Sugarcane ridge-breaking stumping machine with stumping cutterhead capable of floating by simulating terrain

Abstract

The utility model provides a sugarcane ridge-breaking stumping machine with a stumping cutter head capable of floating in a terrain-imitating manner, a stumping device and a rotary tillage device are arranged on a frame of the sugarcane ridge-breaking stumping machine, a depth wheel is arranged between the stumping device and the rotary tillage device, and a main transmission shaft is arranged on the frame above the stumping device; the stumping device is provided with an auxiliary rack which can move up and down relative to the rack below the front end of the rack; the middle part of the auxiliary rack is respectively connected with a stumping cutter through a left transmission gear box and a right transmission gear box which are symmetrically arranged; the main transmission shaft drives the two transmission gear boxes at the same time through a set of chain transmission assembly with an elastic tensioning structure, so that the two stumping cutter heads rotate; the left end and the right end of the auxiliary machine frame are further provided with a left contour wheel and a right contour wheel on the outer sides of the two stumping cutter heads. No matter the machine works in flat ground, uphill or downhill terrains, the cutting blades of the stumping cutter head can be well kept on the surface of the ridge top or a position with a certain depth in soil, and the phenomenon that perennial roots of sugarcanes are damaged or stubbles of the sugarcanes are too long due to uphill or downhill is avoided.

Description

Technical Field

[0001] The utility model relates to an agricultural machine for managing sugarcane perennial roots, in particular to a sugarcane ridge breaking and stubble leveling machine with a stubble leveling cutter disc capable of floating in imitation of terrain, belonging to the technical field of agricultural machinery and equipment. Background Art

[0002] Sugarcane ratoons refer to the sugarcane stumps left in the field after the previous year's harvest. With proper agricultural management, the sugarcane ratoons can sprout again and grow into sugarcane plants the following year. Sugarcane ratoons typically last for 2-3 years, but can extend up to 4-5 years. Therefore, sugarcane grown from sugarcane ratoons accounts for over two-thirds of the sugarcane cultivated area. However, after harvesting, especially manual harvesting, the sugarcane ratoons left in the field often rise above the ground. Without proper stubble removal, ridge breaking, loosening the stumps, applying base fertilizer, and covering with soil and film, the sugarcane stubble that emerges above the ground will quickly sprout and grow at this elevated position. Without adequate soil cover and fertilizer nourishment for the roots, the sugarcane seedlings will lack sufficient nutrients during growth, leading to plant death or failure to thrive, seriously affecting sugarcane yield. Therefore, timely agricultural management of sugarcane ratoons is necessary after the sugarcane harvest.

[0003] my country's sugarcane is mostly grown in the hilly and mountainous areas of southern China, where sugarcane fields are mostly hilly and sloping. Existing sugarcane perennial root stubble cutting equipment on the market is generally suspended and driven by a tractor. The cutting depth control of the stubble cutting device is generally achieved through hydraulic lifting and adjustment and depth-limiting wheel depth control. The specific control principle is to first raise the depth-limiting wheel to a sufficiently high position. Then, during operation, the tractor's hydraulic lifting device is used to adjust the stubble cutting disc to a predetermined cutting depth as needed. At this point, the tractor stops operation and maintains the cutting tip at a predetermined depth in the soil. The depth-limiting wheel is lowered until it contacts the ground and then fixed, thereby achieving stubble cutting at the set depth. This stubble cutting depth control method cannot adaptively adjust to changes in terrain and can only be adjusted manually. When working on uphill terrain, the cutter disc may penetrate too deep into the soil, damaging the perennial roots of the sugarcane. When working on downhill terrain, the cutting depth may not be sufficient, resulting in excessively long sugarcane stubble. Once adjusted and fixed, the depth-limiting wheel only limits the cutting disc to a certain cutting depth. This works well for leveling sugarcane fields, but it fails to maintain a constant cutting depth in undulating sugarcane fields. Consequently, the cutting discs used in existing sugarcane perennial root stubble removal equipment are unable to adequately control cutting depth in undulating sugarcane fields. Furthermore, most existing stubble removal discs utilize hydraulic motors to drive their rotation, requiring a corresponding hydraulic control system. This results in a complex structure and inconvenient maintenance. Utility Model Content

[0004] The purpose of the utility model is to provide a sugarcane ridge breaking and stubble leveling machine with a stubble leveling cutter disc that can float in imitation of the terrain. The stubble leveling cutter disc equipped with the machine can make adaptive floating adjustments according to the undulating changes in the terrain of the sugarcane field, thereby achieving a better stubble leveling effect. Moreover, the stubble leveling cutter disc is driven by a purely mechanical chain transmission, with high transmission efficiency, simple structure and easy maintenance.

