CN112956308B

CN112956308B - Difficult site forestation pit digging working head and working method thereof

Info

Publication number: CN112956308B
Application number: CN202110417909.7A
Authority: CN
Inventors: 张伟; 王国富; 苗虎; 纪敏; 金征
Original assignee: Research Institute of Wood Industry of Chinese Academy of Forestry
Current assignee: Research Institute of Wood Industry of Chinese Academy of Forestry
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2023-08-25
Anticipated expiration: 2041-04-19
Also published as: CN112956308A

Abstract

The invention discloses a difficult site forestation pit digging working head and a working method thereof, wherein the working head structure comprises a frame capable of controlling feeding movement, one side above the frame is connected with a supporting plate through a connecting frame, a hydraulic motor is arranged on the supporting plate, the bottom of the hydraulic motor is connected with a drill rod through a gearbox, and the bottom of the drill rod is used for installing a drill point or a soil cutting blade; the side wall of the drill rod is annularly provided with a spiral wing piece, the lower part of one side of the frame, which is far away from the supporting plate, is arranged on a chassis hanging plate, the chassis hanging plate is used for being connected with a power chassis, and the frame is also provided with a soil cleaning device for cleaning soil on the spiral wing piece after pit digging is finished. The invention can realize the convenient adjustment of the angle and the diameter of the spiral wing of the drill bit and the length of the drill rod of the working head, and the quick replacement of the drill bit blade and the drill tip.

Description

Difficult site forestation pit digging working head and working method thereof

Technical Field

The invention relates to the field of forestry and grasslands, in particular to a difficult site forestation pit digging working head and a working method thereof.

Background

The state highly pays attention to ecological civilization construction, and promotes large-scale homeland greening and ecological restoration actions. At present, under flat areas and advantageous working conditions, most pit digging operations can be completed by applying engineering diggers, suspension type pit diggers and handheld pit diggers. However, under difficult ground conditions such as drought and semiarid, stony desertification, salinization, abrupt slope and the like, the soil characteristic, the climate characteristics, the vegetation type and other factors influence, and especially for the operation conditions of slopes with the angle of more than 25 degrees, engineering excavators and suspension type pit diggers are difficult to climb the mountain, hand-held pit diggers depend on manpower too, the man-machine distance is relatively short, potential safety hazards exist in the operation process, and only manual operation is mainly used, so that the labor intensity is high, the labor force is insufficient, and the working efficiency is low.

Therefore, aiming at the forestation technical requirements in hilly and mountain areas and difficult site conditions, development of a forestation pit digging method and a working head structure with strong adaptability, flexible adjustment and simple structure is urgently needed, and a forestation process system under the difficult site conditions is constructed, so that the efficiency and quality of forestation are improved.

Disclosure of Invention

The invention aims to provide a working head for pit digging in difficult site afforestation and a working method thereof, which are used for solving the problems in the prior art, improving the working safety in hilly and mountain areas and difficult site conditions, improving the working efficiency and reducing the labor intensity.

In order to achieve the above object, the present invention provides the following solutions:

the invention provides a difficult site forestation pit digging working head which comprises a stand with adjustable height, wherein one side above the stand is connected with a supporting plate through a connecting frame, a hydraulic motor is arranged on the supporting plate, the bottom of the hydraulic motor is connected with a drill rod through a gearbox, and the bottom of the drill rod is used for installing a drill point or a soil cutting blade; the side wall of the drill rod is provided with a spiral wing piece in a surrounding mode, a chassis hanging plate is fixedly arranged at the lower portion of one side, away from the supporting plate, of the rack, and the chassis hanging plate is used for being connected with a power chassis.

Optionally, the frame comprises two symmetrical telescopic outer pipes, the top of each telescopic outer pipe is movably inserted with a telescopic inner rod, the bottoms of the two telescopic outer pipes are fixedly connected through a bottom connecting rod, the tops of the two telescopic inner rods are fixedly connected through a top connecting rod, and a hydraulic cylinder is connected between the bottom connecting rod and the top connecting rod; the supporting plate and the connecting frame are arranged on the top connecting rod.

