A saline-alkali land treatment device and a saline-alkali land treatment method

Abstract

The invention discloses a saline-alkali land treatment device and a treatment method thereof, which relate to the field of saline-alkali land treatment. The device comprises an outer barrel body and an inner barrel body arranged in the middle of the outer barrel body, wherein the outer barrel body is provided with an outer barrel hole, and the inner barrel body comprises an inner barrel wall, wherein the inner barrel wall is provided with an inner barrel hole, and film covering seams are provided inside two side surfaces of the inner barrel wall provided with the inner barrel hole; a control component is arranged at the top of the inner barrel body and in the equipment cavity, wherein the control component comprises an upper bracket arranged at the top of the inner barrel body, a fixing seat arranged on the surface of the upper bracket, an upper winding roller arranged on the fixing seat, a lower rotating seat arranged in the equipment cavity, and a lower winding roller arranged on the lower rotating seat; the saline-alkali land treatment device, by arranging the control component, can rotate the winding roller when a water-permeable membrane is blocked by salt due to long-term use, thereby rolling up the blocked water-permeable membrane and replacing the unblocked water-permeable membrane in the original position, thereby increasing the use time of the device and reducing the number of maintenance times.

Description

Technical Field

[0001] The invention relates to saline-alkali land treatment technology, and in particular to a saline-alkali land treatment device and a treatment method thereof. Background Art

[0002] Globally, the area of ​​saline-alkali land is expanding, which has seriously affected agricultural production and the ecological environment. The management of saline-alkali land is not only related to the sustainable use of land resources, but also involves food security and ecological environmental protection. Traditional saline-alkali land management technologies mainly include physical management, chemical management and biological management. Physical management measures include covering with sand and soil, deep plowing, etc. Chemical management measures involve the use of amendments such as phosphogypsum and humic acid, while biological management improves the soil by planting salt-tolerant plants or applying microbial fertilizers.

[0003] The Chinese invention patent with the publication number CN109661867B discloses a combined barrel-type saline-alkali land treatment method and a barrel-type treatment method. The outer barrel is buried deep in the original soil layer of the saline-alkali land. The bottom of the barrel body of the outer barrel is provided with an outer barrel side hole and covered with a salt-permeable membrane. The inner barrel is fixed at the inner center of the outer barrel. The bottom of the barrel body of the inner barrel is provided with an inner barrel side hole and covered with a semi-permeable membrane. The inner barrel is used for vegetation planting. The soil lining between the outer barrel and the inner barrel is filled to support the stability of the inner barrel and transfer water. The soil lining between the inner and outer barrels is regularly cleaned and transferred for treatment. As the number of cleanings increases, the salt around the outer barrel is gradually reduced to completely eliminated. The present invention can move the salt around the outer barrel into the bottom layer of the area between the inner and outer barrels. By regularly cleaning the saline-alkali components of the bottom layer of the area between the inner and outer barrels, the purpose of gradually reducing the saline-alkali components around the outer barrel can be achieved. The ecological restoration and improvement of the saline-alkali land is also carried out by biological methods, and the purpose of completely treating the saline-alkali land is finally achieved.

[0004] However, when the invention is in use, as time goes by, a large amount of salt gathers at the semipermeable membrane of the inner barrel, gradually forming a salt layer on the surface of the semipermeable membrane, blocking the semipermeable membrane and causing a reduction in the amount of water entering the inner barrel. The reduction in water will result in the crops being unable to obtain sufficient water for growth, and the soil moisture in the outer barrel is higher, reducing the ability to absorb moisture around the outer barrel. At this time, the device needs to be dug out and the semipermeable membrane replaced, resulting in a short service life of the device and a high number of maintenance times, which is manpower-consuming. Summary of the invention

