Dual-purpose double-row seeder

Abstract

The utility model relates to a dual-purpose double-row seeder which comprises a rack, a seed rope seeding mechanism and a seed box seeding mechanism, a land wheel is arranged on the front side of the rack, and a mounting seat is arranged at the bottom of the rack; the seed rope seeding mechanism comprises a seed rope seed-metering device mounted on the rack and a first ditching mechanism matched with the seed rope seed-metering device, and the first ditching mechanism is detachably and fixedly connected with the mounting seat; the seed box seeding mechanism comprises a seed box seed-metering device mounted on the rack and a second ditching mechanism matched with the seed box seed-metering device, and the second ditching mechanism is also detachably and fixedly connected with the mounting seat. The dual-purpose seeder is dual-purpose, saves cost, and is convenient to use and wider in application range by switching two seeding modes.

Description

Technical Field

[0001] The utility model relates to the technical field of seed drills, in particular to a dual-purpose double-row seed drill. Background Art

[0002] In existing agricultural sowing technologies, traditional sowing methods often rely on manual seed sowing, which is inefficient and unevenly distributed, affecting the growth and yield of crops. Currently, seed box seeders or seed rope seeders are commonly used for mechanical sowing, which are more efficient and faster than traditional manual sowing methods.

[0003] A seed box seeder places seeds directly in a seed box and rotates a circular disc in the box to move a certain number of seeds. When the seeds reach the lowest point, they fall out and, under the influence of gravity, slide into the seeding tube and are planted in the soil. While suitable for rapid sowing of small seeds and easy to use, it is difficult to control the quantity sown each time. A rope seeder, on the other hand, secures seeds to degradable ropes beforehand and then uses the seeder to bury the ropes in the soil, achieving precise seed sowing. This method is suitable for sowing crops such as vegetables and medicinal herbs. Its advantage lies in its ability to precisely control plant spacing and reduce seed waste. However, compared to a seed box seeder, it requires more preparatory work and is more expensive.

[0004] Existing seed box and rope seeders offer a single sowing method and low efficiency. Agricultural sowing operations often require different sowing machines depending on the specific sowing scenario, seed type, or sowing technique. This is extremely inconvenient. Furthermore, the need to prepare different sowing machines for each operation increases operating costs. Utility Model Content

[0005] In response to the deficiencies in the prior art, the utility model provides a double-row seeder that can be used for both rope sowing and box sowing. Different sowing methods can be switched according to needs. The utility model is easy to use, more practical, improves operating efficiency, reduces planting costs, and is suitable for promotion.

[0006] The utility model is realized through the following technical scheme: a dual-purpose double-row seeder, comprising a frame, a ground wheel being provided on the front side of the frame, a seed rope sowing mechanism and a seed box sowing mechanism, and a mounting seat being provided at the bottom of the frame; the seed rope sowing mechanism comprises a seed rope seeding device mounted on the frame and a first furrowing mechanism cooperating with the seed rope seeding device, and the first furrowing mechanism is detachably fixed to the mounting seat; the seed box sowing mechanism comprises a seed box seeding device mounted on the frame and a second furrowing mechanism cooperating with the seed box seeding device, and the second furrowing mechanism is also detachably fixed to the mounting seat.

[0007] In this solution, the first furrowing mechanism and the second furrowing mechanism are detachably connected to the mounting seat, and a seed rope seeding device or a seed box seeding device can be selected for sowing according to actual working conditions. When the seed rope seeding device is used, the first furrowing mechanism is installed on the mounting seat, and the seed rope sowing is carried out through the seed rope guide tube of the first furrowing mechanism. When the seed box seeding device needs to be used, the first furrowing mechanism is removed and the second furrowing mechanism is installed, and the seed box sowing is carried out through the seed discharge tube of the second furrowing mechanism, thereby realizing dual-purpose of one machine and saving costs. By switching between the two sowing methods, it is easy to use and has a wider range of applications.

[0008] As an optimization, the seed rope metering device includes a seed rope disc and a seed disc shaft. One end of the seed disc shaft is fixedly connected to the frame, and the seed rope disc is rotatably mounted on the seed disc shaft. A seed disc spring mounted on the seed disc shaft is provided between the frame and the seed rope disc. This optimization solution achieves seed rope metering through the rotation of the seed rope disc. The seed disc spring can buffer the impact force of the seed rope disc during rotation, protecting the seed rope disc and seed disc shaft from damage, while also making the seed rope disc easier to rotate.

