A water-saving agricultural canal irrigation and drainage dual-purpose outlet

Abstract

The invention discloses a water-saving agricultural canal irrigation and discharge dual-purpose water outlet, belonging to the field of water conservancy engineering, the water outlet comprises a middle frame, two sides of the middle frame are respectively connected with a rectangular frame and a drainage groove, the rectangular frame is installed on the side wall of the agricultural canal, the upper and lower parts of the middle frame are respectively provided with a water outlet hole and a drainage hole, and a valve plate is slidably connected in the middle frame, and the valve plate slides on the water outlet hole and the drainage hole; the middle frame is hinged with a swing plate on one side facing the farmland, and two side baffles are symmetrically slidably connected on both sides of the swing plate, and a plurality of diversion columns are hinged on the upper surface of the swing plate, when the valve plate slides from the water outlet hole to the drainage hole, the swing plate and the diversion column are both swung up, and the two side baffles slide toward the upper surface of the swing plate, so that the water flow is diverted by the diversion column and falls to the drainage groove. The invention can distribute the diverted water flow more evenly in the farmland by diverting the water and guiding the drainage groove, avoiding the soil erosion problem caused by the water flow directly impacting the ground.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, in particular to a water-saving dual-purpose water outlet for irrigation and discharge of agricultural canals. Background Art

[0002] In water conservancy projects, farm canal irrigation systems are an important part of agricultural irrigation, and their design and operation efficiency are directly related to the stability and sustainability of agricultural production. Traditional farm canal irrigation systems often use fixed water outlets, which cannot be flexibly adjusted according to the actual water demand and soil conditions of the farmland during the irrigation process, resulting in a large waste of water resources and low irrigation efficiency.

[0003] During the irrigation process, the speed and impact of water flow on soil erosion cannot be ignored. High-speed water flow will accelerate soil erosion, destroy soil structure, and affect the growth environment of crops. Especially in the agricultural canal irrigation system, since water usually flows from high to low, the speed and impact of water flow are often large, and the erosion effect on the soil is more obvious. Therefore, when the irrigation speed needs to be increased, the existing water outlet is not easy to slow down the erosion of the soil. Summary of the invention

[0004] The purpose of the present invention is to provide a water-saving agricultural canal irrigation and discharge dual-purpose water outlet, which solves the problem that the existing water outlet is not easy to slow down soil erosion when the irrigation speed needs to be increased.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a water-saving agricultural canal irrigation and drainage dual-purpose water outlet, comprising a middle frame, two sides of which are respectively connected to a rectangular frame and a drainage groove, the rectangular frame is installed on the side wall of the agricultural canal, the upper and lower parts of the middle frame are respectively provided with a water outlet hole and a drainage hole, and a valve plate is slidably connected in the middle frame, and the valve plate slides on the water outlet hole and the drainage hole;

[0006] A swing plate is hinged on the side of the middle frame facing the farmland, and two side baffles are symmetrically slidably connected to the two sides of the swing plate. A plurality of diverter columns are hinged on the upper surface of the swing plate. When the valve plate slides from the drain hole to the drainage hole, the swing plate and the diverter column both swing upward, and the two side baffles slide toward the upper surface of the swing plate, so that the water flow is diverted by the diverter column and falls into the drainage trough.

[0007] Preferably, a screw is rotatably connected to the top of the valve plate, the screw is threadedly connected to the top of the middle frame, and a rotating wheel is connected to the top of the screw.

[0008] Preferably, the top of the middle frame is rotatably connected to a small gear ring and a large gear meshing with the small gear ring, the small gear ring is key-slidingly connected to the screw, a storage roller is connected to the large gear, a pull rope is wound around the storage roller, and one end of the pull rope away from the storage roller is wound around the rotating shaft of the swing plate.

[0009] Preferably, the rectangular frame and the middle frame are both rotatably connected with guide wheels, and the pull rope is attached to the two side walls of the guide wheels.

[0010] Preferably, the middle frame is connected to a circular ring eccentrically arranged with respect to the rotating shaft, and one end of the rotating shaft away from the pull rope is connected to a radially arranged active hydraulic rod, and the output end of the active hydraulic rod is slidably connected to the inner wall of the circular ring;

[0011] The lower surface of the swing plate is slidably connected with an extension plate, a passive hydraulic rod is connected inside the swing plate, an output end of the passive hydraulic rod is connected to the extension plate, and a pipeline is connected between the active hydraulic rod and the passive hydraulic rod.

