A coaxial bidirectional rotating rotary tiller

Abstract

The present invention discloses a coaxial, bidirectional rotary tiller, comprising a frame mounted on a tractor, a transmission system mounted on the frame, and a rotary blade roller, the frame comprising a crossbeam and two side plates fixed at both ends of the crossbeam, the transmission system comprising a gearbox located in the middle of the frame, an intermediate transmission box located below the gearbox, and side transmission boxes located at both ends of the frame; the rotary blade roller comprises a cutter shaft mounted on two side plates via two bearing blocks, a cutter disc mounted on the cutter shaft and rotated by corresponding hollow shafts, and a rotary blade mounted on the cutter disc. The present invention achieves coaxial, bidirectional rotation between two adjacent cutter discs on the cutter shaft, thereby providing more uniform force on the rotary blades, improving the soil cutting and stubble crushing effects of the rotary blades, and promoting more uniform stubble-soil mixing; the stubble rotary tiller adopts a double-headed spiral arrangement, which meets the requirement for uniform force on the rotary blades and improves the soil and stubble crushing performance of the rotary blades.

Description

Technical Field

[0001] The present invention belongs to the technical field of agricultural machinery, and more particularly relates to a coaxial bidirectional rotating rotary tiller. Background Art

[0002] A rotary tiller is a land preparation machine used in conjunction with a tractor to plow and harrow the soil. Its excellent soil-crushing capabilities not only keep the soil relatively flat during the shredding process, but also break up crop straw and mix it evenly with the soil. The transmission method of the working parts significantly influences the performance of the rotary tiller. A good transmission method can achieve a smoother plowing and harrowing of the soil, finer cutting of crop straw, and a more even mixing of the straw and soil.

[0003] Traditional transmission methods include belt drives, chain drives, and gear drives. Belt drives offer a simple structure, smooth motion, and cushioning effects. However, they suffer from slippage and unstable transmission ratios. Chain drives offer reliable transmission without slippage, strong overload capacity, and the ability to operate in challenging environments. They are also economical. However, they suffer from unstable instantaneous transmission ratios and poor transmission stability, making them unsuitable for high-speed operation and requiring a tensioning device in special circumstances. Gear drives are the most commonly used transmission method, offering a compact structure, stable transmission ratios, and the ability to transmit high power.

[0004] During the operation of the rotary tiller, the rotary tillage blades have uneven intervals of entering the soil, resulting in uneven force on the rotary tillage blades, poor soil cutting performance, some cutters easily loosening prematurely, uneven wear, and other problems. In addition, the rotary tillage crushing quality and straw-soil mixing uniformity are very poor. Summary of the Invention

[0005] In view of the defects of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a coaxial bidirectional rotating rotary tiller, in which the rotary tiller blades are evenly force-bearing, and the two adjacent blade discs can rotate in both directions, thereby having good soil cutting performance, improving the rotary tillage crushing quality and the uniformity of straw-soil mixing.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical measures:

