Pit digging device for afforestation

Abstract

The invention discloses a pit digging device for afforestation, and belongs to the technical field of afforestation pit digging, the pit digging device comprises a moving mechanism, and the moving mechanism is provided with a tunneling mechanism for digging a pit and a pit expanding mechanism for expanding the pit; the tunneling mechanism can automatically dig holes in soil, and after hole digging is completed, the dig holes are expanded through the hole expanding mechanism, so that the dig holes are larger in breadth, meanwhile, soil around the holes can be compacted, and the hole digging effect is good; according to the tunneling mechanism, a plurality of pit digging blocks are combined into an integral pit digging tail end, the appearance of the combined pit digging tail end is conical, a spiral groove is formed, pit digging operation can be efficiently achieved, meanwhile, automatic separation can be conducted for pit expanding after pit digging is completed, the automation degree is high, and continuity is good; the moving mechanism can be folded when the tunneling mechanism is not used, and the whole device can be moved conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of afforestation pit digging, in particular to a pit digging device for afforestation. Background Art

[0002] With the development of cities, gardening and greening projects have gradually emerged. Greening projects include construction, paving, water control, greening, planting and other aspects. In terms of planting, afforestation is one of the important measures to improve the environment, improve air quality and protect water and soil. When planting trees, digging pits is a necessary step. The purpose of digging pits is to provide sufficient space and soil conditions for the growth of trees, to ensure that the roots of trees can grow smoothly and absorb water and nutrients. There are requirements for the depth and width of the pits for afforestation. At this time, manual digging will consume a lot of manpower. In large-scale afforestation projects, mechanized digging equipment can greatly improve efficiency and reduce labor costs; the digging machine in the prior art is usually driven by an engine and equipped with a rotating drill bit or a shovel, which can dig tree pits, but usually uses a fixed drill bit, and the width of the digging pit is usually insufficient. Summary of the invention

[0003] In view of the above technical problems, the technical solution adopted by the present invention is: a pit digging device for afforestation, comprising a moving mechanism, the moving mechanism comprising a lifting frame, the moving mechanism being provided with a digging mechanism for digging a pit and a pit expanding mechanism for expanding a pit, the digging mechanism comprising a bidirectional threaded cylinder, the bidirectional threaded cylinder being fixedly mounted below the lifting frame, and the pit expanding mechanism comprising a lower pressing plate; The excavation mechanism includes an inner rotating frame, an inner convex ball is arranged in the inner rotating frame, a bidirectional external thread is arranged on the outer wall of the bidirectional threaded barrel, the inner convex ball slides in the bidirectional external thread of the bidirectional threaded barrel, a plurality of external tensioning frames are slidably installed on the inner rotating frame, a digging block is fixedly installed on the external tensioning frame, the outer surfaces of the plurality of digging blocks are combined into a cone shape, and spiral grooves are arranged on the outer surfaces.

[0004] Furthermore, the mobile mechanism includes a mobile vehicle, a plurality of sets of running wheels are arranged at the bottom of the mobile vehicle, the running wheels are driven by a driving motor in the mobile vehicle, a lifting motor is fixedly installed on the mobile vehicle, a motor wheel is fixedly installed on the motor shaft of the lifting motor, a gear shaft is rotatably installed on the mobile vehicle, an internal gear and an external gear are fixedly installed on the gear shaft, and an output belt is wrapped around the internal gear and the motor wheel.

[0005] Furthermore, two connecting rods are rotatably installed on the mobile vehicle, the two connecting rods are parallel to each other, connecting rod gears are fixedly installed on the connecting rods, an external transmission belt is wrapped around the external gear and the two connecting rod gears, the lifting frame is rotatably installed with the two connecting rods, and a horizontal connecting rod is rotatably installed between the two connecting rods.

[0006] The mobile vehicle moves with the device to the location where the pit is to be dug. In the initial state, the inner connecting rod is in contact with the mobile vehicle. At this time, the lifting frame is in an inward state. The rotation of the lifting motor drives the motor wheel to rotate, and the output belt drives the gear shaft, the inner gear and the outer gear to rotate. The outer transmission belt drives the two connecting rod gears and the connecting rod to rotate, thereby driving the lifting frame to flip outward. Due to the existence of the horizontal connecting rod and the two connecting rods are parallel to each other, the lifting frame is always parallel to the horizontal plane. After the lifting frame is extended, the bottom of the digging block contacts the ground.