[0012] Preferably, sliding rods are connected to both sides of the extension plate, and the side baffle is provided with an inclined sliding groove that cooperates with the sliding rod. When the swing plate swings, the sliding rod slides in the inclined sliding groove to drive the side baffle to slide along the board surface direction of the swing plate.

[0013] Preferably, a friction block is provided on the upper surface of the extension plate, the friction block is fitted to the hinge shaft of the diverter column, and the sliding direction of the friction block is perpendicular to the axial direction of the hinge shaft of the diverter column, so that the friction block drives the diverter column to swing when sliding.

[0014] Preferably, a filter is hinged in the drainage trough, and a first limit rod and a second limit rod are connected in the drainage trough. The filter swings between the first limit rod and the second limit rod. When the valve plate moves up so that the drainage hole is opened, the accumulated water in the farmland passes through the filter and the drainage hole and flows into the farm canal.

[0015] Preferably, a counterweight block is connected to the end of the filter screen, and the counterweight block applies force to the filter screen so that the filter screen swings down and contacts the second limiting rod.

[0016] Preferably, two mud discharge holes are symmetrically opened on both sides of the drainage groove, a circular plate is rotatably connected in the mud discharge hole, a first rotating rod is connected to the radial middle of the circular plate, and a transmission tooth is connected to the bottom of the first rotating rod;

[0017] A second rotating rod is connected to the side of the filter screen away from the counterweight block, and the second rotating rod is rotatably connected to the drainage groove. A U-shaped frame is connected to the second rotating rod, and a rack meshing with the transmission gear is inserted in the U-shaped frame. The rack slides linearly in the drainage groove, and blocking rods are connected to the rack on both sides of the U-shaped frame. When the filter screen swings toward the direction of the first limit rod, the circular plate rotates to open the mud discharge hole.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. When the present invention is used to irrigate farmland, the control valve plate moves downward to open the drain hole. At this time, the water in the farm channel flows into the farmland through the drain hole. When the amount of water needs to be increased, the distance the control valve plate moves downward increases, so that the opening of the drain hole increases, thereby increasing the water flow rate. When the downward distance of the valve plate increases, the swing plate starts to swing upward from a horizontal state, so that the horizontal flow rate is relieved when the water flows to the swing plate that swings upward. In addition, when the swing plate swings upward, the diverter column also swings upward, so that the diverter column can protrude from the upper surface of the swing plate, so that the water flowing through the upper surface of the swing plate can be diverted into multiple small streams after impacting the diverter column, thereby making the horizontal flow rate of the water once again relieved. The water after diversion falls on the drainage trough and then flows to the farmland. The setting of the drainage trough prevents the water flow from directly impacting the ground. After the water flow passes through the above-mentioned diversion and deceleration, the erosion force on the soil is reduced, and the probability of the formation of vortices or turbulence is also reduced, thereby protecting the soil, thereby saving water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the swing plate of the present invention after swinging;

[0022] Figure 3 It is a structural schematic diagram of the passive hydraulic rod of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the valve plate of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the inclined chute of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the split column of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the pull rope of the present invention;

[0027] Figure 8 It is a structural schematic diagram of the filter screen of the present invention;

[0028] Fig. 9 For the present invention Figure 8 Schematic diagram of the structure of part A.

