Stackable throwing disc, quick throwing disc taking and placing device and method

Abstract

This invention relates to the field of agricultural seedling raising equipment technology, and discloses a stackable and storable seedling throwing tray, including a first seedling throwing tray, a second seedling throwing tray mounted on top of the first seedling throwing tray, and pull rods fixedly connected to the sides of both the first and second seedling throwing trays. Positioning grooves are formed on the upper parts of both the first and second seedling throwing trays. A positioning block is fixedly connected to the bottom of the second seedling throwing tray, and a guide bevel is formed on the outer wall of the bottom end of the positioning block. A lead screw is rotatably connected to a mounting block via a bearing, a connecting rod is threaded onto the outer wall of the lead screw, an adjusting seat is slidably connected to the outer wall of a guide rail, the output end of an electric telescopic rod is fixedly connected to a mounting rod, and a dividing bevel is formed at the end of the layering rod. This invention solves the problem that existing seedling throwing trays are prone to jamming and sticking when stacked, making manual removal laborious and affecting the applicability of the device.

Description

Technical Field

[0001] This invention relates to the field of agricultural seedling raising equipment technology, specifically to a stackable and storable seedling throwing tray, a quick-release device for the seedling throwing tray, and a method thereof. Background Technology

[0002] Rice transplanting technology is widely used in rice planting production due to its advantages of high efficiency, low labor intensity and high seedling survival rate. The transplanting tray is the core equipment in the rice transplanting process. It is mainly used to cultivate rice seedlings. After the seedlings grow, they are removed from the tray and transplanted into the paddy field.

[0003] However, when using existing rice seedling trays, stacking them can easily cause them to get stuck and become stuck, making it difficult to manually remove the trays and thus affecting the applicability of the device.

[0004] To address this issue, we propose a stackable and storable rice seedling tray, a quick-release device for the rice seedling tray, and a method for solving the problem. Summary of the Invention

[0005] The purpose of this invention is to provide a stackable and storable rice seedling tray, a quick-release device and method for the rice seedling tray, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stackable rice seedling tray, comprising a first rice seedling tray, a second rice seedling tray on the upper part of the first rice seedling tray, and pull rods fixedly connected to the sides of both the first and second rice seedling trays. Positioning grooves are provided on the upper parts of both the first and second rice seedling trays, and a positioning block is fixedly connected to the bottom of the second rice seedling tray. A guide angle is provided on the outer wall of the bottom end of the positioning block. Through the cooperation of the positioning grooves, positioning block, and pull rods, a certain gap can be created between the first and second rice seedling trays, making it easier to stack the first and second rice seedling trays, preventing them from getting stuck, and facilitating subsequent mechanical or manual handling, thus increasing the applicability of the device.

[0007] A quick-release device for a rice seedling tray includes a movable base disposed on the right side of the rice seedling tray; And a connecting component disposed on the upper part of the mobile base, the connecting component including a transfer mechanism disposed on the upper part of the mobile base, the upper part of the mobile base being provided with a pick-and-place mechanism.

[0008] Preferably, the transfer mechanism includes a mounting block fixedly installed at the bottom of the movable base. A motor is fixedly installed on the outside of the mounting block via a support. A lead screw is fixedly connected to the output end of the motor. An adjustment hole is provided on the upper part of the movable base. A guide rod is fixedly connected to the inner wall of the adjustment hole. An adjustment block is slidably connected to the outer wall of the guide rod. A connecting rod is fixedly connected to the bottom of the adjustment block. An adjustment seat is fixedly connected to the upper part of the adjustment block. A guide rail is fixedly connected to the upper part of the movable base. An adjustment seat is fixedly connected to the upper part of the adjustment block.

[0009] Preferably, the picking and placing mechanism includes a support base fixedly installed on the upper part of the adjusting seat. The surface of the support base has an adjusting hole two. An adjusting rod two is fixedly connected to the inner wall of the adjusting hole two. An adjusting block two is slidably connected to the outer wall of the adjusting rod two. An installation rod is fixedly connected to one side of the adjusting block two. An electric telescopic rod is fixedly installed on the top of the support base through a fixed seat. An installation seat is fixedly connected to the side of the adjusting block two away from the installation rod. A sliding groove is opened on the outer side of the installation seat. A sliding rod is fixedly connected to the inner wall of the sliding groove. A slider is slidably connected to the outer wall of the sliding rod. A connecting seat is fixedly connected to the outer side of the slider. An adjusting groove is opened on the outer side of the installation seat. A locking rod is movably inserted inside the connecting seat. A connecting plate is fixedly connected to the outer end of the locking rod. A spring is fixedly connected to the outer side of the connecting seat. A layered rod is fixedly connected to the outer side of the connecting seat.

