CN211152654U

CN211152654U - Rice stubble field rape covers grass seeder

Info

Publication number: CN211152654U
Application number: CN201921509665.XU
Authority: CN
Inventors: 廖宜涛; 廖庆喜; 李玥宾; 舒彩霞; 张青松; 肖文立
Original assignee: Huazhong Agricultural University
Current assignee: Huazhong Agricultural University
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-08-04
Anticipated expiration: 2029-09-11

Abstract

The utility model discloses a rape grass-covering seeder for rice stubble fields, which comprises a straw mulching and returning device and a seeder; the seeder comprises a main frame, a rotary tillage and soil preparation device, a fertilizer seed box, a seed sowing device, a double-disc furrow opener front furrow plough, a rear furrow plough and a land wheel; the straw mulching and returning device comprises a front auxiliary frame, a spiral auger conveyor, an elastic tooth pickup device, two sets of chain harrow conveying devices and two sets of conveying belts, wherein the elastic tooth pickup device is rotatably arranged on the spiral auger conveyor; can pick up the straw float grass through the bullet tooth pickup before the rape is direct sowed and throw the auger delivery ware, simultaneously, carry out rotary tillage soil preparation, ditching to the earth's surface that does not contain the straw to fertilize, sow, the straw float grass of throwing auger delivery ware covers the straw float grass after the seeding still field, can realize the effective still field utilization of straw resource, improves rape and plants fertilizer utilization ratio.

Description

Rice stubble field rape covers grass seeder

Technical Field

The utility model belongs to the technical field of the seeding among the agricultural machine, concretely relates to seeder that covers grass of rice stubble field rape.

Background

In China, the traditional rape planting mode is that manual work and machinery are combined, manual transplanting or manual work firstly slides seeds, seedlings are thinned and fixed after sowing are carried out, the sowing quality is guaranteed, but the manual labor intensity is high, the working procedures of rotary tillage, stubble cleaning, fertilization, ditching and the like are independently carried out, a tractor is needed to put the rape into the field for multiple times, the working steps are multiple, the labor consumption and the time consumption are high, the production cost is high, and the efficiency is low. In the rice oil tanker working area in the middle and lower reaches of the Yangtze river, after the rice is harvested by the rice planter, the rape combined planter can complete rotary tillage, ditching, sowing and fertilizing operation, but the amount of the previous rice straws is large, the operation machines are easy to block, and the straw treatment before direct seeding is an urgent problem to be solved. Under the condition that the straws are not burnt, the difficulty of returning the straws to the field is high. The rice straws of the previous stubble are turned into the soil before the rape is sowed and are decomposed, the soil is loosened after the straws are returned to the field, the seed germination is influenced, worm eggs and bacteria cannot be killed, and the continuous cropping is not suitable. The rice straw is covered on the soil surface before rape planting by adopting a covering and returning mode, so that the organic matter content of the soil can be increased, and the temperature and the humidity of the soil can be adjusted. The straw coverage can promote the growth period of the rape to be advanced and increase the production, the branch number and the single plant silique number are increased, and the early emergence and the early maturity are obvious.

The Chinese patent with the application number of 201711161716.X discloses a straw mulching land no-tillage clean area seeder suitable for wide-narrow row planting of corn, the full straw mulching land without any treatment of straws after crop harvesting is completed, the machine is used for finishing straw smashing after being put down to the field, picking and collecting, stubble breaking and soil breaking, seedbed arrangement, fertilizing and seeding and straw mulching returning are achieved, but the straw smashing energy consumption of the compound operation machine is high, the fuel oil consumption of machine operation is large, and a large-horsepower tractor needs to be matched.

The Chinese patent with the application number of 201320401348.2 discloses a crawler-type multifunctional rape grass-covering direct seeding seeder, wherein a frame is arranged on a crawler traveling system, a horizontal header, a straw chopping and conveying system and a throwing mechanism are sequentially arranged from front to back, a rotary tillage and ditching system is arranged below, and a seeding and fertilizing system is arranged behind the rotary tillage and ditching system. The whole machine has complex structure, large mass, large load borne by the crawler traveling system, large power consumption and high cost. The straw picking and conveying mechanism is huge in size, so that the machine body is too long, the straw picking efficiency is low, and the straw picking and conveying mechanism is not suitable for small field operation.

