Reverse transmission case of agricultural combined land preparation machine

Abstract

The invention discloses a reverse transmission case of an agricultural combined land preparation machine, which relates to the technical field of combined land preparation machines and comprises a bottom frame and a reverse transmission component. In the using process, the front end of the power box is in power connection with a transmission shaft of a tractor through an input shaft, and an output shaft at the rear end of the power box reversely drives driven umbrella wheels on the front side and the rear side through a driving cone wheel, so that the driven umbrella wheels further rotate and drive first rotating rollers on the two sides through transmission rods; the multi-rod type universal joint which is in transmission connection with the first rotating roller and the second rotating roller at the other end can be located at a middle node to be bent by 90 degrees, and the requirement for 90-degree rotation of the front knife roller and the rear knife roller when the front knife roller and the rear knife roller are folded and converted into an unfolded state is met. When the combined land preparation machine moves forwards to work, the front knife roll rolls forwards to cut straw stubbles and deeply plough soil, and the rear knife roll rolls backwards to crush soil and throw the soil backwards from the top, so that the straw stubbles can be crushed and deeply buried.

Description

Technical Field

[0001] The invention relates to the technical field of combined land preparation machines, in particular to a reverse transmission box for an agricultural combined land preparation machine. Background Art

[0002] my country is the country with the largest grain output in the world and also the country with the largest straw output. Full utilization of crop straw can not only reduce the waste of resources, but also supplement soil fertility, reduce the use of chemical fertilizers, and improve the soil structure of farmland. At present, my country often uses rotary tillers to return straw to the fields. Long-term rotary tillage operations can easily cause the soil to produce a plow bottom layer, resulting in soil compaction, which seriously affects the growth of crop roots and may even cause diseases and insect pests. Moreover, rotary tillage operations cannot complete the stubble breaking operation well, and there are problems such as uneven surface after plowing. Therefore, it is necessary to have a combined land preparation machine that integrates stubble breaking, straw burying and surface leveling functions. It can complete multiple operations at one time, reduce the number of entries and thus reduce soil turning, enhance water storage and moisture retention capabilities, and is conducive to conservation tillage and energy conservation.

[0003] Combined land preparation machines are equipped with a main transmission box and a side transmission box. The power provided by the supporting tractor is output to the side transmission box of the combined land preparation machine through the main transmission box. The side transmission box is designed as a two-body, which drives the front knife roller and the rear knife roller respectively. The side transmission box is also designed as an integrated body, and its front and rear output shafts drive the front knife roller and the rear knife roller respectively. The above-mentioned side transmission boxes are all designed to meet the forward rolling direction of traditional combined land preparation machines. The soil is thrown backward from under the rear knife roller, which is not conducive to the crushing and deep burial of straw stubble. The box body adopts an integral casting process. The disadvantage is that it cannot meet the requirements of the front knife shaft rolling forward and the rear knife shaft rolling backward. The lateral dimension of the casting box body is large, which increases the lateral dimension of the machine body and requires high assembly accuracy. This adds difficulty to manufacturing, and it is also inconvenient to assemble and maintain. The overall casting weight is also large.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a reverse transmission box for an agricultural combined land preparation machine is proposed. Summary of the invention

[0005] The object of the present invention is to provide a reverse transmission box for an agricultural combined land preparation machine to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: An agricultural combined land preparation machine reverse transmission box, including a bottom frame and a reverse transmission component, the reverse transmission component is fixed at the bottom of the bottom frame, and the reverse transmission component includes a power box, an input shaft, an output shaft, a driving cone pulley, a driven bevel gear, a transmission rod, a first roller, a bearing seat one, a universal joint, a second roller and a cutter roller. The front end of the power box is fixedly connected with an input shaft, and the rear end of the power box is fixedly connected with an output shaft. Two driving cone pulleys are coaxially fixed at the output shaft, and the two driving cone pulleys in opposite directions are respectively engaged with two driven bevel gears in opposite directions. A transmission rod is coaxially fixed in the middle of the driven bevel gear, and the two ends of the transmission rod are coaxially connected with a first roller. The first roller rotates inside the bearing seat one, and a universal joint is connected to the outside of the first roller. The end of the universal joint away from the first roller rotates and drives a second roller, and a cutter roller is connected to the outside of the second roller.