[0010] Preferably, the lead screw is rotatably connected to the mounting block via a bearing, the connecting rod is threaded onto the outer wall of the lead screw, and the adjusting seat is slidably connected to the outer wall of the guide rail. Through the cooperation of the mounting block, motor, lead screw, adjusting hole one, guide rod one, adjusting block one, adjusting seat, guide rail, and connecting rod, the removed seedling tray two or other seedling trays can be moved above the moving base. This prevents the seedling tray two from being exposed outside the moving base and from accidentally colliding with external objects during transportation, which could cause the seedling tray two to fall off, further increasing the applicability of the device.

[0011] Preferably, the output end of the electric telescopic rod is fixedly connected to the mounting rod, and the end of the layered rod is provided with a dividing plate slope. Through the cooperation of the support seat, the second adjustment hole, the second adjustment rod, the second adjustment block, the mounting rod, the electric telescopic rod, the mounting seat, the slide groove, the slide rod, the slider, the adjusting groove, the connecting seat, the layered rod, the locking rod, the connecting plate, and the spring, the device can be used to pick up and put down seedling trays of different heights or other seedling trays. At the same time, the spacing of the layered rods can be adjusted, so that it can be used for seedling trays of different sizes, further increasing the applicability of the device.

[0012] Preferably, the locking rod is engaged with the adjusting groove, and the outer end of the spring is fixedly connected to the connecting plate.

[0013] A method for quickly placing and removing rice seedling trays includes the following steps: S1: First, move the movable base to the vicinity of seedling tray 1 and seedling tray 2. Then, move the installation rod and adjustment block 2 by means of the electric telescopic rod, so that the height of the layering rod can be adjusted. This allows for the placement and removal of seedling trays of different heights. When the layering rod is adjusted to the appropriate height and is located between seedling tray 1 and seedling tray 2, push the movable base inward to push the layering rod between seedling tray 1 and seedling tray 2. Since the end of the layering rod is inclined, it can separate seedling tray 1 and seedling tray 2, which can prevent seedling tray 1 and seedling tray 2 from being stuck together. Then, move the installation rod upward by means of the electric telescopic rod to remove seedling tray 2. S2: After the second rice-throwing tray is taken out upwards, the motor drives the mounting block to rotate clockwise. Under the guidance of the first guide rod and the first adjusting block, the connecting rod threaded to the outer wall of the screw can move the first adjusting block to the right. This allows the adjusting seat fixed to the upper part of the first adjusting block to move to the right synchronously, and then the support seat to move to the right synchronously. This allows the second rice-throwing tray to be moved to the right synchronously, and can be moved to the upper part of the moving base. This avoids the second rice-throwing tray being located outside the moving base and accidentally colliding with external objects during the transfer process, which could cause the second rice-throwing tray to fall. This makes it easier to transfer the second rice-throwing tray. S3: When the second rice seedling tray is transferred to a suitable position and needs to be stacked, simply insert the positioning block fixed to the bottom of the second rice seedling tray into the positioning groove to complete the stacking operation of the first and second rice seedling trays. Since the bottom of the positioning block has a guide angle, it is easier to align the positioning block and the positioning groove, which makes it easier to stack the first and second rice seedling trays.

