Excavating and threshing device of peanut harvester

Abstract

The utility model discloses an excavating and threshing device of a peanut harvester, which comprises a rack, square steels are arranged on two sides of the front end of the rack, shovel frames are arranged at the inner bottom ends of the two square steels in a sliding manner through fasteners, shovel blades are obliquely arranged at the front ends of the two shovel frames, and a threshing mechanism is arranged at the bottom of the rear end of the rack. The threshing mechanism comprises a mounting frame mounted at the bottom of the rack, and two fruit picking rollers are rotationally mounted on one side of the mounting frame; peanut vines excavated by the scraper knife are conveyed to the position between the two rotating peanut picking rollers through the two conveying chains, the rotating speed of the peanut picking rollers is set to be a constant value, peanut shells are prevented from being broken due to the fact that the beating plates beat the peanut vines, and meanwhile the peanut combing plates are further installed on the outer surfaces of the peanut picking rollers, so that the peanut vines can be separated from the peanut vines. Peanut fruits which are not flapped off are raked through the fruit combing plate, so that the peanut fruits are picked off, the situation that the flapping force is too small and the fruit picking rate is low is avoided, and the fruit picking performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a digging and threshing device for a peanut harvester. Background Technique

[0002] Peanuts are widely planted in China, and peanut harvesters play a very important role in the peanut harvesting process.

[0003] At present, the peanut harvesters in use generally adopt a beating method to detach peanut fruits. The peanut vines are beaten by a rotating device rotating at a high speed, so as to separate the peanut fruits from the peanut vines.

[0004] Since the dryness and humidity of peanut vines and fruits are different when they are dug out of the ground, different beating forces are required during fruit picking. When the rotating speed of the rotating device is too high, the fruit shells are easily broken by beating. When the rotating force of the rotating device is too small, it is difficult for peanut fruits to separate from peanut vines. Therefore, there is an urgent need for a digging and threshing device for a new type of peanut harvester. Summary of the Utility Model

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present utility model is to provide a digging and threshing device for a peanut harvester, which effectively solves the problem that since the dryness and humidity of peanut vines and fruits are different when they are dug out of the ground, different beating forces are required during fruit picking. When the rotating speed of the rotating device is too high, the fruit shells are easily broken by beating. When the rotating force of the rotating device is too small, it is difficult for peanut fruits to separate from peanut vines. Therefore, there is an urgent need for a digging and threshing device for a new type of peanut harvester.

[0006] The technical solution it adopts is that a digging and threshing device for a peanut harvester, the digging and threshing device includes a frame, square tubes are installed on both sides of the front end of the frame, the inner bottom ends of the two square tubes are slidably installed with shovel frames through fasteners, and shovel blades are obliquely installed at the front ends of the two shovel frames;

[0007] A threshing mechanism is installed at the bottom of the rear end of the frame. The threshing mechanism includes a mounting frame installed at the bottom of the frame. Two fruit picking rollers are rotatably installed on one side of the mounting frame. A conveying mechanism for conveying peanut vines between the two fruit picking rollers is installed inside the frame. A plurality of striking plates are circumferentially arranged on the outer surface of the fruit picking roller in an array, and a plurality of combing plates are circumferentially arranged on the outer surface of the fruit picking roller in an array. The combing plates and the striking plates are arranged alternately. A driving component cooperating with the two fruit picking rollers is installed on one side of the mounting frame.

[0008] Preferably, the driving assembly includes a gear rod rotatably mounted on one side of the mounting frame, two first bevel gears are mounted on the periphery of the gear rod, a second bevel gear is mounted on one end of the two fruit picking rollers, the first bevel gear is meshed with the second bevel gear, a toothed disc is mounted on one side of the gear rod, and a transmission mechanism cooperating with the toothed disc and the conveying mechanism is mounted on one side of the frame.

[0009] Preferably, the conveying mechanism includes multiple first sprockets, which are rotatably installed on both sides of the front end of the frame, and conveying shafts are rotatably installed on both sides of the rear end of the frame. Second sprockets are installed on the periphery of the bottom ends of the two conveying shafts, and the two second sprockets cooperate with the transmission mechanism. Two conveying chains are wound between the multiple first sprockets and the two second sprockets, and a guide rail assembly that cooperates with the two conveying chains is installed on one side of the frame.