Optionally, the bottom end of the top connecting rod is connected with two connecting frames which are obliquely arranged, two vertical connecting rods are arranged on the inner side of each connecting frame, the bottoms of the two vertical connecting rods are connected with one end of a triangular bracket, the bottoms of the two connecting frames are connected with the other end of the triangular bracket, and the supporting plate is fixedly connected with one end, close to the connecting frame, of the triangular bracket; the supporting plate is of a bucket type structure and comprises a bottom plate and reinforcing rib plates; the bottom plate is fixedly connected with the triangular bracket through a vertically arranged connecting plate; the reinforcing rib plates are symmetrically arranged on two sides of the bottom plate; the bottom plate is provided with a connecting through hole, screw holes are uniformly distributed on the outer side of the connecting through hole, and the bottom of the hydraulic motor is in transmission connection with the gearbox through the connecting through hole.

Optionally, the drilling rod includes first drilling rod and second drilling rod, the square hole has been seted up at first drilling rod top, first drilling rod top pass through the square hole with gearbox bottom transmission is connected, first drilling rod bottom with second drilling rod transmission is connected, second drilling rod bottom is used for installing drill point or soil cutting blade.

Optionally, the helical fin includes an upper helical fin and a lower helical fin; the upper spiral wing piece is fixedly arranged on the first drill rod, and the lower spiral wing piece is fixedly arranged on the second drill rod; the second drill rod comprises a small-diameter drill rod and a large-diameter drill rod, the small-diameter drill rod is provided with a small-diameter lower spiral wing piece, and the large-diameter drill rod is provided with a large-diameter spiral wing piece.

Optionally, the gearbox is the gear box, install the shift handle on the gearbox, through shift handle control the gearbox, can be with hydraulic motor's rotation power divide into high-grade, middle grade or low-grade and give the drilling rod for adapt to the soil of different solidity.

Optionally, the chassis hanging plate comprises a front wall, an inclined oil cylinder and a transverse oil cylinder; the front wall is uniformly provided with double-row threaded holes for being in threaded connection with the frame, the top of the front wall is provided with a plurality of clamping grooves for transverse positioning, one side of the front wall, which is far away from the frame, is integrally formed with a slideway, a sliding block is arranged in the slideway in a sliding manner, two symmetrically arranged cantilevers are integrally formed on the outer side of the sliding block, one end of a transverse oil cylinder is connected with one end of the front wall, and the other end of the transverse oil cylinder is connected with the cantilevers arranged on the sliding block; one end of the cantilever far away from the front wall is used for being connected with a power chassis, the inclined oil cylinder is hinged above the cantilever, one end of the inclined oil cylinder is used for being connected with the power chassis, and the other end of the inclined oil cylinder is connected with the cantilever.

Optionally, a soil cleaning device is fixedly connected to the lower part of one side of the frame, which is close to the supporting plate, the soil cleaning device comprises a vertical sleeve fixedly connected with the frame through a horizontal rod, a sliding rod is movably arranged in the vertical sleeve in a penetrating manner, the top of the sliding rod is fixedly connected with the inner bottom of the vertical sleeve through a spring, a scraping blade is fixedly connected to the bottom of the sliding rod, and the scraping blade is movably arranged above the spiral wing piece and is in contact connection with the spiral wing piece; the scraping blade is of an arc-shaped sheet structure.

The invention also provides a working method of the difficult site forestation pit digging working head, which comprises the following steps:

step one, equipment is assembled, drill rods with different diameters and spiral angles are replaced according to different soil consistence and soil properties, drill tips and soil cutting blades with different types are replaced, and the rotating speed of the drill rods is adjusted to adapt to different working environments;

step two, starting pit digging operation, and respectively driving rotary motion and feeding motion of a drill rod through a proportional hydraulic system;

and thirdly, the soil cleaning device moves up and down along with the surface of the spiral wing, the drill rod is continuously rotated in the forward and reverse directions, and the scraping blade of the soil cleaning device cleans the accumulated soil on the spiral wing until the pit is cut.

Optionally, in the first step, the method further includes the following steps:

(1) For arid and semiarid areas, a large-diameter drill rod and a lower spiral wing with a small angle are used, a conical small spiral drill point is selected, and the drill rod is switched to high-rotation-speed operation; for the stony desertification area, the drill point adopts a twisted-leaf bifurcation type, adopts a double-blade soil cutting blade, and the drill rod runs at a low rotating speed;

(2) For the saline-alkali soil area, selecting a spiral fin at a large angle, selecting a triangular drill point, selecting a trapezoid soil cutting blade, and switching the rotation speed of a drill rod to a medium rotation speed;

(3) When the planting is performed in the planting ditch according to the planting distance, the power chassis is positioned on the ditch, and the length of the drill rod can be adjusted through expansion and contraction;

(4) In the fish scale pit forestation operation process, selecting a small-diameter lower spiral wing piece and a large-diameter upper spiral wing piece;

(5) When digging holes on the slope, the angle between the supporting plate and the ground is adjusted by adjusting the angle between the connecting frame and the ground, so that the hole digging operation of the slope surface with the angle of more than 25 degrees is realized.

