Rotary seedling raising box

By designing a rotary seedling box, the flexible rotation and precise positioning of the incubator are achieved, the problems of inconvenience and instability of the existing seedling box are solved, the light and ventilation uniformity of the plants are improved, the stability and applicability of the seedling box are enhanced, and the precise control needs of modern agriculture are met.

CN223094322UActive Publication Date: 2025-07-15ZHANGJIAKOU XIANGYOU AGRICULTURAL DEVELOPMENT CO LTD
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Patent Information

Application Number
CN202421755453.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-24
Publication Date
2025-07-15
Estimated Expiration
2034-07-24

AI Technical Summary

Technical Problem

The existing seedling boxes are inconvenient to operate during adjustment and fixation, and are unstable, which affects the uniformity of light and ventilation of plants and cannot meet the precise control needs of modern agriculture.

Method used

A rotating seedling box is designed, including an outer cover, a rotating frame and a locking member. The incubator on the rotating frame extends or retracts at the opening. Combined with the rapid fixing and release of the locking member, the flexible rotation and precise positioning of the incubator are achieved, and the stability is enhanced. Through the swing adjustment of the incubator and the fine adjustment of the moving box, it can adapt to the growth needs of different plants.

Benefits of technology

It improves the uniformity of plants receiving light and ventilation, enhances the operation convenience and stability of the seedling box, and improves the growth efficiency and space utilization of plants.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a rotary type seedling raising box which comprises an outer cover, a rotating frame and a locking piece, the outer cover is provided with an air opening for air flow to flow, the side face of the outer cover is provided with an opening, the rotating frame is arranged in the outer cover in a rotating mode, a cultivation box is arranged on the rotating frame and stretches out or retracts at the opening, and the locking piece is fixedly arranged on the outer cover. The rotating frame rotates on the locking piece, and the locking piece fixes the rotating frame to a preset position. According to the rotary seedling raising box, the outer cover, the rotating frame and the locking piece are arranged, so that the cultivation box can be flexibly rotated and fixed, the uniformity of illumination and ventilation received by plants is improved, and the growth efficiency of the plants is improved; through the design of a vertical plate and a circular shaft of the rotating frame, the stability and the flexibility of the rotating frame are enhanced, and accurate positioning of the cultivation box can be conveniently achieved; through the design of the screw rod and the top block of the locking piece, rapid fixing and releasing are achieved, the operation convenience is improved, and meanwhile the stability of the cultivation box is ensured.
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Description

Technical Field

[0001] The utility model relates to the technical field of seedling cultivation, and particularly relates to a rotary seedling cultivation box. Background Art

[0002] With the progress of modern agricultural technology, the seedling cultivation box plays a crucial role in the initial stage of plant growth. Its design directly affects the healthy growth and yield of plants. Most of the current seedling cultivation boxes on the market adopt a fixed structure. Due to the fixed setting of the multi-layer structure, the uniformity of light reception and ventilation of plants is restricted, thus affecting the growth efficiency of plants.

[0003] In the prior art, although some seedling cultivation boxes have tried to introduce adjustable mechanisms to improve the above problems, these designs are often too complex and can only achieve up-and-down telescoping or front-and-back telescoping. It is difficult for users to quickly adjust during use, and the problem of falling apart is likely to occur, thus unable to meet the requirements of modern agriculture for precise control of the seedling cultivation process. Therefore, there are obvious problems of inconvenient operation and low efficiency in realizing the rotation and fixation of the cultivation box in the existing seedling cultivation boxes. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a rotary seedling cultivation box to solve the problems of inconvenient operation and instability in the adjustment and fixation of the existing seedling cultivation boxes.

[0005] To achieve the above purpose, the technical solution of the utility model is realized as follows:

[0006] A rotary seedling cultivation box, comprising:

[0007] An outer cover, on which there are air vents for air flow, and an opening is provided on the side of the outer cover; a rotating frame, rotatably arranged inside the outer cover, a cultivation box is arranged on the rotating frame, and the cultivation box extends or retracts at the opening; a locking member, fixedly arranged on the outer cover, the rotating frame rotates on the locking member, and the locking member fixes the rotating frame at a preset position.

