Ditching and soil covering mechanism

Abstract

The utility model provides a ditching earthing mechanism which comprises a rack, a floating component, an adjusting component, an earthing pinch roller and a ditching component, the floating component comprises a connecting part and a floating part, the connecting part is fixedly connected with the rack, a first end of the floating part is rotatably connected with the connecting part, and a second end of the floating part is rotatably connected with the earthing pinch roller. The soil covering pressing wheel is connected to the second end of the floating part and rotatably arranged around the axis of the soil covering pressing wheel, the adjusting assembly is connected to the connecting part and movably arranged in the vertical direction, and the ditching assembly is connected to the adjusting assembly. In this way, the adjusting assembly and the floating part are mutually independent during floating movement, the soil covering pressing wheel is adjusted in a floating mode through the floating part, the ditching assembly is vertically adjusted through the adjusting assembly so as to adapt to different soil height changes, the adaptability is better, the ditching operation and the soil covering operation can both keep the good effect, and the operation quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery and equipment, in particular to a ditching and soil covering mechanism. Background Art

[0002] With the development of technology, automated agricultural equipment has also increased. It is widely used in farming operations, can replace manual work, and greatly improve farming efficiency.

[0003] Sowing is one of the most important links in farming operations, and before sowing, furrows need to be dug and soil covered so that subsequent seeds can be sown smoothly in the furrow soil. When encountering places with different soil heights during the furrowing and soil covering process, it is necessary to control the change of the pressure wheel to adapt to the height of the soil. In the existing technology, the pressure wheel height can be adjusted in real time by setting the pressure wheel to float, but when the pressure wheel floats, it will drive the furrowing disc to float together, resulting in changes in the furrowing depth of the furrowing disc, which will affect the furrowing effect.

[0004] In view of this, it is necessary to propose a trenching and soil covering mechanism to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of the utility model is to provide a ditching and soil covering mechanism to solve the problem in the prior art that the ditching disc of the ditching and soil covering mechanism floats synchronously with the pressure wheel, thereby affecting the ditching effect.

[0006] To achieve the above-mentioned purpose, the utility model provides a trenching and soil covering mechanism, comprising a frame, a floating assembly, an adjustment assembly, a soil covering pressure wheel and a trenching assembly; wherein,

[0007] The floating assembly includes a connecting portion and a floating portion, wherein the connecting portion is fixedly connected to the frame, a first end of the floating portion is rotatably connected to the connecting portion, and the soil covering pressure wheel is connected to the second end of the floating portion and is rotatably arranged around its own axis;

[0008] The adjusting component is connected to the connecting portion and is movably arranged in the vertical direction. The ditching component is connected to the adjusting component.

[0009] Preferably, the connecting portion comprises two supporting longitudinal rods arranged opposite to each other in the transverse direction, and the floating portion comprises two floating rods arranged opposite to each other in the transverse direction; wherein,

[0010] The two supporting longitudinal rods are respectively fixedly connected to both sides of the frame, the first end of the floating rod is hinged to the supporting longitudinal rod, and the soil covering pressure wheel is rotatably connected between the second ends of the two floating rods.

[0011] Preferably, the floating assembly further comprises two floating limit units arranged opposite to each other in the transverse direction, each of the floating limit units comprising an ear plate, a mounting block, a first screw, a first pre-tightening nut and a first limit nut, wherein;

[0012] The ear plate is connected to one end of the supporting longitudinal rod close to the floating rod, and the mounting block is rotatably connected to the ear plate. A first through hole is provided on the mounting block, and the bottom end of the first screw rod is hinged to the floating rod. The top end of the first screw rod passes through and extends out of the first through hole. The first pre-tightening nut and the first limiting nut are both threadedly connected to the first screw rod, wherein the first pre-tightening nut is arranged above the mounting block and is abutted against the mounting block, and the first limiting nut is arranged below the mounting block and is adjustable.

