Pit digging device and method for grapefruit planting

Abstract

The invention discloses a pit digging device and method for grapefruit planting, and relates to the field of agricultural planting.The pit digging device comprises a vehicle body provided with walking wheels, vertical plates are symmetrically installed on the two sides of the end of the vehicle body, a lifting plate is slidably connected between the two vertical plates, and the outer portion of the lifting plate is in threaded connection with a lifting screw; the lifting screw is driven by a motor, a soil lifting cover is installed on the lifting plate, and a rotating shaft is rotationally connected to the inner side face of the soil lifting cover. According to the pit digging device and method for grapefruit planting, through mutual cooperation of a drilling blade, a spiral blade, a soil lifting cover and a telescopic cover, digging soil can be conveyed into a mixing barrel in the planting pit digging process, meanwhile, fertilizer adding is conducted through a fertilizer tank, and the fertilizer and the digging soil are mixed through a stirring plate; the soil after the planting pits are backfilled through the backfilling mechanism is sufficient in nutrient, and growth of grapefruit seedlings is facilitated.

Description

Technical Field

[0001] The invention relates to agricultural planting technology, and in particular to a pit digging device and method for grapefruit planting. Background Art

[0002] In the process of grapefruit planting, the seeds are first cultivated, and then the grapefruit saplings that have grown to a certain state are transplanted and planted. During the transplanting and planting process of the grapefruit saplings, equipment is needed to dig the planting pits.

[0003] The Chinese patent with the authorization announcement number CN221488296U discloses a grapefruit planting pit digging device, including a fixed frame and a slide, a slide is embedded in one side of the fixed frame, a slider is provided inside the slide, the slider and the slide are slidably connected, a threaded rod is provided inside the slide, the threaded rod and the slider are connected by threads, a first motor is provided on the top of the fixed frame, a mounting frame is provided on one side of the slider, the mounting frame and the slider are fixedly connected, a second motor is provided on the top of the mounting frame, the second motor and the mounting frame are fixedly connected, a drill is provided at the output end of the second motor, and during the working process, a fixed motor is provided The frame, the slide, the slider, the threaded rod, the first motor, the mounting frame, the second motor, the drill bit and the sprinkler head realize the function of automatic pit digging. There is no need for manual pit digging, which saves time and effort and effectively improves work efficiency. The sprinkler head is started to spray water on the pit digging position, which can not only moisten the soil, but also facilitate pit digging and provide a better environment for grapefruit planting. However, in the prior art and the above-mentioned patent, the grapefruit planting pit digging device can only provide the digging function of grapefruit planting pits. For soil with poor soil quality, it cannot assist in improving the soil, resulting in its relatively single function, which needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a pit digging device and method for grapefruit planting to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pit digging device for grapefruit planting, comprising a vehicle body equipped with moving wheels, vertical plates are symmetrically installed on both sides of the end of the vehicle body, a lifting plate is slidably connected between the two vertical plates, the external thread of the lifting plate is connected to a lifting screw, the lifting screw is driven by a motor, a soil lifting cover is installed on the lifting plate, the inner side surface of the soil lifting cover is rotatably connected to a rotating shaft, the bottom of the rotating shaft is annular and fixedly installed with multiple drilling blades at equal intervals, the outside of the rotating shaft is installed with a spiral blade adapted to the soil lifting cover, and a discharge port is opened at the top of the side of the soil lifting cover;

[0006] A mixing barrel is installed on the vehicle body, the inner side of the mixing barrel is rotatably connected with a connecting shaft, the connecting shaft is driven by a motor, and a plurality of stirring plates are arranged outside the connecting shaft. A fertilizer tank is installed on the top of the vehicle body, and a feed pipe is fixedly connected between the bottom end of the fertilizer tank and the top of the mixing barrel, and a control valve is installed on the feed pipe;

[0007] A telescopic cover is installed between the discharge port and the mixing barrel, and the telescopic cover can be telescopic and can discharge the crushed soil discharged from the discharge port into the mixing barrel;

[0008] A backfilling mechanism is arranged outside the mixing barrel, and the backfilling mechanism is used to backfill the crushed soil mixed with fertilizer into the planting hole.

