A two-way gridding high-speed stubble cutting and stalk cutting operation device and operation method

Abstract

The application discloses a bidirectional meshed high-speed stubble cutting and stalk cutting operation device and operation method, and belongs to the field of agricultural machinery. The operation device comprises a main frame, a transverse stubble cutting operation assembly and a longitudinal stubble cutting operation assembly; the front and rear cutter roll seats of the transverse stubble cutting operation assembly are provided with cutting blades, and the cutting blades are installed at an angle with the cutter roll axis; the longitudinal stubble cutting operation assembly comprises a corrugated cutter head with a corrugated circumferential contour and a stalk cutting gap structure. During operation, the transverse stubble cutting operation assembly performs two-stage progressive transverse cutting on stubble head and longitudinally distributed stalks, the longitudinal stubble cutting operation assembly performs longitudinal cutting on stubble bottom and transversely distributed stalks, and the two form bidirectional meshed cutting tracks on the ground. The application effectively makes up for the missed cutting area of single direction cutting, eliminates the cutting blind area, and the stubble removal rate reaches 92.4% and the stalk cutting rate reaches 91.8% at an operation speed of 12 km / h, and is suitable for high-speed stalks returning to the field operation scene.

Description

Technical Field

[0001] This invention relates to a two-way gridded high-speed stubble breaking and stalk cutting device and method, belonging to the field of agricultural machinery and equipment. Background Technology

[0002] The corn stalk full-scale harrowing and mixing return to the field tillage technique refers to a tillage technique where, after corn harvesting, the stalks covering the ground are mixed with the soil through deep plowing, resulting in a surface stalk coverage rate of no more than 30%. This technique combines surface stalk covering with mixed burial of stalks into the topsoil through mechanized operations, effectively solving problems such as slow soil temperature rise, low seeder mobility, and poor seedling quality in cold regions. The core operational steps are: after autumn harvesting, a disc tillage machine or a combined harrowing and loosening tillage machine is used to till the entire field, chopping and burying a large amount of stalks and root stubble into the soil, with the remaining stalks covering the surface.

[0003] In the existing technology, disc harrow tillage machines (such as the terrain-adaptive seedbed tillage machine mentioned in patent 202521546641.7) can complete multiple operations such as straw and stubble chopping and soil compaction as supporting equipment. Its main stubble-cutting component is the disc harrow blade, which cuts straw and stubble by longitudinally and alternately rolling the blade, realizing a series of operations such as tillage, straw chopping, soil and straw mixing, and deep burial in one pass. Loosening and harrowing combined tillage machines (such as the corn straw full-volume return tillage machine mentioned in patent 202111549810.9) integrate deep loosening, harrowing and soil crushing. It is mainly composed of a grass-cutting device, an arc-shaped deep loosening shovel and a disc harrow assembly, and has the advantages of high operating efficiency and energy saving.

[0004] However, in actual operation, due to the fixed lateral spacing of the rake blades in the axial direction of the cutter roller, the area between adjacent rake blades becomes a cutting blind zone. A large amount of stubble and long straw on the ground slips through the gaps between the rake blades without being cut. This missed cutting phenomenon directly leads to the problem of incomplete stubble breaking and poor straw cutting effect. After the operation, a large amount of uncut stubble and long straw remain on the ground, which seriously affects the machine's passability and sowing quality in subsequent sowing operations.

[0005] Therefore, there is an urgent need in this field to develop a stubble cutting technology that can eliminate the cutting blind spots caused by the lateral spacing of the harrow blades and achieve full cutting of stubble and straw under high-speed operation conditions, so as to make up for the technical shortcomings of the existing disc harrow tillage machine in missing stubble cutting. Summary of the Invention

[0006] In view of this, the present invention addresses the problems of incomplete stubble breaking and poor straw cutting effect during the full-scale harrowing and mixing of corn stalks into the field during tillage and preparation. It provides a two-way gridded high-speed stubble breaking and straw cutting device and method, which can significantly improve the operation effect of corn stubble breaking and straw cutting, thereby solving the above-mentioned problems in the prior art.

[0007] One of the technical solutions of the present invention to solve the above-mentioned technical problems is a two-way gridded high-speed stubble breaking and stalk cutting device, including a main frame, a transverse stubble cutting assembly and a longitudinal stubble cutting assembly respectively installed on the main frame; The transverse cutting assembly includes a front cutter roller seat and a rear cutter roller seat. A front cutting blade is mounted on the front cutter roller seat, and a rear cutting blade is mounted on the rear cutter roller seat. The front cutting blade and the rear cutting blade are installed at an angle to the axis of their respective cutter rollers. The longitudinal stubble cutting assembly includes a corrugated cutter head, which has a corrugated circumferential profile and a stalk cutting notch structure.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the main frame includes a towing frame, a front suspension frame, a rear support, a depth adjustment mechanism, a hydraulic cylinder, and a ground wheel. The working speed of this device is above 10 km / h, the working depth h is 20 to 150 mm, and the working width W is 1000 to 2000 mm. The transverse shaving assembly is mounted on the front suspension frame, and the longitudinal shaving assembly is mounted on the rear support. The traction frame is connected to the rear support via a screw and a pin. The front suspension frame is fixed to the rear support via a U-shaped clamp. The depth adjustment mechanism adjusts the height of the ground wheel relative to the rear support via a hydraulic cylinder.

[0010] Furthermore, the transverse cutting assembly also includes a fixed base, an adjusting plate, and a transverse bearing housing; The fixed seat is connected to the front suspension frame. The fixed seat is connected to the adjustment plate by bolts. The adjustment plate is provided with a center hole and multiple adjustment holes for adjusting the working depth of the transverse cutting assembly. The front cutter roller seat and the rear cutter roller seat are connected to the adjustment plate by transverse bearing seats and bolts.

