Circulating flushing equipment for saline-alkali soil remediation and remediation method thereof

Abstract

The invention provides circulating flushing equipment for saline-alkali soil remediation and a remediation method of the circulating flushing equipment. The circulating flushing equipment for saline-alkali soil remediation comprises a communicating pipe, a water collecting pipe, a collecting pipe, a water draining pipe, a water pumping vehicle, a water guiding groove and a water returning cylinder assembly. The collecting pipe is arranged between the water collecting pipe and the water discharging pipe, the water return cylinder assembly is placed at the collecting pipe through the lifting mechanism, the water return cylinder assembly detects return water while preventing the return water from being discharged into the water discharging pipe, and whether the return water meets the recycling standard or not is detected; the water return barrel assembly sends a water return pump meeting the reuse standard back into the water guide groove to flush the field again, efficient cyclic utilization of water resources is achieved, the water resource utilization rate is effectively increased, the water return barrel assembly detects return water all the time, whether cyclic cleaning of the field is completed or not is judged, and the problems of excessive flushing and insufficient flushing are avoided.

Description

Technical Field

[0001] This invention relates to the field of contaminated soil regeneration, specifically to a circulating flushing device and method for saline-alkali land remediation. Background Technology

[0002] Saline-alkali land is land affected by natural and human factors, resulting in salt accumulation and poor properties. It not only directly restricts agricultural production but also poses a threat to the ecological environment. Saline-alkali land flushing is a human intervention that transforms land that is high in salt and alkali and unsuitable for crop growth into fertile soil that can support the growth of healthy crops.

[0003] Irrigation and salt leaching is a traditional and important water conservancy project for managing saline soil. Its core principle is to irrigate with a large amount of water, allowing the water to infiltrate and dissolve excess soluble salts in the soil surface and crop root zone, leaching them into the deeper soil layers, or draining them out through a drainage system. The drainage system specifically includes underground pipes that collect the leached salt water and discharge it from the field, thus preventing secondary salinization.

[0004] Chinese Patent CN109417875A discloses a concealed pipe salt washing device and method. The device includes: a T-shaped tee; a concealed pipe connected to a side port of the T-shaped tee; a water outlet pipe connected to a lower port of the T-shaped tee; and a transparent vertical pipe detachably connected to the upper port of the T-shaped tee and with adjustable length, used to seal the water outlet pipe or the upper port of the T-shaped tee. This device is used to wash salt from saline-alkali land. The transparent vertical pipe allows for monitoring and control of the water level in the saline-alkali land; the sealing component allows for controllable immersion time of the saline-alkali soil in irrigation water.

[0005] Regarding the aforementioned technologies, irrigation for salt leaching requires injecting large amounts of fresh water into the fields to rinse the saline-alkali soil. However, given the varying salt content across different parts of the field, it is difficult to precisely control the amount of water and the time required for rinsing. The drainage collected infiltrating into the underground pipes may not reach saturation, easily leading to water waste or incomplete rinsing. Furthermore, traditional methods lack real-time monitoring and recycling mechanisms for the drainage after salt leaching, resulting in low treatment efficiency.

[0006] In summary, existing salt leaching technologies for saline-alkali land remediation still have prominent problems such as low water resource utilization, lack of precise control during the leaching process, and ineffective drainage recycling. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the purpose of this invention is to provide a circulating flushing device and a method for the remediation of saline-alkali land.

[0008] A circulating flushing device for saline-alkali land remediation according to the present invention includes: a connecting pipe, a water collection pipe, a manifold pipe, a drain pipe, a water pump truck, a water guide channel, and a return water cylinder assembly; The water collection pipe, the manifold pipe, and the drainage pipe are buried in the field. The water collection pipe and the drainage pipe are installed on both sides of the manifold pipe. The connecting pipe extends vertically from the surface of the field into the field and connects with the manifold pipe. The water collection pipe is installed directly below the water guide channel dug on the field. The water pump truck is used to pump water for saline-alkali land remediation into the water guide channel. The water pump truck is equipped with a lifting mechanism, which is connected to the return water cylinder assembly. The lifting mechanism is used to drive the return water cylinder assembly to move vertically within the connecting pipe. The outer wall of the return water cylinder assembly is in contact with the inner wall of the connecting pipe, and the return water cylinder assembly is used to send the return water from the water collection pipe to the water guide trough.

[0009] Preferably, the return water cylinder assembly includes a return water cylinder, a baffle plate, a submersible pump, a first interface, and a detection head; The return water cylinder has an inlet on its side wall; The submersible pump is installed inside the return water tank near the inlet. The detection head is installed on one side of the submersible pump; The baffle is disposed inside the return water cylinder, and the baffle isolates the water inlet, submersible pump, and detection head into a space; The first interface is located at the outlet end of the submersible pump, and the first interface extends upward through the partition. When the detection head detects that the returned water meets the reuse standard, the submersible pump pumps the returned water to the water guide channel. When the detection head detects that the returned water does not meet the reuse standard, the lifting mechanism drives the returned water cylinder assembly to move upward in the connecting pipe, and the returned water is discharged to the drain pipe. When the detection head detects that the return water meets the reuse standard within a set time, the lifting mechanism drives the return water cylinder assembly to move upward in the connecting pipe until it leaves the connecting pipe, and the return water is discharged to the drain pipe.

