Soil loosening equipment for improving soil

By designing an aeration and sowing mechanism and a rotating locking mechanism, the problems of uneven soil aeration and sowing, and loose components in existing soil loosening equipment have been solved. This has improved soil permeability and seed germination rate, made the equipment adaptable to different soil types, and increased sowing efficiency and ease of operation.

CN223568046UActive Publication Date: 2025-11-21ONE MU OF THREE-PART FIELD (LONGYAO) ECOLOGICAL FAMILY FARM
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Patent Information

Application Number
CN202423201818.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-11-21
Estimated Expiration
2034-12-24

AI Technical Summary

Technical Problem

Existing soil loosening equipment cannot achieve soil aeration and uniform seed sowing. The sowing components are prone to loosening or falling off, making operation difficult. It lacks automation mechanisms, which affects the sowing and soil loosening effect and makes it difficult to adapt to different soil types and sowing needs.

Method used

An aeration and seeding mechanism, a rotating locking mechanism, and a locking auxiliary mechanism were designed, including an aeration box, a seeding box assembly, a rotating locking mechanism, and a locking auxiliary mechanism. Air is delivered through the aeration pipe, and the seeding pipe is used for uniform seeding. The rotating locking mechanism ensures a stable connection of the seeding pipe, and the locking auxiliary mechanism enhances stability and ease of operation.

Benefits of technology

It improves soil permeability and seed germination rate, achieves uniform and stable sowing, adapts to different soil types, reduces operational difficulty and manual intervention, and improves sowing efficiency and product quality.

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Abstract

The utility model discloses soil loosening equipment for improving soil, which comprises a frame, an aeration seeding mechanism, a rotary clamping mechanism and a clamping auxiliary mechanism, the aeration seeding mechanism comprises an aeration box, a seeding box component, a transverse frame, a rotating shaft, an aeration pipe and a seeding pipe, the rotating clamping mechanism comprises a rotating plate, a clamping pipe, a pressing rod, a clamping groove, a locking frame, a rotating ring, a radian plate and a radian groove, the clamping auxiliary mechanism comprises a matching ring, an elastic lifting pin, a top groove, a pushing ring, a top grinding wheel and a bottom grinding wheel, the aeration box conveys air into soil through the aeration pipe, the air permeability of the soil is improved, respiration and growth of plant roots are facilitated, and the soil is protected. The connection design of the rotating plate and the clamping pipe ensures the stable connection of the seeding pipe, the loosening or falling in the operation process is prevented, the design of the matching ring, the elastic lifting pin and the top groove enhances the stability of the rotating ring, and the stable connection of the seeding box assembly is ensured.
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Description

Technical Field

[0001] This utility model relates to the field of soil loosening technology, and more specifically, to a soil loosening device for improving soil quality. Background Technology

[0002] A soil loosening device is a mechanical device specifically designed for agricultural cultivation to improve soil structure, enhance soil aeration and water retention capacity.