Disclosure of Invention

The utility model aims at manufacturing cotton wheat sleeve, and provides a rice stubble field rape grass covering seeder which integrates the functions of picking up straws, conveying, back throwing, rotary tillage, stubble cleaning, ditching, fertilizing, seeding and covering straws.

In order to realize the aim, the utility model relates to a rape covering and seeding machine for rice stubble fields, which comprises a straw covering and returning device and a seeding machine, wherein the straw covering and returning device is positioned at the front end of the seeding machine; the seeder comprises a main frame, a rotary tillage and soil preparation device welded on the front end of the main frame, two fertilizer seed boxes symmetrically arranged in the middle of the main frame, a seed sowing device arranged at the middle rear part of the main frame, a plurality of sets of double-disc furrow openers uniformly arranged at the rear end of the main frame, two front furrow plows symmetrically arranged on two sides of the main frame, two rear furrow plows symmetrically arranged on two sides of the main frame and two land wheels; the straw mulching and returning device comprises a front auxiliary frame, a spiral auger conveyor, an elastic tooth pickup device, two sets of chain harrow conveying devices and two sets of conveying belts, wherein the elastic tooth pickup device is rotatably arranged on the spiral auger conveyor; the two sets of chain harrow conveying devices are symmetrically arranged at two sides of the spiral conveyor, and the two sets of conveying belts and the two sets of chain harrow conveying devices are correspondingly arranged and connected one by one;

the main frame comprises a front cross beam, a rear cross beam, a left side plate, a right side plate, a rear suspension frame assembly and a pair of suspension rods, wherein the front cross beam, the rear cross beam, the left side plate and the right side plate are enclosed to form a rectangular frame, one end of each suspension rod is welded on the front cross beam, the suspension rods are symmetrically arranged along the front cross beam, the front auxiliary frame comprises a front beam, a rear beam, a left side beam, a right side beam and the front suspension frame assembly, and a pair of L type suspension plates, the front beam, the rear beam, the left side beam and the right side beam are enclosed to form a rectangular frame, transverse plates of a pair of L type suspension plates are fixedly welded on the rear beam, a pair of L type suspension plates are symmetrically arranged along the length direction of the rear beam, the front suspension frame assembly is hinged with the rear suspension frame assembly through an upper pull rod, a plurality of vertically arranged bolt holes are formed in the vertical plates of the L type suspension plates, correspondingly, fixing holes are formed in the front ends of the suspension rods, a pair of L type suspension plates and a pair of suspender L type suspension plates are arranged in.

Furthermore, the front suspension bracket assembly comprises two first front support rods and two second front support rods, one ends of the two first front support rods are fixed on the front welding seat, the other ends of the two first front support rods are fixed on the front beam, one ends of the two second front support rods are hinged on the front welding seat, and the other ends of the two second front support rods are hinged on the rear beam; the rear suspension bracket assembly comprises two first rear support rods and two second rear support rods, one ends of the two first rear support rods are welded on the rear welding seat, the other ends of the two first rear support rods are respectively welded on the pair of hanging rods, one ends of the two second rear support rods are hinged on the rear welding seat, and the other ends of the two second rear support rods are hinged on the rear cross beam; one end of the upper pull rod is hinged to a front shaft of the front welding seat of the front auxiliary frame, and the other end of the upper pull rod is hinged to a rear shaft of the rear welding seat of the main frame.

Further, the auger conveyer includes auger bottom plate, auger baffle, two auger curb plates, auger carries axle, two helical blade and circular baffle, and auger bottom plate, auger baffle and two auger curb plates enclose to close and form an open-ended box, and one the auger curb plate is fixed on left side roof beam, another the auger curb plate is fixed on right side roof beam, bearing frame are passed through respectively to the both ends that the auger carried the axle and are fixed on two auger curb plates at the auger, circular baffle passes the auger and carries the central point that the axle is fixed in auger carries the axle to put, two helical blade uses circular baffle to be the center and is symmetric distribution and installs at the auger and carry epaxially, bullet tooth pickup rotationally installs on the auger bottom plate.