[0005] The specific technical solutions of the utility model are as follows:

[0006] A sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling cutter disc that can float in imitation of the terrain is provided with a frame, a stubble-leveling device is provided at the lower front end of the frame, a rotary tillage device is provided at the rear of the stubble-leveling device, a depth-limiting wheel is provided at a position centered on the left and right sides of the frame and located between the stubble-leveling device and the rotary tillage device via a downwardly extending intermediate wheel frame, a main transmission shaft is provided at the front end of the frame at a position centered on the left and right sides above the stubble-leveling device, a universal coupling is connected to the front end of the main transmission shaft, the universal shaft coupling receives the PTO output power of the matching tractor and transmits the power to the stubble-leveling device and the rotary tillage device via the main transmission shaft.

[0007] The stubble-leveling device is provided with a sub-frame at the lower front end of the frame, and the upper end of the sub-frame is slidably connected to the sliding bearings installed correspondingly on the frame through sliding guide columns, so that the sub-frame can move up and down relative to the frame; the lower end of the middle part of the sub-frame is fixedly connected to two symmetrically arranged transmission gearboxes on the left and right, and the transmission gearbox is provided with an input shaft extending backward and an output shaft extending downward, and the output ends of the two transmission gearboxes are respectively connected to a stubble-leveling cutter disc, and the main transmission shaft drives the input shafts of the two transmission gearboxes to rotate at the same time through a set of chain transmission components with an elastic tensioning structure. The auxiliary frame is provided with left and right contour wheels on the outer sides of the two stubble cutter discs respectively through front wheel frames extending obliquely forward and downward at the left and right ends of the auxiliary frame, and elastic pushing mechanisms for swinging the front wheel frames downward are respectively provided on the front ends of the left and right front wheel frames of the auxiliary frame. The elastic pushing mechanisms elastically push the front wheel frames to keep the contour wheels elastically pressed against the bottom surface of the ridges in the sugarcane field, thereby driving the stubble cutter discs to achieve contour cutting and stubble leveling of the sugarcane field.

[0008] The stubble leveling device of this sugarcane ridge-breaking and stubble-leveling machine is equipped with a stubble-leveling disc that floats up and down with the auxiliary frame. The contoured wheels drive the auxiliary frame and stubble-leveling disc to float up and down accordingly according to the undulations of the ridge bottom. Whether operating on flat ground, uphill, or downhill terrain, the stubble-leveling disc can effectively maintain a certain cutting depth. This prevents the cutting blades from penetrating too deeply into the soil on uphill slopes, potentially damaging sugarcane perennial roots, or from being lifted too high off the ground on downhill slopes, resulting in excessively long sugarcane stubble. Furthermore, the stubble-leveling disc of this sugarcane ridge-breaking and stubble-leveling machine is driven by a purely mechanical chain drive, equipped with an elastic tensioning structure to keep the chain constantly taut. This not only effectively meets the stubble-leveling disc's floating requirements, but also offers higher transmission efficiency than conventional hydraulic motor drives. Furthermore, it has the advantages of a simple structure, low cost, easy assembly and disassembly, and ease of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the three-dimensional structure of the sugarcane ridge breaking and stubble leveling machine.

[0010] Figure 2 This is a right side schematic diagram of the sugarcane ridge breaker and stubble leveler.

[0011] Figure 3 This is a schematic diagram of the three-dimensional structure of the stubble leveling device of the sugarcane ridge breaking and stubble leveling machine.

[0012] Figure 4 This is a rear side schematic diagram of the stubble leveling device of this sugarcane ridge breaking and stubble leveling machine.

