A kind of integrated machine for trenching and landfilling farmland irrigation pipelines

Abstract

The present invention discloses an integrated machine for trenching and landfilling farm irrigation pipelines. The present invention relates to the technical field of agricultural machinery, and solves the problem that the current laying method of irrigation and drainage pipelines is not applicable to the integrated laying of farm irrigation and drainage pipelines. The integrated machine includes a suspension frame, a frame, a trenching device, a pipeline laying device, and a soil covering device; the trenching device includes a driving sprocket, a driven sprocket, a tensioning wheel, a chain, a chain cutter, and a spiral soil discharger; the pipeline laying device includes a pipeline placement rack and a pipeline fixing plate; the trenching device, the pipeline laying device, and the soil covering device are all installed on the frame, the frame is connected to the suspension frame through a hydraulic cylinder, and the soil covering device uses a separate V-shaped shovel instead of the V-shaped shovel controlled by a hydraulic rod in the past. The present invention can realize the simultaneous carrying out of the three processes of trenching, pipe laying, and backfilling in the laying of farm irrigation and drainage pipelines, and has the characteristics of simple operation, strong mobility, labor saving, and cost saving, and can effectively reduce the repeated rolling of the working machine on the farmland soil.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, and in particular to an integrated machine for trenching and landfilling farmland irrigation pipelines. Background Art

[0002] Agricultural irrigation and drainage technology is an important part of agricultural production and construction. The level of agricultural irrigation and drainage technology will directly affect the use of water resources. The most basic and commonly used equipment in the irrigation and drainage process is the irrigation and drainage pipe. At present, irrigation and drainage pipes in most areas are still laid manually. The manual operation steps are cumbersome, time-consuming and labor-intensive. Even if machinery is used, it is divided into three processes: trenching, laying pipes, and landfilling and covering. In the landfilling and covering operation, most of the front splints are installed at the front end of the tractor for secondary backfilling. The above two methods consume a lot of manpower and power machinery fuel. The excavated soil trenches are not standardized and of poor quality, and the secondary backfilling operation aggravates the compaction of the soil by the operating machinery.

[0003] For example, the prior art CN219653781U discloses an integrated trenching, pipe laying and backfilling machine, which can simultaneously perform trenching, pipe laying and backfilling. Its pipe support mechanism and backfilling mechanism require lifting mechanisms to work, which increases the overall weight and control difficulty of the device; the prior art CN114623285A discloses a small-caliber hose pipe laying machine, which uses a more traditional plowshare mechanism to trench, which is inefficient, and the plow body does not have an obvious leveling effect on both sides of the ditch during trenching; Wang Huaxiang published a study on the "1KP-250" trenching and pipe laying machine in "Agricultural Machinery". The pipe box of this device is placed at the rear end of the device, which is suitable for concealed pipe drainage, and there is no backfilling and covering mechanism, so it cannot perform covering operations. The above devices are not suitable for the integrated laying of farmland irrigation and drainage pipes. Therefore, it is necessary to propose an integrated trenching and landfilling machine for farmland irrigation pipes to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide an integrated machine for trenching and landfilling farmland irrigation pipes, so as to solve the problem that the current irrigation and drainage pipe laying method is not suitable for the integrated laying of farmland irrigation and drainage pipes.

[0005] The present invention provides a farmland irrigation pipeline trenching and landfilling integrated machine, comprising: a trenching device, a hanging frame, a frame, a soil covering device and a pipeline laying device;

