A pit-digging device for afforestation

Abstract

The present invention discloses a pit-digging device for afforestation, belonging to the technical field of afforestation pit-digging. It includes a moving mechanism, on which a tunneling mechanism for digging pits and an expanding mechanism for expanding the pits are arranged; the tunneling mechanism provided by the present invention can automatically dig pits in the soil, and after the pit-digging is completed, the dug pit can be expanded by the expanding mechanism, so that the dug pit has a larger breadth, and at the same time, the soil around the pit can be compacted, and the pit-digging effect is good; the tunneling mechanism provided by the present invention combines several pit-digging blocks into an integral pit-digging end. The combined pit-digging end has a conical outer surface and is provided with spiral grooves, which can efficiently realize the pit-digging operation, and can automatically separate for pit expansion after the pit-digging is completed, with high automation degree and good continuity; the moving mechanism provided by the present invention can be retracted when the tunneling mechanism is not in use, which is convenient for the overall movement of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of tree-planting pit digging, and particularly relates to a pit-digging device for tree planting and forestation. Background Art

[0002] With the development of cities, the landscaping project has gradually emerged. The landscaping project includes aspects such as construction, paving, water treatment, greening, and planting. In terms of planting, tree planting and forestation is one of the important measures to improve the environment, improve air quality, and protect water and soil. When carrying out tree planting and forestation, pit digging is a necessary step. The purpose of pit digging is to provide sufficient space and soil conditions for the growth of trees, ensuring that the root systems of trees can grow smoothly and absorb water and nutrients. There are requirements for the depth and breadth of the pits in tree planting and forestation. At this time, manual excavation will consume a large amount of manpower. In large-scale tree planting and forestation projects, mechanized pit-digging equipment can greatly improve efficiency and reduce labor costs. The existing pit-digging machines are usually driven by engines and are equipped with rotary drills or shovels, which can dig tree pits, but usually adopt fixed drills, and the breadth of the dug pits is usually insufficient. Summary of the Invention

[0003] For the above technical problems, the technical solution adopted by the present invention is: a pit-digging device for tree planting and forestation, including a moving mechanism. The moving mechanism includes a lifting frame. A tunneling mechanism for pit digging and an expanding mechanism for expanding the pit are arranged on the moving mechanism. The tunneling mechanism includes a bidirectional threaded cylinder, and the bidirectional threaded cylinder is fixedly installed below the lifting frame. The expanding mechanism includes a lower pressing plate.

[0004] The tunneling mechanism includes an inner rotating frame. An inner convex ball is arranged inside the inner rotating frame. The outer wall of the bidirectional threaded cylinder is provided with a bidirectional external thread. The inner convex ball slides in the bidirectional external thread of the bidirectional threaded cylinder. A plurality of outwardly expanding frames are slidably installed on the inner rotating frame. A pit-digging block is fixedly installed on the outwardly expanding frame. The outer surfaces of the plurality of pit-digging blocks are combined into a conical shape, and spiral grooves are arranged on the outer surface.

[0005] Further, the moving mechanism includes a moving vehicle. A plurality of walking wheels are arranged at the bottom of the moving vehicle. The walking wheels are driven by a driving motor inside the moving vehicle. A lifting motor is fixedly installed on the moving vehicle. A motor wheel is fixedly installed on the motor shaft of the lifting motor. A gear shaft is rotatably installed on the moving vehicle. An internal gear and an external gear are fixedly installed on the gear shaft. An output belt is wound around the internal gear and the motor wheel.

[0006] Further, two connecting rods are rotatably installed on the moving vehicle. The two connecting rods are parallel to each other. A connecting rod gear is fixedly installed on the connecting rod. An external transmission belt is wound around the external gear and the two connecting rod gears. The lifting frame is rotatably installed with the two connecting rods. A cross connecting rod is rotatably installed between the two connecting rods.

[0007] The mobile vehicle moves to the location where a pit is to be dug with the device. In the initial state, the inner connecting rod fits with the mobile vehicle. At this time, the lifting frame is in the retracted state. The lifting motor rotates to drive the motor wheel to rotate, drives the gear shaft, the internal gear, and the external gear to rotate through the output belt, and drives the two connecting rod gears and the connecting rod to rotate through the external transmission belt, thereby driving the lifting frame to turn outwards. Due to the existence of the horizontal connecting rod and the two connecting rods being parallel to each other, the lifting frame is always parallel to the horizontal plane. After the lifting frame extends, the bottom of the pit-digging block contacts the ground.

