Adjustable pit digging device for arbor planting

Abstract

The invention discloses an adjustable hole digging device for arbor planting, and relates to the technical field of agricultural planting, the adjustable hole digging device comprises a connecting mechanism, a lifting mechanism, a motor base, a drill rod and a spiral drill bit, a motor is mounted on the motor base, and a motor shaft of the motor is in driving connection with the drill rod; the mounting sleeve is fixedly connected below the motor base, two swing arms are hinged to the periphery of the mounting sleeve, and the ends, away from the mounting sleeve, of the swing arms are connected with scraping plates; the driving mechanism is arranged on the periphery of the mounting sleeve and used for driving the two swing arms to swing on the horizontal plane. According to the device, when the drill rod rotates, the spiral drill bit drills into the ground so as to form a planting pit in the ground, and when soil in the planting pit is taken away to the ground surface along the surface of the spiral drill bit, the driving mechanism drives the two swing arms to move synchronously, so that the scraper plate gathers the planting soil dispersed on the ground surface to one place; furthermore, the planting soil can be accumulated at one position of the ground surface, so that the planting soil can be conveniently backfilled into the planting pit by a subsequent worker, and the planting efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural planting, and particularly to an adjustable tree-planting pit-digging device. Background Technique

[0002] A tree is a tall tree with an independent main trunk growing from the root, and there is a distinct distinction between the trunk and the crown. A woody plant with an upright main trunk and usually reaching a height of six to dozens of meters is called a tree. It often has a tall and large tree body with an obvious tall main trunk. It can also be divided into four levels according to its height: giant tree (above 31 meters), large tree (21 - 30 meters), medium tree (11 - 20 meters), and small tree (6 - 10 meters). Trees correspond to low shrubs, and the tall trees commonly seen are usually trees, such as kapok, pine, magnolia, and birch. Trees are also divided into deciduous trees and evergreen trees according to whether they shed leaves in winter or the dry season.

[0003] When planting trees, it is necessary to use a pit-digging instrument to dig a planting pit on the ground, then put the tree seedlings into the dug planting pit, and then backfill the soil taken from the ground when digging the planting pit into the planting pit. After retrieval, a depth-adjustable pit-digging device for seedling planting disclosed in the Chinese Utility Model Patent Publication No. CN217985935U includes a device base, a fixed base is arranged on the device base, a driving box is arranged on the fixed base, and further includes: an adjustment mechanism, one end of the adjustment mechanism is connected to an adjustment base, and one end of the adjustment base is slidably connected to the fixed base; a depth display mechanism, one end of the depth display mechanism is connected to the adjustment base; a pit-digging mechanism, and the pit-digging mechanism is arranged on the adjustment base.

[0004] When the above-mentioned existing pit-digging device digs a planting pit, it drills into the ground through a spiral pit-digging drill bit, and then drills a planting pit on the ground. When the pit-digging drill bit drills the planting pit, the soil in the planting pit will be taken away from the planting pit along the surface of the spiral pit-digging drill bit and scattered on the ground surface. Since the soil in the planting pit is scattered on the ground surface and is relatively dispersed, when backfilling the soil later, workers need to spend a long time gathering the scattered planting soil on the ground surface and then backfilling the planting soil into the planting pit. This method results in low planting efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide an adjustable tree-planting pit-digging device to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: An adjustable tree-planting pit-digging device includes: A connection mechanism, and a lifting mechanism is arranged on the connection mechanism; Drive the motor base connected to the lifting mechanism. A drill pipe is vertically rotatably connected to the motor base. A spiral drill bit is fixedly sleeved on the periphery of the drill pipe. A motor is installed on the motor base, and the motor shaft of the motor is drivingly connected to the drill pipe; An installation sleeve fixedly connected to the lower part of the motor base through a plurality of tie rods. Two swing arms are hinged to the periphery of the installation sleeve, and a scraper is connected to one end of the swing arm away from the installation sleeve; A driving mechanism provided on the periphery of the installation sleeve, and the driving mechanism is used to drive the two swing arms to swing in a horizontal plane.

[0007] Through the above technical solution, when the drill pipe rotates, the spiral drill bit drills into the ground to form a planting pit on the ground. When the soil in the planting pit is carried away to the ground surface along the surface of the spiral drill bit, the driving mechanism drives the two swing arms to move synchronously, so that the scraper gathers the planting soil scattered on the ground surface to one place, so that the planting soil can be piled up at one place on the ground surface, which is convenient for the subsequent staff to backfill the planting soil into the planting pit, thereby improving the planting efficiency.

