Saline-alkali soil washing desalination and gradient salt elimination integrated device

Abstract

The invention provides a saline-alkali soil washing desalination and gradient salt elimination integrated device, and relates to the field of saline-alkali soil washing, the saline-alkali soil washing desalination and gradient salt elimination integrated device comprises a flow dividing pipe fitting and a water collecting tank, the flow dividing pipe fitting is embedded in the right side of saline-alkali soil, three water outlet pipe openings are formed in the left side of the flow dividing pipe fitting, and the left ends of the three water outlet pipe openings are each provided with an electric valve. Through layered arrangement of the surface layer spray-washing pipe fitting, the middle layer spray-washing pipe fitting and the deep layer spray-washing pipe fitting, full-depth washing desalination of surface layer soil, middle layer soil and deep layer soil of the saline-alkali soil is achieved, in addition, the device can accurately adjust the water amount of each layer according to the vertical gradient saline-alkali amount of the saline-alkali soil, and the comprehensive treatment effect on the saline-alkali soil is improved; the problems that a conventional washing desalting device mostly adopts a flood irrigation or surface spray washing mode, only can act on surface soil of the saline-alkali soil, is difficult to wash middle and deep soil, and lacks a mechanism for adjusting water quantity according to vertical gradient saline-alkali quantity, so that the treatment effect is poor are solved.

Description

Technical Field

[0001] The invention relates to the technical field of saline-alkali land water washing, and in particular to a saline-alkali land water washing, desalination and gradient salt removal integrated device. Background Art

[0002] Saline-alkali land is a widespread type of low- to medium-yield land worldwide. Its high salt content severely inhibits plant root water absorption and nutrient transport, leading to low land productivity. In North China, Northwest my country, and western Northeast China, salinization has become a significant constraint on sustainable agricultural development. To improve the quality of saline-alkali land, water-washing and desalination equipment is required.

[0003] Traditional water-washing desalination devices mostly use flooding or surface spraying methods. Whether it is flooding or surface spraying, they only wash and desalinate the surface soil of saline-alkali land, but it is difficult to wash the middle and deep soil of saline-alkali land. There is also a lack of a mechanism to adjust the water volume according to the vertical gradient of salinity and alkali, which reduces the water-washing desalination device's treatment effect on saline-alkali land. Moreover, the saline-alkali water sprayed after the traditional water-washing desalination device sinks to the ground and cannot be effectively recycled and treated, which not only causes a waste of water resources, but also easily pollutes groundwater. Summary of the Invention

[0004] The present invention relates to an integrated device for water washing, desalination and gradient salt removal in saline-alkali land, which solves the problem that traditional water washing and desalination devices mostly adopt flooding or surface spraying methods, can only act on the surface soil of saline-alkali land, and are difficult to effectively wash the middle and deep soil layers. In addition, there is a lack of a mechanism to adjust the water volume according to the vertical gradient of salinity and alkali, resulting in poor treatment effect. At the same time, the saline-alkali water after spraying seeps into the ground but is not recycled and treated, which not only causes waste of water resources but also easily pollutes groundwater.

[0005] According to a first aspect of the present invention, there is provided an integrated device for water washing, desalination and gradient salt removal of saline-alkali land, which specifically comprises: a diversion pipe and a water collecting tank, wherein the diversion pipe is buried inside the right side of the saline-alkali land, and three water outlets are arranged on the left side of the diversion pipe, and the left ends of the three water outlets are each installed with an electric valve, and the water outlet at the left end of each electric valve is connected to a flow metering tube, and the left ends of the three flow metering tubes are connected to a surface spraying pipe, a middle layer spraying pipe and a deep layer spraying pipe in sequence from top to bottom; the water collecting tank is buried inside the left side of the saline-alkali land; a protection box is provided on the left side of the upper part of the saline-alkali land, and a water pump is installed on the bottom end surface of the protection box, and the water suction port at the front end of the water pump is connected to a pumping pipe that passes through the front side wall of the protection box and the top of the water collecting tank, and the water suction end of the pumping pipe is located at the lower side of the inside of the water collecting tank, and a filter is provided at the water suction end of the pumping pipe.

