Farmland irrigation pipeline ditching and landfilling all-in-one machine

Abstract

The invention discloses a ditching and landfilling all-in-one machine for farmland irrigation pipelines. The invention relates to the technical field of agricultural machinery, and solves the problem that an existing irrigation and drainage pipeline laying mode is not suitable for integrated laying of farmland irrigation and drainage pipelines. The all-in-one machine comprises a suspension bracket, a rack, a ditching device, a pipeline laying device and a soil covering device, the ditching device comprises a driving chain wheel, a driven chain wheel, a tensioning wheel, a chain, a chain cutter and a spiral soil discharging device; the pipeline laying device comprises a pipeline placing frame and a pipeline fixing plate; the ditching device, the pipeline laying device and the soil covering device are all installed on the machine frame, the machine frame is connected with the hanging frame through a hydraulic cylinder, and the soil covering device adopts an independent V-shaped shovel to replace an original V-shaped shovel controlled by a hydraulic rod. The farmland irrigation and drainage pipeline laying machine can realize simultaneous implementation of three procedures of ditching, pipe laying and backfilling in farmland irrigation and drainage pipeline laying, has the characteristics of simplicity in operation, high maneuverability, labor saving, cost saving and the like, and can effectively reduce repeated rolling of an operation machine tool on 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; The ditch digging device includes: a driving sprocket, a driving sprocket shaft, a vertical pedestal bearing, a chain, a ditch digging 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 position of the machine frame, and the ditch digging 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.

[0006] Further, the ditch digging 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 position of the machine frame through the fourth bolt and the third bolt, and the ditch digging knife is fixed on the outer link plate of the chain through bolts.

[0007] 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 the second pin shaft, the upper end is fixed to the suspension bracket through the 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 the fourth pin shaft.

[0008] 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 the fifth pin shaft, and the unfolding radian of the V-shaped shovel is 130°.

[0009] 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 the second bolt and the second punching pin; The second spring is concentrically connected to the connecting second bolt, and the second bolt is connected to the second nut.

[0010] Further, the pipeline laying device further includes: a pipeline placement optical axis, a pipeline baffle, and a third pedestal bearing; both ends of the pipeline placement optical axis are connected to the third pedestal bearing, the third pedestal bearing is fixed to the outer end of the pipeline baffle, and the pipeline baffle is fixed to the upper beam of the suspension bracket.

[0011] Further, the pipeline laying device further includes: a sixth bolt, a third nut, and a fixing bolt; the third pedestal bearing is fixed to the outer end of the pipeline baffle through the sixth bolt and the third nut, and the pipeline baffle is fixed to the upper beam of the suspension bracket through the fixing bolt.

[0012] Further, the distance between the rearmost end of the pipeline laying plate and the included angle at the rearmost end of the V-shaped shovel is 30 cm; the lowermost end of the soil scraping plate is parallel to and on the same horizontal plane as the lowermost end of the driven sprocket, the trench opening depth does not exceed 50 cm, and the trench opening width does not exceed 20 cm.

[0013] The present invention has the following beneficial effects: For the integrated machine for trenching and landfilling of farmland irrigation pipelines of the present invention, the bottom of the V-shaped shovel is in horizontal contact with the ground and automatically lifts under the action of a spring, and the unfolding arc of the V-shaped shovel is fixed at 130°, replacing the previous control of the lifting and opening / closing angle of the V-shaped shovel by a hydraulic mechanism, simplifying the operation process of the device, improving the mobility. The V-shaped shovel is installed at the end of the device, and backfilling operation is carried out as the working machine advances, enabling the entire device to complete the operations of trenching, laying pipelines, and landfilling and covering soil at one time, avoiding secondary work of the machine, and reducing the compaction of the soil by the working machine; the trenching device of this integrated machine adopts a chain trencher, replacing the plowshare trencher, making the bottom and walls of the trench neat and standard; the placement position of the trenching device on the frame is welded with steel plates, replacing the previous steel pipe structure, reducing the weight of the machine; the pipeline fixing device can be independently adjusted and replaced according to the pipe diameter, broadening the scope of application and greatly reducing the consumption of manual pipeline laying; the whole machine is lightweight, improving the working efficiency of the machine and saving fuel consumption. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 is the overall structure schematic diagram of an integrated machine for trenching and landfilling of farmland irrigation pipelines of the present invention; Figure 2 is the single-side schematic diagram of an integrated machine for trenching and landfilling of farmland irrigation pipelines of the present invention; Figure 3 is the structure schematic diagram of the soil covering device, the soil scraping plate and the frame; Figure 4 It is a schematic structural diagram of the pipe placement mechanism in the pipe laying device; Figure 5 It is a schematic structural diagram of the soil scraping plate; Figure 6 It is a partial enlarged schematic diagram of a farmland irrigation pipe trenching and landfilling integrated machine of the present invention.