[0010] Preferably, the guide rail assembly includes limit frames installed on both outer sides of the frame through positioning pieces, and the conveying chain is rotatably arranged in the limit frames, a plurality of fixed blocks are arranged on the inner side of the frame, abutment plates are installed on one side of the fixed blocks through bolts, and the side of the abutment plate facing away from the fixed block abuts against the inner side of one of the conveying chains, a plurality of spring rods are installed through the other inner side of the frame, a hinge block is installed at one end of the plurality of spring rods, a spring is provided on the outer movable sleeve of the spring rod, two ends of the spring abut against one side of the hinge block and the inner side of the frame respectively, a top plate is hingedly arranged between two adjacent hinge blocks, and the top plate abuts against the inner side of another conveying chain.

[0011] Preferably, the transmission mechanism includes a first rotating rod rotatably mounted on one side of the frame, a first pulley is mounted on one side of the first rotating rod, a first chainring is mounted on the other side of the first rotating rod, a second rotating rod is rotatably mounted on one side of the frame, second chainrings are mounted on both ends of the second rotating rod, and two transmission chains are meshed between the first chainring, the two second chainrings and the toothed disc.

[0012] Preferably, the transmission mechanism also includes a driving rod rotatably mounted on one side of the frame, a first sprocket disk is mounted on one side of the driving rod, a second pulley is mounted on one side of the driving rod, a transmission rod is rotatably mounted on the top of the frame, a second sprocket disk is mounted on one side of the transmission rod, a driving chain is meshed between the first sprocket disk and the second sprocket disk, two small gears are mounted on the periphery of the transmission rod, a large gear meshed with the small gears is mounted on the top of the two conveying shafts, and a tensioning assembly matching the driving chain is rotatably mounted on one side of the frame.

[0013] Preferably, the tensioning assembly includes a swing arm rotatably mounted on one side of the frame. A third sprocket is rotatably mounted on one side of the swing arm. The third sprocket meshes with the outside of the drive chain. A tension spring is hung on one side of the swing arm. The other side of the tension spring is hung with an adjusting screw. The adjusting screw is installed on one side of the frame through a nut.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The peanut seedlings dug out by the shovel of the present utility model are conveyed to between two rotating threshing rollers by two conveyor chains. The rotational speed of the threshing rollers is set to a constant value. Some simply picked peanut fruits are first slapped off by the beating of the striking plate, avoiding the crushing of peanut husks by excessive force of the striking plate. At the same time, a fruit combing plate is also installed on the outer surface of the threshing roller. The peanut fruits that have not been slapped off are raked by the fruit combing plate, so as to pick off the peanut fruits, avoiding too small beating force and low threshing rate, and increasing the threshing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the first perspective of the excavation and threshing device of the peanut harvester of the present utility model.

[0017] Figure 2 is a schematic structural diagram of the first perspective of the excavation and threshing device of the present utility model.

[0018] Figure 3 is a schematic structural diagram of the conveying mechanism of the present utility model.

[0019] Figure 4 is the present utility model Figure 3 The enlarged schematic diagram at A in.

[0020] Figure 5 is a schematic structural diagram of the threshing mechanism of the present utility model.

[0021] Figure 6 is a schematic structural diagram of the threshing roller of the present utility model.

[0022] Figure 7 is a schematic structural diagram of the first rotating rod of the present utility model.

[0023] Figure 8 is a schematic structural diagram of the drive rod of the present utility model.

[0024] Figure 9 is a schematic structural diagram of the tensioning assembly of the present utility model.

[0025] Explanation of the reference numerals in the schematic diagram:

[0026] 1. Frame; 11. Fixed block;

[0027] 2. Shovel blade;

[0028] 3. Square tube; 31. Shovel frame;

[0029] 4. Mounting frame; 41. Fruit picking roller; 42. Striker plate; 43. Combing and picking plate; 44. Rack bar; 45. First helical gear; 46. Second helical gear; 47. Tooth disc;

[0030] 5. First sprocket; 51. Second sprocket; 52. Conveyor chain; 53. Limiting frame; 54. Contact plate; 55. Spring rod; 56. Hinge block; 57. Spring; 58. Top plate; 59. Conveyor shaft;

[0031] 6. First rotating rod; 61. First pulley; 62. Second rotating rod; 63. Second tooth disc; 64. Transmission chain;

[0032] 7. Driving rod; 71. Second pulley; 72. Transmission rod; 73. Second sprocket disc; 74. Driving chain; 75. Pinion; 76. Gear;

[0033] 8. Swing arm; 81. Third sprocket disc; 82. Tightening spring; 83. Adjusting screw; 84. Nut. Detailed implementation manner

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Provided by Figures 1 to 2 is a digging and threshing device for a peanut harvester. The digging and threshing device is installed on the main body of the peanut harvester, and the peanut harvester also includes functional structures such as a soil separation device and a separation and cleaning device; the digging and threshing device digs the peanuts in the field, then the soil separation device separates the soil on the peanut fruits, and then the digging and threshing device separates the peanut fruits, and finally the peanut fruits fall to the separation and cleaning device for screening.

