Straw rotary throwing, crushing and in-situ burning returning all-in-one machine

Abstract

The invention discloses a straw rotary throwing, crushing, in-situ burning and returning all-in-one machine which comprises a power assembly, a stubble cleaning assembly, a ploughing and burying assembly, a frame, a burning assembly and a flue gas treatment assembly. The stubble cleaning assembly comprises a rotary driving roller and a stubble cleaning part, and the rotary driving roller drives the stubble cleaning part to throw straw from bottom to top in the advancing direction of the whole machine. The burning assembly comprises a semi-closed burning shell with a downward opening and at least one group of flame nozzles, and straws crushed and thrown by the stubble cleaning assembly pass through a flame area ejected by the flame nozzles; and the flue gas treatment assembly comprises a negative pressure fan for forming a negative pressure environment in the burning shell and a flue gas treatment unit. The stubble cleaning machine has the beneficial effects that stubbles left on the earth surface and straw scattered in a field are smashed in the stubble cleaning process, after multi-stage suspension burning, the burnt straw is buried into soil through the ploughing and burying assembly, and meanwhile flue gas in the treatment process is treated through the flue gas treatment assembly; the purpose of efficiently treating a large amount of surplus straw on the premise of not polluting the environment is achieved.

Description

Technical Field

[0001] The invention relates to a crop straw processing machine, in particular to a straw rotary throwing, crushing and on-site burning and returning machine, belonging to the technical field of agricultural machinery. Background Art

[0002] Straw is the general term for the stems and leaves (ears) of mature crops. Straw usually refers to the remaining part of wheat, rice, corn, potatoes, rapeseed, cotton and other crops after the seeds are harvested. More than half of the products of crop photosynthesis are present in the straw, which is rich in nitrogen, phosphorus, potassium, calcium, magnesium and organic matter.

[0003] Farmers have a long history of using crop straw, but due to the low agricultural production level and low yield in the past, the amount of straw was small. Except for a small amount of straw used as bedding, feeding livestock, and some used for composting, most of the straw was burned as fuel. With the development of agricultural production, grain output has increased significantly, the amount of straw has also increased, and the promotion of firewood and coal saving technology, the popularization of coal burning and the use of liquefied gas have resulted in a large amount of surplus straw in rural areas.

[0004] Therefore, the treatment of surplus straw has become a major problem in the development of agriculture in my country. From the perspective of agricultural development, returning straw to the field is the most favorable treatment method. At present, there are many forms of returning straw to the field, which can be divided into direct return to the field and indirect return to the field.

[0005] Indirect return to the fields includes general composting and returning to the fields through the stomach. The indirect return to the fields has the problem of difficulty and high cost in collecting straw, and there is also the problem of long processing cycle.

[0006] Direct return to the field is divided into two types: turning over and pressing the crop straw and covering the field. Turning over and pressing the crop straw means turning the crop straw into the soil after the crop is harvested and before sowing or transplanting the next crop. Covering the field means directly covering the crop straw or stubble on the soil surface. The straw will only be weathered and corroded. It will be considered returned to the field only after it is turned over and buried in the soil during the next tillage. Whether it is returning the straw to the field by covering or turning over the straw, the amount of straw returned to the field must be considered. If the amount of straw is too much, it will not be conducive to the decay of the straw, and may even affect the emergence or growth of seedlings, resulting in a reduction in crop yields. The existing direct return of straw to the field technology has the problem that it cannot be directly returned to the field, and there will be a large amount of excess straw that cannot be handled. At the same time, direct return of straw to the field also has the problem of pests and diseases, which will increase the use of pesticides.

[0007] Traditional burning and returning land to the field is divided into two categories: centralized burning and on-site burning. Centralized burning can solve the smoke and dust problem during the burning process, but there are also problems of difficulty and high cost in picking up and collecting straw.

[0008] The reason why burning straw in the field affects the environment is mainly because straw is dense, has a high moisture content, and has a certain thickness of accumulation on the surface, making it difficult to create a good burning environment. Therefore, incomplete combustion will produce a large amount of smoke and pollutant emissions. And because it is uncontrollable combustion in an open environment, there is also a great risk of fire. Fire accidents caused by burning straw in the field occur from time to time.

[0009] Although on-site incineration will produce a large amount of smoke, cause environmental pollution and pose a fire risk, it is the most efficient and powerful way to deal with surplus straw. The potassium, calcium, inorganic salts and trace elements remaining after incineration can be used by plants, and insect eggs, pathogens and grass seeds are killed during the burning process.

[0010] Chinese patent CN118009332A discloses a mobile straw field burning carbonization and field return integrated machine. During the forward movement of the machine, the straw loosening device runs clockwise, and the straw attached to the ground surface and the grass seeds and eggs carried therein are taken off the ground and run to the rear of the loosening device. The ignition device ignites the straw before the straw falls to the ground. A fire throwing roller is installed at the rear end of the straw loosening device. The fire throwing roller rotates clockwise at high speed to throw the burning straw on the upper layer forward to ensure that the straw can continue to be ignited after the igniter is ignited and when the igniter is not working. The machine moves forward, and the ignited straw enters the carbonization chamber, and the straw burns on the ground surface. A secondary loosening roller is provided at the rear part of the carbonization chamber. The secondary straw loosening roller is connected to the fire barrier plate to further loosen the straw to avoid unburned straw, grass seeds, etc., to ensure uniform combustion and uniform heating, and better insecticide and sterilization. The straw that has been burned to a certain extent is returned to the soil under the action of the rotary tillage device, and the straw that has not been completely burned uses its own residual heat to further carbonize in the oxygen-deficient environment under the soil layer.

[0011] This scheme adopts the principle of stacking and burning of straw after loosening and igniting it. This scheme is just picking up, without crushing process; therefore, its ignition and burning speed will be relatively slow, which will seriously restrict its operation speed and cannot be promoted in areas with short cropping cycle. . In addition, this scheme has high requirements for the size and dryness of straw. For larger fresh straw, there is a problem that it cannot be ignited and burned continuously. In addition, the flue gas treatment device adopts a centrifugal separation device and a pull-out core replacement device, which cannot effectively control large-size particles in the smoke. The amount of smoke during operation is very large, and the filter element is easy to be blocked, and the filter element needs to be replaced frequently, which increases the cost of use.