[0006] The ditching device includes: a driving sprocket, a driving sprocket shaft, a vertical pedestal bearing, a chain, a ditching knife, a driven sprocket, a first pedestal bearing, a driven sprocket shaft, a tensioning wheel shaft, a tensioning wheel, a diamond pedestal bearing, a spiral soil discharger, a second pedestal bearing, a soil scraping plate and a soil scraping plate fixing mechanism; the driving sprocket is penetrated by the driving sprocket shaft, one end is connected to the second pedestal bearing, the second pedestal bearing is fixed on the suspension bracket, and the other end passes through the vertical pedestal bearing and is connected to the coupling; the vertical pedestal bearing is connected to the extension beam of the suspension bracket by a pin shaft; the tensioning wheel shaft passes through the tensioning wheel and the diamond pedestal bearing, both ends of the tensioning wheel shaft are connected to the spiral soil discharger, the driven sprocket shaft passes through the driven sprocket and the first pedestal bearing, the diamond pedestal bearing and the first pedestal bearing are fixed on the steel plate at the sprocket placement of the machine frame, and the ditching knife is fixed on the outer link plate of the chain; the lower suspension point of the soil scraping plate is connected to the extension beam of the machine frame, the upper suspension point is connected to the soil scraping plate fixing mechanism, and the soil scraping plate fixing mechanism is fixed to the extension beam of the machine frame; the soil covering device includes a V-shaped shovel, the upper suspension point of the V-shaped shovel arm is connected to the convex plate of the cross beam of the machine frame, and the pipeline laying device includes a pipeline fixing plate and a pipeline laying plate, the pipeline fixing plate is fixed on the extension beam of the machine frame, and the pipeline laying plate is connected to the soil scraping plate.

[0007] Further, the ditching device further includes: a third bolt, a fourth bolt, a fifth bolt, a first pin shaft, a first punching pin, a first bolt, a first spring, a connecting pin and a first nut; the lower suspension point of the soil scraping plate is connected to the extension beam of the machine frame through the first pin shaft, the upper suspension point is connected to the first bolt through the first punching pin, and the first bolt is connected to the soil scraping plate fixing mechanism; the first bolt is connected to the first nut, and the first spring is concentrically placed on the first bolt; the soil scraping plate fixing mechanism is fixed to the extension beam of the machine frame through the connecting pin; the second pedestal bearing is fixed on the suspension bracket through the fifth bolt, the diamond pedestal bearing and the first pedestal bearing are respectively fixed on the steel plate at the sprocket placement of the machine frame through the fourth bolt and the third bolt, and the ditching knife is fixed on the outer link plate of the chain through bolts.

[0008] Further, the corresponding suspension positions of the suspension bracket and the machine frame are connected by a hydraulic rod, the lower end of the hydraulic rod is fixed to the machine frame through a second pin shaft, the upper end is fixed to the suspension bracket through a third pin shaft, and the extension arm of the main beam of the machine frame is connected to the side plate of the suspension bracket through a fourth pin shaft.

[0009] Further, the lower suspension point on the V-shaped shovel suspension arm is fixed to the extension arm of the cross beam of the machine frame through a fifth pin shaft, and the unfolding radian of the V-shaped shovel is 130°.

[0010] Further, the upper suspension point of the V-shaped shovel arm is connected to the convex plate of the cross beam of the machine frame through a second bolt and a second punching pin; the second spring is concentrically connected to the connecting second bolt, and the second bolt is connected to the second nut.

[0011] Furthermore, the pipeline laying device also includes: a pipeline placement optical axis, a pipeline baffle and a third seat bearing; both ends of the pipeline placement optical axis are connected to the third seat bearing, the third seat bearing is fixed to the outer end of the pipeline baffle, and the pipeline baffle is fixed to the upper beam of the suspension frame.

[0012] Furthermore, the pipeline laying device also includes: a sixth bolt, a third nut and a fixing bolt; the third seat bearing is fixed to the outer end of the pipeline baffle by the sixth bolt and the third nut, and the pipeline baffle is fixed to the upper beam of the suspension frame by the fixing bolt.

[0013] Furthermore, the distance between the rear end of the pipe laying plate and the rear end of the V-shaped shovel at the angle is 30 cm; the bottom end of the scraper plate is parallel to the bottom end of the driven sprocket and is on the same horizontal plane, the trenching depth does not exceed 50 cm, and the trenching width does not exceed 20 cm.