[0007] Further, the front end of the power box is power-connected to the tractor transmission shaft through the input shaft, and the output shaft at the rear end of the power box reversely drives the driven bevel gears on both front and rear sides through the driving cone pulley.

[0008] Further, the first roller rotates and drives the second roller at the other end through the universal joint, and the multi-rod universal joint can be bent at a 90-degree angle at the middle node, and the second roller and the cutter roller rotate and drive coaxially.

[0009] Further, a top plate is welded and fixed to the top of the bottom frame, and the front end of the top plate is hung on the tractor through a hanging bracket, and wing plates are symmetrically fixed at both front and rear ends of the top plate.

[0010] Further, folding and retracting components are symmetrically arranged at both front and rear ends of the top plate. The folding and retracting components include an oil cylinder, a toothed plate and a limiting strip. The oil cylinder is connected to the tractor oil circuit system, and the output end of the oil cylinder is fixedly connected with a toothed plate. The toothed plate is slidably installed outside the limiting strip, and the limiting strip is fixed to the top plate.

[0011] Further, the folding and retracting components further include a rack and a front toothed ring. A rack is fixed in the middle of the bottom of the toothed plate, and the front toothed ring is meshed and driven on both sides of the front end of the toothed plate, and the front toothed ring is rotationally connected to the front wing plate.

[0012] Further, the folding and retracting components further include a bearing seat two. A bearing seat two is fixed to the middle rib of the front toothed ring, and the bearing seat two is rotationally matched with the second roller.

[0013] Further, the folding and retracting components further include a steering gear and a rear toothed ring. The steering gear is meshed and driven on both sides of the rear end of the toothed plate, and the side of the steering gear away from the toothed plate is meshed and driven with the rear toothed ring. The rear toothed ring is rotationally connected to the rear wing plate, and the rotation direction of the rear toothed ring is opposite to that of the front toothed ring.

[0014] Furthermore, linkage lifting components are arranged at both ends of the middle part of the top plate. The linkage lifting components include brackets, rotating wheels and control wheels. The brackets are fixed inside the notch at the top of the bottom frame, and rotating wheels are rotatably installed inside the brackets. The rotating wheels are meshed and driven with the racks, and control wheels are coaxially connected to both sides of the rotating wheels.

[0015] Furthermore, the linkage lifting components further include lifting rods, mounting seats and traveling wheels. The control wheels are meshed and driven with the lifting rods. The lifting rods slide inside the mounting seats, and traveling wheels are connected to the bottom ends of the lifting rods.

[0016] The present invention provides a reverse transmission case for an agricultural combined land preparation machine, which has the following beneficial effects; 1. During the use of the present invention, the front end of the power box is power-connected to the tractor transmission shaft through the input shaft, and the output shaft at the rear end of the power box transmits power in the reverse direction to the front and rear driven bevel gears on both sides through the driving cone wheel. As a result, the driven bevel gears further transmit power in the rotational direction to the two roller 1s on both sides through the transmission rods. Roller 1 transmits power in the rotational direction to the other roller 2 through the universal joint. The multi-rod universal joint connecting the two can be bent at a 90-degree angle at the middle node, meeting the 90-degree rotation requirement for the front and rear cutter rollers to be folded and transformed into the horizontal unfolded state. The driving cone wheel transmits power in the reverse direction to the corresponding front and rear cutter rollers through the driven bevel gears with opposite directions on both sides. When the combined land preparation machine moves forward for operation, the front cutter roller rolls forward to cut the straw stubbles and deeply till the soil, and the rear cutter roller rolls backward to break the soil and throw the soil backward from above. This is beneficial for the deep burial of the crushed straw stubbles. The structure is simple and easy to assemble.