[0012] Chinese patent CN119138190A discloses an automatic straw collection and underground burning and returning to the field equipment, which uses a collecting shovel to cut and collect straw, cleans and presses the soil and stones in the collected straw through a processing mechanism, crushes the pressed straw into straw debris, sprays fuel particles on the straw debris, and burns the crushed straw by backfilling it into a ditch and covering it with soil.

[0013] However, the collecting shovel of this solution is set at the front end of the vehicle body and tilted upward from front to back. The collecting shovel cannot cut off the stubble and will be inserted into the soil, causing a large amount of soil to enter the processing mechanism and affect the processing efficiency; the complex structure and process of this solution seriously affect the straw processing efficiency and cannot be adapted to the application in areas with a short stubble cycle; burning in a covered state still has the problem of untreated smoke overflow affecting the environment, and there is also the problem of uncontrolled burning, posing a safety hazard of causing forest fires. Summary of the invention

[0014] Purpose of the invention: The purpose of the present invention is to provide a straw rotary throwing, crushing and on-site burning and returning machine to the field in order to solve the problems existing in the prior art. The stubble left after harvest and the straw scattered in the field are crushed during the stubble killing process, and the incinerated straw is buried in the soil by the tillage and burial assembly after multi-stage hanging burning. At the same time, the flue gas in the treatment process is treated by the flue gas treatment assembly, so as to achieve the purpose of efficiently and massively treating the surplus straw without polluting the environment.

[0015] Technical solution: A straw rotary throwing, crushing and in-situ burning and returning machine, comprising a power assembly, a stubble destroying assembly, a tillage burying assembly, a frame, a burning assembly and a flue gas treatment assembly; the power assembly provides power to the stubble destroying assembly, the tillage burying assembly, the burning assembly and the flue gas treatment assembly respectively, and the stubble destroying assembly and the tillage burying assembly are fixedly mounted on the frame from front to back at the same time; The stubble-chopping assembly comprises a rotating driving roller and a stubble-chopping part arranged on the circumferential surface of the rotating driving roller. The rotating driving roller drives the stubble-chopping part to throw the straw from bottom to top along the forward direction of the whole machine.

[0016] The incineration assembly comprises an incineration shell with an opening that is half closed downward and at least one group of flame nozzles. The stubble-chopping assembly is located in the incineration shell, and the flame nozzles are installed on the inner side of the incineration shell. The straw that is crushed and thrown by the stubble-chopping assembly passes through the flame area sprayed by the flame nozzles. The flue gas treatment assembly comprises a negative pressure fan for forming a negative pressure environment in the incineration shell and a flue gas treatment unit. The flue gas treatment unit is connected to the inside of the incineration shell through the negative pressure fan.

[0017] At present, common stubble destroyers usually adopt clockwise rotation and counterclockwise rotation to prevent smoke and dust from spreading to the front cab. The present invention adopts a counter-rotating stubble destroying assembly to hammer and rotate the stubble and broken straw on the surface and send them in a clockwise counter-rotating hammer, gradually breaking them into flocs; the flocculent straw passes through the incineration assembly, is burned and suspended for spontaneous combustion, and at the same time, the pathogens, insect eggs and weed seeds attached to the straw are fully burned and inactivated; the wood ash and unburned straw fall to the ground and then enter the tillage and burying assembly, and are mixed and buried into the soil, and the unburned straw on the surface and shallow soil continues to burn or smolder, and the integration of the stubble destroying assembly and the tillage and burying assembly improves the working efficiency; the negative pressure fan collects the dust generated by stubble destroying and rotary tillage, the smoke generated by incineration and the smoke generated by the burning or smoldering of unburned straw, and then centrally treats them through the smoke treatment unit; the purpose of processing surplus straw in large quantities and efficiently without polluting the environment is achieved.

[0018] The present invention realizes efficient treatment of straw by integrating the stubble destroying assembly with the incineration assembly. It is no longer simply piled up and burned. Its main function is to treat the wax layer on the surface of the straw through physical crushing and high temperature of flame, destroy its structure, improve its biodegradability and enzymatic hydrolysis efficiency, and thus increase the composting efficiency after being buried in the soil.

[0019] At the same time, the inactivation of pathogens, insect eggs and weed seeds by the present invention mainly relies on the burning flame rather than the spontaneous combustion of the straw, which has a higher temperature and a faster inactivation speed. Even if the straw is not burned due to excessively high moisture content, it does not affect the inactivation effect of the burning flame on the pests and diseases.

[0020] Preferably, in order to effectively form a negative pressure environment to centrally treat the smoke that pollutes the environment and realize the controllable burning of straw, the burning shell includes a burning shell body, a front closing device installed at the front end of the burning shell body, side panels located on both sides of the burning shell body, and a rear closing device installed at the rear end of the burning shell body. The front closing device, the rear closing device, and the side panels on both sides of the burning shell body are respectively fitted to the ground. A semi-enclosed chamber is formed with the opening facing downward, and the entire burning chamber is approximately in a sealed state, which is more conducive to forming a negative pressure environment to centrally treat the smoke that pollutes the environment. At the same time, the burning flame and the straw are controllably burned in the burning chamber to prevent the flame from overflowing.

[0021] Preferably, in order to prevent the fire from jumping out and igniting the peripheral straw, the side plates on both sides of the incineration shell body are provided with a plowboard structure, and the plowboard structures on both sides plow toward both sides along the forward direction. In the working state, the plowboard structure plows into the soil 1cm-2cm to achieve a better sealing effect; during the movement of the whole machine, the plowing action of the plowboard structure separates the straw on both sides from the incineration shell, thereby effectively preventing the fire from jumping out and igniting the peripheral straw.

[0022] Preferably, in order to improve operating efficiency and reduce costs, the stubble destroying assembly and the tillage burying assembly are simultaneously located inside the incineration shell. The present invention installs the stubble destroying assembly and the tillage burying assembly simultaneously inside the incineration shell of the integral structure. The stubble and broken straw on the surface are hammered by the stubble destroying assembly and burned by the incineration assembly, and then directly buried and pressed into the soil by the tillage burying assembly. The straw crushing, throwing, burning and tillage burying are synchronized, which effectively improves operating efficiency. The cost of agricultural machinery is also one of the important factors affecting the promotion of equipment. The present invention adopts an integral incineration shell structure to make the structure simpler and the manufacturing cost lower, which can effectively reduce the overall cost.

