Greenhouse inner field furrow grooving equipment for strawberry planting

By designing an adjustable field grooved equipment for greenhouses for strawberry planting, the problem of the inability to adjust the distance between the digger and the wheel in the prior art has been solved, and the diggering operation adapted to strawberry seedlings is achieved, ensuring the safety and efficiency of the digger process.

CN120113402AInactive Publication Date: 2025-06-10诸城市华邦机械有限公司
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Patent Information

Application Number
CN202510462314.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-14
Publication Date
2025-06-10
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing trenching facilities cannot adjust the distance between the trenching knife and the wheel, which causes the wheels to easily crush the strawberry seedlings when planting strawberry seedlings of different spacings, causing damage.

Method used

A kind of field groove groove equipment for greenhouses for strawberry planting is designed, using an adjustable rotation shaft and adjustment shaft structure. The adjustment shaft slides by rotating the threaded rod, adjusting the extension position of the groove cutting knife, adapting to strawberry seedlings of different spacings, and adjusting the distance of the wheels through the servo motor and the synchronization belt system to ensure that the wheels do not crush the strawberry seedlings.

Benefits of technology

It effectively avoids the damage caused by wheel crushing during the trenching process, ensures the safety and efficiency of the trenching process, and at the same time adapts to the planting needs of strawberry seedlings at different spacings.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the field of ditching facilities, in particular to greenhouse field ditching equipment for strawberry planting, which comprises a frame, a lifting frame is mounted at the front part of the frame, a rotating shaft is rotatably mounted at the lower end of the lifting frame in a penetrating manner, and an adjusting shaft is mounted in the rotating shaft in a fitting manner; the two ends of the adjusting shaft penetrate out of the two ends of the rotating shaft, a ditching piece is installed at one end of the adjusting shaft, a bearing frame is fixedly installed at one end of the rotating shaft, a threaded rod is screwed to the side face of the bearing frame in a penetrating mode, the end of the threaded rod is rotationally connected with the other end of the adjusting shaft, and a protruding edge extends from the outer surface of the adjusting shaft. The protruding edges penetrate through the inner surface of the rotating shaft, and a moving part is installed at the lower end of the frame. According to the invention, strawberry seedlings cannot be damaged in the ditching process, and meanwhile, the ditching quality is also ensured.
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Description

Technical Field

[0001] The invention relates to the field of trenching facilities, and in particular to a field trenching device in a greenhouse for strawberry planting. Background Art

[0002] Strawberry is a red fruit, a perennial herb belonging to the genus Fragaria in the Rosaceae family. It is usually heart-shaped, fresh and tender, with juicy flesh and a special rich fruity aroma. Strawberries have a variety of edible methods and a wide range of application values.

[0003] During the process of growing strawberries in greenhouses, trenching operations are often performed. Trenching machines are agricultural machinery commonly used in greenhouse cultivation. Their purpose is to provide a good growing environment for strawberries, including suitable soil structure, drainage conditions, and convenient irrigation. By trenching, the soil structure can be optimized, the air permeability and water retention of the soil can be improved, while drainage and irrigation can be facilitated, and the incidence of pests and diseases can be reduced. However, the existing trenching facilities cannot be adjusted because the distance between the trenching knife and the wheel is constant. As a result, when trenching the planting sites of strawberry seedlings with different spacings, the wheels will crush the strawberry seedlings, causing damage to the strawberry seedlings. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a field ditch grooving device for strawberry planting in a greenhouse.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a field ditch grooving equipment in a greenhouse for strawberry planting, including a frame, a lifting frame is installed at the front of the frame, a rotating shaft is rotatably installed through the lower end of the lifting frame, an adjusting shaft is fitted inside the rotating shaft, two ends of the adjusting shaft pass through the two ends of the rotating shaft, a ditching piece is installed at one end of the adjusting shaft, a supporting frame is fixedly installed at one end of the rotating shaft, a threaded rod is screwed through the side of the supporting frame, the end of the threaded rod is rotatably connected to the other end of the adjusting shaft, a convex ridge is extended from the outer surface of the adjusting shaft, and the convex ridge passes through the inner surface of the rotating shaft, and a moving part is installed at the lower end of the frame.