[0009] Furthermore, a driving groove is provided on one side surface of the two vertical plates facing each other, a driving plate is fixedly connected to both sides of the lifting plate, the driving plate is threadedly connected to the lifting screw, a guide groove is provided on one side surface of the two vertical plates facing each other, a guide block corresponding to the guide groove is fixedly installed on both sides of the lifting plate, and the guide block is slidably connected to the inner side surface of the guide groove.

[0010] Furthermore, the top of the side of the telescopic cover is fixedly connected to the discharge port, the bottom end of the inner side of the telescopic cover is provided with a discharge slope, and the bottom of the inner side of the telescopic cover is provided with a connecting port located at the end of the discharge slope, and the connecting port is connected to the interior of the mixing barrel.

[0011] Furthermore, the backfilling mechanism includes a discharge port opened at the bottom of the side of the mixing barrel, the outer side surface of the connecting shaft is fixedly connected to a first discharge plate, the first discharge plate is arranged in an arc shape, a transfer box is fixedly installed at the bottom of the mixing barrel, a material guide pipe is fixedly connected between the transfer box and the discharge port, a backfilling pipe is fixedly connected to the bottom of the transfer box, a slot is opened between the backfilling pipe and the mixing barrel, the inner side surface of the slot is slidably connected to a sealing plate, the sealing plate can close the discharge port, and an electric telescopic rod is installed on the outside of the vehicle body.

[0012] Furthermore, the discharge end of the material guide pipe is tilted downward, and the discharge end of the backfill pipe is tilted downward, the telescopic end of the electric telescopic rod is fixedly connected to the sealing plate, and the specifications of the first discharge plate are compatible with the discharge port.

[0013] Furthermore, the soil lifting cover includes a drilling section, a conveying section and a crushing section from bottom to top, the diameter of the conveying section is smaller than the diameter of the drilling section and the crushing section, the specifications of the spiral blades are compatible with the drilling section, the conveying section and the crushing section, the length of the drilling blade is greater than the radius of the drilling section, and a plurality of crushing teeth are arranged on the surface of the drilling blade.

[0014] Furthermore, a plurality of second discharge plates located inside the crushing section are fixedly installed in an annular shape at equal intervals on the outside of the rotating shaft, and the second discharge plates are arranged in an arc shape, and the specifications of the second discharge plates are adapted to the discharge opening.

[0015] Furthermore, a support box is fixedly installed on the top of the inner wall of the crushing section, a crushing roller is rotatably connected between the support box and the inner wall of the crushing section, the outside of the crushing roller is coaxially fixedly connected to a first bevel gear located inside the support box, and the outside of the rotating shaft is fixedly installed with a second bevel gear located inside the support box.

[0016] Furthermore, the first bevel gear is meshed with the second bevel gear, and the crushing roller is arranged above the second discharge plate.

[0017] The present invention also provides a method for digging a hole for grapefruit planting, using the above-mentioned digging hole device for grapefruit planting, comprising the following steps:

[0018] S1, push the vehicle body to the location where the pit is to be dug;

[0019] S2, the drilling blade and the spiral blade are driven to rotate by the rotating shaft, and then the lifting screw is driven to move the lifting plate downward, so that the soil lifting cover and the drilling blade move downward to dig the pit;

[0020] S3, the crushed soil formed by excavation is transported upward to the crushing section in the soil lifting cover by the spiral blade, and the crushing roller is driven by the rotating shaft to crush the soil blocks in the crushing section, and then the crushed soil is pushed into the telescopic cover by the second discharge plate, so that the crushed soil can be transported to the mixing barrel;

[0021] S4, opening the control valve so that the fertilizer in the fertilizer tank can fall into the mixing barrel, and then driving the stirring plate to rotate through the connecting shaft to mix the crushed soil and the fertilizer;

[0022] S5. After the planting pit is excavated, the vehicle body is moved, and the grapefruit sapling is placed in the planting pit, and then the vehicle body is moved so that the end of the backfill pipe moves to the planting pit;

[0023] S6. The electric telescopic rod is started to shrink its telescopic end and drive the sealing plate to move upward to open the discharge port. At this time, the connecting shaft rotates to drive the first discharge plate to rotate, so that the first discharge plate can push the crushed soil mixed in the mixing barrel into the guide pipe, and transport it from the end of the guide pipe to the transfer box, and finally backfill it into the planting hole from the end of the backfill pipe;

[0024] S7, move the vehicle body to the next pit to be dug, and repeat steps S1 to S6.