[0007] The coaxial bidirectional rotating rotary tiller of the present invention comprises a frame mounted on a tractor, a transmission system and a rotary tiller roller mounted on the frame, the frame comprising a crossbeam and two side plates fixed at both ends of the crossbeam, the transmission system comprising a gearbox located in the middle of the frame, an intermediate transmission box located below the gearbox, and side transmission boxes located at both ends of the frame; the rotary tiller roller comprises a cutter shaft arranged on two side plates through two bearing seats, a cutter disc mounted on the cutter shaft and rotated by a corresponding hollow shaft, and a rotary tiller mounted on the cutter disc; the tractor transmits power to the gearbox through a universal joint, and the gearbox then transmits power to the intermediate transmission box and the side transmission box, and the intermediate transmission box and the side transmission box drive the corresponding hollow shaft and the cutter disc to rotate. The rotary tiller rotates with the cutter disc; the gearbox includes a right gearbox and a left gearbox, the intermediate transmission box includes a left intermediate transmission box and a right intermediate transmission box, and the side transmission box includes a left transmission box and a right transmission box; the left transmission box includes a side transmission first vertical bevel gear and a side transmission second vertical bevel gear that rotate around the cutter shaft and turn in the opposite direction, the side transmission first vertical bevel gear is fixedly connected to the penultimate cutter disc on the left on the cutter shaft through a first hollow shaft, and the side transmission second vertical bevel gear is connected to the penultimate cutter disc on the left on the cutter shaft through a second hollow shaft; the second hollow shaft is arranged outside the cutter shaft through a bearing sleeve, the first hollow shaft is arranged outside the second hollow shaft through a bearing sleeve, and the penultimate cutter disc on the left on the cutter shaft is fixedly connected to the penultimate cutter disc on the left on the cutter shaft. The cutter disc and the penultimate cutter disc rotate in opposite directions; the structure of the right transmission box and the structure of the left transmission box are symmetrically arranged, and drive the penultimate cutter disc on the right and the penultimate cutter disc on the cutter shaft to rotate coaxially in both directions; the right intermediate transmission box includes an intermediate transmission first vertical bevel gear, an intermediate transmission second vertical bevel gear, an intermediate transmission third vertical bevel gear, and an intermediate transmission fourth vertical bevel gear that rotate around the cutter shaft, and the directions of the two adjacent vertical bevel gears are opposite, the intermediate transmission first vertical bevel gear and the sixth cutter disc from right to left on the cutter shaft are fixedly connected by the third hollow shaft, the intermediate transmission second vertical bevel gear and the fifth cutter disc from right to left on the cutter shaft are fixedly connected by the fourth hollow shaft, the intermediate transmission third vertical bevel gear and the cutter shaft The fourth cutter disc from right to left is fixedly connected through the fifth hollow shaft, the fourth vertical bevel gear of the intermediate transmission and the third cutter disc from right to left on the cutter shaft are fixedly connected through the sixth hollow shaft, the sixth hollow shaft is arranged outside the cutter shaft through a bearing sleeve, the fifth hollow shaft is arranged outside the sixth hollow shaft through a bearing sleeve, the fourth hollow shaft is arranged outside the fifth hollow shaft through a bearing sleeve, and the third hollow shaft is arranged outside the fourth hollow shaft through a bearing sleeve. The third cutter disc from right to left and the sixth cutter disc on the cutter shaft rotate in opposite directions; the structures of the left intermediate transmission box and the right intermediate transmission box are symmetrically arranged, and drive the third cutter disc from left to right and the sixth cutter disc on the cutter shaft to rotate coaxially and bidirectionally.

[0008] Furthermore, the left transmission box also includes a side transmission third vertical bevel gear located above the side transmission first vertical bevel gear and the side transmission second vertical bevel gear, and a side transmission first horizontal bevel gear meshing with the side transmission third vertical bevel gear; a side transmission second horizontal bevel gear meshing with both of the side transmission first vertical bevel gear and the side transmission second vertical bevel gear is provided between the side transmission first vertical bevel gear and the side transmission second vertical bevel gear, and the side transmission first horizontal bevel gear and the side transmission second horizontal bevel gear are synchronously connected through the first vertical transmission shaft.

[0009] Preferably, the right intermediate transmission box also includes an intermediate transmission first horizontal bevel gear located above the intermediate transmission first vertical bevel gear, the intermediate transmission second vertical bevel gear, the intermediate transmission third vertical bevel gear, and the intermediate transmission fourth vertical bevel gear; an intermediate transmission second horizontal bevel gear is provided above the intermediate transmission first horizontal bevel gear, and an intermediate transmission fifth vertical bevel gear is provided between the intermediate transmission first horizontal bevel gear and the intermediate transmission second horizontal bevel gear and is meshed with both of them; an intermediate transmission third horizontal bevel gear is provided between the intermediate transmission first vertical bevel gear and the intermediate transmission fourth vertical bevel gear and is meshed with both of them; an intermediate transmission fourth horizontal bevel gear is provided between the intermediate transmission second vertical bevel gear and the intermediate transmission third vertical bevel gear and is meshed with both of them; the intermediate transmission second horizontal bevel gear and the intermediate transmission fourth horizontal bevel gear are synchronously connected through a second vertical transmission shaft, and the intermediate transmission first horizontal bevel gear and the intermediate transmission third horizontal bevel gear are synchronously connected through a vertical hollow shaft, and the vertical hollow shaft is arranged outside the second vertical transmission shaft through a bearing sleeve.