[0017] 2. During the use of the present invention, the toothed plate is pulled by the oil cylinder to slide outside the limiting strip. First, the toothed plate is meshed and driven with the front toothed rings on both sides of the front end. The front toothed rings rotate counterclockwise by 90 degrees, making the bearing seat 2 parallel to the front end wing plate. Secondly, the rear end of the toothed plate is meshed and driven with the rear toothed ring through the steering gear. The rear toothed ring rotates clockwise by 90 degrees, making the bearing seat 2 parallel to the rear end wing plate. Through the opposite-direction rotation of the front toothed ring and the rear toothed ring, the front and rear cutter rollers can be folded in the front and rear opposite directions, which not only avoids interference with the middle traveling wheels but also can greatly reduce the width of the combined land preparation machine in the folded state, meeting the walking requirements of the combined land preparation machine on the narrow rural roads with width limits. Compared with the "middle" - shaped structure in the prior art where the main frame middle beam controls the folding and retraction through two oil cylinders, the present application only needs to use one oil cylinder to control the synchronous folding and retraction of the front and rear cutter rollers, with stronger applicability.

[0018] 3. During the use of the present invention, when the tooth plate slides due to the pull of the oil cylinder, the rack at the middle end of the bottom of the tooth plate meshes with the rotating wheel inside the bracket for transmission, and the rotating wheel further meshes with the lifting rod through the coaxial control wheels on both sides to control the lifting and lowering of the lifting rod in the mounting seat. While the front and rear knife rollers are horizontally unfolded, the walking wheels on both sides of the middle are synchronously retracted, so that the front and rear knife rollers only touch the ground in the working state to prevent the knife rollers from being damaged by collision during transportation. Similarly, the present application only needs the setting of one oil cylinder to control the synchronous folding and retraction of the front and rear knife rollers, and can also control the lifting and lowering of the walking wheels in a linkage manner. The two cooperate closely, the design is reasonable, and the applicability is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention; Figure 2 It is a schematic diagram of the split structure of the device of the present invention; Figure 3 This is a schematic diagram of the structure of the foldable and retractable assembly of the present invention; Figure 4 It is a schematic diagram of the structure of the linkage lifting assembly of the present invention; Figure 5 It is a schematic diagram of the overall structure of the reverse transmission assembly of the present invention; Figure 6 It is a partially enlarged structural schematic diagram of the reverse transmission component of the present invention.