[0025] Compared with the prior art, the present invention provides a pit digging device and method for grapefruit planting, which has the following beneficial effects:

[0026] 1. The pit digging device and method for grapefruit planting can transport the excavated soil to a mixing barrel during the digging of the planting pit through the cooperation between the drilling blade, the spiral blade, the soil lifting cover and the telescopic cover, and at the same time, fertilizer is added through a fertilizer tank, and the fertilizer and the excavated soil are mixed through a stirring plate, so that the soil after the planting pit is backfilled by the backfilling mechanism has sufficient nutrients, which is conducive to the growth of grapefruit seedlings.

[0027] 2. The pit digging device and method for grapefruit planting has a crushing section on the top of the soil lifting cover, and a crushing roller and a second discharge plate inside the cover, so that the excavated soil can be crushed and discharged after being sent into the crushing section, thereby making the excavated soil entering the mixing barrel more loose, which is beneficial to the mixing of fertilizers. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 A front view of the overall structure provided by an embodiment of the present invention;

[0030] Figure 2 A bottom view of the overall structure provided by an embodiment of the present invention;

[0031] Figure 3 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at A in the middle;

[0032] Figure 4 A schematic diagram of the internal structure of a soil lifting cover provided in an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of the internal structure of the crushing section of the soil lifting cover provided in an embodiment of the present invention;

[0034] Figure 6 A schematic diagram of the internal structure of a mixing barrel and a telescopic cover provided in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Car body; 2. Vertical plate; 21. Lifting plate; 22. Lifting screw; 23. Soil lifting cover; 24. Rotating shaft; 25. Drilling blade; 26. Spiral blade; 27. Discharge port; 28. Driving groove; 29. ​​Driving plate; 210. Guide groove; 211. Guide block; 212. Crushing teeth; 3. Mixing barrel; 31. Connecting shaft; 32. Stirring plate; 33. Fertilizer tank; 34. Discharge pipe; 35. Control valve; 4 , telescopic cover; 41, discharge slope; 42, connecting port; 5, backfill mechanism; 51, discharge port; 52, first discharge plate; 53, transfer box; 54, guide pipe; 55, backfill pipe; 56, sealing plate; 57, electric telescopic rod; 6, drilling section; 61, conveying section; 62, crushing section; 63, second discharge plate; 64, support box; 65, crushing roller; 66, first bevel gear; 67, second bevel gear. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] Embodiment 1:

[0039] See also Figure 1-Figure 6 A pit digging device for grapefruit planting, comprising a vehicle body 1 equipped with moving wheels, vertical plates 2 are symmetrically installed on both sides of the end of the vehicle body 1, a lifting plate 21 is slidably connected between the two vertical plates 2, the external thread of the lifting plate 21 is connected with a lifting screw 22, the lifting screw 22 is driven by a motor, a soil lifting cover 23 is installed on the lifting plate 21, the inner side of the soil lifting cover 23 is rotatably connected with a rotating shaft 24, the bottom of the rotating shaft 24 is annular and fixed with multiple drilling blades 25 at equal intervals, the outside of the rotating shaft 24 is installed with a spiral blade 26 adapted to the soil lifting cover 23, and a discharge port 27 is opened on the top of the side of the soil lifting cover 23;

[0040] A mixing barrel 3 is mounted on the vehicle body 1, and a connecting shaft 31 is rotatably connected to the inner side of the mixing barrel 3, and the connecting shaft 31 is driven by a motor. A plurality of stirring plates 32 are arranged outside the connecting shaft 31, and a fertilizer tank 33 is mounted on the top of the vehicle body 1, and a feed pipe 34 is fixedly connected between the bottom end of the fertilizer tank 33 and the top of the mixing barrel 3, and a control valve 35 is mounted on the feed pipe 34;

[0041] A telescopic cover 4 is installed between the discharge port 27 and the mixing barrel 3. The telescopic cover 4 can be telescopic and can discharge the crushed soil discharged from the discharge port 27 into the mixing barrel 3.

[0042] A backfilling mechanism 5 is provided outside the mixing barrel 3, and the backfilling mechanism 5 is used to backfill the crushed soil mixed with fertilizer into the planting hole.