[0006] Preferably, guide pillars are fixedly installed at both side edges of the upper end of the lifting frame, guide sleeves are fitted on the outer surfaces of the guide pillars, the guide sleeves are fixed on the frame, a servo push cylinder is fixedly installed on the rear of the frame, a connecting ear is fixedly installed on the output end of the servo push cylinder, and the end of the connecting ear is fixed to the lifting frame.

[0007] Preferably, a driving motor is fixedly installed in the middle of the upper end of the lifting frame. A second synchronous belt is connected between the output end of the driving motor and the rotating shaft. A rib groove is formed on the inner surface of the rotating shaft, and the convex rib fits inside the rib groove. A battery is installed inside the vehicle frame.

[0008] Preferably, the ditching member includes a ditching knife coaxially and fixedly installed at one end of the adjusting shaft. A housing is sleeved outside the ditching knife. A housing frame is fixedly installed on the side surface of the housing. The end of the housing frame is rotatably connected to the adjusting shaft. A square rod is fixedly installed on the side surface of the housing frame. A square sleeve is fitted on the outer surface of the square rod, and the square sleeve penetrates and is embedded in the lifting frame.

[0009] Preferably, the moving member includes a wheel shaft rotatably installed at the front part of the lower end of the vehicle frame. An adjusting sleeve is fitted on the outer surface of the wheel shaft. Front wheels are coaxially and fixedly installed on the outer surface of the adjusting sleeve and one end of the wheel shaft respectively. A servo motor is arranged above the wheel shaft, and the servo motor is connected to the vehicle frame.

[0010] Preferably, a limiting groove is formed on the outer surface of the wheel shaft. A limiting block extends from the inner surface of the adjusting sleeve, and the limiting block fits inside the limiting groove. A second fixing bolt penetrates and is screwed on the outer surface of the adjusting sleeve and the front end of the limiting block, and the second fixing bolt presses against the bottom of the limiting groove. A motor frame is fixedly installed at the upper end of the servo motor, and the end of the motor frame is fixed to the vehicle frame. A first synchronous belt is connected between the output end of the servo motor and the wheel shaft.

[0011] Preferably, a T-shaped groove is formed at the rear part of the lower end of the vehicle frame. A T-shaped seat is fitted inside the T-shaped groove. Bearing shafts are fixedly installed at one side of the lower end of the T-shaped seat and the rear part of the lower end of the vehicle frame respectively. A bearing sleeve is coaxially and rotatably installed at the lower end of the bearing shaft. A rear wheel is installed at the end of the bearing sleeve. A first fixing bolt penetrates and is screwed on the other side of the lower end of the T-shaped seat, and the first fixing bolt presses against the inner top surface of the T-shaped groove.

[0012] Preferably, a protruding seat is fixedly installed at the upper edge of the outer surface of the bearing sleeve. A rotation blocking pin penetrates and is slidably installed at the end of the protruding seat. A pin hole is formed on the outer surface of the bearing shaft, and the end of the rotation blocking pin fits inside the pin hole. A fixing ring is coaxially embedded on the outer surface of the rotation blocking pin. Two magnetic rings are symmetrically embedded inside the protruding seat, and the rotation blocking pin passes through the inside of the magnetic rings. The fixing ring is adsorbed to one of the magnetic rings.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. By rotating the threaded rod, the adjusting shaft can be driven to slide in the rotating shaft to adjust the protruding position of the ditching knife, that is, to adjust the position of the ditching knife relative to the wheels, so as to adapt to strawberry seedlings with different spacings. During the ditching process, the wheels will not crush the strawberry seedlings, ensuring that the strawberry seedlings are not damaged during the ditching process. At the same time, the second fixing bolt can be loosened so that the fixed adjusting sleeve can slide on the surface of the wheel axle to drive one of the front wheels to move and adjust the spacing between the two front wheels. Similarly, by loosening the first fixing bolt, the fixed T-shaped seat can slide in the T-shaped groove to drive one of the rear wheels to move and adjust the spacing between the two rear wheels, enabling the spacing between the two side wheels to adapt to strawberry seedlings with different spacings. When the frame moves forward, the two side wheels can roll on the ground without crushing the strawberry seedlings, further ensuring that the strawberry seedlings are not damaged during the ditching process.

