An irrigation water filtration device

Abstract

The utility model relates to sandstone filter technical field discloses an irrigation water filtering device, including filter jar, the upper end fixed mounting of filter jar has upper connector, the lower end fixed mounting of filter jar has lower connector, one end fixed mounting has first three -way pipe of upper connector, one end fixed mounting has second three -way pipe of lower connector, the main pipe one end fixed mounting has first water inlet valve of first three -way pipe, the other end fixed mounting has blowdown valve, the main pipe one end fixed mounting has second water inlet valve of second three -way pipe. Blowdown valve, first water inlet valve, second water inlet valve and clean water valve form rigid motion chain, hand -self -executive organ only drive blowdown valve, can pass through the sequential drive of first crank, first connecting rod, third crank, second crank, third connecting rod, fifth crank, sixth crank, second connecting rod and fourth crank, synchronous completion four valve's open -close action, thereby will many step operation simplify as single control action, significantly reduce labor intensity and misoperation risk.

Description

Technical Field

[0001] This utility model relates to the field of sand and gravel filter technology, and in particular to an irrigation water filtration device. Background Technology

[0002] In the actual operation of drip irrigation systems, water sources often carry a large number of suspended particles, silt and organic impurities. If they enter the downstream pipe network directly, they are very likely to cause blockage of the sprinklers. Therefore, the sand filter is the first-stage interception device. Its interior is filled with multi-layer quartz sand filter media that has been screened and graded. The raw water enters from the top of the tank and flows from top to bottom through the sand layer. The tortuous pores formed between the sand particles physically intercept and adsorb impurities in the water. Larger suspended particles are blocked on the surface of the filter media, while finer particles are captured between the deeper sand particles. After a period of use, sand filters require backwashing for cleaning, which necessitates the coordinated operation of multiple valves. The conventional approach is to manually control each valve individually or to install an electric actuator on each valve to control their opening and closing. However, manual operation of multiple valves, especially during initial system installation and commissioning or pressure testing after filter media replacement, results in inconsistent water filling and venting conditions across pipelines. This requires operators to precisely control the water flow direction by manipulating each valve individually, leading to inconsistent valve opening and closing amplitudes. Furthermore, with electric actuators for each valve, failure of the actuator for a single valve prevents the valve from operating, interrupting the entire backwashing process. Additionally, decentralized control with multiple actuators presents the challenge of strictly synchronizing opening and closing sequences, resulting in deviations in valve actions. This can cause momentary pressure buildup or water hammer in the pipelines, impacting the tank and pipe fittings. Utility Model Content

[0003] The purpose of this utility model is to provide an irrigation water filtration device. When the manual-automatic actuator drives the drain valve to open and close, it drives the other three valves to move synchronously through the crank-connecting rod mechanism, completing the flow channel switching of filtration and backwashing in one operation. At the same time, the manual converter can disengage the linkage of each valve and control the opening and closing of each valve individually, which can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An irrigation water filtration device includes a filter tank. An upper connecting pipe is fixedly installed at the upper end of the filter tank, and a lower connecting pipe is fixedly installed at the lower end of the filter tank. A first tee pipe is fixedly installed at one end of the upper connecting pipe, and a second tee pipe is fixedly installed at one end of the lower connecting pipe. A first inlet valve is fixedly installed at one end of the main pipe of the first tee pipe, and a drain valve is fixedly installed at the other end. A second inlet valve is fixedly installed at one end of the main pipe of the second tee pipe, and a clean water valve is fixedly installed at the other end. Manual valves are respectively fixedly installed on the support flanges of the first inlet valve, the second inlet valve, and the clean water valve. The converter, the manual converter includes a fixed plate, a pull rod is inserted and installed inside the fixed plate, a limit shaft is coaxially fixedly installed at one end of the pull rod, a plurality of limit shafts are respectively inserted and installed at one end of the valve stem of the first water inlet valve, the second water inlet valve, and the clean water valve, a second crank and a third crank are sequentially mounted on the limit shaft at one end of the valve stem of the first water inlet valve, a first crank is fixedly installed at one end of the valve stem of the drain valve, a fifth crank and a sixth crank are sequentially mounted on the limit shaft at one end of the valve stem of the second water inlet valve, and a fourth crank is mounted on the limit shaft at one end of the valve stem of the clean water valve.

