Rice oil straw smashing and returning device for rice oil rotation saline-alkali soil improvement

Abstract

The invention relates to the technical field of straw smashing and returning, and discloses a rice-oil straw smashing and returning device for rice-oil rotation cropping saline-alkali soil improvement, which comprises a device main body, a traveling wheel is fixedly mounted at the bottom of the rear part of the device main body, a connecting rod is fixedly connected to the front side of the device main body, and a connecting port is formed in the outer end of the connecting rod. A pretreatment cavity and a cutting cavity are formed in the device body, the pretreatment cavity is located in the middle of the device body, the cutting cavity is located on the rear side of the pretreatment cavity, a communicating groove is formed in the top of the cutting cavity, and a motor is fixedly installed on one side of the device body. Two groups of differential pressure rollers are additionally arranged, so that long straws which are easy to wind blades are preliminarily torn and broken into short straws which are not easy to wind the blades, and subsequent blade crushing is facilitated; straw on the ground is shoveled through the poking rod, the rotation speed of the first driven wheel along with rotation of the first driving wheel is reversely reduced through the resistance for poking the straw to rotate, and the rubbing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of straw crushing and returning to the field, and specifically provides a rice-oil straw crushing and returning to the field device for improving saline-alkali soil in rice-oil rotation. Background Technique

[0002] Through the rotation planting of salt-tolerant rice-oil varieties, the utilization efficiency of saline-alkali land can be improved, the domestic supply capacity of rice and vegetable oil can be increased, the agricultural ecological environment can be improved, and it has a good protective effect on the environment. Planting salt-tolerant rice and rapeseed varieties has the special advantages of "utilizing" and "improving" saline-alkali land. While increasing the domestic supply capacity of rice and vegetable oil, it improves the physical and chemical properties of the soil. After the rice-oil straw is returned to the field, the soil becomes loose, with good air and water permeability, and can also increase soil organic matter and improve microbial activity, which is of great significance for improving saline-alkali soil.

[0003] The existing straw crushing and returning to the field device has a simple structure. For rice straw with high fiber strength and rapeseed straw with low lignification and easy to entangle the blades, there is no corresponding targeted pretreatment structure, resulting in poor crushing effect and high device damage and shutdown rate caused by straw entanglement with the blades; secondly, the existing straw crushing device does not have specific treatment for straw returning to the field in saline-alkali land, and the decomposition period of the crushed straw is long, and the efficiency of improving the soil is low, making it difficult to meet the requirements of existing saline-alkali land rice-oil straw crushing and returning to the field. Summary of the Invention

[0004] Aiming at the deficiencies existing in the use of the existing straw crushing and returning to the field device in the background technique, the present invention provides a rice-oil straw crushing and returning to the field device for improving saline-alkali soil in rice-oil rotation, which has the advantages of high crushing degree, not easy to entangle, and short straw decomposition period, and solves the technical problems proposed in the above background technique.

[0005] The present invention provides the following technical solution: A rice-oil rotation saline-alkali soil improvement device for pulverizing and returning rice and oil straws to the field, including a device main body. At the bottom of the rear of the device main body, traveling wheels are fixedly installed. At the front side of the device main body, a connecting rod is fixedly connected. A connection port is opened at the outer end of the connecting rod. Inside the device main body, there are a pretreatment chamber and a cutting chamber. The pretreatment chamber is located at the middle position of the device main body. The cutting chamber is located at the rear side of the pretreatment chamber, and a communication groove is opened at the top. On one side of the device main body, a motor is fixedly installed. The rotating shaft of the motor extends to the outside of the device main body. At the bottom of the pretreatment chamber, a feeding port is provided. At the bottom of the pretreatment chamber, a first driving wheel and a first driven wheel are fixedly installed. The rotating shaft of the first driving wheel extends to the outside of the device main body, and a low-speed disk is fixedly connected to the end of the rotating shaft. A transmission belt is movably sleeved on the outside of the low-speed disk and is in transmission connection with the motor through the transmission belt. At the upper side of the pretreatment chamber, a second driving wheel and a second driven wheel are fixedly installed. The rotating shaft of the second driving wheel extends to the outside of the device main body, and a high-speed disk is fixedly connected to the end of the rotating shaft. The high-speed disk is in transmission connection with the motor through the transmission belt.

