A device for groundwater infiltration and salt and alkali discharge in saline-alkali soil

Abstract

The application relates to a saline-alkali soil underground water infiltration and salt-alkali discharge device, and relates to the technical field of soil treatment and repair devices.The device comprises a support system, a spraying mechanism, a deep well, a shallow well, a control mechanism, a buried pipe, a first electromagnetic valve, a neutralizing agent conveying pipe, a first pressure pump, a neutralizing agent container, a water level measuring mechanism, a pre-buried connecting pipe, a first self-priming pump, a first salinity sensor, a second self-priming pump and a second pressure pump.The device constructs an automatic system for saline-alkali soil treatment, provides a systematic solution for saline-alkali soil treatment, can treat saline-alkali soil layers of different depths layer by layer, the treatment process is controllable, the treatment effect is reliable, can automatically treat saline-alkali soil of a large area, and can save water sources, and the treated underground water can be recycled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil remediation devices, in particular to a saline-alkali soil underground water infiltration and salt-alkali discharge device. BACKGROUND

[0002] Saline-alkali soil is a kind of salt accumulation, which refers to the salt contained in the soil affecting the normal growth of crops. The saline-alkali soil area in China is about 9913 million mu, accounting for about one tenth of the world's saline-alkali soil area. Plants in saline-alkali soil area can hardly survive. Therefore, it is very important to improve and discharge alkali in saline-alkali soil. Improving and discharging alkali in saline-alkali soil can increase the area of cultivated land and improve the production of planted crops.

[0003] The existing improvement method for saline-alkali soil mainly adopts the method of washing salt. Washing salt is to pour water into saline-alkali soil to dissolve the salt in the soil, and to discharge the soluble salt in the surface soil layer to the buried pipe for discharge. This treatment method has the problem that the water source consumption is not easy to control. Once the water consumption is excessive, the water containing salt and alkali components cannot be quickly discharged, which will cause the rapid rise of underground water, resulting in the secondary salinization phenomenon.

[0004] In order to solve this technical problem, the existing documents CN202121040407.9 and CN201921147368.5 both propose a scheme of recycling underground water, which controls the water level of underground water by setting a water storage well, and processes the underground water to promote the recycling of underground water. However, this kind of technology still has the following defects:

[0005] 1. It cannot be used for grading treatment of saline-alkali soil at different depths. The technology is only limited to the treatment of the surface saline-alkali soil.

[0006] 2. It cannot realize automatic control of saline-alkali soil treatment. For a piece of saline-alkali soil that needs to be treated, there is a lack of systematic solution. SUMMARY

[0007] The present application provides a saline-alkali soil underground water infiltration and salt-alkali discharge device, which can solve the problems 1 and 2 in the prior art.

[0008] To achieve the above purpose, the technical scheme of the present application is as follows:

[0009] The utility model provides a kind of saline-alkali soil underground water infiltration and salt-alkali device, including being located on the support system of saline-alkali soil, the spraying mechanism of being set by support system, the deep well in saline-alkali soil below spraying mechanism, shallow well being located in deep well one side and control mechanism, the side wall periphery of deep well is evenly distributed with multiple groups of underground pipe, and multiple groups of underground pipe are laid according to the different soil depth of saline-alkali soil to be managed, each group of underground pipe includes multiple drainage pipes distributed around deep well axis, and first electromagnetic valve is arranged in each drainage pipe;Neutralizing agent delivery pipe is fixedly arranged at the center of deep well along longitudinal direction, the top end of neutralizing agent delivery pipe is connected with neutralizing agent container by first pressure pump, and water level measuring mechanism is further connected on the side wall of deep well;Shallow well is connected with the bottom of deep well by pre-buried connecting pipe, first self-priming pump is arranged on pre-buried connecting pipe, first salinity sensor is further arranged in shallow well, and shallow well is connected with spraying mechanism by second self-priming pump, and spraying mechanism is further connected with clean water source by second pressure pump, the control mechanism is configured to control first electromagnetic valve, first pressure pump, second pressure pump, first self-priming pump and second self-priming pump, and is connected with water level measuring mechanism and first salinity sensor by wire signal;In the treatment of saline-alkali soil, different depths of underground pipe are sequentially opened, different depths of saline-alkali soil are treated layer by layer in depth by the collection of underground water of different depths, the use of neutralizing agent, the recycling of shallow well purification water source and the spraying of spraying system, and the underground pipe corresponding to the upper layer of soil is closed when the next layer of soil is treated.

