Device for simulating influence of underground water level and rainfall on salt elimination effect of saline-alkali soil concealed conduit

Abstract

The invention relates to a device for simulating the influence of underground water level and rainfall on the salt elimination effect of a saline-alkali soil concealed conduit, and belongs to the technical field of saline-alkali soil experiments. The device comprises a box body, the box body is communicated with the concealed conduit, a drainage pipe and a water inlet pipe, the concealed conduit is laid in the box body, one end of the concealed conduit is communicated with the outside of the box body, and the communicating position of the water inlet pipe and the inside of the box body is located below the concealed conduit; the communicating part of the drainage pipe and the box body is positioned below the water inlet pipe; a rainfall simulation mechanism is arranged on the box body, the rainfall simulation mechanism comprises a transverse pipe, a plurality of vertical pipes and an adjusting assembly, the transverse pipe is erected at the top of the box body and stretches across the box body, one end of each vertical pipe is communicated with the transverse pipe, and the adjacent vertical pipes are arranged at intervals in the length direction of the transverse pipe; the adjusting assemblies are used for changing the water outlet postures of the ends, away from the transverse pipe, of the vertical pipes, the multiple adjusting assemblies are arranged and correspond to the vertical pipes in number, and the application has the effects that the influence data of the underground water level of the saline-alkali soil and rainfall on saline-alkali soil concealed conduit salt elimination can be conveniently obtained, and the migration law of local water and salt is summarized.

Description

Technical Field

[0001] The present application relates to the technical field of saline-alkali soil experiments, and in particular to a device for simulating the influence of groundwater level and rainfall on the salt discharge effect of saline-alkali soil concealed pipes. Background Art

[0002] In the current research on saline-alkali land management, groundwater level and rainfall have a significant impact on salt discharge from underground pipes in saline-alkali land.

[0003] From the perspective of groundwater level, its fluctuation plays a core role in salt drainage from underground pipes. When the groundwater level is high, the moisture content in the soil pores increases, and salt is more likely to rise to the soil surface with water. For example, in some coastal saline-alkali lands or low-lying areas, the groundwater level is close to or higher than the surface, and a large amount of salt accumulates under the action of evaporation, seriously hindering plant growth. At this time, the underground pipe salt drainage system needs to cope with the huge pressure brought by the high water level. If the underground pipe is laid at an unreasonable depth or the drainage capacity is insufficient, the salt cannot be effectively discharged, which will lead to increased soil salinization. When the groundwater level is too low, although the accumulation of salt on the soil surface may be relatively reduced, it may affect the water flow dynamics around the underground pipe, reduce the salt drainage efficiency, and may even lead to excessive loss of soil moisture, affecting the soil ecological environment and the water supply required for vegetation growth.

[0004] Rainfall also has many effects on salt drainage from underground pipes in saline-alkali land. Appropriate rainfall can dilute the salt on the soil surface. Some of the salt will penetrate into the deep soil layer with rainwater and migrate to the vicinity of the underground pipes, which will help enhance the salt drainage effect. However, changes in rainfall intensity and frequency will bring different results. In the case of heavy rain, a large amount of rainwater will flow into the soil in a short period of time, which may exceed the drainage capacity of the underground pipes, causing local water accumulation, destroying the soil structure, and affecting the stability of salt drainage. Moreover, if the drainage is not smooth, the accumulated water will evaporate and cause the salt to re-accumulate on the soil surface. In arid areas, rainfall is scarce, soil moisture is insufficiently replenished, and salt is difficult to move to the underground pipes through leaching, which limits the salt drainage function of the underground pipes and continues to worsen the problem of soil salinization.

[0005] In field tests, changes in groundwater levels and rainfall in natural environments are difficult to accurately control and monitor, resulting in difficulty in summarizing the local water and salt migration patterns. Summary of the invention

[0006] In order to obtain data on the impact of groundwater level and rainfall on salt drainage from saline-alkali soil and summarize the local water-salt migration law, this application provides a device for simulating the impact of groundwater level and rainfall on salt drainage from saline-alkali soil.