Compared with the prior art, the invention has the following technical effects:

the angle, diameter and length of the spiral wing piece of the drill rod of the working head are conveniently and quickly adjusted, the drill rod blade and the drill tip are quickly replaced, and a soil cleaning device and a hanging mode of the working head are provided. The application method of the working head under different forestation working conditions is provided, so that the working safety of hilly and mountain areas and difficult ground conditions is improved, the working efficiency is improved, and the labor intensity is reduced; the connection part of the gearbox and the drill rod is square hole connection, and the square hole connection can transmit rotary power after being fixed through a pin, so that the connection is convenient; the soil cleaning device can move up and down along with the surfaces of the spiral fins, continuously rotates the pit digging drill rod in the forward and reverse directions, and the scraping blade of the soil cleaning device cleans accumulated soil on the spiral fins; the supporting plate is movably connected on the connecting frame, and different pit digging depths are adjusted in a small range by adjusting the position of the supporting plate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a difficult site forestation pit digging work head according to the present invention;

FIG. 2 is an exploded view of the drill pipe, hydraulic motor and soil cleaning apparatus of the present invention;

FIG. 3 is a schematic view of a frame structure according to the present invention;

FIG. 4 is a schematic cross-sectional view of the drill pipe A-A of the present invention;

FIG. 5 is a schematic view of the installation of a large diameter lower helical fin of the present invention;

FIG. 6 is a schematic view of the installation of a small diameter lower helical fin of the present invention;

FIG. 7 is a schematic view of a wiper blade according to the present invention;

FIG. 8 is a schematic view of the structure of a triangular drill tip of the present invention;

FIG. 9 is a schematic view of a torque She Fencha drill point of the present invention;

FIG. 10 is a schematic view of a tapered auger bit of the present invention;

FIG. 11 is a schematic view of a double-edged soil-cutting blade according to the present invention;

FIG. 12 is a schematic view of a trapezoidal soil cutting blade according to the present invention;

FIG. 13 is a schematic view of a triangular soil cutting blade of the present invention;

FIG. 14 is a schematic view of a chassis hitch plate of the present invention;

FIG. 15 is a schematic view of a working head and power chassis hitch of the present invention;

FIG. 16 is a schematic view showing an upwardly inclined state after the working head of the present invention is hung;

FIG. 17 is a schematic view of the present invention for a ramp and stem up operation;

wherein 100 is a difficult site forestation earth boring working head, 1 is a hydraulic motor, 2 is a gearbox, 3 is a gear shifting handle, 4 is a drill rod, 5 is an upper spiral vane, 6 is a lower spiral vane, 7 is a drill point, 8 is a scraping blade, 9 is a spring, 10 is an earth cleaning device, 11 is a supporting plate, 12 is a connecting frame, 13 is a telescopic inner rod, 14 is a telescopic outer tube, 15 is a chassis hanging plate, 16 is a hydraulic cylinder, 17 is a triangular drill point, 18 is a torsion-leaf bifurcation drill point, 19 is a conical spiral drill point, 20 is a double-blade earth cutting blade, 21 is a trapezoid earth cutting blade, 22 is a triangular earth cutting blade, 23 is a square hole, 24 is a oblique cylinder, 25 is a transverse cylinder, 26 is a front wall, 27 is a double-row threaded hole, 28 is a clamping groove, 29 is a slide, 30 is a slide block, 31 is a cantilever, 32 is a power chassis, 33 is a slope and a ridge.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 1-17, the invention provides a difficult site forestation and pit digging working head 100, which comprises a frame with adjustable height, wherein one side above the frame is connected with a supporting plate 11 through a connecting frame 12, a hydraulic motor 1 is arranged on the supporting plate 11, the bottom of the hydraulic motor 1 is connected with a drill rod 4 through a gearbox 2, and the bottom of the drill rod 4 is used for installing a drill point 7 or a soil cutting blade; the side wall of the drill rod 4 is provided with a spiral wing, the lower part of one side of the frame far away from the supporting plate 11 is fixedly provided with a chassis hanging plate 15, and the chassis hanging plate 15 is used for connecting a power chassis and can also be arranged on other frame type pit diggers for use. The drill rod 4 is telescopic, the lower spiral wing pieces 6 of the drill rod can be replaced, the purpose is to adjust the pit digging diameter and pit digging depth, wing pieces with different spiral angles and soil cutting blades are selected, and the drill tip 7 is convenient to replace. The power output end comprises a gear box, a gear shifting handle 3 is arranged on the gear box 2, and the rotating power of the hydraulic motor 1 can be divided into three high, medium and low gears through the gear box 2 and transmitted to a drill rod 4 so as to adapt to the ground surfaces with different solidities.