[0008] By adopting the above technical solution, the cultivation box on the rotating frame can flexibly extend or retract at the opening, which is convenient for plants to receive light and ventilation, and improves the growth efficiency of plants.

[0009] Furthermore, the rotating frame includes a vertically arranged vertical plate, and circular shafts fixedly arranged at the upper and lower ends of the vertical plate. The lower circular shaft is rotatably connected to the bottom of the outer cover, and a circular sleeve is fixedly arranged on the upper circular shaft, and the circular sleeve rotates along the central axis of the locking member.

[0010] By adopting the above technical solution, the stability and rotation flexibility of the rotating frame are enhanced, which is convenient for realizing the precise positioning of the cultivation box.

[0011] Furthermore, the locking member includes a fixed shaft penetrating through the top of the outer cover, a top block slidably arranged horizontally on the fixed shaft, and a screw rod screwed on the central axis of the fixed shaft. The circular sleeve is sleeved on the bottom of the fixed shaft, and the screw rod pushes the top block to abut against the inner wall of the circular sleeve.

[0012] By adopting the above technical solution, the locking member can effectively fix the rotating frame at a preset position, prevent displacement during rotation, and ensure the stability of the cultivation box.

[0013] Furthermore, a circular hole is provided on the central axis of the fixed shaft. A threaded groove is provided at the upper part of the circular hole, and the bottom of the circular hole is a tapered hole. The screw rod is threadedly connected to the threaded groove, and the bottom of the screw rod is a cone adapted to the tapered hole.

[0014] By adopting the above technical solution, rapid fixing and releasing of the locking member can be achieved, improving the convenience of operation.

[0015] Furthermore, a chute is provided on the side surface of the lower part of the fixed shaft. The chute communicates with the circular hole, and the top block slides in the chute. The screw rod pushes the top block to extend out of the fixed shaft.

[0016] By adopting the above technical solution, the position of the top block can be flexibly adjusted to adapt to cultivation boxes of different sizes, enhancing the applicability of the seedling cultivation box.

[0017] Furthermore, the cultivation box includes a fixed box fixedly arranged on the side surface of the upper part of the vertical plate, a movable box swingably arranged at the bottom of the fixed box, and a first connecting rod and a second connecting rod rotatably connected between the movable box and the fixed box.

[0018] By adopting the above technical solution, the cultivation box can be swing-adjusted to adapt to the growth requirements of different plants, improving the space utilization rate.

[0019] Furthermore, the movable box includes a first movable box and a second movable box. One end of the first connecting rod and the second connecting rod is rotatably connected to the side surface of the fixed box. The middle end of the first connecting rod and the other end of the second connecting rod are rotatably connected to the side surface of the first movable box; the other end of the first connecting rod is rotatably connected to the side surface of the second movable box. A third connecting rod is rotatably arranged between the first movable box and the second movable box. The first connecting rod, the second connecting rod, and the third connecting rod are arranged in parallel.

[0020] By adopting the above technical solution, the movable box can be adjusted more precisely to adapt to the cultivation requirements of plants at different levels, increasing the flexibility of the seedling cultivation box.

[0021] Further, a limiting plate is rotatably arranged on the vertical plate, the limiting plate fixes the second moving box on the vertical plate, a supporting rod is rotatably arranged on the vertical plate, and the supporting rod supports on the second moving box.

[0022] By adopting the above technical solutions, the stability of the second moving box can be ensured. At the same time, the supporting rod provides additional support for the moving box, improving the stability after the moving box extends out.