[0010] Furthermore, the output shaft of the tractor is connected to the input shaft of the left gearbox through a universal joint, and the left gearbox drives the third vertical bevel gear of the side transmission to rotate; the left gearbox transmits power to the right gearbox, and the right gearbox drives the second horizontal bevel gear of the intermediate transmission to rotate.

[0011] Furthermore, the arrangement of the rotary tillage blades of the rotary tillage blade roller adopts a double-headed reverse spiral arrangement.

[0012] Preferably, the left gearbox and the right gearbox are mounted on the frame, the left transmission box and the right transmission box are mounted on the frame through side plates on both sides, and the left intermediate transmission box and the right intermediate transmission box are mounted on the knife shaft through bearings.

[0013] Preferably, a three-point suspension device is fixed on the crossbeam, and a soil pressing plate is installed on the side plate.

[0014] Compared with the prior art, the present invention has the following advantages and effects:

[0015] 1. The gearbox transmits power directly to the intermediate transmission box through gear transmission. The power is converted by the intermediate transmission box to drive the eight middle cutter discs on the cutter shaft to rotate, and the blades also rotate to complete the operation; the gearbox transmits power to the side transmission box through the universal joint, and then drives the two left and right cutter discs on the cutter shaft to rotate, and the blades on the cutter discs rotate accordingly to complete the operation.

[0016] 2. The present invention adopts a gear transmission, and the gear transmission box is installed in the middle and on both sides to prevent the problem of the machine tipping over due to unbalanced force. The two adjacent cutter discs on the cutter shaft rotate in different directions, that is, coaxial and bidirectional. This design can make the straw powder in the soil more broken and the soil and straw mixed more evenly.

[0017] 3. The overall structure of the present invention adopts two gearboxes and transmission boxes installed in the middle, and a transmission box is installed on each side. This can not only achieve the transmission effect of the rotary tiller, but also the highly symmetrical structure can make the force of the whole machine balanced, and there will be no overturning due to unbalanced force. Secondly, the rotary tiller blades are arranged according to a double-headed spiral line, which can not only meet the requirements of low tillage power consumption and uniform force on the knife roller, but also better achieve the effect of soil crushing and straw-soil mixing. Finally, the most prominent feature of the present invention is that the two adjacent knife discs on the knife shaft rotate in both directions, which can achieve a better effect of soil crushing and stubble crushing, making the straw-soil mixing more uniform.

[0018] 4. The rotary tillage blade roller adopts a double-headed reverse spiral arrangement, which can make the rotary tillage blade more evenly stressed and improve the soil and stubble breaking performance of the rotary tillage blade. While breaking the soil, the soil gathered in the middle after rotary tillage flows to both sides along the double-headed reverse spiral line, realizing two-way horizontal flow of soil; the symmetrical double-headed reverse spiral arrangement can also improve the stability of rotary tillage depth, avoid the large amount of straw distributed in the shallow soil layer, improve the uniformity of straw in the vertical direction of the soil, and realize deep burial of straw. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural schematic diagram of the coaxial bidirectional rotating rotary tiller of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the coaxial bidirectional rotating rotary tiller of the present invention from another angle;

[0022] Figure 3It is a structural diagram of the intermediate transmission component;

[0023] Figure 4 It is a structural diagram of the side transmission components;

[0024] Figure 5 This is a simplified structural diagram of the rotary tillage roller;

[0025] Figure 6 The figure is a transmission diagram of the coaxial bidirectional rotating rotary tiller of the present invention.

[0026] Among them, 1-cutter shaft, 2-left transmission box, 3-cutter disc, 4-rotary tiller, 5-left middle transmission box, 6-right middle transmission box, 7-crossbeam, 8-right transmission box, 9-universal joint, 10-three-point suspension device, 11-right gearbox, 12-left gearbox, 13-soil retaining cover, 14-side plate, 15-soil pressure plate. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] like Figures 1 to 6 As shown, the coaxial bidirectional rotary tiller of the present invention includes a frame mounted on a tractor, a transmission system mounted on the frame, and a rotary blade roller. The frame includes a crossbeam 7 and two side panels 14 fixed at each end of the crossbeam 7. A three-point suspension device 10 is fixed to the crossbeam 7, and further includes a soil pressing plate 15 mounted on the side panels 14 and a soil retaining cover 13 mounted on the crossbeam 7.