[0008] Further, the connecting mechanism includes a vehicle connecting seat. One end of the vehicle connecting seat is fixedly connected with a fixing plate. A plurality of columns are vertically slidably penetrated through the outer wall of the fixing plate, and the lower ends of the columns are fixedly connected to the motor base.

[0009] Through the above technical solution, the vehicle connecting seat is connected to an external vehicle, so that when the vehicle moves, it can drive the vehicle connecting seat to move synchronously, so that the spiral drill bit can drill holes at different positions.

[0010] Further, the lifting mechanism includes a lifting cylinder installed on the motor base, and the cylinder rod of the lifting cylinder is fixedly connected to the fixing plate.

[0011] Through the above technical solution, the telescopic cylinder rod of the lifting cylinder can drive the motor base to move up and down, so that the spiral drill bit can drill holes on the ground surface.

[0012] Further, the diameter of the spiral drill bit decreases successively from top to bottom.

[0013] Through the above technical solution, the resistance during the drilling of the spiral drill bit is reduced, so that the spiral drill bit can smoothly drill into the ground soil.

[0014] Further, the driving mechanism includes an installation arm fixedly connected to the periphery of the installation sleeve. A translation cylinder is installed at one end of the installation arm away from the installation sleeve. The cylinder rod of the translation cylinder is fixedly connected with a movable hinge seat. An avoidance groove for the free passage of the movable hinge seat is opened on the outer wall of the installation arm. A hinge rod is hinged on each side of the movable hinge seat, and the end of the hinge rod away from the movable hinge seat is correspondingly hinged to the swing arm.

[0015] Through the above technical solution, the cylinder rod of the translation cylinder extends, thereby driving the movable hinge seat to move towards the installation sleeve, and further enabling the hinge rod to drive the swing arm to swing. When the swing arm swings, the scraper can swing around the rotation fulcrum of the swing arm on the installation sleeve.

[0016] Furthermore, the two swing arms are symmetrically arranged along the axial direction of the installation sleeve.

[0017] Through the above technical solution, the two scrapers can evenly scrape the planting soil scattered on the ground to one place.

[0018] Furthermore, a reset cylinder is vertically installed at one end of the swing arm away from the installation sleeve. The cylinder rod of the reset cylinder is fixedly connected with a mounting plate, and a floating mechanism is arranged on the mounting plate. The floating mechanism is connected with the scraper.

[0019] Through the above technical solution, the reset cylinder drives the floating mechanism to move up and down, so that the extrusion force of the scraper on the ground can be adjusted. That is, when the extending length of the cylinder rod of the reset cylinder increases, the extrusion force of the scraper on the ground increases, and further the scraper can gather the fine soil on the ground. When the extending length decreases, the extrusion force of the scraper on the ground decreases, and further when the scraper resets, it will not scrape the ground.

[0020] Furthermore, the floating mechanism includes two sliding rods vertically and slidably passing through the mounting plate. The lower ends of the sliding rods are fixedly connected to the scraper. The opposite surfaces of two adjacent scrapers are in sliding contact. Springs are wound around the sliding rods, and the two ends of the springs in the direction of the spring force elastically abut against the mounting plate and the scraper respectively. A reciprocating lifting unit is arranged on the periphery of the installation sleeve, and the reciprocating lifting unit is used to drive the two adjacent sliding rods to move synchronously and in opposite directions when the swing arm rotates.

[0021] Through the above technical solution, when the cylinder rod of the reset cylinder extends, the compression degree of the spring by the mounting plate will increase, and further the extrusion force of the scraper on the ground will increase.

[0022] Furthermore, the cross section of the sliding rod is rectangular.

[0023] Through the above technical solution, the sliding rod is not prone to deflection.

[0024] Furthermore, the reciprocating lifting unit includes a sliding pin horizontally and fixedly connected to the outer wall of the sliding rod facing the mounting sleeve. A fixing ring is connected to the outer wall of the mounting sleeve, and an arc plate is coaxially and fixedly connected to the periphery of the fixing ring. The axis of the arc plate is coaxial with the rotation axis of the swing arm. A sliding groove that is connected end to end in sequence is formed on the periphery of the arc plate, and the sliding pin is slidably engaged in the sliding groove.