[0010] Preferably, the second salinity sensor is arranged in the deep well, the water level measuring mechanism includes a grating ruler arranged along the longitudinal direction of the well wall of the deep well, and a guide column fixedly arranged on the inner side of the grating ruler along the longitudinal direction, the bottom end of the guide column is fixedly connected with the bottom of the deep well, a floating plate is slidably sleeved on the guide column, the floating plate is connected with the reading head of the grating ruler, and the second salinity sensor and the grating ruler are respectively connected with the control mechanism by signal.

[0011] Preferably, the neutralizing agent container is arranged on the ground, and a plurality of groups of nozzle assemblies are arranged on the neutralizing agent delivery pipe along the longitudinal direction, each group of nozzle assemblies includes a plurality of high-pressure nozzles uniformly distributed around the axis of the neutralizing agent delivery pipe, and the high-pressure nozzles promote the mixing of the neutralizing agent in the underground water by the impact force of the water flow sprayed out while the neutralizing agent is inputted.

[0012] Preferably, the shallow well top is provided with a cover, a water outlet pipe is longitudinally penetrated in the center of the cover, a second self-priming pump is connected to the top end of the water outlet pipe, the output end of the second self-priming pump is connected with the spraying mechanism through a first connecting pipe; the control mechanism starts the first self-priming pump according to the amount of underground water entering the deep well per unit time, and controls the rotating speed of the first self-priming pump to prevent the underground water from reaching the bottom of the soil at the treatment depth; the control mechanism also starts the second self-priming pump according to the amount of underground water entering the deep well per unit time, and the flow rate of the second self-priming pump is equal to or less than the amount of underground water entering the deep well per unit time, so as to realize the cyclic spraying of the saline-alkali soil.

[0013] Preferably, the first salinity sensor is arranged on the sidewall of the shallow well, when the first salinity sensor detects that the salinity in the shallow well exceeds the standard, the control mechanism stops the second self-priming pump and starts the second pressure pump to spray water, and in this process, the neutralizing agent is input into the shallow well until the underground water in the shallow well meets the salinity standard, then the second pressure pump is closed and the second self-priming pump is restarted.

[0014] Preferably, the device for inputting the neutralizing agent into the shallow well comprises a third pressure pump, the input end of the third pressure pump is connected with the neutralizing agent container, the output end is connected with the shallow well, and the third pressure pump is electrically connected with the control mechanism through wires.

[0015] Preferably, the support system comprises a plurality of support columns inserted into the outer edge of the saline-alkali soil to be treated, and a top frame connected to the top ends of the plurality of support columns.

[0016] Preferably, the spraying mechanism comprises a water supply main pipe fixed to the lower end of the top frame and a plurality of spraying pipes arranged below the top frame, the water supply main pipe and the spraying pipes are communicated through a second connecting pipe, the lower end of each spraying pipe is uniformly provided with a plurality of spray heads, the spraying pipes and the water supply main pipe are fixedly connected with the top frame through connecting pieces, one end of the first connecting pipe is connected with the water supply main pipe, and the output end of the second pressure pump is connected with the other end of the water supply main pipe.

[0017] Preferably, each high-pressure spray head is provided with a second electromagnetic valve, and the control mechanism is electrically connected with the second electromagnetic valve.

[0018] The application discloses a use method of a saline-alkali soil underground water infiltration and saline-alkali soil discharging device.