[0007] Furthermore, the excavation mechanism also includes a digging motor fixedly mounted on the lifting frame, a motor gear is fixedly mounted on the motor shaft of the digging motor, an upper gear column is rotatably mounted on the lifting frame, a lower gear is fixedly mounted on the lower part of the upper gear column, and a lower transmission belt is wrapped around the lower gear and the motor gear.

[0008] Furthermore, a bidirectional screw rod is rotatably installed on the lifting frame, and a bidirectional external thread is arranged on the outer wall of the bidirectional screw rod. The bidirectional external thread of the bidirectional screw rod is divided into an upper quarter part and a lower three quarters part, and the pitch of the thread of the upper quarter part is greater than the pitch of the thread of the lower three quarters part. A fixed convex ball is arranged on the lifting frame, and the fixed convex ball slides in the bidirectional external thread of the bidirectional screw rod. A top gear is fixedly installed on the top of the bidirectional screw rod, and a lower gear is fixedly installed on the bottom of the bidirectional screw rod, and the top gear is meshed with the upper gear column. The pitch of the thread of the upper quarter part of the outer wall of the bidirectional screw rod is greater than the pitch of the thread of the outer wall of the bidirectional thread barrel, and the pitch of the thread of the lower three quarters part of the outer wall of the bidirectional screw rod is equal to the pitch of the thread of the outer wall of the bidirectional thread barrel.

[0009] Furthermore, a vertical pole is fixedly mounted on the inner rotating frame, a rotating ring is slidably mounted on the vertical pole, a rotating gear is fixedly mounted on the rotating ring, and the rotating gear is meshed with the lower gear.

[0010] Furthermore, an inner spring is arranged between the inner rotating frame and the outer tensioning frame, and a spreading connecting rod is rotatably mounted on the outer tensioning frame, and the spreading connecting rod is rotatably mounted on the rotating ring.

[0011] The rotation of the digging motor drives the motor gear to rotate, which drives the lower gear and the upper gear column to rotate through the lower transmission belt, thereby driving the top gear, the two-way screw rod and the lower gear to rotate, and the lower gear drives the rotating gear and the rotating ring to rotate. The rotating ring can only slide downward along the vertical rod, and drives the inner rotating frame to rotate through the vertical rod, thereby driving the digging block to rotate, realizing the rotation of the digging block, and at the same time, the rotation of the two-way screw rod, under the action of the fixed convex ball, makes the two-way screw rod spirally rotate downward, so that the top gear and the lower gear descend synchronously, and at the same time, under the action of the inner convex ball, the inner rotating frame, the vertical rod, the rotating ring and the rotating gear spirally descend together. When the fixed convex ball is located in the lower three quarters of the thread of the two-way screw, the rotating gear, the inner rotating frame, the digging block and the two-way screw descend at the same speed, and the soil is spirally rotated to dig a hole through the digging block. When the fixed convex ball enters the upper quarter of the thread of the two-way screw, since the pitch of the upper quarter of the thread of the two-way screw is greater than the pitch of the external thread of the two-way thread barrel, the descending speed of the two-way screw at this time is greater than the descending speed of the rotating gear, the inner rotating frame and the digging block. After the two-way screw rotates for a period of time, the lower gear disengages from the rotating gear, and the rotating gear, the inner rotating frame and the digging block stop moving.

[0012] Furthermore, the pit expansion mechanism includes a lower top block and an inner sliding column fixedly installed under the lower pressure plate, the inner sliding column slides in the bidirectional threaded cylinder, an internal spring is arranged between the inner sliding column and the bidirectional threaded cylinder, and a lower pressure plate is fixedly installed on the rotating gear. In the initial position, the lower top block does not contact the lower pressure plate.