[0010] Preferably, the return water cylinder assembly further includes a telescopic column, a support plate, and a positioning frame; The central axis of the telescopic column is parallel to the central axis of the return water cylinder, and does not coincide with the central axis of the return water cylinder; The telescopic column includes a fixed part and a telescopic part. The fixed part is fixedly installed on the return water cylinder, and the telescopic part is slidably connected to the fixed part. The support plate is fixed to the fixed part of the telescopic column, and the top support point of the support plate is on the same straight line as the axis of the return water cylinder. The support plate is used to support the positioning frame. A top block is fixedly connected to the top of the telescopic part of the telescopic column, and the top block is slidably connected to the positioning frame. Specifically, when the telescopic part of the telescopic column is not extended, the positioning frame remains parallel and does not contact the inner wall of the connecting pipe; when the telescopic part of the telescopic column is extended, the positioning frame tilts and contacts the inner wall of the connecting pipe.

[0011] Preferably, the positioning frame includes a first positioning strip with a common midpoint and two second positioning strips, wherein the midpoint is on the same straight line as the axis of the return water cylinder; The top block, which is fixedly connected to the top of the telescopic column, is slidably connected to the first positioning strip. The first positioning strip has a first extension portion extending downward at its end, and the second positioning strip has a second extension portion extending upward at its end; The ends of the first extension and the second extension are respectively connected to friction columns.

[0012] Preferably, the first positioning strip has movable grooves on both sides, parallel to the top and bottom surfaces of the first positioning strip. The top block is fixedly connected to a sliding column located in the moving groove, and the sliding column can slide within the moving groove.

[0013] Preferably, the connecting pipe has two openings along the axial direction of the manifold, one opening being connected to the water collection pipe and the other opening being connected to the drain pipe; When the return water cylinder assembly moves to the bottom of the connecting pipe, the top of the return water cylinder in the return water cylinder assembly is higher than the opening, and a sealing ring is provided at the top of the return water cylinder. A sealing plate is fixedly connected between the outer wall of the connecting pipe and the inner wall of the manifold.

[0014] Preferably, the bottom end of the connecting pipe near the drain pipe is provided with a sand discharge port, and the bottom end of the sand discharge port is flush with the bottom surface of the return water cylinder.

[0015] Preferably, the lifting mechanism includes a cable and a winding reel; The winding reel is installed at the rear top of the water pump truck; One end of the cable is connected to the return water cylinder assembly, and the other end is connected to the take-up reel; The take-up reel is used to take up or release the cable.

[0016] Preferably, hollow tubes inserted into the ground are arranged at intervals along the length of the water guide channel, and water inlets are arranged at intervals along the axis of the tubes.

[0017] According to the present invention, a circulating flushing method for saline-alkali land remediation is provided, employing any one of the circulating flushing devices for saline-alkali land remediation described above, comprising: A connecting pipe, a water collection pipe, a confluence pipe, and a drainage pipe are buried in the field. The water collection pipe and the drainage pipe are installed on both sides of the confluence pipe. One end of the connecting pipe is connected to the confluence pipe, and the other end extends out of the field. The water pump truck moves to the vicinity of the position where the connecting pipe extends out of the field, and the lifting mechanism puts the return water cylinder assembly into the bottom of the connecting pipe along the axis of the connecting pipe; A water guide channel is dug on the surface of the field directly above the water collection pipe along the length of the water collection pipe. The water pump truck pumps saline-alkali land remediation water into the water guide channel. The saline-alkali land remediation water in the water guide channel seeps into the field to flush the field. The return water after flushing the field enters the water collection pipe. The return water collected by the water collection pipe flows to the manifold, and the return water cylinder assembly detects whether the return water meets the reuse standard; If the reuse criteria are met, the return water cylinder assembly will pump the return water to the water guide channel for reuse, and the return water circulation will wash the field. If the reuse standard is not met, the lifting mechanism will lift the return water cylinder assembly in the connecting pipe so that the return water is discharged into the drain pipe. When the return water cylinder assembly detects that the return water consistently meets the reuse standard within a set time period, it is determined that the field cleaning cycle in that area has been completed. The water pump truck then stops pumping water for saline-alkali land restoration, and the lifting mechanism retracts the return water cylinder assembly into the connecting pipe.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention involves installing a manifold between the water collection pipe and the drainage pipe, and using a lifting mechanism to place a return water cylinder assembly into the manifold. The return water cylinder assembly prevents return water from flowing into the drainage pipe while simultaneously detecting whether the return water meets reuse standards. The assembly then pumps the reused return water back into the water channel to rinse the field again, achieving efficient water recycling and effectively improving water resource utilization. The return water cylinder assembly continuously monitors the return water to determine if the field has been completely cleaned, avoiding both over-rinsing and under-rinsing. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the cyclic flushing of fields, which is the main feature of this invention. Figure 2 This is a schematic diagram illustrating the pipeline burial status within the field, which is the main feature of this invention. Figure 3 This invention is mainly embodied in Figure 2 Enlarged view of A in the middle; Figure 4 This invention mainly illustrates the connection state of the manifold, connecting pipe, and water collection pipe in a three-dimensional view. Figure 5 This invention primarily illustrates the three-dimensional view of the internal structure of the manifold and connecting pipe; Figure 6 This invention is mainly embodied in Figure 5 Enlarged view of B in the middle; Figure 7 This invention mainly illustrates a three-dimensional view of the manifold and connecting pipe; Figure 8 This invention is mainly illustrated by a three-dimensional view of the manifold and connecting pipe from another perspective; Figure 9 This is a perspective view showing the contact state between the positioning frame and the inner wall of the connecting pipe, which is the main feature of this invention. Figure 10 This invention is mainly embodied in Figure 9 Enlarged view of C; Figure 11 This is a front view showing the contact state between the positioning frame and the inner wall of the connecting pipe, which is the main feature of this invention. Figure 12 This invention primarily illustrates a three-dimensional view of the return water cylinder when the positioning frame is in a horizontal state; Figure 13 This invention primarily demonstrates a three-dimensional view of the return water cylinder when the positioning frame is in a horizontal state from another perspective.