[0025] Through the above technical solution, when the swing arm swings, it will cause the sliding pin to slide in the sliding groove, thereby causing the adjacent two sliding rods to move, and making the two sliding rods move in an up-and-down state, and further making the adjacent two scrapers move up and down, so as to produce a cutting effect on the planting soil on the ground surface, and further pulverize the harder planting soil, which is convenient for subsequent backfilling work.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, when the drill rod rotates, the spiral drill bit drills into the ground to form a planting pit on the ground. When the soil in the planting pit is taken away along the surface of the spiral drill bit to the ground surface, the driving mechanism drives the two swing arms to move synchronously, and then the scraper gathers the planting soil scattered on the ground surface to one place, so that the planting soil can be piled up at one place on the ground surface, which is convenient for subsequent workers to backfill the planting soil into the planting pit, thereby improving the planting efficiency; 2. In the present invention, the floating mechanism is driven by the reset cylinder to move up and down, so that the extrusion force between the scraper and the ground surface can be adjusted. That is, when the extension length of the cylinder rod of the reset cylinder increases, the extrusion force of the scraper on the ground surface increases, and then the scraper can gather the fine soil on the ground surface. When the extension length decreases, the extrusion force of the scraper on the ground surface decreases, so that when the scraper resets, it will not scrape the ground surface; 3. In the present invention, when the swing arm swings, it will cause the sliding pin to slide in the sliding groove, thereby causing the adjacent two sliding rods to move, and making the two sliding rods move in an up-and-down state, and further making the adjacent two scrapers move up and down, so as to produce a cutting effect on the planting soil on the ground surface, and further pulverize the harder planting soil, which is convenient for subsequent backfilling work. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the overall structure of an adjustable tree planting pit digging device in the present invention; Figure 2 It is Figure 1 a schematic diagram of the positional relationship from the first perspective in Figure 3 It is Figure 2 a partially enlarged schematic diagram of the local structure at A in Figure 4 It is Figure 1Schematic diagram of the positional relationship of the second perspective in Figure 5 Schematic diagram of the positional relationship after the installation sleeve, installation arm and translation cylinder in the present invention are assembled; Figure 6 For Figure 5 Schematic diagram of the positional relationship of another perspective in Figure 7 For Figure 6 Enlarged schematic diagram of the local structure at B in Figure 8 Schematic diagram of the positional relationship after the scraper and sliding rod in the present invention are assembled.