[0006] Preferably, a loosening shovel chamber is further provided inside the device main body. The loosening shovel chamber is located below the front side of the pretreatment chamber, and a communication groove is opened at the bottom. A shoveling shaft is fixedly installed inside the loosening shovel chamber. The front and bottom surfaces of the loosening shovel chamber are evenly provided with extending ports. Shoveling rods are evenly arranged on the surface of the loosening shovel chamber. The shoveling rods extend out from the extending ports to contact the ground. A shoveling gear is fixedly installed at the end of the shoveling shaft. A roller gear is fixedly installed at the end of the first driven wheel. The shoveling gear meshes with the roller gear.

[0007] Preferably, a bacterial agent chamber is further provided inside the device main body. The bacterial agent chamber is located above the front side of the device main body. The bacterial agent chamber is an independent space and is not connected to the pretreatment chamber and the loosening shovel chamber. A bacteria replenishing port is opened at the top of the bacterial agent chamber. A pressure pump is fixedly installed inside the bacterial agent chamber. A high-pressure chamber is opened in the middle of the pretreatment chamber. One end of the high-pressure chamber communicates to the outside of the device main body and is movably connected with a movable communication pipe, which is connected to the pressure pump through the movable communication pipe. Injection ports communicating with the first driven wheel are evenly opened at the bottom of the high-pressure chamber. A connecting rod groove is opened at one side of the injection port and is movably connected with an injection connecting rod through the connecting rod groove. A return spring is fixedly installed at the end of the injection connecting rod. An inclined pressure block extending to the outside of the first driven wheel is fixedly connected to the outside of the injection connecting rod. The opening spacing of the injection ports is the same as the spacing between the shoveling rods and the gaps between the rubbing blocks on the first driven wheel. The tooth ratio of the roller gear and the shoveling gear is 1:1, or the tooth ratio of the roller gear and the shoveling gear is the same as the number of single-group shoveling rods.

[0008] Preferably, the outer peripheral surfaces of the first driving wheel, the first driven wheel, the second driving wheel and the second driven wheel are all provided with rubbing blocks.

[0009] Preferably, the diameter of the high-speed disk is smaller than that of the low-speed disk.

[0010] Preferably, a cutting roller is fixedly installed in the cutting cavity, cutting blades are uniformly arranged on the cutting roller, and a spreading opening is formed at the bottom of the cutting cavity.

[0011] The present invention has the following beneficial effects: 1. By adding two groups of differential pressure rollers, the present invention initially tears and breaks the long straws that are easy to wind around the blades into short straws that are not easy to wind around the blades, so as to facilitate subsequent blade crushing; the ground straws are shoveled by the lever, and the resistance of the lever to rotate the straws is used to reversely reduce the rotation speed of the first driven wheel following the first driving wheel, thereby improving the rubbing efficiency.

[0012] 2. By adding two groups of differential pressure rollers, the present invention squeezes and rubs and damages the incoming straws, and uses the speed difference between the first group of rollers and the second group of rollers to tear and break the long straws between the two groups of rollers, initially tearing and breaking the long straws that are easy to wind around the blades into short straws that are not easy to wind around the blades, so as to facilitate subsequent blade crushing.

[0013] 3. The first driven wheel drives the shovel shaft to rotate, so that the lever shovels and scatters the straws on the front ground for easy inhalation. At the same time, the resistance of the shovel cavity to rotate the straws reversely reduces the rotation speed of the first driven wheel following the first driving wheel, further increasing the speed difference between the first driving wheel and the first driven wheel, thereby improving the effect of differential rubbing and making the damage effect of the straw fiber strength in the pretreatment cavity better.

[0014] 4. By adding a microbial agent cavity, the present invention injects salt-tolerant and decomposable bacteria into the straws and the bottom surface, improves the decomposition efficiency of the straws after returning to the field, reduces the straw decomposition period, and uses the change in the pressure generated when different amounts of straws are squeezed into the gap between the first driving wheel and the first driven wheel to automatically control the spraying frequency of the decomposable bacteria, so as to achieve the effect of adaptively injecting the amount of decomposable bacteria under the change of the straw quantity under different planting densities of rice and rapeseed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic sectional view of the overall structure of the present invention; Figure 3 is a schematic sectional view of the gear structure of the present invention; Figure 4 is a top view of the overall structure of the present invention; Figure 5Schematic cross-sectional view of the bacterial agent chamber structure of the present invention; Figure 6 For the present invention Figure 2 Partial enlarged schematic view of the structure at location A in the present invention.

