CN105659994B - A pneumatic corn precision no-tillage seeder - Google Patents

Abstract

The invention belongs to agricultural machinery technological field, it is related to a kind of Pneumatic type precision corn amount no-tillage seeding machine, including blower fan (1), blower rack (2), fertilizer box (3), three-point hitch (4), active anti-jamming mechanism (7), implement porter (8), parallel―ordinal shift sowing mechanism (9), blast distribution pipe (5) and depth-limiting mechanism (6)；Parallel―ordinal shift sowing mechanism (9) also includes extension spring regulation ring (29), block (37), parallel―ordinal shift lower limiting mechanism (38)；Depth-limiting mechanism (6) includes depth-limiting mechanism installing plate (46), depth-limiting mechanism rotating shaft (47), spring steady pin (48), regulation spring (49), depth-limiting mechanism regulation handle (50), limiting plate (51), gauge wheel (52), the first depth-limiting mechanism Bevel Gear Transmission box (17) and the second depth-limiting mechanism Bevel Gear Transmission box (56).The seeder integrates active anti-jamming mechanism, Pneumatic seeding apparatus, sowing profiling.

Description

A pneumatic corn precision no-tillage seeder

technical field

The invention belongs to the technical field of agricultural machinery, and in particular relates to a pneumatic corn precision no-tillage seeder.

Background technique

As the main agricultural equipment now, the seeder has a major impact on the current agricultural production. Corn no-tillage sowing in the Huang-Huai-Hai area has problems such as high straw toughness, easy congestion, unstable sowing depth, and inconvenient adjustment of the tension spring of the traditional parallel four-bar linkage mechanism. At the same time, the parallel four-bar linkage mechanism has no active lower limit function during transportation. If the distance between the road surfaces is too small, the bumps and undulations of the road surface will easily cause the seeder to collide with the road surface and cause damage.

In addition, in the prior art, the airflow distribution of pneumatic seeders mostly adopts equal-diameter air ducts, which may easily cause the problem of reseeding at high pressure and missed seeding at low pressure.

At present, the main domestic seeders use mechanical seed metering devices, which have low seeding speed and poor seeding accuracy. Seeder profiling mechanism CN103688627A adopts cross-axis profiling, a single-body imitation rice and wheat double-purpose precision hole planter CN104067706A, a profiling sowing device CN204907056U, a frame-type parallel four-bar profiling mechanism CN86207593U, a seeder profiling mechanism CN105210488A all adopt parallel four-bar linkage mechanism, but none of them gives a reasonable solution to the problem of spring adjustment and lower limit.

Contents of the invention

Aiming at the above problems, the present invention provides a pneumatic corn precision no-tillage seeder integrating an active anti-blocking mechanism, a pneumatic seed metering device and a sowing profiling.

To achieve the above object, the technical scheme of the present invention is as follows:

A pneumatic precision no-tillage seeder for corn, comprising a fan 1, a fan frame 2, a fertilizer box 3, a three-point suspension mechanism 4, an active anti-blocking mechanism 7, a universal frame 8 and a parallel four-bar linkage seeding mechanism 9;

The lower end of the fertilizer box 3 is provided with a fertilizer box transmission shaft 61, and the fertilizer box driven sprocket 62 is arranged on the fertilizer box transmission shaft 61;

Described parallel four-bar link sowing mechanism 9 comprises parallel four-bar link mechanism 26, extension spring mounting pin 27, seed meter 36, first sprocket wheel 13 of parallel four-bar link sowing mechanism, wherein, parallel four-bar link mechanism 26 comprises Upper connecting rod 261, front connecting rod 262, lower connecting rod 263 and rear connecting rod 264, the first sprocket wheel 13 of parallel four-bar linkage sowing mechanism of a plurality of parallel four-bar linkage sowing mechanisms 9 passes through the same cylinder transmission shaft 59, and It is fixedly connected with the cylindrical transmission shaft 59, and the cylindrical transmission shaft driven sprocket 66 is arranged on the cylindrical transmission shaft 59;

The planter also includes a wind pressure distribution pipe 5 and a depth limiting mechanism 6;

The air outlet of the fan 1 communicates with the seed meter 36 of the parallel four-bar linkage seeding mechanism 9 through the air pressure distribution pipe 5. The air pressure distribution pipe 5 includes a middle part and two end parts, wherein the diameter r of the middle part is less than two the diameter R of the end portion;

The parallel four-bar linkage seeding mechanism 9 also includes a tension spring adjustment ring 29, a block 37, and a lower parallel four-bar linkage limit mechanism 38;

Described extension spring adjusting ring 29 comprises operating rod 11, adjusting ring 39 and support rod 40, operating rod 11 is fixed on one side of adjusting ring 39, and supporting rod 40 is fixed on the adjusting ring 39 on the opposite side with operating rod 11, The tension spring mounting pin 27 passes through the adjustment ring 39, and the support rod 40 is placed on the upper surface of the upper link 261 of the parallelogram mechanism 26;