[0005] As a further preferred embodiment of this utility model, a sand injection port is provided at the upper end of the filter tank near the upper connecting pipe. An end cap is detachably fixedly installed on the sand injection port, and quartz sand can be injected into the filter tank through the sand injection port. Multiple support pillars are fixedly installed circumferentially along the lower end contour of the filter tank.

[0006] As a further preferred embodiment of this utility model, the first water inlet valve and the second water inlet valve are connected by a third three-way pipe, and water can be injected into the first three-way pipe or the second three-way pipe in sequence according to the cooperation direction of the first water inlet valve and the second water inlet valve.

[0007] As a further preferred embodiment of this utility model, a manual-automatic actuator is fixedly installed at one end of the support flange of the drain valve. The output shaft of the manual-automatic actuator is fixedly connected to one end of the valve stem of the drain valve through a coupling, so that the opening and closing of the drain valve can be controlled automatically or manually through the first crank.

[0008] As a further preferred embodiment of this utility model, multiple fixed discs are respectively fixedly installed at one end of the bracket flange of the first water inlet valve, the second water inlet valve, and the clean water valve, providing conditions for the installation of the tie rod and axial movement. Multiple positioning holes are equidistantly opened in the circumferential direction inside the fixed disc.

[0009] As a further preferred embodiment of this utility model, two fixed shafts are symmetrically fixedly installed on the outer side of the pull rod. An annular fixed ring is fixedly installed circumferentially on the outer side of the pull rod near the limiting shaft. A compression spring is fitted on the pull rod between the fixed ring and the fixed plate. One end of the compression spring abuts against one side of the fixed ring, and the other end abuts against one side of the fixed plate, so that the pull rod is compressed after being pulled, providing kinetic energy for the pull rod to reset. Two second toothed rings are fixedly installed circumferentially on the outer side of the limiting shaft.

[0010] As a further preferred embodiment of this utility model, the end of the pull rod away from the limiting shaft is provided with an operating handle. The two opposite side walls of the operating handle are provided with waist-shaped sliding grooves. The waist-shaped sliding grooves pass through and are slidably installed on the corresponding fixed shafts. In this way, when the operating handle is manually rotated, the groove length of the waist-shaped sliding groove can provide sliding allowance for the fixed shaft, realize the axial push-pull operation of the pull rod, and limit the return stroke of the fixed shaft. The operating handle is threadedly connected to the side wall of the fixed plate with a positioning bolt. When the valve stem of the first water inlet valve, the second water inlet valve, or the clean water valve is manually rotated, the operating handle can be held and its upper end can be used as a fulcrum to abut against one side of the fixed plate for rotation. This, in conjunction with the waist-shaped sliding grooves and the fixed shaft, pulls the pull rod and causes the pull rod to rotate around its own axis.

[0011] As a further preferred embodiment of this utility model, a smooth groove is provided at one end of the second crank, the third crank, the fifth crank, the sixth crank, and the fourth crank. A first toothed ring is fixedly installed along the groove surface inside the smooth groove. By switching between the second toothed ring provided outside the limiting shaft and the smooth groove and the first toothed ring inside the second crank, the third crank, the fifth crank, the sixth crank, and the fourth crank, the opening and closing actions of each valve can be controlled independently in the event of damage to the manual / automatic actuator.

[0012] As a further preferred embodiment of this utility model, a first connecting rod is rotatably mounted at the end of the first crank away from the drain valve stem, and the other end of the first connecting rod is rotatably mounted at the end of the third crank away from the first inlet valve stem. A second connecting rod is rotatably mounted at the end of the fourth crank away from the clean water valve stem, and the other end of the second connecting rod is rotatably mounted at the end of the sixth crank away from the second inlet valve stem. A third connecting rod is rotatably mounted at the end of the second crank away from the first inlet valve stem, and the other end of the third connecting rod is rotatably mounted at the end of the fifth crank away from the second inlet valve stem. This sequentially achieves the simultaneous control of the opening and closing actions of the first inlet valve, drain valve, second inlet valve, and clean water valve by means of the linkage between the first crank and the first connecting rod, the third crank, the second crank, the third connecting rod, the fifth crank, the sixth crank, the second connecting rod, and the fourth crank when the manual-automatic actuator controls the opening and closing action of the drain valve.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the drain valve, the first inlet valve, the second inlet valve, and the clean water valve form a rigid motion chain. The manual-automatic actuator only drives the drain valve, and through the sequential transmission of the first crank, the first connecting rod, the third crank, the second crank, the third connecting rod, the fifth crank, the sixth crank, the second connecting rod, and the fourth crank, the opening and closing actions of the four valves are completed synchronously. This simplifies the multi-step operation into a single control action, significantly reducing labor intensity and the risk of misoperation. The manual converter has a fixed plate and a pull rod assembly at each valve bracket flange. The second toothed ring on the outer circumference of the limit shaft at the end of the pull rod meshes with the first toothed ring in the smooth groove inside the crank to transmit the linkage torque. When the manual-automatic actuator fails or each valve needs to be controlled independently, simply hold the operating handle and pull it outward. The waist-shaped slide groove and the fixed shaft work together to compress the spring, causing the second toothed ring to disengage from the first toothed ring. Then, the valve stem can be turned to operate the corresponding valve independently. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the structure of the first tee pipe and the second tee pipe of this utility model; Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of point B in the middle; Figure 5 This is a schematic cross-sectional view of the manual converter, valve stem, second crank, and third crank assembly of the present invention. Figure 6 This is a schematic diagram of the disassembled structure of the first crank, the second crank, and the limiting shaft of this utility model.