[0009] As an optimization, the first furrowing mechanism includes a seed rope conduit corresponding to the seed rope reel and a first mounting plate. The seed rope conduit is affixed to the front end with a first furrow opener, the seed rope conduit is affixed to the first mounting plate, and the first mounting plate is detachably affixed to the mounting seat. In this optimization solution, the first furrowing mechanism and the mounting seat are detachably affixed via the first mounting plate. After the first furrow opener opens the furrow, the seed rope is guided by the seed rope conduit so that the seed rope is planted within the furrow, thereby achieving the seed rope sowing function.

[0010] As an optimization, a soil covering plate extending to the rear of the seed rope conduit is fixedly connected to the seed rope conduit. In this optimization solution, after the seed rope is put into the ditch, the soil is covered on the seed rope by the soil covering plate.

[0011] As an optimization, the seed box metering device includes a socket wheel drive shaft extending in the width direction, and a seeding device mounted on the socket wheel drive shaft. The seeding device is fixed to the frame, and the socket wheel drive shaft is rotatably connected to the seeding device. In this optimization solution, the rotation of the socket wheel drive shaft discharges the seed particles in the seeding device, thereby achieving seeding from the seed box.

[0012] As an optimization, a rear wheel is provided on the rear side of the frame, and the eyelet wheel drive shaft is in driving connection with the wheel shaft of the rear wheel. In this optimization solution, the eyelet wheel drive shaft can be driven by the rotation of the rear wheel to sow the seed box, and the eyelet wheel drive shaft does not require additional power to drive, which is convenient to use.

[0013] As an optimization, the second furrowing mechanism includes a seeding tube corresponding to the seeding device and a second mounting plate. The upper end of the seeding tube is plugged into the seeding tube of the seeding device, and a second furrow opener is fixedly connected to the lower end of the seeding tube. The second mounting plate is fixedly connected to the second furrow opener, and the second mounting plate is detachably fixed to the mounting seat. In this optimization solution, the seeding tube and the seeding tube are plugged together for easy connection. The seeds are discharged from the seeding box seeding device, and the second furrow opener opens a furrow, allowing the seeds to fall into the furrow, thereby realizing the seeding function of the seed box.

[0014] As an optimization, the mounting base includes a fixed sleeve fixed to the frame, the first or second mounting plate being inserted into the fixed sleeve, and a fastening bolt threaded onto the fixed sleeve for tightening the first or second mounting plate. This optimization solution utilizes fastening bolts to tighten the first or second mounting plate, facilitating assembly and disassembly. Furthermore, depending on the tightening position, the trenching depth of the first or second trench opener can be fine-tuned.

[0015] As an optimization, a stubble remover is installed at the front of the frame. It is located ahead of the ground wheels. The front end of the stubble remover is tapered and its upper end is screwed to the frame via fixing bolts. This optimized stubble remover removes weeds, stubble, and other obstacles from the ground, creating a smoother soil environment for sowing. The angle of the stubble remover can be adjusted by loosening or tightening the fixing bolts, making it easy to use.

[0016] As an optimization, a rope cutting mechanism is provided at the rear end of the frame. The mechanism comprises a sliding seat that is slidably connected to the frame. A cutting blade is fixedly attached to the bottom of the sliding seat. The cutting blade is located directly behind the first trenching mechanism. A return spring is provided between the sliding seat and the frame to drive the sliding seat upward and return to its original position. This solution facilitates use by allowing the cutting blade to cut the seed rope by sliding the sliding seat downward. The sliding seat is then driven upward by the return spring to automatically return to its original position, facilitating the next cut.