The lower limiting mechanism 38 of the parallel four-bar linkage comprises a bearing pin 41, a gasket 42, a stage clip 43, a lower limiting mechanism rotating shaft 44, a limiting member 45 and a lower limiting mechanism adjusting handle 12, wherein the lower limiting mechanism rotating shaft 44 passes through The upper connecting rod 261 is hinged with the upper connecting rod 261. The compression spring 43 and the gasket 42 are successively set on the rotating shaft 44 of the lower limiting mechanism, and are located on the inner side of the upper connecting rod 261. The pin shaft 41 is inserted into the end of the rotating shaft 44 of the lower limiting mechanism. The small hole, the limiting part 45 includes a limiting part 64 and a connecting part 65, wherein the upper end of the connecting part 65 is fixedly connected with the rotating shaft 44 of the lower limiting mechanism, and the limiting part 64 is located below the upper connecting rod 261; the upper connecting rod 261 The outer side is fixedly connected with a block 37, and the block 37 is against the connecting portion 65, so that the limiting portion 64 is against the angle between the upper link 261 and the front link 262;

Described depth-limiting mechanism 6 comprises depth-limiting mechanism mounting plate 46, depth-limiting mechanism rotating shaft 47, spring fixed pin 48, adjusting spring 49, depth-limiting mechanism adjusting handle 50, limit plate 51, depth-limiting wheel 52, depth-limiting mechanism 5th One bevel gear transmission box 17 and the second bevel gear transmission box 56 of the depth-limiting mechanism, wherein the first end of the depth-limiting mechanism mounting plate 46 is fixed on the universal frame 8, and its second end is close to the depth-limiting wheel 52, which is an arc A plurality of adjustment holes 53 are arranged along the second end, and the corresponding two adjustment holes 53 of the left and right depth-limiting mechanism mounting plates 46 form a group, and each group of adjustment holes 53 has a different height from the ground The limiting plate 51 is arranged on the outside of the depth-limiting mechanism mounting plate 46, the depth-limiting wheel 52 is located between the left and right two limiting plates 51, and one end of the limiting plate 51 and the depth-limiting mechanism mounting plate 46 pass through the depth-limiting mechanism rotating shaft 47 Hinged, the other end of the limiting plate 51 is connected with the rotating shaft of the depth-limiting wheel 52, and the limiting plate 51 is provided with a slot corresponding to the second end of the depth-limiting mechanism mounting plate 46 in position; the spring fixing pin 48 is fixed Between the two depth-limiting mechanism mounting plates 46 on the left and right, one end of the adjustment spring 49 is hooked on the spring fixing pin 48, and the other end is hooked on the depth-limiting mechanism adjusting handle 50, and the two ends of the depth-limiting mechanism adjusting handle 50 are respectively Snap into a group of adjustment holes 53 of the left and right depth-limiting mechanism mounting plates 46 and further insert into the elongated holes of the limiting plate 51;

The two ends of described spacer plate 51 are respectively provided with the first bevel gear transmission box 17 of depth-limiting mechanism and the second bevel gear transmission box 56 of depth-limiting mechanism, and the input shaft of the first bevel gear transmission box 17 of depth-limiting mechanism and the depth-limiting wheel The wheel shaft of 52 is fixedly connected, the output shaft of the first bevel gear transmission box 17 of the depth-limiting mechanism is connected with the input shaft of the second bevel gear transmission box 56 of the depth-limiting mechanism, and the second bevel gear transmission of the depth-limiting mechanism 6 of a plurality of depth-limiting mechanisms Cassette 56 passes through same hexagonal transmission shaft 60, and is fixedly connected with hexagonal transmission shaft 60, arranges fat box transmission sprocket 57 and cylinder transmission shaft transmission sprocket 58 respectively on the hexagonal transmission shaft 60, and fertilizer box transmission sprocket 57 and fertilizer The fat box driven sprocket 62 on the box drive shaft 61 is connected, and the cylinder drive shaft drive sprocket 58 is connected with the cylinder drive shaft driven sprocket 66 on the cylinder drive shaft 59.

The relationship between the diameter r of the middle part of the air pressure distribution pipe 5 and the diameter R of the two ends of the air pressure distribution pipe 5 is 3r ² =2R ² .

The length L of the middle part of the wind pressure distribution pipe 5 is greater than the length l of the two end parts, and L=2l.

The operating rod 11 is fixed on one side of the adjusting ring 39 along the diameter direction of the adjusting ring 39;

The support rod 40 is perpendicular to the torus formed by the adjustment ring 39 .

The output shaft of the first bevel gear transmission box 17 of the depth-limiting mechanism is connected with the input shaft of the second bevel gear transmission box 56 of the depth-limiting mechanism through an intermediate transmission shaft 55 .