[0029] In the figure: 1, middle frame; 11, rectangular frame; 12, drain hole; 13, drainage hole; 14, valve plate; 15, screw; 151, runner; 2, swing plate; 21, extension plate; 22, rotating shaft; 23, diverter column; 24, friction block; 25, slide bar; 26, side baffle; 27, inclined slide groove; 28, ring; 29, active hydraulic rod; 291, passive hydraulic rod; 292, pipeline; 3, storage roller; 31, large gear; 32, small gear ring; 33, pull rope; 34, guide wheel; 4, drainage groove; 401, mud discharge hole; 41, first limit rod; 42, second limit rod; 43, filter screen; 44, counterweight; 45, round plate; 451, first rotating rod; 46, second rotating rod; 47, U-shaped frame; 48, rack; 481, stop rod; 49, transmission tooth. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Reference Figure 1-Figure 9 , this embodiment provides a technical solution: a water-saving agricultural canal irrigation and discharge dual-purpose water outlet, comprising a middle frame 1, with rectangular frames 11 and drainage grooves 4 connected to the two sides of the middle frame 1 respectively, the rectangular frame 11 is installed on the side wall of the agricultural canal, and the upper and lower parts of the middle frame 1 are respectively provided with water discharge holes 12 and drainage holes 13, and a valve plate 14 is slidably connected in the middle frame 1, and the valve plate 14 slides on the water discharge holes 12 and the drainage holes 13; a swing plate 2 is hingedly connected to the side of the middle frame 1 facing the farmland, and two side baffles 26 are symmetrically slidably connected to the two sides of the swing plate 2, and a plurality of diversion columns 23 are hingedly connected to the upper surface of the swing plate 2. When the valve plate 14 slides from the water discharge hole 12 to the drainage hole 13, the swing plate 2 and the diversion column 23 are both swung up, and the two side baffles 26 slide toward the upper surface of the swing plate 2, so that the water flow is diverted by the diversion column 23 and falls into the drainage groove 4.

[0032] When it is necessary to irrigate the farmland, the control valve plate 14 moves downward to open the drain hole 12. At this time, the water in the farm channel flows into the farmland through the drain hole 12. When the amount of water needs to be increased, the control valve plate 14 moves downward to increase the distance, so that the opening of the drain hole 12 increases, thereby increasing the water flow rate. When the downward movement distance of the valve plate 14 increases, the swing plate 2 starts to swing upward from the horizontal state, so that the horizontal flow rate is relieved when the water flows to the swing plate 2 that swings upward. In addition, when the swing plate 2 swings upward, the diverter column 23 also swings upward, so that the diverter column 23 can protrude from the upper surface of the swing plate 2, so that the water flowing through the upper surface of the swing plate 2 can be diverted into multiple small streams after impacting the diverter column 23, thereby relieving the horizontal flow rate of the water again. The diverted water falls on the drainage trough 4 and then flows to the farmland. The setting of the drainage trough 4 prevents the water flow from directly impacting the ground. After the water flow is diverted and decelerated, the erosion force on the soil is reduced, and the probability of eddy current or turbulence formation is also reduced, thereby protecting the soil and saving water.

[0033] The height of the valve plate 14 can be adaptably increased, and a groove sufficient to accommodate the valve plate 14 is opened at the bottom of the middle frame 1, so that the valve plate 14 can block the drain hole 12 and the drainage hole 13 at the same time, and sufficient margin is set at the upper part of the middle frame 1, so that the valve plate 14 can move up to fully open the drainage hole 13.

[0034] The top of the valve plate 14 is rotatably connected to a screw rod 15 , the screw rod 15 is threadedly connected to the top of the middle frame 1 , and the top of the screw rod 15 is connected to a rotating wheel 151 .

[0035] The screw rod 15 is driven to rotate by manually rotating the rotating wheel 151, so as to realize the lifting and lowering of the valve plate 14. In addition, a motor can also be provided to drive the screw rod 15 to rotate.

[0036] The top of the middle frame 1 is rotatably connected to a small gear ring 32 and a large gear 31 meshing with the small gear ring 32. The small gear ring 32 is slidably connected to the screw 15. The large gear 31 is connected to a storage roller 3. A pull rope 33 is wound around the storage roller 3. The end of the pull rope 33 away from the storage roller 3 is wound around the rotating shaft 22 of the swing plate 2.

[0037] The small gear ring 32 is rotatably connected to the top of the middle frame 1 and will not move relative to the middle frame 1. When the screw 15 rotates, it is transmitted to the small gear ring 32 through the key to drive the small gear ring 32 to rotate, and the screw 15 can slide relative to the small gear ring 32, so that the movement of the valve plate 14 is not interfered with. When the small gear ring 32 rotates, it drives the large gear 31 to rotate, so that the storage roller 3 connected to the large gear 31 rotates. At this time, the storage roller 3 stores the pull rope 33, so that the pull rope 33 on the rotating shaft 22 is released, and the rotating shaft 22 rotates at the same time, so that the swing plate 2 swings upward, and when the screw 15 is rotated in the opposite direction, the pull rope 33 on the storage roller 3 is released, and the swing plate 2 swings back to its original position under the action of its own weight, so that the rotating shaft 22 stores the pull rope 33 again.