[0019] The application constructs an automatic system for saline-alkali soil treatment, provides a systematic scheme for saline-alkali soil treatment, can treat saline-alkali soil layers of different depths layer by layer, the treatment process is controllable, the treatment effect is reliable, can automatically treat saline-alkali soil of a large area, and saves water sources. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structural schematic diagram when the application is used;

[0021] 1, saline-alkali soil; 2, shallow well; 3, deep well; 4, neutralizing agent container; 5, support; 6, top frame; 7, water supply main pipe; 8, spraying pipe; 9, spray head; 10, water outlet pipe; 11, second self-priming pump; 12, first connecting pipe; 13, underground water outlet pipe; 14, pre-buried connecting pipe; 15, first pressure pump; 16, neutralizing agent delivery pipe; 17, second pressure pump; 18, high-pressure spray head; 19, drainage pipe; 20, grating ruler; 21, guide column; 22, floating plate. Detailed Implementation

[0022] The following description provides a detailed explanation of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limiting this invention.

[0024] Example 1:

[0025] A groundwater infiltration and desalination device for saline-alkali land, such as Figure 1 As shown, it includes a support system set on saline-alkali land, a spraying mechanism erected through the support system, a deep well 3 located in the saline-alkali land 1 below the spraying mechanism, a shallow well 2 located on one side of the deep well, and a control mechanism; in this invention, the deep well and the shallow well are relative, that is, the shallow well is shallower than the deep well, and the deep well is deeper than the shallow well. At the same time, the depth of the deep well is determined according to the depth of the saline-alkali land to be treated, and it must be at least deeper than the bottom layer depth of the saline-alkali land to be treated.

[0026] like Figure 1 As shown, multiple sets of underground pipes are evenly distributed around the outer perimeter of the sidewall of the deep well 3. These underground pipes are arranged according to the different depths of the saline-alkali soil to be treated. Each set of underground pipes includes multiple drainage pipes 19 distributed around the axis of the deep well. Each drainage pipe 19 is equipped with a first solenoid valve. The structure of the drainage pipes is existing technology and will not be described in detail. Their length is set as needed. By setting multiple sets of underground pipes at different depths, step-by-step treatment of saline-alkali soil at different depths can be carried out. That is, after the first layer of soil is treated, the second layer can be treated, and so on. The location of the drainage pipes is precisely at the bottom of the soil layer to be treated, marking the maximum depth of that soil layer. During the spraying process, groundwater containing saline-alkali components enters the deep well through this set of drainage pipes, realizing the treatment of that layer of saline-alkali soil. Step-by-step treatment of saline-alkali soil layers at different depths enables the controllability of the saline-alkali soil treatment process and allows adjustment of the treatment depth according to the land use nature, ensuring the quality of the treated soil. If irrigation is carried out solely through water sources, it is impossible to control water usage, or whether groundwater will rise rapidly and backflow, and consequently, the depth and quality of soil remediation cannot be controlled.

[0027] like Figure 1As shown, a neutralizing agent delivery pipe 16 is fixed longitudinally at the center of the deep well 3. The top end of the neutralizing agent delivery pipe 16 is connected to the neutralizing agent container 4 through a first pressure pump 15. A water level measuring mechanism is also connected to the side wall of the deep well 3.

[0028] like Figure 1 As shown, the shallow well 2 is connected to the bottom of the deep well via a pre-embedded connecting pipe 14. A first self-priming pump (not shown in the figure) is installed on the pre-embedded connecting pipe. A first salinity sensor (not shown in the figure) is also installed inside the shallow well 2. The shallow well 2 is connected to the spraying mechanism via a second self-priming pump 11. The spraying mechanism is also connected to a purified water source via a second pressure pump 17. The control mechanism is configured to control the first solenoid valve, the first pressure pump, the second pressure pump, the first self-priming pump, and the second self-priming pump, and is connected to the water level measuring mechanism and the first salinity sensor via wires. In the treatment of saline-alkali land, by sequentially opening underground pipes at different depths, the saline-alkali land at different depths is treated layer by layer through the collection of groundwater at different depths, the use of neutralizing agents, the recycling of purified water from the shallow well, and the spraying of the spraying system. When treating the next layer of soil, the underground pipe corresponding to the upper layer of soil is closed. Initially, purified water was introduced through a second pressure pump to spray the saline-alkali land. As the treatment progressed, groundwater could be recycled for spraying, achieving a circular treatment process and thus saving water resources.