The beneficial effects of the present invention are:

1) The active depth adjustment is adopted to solve the problems of poor adjustment accuracy and inconvenient adjustment of the existing depth adjustment mechanism, and to ensure the consistency of the sowing depth; the independent depth-limiting mechanism 6 can ensure the stable operation of the whole machine, and assist in the adjustment of the sowing depth and fertilization At the same time, the depth-limiting mechanism 6 has a relatively large pressure on the ground surface, and the contact is stable. The depth-limiting mechanism 6 is more stable as a driving wheel than the suppression wheel as a driving wheel, and the slip rate is lower.

2) The adjustment of the parallel four-bar linkage spring is assisted by a circular adjustment ring, which is convenient and labor-saving, and can be completed by hand without tools. Due to the large spring preload, it is difficult to adjust by hand, and generally requires other tools. The function of the adjusting ring is to lift the extension spring mounting pin from the opening slot, and guide it to the adjacent opening slot through the inner circular arc, so as to achieve the purpose of adjustment.

3) The lower limit mechanism 38 of the parallel four-bar linkage adopts an active limit to effectively ensure the height difference between the seeder and the ground during transportation.

4) The air pressure distribution pipe 5 of the seeder adopts a variable diameter design to ensure that the air pressure of each air outlet is consistent, and solve the problem of re-seeding and missed seeding caused by high air pressure at both ends and low air pressure in the middle of the equal-diameter air pressure distribution pipe.

Description of drawings

Fig. 1 is the overall structure schematic diagram of pneumatic type corn precision no-tillage seeder of the present invention;

Fig. 2 is the structural representation of the wind pressure distribution pipe 5 of the pneumatic type corn precision no-tillage seeder of the present invention;

Fig. 3 is a schematic structural view of the active anti-blocking mechanism 7 of the pneumatic type corn precision no-tillage planter of the present invention;

Fig. 4 a is the schematic structural view of the parallel four-bar linkage sowing mechanism 9 of the pneumatic type corn precision no-tillage planter of the present invention;

Fig. 4b is a structural schematic diagram of another angle of the parallel four-bar linkage sowing mechanism 9 of the pneumatic corn precision no-tillage planter of the present invention;

Fig. 5a is a structural schematic diagram of the depth-limiting mechanism 6 of the pneumatic type corn precision no-tillage planter of the present invention;

Fig. 5b is a structural schematic diagram of another angle of the depth-limiting mechanism 6 of the pneumatic corn precision no-tillage planter of the present invention;

Fig. 6 is the schematic structural view of the extension spring adjusting ring 29 of the pneumatic type corn precision no-tillage planter of the present invention;

FIG. 7 is a structural schematic diagram of the lower limit mechanism 38 of the parallel four-bar linkage of the pneumatic corn precision no-tillage planter of the present invention.

Fig. 8a is a schematic diagram of the connection relationship between the parallel four-link lower limit mechanism 38, the upper link 261, the front link 262 and the stopper 37 of the pneumatic corn precision no-tillage planter of the present invention.

Fig. 8b is a schematic diagram of the connection relationship between the parallel four-bar lower limit mechanism 38, the upper link 261 and the front link 262 of the pneumatic corn precision no-tillage planter of the present invention.

Fig. 9 is a schematic structural view of the fertilizer box 3 of the pneumatic corn precision no-tillage seeder of the present invention.