[0020] The diagram shows: 1. Return water cylinder; 101. Inlet; 102. Sealing ring; 2. Partition plate; 3. Submersible pump; 4. First interface; 5. Detection head; 6. Telescopic column; 601. Top block; 7. Support plate; 8. Positioning frame; 801. First extension; 802. Second extension; 803. Friction column; 804. Moving groove; 9. Cable; 10. Manifold; 1001. Sealing plate; 11. Connecting pipe; 1101. Through port; 1102. Sand discharge port; 12. Water collection pipe; 13. Drainage pipe; 14. Pump truck; 15. Reel; 16. Second interface; 17. Third interface; 18. Field; 19. Water guide channel; 20. Insertion pipe; 21. Cover. Detailed Implementation

[0021] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0022] like Figures 1 to 3 As shown, a circulating flushing device for saline-alkali land remediation according to the present invention includes: a connecting pipe 11, a water collection pipe 12, a manifold pipe 10, a drain pipe 13, a water pump 14, a water guide trough 19, and a return water cylinder assembly.

[0023] The water collection pipe 12, the manifold pipe 10, and the drain pipe 13 form a concealed drainage pipe. The manifold pipe 10 and the drain pipe 13 are connected by a flange. The water collection pipe 12 is inserted into the manifold pipe 10 for connection. The water collection pipe 12, the manifold pipe 10, and the drain pipe 13 are buried in the field 18. The water collection pipe 12 and the drain pipe 13 are installed on both sides of the manifold pipe 10. Specifically, as shown... Figure 4 as well as Figure 5 As shown, the water collection pipe 12 includes three parallel and equidistant branch pipes. The connecting pipe 11 extends vertically from the surface of the field 18 into the field 18 and connects to the manifold 10. The water collection pipe 12 is installed directly below the water guide channel 19 dug in the field 18, with the water collection pipe 12 directly below the water guide channel 19. Water used for saline-alkali land remediation flows from the water guide channel 19 through the field 18 and then returns to the water collection pipe 12 for collection. The end of the water collection pipe 12 closest to the manifold 10 is lower than the other end, allowing water entering the water collection pipe 12 to flow towards the manifold 10 more quickly due to its own gravity.

[0024] like Figure 1 As shown, in one feasible embodiment, the top of the connecting pipe 11 is covered with a cap 21 when not in use, which prevents debris from falling into the connecting pipe 11. In another feasible embodiment, the end of the drain pipe 13 is connected to a water storage tank, and the saline water in the water storage tank is periodically pumped out and transferred for treatment to prevent the saline water from being directly discharged and polluting the land in other areas.

[0025] The carriage of the water pump truck 14 is used to hold water for saline-alkali land remediation. The water pump truck 14 is used to pump water for saline-alkali land remediation into the guide water tank 19. The water pump truck 14 is equipped with a lifting mechanism, which is connected to the return water cylinder assembly. The lifting mechanism is used to drive the return water cylinder assembly to move vertically within the connecting pipe 11.

[0026] In one feasible implementation, a bracket for fixing the return water cylinder assembly is welded to the rear end of the water pump truck 14, which keeps the water pump truck 14 stable when it moves with the return water cylinder assembly.

[0027] The lifting mechanism and the return water cylinder assembly are integrated into one unit. After the field 18 in one area is flushed, the pump truck 14 can move together with the lifting mechanism and the return water cylinder assembly to the field 18 in the next area to perform cyclic flushing of the field 18 in the next area.

[0028] The outer wall of the return water cylinder assembly is in contact with the inner wall of the connecting pipe 11. The return water cylinder assembly is used to send the return water from the collection pipe 12 to the guide channel 19. When the return water meets the reuse standard, the lifting mechanism places the return water cylinder assembly at the bottom of the manifold 10. The return water cylinder assembly prevents the return water from flowing into the drain pipe 13 and sends the return water from the collection pipe 12 to the guide channel 19. When the return water does not meet the reuse standard, the lifting mechanism lifts the return water cylinder assembly in the connecting pipe 11, and the return water flows into the drain pipe 13. When the return water meets the reuse standard for a set time, the lifting mechanism lifts the return water cylinder assembly in the connecting pipe 11 until it leaves the connecting pipe 11, completing the flushing of this field 18. The water pump truck 14 drives the return water cylinder assembly to move to the next field 18 to flush the next field 18.

[0029] A connecting pipe 11, a water collection pipe 12, a confluence pipe 10, and a drainage pipe 13 are buried in field 18. The water collection pipe 12 and the drainage pipe 13 are installed on both sides of the confluence pipe 10. One end of the connecting pipe 11 is connected to the confluence pipe 10, and the other end extends out of the ground.

[0030] The pump truck 14 moves to the vicinity of the position where the connecting pipe 11 extends out of the ground, and the lifting mechanism puts the return water cylinder assembly into the bottom of the connecting pipe 11 along the axis of the connecting pipe 11.

[0031] A water guide channel 19 is dug on the surface of the field 18 directly above the water collection pipe 12 along the length of the water collection pipe 12. The water pump truck 14 pumps water for saline-alkali land restoration into the water guide channel 19. The water for saline-alkali land restoration in the water guide channel 19 seeps into the field 18 to flush the field 18. The return water after flushing the field 18 enters the water collection pipe 12.