[0003] In existing technologies, firstly, some devices cannot achieve soil aeration and seed sowing, affecting soil permeability and seed germination rate, and cannot achieve uniform seed sowing, reducing sowing efficiency. They cannot adapt to different soil types and sowing needs, limiting the scope of equipment application. Secondly, some devices cannot stably connect the sowing tube to the equipment, affecting sowing operations. They cannot adjust the position and angle of the sowing box components, increasing the difficulty of operation. The lack of a locking mechanism for fixing means that the sowing components may loosen or fall off during operation, affecting the sowing and soil loosening effects. Finally, some devices require more manual intervention and professional skills, and cannot ensure the uniformity and stability of sowing and soil loosening, leading to fluctuations in product quality. The lack of automation mechanisms may require more manpower and energy to complete the sowing work. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a soil loosening device to improve the soil, thereby solving the technical problems mentioned in the background art, such as the inability to achieve soil aeration and seed sowing, and the possibility of loosening or falling off of the sowing components during operation.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a soil loosening device for improving soil quality, comprising a frame, an aeration and sowing mechanism, a rotating locking mechanism, and a locking auxiliary mechanism. The aeration and sowing mechanism includes an aeration box, a sowing box assembly, a horizontal frame, a rotating shaft, an aeration pipe, and a sowing pipe. The aeration box is installed at the top of the frame, the horizontal frame is horizontally installed on the side of the aeration box, the rotating shaft is installed at the bottom of the sowing box assembly, and the rotating shaft is rotatably installed on the side of the horizontal frame. The aeration pipe and the sowing pipe are respectively installed on the aeration box and the sowing box assembly. The rotating locking mechanism includes a rotating plate, a locking pipe, a pressing rod, a locking groove, a locking frame, a rotating ring, an arc plate, and an arc groove. The locking pipe is fixedly installed on the rotating plate, the pressing rod can extend into the locking pipe, the locking groove is provided on the side of the pressing rod, the locking frame is laterally slidably installed through the side wall of the locking pipe, the rotating ring is rotatably installed on the outer wall of the locking pipe, the arc plate is installed at one end of the locking frame, the arc groove is provided inside the rotating ring, and the arc plate is rotatably installed in the arc groove.

[0008] The present invention is further configured such that the snap-fit ​​auxiliary mechanism includes a mating ring, a spring-loaded pin, a top groove, a push ring, a top grinding wheel, and a bottom grinding wheel. The mating ring is fixedly installed on the bottom end of the outer wall of the snap-fit ​​tube. Multiple sets of spring-loaded pins are longitudinally slidably arranged on the mating ring. The top groove is arranged at the bottom of the rotating ring. One end of the spring-loaded pin extends into the top groove to cooperate and support the rotation. The bottom grinding wheel is installed on the top of the rotating ring. The push ring is threadedly connected to the outer wall of the snap-fit ​​tube. The top grinding wheel is installed at the bottom of the push ring. The top grinding wheel presses against the bottom grinding wheel to fix the rotating ring on the outer wall of the snap-fit ​​tube.

[0009] The present invention is further configured such that a soil loosening frame is installed at the bottom of the frame, and an installation block is installed on the side of the soil loosening frame. One end of the outlet of the aeration pipe and the seeding pipe is installed through the installation block. The soil loosening frame is installed at the bottom of the frame for soil loosening operations, and the installation block is installed on the side of the soil loosening frame for fixing the outlet of the aeration pipe and the seeding pipe.

[0010] The present invention is further configured such that the rotating plate has a snap-fit ​​hole, and multiple sets of snap-fit ​​holes are provided. A connecting plate is installed at the bottom of the side wall of the snap-fit ​​tube, and the connecting plate is fixedly installed at the outer end of the snap-fit ​​hole, so that the snap-fit ​​hole communicates with the snap-fit ​​tube. The snap-fit ​​hole is provided on the rotating plate for connecting the snap-fit ​​tube and realizing snap-fit ​​at different positions.

[0011] The present invention is further configured such that a pressing block is installed at one end of the pressing rod, and a tension spring is installed at one end of the pressing block, so that the pressing block presses against the pressing rod, causing the pressing rod to extend into the interior of the retaining tube.

[0012] The present invention is further configured such that the other end of the tension spring is connected to one end of the transverse frame, and when the locking is released, the tension spring will press the rod away from the locking tube.

[0013] The present invention is further configured such that a bottom block is installed at the bottom of the seeding box assembly, and the side of the bottom block is rotatably connected to one end of the rotating plate. The bottom block is installed at the bottom of the seeding box assembly and is rotatably connected to the rotating plate to support the seeding box assembly.

[0014] The present invention is further configured such that a connecting frame is installed on the side of the frame and the connecting frame is installed with an external drive component, and wheels are symmetrically installed on the bottom of the frame. The connecting frame is installed on the side of the frame and connected with the external drive component for driving the equipment to operate.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a soil loosening device for improving soil quality, which has the following beneficial effects:

[0017] This invention features an aeration and sowing mechanism. The aeration box delivers air to the soil through the aeration pipe, increasing soil permeability and promoting root respiration and growth. The sowing box assembly evenly sows seeds into the soil through the sowing pipe, improving sowing efficiency and seed germination rate. The design of the horizontal frame and rotating shaft allows the sowing box assembly to be flexibly adjusted in position and angle to adapt to different soil types and sowing needs.