[0043] It should be supplemented that a driving groove 28 is provided on the surface of the two facing sides of the two vertical plates 2, and a driving plate 29 is fixedly connected to both sides of the lifting plate 21. The driving plate 29 is threadedly connected to the lifting screw 22. A guide groove 210 is provided on the surface of the two facing sides of the vertical plates 2, and a guide block 211 corresponding to the guide groove 210 is fixedly installed on both sides of the lifting plate 21, and the guide block 211 is slidably connected to the inner side surface of the guide groove 210.

[0044] During the rotation of the lifting screw 22 , under the steady guiding action of the guide block 211 and the guide groove 210 , the lifting plate 21 can smoothly perform lifting and lowering movements, thereby driving the drilling blade 25 to move downward to dig the planting pit.

[0045] Furthermore, the top of the side of the telescopic cover 4 is fixedly connected to the discharge port 27, the bottom end of the inner side of the telescopic cover 4 is provided with a discharge slope 41, and the bottom of the inner side of the telescopic cover 4 is provided with a connecting port 42 located at the end of the discharge slope 41, and the connecting port 42 is connected to the interior of the mixing barrel 3, so that when the crushed soil falls into the bottom of the inner wall of the telescopic cover 4, it can slide down along the discharge slope 41 into the mixing barrel 3.

[0046] It should be supplemented that the backfilling mechanism 5 includes a discharge port 51 opened at the bottom of the side of the mixing barrel 3, and the outer side surface of the connecting shaft 31 is fixedly connected to the first discharge plate 52, and the first discharge plate 52 is arranged in an arc shape. A transfer box 53 is fixedly installed at the bottom of the mixing barrel 3, and a material guide pipe 54 is fixedly connected between the transfer box 53 and the discharge port 51. A backfilling pipe 55 is fixedly connected to the bottom of the transfer box 53, and a slot is opened between the backfilling pipe 55 and the mixing barrel 3. A sealing plate 56 is slidably connected to the inner side surface of the slot, and the sealing plate 56 can close the discharge port 51. An electric telescopic rod 57 is installed on the outside of the vehicle body 1.

[0047] It is further explained that the discharge end of the guide pipe 54 is tilted downward, and the discharge end of the backfill pipe 55 is tilted downward, the telescopic end of the electric telescopic rod 57 is fixedly connected to the sealing plate 56, and the specifications of the first discharge plate 52 are compatible with the discharge port 51.

[0048] During operation, the operator first pushes the vehicle body 1 to the position where the pit is to be dug, and then drives the rotating shaft 24 to rotate through the motor, and the rotating shaft 24 drives the drilling blade 25 and the spiral blade 26 to rotate synchronously. After that, the lifting screw 22 is driven by the motor to rotate, and the lifting screw 22 drives the lifting plate 21 to move downward, so that the soil lifting cover 23 and the drilling blade 25 move downward synchronously. After the drilling blade 25 moves to contact the soil layer, it continues to move downward to dig the planting pit;

[0049] When the drilling blade 25 moves downward to dig the planting pit, a large number of soil blocks will be generated. These soil blocks will be transported to the top of the soil lifting cover 23 by the spiral blade 26, and discharged from the discharge port 27 at the top of the soil lifting cover 23 to the telescopic cover 4. The soil blocks entering the telescopic cover 4 fall freely and slide downward along the discharge slope 41 at the bottom of the inner wall of the telescopic cover 4, and finally fall into the mixing barrel 3. During this process, the connecting shaft 31 is driven by the motor to rotate, and the rotation of the connecting shaft 31 drives the stirring plate 32 to rotate. The rotation of the stirring plate 32 can stir the crushed soil that falls in. When the crushed soil begins to enter the mixing barrel 3, the operator opens the control valve 35 to open the discharge pipe 34. At this time, the fertilizer in the fertilizer tank 33 can fall into the mixing barrel 3, so that the stirring plate 32 can mix the crushed soil and fertilizer entering therein;

[0050] After the planting pit is dug, the operator moves the vehicle body 1 so that the end of the backfill pipe 55 corresponds to the position of the planting pit, and at the same time, the grapefruit seedling to be planted is placed in the planting pit;

[0051] After the crushed soil is mixed, the operator controls the telescopic end of the electric telescopic rod 57 to retract, and drives the sealing plate 56 to move upward, so that the discharge port 51 is opened. At this time, the connecting shaft 31 rotates to drive the first discharge plate 52 to rotate continuously, so that the first discharge plate 52 can push the mixed crushed soil out from the discharge port 51. The crushed soil discharged from the discharge port 51 will pass through the guide pipe 54 and the transfer box 53 in turn and enter the backfill pipe 55, and finally be discharged from the end of the backfill pipe 55 and backfilled into the planting pit to bury the grapefruit seedlings.