[0023] Compared with the prior art, the present utility model has the following beneficial effects:

[0024] By arranging the outer cover, the rotating frame and the locking member, the flexible rotation and fixation of the cultivation box are realized, improving the uniformity of the plants receiving light and ventilation, thereby improving the growth efficiency of the plants; through the design of the vertical plate and the round shaft of the rotating frame, the stability and flexibility of the rotating frame are enhanced, facilitating the precise positioning of the cultivation box; through the design of the screw rod and the top block of the locking member, rapid fixation and release are realized, improving the convenience of operation and ensuring the stability of the cultivation box at the same time; through the swing adjustment of the cultivation box and the fine adjustment of the moving box, the flexibility and space utilization rate of the seedling cultivation box are increased, adapting to the growth requirements of different plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0026] In the drawings:

[0027] Figure 1 is a schematic diagram of the overall structure of the rotary seedling cultivation box according to the embodiment of the present utility model;

[0028] Figure 2 is an exploded view of the rotating frame and the outer cover according to the embodiment of the present utility model;

[0029] Figure 3 is an exploded view of the locking member and the rotating frame according to the embodiment of the present utility model;

[0030] Figure 4 is an exploded view of the locking member according to the embodiment of the present utility model;

[0031] Figure 5 is a front view of the locking member according to the embodiment of the present utility model;

[0032] Figure 6 is a diagram of the retracted state of the cultivation box according to the embodiment of the present utility model;

[0033] Figure 7Schematic diagram of the extended state of the incubator according to an embodiment of the present utility model;

[0034] Figure 8 Cross-sectional view of the locking member according to an embodiment of the present utility model.

[0035] Explanation of reference numerals in the drawings:

[0036] 1. Outer cover; 2. Air outlet; 3. Opening;

[0037] 4. Rotating frame; 401. Vertical plate; 402. Circular shaft; 403. Circular sleeve;

[0038] 5. Incubator; 501. Fixed box; 502. First moving box; 503. Second moving box; 504. First connecting rod; 505. Second connecting rod; 506. Third connecting rod;

[0039] 6. Locking member; 601. Fixed shaft; 602. Top block; 603. Screw; 604. Round hole; 605. Thread groove; 606. Tapered hole; 607. Cone; 608. Slide groove;

[0040] 7. Limiting plate; 8. Support rod. Detailed implementation manners

[0041] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0042] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with the specific circumstances.

[0044] Hereinafter, the present utility model will be described in detail with reference to the drawings and in combination with the embodiments.

[0045] This embodiment relates to a rotary seedling raising box. In terms of the overall structure, as shown in Figure 1 , Figure 6 and Figure 7 , it includes an outer cover 1, a rotating frame 4, and a locking member 6.

[0046] Among them, an air outlet 2 for air flow is provided on the outer cover 1, an opening 3 is provided on the side of the outer cover 1, the rotating frame 4 is rotatably arranged inside the outer cover 1, a cultivation box 5 is arranged on the rotating frame 4, and the cultivation box 5 extends out or retracts at the opening 3. The locking member 6 is fixedly arranged on the outer cover 1, and the rotating frame 4 rotates on the locking member 6. The locking member 6 fixes the rotating frame 4 at a preset position.

[0047] It is worth mentioning that the setting of the air outlet 2 ensures that there is air flow inside the outer cover 1. The setting of the opening 3 facilitates the cultivation box 5 to extend out of the outer cover 1, which is convenient for sunlight to irradiate the seedlings. The rotating frame 4 rotates on the outer cover 1 to ensure that after sufficient sunlight irradiation, the cultivation box 5 can be rotated back into the outer cover 1 to avoid excessive irradiation and affecting the growth of the seedlings. Two groups of cultivation boxes 5 can be relatively arranged on the rotating frame 4. When one group has received sunlight irradiation, the other group can be rotated out for irradiation, improving the flexibility of the equipment. The locking member 6 can ensure that the rotating frame 4 is fixed in this position, ensuring that when the seedlings are irradiated, the rotating frame 4 will not rotate by itself, improving the accuracy of the seedling irradiation time.