[0005] The purpose of the present invention is to provide a saline-alkali land treatment device and a treatment method thereof, so as to solve the problems in the prior art that the device has a short service life and a high maintenance frequency.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a saline-alkali land treatment device, comprising an outer barrel body and an inner barrel body arranged in the middle of the outer barrel body, the outer barrel body is provided with an outer barrel hole, the inner barrel body comprises an inner barrel wall, the inner barrel wall is provided with an inner barrel hole, a partition is provided at the bottom of the inner barrel body, an equipment cavity is left between the partition and the bottom of the inner barrel body, and a coating seam is provided inside the two side surfaces of the inner barrel wall provided with the inner barrel hole, the top end of the coating seam passes through the inner barrel wall, and the bottom end is connected with the equipment cavity, and the width is greater than the width of the inner barrel hole; a control component is provided at the top of the inner barrel body and in the equipment cavity, and the control component comprises an upper bracket arranged at the top of the inner barrel body, a fixed seat arranged on the surface of the upper bracket, an upper winding roller arranged on the fixed seat, a lower rotating seat arranged in the equipment cavity, and a lower winding roller arranged on the lower rotating seat.

[0007] Furthermore, the outer barrel body and the inner barrel body are cubes, and the outer barrel body includes soil-filling cavities arranged on both sides and an installation cavity arranged between the two soil-filling cavities.

[0008] Furthermore, outer barrel holes are opened on both sides of the outer barrel body, the outer barrel holes are communicated with the soil filling cavity, and the outer barrel holes are covered with a salt-permeable membrane.

[0009] Furthermore, the inner barrel body is adapted to the installation cavity, and inner barrel holes are provided on both sides of the inner barrel body, and the inner barrel holes are communicated with the soil filling cavity and the interior of the inner barrel body at the same time.

[0010] Furthermore, the filling cavity is filled with filling soil, a saline-alkali layer is provided on the top of the filling soil, the height of the filling soil completely covers the outer barrel hole and the inner barrel hole, and the inner barrel body is filled with planting soil.

[0011] Furthermore, the sizes of the upper winding roller and the lower winding roller are adapted to the film coating seam, the upper winding roller is wound with a water-permeable film, and the water-permeable film is wound on the lower winding roller through the film coating seam.

[0012] Furthermore, both ends of the upper winding roller are rotatably connected to a fixed seat, a plurality of limiting balls are provided on the opposite surfaces of the fixed seat and the upper winding roller, and grooves corresponding to the limiting balls are provided at both ends of the upper winding roller.

[0013] Furthermore, a driving component is also provided in the equipment cavity, and the driving component includes a mounting plate arranged in the mounting cavity, a vertical frame and a driving motor are arranged on the mounting plate, a driving sprocket is arranged at the output end of the driving motor, a transmission sprocket is arranged at one end of the lower winding roller, the driving sprocket and the transmission sprocket sleeve are provided with a transmission chain, and the driving sprocket and the transmission sprocket are both rotatably connected to the vertical frame.

[0014] Furthermore, arranging parts are provided on both sides of the water-permeable membrane, and the arranging parts include a leveling roller arranged on the upper bracket, a limiting roller arranged in the equipment cavity, a movable scraping roller arranged directly below the limiting roller, and a collection box arranged below the movable scraping roller.

[0015] Compared with the prior art, the saline-alkali land management device provided by the present invention is equipped with a control component. When the water-permeable membrane is blocked by salt due to long-term use, the winding roller can be rotated to roll up the blocked water-permeable membrane and replace the unblocked water-permeable membrane in its original position, thereby increasing the use time of the device and reducing the maintenance times. The water-permeable membrane can be replaced without digging out the device.

[0016] The present invention also provides a method for treating saline-alkali land, comprising the following steps:

[0017] S1. Dig treatment pits at intervals on saline-alkali land;

[0018] S2. Place the outer barrel and the inner barrel in the treatment pit;

[0019] S3. Plant crops in the inner barrel, and the crops absorb moisture from the soil;

[0020] S4. The water in the nearby saline-alkali land drives the salt into the outer barrel, and then the water passes through the permeable membrane into the inner barrel, enriching the salt in the outer barrel;

[0021] S5. Clean the soil in the outer barrel and continue to enrich it to reduce the salinity of the soil outside the barrel.