[0029] The transmission system primarily consists of a gearbox, an intermediate transmission case, side transmission cases, and universal joints 9. The gearbox is located in the middle of the frame, the intermediate transmission case is below it, and the side transmission cases are located at both ends of the frame. The transmission system transmits power to each part of the rotary tiller, and the rotary tiller rollers complete the tilling and crushing of the soil. The entire machine operates as follows: the tractor transmits power through universal joints 9 to the gearbox, which then transmits it to the intermediate and side transmission cases. These two cases drive the corresponding cutterheads, and the blades rotate with the cutterheads, completing the tilling and crushing of the soil.

[0030] The gearbox includes a right gearbox 11 and a left gearbox 12, both mounted on the frame. The intermediate transmission case includes a left intermediate transmission case 5 and a right intermediate transmission case 6, both mounted on the cutter shaft 1 via bearings. The side transmission cases include a left transmission case 2 and a right transmission case 8, both mounted on the frame via side panels 14. The output shaft of the tractor is connected to the input shaft of the left gearbox 12 through a universal joint, and the power is transmitted to the left gearbox 12. After speed change, and by utilizing the structural characteristics of the bevel gear, the left gearbox 12 transmits the power to the left transmission box 2 and the right transmission box 8 through the universal joint 9. The power rotating around the horizontal axis is converted into rotation around the vertical axis through the structural characteristics of the bevel gear. After another conversion in the side transmission box 2, the power rotating around the vertical axis is reversed to rotation around the horizontal axis; on the other hand, the power is transmitted to the right gearbox 11. Similarly, the power rotating around the horizontal axis is converted into rotation around the vertical axis, and then transmitted to the right middle transmission box 6. The right middle transmission box 6 transmits the power to the left middle transmission box 5, and converts it downward into power rotating around the horizontal axis.

[0031] The rotary tiller roller includes a cutter shaft 1, a cutter disc 3 and a rotary tiller blade 4. The cutter shaft 1 is set on two side plates 14 through two corresponding bearing seats. The rotary tiller blade 4 is installed on the cutter disc 3. The cutter disc 3 is rotatably installed on the cutter shaft 1 through a corresponding hollow shaft.

[0032] Specifically, the left transmission box 2 includes a first vertical bevel gear for side transmission (the right gear on the cutter shaft at the lower part of the left transmission box 2) and a second vertical bevel gear for side transmission (the left gear on the cutter shaft at the lower part of the left transmission box 2) that rotate around the cutter shaft 1 and turn in opposite directions. The first vertical bevel gear for side transmission is fixedly connected to the first to last cutter disc on the left of the cutter shaft 1 via a first hollow shaft, and the second vertical bevel gear for side transmission is connected to the second to last cutter disc on the left of the cutter shaft 1 via a second hollow shaft. The second hollow shaft is arranged outside the cutter shaft 1 via a bearing sleeve, and the first hollow shaft is arranged outside the second hollow shaft via a bearing sleeve. The first to last cutter disc on the left and the second to last cutter disc on the cutter shaft 1 turn in opposite directions. The structure of the right transmission box 8 is symmetrical to that of the left transmission box 2, and drives the first to last cutter disc on the right and the second to last cutter disc on the cutter shaft 1 to rotate coaxially and bidirectionally.