[0015] 2. By pushing the anti-rotation pin, the anti-rotation pin can be inserted into the pin hole on the bearing shaft. At this time, the fixing ring and the magnetic ring are adsorbed to fix the inserted anti-rotation pin, so that the bearing sleeve and the bearing shaft can be fixed together under the action of the anti-rotation pin, preventing the rear wheel from turning. This ensures that the ditching knife can ditch in a straight line during the ditching process, guaranteeing the ditching quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a device for ditching in a greenhouse for strawberry planting according to the present invention;

[0017] Figure 2 is a schematic diagram of another perspective of a device for ditching in a greenhouse for strawberry planting according to the present invention;

[0018] Figure 3 is a Figure 1 magnified view of A in a device for ditching in a greenhouse for strawberry planting according to the present invention;

[0019] Figure 4 is a schematic diagram of the bearing shaft part of a device for ditching in a greenhouse for strawberry planting according to the present invention;

[0020] Figure 5 is a Figure 4 magnified view of B in a device for ditching in a greenhouse for strawberry planting according to the present invention;

[0021] Figure 6 is a schematic diagram of the lifting frame part of a device for ditching in a greenhouse for strawberry planting according to the present invention;

[0022] Figure 7 is a Figure 6 magnified view of C in a device for ditching in a greenhouse for strawberry planting according to the present invention.

[0023] In the figure: 1, frame; 2, driving motor; 3, motor frame; 4, servo motor; 5, housing; 6, first synchronous belt; 7, wheel axle; 8, front wheel; 9, servo push cylinder; 10, rib groove; 11, battery; 12, bearing shaft; 13, bearing sleeve; 14, ditch opening knife; 15, guide post; 16, guide sleeve; 17, lifting frame; 18, rear wheel; 19, first fixing bolt; 20, T-shaped seat; 21, T-shaped groove; 22, protruding seat; 23, rotation blocking pin; 24, magnetic ring; 25, fixing ring; 26, pin hole; 27, limiting groove; 28, limiting block; 29, second fixing bolt; 30, adjusting sleeve; 31, housing frame; 32, square rod; 33, square sleeve; 34, second synchronous belt; 35, rotating shaft; 36, adjusting shaft; 37, bearing frame; 38, threaded rod; 39, convex rib; 40, connecting ear. Specific implementation mode

[0024] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0025] As Figures 1-7 shown, a ditch opening device for strawberry planting in a greenhouse includes a frame 1. An outer shell can be covered outside the frame 1 to protect the facilities on the frame 1. A lifting frame 17 is installed at the front of the frame 1. The lifting frame 17 plays a role in driving the ditch opening knife 14 to move up and down. A rotating shaft 35 is rotatably installed through the lower end of the lifting frame 17. An adjusting shaft 36 is fitted inside the rotating shaft 35. The rotating shaft 35 plays a role in driving the adjusting shaft 36 to rotate. Both ends of the adjusting shaft 36 penetrate through both ends of the rotating shaft 35. One end of the adjusting shaft 36 is installed with a ditch opening member. The adjusting shaft 36 can adjust the protruding distance of the ditch opening knife 14. One end of the rotating shaft 35 is fixedly installed with a bearing frame 37. A threaded rod 38 is screwed through the side of the bearing frame 37. The bearing frame 37 plays a role in bearing the threaded rod 38. The end of the threaded rod 38 is rotatably connected to the other end of the adjusting shaft 36. The threaded rod 38 plays a role in driving the adjusting shaft 36 to move. A convex rib 39 extends on the outer surface of the adjusting shaft 36. The convex rib 39 penetrates through the inner surface of the rotating shaft 35. The convex rib 39 plays a role in ensuring that the adjusting shaft 36 and the rotating shaft 35 can rotate synchronously. A moving member is installed at the lower end of the frame 1.