Furthermore, the elastic tooth pickup device comprises three rows of elastic teeth which are uniformly distributed along the circumference; the cylinder diameter of the elastic tooth picker is 210-230 mm, the maximum picking width of the elastic tooth picker is 1.8-2.2 m, the length of each elastic tooth is 115-125 mm, the diameter of each elastic tooth is 4.5-5.5, the distance between every two adjacent elastic teeth is 60-70 mm, and the operation ground clearance of the elastic tooth picker is 28-32 mm.

Furthermore, two sides of the auger baffle are provided with windows for the front end of the chain harrow housing of the chain harrow conveying device to pass through, the two helical blades are positioned between the inner side edges of the two windows, and the arc length of the window in the length direction is 250-270 mm; in addition, the auger conveying shaft which is right opposite to the window is welded with guide pieces, each guide piece is 90-110 mm long and 25-35 mm high, two guide pieces in each row are circumferentially and uniformly distributed on the auger conveying shaft in total three rows.

Furthermore, the seeder also comprises a rear auxiliary frame welded on the main frame, the rear auxiliary frame comprises a left side rod, a right side rod and a cross rod, one end of the left side rod is fixed on the left side plate, one end of the right side rod is fixed on the right side plate, and the cross rod is lined between the left side rod and the right side rod; the rotary tillage and soil preparation device is arranged on the front beam, one front furrow plough and one rear furrow plough are arranged on the left side plate, and the other front furrow plough and the other rear furrow plough are arranged on the right side plate.

Furthermore, the conveyer belt and the horizontal ground form an included angle of 3-5 degrees.

Further, the straw covers still field device still includes the transition gear box, the input of transition gear box passes through the shaft coupling and links to each other with the tractor, the back output shaft and the central gear box input of transition gear box are connected, the power of the left output shaft of transition gear box divides two the tunnel and inputs respectively to bullet tooth pickup and auger conveyer, auger conveyer passes through chain drive with power transmission to chain harrow conveyor, chain harrow conveyor passes through chain drive with power transmission to the conveyer belt.

Compared with the prior art, the utility model has the advantages of it is following: the utility model can pick up the straw and float grass by the elastic tooth pick-up device and throw the straw and float grass to the spiral conveyer before the direct seeding of the rape, at the same time, carrying out rotary tillage, soil preparation and ditching on the ground surface without straws, fertilizing and seeding, rapidly pushing the straw float grass thrown to the screw conveyor to the port of the chain harrow conveyor at the two sides through the helical blade, lifting the straw float grass by the chain harrow conveyor to fall onto the conveyor belt, uniformly scattering the straw float grass on the ground surface after transportation and covering the straw float grass on the surface of a compartment after seeding, the straw float grass is covered and returned to the field after sowing, the procedures of picking up, conveying, rear throwing, rotary tillage, stubble cleaning, ditching, fertilizing, sowing, covering straw and the like can be completed simultaneously through one-time operation, the straw float grass can be operated on dry land, the operation can also be performed on the ground with more straw float grass, the effective returning utilization of straw resources can be realized, and the utilization rate of fertilizer for rape planting is improved.

Drawings

FIG. 1 is a schematic view of the three-dimensional structure of the rape mulching and sowing machine for the rice stubble field of the present invention;

FIG. 2 is a schematic front view of FIG. 1;

FIG. 3 is a schematic view of a portion of the structure of FIG. 1;

FIG. 4 is a schematic view of the auger conveyor of FIG. 1.

In the figure, a front auxiliary frame 1, a transition gear box 2, a spring tooth pickup device 3, a spiral auger conveyor 4, a chain harrow conveying device 5, a conveying belt 6, a first front supporting rod 7, a front ditching plow 8, a rear ditching plow 9, a land wheel 10, a main frame 11, a rotary tillage soil preparation device 12, a front suspension frame combination 13, a rear suspension frame combination 14, a central gear box 15, a fertilizer box 16, a second front supporting rod 17, a front welding seat 18, an auger baffle plate 19, a seed sowing device 20, a window 21, a double-disc ditcher 22, a front beam 23, a rear beam 24, a right side beam 25, a left side beam 26, a middle beam 27, an auger side plate 28, an auger bottom plate 29, an upper pull rod 30, an L type suspension plate 31, an auger conveying shaft 32, a spiral blade 33, a circular baffle plate 34, a left output shaft 35, a gear 36, a right side 37, a guide sheet 38, a rear auxiliary frame 39, a front cross beam 40, a rear cross beam 41, a right side plate 42, a left side plate 43, a left side plate 44, a first rear supporting rod 45, a second rear supporting rod 46, a.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments.