[0022] Compared with the prior art, the present invention provides a method for treating saline-alkali land, which utilizes the device to absorb moisture and salt in the saline-alkali land, thereby enriching the salt in the barrel, reducing the salt content of the saline-alkali land, and achieving the treatment of the saline-alkali land. At the same time, crops are planted to green the saline-alkali land and improve the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the overall structure of the inner barrel provided by an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the overall cross-sectional structure provided by an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the internal structure provided by an embodiment of the present invention;

[0028] Figure 5 for Figure 3 A magnified image of point A;

[0029] Figure 6 for Figure 4 Enlarged view of point B.

[0030] Description of reference numerals:

[0031] 1. Outer barrel body; 2. Inner barrel body; 3. Film covering parts; 4. Control parts; 5. Driving parts; 6. Arrangement parts; 11. Soil filling cavity; 12. Installation cavity; 13. Outer barrel hole; 14. Salt permeable membrane; 15. Filling soil; 16. Saline-alkali layer; 21. Inner barrel wall; 22. Inner barrel hole; 23. Planting soil; 31. Partition; 32. Equipment cavity; 33. Film covering seam; 34. Water-permeable membrane; 41. Upper bracket; 42. Fixed seat; 43. Limiting ball; 44. Upper winding roller; 45. Lower rotating seat; 46. Lower winding roller; 51. Installation plate; 52. Stand; 53. Driving motor; 54. Driving sprocket; 55. Transmission chain; 56. Transmission sprocket; 57. Fixed threaded hole; 61. Leveling roller; 62. Limiting roller; 63. Movable scraping roller; 64. Aggregate box. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Embodiment 1:

[0034] See also Figure 1-3 A saline-alkali land treatment device includes an outer barrel body 1 and an inner barrel body 2 arranged in the middle of the outer barrel body 1, the outer barrel body 1 is provided with an outer barrel hole 13, the inner barrel body 2 includes an inner barrel wall 21, and the inner barrel wall 21 is provided with an inner barrel hole 22.

[0035] Specifically, the inner barrel hole 22 corresponds to the outer barrel hole 13, the inner barrel body 2 is inserted and fixed in the central position inside the outer barrel body 1, the height of the inner barrel body 2 is greater than the height of the outer barrel body 1, and the inner barrel hole 22 and the outer barrel hole 13 can be provided with mesh holes to prevent debris from entering the barrel, and the outer wall of the inner barrel body 2 fits with the inner wall of the outer barrel body 1.

[0036] The outer barrel body 1 and the inner barrel body 2 are cubes. The outer barrel body 1 includes a filling cavity 11 arranged on both sides, and an installation cavity 12 arranged between the two filling cavities 11. The length of the outer barrel body 1 is greater than or equal to twice the length of the inner barrel body 2. The installation cavity 12 is reserved in the middle position of the outer barrel body 1. Two partitions 31 are provided for positioning the inner barrel body 2. When the inner barrel body 2 is inserted into the outer barrel body 1, the two side surfaces are in contact with the partitions 31, and the front and back surfaces are in contact with the outer barrel body 1. The height of the inner barrel is higher than the height of the outer barrel, so as to prevent ground water from flowing into the inner barrel and saline-alkali components from entering the inner barrel body 2.

[0037] Outer barrel holes 13 are provided on both sides of the outer barrel body 1, and the outer barrel holes 13 are connected to the soil filling cavity 11. The outer barrel holes 13 are covered with a salt-permeable membrane 14. Water and salt in the external soil can enter the soil filling cavity 11 through the salt-permeable membrane 14 through the outer barrel holes 13. The bottom surface of the outer barrel body 1 can also be provided with mesh holes and salt-permeable membranes 14 at the position of the soil filling cavity 11 to improve the water intake efficiency.

[0038] The inner barrel body 2 is adapted to the installation cavity 12. Inner barrel holes 22 are opened on both sides of the inner barrel body 2. A water-permeable membrane 34 is provided at the inner barrel hole 22. The water-permeable membrane 34 and the salt-permeable membrane 14 are both prior arts. The inner barrel hole 22 is connected with the filling cavity 11 and the interior of the inner barrel body 2 at the same time. The direction and size of the inner barrel hole 22 correspond to the outer barrel hole 13, so that the moisture in the soil in the outer barrel body 1 can enter the inner barrel body 2 through the inner barrel hole 22.