[0036] Provided by Figures 1 to 2 is that, first of all, the digging and threshing device includes a frame 1, two square tubes 3, two fasteners, two shovel frames 31, two shovel blades 2, a threshing mechanism, a conveying mechanism and a transmission mechanism.

[0037] Specifically, the frame 1 is installed at the front end of the peanut harvester. Two square tubes 3 are inclined and installed on both sides of the front end of the frame 1. The two fasteners are both bolts. Two shovel frames 31 are respectively installed at the inner bottom ends of the two square tubes 3 through bolts. Two shovels 2 are respectively installed at the front ends of the two shovel frames 31, and the two shovels 2 are in an inward V-shaped structure. More specifically, loosening the bolts can enable the shovel frame 31 to slide in the square tube 3, thereby adjusting the height of the shovel 2 and changing the depth of the shovel 2 inserted into the soil. The shovel 2 excavates the peanut vines and shovels out the peanut vines from the soil.

[0038] Given by Figures 3 to 4 Then, the conveying mechanism is installed on both sides of the frame 1. The conveying mechanism includes a plurality of first sprockets 5, two conveying shafts 59, two second sprockets 51, two conveying chains 52 and a guide rail assembly.

[0039] Specifically, a plurality of first sprockets 5 are respectively installed on both sides of the front end of the frame 1. Two conveying shafts 59 are respectively rotatably installed on both sides of the rear end of the frame 1. Two second sprockets 51 are respectively installed at the bottom ends of the two conveying shafts 59. Two conveying chains 52 are respectively wound and installed between the plurality of first sprockets 5 and the two second sprockets 51. More specifically, the two conveying chains 52 cooperate to form a conveying channel. The two conveying chains 52 clamp the two sides of the peanut vines. The conveying shaft 59 can drive the second sprocket 51 to rotate. The two second sprockets 51 drive the two conveying chains 52 to rotate. The two conveying chains 52 drive the peanut vines to move during rotation.

[0040] The guide rail assembly is installed on both sides of the frame 1. The guide rail assembly includes two limit frames 53, a positioning member, a plurality of fixing blocks 11, a contact plate 54, a plurality of spring rods 55, a plurality of hinge blocks 56, a plurality of springs 57 and a plurality of top plates 58.

[0041] Specifically, the positioning member is a screw. The two limit frames 53 are respectively installed on the two outer sides of the frame 1 through screws. A plurality of fixing blocks 11 are arranged on the inner side of the frame 1. The contact plate 54 is installed on one side of the fixing block 11, and the side of the contact plate 54 facing away from the fixing block 11 abuts against the inner side of one of the conveying chains 52. A plurality of spring rods 55 are installed through one side of the frame 1. A plurality of hinge blocks 56 are respectively installed on one side of the plurality of spring rods 55. A plurality of springs 57 are respectively sleeved on the periphery of the plurality of spring rods 55, and the two ends of the spring 57 respectively abut against the hinge block 56 and the inner side of the frame 1. A plurality of top plates 58 are respectively hinged and installed between adjacent two hinge blocks 56. More specifically, the limit frame 53 limits the conveying chain 52. By turning the screw, the position of the limit frame 53 can be adjusted, and then the position of the conveying chain 52 can be adjusted.

[0042] Preferably, the abutting plate 54 is connected to the fixed block 11 by bolts. By loosening the bolts, the position of the abutting plate 54 can be adjusted, thereby adjusting the distance between the conveying chain 52 and the inner wall of the frame 1, and at the same time adjusting the distance between the two conveying chains 52. Moreover, the spring 57 elastically supports the hinge block 56, and the hinge block 56 drives the top plate 58 to move, so that the top plate 58 continuously presses against one of the conveying chains 52, enabling it to adapt to the conveyance of peanut vines of different thicknesses, automatically adjusting the distance between the two conveying chains 52, and keeping the two conveying chains 52 always clamping both sides of the peanut vines.