[0015] In the diagram: 1. Filter tank; 2. Upper connecting pipe; 3. Lower connecting pipe; 4. First tee pipe; 5. Second tee pipe; 6. First inlet valve; 7. Drain valve; 8. Second inlet valve; 9. Clean water valve; 10. First crank; 11. Second crank; 12. Third crank; 13. Fourth crank; 14. Fifth crank; 15. Sixth crank; 16. First connecting rod; 17. Second connecting rod; 18. Third connecting rod; 19. Manual converter; 20. Fixed plate; 21. Pull rod; 22. Limiting shaft; 23. Sand injection port; 24. Support column; 25. Manual / automatic actuator; 26. Smooth groove; 27. First toothed ring; 28. Positioning hole; 29. ​​Second toothed ring; 30. Fixed ring; 31. Fixed shaft; 32. Operating handle; 33. Waist-shaped slide groove; 34. Positioning bolt; 35. Third tee pipe. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] like Figures 1-6 As shown, this utility model provides an irrigation water filtration device, including a filter tank 1. An upper connecting pipe 2 is fixedly installed at the upper end of the filter tank 1, and a lower connecting pipe 3 is fixedly installed at the lower end of the filter tank 1. A first three-way pipe 4 is fixedly installed at one end of the upper connecting pipe 2, and a second three-way pipe 5 is fixedly installed at one end of the lower connecting pipe 3. A first inlet valve 6 is fixedly installed at one end of the main pipe of the first three-way pipe 4, and a drain valve 7 is fixedly installed at the other end. A second inlet valve 8 is fixedly installed at one end of the main pipe of the second three-way pipe 5, and a clean water valve 9 is fixedly installed at the other end. Manual converters 19 are fixedly installed on the support flanges of the first inlet valve 6, the second inlet valve 8, and the clean water valve 9, respectively. The converter 19 includes a fixed plate 20, in which a pull rod 21 is inserted and installed. One end of the pull rod 21 is coaxially fixedly mounted with a limiting shaft 22. Multiple limiting shafts 22 are respectively inserted and installed at one end of the valve stems of the first water inlet valve 6, the second water inlet valve 8, and the clean water valve 9. A second crank 11 and a third crank 12 are sequentially mounted on the limiting shaft 22 at one end of the valve stem of the first water inlet valve 6. A first crank 10 is fixedly installed at one end of the valve stem of the drain valve 7. A fifth crank 14 and a sixth crank 15 are sequentially mounted on the limiting shaft 22 at one end of the valve stem of the second water inlet valve 8. A fourth crank 13 is mounted on the limiting shaft 22 at one end of the valve stem of the clean water valve 9.

[0018] like Figure 1 As shown, a sand injection port 23 is provided at the upper end of the filter tank 1 near the upper pipe 2. An end cap is detachably fixed on the sand injection port 23. Quartz sand can be injected into the filter tank 1 through the sand injection port 23. Multiple support pillars 24 are fixedly installed circumferentially along the lower end contour of the filter tank 1.

[0019] like Figure 1 , Figure 3 As shown, the first inlet valve 6 and the second inlet valve 8 are connected by a third three-way pipe 35. Water can be injected into the first three-way pipe 4 or the second three-way pipe 5 in sequence, depending on the cooperation direction of the first inlet valve 6 and the second inlet valve 8. A manual-automatic actuator 25 is fixedly installed at one end of the bracket flange of the drain valve 7. The output shaft of the manual-automatic actuator 25 is fixedly connected to one end of the valve stem of the drain valve 7 through a coupling. Thus, the opening and closing action of the drain valve 7 can be automatically or manually controlled by the first crank 10.