[0032] The return water collected by the collection pipe 12 flows to the manifold 10. The return water cylinder assembly detects whether the return water meets the reuse standard. If it does, the return water cylinder assembly pumps the return water to the guide channel 19 for reuse, and the return water circulation washes the field 18. If it does not meet the reuse standard, the lifting mechanism lifts the return water cylinder assembly in the connecting pipe 11, so that the return water enters the drain pipe 13.

[0033] When the return water cylinder assembly detects that the return water consistently meets the reuse standard within the set time period, it is determined that the field 18 in that area has been cleaned in a cycle. The water pump truck 14 stops pumping water for saline-alkali land restoration, and the lifting mechanism retracts the return water cylinder assembly into the connecting pipe 11 and moves it to the connecting pipe 11 of the next field 18 that is equipped with the connecting pipe 11, water collection pipe 12, manifold pipe 10, and drainage pipe 13. The field 18 corresponding to the connecting pipe 11 is then flushed in a cycle.

[0034] This invention sets up a manifold 10 between the water collection pipe 12 and the drainage pipe 13, and uses a lifting mechanism to place the return water cylinder assembly into the manifold 10. The return water cylinder assembly prevents the return water from flowing into the drainage pipe 13 while detecting the return water to see if it meets the reuse standard. The return water cylinder assembly pumps the return water that meets the reuse standard back into the water guide channel 19 to rinse the field again, realizing the efficient recycling of water resources and effectively improving the water resource utilization rate. The return water cylinder assembly continuously detects the return water to determine whether the field 18 has been circulated and cleaned completely, avoiding the problems of over-rinsing and under-rinsing.

[0035] like Figure 12 As shown, in some feasible embodiments, the return water cylinder assembly includes a return water cylinder 1, a baffle 2, a submersible pump 3, a first interface 4, and a detection head 5.

[0036] The outer diameter of the return water cylinder 1 is the same as the inner diameter of the connecting pipe 11. An inlet 101 is provided on the side wall of the return water cylinder 1. The submersible pump 3 is located inside the return water cylinder 1 near the inlet 101. The detection head 5 is installed on one side of the submersible pump 3. A partition 2 is located inside the return water cylinder 1, isolating the inlet 101, submersible pump 3, and detection head 5 into a single space. Because the partition 2 isolates the inlet 101, submersible pump 3, and detection head 5 into a single space, the return water only enters this area of ​​the return water cylinder 1 and does not enter other areas of the return water cylinder 1, thus avoiding any impact on the components installed in other areas of the return water cylinder 1. A first interface 4 is located at the outlet end of the submersible pump 3. The first interface 4 passes upward through the partition 2, isolating the inlet 101, submersible pump 3, and detection head 5 into a single space, allowing the return water to pass through the partition 2 and be pumped outwards.

[0037] Specifically, the rear of the water pump truck 14 is equipped with a second interface 16 and a third interface 17. A water pump is installed inside the water pump truck 14. The inlet of the water pump is connected to the water tank of the water pump truck 14, and the outlet of the water pump is connected to the third interface 17. A hose connected to the third interface is used to guide water into the water guide channel 19. The second interface 16 is connected to the first interface 4 via a hose, allowing the return water pumped by the submersible pump 3 to be transported into the water tank of the water pump truck 14 through the hose, thereby achieving water resource reuse. In a feasible embodiment, the return water pumped by the submersible pump 3 can also be directly discharged into the water guide channel 19, thereby preventing the salt content of the water in the water storage tank of the water pump truck 14 from increasing.

[0038] Specifically, when the detection head 5 detects that the returned water meets the reuse standard, the submersible pump 3 pumps the returned water to the guide tank 19; when the detection head 5 detects that the returned water does not meet the reuse standard, the lifting mechanism drives the returned water cylinder assembly to move upward within the connecting pipe 11, and the returned water is discharged to the drain pipe 13; when the detection head 5 detects that the returned water meets the reuse standard for a set time, the lifting mechanism drives the returned water cylinder assembly to move upward within the connecting pipe 11 until it leaves the connecting pipe 11, and the returned water is discharged to the drain pipe 13. Specifically, the detection head 5 is a conductivity sensor; it detects whether the returned water meets the reuse standard by detecting the salt concentration in the returned water. Return water is collected by the collecting pipe 12 and flows to the manifold 10. The return water cylinder 1 in the manifold 10 prevents the return water from flowing into the drain pipe 13. The return water enters the return water cylinder 1 through the inlet 101, and the detection head 5 detects the return water. When the detection head 5 detects that the return water meets the reuse standard, the return water entering the return water cylinder 1 through the inlet 101 is pumped by the submersible pump 3, and the return water is sent from the first interface 4 to the guide trough 19. When the detection head 5 detects that the return water does not meet the reuse standard, the lifting mechanism drives the return water cylinder assembly to move upward within the connecting pipe 11, and the return water is discharged to the drain pipe 13. When the detection head 5 detects that the return water meets the reuse standard for a set time, the lifting mechanism drives the return water cylinder assembly to move upward within the connecting pipe 11 until it leaves the connecting pipe 11, and the return water is discharged to the drain pipe 13.

[0039] like Figure 6 As shown, in some feasible embodiments, the return water cylinder assembly also includes a telescopic column 6, a support plate 7, and a positioning frame 8.