[0018] This utility model is equipped with a rotating snap-fit ​​mechanism. The connection design of the rotating plate and the snap-fit ​​tube ensures a stable connection of the seeding tube and prevents it from loosening or falling off during operation. The design of the rotating ring and the arc plate allows the position and angle of the seeding tube to be precisely adjusted, improving seeding accuracy. The design of the pressing rod and the slot allows the operator to easily connect and adjust the seeding box components, improving operating efficiency.

[0019] This utility model features a snap-fit ​​auxiliary mechanism. The design of the ring, spring-loaded pin, and top groove enhances the stability of the rotating ring, ensuring a stable connection of the seed box assembly. The design of the push ring, top grinding wheel, and bottom grinding wheel allows the rotating ring to be precisely fixed on the outer wall of the snap-fit ​​tube, preventing displacement during operation. The snap-fit ​​auxiliary mechanism also allows operators to easily adjust the position and angle of the seed tube, improving operational efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the device in the unused state of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of part of the aeration seeding mechanism in this utility model;

[0022] Figure 3 This is a structural schematic diagram of the connection method of the seed box assembly in this utility model;

[0023] Figure 4 This is a schematic diagram of the rotating locking mechanism and the locking auxiliary mechanism in this utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the rotating locking mechanism and the locking auxiliary mechanism in this utility model.

[0025] In the diagram: 1. Frame; 2. Aeration box; 3. Seeding box assembly; 4. Horizontal frame; 5. Rotating shaft; 6. Aeration pipe; 7. Seeding pipe; 8. Rotating plate; 9. Clip-on pipe; 10. Pressing rod; 11. Clip groove; 12. Locking frame; 13. Rotating ring; 14. Curved plate; 15. Curved groove; 16. Matching ring; 17. Top pin; 18. Top groove; 19. Push ring; 20. Top grinding wheel; 21. Bottom grinding wheel; 22. Soil loosening frame; 23. Mounting block; 24. Clip-on hole; 25. Connecting plate; 26. Pressing block; 27. Tension spring; 28. Bottom block; 29. ​​Connecting frame; 30. Wheel. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figure 1-5 A soil loosening device for improving soil quality includes a frame 1, an aeration and seeding mechanism, a rotating locking mechanism, and a locking auxiliary mechanism. The aeration and seeding mechanism includes an aeration box 2, a seeding box assembly 3, a horizontal frame 4, a rotating shaft 5, an aeration pipe 6, and a seeding pipe 7. The aeration box 2 is installed at the top of the frame 1, the horizontal frame 4 is horizontally installed on the side of the aeration box 2, the rotating shaft 5 is installed at the bottom of the seeding box assembly 3, and the rotating shaft 5 is rotatably installed on the side of the horizontal frame 4. The aeration pipe 6 and the seeding pipe 7 are respectively installed on the aeration box 2 and the seeding box assembly 3. The rotating locking mechanism includes a rotating plate 8. The components include a retaining tube 9, a pressing rod 10, a retaining groove 11, a locking frame 12, a rotating ring 13, an arc plate 14, and an arc groove 15. The retaining tube 9 is fixedly installed on the rotating plate 8. The pressing rod 10 can extend into the retaining tube 9. The retaining groove 11 is located on the side of the pressing rod 10. The locking frame 12 is laterally slidably installed through the side wall of the retaining tube 9. The rotating ring 13 is rotatably installed on the outer wall of the retaining tube 9. The arc plate 14 is installed at one end of the locking frame 12. The arc groove 15 is located inside the rotating ring 13 and is rotatably installed within the arc groove 15.

