A combined device for tree-planting pit digging, crushing, stirring and backfilling in the restoration of burned forest areas

Abstract

A combined device for digging, crushing, stirring and backfilling in the restoration of forestation in burned areas. The present invention relates to the technical field of forestation restoration in burned areas. The present invention aims to solve the problems in the prior art that manual forest cleaning in burned areas is time-consuming and laborious, the cost of forestation restoration in forest land is high, and the survival rate of forestation plants is low. The present invention includes a digging unit and a stirring and crushing unit; the stirring and crushing unit is installed on the upper part of the digging unit. The digging unit includes a digging unit housing and a digging mechanism arranged at the lower part of the digging unit housing. The digging unit housing is divided into a motor chamber and a filter screen chamber, and a motor is arranged inside the motor chamber. The present invention is used for the restoration of forestation in burned areas.

Description

Technical Field

[0001] The present invention relates to the technical field of forest restoration and afforestation in burned areas, and particularly relates to a combined device for digging pits, crushing and stirring, and backfilling in the restoration and afforestation of burned areas. Background Art

[0002] A burned area refers to the land in a forest that has been burned by a fire and has not yet grown new forests. The surface of the burned area is severely charred. Currently, in order to better restore the forest land, forest land cleaning is usually carried out before tending and afforestation to improve the survival rate of planting in the replanting area and reduce the difficulty of planting seedlings. When replanting and renewing, in order to improve the drought resistance and survival rate of seedlings, a water retention agent is usually added near the roots of the seedlings during the process of afforestation and transplantation. The coke on the surface of the burned area is a natural pollution-free water retention material after being crushed because of its loose and porous characteristics.

[0003] Currently, seedlings are usually used for replanting in burned areas. Existing tree hole diggers are usually for transplanting big trees, which has the problem of using big equipment for small tasks in actual production. At the same time, because the forest conditions in burned areas are relatively complex, it is difficult to achieve large-scale machine afforestation on the mountain, and manual forest cleaning is time-consuming and laborious. Combining the above problems and technical requirements, how to make full use of the carbonized wood on the surface of the burned area as an afforestation water retention agent on the premise of reducing forest cleaning work, aiming to reduce the cost of restoring and afforesting the existing burned areas and improve the survival rate of afforested plants. Therefore, a combined device for digging pits, crushing and stirring, and backfilling in the restoration and afforestation of burned areas is provided to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art that manual forest cleaning in burned areas is time-consuming and laborious, the cost of forest land restoration and afforestation is high, and the survival rate of afforested plants is low, and further provide a combined device for digging pits, crushing and stirring, and backfilling in the restoration and afforestation of burned areas.

[0005] The technical solution adopted by the present invention to solve the above problems is: a combined device for digging pits, crushing and stirring, and backfilling in the restoration and afforestation of burned areas, including a pit-digging unit and a stirring and crushing unit; the stirring and crushing unit is installed on the upper part of the pit-digging unit. The pit-digging unit includes a pit-digging unit housing and a pit-digging mechanism arranged at the lower part of the pit-digging unit housing. The pit-digging unit housing is divided into a motor chamber and a filter screen chamber. A motor is arranged inside the motor chamber. The stirring and crushing unit includes a stirring and crushing unit housing. The interior of the stirring and crushing unit housing is divided into a crushing chamber and a storage tank. A crushing mechanism is arranged inside the crushing chamber, and a suction fan is arranged inside the storage tank. The motor drives the pit-digging mechanism, the crushing mechanism, and the suction fan through a transmission unit.

[0006] Preferably, the pit-digging mechanism includes a suction pipe and a main shaft. The suction pipe is connected to the lower part of the pit-digging unit housing. The main shaft is arranged inside the suction pipe. The upper end of the main shaft is connected to the transmission unit, and a spiral blade is arranged at the lower end.

[0007] Preferably, a plurality of filter screens are arranged inside the filter screen cavity.

[0008] Preferably, the crushing mechanism includes a main crushing rotor and a secondary crushing rotor. Crushing blades are arranged on both the main crushing rotor and the secondary crushing rotor. The height of the driving shaft of the secondary crushing rotor is lower than that of the driving shaft of the main crushing rotor in the vertical direction, and the rotational speed of the secondary crushing rotor is less than that of the main crushing rotor.

[0009] Preferably, an air suction adjustment port knob is further arranged inside the housing of the stirring and crushing unit. A partition is installed between the crushing cavity and the storage tank. An air suction adjustment port is opened on the partition. An air suction hose is arranged on the air suction machine. The air suction hose is communicated with the air suction adjustment port. One end of the air suction adjustment port knob is rotatably connected to the partition, and the other end is arranged outside the air suction adjustment port away from the air suction hose.