[0040] The central axis of the telescopic column 6 is parallel to the central axis of the return water cylinder 1 and does not coincide with the central axis of the return water cylinder 1. The telescopic column 6 includes a fixed part and a telescopic part. The fixed part is fixedly installed on the return water cylinder 1, and the telescopic part is slidably connected to the fixed part. Specifically, the telescopic column 6 adopts an electric push rod. The support plate 7 is fixed on the fixed part of the telescopic column 6. The top support point of the support plate 7 is on the same straight line as the axis of the return water cylinder 1. The support plate 7 is used to support the positioning frame 8. The top of the telescopic part of the telescopic column 6 is fixedly connected to a top block 601, and the top block 601 is slidably connected to the positioning frame 8. When the telescopic part of the telescopic column 6 is not extended, the top support point of the support plate 7 is in the same straight line as the axis of the return water cylinder 1, and the top support point of the support plate 7 is in contact with the top of the positioning frame 8 to support the positioning frame 8. The positioning frame 8 remains parallel and does not contact the inner wall of the connecting pipe 11. When the telescopic part of the telescopic column 6 is extended, the telescopic column 6 is not located at the central axis of the return water cylinder 1. When the bottom of the positioning frame 8 is only in contact with the telescopic column 6, the positioning frame 8 tilts under its own weight and contacts the inner wall of the connecting pipe 11.

[0041] The lifting mechanism lowers the return water cylinder assembly into the connecting pipe 11. The return water cylinder assembly descends slowly under its own weight. The top support point of the support plate 7 contacts the top of the positioning frame 8, supporting the positioning frame 8. The positioning frame 8 remains parallel, but it does not fully contact the inner wall of the connecting pipe 11. As the friction between the sealing ring 102 on the return water cylinder 1 and the inner wall of the connecting pipe 11 gradually increases until the return water cylinder assembly can no longer descend under its own weight, the telescopic part of the telescopic column 6 extends, lifting the positioning frame 8 and causing it to detach. Upon contact with the support plate 7, the positioning frame 8 tilts under its own weight, and its edge contacts the inner wall of the connecting pipe 11. As the telescopic column 6 continues to extend, the force exerted by the telescopic column 6 on the positioning frame 8 is positioned slightly above the tilted frame 8, further intensifying the tilt and compressing the edge of the positioning frame 8. The friction between the positioning frame 8 and the inner wall of the connecting pipe 11 is sufficient, thus fixing the height of the positioning frame 8 within the connecting pipe 11. As the telescopic column 6 continues to extend, the return water cylinder 1 can be easily pushed downwards. This reciprocating extension and retraction of the telescopic column 6 stably pushes the return water cylinder 1 to the bottom of the connecting pipe 11.

[0042] When the return water cylinder 1 can no longer slide down under its own weight, the telescopic column 6 can provide a downward thrust for the return water cylinder 1. At the same time, when the telescopic column 6 retracts, it will not affect the normal rise of the return water cylinder 1, ensuring that the return water cylinder 1 can be smoothly lowered to the bottom of the connecting pipe 11. At the same time, when it is necessary to release return water to the drain pipe 13, it can be steadily raised by the lifting mechanism.

[0043] like Figures 6 to 13 As shown, in some feasible embodiments, the positioning frame 8 includes a first positioning strip with a common midpoint and two second positioning strips, the midpoint being on the same straight line as the axis of the return water cylinder 1, and the positioning frame 8 having an overall Y-shaped structure.

[0044] The top block 601, which is fixedly connected to the top of the telescopic column 6, is slidably connected to the first positioning strip.

[0045] The first positioning strip has a first extension 801 extending downward from its end, and the second positioning strip has a second extension 802 extending upward from its end.

[0046] Friction pins 803 are respectively connected to the ends of the first extension 801 and the second extension 802. When the positioning frame 8 is in a horizontal state, the friction pins 803 do not simultaneously contact the inner wall of the connecting pipe 11.

[0047] Specifically, the friction post 803 is made of rubber, and the rubber friction post 803 is bonded or snapped to the ends of the first extension 801 and the second extension 802 to achieve a stable connection.

[0048] The lifting mechanism places the return water cylinder assembly into the connecting pipe 11. The return water cylinder assembly descends slowly under its own weight. The top support point of the support plate 7 contacts the midpoints of the first positioning strip and the two second positioning strips, supporting the positioning frame 8. The positioning frame 8 remains parallel. The friction column 803 does not simultaneously contact the inner wall of the connecting pipe 11. As the friction between the sealing ring 102 on the return water cylinder 1 and the inner wall of the connecting pipe 11 gradually increases until the return water cylinder assembly can no longer descend under its own weight, the telescopic part of the telescopic column 6 extends, lifting the positioning frame 8 and causing it to disengage from the support plate 7. The positioning frame 8 tilts under its own weight, and the first extension 801 and the second extension 802... The friction column 803 connected at the end simultaneously contacts the inner wall of the connecting pipe 11. As the telescopic column 6 continues to extend, since the force applied by the telescopic column 6 to the positioning frame 8 is at the position of the first positioning strip, the tilting state of the first positioning strip upward and the second positioning strip downward will be further intensified. This causes the friction column 803 at the ends of the first extension 801 and the second extension 802 to be further compressed, further increasing the deformation of the friction column 803. This increases the contact area between the friction column 803 and the inner wall of the connecting pipe 11, while also increasing the force on the friction column 803 during contact. The friction between the positioning frame 8 and the inner wall of the connecting pipe 11 is sufficient, thus fixing the height of the positioning frame 8 within the connecting pipe 11. As the telescopic column 6 continues to extend, the return water cylinder 1 can be easily pushed downward. The telescopic column 6's telescopic extension and retraction in this way can stably push the return water cylinder 1 to the bottom of the connecting pipe 11.

[0049] like Figure 10As shown, in some feasible embodiments, the first positioning strip is provided with moving grooves 804 parallel to the top and bottom surfaces of the first positioning strip on both sides, and the top block 601 is fixedly connected to a sliding column located in the moving groove 804, which can slide in the moving groove 804.

