Seedling planting pit digging device for artificial afforestation

Abstract

The invention relates to the technical field of forestry machinery, and discloses a seedling planting pit digging device for artificial afforestation, the seedling planting pit digging device comprises a moving frame, a pit drilling mechanism and a driving assembly, the pit drilling mechanism comprises a drill bit and a drill sleeve which can rotate synchronously, and the drill bit is provided with a core rod in sliding fit with the drill sleeve; a collecting cage is arranged on the drill bushing and comprises a plurality of edgings and a mounting plate for mounting the edgings, the edgings are arc-shaped strips arched outwards, the upper ends of the edgings are fixedly connected to the mounting plate, the lower ends of the edgings are detachably connected with the drill bit, and the bottom ends of the edgings are obliquely arranged inwards from the outer edge of the drill bit in the horizontal direction. The top ends of the edgings incline inwards from the outer edge of the mounting plate in the horizontal direction, and the distance between the adjacent edgings is gradually increased from the upper end and the lower end to the middle; a locking mechanism is arranged at the top of the drill bushing; and a lifting screw rod for driving the pit drilling mechanism to lift is also arranged on the movable frame. The invention aims to bring some broken stones in a pit out of the pit at the same time during pit digging, so that secondary operation is avoided, and the pit digging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of forestry machinery, and particularly relates to a seedling planting and hole digging device for artificial afforestation. BACKGROUND

[0002] Artificial afforestation is a process of forming a forest by planting seedlings or seeds on non-forest land using scientific methods through human measures, and is used to expand forest resources, improve the ecological environment, and maintain ecological balance. During the planting process of the seedlings, holes are first dug in the land, then trees are planted, and the soil is backfilled and watered. The hole digging is the most labor-intensive work in the planting process. Therefore, a hole digging device is needed to facilitate hole digging in the land, greatly reducing the labor intensity of the workers, and the depth and width of the hole digging can be accurately controlled to ensure that the seedlings are planted at the best position and depth. In the afforestation planting and hole digging process, a spiral hole digging drill bit in the hole digging device is used to effectively cut and break the soil during hole digging, and the dug soil can be taken out in time. In addition, since there may be some stones in the soil pit, the stones are generally hard and heavy in quality, so it is difficult for the stones to be thrown out of the soil pit along with the soil. This results in some stones remaining in the pit after the hole digging is completed, and an additional step is needed to handle the stones in the pit, greatly reducing the efficiency of the entire planting and hole digging process.

[0003] In view of the above-mentioned defects in the prior art, the present application is developed through in-depth research. SUMMARY

[0004] The purpose of the present application is to provide a seedling planting and hole digging device for artificial afforestation, which can simultaneously take out some stones in the seedling pit from the soil pit during hole digging, avoid secondary operation, and improve the efficiency of hole digging.

[0005] To achieve the above technical purposes, the technical solutions adopted by the present application are as follows:

[0006] The utility model provides a kind of afforestation seedling planting hole digging device, including moving frame, the hole drilling mechanism of being movably installed on moving frame and the drive assembly of driving hole drilling mechanism rotation, the hole drilling mechanism includes the drill bit and the drill bushing of synchronous rotation, the drill bit is equipped with the core rod of the sliding fit with the drill bushing;The drill bushing is equipped with the collection cage that can be collected to gravel and soil, the collection cage includes multiple edge strips along the axis annular array of drill bushing and the mounting plate of installing edge strip, the edge strip is the arc strip of outward arch, the upper end of edge strip is fixedly connected on the mounting plate, lower end is detachably connected with the drill bit, the bottom end of edge strip is inwardly inclined in horizontal direction by the outer edge of drill bit, the top end of edge strip is inwardly inclined in horizontal direction by the outer edge of mounting plate, and the spacing between adjacent edge strips gradually increases from top and bottom to middle;The top of drill bushing is equipped with the locking mechanism that is axially locked to the core rod, the spline section of being equipped with the sliding fit with the drill bushing is arranged on the core rod, and the key groove of the sliding fit with the spline section is formed in the bottom of drill bushing;Lifting screw is further equipped on the moving frame and drives hole drilling mechanism to go up and down.

[0007] Further, the bottom end of the edge strip is provided with an insertion block, and the top of the drill bit is formed with an insertion slot matched with the insertion block; a stop block movably arranged in the insertion slot is provided with a first return spring connected to the bottom of the stop block. The stop block can prevent soil from falling into the insertion slot.