Specifically, the frame comprises two symmetrical telescopic outer pipes 14, wherein a telescopic inner rod 13 is movably inserted into the top of each telescopic outer pipe 14, the bottoms of the two telescopic outer pipes 14 are fixedly connected through a bottom connecting rod, the tops of the two telescopic inner rods 13 are fixedly connected through a top connecting rod, and a hydraulic cylinder 16 is connected between the bottom connecting rod and the top connecting rod; the pallet 11 and the connecting frame 12 are arranged on the top links. The top connecting rod bottom is connected with two link 12 that slope set up, and the link 12 inboard is provided with two vertical connecting rods, and two vertical connecting rod bottoms are connected with the A-frame one end, and two link 12 bottoms are connected with the A-frame other end, and the layer board 11 is close to the one end fixed connection of link 12 with the A-frame. The drill rod 4 comprises a first drill rod and a second drill rod, wherein a square hole 23 is formed in the top of the first drill rod, the top of the first drill rod is in transmission connection with the bottom of the gearbox 2 through the square hole 23, the bottom of the first drill rod is in transmission connection with the second drill rod, and the bottom of the second drill rod is used for installing a drill point 7 or a soil cutting blade. The connection part of the gearbox 2 and the first drilling rod is a square hole 23 which is fixed through a pin after connection, and the square hole 23 is connected to transmit rotary power, so that the connection is convenient. The helical fins comprise an upper helical fin 5 and a lower helical fin 6; the upper spiral wing piece 5 is fixedly arranged on the first drill rod, and the lower spiral wing piece 6 is fixedly arranged on the second drill rod; the second drill rod comprises a small-diameter drill rod and a large-diameter drill rod, the small-diameter drill rod is provided with a small-diameter lower spiral wing piece, and the large-diameter drill rod is provided with a large-diameter spiral wing piece.

Preferably, the drill tip 7 is a triangular drill tip 17, a twisted-lobe bifurcated drill tip 18 or a conical helical drill tip 19. The soil cutting blades are double-edge soil cutting blades 20, trapezoid soil cutting blades 21 or triangle soil cutting blades 22; the soil cutting blade is provided with a mounting hole. The lower part of one side of the frame, which is close to the supporting plate 11, is fixedly connected with a soil cleaning device 10, the soil cleaning device 10 comprises a vertical sleeve fixedly connected with the frame through a horizontal rod, a sliding rod is movably penetrated in the vertical sleeve, the top of the sliding rod is fixedly connected with the inner bottom of the vertical sleeve through a spring 9, the bottom of the sliding rod is fixedly connected with a scraping blade 8, and the scraping blade 8 is movably arranged above the spiral wing and is in contact connection with the spiral wing; the wiper blade 8 has an arc-shaped sheet-like structure. The soil cleaning device 10 can move up and down along with the surfaces of the spiral fins, the pit digging drill rod is continuously rotated in the forward and reverse directions, and the scraping blade 8 of the soil cleaning device 10 cleans the accumulated soil on the spiral fins. When the spiral wing is rotated in the operation turning direction (hereinafter referred to as forward rotation), the soil cleaning device 10 moves upwards under the pushing action of the wing, falls to the lower position under the action of the spring after reaching the top end, repeatedly cleans the soil from top to bottom, and if the clay blocks the gap of the spiral wing, the soil cleaning device needs to continuously clean the soil from top to bottom in forward and reverse directions after the pit digging is completed. The soil cleaning device 10 may automatically perform up-and-down, and rotational movements.