[0013] Preferably, the adjustment assembly includes a connecting cross bar and two connecting brackets arranged opposite to each other in the transverse direction. The two connecting brackets are respectively fixed on the two supporting longitudinal bars. Each connecting bracket has a slide groove extending vertically. The two ends of the connecting cross bar are movably connected to the slide groove in the vertical direction, and the ditching assembly is connected to the connecting cross bar.

[0014] Preferably, the adjustment assembly further comprises two adjustment limit units arranged opposite to each other in the transverse direction, each of the adjustment limit units comprises a second screw, a second pre-tightening nut and a second limit nut; wherein,

[0015] The bottom end of the second screw is hinged to the top end of the connecting cross bar, and a second through hole is opened on the top of the connecting bracket. The top end of the second screw passes through and extends out of the second through hole. The second pre-tightening nut and the second limiting nut are both threadedly connected to the second screw, wherein the second pre-tightening nut is arranged above the connecting bracket and is abutted against the connecting bracket, and the second limiting nut is arranged on the inner side of the connecting bracket and can be adjusted.

[0016] Preferably, the number of the first pre-tightening nuts is two, and the number of the second pre-tightening nuts is two.

[0017] Preferably, the trenching assembly comprises a plurality of trenching disc units spaced apart in the transverse direction, and the top ends of the trenching disc units are connected to the connecting cross bar.

[0018] Preferably, every two adjacent ditching disc units are staggered in the transverse direction so as to be respectively arranged on both sides of the connecting cross bar.

[0019] Preferably, each of the trenching disc units comprises a connecting rod and two trenching discs, the top end of the connecting rod is connected to the connecting cross bar, and the two trenching discs are rotatably connected to both sides of the bottom end of the connecting rod.

[0020] Preferably, each of the furrowing disc units further comprises a cover plate, which is connected to the connecting rod and covers the furrowing disc, and a sowing hole for a sowing pipe to pass through is formed on the cover plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The utility model provides a trenching and soil covering mechanism, comprising a frame, a floating assembly, an adjustment assembly, a soil covering pressure wheel, and a trenching assembly, wherein the floating assembly comprises a connecting portion and a floating portion, the connecting portion being fixedly connected to the frame, the first end of the floating portion being rotatably connected to the connecting portion, the soil covering pressure wheel being connected to the second end of the floating portion and being rotatably arranged around its own axis, the adjustment assembly being connected to the connecting portion and being vertically movable, and the trenching assembly being connected to the adjustment assembly. In this way, the adjustment assembly and the floating portion are independent of each other during floating movement, the soil covering pressure wheel is floatingly adjusted by the floating portion, and the trenching assembly is vertically adjusted by the adjustment assembly to respectively adapt to different soil height changes, thereby achieving better adaptability, so that both trenching and soil covering operations maintain good results, and improving operation quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a three-dimensional schematic diagram of the overall structure of an embodiment of the present invention;

[0025] Figure 2 A side view of the overall structure of an embodiment of the present invention;

[0026] Figure 3 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0027] Figure 4 for Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0028] Figure 5 It is a three-dimensional schematic diagram of a trenching disc unit in one embodiment of the present invention.

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0030] Description of Figure Numbers:

[0031] 10. Floating assembly; 110. Connecting part; 111. Supporting longitudinal rod; 120. Floating part; 121. Floating rod; 130. Floating limit unit; 131. Ear plate; 132. Mounting block; 133. First screw rod; 134. First pre-tightening nut; 135. First limit nut; 20. Adjusting assembly; 210. Connecting cross bar; 220. Connecting bracket; 221. Slide; 230. Adjusting limit unit; 231. Second screw rod; 232. Second pre-tightening nut; 233. Second limit nut; 30. Soil covering wheel; 40. Ditching assembly; 410. Ditching disc unit; 411. Connecting rod; 412. Ditching disc; 413. Cover plate; 50. Frame. DETAILED DESCRIPTION