[0030] In this embodiment, when the equipment is moved to the area where soil loosening and sowing are required, the operator starts the equipment. The rotating shaft 5 inside the aeration box 2 drives the aeration pipe 6 to rotate through the horizontal frame 4. The air in the aeration pipe 6 is pumped into the soil to achieve soil aeration. At the same time, the sowing pipe 7 in the sowing box assembly 3 sows the seeds evenly into the soil through the rotation of the rotating shaft 5. The aeration and sowing processes can be carried out simultaneously to improve soil permeability and seed germination rate, and to achieve quick installation of the sowing box assembly 3 and the rotating plate 8. It is also convenient to adjust the tilt of the sowing box assembly 3 and facilitate seed exit. The operator presses the pressing block 26 against the pressing rod 10 to insert the locking pipe 9, so that the pressing rod 10 extends into the inside of the locking pipe 9 to achieve locking. When it is necessary to adjust the position of the sowing pipe 7 or replace the sowing pipe 7, the operator can release the locking. The tension spring 27 moves the pressing rod 10 away from the locking pipe 9, thereby releasing the locking pipe 9.

[0031] The locking auxiliary mechanism includes a mating ring 16, a spring pin 17, a top groove 18, a push ring 19, a top grinding wheel 20, and a bottom grinding wheel 21. The mating ring 16 is fixedly installed on the bottom of the outer wall of the locking tube 9. Multiple sets of spring pins 17 are longitudinally slidably arranged on the mating ring 16. The top groove 18 is located at the bottom of the rotating ring 13. One end of the spring pin 17 extends into the top groove 18 to cooperate and support rotation. The bottom grinding wheel 21 is installed on the top of the rotating ring 13. The push ring 19 is threadedly connected to the outer wall of the locking tube 9. The top grinding wheel 20 is installed at the bottom of the push ring 19. The top grinding wheel 20 presses against the bottom grinding wheel 21 to fix the rotating ring 13 on the outer wall of the locking tube 9.

[0032] In this embodiment, the mating ring 16 is fixed to the bottom of the outer wall of the snap-fit ​​tube 9, and the spring pin 17 is longitudinally slidably disposed on the mating ring 16. One end of the spring pin 17 extends into the top groove 18 to support rotation, making it easy for the operator to rotate the rotating ring 13 stably. The arc groove 15 drives the arc plate 14 to move the locking frame 12 away from or into the snap-fit ​​groove 11. The bottom grinding wheel 21 is installed on the top of the rotating ring 13, the push ring 19 is threadedly connected to the outer wall of the snap-fit ​​tube 9, and the top grinding wheel 20 is installed at the bottom of the push ring 19. When the top grinding wheel 20 presses against the bottom grinding wheel 21, the rotating ring 13 is fixed to the outer wall of the snap-fit ​​tube 9, ensuring the stability of the snap-fit.

[0033] Please see Figures 1-5As a supplementary implementation method for a soil loosening device that improves soil quality, including an aeration and sowing mechanism, a rotating clamping mechanism, and a clamping auxiliary mechanism: A soil loosening frame 22 is installed at the bottom of the frame 1, and an installation block 23 is installed on the side of the soil loosening frame 22. One end of the outlet of the aeration pipe 6 and the sowing pipe 7 is installed through the installation block 23. A clamping hole 24 is opened on the rotating plate 8, and multiple sets of clamping holes 24 are provided. A connecting plate 25 is installed at the bottom of the side wall of the clamping pipe 9, and the connecting plate 25 is fixedly installed on the outer end of the clamping hole 24, so that the clamping hole 24 communicates with the clamping pipe 9. One end of the pressing rod 10 is installed... A pressing block 26 is installed, and a tension spring 27 is installed at one end of the pressing block 26. The pressing block 26 presses against the pressing rod 10, causing the pressing rod 10 to extend into the inside of the clamping tube 9. The other end of the tension spring 27 is connected to one end of the transverse frame 4. When the clamping is released, the tension spring 27 moves the pressing rod 10 away from the clamping tube 9. A bottom block 28 is installed at the bottom of the seeding box assembly 3, and the side of the bottom block 28 is rotatably connected to one end of the rotating plate 8. A connecting frame 29 is installed on the side of the frame 1, and the connecting frame 29 is installed with the external drive assembly. Wheels 30 are symmetrically installed at the bottom of the frame 1.