[0014] This invention provides a stackable and storable rice seedling tray, a quick-release device for the rice seedling tray, and a method thereof. This stackable and storable rice seedling tray, quick-release device for the rice seedling tray, and method thereof have the following beneficial effects:

[0015] (1) The stackable and storable seedling tray, seedling tray quick pick-up and drop device and method, under the action of positioning groove, positioning block and pull rod, can make a certain gap between seedling tray one and seedling tray two, which makes it easier to stack seedling tray one and seedling tray two, avoids seedling tray one and seedling tray two from being stuck by suction, and facilitates subsequent mechanical pick-up and drop operation or manual pick-up and drop operation, increasing the applicability of the device; (2) The stackable and storable rice seedling tray, the quick-release and release device and method of the rice seedling tray, by setting up a transfer mechanism, under the action of the mounting block, motor, screw, adjustment hole one, guide rod one, adjustment block one, adjustment seat, guide slide rail and connecting rod, can move the rice seedling tray two or other rice seedling trays above the moving base, which can prevent the rice seedling tray two from being exposed to the outside of the moving base and from accidentally colliding with external objects during the transfer process, causing the rice seedling tray two to fall, and further increases the applicability of the device; (3) The stackable and storable seedling tray, seedling tray quick pick-up and drop device and method, by setting up a pick-up and drop mechanism, under the action of support base, adjustment hole two, adjustment rod two, adjustment block two, installation rod, electric telescopic rod, installation base, slide groove, slide rod, slider, adjustment groove, connecting base, layering rod, clamping rod, connecting plate and spring, can pick up and drop seedling tray two of different heights or other seedling trays. At the same time, the spacing of the layering rods can be adjusted, so it can be applied to seedling tray two of different sizes, further increasing the applicability of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the layered structure of the seedling throwing tray one and seedling throwing tray two of the present invention; Figure 4 This is a schematic diagram of the transfer mechanism structure of the present invention; Figure 5 This is a schematic diagram of the picking and placing mechanism of the present invention; Figure 6 This is a partial structural diagram of the picking and placing mechanism of the present invention; In the diagram: 1. Seedling Throwing Tray 1; 2. Movable Base; 3. Connecting Component; 31. Transfer Mechanism; 311. Mounting Block; 312. Motor; 313. Lead Screw; 314. Adjustment Hole 1; 315. Guide Rod 1; 316. Adjustment Block 1; 317. Adjustment Seat; 318. Guide Rail; 319. Connecting Rod; 32. Picking and Placing Mechanism; 321. Support Seat; 322. Adjustment Hole 2; 323. Adjustment Rod 2; 324. Adjustment Block 2; 325. Mounting Rod; 326. Electric Telescopic Rod; 327. Mounting Seat; 328. Slide Groove; 329. Slide Rod; 3210. Sliding Block; 3211. Adjustment Groove; 3212. Connecting Seat; 3213. Layered Rod; 3214. Locking Rod; 3215. Connecting Plate; 3216. Spring; 4. Seedling Throwing Tray 2; 5. Positioning Groove; 6. Positioning Block; 7. Pull Rod. Detailed Implementation

[0017] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0018] Example 1 like Figure 1-6 As shown, the present invention provides a technical solution: a stackable rice seedling tray, including a first rice seedling tray 1, a second rice seedling tray 4 on the upper part of the first rice seedling tray 1, and a pull rod 7 fixedly connected to the sides of both the first rice seedling tray 1 and the second rice seedling tray 4. Positioning grooves 5 are provided on the upper parts of both the first rice seedling tray 1 and the second rice seedling tray 4. A positioning block 6 is fixedly connected to the bottom of the second rice seedling tray 4, and a guide angle is provided on the outer wall of the bottom end of the positioning block 6. Through the cooperation of the positioning grooves 5, the positioning block 6, and the pull rods 7, a certain gap can be made between the first rice seedling tray 1 and the second rice seedling tray 4, which makes it easier to stack the first rice seedling tray 1 and the second rice seedling tray 4, avoids the first rice seedling tray 1 and the second rice seedling tray 4 from being stuck, and facilitates subsequent mechanical or manual handling, increasing the applicability of the device.

[0019] Example 2 Based on Example 1, a preferred embodiment of the rapid seedling tray picking and placing device provided by the present invention is as follows: Figures 1 to 6 As shown: A rapid seedling tray picking and placing device includes a movable base 2 disposed on the right side of the seedling tray 1, and a connecting component 3 disposed on the upper part of the movable base 2. The connecting component 3 includes a transfer mechanism 31 disposed on the upper part of the movable base 2. A picking and placing mechanism 32 is disposed on the upper part of the movable base 2. The transfer mechanism 31 includes a mounting block 311 fixedly installed on the bottom of the movable base 2. A motor 312 is fixedly installed on the outer side of the mounting block 311 via a support. A lead screw 313 is fixedly connected to the output end of the motor 312. An adjustment hole 314 is opened on the upper part of the movable base 2. A guide rod 315 is fixedly connected to the inner wall of the adjustment hole 314. An adjustment block 316 is slidably connected to the outer wall of the guide rod 315. A connecting rod 319 is fixedly connected to the bottom of the adjustment block 316. An adjustment seat 317 is fixedly connected to the upper part of the adjustment block 316. A guide rail 318 is fixedly connected to the upper part of the movable base 2. An adjustment seat 317 is fixedly connected to the upper part of the adjustment block 316.

