Soil secondary compacting device with adjustable compacting range for agricultural sowing

Abstract

The invention discloses a soil secondary compacting device with an adjustable compacting range for agricultural seeding, and belongs to the technical field of soil compacting, the soil secondary compacting device comprises a frame, a support steel frame is fixed on the frame, and two groups of compacting mechanisms arranged front and back are arranged on the support steel frame; the pressing mechanism comprises a fixed support fixed to the supporting steel frame, a fixed pressing wheel is rotationally connected to the fixed support, and a plurality of movable pressing wheels which are sequentially arranged in the axis direction are arranged on one side of the fixed pressing wheel. The fixed pressing wheel and the movable pressing wheel of the pressing mechanism on the front side and the corresponding fixed pressing wheel and the corresponding movable pressing wheel in the pressing mechanism on the rear side are distributed in a staggered mode. And a shifting mechanism for adjusting the positions of the movable pressing wheels in the pressing mechanism and further adjusting the distance between the fixed pressing wheels and the movable pressing wheels and the distance between every two adjacent movable pressing wheels is arranged on the fixed bracket. By adjusting the position of the movable pressing wheel, the compaction range is rapidly adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of farmland soil compaction, in particular to a soil secondary compaction device for agricultural sowing with an adjustable compaction range. Background Art

[0002] Secondary compaction of agricultural sowing soil is a technology that compacts the soil again after sowing, which can improve the contact tightness between soil and seeds, reduce soil pores, prevent water evaporation, promote seed water absorption and germination, thereby improving the emergence rate and seedling uniformity and strong seedlings. For example, a wheat sowing integrated machine with soil crushing and leveling secondary compaction function with publication number CN210275043U is used to solve the problems of inconsistent wheat sowing depth, weak grip, and poor soil water storage capacity when sowing wheat on soil after rotary tillage; the integrated machine includes a frame, and also includes a fertilizer unit, a driving rake, a first compaction roller, a sowing unit, and a second compaction roller arranged on the frame and arranged sequentially from front to back; after the summer corn is harvested, the soil is rotary tilled, fertilizer is evenly spread on the surface after rotary tillage, and then the soil is crushed, and then the soil treated with fertilizer is compacted once, wheat is sown, and the soil is compacted twice to achieve the consistency of wheat sowing depth and ensure the strong wheat seedling rate. A double-stage suppression device for sowing small-grain crops with publication number CN106385818A adopts secondary graded suppression technology to improve sowing quality, achieve consistency of sowing depth and provide a favorable environment for seed growth, aiming at the problems that sowing depth of small-grain crops is difficult to control and sowing quality is poor. The suppression device consists of a front suppression ditching wheel, a connecting rod support frame, a rear suppression wheel, a soil covering mechanism, an adjustment spring, a seed meter and a seed box. The front suppression ditching wheel and the rear suppression wheel are hinged at both ends of the connecting rod support frame, the soil covering mechanism is located between the front suppression ditching wheel and the rear suppression wheel, the connecting rod support frame is hinged on the seed meter that has relative sliding with the seed box, one end of the adjustment spring is connected to the seed box, and the other end is connected to the connecting rod support frame, the front suppression ditching wheel adopts a wedge wheel to squeeze and open furrows, and the uneven surface is preliminarily suppressed and leveled before sowing. After sowing, the rear suppression wheel performs secondary suppression to form tight and loose alternating soil conditions.The invention discloses a crushing soil covering and suppressing device for barley seeds, which is published as CN118614211A. The device comprises a frame, a mesh belt conveyor, a crushing mechanism, a suppressing mechanism and a feeding mechanism. A feeding mechanism for collecting agglomerated soil is installed at the front end of the frame, and a mesh belt conveyor for screening soil is installed on the frame. The seeds in the seed furrow are covered with the fine-grained soil screened by the mesh belt conveyor for the first time. The discharge end of the mesh belt conveyor is connected to the crushing mechanism, and the agglomerated soil is crushed into large-grained soil blocks by the crushing mechanism. The seeds in the seed furrow are covered with the large-grained soil blocks for the second time. A suppressing mechanism for suppressing the covering soil is also arranged at the rear end of the frame, which can collect the agglomerated soil. The seeds are collected, screened, crushed, and covered with a double layer of soil. The lower layer is fine-grained soil to retain moisture and heat for the seeds, and the upper layer is large-grained soil blocks to reduce the impact of wind and water erosion on the soil. However, the scope of agricultural sowing varies according to actual needs. The sowing method is generally directional sowing along the direction of the farmland according to a certain width. At present, some suppression devices cannot adjust the compaction range according to the sowing range. If the suppression area is too large, the soil that has not been sown next to it will be compacted, which is not conducive to the subsequent seeds entering the soil layer. If the suppression area is too small, the soil compaction is insufficient, and secondary equipment is required to suppress the soil layer. In addition, the soil covering the surface of some farmlands is unevenly distributed, and the suppression effect of the soil layer with obvious bumps is poor.