[0016] In the figure: 1, device main body; 2, traveling wheel; 3, connecting rod; 31, connection port; 4, pretreatment chamber; 40, rubbing block; 41, first driving wheel; 411, low-speed disk; 42, first driven wheel; 421, pressure roller gear; 422, high-pressure chamber; 423, bacterial agent injection port; 424, bacterial agent injection connecting rod; 425, inclined pressure block; 426, return spring; 43, second driving wheel; 431, high-speed disk; 44, second driven wheel; 5, soil-loosening chamber; 51, extension outlet; 52, soil-loosening shovel shaft; 521, soil-loosening shovel gear; 53, lever; 6, bacterial agent chamber; 61, supplementary bacterial agent port; 62, pressure pump; 63, movable communication pipe; 7, cutting chamber; 71, spreading-back port; 72, cutting roller; 73, cutting blade; 8, motor; 81, transmission belt. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1-2, A rice-oil rotation straw crushing and returning device for saline-alkali soil improvement in paddy fields, including a device main body 1. At the bottom of the rear of the device main body 1, traveling wheels 2 are fixedly installed. At the front side of the device main body 1, a connecting rod 3 is fixedly connected. A connection port 31 is opened at the outer end of the connecting rod 3, which is convenient for quickly disassembling and connecting the whole device to a traveling device for use. Inside the device main body 1, a pretreatment chamber 4, a loosening shovel chamber 5, a microbial agent chamber 6, and a cutting chamber 7 are separately provided. The pretreatment chamber 4 is located in the middle position of the device main body 1. The loosening shovel chamber 5 is located below the front side of the pretreatment chamber 4, and a communication groove is opened at the bottom. The cutting chamber 7 is located at the rear side of the pretreatment chamber 4, and a communication groove is opened at the top. The microbial agent chamber 6 is located above the front side of the device main body 1. The microbial agent chamber 6 is an independent space and is not connected to the pretreatment chamber 4 and the loosening shovel chamber 5. On one side of the device main body 1, a motor 8 is fixedly installed. The rotating shaft of the motor 8 extends to the outside of the device main body 1. At the bottom of the pretreatment chamber 4, a feeding port is provided, which is convenient for sucking ground straw into the pretreatment chamber 4. At the bottom of the pretreatment chamber 4, a first driving wheel 41 and a first driven wheel 42 are fixedly installed. The rotating shaft of the first driving wheel 41 extends to the outside of the device main body 1, and a low-speed disc 411 is fixedly connected to the end of the rotating shaft. A transmission belt 81 is movably sleeved on the outside of the low-speed disc 411 and is in transmission connection with the motor 8 through the transmission belt 81. After starting the motor 8, the motor 8 drives the first driving wheel 41 to rotate counterclockwise through the transmission belt 81, sucking the straw lifted from the ground into the gap between the first driving wheel 41 and the first driven wheel 42 for extrusion. As the straw pulled into the gap between the first driving wheel 41 and the first driven wheel 42 increases, the frictional force between the straw and the surface of the first driven wheel 42 drives the first driven wheel 42 to rotate. And the rotation speed of the first driven wheel 42 is lower than the rotation speed of the first driving wheel 41 directly driven by the motor 8. Therefore, a differential speed is formed between the first driving wheel 41 and the first driven wheel 42. Rubbing blocks 40 are provided on the outer peripheral surfaces of the first driving wheel 41 and the first driven wheel 42 to squeeze and rub the sucked straw to break it. At the upper side of the pretreatment chamber 4, a second driving wheel 43 and a second driven wheel 44 are fixedly installed. The rotating shaft of the second driving wheel 43 extends to the outside of the device main body 1, and a high-speed disc 431 is fixedly connected to the end of the rotating shaft. The high-speed disc 431 is in transmission connection with the motor 8 through the transmission belt 81. The diameter of the high-speed disc 431 is smaller than the diameter of the low-speed disc 411, so that the rotation speed of the second driving wheel 43 is higher than the rotation speed of the first driving wheel 41. Rubbing blocks 40 are also provided on the outer peripheral surfaces of the second driving wheel 43 and the second driven wheel 44. The straw after being squeezed and rubbed by the first driving wheel 41 and the first driven wheel 42 is pushed upward to the gap between the second driving wheel 43 and the second driven wheel 44 for secondary extrusion and rubbing. At the same time, the rotation speed of the second driving wheel 43 is higher than that of the first driving wheel 41, so that the long straw is torn and broken by the two groups of pressing shafts, and the long straw that is easy to entangle the blade is initially torn and broken into short straw that is not easy to entangle the blade. Then it is pushed upward and fed into the cutting chamber 7 through the communication groove for blade crushing. After being pretreated in the pretreatment chamber 4, the fiber strength of the straw is reduced and the length is appropriate, making it not easy to entangle the blade.It is beneficial to the subsequent crushing effect.