[0050] Specifically, the top block 601 includes a bottom plate and two side plates. The bottom surface of the bottom plate is fixedly connected to the top of the telescopic column 6. The diameter of the sliding column is the same as the height of the moving groove 804. The two side plates are fixedly connected to one end of the sliding column, and the other end of the sliding column slides in the moving groove 804.

[0051] The sliding column slides within the moving groove 804, enabling the top block 601 to support the positioning frame 8 at different positions, thereby allowing the positioning frame 8 to tilt further.

[0052] like Figure 7 as well as Figure 8 As shown, in some feasible embodiments, the connecting pipe 11 is inserted into the manifold 10, with one end of the connecting pipe 11 in contact with the bottom surface of the manifold 10 and the other end extending outside the field 18.

[0053] The connecting pipe 11 is provided with two ports 1101 along the axial direction of the manifold; one port 1101 is connected to the water collection pipe 12, and the other port 1101 is connected to the drain pipe 13.

[0054] When the return water cylinder assembly moves to the bottom of the connecting pipe 11, the top of the return water cylinder 1 in the return water cylinder assembly is higher than the opening 1101, and a sealing ring 102 is provided at the top of the return water cylinder 1. The top of the return water cylinder 1 is higher than the opening 1101, the water inlet 101 on the return water cylinder 1 is connected to the opening 1101, and the sealing ring 102 is in close contact with the inner wall of the connecting pipe 11 to prevent drainage from flowing into the other side of the inner partition 2 of the return water cylinder 1, thereby avoiding water damage to components such as the telescopic column 6.

[0055] A sealing plate 1001 is fixedly connected between the outer wall of the connecting pipe 11 and the inner wall of the manifold 10. The sealing plate 1001 is used to prevent drainage from flowing directly out from the gap between the inner wall of the manifold 10 and the outer wall of the connecting pipe 11, so that the return water can be pumped back to the water guide tank 19 for reuse as much as possible after the test.

[0056] like Figure 7 as well as Figure 8As shown, in some feasible embodiments, a sand discharge port 1102 is provided at the bottom end of the inlet 1101 near the drain pipe 13 of the connecting pipe 11, and the bottom end of the sand discharge port 1102 is flush with the bottom surface of the return water cylinder 1. When the return water cylinder 1 rises, small particles or silt in the drainage are not effectively blocked by the water flow. The small particles or silt can follow the drainage and leave the connecting pipe 11 through the sand discharge port 1102. Therefore, it can prevent small particles or silt from accumulating at the bottom end of the connecting pipe 11, and avoid the bottom surface of the return water cylinder 1 not being able to contact the bottom end of the connecting pipe 11, which would cause the inlet 1101 and the inlet 101 to not be fully aligned.

[0057] like Figure 3 As shown, in some feasible embodiments, the lifting mechanism includes a cable 9 and a winding reel 15; the winding reel 15 is installed at the rear top of the pump truck 14; one end of the cable 9 is connected to the return water cylinder assembly, and the other end is connected to the winding reel 15; the winding reel 15 is used to wind up or unwind the cable 9.

[0058] Specifically, the top of the return water cylinder 1 is provided with four lugs for connecting the cable, and the rear top of the pump truck 14 is equipped with a winding reel 15 for winding or unwinding the cable. The winding reel 15 is used to wind the cable 9 to raise the height of the return water cylinder 1, and the winding reel 15 is used to unwind the cable 9 to insert the return water cylinder 1 into the connecting pipe 11.

[0059] In one feasible implementation, as the telescopic column 6 pushes the return water cylinder 1 downward, the winding reel 15 continuously rotates to release the cable 9, preventing the cable 9 from breaking or getting stuck due to excessive tension. When the telescopic column 6 retracts, although the positioning frame 8 is also in an inclined state, the contact force between the friction column 803 and the inner wall of the connecting pipe 11 is small and will not affect the retraction and reset of the telescopic column 6.

[0060] like Figure 2 As shown, in some feasible embodiments, hollow pipes 20 inserted into the ground are spaced along the length of the water channel 19. Each pipe 20 has permeable openings spaced along its axis, and its outer wall is covered with a permeable coating layer to prevent soil from entering the pipe. The pipes 20 allow the saline-alkali land remediation water in the water channel 19 to infiltrate more quickly. The permeable openings on the side walls of the pipes 20 allow water to seep evenly and rapidly into soil layers at different depths, effectively improving the infiltration efficiency of the saline-alkali land remediation water and enabling the saline-alkali land remediation water to quickly flush the field 18.

[0061] Specifically, the insertion tube 20 is inserted vertically into the water guide trough 19, and the bottom end of each insertion tube 20 maintains the same safe distance from the water collection pipe 12 to prevent the insertion tube 20 from breaking the water collection pipe 12.

[0062] Specifically, the insertion tube 20 can also be inserted into the water channel 19 at an angle, with the direction of the insertion tube 20 being the extension direction of the water channel 19. Inserting the insertion tube 20 at an angle into the water channel 19 further increases the speed of water delivery to the field 18.

[0063] According to the present invention, a circulating flushing method for saline-alkali land remediation includes: burying a connecting pipe 11, a water collection pipe 12, a confluence pipe 10, and a drainage pipe 13 in a field 18. The water collection pipe 12 and the drainage pipe 13 are installed on both sides of the confluence pipe 10. The connecting pipe 11 is kept vertical. One end of the connecting pipe 11 is connected to the confluence pipe 10, and the other end extends out of the ground.