[0003] In view of the above problems, it is urgently necessary to carry out innovative design based on the original agricultural soil suppression device. Summary of the invention

[0004] The purpose of the present invention is to provide a secondary soil compaction device for agricultural sowing with an adjustable compaction range, so as to solve the problem in the above background technology that some compaction devices cannot adjust the compaction range according to the sowing range. If the compaction area is too large, it will compact the nearby soil that has not been sown, which is not conducive to the subsequent seeds entering the soil layer. If the compaction area is too small, it will lead to insufficient soil compaction, and secondary equipment equipment is required to compact the soil layer.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a secondary soil pressing device for agricultural sowing with an adjustable compaction range, comprising a frame, a supporting steel frame is welded and fixed on the frame, and two groups of front and rear pressing mechanisms are arranged on the supporting steel frame; the pressing mechanism comprises a fixed bracket fixed on the supporting steel frame, a fixed pressing wheel is rotatably connected to the fixed bracket, and a plurality of movable pressing wheels arranged in sequence along the axial direction are arranged on one side of the fixed pressing wheel, and the pressing mechanism close to one side of the frame is a front pressing mechanism, and the number of movable pressing wheels of the front pressing mechanism is one more than the number of movable pressing wheels in the rear pressing mechanism, and the fixed pressing wheel and the movable pressing wheel of the front pressing mechanism are staggered with the corresponding fixed pressing wheels and the movable pressing wheels in the rear pressing mechanism; The fixed bracket is provided with a displacement mechanism for adjusting the position of the movable pressing wheel in the pressing mechanism, thereby adjusting the distance between the fixed pressing wheel and the movable pressing wheel and between two adjacent movable pressing wheels.

[0006] Furthermore, the shifting mechanism includes a mobile bracket, the mobile pressure wheel is rotatably mounted on the corresponding mobile bracket, a sliding bracket is fixed on the mobile bracket, the sliding bracket on the mobile bracket close to the fixed bracket is slidably connected to the fixed bracket, and the sliding brackets on other mobile brackets are slidably connected to adjacent mobile brackets.

[0007] Furthermore, a rectangular rod arranged along the axial direction is fixed to the end of the movable pressure wheel, and the rectangular rod is slidably connected to the adjacent movable pressure wheel or the fixed pressure wheel.

[0008] Furthermore, a cylindrical rod is fixedly connected to the middle position of the top of the fixed bracket and the movable bracket, and each of the cylindrical rods is rotatably connected to an upper rotating rod and a lower rotating rod which are cross-arranged up and down; the upper rotating rods and the lower rotating rods are multiple groups arranged in sequence, and the upper rotating rod of any group is rotatably connected to the end of the lower rotating rod of the adjacent group, and the lower rotating rod of any group is rotatably connected to the end of the upper rotating rod of the adjacent group.

[0009] Furthermore, an electric-driven telescopic rod is fixedly mounted on the supporting steel frame, an output end of the electric-driven telescopic rod has a positioning bracket, a positioning column is mounted on the positioning bracket, and the positioning column is sleeved on a cylindrical rod at the top of the movable bracket close to the fixed bracket.

[0010] Furthermore, the frame is provided with a leveling mechanism for reciprocatingly combing the farmland soil.

[0011] Furthermore, the leveling mechanism comprises a rotating shaft rotatably connected to the frame, a sleeve rod is sleeved and installed on the outside of the rotating shaft, and a plurality of rake frames are fixedly connected to the sleeve rod at equal intervals.

[0012] Furthermore, a guide slide bar is fixedly mounted on the frame, a guide slide seat is slidably mounted on the guide slide bar, and the guide slide seat is fixedly connected to the outer side surface of the sleeve rod.