[0019] See also Figure 3-4 A cutting roller 72 is fixedly installed in the cutting chamber 7, and cutting blades 73 are evenly arranged on the cutting roller 72. A scattering port 71 is provided at the bottom of the cutting chamber 7 to facilitate the even spreading of the crushed straw particles back to the ground. A shovel shaft 52 is fixedly installed in the loosening shovel chamber 5. Extension ports 51 are evenly provided on the front and bottom surfaces of the loosening shovel chamber 5. A shifting rod 53 is evenly provided on the surface of the loosening shovel chamber 5. The shifting rod 53 extends from the extension port 51 to contact the ground. A shovel gear 521 is fixedly installed at the end of the shovel shaft 52. The end of the first driven wheel 42 is fixedly installed on the pressure roller gear 421. The shovel gear 521 is meshed with the pressure roller gear 421, so that when the first driven wheel 42 rotates clockwise, it drives the shovel shaft 52 to rotate counterclockwise, so that the straw on the front ground is scattered and shoveled up, so that it can be rolled up by the first driving wheel 41 and rolled into the pretreatment chamber 4. At the same time, the resistance of the straw rotation caused by the shovel chamber 5 to pull down the speed of the first driven wheel 42 following the first driving wheel 41, further increasing the speed difference between the first driving wheel 41 and the first driven wheel 42, thereby improving the effect of differential rubbing, so that the straw fiber strength destruction effect in the pretreatment chamber 4 is better.

[0020] See also Figure 3, a supplementary bacteria inlet 61 is provided at the top of the bacteria agent chamber 6. A pressure pump 62 is fixedly installed in the bacteria agent chamber 6. A high-pressure chamber 422 is provided in the middle of the pretreatment chamber 4. One end of the high-pressure chamber 422 communicates to the outside of the device main body 1 and is movably connected with a movable communication pipe 63, which is connected to the pressure pump 62 through the movable communication pipe 63. The bottom of the high-pressure chamber 422 is evenly provided with bacteria injection ports 423 communicating with the first driven wheel 42. A connecting rod groove is provided on one side of the bacteria injection port 423, and a bacteria injection connecting rod 424 is movably connected through the connecting rod groove. A return spring 426 is fixedly installed at the end of the bacteria injection connecting rod 424. An inclined pressure block 425 extending to the outside of the first driven wheel 42 is fixedly connected to the outside of the bacteria injection connecting rod 424. The opening spacing of the bacteria injection ports 423 is the same as the spacing between the dial rod 53 and the rubbing block 40 on the first driven wheel 42. The tooth ratio of the pressure roller gear 421 and the shovel gear 521 is 1:1, or the same as the number of a single group of dial rods 53. When the end of the dial rod 53 rotates to the gap of the rubbing block 40 on the first driven wheel 42, the inclined pressure block 425 is pressed to move the bacteria injection connecting rod 424 upward to open the bacteria injection port 423. At this time, the bacteria injection port 423 faces the bottom surface. The salt-tolerant and decomposing bacteria pumped from the bacteria agent chamber 6 to the high-pressure chamber 422 by the pressure pump 62 are sprayed out at high pressure from the bacteria injection port 423. After the dial rod 53 rotates, the inclined pressure block 425 is no longer squeezed. The bacteria injection connecting rod 424 is reset by the pushing of the return spring 426 to close the bacteria injection port 423. Thus, when the first driven wheel 42 is driven to rotate one week by the extrusion and friction of the straw between the first driving wheel 41 and the first driven wheel 42, the decomposing bacteria are sprayed onto the bottom surface, thereby accelerating the decomposition of the straw particles returned to the field and improving the efficiency of soil improvement. At the same time, when there is a large amount of straw in the area, the pressure generated by the extrusion of a large amount of straw into the gap between the first driving wheel 41 and the first driven wheel 42 is relatively large. The first driving wheel 41 drives the first driven wheel 42 to rotate at a higher speed under this large frictional force. At a high rotation speed, the frequency of spraying the salt-tolerant and decomposing bacteria onto the bottom surface when the first driven wheel 42 rotates one week is increased. Thus, the injection amount of the decomposing bacteria is automatically adjusted at the place where there is a large amount of straw, and the injection amount of the decomposing bacteria is adapted to the change in the amount of straw under different planting densities of rice and rapeseed, making it more flexible and convenient to use.