[0013] When the upper and lower gears are lowered, the upper and lower gears are in engagement with each other, and the lower gears are engaged with each other, and the lower gears are engaged with each other, and the lower gears are engaged with each other, and the lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other, and the upper and lower gears are engaged with each other,

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) the excavation mechanism provided in the present invention can realize automatic soil excavation, and after the excavation is completed, the excavated pit is expanded by the pit expansion mechanism, so that the excavated pit is wider and the soil around the pit can be compacted, and the excavation effect is good; (2) the excavation mechanism provided in the present invention is composed of a plurality of excavation blocks to form an integral excavation end, and the assembled excavation end has a conical appearance and is provided with a spiral groove, which can efficiently realize the excavation operation, and can automatically separate and expand the pit after the excavation is completed, with a high degree of automation and good continuity; (3) the moving mechanism provided in the present invention can be folded up when the excavation mechanism is not in use, so as to facilitate the movement of the device as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the structure of the mobile mechanism of the present invention.

[0017] Figure 3 Schematic diagram of the tunneling mechanism structure of the present invention Figure 1 .

[0018] Figure 4 Schematic diagram of the tunneling mechanism structure of the present invention Figure 2 .

[0019] Figure 5 Schematic diagram of the tunneling mechanism structure of the present invention Figure 3 .

[0020] Figure 6 Schematic diagram of the tunneling mechanism structure of the present invention Figure 4 .

[0021] Figure 7 It is a schematic diagram of the cooperation between the inner convex ball and the bidirectional threaded barrel of the present invention.

[0022] Figure 8 It is a schematic diagram of the cooperation between the fixed convex ball and the bidirectional screw rod of the present invention.

[0023] Fig. 9 It is a schematic diagram of the upper quarter thread and the lower three quarter thread of the bidirectional screw rod of the present invention.

[0024] Fig.10 Schematic diagram of the pit expansion mechanism structure of the present invention Figure 1 .

[0025] Fig.11 Schematic diagram of the pit expansion mechanism structure of the present invention Figure 2 .

[0026] Figure numbers: 101-mobile car; 102-lifting motor; 103-motor wheel; 104-output belt; 105-gear shaft; 106-internal gear; 107-external gear; 108-connecting rod; 109-connecting rod gear; 110-external transmission belt; 111-transverse connecting rod; 112-lifting frame; 201-pit digging motor; 202-motor gear; 203-lower transmission belt; 204-lower gear; 205-upper gear column; 206-bidirectional wire Rod; 207-top gear; 208-lower gear; 209-bidirectional threaded cylinder; 210-rotating gear; 211-vertical rod; 212-inner rotating frame; 213-inner convex ball; 214-external tension frame; 215-inner spring; 216-opening connecting rod; 217-digging block; 218-rotating ring; 219-fixed convex ball; 301-lower pressure plate; 302-lower top block; 303-inner sliding column; 304-lower pressure plate; 305-internal spring. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] Example: Reference Figure 1-Figure 11 A pit digging device for afforestation includes a moving mechanism, the moving mechanism includes a lifting frame 112, a digging mechanism for digging a pit and a pit expanding mechanism for expanding a pit are arranged on the moving mechanism, the digging mechanism includes a bidirectional threaded cylinder 209, the bidirectional threaded cylinder 209 is fixedly installed below the lifting frame 112, and the pit expanding mechanism includes a lower pressing plate 301; The excavation mechanism includes an inner rotating frame 212, an inner convex ball 213 is arranged inside the inner rotating frame 212, and a bidirectional external thread is arranged on the outer wall of the bidirectional threaded barrel 209. The inner convex ball 213 slides in the bidirectional external thread of the bidirectional threaded barrel 209. A plurality of external tension frames 214 are slidably installed on the inner rotating frame 212, and digging blocks 217 are fixedly installed on the external tension frames 214. The outer surfaces of the plurality of digging blocks 217 are combined into a cone, and spiral grooves are arranged on the outer surfaces.

[0029] like Figure 2 As shown, the moving mechanism includes a moving vehicle 101, and a plurality of groups of running wheels are arranged at the bottom of the moving vehicle 101. The running wheels are driven by a driving motor in the moving vehicle 101. A lifting motor 102 is fixedly installed on the moving vehicle 101, and a motor wheel 103 is fixedly installed on the motor shaft of the lifting motor 102. A gear shaft 105 is rotatably installed on the moving vehicle 101, and an internal gear 106 and an external gear 107 are fixedly installed on the gear shaft 105. An output belt 104 is wound around the internal gear 106 and the motor wheel 103.