[0011] Furthermore, the longitudinal cutting assembly is divided into a left longitudinal cutting assembly and a right longitudinal cutting assembly. The left longitudinal cutting assembly and the right longitudinal cutting assembly have the same structure, including a front vertical shaft, a front axle seat, a front beam, a bent plate support, a bent handle, a scraper baffle, a connecting shaft, a limiting plate, a corrugated cutter head, a double-ended screw, a fixed support, a fixed screw, a rear vertical shaft, a rear axle seat, a rear beam, a scraper beam, a scraper blade, and a longitudinal bearing seat. The front axle seat is connected to the rear bracket via the front vertical shaft, and the rear axle seat is connected to the rear bracket via the rear vertical shaft. The front axle seat and the rear axle seat are welded to the front beam and the rear beam, respectively. The bent plate support connects the front beam and the rear beam, and the bent shank connects the bent plate support and the longitudinal bearing seat. The connecting shaft passes between the longitudinal bearing seats. A limit plate and a corrugated cutter head are installed on the connecting shaft. The spacing between adjacent corrugated cutter heads is 180-220mm. The scraping beam is fixed to the bent shank. The scraping beam is equipped with a scraping folding plate and a scraping blade. The double-ended lead screw and the fixed lead screw are installed between the front beam and the rear beam. The working angle adjustment range is 0°-12°.

[0012] The specific operating procedure for adjusting the angle of the longitudinal cutting assembly is as follows: Taking the left longitudinal cutting assembly as an example, by controlling the length of the double-ended screw, one end of the double-ended screw is fixed to the main frame with a U-shaped clamp, and the other end of the double-ended screw forces the front beam to rotate relative to the front axle seat. The rotation point is Z1. The rotation of the front beam causes one end of the fixed screw to move simultaneously, and the other end of the fixed screw drives the rear beam to rotate relative to the rear axle seat. The rotation point is Z2, thus forming a working angle F1 between the front beam and the rear beam. The working angle F2 of the right longitudinal cutting assembly is adjusted in the same way as the left longitudinal cutting assembly. The working angle F2 is adjusted by controlling the installation length of the double-ended screw. The rotation point of the front beam position is Z3, and the rotation point of the rear beam position is Z4. The adjustment range of the working angle F1 is 0° to 12°, and the adjustment range of the working angle F2 is 0° to 12°.

[0013] Furthermore, the corrugated cutter head has two features: a stalk cutting notch structure and a corrugated structure. The notch shape consists of an arc segment from point B0 to B1 and a broken line segment from point B1 to B5. The arc segment from point B0 to B1 serves as a guide arc to fix the straw on the ground. The radius R of the guide arc of the stalk cutting notch structure is related to the diameter of the cross-section of the straw on the ground, and the range is 40-60mm. The apex at point B4 is used to cut into the inside of the straw, which helps to break the straw. The angle b between line segment B3-B4 and line segment B4-B5 is 45°-60°. The cross-section of the broken line segment B3-B4-B5 is a wedge structure to reduce the cutting resistance during operation. The wedge angle c is 30°-90°. The notch length P1 is 160-220mm, and the notch apex length P2 is 100-150mm. The cross-sectional outline curve of the corrugated cutter head is a sine function y=Asinx, where A is 20~50mm.

[0014] Furthermore, the front cutter roller seat is evenly provided with 6 front cutting blades along the circumference and 3 sets along the axial direction. The middle set and the side set are staggered and the spacing between the sets is 350-850mm. The outer circumference diameter D1 of the front cutter roller seat after the front cutting blades are installed is 400-700mm. The installation angle G1 between the front cutting blades and the axis is 6°-12°. The rear cutter roller seat has 6 rear cutting blades evenly arranged circumferentially and 3 groups arranged axially. The middle group and the side group are staggered and the spacing between the groups is 350-850mm. The outer circumference diameter D2 of the rear cutter roller seat after the rear cutting blades are installed is 300-400mm. The installation angle G2 between the rear cutting blades and the axis is 3°-6°.

[0015] The working principle of this operating device is as follows: During operation, the front and rear cutter roller seats are passively rotated at high speed under the drive of the unit. The installed front and rear cutting blades perform rolling impact and shearing on the stubble and straw. Because the blades are installed at an angle relative to the central axis of the cutter roller, the blade edges contact the straw at an inclined state, changing the cutting method from vertical chopping to a combination of sliding cutting and stretching, increasing the effective cutting line length. At the same time, the axial component force generated pushes the cut straw and stubble to flow orderly along the axial direction of the cutter roller, avoiding entanglement and accumulation. The front and rear cutter roller seats each have 3 sets of blades arranged axially with staggered spacing, so that the cutting trajectories of the two rollers intersect and complement each other, eliminating transverse missed cutting areas. The longitudinal stubble cutting assembly uses the linkage adjustment of the double-headed lead screw and the fixed lead screw to make the front beam rotate around the front axle seat and the rear beam rotate around the rear axle seat, forming an adjustable working angle of 0° to 12°. The corrugated cutter head installed on the connecting shaft cuts the bottom of the horizontally remaining straw and stubble at a certain tilt angle. Its corrugated circumferential contour generates a continuous wave-like cutting trajectory when rotating, which intersects with the cutting trajectory of the transverse stubble cutting assembly, forming a two-way grid-like cut on the ground surface, ensuring that straw and stubble distributed in any direction are effectively cut. At the same time, by increasing the working angle of the longitudinal stubble cutting assembly, the soil can be disturbed appropriately to promote the mixing of straw and soil.

[0016] The beneficial effects of this device are: 1. The transverse shaving assembly of the working device of the present invention adopts a double-roller staggered arrangement structure of front cutter roller seat and rear cutter roller seat. The front cutter roller and the rear cutter roller each have 6 cutting blades evenly distributed along the circumference and 3 sets arranged axially with staggered arrangement between the sets, so that the cutting trajectories of the two rollers complement each other, eliminate the cutting blind zone caused by the axial spacing of the blades, and greatly improve the shaving density and uniformity in the width direction. At the same time, the symmetrically distributed cutting force effectively reduces the dynamic imbalance when the cutter roller rotates at high speed. 2. The front cutting blade is installed at an angle of 6° to 12° with the central axis, and the rear cutting blade is installed at an angle of 3° to 6°. This changes the cutting method from vertical cutting to a combination of sliding cutting and stretching, increasing the cutting line length. At the same time, the axial force generated pushes the cut straw and stubble to flow along the axis of the cutter roller, avoiding the accumulation and entanglement of straw in local areas of the cutter roller and improving the smoothness of stubble discharge. 3. The longitudinal cutting assembly can be adjusted by the linkage between the double-headed screw and the fixed screw, so that the left and right longitudinal cutting assemblies can independently form an adjustable working angle of 0° to 12°. The front beam and the rear beam rotate around their respective axles to realize the adjustment of the cutting angle of the longitudinal cutting assembly. The soil disturbance effect is improved by increasing the working angle. 4. The corrugated cutter head has two features: a stalk cutting notch structure and a corrugated structure. The guide arc in the stalk cutting notch can effectively fix the straw on the ground inside the notch, and the sharp point cuts into the straw to achieve breaking. The wedge-shaped cross section significantly reduces cutting resistance. The corrugated circumferential contour forms a continuous wave-like cutting trajectory when rotating, increasing the cutting frequency of straw per unit time and greatly improving the ability to cut stubble and straw. 5. The working components of both the transverse and longitudinal stubble cutting assemblies adopt a passive rolling cutting method, with an operating speed of over 10 km / h. Tests have verified that, at an operating speed of 12 km / h and a depth of 50 mm, the stubble removal rate of the bidirectional grid cutting method is 92.4%, the straw cutting rate is 91.8%, and the soil disturbance coefficient is 90.2%. The results show that the bidirectional grid cutting method has significantly better cutting effect and efficiency in terms of root stubble and straw, soil disturbance, and operation than the transverse and longitudinal cutting methods alone.