[0010] Preferably, one end of the bottom wall of the storage tank away from the air suction adjustment port is inclined downward, and the included angle between the bottom wall and the horizontal plane is 30° - 50°.

[0011] Preferably, a discharge port is opened at the end of the inclined side of the bottom wall, and a discharge hose is installed below the discharge port.

[0012] Preferably, the transmission unit includes a motor gear, a worm, a turbine, an air suction machine pulley, a main crushing rotor pulley, a main crushing rotor gear, a speed-changing gear, a secondary crushing rotor gear, an intermediate gear, and a main shaft gear;

[0013] The motor gear is installed on the output shaft of the motor. The end of the output shaft is connected to the worm. The worm meshes with the turbine. The turbine and the air suction machine pulley are connected to the same shaft. The air suction machine pulley and the main crushing rotor pulley are driven by a belt. The main crushing rotor pulley and the main crushing rotor gear are jointly connected to the driving shaft of the main crushing rotor. The main crushing rotor gear meshes with the speed-changing gear. The speed-changing gear meshes with the secondary crushing rotor gear. The secondary crushing rotor gear is connected to the driving shaft of the secondary crushing rotor. The motor gear meshes with the intermediate gear. The intermediate gear meshes with the main shaft gear. The main shaft gear is connected to the main shaft.

[0014] Preferably, the worm and the output shaft of the motor are connected by a coupling.

[0015] Preferably, a machine handle is further installed outside the housing of the pit-digging unit and the housing of the stirring and crushing unit.

[0016] The present invention has the following beneficial technical effects:

[0017] The present invention is a combined structure, which is convenient for field carrying. At the same time, according to different purpose requirements, the working units can be freely combined to respectively achieve different operation purposes such as excavation, crushing and stirring, and backfilling. The present invention only installs a suction pipe, a main shaft, a spiral blade, a filter screen cavity and a motor structure to realize the function of individual pit-digging operation. The discharge hose of the device can also be removed to only perform the functions of pit-digging and crushing and stirring. The present invention is used for seeding afforestation in burned areas, and the operation unit is more flexible and convenient than the existing excavator.

[0018] Compared with the single-rotor crushing of conventional crushers, the present invention adopts a double-crushing rotor structure with different speeds. The main shafts of adjacent crushing rotors are arranged in parallel, ensuring that the directions of the adjacent linear velocities of the two adjacent crushing rotors are exactly opposite, which can greatly destroy the formation of air circulation, improve the uniformity and efficiency of material crushing, and the crushed particle size of the soil-charcoal mixture excavated and preliminarily crushed is uniform.

[0019] An air suction hose is arranged on the air suction fan of the present invention. The air suction hose is communicated with the air suction adjustment port. The air suction adjustment port knob is rotatably connected to the partition board. The air suction adjustment port knob covers the upper part of the air suction adjustment port. Rotating the air suction adjustment port knob can adjust the air intake volume of the air suction adjustment port, and the flow rate of the excavation mixture in the whole machine can be adjusted through the air suction adjustment port, so as to achieve a more sufficient and efficient crushing and stirring effect. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a schematic structural diagram of the pit-digging unit and the stirring and crushing unit assembled and disassembled with the discharge hose removed;

[0022] Figure 3 is a schematic structural diagram of the pit-digging unit;

[0023] Figure 4 is a schematic exploded view of the present invention;

[0024] Figure 5 is a schematic internal structure diagram of the storage bin;

[0025] Figure 6 is a schematic diagram of the combined structure of each unit of the present invention;

[0026] Figure 7 is a schematic internal structure diagram of the filter screen cavity and the crushing cavity;

[0027] Figure 8 is a schematic diagram of the principle of adjusting the air intake volume of the air suction hose by the air suction adjustment port knob;

[0028] Figure 9 is the transmission principle diagram of the present invention;

[0029] In the figure: 1, digging unit; 2, stirring and crushing unit; 3, housing of the digging unit; 4, housing of the stirring and crushing unit; 5, machine handle; 6, suction pipe; 7, main shaft; 8, spiral blade; 9, discharge port; 10, discharge hose; 11, filter screen cavity; 12, motor; 13, crushing cavity; 14, suction fan; 15, storage bin; 16, air suction adjustment port; 17, air suction adjustment port knob; 18, filter screen; 19, main crushing rotor; 20, secondary crushing rotor; 21, crushing blade;