reference sign

1 fan

2 fan racks

3 fat bins

4 three-point suspension mechanism

5 air pressure distribution pipe

6 Depth limit mechanism

7 Active anti-blocking mechanism

8 universal racks

9 Parallel four-bar linkage seeding mechanism

10 Active anti-blocking mechanism bevel gear transmission box connecting plate

11 joystick

12 Lower limit mechanism adjustment handle

13 The first sprocket of the parallel four-bar linkage seeding mechanism

14 The second sprocket of the parallel four-bar linkage seeding mechanism

15 The third sprocket of the parallel four-bar linkage seeding mechanism

16 The fourth sprocket of the parallel four-bar linkage seeding mechanism

17 The first bevel gear transmission box of the depth-limiting mechanism

18 Active anti-blocking mechanism bevel gear transmission box

19 Active anti-blocking mechanism connecting plate

20 Ditching Leg Connection Sleeves

21 ditching legs

22 active anti-blocking roller

23 points grass fence

24 Trench shovel

25 connecting plate of parallel four-bar linkage seeding mechanism

26 parallel four-bar linkage mechanism

261 upper link

262 Front linkage

263 lower link

264 rear link

27 Tension spring mounting pin

28 extension spring

29 tension spring adjusting ring

30 Meter Mounting Plate

31 boxes

32 pressure wheel

33 Roller mounting bracket

34 cover board

35 seed openers

36 seed meter

37 stop

38 Parallel four-bar linkage lower limit mechanism

39 Adjustment ring

40 support rod

41 pin shaft

42 Spacers

43 compression spring

44 Shaft of lower limit mechanism

45 Limiting parts

46 Depth limit mechanism mounting plate

47 Depth limit mechanism rotating shaft

48 Spring retaining pin

49 Adjustment spring

50 Depth limit mechanism adjustment handle

51 limit plate

52 Depth gauge wheel

53 Adjusting hole position

54 Active anti-blocking mechanism sprocket

55 Intermediate drive shaft

56 The second bevel gear transmission box of the depth limit mechanism

57 Fertilizer box drive sprocket

58 Cylindrical drive shaft drive sprocket

59 cylindrical drive shaft

60 hexagon drive shaft

61 Fertilizer box drive shaft

62 Fertilizer box driven sprocket

63 Fertilizer box driving sprocket

64 limit part

65 connection part

66 Cylindrical drive shaft driven sprocket

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a pneumatic corn precision no-tillage seeder includes a fan 1, a fan frame 2, a fertilizer box 3, a three-point suspension mechanism 4, an air pressure distribution pipe 5, a depth limit mechanism 6, an active anti- Blocking mechanism 7, universal frame 8 and parallel four-bar linkage seeding mechanism 9.

The general-purpose frame 8 is a hollow beam, the middle part of the front end of the beam is connected with a three-point suspension mechanism 4, a plurality of active anti-blocking mechanisms 7 are connected under the front end, and a plurality of parallel four-bar linkage seeding mechanisms 9 and depth-limiting mechanisms are connected under the rear end of the beam. 6, and the active anti-blocking mechanism 7 and the parallel four-bar linkage seeding mechanism 9 are arranged in a staggered manner. A plurality of depth-limiting mechanisms 6 are symmetrically arranged, preferably two depth-limiting mechanisms 6, and the two depth-limiting mechanisms 6 are symmetrically arranged inside the first parallel four-bar linkage seeding mechanism 9 on both sides. The blower fan 1 is fixed on the three-point suspension mechanism 4 through the fan frame 2, and the air outlet of the blower fan 1 communicates with the seed meter 36 of the parallel four-bar linkage seeding mechanism 9 through the wind pressure distribution pipe 5 through the pipeline. Fertilizer case 3 is fixed on the universal frame 8. There are preferably two fertilizer boxes 3, located on both sides of the fan 1, respectively.

As shown in Figure 2, the wind pressure distribution pipe 5 includes a middle part and two end parts, wherein the diameter r of the middle part is smaller than the diameter R of the two end parts, preferably, 3r ² =2R ² ; the length L of the middle part It is longer than the length l of the parts at both ends, preferably, L=2l.

As shown in Figure 3, the active anti-blocking mechanism 7 adopts a shovel type ditch opener, including an active anti-blocking mechanism bevel gear transmission box connecting plate 10, an active anti-blocking mechanism bevel gear transmission box 18, and an active anti-blocking mechanism connecting plate 19. Ditching leg connecting sleeve 20, ditching leg 21, active anti-blocking roller 22, grass dividing grid 23, ditching shovel 24 and active anti-blocking mechanism sprocket 54. Wherein, the ditching shovel 24 includes a shovel tip and two side plates arranged at the rear end of the shovel tip, the lower end of the active anti-blocking roller 22 is hinged between the front ends of the two side plates of the ditching shovel 24, and the upper end is connected to the active anti-blocking mechanism. The output shaft of the bevel gear transmission box 18 is fixedly connected. The input shaft of the active anti-blocking mechanism bevel gear transmission box 18 is provided with an active anti-blocking mechanism sprocket 54; the active anti-blocking mechanism bevel gear transmission box 18 is connected with the active anti-blocking mechanism through the active anti-blocking mechanism bevel gear transmission box connecting plate 10 Plate 19 is fixedly connected. The ditching leg 21 is arranged behind the active anti-blocking roller 22, and the lower end of the ditching leg 21 is fixedly connected to the two side plates of the ditching shovel 24, and the upper end is fixedly connected to the connecting sleeve 20 of the ditching leg. The upper end of the ditching leg connecting sleeve 20 is fixedly connected with the connecting plate 19 of the active anti-blocking mechanism. Grass-distributing grid plate 23 is fixedly connected at ditching leg 21 rears. The active anti-blocking mechanism 7 is fixed on the universal frame 8 through the connecting plate 19 of the active anti-blocking mechanism.

As shown in FIG. 9 , the lower end of the fertilizer box 3 is provided with a fertilizer discharge port, and the fertilizer discharge port transports the fertilizer to between the two side plates of the ditching shovel 24 through a hose for fertilization. The lower end of the fertilizer box 3 is provided with a fertilizer box drive shaft 61, and the fertilizer box driven sprocket 62 and the fertilizer box driving sprocket 63 are respectively arranged on the fertilizer box transmission shaft 61, wherein the fertilizer box driving sprocket 63 passes through the chain and the active anti-blocking mechanism The sprocket 54 is connected.