[0006] Furthermore, each flow measuring tube is equipped with a flow sensor, and each flow measuring tube is equipped with a protective cover outside the flow sensor, and each protective cover is provided with a cable outlet A on the top; the upper end of the diversion pipe is connected to the water inlet pipe.

[0007] Furthermore, the surface spraying pipe is evenly provided with spraying heads on the outside, and each spraying head is fixedly connected to a fixed plate on the outside, and the outer side of each fixed plate is rotatably connected to a shielding plate through a rotating shaft, and a torsion spring is sleeved on the outside of each rotating shaft.

[0008] Furthermore, the outside of the middle-layer spray pipe is evenly provided with spray pipes, and the outer circumference of each spray pipe is evenly opened with circular holes, the outside of each spray pipe is covered with a permeable cloth sleeve A, and the outside of each permeable cloth sleeve A is covered with a drainage blind pipe A.

[0009] Furthermore, the deep-layer spraying pipe fittings are evenly provided with spraying pipe heads on the outside, and each spraying pipe head is evenly provided with circular through holes on the outer circumference, each spraying pipe head is covered with a permeable cloth sleeve B on the outside, and each permeable cloth sleeve B is covered with a drainage blind pipe B on the outside.

[0010] Furthermore, six water inlets are provided on the right side of the water collecting tank, and the right end of each water inlet is connected to a drainage pipe, and a circular water inlet hole is evenly opened on the outside of each drainage pipe, and a permeable cloth cover C is provided on the outside of each drainage pipe, and a seepage drainage blind pipe C is provided on the outside of each permeable cloth cover C.

[0011] Furthermore, an inspection port is provided on the top of the water collecting tank, and a safety baffle is installed on the upper end of the inspection port; a reinforcement frame is provided inside the water collecting tank.

[0012] Furthermore, a controller is installed inside the protection box; and the rear end water outlet of the water pump is connected to a discharge hose that passes through the rear side wall of the protection box.

[0013] Furthermore, each electric valve is provided with a protective shell on the outside, and the protective shell includes a rear shell and a front shell. The rear shell and the front shell are fixedly connected to the outside of the water outlet pipe and the opposite end of the flow measuring tube by bolts, and a sealing rubber gasket is provided between the rear shell and the front shell; a cable outlet B is provided on the top of the front shell.

[0014] The present invention provides an integrated device for water washing, desalination and gradient salt removal for saline-alkali land, which has the following beneficial effects:

[0015] 1. Through the layered setting of surface spraying pipes, middle spraying pipes and deep spraying pipes, when washing and desalting saline-alkali land, fresh water is transported to the inside of the diversion pipe through the water inlet pipe, and then three electric valves are opened by the controller to make the fresh water flow synchronously into the three flow measuring pipes, surface spraying pipes, middle spraying pipes and deep spraying pipes, thereby achieving full-depth water washing and desalination of the surface, middle and deep layers of soil in saline-alkali land. In addition, this device can accurately adjust the water volume of each layer according to the vertical gradient of salinity and alkali in the saline-alkali land, which greatly improves the comprehensive treatment effect of the device on saline-alkali land and ensures that the saline and alkali components of soil layers at different depths are targeted.

[0016] 2. Through the arrangement of the water collecting tank, the water inlet, the circular water inlet hole, the permeable cloth sleeve C and the seepage drainage blind pipe C, the washed saline-alkali water can pass through the seepage drainage blind pipe C and the permeable cloth sleeve C through the circular water inlet hole into the interior of the discharge pipe, and then be discharged into the water collecting tank through the discharge pipe and the water inlet. The water pump is then started by the controller to generate negative pressure in the pumping pipe, thereby discharging the saline-alkali water collected in the water collecting tank through the discharge hose to the external purification equipment. The underground infiltration of the saline-alkali water is effectively reduced through purification treatment, thereby realizing the recycling of water resources and reducing the risk of groundwater pollution.

[0017] 3. Through the cooperation of the fixed plate, rotating shaft, baffle plate and torsion spring, when the spray head stops spraying water, the baffle plate loses the water pressure impact effect. At this time, the elastic force of the torsion spring drives the baffle plate with the rotating shaft as the fulcrum, automatically covering the water outlet of the spray head, forming an effective shielding protection, which can not only prevent debris from entering, but also prevent the water outlet from being blocked due to the accumulation of foreign matter, avoiding trouble for subsequent maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings of the present invention will be briefly introduced below.