[0034] More specifically, move the soil loosening equipment to the area where the soil needs to be treated, ensure that the aeration and sowing mechanism, the rotating clamping mechanism, and the clamping auxiliary mechanism are in a ready state, start the equipment, and the aeration and sowing mechanism starts working. At the same time, the soil loosening frame 22 moves on the soil via the wheels 30, and the aeration and sowing processes are carried out simultaneously. The operator can adjust the position of the sowing tube 7 as needed. By rotating the clamping mechanism and the clamping auxiliary mechanism, the tilt angle of the sowing component can be easily adjusted. When the soil loosening and sowing work is completed, stop the equipment, check the sowing effect and the soil aeration status, and ensure the quality of the work.

[0035] In summary, when the overall equipment is in use or running: when the aeration and sowing mechanism needs to be operated, when the equipment is moved to an area where soil loosening and sowing are required, the operator starts the equipment. The rotating shaft 5 in the aeration box 2 drives the aeration pipe 6 to rotate through the horizontal frame 4. The air in the aeration pipe 6 is pumped into the soil to achieve soil aeration. At the same time, the sowing pipe 7 in the sowing box assembly 3 sows the seeds evenly into the soil through the rotation of the rotating shaft 5. The aeration and sowing processes can be carried out simultaneously to improve soil permeability and seed germination rate.

[0036] When the locking mechanism needs to be rotated, the seed box assembly 3 and the rotating plate 8 can be quickly installed, making it easy to adjust the tilt of the seed box assembly 3 and facilitate seed discharge. The operator presses the pressing block 26 against the pressing rod 10 to insert into the locking tube 9, so that the pressing rod 10 extends into the inside of the locking tube 9 to achieve locking. When it is necessary to adjust the position of the seed tube 7 or replace the seed tube 7, the operator can release the locking. The tension spring 27 moves the pressing rod 10 away from the locking tube 9, thereby releasing the locking tube 9.

[0037] When the locking auxiliary mechanism is in operation, the mating ring 16 is fixed to the bottom of the outer wall of the locking tube 9, and the spring pin 17 is longitudinally slidably set on the mating ring 16. One end of the spring pin 17 extends into the top groove 18 to support the rotation, making it easy for the operator to rotate the rotating ring 13 stably. The arc groove 15 drives the arc plate 14 to make the locking frame 12 move away from or into the locking groove 11. The bottom grinding wheel 21 is installed on the top of the rotating ring 13, the push ring 19 is threaded to the outer wall of the locking tube 9, and the top grinding wheel 20 is installed at the bottom of the push ring 19. When the top grinding wheel 20 presses against the bottom grinding wheel 21, the rotating ring 13 is fixed to the outer wall of the locking tube 9, ensuring the stability of the locking.

[0038] Move the soil loosening equipment to the area where the soil needs to be treated, and ensure that the aeration and sowing mechanism, the rotating clamping mechanism, and the clamping auxiliary mechanism are in a ready state. Start the equipment, and the aeration and sowing mechanism will begin to work. At the same time, the soil loosening frame 22 moves on the soil via the wheels 30. The aeration and sowing processes are carried out simultaneously. The operator can adjust the position of the sowing tube 7 as needed. By rotating the clamping mechanism and the clamping auxiliary mechanism, the tilt angle of the sowing component can be easily adjusted. When the soil loosening and sowing work is completed, stop the equipment, check the sowing effect and the soil aeration status, and ensure the quality of the work.