[0021] The working principle of the usage method of the present invention is as follows: In use, the device is connected to the traveling device through the connecting rod 3 and the connection port 31. The salt-tolerant and decomposing bacteria such as Bacillus are injected into the bacteria agent chamber 6 through the bacteria supplement port 61. The motor 8 and the movable communication pipe 63 are started. The decomposing bacteria are pre-injected into the high-pressure chamber 422 through the movable communication pipe 63. The traveling device is started. After the straw at the bottom of the first driving wheel 41 is rolled into the space between the first driving wheel 41 and the first driven wheel 42, while the straw is extruded by the rubbing block 40, the straw is rubbed by using the speed difference between the first driving wheel 41 and the first driven wheel 42. At the same time, the frictional force generated by the extrusion of the straw drives the first driven wheel 42 to rotate at a speed lower than that of the first driving wheel 41, driving the lever 53 to rotate counterclockwise, and lifting the straw lying on the ground in front of the ground, so that it can be better rolled up and sucked into the pretreatment chamber 4 by the first driving wheel 41. At the same time, every time the first driven wheel 42 rotates one week, the inclined pressing block 425 is pressed by the end of the lever 53 once, and the closed bacteria injection port 423 is briefly opened, so that the decomposing bacteria in the high-pressure chamber 422 are sprayed out onto the ground under high pressure and then closed again. Thus, during the process of straw crushing and returning to the field, the salt-tolerant and decomposing bacteria are synchronously injected into the field, accelerating the decomposition of the straw particles returning to the field and improving the efficiency of soil improvement. The straw after being extruded and rubbed by the first driving wheel 41 and the first driven wheel 42 is pushed upward into the space between the second driving wheel 43 and the second driven wheel 44 for secondary extrusion and rubbing. At the same time, the rotation speed of the second driving wheel 43 is higher than that of the first driving wheel 41, so that the long straw is torn and broken by the two groups of pressing shafts, and the long straw that is easy to entangle the blade is initially torn and broken into short straws that are not easy to entangle the blade. Then it is pushed upward and fed into the cutting chamber 7 through the self-connecting groove for blade crushing. After being pretreated in the pretreatment chamber 4, the fiber strength of the straw is reduced and the length is suitable and not easy to entangle the blade, which is more conducive to the subsequent crushing effect. The straw particles crushed at the cutting chamber 7 are discharged to the ground through the self-returning port 71 for returning to the field.