[0043] given by Figures 5 to 6 Secondly, the threshing mechanism is rotatably installed at the bottom of the frame 1. The threshing mechanism includes a mounting frame 4, two fruit picking rollers 41, a striking plate 42, a comb picking plate 43 and a driving assembly.

[0044] Specifically, the mounting frame 4 is installed at the bottom of the frame 1. Two fruit picking rollers 41 are rotatably installed on one side of the mounting frame 4. Six striking plates 42 and six comb picking plates 43 are respectively provided. The six striking plates 42 are respectively installed on the outer surfaces of the two fruit picking rollers 41 in a circumferential array, and the six comb picking plates 43 are respectively installed on the outer surfaces of the two fruit picking rollers 41 in a circumferential array, and the comb picking plates 43 and the striking plates 42 are arranged alternately. Specifically, the rotational speeds of the two fruit picking rollers 41 are constant values, and there is no need for too high a rotational speed to avoid crushing the peanut shells when the striking plates 42 beat the peanut fruits. The provided striking plates 42 are only for picking some simply picked peanut fruits; the comb picking plates 43 are in a comb structure, and the comb picking plates 43 rake the peanut fruits during rotation.

[0045] The driving assembly is installed on one side of the mounting frame 4. The driving assembly includes a rack 44, two first helical gears 45, two second helical gears 46 and a gear disc 47.

[0046] Specifically, the rack 44 is rotatably installed on one side of the mounting frame 4. Two first helical gears 45 are installed on the periphery of the rack 44. Two second helical gears 46 are respectively installed on one side of the two fruit picking rollers 41, and the first helical gear 45 meshes with the second helical gear 46. The gear disc 47 is installed on one side of the rack 44, and the gear disc 47 is connected to the transmission mechanism. More specifically, the rack 44 can rotate, and the rack 44 drives the two fruit picking rollers 41 to rotate through the first helical gear 45 and the second helical gear 46.

[0047] given by Figures 7 to 8 Secondly, the transmission mechanism is installed on the frame 1. The transmission mechanism includes a first rotating rod 6, a first belt pulley 61, a first sprocket, a second rotating rod 62, two second sprockets 63 and two transmission chains 64.

[0048] Specifically, the first rotating rod 6 is rotatably installed on one side of the frame 1, the first pulley 61 is installed on one side of the first rotating rod 6, the first chainring is installed on the other side of the first rotating rod 6, the second rotating rod 62 is rotatably installed in the middle of the frame 1, and the two second chainrings 63 are respectively installed at both ends of the second rotating rod 62, one of the transmission chains 64 is meshed between the first chainring and one of the second chainrings 63, and the other transmission chain 64 is meshed between the other second chainring 63 and the toothed disc 47. Specifically, the first pulley 61 is connected to the engine of the harvester through a belt, and the engine rotates the first pulley 61, and the first pulley 61 drives the toothed disc 47 to rotate through the first rotating rod 6, the first chainring, the second rotating rod 62, the two second chainrings 63 and the two transmission chains 64.

[0049] Meanwhile, the transmission mechanism further comprises a driving rod 7, a first sprocket, a second pulley 71, a transmission rod 72, a second sprocket 73, a driving chain 74, two small gears 75, two large gears 76 and a tensioning assembly.

[0050] Specifically, the driving rod 7 is rotatably mounted on the side of the frame 1 away from the first rotating rod 6, the first sprocket plate is mounted on the inner end of the driving rod 7, the second pulley 71 is mounted on the outer end of the driving rod 7, the transmission rod 72 is rotatably mounted on the top of the frame 1, the second sprocket plate 73 is mounted on one side of the transmission rod 72, the driving chain 74 is meshed between the first sprocket plate and the second sprocket plate 73, two small gears 75 are mounted on the periphery of the transmission rod 72, and two large gears 76 are respectively mounted on the top of the two conveying shafts 59, and the small gears 75 are meshed with the large gears 76. More specifically, the second pulley 71 is connected to the engine of the harvester through a belt, and the driving rod 7 drives the two conveying shafts 59 to rotate through the first sprocket plate, the transmission rod 72, the second sprocket plate 73, the driving chain 74, the two small gears 75, and the two large gears 76.