[0020] In the figure: 1. bottom frame; 2. reverse transmission assembly; 201. power box; 202. input shaft; 203. output shaft; 204. driving cone wheel; 205. driven umbrella wheel; 206. transmission rod; 207. roller 1; 208. bearing seat 1; 209. universal joint; 210. roller 2; 211. knife roller; 3. top plate; 4. hanger; 5. wing plate; 6. folding and retracting assembly; 601. oil cylinder; 602. tooth plate; 603. limit strip; 604. rack; 605. front gear ring; 606. bearing seat 2; 607. steering gear; 608. rear gear ring; 7. linkage lifting assembly; 701. bracket; 702. rotating wheel; 703. control wheel; 704. lifting rod; 705. mounting seat; 706. walking wheel. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are further described in detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention. See also Figures 1 to 6, the present invention provides a technical solution: an agricultural combined land preparation machine reverse transmission box, including a bottom frame 1 and a reverse transmission assembly 2. The reverse transmission assembly 2 is fixed to the bottom of the bottom frame 1. The reverse transmission assembly 2 includes a power box 201, an input shaft 202, an output shaft 203, a driving cone pulley 204, a driven bevel gear 205, a transmission rod 206, a first roller 207, a bearing seat 208, a universal joint 209, a second roller 210, and a cutter roller 211. The front end of the power box 201 is fixedly connected to the input shaft 202, and the rear end of the power box 201 is fixedly connected to the output shaft 203. There are two driving cone pulleys 204 coaxially fixed to the output shaft 203, and the two driving cone pulleys 204 in the front and rear are respectively engaged with two driven bevel gears 205 in opposite directions. The middle of the driven bevel gear 205 is coaxially fixed with a transmission rod 206, and the two ends of the transmission rod 206 are coaxially connected to the first roller 207. The first roller 207 rotates inside the bearing seat 208, and a universal joint 209 is connected to the outside of the first roller 207. The end of the universal joint 209 away from the first roller 207 rotates and drives the second roller 210, and the cutter roller 211 is connected to the outside of the second roller 210. The front end of the power box 201 is power-connected to the tractor transmission shaft through the input shaft 202, and the output shaft 203 at the rear end of the power box 201 reversely drives the driven bevel gears 205 on both sides through the driving cone pulley 204. The first roller 207 rotates and drives the second roller 210 at the other end through the universal joint 209, and the multi-rod universal joint 209 can be bent at a 90-degree angle at the middle node, and the second roller 210 and the cutter roller 211 rotate coaxially and are driven; The specific operation is as follows. The front end of the power box 201 is power-connected to the tractor transmission shaft through the input shaft 202, and the output shaft 203 at the rear end of the power box 201 reversely drives the driven bevel gears 205 on both sides through the driving cone pulley 204, so that the driven bevel gear 205 further rotates and drives the first roller 207 on both sides through the transmission rod 206. The first roller 207 rotates and drives the second roller 210 at the other end through the universal joint 209, and the multi-rod universal joint 209 connecting the two can be bent at a 90-degree angle at the middle node, meeting the 90-degree rotation requirement for the front and rear cutter rollers 211 to be folded and transformed into a horizontally unfolded state. The driving cone pulley 204 reversely drives the corresponding front and rear cutter rollers 211 through the driven bevel gears 205 in opposite directions on both sides, so that when the combined land preparation machine moves forward for operation, the front cutter roller 211 rolls forward to cut the straw stubble, deeply till the soil, and the rear cutter roller 211 rolls backward to break the soil and throw the soil backward from above. This is beneficial to the deep burial of the straw stubble after crushing, and the structure is simple and easy to assemble; Please refer to Figures 1 to 3, a top plate 3 is fixedly welded to the top of the bottom frame 1, and the front end of the top plate 3 is hung on a tractor through a hanging bracket 4. Wings 5 are symmetrically fixed at both the front and rear ends of the top plate 3. Folding retraction and extension assemblies 6 are symmetrically arranged at both the front and rear ends of the top plate 3. The folding retraction and extension assembly 6 includes an oil cylinder 601, a toothed plate 602, and a limiting strip 603. The oil cylinder 601 is connected to the oil circuit system of the tractor, and the output end of the oil cylinder 601 is fixedly connected to the toothed plate 602. The toothed plate 602 is slidably installed outside the limiting strip 603, and the limiting strip 603 is fixed to the top plate 3. The folding retraction and extension assembly 6 further includes a rack 604 and a front toothed ring 605. A rack 604 is fixed to the middle of the bottom of the toothed plate 602, and front toothed rings 605 are meshed and driven on both sides of the front end of the toothed plate 602. The front toothed ring 605 is rotatably connected to the front wing 5. The folding retraction and extension assembly 6 further includes a second bearing seat 606. A second bearing seat 606 is fixed to the rib of the middle of the front toothed ring 605, and the second bearing seat 606 is rotationally matched with a second roller 210. The folding retraction and extension assembly 6 further includes a steering gear 607 and a rear toothed ring 608. Steering gears 607 are meshed and driven on both sides of the rear end of the toothed plate 602, and the side of the steering gear 607 away from the toothed plate 602 is meshed and driven with the rear toothed ring 608. The rear toothed ring 608 is rotatably connected to the rear wing 5, and the rotation direction of the rear toothed ring 608 is opposite to that of the front toothed ring 605; The specific operation is as follows. The toothed plate 602 is pulled by the oil cylinder 601 to slide outside the limiting strip 603. First, the toothed plate 602 is meshed and driven with the front toothed rings 605 on both sides of the front end. The front toothed ring 605 rotates counterclockwise by 90 degrees, making the second bearing seat 606 parallel to the front wing 5. Second, the rear end of the toothed plate 602 is meshed and driven with the rear toothed ring 608 through the steering gear 607. The rear toothed ring 608 rotates clockwise by 90 degrees, making the second bearing seat 606 parallel to the rear wing 5. Through the opposite rotation of the front toothed ring 605 and the rear toothed ring 608, the front and rear cutter rollers 211 can be folded in opposite directions, which not only avoids interference with the middle traveling wheels 706 but also can greatly reduce the width of the combined land preparation machine in the folded state, meeting the walking requirements of the combined land preparation machine of the present application on the narrow rural roads with width limits. Compared with the "middle" - shaped structure in the prior art where the main frame middle beam controls the folding and retraction through two oil cylinders 601, the present application only needs to use one oil cylinder 601 to control the synchronous folding and retraction of the front and rear cutter rollers 211, with stronger applicability; Please refer to Figures 1 to 4, linkage lifting components 7 are arranged at both ends of the middle part of the top plate 3. The linkage lifting components 7 include brackets 701, rotating wheels 702 and control wheels 703. The brackets 701 are fixed inside the notch at the top of the bottom frame 1, and a rotating wheel 702 is rotatably installed inside the brackets 701. The rotating wheel 702 is meshed and driven with the rack 604, and control wheels 703 are coaxially connected to both sides of the rotating wheel 702. The linkage lifting components 7 further include lifting rods 704, mounting seats 705 and traveling wheels 706. The control wheels 703 are meshed and driven with the lifting rods 704, and the lifting rods 704 slide inside the mounting seats 705, and the bottom ends of the lifting rods 704 are connected with the traveling wheels 706; The specific operation is as follows. During the process of the toothed plate 602 sliding under the pulling of the oil cylinder 601, the rack 604 at the middle end of the bottom of the toothed plate 602 is meshed and driven with the rotating wheel 702 inside the bracket 701. The rotating wheel 702 further controls the lifting of the lifting rod 704 located inside the mounting seat 705 through the meshing of the control wheels 703 coaxially arranged on both sides with the lifting rod 704. While the front and rear cutter rollers 211 are horizontally unfolded, the traveling wheels 706 on both sides of the middle part are simultaneously retracted, so that the front and rear cutter rollers 211 only touch the ground in the working state, preventing the cutter rollers 211 from being knocked and damaged during transportation. Similarly, with only one oil cylinder 601 set in this application, the synchronous folding and retraction of the front and rear cutter rollers 211 can be controlled, and the lifting of the traveling wheels 706 can also be controlled in a linkage manner. The two cooperate closely, are reasonably designed, and have stronger applicability.