[0026] On both sides of the upper end of the lifting frame 17, guide columns 15 are fixedly installed. A guide sleeve 16 is fitted on the outer surface of the guide column 15. The guide column 15 and the guide sleeve 16 play a role in guiding the lifting frame 17. The guide sleeve 16 is fixed to the vehicle frame 1. A servo push cylinder 9 is fixedly installed at the rear of the vehicle frame 1. The servo push cylinder 9 plays a role in driving the lifting frame 17 to move up and down. A connecting ear 40 is fixedly installed at the output end of the servo push cylinder 9. The end of the connecting ear 40 is fixed to the lifting frame 17. The connecting ear 40 plays a role in connecting the output end of the servo push cylinder 9 and the lifting frame 17 together.

[0027] In the middle of the upper end of the lifting frame 17, a driving motor 2 is fixedly installed. The driving motor 2 plays a role in driving the rotating shaft 35 to rotate. A second synchronous belt 34 is connected between the output end of the driving motor 2 and the rotating shaft 35. The second synchronous belt 34 plays a role in transmission. A rib groove 10 is formed on the inner surface of the rotating shaft 35. The convex rib 39 fits into the rib groove 10. The rib groove 10 plays a role in cooperating with the convex rib 39. A battery 11 is installed inside the vehicle frame 1. The battery 11 plays a role in power supply.

[0028] The ditching member includes a ditching knife 14 coaxially and fixedly installed at one end of the adjusting shaft 36. A housing 5 is provided outside the ditching knife 14. Since ditching by the rotating ditching knife 14 is a prior art and has been widely applied, it is not elaborated in detail here. A housing frame 31 is fixedly installed on the side of the housing 5. The end of the housing frame 31 is rotatably connected to the adjusting shaft 36. The housing frame 31 plays a role in synchronously moving the housing 5 and the ditching knife 14. A square rod 32 is fixedly installed on the side of the housing frame 31. A square sleeve 33 is fitted on the outer surface of the square rod 32. The square sleeve 33 is penetrated and embedded in the lifting frame 17. The square rod 32 and the square sleeve 33 can limit the housing 5 to prevent the housing 5 from rotating.

[0029] The moving member includes a wheel shaft 7 rotatably installed at the front part of the lower end of the vehicle frame 1. A regulating sleeve 30 is fitted on the outer surface of the wheel shaft 7. The wheel shaft 7 plays a role in driving the front wheel 8 to rotate. The front wheel 8 is coaxially and fixedly installed on the outer surface of both the regulating sleeve 30 and one end of the wheel shaft 7. A servo motor 4 is arranged above the wheel shaft 7. The servo motor 4 is connected to the vehicle frame 1. The servo motor 4 plays a role in driving the wheel shaft 7 to rotate.

[0030] The outer surface of the axle 7 is provided with a limiting groove 27, and the inner surface of the adjusting sleeve 30 extends with a limiting block 28. The limiting block 28 fits inside the limiting groove 27. The limiting groove 27 and the limiting block 28 cooperate to enable the adjusting sleeve 30 and the axle 7 to rotate synchronously. A second fixing bolt 29 is screwed through the outer surface of the adjusting sleeve 30 and the front end of the limiting block 28, and the second fixing bolt 29 abuts against the bottom of the limiting groove 27. The second fixing bolt 29 functions to fix the adjusting sleeve 30. The upper end of the servo motor 4 is fixedly installed with a motor bracket 3, and the end of the motor bracket 3 is fixed to the vehicle frame 1. The motor bracket 3 functions to fix the servo motor 4. A first synchronous belt 6 is connected between the output end of the servo motor 4 and the axle 7, and the first synchronous belt 6 functions for transmission.

[0031] A T-shaped groove 21 is formed at the rear part of the lower end of the vehicle frame 1. A T-shaped seat 20 is fitted and installed inside the T-shaped groove 21. The T-shaped groove 21 functions to allow the T-shaped seat 20 to slide. A bearing shaft 12 is fixedly installed at one side of the lower end of both the T-shaped seat 20 and the rear part of the lower end of the vehicle frame 1. A bearing sleeve 13 is coaxially and rotatably installed at the lower end of the bearing shaft 12. The bearing shaft 12 functions to support the bearing sleeve 13. A rear wheel 18 is installed at the end of the bearing sleeve 13. A first fixing bolt 19 is screwed through the other side of the lower end of the T-shaped seat 20 and abuts against the inner top surface of the T-shaped groove 21. The first fixing bolt 19 functions to fix the T-shaped seat 20.