[0064] The pump truck 14 moves to the vicinity of the position where the connecting pipe 11 extends out of the ground. After opening the cover 21, the first interface 4 and the second interface 16 are connected using a water supply hose. The bottom of the return water cylinder 1 is aligned with the connecting pipe 11, and the inlet 101 is oriented towards the opening 1101 on the side near the collecting pipe 12. The reel 15 slowly releases the cable, and the return water cylinder 1 slowly descends along the axis of the connecting pipe 11. As the friction between the sealing ring 102 and the inner wall of the connecting pipe 11 gradually increases until the return water cylinder 1 can no longer slide down by its own weight due to friction, the telescopic part of the telescopic column 6 extends, lifting the positioning frame 8 and causing the positioning frame 8 to disengage from the support plate 7. The positioning frame 8 then falls under its own weight. When the action is tilted, the friction pins 803 at the ends of the first extension 801 and the second extension 802 simultaneously come into contact with the inner wall of the connecting pipe 11. As the telescopic pin 6 continues to extend, since the position where the telescopic pin 6 applies force to the positioning frame 8 is at a position slightly above the tilted positioning frame 8, the tilting state of the positioning frame 8 will be further aggravated, causing the friction pins 803 to be further compressed, thereby fixing the height of the positioning frame 8 inside the connecting pipe 11. As the telescopic pin 6 continues to extend, the return water cylinder 1 can be easily pushed downward. The telescopic pin 6 can push the return water cylinder 1 stably to the bottom of the connecting pipe 11 by repeatedly extending and retracting, thereby achieving the stable placement of the connecting pipe 11. A water guide channel 19 is dug on the surface of the field 18 directly above the water collection pipe 12 along the length of the water collection pipe 12. The inclination direction of the water guide channel 19 is opposite to that of the water collection pipe 12. The height of the end of the water guide channel 19 near the connecting pipe 11 is higher than that of the other end, so that the water pumped by the water pump truck 14 for saline-alkali land restoration can flow more quickly and evenly into the water guide channel 19.

[0065] The water pump in the water pump truck 14 pumps the saline-alkali land restoration water in the water tank into the water guide channel 19 through the hose connected to the third interface 17. The saline-alkali land restoration water seeps into the water collection pipe 12. Affected by the inclined water collection pipe 12, the water flows into the manifold 10 under the action of gravity. When the water level is above the detection head 5, the detection head 5 can determine whether the drainage can be reused by measuring the liquid conductivity. The return water collected by the collection pipe 12 flows to the manifold 10. The detection head 5 checks whether the return water meets the reuse standard. If it does, the submersible pump 3 starts and pumps the return water to the guide channel 19 for reuse. The return water circulates to rinse the field 18. If it does not meet the reuse standard, the winding reel 15 winds up the cable 9 and lifts the return water cylinder assembly inside the connecting pipe 11, leaving a channel between the bottom of the return water cylinder 1 and the inner wall of the connecting pipe 11 for unusable drainage to pass through, allowing the return water to enter the drain pipe 13.

[0066] When the return water cylinder assembly detects that the return water consistently meets the reuse standard within the set time period, it is determined that the field 18 in that area has been cleaned in a cycle. The water pump truck 14 stops pumping water for saline-alkali land restoration, and the lifting mechanism retracts the return water cylinder assembly into the connecting pipe 11 and moves it to the connecting pipe 11 of the next field 18 that is equipped with the connecting pipe 11, water collection pipe 12, manifold pipe 10, and drainage pipe 13. The field 18 corresponding to the connecting pipe 11 is then flushed in a cycle.

[0067] After the return water cylinder 1 in the connecting pipe 11 is retracted, the field area 18 corresponding to the next connecting pipe 11 can be circulated and flushed, so as to regenerate the target field evenly and efficiently.

[0068] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0069] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A circulating flushing device for saline-alkali land remediation, characterized in that, include: Connecting pipe (11), collecting pipe (12), manifold (10), drain pipe (13), pump truck (14), water guide channel (19), and return water cylinder assembly; The water collection pipe (12), the confluence pipe (10) and the drainage pipe (13) are buried in the field. The water collection pipe (12) and the drainage pipe (13) are installed on both sides of the confluence pipe (10). The connecting pipe (11) extends vertically from the surface of the field to the field and connects with the confluence pipe (10). The water collection pipe (12) is installed directly below the water guide channel (19) dug on the field. The pump truck (14) is used to pump water for saline-alkali land restoration into the water guide channel (19). The pump truck (14) is equipped with a lifting mechanism, which is connected to the return water cylinder assembly. The lifting mechanism is used to drive the return water cylinder assembly to move vertically in the connecting pipe (11). The outer wall of the return water cylinder assembly is attached to the inner wall of the connecting pipe (11), and the return water cylinder assembly is used to send the return water from the water collection pipe (12) to the water guide trough (19).

2. The circulating flushing equipment for saline-alkali land remediation as described in claim 1, characterized in that, The return water cylinder assembly includes a return water cylinder (1), a partition (2), a submersible pump (3), a first interface (4), and a detection head (5); The return water cylinder (1) has an inlet (101) on its side wall. The submersible pump (3) is located inside the return water tank (1) near the inlet (101); The detection head (5) is installed on one side of the submersible pump (3); The partition (2) is disposed inside the return water cylinder (1), and the partition (2) isolates the water inlet (101), the submersible pump (3), and the detection head (5) into a space; The first interface (4) is located at the outlet end of the submersible pump (3), and the first interface (4) passes upward through the partition (2). When the detection head (5) detects that the return water meets the reuse standard, the submersible pump (3) pumps the return water to the water guide tank (19). When the detection head (5) detects that the return water does not meet the reuse standard, the lifting mechanism drives the return water cylinder assembly to move upward in the connecting pipe (11), and the return water is discharged to the drain pipe (13). When the detection head (5) detects that the return water meets the reuse standard within a set time, the lifting mechanism drives the return water cylinder assembly to move upward in the connecting pipe (11) until it leaves the connecting pipe (11), and the return water is discharged to the drain pipe (13).