[0030] like Figure 2As shown, two connecting rods 108 are rotatably installed on the mobile vehicle 101, and the two connecting rods 108 are parallel to each other. A connecting rod gear 109 is fixedly installed on the connecting rod 108, and an external transmission belt 110 is wrapped around the external gear 107 and the two connecting rod gears 109. A lifting frame 112 is rotatably installed with the two connecting rods 108, and a horizontal connecting rod 111 is rotatably installed between the two connecting rods 108.

[0031] The mobile vehicle 101 moves with the device to the location where the pit is to be dug. In the initial state, the inner connecting rod 108 is in contact with the mobile vehicle 101. At this time, the lifting frame 112 is in an inward state. The lifting motor 102 rotates to drive the motor wheel 103 to rotate, and the output belt 104 drives the gear shaft 105, the inner gear 106 and the outer gear 107 to rotate. The two connecting rod gears 109 and the connecting rod 108 are driven to rotate through the external transmission belt 110, thereby driving the lifting frame 112 to turn outward. Due to the existence of the horizontal connecting rod 111 and the two connecting rods 108 are parallel to each other, the lifting frame 112 is always parallel to the horizontal plane. After the lifting frame 112 is extended, the bottom of the digging block 217 contacts the ground.

[0032] like Figure 3-Figure 9 As shown, the excavation mechanism also includes a digging motor 201 fixedly mounted on the lifting frame 112, a motor gear 202 is fixedly mounted on the motor shaft of the digging motor 201, an upper gear column 205 is rotatably mounted on the lifting frame 112, a lower gear 204 is fixedly mounted on the lower part of the upper gear column 205, and a lower transmission belt 203 is wrapped around the lower gear 204 and the motor gear 202.

[0033] like Figure 3-Figure 9 As shown, a bidirectional screw rod 206 is rotatably installed on the lifting frame 112, and a bidirectional external thread is arranged on the outer wall of the bidirectional screw rod 206. The bidirectional external thread of the bidirectional screw rod 206 is divided into an upper quarter part and a lower three quarters part. The pitch of the thread of the upper quarter part is greater than the pitch of the thread of the lower three quarters part. A fixed convex ball 219 is arranged on the lifting frame 112, and the fixed convex ball 219 slides in the bidirectional external thread of the bidirectional screw rod 206. A top gear 207 is fixedly installed on the top of the bidirectional screw rod 206, and a lower gear 208 is fixedly installed on the bottom of the bidirectional screw rod 206. The top gear 207 is meshed with the upper gear column 205. The pitch of the thread of the upper quarter part of the outer wall of the bidirectional screw rod 206 is greater than the pitch of the thread of the outer wall of the bidirectional thread barrel 209, and the pitch of the thread of the lower three quarters part of the outer wall of the bidirectional screw rod 206 is equal to the pitch of the thread of the outer wall of the bidirectional thread barrel 209.

[0034] like Figure 3-Figure 9 As shown, a vertical rod 211 is fixedly mounted on the inner rotating frame 212 , a rotating ring 218 is slidably mounted on the vertical rod 211 , a rotating gear 210 is fixedly mounted on the rotating ring 218 , and the rotating gear 210 is meshed with the lower gear 208 .

[0035] like Figure 3-Figure 9 As shown, an inner spring 215 is provided between the inner rotating frame 212 and the outer tensioning frame 214 , and a spreading connecting rod 216 is rotatably mounted on the outer tensioning frame 214 , and the spreading connecting rod 216 is rotatably mounted on the rotating ring 218 .