[0020] In this embodiment, the lead screw 313 is rotatably connected to the mounting block 311 via a bearing, the connecting rod 319 is threadedly connected to the outer wall of the lead screw 313, and the adjusting seat 317 is slidably connected to the outer wall of the guide rail 318. Through the cooperation of the mounting block 311, motor 312, lead screw 313, adjusting hole 314, guide rod 315, adjusting block 316, adjusting seat 317, guide rail 318, and connecting rod 319, the transplanted seedling tray 2 or other seedling tray can be moved above the moving base 2. This prevents the seedling tray 2 from being exposed to the outside of the moving base 2 and from accidentally colliding with external objects during transportation, which could cause the seedling tray 2 to fall off, further increasing the applicability of the device.

[0021] Example 3 Based on Example 1, a preferred embodiment of the rapid seedling tray picking and placing device provided by the present invention is as follows: Figures 1 to 6 As shown: The pick-and-place mechanism 32 includes a support base 321 fixedly installed on the upper part of the adjusting base 317. An adjusting hole 322 is formed on the surface of the support base 321. An adjusting rod 323 is fixedly connected to the inner wall of the adjusting hole 322. An adjusting block 324 is slidably connected to the outer wall of the adjusting rod 323. A mounting rod 325 is fixedly connected to one side of the adjusting block 324. An electric telescopic rod 326 is fixedly installed on the top of the support base 321 via a fixed seat. A mounting seat 327 is fixedly connected to the side of the adjusting block 324 away from the mounting rod 325. A sliding groove 328 is provided on the outer side of the mounting base 327. A sliding rod 329 is fixedly connected to the inner wall of the sliding groove 328. A slider 3210 is slidably connected to the outer wall of the sliding rod 329. A connecting seat 3212 is fixedly connected to the outer side of the slider 3210. An adjustment groove 3211 is provided on the outer side of the mounting base 327. A locking rod 3214 is movably passed through the inside of the connecting seat 3212. A connecting plate 3215 is fixedly connected to the outer end of the locking rod 3214. A spring 3216 is fixedly connected to the outer side of the connecting seat 3212. A layered rod 3213 is fixedly connected to the outer side of the connecting seat 3212.

[0022] In this embodiment, the output end of the electric telescopic rod 326 is fixedly connected to the mounting rod 325, and the end of the layered rod 3213 is provided with a dividing plate slope. Through the cooperation of the support seat 321, the second adjustment hole 322, the second adjustment rod 323, the second adjustment block 324, the mounting rod 325, the electric telescopic rod 326, the mounting seat 327, the sliding groove 328, the sliding rod 329, the slider 3210, the adjusting groove 3211, the connecting seat 3212, the layered rod 3213, the locking rod 3214, the connecting plate 3215, and the spring 3216, the device can be used to pick up and put down seedling trays 4 of different heights or other seedling trays. At the same time, the spacing of the layered rods 3213 can be adjusted, so that it can be used for seedling trays 4 of different sizes, further increasing the applicability of the device.

[0023] Furthermore, the locking rod 3214 is engaged with the adjusting groove 3211, and the outer end of the spring 3216 is fixedly connected to the connecting plate 3215.