[0013] Furthermore, an arc-shaped groove is formed on the outside of the rotating shaft, a sliding block is slidably connected in the arc-shaped groove, and the sliding block is fixedly mounted on the inner side wall of the sleeve rod.

[0014] Furthermore, the end of the fixed pressure wheel has an active curved rod arranged along the axial direction of the fixed pressure wheel, the rotating shaft is fixedly connected to a driven support rod, the driven support rod is rotatably connected to a transmission rod, and the transmission rod is rotatably connected to the active curved rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention is provided with two sets of pressing mechanisms on the rear side of the frame, the main structure of the pressing mechanism includes a fixed pressing wheel and a movable pressing wheel, the fixed pressing wheel and the movable pressing wheel in the front and rear pressing mechanisms are staggered, and the soil on the surface of the farmland can be effectively pressed through secondary pressing. Furthermore, a shifting mechanism for adjusting the spacing between the fixed pressing wheel and the plurality of movable pressing wheels is provided on the fixed bracket, and the spacing between the fixed pressing wheel and the plurality of movable pressing wheels is adjusted according to the sowing range of the farmland, and the movable bracket is controlled to move equidistantly along the axis direction of the fixed pressing wheel, so as to keep the distance between the adjacent fixed pressing wheels and the movable pressing wheels the same, and adjust the actual pressing range.

[0016] The electric drive telescopic rod is operated to control the movement of the positioning bracket, and the positioning bracket pushes a mobile bracket near the fixed bracket to move. At this time, the cross-connected upper rotating rod and the lower rotating rod are rotated and adjusted. Under the rotation thrust of multiple upper rotating rods and lower rotating rods, multiple mobile brackets move with equal displacement, thereby adjusting the distance between the fixed pressure wheel and multiple mobile pressure wheels at equal intervals. Furthermore, a leveling mechanism for reciprocatingly combing the farmland soil is set on the frame. In the process of the mobile frame pressing the soil, the bottom of the rake frame contacts the protruding soil, and the rake frame moves directional with the frame, which can push and disperse the protruding soil to keep the soil distribution relatively uniform.

[0017] When the fixed pressure wheel rotates, the active curved rod, the driven support rod and the transmission rod can control the rotating shaft to reciprocate at a certain angle. When the rotating shaft reciprocates, the arc groove and the slider can control the sleeve rod to move back and forth along the direction of the guide slide rod, so that the rake frame can move back and forth laterally while following the movement of the frame, thereby improving the effect of the rake frame in pushing and dispersing the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the frame of the present invention.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the supporting steel frame of the present invention.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the fixed pressure wheel of the present invention.

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the movable pressing wheel of the present invention.

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the upper rotating rod and the lower rotating rod of the present invention.

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the rake frame of the present invention.

[0024] Figure 7It is a schematic diagram of the three-dimensional structure of the rotating shaft of the present invention.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the guide slide bar of the present invention.

[0026] Fig. 9 It is a schematic diagram of the cross-sectional structure of the sleeve rod of the present invention.

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the transmission rod of the present invention.

[0028] In the figure: 1. frame; 2. supporting steel frame; 3. fixed bracket; 4. fixed pressure wheel; 5. sliding frame; 6. movable bracket; 7. movable pressure wheel; 8. rectangular rod; 9. rectangular groove; 10. cylindrical rod; 11. lower rotating rod; 12. upper rotating rod; 13. positioning column; 14. electric drive telescopic rod; 15. positioning bracket; 16. rotating shaft; 17. sleeve rod; 18. rake frame; 19. guide slide rod; 20. guide slide seat; 21. arc groove; 22. slider; 23. active curved rod; 24. driven support rod; 25. transmission rod. DETAILED DESCRIPTION

[0029] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1-Figure 10 The present invention provides the following technical solution: A secondary soil pressing device for agricultural sowing with an adjustable compaction range, comprising a frame 1 that travels and moves on a farmland, a supporting steel frame 2 is welded and fixed on the frame 1, and two groups of pressing mechanisms arranged in front and behind are arranged on the supporting steel frame 2. The pressing mechanism comprises a fixed bracket 3 fixed on the supporting steel frame 2, a fixed pressing wheel 4 is rotatably connected to the fixed bracket 3, and a plurality of mobile pressing wheels 7 arranged along the axis direction are arranged on one side of the fixed pressing wheel 4, and the number of mobile pressing wheels 7 in the front pressing mechanism is one more than the number of mobile pressing wheels 7 in the rear pressing mechanism. And the fixed pressing wheel 4 and the mobile pressing wheel 7 in the front pressing mechanism are staggered with the corresponding fixed pressing wheel 4 and the mobile pressing wheel 7 in the rear pressing mechanism. A displacement mechanism is arranged on the fixed bracket 3 to adjust the position of the mobile pressing wheel 7, and then adjust the distance between the fixed pressing wheel 4 and the adjacent mobile pressing wheel 7, and between two adjacent mobile pressing wheels 7.

