A disc dehorning mechanism

Abstract

The application discloses a disc stubble cleaning mechanism and belongs to the technical field of agricultural machinery.The bionic stubble cleaning cutter takes a white grub as a bionic prototype, analyzes the structure of the lower jaw cutting tooth of the white grub and applies the structure to the design of the stubble cleaning cutter.The bionic stubble cleaning cutter is driven to rotate by bevel gear transmission with a transmission ratio of about 2:1 and belt transmission with a transmission ratio of about 1:1, and the auxiliary stubble cleaning cutter with a barbed tooth shape is driven to rotate, and the barbed tooth profile tip can better generate a backward pulling force on the stubble while differentially rotating.The bionic stubble cleaning disc cutter has simple structure and good cutting performance, can effectively reduce the cutting resistance, and is not prone to wear and tear in a long-term use process, thereby prolonging the service life.The differential mechanism can effectively reduce the forward sliding rate of the corn stubble when the bionic stubble cleaning cutter cuts the corn stubble, and makes the bionic stubble cleaning cutter better clean the stubble.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of agricultural machinery, and particularly relates to a disc stubble breaking mechanism. BACKGROUND

[0002] One of the key technologies of protective tillage is the no-tillage seeding technology, that is, the use of no-tillage + straw mulching, which can protect the soil and increase the soil organic matter, but it is easy to cause the blockage of the machine during seeding, so a straw cleaning device is added in front of the no-tillage seeding machine on the market, and the most widely used stubble cutting device is, for example, a corrugated disc, a flat disc, a notched disc and the like. The corrugated disc has strong stubble breaking capacity and is particularly suitable for the land with more stubble. The wavy blade design can effectively reduce the grass entanglement phenomenon and has a good loosening effect on the soil, but the disturbance to the soil is relatively large; the flat disc has simple structure and low manufacturing cost; the flat disc cutter mainly relies on the self-gravity of the seeding machine and the sharp edge to cut off the stubble, has small disturbance to the soil, but has large sliding amount and poor stubble cutting effect; the notched disc is also suitable for the land with more stubble and has good stubble cutting effect, but the notched part is easy to wear and has short service life, and the notched disc cutter has small sliding amount compared with the flat disc cutter, but has the phenomenon of missing cutting; therefore, a cutter with strong cutting capacity and small disturbance to the soil is needed to solve the technical problems existing in the prior art. SUMMARY

[0003] In view of the above-mentioned technical problems, the present application provides a disc stubble breaking mechanism which is composed of a V-shaped frame A, a bionic stubble breaking blade assembly B, a profiling assembly C, an auxiliary stubble breaking blade assembly D, a large bevel gear assembly E, a small bevel gear assembly F, a belt pulley I 1, a belt 2 and a belt pulley II 3, wherein the V-shaped frame A is composed of a left plate 4, a top plate 5, a right plate 6 and a bottom plate 7, the front end of the left plate 4 and the right plate 6 is fixedly connected at an angle of 60 degrees, and the top plate 5 and the bottom plate 7 are fixedly connected to the upper and lower ends of the left plate 4 and the right plate 6 respectively; the left plate 4 is fixedly connected with a bearing I 4a, and the right plate 6 is fixedly connected with a bearing II 6a and a bearing III 6b.

[0004] The bionic stubble breaking blade assembly B is composed of a bionic stubble breaking blade 8 and a shaft coupling flange I 9, and the left end of the shaft coupling flange I 9 is screw-connected to the back center of the bionic stubble breaking blade 8.

[0005] The profiling assembly C is composed of a hole-bearing vertical plate 10, an upper plate 11, a telescopic cylinder 12, a spring 13 and a lower plate 14, and the hole-bearing vertical plate 10, the upper plate 11, the telescopic cylinder 12 and the lower plate 14 are sequentially arranged from top to bottom, and the spring 13 is sleeved in the telescopic cylinder 12; the upper plate 11 and the lower plate 14 are fixedly connected to the upper end and the lower end of the telescopic cylinder 12.

[0006] The auxiliary stubble cleaning blade assembly D is composed of the auxiliary stubble cleaning blade 15 and the shaft flange II 16, and the shaft flange II 16 is screw-connected to the back center of the auxiliary stubble cleaning blade 15.

[0007] The bevel gear assembly E is composed of the bevel gear 17 and the connecting shaft I 18, and the connecting shaft I 18 is fixedly connected to the back center of the bevel gear 17.