[0007] The device provided in this application for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes adopts the following technical scheme: A device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes comprises a box body with an opening at the top, the box body is connected with concealed pipes, drainage pipes and water inlet pipes, the concealed pipes are laid in the box body and one end is connected to the outside of the box body, the connection point between the water inlet pipe and the inside of the box body is located below the concealed pipe, and the connection point between the drainage pipe and the box body is located below the water inlet pipe; a rainfall simulation mechanism is arranged on the box body, the rainfall simulation mechanism comprises a horizontal pipe, a vertical pipe and an adjustment component, the horizontal pipe is erected on the top of the box body and spans the box body, a plurality of vertical pipes are arranged, one end of the vertical pipe is connected to the horizontal pipe, and adjacent vertical pipes are arranged at intervals along the length direction of the horizontal pipe; the adjustment component is used to change the water outlet posture of the vertical pipe away from one end of the horizontal pipe, and a plurality of adjustment components are arranged and are set corresponding to the number of vertical pipes.

[0008] By adopting the above technical solution, local saline-alkali soil is placed in the box, so as to conduct relevant experiments on the local saline-alkali soil. Fresh water / (slightly) salty water or drainage is transported into the box through the water inlet pipe and the drainage pipe to simulate the change of groundwater level. Fresh water is transported into the horizontal pipe, and fresh water is poured from the top of the box through the vertical pipe and the regulating component to simulate rainfall. The hidden pipe is used to drain the water salt. The operator uses the detection instrument to detect and monitor the influence of the groundwater level and rainfall on the salt drainage effect of the hidden pipe of saline-alkali soil, and obtains relevant data, which is convenient for summarizing the local water and salt migration law.

[0009] Optionally, the adjustment assembly includes a positioning ring and a turntable, the positioning ring sleeve is installed on the outer wall of the vertical tube, the turntable is rotatably connected to the positioning ring, the rotation axis of the turntable is arranged in the vertical direction, and the side wall of the turntable is in sliding contact with the end face of the vertical tube away from the horizontal tube; the turntable is provided with an atomization hole and a plurality of water-permeable holes, the line connecting the atomization hole and the center points of all the water-permeable holes is circular and the center of the circle is located on the rotation axis of the turntable, the radius length of the circle is the same as the distance from the rotation axis of the turntable to the center line of the vertical tube, adjacent water-permeable holes are arranged at intervals, the atomization hole is located between any adjacent water-permeable holes, the diameters of adjacent water-permeable holes gradually decrease, and the maximum diameter of the water-permeable holes is the same as the inner diameter of the vertical tube.

[0010] By adopting the above technical solution, since the side wall of the turntable is in sliding contact with the end face of the vertical tube away from the horizontal tube, fresh water can flow out of the vertical tube only when the atomization hole or a water-permeable hole is rotated to the end of the vertical tube. The positions of the water-permeable holes or atomization holes of different diameters can be controlled by rotation, thereby adjusting the spraying water posture, thereby simulating rain of different intensities or simulating drizzle through atomization.

[0011] Optionally, a shower baffle is provided on the positioning ring, and the shower baffle is suspended on a side of the turntable away from the vertical pipe, and the center point of the shower baffle is located on the vertical center line of the vertical pipe.

[0012] By adopting the above technical solution, the water outlet from the vertical pipe impacts the shower baffle, and the shower baffle plays a role of blocking and draining, thereby expanding the spraying area.

[0013] Optionally, a first motor and a belt are provided on the box body, and the first motor is fixed on the box body to drive the belt to rotate. The belt is in a tensioned state, and a plurality of driving columns are fixed on the side wall of the belt facing the turntable, and adjacent driving columns are spaced apart along the length direction of the belt; a special-shaped gear ring is fixed on the circumferential side wall of the turntable in a ring sleeve, and some driving columns close to the special-shaped gear ring are meshed with the special-shaped gear ring.

[0014] By adopting the above technical solution, when the turntable needs to be rotated, the first motor is started, the first motor drives the belt to move, and the driving column on the belt drives the special-shaped gear ring to rotate, thereby realizing the synchronous rotation of multiple turntables.