[0039] The filling cavity 11 is filled with filling soil 15, and a saline-alkali layer 16 is provided on the top of the filling soil 15. The height of the filling soil 15 completely covers the outer barrel hole 13 and the inner barrel hole 22. The inner barrel body 2 is filled with planting soil 23. The planting soil 23 is salt-free and alkali-free soil, which is used to plant various crops to absorb moisture in the soil. The filling soil 15 is used to enrich the salt that enters the outer barrel body 1 with the water. The enriched salt and the salt separated by water evaporation form the saline-alkali layer 16. The moisture of the filling soil 15 enters the inner barrel body 2 through the inner barrel hole 22 for crop growth.

[0040] Working principle: When in use, dig a hole in the saline-alkali land and bury the device, and fill it with corresponding soil. As the crops grow and absorb moisture in the planting soil 23, moisture will evaporate from the soil surface, and the moisture in the outer barrel body 1 will be gradually absorbed. Due to the water-permeable membrane 34, only moisture enters the inner barrel body 2, and the salt is retained in the filling soil 15 of the outer barrel body 1. Similarly, when the moisture evaporates, the salt will also be retained in the filling soil 15. When the filling soil 15 loses water, it will absorb moisture in the external saline-alkali land, and incidentally absorb the salt in the saline-alkali land into the outer barrel body 1. Therefore, as time goes by, the filling soil 15 in the outer barrel body 1 will gradually enrich the salt of the saline-alkali land and reduce the salt content of the saline-alkali land. It is only necessary to process the filling soil 15 in the outer barrel body 1.

[0041] Embodiment 2:

[0042] See also Figure 3-6 This embodiment provides a technical solution based on the first embodiment: a partition 31 is provided at the bottom of the inner barrel body 2, and an equipment cavity 32 is left between the partition 31 and the bottom surface of the inner barrel body 2, and a coating seam 33 is provided inside the two side surfaces of the inner barrel wall 21 with the inner barrel hole 22, and the top end of the coating seam 33 passes through the inner barrel wall 21, and the bottom end is connected with the equipment cavity 32, and the width is greater than the width of the inner barrel hole 22; a control component 4 is provided at the top of the inner barrel body 2 and in the equipment cavity 32, and the control component 4 includes an upper bracket 41 arranged on the top of the inner barrel body 2, a fixed seat 42 arranged on the surface of the upper bracket 41, an upper winding roller 44 arranged on the fixed seat 42, a lower rotating seat 45 arranged in the equipment cavity 32, and a lower winding roller 46 arranged on the lower rotating seat 45.

[0043] Among them, the barrel wall thickness of the inner barrel body 2 is increased. Compared with the ordinary barrel body, the wall thickness of the inner barrel body 2 needs to be thickened to allow the water-permeable membrane 34 to move up and down in the barrel wall. The partition 31 is arranged at the bottom of the inner barrel body 2, which is used to separate a certain space in the inner barrel body 2 for installing other equipment. The separated space is the installation cavity 12, and a coating seam 33 is opened in the two barrel walls of the inner barrel body 2 where the inner barrel hole 22 is set. The width of the coating seam 33 is smaller than the width of the inner barrel body 2 but larger than the width of the inner barrel hole 22. The thickness of the coating seam 33 is adapted to the water-permeable membrane 34, so that the water-permeable membrane 34 can completely cover the inner barrel hole 22 to prevent water leakage, etc. Parts are reserved on both sides for supporting the coating seam 33 to prevent the inner barrel body 2 from deforming and squeezing the water-permeable membrane 34, resulting in the water-permeable membrane 34 being unable to move. The water-permeable membrane 34 can enter the coating seam 33 from the top of the inner barrel body 2 and pass through the coating seam 33 from the installation cavity 12.