As shown in Figures 4a and 4b, the parallel four-bar linkage sowing mechanism 9 includes a parallel four-bar linkage sowing mechanism connecting plate 25, a parallel four-bar linkage 26, an extension spring mounting pin 27, an extension spring 28, and an extension spring adjustment ring 29. Seed metering device mounting plate 30, seed box 31, suppression wheel 32, suppression wheel mounting frame 33, overburden plate 34, seeding ditch opener 35, seed metering device 36, stopper 37, parallel four linkage lower limit mechanism 38 , the first sprocket wheel 13 of the parallel four-bar linkage seeding mechanism, the second sprocket wheel 14 of the parallel four-bar linkage seeding mechanism, the third sprocket 15 of the parallel four-bar linkage seeding mechanism and the fourth sprocket 16 of the parallel four-bar linkage seeding mechanism, wherein , the parallel four-bar linkage mechanism 26 includes an upper link 261, a front link 262, a lower link 263 and a rear link 264, and the upper link 261, the front link 262, the lower link 263 and the rear link 264 are hinged Together they form a parallel four-bar linkage structure. The upper end of the upper link 261 is provided with a plurality of notch grooves. The two ends of the tension spring mounting pin 27 are snapped into a group of notch grooves corresponding to the two upper connecting rods 261 respectively, and are adjusted between each group of notch grooves. The two ends of the extension spring 28 are respectively hung on the extension spring mounting pin 27 and the lower connecting rod 263 . The connecting plate 25 of the parallel four-bar link sowing mechanism is fixedly connected with the front link 262 of the parallel four-bar link mechanism 26 , and the seed metering device mounting plate 30 is fixedly connected with the rear link 264 of the parallel four-bar link mechanism 26 . The seed box 31 is fixedly connected to the upper end of the seed meter mounting plate 30 , the seed meter 36 is fixedly connected to the lower end of the seed meter mounting plate 30 , and the seed opening of the seed box 31 communicates with the seed inlet of the seed meter 36 . The suppression wheel 32 is fixed on the rear part of the seed meter installation plate 30 by the suppression wheel mounting frame 33, the upper end of the sowing ditch opener 35 is fixed with the seed meter installation plate 30, and the cover plate 34 is fixed on the lower end of the rear part of the sowing ditch opener 35. The seed metering device 36 is a pneumatic seed metering device. The output power of the tractor drive shaft is used to drive the fan 1 to rotate. The fan 1 generates wind pressure, and the air flow is distributed to each seed metering device 36 through the air pressure distribution pipe 5 to complete the seed filling. The pneumatic seed metering device has little damage to seeds, high seed metering accuracy and fast operation speed. The pressing wheel 32 undulates with the ground surface and completes the profiling by the parallel four-bar linkage mechanism 26, which ensures the consistency of the sowing depth.

The first sprocket wheel 13 of the parallel four-bar linkage sowing mechanism is positioned at the junction of the front connecting rod 262 and the lower connecting rod 263, and the second sprocket wheel 14 of the parallel four-bar linkage sowing mechanism and the third sprocket wheel 15 of the parallel four-bar linkage sowing mechanism are located at the bottom The joint of the connecting rod 263 and the rear connecting rod 264, the second sprocket 14 of the parallel four-bar linkage seeding mechanism and the third sprocket 15 of the parallel four-bar linkage seeding mechanism are coaxial and connected, and the fourth sprocket of the parallel four-bar linkage seeding mechanism 16 is fixedly connected with the power input end of the seed meter 36, and between the first sprocket 13 of the parallel four-bar linkage sowing mechanism and the second sprocket 14 of the parallel four-bar linkage sowing mechanism, the third sprocket of the parallel four-bar linkage sowing mechanism All be connected by chain between 15 and the fourth sprocket wheel 16 of parallel four-bar linkage seeding mechanism. The first sprocket wheel 13 of the parallel four-bar linkage sowing mechanism of a plurality of parallel four-bar linkage sowing mechanisms 9 passes through the same cylinder transmission shaft 59, and is fixedly connected with the cylinder transmission shaft 59, and the cylinder transmission shaft driven chain is arranged on the cylinder transmission shaft 59 Wheel 66.

As shown in FIG. 6 , the tension spring adjustment ring 29 includes an operating rod 11 , an adjustment ring 39 and a support rod 40 . The operating rod 11 is fixed on one side of the adjusting ring 39 along the diameter direction of the adjusting ring 39 , and the support rod 40 is perpendicular to the torus formed by the adjusting ring 39 and is fixed on the adjusting ring 39 on the opposite side of the operating rod 11 . The extension spring installation pin shaft 27 passes through the adjusting ring 39 . During adjustment, the support rod 40 is placed on the upper surface of the upper link 261 of the parallelogram mechanism 26, and the operating rod 11 is pulled upwards, so that the inner side of the adjustment ring 39 is in contact with the tension spring installation pin 27, and the operating rod 11 moves backward and upward. Movement, break away from existing notch groove, when reaching corresponding adjusting position, put down operating lever 11, finish adjusting.