As shown in figures 1 and 2 and combined with figure 3, the grass covering seeder for rape in rice stubble fields of the utility model comprises a straw covering and returning device and a seeder, wherein the straw covering and returning device is positioned at the front end of the seeder. The seeder comprises a main frame 11, a rear auxiliary frame 39 welded on the main frame 11, a rotary tillage and soil preparation device 12 welded on the front end of the main frame 11, two fertilizer seed boxes 16 symmetrically arranged in the middle of the main frame 11, a seed sowing device 20 arranged in the middle and rear part of the main frame 11, a plurality of sets of double-disc furrow openers 22 uniformly arranged at the rear end of the main frame 11, two front furrow plows 8 symmetrically arranged on two sides of the main frame 11, two rear furrow plows 9 symmetrically arranged on two sides of the main frame 11 and two land wheels 10. The main frame 11 comprises a front beam 40, a rear beam 41, a right side plate 42, a left side plate 43, a rear suspension frame assembly 14 and a pair of suspension rods 44, wherein the front beam 40, the rear beam 41, the right side plate 42 and the left side plate 43 enclose to form a rectangular frame, one end of each of the pair of suspension rods 44 is welded on the front beam 40, and the pair of suspension rods 44 are symmetrically arranged along the front beam 40; the rear suspension bracket assembly 14 comprises two first rear support rods 45 and two second rear support rods 46, wherein one ends of the two first rear support rods 45 are welded on the rear welding seat 47, the other ends of the two first rear support rods 45 are respectively welded on the pair of suspension rods 44 (namely one first rear support rod 45 is welded on one suspension rod 44), one ends of the two second rear support rods 46 are hinged on the rear welding seat 47, and the other ends of the two second rear support rods 46 are hinged on the rear cross beam 41; the rear sub-frame 39 includes a right side rod 48, a left side rod 49, and a cross bar 37, the right side rod 48 having one end fixed to the right side plate 42, the left side rod 49 having one end fixed to the left side plate 43, and the cross bar 37 being interposed between the right side rod 48 and the left side rod 49; the rotary tillage and soil preparation device 12 is mounted on the front beam 40, one front furrow plough 8 and one rear furrow plough 9 are mounted on the right side plate 42, and the other front furrow plough 8 and the other rear furrow plough 9 are mounted on the left side plate 43.

The straw covering and returning device comprises a front auxiliary frame 1, a transition gear box 2, a spiral auger conveyor 4, an elastic tooth pickup 3 which is rotatably arranged on the spiral auger conveyor 4, two sets of chain harrow conveying devices 5 and two sets of conveying belts 6; the two sets of chain harrow conveying devices 5 are symmetrically arranged at two sides of the screw conveyor 4, the two sets of conveying belts 6 are correspondingly arranged and connected with the two sets of chain harrow conveying devices 5 one by one, the conveying belts 6 are fixedly arranged on the rear auxiliary frame 39 and the main frame 11 and penetrate through the fertilizer seed box 16, and the spatial position of the seeder is reasonably utilized on the premise of no interference; in addition, the conveying belt 6 and the horizontal ground form an included angle of 3-5 degrees (preferably 4 degrees), and therefore straw scattering is facilitated. The straw covering and returning device can pick up scattered straws in the rice stubble field before rape seeding, provides a clean area for rape seeding, and has the function of returning the rice straws to the field after the seeding.