[0039] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. An improved soil loosening apparatus for improving soil, comprising a frame (1), an aeration and seeding mechanism, a swivel joint mechanism and a joint auxiliary mechanism, characterized in that: The aeration seeding mechanism comprises an aeration box (2), a seeding box assembly (3), a transverse frame (4), a rotating shaft (5), an aeration pipe (6) and a seeding pipe (7), the transverse frame (4) is transversely arranged on the side of the aeration box (2), the rotating shaft (5) is arranged on the bottom of the seeding box assembly (3), the rotating shaft (5) is rotatably arranged on the side of the transverse frame (4), the aeration pipe (6) and the seeding pipe (7) are respectively arranged on the aeration box (2) and the seeding box assembly (3), the rotating clamping mechanism comprises a rotating plate (8), a clamping pipe (9), a pressing rod (10), a clamping groove (11), a locking frame (12), a rotating ring (13), an arc plate (14) and an arc groove (15), the clamping pipe (9) is fixedly arranged on the rotating plate (8), the pressing rod (10) can be inserted into the clamping pipe (9), the clamping groove (11) is arranged on the side of the pressing rod (10), the locking frame (12) is transversely and slidingly arranged on the side wall of the clamping pipe (9), the rotating ring (13) is limitingly and rotatably arranged on the outer wall of the clamping pipe (9), the arc plate (14) is arranged on one end of the locking frame (12), and the arc groove (15) is arranged in the rotating ring (13).

2. An improved soil loosening apparatus as claimed in claim 1, wherein: The clamping auxiliary mechanism comprises a matching ring (16), a spring pin (17), a top groove (18), a pushing ring (19), a top grinding wheel (20) and a bottom grinding wheel (21), the matching ring (16) is fixedly arranged on the bottom end of the outer wall of the clamping pipe (9), a plurality of spring pins (17) are longitudinally and slidingly arranged on the matching ring (16), the top groove (18) is arranged on the bottom of the rotating ring (13), one end of the spring pin (17) is inserted into the top groove (18) to rotatably support, the bottom grinding wheel (21) is arranged on the top of the rotating ring (13), the pushing ring (19) is threadedly connected to the outer wall of the clamping pipe (9), the top grinding wheel (20) is arranged on the bottom of the pushing ring (19), and the top grinding wheel (20) is pressed towards the bottom grinding wheel (21) to fix the rotating ring (13) on the outer wall of the clamping pipe (9).

3. An improved soil loosening apparatus as claimed in claim 1, wherein: A soil loosening frame (22) is arranged on the bottom of the frame (1), an installation block (23) is arranged on the side of the soil loosening frame (22), and the outlet ends of the aeration pipe (6) and the seeding pipe (7) are arranged on the installation block (23).

4. An improved soil loosening apparatus as claimed in claim 1, wherein: A clamping hole (24) is arranged on the rotating plate (8), a plurality of clamping holes (24) are arranged, a connecting plate (25) is arranged on the bottom end of the side wall of the clamping pipe (9), and the connecting plate (25) is fixedly arranged on the outer end of the clamping hole (24) to communicate the clamping hole (24) with the clamping pipe (9).

5. An improved soil loosening apparatus as claimed in claim 1, wherein: A pressing block (26) is arranged on one end of the pressing rod (10), a tension spring (27) is arranged on one end of the pressing block (26), the pressing block (26) is pressed towards the pressing rod (10), and the pressing rod (10) is inserted into the clamping pipe (9).

6. An improved soil loosening apparatus according to claim 5, wherein: The other end of the tension spring (27) is connected with one end of the transverse frame (4), when the clamping is released, the tension spring (27) moves the pressing rod (10) away from the clamping pipe (9).

7. An improved soil loosening apparatus as claimed in claim 1, wherein: A bottom block (28) is arranged on the bottom of the seeding box assembly (3), and one end of the bottom block (28) is rotatably connected with the rotating plate (8).

8. An improved soil loosening apparatus as claimed in claim 1, wherein: The side of the frame (1) is provided with a connecting frame (29), and the connecting frame (29) is installed with an external driving assembly; the bottom of the frame (1) is symmetrically provided with wheels (30).