[0013] Figure 5 This is a schematic diagram of the positions of the deep-limiting wheel, stubble cutter disc and profiling wheel of this sugarcane ridge breaker when working on flat ground.

[0014] Figure 6 This is a schematic diagram of the positions of the deep-limiting wheel, stubble cutter disc and contouring wheel of this sugarcane ridge breaker when working on uphill terrain.

[0015] Figure 7 This is a schematic diagram of the positions of the deep-limiting wheel, stubble cutter disc and contouring wheel of this sugarcane ridge breaker when working on downhill terrain.

[0016] In the figure: 1-frame, 1.1-sliding bearing, 1.2-hinge seat, 1.3-upper hanging ear, 1.4-lower hanging ear, 2-stubble device, 3-rotary tillage device, 4-intermediate wheel frame, 5-depth limiting wheel, 6-main transmission shaft, 7-universal coupling, 8-auxiliary frame, 8.1-sliding guide column, 9-transmission gear box, 10-stubble cutter disc, 11-front wheel frame, 12-profiling wheel, 13-driving sprocket, 14-driven sprocket, 15-chain ring, 16-guide sprocket, 17-tensioning sprocket, 18-swing arm, 19-tension spring, 20-jack, 21-support arm, 22-sleeve, 23-adjusting spring, 24-fertilization device, 25-soil covering and film covering device, 26-transmission box, 27-mounting seat, 28-drip irrigation pipe laying device. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings. In the description of the present invention, the directional words "front", "rear", "left" and "right" are defined based on the perspective of the tractor driver facing forward when operating the sugarcane ridge breaker.

[0018] like Figure 1-Figure 4 As shown, the sugarcane ridge breaker and stubble leveler is provided with a frame 1, a stubble leveling device 2 is provided at the lower front end of the frame 1, a rotary tillage device 3 is provided behind the stubble leveling device 2, a depth limiting wheel 5 is provided at a position centered on the left and right sides of the frame 1 and located between the stubble leveling device 2 and the rotary tillage device 3 through a downwardly extending intermediate wheel frame 4, a main transmission shaft 6 is provided at the front end of the frame 1 at a position centered on the left and right sides above the stubble leveling device 2, a universal joint 7 is connected to the front end of the main transmission shaft 6, and the universal joint coupling 7 receives the PTO output power of the matching tractor and transmits the power to the stubble leveling device 2 and the rotary tillage device 3 through the main transmission shaft 6.

[0019] The stubble-leveling device 2 is provided with a sub-frame 8 below the front end of the frame 1. The upper end of the sub-frame 8 is slidably connected to the sliding bearing 1.1 installed correspondingly on the frame 1 through a sliding guide column 8.1, so that the sub-frame 8 can move up and down relative to the frame 1; the lower end of the middle part of the sub-frame 8 is fixedly connected to two symmetrically arranged transmission gearboxes 9 on the left and right. The transmission gearbox 9 is provided with an input shaft extending backward and an output shaft extending downward. The output ends of the two transmission gearboxes 9 are each connected to a stubble-leveling cutter disc 10. The main transmission shaft 6 drives the input shafts of the two transmission gearboxes 9 to rotate at the same time through a set of chain transmission components with an elastic tensioning structure. The output shafts of the two transmission gear boxes 9 drive the two stubble cutter discs 10 to rotate; the left and right ends of the sub-frame 8 are respectively provided with left and right profiling wheels 12 on the outside of the two stubble cutter discs 10 through front wheel frames 11 extending obliquely forward and downward, and the upper ends of the front wheel frames 11 are hinged on the sub-frame 8. The sub-frame 8 is also respectively provided with elastic pushing mechanisms at the front ends of the left and right front wheel frames 11 for swinging the front wheel frames 11 downward. The elastic pushing mechanisms elastically push the front wheel frames 11 so that the profiling wheels 12 remain elastically pressed against the bottom surface of the ridges of the sugarcane field, thereby driving the stubble cutter discs 10 to achieve profiling cutting and stubble cutting of the sugarcane field.