[0028] In the figure, the explanations of each reference numeral are as follows: 1, vehicle connecting seat; 2, fixed plate; 3, column; 4, lifting cylinder; 5, motor; 6, motor seat; 7, drill pipe; 8, installation sleeve; 9, scraper; 10, spiral drill bit; 11, translation cylinder; 12, reset cylinder; 13, connecting plate; 14, sliding pin; 15, arc plate; 16, sliding groove; 17, sliding rod; 18, spring; 19, mounting plate; 20, swing arm; 21, installation arm; 22, hinge rod; 23, movable hinge seat; 24, clearance groove. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figure 1 - Figure 8, the present invention provides a technical solution: an adjustable tree-planting pit-digging device, including a vehicle connection seat 1, which is connected to an external movable vehicle by screws, such as a tractor, so that when the vehicle moves, it can drive the vehicle connection seat 1 to move synchronously. One end of the vehicle connection seat 1 is welded and installed with a fixing plate 2. Two vertical columns 3 are vertically penetrated through the upper and lower outer walls of the fixing plate 2. The two vertical columns 3 are located on opposite sides of the fixing plate 2 respectively, and the vertical columns 3 can slide up and down freely on the fixing plate 2. The lower ends of the two vertical columns 3 are fixedly connected together with a motor seat 6. A motor 5 is installed on the motor seat 6. The motor shaft of the motor 5 is driven and connected with a drill rod 7 through a coupling. When the motor shaft of the motor 5 rotates, it can drive the drill rod 7 to rotate. In addition, a spiral drill bit 10 is fixedly sleeved on the periphery of the drill rod 7. The overall contour of the spiral drill bit 10 is similar to that of a common spiral auger. A pointed block is welded at the lower end of the drill rod 7 so that the drill rod 7 can be inserted into the ground. In addition, the diameter of the spiral drill bit 10 decreases successively from top to bottom, so that the spiral drill bit 10 can penetrate into the ground more smoothly; A lifting cylinder 4 is installed on one side outer wall of the motor seat 6. The end of the cylinder rod of the lifting cylinder 4 is welded with a welding plate, and the welding plate is welded with the fixing plate 2, so that when the cylinder rod of the lifting cylinder 4 extends and retracts, it can drive the motor seat 6 to move up and down. Two pull rods are vertically welded at the bottom of the motor seat 6. The lower ends of the two pull rods are fixedly connected together with a mounting sleeve 8. The mounting sleeve 8 is sleeved on the periphery of the drill rod 7 and has a gap with the periphery of the drill rod 7, so that the mounting sleeve 8 will not interfere with the rotation of the drill rod 7. In addition, two ear blocks are symmetrically fixedly connected to the periphery of the mounting sleeve 8 along its axis. Each of the two ear blocks is rotatably connected with a swing arm 20 (as Figure 5 shown), and the two swing arms 20 are symmetrically arranged along the axis of the mounting sleeve 8. The swing arm 20 can rotate horizontally on the ear block, that is, the swing arm 20 can rotate on the horizontal plane. In addition, a reset cylinder 12 is vertically installed at the end of the swing arm 20 away from the mounting sleeve 8. The cylinder rod of the reset cylinder 12 is fixedly connected with a mounting plate 19. Two sliding rods 17 are vertically penetrated through the mounting plate 19. The sliding rods 17 can slide up and down freely on the mounting plate 19. In addition, the cross section of the sliding rod 17 is rectangular, so that the sliding rod 17 will not deflect on the mounting plate 19; A scraping plate 9 is fixedly connected to the lower end of the sliding rod 17. The width dimension of the lower end of the scraping plate 9 decreases successively from top to bottom. In addition, the scraping plates 9 on two adjacent sliding rods 17 are in contact with each other, that is, the opposite surfaces of the two scraping plates 9 are in sliding contact with each other. A spring 18 is wound around the sliding rod 17. The two ends of the spring 18 in the direction of the elastic force elastically abut against the mounting plate 19 and the scraping plate 9 respectively, and the spring 18 gives the scraping plate 9 the potential energy to move downward; The periphery of the mounting sleeve 8 is fixedly connected with a mounting arm 21. One end of the mounting arm 21 away from the mounting sleeve 8 is provided with a translation cylinder 11. The cylinder rod of the translation cylinder 11 is fixedly connected with a movable hinge seat 23. An avoidance groove 24 for the free passage of the movable hinge seat 23 is opened on the outer wall of the mounting arm 21. Each side of the movable hinge seat 23 is hinged with a hinge rod 22. The ends of the hinge rods 22 away from the movable hinge seat 23 are correspondingly hinged to the swing arm 20. When the cylinder rod of the translation cylinder 11 extends, it drives the movable hinge seat 23 to move towards the mounting sleeve 8, and then the hinge rods 22 drive the swing arm 20 to swing. When the swing arm 20 swings, the scraping plate 9 can swing around the rotation fulcrum of the swing arm 20 on the mounting sleeve 8; On the outer wall of the sliding rod 17 (as Figure 3 shown) facing the mounting sleeve 8, a sliding pin 14 is horizontally welded. The outer wall of the mounting sleeve 8 is connected with a fixed ring. A connecting plate 13 is welded on the upper end surface of the fixed ring. The connecting plate 13 and the fixed ring can be integrally formed. In addition, one end of the connecting plate 13 away from the fixed ring is welded with an arc plate 15. The center of the arc of the arc plate 15 coincides with the axis of the fixed ring, so that the fixed ring and the arc plate 15 are in a coaxial state. The axis of the arc plate 15 is coaxial with the rotation axis of the swing arm 20. The periphery of the arc plate 15 is provided with a sliding groove 16 connected end to end in sequence. The sliding pin 14 is slidably engaged in the sliding groove 16. When the swing arm 20 swings, it will cause the sliding pin 14 to slide in the sliding groove 16, so that the adjacent two sliding rods 17 move, and the two sliding rods 17 move in an up-and-down state, and then the adjacent two scraping plates 9 move up and down, so as to produce a cutting effect on the planting soil on the ground, and then crush the harder planting soil, which is convenient for subsequent backfilling work. In addition, in this embodiment, the width dimension of the sliding groove 16 is larger than the diameter of the sliding pin 14, so that the sliding pin 14 has a small range of up-and-down movement space in the sliding groove 16. The sliding groove 16 is composed of inclined holes connected end to end, so that when the sliding pin 14 slides in the sliding groove 16, the ground clearance height of the sliding pin 14 changes continuously and reciprocally.