As shown in Figures 7, 8a, and 8b, the parallelogram lower limiter 38 includes a pin shaft 41, a gasket 42, a compression spring 43, a lower limiter shaft 44, a limiter 45 and a lower limiter adjustment handle 12 . Wherein, the rotating shaft 44 of the lower limiting mechanism passes through the upper connecting rod 261 . Compression spring 43 and spacer 42 are successively sleeved on the part of lower limiting mechanism rotating shaft 44 positioned at the inner side of upper connecting rod 261, pin 41 is inserted into the small hole at the end of lower limiting mechanism rotating shaft 44, and compression spring 43 and gasket 42 are limit. The limiting part 45 includes a limiting part 64 and a connecting part 65, wherein the upper end of the connecting part 65 is fixedly connected with the rotating shaft 44 of the lower limiting mechanism, and the limiting part 64 is located below the upper link 261; the outer side of the upper link 261 is fixedly connected with Stopper 37, the front side of the stopper 37 is against the rear side of the connecting part 65, so that the stopper 64 is against the angle between the upper link 261 and the front link 262, and the parallelogram mechanism 26 It can only move upward, but not downward, so as to ensure the distance between the seeder and the road during transportation. When the seeder is working, at first, the connecting part 65 is moved outwards, and the limit part 64 is moved out of the angle between the upper connecting rod 261 and the front connecting rod 262, and then the connecting part 65 is rotated to make the front side of the connecting part 65 Against the rear side of the block 37 , the parallelogram lower limiting mechanism 38 no longer limits the parallelogram mechanism 26 .

As shown in Figures 5a and 5b, the depth-limiting mechanism 6 includes a depth-limiting mechanism mounting plate 46, a depth-limiting mechanism rotating shaft 47, a spring fixing pin 48, an adjustment spring 49, a depth-limiting mechanism adjusting handle 50, a limit plate 51, a Deep wheel 52, the first bevel gear transmission box 17 of the depth-limiting mechanism, the second bevel gear transmission box 56 and the intermediate transmission shaft 55 of the depth-limiting mechanism. Wherein, the first end of the depth-limiting mechanism mounting plate 46 is fixed on the universal frame 8, and its second end is close to the depth-limiting wheel 52, which is an arc-shaped end, and a plurality of adjustment holes 53 are arranged along the second end, left and right The corresponding two adjustment holes 53 of the two depth-limiting mechanism installation plates 46 form a group, and each group of adjustment holes 53 has a different height from the ground, and is used for adjusting the sowing depth.

The limiting plate 51 is arranged on the outer side of the installation plate 46 of the depth-limiting mechanism, and the depth-limiting wheel 52 is located between the left and right limiting plates 51 . One end of the limiting plate 51 is hinged with the depth-limiting mechanism mounting plate 46 through the depth-limiting mechanism rotating shaft 47 , and the other end of the limiting plate 51 is connected with the rotating shaft of the depth-limiting wheel 52 . The position limiting plate 51 is provided with a long hole corresponding in position to the second end of the depth limiting mechanism installation plate 46 .

The spring fixing pin 48 is fixed between the left and right depth-limiting mechanism mounting plates 46, and one end of the adjustment spring 49 is articulated on the spring fixing pin 48, and the other end is articulated on the depth-limiting mechanism adjusting handle 50. The two ends of the depth-limiting mechanism adjustment handle 50 are snapped into a group of adjustment holes 53 of the left and right depth-limiting mechanism mounting plates 46 and further inserted into the elongated holes of the position-limiting plate 51 . When the adjusting handle 50 of the depth-limiting mechanism is located in different adjustment holes 53 of the mounting plate 46, the angle between the limiting plate 51 and the ground changes, so that the angle between the depth-limiting wheel 52 and the ground changes, and the angle between the limiting plate 51 and the ground changes. The deep wheel 52 is thus constrained to different working depths, enabling adjustment of the sowing depth.

The two ends of limit plate 51 are respectively provided with the first bevel gear transmission box 17 of depth-limiting mechanism and the second bevel gear transmission box 56 of depth-limiting mechanism, the input shaft of the first bevel gear transmission box 17 of depth-limiting mechanism and the depth-limiting wheel 52 The axles are fixedly connected, the output shaft of the first bevel gear transmission box 17 of the depth-limiting mechanism is connected with the input shaft of the second bevel gear transmission box 56 of the depth-limiting mechanism through an intermediate transmission shaft 55, and the depth-limiting mechanisms of multiple depth-limiting mechanisms 6 The second bevel gear transmission box 56 passes through the same hexagonal transmission shaft 60 and is fixedly connected with the hexagonal transmission shaft 60. The fertilizer box transmission sprocket 57 and the cylinder transmission shaft transmission sprocket 58 are respectively arranged on the hexagonal transmission shaft 60, and the fertilizer box transmission Sprocket wheel 57 is connected with the fat box driven sprocket 62 on the fat box transmission shaft 61 by chain, and the cylinder transmission shaft transmission sprocket 58 is connected with the cylinder transmission shaft driven sprocket 66 on the cylinder transmission shaft 59.