[0036] The rotation of the digging motor 201 drives the motor gear 202 to rotate, and drives the lower gear 204 and the upper gear column 205 to rotate through the lower transmission belt 203, thereby driving the top gear 207, the two-way screw rod 206 and the lower gear 208 to rotate, and the lower gear 208 drives the rotating gear 210 and the rotating ring 218 to rotate. The rotating ring 218 can only slide downward along the vertical rod 211, and drives the inner rotating frame 212 to rotate through the vertical rod 211, thereby driving the digging block 217 to rotate, realizing the rotation of the digging block 217, and at the same time, the two-way screw rod 206 rotates under the action of the fixed convex ball 219, so that the two-way screw rod 206 spirally rotates downward, thereby causing the top gear 207 and the lower gear 208 to descend synchronously, and at the same time, the inner rotating frame 212, the vertical rod 211, the rotating ring 218 and the rotating gear 210 are driven by the inner convex ball 213. The wheel 210 spirally descends together. When the fixed convex ball 219 is located in the lower three-quarters of the thread of the two-way screw rod 206, the rotating gear 210, the inner rotating frame 212, the digging block 217 and the two-way screw rod 206 descend at the same speed, and the soil is spirally rotated and dug through the digging block 217. When the fixed convex ball 219 enters the upper quarter of the thread of the two-way screw rod 206, since the pitch of the upper quarter of the thread of the two-way screw rod 206 is greater than the pitch of the external thread of the two-way threaded cylinder 209, the descending speed of the two-way screw rod 206 is greater than the descending speed of the rotating gear 210, the inner rotating frame 212 and the digging block 217. After the two-way screw rod 206 rotates for a period of time, the lower gear 208 disengages from the rotating gear 210, and the rotating gear 210, the inner rotating frame 212 and the digging block 217 stop moving.

[0037] like Fig.10 , Fig.11 As shown, the pit expansion mechanism includes a lower top block 302 and an inner sliding column 303 fixedly installed below the lower pressure plate 301. The inner sliding column 303 slides in the bidirectional threaded cylinder 209. An internal spring 305 is arranged between the inner sliding column 303 and the bidirectional threaded cylinder 209. A lower pressure plate 304 is fixedly installed on the rotating gear 210. In the initial position, the lower top block 302 does not contact the lower pressure plate 304.

[0038] The descent of the top gear 207 will drive the lower pressure plate 301 to descend together, and the internal spring 305 will be compressed. When the rotating gear 210, the inner rotating frame 212 and the digging block 217 stop moving, the two-way screw rod 206 continues to descend for a distance, and the lower top block 302 presses the lower pressure plate 304 downward, and the lower pressure plate 304 drives the rotating gear 210 and the rotating ring 218 to slide downward along the vertical rod 211. Since the lower top block 302 contacts the lower pressure plate 304 only after the two-way screw rod 206 and the lower gear 208 have descended for a distance, the rotating gear 210 will not mesh with the lower gear 208 at this time, and the rotating ring 218 descends to drive the connecting rod to open. 216 rotates, the connecting rod 216 is stretched to drive the external tension frame 214 and the digging block 217 to move outward, the inner spring 215 is stretched, and the digging blocks 217 move outward at the same time to expand the pit. After the pit expansion is completed, the bidirectional screw rod 206 is located at the lowermost position. Since the threads on the outer walls of the bidirectional screw rod 206 and the bidirectional threaded tube 209 are bidirectional threads, the bidirectional screw rod 206 continues to rotate at this time, and the bidirectional screw rod 206 begins to rise under the action of the fixed convex ball 219. The lower pressure plate 301 is reset under the rebound of the internal spring 305, and the rotating ring 218, the rotating gear 210 and the lower pressure plate 304 are reset under the rebound of the inner spring 215.