[0015] Optionally, a fixed rod and a rotating rod are arranged between the shower baffle and the positioning ring, one end of the fixed rod is fixedly connected to the positioning ring, and the other end is rotatably connected to one end of the rotating rod, the rotating rod is fixedly connected to the shower baffle at one end away from the fixed rod, and the rotating rod is arranged in a vertical direction relative to the rotating axis of the fixed rod; a cage-type gear is fixed to the ring sleeve on the rotating rod, and an arc-shaped rack is fixed at the edge of the side wall of the turntable away from the vertical tube, and the arc-shaped rack is used to mesh with the cage-type gear; along the rotation direction of the turntable, the arc-shaped rack is located in front of the atomization hole; a coil spring for resetting the rotating rod is arranged between the fixed rod and the rotating rod.

[0016] By adopting the above technical solution, fresh water impacts the shower baffle through water-permeable holes of different diameters, thereby achieving the effect of expanding the spray area. When the atomization hole is directly opposite to the water outlet end of the vertical pipe, the fresh water is atomized through the atomization hole. At this time, the shower baffle needs to be moved away from directly below the atomization hole to reduce the obstruction of the space below the atomization hole and ensure the atomization area. As the turntable rotates, when the atomization hole is about to face the water outlet end of the vertical pipe, the arc-shaped rack first meshes with the cage gear to drive the rotating rod to rotate. At this time, the shower baffle begins to move away from below the water outlet end of the vertical pipe.

[0017] Optionally, a tilling assembly is provided on the box body, and the tilling assembly includes a second motor, a screw, a slider and a steel fork. The second motor is fixed on the box body and the output end is fixedly connected to one end of the screw. The screw is rotatably arranged on the box body and is arranged across the box body in the length direction. The slider is slidably arranged on the box body and the sliding direction is along the length direction of the screw. The screw penetrates the slider and is threadedly connected to the slider. The steel fork is slidably arranged on the slider in the vertical direction, and the tip of the steel fork itself is arranged downward.

[0018] By adopting the above technical scheme, the rainfall simulation mechanism can not only simulate rainfall, but also add salt to the experimental soil. The prepared solution is sprayed onto the soil through the rainfall simulation mechanism, so as to regulate the degree of soil waterlogging. If the concentration of the sprayed salt solution is high and the salt is expected to quickly penetrate into the soil layer to a certain depth, the second motor is started at this time. The second motor drives the steel fork to move in the box through the screw and the slider. The tip of the steel fork is embedded in the soil, thereby achieving the effect of tilling the land, mixing the surface soil with the lower soil, and promoting the diffusion of salt in the soil pores.

[0019] Optionally, a U-shaped tube is connected to the vertical side wall of the box body, and the opening of the U-shaped tube is arranged upward.

[0020] By adopting the above technical solution, the groundwater level in the box can be checked through the U-shaped tube.

[0021] Optionally, a sealing gasket is fixed on the end face of the vertical pipe, the side wall of the sealing gasket facing away from the vertical pipe is tightly abutted against the turntable, and the inner diameter of the sealing gasket is the same as the inner diameter of the vertical pipe.

[0022] By adopting the above technical solution, the sealing gasket ensures the sealing between the water outlet end face of the vertical pipe and the turntable.

[0023] Optionally, an annular groove is provided on the outer wall of the vertical tube, the annular groove is provided along the outer wall of the vertical tube, and the positioning ring is embedded in the annular groove.

[0024] By adopting the above technical solution, the annular groove plays a role of vertical limiting the positioning ring. The water in the vertical pipe impacts the turntable, and the turntable and the positioning ring have a tendency to fall. The groove wall of the annular groove plays a supporting role for the limiting ring.

[0025] Optionally, universal wheels are installed at the bottom of the box.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The rainfall simulation agency simulates rainfall and can control the intensity and duration of rainfall to facilitate data collection; 2. The rainfall simulation mechanism can not only simulate rainfall, but also add salt to the experimental soil. The prepared solution is sprayed onto the soil through the rainfall simulation mechanism to adjust the soil waterlogging degree. If the concentration of the sprayed salt solution is high and the salt is expected to quickly penetrate into the soil layer to a certain depth, the second motor is started at this time. The second motor drives the steel fork to move in the box through the screw and the slider. The tip of the steel fork is embedded in the soil, thereby achieving the effect of tilling the land, mixing the surface soil with the lower soil, and promoting the diffusion of salt in the soil pores, so as to achieve the effect of multiple utilization of the simulation box; 3. The setting of water inlet pipe and drainage pipe can simulate the rise and fall of groundwater level by controlling the water inlet or drainage into the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application; Figure 2 It is a partial structural cross-sectional view of the internal structure of the box; Figure 3 It is a schematic diagram showing part of the structure of the rainfall simulation mechanism; Figure 4 This is a partial structural diagram showing the location of the shower baffle.