[0020] Furthermore, the chain transmission assembly is provided with a driving sprocket 13 fixedly connected to the main transmission shaft 6, two driven sprockets 14 fixedly connected to the input shafts of the two transmission gear boxes 9 below the driving sprocket 13, a chain ring 15 that surrounds the outer periphery of the driving sprocket 13 and the two driven sprockets 14 and forms an engagement, and a guide sprocket 16 fixedly mounted on the auxiliary frame 8 and located above the two driven sprockets 14 and meshing with the chain ring 15 from the outside; the elastic tensioning structure is provided with left and right tensioning sprockets 17 that mesh with the chain ring 15 from the outside of the left and right sides and tension the chain ring 15, and the two tensioning sprockets 17 are respectively mounted on the upper ends of two left and right swing arms 18 arranged in an eight-shaped shape, and a tension spring 19 is provided between the upper ends of the two swing arms 18 for lateral elastic pulling, and the lower ends of the two swing arms 18 are respectively hinged to the hinge seats 1.2 installed correspondingly on the frame 1.

[0021] Furthermore, the chain transmission assembly can be replaced by a belt transmission assembly.

[0022] Furthermore, mounting brackets 27 are provided on the left and right ends of the sub-frame 8, which are movable and lockable along the sub-frame 8. The mounting brackets 27 are fixed to the sub-frame 8 via U-shaped screws. The upper ends of the left and right front wheel frames 11 are respectively hinged to the mounting brackets 27 at the left and right ends of the sub-frame, and the left and right elastic pushing mechanisms are also correspondingly mounted on the left and right mounting brackets 27. By adjusting the position of the left and right mounting brackets 27 on the sub-frame 8, the spacing between the left and right contour wheels 12 can be changed to match the spacing of the furrows on both sides of the sugarcane ridge. Furthermore, the elastic pushing mechanism is provided with a forward-inclined push rod 20, the lower end of the push rod 10 is hinged on the front wheel frame 11, and the mounting seat 27 is fixed with a forward-extending support arm 21 above the front wheel frame 11. The front end of the support arm 21 is hinged with a sliding sleeve 22. The upper end of the push rod 10 slides through the sliding sleeve 22 and is fastened with an upper nut. The push rod 20 is sleeved with an adjusting spring 23 on the rod body below the sliding sleeve 22 and is provided with a lower nut to press the adjusting spring 23, thereby realizing the elastic pushing of the front wheel frame 11 to swing backward.

[0023] Furthermore, the stubble trimming cutter disc 10 is provided with a flat disc cutter holder, on which a group of cutting blades extending radially and having adjustable extension lengths are fixedly mounted.

[0024] Furthermore, the frame 1 is provided with a fertilizing device 24 above the rotary tillage device 3, and the rear end of the frame 1 is provided with a soil covering and film covering device 25 and a drip irrigation pipe laying device 28 behind the rotary tillage device 3. In this way, through the operation of the sugarcane ridge breaking and stubble leveling machine, the agricultural management operations of stubble leveling, ridge breaking and loosening of sugarcane perennial roots, application of base fertilizer, soil covering and film covering, and laying of drip irrigation pipes can be completed at the same time.

[0025] Furthermore, the main transmission shaft 6 transmits power to the rotary tilling cutter of the rotary tilling device through the transmission box 26 and drives the rotary tilling cutter to rotate.

[0026] Furthermore, the front end of the frame 1 is provided with an upper hanging ear 1.3 extending forward at a position directly above the universal coupling 7, and the front end of the frame 1 is provided with a lower hanging ear 1.4 extending forward on both sides directly below the universal coupling 7. The upper hanging ear 1.3 and the two lower hanging ears 1.4 are arranged in a herringbone shape and are all used to be coupled with a matching tractor.

[0027] When the sugarcane ridge breaker and stubble leveler is used, the entire machine is first hooked to the rear of a matching tractor through the upper hook 1.3 and the lower hook 1.4, and the front end of the universal joint coupling 7 is connected to the PTO power output interface of the tractor. The matching tractor pulls the machine to move on the sugarcane field and provides driving power for the stubble leveler 2 and the rotary tillage device 3 of the machine.