[0014] The invention has the following beneficial effects: the invention provides an integrated machine for trenching and landfilling farmland irrigation pipelines, wherein the bottom of the V-shaped shovel is in horizontal contact with the ground and automatically rises and falls under the action of a spring, and the unfolding arc of the V-shaped shovel is fixed at 130 degrees, replacing the previous control of the lifting and opening angle of the V-shaped shovel by a hydraulic mechanism, simplifying the operation process of the device and improving maneuverability; the V-shaped shovel is installed at the end of the device, and performs soil backfilling operations as the working tool moves forward, so that the entire device completes trenching, laying pipelines, and landfilling and covering operations at one time, avoiding secondary work of the tool and reducing the compaction of the soil by the working tool; the trenching device of the integrated machine adopts a chain type trenching device, replacing the plowshare type trenching device, so that the trench bottom and trench wall are neat and standardized; the trenching device placement position of the frame adopts steel plate welding, replacing the previous steel pipe structure, reducing the weight of the tool; the pipeline fixing device can be adjusted and replaced autonomously according to the pipe diameter, broadening the scope of application and greatly reducing the consumption of manual laying of pipelines; the whole machine is lightweight, improving the working efficiency of the tool and saving fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of a farmland irrigation pipeline trenching and landfilling integrated machine of the present invention;

[0017] Figure 2 It is a single-side schematic diagram of a farmland irrigation pipeline trenching and landfilling integrated machine of the present invention;

[0018] Figure 3It is a schematic structural diagram of the soil covering device, the soil scraping plate and the frame;

[0019] Figure 4 It is a schematic structural diagram of the pipe placement mechanism in the pipe laying device;

[0020] Figure 5 It is a schematic structural diagram of the soil scraping plate;

[0021] Figure 6 It is a partial enlarged schematic diagram of a farmland irrigation pipeline trenching and landfilling integrated machine of the present invention.

[0022] Illustration: 1 - Ditching device; 2 - Suspension frame; 3 - Frame; 4 - Soil covering device; 5 - Pipe laying device; 11 - Driving sprocket; 12 - Driving sprocket shaft; 13 - Vertical block bearing; 14 - Chain; 15 - Ditching knife; 16 - Driven sprocket; 17 - First block bearing; 18 - Third bolt; 19 - Driven sprocket shaft; 41 - V-shaped shovel; 42 - Convex plate; 43 - Fifth pin shaft; 44 - Second punching pin; 45 - Second nut; 46 - Second bolt; 47 - Second spring; 51 - Pipe placement optical axis; 52 - Pipe baffle; 53 - Third block bearing; 54 - Sixth bolt; 55 - Third nut; 56 - Fixed bolt; 57 - Pipe fixing plate; 58 - Pipe laying plate; 110 - Tensioning wheel shaft; 111 - Tensioning wheel; 112 - Fourth bolt; 113 - Diamond block bearing; 114 - Spiral soil discharger; 115 - Coupling; 116 - Second pin shaft; 117 - Second block bearing; 118 - Fifth bolt; 119 - Soil scraping plate; 120 - First pin shaft; 121 - First punching pin; 122 - First bolt; 123 - First spring; 124 - Soil scraping plate fixing mechanism; 125 - Connecting pin; 126 - First nut; 127 - Fourth pin shaft; 128 - Hydraulic rod; 129 - Third pin shaft. Detailed implementation manners

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments. It should be pointed out that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0024] Please refer to Figures 1 to 6 , the embodiment of the present invention provides a farmland irrigation pipeline trenching and landfilling integrated machine, including: a ditching device 1, a suspension frame 2, a frame 3, a soil covering device 4 and a pipe laying device 5;