[0028] In the figure, 1. box body; 11. concealed pipe; 12. water inlet pipe; 13. drain pipe; 14. first motor; 15. belt; 16. driving column; 17. special-shaped gear ring; 18. U-shaped pipe; 2. rainfall simulation mechanism; 21. horizontal pipe; 22. vertical pipe; 221. sealing gasket; 222. ring groove; 23. adjustment component; 231. positioning ring; 232. turntable; 3. water permeable hole; 4. atomization hole; 5. shower baffle; 51. fixing rod; 52. rotating rod; 53. cage gear; 54. arc rack; 55. coil spring; 6. tillage component; 61. second motor; 62. screw; 63. slider; 64. steel fork; 7. universal wheel. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-Figure 4 This application is described in further detail.

[0030] The embodiment of the present application discloses a device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes.

[0031] refer to Figure 1 The device for simulating the influence of groundwater level and rainfall on the salt discharge effect of saline-alkali soil concealed pipes comprises a box 1, which is rectangular and has an open top, and universal wheels 7 are installed at the four corners of the bottom of the box 1. The saline-alkali soil of the experiment site is placed inside the box 1. A rainfall simulation mechanism 2 is provided on the box 1 to simulate the influence of rainfall on the salt discharge effect of the saline-alkali soil concealed pipe 11. The box 1 is connected with a concealed pipe 11, which is used to discharge water salt. The box 1 is also connected with a water inlet pipe 12 and a drainage pipe 13 to simulate the rise and fall of the groundwater level.

[0032] refer to Figure 1 and Figure 2, a concealed pipe 11 is laid in the box body 1, and one end of the concealed pipe 11 passes through the vertical side wall of the box body 1 and is connected to the outside. The connection point between the water inlet pipe 12 and the inside of the box body 1 is located below the concealed pipe 11, and the connection point between the drain pipe 13 and the box body 1 is located below the connection point between the water inlet pipe 12 and the box body 1. A U-shaped pipe 18 is connected to the vertical side wall of the box body 1, and the opening of the U-shaped pipe 18 is set upward. Half of the U-shaped pipe 18 is located inside the box body 1 and the other half is located outside the box body 1. The height of the U-shaped pipe 18 is located between the concealed pipe 11 and the drain pipe 13. The areas where the U-shaped pipe 18, the concealed pipe 11, the water inlet pipe 12 and the drain pipe 13 are located in the box body 1 are all buried by saline-alkali soil. The water inlet pipe 12 transports fresh water / (slightly) salty water into the box body 1, and the drain pipe 13 discharges the (slightly) salty water in the box body 1, thereby simulating the rise and fall of the groundwater level.

[0033] refer to Figure 2 and Figure 3 The rainfall simulation mechanism 2 includes a transverse pipe 21, a vertical pipe 22 and an adjustment assembly 23. In this embodiment, two transverse pipes 21 are provided. The transverse pipes 21 are mounted on the top of the box body 1 and cross the top of the box body 1. The transverse pipes 21 are arranged along the length direction of the box body 1. A plurality of vertical pipes 22 and adjustment assemblies 23 are provided on a single transverse pipe 21, and the number of vertical pipes 22 and adjustment assemblies 23 is the same. The vertical pipe 22 is arranged vertically, and the top of the vertical pipe 22 is connected to the inside of the transverse pipe 21. The adjustment assembly 23 is located at the bottom of the vertical pipe 22 and is used to adjust the water outlet posture at the bottom of the vertical pipe 22. Adjacent vertical pipes 22 on a single transverse pipe 21 are arranged at intervals along the length direction of the transverse pipe 21.