[0030] 22, motor gear; 23, coupling; 24, worm; 25, turbine; 26, belt pulley of the suction fan; 27, belt; 28, belt pulley of the main crushing rotor; 29, gear of the main crushing rotor; 30, speed change gear; 31, gear of the secondary crushing rotor; 32, intermediate gear; 33, gear of the main shaft; 34, air suction hose; 35, annular channel. Specific embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings of the specification and embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] Specific embodiment 1: In combination with Figures 1 to 9 This embodiment is described. The combined device for digging, crushing and stirring, and backfilling for restoring forestation in burned areas of the present embodiment includes a digging unit 1 and a stirring and crushing unit 2;

[0033] The stirring and crushing unit 2 is installed on the upper part of the digging unit 1. The digging unit 1 includes a housing 3 of the digging unit and a digging mechanism provided at the lower part of the housing 3 of the digging unit. The housing 3 of the digging unit is divided into a motor chamber and a filter screen cavity 11. A motor 12 is provided inside the motor chamber. The stirring and crushing unit 2 includes a housing 4 of the stirring and crushing unit. The interior of the housing 4 of the stirring and crushing unit is divided into a crushing cavity 13 and a storage bin 15. A crushing mechanism is provided inside the crushing cavity 13. A suction fan 14 is provided inside the storage bin 15. The motor 12 drives the digging mechanism, the crushing mechanism and the suction fan 14 through a transmission unit.

[0034] In a preferred embodiment, the digging mechanism includes a suction pipe 6 and a main shaft 7. The suction pipe 6 is connected to the lower part of the housing 3 of the digging unit. The main shaft 7 is arranged inside the suction pipe 6. The upper end of the main shaft 7 is connected to the transmission unit, and a spiral blade 8 is provided at the lower end.

[0035] In a preferred embodiment, a plurality of filter screens 18 are provided inside the filter screen chamber 11.

[0036] In a preferred embodiment, the crushing mechanism includes a main crushing rotor 19 and a secondary crushing rotor 20. Crushing blades 21 are provided on both the main crushing rotor 19 and the secondary crushing rotor 20. The height of the drive shaft of the secondary crushing rotor 20 is lower than that of the drive shaft of the main crushing rotor 19 in the vertical direction, and the rotational speed of the secondary crushing rotor 20 is less than that of the main crushing rotor 19.

[0037] In a preferred embodiment, an air suction adjustment knob 17 is further provided inside the housing 4 of the stirring and crushing unit. A partition is installed between the crushing chamber 13 and the storage bin 15. An air suction adjustment opening 16 is formed on the partition. An air suction hose 34 is provided on the air suction machine 14. The air suction hose 34 is communicated with the air suction adjustment opening 16. One end of the air suction adjustment knob 17 is rotatably connected to the partition, and the other end is provided on the outer side of the air suction adjustment opening 16 away from the air suction hose 34.

[0038] In a preferred embodiment, one end of the bottom wall of the storage bin 15 away from the air suction adjustment opening 16 is inclined downward, and the included angle between the bottom wall and the horizontal plane is 30° - 50°.

[0039] In a preferred embodiment, a discharge port 9 is formed at the end of the inclined side of the bottom wall, and a discharge hose 10 is installed below the discharge port 9.

[0040] In a preferred embodiment, the transmission unit includes a motor gear 22, a worm 24, a turbine 25, an air suction machine pulley 26, a main crushing rotor pulley 28, a main crushing rotor gear 29, a speed change gear 30, a secondary crushing rotor gear 31, an intermediate gear 32, and a main shaft gear 33;

[0041] The motor gear 22 is installed on the output shaft of the motor 12. The end of the output shaft is connected to the worm 24. The worm 24 meshes with the turbine 25. The turbine 25 and the air suction machine pulley 26 are connected to the same shaft. The air suction machine pulley 26 and the main crushing rotor pulley 28 are driven by a belt 27. The main crushing rotor pulley 28 and the main crushing rotor gear 29 are commonly connected to the drive shaft of the main crushing rotor 19. The main crushing rotor gear 29 meshes with the speed change gear 30. The speed change gear 30 meshes with the secondary crushing rotor gear 31. The secondary crushing rotor gear 31 is connected to the drive shaft of the secondary crushing rotor 20. The motor gear 22 meshes with the intermediate gear 32. The intermediate gear 32 meshes with the main shaft gear 33. The main shaft gear 33 is connected to the main shaft 7.