[0044] There are two groups of upper brackets 41, each group is provided with two, and the upper brackets 41 of each group are symmetrically arranged about the coating seam 33 and are located on both sides of the coating seam 33. The fixed seat 42 is fixedly connected to the upper bracket 41, and the two ends of the upper winding roller 44 are rotatably connected to the fixed seat 42. Two groups of lower rotating seats 45 are correspondingly arranged in the equipment cavity 32, and the two ends of the lower winding roller 46 are rotatably connected to the lower rotating seat 45. The size of the upper winding roller 44 is the same as that of the lower winding roller 46, and the sizes of the upper and lower winding rollers 46 are adapted to the water-permeable membrane 34. There are two entire control components 4, which correspond to the two inner barrel holes 22 of the inner barrel body 2 respectively. Only one of the control components 4 is shown in the figure.

[0045] The sizes of the upper winding roller 44 and the lower winding roller 46 are adapted to the film coating seam 33. The upper winding roller 44 is wound with a water-permeable film 34, and the water-permeable film 34 is wound around the lower winding roller 46 through the film coating seam 33. Most of the water-permeable film 34 is wound around the upper winding roller 44, and the other end of the water-permeable film 34 is wound and fixed on the lower winding roller 46. By rotating the lower winding roller 46, the water-permeable film 34 can be pulled out from the upper winding roller 44 and gradually wound around the lower winding roller 46.

[0046] Both ends of the upper winding roller 44 are rotatably connected to the fixed seat 42, and a plurality of limiting balls 43 are provided on the opposite surfaces of the fixed seat 42 and the upper winding roller 44. Grooves corresponding to the limiting balls 43 are provided at both ends of the upper winding roller 44. The limiting balls 43 are made of soft elastic material, and the size and position of the grooves correspond to the limiting balls 43, thereby achieving an interference fit between the upper winding roller 44 and the fixed seat 42, thereby preliminarily fixing the position of the upper winding roller 44 to prevent the water-permeable membrane 34 from naturally falling under the action of gravity, and being able to tighten the water-permeable membrane 34 to prevent wrinkles from leaking out of the gaps.

[0047] Before installation, one end of the water-permeable membrane 34 is connected and wound with the lower winding roller 46, and most of the remaining water-permeable membrane 34 is wound on the upper winding roller 44. With long-term use, the water-permeable membrane 34 at the inner barrel hole 22 blocks a large amount of salt, which will accumulate on the surface of the water-permeable membrane 34, blocking the water passage of the water-permeable membrane 34, resulting in a decrease in the water-passing efficiency of the water-permeable membrane 34. At this time, the water-permeable membrane 34 can be pulled downward by rotating the lower winding roller 46, and the blocked water-permeable membrane 34 is wound on the lower winding roller 46, while the unaffected water-permeable membrane 34 reaches the inner barrel hole 22 and continues to block. At this time, the water permeability efficiency returns to the initial level, so that saline-alkali land management can be carried out for a longer period of time without the need to lift the device to maintain the water-permeable membrane 34.

[0048] Furthermore, a driving member 5 is also provided in the equipment cavity 32, and the driving member 5 includes a mounting plate 51 arranged in the mounting cavity 12, and a vertical frame 52 and a driving motor 53 are provided on the mounting plate 51, and a driving sprocket 54 is provided at the output end of the driving motor 53, and a transmission sprocket 56 is provided at one end of the lower winding roller 46, and the driving sprocket 54 and the driving sprocket 56 are sleeved with a transmission chain 55, and the driving sprocket 54 and the driving sprocket 56 are both rotatably connected to the vertical frame 52.

[0049] Among them, the mounting plate 51 is fixedly connected to the lower barrel wall of the inner barrel body 2, and the driving motor 53 is fixedly installed on the mounting plate 51. The stand 52 is arranged at one end of the mounting plate 51. The mounting plate 51 is also provided with a battery and a controller for powering the driving motor 53 and automatically controlling the driving motor 53. For example, a wireless network module can be installed for remote control, or a timing can be set to automatically start the driving motor 53. The driving motor 53 can also be powered by adding a solar panel to obtain a longer charging-free time. The stand 52 is used to install the driving sprocket 54 and the transmission sprocket 56. The mounting plate 51 and the driving motor 53 are arranged in the center of the equipment cavity 32.