During operation, the tractor pulls the planter through the three-point suspension mechanism 4, and the active anti-blocking mechanism 7 first enters the soil, and the depth-limiting wheel 52 rotates, thereby driving the first bevel gear transmission box 17 of the depth-limiting mechanism to rotate, and the power is transmitted through the intermediate transmission shaft 55. Pass to the second bevel gear transmission box 56 of the depth-limiting mechanism, thereby driving the hexagonal transmission shaft 60 to rotate, and the hexagonal transmission shaft 60 drives the fertilizer box driven sprocket 62 on the fertilizer box transmission shaft 61 by the fertilizer box transmission sprocket 57 to rotate, and the fertilizer From the fertilizer box 3 is transported to the fertilizer ditch between the two side plates of the ditching shovel 24 by flexible pipes to complete the fertilizer discharge. The fertilizer box driving sprocket 63 on the fertilizer box 3 drives the active anti-blocking mechanism sprocket 54 through the chain, drives the active anti-blocking roller 22 to rotate, and the straw is dialed to both sides, and is distributed in the active anti-blocking mechanism along the extension direction of the grass dividing grid 23. Block the both sides of mechanism 7, complete anti-blocking. Seeding ditch opener 35 leaves kind of ditch subsequently, and hexagonal transmission shaft 60 drives cylinder transmission shaft 59 by cylinder transmission shaft transmission sprocket 58, and the first sprocket wheel 13 of parallel four-bar linkage planting mechanism rotates with cylinder transmission shaft 59, passes through chain respectively The power is transmitted to the second sprocket wheel 14 of the parallel four-bar linkage seeding mechanism, and the second sprocket wheel 14 of the parallel four-bar linkage seeding mechanism is coaxial and fixedly connected with the third sprocket wheel 15 of the parallel four-bar linkage seeding mechanism. The third sprocket 15 of the bar seeding mechanism is transmitted to the fourth sprocket 16 of the parallel four-bar linkage seeding mechanism located at the input end of the seed meter 36, and the pneumatic seed meter 36 is connected between the fan 1 and the fourth sprocket 16 of the parallel four-bar linkage seeding mechanism. The seeding operation is completed under the joint action of the soil covering plate 34 scraping soil to fill the ditch, and then the pressing wheel 32 compacts the seed ditch to complete the operation.

Claims (5)