[0042] In a preferred embodiment, the worm 24 and the output shaft of the motor 12 are connected by a coupling 23.

[0043] In a preferred embodiment, a machine handle 5 is further installed outside the housing 3 of the pit-digging unit and the housing 4 of the stirring and crushing unit.

[0044] Specific Embodiment 2: In combination Figures 1 to 9 To illustrate this embodiment, in a preferred embodiment of this embodiment, the transmission unit includes a motor gear 22, a worm 24, a turbine 25, a blower pulley 26, a main crushing rotor pulley 28, a main crushing rotor gear 29, a speed-changing gear 30, a secondary crushing rotor gear 31, an intermediate gear 32, and a main shaft gear 33;

[0045] The motor gear 22 is installed on the output shaft of the motor 12. The end of the output shaft is connected to the worm 24. The worm 24 meshes with the turbine 25. The turbine 25 and the blower pulley 26 are connected to the same shaft. The blower pulley 26 and the main crushing rotor pulley 28 are driven by a belt 27. The main crushing rotor pulley 28 and the main crushing rotor gear 29 are jointly connected to the drive shaft of the main crushing rotor 19. The main crushing rotor gear 29 meshes with the speed-changing gear 30. The speed-changing gear 30 meshes with the secondary crushing rotor gear 31. The secondary crushing rotor gear 31 is connected to the drive shaft of the secondary crushing rotor 20. The motor gear 22 meshes with the intermediate gear 32. The intermediate gear 32 meshes with the main shaft gear 33. The main shaft gear 33 is connected to the main shaft 7.

[0046] The motor gear 22, the intermediate gear 32, and the main shaft gear 33 are installed inside the housing 3 of the pit-digging unit; the worm 24, the turbine 25, the blower pulley 26, the main crushing rotor pulley 28, the main crushing rotor gear 29, the speed-changing gear 30, and the secondary crushing rotor gear 31 are installed inside the housing of the stirring and crushing unit.

[0047] In a preferred embodiment, the number of teeth of the main crushing rotor gear 29 is less than that of the speed-changing gear 30. The pitch circle diameters and the number of teeth of the speed-changing gear 30 and the secondary crushing rotor gear 31 are the same. The transmission from the main crushing rotor gear 29 to the speed-changing gear 30 is a speed-reducing transmission. The height of the drive shaft of the secondary crushing rotor 20 is lower than that of the drive shaft of the main crushing rotor 19 in the vertical direction. The rotational speed of the secondary crushing rotor 20 is less than that of the main crushing rotor 19.

[0048] In a preferred embodiment, the worm 24 and the output shaft of the motor 12 are connected by a coupling 23. When the stirring and crushing unit 2 is mounted on the upper part of the pit-digging unit 1, the connection between the worm 24 and the motor 12 can be realized, and power can be provided for the stirring and crushing unit 2 by the motor 12.

[0049] In this embodiment, the worm 24 and the output shaft of the motor 12 are connected by a coupling 23, which can realize the quick connection between the worm 24 and the motor 12, and the digging unit 1 provides power for the stirring and crushing unit 2. A protective shell is arranged outside the meshing of the intermediate gear 32 and the main shaft gear 33 to prevent the mixture dug up by the spiral blade 8 from jamming the gear. An annular channel 35 is also arranged between the suction pipe 6 and the filter screen 18, and the mixture dug up by the spiral blade 8 is transported to the filter screen 18 through the annular channel 35 for filtering, and the filtered mixture enters the crushing chamber 13 for crushing.

[0050] As Figure 1 shown, the device A that integrates excavation, stirring and crushing, and backfilling; as Figure 3 shown, only the suction pipe 6, the main shaft 7, the spiral blade 8, the filter screen chamber 11 and the motor 12 can be installed to realize the separate digging operation device B; as Figure 2 shown, the discharge hose 10 of the device A can also be removed to be only a digging, crushing and stirring device.

[0051] In this embodiment, the gears, the housing and the shaft of the transmission unit are all made of non-metallic materials such as engineering plastics, and the housing 3 of the digging unit and the housing 4 of the stirring and crushing unit are also made of non-metallic materials, with light mass and self-weight, which is convenient to carry up the mountain.

[0052] Other compositions and connection relationships are the same as those in the first specific embodiment.