[0016] 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 pedestal bearing; 14 - Chain; 15 - Ditching knife; 16 - Driven sprocket; 17 - First pedestal 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 pedestal bearing; 54 - Sixth bolt; 55 - Third nut; 56 - Fixing bolt; 57 - Pipe fixing plate; 58 - Pipe laying plate; 110 - Tensioning wheel shaft; 111 - Tensioning wheel; 112 - Fourth bolt; 113 - Diamond pedestal bearing; 114 - Spiral soil discharger; 115 - Coupling; 116 - Second pin shaft; 117 - Second pedestal 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

[0017] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may 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 description of this 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 this application belongs.

[0018] Please refer to Figures 1 to 6 , the embodiment of the present invention provides a farmland irrigation pipe 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; 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, 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 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, 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. 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 diameter of the pipeline, enabling the machine to adapt to pipelines of more sizes, expanding the scope of application, and increasing the usage ways.

[0019] 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 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 frame 3 through the connecting pin 125; the second pedestal bearing 117 is fixed on the suspension bracket 2 through the fifth bolt 118, the diamond pedestal bearing 113 and the first pedestal bearing 17 are respectively fixed on 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 on the outer link plate of the chain 14 through bolts.

[0020] 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.

[0021] 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 radian 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 frame cross beam 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.

[0022] In this embodiment, the pipeline laying device 5 further includes: a pipeline placing optical axis 51, a pipeline baffle 52, and a third pedestal bearing 53; both ends of the pipeline placing 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.

[0023] 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.

[0024] 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 trenching knife is driven by the chain drive 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 power is transmitted to the main shaft of the trenching device through the transmission system. 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.

[0025] During operation, the driver controls the hydraulic control system of the tractor through the operating handle on the tractor, causing the working arm of the ditching device to tilt downward by a certain angle. The ditching 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 conveyor transports the soil cut by the ditching knife to both sides of the ditch. The pipeline laying device lays the pipeline under the forward speed of the tractor and the self-weight of the hose. The V-shaped shovel is installed at the rear end as a backfilling and covering device, and when the pipeline laying is completed, it gathers and fills the crushed soil transported from the spiral soil conveyor to both sides of the ditch as the tractor moves forward, completing the backfilling and covering operation. The content not described in detail in this specification belongs to the prior art well-known to professionals in the field. The present invention can simultaneously perform the three processes of ditching, pipe laying, and backfilling for farmland irrigation and drainage pipeline laying, and has the characteristics of simple operation, strong mobility, labor saving, and cost saving. It can effectively reduce the repeated compaction of farmland soil by operation implements and can be widely applied to the ditching and landfill of hoses such as PE pipes under different crop types in farmland, orchards, tea gardens, etc.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A farmland irrigation pipeline trenching and landfilling integrated machine, characterized in that: include: A trenching device (1), a hanging frame (2), a frame (3), a soil covering device (4), and a pipeline laying device (5); The trenching device (1) comprises: a driving sprocket (11), a driving sprocket shaft (12), a vertical seat bearing (13), a chain (14), a trenching knife (15), a driven sprocket (16), a first seat bearing (17), a driven sprocket shaft (19), a tensioning wheel shaft (110), a tensioning wheel (111), a diamond seat bearing (113), a spiral soil ejector (114), a second seat bearing (117), a scraper plate (119), and a scraper plate fixing member. The driving sprocket (11) is penetrated by the driving sprocket shaft (12), one end of which is connected to the second seat bearing (117), the second seat bearing (117) is fixed on the suspension frame (2), and the other end of which passes through the vertical seat bearing (13) and is connected to the coupling (115); the vertical seat bearing (13) is connected to the extension beam pin of the suspension frame (2); the tensioning wheel shaft (110) passes through the tensioning wheel (111) and the diamond seat bearing (113), and the tensioning wheel Both ends of the shaft (110) are connected to the spiral soil ejector (114); the driven sprocket shaft (19) passes through the driven sprocket (16) and the first seat bearing (17); the diamond seat bearing (113) and the first seat bearing (17) are fixed to the steel plate where the sprocket of the frame (3) is placed; the trenching knife (15) is fixed to the outer chain plate of the chain (14); the lower suspension point of the scraper plate (119) is connected to the extension beam of the frame (3); the upper suspension point is connected to the scraper plate fixing mechanism (12 4), the scraper blade fixing mechanism (124) is fixed to the extension beam of the frame (3); the covering device (4) comprises 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 frame cross beam, the pipe laying device (5) comprises a pipe fixing plate (57) and a pipe laying plate (58), the pipe fixing plate (57) is fixed to the extension beam of the frame (3), and the pipe laying plate (58) is connected to the scraper blade (119).