[0008] Further, the top of the drill bit is formed with an upwardly arched flow guide surface, and the insertion slot is located outside the flow guide surface. The flow guide surface makes it easier for soil and stones to slide out.

[0009] Further, the locking mechanism includes a locking member slidably arranged on the drill bushing and a second return spring, the locking member includes a sliding seat, a locking block located at the top of the front end of the sliding seat, and a push block located at the tail end of the sliding seat; the top of the drill bushing is formed with a sliding groove for the sliding seat, the top of the core rod is formed with a limiting head, and the drill bushing is formed with a limiting step matched with the limiting head; the sidewall of the limiting head is formed with a locking groove matched with the locking block; one end of the second return spring is fixedly connected to the sliding seat, and the other end is fixedly connected to the sidewall away from the core rod of the sliding groove. The locking mechanism can quickly unlock or lock the core rod.

[0010] Further, the two sides of the sliding seat are provided with limiting blocks; the two sides of the sliding groove are formed with limiting grooves slidably matched with the limiting blocks; the top of the limiting head is formed with a first guide inclined surface corresponding to the locking groove; the bottom of the locking block is formed with a second guide inclined surface matched with the first guide inclined surface. The first guide inclined surface and the second guide inclined surface can be matched to automatically lock the core rod by the locking mechanism.

[0011] Furthermore, the movable frame includes an upper support plate and a lower support frame. The bottom of the support plate has multiple guide sleeves, and the support frame has multiple guide rods that slide in conjunction with the guide sleeves. The outer side of the support frame has a mounting sleeve for mounting the lifting screw, and one side of the support plate has a threaded sleeve that threads with the lifting screw. The bottom of the lifting screw rotatably engages with the mounting sleeve, and the top of the lifting screw has a rotating handwheel. The drilling mechanism is rotatably mounted on the support plate, and the drill sleeve has a rotating ring that rotatably connects to the support plate. The lifting screw allows for stable movement of the support plate, thereby ensuring stable movement of the drilling mechanism.

[0012] Furthermore, the drive assembly includes a motor fixedly mounted on the support plate, a first synchronous pulley fixedly sleeved on the motor output shaft, a second synchronous pulley fixedly sleeved on the drill bushing, and a synchronous belt sleeved on the first and second synchronous pulleys; the support plate is also provided with a protective box covering the first and second synchronous pulleys, with the top of the drill bushing passing through the top of the protective box. The protective box can protect the drive assembly.

[0013] Furthermore, the support frame is also equipped with multiple sets of movable wheel sets; each movable wheel set includes rollers, a support shaft, and a damping spring; mounting seats for mounting the movable wheel sets are formed on both sides of the support frame, and mounting grooves are formed on the outer sides of the mounting seats. A limiting rod is provided within the mounting groove, and a slider with a sliding fit to the mounting groove is formed at one end of the support shaft. A sliding hole with a fit to the limiting rod is formed on the slider; the damping spring is sleeved on the limiting rod, with its lower end fixedly connected to the top of the slider and its upper end fixedly connected to the inner top wall of the mounting groove. The movable wheel sets allow the entire digging device to adapt to complex terrain in woodlands.

[0014] Furthermore, the support plate is also provided with a handle. The handle facilitates the movement of the device.

[0015] With the above structure, the present invention relates to a seedling planting pit digging device for artificial afforestation. Compared with the prior art, this invention sets a core rod at the top of the drill bit, which is slidably connected to the drill sleeve. The drill bit can rotate synchronously with the drill sleeve. A collection cage is fixed on the drill sleeve. The side strips of the collection cage are arc-shaped and inclined. During the drilling process, the drill bit pre-drills the soil and the stones inside, and performs a preliminary crushing and cracking of the soil. During the downward pressing process, the side strips of the collection cage also cut the soil, so that the soil and some stones can be carried into the collection cage along the side strips. After the pit is completed, the drilling mechanism is raised and moved to the side of the seedling pit. The connection between the core rod and the drill sleeve is released by the locking mechanism, and the drill bit is lowered. At this time, the bottom of the collection cage is opened, and the soil and stones inside can slide out. In this way, the pit can be dug in one go, avoiding secondary operations and improving the efficiency of pit digging. Attached Figure Description

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the decomposed structure;

[0019] Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0020] Figure 4 for Figure 2 A magnified view of the structure at point B in the middle;

[0021] Figure 5 This is a schematic diagram of the drilling mechanism in this invention;

[0022] Figure 6 for Figure 5 A cross-sectional schematic diagram;