[0025] The ditching device 1 includes: a driving sprocket 11, a driving sprocket shaft 12, a vertical pedestal bearing 13, a chain 14, a ditching knife 15, a driven sprocket 16, a first pedestal bearing 17, a driven sprocket shaft 19, a tensioning wheel shaft 110, a tensioning wheel 111, a diamond pedestal bearing 113, a spiral soil discharger 114, a second pedestal bearing 117, a soil scraping plate 119 and a soil scraping plate fixing mechanism 124; the driving sprocket 11 is penetrated by the driving sprocket shaft 12, one end is connected to the second pedestal bearing 117, the second pedestal bearing 117 is fixed on the suspension bracket 2, and the other end passes through the vertical pedestal bearing 13 and is connected to a coupling 115; the vertical pedestal bearing 13 is pin-connected to the extension beam of the suspension bracket 2; the tensioning wheel shaft 110 passes through the tensioning wheel 111 and the diamond pedestal bearing 113, and both ends of the tensioning wheel shaft 110 are connected to the spiral soil discharger 114, the driven sprocket shaft 19 passes through the driven sprocket 16 and the first pedestal bearing 17, the diamond pedestal bearing 113 and the first pedestal bearing 17 are fixed on the steel plate at the sprocket placement of the machine frame 3, and the ditching knife 15 is fixed on the outer link plate of the chain 14; the lower suspension point of the soil scraping plate 119 is connected to the extension beam of the machine frame 3, the upper suspension point is connected to the soil scraping plate fixing mechanism 124, and the soil scraping plate fixing mechanism 124 is fixed to the extension beam of the machine frame 3; the soil covering device 4 includes a V-shaped shovel 41, the upper suspension point of the shovel arm of the V-shaped shovel 41 is connected to the convex plate 42 of the cross beam of the machine frame, and the pipeline laying device 5 includes a pipeline fixing plate 57 and a pipeline laying plate 58, the pipeline fixing plate 57 is fixed on the extension beam of the machine frame 3, and the pipeline laying plate 58 is connected to the soil scraping plate 119. The pipeline fixing plate 57 in the pipeline laying device 5 can be adjusted in position as needed, and the pipeline laying plate 58 can be autonomously replaced according to the size of the pipe diameter, enabling the machine to adapt to pipes of more sizes, expanding the scope of application and increasing the usage ways.

[0026] In this embodiment, the ditching device 1 further includes: a third bolt 18, a fourth bolt 112, a fifth bolt 118, a first pin 120, a first punching pin 121, a first bolt 122, a first spring 123, a connecting pin 125 and a first nut 126; the lower suspension point of the soil scraping plate 119 is connected to the extension beam of the machine frame 3 through the first pin 120, the upper suspension point is connected to the first bolt 122 through the first punching pin 121, and the first bolt 122 is connected to the soil scraping plate fixing mechanism 124; the first bolt 122 is connected to the first nut 126, and the highly elastic and high-strength first spring 123 is concentrically placed on the first bolt 122; the soil scraping plate fixing mechanism 124 is fixed to the extension beam of the machine frame 3 through the connecting pin 125; the second pedestal bearing 117 is fixed on the suspension bracket 2 through the fifth bolt 118, and the diamond pedestal bearing 113 and the first pedestal bearing 17 are respectively fixed on the steel plate at the sprocket placement of the machine frame 3 through the fourth bolt 112 and the third bolt 18, and the ditching knife 15 is fixed on the outer link plate of the chain 14 through bolts.

[0027] In this embodiment, the corresponding suspension positions of the suspension frame 2 and the frame 3 are connected by a hydraulic rod 128. The lower end of the hydraulic rod 128 is fixed to the frame 3 through a second pin shaft 116, and the upper end is fixed to the suspension frame 2 through a third pin shaft 129. The extension arm of the main beam of the frame 3 is connected to the side plate of the suspension frame 2 through a fourth pin shaft 127.

[0028] The lower suspension point on the suspension arm of the V-shaped shovel 41 is fixed to the extension arm of the cross beam of the frame 3 through a fifth pin shaft 43, and the unfolding arc of the V-shaped shovel is 130°. The upper suspension point of the shovel arm of the V-shaped shovel 41 is connected to the convex plate 42 of the cross beam of the frame through a second bolt 46 and a second punched pin 44; the highly elastic and high-strength second spring 47 is concentrically connected to the second bolt 46, and the second bolt 46 is connected to a second nut 45, replacing the previous lifting device, enabling the soil covering device to automatically adjust the angle according to the working depth and improving the mobility.

[0029] In this embodiment, the pipeline laying device 5 further includes: a pipeline placement optical axis 51, a pipeline baffle 52, and a third pedestal bearing 53; both ends of the pipeline placement optical axis 51 are connected to the third pedestal bearing 53, and the third pedestal bearing 53 is fixed to the outer end of the pipeline baffle 52, and the pipeline baffle 52 is fixed to the upper beam of the suspension frame 2. The pipeline laying device 5 further includes: a sixth bolt 54, a third nut 55, and a fixing bolt 56; the third pedestal bearing 53 is fixed to the outer end of the pipeline baffle 52 through the sixth bolt 54 and the third nut 55, and the pipeline baffle 52 is fixed to the upper beam of the suspension frame 2 through the fixing bolt 56.