[0023] Preferably, in order to improve the inactivation effect of pests and diseases and to facilitate the collection of smoke, a partition device is provided inside the incineration shell, and the partition device is arranged in the longitudinal direction to divide the interior of the incineration shell into two mutually independent front and rear openings, the incineration chamber and the burial chamber being half-closed downwards, The stubble destroying assembly is located in the burning chamber, and the tilling and burying assembly is located in the tilling and burying chamber; The smoke treatment unit is connected to the incineration chamber and the burial chamber respectively through a negative pressure fan.

[0024] The present invention divides the interior of a semi-enclosed incineration shell into two relatively small semi-enclosed spaces by a partition device, which is firstly more conducive to the establishment of a negative pressure environment and convenient for the centralized treatment of flue gas and dust; secondly, since the suitable temperature of crop pests and diseases and their pathogens, insect eggs and grass seeds is mostly 20-30°C, high temperature inhibition will occur at about 40°C, and they will be inactivated in 1-2 minutes at about 100°C. The higher the ambient temperature, the shorter the inactivation time. Therefore, a relatively small incineration chamber is formed, which can play a role in heat preservation and inactivation of pests and diseases and their pathogens, insect eggs and grass seeds attached to the straw and on the surface and shallow soil.

[0025] Preferably, in order to ensure the partition and sealing effect and extinguish the open flame at the same time, the partition device is a retractable rolling sealing roller, and the retractable rolling sealing roller maintains rolling contact with the ground surface. The retractable rolling sealing roller can effectively separate the burning chamber and the tillage chamber to achieve the effect of partition and sealing. The entire burning chamber is approximately in a sealed state, and the burning flame and straw are controllably burned in the burning chamber, which can prevent the flame from spilling out; at the same time, during the movement of the whole machine, the retractable rolling sealing roller automatically performs ground contouring and maintains rolling contact with the ground surface, which can improve the sealing effect, effectively extinguish the open flame, and prevent fire from jumping out.

[0026] Preferably, in order to ensure the partition sealing effect and extinguish the open flame at the same time, the partition device is a flexible fire curtain, and the bottom of the flexible fire curtain is laid on the ground. The flexible fire curtain can be a metal curtain or a fire curtain made of other materials. During the movement of the whole machine, the fire curtain drags on the ground and can adapt to the undulations of the surface to better extinguish the open flame and seal the effect.

[0027] Preferably, in order to effectively form a negative pressure environment to centrally treat the smoke that pollutes the environment and realize the controllable burning of the straw, the incineration shell independently forms an incineration chamber with an opening facing downward and half closed, The tillage and burying assembly includes a tillage and burying chamber which is opened and half-closed downward and a tillage and burying device. The stubble destroying assembly is located in the burning chamber, and the tillage burying device is located in the tillage burying chamber; The smoke treatment unit is connected to the incineration chamber and the burial chamber respectively through pipelines connected to the negative pressure fan.

[0028] The incineration chamber and the tillage chamber are two independent cavities with openings at the front and back and half-closed at the bottom. First, it is more conducive to the establishment of a negative pressure environment and convenient for the centralized treatment of flue gas and dust. Secondly, since the suitable temperature of crop pests and diseases and their pathogens, eggs and grass seeds is mostly 20-30°C, high temperature inhibition will occur at around 40°C, and they will be inactivated in 1-2 minutes at around 100°C. The higher the ambient temperature, the shorter the inactivation time. Therefore, a relatively small incineration chamber is formed, which can play a role in heat preservation and inactivation of pests and diseases and their pathogens, eggs and grass seeds attached to the straw and on the surface and shallow soil.

[0029] In order to ensure the sealing effect and extinguish the open flame at the same time, the rear sealing device is a retractable rolling sealing roller, which keeps rolling contact with the ground surface. The retractable rolling sealing roller can effectively improve the sealing effect of the burning chamber, and the entire burning chamber is approximately in a sealed state. The burning flame and straw are both controllably burned in the burning chamber, which can prevent the flame from spilling out; at the same time, during the movement of the whole machine, the retractable rolling sealing roller automatically performs ground contouring and keeps rolling contact with the ground surface, which can improve the sealing effect, effectively extinguish the open flame, and prevent the fire from jumping out.

[0030] Preferably, in order to ensure the sealing effect and extinguish the open flame at the same time, the rear sealing device is a flexible fire curtain, and the bottom of the flexible fire curtain is laid on the ground. The flexible fire curtain can be a metal curtain or a fire curtain made of other materials. During the movement of the whole machine, the fire curtain drags on the ground and can adapt to the undulations of the ground to better extinguish the open flame and seal the effect.

[0031] Preferably, in order to improve the crushing effect and burning effect of the straw, the stubble destroying assembly is located in the burning shell body near the front end of the burning shell body, forming an arc structure in which the cavity space gradually expands from front to back; The cavity formed by the front inner wall of the incineration shell body and the front end of the stubble destroying assembly is a straw crushing cavity; The cavity from the start end of cavity expansion to the flame area ejected by the flame nozzle is the spin-cast cavity; The cavity from the flame area ejected by the flame nozzle to the tail of the burning shell is the combustion chamber.

[0032] The straw crushing chamber formed by the front end of the stubble destroying assembly and the front end inner wall of the incineration shell body is a narrow space that gradually closes from bottom to top. The straw can be hammered multiple times when it collides back and forth between the stubble destroying assembly and the incineration shell body, and is squeezed at the top of the closed straw crushing chamber, so that the straw crushing effect is better. The crushed straw passes through the rotary throwing chamber with a diffuse space to form dispersed flocculent straw, which can fully contact with the air, and increases the contact surface between the straw and the flame, thereby improving the incineration effect.

[0033] Preferably, in order to facilitate the full mixing of the ash and unburned straw with the soil, the tillage assembly is a rotary tiller structure that rotates from top to bottom along the forward direction of the whole machine. The industry calls it a counterclockwise rotating rotary tillage device. The ash and unburned straw are mixed and buried into the soil by the counterclockwise rotating rotary tillage device, which can effectively improve the soil structure and facilitate the burial of the unburned straw in the soil, which is conducive to further decomposition in the later stage.

