and right, and each vertical column includes 4 fixing plate holes 3032 distributed at equal intervals in the vertical direction. The fixing plate 303 is fixed on the fixing square steel 301 through two U-shaped clamps 302 and 4 fastening nuts 304, and then the straw picking device 3 is fixed on the returning machine shell 2 through the fixing square steel 301. Meanwhile, the relative position of the straw picking device 3 and the tractor tire in the horizontal direction is adjusted by moving the relative position of the fixed plate 303 and the fixed square steel 301 in the horizontal direction; the U-shaped clamp 302 is arranged on different fixing plate holes 3032, so that the height of the straw picking device 3 relative to the ground can be adjusted, and the straw picking device is suitable for different ground surface straw covering conditions.

As shown in fig. 4 and 5, the support plate 307 includes a horizontally disposed support plate main body 3071, and a support plate small mounting ring 3073, a support plate large mounting ring 3074 and a support plate inclined hole 3076 which are disposed on the support plate main body 3071.

The rear end of the support plate main body 3071 is vertically and fixedly connected to the middle of the front end face of the fixing plate main body 3031, a plurality of pairs of support plate inclined holes 3076 are formed in the support plate main body 3071 at equal intervals along the operation direction in a manner of being high at the rear and low at the front, and an included angle between the axis of the support plate inclined holes 3076 and the horizontal plane is 15-60 degrees. A large mounting ring 3074 and two small mounting rings 3073 located at two sides of the large mounting ring 3074 are fixedly connected to the front end of the supporting plate main body 3071, and the large mounting ring 3074 is spaced apart from the small mounting rings 3073 by a certain distance to accommodate the ring 3091 of the toggling plate 309.

Preferably, each support plate inclined hole 3076 on the upper end surface of the support plate main body 3071 is correspondingly provided with a support plate boss 3072, the support plate boss 3072 has a support plate boss hole 3075, the axis of the support plate boss hole 3075 coincides with the axis of the support plate inclined hole 3076, and the diameter of the support plate boss hole 3075 is larger than that of the support plate inclined hole 3076.

As shown in fig. 6, the striking plate 309 includes a striking plate body 3092 and a striking plate ring 3091 fixedly connected to the top end of the striking plate body 3092, the bottom end of the striking plate body 3092 is provided with a notch, and the notch is provided with a round angle, so as to facilitate the striking plate body 3092 to profile a gully formed by the pressure of the tractor wheel; the toggle plate main body 3092 is provided with a toggle plate slide groove 3093 along the longitudinal direction thereof. The striking plate rings 3091 of the two striking plates 309 are respectively located in the space between the support plate large mounting ring 3074 and the two support plate small mounting rings 3073, and are rotatably connected with the support plate main body 3071 by the rotating pins 308.

As shown in fig. 7, the spring threaded strut 305 includes a cross-shaped joint 3051 and a spring threaded rod 3052, wherein the cross-shaped joint 3051 includes a horizontal rod and an axial rod which are vertically fixed to each other; the bottom end of the spring threaded rod 3052 is vertically and fixedly connected to the cross-shaped connection part of the horizontal rod and the shaft side rod.

The spring threaded rods 3052 of the two spring threaded compression rods 305 respectively penetrate through the pair of supporting plate inclined holes 3076 and the supporting plate boss holes 3075 in the supporting plate main body 3071, the bottom end of each spring threaded rod 3052 is located in the poking plate sliding groove 3093 of one poking plate 309, meanwhile, one end of the shaft side rod of the cross hanging joint 3051 is also located in the poking plate sliding groove 3093, and the horizontal rod of the cross hanging joint 3051 is in contact with the front end face of the poking plate 309. The spring threaded strut 305 is mounted in a different pair of support plate bores 3076 to adjust the angle between the toggle plate 309 and the support plate body 3071.

The top end of each spring threaded rod 3052 is provided with a threaded disc 306, and the spring threaded compression bar 305 is fixed on the support plate boss 3072; the amount of expansion and contraction of the spring threaded rod 3052 relative to the support plate boss 3072 can be adjusted by rotating the threaded disk 306, thereby adjusting the tilt angle of the toggle plate 309.

A spring 311 is sleeved on the part of each spring threaded rod 3052, which is positioned between the support plate main body 3071 and the toggle plate main body 3092; the top end of the spring 311 is provided with a threaded pressing block 312 in threaded connection with the spring threaded rod 3052, the bottom end is provided with a spring pressing block 310 which is sleeved on the spring threaded rod 3052 in a free sliding mode, and the spring pressing block 310 is in contact with the rear end face of the poking plate 309.

When the threaded pressing block 312 is kept still, the threaded disc 306 is rotated clockwise, the spring threaded rod 3052 is driven to move upwards along the poking plate sliding groove 3093, and the length of the spring threaded rod 3052 below the supporting plate main body 3071 is shortened, so that the poking plate main body 3092 is pulled to rotate towards the direction close to the fixing plate 303 through the cross-shaped hanging joint 3051, the position of the poking plate main body 3092 is adjusted, and different ground surface operation environments are adapted; the rotation of the toggle plate main body 3092 further drives the spring pressing block 310 to move upwards, so that the spring 311 is compressed, and the pre-tightening force of the spring 311 is increased; on the contrary, when the threaded disc 306 is rotated counterclockwise, the spring threaded rod 3052 is driven to move downward along the toggle plate sliding groove 3093, and the length of the spring threaded rod 3052 at the bottom of the support plate main body 3071 is increased, so that the spring pressing block 310 pushes the toggle plate main body 3092 to rotate in a direction away from the fixed plate 303 under the action of the pre-tightening force of the spring 311.