[0034] refer to Figure 3 , an annular groove 222 is provided on the vertical tube 22, and the annular groove 222 is provided along the circumferential outer wall of the vertical tube 22, and the annular groove 222 is located near the bottom end of the vertical tube 22. A sealing gasket 221 is fixed on the end surface of the bottom end of the vertical tube 22, and the inner diameter of the sealing gasket 221 is the same as the inner diameter of the vertical tube 22. The adjustment component 23 includes a positioning ring 231 and a rotating disk 232, and the positioning ring 231 is fixed on the outer wall of the vertical tube 22 in the form of an annular ring sleeve, and the positioning ring 231 is located in the annular groove 222. The rotating disk 232 is in the shape of a disk, and the rotating disk 232 is rotatably connected to the positioning ring 231, and the rotating shaft is arranged in the vertical direction. The rotating disk 232 is arranged horizontally, and the side wall of the top surface of the rotating disk 232 is in sliding contact with the sealing gasket 221.

[0035] refer to Figure 3, a plurality of water-permeable holes 3 and an atomizing hole 4 are provided on the turntable 232, and the line connecting the center points of all the water-permeable holes 3 and one atomizing hole 4 forms a circle with the center of the circle located on the rotation axis of the turntable 232, and adjacent water-permeable holes 3 are arranged at intervals. The atomizing hole 4 is located between any adjacent water-permeable holes 3. The diameters of adjacent water-permeable holes 3 gradually decrease, and the maximum diameter of the water-permeable holes 3 is the same as the inner diameter at the bottom end of the vertical tube 22. The radius length of the circle formed by the center point of the atomizing hole 4 and the line connecting the center points of all the water-permeable holes 3 is the same as the distance from the rotation axis of the turntable 232 to the vertical center line of the vertical tube 22, that is: when the turntable 232 is rotated, any water-permeable hole 3 or atomizing hole 4 rotates to the bottom end of the vertical tube 22.

[0036] refer to Figure 1 , Figure 2 and Figure 3 A first motor 14 and a belt 15 are arranged at the top of the box 1. Two belt 15 wheels are also arranged at the top of the box 1. The first motor 14 is fixed at the top of the box 1. The two belt 15 wheels are rotatably arranged at the top of the box 1, that is, the belt 15 wheels rotate relative to the box 1 and the rotating shaft is arranged in the vertical direction. The belt 15 is looped on the two belt 15 wheels and is in a tensioned state. The rotating end of the first motor 14 is fixed to the center of any one of the belt 15 wheels to drive the belt 15 wheels to rotate, and the belt 15 wheels drive the belt 15 to move. A plurality of driving columns 16 are fixed on the belt 15. Adjacent driving columns 16 are arranged at intervals along the length direction of the belt 15. The driving columns 16 are located on the belt surface of the belt 15 facing the turntable 232. The belt 15 is located between the two transverse tubes 21, and the connecting line of the two belt 15 wheels is arranged along the length direction of the transverse tube 21. A special-shaped gear ring 17 is fixed to the axial side wall of the turntable 232 in a ring sleeve, and the driving column 16 near the special-shaped gear ring 17 is meshed with the special-shaped gear ring 17. That is, when the first motor 14 is started, the belt 15 drives the turntable 232 to rotate through the driving column 16 and the special-shaped gear ring 17.

[0037] refer to Figure 3 and Figure 4, a shower baffle 5 is arranged on the positioning ring 231, a fixed rod 51 and a rotating rod 52 are arranged between the shower baffle 5 and the positioning ring 231, one end of the fixed rod 51 is fixedly connected to the positioning ring 231, and the other end is rotatably connected to one end of the rotating rod 52, the rotating rod 52 is fixedly connected to the shower baffle 5 at one end away from the fixed rod 51, and the rotating rod 52 is arranged in the vertical direction relative to the rotating axis of the fixed rod 51. A cage gear 53 is fixed on the ring sleeve of the rotating rod 52, and an arc-shaped rack 54 is fixed at the edge of the side wall of the rotating disk 232 away from the vertical tube 22. Along the rotation direction of the rotating disk 232, the arc-shaped rack 54 is located in front of the atomization hole 4. A coil spring 55 is arranged between the fixed rod 51 and the rotating rod 52, one end of the coil spring 55 is fixedly connected to the fixed rod 51, and the other end of the coil spring 55 is fixedly connected to the rotating rod 52. When the coil spring 55 is in the natural state, the shower baffle plate 5 is located below the turntable 232 and opposite to the bottom end of the vertical tube 22. As the turntable 232 rotates, the arc-shaped rack 54 meshes with the cage gear 53, and the rotating rod 52 begins to rotate relative to the fixed rod 51. At this time, the coil spring 55 begins to deform, and the shower baffle plate 5 begins to move outward from below the turntable 232. When the atomization hole 4 is opposite to the bottom end of the vertical tube 22, the shower baffle plate 5 is completely removed from below the atomization hole 4. When the atomization hole 4 is removed from the bottom end of the vertical tube 22, the arc-shaped rack 54 is disengaged from the cage gear 53, and the coil spring 55 drives the rotating rod 52 to reset until the shower baffle plate 5 returns to the position below the turntable 232 and opposite to the bottom end of the vertical tube 22.