[0038] The rectangular frame 11 and the middle frame 1 are both rotatably connected with guide wheels 34 , and the pull rope 33 is attached to the side walls of the two guide wheels 34 .

[0039] The setting of the guide wheel 34 fixes the pulling direction of the pull rope 33, so that the pull rope 33 can be released and stored stably. At the same time, the guide wheel 34 also reduces the wear speed of the pull rope 33.

[0040] A circular ring 28 eccentrically arranged with the rotating shaft 22 is connected to the middle frame 1, and a radially arranged active hydraulic rod 29 is connected to the end of the rotating shaft 22 away from the pull rope 33, and the output end of the active hydraulic rod 29 is slidably connected to the inner wall of the circular ring 28; an extension plate 21 is slidably connected to the lower surface of the swing plate 2, and a passive hydraulic rod 291 is connected inside the swing plate 2, and the output end of the passive hydraulic rod 291 is connected to the extension plate 21, and a pipe 292 is connected between the active hydraulic rod 29 and the passive hydraulic rod 291.

[0041] When the swing plate 2 is in a horizontal state, the active hydraulic rod 29 is in its longest state. As the swing plate 2 swings, the output end of the active hydraulic rod 29 slides on the inner wall of the ring 28 and gradually shortens, so that the medium in the active hydraulic rod 29 is transmitted to the passive hydraulic rod 291 through the pipe 292. At this time, the passive hydraulic rod 291 is extended, thereby pushing out the extension plate 21, so that the total length of the swing plate 2 and the extension plate 21 is increased, thereby enhancing the deceleration effect on the water flow.

[0042] Slide rods 25 are connected to both sides of the extension plate 21, and an inclined slot 27 cooperating with the slide rods 25 is provided on the side baffle plate 26. When the swing plate 2 swings, the slide rod 25 slides in the inclined slot 27 to drive the side baffle plate 26 to slide along the plate surface direction of the swing plate 2.

[0043] When the extension plate 21 slides in a direction away from the swing plate 2, the slide bar 25 Figure 5 In this state, the side baffle 26 slides from the upper right to the lower left of the inclined slide groove 27, and the sliding direction of the side baffle 26 relative to the swing plate 2 is fixed, so that the side baffle 26 can only slide upward relative to the swing plate 2, reducing the amount of water flowing out from both sides of the swing plate 2.

[0044] A friction block 24 is provided on the upper surface of the extension plate 21. The friction block 24 is attached to the hinge axis of the diverter column 23, and the sliding direction of the friction block 24 is perpendicular to the axial direction of the hinge axis of the diverter column 23, so that the friction block 24 drives the diverter column 23 to swing when sliding.

[0045] When the extension plate 21 slides, the friction block 24 and the hinge shaft of the diverter column 23 generate static friction, so that the hinge shaft of the diverter column 23 rotates, and then the diverter column 23 swings and protrudes from the plate surface of the swing plate 2, diverting the water flowing through the plate surface of the swing plate 2.

[0046] A filter screen 43 is hinged in the drainage trough 4, and a first limit rod 41 and a second limit rod 42 are connected in the drainage trough 4. The filter screen 43 swings between the first limit rod 41 and the second limit rod 42. When the valve plate 14 moves up to open the drainage hole 13, the accumulated water in the farmland passes through the filter screen 43 and the drainage hole 13 and flows into the farm canal.

[0047] When it is necessary to drain the farmland, the screw 15 is rotated to move the valve plate 14 upward and open the drainage hole 13. At this time, the water in the farmland can flow through the drainage hole 13 to the farm canal for discharge. Before the water flows into the drainage hole 13, it needs to pass through the filter screen 43, and the filter screen 43 is arranged in the drainage trough 4 and is inclined near the lower part of the drainage trough 4, so that the soil carried in the drainage can be intercepted by the filter screen 43, preventing a large amount of soil from entering the farm canal and preventing the drainage hole 13 from being blocked. When the amount of soil accumulation at the bottom of the filter screen 43 increases, the resistance of the water flow through the filter screen 43 will increase, so that the water flow force will push the filter screen 43 to swing in the direction of the first limit rod 41, so that the filter screen 43 can intercept the increase in the height of the soil, avoiding the subsequent soil from flowing into the drainage hole 13 from the top of the filter screen 43 after the soil is accumulated too high.