[0028] like Figure 5-Figure 7As shown, when stubbling sugarcane ratoons, the tractor wheels 5 travel along the furrow bottom, the depth-control wheels 5 travel along the ridge top, and the contouring wheels 12 of the stubble-leveling device 2 travel along the furrow bottom and, under the push of an elastic pushing mechanism, contour the running surface. These contouring wheels 12 drive the stubble-leveling cutterhead 10 to move up and down in response to the undulations of the furrow bottom. When operating on flat ground, since the furrow has no significant undulations, the contouring wheels 12 do not move noticeably, and the stubble-leveling device 2 does not experience noticeable up-and-down movement. The cutting blades of the stubble-leveling cutterhead 10 remain on the ridge top surface or at a certain depth embedded in the soil. When operating on uphill terrain, the contouring wheels 12 remain pressed against the furrow bottom. As the terrain rises, the front wheel frame 11 rises along with the contouring wheels 12, driving the subframe 8 assembly, including the stubble-leveling cutterhead 10, upward, ensuring that the cutting blades of the stubble-leveling cutterhead 10 remain well-maintained on the ridge top surface or at a certain depth embedded in the soil. When operating on downhill terrain, the entire sub-frame 8 assembly, including the stubble cutter disc 10 and front wheel frame 11, moves downward due to its own weight until the contour wheel 12 remains pressed against the bottom of the ridge furrow. As the terrain lowers, the stubble cutter disc 10 also follows the terrain, ensuring that the cutting blades on the stubble cutter disc 10 remain well positioned on the ridge top surface or at a certain depth in the soil. Therefore, whether operating on flat, uphill, or downhill terrain, the cutting blades on the stubble cutter disc 10 remain well positioned on the ridge top surface or at a certain depth in the soil. There will be no problems with the cutting blades penetrating too deep into the soil due to uphill conditions, thereby damaging the sugarcane perennial roots, or with the cutting blades being too high off the ground due to downhill conditions, resulting in excessive sugarcane stubble.

[0029] It can be seen that the design of the stubble disc of the sugarcane ridge breaker that can float in accordance with the terrain can effectively solve the problem that the stubble disc 10 of the existing sugarcane perennial stubble equipment cannot well adaptively adjust the cutting depth when working on uphill and downhill terrain.

[0030] The above-mentioned figures are only typical embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc that can float in accordance with the terrain, characterized by: The sugarcane ridge breaking and stubble leveling machine is provided with a frame (1), a stubble leveling device (2) is provided at a lower position of the front end of the frame (1), a rotary tillage device (3) is provided on the frame (1) behind the stubble leveling device (2), a depth-limiting wheel (5) is provided on the frame (1) at a position centered on the left and right sides and located between the stubble leveling device (2) and the rotary tillage device (3) via a downwardly extending intermediate wheel frame (4), a main transmission shaft (6) is provided at a position centered on the left and right sides above the stubble leveling device (2), a universal joint (7) is connected to the front end of the main transmission shaft (6), and the universal joint coupling receives the PTO output power of the matching tractor and transmits the power to the stubble leveling device (2) and the rotary tillage device (3) via the main transmission shaft (6); The stubble-leveling device (2) is provided with a sub-frame (8) below the front end of the frame (1), and the upper end of the sub-frame (8) is slidably connected to the sliding bearing (1.1) correspondingly installed on the frame (1) through a sliding guide column (8.1), so that the sub-frame (8) can move up and down relative to the frame (1); the lower end of the middle part of the sub-frame (8) is fixedly connected to two symmetrically arranged transmission gear boxes (9) on the left and right, and the transmission gear boxes (9) are provided with an input shaft extending backward and an output shaft extending downward, and the output shafts of the two transmission gear boxes (9) are respectively connected to a stubble-leveling cutter disc (10), and the main transmission shaft (6) drives the input shafts of the two transmission gear boxes (9) to rotate simultaneously through a set of chain transmission components with an elastic tensioning structure. The auxiliary frame (8) is driven by the output shafts of the two transmission gear boxes (9) to drive the two stubble cutter discs (10) to rotate; the left and right ends of the auxiliary frame (8) are respectively provided with left and right profiling wheels (12) on the outer sides of the two stubble cutter discs (10) through front wheel frames (11) extending obliquely forward and downward, the upper ends of the front wheel frames (11) are hinged on the auxiliary frame (8), and the auxiliary frame (8) is respectively provided with elastic pushing mechanisms at the front ends of the left and right front wheel frames (11) for causing the front wheel frames (11) to swing downward, and the elastic pushing mechanisms elastically push the front wheel frames (11) so that the profiling wheels (12) are kept elastically pressed against the bottom surface of the ridge of the sugarcane field, thereby driving the stubble cutter discs (10) to achieve profiling cutting and stubble cutting of the sugarcane field.