[0031] like Figure 4As shown, the shift mechanism includes an inverted U-shaped mobile bracket 6, and the mobile pressing wheel 7 is rotatably installed in the opening of the mobile bracket 6. A sliding frame 5 is fixed to the side wall of the mobile bracket 6, and the sliding frame 5 on the leftmost mobile bracket 6 is slidably connected to the fixed bracket 3, and the sliding frames 5 on other mobile brackets 6 are slidably connected to the adjacent mobile bracket 6. The end surface of the mobile pressing wheel 7 has a rectangular rod 8 arranged along the axial direction, and the fixed pressing wheel 4 and the mobile pressing wheel 7 except the rightmost one are provided with a rectangular groove 9 opened along the axial direction. The rectangular rod 8 on the right mobile pressing wheel 7 extends into the rectangular groove 9 on the adjacent left mobile pressing wheel 7 to achieve sliding connection, and the rectangular rod 8 on the leftmost mobile pressing wheel 7 extends into the rectangular groove 9 on the fixed pressing wheel 4 to achieve sliding connection. An upwardly extending cylindrical rod 10 is fixedly connected to the middle position of the top of the fixed bracket 3 and the mobile bracket 6, and an upper rotating rod 12 and a lower rotating rod 11 arranged up and down are rotatably connected to the cylindrical rod 10, and the upper rotating rod 12 and the lower rotating rod 11 are arranged crosswise in an X shape. In this way, multiple groups of upper rotating rods 12 and lower rotating rods 11 are sequentially arranged, and the upper rotating rods 12 in any group are rotatably connected to the lower rotating rods 11 of the adjacent group, and the lower rotating rods 11 in any group are rotatably connected to the upper rotating rods 12 of the adjacent group, so that multiple groups of upper rotating rods 12 are linked to the lower rotating rods 11. An electric drive telescopic rod 14 is fixedly installed on the support steel frame 2, and the output end of the electric drive telescopic rod 14 has a positioning bracket 15, and a positioning column 13 is installed on the positioning bracket 15. The positioning column 13 is sleeved on the cylindrical rod 10 at the top of the mobile bracket 6 closest to the fixed bracket 3, that is, the positioning column 13 is sleeved on the cylindrical rod 10 at the top of the leftmost mobile bracket 6. According to the sowing range, when the electric drive telescopic rod 14 is actuated, the positioning bracket 15 moves in the left and right directions, thereby driving the left and right movement of the mobile bracket 6, thereby adjusting the distance between adjacent mobile brackets 6 and between the leftmost mobile bracket 6 and the fixed bracket 3. Then, the spacing between the fixed pressing wheel 4 and the left movable pressing wheel 7 and between the two adjacent movable pressing wheels 7 is adjusted, thereby realizing the adjustment of the compaction range. At this time, the upper rotating rod 12 and the lower rotating rod 11 connected to the fixed bracket 3 and the movable bracket 6 are cross-rotated. Under the rotation drive of the upper rotating rod 12 and the lower rotating rod 11, the displacement of multiple movable brackets 6 can be controlled. The movable bracket 6 drives the movable pressing wheel 7 installed thereon to move synchronously. The rectangular rod 8 on the movable pressing wheel 7 penetrates and is connected to the rectangular groove 9 of the adjacent fixed pressing wheel 4 or the movable pressing wheel 7. The rectangular rod 8 moves in a directional manner in the rectangular groove 9, so that the compaction range of the pressing mechanism can be adjusted quickly and smoothly. By providing two groups of pressing mechanisms, and the pressing wheels in the two groups of pressing mechanisms are staggered in the axial direction, that is, the fixed pressing wheel 4 of the rear pressing mechanism is located between the fixed pressing wheel 4 of the front pressing mechanism and the adjacent movable pressing wheel 7, and the movable pressing wheel 7 of the rear pressing mechanism is located between the two adjacent movable pressing wheels 7 of the front pressing mechanism.Thereby, the two groups of pressing mechanisms can roll in sequence on the surface of the farmland soil, the rolling range is consistent with the sowing range, and the range of the two roller pressings is more comprehensive, thereby improving the effect of secondary soil compaction.