[0050] The driving motor 53 is used to control the rotation of the driving sprocket 54, and the transmission sprocket 56 is connected to the lower winding roller 46. For example, a special-shaped groove is provided at one end of the driving sprocket 56, and a corresponding special-shaped rod is provided at the top of the lower winding roller 46, which is inserted into the driving sprocket 56 to realize transmission. The driving sprocket 56 is connected to the driving sprocket 54 through the driving chain 55, and the two lower winding rollers 46 can be driven to rotate at the same time by the driving motor 53. In this state, the two lower winding rollers 46 rotate in the same direction, so the directions in which the two lower winding rollers 46 wrap around the water-permeable membrane 34 are opposite.

[0051] Arrangements 6 are also provided on both sides of the water-permeable membrane 34 , and the arrangement parts 6 include a leveling roller 61 arranged on the upper bracket 41 , a limiting roller 62 arranged in the equipment cavity 32 , a movable scraping roller 63 arranged directly below the limiting roller 62 , and a collection box 64 arranged below the movable scraping roller 63 .

[0052] Among them, the sorting parts 6 are also provided with two groups, corresponding to the two control parts 4 respectively. The two ends of the leveling roller 61 are rotatably connected to the upper bracket 41. Each group of the sorting parts 6 is provided with two leveling rollers 61. A gap is left between the two leveling rollers 61 for the water-permeable membrane 34 to pass through. The two leveling rollers 61 are symmetrically arranged about the water-permeable membrane 34, and the water-permeable membrane 34 can be clamped in the middle. When the water-permeable membrane 34 is pulled out from the upper winding roller 44, it is leveled by the leveling roller 61 and then enters the coating seam 33.

[0053] The limiting roller 62 is arranged on the side of the lower winding roller 46 close to the inner barrel wall 21, the side of the water-permeable membrane 34 contacting the filling soil 15 is the outer side, and the side contacting the planting soil 23 is the inner side. The limiting roller 62 is located on the inner side of the water-permeable membrane 34, and a movable scraping roller 63 is arranged directly below the limiting roller 62. The movable scraping roller 63 is rotatably connected to the inner barrel body 2, and coil springs are arranged at both ends (not shown in the figure). The movable scraping roller 63 is in the shape of a water droplet and can be decomposed into a cone and a rod body. The rod body is rotatably connected to the inner barrel body 2, and the top of the cone contacts the outer surface of the water-permeable membrane 34. Since the coil spring is arranged, the movable scraping roller 63 will be driven by the coil spring to rotate toward the limiting roller 62, and the cone of the movable scraping roller 63 points to the direction of the inner barrel wall 21, thereby scraping off the salt attached to the surface of the water-permeable membrane 34, and the collection box 64 arranged below the movable scraping roller 63 collects the scraped salt and the like.

[0054] Working principle: When in use, the water-permeable membrane 34 is initially installed on the upper winding roller 44 and the lower winding roller 46, passing through the film covering seam 33 in the middle and covering the inner barrel hole 22. After long-term use, as water continues to pass through the water-permeable membrane 34 into the planting soil 23, the salt is blocked on the outside of the water-permeable membrane 34. The longer the time, the more salt accumulates, thereby blocking the water passage of the water-permeable membrane 34. At this time, the drive motor 53 is started, and the drive motor 53 controls the drive sprocket 54 to rotate. The drive sprocket 54 drives the drive sprocket 56 to rotate through the transmission chain 55, thereby controlling the rotation of the lower winding roller 46. The lower winding roller 46 pulls the water-permeable membrane 34 and winds it around the roller. After a certain number of rotations, the water-permeable membrane 34 at the inner barrel hole 22 is completely replaced by the part that has not been in contact with the filling soil 15, and the blocked water-permeable membrane 34 is rolled up onto the lower winding roller 46;

[0055] During the winding process, the lower winding roller 46 pulls the upper winding roller 44 by pulling the water-permeable membrane 34. Initially, the upper winding roller 44 will not rotate because the limiting ball 43 is stuck in the groove. When the pulling force is greater than the limiting force, the limiting ball 43 is squeezed and deformed. At this time, the upper winding roller 44 starts to rotate. This process is repeated until the lower winding roller 46 stops and the limiting ball 43 is stuck in the groove of the upper winding roller 44 again to complete the limiting.