[0029] Example 2:

[0030] Based on Example 1, this example is further improved as follows:

[0031] like Figure 1 As shown, a second salinity sensor (not shown) is installed inside the deep well 3. The water level measuring mechanism includes a grating ruler 20 arranged longitudinally along the well wall and a guide post 21 fixed longitudinally inside the grating ruler 20. The bottom end of the guide post 21 is fixedly connected to the bottom of the deep well 3. A float plate 22 is slidably sleeved on the guide post 21. The float plate 22 is connected to the reading head of the grating ruler 20. The second salinity sensor and the grating ruler 20 are respectively connected to the control mechanism. The control mechanism calculates the required amount of neutralizing agent based on the size parameters of the deep well 3, the height of the grating ruler 20 rising per unit time, and the salinity parameters inside the deep well 3, and pumps the required amount of neutralizing agent into the deep well 3 through the first pressure pump 15. By controlling the amount of neutralizing agent pumped, the groundwater in the deep well can be neutralized, and then introduced into a shallow well for irrigation.

[0032] like Figure 1As shown, the neutralizing agent container 4 is located on the ground surface, and multiple sets of nozzle assemblies are distributed longitudinally on the neutralizing agent delivery pipe 16. Each set of nozzle assemblies includes multiple high-pressure nozzles 18 evenly distributed around the axis of the neutralizing agent delivery pipe 16. By relying on the impact force of the sprayed water flow through the high-pressure nozzles 18, the neutralizing agent is promoted to mix evenly in the groundwater while being input.

[0033] Example 3:

[0034] Based on Example 2, this example is further improved as follows:

[0035] like Figure 1 As shown, the shallow well 2 is capped at the top, and a water outlet pipe 10 runs longitudinally through the center of the cap. A second self-priming pump 11 is connected to the top of the water outlet pipe 10. The output end of the second self-priming pump 11 is connected to the spraying mechanism via a first connecting pipe 12. The control mechanism starts the first self-priming pump based on the amount of groundwater entering the deep well 3 per unit time, and controls the speed of the first self-priming pump to prevent the groundwater from exceeding the depth of the underground pipe corresponding to the treated soil depth. The control mechanism also starts the second self-priming pump 11 based on the amount of groundwater entering the deep well per unit time. The flow rate of the second self-priming pump 11 is equal to or less than the amount of groundwater entering the deep well per unit time, so that the saline-alkali soil is circulated and sprayed. The depth of the underground pipe corresponding to the treated soil depth should be understood as follows: for example, if the depth of the first layer of treated soil is 1m, then the corresponding underground pipe is also set at a depth of 1m from the surface; and if the depth of the second layer of treated soil is 2m (i.e., the soil layer between 1m and 2m), then the corresponding underground pipe is set at a depth of 2m from the surface. This embodiment achieves control over circulating spraying, circulating treatment, and progressively deeper treatment.

[0036] Example 4:

[0037] Based on Example 3, this example is further improved as follows:

[0038] like Figure 1 As shown, the first salinity sensor is installed on the side wall of the shallow well 2. When the first salinity sensor detects that the salinity in the shallow well exceeds the standard, the control mechanism stops the second self-priming pump 11 and starts the second pressure pump to spray with clean water. During this process, a neutralizing agent is introduced into the shallow well until the groundwater in the shallow well meets the salinity standard. Then, the second pressure pump is turned off and the second self-priming pump 11 is restarted.