[0022] In summary, when the reverse transmission box of the agricultural combined tiller is used, the gear plate 602 is pulled by the oil cylinder 601 to slide outside the limit bar 603. First, the gear plate 602 is meshed with the front gear rings 605 on both sides of the front end for transmission, and the front gear rings 605 are rotated counterclockwise by ninety degrees to make the bearing seat 2 606 parallel to the front end wing plate 5. Secondly, the rear end of the gear plate 602 is meshed with the rear gear ring 608 through the steering gear 607, and the rear gear ring 608 is rotated clockwise by ninety degrees to make the bearing seat 2 606 parallel to the rear end wing plate 5. The front gear ring 605 and the rear gear ring 608 are rotated in opposite directions, so that the front and rear knife rollers 211 can be folded in opposite directions to the front and rear, thereby avoiding the collision with the middle walking wheel 706. Interference can also greatly reduce the width of the combined land preparation machine of the present application in the folded state, meeting the walking needs of the combined land preparation machine of the present application on country roads with limited width. Compared with the "Zhong"-shaped structure in which the middle beam of the main frame of the prior art is controlled by two oil cylinders 601 to control the folding and retraction, the present application only needs to use one oil cylinder 601 to control the synchronous folding and retraction of the front and rear knife rollers 211, which has stronger applicability. When the tooth plate 602 is pulled by the oil cylinder 601 to slide, the rack 604 at the middle end of the bottom of the tooth plate 602 is meshed with the rotating wheel 702 inside the bracket 701 for transmission, and the rotating wheel 702 is further meshed with the lifting rod 704 through the coaxial control wheels 703 on both sides, so as to control the lifting of the lifting rod 704 in the mounting seat 705. When the front and rear knife rollers 211 are horizontally unfolded, the walking wheels 706 on both sides of the middle are synchronously retracted, so that the front and rear knife rollers 211 only touch the ground in the working state, so as to prevent the knife rollers 211 from being damaged by bumps during transportation. Similarly, the present application only needs the setting of one oil cylinder 601 to control the synchronous folding and retracting of the front and rear knife rollers 211, and can also control the lifting and lowering of the walking wheels 706 in linkage. The two are closely matched, reasonably designed, and more applicable. When in use, the front end of the power box 201 is connected to the tractor drive shaft power through the input shaft 202, and the output shaft 203 at the rear end of the power box 201 drives the driven umbrella wheels 205 on the front and rear sides in the reverse direction through the driving cone wheel 204, so that the driven umbrella wheels 205 are driven by the transmission rod 206 further rotates to the rollers 1 207 on both sides, and the rollers 1 207 rotates to the rollers 2 210 at the other end through the universal joint 209, and the multi-rod universal joint 209 connecting the two can be bent at 90 degrees at the middle node to meet the 90-degree rotation requirement of the front and rear knife rollers 211 being folded and transformed into a horizontally unfolded state, and the driving cone wheel 204 drives the corresponding front and rear knife rollers 211 in the opposite direction through the driven umbrella wheels 205 on both sides, so that when the combined land preparation machine moves forward, the front knife roller 211 rolls forward to cut the straw stubble and deeply plow the soil, and the rear knife roller 211 rolls backward to crush the soil and throws the soil backward from the top, which is conducive to crushing and burying the straw stubble, and the structure is simple and easy to assemble.

[0023] Embodiments of the present invention are provided for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications suited to the particular use contemplated.

Claims

1. A reverse transmission box for an agricultural combined land preparation machine, characterized in that: The invention comprises a bottom frame (1) and a reverse transmission assembly (2), wherein the bottom of the bottom frame (1) is fixed with the reverse transmission assembly (2), and the reverse transmission assembly (2) comprises a power box (201), an input shaft (202), an output shaft (203), a driving cone wheel (204), a driven bevel wheel (205), a transmission rod (206), a first rotating roller (207), a first bearing seat (208), a universal joint (209), a second rotating roller (210) and a knife roller (211), wherein the front end of the power box (201) is fixedly connected to the input shaft (202), and the rear end of the power box (201) is fixedly connected to the output shaft (203), and the output shaft (203) is fixedly connected to the output shaft (203). ) are coaxially fixed with two front and rear driving cone wheels (204), and the front and rear driving cone wheels (204) are respectively meshed with two driven umbrella wheels (205) in opposite directions, a transmission rod (206) is coaxially fixed in the middle of the driven umbrella wheel (205), and two ends of the transmission rod (206) are coaxially connected with a roller one (207), the roller one (207) rotates inside a bearing seat one (208), and a universal joint (209) is connected to the outer side of the roller one (207), and a roller two (210) is rotatably transmitted at one end of the universal joint (209) away from the roller one (207), and a knife roller (211) is connected to the outer side of the roller two (210).

2. The reverse transmission box of an agricultural combined land preparation machine according to claim 1, characterized in that: The front end of the power box (201) is connected to the tractor transmission shaft through an input shaft (202), and the output shaft (203) at the rear end of the power box (201) is reversely driven to the driven bevel wheels (205) at the front and rear sides through a driving cone wheel (204).

3. The reverse transmission box of the agricultural combined land preparation machine according to claim 1, characterized in that: The rotating roller 1 (207) is driven to rotate toward the rotating roller 2 (210) at the other end via the universal joint (209), and the multi-rod universal joint (209) can be bent at 90 degrees at the middle node, and the rotating roller 2 (210) and the knife roller (211) are driven to rotate coaxially.

4. The reverse transmission box of the agricultural combined land preparation machine according to claim 1, characterized in that: A top plate (3) is welded and fixed to the top of the bottom frame (1), and the front end of the top plate (3) is connected to the tractor via a hanging bracket (4), and wing plates (5) are symmetrically fixed to the front and rear ends of the top plate (3).

5. The reverse transmission box of the agricultural combined land preparation machine according to claim 4, characterized in that: The top plate (3) is symmetrically provided with folding and retracting components (6) at the front and rear ends. The folding and retracting components (6) comprise an oil cylinder (601), a tooth plate (602) and a limit bar (603). The oil cylinder (601) is connected to the tractor oil system, and the output end of the oil cylinder (601) is fixedly connected to the tooth plate (602). The tooth plate (602) is slidably mounted on the outside of the limit bar (603), and the limit bar (603) is fixed to the top plate (3).

6. The reverse transmission box of the agricultural combined land preparation machine according to claim 5, characterized in that: The folding and retracting assembly (6) further comprises a rack (604) and a front toothed ring (605); the rack (604) is fixed to the middle of the bottom of the toothed plate (602); the front toothed ring (605) is meshed and driven on both sides of the front end of the toothed plate (602); and the front toothed ring (605) is rotatably connected to the front wing plate (5).

7. The reverse transmission box of the agricultural combined land preparation machine according to claim 6, characterized in that: The folding and retracting assembly (6) further comprises a second bearing seat (606), the middle rib of the front gear ring (605) is fixed with the second bearing seat (606), and the second bearing seat (606) is rotatably matched with the second rotating roller (210).

8. The reverse transmission box of the agricultural combined land preparation machine according to claim 7, characterized in that: The folding and retracting assembly (6) further comprises a steering gear (607) and a rear gear ring (608); the steering gears (607) are meshed and transmitted on both sides of the rear end of the toothed plate (602); and the side of the steering gear (607) facing away from the toothed plate (602) is meshed and transmitted with the rear gear ring (608); the rear gear ring (608) is rotatably connected to the rear end wing plate (5), and the rear gear ring (608) rotates in opposite directions to the front gear ring (605).

9. The reverse transmission box of the agricultural combined land preparation machine according to claim 4, characterized in that: Linked lifting components (7) are arranged at both ends of the middle part of the top plate (3), and the linked lifting components (7) comprise a bracket (701), a rotating wheel (702) and a control wheel (703). The bracket (701) is fixed inside a notch at the top of the bottom frame (1), and a rotating wheel (702) is rotatably mounted inside the bracket (701). The rotating wheel (702) is meshed with a rack (604) for transmission, and control wheels (703) are coaxially connected to both sides of the rotating wheel (702).

10. The reverse transmission box of the agricultural combined land preparation machine according to claim 9, characterized in that: The linkage lifting assembly (7) further comprises a lifting rod (704), a mounting seat (705) and a running wheel (706); the control wheel (703) is meshed with the lifting rod (704) for transmission, the lifting rod (704) slides inside the mounting seat (705), and the bottom end of the lifting rod (704) is connected to the running wheel (706).

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