[0031] The working principle of the present invention: The mobile vehicle moves the device to a suitable position, and then the lifting cylinder 4 is started. The cylinder rod of the lifting cylinder 4 extends, and then drives the motor base 6 to move downward, so that the pointed block at the end of the drill rod 7 can be inserted into the surface soil. Then, the motor 5 is started, and the motor shaft of the motor 5 rotates, and then drives the drill rod 7 to rotate. When the drill rod 7 rotates, it will cause the spiral drill bit 10 to exert a force on the surface soil, and then it can drill holes in the surface soil. The drilled holes are the planting pits; During the drilling process, the soil in the planting pit will be carried away along the surface of the auger bit 10 to the planting pit and dispersed around the planting pit along the surface of the auger bit 10. At this time, the soil carried out of the planting pit is distributed rather scattered, and at this time, the cylinder rod of the translation cylinder 11 is in a contracted state. The movable hinge seat 23 is located at one end of the mounting arm 21 away from the mounting sleeve 8, and the two swing arms 20 are in a state of converging towards the translation cylinder 11 (as Figure 6 shown, the two scraping plates 9 swing towards the direction close to the translation cylinder 11), at this time, the distance between the two scraping plates 9 is small, and the planting soil falling between the two scraping plates 9 is less; After the drilling is in place, first, it is necessary to make the lower end of the scraping plate 9 abut against the ground surface, that is, start the reset cylinder 12, the cylinder rod of the reset cylinder 12 extends to drive the mounting plate 19 to move downward, and the pressing force of the mounting plate 19 on the spring 18 is increased, so that the spring 18 is in a compressed state, and then the sliding pin 14 abuts against the inner wall of the sliding groove 16, so that the pressing force of the scraping plate 9 on the ground surface is increased. Then, the cylinder rod of the translation cylinder 11 extends to drive the movable hinge seat 23 to move towards the mounting sleeve 8. When the movable hinge seat 23 moves along the direction close to the mounting sleeve 8, it will cause the hinge rod 22 to drive the swing arm 20 to swing, so that the swing arm 20 rotates away from each other along the hinge joint with the ear block, and then the swing arm 20 can drive the scraping plate 9 to move away from the translation cylinder 11. When the swing arm 20 rotates, it will drive the scraping plate 9 to move synchronously; During the rotation of the swing arm 20, the sliding pin 14 will slide in the sliding groove 16, and the sliding directions of two adjacent sliding pins 14 in the sliding groove 16 are in an up-and-down state, that is, when one sliding pin 14 moves upward, the other sliding pin 14 will move downward, so that the two sliding pins 14 can drive the sliding rod 17 to move up and down, so that two adjacent scraping plates 9 can be driven to move up and down. When the two scraping plates 9 move up and down, they can cut the planting soil carried to the ground, and then cut the harder planting soil near the scraping plate 9, which is convenient for subsequent backfilling of the planting soil into the planting pit; After the swing arm 20 swings in place, as Figure 1As shown, the scraping plate 9 can gather the planting soil scattered at the edge of the planting pit opening to a relatively concentrated area, so that the planting soil can be gathered together, facilitating the subsequent backfilling of the planting soil into the planting pit. After the swing arm 20 swings into place, the reset cylinder 12 is first activated. The cylinder rod of the reset cylinder 12 shortens, and the elastic abutting force of the spring 18 on the scraping plate 9 decreases, thereby reducing the extrusion force of the scraping plate 9 on the ground. Then, the cylinder rod of the translation cylinder 11 shortens. When the cylinder rod of the translation cylinder 11 shortens, it will drive the movable hinge seat 23 to move away from the mounting sleeve 8, and then the hinge rod 22 will pull the swing arm 20 to swing, so that the two swing arms 20 swing towards the translation cylinder 11. And because the extrusion force of the scraping plate 9 on the ground is small, the phenomenon that the scraping plate 9 is severely worn will not occur; Then, the cylinder rod of the lifting cylinder 4 shortens, driving the motor base 6 to move upward, and pulling the drill rod 7 out of the planting pit. Then, the mobile carrier continues to move a fixed distance, and the drilling operation of the planting pit continues through the above steps. Thus, planting pits with approximately equal spacing can be formed on the ground, and the stacking direction of the planting soil at the edge of the planting pit opening is the same. In the subsequent backfilling operation, workers can more conveniently backfill a sufficient amount of planting soil into the planting pit to meet the planting requirements. And because the stacking direction of the planting soil is the same, workers only need to rely on simple tools to backfill the gathered planting soil into the planting pit, thereby reducing the labor intensity of workers. In addition, relying on the up-and-down reciprocating movement of the scraping plate 9 when the swing arm 20 swings, the harder planting soil can be cut, thereby achieving the purpose of reducing the volume of the planting soil.