As shown in FIG. 3, the front sub-frame 1 comprises a front beam 23, a rear beam 24, a right side beam 25, a left side beam 26, two middle beams 27, a front suspension assembly 13 and a pair of L-type suspension plates 31, wherein the front beam 23, the rear beam 24, the right side beam 25 and the left side beam 26 are enclosed to form a rectangular frame, the two middle beams 27 are lined between the front beam 23 and the rear beam 24 in parallel (i.e. one end of each of the two middle beams 27 is welded to the front beam 23, and the other end of each of the two middle beams 27 is welded to the rear beam 24), a transition gear box 2 is mounted on the two middle beams 27, transverse plates of the pair of suspension plates 2 31 are fixedly welded to the rear beam 24, and the pair of suspension plates 31 are symmetrically arranged along the length direction of the rear beam 24, the front suspension assembly 13 comprises two first front support rods 7 and a second front support rod 17, one end of each of the two first front support rods 7 is fixed to the front welding seat 18, the other end of the two first front support rods 7 is fixed to the front welding seat 18, one end of the front support rod 17 is hinged to the front seat 18, and the front support rod is hinged to the front support rod 18, and the front support rod 18, the front support rod is hinged to the front suspension rod 9, the front suspension rod is hinged to the front suspension rod 9, the suspension rod.

Referring to fig. 4, the screw auger conveyor 4 includes an auger bottom plate 29, an auger baffle plate 19, two auger side plates 28, an auger conveying shaft 32, two helical blades 33 and a circular baffle plate 34, the auger bottom plate 29, the auger baffle plate 19 and the two auger side plates 28 enclose to form an open box, one auger side plate 28 is fixed on the left side beam 26, the other auger side plate 28 is fixed on the right side beam 25, two ends of the auger conveying shaft 32 are respectively fixed on the two auger side plates 28 through a bearing and a bearing seat (i.e. one end of the auger conveying shaft is fixed on one auger side plate through a bearing and a bearing seat, the other end of the auger conveying shaft is fixed on the other auger side plate through a bearing and a bearing seat), the circular baffle plate 34 passes through the auger conveying shaft 32 and is fixed at the center position of the auger conveying shaft 32 to separate the material, the tooth pickup device 3, the elastic tooth picker 3 comprises three rows of elastic teeth, the three rows of elastic teeth are uniformly distributed along the circumference, the operation range of the seeder is matched, the diameter of a cylinder of the elastic tooth picker 3 is 210-230 mm (preferably 220mm), the maximum picking width of the elastic tooth picker 3 is 1.8-2.2 m (preferably 2m), the length of each elastic tooth is 115-125 mm (preferably 120mm), the diameter of each elastic tooth is 4.5-5.5 (preferably 5mm), the distance between every two adjacent elastic teeth is 60-70 mm (65mm), the operation ground clearance of the elastic tooth picker is 28-32 mm (preferably 30mm), the elastic tooth picker can pick up straws efficiently, a return space is formed in the throwing and conveying process, no grass is wound, the elastic teeth cannot hit the auger bottom plate 29, the operation efficiency is high, and the picking effect is good; two helical blades 33 are symmetrically arranged on the auger conveying shaft 32 by taking a circular baffle 34 as a center.

In this embodiment, the two sides of the auger baffle 19 are both provided with the windows 21 through which the front ends of the chain rake cover housings of the chain rake conveying device 5 pass, and the two helical blades 33 are positioned between the inner side edges of the two windows 21, i.e. the helical blades 33 are not arranged on the auger conveying shaft 32 corresponding to the window 21, so that the material is conveniently pushed to the two sides of the auger conveying shaft, and the arc length of the window 21 in the length direction is 250-270 mm (preferably 260mm), which is the most effective arc length of material conveying, and the transportation of the material with the maximum efficiency can be realized. In addition, the auger conveying shaft corresponding to the window 21 is welded with the guide pieces 38, each guide piece 38 is 90-110 mm (preferably 100mm) long and 25-35 mm (preferably 30mm) high, each row is 2, and three rows are uniformly distributed on the auger conveying shaft 32 in the circumferential direction, so that the grass poking performance can be improved, and the lifting efficiency of the chain harrow can be improved.

The transition gear box 2 is fastened on two middle beams 27, the input end of the transition gear box 2 is connected with a transition shaft through a coupler, power is transmitted into the transition shaft through a universal joint by a tractor, and the rear output shaft of the transition gear box 2 is connected with the input end of the central gear box 15 through the universal joint, so that rotary tillage power is provided. A left output shaft 35 of the transition gear box 2 is fixed on the left side beam 26 through a vertical bearing seat, power is input into the elastic tooth pickup device 3 and the spiral auger conveyor 4 in two paths, the spiral auger conveyor 4 transmits the power to the chain harrow conveying device 5 through chain transmission, the chain harrow conveying device 5 transmits the power to the conveying belt 6 through the chain transmission, and a pair of gears 36 are arranged on the conveying belt 6 for reversing, so that the materials can be smoothly and quickly scattered on the ground surface.