[0039] like Figure 1 As shown, the device for inputting neutralizing agent into the shallow well includes a third pressure pump (not shown in the figure, but its input principle is the same as that of the first pressure pump). The input end of the third pressure pump is connected to the neutralizing agent container 4, and the output end is connected to the shallow well 2. The third pressure pump is electrically connected to the control mechanism through a wire.

[0040] In this embodiment, the first salinity sensor plays a monitoring role, and in fact the second salinity sensor has detected the salinity in the deep well, but it is necessary to further monitor in the shallow well to ensure the effectiveness of the circulation treatment.

[0041] Embodiment 5:

[0042] On the basis of embodiment 4, this embodiment is further improved as follows:

[0043] As shown in Figure 1 , the support system comprises a plurality of support columns 5 inserted at the outer edge of the saline-alkali soil to be treated, and a top frame 6 connected to the top end of the plurality of support columns 5. The top frame 6 is a shelf on which the water supply main pipe and the spray pipe can be hung.

[0044] As shown in Figure 1 , the spray mechanism comprises a water supply main pipe 7 fixed to the lower end of the top frame 6 and a plurality of spray pipes 8 arranged below the top frame 6. The water supply main pipe 7 and the spray pipes 8 are connected through a second connecting pipe (not labeled in the figure). The lower end of each spray pipe 8 is evenly distributed with a plurality of spray heads 9. The spray pipe 8 and the water supply main pipe 7 are fixedly connected to the top frame 6 through connecting pieces. The first connecting pipe 12 is connected to one end of the water supply main pipe 7, and the output end of the second pressure pump is connected to the other end of the water supply main pipe 7.

[0045] As shown in Figure 1 , each high-pressure spray head is provided with a second electromagnetic valve (not shown in the figure), and the control mechanism is electrically connected to the second electromagnetic valve. In use, only the second electromagnetic valve corresponding to the depth of the underground pipe is controlled to be opened, and the neutralizing agent is mixed uniformly by the impact force of the water flow.

[0046] Embodiment 6:

[0047] On the basis of embodiment 5, this embodiment further discloses that:

[0048] A use method of a saline-alkali soil underground water infiltration and salt-alkali discharge device, as shown in Figure 1As shown, comprising the following steps: step 1, the periphery of the saline-alkali soil to be treated is inserted with a support, and the support is fixed; a top frame is erected on the top end of the support, and a water supply main pipe and a spray pipe are connected; a second pressure pump is connected, and the second pressure pump is connected with a clean water source; step 2, a deep well is buried in the saline-alkali soil to be treated, the deep well is provided with a plurality of groups of underground pipes according to different depths of the saline-alkali soil to be treated, each group of underground pipes corresponds to the position of the bottom of a certain depth of soil layer, the deep well is provided with a neutralizing agent delivery pipe, the neutralizing agent delivery pipe is connected with a neutralizing agent container on the ground through the first pressure pump; a shallow well is buried, the shallow well is connected with the deep well through a pre-buried connecting pipe; the shallow well is connected with the spraying mechanism through a second self-priming pump; step 3, the second pressure pump is started, clean water is sprayed, during the spraying process, the topmost group of underground pipes is opened, underground water enters the deep well through the topmost group of underground pipes, the amount of neutralizing agent required to be input into the deep well per unit time is calculated according to the calculation of the water inflow per unit time in the deep well, the salinity parameter of the underground water in the deep well and the size data of the deep well, and the neutralizing agent is input into the deep well through the first pressure pump; the underground water is pumped into the shallow well through the first self-priming pump, for the qualified underground water, it is pumped to the spraying mechanism through the second self-priming pump, at this time, the second pressure pump is stopped; step 4, when the second salinity sensor detects that no neutralizing agent needs to be added in the deep well and the salinity of the underground water is qualified, the soil treatment of the next depth is carried out; at this time, the topmost underground pipe is closed, the underground pipe corresponding to the bottom of the further soil layer to be treated is opened, the underground water enters the deep well through the underground pipe, until the underground water is qualified without adding neutralizing agent, the soil treatment program of the next layer of soil is entered, and the process is repeated until the soil layer of the required depth is completely treated.