[0030] The distance between the rearmost end of the pipeline laying plate 58 and the included angle at the rearmost end of the V-shaped shovel 41 is 30 cm; the lowermost end of the soil scraping plate 119 is parallel to and on the same horizontal plane as the lowermost end of the driven sprocket 16, the trench opening depth does not exceed 50 cm, and the trench opening width does not exceed 20 cm.

[0031] The working principle of the farmland irrigation pipeline trenching and landfilling integrated machine according to the embodiment of the present invention is as follows: Before starting work, the trenching knife needs to be installed on the chain of the trencher, and the chain drive drives the trenching knife to cut the soil. The power of the trencher is provided by the tractor engine. The engine transmits the power through the power output shaft to the transmission system, and the transmission system transmits the power to the main shaft of the trenching device. Under the action of the main shaft, the driving sprocket is driven to rotate, and the driven sprocket rotates at the same speed as the driving sprocket under the action of the chain.

[0032] During operation, the driver controls the hydraulic control system of the tractor through the operating handle on the tractor, so that the working arm of the trenching device tilts down at a certain angle, the trenching knife gradually contacts the ground and has a certain inclination angle with the horizontal direction of the ground to cut the soil, the spiral soil discharger transports the soil cut by the trenching knife to both sides of the ditch, the pipeline laying device is laid under the forward speed of the tractor and the self-gravity of the hose, and the V-shaped shovel is installed at the rear end as a backfilling and covering device, and when the pipeline laying is completed, the crushed soil transported from the spiral soil discharger to both sides of the ditch is gathered and buried as the tractor advances, completing the backfilling and covering operation. The contents not described in detail in this specification belong to the prior art known to professionals in the field. The present invention can realize the three processes of trenching, pipe laying and backfilling of farmland irrigation and drainage pipeline laying at the same time, has the characteristics of simple operation, strong mobility, labor saving, cost saving, etc., can effectively reduce the repeated rolling of farmland soil by operating machinery, and can be widely used in trenching and filling of hoses such as PE pipes under different crop types such as farmland, orchards, and tea gardens.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A farmland irrigation pipeline trenching and landfilling integrated machine, characterized in that, Including: A ditching device (1), a suspension bracket (2), a frame (3), a soil covering device (4) and a pipeline laying device (5); The ditching device (1) includes: a driving sprocket (11), a driving sprocket shaft (12), a vertical block bearing (13), a chain (14), a ditching knife (15), a driven sprocket (16), a first block bearing (17), a driven sprocket shaft (19), a tensioning wheel shaft (110), a tensioning wheel (111), a diamond block bearing (113), a spiral soil discharger (114), a second block bearing (117), a soil scraping plate (119) and a soil scraping plate fixing mechanism (124); The driving sprocket (11) is penetrated by the driving sprocket shaft (12), one end is connected to the second block bearing (117), the second block bearing (117) is fixed on the suspension bracket (2), and the other end passes through the vertical block bearing (13) and is connected to a coupling (115); The vertical block bearing (13) is pin-connected to the extension beam of the suspension bracket (2); The tensioning wheel shaft (110) passes through the tensioning wheel (111) and the diamond block bearing (113), both ends of the tensioning wheel shaft (110) are connected to the spiral soil discharger (114), the driven sprocket shaft (19) passes through the driven sprocket (16) and the first block bearing (17), the diamond block bearing (113) and the first block bearing (17) are fixed on the steel plate at the sprocket placement position of the frame (3), and the ditching knife (15) is fixed on the outer link plate of the chain (14); The lower suspension point of the soil scraping plate (119) is connected to the extension beam of the frame (3), the upper suspension point is connected to the soil scraping plate fixing mechanism (124), and the soil scraping plate fixing mechanism (124) is fixed to the extension beam of the frame (3); The soil covering device (4) includes a V-shaped shovel (41), and the upper suspension point of the shovel arm of the V-shaped shovel (41) is connected to the convex plate (42) of the frame cross beam. The pipeline laying device (5) includes a pipeline fixing plate (57) and a pipeline laying plate (58), the pipeline fixing plate (57) is fixed on the extension beam of the frame (3), and the pipeline laying plate (58) is connected to the soil scraping plate (119).