[0056] In order to further reduce the number of maintenance times, an organizing part 6 is additionally provided. When the lower winding roller 46 winds up the water-permeable membrane 34, the water-permeable membrane 34 will first pass through the limiting roller 62 and the movable scraping roller 63. The movable scraping roller 63 presses the water-permeable membrane 34 against the surface of the limiting roller 62 under the action of the coil spring. At this time, the cone discontinuity of the movable scraping roller 63 acts as a scraper to scrape off the salt and the like on the outer surface of the water-permeable membrane 34, thereby performing a simple cleaning on the water-permeable membrane 34. At this time, the upper winding roller 44 can be manually rotated to reset the water-permeable membrane 34 in the reverse direction. The water-permeable membrane 34 that has been scraped and cleaned can be reused without the need to be disassembled for cleaning or replacement.

[0057] Embodiment three:

[0058] A method for treating saline-alkali land, using the above-mentioned saline-alkali land treatment device, comprises the following steps:

[0059] S1. Dig treatment pits at intervals on saline-alkali land;

[0060] S2. Place the outer barrel 1 and the inner barrel 2 in the treatment pit;

[0061] S3, planting crops in the inner barrel 2, and the crops absorb moisture from the soil;

[0062] S4, the water in the nearby saline-alkali land drives the salt into the outer barrel body 1, and the water then passes through the permeable membrane 34 into the inner barrel body 2, enriching the salt in the outer barrel body 1;

[0063] S5. Clean the soil in the outer barrel 1 and continue to enrich the soil to reduce the salinity of the soil outside the barrel.

[0064] In S1, the size of the treatment pit is determined by the size of the outer barrel body 1, and the size of the outer barrel body 1 and the size of the inner barrel body 2 are determined by the crops planted. The saline-alkali soil excavated from the treatment pit can be directly filled into the outer barrel body 1 as filling soil 15, and the depth of the treatment pit is flush with the height of the outer barrel body 1.

[0065] In S2, the outer barrel 1 may also be provided with structures such as a control member 4 and a driving member 5, so that the outer barrel 1 can also control the movable replacement of the salt permeable membrane 14, thereby reducing the maintenance frequency and increasing the maintenance interval.

[0066] In S3 and S4, the crops planted can be various economic crops to achieve greening of saline-alkali land. When watering the crops, the irrigation water is poured outside the outer barrel hole 13 of the outer barrel body 1. The irrigation water first enters the saline-alkali land, and then enters the outer barrel body 1 and the inner barrel body 2 in sequence. It is not poured directly into the inner barrel body 2. The irrigation water is used to carry the moisture in the saline-alkali land into the filling soil 15;