Claims

1. A device for groundwater infiltration and desalination in saline-alkali land, characterized in that: The application relates to a saline-alkali soil treatment device, which comprises a support system arranged on a saline-alkali soil, a spraying mechanism arranged on the support system, a deep well arranged in the saline-alkali soil below the spraying mechanism, a shallow well arranged on one side of the deep well and a control mechanism, the side wall of the deep well is uniformly provided with a plurality of groups of buried pipes, the groups of buried pipes are arranged according to the different soil depths of the saline-alkali soil to be treated, each group of buried pipes comprises a plurality of drainage pipes which are distributed around the axis of the deep well, and a first electromagnetic valve is arranged in each drainage pipe; a neutralizing agent conveying pipe is fixedly arranged at the center of the deep well in the longitudinal direction, the top end of the neutralizing agent conveying pipe is connected with a neutralizing agent container through a first pressure pump, and a water level measuring mechanism is further connected to the side wall of the deep well; the shallow well is connected with the bottom of the deep well through a pre-buried connecting pipe, a first self-priming pump is arranged on the pre-buried connecting pipe, a first salinity sensor is further arranged in the shallow well, the shallow well is connected with the spraying mechanism through a second self-priming pump, the spraying mechanism is further connected with a clean water source through a second pressure pump, and the control mechanism is configured to control the first electromagnetic valve, the first pressure pump, the second pressure pump, the first self-priming pump and the second self-priming pump, and is connected with the water level measuring mechanism and the first salinity sensor through wires; in the saline-alkali soil treatment, the saline-alkali soil of different depths is treated layer by layer by sequentially opening the buried pipes of different depths, collecting underground water of different depths, using neutralizing agents, recycling the purified water source of the shallow well and spraying the spraying system.

2. The device for underground water infiltration and salt alkali discharge of saline and alkaline soil according to claim 1, characterized in that: A second salinity sensor is arranged in the deep well, the water level measuring mechanism comprises a grating ruler arranged along the longitudinal direction of the well wall of the deep well and a guide column fixedly arranged on the inner side of the grating ruler in the longitudinal direction, the bottom end of the guide column is fixedly connected with the bottom of the deep well, a floating plate is slidably sleeved on the guide column, the floating plate is connected with the reading head of the grating ruler, and the second salinity sensor and the grating ruler are respectively connected with the control mechanism; the control mechanism calculates the required amount of neutralizing agent according to the size parameters of the deep well, the height of the grating ruler rising per unit time and the salinity parameters in the deep well, and pumps the required amount of neutralizing agent into the deep well through the first pressure pump.

3. The device for saline-alkali soil groundwater infiltration and salt-alkali discharge according to claim 2, characterized in that: The neutralizing agent container is arranged on the ground, a plurality of groups of nozzle assemblies are longitudinally arranged on the neutralizing agent conveying pipe, each group of nozzle assemblies comprises a plurality of high-pressure nozzles which are uniformly arranged around the axis of the neutralizing agent conveying pipe, the high-pressure nozzles promote the mixing of the neutralizing agent in the underground water by the impact force of the water flow.

4. The device for saline-alkali soil groundwater infiltration and salt-alkali discharge according to claim 3, characterized in that: A cover is arranged at the top end of the shallow well, a water outlet pipe penetrates the cover in the longitudinal direction, the top end of the water outlet pipe is connected with the second self-priming pump, the output end of the second self-priming pump is connected with the spraying mechanism through a first connecting pipe; the control mechanism starts the first self-priming pump according to the amount of underground water entering the deep well per unit time, and controls the rotating speed of the first self-priming pump to prevent the underground water from reaching the depth of the buried pipe corresponding to the bottom of the soil of the treatment depth; the control mechanism also starts the second self-priming pump according to the amount of underground water entering the deep well per unit time, and the flow of the second self-priming pump is equal to or less than the amount of underground water entering the deep well per unit time, so that the saline-alkali soil is circularly sprayed.