[0038] refer to Figure 1 and Figure 2 The box body 1 is provided with a tillage assembly 6, which includes a second motor 61, a screw 62, a slider 63 and a steel fork 64. The second motor 61 is fixed on the box body 1 and the output end is fixedly connected to one end of the screw 62. The screw 62 is rotatably arranged on the box body 1 and the length direction is arranged across the box body 1 along the length direction of the box body 1. The slider 63 is slidably arranged on the box body 1 and the sliding direction is along the length direction of the screw 62. The screw 62 penetrates the slider 63 and is threadedly connected with the slider 63. The steel fork 64 is slidably arranged on the slider 63 along the vertical direction. The tip of the steel fork 64 itself is arranged downward and inserted into the saline-alkali soil. The slider 63 is provided with a bolt, which penetrates the slider 63 and abuts against the outer wall of the steel fork 64, thereby locking the position of the steel fork 64 and the slider 63.

[0039] The implementation principle of the device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes in the embodiment of the present application is as follows: fresh water / (slightly) salty water or drainage is transported into the interior of the box 1 through the water inlet pipe 12 and the drainage pipe 13 to simulate the change of groundwater level, and fresh water is transported into the horizontal pipe 21, and the fresh water is poured from the top of the box 1 through the vertical pipe 22 and the adjustment component 23 to simulate rainfall, and the turntable 232 is rotated to change the size and shape of the rainfall, and the concealed pipe 11 is used to drain the water salt. The rainfall simulation mechanism 2 can not only simulate rainfall, but also add salt to the experimental soil. The prepared solution is sprayed onto the soil through the rainfall simulation mechanism 2, so as to control the degree of soil waterlogging. If the concentration of the sprayed salt solution is high and the salt is expected to quickly penetrate into the soil layer to a certain depth, the second motor 61 is started at this time. The second motor 61 drives the steel fork 64 to move in the box 1 through the screw 62 and the slider 63. The tip of the steel fork 64 is embedded in the soil, thereby achieving the effect of tilling the land, mixing the surface soil with the lower soil, and promoting the diffusion of salt in the soil pores.

[0040] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes, comprising a box (1), the top of the box (1) is open, and the characteristics are: The box (1) is connected with a concealed pipe (11), a drainage pipe (13) and a water inlet pipe (12); the concealed pipe (11) is laid inside the box (1) and one end of the concealed pipe is connected to the outside of the box (1); the connection point between the water inlet pipe (12) and the inside of the box (1) is located below the concealed pipe (11); the connection point between the drainage pipe (13) and the box (1) is located below the water inlet pipe (12); the box (1) is provided with a rainfall simulation mechanism (2), which comprises a horizontal pipe (21), a vertical pipe (22) and a horizontal pipe (23); The invention relates to a water discharge device comprising a pipe (22) and an adjusting component (23), wherein the transverse pipe (21) is mounted on the top of the box body (1) and crosses the box body (1), a plurality of vertical pipes (22) are provided, one end of the vertical pipe (22) is connected to the transverse pipe (21), and adjacent vertical pipes (22) are arranged at intervals along the length direction of the transverse pipe (21); the adjusting component (23) is used to change the water discharge posture of the vertical pipe (22) away from one end of the transverse pipe (21), and a plurality of the adjusting components (23) are provided and are arranged in a number corresponding to the number of the vertical pipes (22).