2. The integrated machine for trenching and landfilling farmland irrigation pipes according to claim 1, characterized in that: The trenching device (1) further comprises: 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 scraper blade (119) is connected to the extension beam of the frame (3) through a first pin shaft (120), and the upper suspension point is connected to the first bolt (122) through a first punching pin (121), and the first bolt (122) is connected to the scraper blade 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 scraper blade fixing mechanism (124) is fixed to the extension beam of the frame (3) through a connecting pin (125); the second seat bearing (117) is fixed to the suspension frame (2) through a fifth bolt (118), the diamond seat bearing (113) and the first seat bearing (17) are fixed to the steel plate at the sprocket placement of the frame (3) through a fourth bolt (112) and a third bolt (18) respectively, and the trenching knife (15) is fixed to the outer chain plate of the chain (14) through bolts.

3. The integrated machine for trenching and landfilling farmland irrigation pipes according to claim 1, characterized in that: 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) via a second pin shaft (116); the upper end of the hydraulic rod (128) is fixed to the suspension frame (2) via a 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 frame (2) via a fourth pin shaft (127).

4. The integrated machine for trenching and landfilling farmland irrigation pipes 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 crossbeam of the frame (3) via a fifth pin shaft (43), and the unfolding arc of the V-shaped shovel is 130°.

5. The integrated machine for trenching and landfilling farmland irrigation pipes 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 crossbeam through a second bolt (46) and a second punching 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 integrated machine for trenching and landfilling farmland irrigation pipes according to claim 1, characterized in that: The pipeline laying device (5) further comprises: a pipeline placement optical axis (51), a pipeline baffle (52) and a third seated bearing (53); The two ends of the pipeline placement optical axis (51) are connected to the third seat bearing (53), the third seat 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).

7. The integrated machine for trenching and landfilling farmland irrigation pipes according to claim 6, characterized in that: The pipeline laying device (5) further comprises: a sixth bolt (54), a third nut (55) and a fixing bolt (56); the third seat bearing (53) is fixed to the outer end of the pipeline baffle (52) by means of 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) by means of the fixing bolt (56).

8. The integrated machine for trenching and landfilling farmland irrigation pipes according to claim 1, characterized in that: The distance between the rear end of the pipeline laying plate (58) and the rear end of the V-shaped shovel (41) at the angle is 30 cm; the bottom end of the scraper plate (119) is parallel to the bottom end of the driven sprocket (16) and is on the same horizontal plane; the trenching depth does not exceed 50 cm, and the trenching width does not exceed 20 cm.

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