[0019] In the attached figure:

[0020] Figure 1 A schematic diagram showing the structure of the first perspective of the present application is shown;

[0021] Figure 2 A schematic diagram showing the structure of the second viewing angle of the present application is shown;

[0022] Figure 3 A schematic structural diagram of a partial cross-section of the saline-alkali land of the present application is shown;

[0023] Figure 4 The schematic diagram of the structure of the diversion pipe fitting, the surface spraying pipe fitting, the middle spraying pipe fitting, the deep spraying pipe fitting and the water collecting tank of the present application is shown;

[0024] Figure 5A schematic diagram of a partial cross-section of the protective cover of the present application is shown;

[0025] Figure 6 The schematic diagram of the structure of the surface spray cleaning pipe fitting of the present application is shown;

[0026] Figure 7 Shows the application Figure 6 A schematic diagram of the partially enlarged structure at center A;

[0027] Figure 8 The schematic diagram shows the structure of the spray cleaning pipe, the permeable cloth sleeve A and the drainage blind pipe A after being disassembled;

[0028] Figure 9 The schematic diagram shows the structure of the spray cleaning pipe head, the permeable cloth sleeve B and the drainage blind pipe B after being disassembled;

[0029] Figure 10 A schematic diagram of a partial cross-section of the water collecting tank of the present application is shown;

[0030] Figure 11 The figure shows the schematic diagram of the structure after the circular water inlet hole, the permeable cloth sleeve C and the drainage blind pipe of the present application are disassembled;

[0031] Figure 12 The schematic diagram shows the structure of the water outlet pipe, flow measuring tube, electric valve and protective shell after being disassembled.

[0032] Reference Signs List

[0033] 1. Diverter pipe; 101. Water inlet pipe; 102. Water outlet pipe; 103. Flow meter; 104. Electric valve; 105. Flow sensor; 106. Protective cover; 107. Cable outlet A;

[0034] 2. Saline-alkali land;

[0035] 3. Surface spray pipe fittings; 301. Spray head; 302. Fixed plate; 303. Shielding plate; 304. Rotating shaft; 305. Torsion spring;

[0036] 4. Middle-layer spray-wash pipe fittings; 401. Spray-wash pipe; 402. Round hole; 403. Permeable cloth cover A; 404. Seepage drainage blind pipe A;

[0037] 5. Deep spray cleaning pipe fittings; 501. Spray cleaning pipe head; 502. Circular through hole; 503. Permeable cloth cover B; 504. Seepage drainage blind pipe B;

[0038] 6. Water collecting tank; 601. Water inlet; 602. Inspection port; 603. Safety baffle; 604. Reinforcement frame; 605. Drain pipe; 606. Circular water inlet hole; 607. Permeable fabric cover C; 608. Seepage drainage blind pipe C;

[0039] 7. Protective box; 701. Water pump; 702. Controller; 703. Water pump; 704. Discharge hose;

[0040] 8. Protective housing; 801. Rear housing; 802. Front housing; 803. Sealing gasket; 804. Cable outlet B. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Example 1: Please refer to Figures 1 to 12 :

[0043] The present invention proposes an integrated device for water washing, desalination and gradient salt removal in saline-alkali land, comprising: a diversion pipe 1 and a water collecting tank 6, the diversion pipe 1 is buried inside the right side of the saline-alkali land 2, and three water outlets 102 are provided on the left side of the diversion pipe 1, and an electric valve 104 is installed at the left end of the three water outlets 102, and the water outlet at the left end of each electric valve 104 is connected to a flow meter 103, and the left ends of the three flow meter pipes 103 are connected to a surface spray pipe 3, a middle layer spray pipe 4 and a deep layer spray pipe 5 in sequence from top to bottom; the water collecting tank 6 is buried inside the left side of the saline-alkali land 2; a protection box 7 is provided on the left side of the upper part of the saline-alkali land 2, and a water pump is installed on the bottom end surface of the protection box 7 701. The front-end water suction port of the water pump 701 is connected to a pumping pipe 703 which passes through the front side wall of the protective box 7 and the top of the water collecting box 6, and the suction end of the pumping pipe 703 is located at the lower side of the inside of the water collecting box 6, and a filter is provided at the suction end of the pumping pipe 703 to prevent blockage caused by debris entering the inside of the pumping pipe 703; through the layered arrangement of the surface spraying pipe 3, the middle spraying pipe 4 and the deep spraying pipe 5, fresh water can flow into the three flow measuring pipes 103, the surface spraying pipe 3, the middle spraying pipe 4 and the deep spraying pipe 5, thereby realizing full-depth water washing and desalination of the surface, middle and deep layers of the saline-alkali land 2, thereby improving the comprehensive treatment effect of the device on the saline-alkali land 2.