[0017] Another technical solution of the present invention is a method for operating a bidirectional gridded high-speed stubble-breaking and straw-cutting device, comprising the following steps: After autumn mechanical harvesting, the stubble height should be ≤150mm and the surface straw length should be ≤800mm. The harvested straw should be evenly covered on the ground. A two-way gridded high-speed stubble cutting device should be used to perform gridded cutting of the stubble and surface straw with two-way cutting lines. The working width W of the cutting line is 1000-2000mm, of which there are two transverse cutting lines and one longitudinal cutting line.

[0018] Based on the above technical solution, the present invention can be further improved as follows.

[0019] Furthermore, the horizontal cutting lines are cutting line 1 and cutting line 2, and the vertical cutting line is cutting line 3; Cutting line 1 is used to make preliminary cuts on the root head and the longitudinally distributed long straw. The cutting line height H1 is 100-200mm, the deflection angle a1 is 6°-12°, and the distance K1 between two adjacent cutting lines is 100-200mm. Cutting line 2 is used to make a fine cut on the root head and the longitudinally distributed long straw. The cutting line height H2 is 50-100mm, the deflection angle a2 is 3°-6°, and the distance K2 between two adjacent cutting lines is 50-100mm. Cutting line No. 3 cuts the bottom of the stubble and the long straw distributed laterally. The cutting line has a corrugated structure with a wavelength H3 of 50-100mm and a wave height a3 of 30-60mm. The cutting angle of cutting line No. 3 is adjustable, with an adjustment range of 0° to 6°, which can improve the stubble cutting effect while increasing the soil disturbance effect.

[0020] Furthermore, the distance K1 between two adjacent No. 1 cutting lines is twice the distance K2 between two adjacent No. 2 cutting lines.

[0021] Furthermore, the cutting line has a working width W of 1300mm, a working depth of 20-150mm, and a working speed of ≥10km / h.

[0022] The operating principle is as follows: Based on the spatial distribution characteristics of stubble and surface straw, the cutting operation is decomposed into two orthogonal directions, horizontal and vertical, forming a grid-like cutting path. In the direction of the machine's advance, two horizontal cutting lines with decreasing height and angle are used to perform two-stage progressive horizontal cutting on the head of the stubble and the long straw distributed vertically: Cutting line 1 performs coarse cutting at a higher position and a larger angle, while cutting line 2 performs fine cutting at a lower position and a smaller angle, so that the stubble is cut off from the base of the stem and its consolidation with the soil is broken. At the same time, the straw distributed vertically is cut. Then, the longitudinal cutting line with a corrugated structure is used to cut the bottom of the stubble and the long straw distributed horizontally in the direction perpendicular to the direction of the machine's advance, and intersects with the previous horizontal cutting trajectory to form a complete closed grid-like cutting surface in the straw cover layer and stubble area. This ensures that the stubble and long straw are fully cut in both horizontal and vertical directions, thereby making up for the missed areas in single-direction cutting and achieving efficient crushing of stubble and straw across the entire width. Beneficial effects

[0023] 1. The operation method is to set up two-level bidirectional cutting lines in the horizontal and vertical directions to form a complete closed grid cutting path on the ground surface, which effectively makes up for the missed areas caused by single-direction cutting and solves the problem of incomplete root and stubble breaking and long straw residue on the ground surface caused by the horizontal spacing of the rake blades in the disc harrow tillage machine. 2. The transverse cutting line adopts a progressive design in terms of height and angle, first coarse cutting and then fine cutting. The longitudinal cutting line adopts a corrugated structure and the cutting angle can be adjusted. The three-level cutting lines work together to achieve efficient cutting of stubble and straw under high-speed operation conditions. Attached Figure Description

[0024] Figure 1 This describes the surface conditions before the operation of this invention. Figure 2 This is the type of cutting line in this invention; Figure 3 This is the process of making a transverse cutting line according to the present invention; Figure 4 This is the longitudinal cutting line operation process of the present invention; Figure 5 This is a view of the cutting line assembly of the present invention; Figure 6 This is a diagram illustrating the operational effect of the invention. Figure 7 This is a three-dimensional structural schematic diagram of the bidirectional gridded high-speed stubble-breaking and straw-cutting device of the present invention; Figure 8 This is a side view of the bidirectional gridded high-speed stubble-breaking and straw-cutting device of the present invention; Figure 9 This is a top view of the bidirectional gridded high-speed stubble-breaking and straw-cutting device of the present invention; Figure 10 This is a three-dimensional structural diagram of the main frame in this invention; Figure 11 This is a working component of the bidirectional gridded high-speed stubble-breaking and straw-cutting device of the present invention; Figure 12 This is a three-dimensional structural diagram of the transverse cutting assembly of the present invention; Figure 13 This is a side view of the transverse shaving assembly of the present invention; Figure 14 This is a top view of the transverse shaving assembly of the present invention; Figure 15 This is a partial structural schematic diagram of the transverse cutting assembly of the present invention; Figure 16 This is a three-dimensional structural diagram of the longitudinal shaving assembly of the present invention; Figure 17 This is a partial structural schematic diagram of the longitudinal shaving assembly of the present invention; Figure 18 This is a top view of the longitudinal shaving assembly of the present invention; Figure 19 This is a schematic diagram of the angle adjustment of the longitudinal shaving assembly of the present invention; Figure 20 This is a front view of the corrugated cutter head of the present invention; Figure 21 This is a top view of the corrugated cutter head of the present invention; Figure 22 This invention relates to a corrugated blade disc for cutting stalks with a notch. Figure 23 This refers to the outer contour curve of the corrugated cross section of the present invention.