[0034] Preferably, in order to improve the crushing effect of the stubble-chopping device, the stubble-chopping part is a stubble-chopping hammer head hingedly mounted on the circumferential surface of the rotating drive roller. The stubble-chopping hammer head includes a hammer head bent in the longitudinal direction and a connection part hingedly connected to the rotating drive roller. The bending of the hammer head in the longitudinal direction can increase the hammering surface and improve the crushing effect of the straw; the hinged connection between the stubble-chopping hammer head and the rotating drive roller can form a hammering effect to improve the crushing effect of the straw, and at the same time can adapt to the uneven field surface, and also protect the stubble-chopping hammer head, thereby increasing the service life of the whole machine.

[0035] Preferably, in order to improve the inactivation effect of pests and diseases, the incineration assembly includes a ground incineration nozzle, which is installed on the inner side of the incineration chamber shell and behind the stubble-killing assembly, and the ground incineration nozzle faces the ground. Before the ash of the burnt straw and the straw that has not been fully burned fall to the ground, the ground incineration nozzle burns the ground and stubble that are no longer covered by straw to inactivate pathogens, insect eggs and weed seeds on the surface and stubble, which can further improve the inactivation effect of pests and diseases.

[0036] Preferably, in order to improve the burning effect, the incineration shell is provided with a nozzle installation chamber extending to the periphery of the incineration shell at the flame nozzle installation position, and the nozzle installation chamber is sealed and connected to the incineration shell. Under the premise of maintaining the sealing effect of the incineration shell, the distance between the flame nozzle and the straw is stretched to achieve external flame burning, thereby improving the incineration effect.

[0037] Preferably, in order to improve the burning effect, the flame nozzle spray direction is not perpendicular to the straw spinning direction. On the premise of ensuring that all the flocculent straw passes through the burning flame area, the flame nozzle flame spray direction is tilted to increase the flocculent straw burning time, thereby improving the burning effect and reducing energy consumption.

[0038] Preferably, in order to further improve the burning effect, the flame nozzle spray direction is the same as or opposite to the straw rotation direction. When the flame nozzle spray direction is the same as or opposite to the straw rotation direction, the straw burning time is the longest, thereby further improving the burning effect.

[0039] Preferably, in order to achieve the effect of energy saving and consumption reduction, at least two groups of independent flame nozzles are arranged in the incineration shell. In order to reduce the consumption of incineration flame gas and reduce the operation cost, by real-time monitoring of the straw burnout rate, a method of graded incineration and separately controlling the intensity of the incineration flame at each level is adopted to maximize the operation efficiency and reduce the operation cost.

[0040] Preferably, in order to improve the incineration effect, the straw is preheated before the flame incineration, and a fresh air system is provided at the front end of the incineration shell, and the fresh air system includes a fan, a heat exchange device and a fresh air preheating pipe; the fan is connected with the inside of the incineration shell through the fresh air preheating pipe, and the fresh air preheating pipe is non-contactly heat exchanged with the flue gas treatment assembly through the heat exchange device before being connected with the incineration shell.

[0041] Non-contact heat exchange is carried out between the high-temperature flue gas and the fresh air to reduce the flue gas temperature and preheat the fresh air; the preheated fresh air enters the incineration shell through the air outlet and preheats the straw; the fan air inlet is located in front of the power assembly and is supplied by a positive pressure fan to avoid the impact of dust on the fresh air system during the stubble burning process; the fresh air system blows in a large amount of hot air to help combustion and reduce the carbon monoxide content at the same time.

[0042] Preferably, in order to improve the treatment effect of dust in the flue gas, the flue gas treatment assembly includes an ammonia water spraying device. The ammonia water spraying device uses ammonia water spraying to purify pollutants in the flue gas and to perform a demisting treatment on the flue gas. The purified clean flue gas is directly discharged into the atmosphere, which can solve the environmental pollution problem caused by straw burning.

[0043] Preferably, in order to achieve the effect of returning fertilizer to the field and eliminating the risk of fire, the waste liquid discharge port of the ammonia water spraying device is located at the rear end of the tillage and burial assembly. The ammonia water waste liquid is sprayed as liquid fertilizer on the soil that has just been rotary tilled behind the rotary tiller and mixed with unburned straw. The straw needs to consume a lot of nitrogen fertilizer during the composting process. The discharge of ammonia water waste liquid can supplement the required nitrogen fertilizer and reduce the amount of nitrogen fertilizer applied. Therefore, it can have both fertilization and spray fire extinguishing functions to eliminate the risk of fire.

[0044] Beneficial effects: The present invention crushes the stubble on the surface and the straw scattered in the field during the stubble removal process, and buries the incense straw into the soil after multi-stage suspended incineration by the tillage and burial assembly. At the same time, the flue gas in the treatment process is treated by the flue gas treatment assembly, thereby achieving the purpose of efficiently and massively treating surplus straw without polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0046] Figure 1 It is a schematic diagram of the structure of the whole machine of the present invention; Figure 2 This is a schematic diagram of the structure of the tool part after removing the power assembly of the present invention; Figure 3 It is a structural schematic diagram of the stubble removing assembly of the present invention; Figure 4 It is a structural schematic diagram of the incineration assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the incineration shell of the present invention; Figure 6 It is a front view of an embodiment of the integral incineration shell body of the present invention; Figure 7 A top view of the incineration shell of the present invention; Figure 8 It is a structural schematic diagram of a first embodiment of a partition device of the present invention; Fig. 9 It is a structural schematic diagram of a second embodiment of a partition device of the present invention; Fig.10 It is a structural schematic diagram of a first embodiment of a rear sealing device of the present invention; Fig.11 It is a structural schematic diagram of a first embodiment of a rear sealing device of the present invention; Fig.12 It is a schematic diagram of the internal layout of the incineration shell of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Embodiment 1