[0048] Based on the above overall introduction, an exemplary structure of the rotary seedling raising box of this embodiment is shown in Figure 2 and Figure 3 . The rotating frame 4 includes a vertical plate 401 and round shafts 402 fixedly arranged at the upper and lower ends of the vertical plate 401. The lower round shaft 402 is rotatably connected to the bottom of the outer cover 1, and a round sleeve 403 is fixedly arranged on the upper round shaft 402. The round sleeve 403 rotates along the central axis of the locking member 6.

[0049] It should be noted that the vertical plate 401 is located in the middle of the opening 3, the vertical plate 401 is for installing the cultivation box 5, the round shafts 402 are installed in the middle of the vertical plate 401, and the round shafts 402 facilitate the rotation of the vertical plate 401 inside the outer cover 1. The round sleeve 403 is sleeved on the locking member 6. When the locking member 6 releases the round sleeve 403, the rotating frame 4 can rotate. When the locking member 6 clamps the round sleeve 403, the rotating frame 4 is fixed in this position. Such a setting can convert the irradiation of the cultivation box 5.

[0050] As a preferred implementation manner, as shown in Figure 3 and Figure 4 , in this embodiment, the locking member 6 includes a fixed shaft 601 passing through the top of the outer cover 1, a top block 602 slidably arranged horizontally on the fixed shaft 601, and a screw rod 603 screwed on the central axis of the fixed shaft 601. The round sleeve 403 is sleeved on the bottom of the fixed shaft 601, and the screw rod 603 pushes the top block 602 to abut against the inner wall of the round sleeve 403.

[0051] It should be noted that the fixed shaft 601 is fixedly installed at the top of the outer cover 1. The diameter inside the circular sleeve 403 is equal to the diameter of the fixed shaft 601. The circular sleeve 403 rotates along the central axis of the fixed shaft 601. The central axes of the screw rod 603 and the top block 602 are perpendicularly arranged. The up and down movement of the screw rod 603 can push the top block 602 to extend and retract on the fixed shaft 601. When the top block 602 extends and abuts against the circular sleeve 403, the rotating frame 4 can be fixed to prevent the rotating frame 4 from rotating by itself. When the top block 602 retracts and separates from the circular sleeve 403, the circular sleeve 403 can rotate on the fixed shaft 601, thereby rotating the rotating frame 4.

[0052] Preferably, as Figure 4 , Figure 5 and Figure 8 shown, a circular hole 604 is provided on the central axis of the fixed shaft 601 of this embodiment. A threaded groove 605 is provided in the upper part of the circular hole 604. The bottom of the circular hole 604 is a tapered hole 606. The screw rod 603 is threadedly connected to the threaded groove 605. The bottom of the screw rod 603 is a cone 607 adapted to the tapered hole 606. A chute 608 is provided on the lower side surface of the fixed shaft 601. The chute 608 communicates with the circular hole 604. The top block 602 slides in the chute 608. The screw rod 603 pushes the top block 602 to extend out of the fixed shaft 601.

[0053] Specifically, the screw rod 603 rises and falls in the circular hole 604. The threaded groove 605 is located in the upper middle part of the circular hole 604. Similarly, the upper middle part of the screw rod 603 is provided with threads. Such a setting ensures that the screw rod 603 can push the top block 602 to move and stay in this position. The setting of the tapered hole 606 facilitates the insertion of the cone 607. The purpose of setting the cone 607 at the bottom of the screw rod 603 is to ensure that the top block 602 can move along the trajectory of the cone 607, so as to ensure that the top block 602 can abut against the circular sleeve 403 with different inner diameters, improving the applicability. The setting of the chute 608 is for the top block 602 to move, ensuring that the top block 602 can contact the screw rod 603, so as to realize the screw rod 603 pushing the top block 602 to move.

[0054] As a preferred implementation manner, as Figure 6 and Figure 7 shown, in this embodiment, the cultivation box 5 includes a fixed box 501 fixedly arranged on the upper side surface of the vertical plate 401, a moving box swingably arranged at the bottom of the fixed box 501, a first connecting rod 504 and a second connecting rod 505 rotatably connected between the moving box and the fixed box 501.