[0052] Embodiment 2:

[0053] See also Figure 4-Figure 5 The soil lifting cover 23 includes a drilling section 6, a conveying section 61 and a crushing section 62 from bottom to top. The diameter of the conveying section 61 is smaller than the diameter of the drilling section 6 and the crushing section 62. The specifications of the spiral blade 26 are compatible with the drilling section 6, the conveying section 61 and the crushing section 62. The length of the drilling blade 25 is greater than the radius of the drilling section 6, and a plurality of crushing teeth 212 are arranged on the surface of the drilling blade 25.

[0054] It should be noted that the length of the drilling blade 25 is greater than the radius of the drilling section 6, so that the diameter of the planting pit dug by the drilling blade 25 is greater than the diameter of the drilling section 6, so that the resistance of the soil lifting cover 23 when the drilling blade 25 moves downward is smaller. In addition, by setting the diameter of the conveying section 61 to be smaller than the diameter of the drilling section 6 and the crushing section 62, when the amount of crushed soil to be conveyed is small, it can still be smoothly conveyed upward, and the amount of crushed soil sent from the conveying section 61 to the crushing section 62 can be smaller than its internal space. Therefore, while the crushing roller 65 crushes the soil blocks, the second discharge plate 63 can discharge part of the crushed soil at the same time, so that the discharge amount of the discharge port 27 will not be too much in a short time, so that the discharge port 27 and the connecting port 42 are not easily blocked by crushed soil.

[0055] In this embodiment, the outside of the rotating shaft 24 is equidistantly fixed with a plurality of second discharge plates 63 located inside the crushing section 62 in a circular ring shape. The second discharge plates 63 are arranged in an arc shape, and the specifications of the second discharge plates 63 are adapted to the discharge port 27, so that when the second discharge plates 63 rotate, the crushed soil in the crushing section 62 can be discharged from the discharge port 27.

[0056] Furthermore, a support box 64 is fixedly installed on the top of the inner wall of the crushing section 62, a crushing roller 65 is rotatably connected between the support box 64 and the inner wall of the crushing section 62, the outside of the crushing roller 65 is coaxially fixedly connected to a first bevel gear 66 located inside the support box 64, and the outside of the rotating shaft 24 is fixedly installed with a second bevel gear 67 located inside the support box 64.

[0057] In addition, the first bevel gear 66 is meshed with the second bevel gear 67 , and the crushing roller 65 is disposed above the second discharge plate 63 so as not to interfere with the normal operation of the second discharge plate 63 .

[0058] During the working process, under the coordinated transmission between the first bevel gear 66 and the second bevel gear 67, the rotation of the rotating shaft 24 can drive the crushing roller 65 to rotate synchronously. At the same time, under the cooperation of the rotating shaft 24 and the spiral blade 26, the soil blocks produced by excavation can be transported from bottom to top and slowly sent from the top of the conveying section 61 to the crushing section 62. When the soil blocks enter the crushing section 62, the rotating second discharge plate 63 will push away the entered soil blocks. When the soil blocks are large, they will be crushed and broken into smaller volumes of crushed soil when passing through the rotating crushing roller 65. The smaller volume of crushed soil will be discharged from the discharge port 27 under the push of the second discharge plate 63, so that the excavated soil that finally falls into the mixing barrel 3 is relatively loose and smaller in volume, so as to facilitate mixing with fertilizer.