[0020] like Figures 2-6As shown, multiple fixed discs 20 are respectively fixedly installed on one end of the bracket flange of the first water inlet valve 6, the second water inlet valve 8, and the clean water valve 9, providing conditions for the installation and axial movement of the pull rod 21. Multiple positioning holes 28 are equidistantly opened circumferentially inside the fixed discs 20. Two fixed shafts 31 are symmetrically fixedly installed on the outer side of the pull rod 21. An annular fixed ring 30 is fixedly installed circumferentially on the outer side of the pull rod 21 near the limiting shaft 22. A compression spring is fitted onto the pull rod 21 between the fixed ring 30 and the fixed disc 20. One end of the compression spring abuts against one side of the fixed ring 30, and the other end abuts against one side of the fixed disc 20, thereby compressing the pull rod 21 after it is pulled, providing kinetic energy for the pull rod 21 to reset. The limiting shaft 22... Two second toothed rings 29 are fixedly installed circumferentially on the outer side. An operating handle 32 is provided at the end of the pull rod 21 away from the limiting shaft 22. A waist-shaped sliding groove 33 is provided on each of the opposite side walls of the operating handle 32. The waist-shaped sliding groove 33 passes through and slides on the corresponding fixed shaft 31. A positioning bolt 34 is threadedly connected to the side wall of the fixed plate 20 relative to the operating handle 32. When the valve stem of the first water inlet valve 6, the second water inlet valve 8, or the clean water valve 9 is manually rotated, the operating handle 32 can be held and rotated against one side of the fixed plate 20 with its upper end as the fulcrum. This, in conjunction with the waist-shaped sliding groove 33 and the fixed shaft 31, pulls the pull rod 21, causing the pull rod 21 to rotate around its own axis. The second crank 11, the third crank 12, the fifth crank 14, and the sixth crank 1... 5 and one end of the fourth crank 13 are respectively provided with a smooth groove 26. A first toothed ring 27 is fixedly installed along the groove surface inside the smooth groove 26. The second toothed ring 29 set outside the limiting shaft 22 cooperates with the smooth groove 26 and the first toothed ring 27 inside the second crank 11, third crank 12, fifth crank 14, sixth crank 15 and fourth crank 13 to switch, so as to realize the independent control of the opening and closing of each valve in the event that the manual-automatic actuator 25 is damaged. The first connecting rod 16 is rotatably installed at the end of the first crank 10 away from the valve stem of the drain valve 7. The other end of the first connecting rod 16 is rotatably installed at the end of the third crank 12 away from the valve stem of the first water inlet valve 6. The fourth crank 13 is rotatably installed at the end away from the valve stem of the clean water valve 9. The second connecting rod 17 has its other end rotatably mounted on the end of the sixth crank 15 away from the valve stem of the second inlet valve 8. The end of the second crank 11 away from the valve stem of the first inlet valve 6 is rotatably mounted with the third connecting rod 18. The other end of the third connecting rod 18 is rotatably mounted on the end of the fifth crank 14 away from the valve stem of the second inlet valve 8. When the manual-automatic actuator 25 controls the opening and closing of the drain valve 7, the first inlet valve 6, the drain valve 7, the second inlet valve 8, and the clean water valve 9 can be synchronously controlled by the linkage of the first crank 10 with the first connecting rod 16, the third crank 12, the second crank 11, the third connecting rod 18, the fifth crank 14, the sixth crank 15, the second connecting rod 17, and the fourth crank 13.