[0023] Figure 7 for Figure 5 A magnified schematic diagram of the local structure at point C;

[0024] Figure 8 for Figure 6 A magnified schematic diagram of the local structure at point D;

[0025] Figure 9 This is a schematic diagram of the structure when the drill bit and drill sleeve are separated in this invention;

[0026] Figure 10 This is a schematic diagram of the structure of the drill sleeve and the collection cage in this invention;

[0027] Figure 11 This is a schematic diagram of the drill bit structure in this invention;

[0028] Figure 12 for Figure 11 A magnified schematic diagram of the local structure at point E;

[0029] Figure 13 for Figure 11 A magnified schematic diagram of the local structure at point F;

[0030] Figure 14 This is a schematic diagram of the locking component in this invention.

[0031] Reference numerals: 1. Moving frame; 11. Bearing plate; 11. Guide sleeve; 111. Threaded sleeve; 112. Handle; 113. Bearing frame; 12. Guide rod; 121. Mounting sleeve; 2. Drilling mechanism; 21. Drill bit; 211. Core rod; 2111. Limiting head; 2112. Locking groove; 2112. First guide slope; 2113. Spline section; 212. Insertion groove; 213. Guide surface; 214. Drill sleeve; 22. Keyway; 221. Slide groove; 222. Limiting groove; 2221. Rotating ring; 223. Collection cage; 23. Edge strip; 231. Insertion block; 2311. Mounting plate; 23. 2. Drive assembly 3. Motor 31. First synchronous pulley 32. Second synchronous pulley 33. Synchronous belt 34. Protective box 35. Locking mechanism 4. Locking component 41. Slide 411. Locking block 412. Second guide slope 4121. Pulley 413. Limiting block 414. Second return spring 42. Lifting screw 5. Rotary handwheel 51. Stop block 6. First return spring 61. Moving wheel set 7. Roller 71. Bearing shaft 72. Slider 721. Sliding hole 722. Damping spring 73. Mounting seat 8. Mounting groove 81. Limiting rod 811. Detailed Implementation

[0032] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0034] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] like Figures 1-14As shown, this invention relates to a seedling planting hole-digging device for artificial afforestation, comprising a movable frame 1, a drilling mechanism 2 movably mounted on the movable frame 1, and a drive assembly 3 for driving the drilling mechanism 2 to rotate. The drilling mechanism 2 includes a drill bit 21 and a drill sleeve 22 that can rotate synchronously. The drill bit 21 is provided with a core rod 211 that slides with the drill sleeve 22, and the drill sleeve 22 has a through hole for the core rod 211 to pass through. The drill sleeve 22 is provided with a collection cage 23 for collecting gravel and soil, and the collection cage 23 can follow the drill. The sleeve 22 rotates synchronously. Specifically, the collection cage 23 includes multiple side strips 231 arranged in a ring along the axis of the drill sleeve 22, and a mounting plate 232 for mounting the side strips 231. The side strips 231 are outwardly arched arc-shaped strips. The overall diameter of the collection cage 23 gradually increases and then gradually decreases from top to bottom. The upper end of the side strip 231 is fixedly connected to the mounting plate 232, and the lower end is detachably connected to the drill bit 21. The bottom end of the side strip 231 is inclined inward from the outer edge of the drill bit 21 in the horizontal direction. The top edge of the mounting plate 232 is horizontally inclined inwards from its outer edge, and the spacing between adjacent side strips 231 gradually increases from the top and bottom ends towards the middle. The width of the side strips 231 is about 6-8 cm, and the bottom ends of adjacent side strips 231 partially overlap. The side strips 231 can be made of alloy steel, and the top of the side strips 231 can be welded or bolted to the mounting plate 232. When the collection cage 23 rotates with the drill sleeve 22, the side strips 231 continuously cut the soil, causing the soil to... The stones enter the collection cage 23 along the gaps between the edge strips 231; a locking mechanism 4 is provided at the top of the drill sleeve 22 to lock the core rod 211 axially, the core rod 211 is provided with a spline section 212 that slides with the drill sleeve 22, and a keyway 221 is formed at the bottom of the drill sleeve 22 that slides with the spline section 212. The engagement of the spline section 212 and the keyway 221 can keep the drill bit 21 and the drill sleeve 22 rotating synchronously; in addition, a lifting screw 5 is provided on the moving frame 1 to drive the drilling mechanism 2 to move up and down.