[0051] Depend on Figures 8 to 9 Finally, the tensioning assembly is provided with multiple groups, and the multiple groups of tensioning assemblies are respectively matched with the two transmission chains 64 and the drive chain 74. The tensioning assembly is to ensure the tightness of the two transmission chains 64 and the drive chain 74, and to prevent the two transmission chains 64 and the drive chain 74 from being installed too loosely and thus falling off. The following is a detailed introduction to the installation structure of one group of tensioning assemblies:

[0052] The tensioning assembly is installed on one side of the frame 1 , and the tensioning assembly includes a swing arm 8 , a third sprocket wheel 81 , a tensioning spring 82 , an adjusting screw 83 and a nut 84 .

[0053] Specifically, the swing arm 8 is rotatably installed on one side of the frame 1, and the third sprocket disc 81 is rotatably installed on the other side of the swing arm 8. The third sprocket disc 81 meshes with the outer side of the drive chain 74. The tension spring 82 is hooked on the side of the swing arm 8 close to the third sprocket disc 81. The adjusting screw 83 is hooked on the end of the tension spring 82 away from the swing arm 8, and the other end of the adjusting screw 83 is installed on one side of the frame 1 through a nut 84. Specifically, by turning the nut 84, the position of the adjusting screw 83 is moved. The adjusting screw 83 pulls the swing arm 8 to rotate through the tension spring 82, so that the third sprocket disc 81 presses the drive chain 74, changing the tightness of the drive chain 74.

[0054] Beneficial effects obtained from the frame 1, two square tubes 3, two fasteners, two shovel frames 31, two shovels 2, a threshing mechanism, a conveying mechanism, and a transmission mechanism: The peanut seedlings dug out by the shovels 2 are conveyed by two conveying chains 52 between two rotating threshing rollers 41. The rotation speed of the threshing rollers 41 is set to a constant value. Some simply picked peanut fruits are first slapped down by the slapping of the slapping plates 42, avoiding the slapping plates 42 having too much force and crushing the peanut shells. At the same time, a combing plate 43 is also installed on the outer surface of the threshing roller 41. The peanut fruits that have not been slapped down are raked by the combing plate 43, so as to pick the peanut fruits, avoiding too small slapping force and low threshing rate, and increasing the threshing performance.

[0055] When the present utility model is in use and during conveying: First, the engine installed on the harvester drives the second pulley 71 through a belt, and the second pulley 71 drives the drive rod 7 to rotate. Then, the drive rod 7 drives the transmission rod 72 to rotate through the first sprocket disc, the second sprocket disc 73, and the drive chain 74. Then, the transmission rod 72 drives two conveying shafts 59 to rotate through two small gears 75 and two large gears 76. The two conveying shafts 59 drive two conveying chains 52 to rotate through the second sprockets 51, and the two conveying chains 52 drive the peanut seedlings to move during rotation.

[0056] During threshing: First, the engine installed on the harvester drives the first pulley 61 to rotate through a belt, and the first pulley 61 drives the first rotating rod 6 to rotate. Then, the first rotating rod 6 drives the second rotating rod 62 to rotate through the first tooth disc, the second tooth disc 63, and the transmission chain 64. Then, the second rotating rod 62 drives the rack 44 to rotate through another second tooth disc 63, another transmission chain 64, and the tooth disc 47. The rack 44 drives two threshing rollers 41 to rotate through the first helical gear 45 and the second helical gear 46. The rotation speed of the two threshing rollers 41 is a constant value. The two threshing rollers 41 drive the slapping plates 42 to slap the peanut fruits, and the combing plates 43 rake the peanut fruits, thereby performing the threshing work.

[0057] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A digging and threshing device for a peanut harvester, characterized in that: The excavating and threshing device comprises a frame (1), square tubes (3) are installed on both sides of the front end of the frame (1), shovel frames (31) are slidably installed on the inner bottom ends of the two square tubes (3) through fasteners, and shovel blades (2) are installed obliquely at the front ends of the two shovel frames (31); A threshing mechanism is installed at the bottom of the rear end of the frame (1), and the threshing mechanism includes a mounting frame (4) mounted at the bottom of the frame (1), two fruit picking rollers (41) are rotatably mounted on one side of the mounting frame (4), a conveying mechanism for conveying peanut vines to between the two fruit picking rollers (41) is installed inside the frame (1), a plurality of knockout plates (42) are installed in a circular array on the outer surface of the fruit picking roller (41), a plurality of combing and picking plates (43) are installed in a circular array on the outer surface of the fruit picking roller (41), the combing and picking plates (43) and the knockout plates (42) are arranged in an alternating manner, and a driving component that cooperates with the two fruit picking rollers (41) is installed on one side of the mounting frame (4).