The utility model discloses rice stubble field rape covers grass seeder, can pick up straw float grass through bullet tooth pickup 3 before the rape is live to throw auger delivery 4, simultaneously, to the earth's surface that does not contain the straw rotary tillage soil preparation, the ditching, and fertilize, sow, the straw float grass of throwing auger delivery 4 pushes away the port that both sides correspond chain harrow conveyor 5 through helical blade rapidly, chain harrow conveyor 5 lifts up straw float grass and falls on conveyer belt 6, through the transportation, evenly spill the earth's surface, cover on the railway carriage or compartment face after the seeding, cover still field straw float grass after the seeding, can accomplish straw float grass simultaneously and pick up in one operation, carry, the back is thrown, the rotary tillage, the stubble-cleaning, the ditching, fertilize, sow, process such as covering the straw, both can be in the dry land operation, also can be in the operation of the more ground condition of straw float grass, can realize the effective still field utilization of straw resource, the utilization rate of the rape planting fertilizer is improved.

Claims

1. A grass covering seeder for rape in rice stubble fields comprises a straw covering and returning device and a seeder, wherein the straw covering and returning device is positioned at the front end of the seeder; the seeder comprises a main frame (11), a rotary tillage and soil preparation device (12) welded on the front end of the main frame (11), two fertilizer seed boxes (16) symmetrically arranged in the middle of the main frame (11), a seed metering device (20) arranged in the middle and rear part of the main frame (11), a plurality of sets of double-disc furrow openers (22) uniformly arranged at the rear end of the main frame (11), two front furrow plows (8) symmetrically arranged on two sides of the main frame (11), two rear furrow plows (9) symmetrically arranged on two sides of the main frame (11) and two land wheels (10); the method is characterized in that: the straw mulching and returning device comprises a front auxiliary frame (1), a spiral auger conveyor (4), a spring tooth pickup device (3) which is rotatably arranged on the spiral auger conveyor (4), two sets of chain harrow conveying devices (5) and two sets of conveying belts (6); the two sets of chain harrow conveying devices (5) are symmetrically arranged at two sides of the spiral auger conveyor (4), and the two sets of conveying belts (6) are correspondingly arranged and connected with the two sets of chain harrow conveying devices (5) one by one;

the main frame (11) comprises a front cross beam (40), a rear cross beam (41), a right side plate (42), a left side plate (43), a rear suspension frame assembly (14) and a pair of suspension rods (44), wherein the front cross beam (40), the rear cross beam (41), the right side plate (42) and the left side plate (43) are enclosed to form a rectangular frame, one end of each suspension rod (44) is welded on the front cross beam (40), the suspension rods (44) are symmetrically arranged along the front cross beam (40), the front sub frame (1) comprises a front beam (23), a rear beam (24), a right side beam (25), a left side beam (26), a front suspension frame assembly (13) and a pair of L type suspension plates (31), the front beam (23), the rear beam (24), the right side beam (25) and the left side beam (26) are enclosed to form a rectangular frame, transverse plates of the pair of L type suspension plates (31) are fixedly welded on the rear beam (24), the pair of L type suspension plates (31) are symmetrically arranged along the length direction of the rear beam (24), the suspension plates (31) are connected with the suspension plates (31) through a plurality of suspension rods (54), the suspension rods (31) are arranged corresponding to the suspension plates, bolts, and the suspension plates (31) are hinged to the suspension plates (31), and the suspension plates (31) are arranged corresponding to the suspension plates (54).

2. The covering and sowing machine for rape in rice stubble fields as claimed in claim 1, wherein: the front suspension bracket assembly (13) comprises two first front support rods (7) and two second front support rods (17), one ends of the two first front support rods (7) are fixed on the front welding seat (18), the other ends of the two first front support rods (7) are fixed on the front beam (23), one ends of the two second front support rods (17) are hinged on the front welding seat (18), and the other ends of the two second front support rods (17) are hinged on the rear beam (24); the rear suspension bracket combination (14) comprises two first rear support rods (45) and two second rear support rods (46), one ends of the two first rear support rods (45) are welded on a rear welding seat (47), the other ends of the two first rear support rods (45) are respectively welded on a pair of suspension rods (44), one ends of the two second rear support rods (46) are hinged on the rear welding seat (47), and the other ends of the two second rear support rods (46) are hinged on a rear cross beam (41); one end of the upper pull rod (30) is hinged to a front shaft of a front welding seat (18) of the front auxiliary frame (1), and the other end of the upper pull rod (30) is hinged to a rear shaft of a rear welding seat (47) of the main frame (11).

3. The covering and sowing machine for rape in rice stubble fields as claimed in claim 1, wherein: the auger conveyor (4) comprises an auger bottom plate (29), an auger baffle (19), two auger side plates (28), an auger conveying shaft (32), two helical blades (33) and a round baffle (34), the auger bottom plate (29), the auger baffle (19) and the two auger side plates (28) enclose to form an open box body, and one the auger side plate (28) is fixed on a left side beam (26), another the auger side plate (28) is fixed on a right side beam (25), the two ends of the auger conveying shaft (32) are respectively fixed on the two auger side plates (28) through a bearing and a bearing seat, the round baffle (34) penetrates the auger conveying shaft (32) to be fixed at the central position of the auger conveying shaft (32), and the helical blades (33) are symmetrically distributed and are arranged on the auger conveying shaft (32) by taking the round baffle (34) as the center, the elastic tooth pickup (3) is rotatably arranged on the packing auger bottom plate (29).

4. The rice stubble field rape mulching seeder as claimed in claim 3, wherein: the elastic tooth picker (3) comprises three rows of elastic teeth which are uniformly distributed along the circumference; the diameter of a cylinder of the elastic tooth picker (3) is 210-230 mm, the maximum picking width of the elastic tooth picker (3) is 1.8-2.2 m, the length of each elastic tooth is 115-125 mm, the diameter of each elastic tooth is 4.5-5.5, the distance between every two adjacent elastic teeth is 60-70 mm, and the height of the elastic tooth picker above the ground during operation is 28-32 mm.

5. The rice stubble field rape mulching seeder as claimed in claim 3, wherein: two sides of the auger baffle (19) are provided with windows (21) for the front ends of chain harrow housings of the chain harrow conveying device (5) to pass through, two helical blades (33) are positioned between the inner sides of the two windows (21), and the arc length of the window (21) in the length direction is 250-270 mm; in addition, guide pieces (38) are welded on the auger conveying shaft opposite to the window (21), each guide piece (38) is 90-110 mm long and 25-35 mm high, two guide pieces (38) in each row are uniformly distributed on the auger conveying shaft (32) in the circumferential direction in total of three rows.

6. The covering and sowing machine for rape in rice stubble fields as claimed in claim 1, wherein: the seeder also comprises a rear auxiliary frame (39) welded on the main frame (11), the rear auxiliary frame (39) comprises a right side rod (48), a left side rod (49) and a cross rod (37), one end of the left side rod (49) is fixed on the right side plate (42), one end of the right side rod (48) is fixed on the left side plate (43), and the cross rod (37) is lined between the right side rod (48) and the left side rod (49); the rotary tillage and soil preparation device (12) is arranged on a front beam (40), one front furrow plough (8) and one rear furrow plough (9) are arranged on a right side plate (42), and the other front furrow plough (8) and the other rear furrow plough (9) are arranged on a left side plate (43).

7. The covering and sowing machine for rape in rice stubble fields as claimed in claim 1, wherein: the conveying belt (6) and the horizontal ground form an included angle of 3-5 degrees.

8. The covering and sowing machine for rape in rice stubble fields as claimed in claim 1, wherein: straw covers still field device and includes transition gear box (2), the input of transition gear box (2) passes through the shaft coupling and links to each other with the tractor, the back output shaft and central gear box (15) input of transition gear box (2) are connected, the power of transition gear box (2) left side output shaft (35) divides two tunnel to be input respectively to bullet tooth pickup (3) and spiral auger conveyer (4), spiral auger conveyer (4) are through chain drive with power transmission to chain harrow conveyor (5), chain harrow conveyor (5) are through chain drive with power transmission to conveyer belt (6).