[0032] An extension seat 22 is fixedly installed at the upper edge of the outer surface of the bearing sleeve 13. A rotation blocking pin 23 is slidably installed through the end of the extension seat 22. The extension seat 22 functions to support the rotation blocking pin 23. The rotation blocking pin 23 is made of a material that does not adsorb magnetically to ensure that the rotation blocking pin 23 is not interfered by the magnetic ring 24 during the pulling process. A pin hole 26 is formed on the outer surface of the bearing shaft 12. The end of the rotation blocking pin 23 fits inside the pin hole 26. The pin hole 26 functions to cooperate with the rotation blocking pin 23. A fixing ring 25 is coaxially inlaid on the outer surface of the rotation blocking pin 23. The rotation blocking pin 23 functions to prevent the rear wheel 18 from turning. Two magnetic rings 24 are symmetrically inlaid inside the extension seat 22. The rotation blocking pin 23 passes through the inside of the magnetic rings 24. The fixing ring 25 is adsorbed to one of the magnetic rings 24, which can fix the rotation blocking pin 23 in the pin hole 26. The fixing ring 25 is adsorbed to the other magnetic ring 24, which can fix the rotation blocking pin 23 that has disengaged from the pin hole 26.

[0033] When ditching, the threaded rod 38 can be rotated first to drive the adjusting shaft 36 to slide in the rotating shaft 35, so as to adjust the protruding position of the ditching knife 14, that is, adjust the position of the ditching knife 14 relative to the wheel, so as to adapt to strawberry seedlings with different spacings. At the same time, the second fixing bolt 29 can be loosened, so that the fixed adjusting sleeve 30 can slide on the surface of the wheel axle 7 to drive one of the front wheels 8 to move, so as to adjust the spacing between the two front wheels 8. Similarly, the first fixing bolt 19 is loosened, so that the fixed T-shaped seat 20 can slide in the T-shaped groove 21 to drive one of the rear wheels 18 to move, so as to adjust the spacing between the two rear wheels 18, so that the spacing between the two side wheels can adapt to strawberry seedlings with different spacings, so that the ditching knife 14 will not crush the strawberry seedlings during ditching. Subsequently, the servo motor 4 can drive the front wheel 8 on the wheel axle 7 to rotate through the first synchronous belt 6 to drive the vehicle frame 1 to move forward. At the same time, the servo push cylinder 9 drives the ditching knife 14 to move down and contact the land in the greenhouse for ditching. During this process, the anti-rotation pin 23 can be pushed first to make the anti-rotation pin 23 insert into the pin hole 26 on the bearing shaft 12. At this time, the fixing ring 25 is adsorbed to the magnetic ring 24 to fix the anti-rotation pin 23 inserted into the pin hole 26. Under the action of the anti-rotation pin 23, the bearing sleeve 13 and the bearing shaft 12 can be fixed together, so that the rear wheel 18 will not turn, so as to ensure that the ditching knife 14 can ditch in a straight line during the ditching process.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for making trenches in greenhouses for growing strawberries, comprising a frame (1), characterized in that: A lifting frame (17) is installed at the front of the frame (1), a rotating shaft (35) is rotatably installed through the lower end of the lifting frame (17), an adjusting shaft (36) is fitted inside the rotating shaft (35), two ends of the adjusting shaft (36) pass through the two ends of the rotating shaft (35), a groove opening piece is installed at one end of the adjusting shaft (36), a bearing frame (37) is fixedly installed at one end of the rotating shaft (35), a threaded rod (38) is screwed through the side of the bearing frame (37), the end of the threaded rod (38) is rotatably connected to the other end of the adjusting shaft (36), a convex ridge (39) extends from the outer surface of the adjusting shaft (36), and the convex ridge (39) passes through the inner surface of the rotating shaft (35), and a moving part is installed at the lower end of the frame (1).