[0039] The working principle of the pit digging device for afforestation disclosed in the present invention is as follows: a mobile vehicle 101 moves with the device to the location where a pit is to be dug, and in the initial state, the inner connecting rod 108 is in contact with the mobile vehicle 101, and the lifting frame 112 is in an inward state, and the lifting motor 102 rotates to drive the motor wheel 103 to rotate, and drives the gear shaft 105, the inner gear 106 and the outer gear 107 to rotate through the output belt 104, and drives the two connecting rod gears 109 and the connecting rod 108 to rotate through the external transmission belt 110, thereby driving the lifting frame 112 to flip outward, and due to the existence of the horizontal connecting rod 111 and the two connecting rods 108 are parallel to each other, the lifting frame 112 is always parallel to the horizontal plane, and after the lifting frame 112 is extended, the bottom of the pit digging block 217 contacts the ground. The rotation of the digging motor 201 drives the motor gear 202 to rotate, and drives the lower gear 204 and the upper gear column 205 to rotate through the lower transmission belt 203, thereby driving the top gear 207, the two-way screw rod 206 and the lower gear 208 to rotate, and the lower gear 208 drives the rotating gear 210 and the rotating ring 218 to rotate. The rotating ring 218 can only slide downward along the vertical rod 211, and drives the inner rotating frame 212 to rotate through the vertical rod 211, thereby driving the digging block 217 to rotate, realizing the rotation of the digging block 217, and at the same time, the two-way screw rod 206 rotates under the action of the fixed convex ball 219, so that the two-way screw rod 206 spirally rotates downward, thereby causing the top gear 207 and the lower gear 208 to descend synchronously, and at the same time, the inner rotating frame 212, the vertical rod 211, the rotating ring 218 and the rotating gear 210 are driven by the inner convex ball 213. The wheel 210 spirally descends together. When the fixed convex ball 219 is located in the lower three-quarters of the thread of the two-way screw rod 206, the rotating gear 210, the inner rotating frame 212, the digging block 217 and the two-way screw rod 206 descend at the same speed, and the soil is spirally rotated and dug through the digging block 217. When the fixed convex ball 219 enters the upper quarter of the thread of the two-way screw rod 206, since the pitch of the upper quarter of the thread of the two-way screw rod 206 is greater than the pitch of the external thread of the two-way threaded cylinder 209, the descending speed of the two-way screw rod 206 is greater than the descending speed of the rotating gear 210, the inner rotating frame 212 and the digging block 217. After the two-way screw rod 206 rotates for a period of time, the lower gear 208 disengages from the rotating gear 210, and the rotating gear 210, the inner rotating frame 212 and the digging block 217 stop moving.The descent of the top gear 207 will drive the lower pressure plate 301 to descend together, and the internal spring 305 will be compressed. When the rotating gear 210, the inner rotating frame 212 and the digging block 217 stop moving, the two-way screw rod 206 continues to descend for a distance, and the lower top block 302 presses the lower pressure plate 304 downward, and the lower pressure plate 304 drives the rotating gear 210 and the rotating ring 218 to slide downward along the vertical rod 211. Since the lower top block 302 contacts the lower pressure plate 304 only after the two-way screw rod 206 and the lower gear 208 have descended for a distance, the rotating gear 210 will not mesh with the lower gear 208 at this time, and the rotating ring 218 descends to drive the connecting rod to open. 216 rotates, the connecting rod 216 is stretched to drive the external tension frame 214 and the digging block 217 to move outward, the inner spring 215 is stretched, and the digging blocks 217 move outward at the same time to expand the pit. After the pit expansion is completed, the bidirectional screw rod 206 is located at the lowermost position. Since the threads on the outer walls of the bidirectional screw rod 206 and the bidirectional threaded tube 209 are bidirectional threads, the bidirectional screw rod 206 continues to rotate at this time, and the bidirectional screw rod 206 begins to rise under the action of the fixed convex ball 219. The lower pressure plate 301 is reset under the rebound of the internal spring 305, and the rotating ring 218, the rotating gear 210 and the lower pressure plate 304 are reset under the rebound of the inner spring 215.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pit digging device for tree planting, comprising a moving mechanism, characterized in that: The moving mechanism comprises a lifting frame (112), and a tunneling mechanism for digging a pit and a pit expanding mechanism for expanding the pit are arranged on the moving mechanism. The tunneling mechanism comprises a bidirectional threaded barrel (209), and the bidirectional threaded barrel (209) is fixedly installed below the lifting frame (112). The pit expanding mechanism comprises a lower pressing plate (301); The excavation mechanism comprises an inner rotating frame (212), an inner convex ball (213) is arranged inside the inner rotating frame (212), a bidirectional external thread is arranged on the outer wall of the bidirectional threaded barrel (209), the inner convex ball (213) slides in the bidirectional external thread of the bidirectional threaded barrel (209), a plurality of external tensioning frames (214) are slidably mounted on the inner rotating frame (212), a digging block (217) is fixedly mounted on the external tensioning frame (214), the outer surfaces of the plurality of digging blocks (217) are combined into a cone shape, and a spiral groove is arranged on the outer surface.