[0050] like Figure 1 , 2 As shown in Figure 3, a straw rotary throwing, crushing and in-situ burning and returning machine comprises a power assembly 1, a stubble destroying assembly 2, a tillage and burying assembly 3, a frame 4, a burning assembly 5 and a flue gas treatment assembly 6; the power assembly 1 provides power to the stubble destroying assembly 2, the tillage and burying assembly 3, the burning assembly 4 and the flue gas treatment assembly 5 respectively, and the stubble destroying assembly 2 and the tillage and burying assembly 3 are fixedly mounted on the frame 4 from front to back at the same time; The stubble-chopping assembly 2 comprises a rotating driving roller 21 and a stubble-chopping part 22 arranged on the circumferential surface of the rotating driving roller. The rotating driving roller 21 drives the stubble-chopping part 22 to throw the straw from bottom to top along the forward direction of the whole machine. The incineration assembly 5 comprises an incineration shell 51 which is opened and half-closed downward and at least one group of flame nozzles 52. The stubble-chopping assembly 2 is located in the incineration shell 51. The flame nozzles 52 are installed on the inner side of the incineration shell 51. The straw crushed and thrown by the stubble-chopping assembly 2 passes through the flame area sprayed by the flame nozzles 52. The flue gas treatment assembly 6 includes a negative pressure fan 61 for forming a negative pressure environment in the incineration shell 51 and a flue gas treatment unit 62 . The flue gas treatment unit 62 is connected to the inside of the incineration shell 51 through a pipe 63 connected to the negative pressure fan 61 .

[0051] In this embodiment, a tractor is used as the power assembly 1, and the height is adjusted by the tractor three-point suspension. During actual operation, the supporting force of the tillage assembly 3 plus the pulling force of the tractor three-point suspension is balanced with the gravity of the machine.

[0052] The present invention can also adopt a self-propelled power assembly to realize the travel of the whole machine and the output of power.

[0053] In this embodiment, the tillage assembly 3 adopts a rotary tiller structure that rotates from top to bottom along the forward direction of the whole machine, which is called a counterclockwise rotary tillage device in the industry. The counterclockwise rotary tillage device mixes and presses the plant ash and unburned straw into the soil, which can effectively improve the soil structure and facilitate the burial of unburned straw in the soil, which is conducive to further decomposition in the later stage.

[0054] The present invention may also adopt other tillage devices such as a plowing device. In this embodiment, the optimal rotary tillage structure is adopted.

[0055] At present, common stubble destroyers usually rotate clockwise and counterclockwise to prevent smoke and dust from spreading to the front cab. The present invention adopts a counter-rotating stubble destroying assembly 2 to hammer and rotate the stubble and broken straw on the surface and send them in a clockwise counter-rotating hammer, gradually breaking them into flocs; the flocculent straw passes through the incineration assembly 5, is incinerated and suspended in self-ignition, and at the same time, the pathogens, insect eggs and weed seeds attached to the straw are fully incinerated and inactivated; the wood ash and unburned straw fall to the ground and then enter the tillage and burial assembly 3, and are mixed and buried into the soil, and the unburned straw on the surface and shallow soil continues to burn or smolder, and the integration of the stubble destroying assembly 2 and the tillage and burial assembly 3 improves the working efficiency; the negative pressure fan 61 collects the dust generated by stubble destroying and rotary tillage, the smoke generated by incineration, and the smoke generated by the burning or smoldering of unburned straw, and then centrally treats them through the smoke treatment unit 62; the purpose of processing surplus straw in large quantities and efficiently without polluting the environment is achieved.

[0056] The present invention realizes efficient treatment of straw by integrating the stubble destroying assembly 2 and the incineration assembly 5. It is no longer simply piled up and burned. Its main function is to treat the wax layer on the surface of the straw through physical crushing and high temperature of flame, destroy its structure, improve its biodegradability and enzymatic hydrolysis efficiency, and thus increase the composting efficiency after being buried in the soil.

[0057] At the same time, the inactivation of pathogens, insect eggs and weed seeds by the present invention mainly relies on the burning flame rather than the spontaneous combustion of the straw, which has a higher temperature and a faster inactivation speed. Even if the straw is not burned due to excessively high moisture content, it does not affect the inactivation effect of the burning flame on the pests and diseases.

[0058] like Figure 4 and 5As shown, in order to effectively form a negative pressure environment to centrally treat the smoke that pollutes the environment and realize the controllable burning of straw, the burning shell 51 includes a burning shell body 511, a front sealing device 512 installed at the front end of the burning shell body 511, side plates 513 located at both sides of the burning shell body 511, and a rear sealing device 514 installed at the rear end of the burning shell body 511. The front sealing device 512, the rear sealing device 514, and the side plates 513 at both sides of the burning shell body 511 are respectively attached to the ground. A semi-enclosed chamber is formed with an opening facing downward, and the entire burning shell 51 is approximately in a sealed state, which is more conducive to forming a negative pressure environment to centrally treat the smoke that pollutes the environment. At the same time, the burning flame and the straw are both controllably burned in the burning chamber to prevent the flame from overflowing.

[0059] like Figure 5 , 6 As shown in FIG. 7 , in order to prevent the flames from igniting the surrounding straw, the side plates 513 on both sides of the incineration shell body 511 are provided with plowboard structures 515, and the plowboard structures 515 on both sides plow toward both sides along the advancing direction. In the working state, the plowboard structures 515 plow into the soil 1cm-2cm to achieve a better sealing effect; during the movement of the whole machine, the plowing action of the plowboard structures 515 separates the straw on both sides from the incineration shell 51, thereby effectively preventing the flames from igniting the surrounding straw.

[0060] like Figure 6 As shown, in order to improve the operation efficiency and reduce the cost, the stubble destroying assembly 2 and the tillage burying assembly 3 are simultaneously located inside the incineration shell 51. The present invention installs the stubble destroying assembly 2 and the tillage burying assembly 3 simultaneously inside the incineration shell 51 of the integral structure. The stubble and broken straw on the surface are hammered by the stubble destroying assembly 2 and burned by the incineration assembly, and then directly buried and pressed into the soil by the tillage burying assembly 3. The straw crushing, throwing, burning and tillage burying are synchronized, which effectively improves the operation efficiency. The cost of agricultural machinery is also one of the important factors affecting the promotion of equipment. The present invention adopts the structure of the integral incineration shell 51, which makes the structure simpler and the manufacturing cost lower, and can effectively reduce the overall cost.