[0017] The beneficial effects of the utility model are: it realizes the switching use of the two functions of seed rope seeding and seed box seeding, meets more usage requirements, and can simultaneously carry out land preparation, furrowing, sowing, soil leveling, and rope cutting processes while sowing, realizing multiple uses of one machine, greatly improving production efficiency, saving manpower and material resources, and high efficiency during sowing, low labor intensity, high reliability, strong practicality, and more convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a left side view of the seed rope sowing mechanism of the utility model;

[0019] Figure 2 This is a right side view of the seed rope sowing mechanism of the utility model;

[0020] Figure 3This is a rear view of the seed rope sowing mechanism used in the present invention;

[0021] Figure 4 A three-dimensional diagram of the seed rope sowing mechanism used in this utility model Figure 1 ;

[0022] Figure 5 A three-dimensional diagram of the seed rope sowing mechanism used in this utility model Figure 2 ;

[0023] Figure 6 for Figure 5 A magnified view of part A;

[0024] Figure 7 Schematic diagram of the mounting base structure;

[0025] Figure 8 Schematic diagram of the structure of the first trenching mechanism;

[0026] Figure 9 This is a schematic diagram of the installation of the first trenching mechanism;

[0027] Figure 10 Schematic diagram of the installation of the first ditching mechanism on the frame;

[0028] Figure 11 This is a left view of the seed box sowing mechanism used in the utility model;

[0029] Figure 12 This is a three-dimensional schematic diagram of a seed box sowing mechanism used in the present invention;

[0030] Figure 13 It is a three-dimensional schematic diagram of the seed box sowing mechanism;

[0031] Figure 14 It is a side view of the seed box sowing mechanism;

[0032] Figure 15 This is a schematic diagram of the installation of the second ditching mechanism on the frame;

[0033] Figure 16 Schematic diagram of the seeding device structure;

[0034] As shown in the figure:

[0035] 1. Frame, 2. Ground wheel, 21. Drive motor, 22. Front wheel axle, 23. First chain, 3. Mounting seat, 31. Fixed sleeve, 32. Articulated shaft, 33. Fixed plate, 34. Threaded hole, 4. Seed rope sowing mechanism, 41. Seed rope metering device, 411. Seed rope disc, 412. Seed disc shaft, 413. Seed disc spring, 42. First furrowing mechanism, 421. Seed rope guide tube, 422. First mounting plate, 423. First furrow opener, 424. Covering plate, 5. Seed box sowing mechanism, 5 1. Seed box seeding device, 511. Eyelet wheel drive shaft, 512. Seeding device, 5121. Seed box, 5122. Seed cleaning plate, 5123. Eyelet wheel, 5124. Seed dropping tube, 52. Second furrowing mechanism, 521. Seed discharge tube, 522. Second mounting plate, 523. Second furrow opener, 6. Rear wheel, 61. Rear wheel axle, 62. Second chain, 7. Rope cutting mechanism, 71. Sliding seat, 72. Cutter, 73. Return spring, 74. Pedal, 75. Fixed rod, 76. Sleeve, 11. Stubble remover, 11. Fixing bolt, 12. Handle. DETAILED DESCRIPTION

[0036] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0037] like Figures 1 to 16 As shown, a dual-purpose double-row seed drill includes a frame 1, a seed rope seeding mechanism 4 and a seed box seeding mechanism 5. The front side of the frame 1 is equipped with a ground wheel 2, the rear end of the frame 1 is fixed with a handle 12, and the bottom of the frame 1 is provided with a mounting base 3. Figure 2 、 5 As shown, in this embodiment, two ground wheels 2 are provided on the front side of the frame 1 along the width direction, and the two ground wheels 2 are fixed on a front wheel axle 22, and the front wheel axle 22 is rotatably connected to the frame 1. A driving motor 21 is installed on the frame 1, and the output shaft of the driving motor 21 is fixedly connected to the first driving wheel, and one end of the front wheel axle 22 is fixedly connected to the first driven wheel, and the first driving wheel is connected to the first driven wheel through a first chain 23, so that the two ground wheels 2 are driven to roll by the driving motor 21 to realize the forward movement of the seed drill.

[0038] The seed rope sowing mechanism 4 includes a seed rope seed meter 41 installed on the frame 1 and a first furrowing mechanism 42 coordinated with the seed rope seed meter. The first furrowing mechanism 42 is detachably fixed to the mounting seat 3 .