When the poking plate 309 touches a hard stone, the hard stone generates a reaction force on the poking plate 309, and the reaction force is larger than the compression pretightening force of the spring 311, so that the poking plate 309 pushes the spring pressing block 310 to further compress the spring 311, the poking plate 309 smoothly passes through, and the safety and stability of the straw poking device 3 are not damaged; when the striking plate 309 is moved away from the hard stone block, the striking plate 309 returns to its original position due to the compressive pre-load of the spring 311 and continues to operate.

While the threaded disk 306 remains stationary, rotating the threaded press 312 clockwise, the threaded press 312 moves along the spring threaded rod 3052 in a direction away from the support plate body 3071, thereby compressing the spring 311; when the screw weight 312 is rotated counterclockwise, the screw weight 312 moves toward the approaching support plate body 3071 along the spring threaded rod 3052, so that the spring 311 is extended; when the screw press 312 is rotated, the toggle plate 309 does not rotate because the spring screw press rod 305 does not move.

As shown in fig. 8, the threaded disk 306 includes a threaded disk body 3061 and a threaded disk threaded bore 3062, wherein the threaded disk 306 is mounted on the spring threaded shank 3052 by the threaded disk threaded bore 3062 and is in contact with the support plate boss 3072.

As shown in fig. 9, the spring pressing piece 310 includes a spring pressing piece main body 3101 and a spring pressing piece through hole 3102, wherein the spring pressing piece 310 is mounted on the spring threaded rod 3052 through the spring pressing piece through hole 3102 and is located below the spring 311, and the spring pressing piece 310 is in close contact with the toggling plate 309 by the pressing action of the spring 311.

As shown in fig. 10, the threaded press block 312 includes a threaded press block body 3121 and a threaded press block hole 3122, wherein the threaded press block 312 is mounted on the spring threaded rod 3052 through the threaded press block hole 3122 and contacts the spring 311.

The width of the striking plate sliding groove 3093 is slightly larger than the diameter of the spring threaded rod 3052, so that the spring threaded rod 3052 can smoothly pass through the striking plate sliding groove 3093 and the strength of the striking plate main body 3092 is guaranteed.

The diameter of the spring threaded rod 3052 is smaller than the diameters of the support plate boss hole 3075 and the support plate inclined hole 3076, thereby protecting the threads on the spring threaded rod 3052.

When the rear wheel rut of the tractor can cover the front wheel rut of the tractor, the symmetrical surface of the straw plucking device 3 is coincided with the symmetrical surface of the rear wheel of the tractor; when the rear wheel rut of the tractor can not cover the front wheel rut of the tractor and the front wheel rut is overlapped with the rear wheel rut, the symmetrical surface of the straw plucking device 3 is coincided with the symmetrical surface between the rear wheel rut of the tractor and the front wheel rut of the tractor; when there is no overlap between the front wheel rut and the rear wheel rut, a straw picking device 3 needs to be installed right behind the front wheel and the rear wheel, and the symmetry planes of the straw picking device 3 should coincide with the symmetry planes of the front wheel and the rear wheel respectively.

The number of the straw picking devices 3 is determined according to the rut area of the tractor wheel, namely, the operation area of the straw picking devices 3 is larger than or equal to the rut area of the tractor wheel, and the straws compacted by the tractor wheel are fully stirred.

An included angle is formed between the planes of the poking plate main bodies 3092 of the two poking plates 309 in the straw poking device 3, and the included angle ranges from 5 degrees to 40 degrees. During operation, the front shifting plate 309 firstly shifts the straws to generate initial disturbance to the shifted straws, and then the rear shifting plate shifts the straws for the second time, thereby improving the shifting operation effect.

The working process of the invention is as follows:

the invention discloses a compacted straw picking device 3 of a tractor, which is arranged on a returning machine shell 2 and is positioned behind the rear wheel of the tractor. Before returning the straws to the field, according to the covering amount of the straws on the ground surface, the relative positions of the spring threaded rod 3052, the threaded disc 306 and the threaded pressing block 312 are adjusted to obtain the compression pretightening force of the spring 311, and the poking plate 309 is enabled to be in a proper operation position; according to the model of the tractor tyre, the position of the straw picking device 3 relative to the rear wheel of the tractor is adjusted. When the straw is returned to the field, the front wheels and the rear wheels of the tractor can roll the straw on the ground surface, so that the straw on the ground surface sinks. When the striking plate 309 encounters the straw that is sinking, the straw will react against the striking plate 309, causing the striking plate 309 to tend to rotate toward the support plate body 3071. However, due to the existence of the compression pretightening force of the spring 311, the poking plate 309 cannot rotate, so that straws are poked, and sunken straws become fluffy or leave a tractor wheel compaction area, so that the sunken straws can be picked up and smashed by the straw returning machine; when the poking plate 309 touches a hard stone, the hard stone generates a reaction force on the poking plate 309, and the reaction force is larger than the compression pretightening force of the spring 311, so that the poking plate 309 pushes the spring pressing block 310 to further compress the spring 311, the poking plate 309 smoothly passes through, and the safety and stability of the straw poking device 3 are not damaged; when the striking plate 309 is moved away from the hard stone block, the striking plate 309 returns to its original position due to the compressive pre-load of the spring 311 and continues to operate.

Finally, it should be pointed out that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.