[0033] like Figure 5 and Figure 6As shown, the right intermediate transmission box 6 includes an intermediate transmission first vertical bevel gear (the fourth gear from left to right on the cutter shaft 1 of the lower part of the right intermediate transmission box 6), an intermediate transmission second vertical bevel gear (the third gear from left to right on the cutter shaft 1 of the lower part of the right intermediate transmission box 6), an intermediate transmission third vertical bevel gear (the second gear from left to right on the cutter shaft 1 of the lower part of the right intermediate transmission box 6), and an intermediate transmission fourth vertical bevel gear (the first gear from left to right on the cutter shaft 1 of the lower part of the right intermediate transmission box 6). The directions of the two adjacent vertical bevel gears are opposite, and the intermediate transmission first vertical bevel gear and the sixth cutter disc from right to left on the cutter shaft 1 are connected through the third hollow The shaft is fixedly connected, the second vertical bevel gear of the intermediate transmission is fixedly connected to the fifth cutter disc from right to left on the cutter shaft 1 through the fourth hollow shaft, the third vertical bevel gear of the intermediate transmission is fixedly connected to the fourth cutter disc from right to left on the cutter shaft 1 through the fifth hollow shaft, the fourth vertical bevel gear of the intermediate transmission is fixedly connected to the third cutter disc from right to left on the cutter shaft 1 through the sixth hollow shaft, the sixth hollow shaft is arranged outside the cutter shaft 1 through a bearing sleeve, the fifth hollow shaft is arranged outside the sixth hollow shaft through a bearing sleeve, the fourth hollow shaft is arranged outside the fifth hollow shaft through a bearing sleeve, and the third hollow shaft is arranged outside the fourth hollow shaft through a bearing sleeve. The third cutter disc and the sixth cutter disc from right to left on the cutter shaft rotate in opposite directions. The structure of the left intermediate transmission box 5 and the structure of the right intermediate transmission box 6 are symmetrically arranged, and drive the third cutter disc and the sixth cutter disc from left to right on the cutter shaft 1 to rotate coaxially and bidirectionally.

[0034] like Figure 4 and Figure 6As shown, the left transmission case 2 also includes a third vertical bevel gear (a gear on the horizontal shaft of the upper portion of the left transmission case 2) located above the first and second vertical bevel gears, and a first horizontal bevel gear (a gear on the vertical shaft of the upper portion of the left transmission case 2) meshing with the third vertical bevel gear. The tractor's output shaft is connected to the input shaft of the left gearbox 12 via a universal joint, which drives the third vertical bevel gear. A second horizontal bevel gear meshes with both the first and second vertical bevel gears, located between them. The first and second horizontal bevel gears are synchronously connected via the first vertical transmission shaft, and the second horizontal bevel gear drives the first and second vertical bevel gears to rotate synchronously and in opposite directions. After the left transmission case 2 is converted twice, the power is converted into rotation around the horizontal axis, driving the two vertical bevel gears on the cutter shaft of the lower part of the left transmission case 2 to rotate. The first vertical bevel gear of the side transmission is fixedly connected to the first to last cutter disc on the left side of the cutter shaft 1, and the rotation direction is the same. The second vertical bevel gear of the side transmission is fixedly connected to the second to last cutter disc on the left side of the cutter shaft 1, and the rotation direction is the same. Because the first vertical bevel gear of the side transmission and the second vertical bevel gear of the side transmission rotate in opposite directions, the first to last cutter disc on the left side and the second to last cutter disc on the cutter shaft 1 rotate in opposite directions, realizing coaxial bidirectional rotation of two adjacent cutter discs, thereby driving the rotary blade to rotate and complete the operation. The working principle of the right transmission case 8 is the same, so the penultimate cutter disc on the right side of the cutter shaft 1 and the penultimate cutter disc can realize coaxial bidirectional rotation.