[0021] It should be noted that this utility model is an irrigation water filtration device. Before using the filter tank 1, quartz sand is injected into the filter tank 1 through the sand injection port 23, so that the quartz sand accumulates on the partition plate with filter screen in the filter tank 1, thereby forming a quartz sand filtration layer. Generally, two filter tanks 1 are used as a set. When filtering water, it can be injected into the third three-way pipe 35 on one side of one of the filter tanks 1 by a delivery pump. At this time, the second inlet valve 8 is closed, the clean water valve 9 is open, the first inlet valve 6 is open, and the drain valve 7 is closed. The water to be filtered enters the first three-way pipe 4 through the third three-way pipe 35 via the first inlet valve 6, and then enters the filter tank 1 through the guidance of the first three-way pipe 4 and the upper pipe 2. The water entering the filter tank 1 enters the quartz sand filter layer by gravity. After being filtered by the quartz sand filter layer, it enters the lower pipe 3 through the filter baffle in the filter tank 1. The filtered water then enters the second three-way pipe 5 through the lower pipe 3 and is discharged to the subsequent disc filter through the clean water valve 9. When it is necessary to clean the impurities in the quartz sand filter layer inside the filter tank 1, the manual / automatic actuator 25 can be activated. The actuator 25 then drives the valve stem of the drain valve 7, causing it to open. Simultaneously, the rotation of the drain valve 7's valve stem drives the first crank 10 to rotate. One end of the first crank 10, via the first connecting rod 16, pushes the third crank 12 to rotate. The third crank 12, through the engagement of the first toothed ring 27 within the smooth groove 26 at one end with the corresponding second toothed ring 29, rotates synchronously with the limiting shaft 22. The limiting shaft 22, in turn, drives the operating handle 32 via the pull rod 21 and the fixed shaft 31. The first inlet valve 6 rotates, and the limiting shaft 22 is inserted into one end of the valve stem of the first inlet valve 6. At this time, the limiting shaft 22 synchronously drives the valve stem of the first inlet valve 6 and the second crank 11 to rotate synchronously. Then, one end of the second crank 11 lifts and rotates the fifth crank 14 through the third connecting rod 18, and opens the second inlet valve 8 by means of the manual converter 19 at one end of the drain valve 7 bracket, as mentioned above. When the sixth crank 15 rotates, it drives the fourth crank 13 to rotate through the manual converter 19 at one end of the clear water valve 9 bracket via the second connecting rod 17. This causes the fourth crank 13 to drive the valve stem of the clear water valve 9 to rotate and close the clear water valve 9. At this time, the second inlet valve 8 is opened, the clear water valve 9 is closed, the first inlet valve 6 is closed, and the drain valve 7 is opened, so that the water filtered by another filter tank 1 is transported to the third three-way pipe 35 by the transfer pump, and enters the filter tank 1 in sequence through the second inlet valve 8, the second three-way pipe 5, and the lower pipe 3. It impacts the quartz sand layer from bottom to top, so that the impurities in the quartz sand layer are carried by the water flow and discharged through the upper pipe 2, the first three-way pipe 4, and the drain valve 7. When it is necessary to control the opening and closing of a single valve, such as controlling the opening and closing of the first inlet valve 6, simply hold the operating handle 32, making the upper end of the operating handle 32 abut against one side of the fixed plate 20 and rotate it. Then, the operating handle 32 pulls the fixed shaft 31 to one side through the waist-shaped slide groove 33, and causes the waist-shaped slide groove 33 to slide off the fixed shaft 31. Thus, the pull rod 21 slides to one side within the fixed plate 20 under the control of the operating handle 32, and compresses the compression spring fitted on the outside of the pull rod 21 towards the fixed plate 20 through the fixed ring 30. At this time, the pull rod 21 drives the limiting shaft 22 to move synchronously, so that one of the second toothed rings 29 on the outside of the limiting shaft 22 moves from the first toothed ring 27 at one end of the second crank 11 into the smooth groove at one end of the third crank 12. Inside 26, another second toothed ring 29 disengages from the first toothed ring 27 at one end of the third crank 12. At this time, the operating handle 32 can be manually rotated. The operating handle 32 drives the pull rod 21 to rotate through the cooperation of the waist-shaped sliding groove 33 and the operating handle 32. This causes the pull rod 21 to rotate the valve stem of the first water inlet valve 6 through the limiting shaft 22, without generating rotational torque on the second crank 11 and the third crank 12. After the adjustment is completed, the operating handle 32 is released, and the pull rod 21 is reset by the rebound force of the compression spring on the outside of the pull rod 21. This causes the second toothed ring 29 on the outside of the limiting shaft 22 to re-insert into the corresponding first toothed ring 27, and the positioning bolt 34 is rotated toward the fixing plate 20, so that one end of the positioning bolt 34 is inserted into the corresponding positioning hole 28 for limiting.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An irrigation water filtration device, characterized in that: The system includes a filter tank (1), with an upper connecting pipe (2) fixedly installed at the upper end and a lower connecting pipe (3) fixedly installed at the lower end. A first three-way pipe (4) is fixedly installed at one end of the upper connecting pipe (2), and a second three-way pipe (5) is fixedly installed at one end of the lower connecting pipe (3). A first inlet valve (6) is fixedly installed at one end of the main pipe of the first three-way pipe (4), and a drain valve (7) is fixedly installed at the other end. A second inlet valve (8) is fixedly installed at one end of the main pipe of the second three-way pipe (5), and a clean water valve (9) is fixedly installed at the other end. Manual converters (19) are fixedly installed on the support flanges of the first inlet valve (6), the second inlet valve (8), and the clean water valve (9), respectively. The manual converter (19) includes a fixed... The fixed plate (20) has a pull rod (21) inserted inside it. One end of the pull rod (21) is coaxially fixedly installed with a limiting shaft (22). Multiple limiting shafts (22) are respectively inserted into the valve stems of the first water inlet valve (6), the second water inlet valve (8), and the clean water valve (9). The second crank (11) and the third crank (12) are sequentially mounted on the limiting shaft (22) at the valve stem end of the first water inlet valve (6). The first crank (10) is fixedly installed on the valve stem end of the drain valve (7). The fifth crank (14) and the sixth crank (15) are sequentially mounted on the limiting shaft (22) at the valve stem end of the second water inlet valve (8). The fourth crank (13) is mounted on the limiting shaft (22) at the valve stem end of the clean water valve (9).