The chassis hanging plate 15 mainly comprises a diagonal cylinder 24, a transverse cylinder 25, a front wall 26 and other structures. The front wall 26 is provided with double rows of threaded holes 27 for threaded connection, a clamping groove 28 formed in the top of the front wall 26 is used for transverse positioning, one side of the front wall 26 is provided with a slide way 29, a slide block 30 is slidably connected to the slide way 29, a cantilever 31 is connected to the outer side of the slide block 30, one end of the transverse cylinder 25 is connected with the front wall 26, and the other end of the transverse cylinder is connected with the cantilever 31, so that the front wall 26 can move left and right under the drive of the transverse cylinder 25, and then the working head is driven to move transversely. The cantilever 31 is far away from the front wall 26 and one end is connected with the power chassis 32, one end of the inclined oil cylinder 24 is connected with the power chassis 32, one end is connected with the cantilever 31, and the cantilever 31 drives the working head to move up and down in an inclined mode under the action of the inclined oil cylinder 24. The device has the advantages that the device is favorable for accurate positioning and flexible maneuvering when digging pits under the condition of inconvenient traffic on difficult places; the working angle of the working head can be adjusted when working on the slope and the ridge 33, so that the vertical downward pit digging operation can be realized; after the pit digging operation is completed, the ground clearance of the working head is increased in the walking process; the spiral wing piece of the working head is inclined, so that the soil can be discharged outwards in the soil cleaning action state.

The working head of the invention can be suitable for pit digging operation in the tree planting and forestation process of arid and semiarid, stony desertification, salinization and other areas, and also provides a working method of the pit digging working head for difficult site forestation, which comprises the following steps:

according to different soil consistence and soil property, the drill rod 4 with different diameters and spiral angles, the drill tip 7 with different types and the soil cutting blade can be replaced, and the rotating speed of the drill rod can be finely and coarsely adjusted so as to adapt to different working environments.

The rotary motion and the feed motion of the drill rod 4 are respectively driven by a proportional hydraulic system, and are automatically fed, and the rotating speed and the feed speed are regulated by a button of a hand-held remote controller.

For arid and semiarid regions, the soil is dry and soft, the soil quality is uniform, the pit digging depth needs to be increased, a large-diameter drill rod and a small-angle lower spiral wing can be replaced, a conical small spiral drill point is selected, and the drill rod 4 is switched to high-rotation-speed operation, so that the soil can be discharged outwards.

For stony desertification areas, the soil is hard and complex, a large amount of hard stones randomly exist in the soil, thicker lower spiral fins can be replaced, and the structural rigidity is high; the drill point is a torsion-blade bifurcation drill point 19; the soil cutting blade is a double-edge soil cutting blade 20, and can be turned over for use after being worn; the drill rod 4 is selected to run at a low rotation speed, so that the soil breaking capability is strong, and larger impact with the hard stone is prevented.

For the saline-alkali soil area, the soil is sticky when wet and hard when dry, the soil quality is uniform, the pit depth and the diameter are required to be increased to ensure the implementation of physical improvement measures of the saline-alkali soil, a large-angle lower spiral wing is selected, a triangular drill tip 17 is selected as the drill tip, a trapezoid soil cutting blade 20 is selected as the drill tip, and the rotation speed of the drill rod 4 is switched to a medium rotation speed.

For moist and high-viscosity soil which is easy to adhere to the spiral wing pieces, the soil is cleaned by the rotary motion of the drill rod 4 and the matching of the mechanical soil cleaning device 10.

When the pit is dug and planted in a planting ditch according to a certain planting distance, the power chassis is positioned on the ditch, so that the drill rod 4 has a part of idle stroke, the ideal pit digging depth is not achieved, and the length of the drill rod 4 can be adjusted through telescoping, so that the drill point 7 is adjusted to a reasonable position.

In the fish scale pit forestation operation process, the height of the spiral wing panel can be selected according to the fish scale pit height requirement, and the spiral wing panel with the small diameter is selected. Thus, after drilling, a pit with a step shape with a wide upper part and a narrow lower part is formed, the lower part is used for planting plants, and the upper part is not filled with soil after tree planting is completed, so that the water storage effect is realized.

When digging holes on the slope, the angle between the supporting plate 11 and the ground is finely adjusted by adjusting the angle between the connecting frame 12 and the ground, and the chassis hanging plate 15 on the other side can support the ground to support the power chassis, so that the drill rod 4 is vertical to the ground to dig holes, and the hole digging operation of the slope surface with the angle of more than 25 degrees can be realized.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.