2. The field ditch grooving device for strawberry planting in greenhouse according to claim 1, characterized in that: Guide pillars (15) are fixedly mounted at both side edges of the upper end of the lifting frame (17); guide sleeves (16) are fitted on the outer surfaces of the guide pillars (15); the guide sleeves (16) are fixed on the vehicle frame (1); a servo push cylinder (9) is fixedly mounted on the rear of the vehicle frame (1); a connecting ear (40) is fixedly mounted on the output end of the servo push cylinder (9); and the end of the connecting ear (40) is fixed to the lifting frame (17).

3. The field ditch grooving device for strawberry planting in greenhouse according to claim 1, characterized in that: A driving motor (2) is fixedly mounted at the middle of the upper end of the lifting frame (17); a second synchronous belt (34) is connected between the output end of the driving motor (2) and the rotating shaft (35); an angular groove (10) is formed on the inner surface of the rotating shaft (35); the convex ridge (39) is fitted inside the angular groove (10); and a battery (11) is mounted on the inner side of the frame (1).

4. The field ditch grooving device for strawberry planting in greenhouse according to claim 1, characterized in that: The trenching member comprises a trenching knife (14) coaxially fixedly mounted on one end of an adjusting shaft (36); a cover shell (5) is provided on the outer side of the trenching knife (14); a shell frame (31) is fixedly mounted on the side of the cover shell (5); an end of the shell frame (31) is rotatably connected to the adjusting shaft (36); a square rod (32) is fixedly mounted on the side of the shell frame (31); a square sleeve (33) is fitted on the outer surface of the square rod (32); and the square sleeve (33) penetrates and is embedded in the lifting frame (17).

5. The field ditch grooving device for strawberry planting in greenhouse according to claim 1, characterized in that: The movable member comprises a wheel axle (7) rotatably mounted on the front lower end of the frame (1); an adjustment sleeve (30) is fitted on the outer surface of the wheel axle (7); a front wheel (8) is coaxially fixedly mounted on the outer surface of the adjustment sleeve (30) and one end of the wheel axle (7); a servo motor (4) is arranged above the wheel axle (7); and the servo motor (4) is connected to the frame (1).

6. The field ditch grooving device for strawberry planting in greenhouse according to claim 5, characterized in that: The outer surface of the wheel axle (7) is provided with a limiting groove (27), the inner surface of the adjusting sleeve (30) is extended with a limiting block (28), the limiting block (28) is fitted in the inside of the limiting groove (27), the outer surface of the adjusting sleeve (30) and the front end of the limiting block (28) are penetrated and tightened with a No. 2 fixing bolt (29), the No. 2 fixing bolt (29) is pressed against the bottom of the limiting groove (27), the upper end of the servo motor (4) is fixedly mounted with a motor frame (3), the end of the motor frame (3) is fixed to the vehicle frame (1), and a No. 1 synchronous belt (6) is connected between the output end of the servo motor (4) and the wheel axle (7).

7. The field ditch grooving device for strawberry planting in greenhouse according to claim 5, characterized in that: A T-shaped groove (21) is provided at the rear of the lower end of the frame (1), a T-shaped seat (20) is fitted inside the T-shaped groove (21), a load-bearing shaft (12) is fixedly mounted on one side of the lower end of the T-shaped seat (20) and the rear of the lower end of the frame (1), a load-bearing sleeve (13) is coaxially mounted on the lower end of the load-bearing shaft (12), a rear wheel (18) is mounted on the end of the load-bearing sleeve (13), a No. 1 fixing bolt (19) is screwed through the other side of the lower end of the T-shaped seat (20), and the No. 1 fixing bolt (19) is pressed against the inner top surface of the T-shaped groove (21).

8. The field ditch opening device for strawberry planting in greenhouse according to claim 7, characterized in that: An extension seat (22) is fixedly installed at the upper edge of the outer surface of the bearing sleeve (13), and a rotation-blocking pin (23) is slidably installed through the end of the extension seat (22). A pin hole (26) is opened on the outer surface of the bearing shaft (12), and the end of the rotation-blocking pin (23) fits into the inside of the pin hole (26). A fixing ring (25) is coaxially embedded on the outer surface of the rotation-blocking pin (23), and two magnetic rings (24) are symmetrically embedded in the interior of the extension seat (22). The rotation-blocking pin (23) passes through the inside of the magnetic ring (24), and the fixing ring (25) is attracted to one of the magnetic rings (24).