[0032] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0036] Please see the attached Figure 1-5In one embodiment, the present invention provides a trenching and soil covering mechanism, which includes a frame 50, a floating component 10, an adjustment component 20, a soil covering pressure wheel 30, and a trenching component 40. First of all, it should be noted that the transverse direction in this application refers to the width direction of the structure (perpendicular to the propulsion direction of the machine), which can be specifically referred to the markings in the accompanying drawings, and the longitudinal direction is the extension direction perpendicular to the transverse direction; and it is different from the prior art that the pressure wheel height can be adjusted in real time by setting the pressure wheel to float, but when the pressure wheel floats, it will drive the trenching disc to float together, resulting in a change in the trenching depth of the trenching disc, which will affect the trenching effect. The present application solves the above-mentioned defects in the prior art by setting a trenching and soil covering mechanism, which is as follows:

[0037] The floating assembly 10 includes a connecting portion 110 and a floating portion 120. The connecting portion 110 is fixedly connected to the frame 50. The first end of the floating portion 120 is rotatably connected to the connecting portion 110. The soil covering wheel 30 is connected to the second end of the floating portion 120 and is rotatably arranged around its own axis. The adjusting assembly 20 is connected to the connecting portion 110 and is vertically movably arranged. The trenching assembly 40 is connected to the adjusting assembly 20.

[0038] Specifically, the trenching and soil covering mechanism in the present application includes a frame 50, a floating component 10, an adjusting component 20, a soil covering pressure wheel 30 and a trenching component 40. The frame 50 is used to be connected to the operating machine and is also used for the installation and connection of the floating component 10. The floating component 10 is used for the soil covering pressure wheel 30 to be connected and floated, so that when the soil covering pressure wheel 30 encounters highly uneven soil, it can adaptively adjust the soil height and float to ensure the soil covering effect; and the adjusting component 20 is used for the trenching component 40 to be connected and floated, so that when the trenching encounters highly uneven soil, it can adaptively adjust the height vertically to ensure the trenching effect. In this way, the effect of adaptive floating adjustment can be achieved during both soil covering and trenching.

[0039] The floating assembly 10 includes a connecting portion 110 and a floating portion 120, wherein the connecting portion 110 is used to be fixed to the frame 50 so that the floating assembly 10 and the adjusting assembly 20 are independent of each other when connected, so that they do not affect each other when floating with each other, wherein the floating portion 120 can facilitate the floating adjustment of the soil covering pressure wheel 30, and its first end is rotatably connected to the connecting portion 110, and the second end is used for connecting the soil covering pressure wheel 30, so that the soil covering pressure wheel 30 connected to the second end of the floating portion 120 can rotate around the first end of the floating portion 120. The end swings to adapt to floating adjustment according to different soil heights; and the adjusting component 20 is also connected to the connecting part 110. Because the connecting part 110 is fixed to the frame 50, the floating part 120 and the adjusting component 20 respectively connected to the connecting part 110 will operate independently without affecting each other. The adjusting component 20 is movably arranged in the vertical direction so that the ditching component 40 can adapt to move up and then ditch when it contacts soil of different heights, and it is not synchronized with the floating adjustment of the floating part 120 to ensure a better ditching effect.

[0040] As a preferred embodiment of the present invention, the connecting portion 110 includes two supporting longitudinal rods 111 disposed opposite to each other in the transverse direction, and the floating portion 120 includes two floating rods 121 disposed opposite to each other in the transverse direction; wherein,

[0041] The two supporting longitudinal rods 111 are respectively fixedly connected to the two sides of the frame 50 , the first end of the floating rod 121 is hinged to the supporting longitudinal rod 111 , and the soil covering pressure wheel 30 is rotatably connected between the second ends of the two floating rods 121 .

[0042] It should be noted that two laterally opposed supporting longitudinal rods 111 are provided so as to form a sufficient space for placing the trenching assembly 40 and the soil-covering pressure wheel 30, and two laterally opposed floating rods 121 are provided so as to facilitate connecting the laterally extending soil-covering pressure wheel 30 between the two floating rods 121. It is more convenient for the floating rod 121 to be connected to the supporting longitudinal rod 111 in a hinged manner, and the rotation effect is better.