[0061] like Figure 6 , 8 As shown in Figures 9 and 10, in order to improve the inactivation effect of pests and diseases and to facilitate the collection of smoke, a partition device 53 is provided inside the incineration shell 51. The partition device 53 is arranged along the longitudinal direction to divide the interior of the incineration shell 51 into two mutually independent front and rear openings, the incineration chamber 54 and the burying chamber 31, which are semi-enclosed downwards. The stubble destroying assembly 2 is located in the burning chamber 54, and the tilling and burying assembly 3 is located in the tilling and burying chamber 31; The smoke treatment unit 62 is connected to the incineration chamber 54 and the burial chamber 31 through a pipe 63 connected to the negative pressure fan 61.

[0062] The present invention divides the interior of the semi-enclosed incineration shell 51 into two relatively small semi-enclosed spaces through a partition device 53. Firstly, it is more conducive to the establishment of a negative pressure environment and convenient for the centralized treatment of flue gas and dust. Secondly, since the suitable temperature of crop pests and diseases and their pathogens, eggs and grass seeds is mostly 20-30°C, high temperature inhibition will occur at around 40°C, and they will be inactivated in 1-2 minutes at around 100°C. The higher the ambient temperature, the shorter the inactivation time. Therefore, a relatively small incineration chamber is formed, which can play a role in heat preservation and inactivation of pests and diseases and their pathogens, eggs and grass seeds attached to the straw and on the surface and shallow soil.

[0063] like Fig. 9 As shown, in order to ensure the partition and sealing effect and extinguish the open flame at the same time, the partition device 53 is a retractable rolling sealing roller, which maintains rolling contact with the ground surface. The retractable rolling sealing roller can effectively separate the burning chamber 54 and the tillage chamber 31 to achieve the effect of partition and sealing. The entire burning chamber 54 is approximately in a sealed state, and the burning flame and straw are both controllably burned in the burning chamber, which can prevent the flame from spilling out; at the same time, during the movement of the whole machine, the retractable rolling sealing roller automatically performs ground contouring and maintains rolling contact with the ground surface, which can improve the sealing effect, effectively extinguish the open flame, and prevent the fire from jumping out.

[0064] like Fig.12 As shown, in order to improve the crushing and burning effects of the straw, the stubble destroying assembly 2 is located in the burning shell 51 near the front end of the burning shell body 511, forming an arc structure in which the cavity space gradually expands from the front to the back; The cavity formed by the front inner wall of the incineration shell body 511 and the front end of the stubble destroying assembly 2 is a straw crushing cavity 541; The cavity from the start end of the cavity expansion to the flame area ejected by the flame nozzle 52 is the spin-throwing cavity 542; The cavity from the flame area sprayed by the flame nozzle 52 to the tail of the burning shell 51 is the combustion chamber 543.

[0065] The straw crushing chamber 541 formed by the front end of the stubble destroying assembly 2 and the front end inner wall of the incineration shell body 511 is a narrow space that gradually closes from bottom to top. The straw can be hammered multiple times when it collides back and forth between the stubble destroying assembly 2 and the incineration shell body 511, and is squeezed at the top of the closed straw crushing chamber, so that the straw crushing effect is better. The crushed straw passes through the rotary throwing chamber 542 with a diffuse space to form dispersed flocculent straw, which can fully contact with the air, and increases the contact surface between the straw and the flame, thereby improving the incineration effect.

[0066] like Figure 1As shown, in order to facilitate the full mixing of plant ash and unburned straw with the soil, the tillage assembly 3 is a rotary tiller structure that rotates from top to bottom along the forward direction of the whole machine. In the industry, it is called a counterclockwise rotating rotary tillage device. The plant ash and unburned straw are mixed and buried into the soil by the counterclockwise rotating rotary tillage device, which can effectively improve the soil structure and facilitate the burial of unburned straw in the soil, which is conducive to further decomposition in the later stage.

[0067] like Figure 3 As shown, in order to improve the crushing effect of the stubble-chopping device, the stubble-chopping part 22 is a stubble-chopping hammer head hingedly mounted on the circumferential surface of the rotating driving roller 21. The stubble-chopping hammer head includes a hammer head 221 bent in the longitudinal direction and a connecting part 222 hingedly connected to the rotating driving roller. The bending of the hammer head 221 in the longitudinal direction can increase the hammering surface and improve the crushing effect of the straw; the hinged connection between the stubble-chopping hammer head and the rotating driving roller 21 can form a hammering effect to improve the crushing effect of the straw, and at the same time can adapt to the uneven field surface, and also protect the stubble-chopping hammer head, thereby increasing the service life of the whole machine.

[0068] like Fig.12 As shown, in order to improve the inactivation effect of pests and diseases, the incineration assembly 5 includes a ground incineration nozzle 55, which is installed inside the incineration shell 51 and behind the stubble-killing assembly 2, and the ground incineration nozzle 55 faces the ground. Before the ash of the burnt straw and the straw that has not been fully burned fall to the ground, the ground incineration nozzle 55 burns the ground and stubble that are no longer covered by straw to inactivate the pathogens, insect eggs and weed seeds on the surface and stubble, which can further improve the inactivation effect of pests and diseases.

[0069] In order to improve the burning effect, the flame nozzle 52 is not perpendicular to the straw spinning direction. On the premise of ensuring that all the flocculent straw passes through the burning flame area, the flame nozzle 52 is tilted to increase the burning time of the flocculent straw, thereby improving the burning effect and reducing energy consumption.

[0070] In order to further improve the burning effect, the spray direction of the flame nozzle 52 is the same as or opposite to the straw rotation direction. When the spray direction of the flame nozzle 52 is the same as or opposite to the straw rotation direction, the straw burning time is the longest, thereby further improving the burning effect.

[0071] In order to achieve the effect of energy saving and consumption reduction, at least two groups of independent flame nozzles 52 are arranged in the incineration shell 51. In order to reduce the consumption of incineration flame gas and reduce the operation cost, the straw burnout rate is monitored in real time, and the method of graded incineration and respectively controlling the intensity of the incineration flame at each level is adopted to maximize the operation efficiency and reduce the operation cost.

[0072] like Figure 2 and12 As shown, in order to improve the incineration effect, the straw is preheated before the flame incineration. A fresh air system 7 is provided at the front end of the incineration shell 51. The fresh air system includes a fan 71, a heat exchange device 72 and a fresh air preheating pipe 73; the fan 71 is connected to the inside of the incineration shell 51 through the fresh air preheating pipe 73, and the fresh air preheating pipe 73 is non-contactly heat exchanged with the flue gas treatment assembly 6 through the heat exchange device 72 before being connected to the incineration shell 51.