[0039] like Figure 1 As shown, the seeding rope seeding device 41 includes a seeding rope disc 411 and a seeding disc shaft 412. One end of the seeding disc shaft 412 is fixed to the frame 1. The seeding rope disc 411 is rotatably mounted on the seeding disc shaft 412. A seeding disc spring 413 mounted on the seeding disc shaft 412 is provided between the frame 1 and the seeding rope disc 411. Figures 8-10As shown, the first trenching mechanism 42 includes a seed rope conduit 421 corresponding to the seed rope reel 411 and a first mounting plate 422. The seed rope conduit 421 is a 90-degree curved pipe. The vertical extension of the seed rope conduit 421 passes through the first mounting plate 422 and is fixed to the first mounting plate. The first mounting plate 422 is removably fixed to the mounting base 3. A first trenching tool 423 is fixed to the front side of the seed rope conduit 421. The first trenching tool 423 is a 90-degree curved plate fixed to the bend of the 90-degree curved pipe. To facilitate covering the buried seed rope, a covering plate 424 is fixed to the seed rope conduit 421 and extends to the rear of the seed rope conduit.

[0040] like Figure 4 As shown, in this embodiment, two seed rope sowing mechanisms 4 are provided on the frame 1, and the seed rope seeding devices 41 of the two seed rope sowing mechanisms are arranged side by side along the width direction of the frame 1. Two mounting seats 3 are provided at the bottom of the frame 1, and the first furrowing mechanisms 42 of the two seed rope sowing mechanisms 4 can be detachably mounted on the two mounting seats 3 respectively.

[0041] The seed box sowing mechanism 5 includes a seed box seed meter 51 installed on the frame 1 and a second furrowing mechanism 52 coordinated with the seed box seed meter. The second furrowing mechanism 52 is also detachably fixed to the mounting seat 3 .

[0042] like Figure 11 、 13 As shown, the seed box seed metering device 51 includes a socket wheel drive shaft 511 extending along the width of the frame 1, and a seeding device 512 mounted on the socket wheel drive shaft 511. The seeding device 512 is fixedly connected to the frame 1, and the socket wheel drive shaft 511 is rotationally connected to the seeding device 512. A rear wheel 6 is provided on the rear side of the frame 1, and the socket wheel drive shaft 511 is drivingly connected to the rear wheel axle 61 of the rear wheel 6. In this embodiment, a second driving wheel is fixedly connected to the rear wheel axle 61, and a second driven wheel is fixedly connected to the socket wheel drive shaft 511. The second driving wheel is transmission-connected to the second driven wheel via a second chain 62. Therefore, when the seeder moves forward, the rotation of the rear wheel 6 drives the rotation of the socket wheel drive shaft 511.

[0043] like Figure 14 、 15 As shown, the second furrowing mechanism 52 includes a seeding tube 521 and a second mounting plate 522 corresponding to the seeding device 512. The upper end of the seeding tube 521 is plugged into the seed dropping tube 5124 of the seeding device 512. The lower end of the seeding tube 521 is fixedly connected to a second furrow opener 523. The second mounting plate 522 is fixedly connected to the second furrow opener 523. The second mounting plate 522 is detachably fixed to the mounting seat 3.

[0044] like Figure 12As shown, in this embodiment, two seeding devices 512 are installed on the eyelet wheel transmission shaft 511, the number of the second opening mechanism 52 is two, and the two second furrowing mechanisms 52 are detachably installed on the two mounting seats 3. Figure 16 As shown, the seeding device 512 includes a seed box 5121 rotatably connected to the socket wheel transmission shaft 511, the seed box 5121 and the frame 1 are fixedly connected, the seed drop tube 5124 is located at the bottom of the seed box 5121, a socket wheel 5123 is provided in the seed box 5121, the socket wheel 5123 is fixedly mounted on the socket wheel transmission shaft 511, a seed cleaning plate 5122 is fixed in the seed box 5121, the seed cleaning plate 5122 is located on one side of the socket wheel 5123, and the side end of the seed cleaning plate is in contact with the outer wall of the socket wheel, and the socket wheel 5123 is driven to rotate by the socket wheel transmission shaft 511 to realize seeding.