[0022] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0023] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rice-oil rotation straw crushing and returning device for saline-alkali soil improvement in paddy fields, comprising a device main body (1), a traveling wheel (2) is fixedly installed at the bottom behind the device main body (1), a connecting rod (3) is fixedly connected to the front side of the device main body (1), and a connection port (31) is opened at the outer end of the connecting rod (3), characterized in that: The device main body (1) is provided with a pretreatment chamber (4) and a cutting chamber (7). The pretreatment chamber (4) is located at the middle position of the device main body (1). The cutting chamber (7) is located at the rear side of the pretreatment chamber (4), and a communication slot is provided at the top. A motor (8) is fixedly installed on one side of the device main body (1). The rotating shaft of the motor (8) extends to the outside of the device main body (1). A feeding port is provided at the bottom of the pretreatment chamber (4). A first driving wheel (41) and a first driven wheel (42) are fixedly installed at the bottom of the pretreatment chamber (4). The rotating shaft of the first driving wheel (41) extends to the outside of the device main body (1), and a low-speed disk (411) is fixedly connected to the end of the rotating shaft. A transmission belt (81) is movably sleeved on the outside of the low-speed disk (411), and is in transmission connection with the motor (8) through the transmission belt (81). A second driving wheel (43) and a second driven wheel (44) are fixedly installed on the upper side of the pretreatment chamber (4). The rotating shaft of the second driving wheel (43) extends to the outside of the device main body (1), and a high-speed disk (431) is fixedly connected to the end of the rotating shaft. The high-speed disk (431) is in transmission connection with the motor (8) through the transmission belt (81).

2. The rice-oil straw crushing and returning device for saline-alkali soil improvement in rice-oil rotation according to claim 1, characterized in that: The device main body (1) is further provided with a loosening shovel chamber (5). The loosening shovel chamber (5) is located below the front side of the pretreatment chamber (4), and a communication slot is provided at the bottom. A shovel rod (52) is fixedly installed in the loosening shovel chamber (5). The front side and the bottom surface of the loosening shovel chamber (5) are evenly provided with extending outlets (51). Shovel rods (53) are evenly arranged on the surface of the loosening shovel chamber (5). The shovel rods (53) extend out from the extending outlets (51) to contact the ground. A shovel gear (521) is fixedly installed at the end of the shovel rod (52). A roller gear (421) is fixedly installed at the end of the first driven wheel (42). The shovel gear (521) is meshed with the roller gear (421).

3. A rice-oil crop rotation straw crushing and returning device for saline-alkali soil improvement according to claim 1, characterized in that: Inside the device main body (1), there is also a bacterium agent chamber (6). The bacterium agent chamber (6) is located above the front side of the device main body (1). The bacterium agent chamber (6) is an independent space and is not connected to the pretreatment chamber (4) and the soil-loosening chamber (5). At the top of the bacterium agent chamber (6), there is a bacterium supplement port (61). Inside the bacterium agent chamber (6), a pressure pump (62) is fixedly installed. In the middle of the pretreatment chamber (4), there is a high-pressure chamber (422). One end of the high-pressure chamber (422) communicates to the outside of the device main body (1) and is movably connected with a movable connecting pipe (63), which is connected to the pressure pump (62) through the movable connecting pipe (63). At the bottom of the high-pressure chamber (422), injection ports (423) communicating with the first driven wheel (42) are evenly arranged. On one side of the injection port (423), there is a connecting rod groove, and an injection connecting rod (424) is movably connected through the connecting rod groove. At the end of the injection connecting rod (424), a return spring (426) is fixedly installed. On the outside of the injection connecting rod (424), an inclined pressure block (425) extending to the outside of the first driven wheel (42) is fixedly connected. The opening spacing of the injection ports (423) is the same as the spacing between the shift lever (53) and the rubbing block (40) on the first driven wheel (42). The tooth ratio of the pressure roller gear (421) and the soil-loosening shovel gear (521) is 1:1, or the tooth ratio of the pressure roller gear (421) and the soil-loosening shovel gear (521) is the same as the number of single-group shift levers (53).

4. A rice-oil crop rotation straw crushing and returning device for saline-alkali soil improvement according to claim 1, characterized in that: On the outer peripheral surfaces of the first driving wheel (41), the first driven wheel (42), the second driving wheel (43), and the second driven wheel (44), there are rubbing blocks (40).

5. A rice-oil crop rotation straw crushing and returning device for saline-alkali soil improvement according to claim 1, characterized in that: The diameter of the high-speed disk (431) is smaller than the diameter of the low-speed disk (411).

6. The rice-oil straw crushing and returning device for improving saline-alkali soil in rice-oil rotation according to claim 1, characterized in that: Inside the cutting chamber (7), a cutting roller shaft (72) is fixedly installed. On the cutting roller shaft (72), cutting blades (73) are evenly arranged. At the bottom of the cutting chamber (7), there is a spreading port (71).

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