[0008] Furthermore, the tunneling mechanism further includes a pit-digging motor fixedly installed on the lifting frame. A motor gear is fixedly installed on the motor shaft of the pit-digging motor. An upper gear column is rotatably installed on the lifting frame. A lower gear is fixedly installed at the lower part of the upper gear column. A lower transmission belt is wound around the lower gear and the motor gear.

[0009] Furthermore, a bidirectional lead screw is rotatably installed on the lifting frame. The outer wall of the bidirectional lead screw is provided with a bidirectional external thread. The bidirectional external thread of the bidirectional lead screw is divided into an upper quarter part and a lower three-quarter part. The pitch of the thread in the upper quarter part is greater than the pitch of the thread in the lower three-quarter part. A fixed convex ball is provided on the lifting frame and slides in the bidirectional external thread of the bidirectional lead screw. A top gear is fixedly installed at the top of the bidirectional lead screw, and a lower gear is fixedly installed at the bottom of the bidirectional lead screw. The top gear meshes with the upper gear column. The pitch of the thread in the upper quarter part of the outer wall of the bidirectional lead screw is greater than the pitch of the thread on the outer wall of the bidirectional thread barrel, and the pitch of the thread in the lower three-quarter part of the outer wall of the bidirectional lead screw is equal to the pitch of the thread on the outer wall of the bidirectional thread barrel.

[0010] Furthermore, a vertical rod is fixedly installed on the inner rotating frame. A rotating ring is slidably installed on the vertical rod. A rotating gear is fixedly installed on the rotating ring, and the rotating gear meshes with the lower gear.

[0011] Furthermore, an inner spring is provided between the inner rotating frame and the outer expanding frame. An expanding connecting rod is rotatably installed on the outer expanding frame, and the expanding connecting rod is rotatably installed with the rotating ring.

[0012] The rotation of the digging motor drives the rotation of the motor gear. Through the lower transmission belt, the lower gear and the upper gear column are driven to rotate, thereby driving the rotation of the top gear, the bidirectional lead screw, and the lower gear. The lower gear drives the rotation of the rotating gear and the rotating ring. The rotating ring can only slide downward along the vertical rod. Through the vertical rod, the inner rotating frame is driven to rotate, thereby driving the rotation of the digging block, realizing the rotation of the digging block. At the same time, when the bidirectional lead screw rotates, under the action of the fixed convex ball, the bidirectional lead screw rotates downward in a spiral manner, so that the top gear and the lower gear descend synchronously. 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 descend in a spiral manner together. When the fixed convex ball is located in the lower three-quarters part of the thread of the bidirectional lead screw, the rotating gear, the inner rotating frame, the digging block, and the bidirectional lead screw descend at the same speed. The digging block rotates the soil in a spiral manner to dig a hole. When the fixed convex ball enters the upper one-quarter part of the thread of the bidirectional lead screw, since the pitch of the upper one-quarter part of the thread of the bidirectional lead screw is greater than the outer thread pitch of the bidirectional thread barrel, at this time, the descending speed of the bidirectional lead screw is greater than the descending speeds of the rotating gear, the inner rotating frame, and the digging block. After the bidirectional lead screw rotates for a period of time, the lower gear disengages from the rotating gear. At this time, the rotating gear, the inner rotating frame, and the digging block stop moving.

[0013] Further, the hole expanding mechanism includes a lower top block and an inner sliding column fixedly installed below the lower pressing plate. The inner sliding column slides within the bidirectional thread barrel. An internal spring is provided between the inner sliding column and the bidirectional thread barrel. A lower pressing plate is fixedly installed on the rotating gear. In the initial position, the lower top block does not contact the lower pressing plate.

[0014] The descent of the top gear will drive the lower pressing plate to descend together, and the internal spring is compressed. After the rotating gear, the inner rotating frame, and the digging block stop moving, the bidirectional lead screw continues to descend a certain distance, and then the lower top block presses down the lower pressing plate. The lower pressing plate drives the rotating gear and the rotating ring to slide downward along the vertical rod. Since the bidirectional lead screw and the lower gear descend a certain distance before the lower top block contacts the lower pressing plate, at this time, the rotating gear will not mesh with the lower gear. The descent of the rotating ring drives the expansion link to rotate. The expansion link drives the outer expansion frame and the digging block to move outward. The inner spring is stretched. The holes are expanded by several digging blocks moving outward at the same time. After the hole expansion is completed, the bidirectional lead screw is located at the lowest position. Since the threads on the outer walls of the bidirectional lead screw and the bidirectional thread barrel are bidirectional threads, at this time, the bidirectional lead screw continues to rotate. Under the action of the fixed convex ball, the bidirectional lead screw starts to rise. The lower pressing plate resets under the rebound of the internal spring. The rotating ring, the rotating gear, and the lower pressing plate reset under the rebound of the inner spring.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: (1) The tunneling mechanism provided by the present invention can automatically dig pits in the soil. After the pit digging is completed, the pit expanding mechanism expands the dug pit, making the dug pit wider, and at the same time, it can compact the soil around the pit, and the pit digging effect is good; (2) The tunneling mechanism provided by the present invention combines several pit digging blocks into an integral pit digging end. The combined pit digging end has a conical outer surface and is provided with spiral grooves, which can efficiently realize the pit digging operation. At the same time, it can automatically separate for pit expansion after the pit digging is completed, with a high degree of automation and good continuity; (3) The moving mechanism provided by the present invention can be retracted when the tunneling mechanism is not in use, which is convenient for the overall movement of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the moving mechanism of the present invention.

[0018] Figure 3 It is a schematic diagram of the structure of the tunneling mechanism of the present invention Figure 1 .

[0019] Figure 4 It is a schematic diagram of the structure of the tunneling mechanism of the present invention Figure 2 .

[0020] Figure 5 It is a schematic diagram of the structure of the tunneling mechanism of the present invention Figure 3 .

[0021] Figure 6 It is a schematic diagram of the structure of the tunneling mechanism of the present invention Figure 4 .

[0022] Figure 7 It is a schematic diagram of the cooperation between the inner convex ball and the bidirectional threaded barrel of the present invention.

[0023] Figure 8 It is a schematic diagram of the cooperation between the fixed convex ball and the bidirectional lead screw of the present invention.

[0024] Figure 9 It is a schematic diagram of the one-quarter thread and three-quarter thread on the bidirectional lead screw of the present invention.

[0025] Figure 10 It is a schematic diagram of the structure of the pit expanding mechanism of the present invention Figure 1 .

[0026] Figure 11 It is a schematic diagram of the structure of the pit expanding mechanism of the present invention Figure 2 .

[0027] 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

[0028] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] Example: Reference Figures 1 - 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;

[0030] 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.

[0031] 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.

[0032] like Figure 2As shown, two connecting rods 108 are rotatably installed on the mobile vehicle 101. The two connecting rods 108 are parallel to each other. A connecting rod gear 109 is fixedly installed on the connecting rod 108. An external transmission belt 110 is wound around the external gear 107 and the two connecting rod gears 109. The lifting frame 112 is rotatably installed with the two connecting rods 108. A cross connecting rod 111 is rotatably installed between the two connecting rods 108.

[0033] The mobile vehicle 101 moves the device to the location where the pit needs 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 the retracted state. The lifting motor 102 rotates to drive the motor wheel 103 to rotate. Through the output belt 104, the gear shaft 105, the internal gear 106 and the external gear 107 are driven to rotate. Through the external transmission belt 110, the two connecting rod gears 109 and the connecting rods 108 are driven to rotate, thereby driving the lifting frame 112 to turn outwards. Due to the existence of the cross connecting rod 111 and the two connecting rods 108 being parallel to each other, the lifting frame 112 is always parallel to the horizontal plane. After the lifting frame 112 extends, the bottom of the pit digging block 217 contacts the ground.

[0034] As Figures 3 - 9 shown, the tunneling mechanism further includes a pit digging motor 201 fixedly installed on the lifting frame 112. A motor gear 202 is fixedly installed on the motor shaft of the pit digging motor 201. An upper gear column 205 is rotatably installed on the lifting frame 112. A lower gear 204 is fixedly installed at the lower part of the upper gear column 205. A lower transmission belt 203 is wound around the lower gear 204 and the motor gear 202.

[0035] As Figures 3 - 9 shown, a bidirectional lead screw 206 is rotatably installed on the lifting frame 112. The outer wall of the bidirectional lead screw 206 is provided with a bidirectional external thread. The bidirectional external thread of the bidirectional lead screw 206 is divided into an upper quarter part and a lower three - quarter part. The pitch of the thread in the upper quarter part is greater than the pitch of the thread in the lower three - quarter part. A fixed convex ball 219 is provided on the lifting frame 112. The fixed convex ball 219 slides in the bidirectional external thread of the bidirectional lead screw 206. A top gear 207 is fixedly installed at the top of the bidirectional lead screw 206. A lower gear 208 is fixedly installed at the bottom of the bidirectional lead screw 206. The top gear 207 meshes with the upper gear column 205. The pitch of the thread in the upper quarter part of the outer wall of the bidirectional lead screw 206 is greater than the pitch of the thread on the outer wall of the bidirectional thread cylinder 209. The pitch of the thread in the lower three - quarter part of the outer wall of the bidirectional lead screw 206 is equal to the pitch of the thread on the outer wall of the bidirectional thread cylinder 209.

[0036] As Figures 3 - 9 shown, a vertical rod 211 is fixedly installed on the inner rotating frame 212. A rotating ring 218 is slidably installed on the vertical rod 211. A rotating gear 210 is fixedly installed on the rotating ring 218. The rotating gear 210 meshes with the lower gear 208.

[0037] AsFigures 3 - 9 As shown, an inner spring 215 is provided between the inner rotating frame 212 and the outer expanding frame 214. An expanding connecting rod 216 is rotatably installed on the outer expanding frame 214, and the expanding connecting rod 216 is rotatably installed with the rotating ring 218.

[0038] The digging motor 201 rotates to drive the motor gear 202 to rotate, 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 bidirectional lead screw 206 and the lower gear 208 to rotate. 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. The inner rotating frame 212 is driven to rotate through the vertical rod 211, thereby driving the digging block 217 to rotate, realizing the rotation of the digging block 217. At the same time, when the bidirectional lead screw 206 rotates, under the action of the fixed convex ball 219, the bidirectional lead screw 206 rotates spirally downward, so that the top gear 207 and the lower gear 208 descend synchronously. At the same time, under the action of the inner convex ball 213, the inner rotating frame 212, the vertical rod 211, the rotating ring 218 and the rotating gear 210 descend spirally together. When the fixed convex ball 219 is located in the lower three-quarters part of the thread of the bidirectional lead screw 206, the rotating gear 210, the inner rotating frame 212, the digging block 217 and the bidirectional lead screw 206 descend at the same speed, and the digging block 217 rotates the soil in a spiral manner for digging. When the fixed convex ball 219 enters the upper one-quarter part of the thread of the bidirectional lead screw 206, since the pitch of the upper one-quarter part of the thread of the bidirectional lead screw 206 is greater than the outer thread pitch of the bidirectional thread barrel 209, at this time, the descending speed of the bidirectional lead screw 206 is greater than the descending speeds of the rotating gear 210, the inner rotating frame 212 and the digging block 217. After the bidirectional lead screw 206 rotates for a period of time, the lower gear 208 disengages from the rotating gear 210, and at this time, the rotating gear 210, the inner rotating frame 212 and the digging block 217 stop moving.

[0039] As Figure 10 、 Figure 11 As shown, the pit expanding mechanism includes a lower top block 302 and an inner sliding column 303 fixedly installed below the lower pressing plate 301. The inner sliding column 303 slides in the bidirectional thread barrel 209. An internal spring 305 is provided between the inner sliding column 303 and the bidirectional thread barrel 209. A lower pressing plate 304 is fixedly installed on the rotating gear 210. In the initial position, the lower top block 302 does not contact the lower pressing plate 304.

[0040] When the top gear 207 descends, it drives the lower pressing plate 301 to descend together, and the internal spring 305 is compressed. After the rotation of the gear 210, the inner rotating frame 212, and the pit-digging block 217 stops moving, when the two-way lead screw 206 continues to descend a certain distance, the lower top block 302 presses down the lower pressing disc 304. The lower pressing disc 304 drives the rotation gear 210 and the rotating ring 218 to slide downward along the vertical rod 211. Since the two-way lead screw 206 and the lower gear 208 descend a certain distance before the lower top block 302 contacts the lower pressing disc 304, at this time, the rotation gear 210 will not mesh with the lower gear 208. The descent of the rotating ring 218 drives the expansion connecting rod 216 to rotate, and the expansion connecting rod 216 drives the outer expansion frame 214 and the pit-digging block 217 to move outward. The inner spring 215 is stretched, and the pit is expanded by the simultaneous outward movement of several pit-digging blocks 217. After the pit expansion is completed, the two-way lead screw 206 is in the lowest position. Since the threads on the outer walls of the two-way lead screw 206 and the two-way threaded cylinder 209 are two-way threads, at this time, when the two-way lead screw 206 continues to rotate, the two-way lead screw 206 starts to rise under the action of the fixed convex ball 219. The lower pressing plate 301 resets under the rebound of the internal spring 305, and the rotating ring 218, the rotation gear 210, and the lower pressing disc 304 reset under the rebound of the inner spring 215.