[0035] like Figure 6As shown, the right intermediate transmission case 6 also includes an intermediate transmission first horizontal bevel gear (the horizontal bevel gear located below on the vertical axis of the upper part of the right intermediate transmission case 6) located above the intermediate transmission first vertical bevel gear, the intermediate transmission second vertical bevel gear, the intermediate transmission third vertical bevel gear, and the intermediate transmission fourth vertical bevel gear. A second horizontal bevel gear (the horizontal bevel gear located above on the vertical axis of the upper part of the right intermediate transmission case 6) is provided above the intermediate transmission first horizontal bevel gear. The left gearbox 12 transmits power to the right gearbox 11, and the right gearbox 11 drives the intermediate transmission second horizontal bevel gear to rotate. A fifth vertical bevel gear is provided between the intermediate transmission first horizontal bevel gear and the intermediate transmission second horizontal bevel gear, which is meshed with both. The fifth vertical bevel gear drives the intermediate transmission first horizontal bevel gear and the intermediate transmission second horizontal bevel gear to rotate synchronously and in opposite directions. A third horizontal bevel gear meshes between the first and fourth vertical bevel gears, driving the first and fourth vertical bevel gears to rotate synchronously and in opposite directions. A fourth horizontal bevel gear meshes between the second and third vertical bevel gears, driving the second and third vertical bevel gears to rotate synchronously and in opposite directions. The second and fourth horizontal bevel gears are synchronously connected via a second vertical transmission shaft. The first and third horizontal bevel gears are synchronously connected via a vertical hollow shaft, which is mounted on the outside of the second vertical transmission shaft via a bearing. The right intermediate transmission case 6 transmits power to the left to the left intermediate transmission case 5, converting it downward into power that rotates around a horizontal axis. After the power transmitted downward is converted into horizontal axis rotation, it drives the four vertical bevel gears on the cutter shaft of the lower part of the right intermediate transmission box 6. The four vertical bevel gears are fixedly connected to the corresponding cutter discs, so the first vertical bevel gear of the intermediate transmission on the cutter shaft of the lower part of the right intermediate transmission box 6 and the sixth cutter disc from right to left on the cutter shaft 1 have the same rotation direction, the second vertical bevel gear of the intermediate transmission and the fifth cutter disc from right to left on the cutter shaft 1 have the same rotation direction, the third vertical bevel gear of the intermediate transmission and the fourth cutter disc from right to left on the cutter shaft 1 have the same rotation direction, and the fourth vertical bevel gear of the intermediate transmission and the third cutter disc from right to left on the cutter shaft 1 have the same rotation direction. Because the four vertical bevel gears on the cutter shaft rotate in opposite directions, the cutter discs on the cutter shaft rotate in opposite directions; the gears in the left intermediate transmission box 5 and the cutter disc on the cutter shaft 1 are symmetrical with the right intermediate transmission box 6, so the cutter discs on the cutter shaft 1 from left to right rotate in opposite directions, realizing coaxial bidirectional rotation.

[0036] The rotary blades of the rotary tillage roller are arranged in a double-ended counter-spiral arrangement, which can make the force on the rotary blades more uniform and improve the soil and stubble breaking performance of the rotary blades. While breaking the soil, the soil accumulated in the middle after rotary tillage flows to both sides along the double-ended counter-spiral line, achieving two-way lateral flow of soil. The double-ended counter-spiral arrangement can also improve the stability of rotary tillage depth, avoid the large amount of straw distributed in the shallow soil layer, improve the vertical uniformity of straw in the soil, and achieve deep burial of straw. Coaxial two-way rotation can improve the soil breaking effect of the rotary blades. Combined with the double-ended counter-spiral arrangement of the blades, the rotary blades on the adjacent left and right cutter discs can clear weeds on each other's blades, preventing the phenomenon of grass entanglement on the blade roller, and also make the straw and soil mix more evenly.