[0032] Embodiment 2: Based on the embodiment 1, a leveling mechanism is also disclosed, and its specific structure is as follows: a leveling mechanism for reciprocatingly combing farmland soil is provided on the vehicle frame 1, and the leveling mechanism includes a rotating shaft 16 rotatably connected to the vehicle frame 1, a sleeve rod 17 is sleeved and installed on the outer side of the rotating shaft 16, and a plurality of rake frames 18 are fixedly connected to the sleeve rod 17 at equal intervals, a guide slide 19 is fixedly installed on the vehicle frame 1, and a guide slide seat 20 is slidably installed on the guide slide 19, and the guide slide seat 20 is fixedly connected to the outer side of the sleeve rod 17, and an arc groove 21 is provided on the outer side of the rotating shaft 16, and a slider 22 is slidably connected in the arc groove 21, and the slider 22 is fixed. Installed on the inner wall of the sleeve rod 17, the fixed pressure wheel 4 is connected with an active curved rod 23 along the axial direction, and a driven support rod 24 is fixedly connected to the outer side of the rotating shaft 16, a transmission rod 25 is rotatably connected to the driven support rod 24, and the transmission rod 25 is rotatably connected to the active curved rod 23. When the frame 1 moves on the farmland, a plurality of rake frames 18 are arranged at equal intervals outside the sleeve rod 17 on the frame 1, and the rake frames 18 move synchronously with the frame 1 on the farmland. The bottom of the rake frames 18 can contact the soil of the protruding part of the surface of the farmland, and can push and disperse the soil during the movement, so that the soil distribution on the surface of the farmland is relatively uniform, thereby improving the suppression effect.

[0033] When the frame 1 moves, it drives the fixed pressure wheel 4 to press and roll on the soil. The fixed pressure wheel 4 drives the active curved rod 23 connected to the side to rotate synchronously. At this time, the two ends of the transmission rod 25 connected between the active curved rod 23 and the driven support rod 24 rotate accordingly. The rotating transmission rod 25 can push the driven support rod 24 and the rotating shaft 16 to reciprocate according to the moving angle range. When the rotating shaft 16 rotates reciprocatingly, the sleeve rod 17 outside it follows the slider 22 to move along the direction of the arc groove 21. Under the drive of the slider 22 and the arc groove 21, the sleeve rod 17 can be controlled to reciprocate along the direction of the guide slide bar 19. The sleeve rod 17 drives multiple rake frames 18 to reciprocate synchronously laterally, so that the rake frame 18 can not only move in the direction of the frame 1, but also reciprocate along the driving direction perpendicular to the frame 1. The multi-directional moving rake frame 18 can better promote the dispersion of the soil on the surface of the farmland, making the soil distribution more even and convenient for compaction.

[0034] According to actual needs, a sowing mechanism can be installed between the two sets of suppressing mechanisms. In this way, the front suppressing mechanism performs a first suppression before sowing, and the rear suppressing mechanism performs a second suppression after sowing. A fertilizing mechanism can also be installed between the two sets of suppressing mechanisms, so that fertilization is performed after the first suppression, and a second suppression is performed after fertilization. Alternatively, a fertilizing mechanism can be installed on the frame in front of the front suppressing mechanism, so that a second suppression is performed after fertilization.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A soil secondary compaction device for agricultural sowing with an adjustable compaction range, comprising a frame (1), characterized in that: A supporting steel frame (2) is welded and fixed to the frame (1), and two groups of front and rear suppressing mechanisms are arranged on the supporting steel frame (2); the suppressing mechanism comprises a fixed bracket (3) fixed to the supporting steel frame (2), and a fixed pressing wheel (4) is rotatably connected to the fixed bracket (3), and a plurality of movable pressing wheels (7) arranged in sequence along the axial direction are arranged on one side of the fixed pressing wheel (4); the suppressing mechanism close to the side of the frame (1) is a front suppressing mechanism, and the number of movable pressing wheels (7) of the suppressing mechanism on the front side is one more than the number of movable pressing wheels (7) in the suppressing mechanism on the rear side, and the fixed pressing wheel (4) and the movable pressing wheel (7) of the suppressing mechanism on the front side are staggered with the corresponding fixed pressing wheels (4) and the movable pressing wheels (7) in the suppressing mechanism on the rear side; The fixed bracket (3) is provided with a displacement mechanism for adjusting the position of the movable pressing wheel (7) of the pressing mechanism, thereby adjusting the distance between the fixed pressing wheel (4) and the movable pressing wheel (7), and between two adjacent movable pressing wheels (7).