[0044] A flow sensor 105 is installed on each flow measuring tube 103, and a protective cover 106 is installed on the outside of the flow sensor 105 on each flow measuring tube 103. A cable outlet A107 is provided on the top of each protective cover 106 for passing the cable connected to the flow sensor 105; the upper end of the diversion pipe 1 is connected to the water inlet pipe 101; through the setting of the flow sensor 105, the amount of fresh water entering the surface spraying pipe 3, the middle spraying pipe 4 and the deep spraying pipe 5 can be detected in real time, so that the amount of fresh water during water washing and desalination of the saline-alkali land 2 can be accurately controlled.

[0045] The outside of the surface spraying pipe 3 is evenly provided with spraying heads 301, and each spraying head 301 is fixedly connected to the outside with a fixed plate 302, and the outer side of each fixed plate 302 is rotatably connected to a baffle 303 through a rotating shaft 304, and a torsion spring 305 is sleeved on the outside of each rotating shaft 304; through the cooperation of the fixed plate 302, the rotating shaft 304, the baffle 303 and the torsion spring 305, when the spraying head 301 stops spraying water, the baffle 303 loses the water pressure impact effect. At this time, the elastic force of the torsion spring 305 drives the baffle 303 with the rotating shaft 304 as the fulcrum, automatically covering the water outlet of the spraying head 301, forming an effective shielding protection to prevent debris from entering.

[0046] The outside of the middle-layer spray pipe fitting 4 is evenly provided with spray pipes 401, and the outer circumferential surface of each spray pipe 401 is evenly opened with circular holes 402, the outside of each spray pipe 401 is covered with a permeable cloth sleeve A403, and the outside of each permeable cloth sleeve A403 is covered with a drainage blind pipe A404; through the arrangement of the middle-layer spray pipe fitting 4, the middle-layer soil of the saline-alkali land 2 is used for water washing and desalination treatment.

[0047] The deep-layer spraying pipe fitting 5 is evenly provided with spraying pipe heads 501, and the outer peripheral surface of each spraying pipe head 501 is evenly provided with circular through holes 502. The outside of each spraying pipe head 501 is covered with a permeable cloth sleeve B503, and the outside of each permeable cloth sleeve B503 is covered with a drainage blind pipe B504. The deep-layer spraying pipe fitting 5 is provided to perform water washing and desalination treatment on the deep soil of the saline-alkali land 2.

[0048] Six water inlets 601 are arranged on the right side of the water collecting box 6, and the right end of each water inlet 601 is connected to a discharge pipe 605, and each discharge pipe 605 is evenly provided with a circular water inlet hole 606 on the outside, and each discharge pipe 605 is covered with a permeable cloth sleeve C607 on the outside, and each permeable cloth sleeve C607 is covered with a seepage drainage blind pipe C608 on the outside; through the arrangement of the water collecting box 6, the water inlet 601, the circular water inlet hole 606, the permeable cloth sleeve C607 and the seepage drainage blind pipe C608, the underground infiltration of saline water can be reduced, which not only realizes the recycling of water resources, but also reduces the risk of groundwater pollution.

[0049] An inspection port 602 is provided on the top of the water collecting tank 6 , and a safety baffle 603 is installed on the upper end of the inspection port 602 ; a reinforcement frame 604 is provided inside the water collecting tank 6 to improve the strength of the water collecting tank 6 when used inside the saline-alkali land 2 .