[0045] like Figure 7 As shown, the mounting base 3 includes a fixed sleeve 31 fixed to the frame 1. The first mounting plate 422 or the second mounting plate 522 is inserted into the fixed sleeve 31. The fixed sleeve 31 is threaded with a fastening bolt (not shown) that tightens the first mounting plate 422 or the second mounting plate 522. Specifically, the fixed sleeve 31 is a square tube, hinged to the frame 1 via a hinge axis 32, and a fixed plate 33 is fixed to the rear side of the fixed sleeve 31. The fixed plate 33 can be connected to the frame 1 via bolts (not shown). In this way, when the fixed plate 33 is loosened from the frame 1, the fixed sleeve 31 can rotate a certain angle around the hinge axis 32, thereby facilitating the insertion of the first mounting plate 422 or the second mounting plate 522. A threaded hole 34 for screwing a fastening bolt is provided on the front side wall of the fixing sleeve 31. The first mounting plate 422 or the second mounting plate 522 is tightened and fixed by tightening the fastening bolt. After the first mounting plate 422 or the second mounting plate 522 is fixed, the fixing plate 33 and the frame 1 are screwed and fixed, thereby realizing the installation and fixation of the first ditching mechanism or the second ditching mechanism, and making replacement and use more convenient.

[0046] like Figure 5 、 6 As shown, a stubble remover 11 is provided at the front end of the frame 1. The stubble remover 11 is located in front of the ground wheel 2. The front end of the stubble remover 11 is conical. The upper end of the stubble remover 11 is screwed to the frame 1 through a fixing bolt 111. The bottom of the stubble remover is in contact with the ground, thereby removing weeds, stubble and other obstacles on the surface, creating a flatter soil environment for sowing.

[0047] like Figure 2 、 3As shown, the rear end of the frame 1 is provided with a rope cutting mechanism 7, which includes a sliding seat 71 that is slidably connected to the frame 1 in an upward and downward manner. A cutter 72 is fixedly connected to the bottom of the sliding seat 71, and the cutter 72 is located behind the first ditching mechanism 42. A return spring 73 is provided between the sliding seat 71 and the frame 1 to drive the sliding seat to slide upward and reset. In this embodiment, a vertically extending fixed rod 75 is fixedly connected to the rear end of the frame 1. A sliding sleeve 76 that adapts to the fixed rod 75 is fixedly connected to the sliding seat 71. The sliding seat 71 slides up and down along the fixed rod 75 via the sliding sleeve 76. One end of the return spring 73 is fixedly connected to the upper end of the fixed rod 75, and the other end of the return spring 73 is fixedly connected to the sliding sleeve 76, thereby driving the sliding sleeve 76 to slide upward and reset. Two cutters 72 are fixed to the bottom of the sliding seat 71. The two cutters 72 correspond to the two first ditching mechanisms 42 respectively. A pedal 74 is also fixed to the sliding seat 71. People step on the pedal 74 to drive the sliding seat 71 to slide downward, so that the cutter 72 cuts the seed rope, which is more convenient to use.

[0048] Working principle: When sowing with the seed rope sowing mechanism 4, Figure 1 As shown, the first mounting plate 422 of the first trenching mechanism 42 is inserted into the fixed sleeve 31 of the corresponding mounting seat 3, and the fastening bolts are tightened to fix the first trenching mechanism. The seed rope on the seed rope disc 411 of the seed rope metering device 41 is introduced through the rope inlet of the seed rope guide 421, guided out through the rope outlet and buried in the soil. The drive motor 21 drives the ground wheel 2 to rotate, causing the seeder to move forward for sowing. When a section of sowing is completed, the operator steps on the pedal 74 of the rope cutting mechanism 7, thereby driving the sliding seat 71 to slide downward, causing the cutter 72 to cut the seed rope. The operator releases the pedal 74, and the return spring 73 drives the sliding seat 71 to slide upward and return to its original position, making it easy to use.

[0049] When using the seed box sowing mechanism to sow 5, Figure 11 As shown, first loosen the fastening bolts of the mounting seat, remove the first furrowing mechanism 42, and then insert the second mounting plate 522 of the second furrowing mechanism 52 into the fixed sleeve 31 of the mounting seat 3, and connect the upper end of the seed tube 521 with the seed drop tube 5124 of the seeding device 512. Finally, fix the second furrowing mechanism 52 by fastening the bolts, and then put seeds into the seed box 5121 of the seeding device 512. When the seeder moves forward, the rotation of the rear wheel 6 drives the rotation of the socket wheel drive shaft 511 to sow.