2. The secondary soil compaction device for agricultural sowing with adjustable compaction range according to claim 1, characterized in that: The displacement mechanism comprises a movable bracket (6), the movable pressure wheel (7) is rotatably mounted on the corresponding movable bracket (6), a sliding bracket (5) is fixed on the movable bracket (6), the sliding bracket (5) on the movable bracket (6) close to the fixed bracket (3) is slidably connected to the fixed bracket (3), and the sliding brackets (5) on other movable brackets (6) are slidably connected to adjacent movable brackets (6).

3. The secondary soil compaction device for agricultural sowing with adjustable compaction range according to claim 2, characterized in that: A rectangular rod (8) arranged along the axial direction is fixed to the end of the movable pressing wheel (7), and the rectangular rod (8) is slidably connected to an adjacent movable pressing wheel (7) or a fixed pressing wheel (4).

4. The secondary soil compaction device for agricultural sowing with adjustable compaction range according to claim 2, characterized in that: A cylindrical rod (10) is fixedly connected to the middle position of the top of the fixed bracket (3) and the movable bracket (6), and each of the cylindrical rods (10) is rotatably connected to an upper rotating rod (12) and a lower rotating rod (11) arranged crosswise up and down; the upper rotating rods (12) and the lower rotating rods (11) are arranged in sequence in a plurality of groups, and the upper rotating rods (12) of any group are rotatably connected to the ends of the lower rotating rods (11) of the adjacent group, and the lower rotating rods (11) of any group are rotatably connected to the ends of the upper rotating rods (12) of the adjacent group.

5. The secondary soil compaction device for agricultural sowing with adjustable compaction range according to claim 4, characterized in that: An electric-driven telescopic rod (14) is fixedly mounted on the supporting steel frame (2); an output end of the electric-driven telescopic rod (14) has a positioning bracket (15); a positioning column (13) is mounted on the positioning bracket (15); and the positioning column (13) is sleeved on a cylindrical rod (10) at the top of a movable bracket (6) close to the fixed bracket (3).

6. The secondary soil compaction device for agricultural sowing with adjustable compaction range according to claim 1, characterized in that: The frame (1) is provided with a leveling mechanism for reciprocatingly combing farmland soil.

7. The secondary soil compaction device for agricultural sowing with adjustable compaction range according to claim 6, characterized in that: The leveling mechanism comprises a rotating shaft (16) rotatably connected to the vehicle frame (1), a sleeve rod (17) being sleeved and mounted on the outside of the rotating shaft (16), and a plurality of rake frames (18) being fixedly connected to the sleeve rod (17) at equal intervals.

8. The secondary soil compaction device for agricultural sowing with adjustable compaction range according to claim 7, characterized in that: A guide slide bar (19) is fixedly mounted on the vehicle frame (1), a guide slide seat (20) is slidably mounted on the guide slide bar (19), and the guide slide seat (20) is fixedly connected to the outer side surface of the sleeve rod (17).

9. The agricultural sowing soil secondary compaction device with adjustable compaction range according to claim 8, characterized in that: An arc-shaped groove (21) is formed on the outside of the rotating shaft (16), a sliding block (22) is slidably connected in the arc-shaped groove (21), and the sliding block (22) is fixedly mounted on the inner side wall of the sleeve rod (17).

10. The agricultural soil secondary compaction device with adjustable compaction range for sowing according to claim 9, characterized in that: The end of the fixed pressure wheel (4) has an active curved rod (23) arranged along the axial direction of the fixed pressure wheel (4), a driven support rod (24) is fixedly connected to the rotating shaft (16), a transmission rod (25) is rotatably connected to the driven support rod (24), and the transmission rod (25) is rotatably connected to the active curved rod (23).

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