[0050] A controller 702 is installed inside the protective box 7; the rear end water outlet of the water pump 701 is connected to a discharge hose 704 that passes through the rear side wall of the protective box 7; the water pump 701, the electric valve 104, and the flow sensor 105 are all electrically connected to the controller 702, and the controller 702, the water pump 701, the electric valve 104, and the flow sensor 105 are all powered by the power grid.

[0051] Example 2, based on Example 1, Figure 2 and Figure 12 As shown, a protective shell 8 is provided on the outside of each electric valve 104, and the protective shell 8 includes a rear shell 801 and a front shell 802. The rear shell 801 and the front shell 802 are fixedly connected to the outside of the opposite ends of the water outlet pipe 102 and the flow tube 103 by bolts, and a sealing rubber gasket 803 is provided between the rear shell 801 and the front shell 802; a cable outlet B804 is provided on the top of the front shell 802, and the cable outlet B804 is used to pass the cable connected to the electric valve 104, and after the cable passes through, the cable outlet B804 can be filled with sealant to improve the sealing effect; through the provision of the protective shell 8, the electric valve 104 can be effectively protected, and the service life of the electric valve 104 is improved.

[0052] The working principle of the present invention is as follows: when washing and desalting the saline-alkali land 2, fresh water is transported to the inside of the diversion pipe 1 through the water inlet pipe 101, and then the three electric valves 104 are opened by the controller 702, and the fresh water enters the three flow measuring pipes 103, the surface spraying pipe 3, the middle spraying pipe 4 and the deep spraying pipe 5. Under the action of water pressure, the baffle 303 is pushed open, so that the fresh water in the surface spraying pipe 3 is sprayed to the upper soil surface of the saline-alkali land 2, and then the fresh water in the middle spraying pipe 4 is infiltrated into the saline-alkali land 2 through the spraying pipe 401, the circular hole 402, the permeable cloth cover A403 and the drainage blind pipe A404. In the layer of soil, at the same time, the fresh water inside the deep-layer spraying pipe 5 penetrates into the deep soil of the saline-alkali land 2 through the spraying pipe head 501 and the circular through-hole 502 through the permeable cloth sleeve B503 and the drainage blind pipe B504, so that the surface, middle and deep layers of the saline-alkali land 2 can be effectively washed with water, and the amount of water passing through the surface spraying pipe 3, the middle spraying pipe 4 and the deep spraying pipe 5 can be adjusted according to the vertical gradient of salinity in the saline-alkali land 2. When making specific adjustments, the opening of the three electric valves 104 can be controlled by the controller 702 to achieve this. In this way, the treatment effect of the device on the saline-alkali land 2 is greatly improved.

[0053] The saline-alkali water after washing passes through the seepage drainage blind pipe C608 and the permeable cloth cover C607 into the discharge pipe 605 through the circular water inlet hole 606, and then is discharged into the water collecting tank 6 through the discharge pipe 605 and the water inlet 601. Then, the water pump 701 is started by the controller 702 to generate negative pressure in the pumping pipe 703, thereby discharging the saline-alkali water collected in the water collecting tank 6 through the discharge hose 704 to the external purification equipment. The saline-alkali water is treated by the external purification equipment, thereby effectively reducing the amount of saline-alkali water sinking to the ground, which not only effectively saves water resources, but also greatly reduces the pollution caused to groundwater.

[0054] When the spray head 301 stops spraying water, the baffle 303 loses its water pressure impact effect, and then at this time, under the elastic force of the torsion spring 305, the baffle 303 is forced to automatically close at the water outlet of the spray head 301, so that the water outlet of the spray head 301 is effectively shielded and protected, preventing debris from entering and preventing the spray head 301 from being blocked.

[0055] In this article, there are several points to note:

[0056] 1. The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0057] 2. In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to form new embodiments.