[0036] In this embodiment, the bottom end of the edge strip 231 is provided with a plug-in block 2311, and the top of the drill bit 21 is formed with a plug-in groove 213 that mates with the plug-in block 2311. The mating of the plug-in block 2311 and the plug-in groove 213 can enhance the connection strength of the collection cage 23. In addition, to prevent the slipped soil from falling into the plug-in groove 213, a stop block 6 is movably provided in the plug-in groove 213, and the bottom of the stop block 6 is connected to a first return spring 61. When the drill bit 21 separates from the collection cage 23, the stop block 6 is pushed to the upper surface of the drill bit 21 under the action of the first return spring 61, sealing the opening of the plug-in groove 213.

[0037] In order to make it easier for the soil and rocks to slide off and avoid them from sticking to the top of the drill bit 21, an upwardly arched guide surface 214 is formed on the top of the drill bit 21 to accelerate the efficiency of soil and rocks sliding off; in addition, the insertion groove 213 is located outside the guide surface 214.

[0038] In this embodiment, the locking mechanism 4 includes a locking member 41 slidably mounted on the drill sleeve 22 and a second return spring 42. The locking member 41 includes a slide block 411, a locking block 412 located at the top front end of the slide block 411, and a lever block 413 located on both sides of the tail end of the slide block 411. A sliding groove 222 for sliding the slide block 411 is formed on the top of the drill sleeve 22, and a limiting block 414 is provided on both sides of the slide block 411. A limiting groove 2221 that slides and engages with the limiting block 414 is formed on both sides of the sliding groove 222. A limiting head 2111 is formed on the top of the core rod 211, and a limiting step that engages with the limiting head 2111 is formed inside the drill sleeve 22. A locking groove 2112 that engages with the locking block 412 is formed on the side wall of the limiting head 2111. One end of the second return spring 42 is fixedly connected to the slide block 411, and the other end is fixedly connected to the side wall of the sliding groove 222 away from the core rod 211. The second return spring 42 holds the locking member 41 against the locking groove 2112. The locking block 412 and the locking groove 2112 cooperate to prevent the core rod 211 from sliding down. When the core rod 211 needs to slide down, simply pull the lever 413 to pull the locking member 41 backward out of the locking groove 2112. In addition, in order to enable the locking mechanism 4 to automatically lock and limit the core rod 211, a first guide slope 2113 corresponding to the locking groove 2112 is formed on the top of the limiting head 2111; the locking block 412... The bottom of 12 has a second guide slope 4121 that can cooperate with the first guide slope 2113. When it is necessary to lock the core rod 211 again, the drill sleeve 22 moves downward under the action of the lifting screw 5. At this time, the core rod 211 moves upward relative to the drill sleeve 22. Under the action of the first guide slope 2113 and the second guide slope 4121, the locking member 41 retracts until the locking groove 2112 corresponds with the locking member 41. Then, under the action of the second return spring 42, the locking member 41 is locked into the locking groove 2112 again.

[0039] In this embodiment, the movable frame 1 includes a support plate 11 located above and a support frame 12 located below. The bottom of the support plate 11 is provided with multiple guide sleeves 111, and the support frame 12 is provided with multiple guide rods 121 that slide in cooperation with the guide sleeves 111. The support plate 11 is a square plate, and the support frame 12 is a square frame. There are four guide sleeves 111 and four guide rods 121, each located at one of the four corners. A handle 113 is also provided on the support plate 11 to facilitate the movement of the entire device. An mounting sleeve 122 for mounting a lifting screw 5 is provided on the outside of the support frame 12. A threaded sleeve 112 that threadedly engages with the lifting screw 5 is provided on one side of the support plate 11. The bottom of the lifting screw 5 rotatably engages with the mounting sleeve 122, and a rotating handwheel 51 is provided on the top of the lifting screw 5. The drilling mechanism 2 is rotatably mounted on the support plate 11, and a rotating ring 223 that rotatably connects to the support plate 11 is provided on the drilling sleeve 22. The lifting screw 5 can control the stable movement of the support plate 11, thereby enabling the stable movement of the drilling mechanism 2.

[0040] In this embodiment, the drive assembly 3 includes a motor 31 fixedly mounted on a support plate 11, a first synchronous pulley 32 fixedly sleeved on the output shaft of the motor 31, a second synchronous pulley 33 fixedly sleeved on the drill sleeve 22, and a synchronous belt 34 sleeved on the first synchronous pulley 32 and the second synchronous pulley 33. Specifically, the motor 31 is fixedly mounted on the bottom of the support plate 11, and the output shaft passes through the support plate 11. The support plate 11 is also provided with a protective box 35 covering the first synchronous pulley 32 and the second synchronous pulley 33, and the top of the drill sleeve 22 passes through the top of the protective box 35. The protective box 35 can protect the drive assembly 3.