2. The trench digging and landfilling integrated machine for farmland irrigation pipes according to claim 1, characterized in that, The ditching device (1) further includes: a third bolt (18), a fourth bolt (112), a fifth bolt (118), a first pin shaft (120), a first punching pin (121), a first bolt (122), a first spring (123), a connecting pin (125) and a first nut (126); The lower suspension point of the soil scraping plate (119) is connected to the extension beam of the frame (3) through the first pin shaft (120), the upper suspension point is connected to the first bolt (122) through the first punched pin (121), and the first bolt (122) is connected to the soil scraping plate fixing mechanism (124); the first bolt (122) is connected to the first nut (126), and the first spring (123) is concentrically placed on the first bolt (122); the soil scraping plate fixing mechanism (124) is fixed to the extension beam of the frame (3) through the connecting pin (125); the second pedestal bearing (117) is fixed to the suspension bracket (2) through the fifth bolt (118), and the diamond pedestal bearing (113) and the first pedestal bearing (17) are respectively fixed to the steel plate at the sprocket placement position of the frame (3) through the fourth bolt (112) and the third bolt (18), and the ditching knife (15) is fixed to the outer link plate of the chain (14) through bolts.

3. The ditch-opening and landfilling integrated machine for farmland irrigation pipelines according to claim 1, characterized in that, The corresponding suspension positions of the suspension bracket (2) and the frame (3) are connected by a hydraulic rod (128). The lower end of the hydraulic rod (128) is fixed to the frame (3) through the second pin shaft (116), the upper end is fixed to the suspension bracket (2) through the third pin shaft (129), and the extension arm of the main beam of the frame (3) is connected to the side plate of the suspension bracket (2) through the fourth pin shaft (127).

4. The one-machine for trenching and landfilling of farmland irrigation pipelines according to claim 1, characterized in that, The lower suspension point on the suspension arm of the V-shaped shovel (41) is fixed to the extension arm of the cross beam of the frame (3) through the fifth pin shaft (43), and the unfolding radian of the V-shaped shovel is 130°.

5. A farmland irrigation pipeline trenching and landfilling integrated machine according to claim 1, characterized in that, The upper suspension point of the shovel arm of the V-shaped shovel (41) is connected to the convex plate (42) of the frame cross beam through the second bolt (46) and the second punched pin (44); the second spring (47) is concentrically connected to the second bolt (46), and the second bolt (46) is connected to the second nut (45).

6. The one - machine for trenching and landfilling of farmland irrigation pipelines according to claim 1, wherein, The pipeline laying device (5) further includes: a pipeline placement optical axis (51), a pipeline baffle (52), and a third pedestal bearing (53); Both ends of the pipeline placement optical axis (51) are connected to the third pedestal bearing (53), the third pedestal bearing (53) is fixed to the outer end of the pipeline baffle (52), and the pipeline baffle (52) is fixed to the upper beam of the suspension bracket (2).

7. The one-piece machine for trenching and landfilling farmland irrigation pipelines according to claim 6, wherein, The pipeline laying device (5) further includes: a sixth bolt (54), a third nut (55), and a fixing bolt (56); the third pedestal bearing (53) is fixed to the outer end of the pipeline baffle (52) through the sixth bolt (54) and the third nut (55), and the pipeline baffle (52) is fixed to the upper beam of the suspension bracket (2) through the fixing bolt (56).

8. A trench digging and landfilling integrated machine for farmland irrigation pipelines according to claim 1, characterized in that, The distance between the rearmost end of the pipeline laying plate (58) and the included angle at the rearmost end of the V-shaped shovel (41) is 30 cm; the lowermost end of the soil scraping plate (119) is parallel to and on the same horizontal plane as the lowermost end of the driven sprocket (16), the ditching depth does not exceed 50 cm, and the ditching width does not exceed 20 cm.

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