[0043] As a preferred embodiment of the present invention, the floating assembly 10 further includes two floating limit units 130 arranged opposite to each other in the transverse direction, each of the floating limit units 130 includes an ear plate 131, a mounting block 132, a first screw 133, a first pre-tightening nut 134 and a first limit nut 135, wherein;

[0044] The ear plate 131 is connected to one end of the supporting longitudinal rod 111 close to the floating rod 121, and the mounting block 132 is rotatably connected to the ear plate 131. A first through hole is provided on the mounting block 132, and the bottom end of the first screw rod 133 is hinged to the floating rod 121. The top end of the first screw rod 133 passes through and extends out of the first through hole. The first pre-tightening nut 134 and the first limiting nut 135 are both threadedly connected to the first screw rod 133, wherein the first pre-tightening nut 134 is arranged above the mounting block 132 and is abutted against the mounting block 132, and the first limiting nut 135 is arranged below the mounting block 132 and is adjustable.

[0045] It should be noted that the floating limit unit 130 is used to limit the floating range of the floating assembly 10 to avoid the floating range being too large and thus affecting the operation of the whole machine. By setting two floating limit units 130 arranged opposite to each other in the transverse direction, the range is limited synchronously from both sides, which specifically includes an ear plate 131, a mounting block 132, a first screw 133, a first pre-tightening nut 134 and a first limiting nut 135. The ear plate 131 is used for the installation of the mounting block 132, and the mounting block 132 is used for the first screw 133 is installed through, and a first through hole is opened on the mounting block 132 for the first screw 133 to be installed through. The first through hole has no internal thread, so that the first screw 133 can slide up and down along the first through hole to maintain the floating adjustability of the floating part 120. The first pre-tightening nut 134 is set against the mounting block 132 to prevent loosening. After the first pre-tightening nut 134 forms a boundary above the mounting block 132, the spacing between the first limiting nut 135 and the mounting block 132 is The floating range is formed by adjusting the position of the first limiting nut 135 according to actual needs, so as to change the floating range. For example, when the first limiting nut 135 is located on the first screw rod 133 and is spaced apart from the mounting block 132 (such as the bottom, the middle, etc.), the distance between the first limiting nut 135 and the mounting block 132 is the floating range. When the soil covering pressing wheel 30 presses against the raised soil, the reaction force is applied so that the first screw rod 133 is pushed upward along the first through hole. 32 are in abutment with each other, floating adjustment can no longer be continued; and when the technician wants to keep the covering pressure wheel 30 in a non-floating state, the first limiting bolt can be adjusted to a state of being in abutment with the mounting block 132. At this time, the spacing distance between the first limiting bolt and the mounting block 132 is 0, and under the interaction of the first limiting bolt and the first pre-tightening bolt, there will be no floating; wherein, the mounting block 132 is rotatably connected to the ear plate 131, so that the angle can be changed in real time during floating adjustment, thereby avoiding structural damage caused by rigid connection.

[0046] As a preferred embodiment of the present invention, the adjustment assembly 20 includes a connecting cross bar 210 and two connecting brackets 220 arranged opposite to each other in the transverse direction. The two connecting brackets 220 are respectively fixed on the two supporting longitudinal bars 111. Each of the connecting brackets 220 has a slide groove 221 extending vertically. The two ends of the connecting cross bar 210 are movably connected to the slide groove 221 in the vertical direction, and the ditching assembly 40 is connected to the connecting cross bar 210.

[0047] It is worth noting that the connecting cross bar 210 is used for connecting and installing the ditching assembly 40, and the two connecting brackets 220 are used for connecting and installing the connecting cross bar 210. A groove 221 is formed in the recess of the connecting bracket 220, and the groove 221 is used for the sliding setting of the connecting cross bar 210, so as to achieve the effect of vertical floating adjustment.