[0008] The bevel gear assembly F is composed of the bevel gear 19 and the connecting shaft II 20, and the connecting shaft II 20 is fixedly connected to the back center of the bevel gear 19.

[0009] The lower plate 14 of the profiling assembly C is fixedly connected to the top plate 5 of the V-shaped frame A. The connecting shaft II 20 of the bevel gear assembly F is interference-connected to the inner ring of the bearing I 4a of the V-shaped frame A near the back of the bevel gear 19. The connecting shaft I 18 of the bevel gear assembly E is interference-connected to the inner ring of the bearing II 6a of the V-shaped frame A near the back of the bevel gear 17, and the middle part of the connecting shaft I 18 is fixedly connected to the belt pulley II 3. The right end of the shaft flange I 9 of the bionic stubble cleaning blade assembly B is fixedly connected to the left end of the connecting shaft II 20 of the bevel gear assembly F.

[0010] The left end of the shaft flange II 16 of the auxiliary stubble cleaning blade assembly D is interference-connected to the inner ring of the bearing III 6b of the V-shaped frame A, and the middle part of the shaft flange II 16 is fixedly connected to the belt pulley I 1. The belt pulley I 1 and the belt pulley II 3 are connected through the belt 2. The bevel gear 17 of the bevel gear assembly E is engaged with the bevel gear 19 of the bevel gear assembly F.

[0011] The bionic stubble cleaning blade 8 has a magnification ratio of 1 / 50, and the diameter of the blade is 425-430 mm. The outer contour curve of the blade tooth part is connected at the notch circular arc after smooth transition of the blade tip curve ab, the strong cutting edge curve bc and the cutting edge curve cd, with the blade center as the coordinate origin.

[0012] The mathematical expression of the blade tip curve ab is:

[0013] y = 280 - 67.64cos(0.25x) + 83.67sin(0.25x) + 1.658cos(2*0.2x) + 30.38sin(2*0.25x);

[0014] Wherein, the value range of x is -48≤x≤-36; if calculated in mm, the value range of x is -0.96≤x≤-0.72 mm.

[0015] The mathematical expression of the strong cutting edge curve bc is:

[0016] y = 9.72x 6 -2.39x 5 +2.53x 4 + 0.908x 3 + 0.049x 2 +0.49x + 67.5;

[0017] wherein: the value range of x is -36<=x<=-8, if calculated in mm, the value range of x is -0.72<=x<=-0.16 mm;

[0018] The mathematical expression of the cutting edge curve cd is:

[0019] y = 1.091x 6 -7.308x 5 +1.764x 4 -0.18x 3 +0.071x 2 +0.67x + 128.88;

[0020] wherein: the value range of x is -8<=x<=24, if calculated in mm, the value range of x is -0.16<=x<=0.48 mm.

[0021] The pitch circle diameter of the small bevel gear 19 is 60<=d1<=62 mm, and the pitch angle is 30 degrees; the pitch circle diameter of the large bevel gear 17 is 120<=d2<=122 mm, and the pitch angle is 30 degrees; the modulus is equal, the pressure angle is equal, the meshing mode of the two bevel gears is diagonal transmission, the shaft intersection angle is 120 degrees, and the transmission ratio is 2:1.

[0022] The beneficial effects of the application are that the disc stubble breaking mechanism takes the earthworm as the bionic object, analyzes the mandibular cutting tooth structure and applies it to the stubble breaking knife design, so that the cutting ability is enhanced; and the structure is simple, the cutting performance is good, the cutting resistance can be effectively reduced, the stubble breaking knife is not easy to wear in the long-term use process, and the service life is prolonged. While the bionic stubble breaking knife cuts the roots in the soil, the differential mechanism drives it to rotate, the tip rotates forward at the same time, and because of the differential, the auxiliary stubble breaking knife rotates at a lower speed compared with the fast rotation of the bionic stubble breaking knife, the speed difference between the two makes the auxiliary stubble breaking knife generate a better backward pulling force on the roots while working, which can effectively reduce the forward sliding rate of the corn roots when the bionic stubble breaking knife cuts the corn roots, and make the bionic stubble breaking knife better break the stubble. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the disc de-stoking mechanism;

[0024] Figure 2 is a front view of the disc de-stoking mechanism;

[0025] Figure 3 is a top view of the disc de-stoking mechanism;

[0026] Figure 4 is a structural schematic diagram of the V-shaped frame A;

[0027] Figure 5 is a structural schematic diagram of the bionic de-stoking blade assembly B;

[0028] Figure 6 is an axonometric view of the bionic de-stoking blade assembly B;

[0029] Figure 7 is a structural schematic diagram of the profiling assembly C;

[0030] Figure 8 is a structural schematic diagram of the auxiliary de-stoking blade assembly D;

[0031] Figure 9 is an axonometric view of the auxiliary de-stoking blade assembly D

[0032] Figure 10 is a structural schematic diagram of the large bevel gear assembly E;

[0033] Figure 11 is a structural schematic diagram of the small bevel gear assembly F;

[0034] Figure 12 is a structural schematic diagram of the bionic de-stoking blade 8;

[0035] Wherein: A. V-shaped frame B. Bionic de-stoking blade assembly C. Profiling assembly D. Auxiliary de-stoking blade assembly E. Large bevel gear assembly F. Small bevel gear assembly 1. Pulley I 2. Belt 3. Pulley II 4. Left plate 5. Top plate 6. Right plate 7. Bottom plate 8. Bionic de-stoking blade 9. Coupling flange I 10. Hole stand 11. Upper plate 12. Telescopic cylinder 13. Spring 14. Lower plate 15. Auxiliary de-stoking blade 16. Coupling flange II 17. Large bevel gear 18. Connecting shaft I 19. Small bevel gear 20. Connecting shaft II. DETAILED DESCRIPTION

[0036] The present application is described below in conjunction with the accompanying drawings.

[0037] As shown in Figures 1 to 3, a disc-shaped stubble-breaking mechanism of the present invention comprises a V-frame A, a biomimetic stubble-breaking blade assembly B, a contouring assembly C, an auxiliary stubble-breaking blade assembly D, a large bevel gear assembly E, a small bevel gear assembly F, a pulley I1, a belt 2, and a pulley II3. The lower plate 14 of the contouring assembly C is fixedly connected to the top plate 5 of the V-frame A. The connecting shaft II20 of the small bevel gear assembly F is interference-fitted with the inner ring of the bearing I4a of the V-frame A near the back of the small bevel gear 19. The connecting shaft I18 of the large bevel gear assembly E is interference-fitted with the inner ring of the bearing II6a of the V-frame A near the back of the large bevel gear 17, and the pulley II3 is fixedly connected to the middle of the connecting shaft I18. The right end of the coupling flange I9 of the biomimetic stubble-breaking blade assembly B is fixedly connected to the left end of the connecting shaft II20 of the small bevel gear assembly F. The coupling flange II16 of the auxiliary stubble-breaking blade assembly D... The left end is interference-fitted with the inner ring of bearing Ⅲ6b of V-frame A, and pulley Ⅰ1 is fixedly connected to the middle of coupling flange Ⅱ16; pulley Ⅰ1 and pulley Ⅱ3 are connected by belt 2; the large bevel gear 17 of the large bevel gear assembly E meshes with the small bevel gear 19 of the small bevel gear assembly F.

[0038] As shown in Figure 4, the V-shaped frame A consists of a left plate 4, a top plate 5, a right plate 6, and a bottom plate 7. The front ends of the left plate 4 and the right plate 6 are fixed at a 60-degree angle. The top plate 5 and the bottom plate 7 are fixed to the upper and lower ends of the left plate 4 and the right plate 6, respectively. Bearing I 4a is fixed to the left plate 4, and bearing II 6a and bearing III 6b are fixed to the right plate 6.

[0039] As shown in Figures 5 and 6, the bionic stubble-breaking blade assembly B consists of a bionic stubble-breaking blade 8 and a coupling flange I9. The left end of the coupling flange I9 is ​​screwed to the center of the back of the bionic stubble-breaking blade 8.

[0040] As shown in Figure 7, the contouring component C consists of a perforated upright plate 10, an upper plate 11, a telescopic cylinder 12, a spring 13, and a lower plate 14. The perforated upright plate 10, the upper plate 11, the telescopic cylinder 12, and the lower plate 14 are arranged in order from top to bottom. The spring 13 is fitted onto the telescopic cylinder 12. The upper plate 11 and the lower plate 14 are fixed to the upper and lower ends of the telescopic cylinder 12, respectively.

[0041] As shown in Figures 8 and 9, the auxiliary stubble-breaking blade assembly D consists of an auxiliary stubble-breaking blade 15 and a coupling flange II 16. The right end of the coupling flange II 16 is screwed to the center of the back of the auxiliary stubble-breaking blade 15.

[0042] As shown in Figure 10, the large bevel gear assembly E is composed of a large bevel gear 17 and a connecting shaft I 18, the left end of the connecting shaft I 18 is fixedly connected to the back center of the large bevel gear 17.

[0043] As shown in Figure 11, the small bevel gear assembly F is composed of a small bevel gear 19 and a connecting shaft II 20, the right end of the connecting shaft II 20 is fixedly connected to the back center of the small bevel gear 19.

[0044] As shown in Figure 12, the four points "a", "b", "c" and "d" in the bionic stubble cutter blade are the start and end points of the blade tip curve ab, the strong cutting edge curve bc and the cutting edge curve cd.

[0045] The present application selects the larva mandible as the biological model, scans the overall profile of the larva mandible by laser confocal microscope, after scanning is completed, a plurality of two-dimensional plane profiles in the middle height range are obtained. The obtained two-dimensional profile is compared on the computer, the optimal profile reflecting the structural characteristics of the larva mandible is selected and marked, and is exported as a TIF image. Matlab software is used to write a command to extract the larva profile characteristic curve. After extraction, the edge profile curve is segmented and divided, the non-working interval of the larva mandible is discarded, the working interval is divided into three curve segments, and the point coordinates are exported as excel. The three extracted characteristic curves are fitted by using the cftool toolbox. When the degree is greater than 0.95, the smallest degree is selected to obtain a relatively ideal characteristic fitting curve. Three profile fitting curve equations are obtained.

[0046] According to the extracted curve equation, after simplification, the equation driven curve command is selected in Solidworks 2022 using the new sketch command, the coordinate system and the coordinates of the curve end points are determined, the curve sketch is generated, and the bionic stubble cutter blade 8 with a magnification coefficient of 1 / 50 is obtained.

[0047] The expression of the blade tip curve ab part is:

[0048] y=280-67.64cos(0.25x)+83.67xsin(0.25x)+1.658xcos(2x0.2x)+30.38xsin(2x0.25x)

[0049] Wherein: the value range of x is-48≤x≤-36; if calculated in mm, the value range of x is-0.96≤x≤-0.72mm

[0050] The expression of the strong cutting edge curve bc part is:

[0051] y = 9.72x6 - 2.39x5 + 2.53x4 + 0.908x3 + 0.049x2 + 0.49x + 67.5

[0052] wherein: x value range is -36≤x≤-8, if calculated in mm, then x value range is -0.72≤x≤-0.16 mm

[0053] The expression of the cutting edge curve cd part is:

[0054] y = 1.091x6 - 7.308x5 + 1.764x4 - 0.18x3 + 0.071x2 + 0.67x + 128.88

[0055] wherein: x value range is -8≤x≤24, if calculated in mm, then x value range is -0.16≤x≤0.48 mm

[0056] The auxiliary stubble cleaning blade 15 in the application selects a barb tooth profile, and the diameter is 360 mm, the difference between the diameter and the diameter of the bionic stubble cleaning disc is the height of the part of the corn stubble root hair exposed to the soil and the part entering the soil, and the auxiliary stubble cleaning disc basically does not enter the soil during movement, and the auxiliary stubble cleaning disc is driven to rotate through a differential mechanism while the bionic stubble cleaning disc cuts the stubble and enters the soil, the tip of the auxiliary stubble cleaning disc rotates forward at the same time, because of the differential, the auxiliary stubble cleaning disc rotates at a lower speed compared with the fast rotation of the bionic stubble cleaning disc, the speed difference between the two enables the auxiliary stubble cleaning disc to generate a backward pulling force on the stubble better while working, so that the bionic stubble cleaning disc can better clean the stubble.

[0057] The pitch circle diameter of the small bevel gear in the application is 60≤d1≤62 mm, the pitch angle is 30 degrees; the pitch circle diameter of the large bevel gear is 120≤d2≤122 mm, the pitch angle is 30 degrees; the modulus is equal, the pressure angle is equal, the meshing mode of the two bevel gears is diagonal transmission, the shaft intersection angle is 120 degrees, and the transmission ratio is 2:1.

Claims

1. A disc-shaped slag-breaking mechanism, characterized in that: It consists of a V-shaped frame (A), a biomimetic stubble-breaking blade assembly (B), a contour-following assembly (C), an auxiliary stubble-breaking blade assembly (D), a large bevel gear assembly (E), a small bevel gear assembly (F), pulley I (1), a belt (2), and pulley II (3). The V-shaped frame (A) is composed of a left plate (4), a top plate (5), a right plate (6), and a bottom plate (7). The front ends of the left plate (4) and the right plate (6) are fixed at a 60° angle. The top plate (5) and bottom plate (7) are respectively fixed to the upper and lower ends of the left plate (4) and right plate (6); bearing I (4a) is fixed to the left plate (4), and bearing II (6a) and bearing III (6b) are fixed to the right plate (6); the bionic stubble-breaking blade assembly (B) consists of a bionic stubble-breaking blade (8) and a coupling flange I (9), with the left end of the coupling flange I (9) screwed to the center of the back of the bionic stubble-breaking blade (8); the contour-following assembly (C) consists of a perforated upright plate (10), an upper plate (11), a telescopic cylinder (12), a spring (13), and a lower plate (14), arranged in order from top to bottom, with the spring (13) sleeved on the extension plate. The telescopic cylinder (12) is fixed to the upper and lower ends of the telescopic cylinder (12); the auxiliary stubble-breaking blade assembly (D) consists of an auxiliary stubble-breaking blade (15) and a coupling flange II (16), with the right end of the coupling flange II (16) screwed to the center of the back of the auxiliary stubble-breaking blade (15); the large bevel gear assembly (E) consists of a large bevel gear (17) and a connecting shaft I (18), with the left end of the connecting shaft I (18) fixed to the center of the back of the large bevel gear (17); the small bevel gear assembly (F) consists of a small bevel gear (19) and a connecting shaft II (20), with the right end of the connecting shaft II (20) fixed to the center of the back of the small bevel gear (19); the lower plate (14) of the contour assembly (C) is fixed to V. On the top plate (5) of the frame (A); the connecting shaft II (20) of the small bevel gear assembly (F) is interference-fitted with the inner ring of the bearing I (4a) of the V-frame (A) near the back of the small bevel gear (19); the connecting shaft I (18) of the large bevel gear assembly (E) is interference-fitted with the inner ring of the bearing II (6a) of the V-frame (A) near the back of the large bevel gear (17), connecting shaft I (18) The middle fixed pulley II (3); the right end of the coupling flange I (9) of the bionic slag cutter blade assembly (B) is fixed to the left end of the connecting shaft II (20) of the small bevel gear assembly (F); the left end of the coupling flange II (16) of the auxiliary slag cutter blade assembly (D) is interference-fitted to the inner ring of the bearing III (6b) of the V-frame (A), and the middle of the coupling flange II (16) is fixed to the pulley I (1); the pulley I (1) and the pulley II (3) are connected by the belt (2); the large bevel gear (17) of the large bevel gear assembly (E) meshes with the small bevel gear (19) of the small bevel gear assembly (F); The biomimetic stubble-breaking blade (8) has a magnification factor of 1 / 50 and a blade diameter of 425-430mm. The outer contour curve of the blade teeth is smoothly connected at the notch arc after a smooth transition from the tip curve, the strong cutting edge curve, and the cutting edge curve. The center of the blade is taken as the origin of the coordinate system. The mathematical expression of the tip curve is: y=280-67.64cos(0.25x) +83.67×sin(0.25x) + 1.658×cos(2×0.2x) +30.38×sin(2×0.25x); Where: the range of x is -48≤x≤-36; The mathematical expression for the strong cutting edge curve is: y=9.72x 6 -2.39x 5 +2.53x 4 + 0.908x 3 + 0.049x 2 +0.49x + 67.5; Where: the range of x is -36≤x≤-8; The mathematical expression for the cutting edge curve is: y=1.091x 6 -7.308x 5 +1.764x 4 -0.18x 3 +0.071x 2 +0.67x + 128.88; Where: the range of x is -8≤x≤24.

2. The disc-shaped slag-breaking mechanism according to claim 1, characterized in that: The pitch circle diameter of the small bevel gear (19) is 60≤d1≤ 62mm, cone angle is 30 degrees; the pitch circle diameter of the large bevel gear (17) is 120≤d2≤122mm, cone angle is 30 degrees; the modules are equal, the pressure angles are equal, the meshing method of the two bevel gears is oblique transmission, the shaft intersection angle is 120 degrees, and the transmission ratio is 2:1.

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