[0067] As the crops absorb water, a large amount of salt is blocked by the permeable membrane 34 in the filling soil 15. At the same time, due to the evaporation of water, salt will also accumulate in the outer barrel 1 to form a saline-alkali layer 16. The moisture absorbed by the crops in the filling soil 15 will cause the filling soil 15 to be drier than the soil in the saline-alkali land. With the above-mentioned irrigation, the salt in the saline-alkali land can be enriched in the outer barrel 1 along with the water, thereby achieving the absorption of salt in the saline-alkali land. The above only describes certain exemplary embodiments of the present invention by way of illustration. Needless to say, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above-mentioned drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A saline-alkali land treatment device, comprising an outer barrel body (1) and an inner barrel body (2) arranged in the middle of the outer barrel body (1), the outer barrel body (1) being provided with an outer barrel hole (13), the inner barrel body (2) comprising an inner barrel wall (21), the inner barrel wall (21) being provided with an inner barrel hole (22), characterized in that a partition (31) is provided at the bottom of the inner barrel body (2), an equipment cavity (32) is left between the partition (31) and the bottom surface of the inner barrel body (2), and a coating seam (33) is provided inside two side surfaces of the inner barrel wall (21) provided with the inner barrel hole (22), the top end of the coating seam (33) penetrates the inner barrel wall (21), the bottom end is connected with the equipment cavity (32), and the width is greater than the width of the inner barrel hole (22); A control member (4) is provided at the top of the inner barrel (2) and in the equipment cavity (32), the control member (4) comprising an upper bracket (41) disposed at the top of the inner barrel (2), a fixed seat (42) disposed on the surface of the upper bracket (41), an upper winding roller (44) disposed on the fixed seat (42), a lower rotating seat (45) disposed in the equipment cavity (32), and a lower winding roller (46) disposed on the lower rotating seat (45); The outer barrel (1) and the inner barrel (2) are cubical, and the outer barrel (1) comprises soil-filling cavities (11) arranged on both sides, and a mounting cavity (12) arranged between the two soil-filling cavities (11); The outer barrel body (1) has outer barrel holes (13) on both sides thereof, the outer barrel holes (13) being connected to the filling cavity (11), and the outer barrel holes (13) being covered with a salt-permeable membrane (14); The inner barrel body (2) is adapted to fit the mounting cavity (12), and inner barrel holes (22) are provided on both sides of the inner barrel body (2), and the inner barrel holes (22) are connected to the filling cavity (11) and the interior of the inner barrel body (2); The filling cavity (11) is filled with filling soil (15), a saline-alkali layer (16) is provided on the top of the filling soil (15), the height of the filling soil (15) completely covers the outer barrel hole (13) and the inner barrel hole (22), and the inner barrel body (2) is filled with planting soil (23); The sizes of the upper winding roller (44) and the lower winding roller (46) are adapted to the film coating seam (33); the upper winding roller (44) is wound with a water-permeable film (34); the water-permeable film (34) is wound on the lower winding roller (46) through the film coating seam (33); The two ends of the upper winding roller (44) are rotatably connected to the fixed seat (42), a plurality of limiting balls (43) are provided on the surfaces opposite to the fixed seat (42) and the upper winding roller (44), and grooves corresponding to the limiting balls (43) are provided at the two ends of the upper winding roller (44).

2. A saline-alkali land treatment device according to claim 1, characterized in that: A driving member (5) is also provided in the equipment cavity (32), and the driving member (5) comprises a mounting plate (51) arranged in the mounting cavity (12), a stand (52) and a driving motor (53) are provided on the mounting plate (51), a driving sprocket (54) is provided at the output end of the driving motor (53), a transmission sprocket (56) is provided at one end of the lower winding roller (46), a transmission chain (55) is sleeved on the driving sprocket (54) and the transmission sprocket (56), and the driving sprocket (54) and the transmission sprocket (56) are both rotatably connected to the stand (52).

3. A saline-alkali land treatment device according to claim 2, characterized in that: Arrangements (6) are also provided on both sides of the water-permeable membrane (34), and the arrangement (6) includes a leveling roller (61) arranged on the upper bracket (41), a limiting roller (62) arranged in the equipment cavity (32), a movable scraping roller (63) arranged directly below the limiting roller (62), and a collection box (64) arranged below the movable scraping roller (63).

4. A method for treating saline-alkali land, using a saline-alkali land treating device according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Dig treatment pits at intervals on saline-alkali land; S2. Place the outer barrel (1) and the inner barrel (2) in the treatment pit; S3. Planting crops in the inner barrel (2), and the crops absorb moisture from the soil; S4. Water in the nearby saline-alkali land drives the salt into the outer barrel (1), and the water then passes through the permeable membrane (34) into the inner barrel (2), concentrating the salt in the outer barrel (1); S5. Clean the soil in the outer barrel (1) and continue to enrich the soil to reduce the salt content of the soil outside the barrel.

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