[0024] A method for quickly placing and removing rice seedling trays includes the following steps: S1: First, move the movable base 2 to the vicinity of the seedling tray 1 and seedling tray 2. Then, move the installation rod 325 and the adjustment block 2 324 via the electric telescopic rod 326 to adjust the height of the layering rod 3213. This allows for the placement and removal of seedling trays at different heights. Once the layering rod 3213 is adjusted to the appropriate height and positioned between seedling tray 1 and seedling tray 2, push the movable base 2 inward to insert the layering rod 3213 between seedling tray 1 and seedling tray 2. Since the end of the layering rod 3213 is inclined, it can separate seedling tray 1 and seedling tray 2, preventing them from getting stuck. Then, move the installation rod 325 upward via the electric telescopic rod 326 to remove seedling tray 2. S2: After the second rice-throwing tray 4 is removed upwards, the motor 312 drives the mounting block 311 to rotate clockwise. Under the guidance of the guide rod 315 and the adjusting block 316, the connecting rod 319, which is threaded onto the outer wall of the screw 313, moves the adjusting block 316 to the right. This causes the adjusting seat 317, which is fixedly connected to the upper part of the adjusting block 316, to move to the right simultaneously. Consequently, the support seat 321 moves to the right simultaneously, allowing the removed second rice-throwing tray 4 to be moved to the upper part of the moving base 2. This prevents the second rice-throwing tray 4 from being located outside the moving base 2 and accidentally colliding with external objects during transport, thus avoiding it falling off. This makes it easier to transport the removed second rice-throwing tray 4. Furthermore, when it is necessary to adjust the layering rod 3213... When adjusting the spacing, simply pull the connecting plate 3215 outward to drive the locking rod 3214, which will separate the locking rod 3214 from the adjusting groove 3211. Then, under the guidance of the sliding rod 329 and the slider 3210, the connecting seat 3212 and the layering rod 3213 can be adjusted, thereby adjusting the spacing of the layering rod 3213. This can meet the needs of different sizes of seedling trays 24 or other seedling trays. After the connecting seat 3212 and the layering rod 3213 are adjusted to the appropriate position, the locking rod 3214 is engaged with the corresponding adjusting groove 3211. Then, under the action of the spring 3216, the locking rod 3214 can be engaged with the adjusting groove 3211, thereby fixing the connecting seat 3212 and completing the adjustment operation of the spacing of the layering rod 3213. S3: When the second seedling tray 4 is transferred to a suitable position and needs to be stacked, simply insert the positioning block 6, which is fixedly connected to the bottom of the second seedling tray 4, into the positioning groove 5 to complete the stacking operation of the first seedling tray 1 and the second seedling tray 4. Since the bottom of the positioning block 6 has a guide angle, it is easier to align the positioning block 6 and the positioning groove 5, which makes it easier to stack the first seedling tray 1 and the second seedling tray 4.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stackable and storable rice seedling tray, comprising a rice seedling tray (1), characterized in that: The upper part of the seedling throwing tray 1 (1) is provided with seedling throwing tray 2 (4). Both seedling throwing tray 1 (1) and seedling throwing tray 2 (4) are fixedly connected with pull rods (7). Both seedling throwing tray 1 (1) and seedling throwing tray 2 (4) are provided with positioning grooves (5). The bottom of seedling throwing tray 2 (4) is fixedly connected with a positioning block (6). The bottom outer wall of the positioning block (6) is provided with a guide angle.

2. A quick-release device for a rice seedling tray, comprising a movable base (2) disposed on the right side of a rice seedling tray (1); And a connecting component (3) disposed on the upper part of the movable base (2), characterized in that: The connecting component (3) includes a transfer mechanism (31) disposed on the upper part of the movable base (2), and a pick-and-place mechanism (32) is disposed on the upper part of the movable base (2).

3. The rapid loading and unloading device for rice seedling trays according to claim 2, characterized in that: The transfer mechanism (31) includes a mounting block (311) fixedly installed at the bottom of the movable base (2). A motor (312) is fixedly installed on the outside of the mounting block (311) via a support. A lead screw (313) is fixedly connected to the output end of the motor (312). An adjustment hole (314) is opened on the upper part of the movable base (2). A guide rod (315) is fixedly connected to the inner wall of the adjustment hole (314). An adjustment block (316) is slidably connected to the outer wall of the guide rod (315). A connecting rod (319) is fixedly connected to the bottom of the adjustment block (316). An adjustment seat (317) is fixedly connected to the upper part of the adjustment block (316). A guide rail (318) is fixedly connected to the upper part of the movable base (2). An adjustment seat (317) is fixedly connected to the upper part of the adjustment block (316).