[0041] The working principle of a pit-digging device for afforestation disclosed by the present invention is as follows: The mobile vehicle 101 drives the device to the location where a pit needs 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 the retracted state. The lifting motor 102 rotates to drive the motor wheel 103 to rotate. Through the output belt 104, the gear shaft 105, the internal gear 106, and the external gear 107 are driven to rotate. Through the external transmission belt 110, the two connecting rod gears 109 and the connecting rod 108 are driven to rotate, thereby driving the lifting frame 112 to turn outwards. Due to the existence of the cross connecting rod 111 and the two connecting rods 108 being parallel to each other, the lifting frame 112 is always parallel to the horizontal plane. After the lifting frame 112 extends, the bottom of the pit-digging block 217 contacts the ground. The pit-digging motor 201 rotates to drive the motor gear 202 to rotate. Through the lower transmission belt 203, the lower gear 204 and the upper gear column 205 are driven to rotate, thereby driving the top gear 207, the bidirectional lead screw 206, and the lower gear 208 to rotate. The lower gear 208 drives the rotating gear 210 and the rotating ring 218 to rotate. The rotating ring 218 can only slide down along the vertical rod 211. Through the vertical rod 211, the inner rotating frame 212 is driven to rotate, thereby driving the pit-digging block 217 to rotate, realizing the rotation of the pit-digging block 217. At the same time, when the bidirectional lead screw 206 rotates, under the action of the fixed convex ball 219, the bidirectional lead screw 206 rotates downward in a spiral manner, so that the top gear 207 and the lower gear 208 descend synchronously. At the same time, under the action of the inner convex ball 213, the inner rotating frame 212, the vertical rod 211, the rotating ring 218, and the rotating gear 210 descend in a spiral manner together. When the fixed convex ball 219 is located in the lower three-quarters part of the thread of the bidirectional lead screw 206, the rotating gear 210, the inner rotating frame 212, the pit-digging block 217, and the bidirectional lead screw 206 descend at the same speed. The pit-digging block 217 rotates the soil in a spiral manner to dig a pit. When the fixed convex ball 219 enters the upper one-quarter part of the thread of the bidirectional lead screw 206, since the pitch of the upper one-quarter part of the thread of the bidirectional lead screw 206 is greater than the outer thread pitch of the bidirectional thread barrel 209, at this time, the descending speed of the bidirectional lead screw 206 is greater than the descending speeds of the rotating gear 210, the inner rotating frame 212, and the pit-digging block 217. After the bidirectional lead screw 206 rotates for a period of time, the lower gear 208 disengages from the rotating gear 210. At this time, the rotating gear 210, the inner rotating frame 212, and the pit-digging block 217 stop moving.When the top gear 207 descends, it drives the lower pressing plate 301 to descend together, and the internal spring 305 is compressed. After the rotation of the gear 210, the inner rotating frame 212 and the digging block 217 stop moving, the two-way lead screw 206 continues to descend a certain distance, and then the lower top block 302 presses down the pressing plate 304. The pressing plate 304 drives the rotating gear 210 and the rotating ring 218 to slide downward along the vertical rod 211. Since the two-way lead screw 206 and the lower gear 208 descend a certain distance before the lower top block 302 contacts the pressing plate 304, the rotating gear 210 does not mesh with the lower gear 208 at this time. The descending rotating ring 218 drives the spreading connecting rod 216 to rotate, and the spreading connecting rod 216 drives the outer spreading frame 214 and the digging block 217 to move outward, and the inner spring 215 is stretched. The digging is expanded by the simultaneous outward movement of several digging blocks 217. After the expansion of the pit is completed, the two-way lead screw 206 is in the lowest position. Since the threads on the outer walls of the two-way lead screw 206 and the two-way threaded cylinder 209 are two-way threads, the two-way lead screw 206 continues to rotate at this time. Under the action of the fixed convex ball 219, the two-way lead screw 206 starts to rise, the lower pressing plate 301 resets under the rebound of the internal spring 305, and the rotating ring 218, the rotating gear 210 and the pressing plate 304 reset under the rebound of the inner spring 215.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope of the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within 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 cylinder (209), the inner convex ball (213) slides in the bidirectional external thread of the bidirectional threaded cylinder (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; The excavation mechanism also includes a pit digging motor (201) fixedly mounted on the lifting frame (112), a motor gear (202) fixedly mounted on the motor shaft of the pit 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); 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).

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: 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).

5. The pit digging device for tree planting according to claim 4, 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).

6. The pit digging device for tree planting according to claim 4, 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).

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