[0059] Embodiment 3:

[0060] A method for digging a hole for planting pomelo, using the above-mentioned digging hole device for planting pomelo, comprises the following steps:

[0061] S1, pushing the vehicle body 1 to the position where the pit is to be dug;

[0062] S2, the drilling blade 25 and the spiral blade 26 are driven to rotate by the rotating shaft 24, and then the lifting screw 22 is driven to drive the lifting plate 21 to move downward, so that the soil lifting cover 23 and the drilling blade 25 move downward to dig the pit;

[0063] S3, the crushed soil formed by excavation is transported upward to the crushing section 62 in the soil lifting cover 23 by the spiral blade 26, and the crushing roller 65 is driven by the rotating shaft 24 to crush the soil blocks in the crushing section 62, and then the crushed soil is pushed into the telescopic cover 4 by the second discharge plate 63, so that the crushed soil can be transported to the mixing barrel 3;

[0064] S4, open the control valve 35, so that the fertilizer in the fertilizer tank 33 can fall into the mixing barrel 3, and then drive the stirring plate 32 to rotate through the connecting shaft 31 to mix the crushed soil and the fertilizer;

[0065] S5, after the planting hole is excavated, the vehicle body 1 is moved, and the grapefruit seedling is placed in the planting hole, and then the vehicle body 1 is moved so that the end of the backfill pipe 55 moves to the planting hole;

[0066] S6, the electric telescopic rod 57 is started to shrink its telescopic end and drive the sealing plate 56 to move upward to open the discharge port 51. At this time, the connecting shaft 31 rotates to drive the first discharge plate 52 to rotate, so that the first discharge plate 52 can push the crushed soil mixed in the mixing barrel 3 into the guide pipe 54, and transport it from the end of the guide pipe 54 to the transfer box 53, and finally backfill it into the planting hole from the end of the backfill pipe 55;

[0067] S7, move the vehicle body 1 to the next pit to be dug, and repeat steps S1 to S6.

[0068] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pit digging device for grapefruit planting, comprising a vehicle body (1) equipped with moving wheels, characterized in that: Vertical plates (2) are symmetrically installed on both sides of the end of the vehicle body (1), and a lifting plate (21) is slidably connected between the two vertical plates (2). The external thread of the lifting plate (21) is connected to a lifting screw (22), and the lifting screw (22) is driven by a motor. A soil lifting cover (23) is installed on the lifting plate (21), and the inner side surface of the soil lifting cover (23) is rotatably connected to a rotating shaft (24). The bottom of the rotating shaft (24) is annularly fixed with a plurality of drilling blades (25) equidistantly installed, and the outside of the rotating shaft (24) is installed with a spiral blade (26) adapted to the soil lifting cover (23), and a discharge port (27) is provided at the top of the side of the soil lifting cover (23); A mixing barrel (3) is mounted on the vehicle body (1); a connecting shaft (31) is rotatably connected to the inner side surface of the mixing barrel (3); the connecting shaft (31) is driven by a motor; a plurality of stirring plates (32) are arranged outside the connecting shaft (31); a fertilizer tank (33) is mounted on the top of the vehicle body (1); a feed pipe (34) is fixedly connected between the bottom end of the fertilizer tank (33) and the top of the mixing barrel (3); a control valve (35) is mounted on the feed pipe (34); A telescopic cover (4) is installed between the discharge port (27) and the mixing barrel (3); the telescopic cover (4) is telescopic and can discharge the crushed soil discharged from the discharge port (27) into the mixing barrel (3); A backfilling mechanism (5) is arranged outside the mixing barrel (3), and the backfilling mechanism (5) is used to backfill the crushed soil mixed with fertilizer into the planting hole.

2. A pit digging device for grapefruit planting according to claim 1, characterized in that: A driving groove (28) is provided on one side surface of the two vertical plates (2) facing each other, a driving plate (29) is fixedly connected to both sides of the lifting plate (21), and the driving plate (29) is threadedly connected to the lifting screw (22), a guide groove (210) is provided on one side surface of the vertical plates (2), and a guide block (211) corresponding to the guide groove (210) is fixedly installed on both sides of the lifting plate (21), and the guide block (211) is slidably connected to the inner side surface of the guide groove (210).

3. A pit digging device for grapefruit planting according to claim 1, characterized in that: The top end of the side surface of the telescopic cover (4) is fixedly connected to the discharge port (27), the bottom end of the inner side surface of the telescopic cover (4) is provided with a discharge slope (41), and the bottom of the inner side surface of the telescopic cover (4) is provided with a communication port (42) located at the end of the discharge slope (41), and the communication port (42) is connected to the interior of the mixing barrel (3).