[0053] Specific embodiment three: Combining Figures 1 to 9 to illustrate this embodiment. In this embodiment, the device of the present invention is a portable combined structure, including a machine handle 5, a suction pipe 6, a main shaft 7, a spiral blade 8, an operation host, a discharge port 9 and a discharge hose 10. The operation host is composed of a filter screen chamber 11, a motor 12, a crushing chamber 13, a suction fan 14, a storage tank 15 and a suction air adjustment port. The motor 12 is the power output of this installed machine, and it provides power support for the suction fan 14, the main crushing rotor 19 and the auxiliary crushing rotor 20.

[0054] The main shaft 7 and the spiral blade 8 of this device are one unit, the metal suction pipe 6 is one unit, the discharge hose 10 is one unit, and the filter screen chamber 11, the motor 12, the crushing chamber 13, the suction fan 14 and the storage tank 15 are each one unit. They are disassembled and placed before work and freely assembled as needed during use. As Figure 1 shown, the device A that integrates excavation, stirring and crushing, and backfilling; as Figure 3 shown, only the suction pipe 6, the main shaft 7, the spiral blade 8, the filter screen chamber 11 and the motor 12 can be installed to realize the separate digging operation device B; as Figure 2 shown, the discharge hose 10 of the device A can also be removed to be only a digging, crushing and stirring device.

[0055] The metal suction pipe 6 of this device is a hollow pipe, with a main shaft 7 and a spiral blade 8 installed inside. The upper part of the suction pipe 6 is hermetically connected to the filter screen chamber 11. The diameter of the metal suction pipe 6 is about 20 cm. There is also a telescopic mechanism on the main shaft 7 that can control the lifting of the main shaft 7. The telescopic mechanism adopts existing technology. One end of the metal suction pipe 6 away from the filter screen chamber 11 is a metal structure with an inward-converging inclination angle and a blade at the bottom. The angle between the inward-converging metal wall and the ground perpendicular is 10°-20°.

[0056] The filter screen chamber 11 of this device is composed of filter screens of different thicknesses. Before starting the operation, an appropriately thick or thin filter screen 18 is selected according to the actual situation of the burned forest land and installed in the filter screen chamber 11. Its main function is to allow the soil-charcoal mixture that has been excavated and preliminarily crushed to pass through, while filtering out the large stones that cannot be crushed.

[0057] There are two crushing rotors installed in the filter screen chamber 11 of this device, and the crushing rotors have different speeds. The speed of the secondary crushing rotor 20b is less than that of the main crushing rotor 19a. The secondary crushing rotor 20b is close to the filter screen chamber 11, and the main crushing rotor 19a is close to the suction fan 14. The power of the two rotors is driven by the motor 12. Both the main crushing rotor 19a and the secondary crushing rotor 20b are composed of crushing blades 21 and crushing rotor drive shafts. The horizontal position of the drive shaft of the secondary crushing rotor 20b is lower than that of the drive shaft of the main crushing rotor 19a. Through the above design, the problem that part of the soil-charcoal mixture cannot be evenly crushed due to centrifugal force during the crushing process can be solved. At the same time, better step-by-step crushing and stirring can be achieved through the different speeds of the main crushing rotor 19a and the secondary crushing rotor 20b.

[0058] The air suction adjustment port 16 of this device is the connection part between the suction fan 14 and the crushing chamber 13, and it is a knob device for adjusting the air suction volume. It is composed of an air suction adjustment port knob 17 and an air suction hose 34. The air intake size of the air suction adjustment port 16 is adjusted through the air suction adjustment port knob 17, thereby changing the air suction volume. The soil-charcoal mixture enters the suction fan 14 through the air suction hose 34, and then enters the storage tank 15 through the air outlet pipe of the suction fan 14, further affecting the feeding speed of the excavated material in the sealed metal suction pipe 6, and ensuring that the fed excavated material can be fully crushed in the crushing chamber 13.

[0059] The storage tank 15 of this device is the cavity at the other air outlet end connected to the suction fan 14. It is placed at the rear of the crushing chamber 13. Its main function is to transfer and store the mixture that has been crushed inside the crushing chamber 13 through the suction fan 14 to the final stirring and crushing cavity. The bottom of the storage tank 15 is inclined, and the angle with the horizontal plane is 30°-50°. A discharge port 9 is provided at the lowest point of the bottom surface, and a discharge hose 10 can be connected when needed to backfill the crushed and stirred mixture into the excavated tree pit.

[0060] Other components and connection relationships are the same as those in the first specific implementation manner.