[0048] As a preferred embodiment of the present invention, the adjustment assembly 20 further includes two adjustment limit units 230 arranged opposite to each other in the transverse direction, each of the adjustment limit units 230 includes a second screw 231, a second pre-tightening nut 232 and a second limit nut 233; wherein,

[0049] The bottom end of the second screw rod 231 is hinged to the top end of the connecting cross bar 210, and a second through hole is opened at the top of the connecting bracket 220. The top end of the second screw rod 231 passes through and extends out of the second through hole. The second pre-tightening nut 232 and the second limiting nut 233 are both threadedly connected to the second screw rod 231, wherein the second pre-tightening nut 232 is arranged above the connecting bracket 220 and is abutted against the connecting bracket 220, and the second limiting nut 233 is arranged on the inner side of the connecting bracket 220 and can be adjusted.

[0050] It is worth noting that, similar to the floating limit unit 130, the adjustment limit unit 230 is used to limit the vertical floating adjustment range of the adjustment assembly 20, and also avoids the vertical floating range being too large, thereby affecting the operation and walking of the entire machine. By setting two adjustment limit units 230 arranged opposite to each other in the horizontal direction, the range is limited synchronously from both sides. It specifically includes a second screw 231, a second pre-tightening nut 232 and a second limiting nut 233. The second pre-tightening nut 232 is abutted against the top of the connecting bracket 220 to prevent loosening. After the second pre-tightening nut 232 is pre-tightened as the boundary of the top, the spacing distance between the second limiting nut 233 arranged on the inner side of the connecting bracket 220 and the connecting bracket 220 is the vertical floating range. Technicians can adjust the position of the second limiting nut 233 according to actual needs to change the vertical floating range. Its principle is the same as that of the floating limit unit 130. When vertical floating is not required, the second limiting nut 233 is screwed until it abuts against the connecting bracket 220.

[0051] Furthermore, the number of the first pre-tightening nuts 134 is two, and the number of the second pre-tightening nuts 232 is two.

[0052] It should be noted that when two nuts apply pre-tightening force at the same time, the pre-tightening force is better than that of a single nut and the anti-loosening effect is better. Therefore, the number of the first pre-tightening nut 134 and the second pre-tightening nut 232 can be set to two, and pre-tightening is performed in a superimposed manner.

[0053] Furthermore, the trenching assembly 40 includes a plurality of trenching disc units 410 spaced apart in the transverse direction, and the top ends of the trenching disc units 410 are connected to the connecting cross bar 210 .

[0054] It should be understood that providing a plurality of the trenching disc units 410 can simultaneously achieve the effect of trenching multiple soils at one time.

[0055] Furthermore, every two adjacent trenching disc units 410 are staggered in the transverse direction so as to be arranged on both sides of the connecting cross bar 210 respectively.

[0056] It should be noted that this makes the spacing between the trenching disc units 410 on each side larger, and the staggered distribution method is more convenient for installation.

[0057] Furthermore, each of the trenching disc units 410 includes a connecting rod 411 and two trenching discs 412 , the top end of the connecting rod 411 is connected to the connecting cross bar 210 , and the two trenching discs 412 are rotatably connected to both sides of the bottom end of the connecting rod 411 .

[0058] It should be noted that the connecting rod 411 is used for the installation of the furrowing disc 412, and its top end is used to be connected to the connecting cross bar 210, which can be more conveniently disassembled and assembled by bolt connection, and the two furrowing discs 412 are rotatably connected to the two sides of the bottom end of the connecting rod 411, and can be arranged close to each other in the direction of machine propulsion, thereby pushing the soil outward to form a groove for seeds to fall into.

[0059] Furthermore, each of the furrowing disc units 410 further includes a cover plate 413, which is connected to the connecting rod 411 and covers the furrowing disc 412, and a sowing hole for a sowing pipe to pass through is opened on the cover plate 413.