[0050] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A dual-purpose double-row seeder, comprising a frame (1), a ground wheel (2) mounted on the front side of the frame, characterized in that: It also includes a seed rope sowing mechanism (4) and a seed box sowing mechanism (5), and a mounting seat (3) is provided at the bottom of the frame (1); The seed rope sowing mechanism (4) comprises a seed rope seed meter (41) mounted on the frame (1) and a first furrowing mechanism (42) cooperating with the seed rope seed meter, wherein the first furrowing mechanism (42) is detachably fixed to the mounting seat (3); The seed box sowing mechanism (5) comprises a seed box seed meter (51) mounted on the frame (1) and a second furrowing mechanism (52) cooperating with the seed box seed meter. The second furrowing mechanism (52) is also detachably fixed to the mounting seat (3).

2. A dual-purpose double-row seeder according to claim 1, characterized in that: The seed rope seeding device (41) comprises a seed rope disc (411) and a seed disc shaft (412), one end of the seed disc shaft (412) is fixedly connected to the frame (1), the seed rope disc (411) is rotatably mounted on the seed disc shaft (412), and a seed disc spring (413) mounted on the seed disc shaft is provided between the frame and the seed rope disc.

3. A dual-purpose double-row seeder according to claim 2, characterized in that: The first furrowing mechanism (42) comprises a seed rope conduit (421) corresponding to the seed rope drum (411) and a first mounting plate (422); a first furrowing device (423) is fixedly connected to the front side of the seed rope conduit (421); the seed rope conduit (421) is fixedly connected to the first mounting plate (422); and the first mounting plate (422) is detachably fixedly connected to the mounting seat (3).

4. A dual-purpose double-row seeder according to claim 3, characterized in that: A soil covering plate (424) extending to the rear of the seed rope conduit (421) is fixedly connected to the seed rope conduit.

5. The dual-purpose double-row seeder according to claim 3, characterized in that: The seed box seeding device (51) comprises a socket wheel transmission shaft (511) extending in the width direction of the frame, and a seeding device (512) mounted on the socket wheel transmission shaft, wherein the seeding device (512) is fixedly connected to the frame (1), and the socket wheel transmission shaft (511) is rotatably connected to the seeding device (512).

6. A dual-purpose double-row seeder according to claim 5, characterized in that: A rear wheel (6) is provided on the rear side of the frame (1), and the socket wheel transmission shaft (511) is in transmission connection with the rear wheel axle (61) of the rear wheel.

7. The dual-purpose double-row seeder according to claim 5, characterized in that: The second furrowing mechanism (52) comprises a seeding tube (521) corresponding to the seeding device (512) and a second mounting plate (522); the upper end of the seeding tube (521) is plugged into a seeding tube (5124) of the seeding device; the lower end of the seeding tube (521) is fixedly connected to a second furrow opener (523); the second mounting plate (522) is fixedly connected to the second furrow opener (523); and the second mounting plate (522) is detachably fixedly connected to the mounting seat (3).

8. The dual-purpose double-row seeder according to claim 7, characterized in that: The mounting seat (3) includes a fixed sleeve (31) fixed on the frame (1), the first mounting plate (422) or the second mounting plate (522) is inserted into the fixed sleeve (31), and a fastening bolt for tightening the first mounting plate or the second mounting plate is screwed onto the fixed sleeve (31).

9. The dual-purpose double-row seeder according to claim 1, characterized in that: A stubble remover (11) is provided at the front end of the frame (1). The stubble remover is located in front of the ground wheel (2). The front end of the stubble remover is conical, and the upper end of the stubble remover is screwed and fixed to the frame (1) via a fixing bolt (111).

10. The dual-purpose double-row seeder according to claim 1, characterized in that: A rope cutting mechanism (7) is provided at the rear end of the frame (1), the rope cutting mechanism comprising a sliding seat (71) connected to the frame (1) in an upward and downward sliding manner, a cutter (72) being fixedly connected to the bottom of the sliding seat (71), the cutter being located behind the first ditching mechanism (42), and a return spring (73) for driving the sliding seat (71) to slide upward and return to its original position is provided between the sliding seat (71) and the frame (1).

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