[0073] Non-contact heat exchange is performed between the high-temperature flue gas and the fresh air to reduce the flue gas temperature and preheat the fresh air; the preheated fresh air enters the incineration shell 51 through the air outlet and preheats the straw; the air inlet of the fan 71 is arranged in front of the power assembly 1, and the air is supplied by a positive pressure fan to avoid the influence of dust on the fresh air system during the stubble killing process; the fresh air system 7 blows in a large amount of hot air to play a combustion-supporting role and at the same time reduce the carbon monoxide content.

[0074] like Figure 2 , 4 As shown in Figures 5 and 6, in order to improve the treatment effect of dust in the flue gas, the flue gas treatment assembly 6 includes an ammonia water spraying device. The ammonia water spraying device uses ammonia water spraying to purify pollutants in the flue gas and perform demisting treatment on the flue gas. The purified clean flue gas is directly discharged into the atmosphere, which can solve the environmental pollution problem caused by straw burning.

[0075] In order to achieve the effect of returning fertilizer to the field and eliminating the risk of fire, the waste liquid discharge port 64 of the ammonia water spraying device is located at the rear end of the tillage assembly 3. The ammonia water waste liquid is sprayed as liquid fertilizer on the soil that has just been rotary tilled and mixed with unburned straw behind the rotary tiller. The straw needs to consume a lot of nitrogen fertilizer during the decomposition process. The discharge of ammonia water waste liquid can supplement the required nitrogen fertilizer and reduce the amount of nitrogen fertilizer. Therefore, it can have both fertilization and spray fire extinguishing effects to eliminate the risk of fire. Embodiment 2

[0076] like Figure 8 As shown, in order to ensure the partition sealing effect and extinguish the open flame at the same time, the partition device 53 is a flexible fire curtain, and the bottom of the flexible fire curtain is laid on the ground. The flexible fire curtain can be a metal curtain or a fire curtain made of other materials. During the movement of the whole machine, the fire curtain drags on the ground and can adapt to the undulations of the surface to better extinguish the open flame and seal the effect. Embodiment 3

[0077] like Figure 4 and 5As shown, in order to effectively form a negative pressure environment to centrally treat the smoke that pollutes the environment and realize the controllable burning of straw, the burning shell 51 includes a burning shell body 511, a front sealing device 512 installed at the front end of the burning shell body 511, side plates 513 located at both sides of the burning shell body 511, and a rear sealing device 514 installed at the rear end of the burning shell body 511. The front sealing device 512, the rear sealing device 514, and the side plates 513 at both sides of the burning shell body 511 are respectively attached to the ground. A semi-enclosed chamber is formed with an opening facing downward, and the entire burning shell 51 is approximately in a sealed state, which is more conducive to forming a negative pressure environment to centrally treat the smoke that pollutes the environment. At the same time, the burning flame and the straw are both controllably burned in the burning chamber to prevent the flame from overflowing.

[0078] like Fig.10 and 11 As shown, in order to effectively form a negative pressure environment to centrally treat the smoke that pollutes the environment and realize the controllable burning of straw, the incineration shell 51 independently forms a semi-enclosed incineration chamber 54 with an opening facing downward. The tillage and burying assembly 3 includes a tillage and burying chamber 31 which is opened downward and is semi-closed, and a tillage and burying device 32. The stubble destroying assembly 2 is located in the burning chamber 54, and the tillage and burying device 32 is located in the tillage and burying chamber 31; The smoke treatment unit 62 is connected to the incineration chamber 54 and the burial chamber 31 through a pipe 63 connected to the negative pressure fan 61.

[0079] The incineration chamber 54 and the burying chamber 31 are two mutually independent cavities with openings facing downward and half closed at the front and rear, which are firstly more conducive to the establishment of a negative pressure environment and convenient for the centralized treatment of flue gas and dust; secondly, since the suitable temperature of crop pests and diseases and their pathogens, eggs and grass seeds is mostly 20-30°C, high temperature inhibition will occur at around 40°C, and they will be inactivated in 1-2 minutes at around 100°C. The higher the ambient temperature, the shorter the inactivation time. Therefore, a relatively small incineration chamber is formed, which can play a role in heat preservation and inactivation of pests and diseases and their pathogens, eggs and grass seeds attached to the straw and on the surface and shallow soil.

[0080] like Fig.11 As shown, in order to ensure the sealing effect and extinguish the open flame at the same time, the rear sealing device 514 is a retractable rolling sealing roller, which maintains rolling contact with the ground surface. The retractable rolling sealing roller can effectively improve the sealing effect of the burning chamber 54, and the entire burning chamber 54 is approximately in a sealed state. The burning flame and straw are both controllably burned in the burning chamber, which can prevent the flame from spilling out; at the same time, during the movement of the whole machine, the retractable rolling sealing roller automatically performs ground contouring and maintains rolling contact with the ground surface, which can improve the sealing effect, effectively extinguish the open flame, and prevent the fire from jumping out. Embodiment 4

[0081] like Fig.10 As shown, in order to ensure the sealing effect and extinguish the open flame at the same time, the rear sealing device 514 is a flexible fire curtain, and the bottom of the flexible fire curtain is laid on the ground. The flexible fire curtain can be a metal curtain or a fire curtain made of other materials. During the movement of the whole machine, the fire curtain drags on the ground and can adapt to the undulations of the surface to better extinguish the open flame and seal the effect. Embodiment 5

[0082] like Fig.12 As shown, in order to improve the incineration effect, the flame nozzle 52 is installed in the incineration shell 51 in a nozzle installation chamber 56 extending to the periphery of the incineration shell 51, and the nozzle installation chamber 56 is sealed and connected to the incineration shell 51. Under the premise of maintaining the sealing effect of the incineration shell 51, the distance between the flame nozzle and the straw is stretched to achieve external flame incineration, thereby improving the incineration effect.