[0061] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A combined device for tree-planting pit digging, crushing, stirring and backfilling in the restoration of forest land burned by fire, characterized in that: It includes a pit-digging unit (1) and a stirring and crushing unit (2); the stirring and crushing unit (2) is installed on the upper part of the pit-digging unit (1), the pit-digging unit (1) includes a pit-digging unit housing (3) and a pit-digging mechanism arranged at the lower part of the pit-digging unit housing (3), the pit-digging unit housing (3) is divided into a motor chamber and a filter screen chamber (11), and a motor (12) is arranged inside the motor chamber; The stirring and crushing unit (2) includes a stirring and crushing unit housing (4), the interior of the stirring and crushing unit housing (4) is divided into a crushing chamber (13) and a storage bin (15), a crushing mechanism is arranged inside the crushing chamber (13), a suction fan (14) is arranged inside the storage bin (15), and the motor (12) drives the pit-digging mechanism, the crushing mechanism and the suction fan (14) through a transmission unit; The crushing mechanism includes a main crushing rotor (19) and a secondary crushing rotor (20), crushing blades (21) are arranged on both the main crushing rotor (19) and the secondary crushing rotor (20), the height of the driving shaft of the secondary crushing rotor (20) is lower than that of the driving shaft of the main crushing rotor (19) in the vertical direction, and the rotation speed of the secondary crushing rotor (20) is less than that of the main crushing rotor (19); An air suction adjustment port knob (17) is further arranged inside the stirring and crushing unit housing (4), a partition is installed between the crushing chamber (13) and the storage bin (15), an air suction adjustment port (16) is opened on the partition, an air suction hose (34) is arranged on the suction fan (14), the air suction hose (34) is communicated with the air suction adjustment port (16), one end of the air suction adjustment port knob (17) is rotatably connected to the partition, and the other end is arranged outside the air suction adjustment port (16) away from the air suction hose (34); The transmission unit includes a motor gear (22), a worm (24), a turbine (25), a suction fan pulley (26), a main crushing rotor pulley (28), a main crushing rotor gear (29), a speed-changing gear (30), a secondary crushing rotor gear (31), an intermediate gear (32) and a main shaft gear (33); The motor gear (22) is installed on the output shaft of the motor (12), the end of the output shaft is connected to the worm (24), the worm (24) is meshed with the turbine (25), the turbine (25) and the suction fan pulley (26) are connected to the same shaft, the suction fan pulley (26) and the main crushing rotor pulley (28) are driven by a belt (27), the main crushing rotor pulley (28) and the main crushing rotor gear (29) are jointly connected to the driving shaft of the main crushing rotor (19), the main crushing rotor gear (29) is meshed with the speed-changing gear (30), the speed-changing gear (30) is meshed with the secondary crushing rotor gear (31), the secondary crushing rotor gear (31) is connected to the driving shaft of the secondary crushing rotor (20), the motor gear (22) is meshed with the intermediate gear (32), the intermediate gear (32) is meshed with the main shaft gear (33), and the main shaft gear (33) is connected to the main shaft (7).

2. The combined device for digging pits, crushing, stirring and backfilling in the restoration of forestation in burned areas according to claim 1, wherein: The pit-digging mechanism includes a suction pipe (6) and a main shaft (7). The suction pipe (6) is connected to the lower part of the pit-digging unit housing (3). The main shaft (7) is arranged inside the suction pipe (6). The upper end of the main shaft (7) is connected to the transmission unit, and a spiral blade (8) is arranged at the lower end.

3. The combined device for digging, crushing, stirring and backfilling in the restoration and afforestation of burned areas according to claim 1, characterized in that: A plurality of filter screens (18) are arranged inside the filter screen cavity (11).

4. The combined device for digging, crushing, stirring and backfilling in the restoration of forestation in burned areas according to claim 1, characterized in that: One end of the bottom wall of the storage box (15) far from the air suction adjustment port (16) slopes downward, and the included angle between the bottom wall and the horizontal plane is 30° - 50°.

5. The combined device for digging, crushing, stirring and backfilling in the restoration of forestation in burned areas according to claim 4, characterized in that: A discharge port (9) is formed at the end of the inclined side of the bottom wall, and a discharge hose (10) is installed below the discharge port (9).

6. The combined device for digging, crushing, stirring and backfilling in the restoration of forestation in burned areas according to claim 1, characterized in that: The worm (24) and the output shaft of the motor (12) are connected by a coupling (23).

7. The combined device for digging, crushing, stirring and backfilling in the restoration of forestation in burned areas according to claim 1, characterized in that: A machine handle (5) is further installed outside the pit-digging unit housing (3) and the stirring and crushing unit housing (4).

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