2. The sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc capable of floating along the terrain according to claim 1 is characterized by: The chain transmission assembly comprises a driving sprocket (13) fixedly connected to the main transmission shaft (6), two driven sprockets (14) fixedly connected to the input shafts of the two transmission gear boxes (9) below the driving sprocket (13), a chain ring (15) surrounding the outer periphery of the driving sprocket (13) and the two driven sprockets (14) and forming a meshing engagement, and a guide sprocket (15) fixedly mounted on the auxiliary frame (8) and located above the two driven sprockets (14) and meshing with the chain ring (15) from the outside. 16); The elastic tensioning structure is provided with two tensioning sprockets (17) on the left and right sides respectively for engaging with the chain ring (15) from the outside of the left and right sides and tensioning the chain ring (15); the two tensioning sprockets (17) are respectively mounted on the upper ends of two left and right swing arms (18) arranged in an eight-shaped pattern; a tension spring (19) is provided between the upper ends of the two swing arms (18) for lateral elastic pulling; the lower ends of the two swing arms (18) are respectively hinged to the hinge seats (1.2) correspondingly mounted on the frame (1).

3. The sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc capable of floating along the terrain according to claim 1 is characterized by: The chain drive assembly is replaced by a belt drive assembly.

4. The sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc capable of floating along the terrain according to claim 1 is characterized by: The left and right ends of the auxiliary frame (8) are provided with mounting seats (27) that can move left and right along the auxiliary frame (8) and can be locked. The mounting seats (27) are fixed to the auxiliary frame (8) through U-shaped screws. The upper ends of the left and right front wheel frames (11) are respectively hinged to the mounting seats (27) at the left and right ends of the auxiliary frame (8). The elastic pushing mechanisms on the left and right sides are also correspondingly mounted on the left and right mounting seats (27).

5. The sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc capable of floating along the terrain according to claim 4 is characterized by: The elastic pushing mechanism is provided with a push rod (20) tilted forward, the lower end of the push rod (20) is hinged on the front wheel frame (11), the mounting seat (27) is fixedly provided with a support arm (21) extending forward above the front wheel frame (11), the front end of the support arm (21) is hinged with a sliding sleeve (22), the upper end of the push rod (20) slides through the sliding sleeve (22) and is provided with an upper nut for locking, the push rod (20) is sleeved with an adjustment spring (23) on the rod body below the sliding sleeve (22) and is provided with a lower nut to press the adjustment spring (23), thereby realizing elastic pushing to make the front wheel frame (11) swing backward.

6. The sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc capable of floating along the terrain according to claim 1 is characterized by: The stubble cutter disc (10) is provided with a planar disc cutter holder, on which a group of cutting blades extending radially and having adjustable extension lengths are fixedly mounted.

7. The sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc capable of floating along the terrain according to claim 1 is characterized by: The frame (1) is further provided with a fertilizing device (24) above the rotary tillage device (3), and the rear end of the frame (1) is further provided with a soil covering and film covering device (25) and a drip irrigation pipe laying device (28) behind the rotary tillage device (3).

8. The sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc capable of floating along the terrain according to claim 1 is characterized by: The main transmission shaft (6) transmits power to the rotary tillage cutter of the rotary tillage device (3) through the transmission box (26) and drives the rotary tillage cutter to rotate.

9. The sugarcane ridge-breaking and stubble-leveling machine with a stubble-leveling disc capable of floating along the terrain according to claim 1 is characterized by: The front end of the frame (1) is provided with an upper hanging ear (1.3) extending forward at a position directly above the universal coupling (7), and the front end of the frame (1) is provided with a lower hanging ear (1.4) extending forward at positions on the left and right sides directly below the universal coupling (7). The upper hanging ear (1.3) and the two lower hanging ears (1.4) are arranged in a herringbone shape and are all used for coupling with a matching tractor.

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