[0060] It is understandable that the cover plate 413 can be used to retain soil, and a sowing hole is provided on the top thereof for the sowing tube to pass through, so that the seeds can slide through the sowing tube and fall directly between the two furrowing plates 412, that is, fall into the opened groove.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A trenching and soil covering mechanism, characterized in that: It includes a frame, a floating assembly, an adjustment assembly, a covering wheel and a trenching assembly; wherein, The floating assembly includes a connecting portion and a floating portion, wherein the connecting portion is fixedly connected to the frame, a first end of the floating portion is rotatably connected to the connecting portion, and the soil covering pressure wheel is connected to the second end of the floating portion and is rotatably arranged around its own axis; The adjusting component is connected to the connecting portion and is movably arranged in the vertical direction. The ditching component is connected to the adjusting component.

2. The trenching and soil covering mechanism according to claim 1, characterized in that: The connecting portion includes two supporting longitudinal rods arranged opposite to each other in the transverse direction, and the floating portion includes two floating rods arranged opposite to each other in the transverse direction; wherein, The two supporting longitudinal rods are respectively fixedly connected to both sides of the frame, the first end of the floating rod is hinged to the supporting longitudinal rod, and the soil covering pressure wheel is rotatably connected between the second ends of the two floating rods.

3. The trenching and soil covering mechanism according to claim 2, characterized in that: The floating assembly further comprises two floating limit units arranged opposite to each other in the transverse direction, each of the floating limit units comprising an ear plate, a mounting block, a first screw, a first pre-tightening nut and a first limit nut, wherein; The ear plate is connected to one end of the supporting longitudinal rod close to the floating rod, and the mounting block is rotatably connected to the ear plate. A first through hole is provided on the mounting block, and the bottom end of the first screw rod is hinged to the floating rod. The top end of the first screw rod passes through and extends out of the first through hole. The first pre-tightening nut and the first limiting nut are both threadedly connected to the first screw rod, wherein the first pre-tightening nut is arranged above the mounting block and is abutted against the mounting block, and the first limiting nut is arranged below the mounting block and is adjustable.

4. The trenching and soil covering mechanism according to claim 3, characterized in that: The adjustment assembly includes a connecting cross bar and two connecting brackets arranged opposite to each other in the transverse direction. The two connecting brackets are respectively fixed on the two supporting longitudinal bars. Each connecting bracket has a slide groove extending vertically. The two ends of the connecting cross bar are movably connected to the slide groove in the vertical direction. The ditching assembly is connected to the connecting cross bar.

5. The trenching and soil covering mechanism according to claim 4, characterized in that: The adjustment assembly further includes two adjustment limit units arranged opposite to each other in the transverse direction, each of the adjustment limit units includes a second screw, a second pre-tightening nut and a second limit nut; wherein, The bottom end of the second screw is hinged to the top end of the connecting cross bar, and a second through hole is opened on the top of the connecting bracket. The top end of the second screw passes through and extends out of the second through hole. The second pre-tightening nut and the second limiting nut are both threadedly connected to the second screw, wherein the second pre-tightening nut is arranged above the connecting bracket and is abutted against the connecting bracket, and the second limiting nut is arranged on the inner side of the connecting bracket and can be adjusted.

6. The trenching and soil covering mechanism according to claim 5, characterized in that: The number of the first pre-tightening nuts is two, and the number of the second pre-tightening nuts is two.

7. The trenching and soil covering mechanism according to claim 4, characterized in that: The trenching assembly includes a plurality of trenching disc units spaced apart in a transverse direction, and the top ends of the trenching disc units are connected to the connecting cross bar.

8. The trenching and soil covering mechanism according to claim 7, characterized in that: Every two adjacent ditching disc units are staggered in the transverse direction so as to be respectively arranged on both sides of the connecting cross bar.

9. The trenching and soil covering mechanism according to claim 7, characterized in that: Each of the trenching disc units comprises a connecting rod and two trenching discs, the top end of the connecting rod is connected to the connecting cross bar, and the two trenching discs are rotatably connected to both sides of the bottom end of the connecting rod.

10. The trenching and soil covering mechanism according to claim 9, characterized in that: Each of the furrowing disc units further comprises a cover plate, which is connected to the connecting rod and is arranged above the furrowing disc, and a sowing hole for a sowing pipe to pass through is formed on the cover plate.

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