4. The rapid loading and unloading device for rice seedling trays according to claim 2, characterized in that: The picking and placing mechanism (32) includes a support base (321) fixedly installed on the upper part of the adjusting base (317). The surface of the support base (321) is provided with an adjusting hole (322). An adjusting rod (323) is fixedly connected to the inner wall of the adjusting hole (322). An adjusting block (324) is slidably connected to the outer wall of the adjusting rod (323). An installation rod (325) is fixedly connected to one side of the adjusting block (324). An electric telescopic rod (326) is fixedly installed on the top of the support base (321) through a fixed seat. An installation seat (327) is fixedly connected to the side of the adjusting block (324) away from the installation rod (325). The mounting base (327) has a sliding groove (328) on its outer side. A sliding rod (329) is fixedly connected to the inner wall of the sliding groove (328). A slider (3210) is slidably connected to the outer wall of the sliding rod (329). A connecting seat (3212) is fixedly connected to the outer side of the slider (3210). An adjustment groove (3211) is opened on the outer side of the mounting base (327). A locking rod (3214) is movably passed through the inside of the connecting seat (3212). A connecting plate (3215) is fixedly connected to the outer end of the locking rod (3214). A spring (3216) is fixedly connected to the outer side of the connecting seat (3212). A layered rod (3213) is fixedly connected to the outer side of the connecting seat (3212).

5. The rapid loading and unloading device for a rice seedling tray according to claim 3, characterized in that: The lead screw (313) is rotatably connected to the mounting block (311) via a bearing, the connecting rod (319) is threadedly connected to the outer wall of the lead screw (313), and the adjusting seat (317) is slidably connected to the outer wall of the guide rail (318).

6. The rapid loading and unloading device for rice seedling trays according to claim 4, characterized in that: The output end of the electric telescopic rod (326) is fixedly connected to the mounting rod (325), and the end of the layered rod (3213) is provided with a dividing plate slope.

7. The rapid loading and unloading device for a rice seedling tray according to claim 4, characterized in that: The locking rod (3214) is engaged with the adjusting groove (3211), and the outer end of the spring (3216) is fixedly connected to the connecting plate (3215).

8. A method for quickly picking up and placing rice seedling trays, comprising the following steps: S1: First, move the movable base (2) to the vicinity of the first (1) and the second (4) of the seedling throwing tray. Then, move the installation rod (325) and the adjustment block (324) by the electric telescopic rod (326) so that the height of the layering rod (3213) can be adjusted. Then, the seedling throwing trays of different heights can be picked up and put down. When the layering rod (3213) is adjusted to a suitable height and is located between the first (1) and the second (4) of the seedling throwing tray, push the movable base (2) inward so that the layering rod (3213) can be pushed between the first (1) and the second (4) of the seedling throwing tray. Since the end of the layering rod (3213) is inclined, the seedling throwing tray (1) and the second (4) of the seedling throwing tray can be separated. This can prevent the first (1) and the second (4) of the seedling throwing tray from being stuck. Then, move the installation rod (325) upward by the electric telescopic rod (326) so that the second (4) of the seedling throwing tray can be taken out upward. S2: When the second seedling tray (4) is taken out upward, the motor (312) drives the mounting block (311) to rotate clockwise. Under the guidance of the first guide rod (315) and the first adjusting block (316), the connecting rod (319) threaded on the outer wall of the screw (313) can drive the first adjusting block (316) to move to the right. This allows the adjusting seat (317) fixed on the upper part of the first adjusting block (316) to move to the right synchronously, and the support seat (321) to move to the right synchronously. This allows the second seedling tray (4) to be moved to the right synchronously, and the second seedling tray (4) to be moved to the upper part of the moving base (2). This prevents the second seedling tray (4) from being located outside the moving base (2) and accidentally colliding with external objects during the transfer process, causing the second seedling tray (4) to fall. This makes it easier to transfer the second seedling tray (4) that has been taken out. S3: When the second seedling tray (4) is transferred to a suitable position and needs to be stacked, simply insert the positioning block (6) fixedly connected to the bottom of the second seedling tray (4) into the positioning groove (5) to complete the stacking operation of the first seedling tray (1) and the second seedling tray (4). Since the bottom of the positioning block (6) is provided with a guide angle, it is easier to align the positioning block (6) and the positioning groove (5), which in turn makes it easier to stack the first seedling tray (1) and the second seedling tray (4).

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