[0058] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An integrated device for water washing, desalination and gradient salt removal for saline-alkali land, comprising: The diversion pipe (1) and the water collecting box (6) are characterized in that the diversion pipe (1) is buried inside the right side of the saline-alkali land (2), and three water outlets (102) are provided on the left side of the diversion pipe (1), and an electric valve (104) is installed at the left end of each of the three water outlets (102). The left end of each electric valve (104) is connected to a flow meter (103), and the left ends of the three flow meter pipes (103) are connected to the surface spray pipe (3), the middle spray pipe (4) and the water outlet (5) in sequence from top to bottom. ) and deep-layer spray-washing pipe fittings (5); the water collecting tank (6) is buried inside the left side of the saline-alkali land (2); a protection box (7) is provided on the left side of the upper part of the saline-alkali land (2), and a water pump (701) is installed on the bottom end surface of the protection box (7), and the front end water suction port of the water pump (701) is connected to a water pump (703) that passes through the front side wall of the protection box (7) and the top of the water collecting tank (6), and the water suction end of the water pump (703) is located on the lower side of the inside of the water collecting tank (6), and a filter is provided at the water suction end of the water pump (703).

2. The integrated device for water washing, desalination and gradient salt removal for saline-alkali land according to claim 1, characterized in that: A flow sensor (105) is installed on each flow measuring tube (103), and a protective cover (106) is installed on the outside of the flow sensor (105) on each flow measuring tube (103), and a cable outlet A (107) is provided on the top of each protective cover (106); the upper end of the diversion pipe (1) is connected to the water inlet pipe (101).

3. The integrated device for washing, desalting and gradient salt removal for saline-alkali land according to claim 1, characterized in that: The surface spraying pipe (3) is evenly provided with spraying heads (301) on the outside, and each spraying head (301) is fixedly connected to a fixed plate (302) on the outside, and the outer side of each fixed plate (302) is rotatably connected to a shielding plate (303) via a rotating shaft (304), and a torsion spring (305) is sleeved on the outside of each rotating shaft (304).

4. The integrated device for water washing, desalination and gradient salt removal for saline-alkali land according to claim 1, characterized in that: The middle-layer spray pipe (4) is evenly provided with spray pipes (401) on its exterior, and each spray pipe (401) is evenly provided with a circular hole (402) on its outer circumference. Each spray pipe (401) is also covered with a water-permeable cloth sleeve A (403), and each water-permeable cloth sleeve A (403) is also covered with a drainage blind pipe A (404).

5. The integrated device for water washing, desalination and gradient salt removal for saline-alkali land according to claim 1, characterized in that: The deep-layer spraying pipe (5) is evenly provided with spraying pipe heads (501) on its exterior, and each spraying pipe head (501) is evenly provided with a circular through hole (502) on its outer circumference. Each spraying pipe head (501) is covered with a water-permeable cloth sleeve B (503) on its exterior, and each water-permeable cloth sleeve B (503) is covered with a drainage blind pipe B (504) on its exterior.

6. The integrated device for water washing, desalination and gradient salt removal for saline-alkali land according to claim 1, characterized in that: The water collecting box (6) is provided with six water inlets (601) on the right side, and the right end of each water inlet (601) is connected to a drainage pipe (605), and the outside of each drainage pipe (605) is uniformly provided with a circular water inlet hole (606), and the outside of each drainage pipe (605) is covered with a permeable cloth sleeve C (607), and the outside of each permeable cloth sleeve C (607) is covered with a drainage blind pipe C (608).

7. The integrated device for water washing, desalination and gradient salt removal for saline-alkali land according to claim 1, characterized in that: The top of the water collecting box (6) is provided with an inspection port (602), and a safety baffle (603) is installed on the upper end of the inspection port (602); a reinforcement frame (604) is provided inside the water collecting box (6).

8. The integrated device for water washing, desalination and gradient salt removal for saline-alkali land according to claim 1, characterized in that: A controller (702) is installed inside the protection box (7); and a water outlet at the rear end of the water pump (701) is connected to a discharge hose (704) that passes through the rear side wall of the protection box (7).

9. The integrated device for water washing, desalination and gradient salt removal for saline-alkali land according to claim 1, characterized in that: Each electric valve (104) is provided with a protective shell (8) on the outside. The protective shell (8) includes a rear shell (801) and a front shell (802). The rear shell (801) and the front shell (802) are fixedly connected to the outside of the opposite ends of the water outlet pipe (102) and the flow measuring tube (103) by bolts, and a sealing rubber gasket (803) is provided between the rear shell (801) and the front shell (802); and a cable outlet B (804) is provided on the top of the front shell (802).

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