Claims

1. The utility model provides a difficult site forestation earth boring work head which characterized in that: the automatic feeding device comprises a rack capable of controlling feeding movement, wherein one side above the rack is connected with a supporting plate through a connecting frame, a hydraulic motor is arranged on the supporting plate, the bottom of the hydraulic motor is connected with a drill rod through a gearbox, and the bottom of the drill rod is used for installing a drill point or a soil cutting blade; the side wall of the drill rod is provided with a spiral wing piece in a ring mode, the lower portion of one side, away from the supporting plate, of the rack is arranged on a chassis hanging plate, and the chassis hanging plate is used for connecting a power chassis; the drill rod comprises a first drill rod and a second drill rod, a square hole is formed in the top of the first drill rod, the top of the first drill rod is in transmission connection with the bottom of the gearbox through the square hole, the bottom of the first drill rod is in transmission connection with the second drill rod, and the bottom of the second drill rod is used for installing a drill point or a soil cutting blade; the spiral fin comprises an upper spiral fin and a lower spiral fin; the upper spiral wing piece is fixedly arranged on the first drill rod, and the lower spiral wing piece is fixedly arranged on the second drill rod; the second drill rod comprises a small-diameter drill rod and a large-diameter drill rod, the small-diameter drill rod is provided with a small-diameter lower spiral wing piece, and the large-diameter drill rod is provided with a large-diameter spiral wing piece; the soil cleaning device comprises a vertical sleeve fixedly connected with the rack through a horizontal rod, a sliding rod is movably arranged in the vertical sleeve in a penetrating manner, the top of the sliding rod is fixedly connected with the inner bottom of the vertical sleeve through a spring, a scraping blade is fixedly connected with the bottom of the sliding rod, and the scraping blade is movably arranged above the spiral wing piece and is in contact connection with the spiral wing piece; the scraping blade is of an arc-shaped sheet structure.

2. The difficult-to-site forestation pit digging work head of claim 1, wherein: the frame comprises two symmetrical telescopic outer pipes, wherein a telescopic inner rod is movably inserted into the top of each telescopic outer pipe, the bottoms of the two telescopic outer pipes are fixedly connected through a bottom connecting rod, the tops of the two telescopic inner rods are fixedly connected through a top connecting rod, and a hydraulic cylinder is connected between the bottom connecting rod and the top connecting rod; the supporting plate is arranged on the top connecting rod.

3. The difficult-to-site forestation pit digging work head of claim 2, wherein: the bottom end of the top connecting rod is connected with two connecting frames which are obliquely arranged, two vertical connecting rods are arranged on the inner side of each connecting frame, the bottoms of the two vertical connecting rods are connected with one end of a triangular bracket, the bottoms of the two connecting frames are connected with the other end of the triangular bracket, and the supporting plate is fixedly connected with one end, close to the connecting frame, of the triangular bracket; the supporting plate is of a bucket type structure and comprises a bottom plate and reinforcing rib plates; the bottom plate is fixedly connected with the triangular bracket through a vertically arranged connecting plate; the reinforcing rib plates are symmetrically arranged on two sides of the bottom plate; the bottom plate is provided with a connecting through hole, screw holes are uniformly distributed on the outer side of the connecting through hole, and the bottom of the hydraulic motor is in transmission connection with the gearbox through the connecting through hole.

4. The difficult-to-site forestation pit digging work head of claim 1, wherein: the gearbox is a gear box, a gear shifting handle is arranged on the gearbox, the gearbox is controlled by the gear shifting handle, and the rotating power of the hydraulic motor can be divided into high-grade, medium-grade or low-grade and transmitted to the drill rod for adapting to soil with different consistencies.

5. The difficult-to-site forestation pit digging work head of claim 1, wherein: the chassis hanging plate comprises a front wall, an inclined oil cylinder and a transverse oil cylinder; the front wall is uniformly provided with double-row threaded holes for being in threaded connection with the frame, the top of the front wall is provided with a plurality of clamping grooves for transverse positioning, one side of the front wall, which is far away from the frame, is integrally formed with a slideway, a sliding block is arranged in the slideway in a sliding manner, two symmetrically arranged cantilevers are integrally formed on the outer side of the sliding block, one end of a transverse oil cylinder is connected with one end of the front wall, and the other end of the transverse oil cylinder is connected with the cantilevers arranged on the sliding block; one end of the cantilever far away from the front wall is used for being connected with a power chassis, the inclined oil cylinder is hinged above the cantilever, one end of the inclined oil cylinder is used for being connected with the power chassis, and the other end of the inclined oil cylinder is connected with the cantilever.

6. A method of working the hard site forestation and pit digging working head according to any one of claims 1-5, characterized in that: the method comprises the following steps:

7. The method for operating the difficult-to-site forestation and pit digging working head according to claim 6, wherein the method comprises the following steps: in the first step, the method further comprises the following steps: