Agricultural saline-alkali soil improvement and salt elimination equipment

Abstract

The invention discloses agricultural saline-alkali soil improvement salt elimination equipment which comprises a box body, a baffle is fixed in the box body, a rotating rod driven by a movable plate is rotatably mounted in a salt elimination pipe, a driving screw is fixed on the rotating rod, and a movable rod of the driving screw is connected with a hollow sealing plug capable of sealing the salt elimination pipe. A piston plate located above the through hole is slidably connected into the blind pipe, the piston plate is connected with a rotating rod through a time delay mechanism, the movable plate moves downwards to drive the rotating rod to rotate, the rotating rod rotates to drive a driving screw to rotate to enable a sealing plug to seal the salt discharging pipe, and meanwhile the piston plate moves downwards to extrude air to enable the air to reversely blow the filter screen. According to the device, the blocked filter screen can be backwashed and cleaned, the situation that water containing salt cannot be rapidly discharged and cleaned due to blockage of the filter screen is avoided, and meanwhile, the semipermeable membrane can be cleaned, so that it is ensured that salt in water can be effectively filtered.

Description

Technical Field

[0001] The present invention relates to the technical field of saline-alkali land improvement and salt drainage, and particularly relates to an agricultural saline-alkali land improvement and salt drainage device. Background Art

[0002] In the prior art, the improvement method for saline-alkali land usually treats it by washing salt. Washing salt means filling water into the saline-alkali land to dissolve the soil salt, and then discharging the soluble saline-alkali in the surface soil layer to the deep soil layer or leaching it out through infiltration, and infiltrating into the drainage ditch for exclusion.

[0003] A saline-alkali land salt drainage system with the publication number of CN208754655U in the prior art has the following technical solution: It includes a salt drainage pipe and a salt collection well. An osmotic membrane that divides the salt collection well into a filtration cavity and a water outlet cavity is provided in the salt collection well. The filtration cavity is communicated with the salt drainage pipe. A discharge pipe is provided at the bottom of the filtration cavity, and a one-way solenoid valve is provided on the discharge pipe. A trigger member that opens and closes the one-way solenoid valve according to the water volume in the collection cavity is provided at the bottom of the collection box. The salt drainage pipe is provided with a one-way valve that restricts the flow of fluid from the salt collection well to the salt drainage pipe. A large amount of brine enters the salt collection well through the salt drainage pipe. The water desalinated by the osmotic membrane can flow back to the saline-alkali land to reduce water resource waste. When there is too much brine, the one-way solenoid valve can be opened to discharge the brine in the filtration cavity through the discharge pipe, so that the brine in the salt drainage pipe enters the salt collection well for osmotic filtration, improving the stability of the osmotic effect.

[0004] The deficiencies of the above prior art are as follows: As the brine enters the salt drainage pipe through the water seepage holes and through holes, the soil in the soil will block the filter screen, resulting in a decrease in its water inflow. Especially during irrigation and salt drainage or rainy weather, water cannot be discharged in time, resulting in a reduction in the salt drainage treatment effect. Therefore, the present application proposes an agricultural saline-alkali land improvement and salt drainage device. Summary of the Invention

[0005] The purpose of the present invention is to solve the above technical problems and propose an agricultural saline-alkali land improvement and salt drainage device.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions: An agricultural saline-alkali land improvement and salt drainage device, comprising a box body. A baffle is fixed inside the box body. A semi-permeable membrane is movably installed on the baffle. The baffle divides the box body into a drainage cavity and a filtration cavity. A salt drainage pipe is installed through the box body. A plurality of blind pipes are installed on the salt drainage pipe. A plurality of through holes are provided through the blind pipes. Filter meshes are installed in the through holes. A movable plate capable of moving up and down is slidably connected in the filtration cavity. A rotating rod driven by the movable plate is rotatably installed in the salt drainage pipe. A driving screw rod is fixed on the rotating rod. The driving screw rod is movably connected with a sealing plug which can seal the salt drainage pipe and is hollow. A piston plate located above the through hole is slidably connected in the blind pipe. The piston plate is connected with the rotating rod through a delay mechanism. The downward movement of the movable plate drives the rotating rod to rotate. The rotation of the rotating rod drives the driving screw rod to rotate to seal the salt drainage pipe with the sealing plug, and at the same time makes the piston plate move downward to extrude air to blow the filter mesh reversely.

[0007] Preferably, a circular groove and a mounting groove are provided through the baffle. A circular frame is rotatably installed in the circular groove. The semi-permeable membrane is installed in the circular frame. The upper end of the circular frame is fixedly connected with a short shaft. The short shaft penetrates through the baffle and is rotatably connected with it, and extends into the mounting groove. A worm gear is installed on the short shaft. A worm is meshed with the worm gear. An installation frame is installed inside the box body. A gearbox is installed on the installation frame. One shaft end of the gearbox is fixedly connected with the worm. The other shaft end of the gearbox is fixed with a transmission rod capable of rotating following the rotating rod.

[0008] Preferably, a coupling is installed on the transmission rod. A shaft rod is fixed on the coupling. A gear is fixedly connected to the shaft rod. A rack plate is meshed with the gear. The rack plate is fixed on the movable plate.

[0009] Preferably, an electric push rod is fixed on the inner bottom of the box body. The output end of the electric push rod is fixedly connected with the upper end of the movable plate.

[0010] Preferably, an L-shaped frame is fixed inside the box body. A rectangular sleeve is provided through the L-shaped frame and is slidably arranged. The rectangular sleeve is sleeved outside the driving screw rod and is in fit connection with it. An installation ring is fixed on the rectangular sleeve. The sealing plug is fixed on the installation ring.

[0011] Preferably, it further comprises a cleaning mechanism capable of backwashing and cleaning the semi-permeable membrane. The cleaning mechanism includes a short rod which penetrates through the baffle and is rotatably connected with it. A first screw rod and a second screw rod are respectively fixed at both ends of the short rod. Movable frames located in the drainage cavity and the filtration cavity respectively are slidably connected inside the box body. The first screw rod and the second screw rod respectively penetrate through the movable frames on the same side and are in threaded connection with them. A sealing cover capable of covering the outside of the semi-permeable membrane is fixed on the movable frame. A liquid discharge pipe is installed at the bottom of the sealing cover located in the drainage cavity.

[0012] Preferably, the thread directions of the first screw rod and the second screw rod are arranged in opposite directions, and a driven shaft is fixed on the second screw rod, and the driven shaft is connected to the shaft rod through a transmission mechanism.

[0013] Preferably, the transmission mechanism includes a first transmission wheel fixed on the driven shaft, a second transmission wheel fixed on the shaft rod, and the first transmission wheel and the second transmission wheel are connected by a belt.

[0014] Preferably, a pressure boosting mechanism for increasing the backwashing intensity of the semi-permeable membrane is further included. The pressure boosting mechanism includes a piston cylinder installed in the box body. A moving piston is slidably connected in the piston cylinder. A threaded cylinder is fixedly connected to the moving piston. A reciprocating screw rod is threadedly connected in the threaded cylinder. The reciprocating screw rod is fixedly connected to the driven shaft. A liquid inlet pipe and a liquid outlet pipe are installed at the bottom of the piston cylinder. The liquid outlet pipe is connected to the sealing cover in the filter cavity. A first one-way valve is installed on the liquid inlet pipe, and a second one-way valve is installed on the liquid outlet pipe.

[0015] Preferably, the plurality of blind pipes are connected by a communicating pipe, and the communicating pipe is located above the piston plate, and a solenoid valve is installed at the end of the communicating pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The downward movement of the rack plate drives the gear to rotate. The rotation of the gear drives the shaft rod to rotate. The rotation of the shaft rod drives the driving screw rod to rotate. Since the rectangular sleeve cannot rotate under the L-shaped frame, the rectangular sleeve moves and drives the mounting ring and the sealing plug to move. Finally, the sealing plug extends into the salt discharge pipe to seal the salt discharge pipe, preparing for the backwashing cleaning of the filter screen.

[0017] 2. The rotation of the rotating rod can wind up the pulling rope. The winding of the pulling rope drives the connecting block and the movable ring to move downward. At this time, the spring is stretched. Since there is negative pressure in the sealed space above the piston plate, the piston plate moves a small distance and stops, having a time delay effect, avoiding the air being unable to be quickly squeezed out and reducing the backwashing effect on the filter screen.

[0018] 3. Under the pulling of the spring, the piston plate moves downward quickly, so as to squeeze the air or water in the blind pipe. Since the salt discharge pipe is blocked, the air and water are discharged through the through holes. In this way, the filter screen can be backblown and backwashed to prevent the filter screen from being blocked and meet the requirements of rapid water passing and drainage.

[0019] 4. The transmission through the coupling drives the transmission rod to rotate. The rotation of the transmission rod makes the worm rotate quickly through the gearbox. The worm drives the worm wheel to rotate, so that the short shaft and the semi-permeable membrane rotate, preparing for subsequent cleaning.

[0020] 5. When the two sealing covers abut against the baffle, the annular hollow rubber will be squeezed, thus squeezing the air between the two sealing covers, causing part of the air to be backflushed through the semi-permeable membrane, and the air is discharged through the drain pipe.

[0021] 6. It can make the threaded cylinder and the moving piston reciprocate. When the moving piston moves closer to the reciprocating lead screw, the water on the movable plate can be sucked into the piston cylinder through the liquid inlet pipe. When the moving piston moves away from the reciprocating lead screw, the water can be discharged through the liquid outlet pipe and conveyed into the sealing cover, and the water can backwash the semi-permeable membrane; when the movable plate moves down and the amount of water extracted decreases and it is impossible to extract water, air will be extracted, so that the air can blow and wash the semi-permeable membrane, thus realizing the cleaning of the semi-permeable membrane.

[0022] In summary, the present invention can perform backflushing cleaning on the clogged filter screen, prevent it from being clogged and unable to quickly discharge and clean the salt-containing water, and at the same time can realize the cleaning of the semi-permeable membrane to ensure that it can effectively filter the salt in the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an agricultural saline-alkali land improvement and salt drainage device proposed by the present invention; Figure 2 It is a cross-sectional view of the box body in an agricultural saline-alkali land improvement and salt drainage device proposed by the present invention; Figure 3 It is an internal schematic diagram of the box body in an agricultural saline-alkali land improvement and salt drainage device proposed by the present invention; Figure 4 It is a schematic structural diagram of the first screw and the second screw in an agricultural saline-alkali land improvement and salt drainage device proposed by the present invention; Figure 5 It is a schematic structural diagram of the gear in an agricultural saline-alkali land improvement and salt drainage device proposed by the present invention; Figure 6 It is a schematic structural diagram at the piston cylinder in an agricultural saline-alkali land improvement and salt drainage device proposed by the present invention; Figure 7 It is a cross-sectional view of the salt drainage pipe in an agricultural saline-alkali land improvement and salt drainage device proposed by the present invention.

[0024] In the figure: 1 box body, 2 salt discharge pipe, 3 blind pipe, 4 through hole, 5 connecting pipe, 6 solenoid valve, 7 baffle plate, 8 movable plate, 9 electric push rod, 10 semi-permeable membrane, 11 sealing cover, 12 supporting round rod, 13 movable frame, 14 first screw rod, 15 second screw rod, 16 gearbox, 17 driven shaft, 18 reciprocating screw rod, 19 piston cylinder, 20 rack plate, 21 mounting frame, 22 L-shaped frame, 23 mounting ring, 24 mounting groove, 25 short shaft, 26 liquid discharge pipe, 27 short rod, 28 first transmission wheel, 29 belt, 30 second transmission wheel, 31 worm gear, 32 worm, 33 transmission rod, 34 coupling, 35 shaft rod, 36 rectangular sleeve, 37 sealing plug, 38 driving screw rod, 39 connecting block, 40 gear, 41 movable ring, 42 moving piston, 43 threaded cylinder, 44 spring, 45 liquid inlet pipe, 46 liquid outlet pipe, 47 first one-way valve, 48 second one-way valve, 49 rotating rod, 50 pull rope, 51 piston plate. Detailed implementation manner

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0026] Refer to Figures 1 - 7 , an agricultural saline-alkali land improvement and salt discharge device, including a box body 1, a baffle plate 7 is fixed inside the box body 1, a semi-permeable membrane 10 is movably installed on the baffle plate 7, and the semi-permeable membrane 10 is located above the movable plate 8; through the semi-permeable membrane 10 (or osmotic membrane), salts and impurities in the water can be removed, so as to achieve desalination; a circular groove and a mounting groove 24 are provided through the baffle plate 7, a circular frame is rotatably installed in the circular groove, the semi-permeable membrane is installed in the circular frame, the upper end of the circular frame is fixedly connected with a short shaft 25, the short shaft 25 penetrates through the baffle plate 7 and is rotatably connected therewith, and extends into the mounting groove 24, a worm gear 31 is installed on the short shaft 25, a worm 32 is meshed with the worm gear 31, a mounting frame 21 is installed inside the box body 1, a gearbox 16 is installed on the mounting frame 21, the worm 32 is fixedly connected with one shaft end of the gearbox 16, and a transmission rod 33 that can rotate following the rotating rod 49 is fixed at the other shaft end of the gearbox 16.

[0027] The baffle plate 7 divides the box body 1 into a drainage cavity and a filtering cavity. A salt discharge pipe 2 is installed through the box body 1. A plurality of blind pipes 3 are installed on the salt discharge pipe 2. The plurality of blind pipes 3 are connected by a connecting pipe 5. The connecting pipe 5 is located above the piston plate 51, and a solenoid valve 6 is installed at the end of the connecting pipe 5. The connecting pipe 5 and the solenoid valve 6 are located above the soil. A plurality of through holes 4 are provided through the blind pipe 3, a filter screen is installed in the through holes 4, a movable plate 8 that can move up and down is slidably connected in the filtering cavity, and the movable plate 8 seals and slides up and down; an electric push rod 9 is fixed at the inner bottom of the box body 1, and the output end of the electric push rod 9 is fixedly connected with the upper end of the movable plate 8.

[0028] A rotating rod 49 driven by a movable plate 8 is rotatably installed in the salt drainage pipe 2. A driving screw 38 is fixed on the rotating rod 49. A coupling 34 is installed on the transmission rod 33. A shaft rod 35 is fixed on the coupling 34. A gear 40 is fixedly connected to the shaft rod 35. A rack plate 20 is meshed with the gear 40. The rack plate 20 is fixed on the movable plate 8.

[0029] The driving screw 38 is movably connected to a sealing plug 37 which can seal the salt drainage pipe 2 and is hollow. An L-shaped frame 22 is fixed in the box body 1. A rectangular sleeve 36 which is slidably arranged is penetrated through the L-shaped frame 22. The rectangular sleeve 36 is sleeved outside the driving screw 38 and is in fit connection with it. An installation ring 23 is fixed on the rectangular sleeve 36. The sealing plug 37 is fixed on the installation ring 23.

[0030] A piston plate 51 which is located above the through hole 4 is slidably connected in the blind pipe 3. The piston plate 51 is connected to the rotating rod 49 through a delay mechanism. The delay mechanism includes a movable ring 41 which slides in the blind pipe 3. Springs 44 are fixed on the movable ring 41 and the piston plate 51. A connecting block 39 is fixed in the movable ring 41. A pull rope 50 is fixed on the connecting block 39. The pull rope 50 is fixed on the rotating rod 49.

[0031] The downward movement of the movable plate 8 drives the rotating rod 49 to rotate. The rotation of the rotating rod 49 drives the driving screw 38 to rotate to seal the salt drainage pipe 2 by the sealing plug 37. At the same time, the piston plate 51 moves downward to squeeze air to blow the filter screen in the opposite direction.

[0032] It further includes a cleaning mechanism capable of backwashing and cleaning the semi-permeable membrane 10. The cleaning mechanism includes a short rod 27 which penetrates through the baffle 7 and is rotatably connected to it. First screw rods 14 and second screw rods 15 are respectively fixed at both ends of the short rod 27. The end of the first screw rod 14 is rotatably installed on the inner wall of the box body 1 through a supporting round rod 12; the thread directions of the first screw rod 14 and the second screw rod 15 are set in opposite directions, and a driven shaft 17 is fixed on the second screw rod 15. The driven shaft 17 is connected to the shaft rod 35 through a transmission mechanism. The transmission mechanism includes a first transmission wheel 28 fixed on the driven shaft 17. A second transmission wheel 30 is fixed on the shaft rod 35. The first transmission wheel 28 and the second transmission wheel 30 are connected by a belt 29.

[0033] Movable frames 13 which are respectively located in the drainage cavity and the filtration cavity are slidably connected in the box body 1. The first screw rod 14 and the second screw rod 15 respectively penetrate through the movable frames 13 on the same side and are in threaded connection with them. A sealing cover 11 capable of covering the outside of the semi-permeable membrane 10 is fixed on the movable frames 13. An annular hollow rubber ring is fixed at the end of the sealing cover 11, which can deform and reset; a liquid discharge pipe 26 is installed at the bottom of the sealing cover 11 located in the drainage cavity.

[0034] It also includes a pressurizing mechanism for increasing the backwashing intensity of the semi-permeable membrane 10. The pressurizing mechanism includes a piston cylinder 19 installed in the box body 1. A moving piston 42 is slidably connected in the piston cylinder 19. A threaded cylinder 43 is fixedly connected to the moving piston 42. A reciprocating lead screw 18 is threadedly connected in the threaded cylinder 43. The reciprocating lead screw 18 is fixedly connected to the driven shaft 17. A liquid inlet pipe 45 and a liquid outlet pipe 46 are installed at the bottom of the piston cylinder 19. The liquid outlet pipe 46 is connected to the sealing cover 11 in the filtering cavity. A first one-way valve 47 is installed on the liquid inlet pipe 45. The first one-way valve 47 allows fluid to enter the piston cylinder 19 through the liquid inlet pipe 45. A second one-way valve 48 is installed on the liquid outlet pipe 46. The second one-way valve 48 allows the fluid in the piston cylinder 19 to flow into the liquid outlet pipe 46.

[0035] When the present invention is used and buried in the soil, during rainy days or when washing saline-alkali land, there is a large amount of water in the saline-alkali land. Then, a large amount of salt in the saline-alkali land enters the drain pipe 2 through the through holes 4 of the blind pipe 3 along with the water and finally flows into the filtering cavity.

[0036] When the filter screen is blocked, the water flowing through the through holes 4 into the blind pipe 3 and the drain pipe 2 decreases. The output end of the electric push rod 9 is controlled by the controller to move downward, and then drives the movable plate 8 to move downward. The downward movement of the movable plate 8 drives the rack plate 20 to move downward. The downward movement of the rack plate 20 drives the gear 40 to rotate. The rotation of the gear 40 drives the shaft rod 35 to rotate. The rotation of the shaft rod 35 drives the driving screw 38 to rotate. Since the rectangular sleeve 36 cannot rotate under the L-shaped frame 22, the rectangular sleeve 36 moves and drives the mounting ring 23 and the sealing plug 37 to move. Finally, the sealing plug 37 extends into the drain pipe 2 to seal the drain pipe 2, so that the scouring water containing salt cannot be discharged. As the rack plate 20 drives the gear 40 to continue moving downward, the sealing plug 37 gradually extends into the drain pipe 2. The rotation of the driving screw 38 drives the rotating rod 49 to rotate. The rotation of the rotating rod 49 can wind up the pull rope 50. The winding of the pull rope 50 drives the connecting block 39 and the movable ring 41 to move downward. At this time, the spring 44 is stretched. Since there is negative pressure in the sealed space above the piston plate 51, the piston plate 51 moves a small distance and stops. After the output end of the electric push rod 9 stops moving, the solenoid valve 6 is opened at this time. Air enters the blind pipe 3 through the communication pipe 5. At this time, the position above the piston plate 51 is no longer in a negative pressure state. Under the pull of the spring 44, the piston plate 51 moves downward quickly, so as to squeeze the air or water in the blind pipe 3. Since the drain pipe 2 is blocked, the air and water are discharged through the through holes 4. In this way, the filter screen can be backblown and backwashed to prevent the filter screen from being blocked, so as to meet the requirement of rapid water passing and drainage.

[0037] Meanwhile, the drive of the coupling 34 drives the transmission rod 33 to rotate. The rotation of the transmission rod 33 causes the worm 32 to rotate rapidly through the gearbox 16. The worm 32 drives the worm wheel 31 to rotate, thereby causing the short shaft 25 and the semi-permeable membrane 10 to rotate (the rotation angle is 180°). The salt discharge pipe 2 is blocked, making the water above the movable plate 8 lower than the semi-permeable membrane 10. Therefore, when the semi-permeable membrane 10 rotates, unfiltered water will not enter the drainage cavity. In this way, it can be ensured that the water containing salt is filtered before being discharged.

[0038] The rotation of the shaft rod 35 drives the second transmission wheel 30 to rotate. Under the drive of the belt 29, the first transmission wheel 28 is driven to rotate, thereby realizing the rotation of the driven shaft 17. The rotation of the driven shaft 17 drives the first screw rod 14, the second screw rod 15 and the short rod 27 to rotate. Since the thread directions of the first screw rod 14 and the second screw rod 15 are opposite, when the first screw rod 14 and the second screw rod 15 rotate, the two movable frames 13 move relatively, and then drive the two sealing covers 11 to move relatively. Finally, the annular hollow rubber abuts against the baffle 7 and covers the outside of the semi-permeable membrane 10.

[0039] When the two sealing covers 11 abut against the baffle 7, the annular hollow rubber will be squeezed. In this way, the air between the two sealing covers 11 will be squeezed, and part of the air will be backflushed through the semi-permeable membrane 10, and the air is discharged through the liquid discharge pipe 26.

[0040] The rotation of the driven shaft 17 drives the reciprocating screw rod 18 to rotate rapidly. A guiding mechanism can be set for the threaded cylinder 43, such as a fixed telescopic rod, and the other end of the telescopic rod is fixed on the inner wall of the box body 1, etc., so that the threaded cylinder 43 cannot rotate. Therefore, when the reciprocating screw rod 18 rotates, the threaded cylinder 43 and the moving piston 42 can reciprocate. When the moving piston 42 moves close to the reciprocating screw rod 18, the water on the movable plate 8 can be sucked into the piston cylinder 19 through the liquid inlet pipe 45. When the moving piston 42 moves away from the reciprocating screw rod 18, the water can be discharged through the liquid outlet pipe 46 and conveyed into the sealing cover 11, and the water can backwash the semi-permeable membrane 10; When the movable plate 8 moves down and the amount of water extracted decreases and water cannot be extracted, air will be extracted. In this way, the semi-permeable membrane 10 can be blown with air, so as to clean the semi-permeable membrane 10. The air and clean water are discharged through the liquid discharge pipe 26, and a special collection box can be set.

[0041] After a period of time, the electric push rod 9 drives the movable plate 8 to reset. In this way, all parts can be reset, the salt discharge pipe 2 is no longer blocked, and the salt discharge and filtration work can be carried out normally.

[0042] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. An agricultural saline-alkali land improvement and salt removal device, comprising a housing (1), characterized in that: A baffle (7) is fixed in the box body (1), a semipermeable membrane (10) is movably mounted on the baffle (7), the baffle (7) divides the box body (1) into a drainage chamber and a filter chamber, a salt discharge pipe (2) is installed through the box body (1), a plurality of blind pipes (3) are installed on the salt discharge pipe (2), a plurality of through holes (4) are installed on the blind pipes (3), a filter screen is installed in the through holes (4), a movable plate (8) that can move up and down is slidably connected in the filter chamber, a rotating rod (49) driven by the movable plate (8) is rotatably mounted in the salt discharge pipe (2), and the rotating rod (49) is rotatably mounted in the salt discharge pipe (2), and the rotating rod (49) is rotatably mounted in the salt discharge pipe (2). A driving screw (38) is fixed on the blind tube (9), and a movable rod of the driving screw (38) is connected to a hollow sealing plug (37) capable of sealing the salt discharge pipe (2). A piston plate (51) located above the through hole (4) is slidably connected in the blind tube (3), and the piston plate (51) is connected to the rotating rod (49) through a delay mechanism. The movable plate (8) moves downward to drive the rotating rod (49) to rotate, and the rotation of the rotating rod (49) drives the driving screw (38) to rotate so that the sealing plug (37) seals the salt discharge pipe (2), and at the same time, the piston plate (51) moves downward to squeeze air so that the air blows back the filter screen.

2. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 1 is characterized in that: The baffle plate (7) is provided with a circular groove and a mounting groove (24) extending therethrough. A circular frame is rotatably mounted in the circular groove. The semipermeable membrane (10) is mounted in the circular frame. A short shaft (25) is fixedly connected to the upper end of the circular frame. The short shaft (25) extends through the baffle plate (7) and is rotatably connected thereto and extends into the mounting groove (24). A worm wheel (31) is mounted on the short shaft (25). A worm (32) is meshingly connected to the worm wheel (31). A mounting frame (21) is mounted in the housing (1). A gearbox (16) is mounted on the mounting frame (21). The worm (32) is fixedly connected to one shaft end of the gearbox (16). A transmission rod (33) capable of rotating with a rotating rod (49) is fixed to the other shaft end of the gearbox (16).

3. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 2 is characterized in that: A coupling (34) is mounted on the transmission rod (33), a shaft (35) is fixed on the coupling (34), a gear (40) is fixedly connected to the shaft (35), a rack plate (20) is meshingly connected to the gear (40), and the rack plate (20) is fixed on the movable plate (8).

4. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 3 is characterized in that: An electric push rod (9) is fixed to the inner bottom of the box body (1), and the output end of the electric push rod (9) is fixedly connected to the upper end of the movable plate (8).

5. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 1 is characterized in that: An L-shaped frame (22) is fixed inside the box body (1), a rectangular sleeve (36) slidably arranged is passed through the L-shaped frame (22), the rectangular sleeve (36) is sleeved on the outside of the driving screw (38) and is cooperatively connected thereto, a mounting ring (23) is fixed on the rectangular sleeve (36), and the sealing plug (37) is fixed on the mounting ring (23).

6. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 1 is characterized in that: The invention also comprises a cleaning mechanism capable of backwashing and cleaning the semipermeable membrane (10), the cleaning mechanism comprising a short rod (27) penetrating the baffle plate (7) and rotatably connected thereto, a first screw rod (14) and a second screw rod (15) being fixed to both ends of the short rod (27), a movable frame (13) located in the drainage chamber and the filter chamber being slidably connected in the housing (1), the first screw rod (14) and the second screw rod (15) respectively penetrating the movable frame (13) on the same side and being threadedly connected thereto, a sealing cover (11) capable of covering the outside of the semipermeable membrane (10) being fixed on the movable frame (13), and a drainage pipe (26) being installed at the bottom of the sealing cover (11) located in the drainage chamber.

7. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 6 is characterized in that: The thread directions of the first screw rod (14) and the second screw rod (15) are opposite, and a driven shaft (17) is fixed to the second screw rod (15), and the driven shaft (17) is connected to the shaft rod (35) via a transmission mechanism.

8. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 6 is characterized in that: The transmission mechanism comprises a first transmission wheel (28) fixed on a driven shaft (17), a second transmission wheel (30) fixed on the shaft (35), and the first transmission wheel (28) and the second transmission wheel (30) are connected via a belt (29).

9. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 6, characterized in that: The invention also comprises a booster mechanism for increasing the backwashing intensity of the semipermeable membrane (10), the booster mechanism comprising a piston cylinder (19) installed in the housing (1), a movable piston (42) being slidably connected in the piston cylinder (19), a threaded cylinder (43) being fixedly connected to the movable piston (42), a reciprocating screw (18) being threadedly connected in the threaded cylinder (43), the reciprocating screw (18) being fixedly connected to the driven shaft (17), a liquid inlet pipe (45) and a liquid outlet pipe (46) being installed at the bottom of the piston cylinder (19), the liquid outlet pipe (46) being connected to the sealing cover (11) in the filter chamber, a first one-way valve (47) being installed on the liquid inlet pipe (45), and a second one-way valve (48) being installed on the liquid outlet pipe (46).

10. The agricultural saline-alkali land improvement and salt drainage equipment according to claim 9, characterized in that: The plurality of blind tubes (3) are connected via a connecting tube (5), the connecting tube (5) is located above the piston plate (51), and a solenoid valve (6) is installed at the end of the connecting tube (5).

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