[0025] The attached diagram lists the components represented by each number as follows: 1. Main frame; 101. Traction frame; 102. Front suspension frame; 103. Rear support; 104. Depth adjustment mechanism; 105. Hydraulic cylinder; 106. Ground wheel; 2. Transverse shaving assembly; 201. Fixed base; 202. Adjusting plate; 203. Front cutter roller seat; 204. Front cutting blade; 205. Rear cutter roller seat; 206. Rear cutting blade; 207. Transverse bearing seat; 3. Longitudinal cutting assembly; 301. Front vertical shaft; 302. Front shaft seat; 303. Front beam; 304. Bend plate support; 305. Bend handle; 306. Scraper blade; 307. Connecting shaft; 308. Limiting plate; 309. Corrugated cutter head; 310. Double-ended lead screw; 311. Fixed support; 312. Fixed lead screw; 313. Rear vertical shaft; 314. Rear shaft seat; 315. Rear beam; 316. Scraper beam; 317. Scraper blade; 318. Longitudinal bearing seat; W: Working width; L1: Narrow spacing; L2: Wide spacing; K1: Distance between two adjacent No. 1 cutting lines; K2: Distance between two adjacent No. 2 cutting lines; K3: Distance between two adjacent No. 3 cutting lines; H1: Line height of No. 1 cutting line; a1: Deflection angle of No. 1 cutting line; H2: Line height of No. 2 cutting line; a2: Deflection angle of No. 2 cutting line; H3: Wavelength of No. 3 cutting line; a3: Wave height of No. 3 cutting line; h: Working depth; D1: Outer circumference of the front cutting blade. Diameter; D2, outer circumference diameter of the rear cutting blade; G1, installation angle of the front cutting blade; G2, installation angle of the rear cutting blade; F1, working angle of the left longitudinal cutting assembly; F2, working angle of the right longitudinal cutting assembly; Z1, rotation point of the left front beam; Z2, rotation point of the left rear beam; Z3, rotation point of the right front beam; Z4, rotation point of the right rear beam; R, radius of the arc; b, notch angle; c, notch wedge angle; P1, notch length; P2, notch tip length; A, amplitude. Detailed Implementation

[0027] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0028] Example 1 The two-way gridded high-speed stubble cutting method includes the following steps: S1. After autumn mechanical harvesting, the stubble height should be ≤150mm, the straw length on the ground should be ≤800mm, and the harvested straw should be evenly covered on the ground. S2. A grid-like cutting operation is carried out on the stubble and long straw on the ground using bidirectional cutting lines. The working width W of the cutting lines is 1300mm. Cutting lines 1 and 2 are transverse cutting lines, and cutting line 3 is a longitudinal cutting line. Cutting line 1 mainly performs preliminary cutting on the head of the stubble and the longitudinally distributed long straw. The cutting line height H1 is 150mm, the deflection angle a1 is 10°, and the distance K1 between two adjacent cutting lines is 120mm. Cutting line 2 mainly performs fine cutting on the head of the stubble and the longitudinally distributed long straw. The cutting line height H2 is 75mm, the deflection angle a2 is 5°, and the distance K2 between two adjacent cutting lines is 60mm. Cutting line 3 mainly cuts the bottom of the stubble and the transversely distributed long straw. The cutting line has a corrugated structure, the wavelength H3 is 60mm, and the wave height a3 is 45mm. The cutting angle of cutting line No. 3 is adjustable, with an adjustment angle of 0°, a cutting depth of 50mm, and a cutting speed of 12km / h.

[0029] The bidirectional grid-type high-speed stubble breaking and stalk cutting device includes: a main frame 1, a transverse stubble cutting assembly 2 and a longitudinal stubble cutting assembly 3. The device has a working speed of 12km / h, a working depth h of 50mm, and a working width W of 1300mm. The main frame 1 consists of a traction frame 101, a front suspension frame 102, a rear support frame 103, a depth adjustment mechanism 104, a hydraulic cylinder 105, and a ground wheel 106. The traction frame 101 is connected to the rear support frame 103 by using a lead screw and a pin. The front suspension frame 102 is fixed to the rear support frame 103 by using a U-shaped clamp. The depth adjustment mechanism 104 is adjusted by adjusting the length of the hydraulic cylinder 105 to change the height of the ground wheel 106 relative to the rear support frame 103, thereby controlling the working depth h of the transverse shaving assembly 2 and the longitudinal shaving assembly 3. The transverse shaving assembly 2 consists of a fixed base 201, an adjusting plate 202, a front cutter roller seat 203, a front cutting blade 204, a rear cutter roller seat 205, a rear cutting blade 206, and a transverse bearing seat 207. The fixed base 201 is connected to the front suspension frame 102 of the main frame 1 by bolts. The fixed base 201 and the adjusting plate 202 are connected by two bolts. The adjusting plate 202 has one center hole and multiple adjusting holes. The working depth of the transverse shaving assembly 2 is adjusted by rotating around the center hole. The relative position of the transverse shaving assembly 2 and the front suspension frame 102 is fixed by bolts. The working depth of the transverse shaving assembly 2 is set individually. The front cutter roller seat 203 and the rear cutter roller seat 205 are connected to the adjusting plate 202 by bolts through the transverse bearing seat 207. The front cutting blade 204 is connected to the front cutter roller seat 203 by bolts. The rear cutting blade 206 is connected to the rear cutter roller seat 205 by bolts. The front cutter roller seat 203 uses bolts to mount the front cutting blades 204. Six are evenly arranged along the circumference of the circular tube, and three groups are arranged along the axial direction of the circular tube. The front cutting blades 204 in the middle group are staggered relative to the front cutting blades 204 in the side groups. The spacing between the groups is 500mm. The front cutting blades 204 have mounting holes for mounting the blades. The diameter of the mounting holes is 13mm, and the longitudinal spacing between adjacent mounting holes is 25mm. This is used for fine adjustment of the working depth of the front cutting blades 204. The outer circumference diameter D1 of the front cutter roller seat 203 after mounting the front cutting blades 204 is 600mm. An installation angle G1 of 8° is provided between the front cutting blade 204 and the axis of the central shaft. The rear cutter roller seat 205 is equipped with rear cutting blades 206 by bolts. Six blades are evenly arranged along the circumference of the circular tube and three groups are arranged along the axial direction of the circular tube. The rear cutting blades 206 in the middle group are staggered relative to the rear cutting blades 206 in the side groups. The spacing between the groups is 500mm. The outer circumference diameter D2 of the rear cutter roller seat 205 after the rear cutting blades 206 are installed is 350mm. The back cutting blade 206 is provided with an installation angle between itself and the axis of the central shaft, and the installation angle G2 is 4°. The longitudinal shaving assembly 3 is divided into a left longitudinal shaving assembly and a right longitudinal shaving assembly. It is fixed to the rear bracket 103 of the main frame 1 using bolts and U-shaped clamps. The left and right longitudinal shaving assemblies have the same structural composition and adjustment method. Taking the left longitudinal shaving assembly as an example, it mainly consists of a front vertical shaft 301, a front axle seat 302, a front beam 303, a bend plate support 304, a bend handle 305, a scraper baffle 306, a connecting shaft 307, a limiting plate 308, a corrugated cutter head 309, a double-ended lead screw 310, and a fixed support 31. 1. The system comprises a fixed lead screw 312, a rear vertical shaft 313, a rear axle seat 314, a rear beam 315, a scraper beam 316, a scraper blade 317, and a longitudinal bearing seat 318. The front axle seat 302 is connected to the rear support 103 of the main frame 1 via the front vertical shaft 301 and a hexagonal slotted nut. The rear axle seat 314 is connected to the rear support 103 of the main frame 1 via the rear vertical shaft 313 and a hexagonal slotted nut. The fixed support 311 is fixed to the rear support 103 of the main frame 1 via a U-shaped clamp. The front axle seat 302 and the rear axle seat 314 are respectively welded to the front... Beam 303 and rear beam 315, and the curved plate support 304 are respectively connected to the front beam 303 and rear beam 315 by bolts. The curved handle 305 is fixed to the curved plate support 304 by bolts, and the curved handle 305 is fixed to the longitudinal bearing seat 318 by bolts. The connecting shaft 307 passes between the two longitudinal bearing seats 318. Limiting plates 308 and corrugated cutter heads 309 are installed at equal intervals on the connecting shaft 307, with a spacing of 200mm between adjacent corrugated cutter heads 309. The scraping beam 316 is fixed to the curved handle 305 by bolts. A U-shaped... The scraper baffle 306 and scraper blade 317 are installed at equal intervals with clamps. The scraper baffle 306 is installed at the position where the longitudinal bearing seat 318 is located, and the scraper blade 317 is installed at the other positions. The double-ended screw 310 is installed between the front beam 303 and the rear beam 315 by bolts. The angle of the longitudinal cutting assembly 3 is adjusted by the installation length of the double-ended screw 310. The fixed screw 312 is installed between the front beam 303 and the rear beam 315 by bolts. The angle of the longitudinal cutting assembly 3 is adjusted by the double-ended screw 310. The angle adjustment operation procedure of the longitudinal cutting assembly 3 is as follows: Taking the left longitudinal cutting assembly as an example, by controlling the length of the double-ended screw 310, one end of the double-ended screw 310 is fixed to the main frame 1 by the fixed support 311 through a U-shaped clamp. The other end of the double-ended screw 310 forces the front beam 303 to rotate relative to the front axle seat 302. The rotation point is Z1. The rotation of the front beam 303 causes one end of the fixed screw 312 to move at the same time. The other end of the fixed screw 312 drives the rear beam 315 to rotate relative to the rear axle seat 314. The rotation point is Z2. This makes the working angle F1 between the front beam 303 and the rear beam 315 form. The working angle F2 of the right longitudinal cutting assembly is adjusted in the same way as the left longitudinal cutting assembly. The working angle F2 is adjusted by controlling the installation length of the double-ended screw 310. The rotation point of the front beam position is Z3, and the rotation point of the rear beam position is Z4. Working angle F1, angle adjustment to 0°; Working angle F2, angle adjustment to 0°; The corrugated cutter head 309 features both a stalk cutting notch structure and a corrugated structure. The stalk cutting notch structure consists of an arc segment from point B0 to B1 and a broken line segment from point B1 to B5. The arc segment from B0 to B1 serves as a guide arc to fix the surface straw, and the radius R is related to the diameter of the surface straw cross-section, with a value of 50mm. The apex at point B4 is used to penetrate the straw, aiding in its breaking. The angle b between line segments B3-B4 and B4-B5 is 50°. The cross-section of the broken line segment B3-B4-B5 is wedge-shaped to reduce cutting resistance during operation, with a wedge angle c of 45°. The notch length P1 is 180mm, and the notch apex length P2 is 120mm. The corrugated structure refers to the corrugated profile of the corrugated cutter head 309 being set as corrugated. The outer contour curve of the corrugated cross section is a sinusoidal function, and the equation of the outer contour curve is: y=Asinx, with an amplitude A of 30mm.

[0030] To verify the cutting effect of the stubble and straw of this invention, the working angles F1 and F2 of the longitudinal stubble cutting assembly 3 were set to 0°. A field operation test was conducted on a corn stubble plot left after harvest in a typical black soil region of Northeast China. The test subject was the late-maturing variety Zhengdan 958. The soil type of the test plot was black calcareous soil, with a soil moisture content of 22.3%, an average soil firmness of 1.6 MPa in the 0-100 mm soil layer, and corn stubble left after machine harvesting. The average stubble height was 140 mm, the stubble diameter was 30-40 mm, the surface straw coverage was 1.8 kg / m², and the straw length was 500-800 mm. The tractor used in the test was a John Deere 6B-1204 wheeled tractor with a power of 120 horsepower. The bidirectional gridded high-speed stubble cutting device of this invention has a working width W of 1300 mm and a set working depth h of 50 mm. The tractor performs field stubble cutting at a working speed of 12 km / h, with a working distance of 100 m, and repeats the operation 3 times.

[0031] Observations and records during the experiment: At an operating speed of 12 km / h, the cutting effects of straw and stubble were measured by comparing three operating methods: horizontal cutting only, longitudinal cutting only, and bidirectional grid cutting.

[0032] After the operation, a five-point sampling method was used to sample and measure the work area. Each sampling area was 1.5m × 3.0m. The number of stubble and the cutting status within the sampling area were counted, and the stubble removal rate was calculated. At the same time, the length distribution of residual straw on the ground was counted, and the straw cutting rate was calculated with a length of less than 150mm as the standard for qualified cutting. The results showed that under the conditions of a working speed of 12km / h and a depth of 50mm, the stubble removal rate of transverse cutting alone was 87.5%, and the straw cutting rate was 80.2%; the stubble removal rate of longitudinal cutting alone was 65.3%, and the straw cutting rate was 67.4%; and the stubble removal rate of bidirectional grid cutting was 90.5%, and the straw cutting rate was 89.5%.

[0033] Experiments have shown that, at a working speed of 12 km / h and a depth of 50 mm, the bidirectional grid cutting method is significantly more effective at cutting stubble and straw than the methods of cutting only horizontally or only vertically.

[0034] Field trials were conducted to verify and compare the effects of different notch structures on the cutting efficiency of corn stalks and stubble. Control groups included semi-circular notch structures and no notch structures. The technical data after the three notch structures were as follows: The stalk cutting rate was 90.5% with the notch structure, 88.4% with the semi-circular notch structure, and 84.7% with the no-notch structure; the stubble removal rate was 89.5% with the notch structure, 89.2% with the semi-circular notch structure, and 88.6% with the no-notch structure. The data indicate that the notch structure significantly affects the corn stalk cutting rate.

[0035] Field trials were conducted to verify and compare the effects of wavy contour patterns on the cutting efficiency of corn stalks and stubble. Control groups included circular and straight contour patterns. Technical data after the three contour patterns were analyzed: the stalk cutting rate was 90.5% for the wavy contour, 90.1% for the circular contour, and 89.6% for the straight contour; the stubble removal rate was 89.5% for the wavy contour, 87.4% for the circular contour, and 82.7% for the straight contour. The data indicate that the wavy contour pattern significantly affects the stubble removal rate.

[0036] Example 2 The two-way gridded high-speed stubble cutting method includes the following steps: S1. After autumn mechanical harvesting, the stubble height should be ≤150mm, the straw length on the ground should be ≤800mm, and the harvested straw should be evenly covered on the ground. S2. A grid-like cutting operation is carried out on the stubble and long straw on the ground using bidirectional cutting lines. The working width W of the cutting lines is 1300mm. Cutting lines 1 and 2 are transverse cutting lines, and cutting line 3 is a longitudinal cutting line. Cutting line 1 mainly performs preliminary cutting on the head of the stubble and the longitudinally distributed long straw. The cutting line height H1 is 150mm, the deflection angle a1 is 10°, and the distance K1 between two adjacent cutting lines is 120mm. Cutting line 2 mainly performs fine cutting on the head of the stubble and the longitudinally distributed long straw. The cutting line height H2 is 75mm, the deflection angle a2 is 5°, and the distance K2 between two adjacent cutting lines is 60mm. Cutting line 3 mainly cuts the bottom of the stubble and the transversely distributed long straw. The cutting line has a corrugated structure, the wavelength H3 is 60mm, and the wave height a3 is 45mm. The cutting angle of the No. 3 cutting line is adjustable, with an adjustment angle of 6°. The working depth of the cutting line is 50mm, and the working speed of the cutting line is 12km / h.

[0037] The bidirectional gridded high-speed stubble cutting and straw chopping device includes: a main frame 1, a transverse stubble cutting assembly 2 and a longitudinal stubble cutting assembly 3. The device has a working speed of 12 km / h, a working depth h of 50 mm, and a working width W of 1300 mm.

[0038] The main frame 1 consists of a traction frame 101, a front suspension frame 102, a rear support frame 103, a depth adjustment mechanism 104, a hydraulic cylinder 105, and a ground wheel 106. The traction frame 101 is connected to the rear support frame 103 by using a lead screw and a pin. The front suspension frame 102 is fixed to the rear support frame 103 by using a U-shaped clamp. The depth adjustment mechanism 104 is adjusted by adjusting the length of the hydraulic cylinder 105 to change the height of the ground wheel 106 relative to the rear support frame 103, thereby controlling the working depth h of the transverse shaving assembly 2 and the longitudinal shaving assembly 3. The transverse shaving assembly 2 consists of a fixed base 201, an adjusting plate 202, a front cutter roller seat 203, a front cutting blade 204, a rear cutter roller seat 205, a rear cutting blade 206, and a transverse bearing seat 207. The fixed base 201 is connected to the front suspension frame 102 of the main frame 1 by bolts. The fixed base 201 and the adjusting plate 202 are connected by two bolts. The adjusting plate 202 has one center hole and multiple adjusting holes. The working depth of the transverse shaving assembly 2 is adjusted by rotating around the center hole. The relative position of the transverse shaving assembly 2 and the front suspension frame 102 is fixed by bolts. The working depth of the transverse shaving assembly 2 is set individually. The front cutter roller seat 203 and the rear cutter roller seat 205 are connected to the adjusting plate 202 by bolts through the transverse bearing seat 207. The front cutting blade 204 is connected to the front cutter roller seat 203 by bolts. The rear cutting blade 206 is connected to the rear cutter roller seat 205 by bolts. The front cutter roller seat 203 uses bolts to mount the front cutting blades 204. Six are evenly arranged along the circumference of the circular tube, and three groups are arranged along the axial direction of the circular tube. The front cutting blades 204 in the middle group are staggered relative to the front cutting blades 204 in the side groups. The spacing between the groups is 500mm. The front cutting blades 204 have mounting holes for mounting the blades. The diameter of the mounting holes is 13mm, and the longitudinal spacing between adjacent mounting holes is 25mm. This is used for fine adjustment of the working depth of the front cutting blades 204. The outer circumference diameter D1 of the front cutter roller seat 203 after mounting the front cutting blades 204 is 600mm. An installation angle G1 of 8° is provided between the front cutting blade 204 and the axis of the central shaft. The rear cutter roller seat 205 is equipped with rear cutting blades 206 by bolts. Six blades are evenly arranged along the circumference of the circular tube and three groups are arranged along the axial direction of the circular tube. The rear cutting blades 206 in the middle group are staggered relative to the rear cutting blades 206 in the side groups. The spacing between the groups is 500mm. The outer circumference diameter D2 of the rear cutter roller seat 205 after the rear cutting blades 206 are installed is 350mm. The back cutting blade 206 is provided with an installation angle between itself and the axis of the central shaft, and the installation angle G2 is 4°. The longitudinal shaving assembly 3 is divided into a left longitudinal shaving assembly and a right longitudinal shaving assembly. It is fixed to the rear bracket 103 of the main frame 1 using bolts and U-shaped clamps. The left and right longitudinal shaving assemblies have the same structural composition and adjustment method. Taking the left longitudinal shaving assembly as an example, it mainly consists of a front vertical shaft 301, a front axle seat 302, a front beam 303, a bend plate support 304, a bend handle 305, a scraper baffle 306, a connecting shaft 307, a limiting plate 308, a corrugated cutter head 309, a double-ended lead screw 310, and a fixed support 31. 1. The system comprises a fixed lead screw 312, a rear vertical shaft 313, a rear axle seat 314, a rear beam 315, a scraper beam 316, a scraper blade 317, and a longitudinal bearing seat 318. The front axle seat 302 is connected to the rear support 103 of the main frame 1 via the front vertical shaft 301 and a hexagonal slotted nut. The rear axle seat 314 is connected to the rear support 103 of the main frame 1 via the rear vertical shaft 313 and a hexagonal slotted nut. The fixed support 311 is fixed to the rear support 103 of the main frame 1 via a U-shaped clamp. The front axle seat 302 and the rear axle seat 314 are respectively welded to the front... Beam 303 and rear beam 315, and the curved plate support 304 are respectively connected to the front beam 303 and rear beam 315 by bolts. The curved handle 305 is fixed to the curved plate support 304 by bolts, and the curved handle 305 is fixed to the longitudinal bearing seat 318 by bolts. The connecting shaft 307 passes between the two longitudinal bearing seats 318. Limiting plates 308 and corrugated cutter heads 309 are installed at equal intervals on the connecting shaft 307, with a spacing of 200mm between adjacent corrugated cutter heads 309. The scraping beam 316 is fixed to the curved handle 305 by bolts. A U-shaped... The scraper baffle 306 and scraper blade 317 are installed at equal intervals with clamps. The scraper baffle 306 is installed at the position where the longitudinal bearing seat 318 is located, and the scraper blade 317 is installed at the other positions. The double-ended screw 310 is installed between the front beam 303 and the rear beam 315 by bolts. The angle of the longitudinal cutting assembly 3 is adjusted by the installation length of the double-ended screw 310. The fixed screw 312 is installed between the front beam 303 and the rear beam 315 by bolts. The angle of the longitudinal cutting assembly 3 is adjusted by the double-ended screw 310. The angle adjustment operation procedure of the longitudinal cutting assembly 3 is as follows: Taking the left longitudinal cutting assembly as an example, by controlling the length of the double-ended screw 310, one end of the double-ended screw 310 is fixed to the main frame 1 by the fixed support 311 through a U-shaped clamp. The other end of the double-ended screw 310 forces the front beam 303 to rotate relative to the front axle seat 302. The rotation point is Z1. The rotation of the front beam 303 causes one end of the fixed screw 312 to move at the same time. The other end of the fixed screw 312 drives the rear beam 315 to rotate relative to the rear axle seat 314. The rotation point is Z2. This makes the working angle F1 between the front beam 303 and the rear beam 315 form. The working angle F2 of the right longitudinal cutting assembly is adjusted in the same way as the left longitudinal cutting assembly. The working angle F2 is adjusted by controlling the installation length of the double-ended screw 310. The rotation point of the front beam position is Z3, and the rotation point of the rear beam position is Z4. Working angle F1, angle adjustment to 6°; working angle F2, angle adjustment to 6°; The corrugated cutter head 309 features both a stalk-cutting notch structure and a corrugated structure. The stalk-cutting notch structure consists of an arc segment from point B0 to B1 and a broken line segment from point B1 to B5. The arc segment from B0 to B1 serves as a guide arc to fix the surface straw, with the radius R related to the diameter of the surface straw cross-section and set at 50mm. The pointed tip at point B4 is used to penetrate the straw, aiding in its breaking. The angle b between line segments B3-B4 and B4-B5 is 50°. The cross-section of the broken line segment B3-B4-B5 is wedge-shaped to reduce cutting resistance during operation, with a wedge angle c of 45°. The notch length P1 is 180mm, and the notch tip length P2 is 120mm. The corrugated structure refers to the corrugated profile of the corrugated cutter head 309 being set as corrugated. The outer contour curve of the corrugated cross section is a sinusoidal function with the equation of the outer contour curve being y=Asinx and the amplitude A being 30mm.

[0039] To verify the effectiveness of this invention in cutting stubble and straw and disturbing the soil, the working angles F1 and F2 of the longitudinal stubble cutting assembly 3 were set to 6°. A field trial was conducted on a corn stubble plot in a typical black soil region of Northeast China, using the early-maturing variety Suiyu 7. The soil type of the experimental plot was black calcareous soil with a moisture content of 22.3%, an average soil firmness of 1.6 MPa in the 0–100 mm layer, and corn stubble left after machine harvesting. The average stubble height was 140 mm, the stubble diameter was 30–40 mm, the surface straw coverage was 1.8 kg / m², and the straw length was 500–800 mm. The tractor used in the experiment was a John Deere 6B-1204 wheeled tractor with a 120 hp engine. The bidirectional gridded high-speed stubble cutting device of this invention has a working width W of 1300 mm and a working depth h of 50 mm. The tractor performs field stubble cutting at a working speed of 12 km / h, with a working distance of 100 m, and repeats the operation 3 times.

[0040] During the experiment, observations and records were made: at a working speed of 12 km / h, the effects of cutting stubble and straw and disturbing the soil were measured by comparing three working methods: horizontal cutting only, vertical cutting only, and bidirectional grid cutting.

[0041] After the operation, a five-point sampling method was used to sample and measure the operation area. Each sampling point had an area of ​​1.5m × 3.0m. The number of stubble and the cutting status within the sampling area were counted to calculate the stubble removal rate. At the same time, the length distribution of residual straw on the ground was counted, with a length of less than 150mm as the standard for qualified cutting, and the straw cutting rate was calculated. The area of ​​soil disturbance and the theoretical area of ​​soil operation were measured, and the soil disturbance coefficient was calculated by dividing the area of ​​soil disturbance by the theoretical area of ​​soil operation. The results showed that under the conditions of an operation speed of 12km / h and a depth of 50mm, the stubble removal rate of transverse cutting alone was 88.6%, the straw cutting rate was 81.1%, and the soil disturbance coefficient was 79.6%; the stubble removal rate of longitudinal cutting alone was 72.4%, the straw cutting rate was 79.3%, and the soil disturbance coefficient was 74.5%; and the stubble removal rate of bidirectional grid cutting was 92.4%, the straw cutting rate was 91.8%, and the soil disturbance coefficient was 90.2%.

[0042] Experiments have shown that, at a working speed of 12 km / h and a depth of 50 mm, the bidirectional grid cutting method is significantly more effective than the methods of cutting stubble and straw and disturbing the soil than the methods of cutting only horizontally or only vertically.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-way gridded high-speed stubble-breaking and straw-cutting device, characterized in that, It includes a main frame, a transverse shaving assembly and a longitudinal shaving assembly respectively mounted on the main frame; The transverse cutting assembly includes a front cutter roller seat and a rear cutter roller seat. A front cutting blade is mounted on the front cutter roller seat, and a rear cutting blade is mounted on the rear cutter roller seat. The front cutting blade and the rear cutting blade are respectively installed at an angle to the axis of their respective cutter rollers. The longitudinal cutting assembly is divided into a left longitudinal cutting assembly and a right longitudinal cutting assembly. The left longitudinal cutting assembly and the right longitudinal cutting assembly have the same structure, including a front vertical shaft, a front axle seat, a front beam, a bent plate support, a bent handle, a scraper baffle, a connecting shaft, a limiting plate, a corrugated cutter head, a double-ended lead screw, a fixed support, a fixed lead screw, a rear vertical shaft, a rear axle seat, a rear beam, a scraper beam, a scraper blade, and a longitudinal bearing seat.

2. The bidirectional gridded high-speed stubble-breaking and straw-cutting device according to claim 1, characterized in that, The main frame includes a towing frame, a front suspension frame, a rear support, a depth adjustment mechanism, a hydraulic cylinder, and ground wheels; The transverse stubble cutting assembly is mounted on the front suspension frame, the longitudinal stubble cutting assembly is mounted on the rear support, the traction frame is connected to the rear support via a lead screw and a pin, the front suspension frame is fixed to the rear support via a U-shaped clamp, and the depth adjustment mechanism adjusts the height of the ground wheel relative to the rear support via a hydraulic cylinder.

3. The bidirectional gridded high-speed stubble-breaking and straw-cutting device according to claim 2, characterized in that, The transverse cutting assembly also includes a fixed base, an adjusting plate, and a transverse bearing housing; The fixed seat is connected to the front suspension frame, and the fixed seat is connected to the adjusting plate by bolts. The adjusting plate is provided with a center hole and multiple adjusting holes for adjusting the working depth of the transverse cutting assembly. The front cutter roller seat and the rear cutter roller seat are connected to the adjusting plate by the transverse bearing seat and bolts.

4. The bidirectional gridded high-speed stubble-breaking and straw-cutting device according to claim 2, characterized in that, The front axle seat is connected to the rear bracket via a front vertical shaft, and the rear axle seat is connected to the rear bracket via a rear vertical shaft. The front axle seat and the rear axle seat are respectively welded to the front beam and the rear beam. The bent plate support connects the front beam and the rear beam. The bent handle connects the bent plate support and the longitudinal bearing seat. The connecting shaft passes through the longitudinal bearing seats. The limiting plate and the corrugated cutter disc are installed on the connecting shaft. The distance between adjacent corrugated cutter discs is 180-220mm. The scraping beam is fixed to the bent handle. The scraping beam is equipped with the scraping folding plate and the scraping blade. The double-ended lead screw and the fixed lead screw are installed between the front beam and the rear beam. The working angle adjustment range is 0°-12°.

5. The bidirectional gridded high-speed stubble-breaking and straw-cutting device according to claim 4, characterized in that, In the stalk cutting notch structure of the corrugated cutter head, the guide arc radius R is 40-60mm, the notch angle b is 45°-60°, the wedge angle c is 30°-90°, the notch length P1 is 160-220mm, and the notch tip length P2 is 100-150mm. The outer profile curve of the corrugated circular contour of the corrugated cutter head is a sine function y=Asinx, where A is 20-50mm.

6. The bidirectional gridded high-speed stubble-breaking and straw-cutting device according to claim 1, characterized in that, The front cutter roller seat is uniformly provided with 6 front cutting blades along the circumference and 3 groups along the axial direction. The middle group and the side group are staggered and the spacing between the groups is 350-850mm. The outer circumference diameter D1 of the front cutter roller seat after the front cutting blades are installed is 400-700mm. The installation angle G1 between the front cutting blades and the axis is 6°-12°. The rear cutter roller seat is uniformly provided with 6 rear cutting blades along the circumference and 3 groups along the axial direction. The middle group and the side group are staggered and the spacing between the groups is 350-850mm. The outer circumference diameter D2 of the rear cutter roller seat after the rear cutting blades are installed is 300-400mm. The installation angle G2 between the rear cutting blades and the axis is 3°-6°.

7. A method for operating a bidirectional gridded high-speed stubble-breaking and straw-cutting device, characterized in that, Includes the following steps: After autumn mechanical harvesting, the stubble height should be ≤150mm and the surface straw length should be ≤800mm. The harvested straw should be evenly covered on the ground. A two-way gridded high-speed stubble cutting device should be used to perform gridded cutting of the stubble and surface straw with two-way cutting lines. The working width W of the cutting line is 1000-2000mm, of which there are two transverse cutting lines and one longitudinal cutting line.

8. The method according to claim 7, characterized in that, The horizontal cutting lines are cutting line 1 and cutting line 2, and the vertical cutting line is cutting line 3; The No. 1 cutting line is used to initially cut the root head and the longitudinally distributed long straw. The cutting line height H1 is 100-200mm, the deflection angle a1 is 6°-12°, and the distance K1 between two adjacent cutting lines is 100-200mm. The No. 2 cutting line is used to make a fine cut on the root head and the longitudinally distributed long straw. The cutting line height H2 is 50-100mm, the deflection angle a2 is 3°-6°, and the distance K2 between two adjacent cutting lines is 50-100mm. The No. 3 cutting line cuts the bottom of the stubble and the horizontally distributed long straw. The cutting line has a corrugated structure, with a wavelength H3 of 50-100mm and a wave height a3 of 30-60mm. The cutting angle of the No. 3 cutting line is adjustable, with an adjustment range of 0° to 6°.

9. The method according to claim 8, characterized in that, The distance K1 between two adjacent No. 1 cutting lines is twice the distance K2 between two adjacent No. 2 cutting lines.

10. The method according to claim 7 or 8, characterized in that, The cutting line has a working width W of 1300mm, a working depth of 20-150mm, and a working speed of ≥10km / h.

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