2. The excavating and threshing device of a peanut harvester according to claim 1, characterized in that: The driving assembly comprises a gear rod (44) rotatably mounted on one side of the mounting frame (4); two first bevel gears (45) are mounted on the periphery of the gear rod (44); a second bevel gear (46) is mounted on one end of each of the two fruit picking rollers (41); the first bevel gear (45) meshes with the second bevel gear (46); a toothed disc (47) is mounted on one side of the gear rod (44); and a transmission mechanism matched with the toothed disc (47) and a conveying mechanism is mounted on one side of the frame (1).

3. The excavating and threshing device of a peanut harvester according to claim 2, characterized in that The conveying mechanism comprises a plurality of first sprocket wheels (5), the plurality of first sprocket wheels (5) are rotatably mounted on both sides of the front end of a frame (1), a conveying shaft (59) is rotatably mounted on both sides of the rear end of the frame (1), a second sprocket wheel (51) is mounted on the periphery of the bottom ends of the two conveying shafts (59), the two second sprocket wheels (51) are matched with the transmission mechanism, two conveying chains (52) are wound between the plurality of first sprocket wheels (5) and the two second sprocket wheels (51), and a guide rail assembly matched with the two conveying chains (52) is mounted on one side of the frame (1).

4. The excavating and threshing device of a peanut harvester according to claim 3, characterized in that: The guide rail assembly comprises limit frames (53) respectively mounted on two outer sides of the frame (1) through positioning members, and the conveying chain (52) is rotatably arranged in the limit frames (53), a plurality of fixed blocks (11) are arranged on the inner side of the frame (1), an abutment plate (54) is mounted on one side of the fixed block (11) through bolts, and a side of the abutment plate (54) facing away from the fixed block (11) abuts against the inner side of one of the conveying chains (52), and the frame (1) A plurality of spring rods (55) are installed through the other inner side of the plurality of spring rods (55), one end of each of the plurality of spring rods (55) is installed with a hinge block (56), a spring (57) is provided on the outer movable sleeve of the spring rod (55), two ends of the spring (57) respectively abut against one side of the hinge block (56) and the inner side of the frame (1), a top plate (58) is hingedly provided between two adjacent hinge blocks (56), and the top plate (58) abuts against the inner side of another conveying chain (52).

5. The excavating and threshing device of a peanut harvester according to claim 2, characterized in that: The transmission mechanism comprises a first rotating rod (6) rotatably mounted on one side of a frame (1), a first pulley (61) being mounted on one side of the first rotating rod (6), a first chainring being mounted on the other side of the first rotating rod (6), a second rotating rod (62) being rotatably mounted on one side of the frame (1), second chainrings (63) being mounted on both ends of the second rotating rod (62), and two transmission chains (64) being meshed between the first chainring, the two second chainrings (63) and the toothed disc (47).

6. The excavating and threshing device of a peanut harvester according to claim 3, characterized in that: The transmission mechanism further comprises a driving rod (7) rotatably mounted on one side of the frame (1), a first sprocket wheel being mounted on one side of the driving rod (7), a second belt pulley (71) being mounted on one side of the driving rod (7), a transmission rod (72) being rotatably mounted on the top of the frame (1), a second sprocket wheel (73) being mounted on one side of the transmission rod (72), a driving chain (74) being meshed between the first sprocket wheel and the second sprocket wheel (73), two small gears (75) being mounted on the periphery of the transmission rod (72), a large gear (76) meshing with the small gears (75) being mounted on the top ends of the two conveying shafts (59), and a tensioning assembly cooperating with the driving chain (74) being rotatably mounted on one side of the frame (1).

7. The excavating and threshing device of a peanut harvester according to claim 6, characterized in that: The tensioning assembly comprises a swing arm (8) rotatably mounted on one side of the frame (1); a third sprocket (81) is rotatably mounted on one side of the swing arm (8); the third sprocket (81) is engaged with the outer side of the driving chain (74); a tensioning spring (82) is hung on one side of the swing arm (8); an adjusting screw (83) is hung on the other side of the tensioning spring (82); and the adjusting screw (83) is mounted on one side of the frame (1) via a nut (84).

Images