[0032] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable tree-planting pit-digging device, characterized in that, Comprising: A connecting mechanism, on which a lifting mechanism is provided; A motor base (6) drivingly connected to the lifting mechanism, on which a drill rod (7) is vertically rotatably connected. A spiral drill bit (10) is fixedly sleeved on the periphery of the drill rod (7). A motor (5) is installed on the motor base (6), and the motor shaft of the motor (5) is drivingly connected to the drill rod (7); An installation sleeve (8) fixedly connected to the lower part of the motor base (6) by a plurality of pull rods. Two swing arms (20) are hinged to the periphery of the installation sleeve (8), and one end of the swing arm (20) far from the installation sleeve (8) is connected with a scraper (9); A driving mechanism arranged on the periphery of the installation sleeve (8), which is used to drive the two swing arms (20) to swing in the horizontal plane. The driving mechanism includes an installation arm (21) fixedly connected to the periphery of the installation sleeve (8). A translation cylinder (11) is installed at one end of the installation arm (21) far from the installation sleeve (8). The cylinder rod of the translation cylinder (11) is fixedly connected with a movable hinge seat (23). An avoidance groove (24) for the free passage of the movable hinge seat (23) is opened on the outer wall of the installation arm (21). Two hinge rods (22) are respectively hinged on both sides of the movable hinge seat (23), and one end of the hinge rod (22) far from the movable hinge seat (23) is correspondingly hinged to the swing arm (20).

2. The adjustable tree-planting pit-digging device according to claim 1, characterized in that, The connecting mechanism includes a vehicle connecting seat (1). One end of the vehicle connecting seat (1) is fixedly connected with a fixing plate (2). A plurality of columns (3) are vertically slidably penetrated through the outer wall of the fixing plate (2), and the lower ends of the columns (3) are fixedly connected to the motor base (6).

3. The adjustable tree-planting pit-digging device according to claim 2, wherein, The lifting mechanism includes a lifting cylinder (4) installed on the motor base (6), and the cylinder rod of the lifting cylinder (4) is fixedly connected with the fixing plate (2).

4. The adjustable tree-planting pit-digging device according to claim 1, wherein, The diameter of the spiral drill bit (10) decreases successively from top to bottom.

5. The adjustable tree-planting pit-digging device according to claim 1, wherein, The two swing arms (20) are symmetrically arranged along the axial direction of the installation sleeve (8).

6. The adjustable tree-planting pit-digging device according to claim 1, characterized in that, A reset cylinder (12) is vertically installed at one end of the swing arm (20) far from the installation sleeve (8). The cylinder rod of the reset cylinder (12) is fixedly connected with an installation plate (19). A floating mechanism is arranged on the installation plate (19), and the floating mechanism is connected with the scraper (9).

7. An adjustable tree-planting pit-digging device according to claim 6, characterized in that, The floating mechanism includes two sliding rods (17) vertically slidably penetrated through the installation plate (19). The lower ends of the sliding rods (17) are fixedly connected to the scraper (9). The opposite surfaces of two adjacent scrapers (9) are in sliding contact. A spring (18) is wound around the sliding rod (17). The two ends of the spring (18) in the elastic force direction are respectively elastically abutted against the installation plate (19) and the scraper (9). A reciprocating lifting unit is arranged on the periphery of the installation sleeve (8), and the reciprocating lifting unit is used to drive the two adjacent sliding rods (17) to move synchronously and in opposite directions when the swing arm (20) rotates.

8. An adjustable tree-planting pit-digging device according to claim 7, characterized in that, The cross section of the sliding rod (17) is rectangular.

9. An adjustable tree-planting pit-digging device according to claim 7, characterized in that, The reciprocating lifting unit includes a sliding pin (14) horizontally and fixedly connected to the outer wall of the sliding rod (17) facing the mounting sleeve (8). A fixing ring is connected to the outer wall of the mounting sleeve (8), and an arc-shaped plate (15) is coaxially and fixedly connected to the periphery of the fixing ring. The axis of the arc-shaped plate (15) is coaxial with the rotation axis of the swing arm (20). A sliding groove (16) that is connected end to end in sequence is formed in the periphery of the arc-shaped plate (15), and the sliding pin (14) is slidably engaged in the sliding groove (16).

Images