[0055] It should be noted that the fixed box 501 is located above the movable box, and the fixed box 501 is fixedly installed on the vertical plate 401. Since the fixed box 501 and the movable box are arranged vertically, the fixed box 501 will affect the irradiation of the movable box. Therefore, the movable box can extend out from the bottom of the fixed box 501. When the movable box moves, the first connecting rod 504 and the second connecting rod 505 can move along with the movable box, so as to ensure the stability of the movement of the movable box, and ensure that the movable box can only move along the trajectories of the first connecting rod 504 and the second connecting rod 505, and ensure that the movable box is in a parallel state when moving, so as to avoid the water in the cultivation box 5 from accumulating together.

[0056] Preferably, still as Figure 6 and Figure 7 shown, in this embodiment, the movable box includes a first movable box 502 and a second movable box 503. One ends of the first connecting rod 504 and the second connecting rod 505 are rotatably connected to the side surface of the fixed box 501, and the middle end of the first connecting rod 504 and the other end of the second connecting rod 505 are rotatably connected to the side surface of the first movable box 502; the other end of the first connecting rod 504 is rotatably connected to the side surface of the second movable box 503, and a third connecting rod 506 is rotatably arranged between the first movable box 502 and the second movable box 503. The first connecting rod 504, the second connecting rod 505, and the third connecting rod 506 are arranged in parallel.

[0057] Specifically, in this embodiment, the first movable box 502 and the second movable box 503 are the same, that is, there are two movable boxes. The first connecting rod 504 is respectively connected to the fixed box 501, the first movable box 502, and the second movable box 503 through a rotating shaft, which can realize the linkage of the first movable box 502 and the second movable box 503, facilitating the operation of personnel. In order to ensure that the first movable box 502 and the second movable box 503 always remain horizontal, the second connecting rod 505 is used to control the fixed box 501 and the first movable box 502, and the third connecting rod 506 is used to control the first movable box 502 and the second movable box 503. Since the length of the first connecting rod 504 is twice the lengths of the second connecting rod 505 and the third connecting rod 506, and the second connecting rod 505 and the third connecting rod 506 always remain parallel to the first connecting rod 504, the first movable box 502 and the second movable box 503 can always remain parallel. Arranging the first connecting rod 504, the second connecting rod 505, and the third connecting rod 506 on both sides of the cultivation box 5 can ensure the stability of the cultivation box 5 when rotating.

[0058] Preferably, still as Figure 6 and Figure 7As shown in the figure, a restricting plate 7 is rotatably arranged on the vertical plate 401 of this embodiment. The restricting plate 7 fixes the second moving box 503 on the vertical plate 401. A supporting rod 8 is rotatably arranged on the vertical plate 401, and the supporting rod 8 supports the second moving box 503. Specifically, when the second moving box 503 moves close to the vertical plate 401, the restricting plate 7 can be rotated into the second moving box 503. Such a setting ensures that the first moving box 502 and the second moving box 503 are close to the vertical plate 401 and are clamped on the vertical plate 401. At this time, the fixed box 501, the first moving box 502, and the second moving box 503 are located on the same vertical plane, which is convenient for rotation into the outer cover 1. At this time, the cultivation box 5 retracts into the outer cover 1 from the opening 3. When the second moving box 503 extends out of the outer cover 1, the second moving box 503 and the first moving box 502 are away from the vertical plate 401. Due to the linkage of the first connecting rod 504, the first moving box 502 will move following the second moving box 503. When moving to a preset position, the supporting rod 8 can be rotated and the supporting rod 8 is abutted against the side surface of the second moving box 503. Such a setting ensures that the first moving box 502 and the second moving box 503 can maintain at this position after extending out.