2. The device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 1 is characterized in that: The adjustment assembly (23) comprises a positioning ring (231) and a rotating disk (232); the positioning ring (231) is sleeve-mounted on the outer wall of the vertical tube (22); the rotating disk (232) is rotatably connected to the positioning ring (231); the rotating axis of the rotating disk (232) is arranged in the vertical direction; the side wall of the rotating disk (232) is in sliding contact with the end surface of the vertical tube (22) away from the horizontal tube (21); the rotating disk (232) is provided with an atomizing hole (4) and a plurality of water permeable holes ( 3), the line connecting the atomizing hole (4) and the center points of all the water-permeable holes (3) is a circle with the center of the circle located on the rotation axis of the rotating disk (232), the radius of the circle is the same as the distance from the rotation axis of the rotating disk (232) to the center line of the vertical tube (22), adjacent water-permeable holes (3) are arranged at intervals, the atomizing hole (4) is located between any adjacent water-permeable holes (3), the diameters of adjacent water-permeable holes (3) gradually decrease, and the maximum diameter of the water-permeable hole (3) is the same as the inner diameter of the vertical tube (22).

3. The device for simulating the influence of underground water level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 2 is characterized in that: The positioning ring (231) is provided with a shower baffle (5), which is suspended on a side of the rotating disk (232) away from the vertical pipe (22), and the center point of the shower baffle (5) is located on the vertical center line of the vertical pipe (22).

4. The device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 2, characterized in that: The housing (1) is provided with a first motor (14) and a belt (15). The first motor (14) is fixed on the housing (1) and is used to drive the belt (15) to rotate. The belt (15) is in a tensioned state. A plurality of driving columns (16) are fixed on the side wall of the belt (15) facing the rotating disk (232). Adjacent driving columns (16) are arranged at intervals along the length direction of the belt (15). A special-shaped gear ring (17) is fixed in a ring sleeve on the circumferential side wall of the rotating disk (232). Parts of the driving columns (16) close to the special-shaped gear ring (17) are meshed with the special-shaped gear ring (17).

5. The device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 3 is characterized by: A fixed rod (51) and a rotating rod (52) are provided between the shower baffle plate (5) and the positioning ring (231); one end of the fixed rod (51) is fixedly connected to the positioning ring (231), and the other end is rotatably connected to one end of the rotating rod (52); one end of the rotating rod (52) away from the fixed rod (51) is fixedly connected to the shower baffle plate (5); the rotating rod (52) is arranged in a vertical direction relative to the rotation axis of the fixed rod (51); a cage gear (53) is fixedly sleeved on the rotating rod (52); an arc-shaped rack (54) is fixedly provided at the edge of the side wall of the rotating disk (232) away from the vertical tube (22); the arc-shaped rack (54) is used to mesh with the cage gear (53); along the rotation direction of the rotating disk (232), the arc-shaped rack (54) is located in front of the atomization hole (4); and a coil spring (55) for resetting the rotating rod (52) is provided between the fixed rod (51) and the rotating rod (52).

6. The device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 1, characterized in that: The box body (1) is provided with a tilling assembly (6), which comprises a second motor (61), a screw rod (62), a slider (63) and a steel fork (64). The second motor (61) is fixed on the box body (1) and the output end is fixedly connected to one end of the screw rod (62). The screw rod (62) is rotatably arranged on the box body (1) and is arranged across the box body (1) in the length direction. The slider (63) is slidably arranged on the box body (1) and the sliding direction is along the length direction of the screw rod (62). The screw rod (62) passes through the slider (63) and is threadedly connected to the slider (63). The steel fork (64) is slidably arranged on the slider (63) in the vertical direction, and the tip of the steel fork (64) itself is arranged downward.

7. The device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 1, characterized in that: A U-shaped tube (18) is connected to the vertical side wall of the box body (1), and the opening of the U-shaped tube (18) is arranged upward.

8. The device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 2, characterized in that: A sealing gasket (221) is fixed on the end surface of the vertical tube (22); the side wall of the sealing gasket (221) facing away from the vertical tube (22) is in close contact with the rotating disk (232); and the inner diameter of the sealing gasket (221) is the same as the inner diameter of the vertical tube (22).

9. The device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 2, characterized in that: An annular groove (222) is provided on the outer wall of the vertical tube (22). The annular groove (222) is provided along the outer wall of the vertical tube (22) in a circle, and a positioning ring (231) is embedded in the annular groove (222).

10. The device for simulating the influence of groundwater level and rainfall on the salt drainage effect of saline-alkali soil concealed pipes according to claim 1, characterized in that: Universal wheels (7) are installed at the bottom of the box (1).

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