5. The device for saline-alkali soil groundwater infiltration and salt-alkali discharge according to claim 4, characterized in that: The first salinity sensor is arranged on the sidewall of the shallow well. When the first salinity sensor detects that the salinity in the shallow well exceeds the standard, the control mechanism stops the second self-priming pump and starts the second pressure pump to spray clean water. In this process, the neutralizing agent is input into the shallow well until the groundwater in the shallow well meets the salinity standard, and then the second pressure pump is closed and the second self-priming pump is restarted.

6. The device for saline-alkali soil groundwater infiltration and saline-alkali discharge according to claim 5, characterized in that: The device for inputting the neutralizing agent into the shallow well comprises a third pressure pump, the input end of the third pressure pump is connected with the neutralizing agent container, the output end is connected with the shallow well, and the third pressure pump is electrically connected with the control mechanism through wires.

7. The device according to claim 6, characterized in that: The support system comprises a plurality of support columns arranged at the outer edge of the saline-alkali soil to be treated and a top frame connected to the top ends of the support columns.

8. The device according to claim 7, characterized in that: The spraying mechanism comprises a water supply main pipe fixed to the lower end of the top frame and a plurality of spraying pipes arranged below the top frame. The water supply main pipe and the spraying pipes are communicated through a second connecting pipe. The lower end of each spraying pipe is uniformly provided with a plurality of spray heads. The spraying pipes and the water supply main pipe are fixedly connected with the top frame through connecting members. One end of the first connecting pipe is connected with the water supply main pipe, and the other end of the water supply main pipe is connected with the output end of the second pressure pump.

9. The device according to claim 8, characterized in that: Each high-pressure spray head is provided with a second electromagnetic valve, and the control mechanism is electrically connected with the second electromagnetic valve.

10. The use of a saline-alkali soil underground water infiltration and saline-alkali discharge device according to claim 9, characterized in that: The method comprises the following steps: step 1, inserting support columns at the outer edge of the saline-alkali soil to be treated and fixing the support columns; erecting a top frame at the top end of the support columns and connecting a water supply main pipe and a spraying pipe; connecting a second pressure pump and connecting the second pressure pump with a clean water source; step 2, burying a deep well in the saline-alkali soil to be treated. The deep well is provided with a plurality of groups of underground pipes according to the different depths of the saline-alkali soil to be treated. Each group of underground pipes corresponds to the position of the bottom of a certain depth of soil layer. The deep well is provided with a neutralizing agent delivery pipe which is connected with a neutralizing agent container on the ground surface through a first pressure pump. A shallow well is buried and connected with the deep well through a pre-buried connecting pipe. The shallow well is connected with the spraying mechanism through a second self-priming pump; step 3, starting the second pressure pump to spray clean water. During the spraying process, the topmost group of underground pipes is opened. The groundwater enters the deep well through the topmost group of underground pipes. The amount of neutralizing agent required to be input into the deep well per unit time is calculated according to the amount of water entering the deep well per unit time, the salinity parameter of the groundwater in the deep well and the size data of the deep well. The neutralizing agent is input into the deep well through the first pressure pump. The groundwater is pumped into the shallow well through the first self-priming pump. The groundwater that meets the standard is pumped to the spraying mechanism through the second self-priming pump. At this time, the second pressure pump is stopped; step 4, when the second salinity sensor detects that the deep well does not need to add neutralizing agent and the groundwater salinity meets the standard, the soil treatment of the next depth is carried out. At this time, the topmost group of underground pipes is closed, and the underground pipes corresponding to the bottom of the further soil layer to be treated are opened. The groundwater enters the deep well through the underground pipes. When the groundwater also meets the standard without adding neutralizing agent, the soil treatment of the next layer is carried out. The process is repeated until the soil layers of the required depth are all treated.

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