[0083] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0084] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A straw rotary throwing, crushing and in-situ burning and returning machine, comprising a power assembly (1), a stubble destroying assembly (2), a tillage and burying assembly (3), a frame (4), a burning assembly (5) and a flue gas treatment assembly (6); the power assembly (1) provides power to the stubble destroying assembly (2), the tillage and burying assembly (3), the burning assembly (4) and the flue gas treatment assembly (5), respectively; the stubble destroying assembly (2) and the tillage and burying assembly (3) are respectively and simultaneously fixedly mounted on the frame (4) from front to back; characterized in that: The stubble-removing assembly (2) comprises a rotating driving roller (21) and a stubble-removing portion (22) arranged on the circumferential surface of the rotating driving roller, wherein the rotating driving roller (21) drives the stubble-removing portion (22) to throw the straw from bottom to top along the forward direction of the whole machine; The incineration assembly (5) comprises an incineration shell (51) with an opening that is half-closed downward and at least one group of flame spray heads (52); the stubble-chopping assembly (2) is located in the incineration shell (51); the flame spray heads (52) are installed on the inner side of the incineration shell (51); the straw that is crushed and thrown by the stubble-chopping assembly (2) passes through a flame area sprayed by the flame spray heads (52); The flue gas treatment assembly (6) comprises a negative pressure fan (61) for forming a negative pressure environment in the incineration shell (51) and a flue gas treatment unit (62); the flue gas treatment unit (62) is connected to the interior of the incineration shell (51) via a pipe (63) connected to the negative pressure fan (61).

2. According to claim 1, the straw rotary throwing, crushing and in-situ burning and returning machine is characterized by: The incineration shell (51) comprises an incineration shell body (511), a front closing device (512) installed at the front end of the incineration shell body (511), side panels (513) located at both sides of the incineration shell body (511), and a rear closing device (514) installed at the rear end of the incineration shell body (511), wherein the front closing device (512), the rear closing device (514) and the side panels (513) at both sides of the incineration shell body (511) are respectively in contact with the ground.

3. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 2 is characterized in that: The side plates (513) on both sides of the incinerator shell body (511) are provided with plowboard structures (515), and the plowboard structures (515) on both sides plow toward both sides along the forward direction.

4. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 1 or 2, characterized in that: The stubble destroying assembly (2) and the tilling and burying assembly (3) are simultaneously located inside the incineration housing (51).

5. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 4 is characterized in that: A partition device (53) is provided inside the incineration shell (51), and the partition device (53) is arranged along the longitudinal direction to divide the interior of the incineration shell (51) into two mutually independent front and rear openings, the incineration chamber (54) and the burying chamber (31), each of which is semi-enclosed downward. The stubble destroying assembly (2) is located in the burning chamber (54), and the tilling and burying assembly (3) is located in the tilling and burying chamber (31); The smoke treatment unit (62) is respectively connected to the incineration chamber (54) and the burial chamber (31) through a pipe (63) connected to the negative pressure fan (61).

6. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 5 is characterized in that: The partition device (53) is a retractable rolling sealing roller, and the retractable rolling sealing roller maintains rolling contact with the ground surface.

7. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 5 is characterized by: The partition device (53) is a flexible fire curtain, and the bottom of the flexible fire curtain is laid on the ground.

8. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 2 or 3, characterized in that: The incineration shell (51) independently forms an incineration chamber (54) which is opened downward and semi-enclosed. The tillage and burying assembly (3) comprises a tillage and burying chamber (31) which is opened and half-closed downward and a tillage and burying device (32). The stubble destroying assembly (2) is located in the burning chamber (54), and the tillage burying device (32) is located in the tillage burying chamber (31); The smoke treatment unit (62) is respectively connected to the incineration chamber (54) and the burial chamber (31) through a pipe (63) connected to the negative pressure fan (61).

9. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 8 is characterized in that: The rear sealing device (514) is a retractable rolling sealing roller, and the retractable rolling sealing roller maintains rolling contact with the ground surface.

10. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 8 is characterized in that: The rear sealing device (514) is a flexible fire curtain, the bottom of which is laid on the ground.

11. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 2 is characterized by: The stubble destroying assembly (2) is located inside the incineration shell (51) near the front end of the incineration shell body (511), forming an arc-shaped structure in which the cavity space gradually expands from front to back; The cavity formed by the inner wall of the front end of the incineration shell body (511) and the front end of the stubble destroying assembly (2) is a straw crushing cavity (541); The cavity from the start end of the cavity expansion to the area before the flame ejected by the flame nozzle (52) is the spin-jet cavity (542); The cavity from the flame area sprayed by the flame nozzle (52) to the tail of the burning shell (51) is the combustion chamber (543).

12. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 1 is characterized in that: The tillage assembly (3) is a rotary tiller structure that rotates from top to bottom to till and bury the soil along the forward direction of the entire machine.

13. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 1 is characterized in that: The stubble destroying part (22) is a stubble destroying hammer head hingedly mounted on the circumferential surface of the rotating driving roller (21).

14. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 1 is characterized in that: The incineration assembly (5) comprises a ground incineration nozzle (55), wherein the ground incineration nozzle (55) is installed inside the incineration housing (51) and is located behind the stubble destroying assembly (2), and the ground incineration nozzle (55) faces the ground.

15. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 1 is characterized in that: The incineration shell (51) is provided with a flame nozzle (52) installed in a nozzle installation chamber (56) extending toward the periphery of the incineration shell (51), and the nozzle installation chamber (56) is sealed and connected to the incineration shell (51).

16. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 1 or 15, characterized in that: The spraying direction of the flame nozzle (52) is arranged non-perpendicularly to the straw spinning direction.

17. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 16 is characterized in that: The spraying direction of the flame nozzle (52) is the same as or opposite to the straw spinning direction.

18. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 17 is characterized in that: At least two groups of mutually independent flame spray heads (52) are arranged in the incineration shell (51).

19. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 1 is characterized in that: A fresh air system (7) is provided at the front end of the incineration shell (51), and the fresh air system comprises a fan (71), a heat exchange device (72), and a fresh air preheating pipe (73); the fan (71) is connected to the interior of the incineration shell (51) through the fresh air preheating pipe (73); and before the fresh air preheating pipe (73) is connected to the incineration shell (51), it passes through the heat exchange device (72) and performs non-contact heat exchange with the flue gas treatment assembly (6).

20. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 1 is characterized in that: The flue gas treatment assembly (6) comprises an ammonia water spraying device.

21. The straw rotary throwing, crushing and in-situ burning and returning machine according to claim 20 is characterized in that: The waste liquid discharge port (64) of the ammonia water spraying device is located at the rear end of the tillage and burial assembly (3).

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