[0037] In the present invention, the adjacent cutter discs on the cutter shaft 1 rotate coaxially in both directions. The input shaft of the left gearbox 12 is used to connect to the input shaft of the tractor through a universal joint. The power input by the tractor is processed by the left gearbox 12, so that the horizontal shaft rotates at a suitable speed. The power is thus divided into two. On the one hand, it is transmitted to the left transmission box 2 and the right transmission box 8 through the universal joint 9. Due to the characteristics of the bevel gear in the left transmission box 2, the upper part of the left transmission box 2 converts the rotation of the horizontal axis into the rotation of the vertical axis, and the lower part of the left transmission box 2 converts the rotation of the vertical axis into the rotation of the horizontal axis again. The left gear in the lower part of the left transmission box 2 is fixedly connected to the second-to-last cutter disc on the left side of the cutter shaft 1, and their directions of rotation are consistent. The right gear in the lower part of the left transmission box 2 is fixedly connected to the first-to-last cutter disc on the left side of the cutter shaft 1, and their directions of rotation are consistent. The left and right gears at the bottom of the left transmission case 2 rotate in different directions, so the rotation directions of the first and second cutter discs on the left side of the cutter shaft 1 are also different, achieving coaxial bidirectional rotation of the two adjacent cutter discs. The right transmission case 8 works in the same way, thereby achieving coaxial bidirectional rotation of the first and second cutter discs on the right side of the cutter shaft 1. On the other hand, the power is transmitted to the right gearbox 11, which, after steering and speed change, transmits the power to the right intermediate transmission case 6. Utilizing the characteristics of the bevel gear, the power is transmitted to the left intermediate transmission case 5 on the one hand. The left intermediate transmission case 5 controls the rotation of the third to sixth cutter discs on the cutter shaft 1 from left to right, achieving coaxial bidirectional rotation of two adjacent cutter discs. The right intermediate transmission case 6 drives the coaxial bidirectional rotation of the third to sixth cutter discs on the cutter shaft 1 from right to left, achieving coaxial bidirectional rotation of two adjacent cutter discs. The coaxial bidirectional rotation of adjacent cutter discs not only meets the requirement of uniform force on the rotary tillage blade roller, but also improves the effect of soil and stubble crushing, making the straw-soil mixing more uniform.

[0038] The present invention features a highly symmetrical structure, with a central transmission and gearbox, and symmetrical left and right transmissions. This ensures transmission requirements while avoiding unbalanced forces on the entire machine caused by having a transmission on only one side. Adjacent cutter discs on the blade shaft (1) rotate coaxially and bidirectionally, ensuring more uniform force distribution on the rotary blades. This improves soil cutting and stubble crushing, resulting in a more uniform stubble-soil mixing. The stubble rotary blade roller utilizes a double-ended helical arrangement, ensuring uniform force distribution on the rotary blades and enhancing their soil and stubble crushing performance.

[0039] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be understood by anyone familiar with the technology within the technical scope disclosed by the present invention should be included in the scope of the present invention.

Claims

1. A coaxial bidirectional rotary tiller, comprising a frame mounted on a tractor, a transmission system mounted on the frame, and a rotary tiller roller, characterized in that: The frame includes a crossbeam and two side plates fixed at both ends of the crossbeam, the transmission system includes a gearbox located in the middle of the frame, an intermediate transmission box located below the gearbox, and side transmission boxes located at both ends of the frame; the rotary tiller roller includes a cutter shaft arranged on two side plates through two bearing seats, a cutter disc mounted on the cutter shaft and rotated by a corresponding hollow shaft, and a rotary tiller mounted on the cutter disc; The tractor transmits power to the gearbox through the universal joint, and the gearbox transmits power to the intermediate transmission box and the side transmission box. The intermediate transmission box and the side transmission box drive the corresponding hollow shaft and the cutter disc to rotate, and the rotary tiller rotates with the cutter disc; The gearbox includes a right gearbox and a left gearbox, the intermediate transmission box includes a left intermediate transmission box and a right intermediate transmission box, and the side transmission box includes a left transmission box and a right transmission box; The left transmission case includes a side transmission first vertical bevel gear and a side transmission second vertical bevel gear that rotate around the cutter shaft and turn in opposite directions. The side transmission first vertical bevel gear is fixedly connected to the left-last cutter disc on the cutter shaft through a first hollow shaft, and the side transmission second vertical bevel gear is connected to the left-last cutter disc on the cutter shaft through a second hollow shaft; the second hollow shaft is arranged outside the cutter shaft through a bearing sleeve, and the first hollow shaft is arranged outside the second hollow shaft through a bearing sleeve, and the left-last cutter disc and the penultimate cutter disc on the cutter shaft turn in opposite directions; the structure of the right transmission case is symmetrical to that of the left transmission case, and drives the right-last cutter disc and the penultimate cutter disc on the cutter shaft to rotate coaxially and bidirectionally; The right intermediate transmission box includes an intermediate transmission first vertical bevel gear, an intermediate transmission second vertical bevel gear, an intermediate transmission third vertical bevel gear, and an intermediate transmission fourth vertical bevel gear that rotate around the cutter shaft. The directions of the two adjacent vertical bevel gears are opposite. The intermediate transmission first vertical bevel gear and the sixth cutter disc from right to left on the cutter shaft are fixedly connected through the third hollow shaft. The intermediate transmission second vertical bevel gear and the fifth cutter disc from right to left on the cutter shaft are fixedly connected through the fourth hollow shaft. The intermediate transmission third vertical bevel gear and the fourth cutter disc from right to left on the cutter shaft are fixedly connected through the fifth hollow shaft. The intermediate transmission fourth vertical bevel gear and The third cutter disc from right to left on the cutter shaft is fixedly connected via the sixth hollow shaft, the sixth hollow shaft is sleeved outside the cutter shaft via a bearing sleeve, the fifth hollow shaft is sleeved outside the sixth hollow shaft via a bearing sleeve, the fourth hollow shaft is sleeved outside the fifth hollow shaft via a bearing sleeve, the third hollow shaft is sleeved outside the fourth hollow shaft via a bearing sleeve, and the third cutter disc and the sixth cutter disc from right to left on the cutter shaft rotate in opposite directions; the structures of the left intermediate transmission box and the right intermediate transmission box are symmetrically arranged, and drive the third cutter disc and the sixth cutter disc from left to right on the cutter shaft to rotate in both directions on the same axis; The left transmission box further includes a side transmission third vertical bevel gear located above the side transmission first vertical bevel gear and the side transmission second vertical bevel gear, and a side transmission first horizontal bevel gear meshing with the side transmission third vertical bevel gear; A second horizontal bevel gear for side transmission is provided between the first vertical bevel gear for side transmission and the second vertical bevel gear for side transmission, and is meshed with both of them. The first horizontal bevel gear for side transmission and the second horizontal bevel gear for side transmission are synchronously connected through a first vertical transmission shaft. The right intermediate transmission box further includes an intermediate transmission first horizontal bevel gear located above the intermediate transmission first vertical bevel gear, the intermediate transmission second vertical bevel gear, the intermediate transmission third vertical bevel gear, and the intermediate transmission fourth vertical bevel gear; A second intermediate transmission horizontal bevel gear is provided above the first intermediate transmission horizontal bevel gear, and a fifth intermediate transmission vertical bevel gear is provided between the first intermediate transmission horizontal bevel gear and the second intermediate transmission horizontal bevel gear, meshing with both of them. A third intermediate transmission horizontal bevel gear is provided between the first intermediate transmission vertical bevel gear and the fourth intermediate transmission vertical bevel gear, which are meshed with both of them. A fourth intermediate transmission horizontal bevel gear is provided between the second intermediate transmission vertical bevel gear and the third intermediate transmission vertical bevel gear, which are meshed with both of them. The second horizontal bevel gear of the intermediate transmission and the fourth horizontal bevel gear of the intermediate transmission are synchronously connected through the second vertical transmission shaft, and the first horizontal bevel gear of the intermediate transmission and the third horizontal bevel gear of the intermediate transmission are synchronously connected through a vertical hollow shaft, and the vertical hollow shaft is arranged outside the second vertical transmission shaft through a bearing sleeve.

2. The coaxial bidirectional rotary tiller according to claim 1, characterized in that: The output shaft of the tractor is connected to the input shaft of the left gearbox through a universal joint, and the left gearbox drives the third vertical bevel gear of the side transmission to rotate; The left gearbox transmits power to the right gearbox, and the right gearbox drives the intermediate transmission second horizontal bevel gear to rotate.

3. The coaxial bidirectional rotary tiller according to claim 1, characterized in that: The arrangement of the rotary tillage blades of the rotary tillage blade roller adopts a double-headed reverse spiral arrangement.

4. The coaxial bidirectional rotary tiller according to claim 1, characterized in that: The left gearbox and the right gearbox are installed on the frame, the left transmission box and the right transmission box are installed on the frame through side plates on both sides, and the left intermediate transmission box and the right intermediate transmission box are installed on the knife shaft through bearings.

5. The coaxial bidirectional rotary tiller according to claim 1, characterized in that: A three-point suspension device is fixed on the crossbeam, and a soil pressing plate is installed on the side plate.

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