[0059] In the rotatable seedling cultivation box of this embodiment, by arranging the outer cover 1, the rotating frame 4, and the locking member 6, the flexible rotation and fixation of the cultivation box 5 are realized, the uniformity of light reception and ventilation of plants is improved, and thus the growth efficiency of plants is improved; through the design of the vertical plate 401 and the round shaft 402 of the rotating frame 4, the stability and flexibility of the rotating frame 4 are enhanced, which is convenient for realizing the precise positioning of the cultivation box 5; through the design of the screw rod 603 and the top block 602 of the locking member 6, the rapid fixation and release are realized, the convenience of operation is improved, and at the same time the stability of the cultivation box 5 is ensured; through the swing adjustment of the cultivation box 5 and the fine adjustment of the moving box, the flexibility and space utilization rate of the seedling cultivation box are increased, and the growth requirements of different plants are adapted.

[0060] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A rotary seedling raising box, characterized in that, Comprising: An outer cover (1) with an air outlet (2) for air flow provided thereon, and an opening (3) provided on the side of the outer cover (1); A rotating frame (4) rotatably arranged inside the outer cover (1), a cultivation box (5) is arranged on the rotating frame (4), and the cultivation box (5) extends or retracts at the opening (3); A locking member (6) fixedly arranged on the outer cover (1), the rotating frame (4) rotates on the locking member (6), and the locking member (6) fixes the rotating frame (4) at a preset position.

2. The rotating seedling cultivation box according to claim 1, characterized in that: The rotating frame (4) includes a vertical plate (401), circular shafts (402) fixedly arranged at the upper and lower ends of the vertical plate (401), the lower circular shaft (402) is rotatably connected to the bottom of the outer cover (1), and a circular sleeve (403) is fixedly arranged on the upper circular shaft (402), and the circular sleeve (403) rotates along the central axis of the locking member (6).

3. The rotating seedling cultivation box according to claim 2, characterized in that: The locking member (6) includes a fixed shaft (601) penetrating through the top of the outer cover (1), a top block (602) slidably arranged horizontally on the fixed shaft (601), and a screw rod (603) screwed on the central axis of the fixed shaft (601), the circular sleeve (403) is sleeved on the bottom of the fixed shaft (601), and the screw rod (603) pushes the top block (602) to abut against the inner wall of the circular sleeve (403).

4. The rotating seedling cultivation box according to claim 3, characterized in that: A circular hole (604) is provided on the central axis of the fixed shaft (601), a threaded groove (605) is provided in the upper part of the circular hole (604), the bottom of the circular hole (604) is a tapered hole (606), the screw rod (603) is threadedly connected to the threaded groove (605), and the bottom of the screw rod (603) is a cone body (607) adapted to the tapered hole (606).

5. The rotating seedling cultivation box according to claim 4, characterized in that: A chute (608) is provided on the side of the lower part of the fixed shaft (601), the chute (608) communicates with the circular hole (604), the top block (602) slides in the chute (608), and the screw rod (603) pushes the top block (602) to extend out of the fixed shaft (601).

6. The rotating seedling cultivation box according to claim 2, characterized in that: The cultivation box (5) includes a fixed box (501) fixedly arranged on the upper side of the vertical plate (401), a movable box swingably arranged at the bottom of the fixed box (501), a first connecting rod (504) and a second connecting rod (505) rotatably connected between the movable box and the fixed box (501).

7. The rotating seedling cultivation box according to claim 6, characterized in that: The mobile box includes a first mobile box (502) and a second mobile box (503). One end of the first connecting rod (504) and the second connecting rod (505) is rotatably connected to the side of the fixed box (501), and the middle end of the first connecting rod (504) and the other end of the second connecting rod (505) are rotatably connected to the side of the first mobile box (502). The other end of the first connecting rod (504) is rotatably connected to the side of the second mobile box (503). A third connecting rod (506) is rotatably arranged between the first mobile box (502) and the second mobile box (503). The first connecting rod (504), the second connecting rod (505), and the third connecting rod (506) are arranged in parallel.

8. The rotatable seedling raising box according to claim 7, wherein: A limiting plate (7) is rotatably arranged on the vertical plate (401). The limiting plate (7) fixes the second mobile box (503) on the vertical plate (401). A support rod (8) is rotatably arranged on the vertical plate (401), and the support rod (8) supports the second mobile box (503).