3. The circulating flushing equipment for saline-alkali land remediation as described in claim 2, characterized in that, The return water cylinder assembly also includes a telescopic column (6), a support plate (7), and a positioning frame (8); The central axis of the telescopic column (6) is parallel to the central axis of the return water cylinder (1) and does not coincide with the central axis of the return water cylinder (1); The telescopic column (6) includes a fixed part and a telescopic part. The fixed part is fixedly installed on the return water cylinder (1), and the telescopic part is slidably connected to the fixed part. The support plate (7) is fixed to the fixed part of the telescopic column (6). The top support point of the support plate (7) is in the same straight line as the axis of the return water cylinder (1). The support plate (7) is used to support the positioning frame (8). The top end of the telescopic part of the telescopic column (6) is fixedly connected to a top block (601), and the top block (601) is slidably connected to the positioning frame (8). When the telescopic part of the telescopic column (6) is not extended, the positioning frame (8) remains parallel and does not contact the inner wall of the connecting pipe (11); when the telescopic part of the telescopic column (6) is extended, the positioning frame (8) tilts and contacts the inner wall of the connecting pipe (11).

4. The circulating flushing equipment for saline-alkali land remediation as described in claim 3, characterized in that, The positioning frame (8) includes a first positioning strip with a common midpoint and two second positioning strips, the midpoint being on the same straight line as the axis of the return water cylinder (1); The top block (601) fixedly connected to the top of the telescopic column (6) is slidably connected to the first positioning strip. The first positioning strip has a first extension portion (801) extending downward from its end, and the second positioning strip has a second extension portion (802) extending upward from its end. The ends of the first extension (801) and the second extension (802) are respectively connected to friction posts (803).

5. The circulating flushing equipment for saline-alkali land remediation as described in claim 4, characterized in that, The first positioning strip has movable grooves (804) on both sides, which are parallel to the top and bottom surfaces of the first positioning strip. The top block (601) is fixedly connected to a sliding column located in the moving groove (804), and the sliding column can slide in the moving groove (804).

6. The circulating flushing equipment for saline-alkali land remediation as described in claim 1, characterized in that, The connecting pipe (11) has two openings (1101) along the axial direction of the manifold (10). One opening (1101) is connected to the water collection pipe (12), and the other opening (1101) is connected to the drain pipe (13). When the return water cylinder assembly moves to the bottom of the connecting pipe (11), the top of the return water cylinder (1) in the return water cylinder assembly is higher than the opening (1101), and a sealing ring (102) is provided at the top of the return water cylinder (1). A sealing plate (1001) is fixedly connected between the outer wall of the connecting pipe (11) and the inner wall of the manifold (10).

7. The circulating flushing equipment for saline-alkali land remediation as described in claim 6, characterized in that, The bottom end of the opening (1101) of the connecting pipe (11) near the drain pipe (13) is provided with a sand discharge port (1102), and the bottom end of the sand discharge port (1102) is flush with the bottom surface of the return water cylinder (1).

8. The circulating flushing equipment for saline-alkali land remediation as described in claim 1, characterized in that, The lifting mechanism includes a cable (9) and a winding reel (15); The winding reel (15) is installed at the top of the rear of the water pump truck (14); One end of the cable (9) is connected to the return water cylinder assembly, and the other end is connected to the winding reel (15); The winding reel (15) is used to wind up or unwind the cable (9).

9. The circulating flushing equipment for saline-alkali land remediation as described in claim 1, characterized in that, The water channel (19) is provided with hollow tubes (20) inserted into the ground at intervals along its length direction, and the tubes (20) are provided with water inlets at intervals along their own axis.

10. A circulating flushing method for saline-alkali land remediation, characterized in that, The circulating flushing equipment for saline-alkali land remediation according to any one of claims 1 to 9 comprises: A connecting pipe (11), a water collection pipe (12), a confluence pipe (10), and a drainage pipe (13) are buried in the field (18). The water collection pipe (12) and the drainage pipe (13) are installed on both sides of the confluence pipe (10). One end of the connecting pipe (11) is connected to the confluence pipe (10), and the other end extends out of the field (18). The pump truck (14) moves to the vicinity of the position where the connecting pipe (11) extends out of the field (18), and the lifting mechanism puts the return water cylinder assembly into the bottom of the connecting pipe (11) along the axis of the connecting pipe (11); A water guide channel (19) is dug on the surface of the field (18) directly above the water collection pipe (12) along the length of the water collection pipe (12). The water pump truck (14) pumps saline-alkali land remediation water into the water guide channel (19). The saline-alkali land remediation water in the water guide channel (19) seeps into the field (18) to flush the field (18). The return water after flushing the field (18) enters the water collection pipe (12). The return water collected by the water collection pipe (12) flows to the manifold (10), and the return water cylinder assembly detects whether the return water meets the reuse standard; If the reuse standard is met, the return water cylinder assembly will pump the return water to the water guide channel (19) for reuse, and the return water circulation will rinse the field (18); If the reuse standard is not met, the lifting mechanism will lift the return water cylinder assembly in the connecting pipe (11) so that the return water is discharged into the drain pipe (13). When the return water cylinder assembly detects that the return water consistently meets the reuse standard within a set time period, it is determined that the field (18) in the area has been cleaned in a cycle. The water pump truck (14) stops pumping water for saline-alkali land restoration, and the lifting mechanism retracts the return water cylinder assembly into the connecting pipe (11).

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