1. A pneumatic precision no-tillage corn seeder, including fan (1), fan frame (2), fertilizer box (3), three-point suspension mechanism (4), active anti-blocking mechanism (7), general Frame (8) and parallel four-bar linkage seeding mechanism (9); The lower end of the fertilizer box (3) is provided with a fertilizer box transmission shaft (61), and the fertilizer box driven sprocket (62) is arranged on the fertilizer box transmission shaft (61); The parallel four-bar link sowing mechanism (9) comprises a parallel four-bar link mechanism (26), a tension spring mounting pin (27), a seed meter (36), a first sprocket (13) of the parallel four-bar link sowing mechanism , wherein, the parallel four-bar linkage mechanism (26) comprises an upper link (261), a front link (262), a lower link (263) and a rear link (264), and a plurality of parallel four-bar linkage seeding mechanisms (9 The first sprocket (13) of the parallel four-bar linkage seeding mechanism of ) passes through the same cylinder transmission shaft (59), and is fixedly connected with the cylinder transmission shaft (59), and the cylinder transmission shaft driven chain is arranged on the cylinder transmission shaft (59) wheel(66); It is characterized by: The planter also includes an air pressure distribution pipe (5) and a depth limiting mechanism (6); The air outlet of the fan (1) communicates with the seed meter (36) of the parallel four-bar linkage seeding mechanism (9) through the air pressure distribution pipe (5), and the air pressure distribution pipe (5) includes a middle part and two end parts , wherein the diameter r of the middle part is smaller than the diameter R of the two ends; The parallel four-bar linkage seeding mechanism (9) also includes an extension spring adjustment ring (29), a stopper (37), and a parallel four-bar linkage lower limit mechanism (38); Described tension spring adjusting ring (29) comprises operating rod (11), adjusting ring (39) and support rod (40), operating rod (11) is fixed on adjusting ring (39) one side, and supporting rod (40) is fixed on On the adjusting ring (39) on the opposite side of the operating rod (11), the extension spring mounting pin (27) passes through the adjusting ring (39), and the support rod (40) is placed on the side of the parallelogram mechanism (26). Upper connecting rod (261) upper surface; The lower limiting mechanism (38) of the parallel four-bar linkage includes a pin shaft (41), a gasket (42), a clip spring (43), a lower limiting mechanism rotating shaft (44), a limiting component (45) and a lower limiting mechanism adjustment Handle (12), wherein the shaft of the lower limit mechanism (44) passes through the upper link (261) and is hinged with the upper link (261), and the compression spring (43) and gasket (42) are sequentially set on the lower limit mechanism On the rotating shaft (44), and on the inner side of the upper connecting rod (261), the pin shaft (41) is inserted into the small hole at the end of the rotating shaft (44) of the lower limiting mechanism, and the limiting part (45) includes a limiting part (64) and The connecting part (65), wherein the upper end of the connecting part (65) is fixedly connected with the rotating shaft (44) of the lower limiting mechanism, and the limiting part (64) is located below the upper connecting rod (261); the outer side of the upper connecting rod (261) is fixed A block (37) is connected, and the front side of the block (37) is against the rear side of the connection portion (65), so that the limit portion (64) is against the upper link (261) and the front link (262) ) at the included angle; The depth-limiting mechanism (6) includes a depth-limiting mechanism mounting plate (46), a depth-limiting mechanism rotating shaft (47), a spring fixing pin (48), an adjustment spring (49), a depth-limiting mechanism adjusting handle (50), a limit Plate (51), depth-limiting wheel (52), depth-limiting mechanism first bevel gear transmission box (17) and depth-limiting mechanism second bevel gear transmission box (56), wherein, the depth-limiting mechanism installation plate (46) the first One end is fixed on the universal frame (8), and its second end is close to the depth-limiting wheel (52), which is an arc-shaped end, and a plurality of adjustment holes (53) are arranged along the second end, and the left and right two depth-limiting The corresponding two adjustment holes (53) of the mechanism installation plate (46) are a group, and each group of adjustment holes (53) has different heights from the ground; the limit plate (51) is arranged on the depth limit mechanism installation plate (46 ), the depth-limiting wheel (52) is located between the left and right two limiting plates (51), and one end of the limiting plate (51) is hinged to the depth-limiting mechanism mounting plate (46) through the depth-limiting mechanism shaft (47), The other end of the limiting plate (51) is connected with the rotating shaft of the depth-limiting wheel (52), and the limiting plate (51) is provided with a slot corresponding to the position of the second end of the depth-limiting mechanism mounting plate (46) The spring fixing pin (48) is fixed between the left and right depth-limiting mechanism mounting plates (46), and one end of the adjustment spring (49) is hooked on the spring fixing pin (48), and the other end is hooked on the depth-limiting mechanism adjustment On the handle (50), the two ends of the depth-limiting mechanism adjustment handle (50) are snapped into a group of adjustment holes (53) of the left and right depth-limiting mechanism installation plates (46) and further inserted into the limit plate (51) in the elongated hole; The two ends of described limiting plate (51) are respectively provided with the first bevel gear transmission box (17) of depth-limiting mechanism and the second bevel gear transmission box (56) of depth-limiting mechanism, and the first bevel gear transmission box (17) of depth-limiting mechanism ) is fixedly connected with the wheel shaft of the depth-limiting wheel (52), and the output shaft of the first bevel gear transmission box (17) of the depth-limiting mechanism is connected with the input shaft of the second bevel gear transmission box (56) of the depth-limiting mechanism. The second bevel gear transmission box (56) of the depth limiting mechanism (6) passes through the same hexagonal transmission shaft (60), and is fixedly connected with the hexagonal transmission shaft (60), and is respectively arranged on the hexagonal transmission shaft (60). Fertilizer box drive sprocket (57) and cylinder drive shaft drive sprocket (58), and fertilizer box drive sprocket (57) is connected with fertilizer box driven sprocket (62) on the fertilizer box drive shaft (61), cylinder The transmission shaft transmission sprocket (58) is connected with the cylinder transmission shaft driven sprocket (66) on the cylinder transmission shaft (59). 2. The pneumatic corn precision no-tillage seeder according to claim 1, characterized in that: The relationship between the diameter r of the middle part of the air pressure distribution pipe (5) and the diameter R of both ends of the air pressure distribution pipe (5) is 3r ² =2R ² . 3. The pneumatic corn precision no-tillage seeder according to claim 1, characterized in that: The length L of the middle part of the wind pressure distribution pipe (5) is greater than the length l of the two end parts, and L=2l. 4. The pneumatic corn precision no-tillage seeder according to claim 1, characterized in that: The operating rod (11) is fixed on one side of the adjusting ring (39) along the diameter direction of the adjusting ring (39); The support rod (40) is perpendicular to the torus formed by the adjustment ring (39). 5. The pneumatic corn precision no-tillage seeder according to claim 1, characterized in that: The output shaft of the first bevel gear transmission box (17) of the depth-limiting mechanism is connected with the input shaft of the second bevel gear transmission box (56) of the depth-limiting mechanism through an intermediate transmission shaft (55).