[0041] Alternatively, the drilling mechanism 2 can be gear driven, with a driving gear fixedly mounted on the output shaft of the motor 31 and a driven gear fixedly mounted on the drill sleeve 22, the driving gear and the driven gear meshing together.

[0042] In this embodiment, the support frame 12 is also provided with multiple sets of movable wheel sets 7; each movable wheel set 7 includes a roller 71, a support shaft 72, and a damping spring 73; mounting seats 8 are formed on both sides of the support frame 12 for mounting the movable wheel sets 7, and mounting grooves 81 are formed on the outer side of the mounting seats 8. A limiting rod 811 is provided in the mounting groove 81. A slider 721 is formed at one end of the support shaft 72, which slides in cooperation with the mounting groove 81. A sliding hole 722 is formed on the slider 721, which cooperates with the limiting rod 811; the damping spring 73 is sleeved on the limiting rod 811, and the lower end of the damping spring 73 is fixedly connected to the top of the slider 721, while the upper end is fixedly connected to the inner top wall of the mounting groove 81. The movable wheel sets 7 allow the entire digging device to adapt to the complex terrain in the forest.

[0043] The method of using this invention is as follows: First, push the device to a suitable planting position. Then, start the motor 31, which drives the drilling mechanism 2 to rotate under the action of the drive component 3. Then, control the lifting screw 5 to rotate by rotating the handwheel 51, driving the bearing plate 11 to move downward, thereby driving the drilling mechanism 2 to move downward. During the drilling process, the drill bit 21 first pre-drills the soil, performing a preliminary cracking of the soil. As the drill bit 21 continues to drill downward, the side strips 231 of the collection cage 23 can continue to cut the soil, collecting the scattered soil and stones in the pit into the collection cage 23. After drilling the pit, turn off the motor 31, and lift the drill bit 21 upward again by using the lifting screw 5, moving the drill bit 21 away from the ground. Then, place the device... Push the soil towards the edge of the pit, then pull the locking member 41 backward, causing the drill bit 21 to slide down. At this time, the drill bit 21 disengages from the bottom of the collection cage 23, thereby opening the collection cage 23 and allowing the soil and stones inside the collection cage 23 to slide down out of the collection cage 23. Then, drive the bearing plate 11 to descend again through the lifting screw 5. During the descent, the core rod 211 gradually returns to its original position, and under the action of the first guide inclined surface 2113 and the second guide inclined surface 4121, the locking member 41 retracts until the locking groove 2112 corresponds with the locking member 41. Then, under the action of the second return spring 42, the locking member 41 is locked back into the locking groove 2112. Finally, lift the bearing plate 11 again through the lifting screw 5 and move it to the next planting point to repeat the above operation.

[0044] The above provides a detailed description of a seedling planting pit digging device for artificial afforestation provided by the present invention. The specific embodiments described are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A seedling planting hole-digging device for artificial afforestation, comprising a movable frame (1), a drilling mechanism (2) movably mounted on the movable frame (1), and a drive assembly (3) for driving the drilling mechanism (2) to rotate, characterized in that: The drilling mechanism (2) includes a drill bit (21) that can rotate synchronously and a drill sleeve (22). The drill bit (21) is provided with a core rod (211) that slides with the drill sleeve (22). The drill sleeve (22) is provided with a collection cage (23) that can collect gravel and soil. The collection cage (23) includes multiple side strips (231) arranged in a ring along the axis of the drill sleeve (22) and a mounting plate (232) for mounting the side strips. The side strips (231) are outwardly arched arc strips. The upper end of the side strips (231) is fixedly connected to the mounting plate (232), and the lower end is detachably connected to the drill bit (21). The bottom end of the side strips (231) is horizontal. The drill bit (21) is inclined inward from the outer edge of the drill bit (21). The top of the edge strip (231) is inclined inward from the outer edge of the mounting plate (232) in the horizontal direction, and the distance between adjacent edge strips (231) gradually increases from the upper and lower ends to the middle. The top of the drill sleeve (22) is provided with a locking mechanism (4) for locking the core rod (211) in the axial direction. The core rod (211) is provided with a spline section (212) that slides with the drill sleeve (22). The bottom of the drill sleeve (22) is formed with a keyway (221) that slides with the spline section (212). The moving frame (1) is also provided with a lifting screw (5) that drives the drilling mechanism (2) to move up and down.