2. The irrigation water filtration device according to claim 1, characterized in that: The filter tank (1) has a sand inlet (23) at the upper end near the upper pipe (2). An end cap is detachably fixed on the sand inlet (23). Multiple support pillars (24) are fixedly installed on the filter tank (1) along the lower end contour.

3. The irrigation water filtration device according to claim 1, characterized in that: The first water inlet valve (6) and the second water inlet valve (8) are connected by a third three-way pipe (35).

4. The irrigation water filtration device according to claim 1, characterized in that: The drain valve (7) has a manual / automatic actuator (25) fixedly installed at one end of the bracket flange. The output shaft of the manual / automatic actuator (25) is fixedly connected to one end of the valve stem of the drain valve (7) through a coupling.

5. The irrigation water filtration device according to claim 1, characterized in that: Multiple fixed plates (20) are respectively fixedly installed on one end of the bracket flange of the first water inlet valve (6), the second water inlet valve (8), and the clean water valve (9).

6. The irrigation water filtration device according to claim 5, characterized in that: Two fixed shafts (31) are symmetrically fixedly installed on the outer side of the pull rod (21). A ring-shaped fixed ring (30) is fixedly installed circumferentially on the outer side of the pull rod (21) near the position of the limiting shaft (22). A compression spring is fitted on the pull rod (21) located between the fixed ring (30) and the fixed plate (20). Two second toothed rings (29) are fixedly installed circumferentially on the outer side of the limiting shaft (22).

7. The irrigation water filtration device according to claim 6, characterized in that: The pull rod (21) is provided with an operating handle (32) at one end away from the limiting shaft (22). The operating handle (32) has waist-shaped sliding grooves (33) on both opposite sides. The waist-shaped sliding grooves (33) are inserted and slidably installed on the corresponding fixed shaft (31). The operating handle (32) is threaded with a positioning bolt (34) relative to the side wall of the fixed plate (20).

8. The irrigation water filtration device according to claim 7, characterized in that: One end of the second crank (11), the third crank (12), the fifth crank (14), the sixth crank (15), and the fourth crank (13) is provided with a smooth groove (26), and a first toothed ring (27) is fixedly installed in the smooth groove (26) along the groove surface.

9. The irrigation water filtration device according to claim 8, characterized in that: The first crank (10) is rotatably mounted with a first connecting rod (16) at one end away from the valve stem of the drain valve (7). The other end of the first connecting rod (16) is rotatably mounted with a third crank (12) at one end away from the valve stem of the first inlet valve (6). The fourth crank (13) is rotatably mounted with a second connecting rod (17) at one end away from the valve stem of the clean water valve (9). The other end of the second connecting rod (17) is rotatably mounted with a sixth crank (15) at one end away from the valve stem of the second inlet valve (8). The second crank (11) is rotatably mounted with a third connecting rod (18) at one end away from the valve stem of the first inlet valve (6). The other end of the third connecting rod (18) is rotatably mounted with a fifth crank (14) at one end away from the valve stem of the second inlet valve (8).

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