4. A pit digging device for grapefruit planting according to claim 1, characterized in that: The backfilling mechanism (5) comprises a discharge port (51) provided at the bottom of the side of the mixing barrel (3); a first discharge plate (52) is fixedly connected to the outer side of the connecting shaft (31); the first discharge plate (52) is arranged in an arc shape; a transfer box (53) is fixedly installed at the bottom of the mixing barrel (3); a material guide pipe (54) is fixedly connected between the transfer box (53) and the discharge port (51); a backfilling pipe (55) is fixedly connected to the bottom of the transfer box (53); a slot is provided between the backfilling pipe (55) and the mixing barrel (3); a sealing plate (56) is slidably connected to the inner side of the slot; the sealing plate (56) can seal the discharge port (51); and an electric telescopic rod (57) is installed outside the vehicle body (1).

5. A pit digging device for grapefruit planting according to claim 4, characterized in that: The discharge end of the guide pipe (54) is tilted downward, and the discharge end of the backfill pipe (55) is tilted downward. The telescopic end of the electric telescopic rod (57) is fixedly connected to the sealing plate (56), and the specifications of the first discharge plate (52) are compatible with the discharge port (51).

6. The pit digging device for grapefruit planting according to claim 1, characterized in that: The soil lifting cover (23) comprises, from bottom to top, a drilling section (6), a conveying section (61) and a crushing section (62); the diameter of the conveying section (61) is smaller than the diameters of the drilling section (6) and the crushing section (62); the specifications of the spiral blade (26) are compatible with the drilling section (6), the conveying section (61) and the crushing section (62); the length of the drilling blade (25) is greater than the radius of the drilling section (6); and a plurality of crushing teeth (212) are arranged on the surface of the drilling blade (25).

7. A pit digging device for grapefruit planting according to claim 6, characterized in that: The outside of the rotating shaft (24) is equidistantly and annularly fixed with a plurality of second discharge plates (63) located inside the crushing section (62); the second discharge plates (63) are arranged in an arc shape, and the specifications of the second discharge plates (63) are adapted to the discharge opening (27).

8. The pit digging device for grapefruit planting according to claim 7, characterized in that: A support box (64) is fixedly installed on the top of the inner wall of the crushing section (62), a crushing roller (65) is rotatably connected between the support box (64) and the inner wall of the crushing section (62), the outside of the crushing roller (65) is coaxially fixedly connected to a first bevel gear (66) located inside the support box (64), and the outside of the rotating shaft (24) is fixedly installed with a second bevel gear (67) located inside the support box (64).

9. A pit digging device for grapefruit planting according to claim 8, characterized in that: The first bevel gear (66) is meshed with the second bevel gear (67), and the crushing roller (65) is arranged above the second discharge plate (63).

10. A method for digging a pit for planting pomelo, using a pit digging device for planting pomelo as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, pushing the vehicle body (1) to the position where the pit is to be dug; S2, the drilling blade (25) and the spiral blade (26) are driven to rotate by the rotating shaft (24), and then the lifting plate (21) is driven to move downward by the lifting screw (22), so that the soil lifting cover (23) and the drilling blade (25) move downward to dig the pit; S3, conveying the crushed soil formed by excavation upward to the crushing section (62) in the soil lifting cover (23) through the spiral blade (26), and driving the crushing roller (65) through the rotating shaft (24) to crush the soil blocks in the crushing section (62), and then pushing the crushed soil into the telescopic cover (4) through the second discharge plate (63), so that the crushed soil can be conveyed to the mixing barrel (3); S4, opening the control valve (35) so that the fertilizer in the fertilizer tank (33) can fall into the mixing barrel (3), and then driving the stirring plate (32) to rotate through the connecting shaft (31) to mix the crushed soil and the fertilizer; S5. After the planting hole is excavated, the vehicle body (1) is moved, and the grapefruit seedling is placed in the planting hole, and then the vehicle body (1) is moved so that the end of the backfill pipe (55) moves to the planting hole; S6, the electric telescopic rod (57) is started to shrink its telescopic end and drive the sealing plate (56) to move upward to open the discharge port (51). At this time, the connecting shaft (31) rotates to drive the first discharge plate (52) to rotate, so that the first discharge plate (52) can push the crushed soil mixed in the mixing barrel (3) into the guide pipe (54), and then transport it from the end of the guide pipe (54) to the transfer box (53), and finally backfill it into the planting hole from the end of the backfill pipe (55); S7, moving the vehicle body (1) to the next pit to be dug, and repeating steps S1 to S6.

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