2. The seedling planting pit digging device for artificial afforestation according to claim 1, characterized in that: The bottom end of the edge strip (231) is provided with a plug-in block (2311), and the top of the drill bit (21) is formed with a plug-in groove (213) that cooperates with the plug-in block (2311); a stop block (6) is movably provided in the plug-in groove (213), and a first return spring (61) is connected to the bottom of the stop block (6).

3. The seedling planting pit digging device for artificial afforestation according to claim 2, characterized in that: The top of the drill bit (21) has an upwardly arched guide surface (214), and the insertion slot (213) is located outside the guide surface (214).

4. The seedling planting pit digging device for artificial afforestation according to claim 3, characterized in that: The locking mechanism (4) includes a locking member (41) slidably mounted on the drill sleeve (22) and a second return spring (42). The locking member (41) includes a slide (411), a locking block (412) located at the top front end of the slide (411), and paddle blocks (413) located on both sides of the tail end of the slide (411). A sliding groove (222) for sliding of the slide (411) is formed on the top of the drill sleeve (22). A limiting head (2111) is formed on the top of the core rod (211). A limiting step that cooperates with the limiting head (2111) is formed inside the drill sleeve (22). A locking groove (2112) that cooperates with the locking block (412) is formed on the side wall of the limiting head (2111). One end of the second return spring (42) is fixedly connected to the slide (411), and the other end is fixedly connected to the side wall of the sliding groove (222) away from the core rod (211).

5. The seedling planting pit digging device for artificial afforestation according to claim 4, characterized in that: The slide block (411) is provided with limiting blocks (414) on both sides; the slide groove (222) is formed with limiting grooves (2221) on both sides that slide with the limiting blocks (414); the top of the limiting head (2111) is formed with a first guide slope (2113) corresponding to the locking groove (2112); the bottom of the locking block (412) is formed with a second guide slope (4121) that can cooperate with the first guide slope (2113).

6. The seedling planting pit digging device for artificial afforestation according to claim 1, characterized in that: The movable frame (1) includes a support plate (11) located above and a support frame (12) located below. The bottom of the support plate (11) is provided with multiple guide sleeves (111), and the support frame (12) is provided with multiple guide rods (121) that slide with the guide sleeves (111). The outer side of the support frame (12) is provided with an mounting sleeve (122) for mounting the lifting screw (5). One side of the support plate (11) is provided with a threaded sleeve (112) that is threaded with the lifting screw (5). The bottom of the lifting screw (5) is rotatably engaged with the mounting sleeve (122), and the top of the lifting screw (5) is provided with a rotating handwheel (51). The drilling mechanism (2) is rotatably mounted on the support plate (11), and the drilling sleeve (22) is provided with a rotating ring (223) that is rotatably connected to the support plate (11).

7. The seedling planting pit digging device for artificial afforestation according to claim 6, characterized in that: The drive assembly (3) includes a motor (31) fixedly mounted on the support plate (11), a first synchronous pulley (32) fixedly sleeved on the output shaft of the motor (31), a second synchronous pulley (33) fixedly sleeved on the drill bushing (22), and a synchronous belt (34) sleeved on the first synchronous pulley (32) and the second synchronous pulley (33); the support plate (11) is also provided with a protective box (35) covering the first synchronous pulley (32) and the second synchronous pulley (33), and the top of the drill bushing (22) passes through the top of the protective box (35).

8. The seedling planting pit digging device for artificial afforestation according to claim 7, characterized in that: The support frame (12) is also provided with multiple sets of movable wheel sets (7); the movable wheel set (7) includes a roller (71), a support shaft (72) and a damping spring (73); the support frame (12) is also provided with mounting seats (8) on both sides for mounting the movable wheel sets (7), the outer side of the mounting seat (8) is provided with a mounting groove (81), the mounting groove (81) is provided with a limiting rod (811), one end of the support shaft (72) is provided with a slider (721) that slides with the mounting groove (81), the slider (721) is provided with a sliding hole (722) that cooperates with the limiting rod (811); the damping spring (73) is sleeved on the limiting rod (811), the lower end of the damping spring (73) is fixedly connected to the top of the slider (721), and the upper end is fixedly connected to the inner top wall of the mounting groove (81).

9. The seedling planting pit digging device for artificial afforestation according to claim 8, characterized in that: The support plate (11) is also provided with a handle (113).

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