2. The pit digging device for tree planting according to claim 1, characterized in that: The mobile mechanism comprises a mobile vehicle (101), wherein a plurality of groups of running wheels are arranged at the bottom of the mobile vehicle (101), and the running wheels are driven by a driving motor in the mobile vehicle (101); a lifting motor (102) is fixedly mounted on the mobile vehicle (101), and a motor wheel (103) is fixedly mounted on the motor shaft of the lifting motor (102); a gear shaft (105) is rotatably mounted on the mobile vehicle (101), and an internal gear (106) and an external gear (107) are fixedly mounted on the gear shaft (105); and an output belt (104) is wound around the internal gear (106) and the motor wheel (103).

3. The pit digging device for afforestation according to claim 2, characterized in that: The mobile vehicle (101) is rotatably mounted with two connecting rods (108), the two connecting rods (108) are parallel to each other, a connecting rod gear (109) is fixedly mounted on the connecting rod (108), an external transmission belt (110) is wound around the external gear (107) and the two connecting rod gears (109), a lifting frame (112) is rotatably mounted with the two connecting rods (108), and a transverse connecting rod (111) is rotatably mounted between the two connecting rods (108).

4. The pit digging device for tree planting and afforestation according to claim 1, characterized in that: The excavation mechanism also includes a digging motor (201) fixedly mounted on the lifting frame (112), a motor gear (202) fixedly mounted on the motor shaft of the digging motor (201), an upper gear column (205) rotatably mounted on the lifting frame (112), a lower gear (204) fixedly mounted on the lower part of the upper gear column (205), and a lower transmission belt (203) wound around the lower gear (204) and the motor gear (202).

5. The pit digging device for tree planting according to claim 4, characterized in that: A bidirectional screw rod (206) is rotatably mounted on the lifting frame (112), and a bidirectional external thread is arranged on the outer wall of the bidirectional screw rod (206). The bidirectional external thread of the bidirectional screw rod (206) is divided into an upper quarter portion and a lower three quarter portion, and the pitch of the thread of the upper quarter portion is greater than the pitch of the thread of the lower three quarter portion. A fixed convex ball (219) is arranged on the lifting frame (112), and the fixed convex ball (219) slides in the bidirectional external thread of the bidirectional screw rod (206). A top gear (207) is fixedly mounted on the top of the bidirectional screw rod (206), a lower gear (208) is fixedly mounted on the bottom of the bidirectional screw rod (206), the top gear (207) is meshed with the upper gear column (205), the pitch of the thread of the upper quarter portion of the outer wall of the bidirectional screw rod (206) is greater than the pitch of the thread of the outer wall of the bidirectional thread barrel (209), and the pitch of the thread of the lower three quarter portion of the outer wall of the bidirectional screw rod (206) is equal to the pitch of the thread of the outer wall of the bidirectional thread barrel (209).

6. The pit digging device for tree planting according to claim 5, characterized in that: A vertical rod (211) is fixedly mounted on the inner rotating frame (212), a rotating ring (218) is slidably mounted on the vertical rod (211), a rotating gear (210) is fixedly mounted on the rotating ring (218), and the rotating gear (210) is meshed with the lower gear (208).

7. The pit digging device for tree planting according to claim 6, characterized in that: An inner spring (215) is provided between the inner rotating frame (212) and the outer tensioning frame (214); an expansion connecting rod (216) is rotatably mounted on the outer tensioning frame (214); and the expansion connecting rod (216) is rotatably mounted on a rotating ring (218).

8. The pit digging device for tree planting according to claim 6, characterized in that: The pit expansion mechanism comprises a lower top block (302) and an inner sliding column (303) fixedly mounted below the lower pressure plate (301); the inner sliding column (303) slides in the bidirectional threaded cylinder (209); an internal spring (305) is provided between the inner sliding column (303) and the bidirectional threaded cylinder (209); and a lower pressure plate (304) is fixedly mounted on the rotating gear (210).

Images