[0048] A counterweight block 44 is connected to the end of the filter screen 43 , and the counterweight block 44 applies force to the filter screen 43 so that the filter screen 43 swings down and contacts the second limiting rod 42 .

[0049] The arrangement of the counterweight block 44 enables the filter screen 43 to have a tendency to swing toward the second limiting rod 42, so that the filter screen 43 can swing down and reset itself after the soil accumulated at the bottom of the filter screen 43 disappears.

[0050] Two mud discharge holes 401 are symmetrically provided on both sides of the drainage trough 4, a circular plate 45 is rotatably connected in the mud discharge hole 401, a first rotating rod 451 is connected to the radial middle part of the circular plate 45, and a transmission tooth 49 is connected to the bottom of the first rotating rod 451; a second rotating rod 46 is connected to the side of the filter screen 43 away from the counterweight block 44, the second rotating rod 46 is rotatably connected to the drainage trough 4, a U-shaped frame 47 is connected to the second rotating rod 46, a rack 48 meshing with the transmission tooth 49 is inserted in the U-shaped frame 47, the rack 48 slides linearly in the drainage trough 4, and blocking rods 481 are connected to the rack 48 on both sides of the U-shaped frame 47. When the filter screen 43 swings toward the direction of the first limit rod 41, the circular plate 45 rotates to open the mud discharge hole 401.

[0051] When the filter screen 43 swings upward due to the accumulation of soil, the second rotating rod 46 swings synchronously. At this time, the U-shaped frame 47 connected to the second rotating rod 46 pushes the rack 48 to slide through the stop rod 481, so that the rack 48 drives the transmission gear 49 to rotate. At this time, the first rotating rod 451 rotates, causing the circular plate 45 to rotate, so that the mud discharge hole 401 is opened. The mud discharge holes 401 are symmetrically arranged on both sides of the drainage trough 4 and are located at the bottom of the filter screen 43. When the subsequent drainage flows to the filter screen 43, it can cause an impact on the mud accumulated at the bottom of the filter screen 43, so that the mud is slowly discharged from the drainage trough 4 through the mud discharge holes 401, thereby alleviating the situation that a large amount of mud accumulates at the bottom of the filter screen 43 and has a greater impact on the permeability of the filter screen 43. In addition, if the mud accumulated at the bottom of the filter screen 43 is cleaned, the counterweight block 44 can reset the filter screen 43. At this time, the U-shaped frame 47 pulls the rack 48 to reset through the stop rod 481, so that the circular plate 45 rotates to close the mud discharge hole 401.

[0052] In addition, when irrigating farmland, the water after flowing down falls on the drainage trough 4 and can also impact and clean the soil accumulated at the bottom of the filter screen 43 .

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-saving agricultural canal irrigation and drainage dual-purpose water outlet, comprising a middle frame (1), characterized in that: The two sides of the middle frame (1) are respectively connected to a rectangular frame (11) and a drainage groove (4); the rectangular frame (11) is installed on the side wall of the agricultural canal; the upper part and the lower part of the middle frame (1) are respectively provided with a water discharge hole (12) and a drainage hole (13); and the middle frame (1) is slidably connected to a valve plate (14); the valve plate (14) slides on the water discharge hole (12) and the drainage hole (13); A swing plate (2) is hingedly connected to the side of the middle frame (1) facing the farmland, two side baffles (26) are symmetrically slidably connected to the two sides of the swing plate (2), and a plurality of diversion columns (23) are hingedly connected to the upper surface of the swing plate (2). When the valve plate (14) slides from the water discharge hole (12) to the water discharge hole (13), the swing plate (2) and the diversion columns (23) both swing upward, and the two side baffles (26) slide toward the upper surface of the swing plate (2), so that water flows are diverted by the diversion columns (23) and then fall into the drainage trough (4); The top of the valve plate (14) is rotatably connected to a screw rod (15), the screw rod (15) is threadedly connected to the top of the middle frame (1), and the top of the screw rod (15) is connected to a rotating wheel (151); The top of the middle frame (1) is rotatably connected to a small toothed ring (32) and a large gear (31) meshing with the small toothed ring (32); the small toothed ring (32) is slidably connected to the screw rod (15); a storage roller (3) is connected to the large gear (31); a pull rope (33) is wound around the storage roller (3); an end of the pull rope (33) away from the storage roller (3) is wound around the rotating shaft (22) of the swing plate (2); The middle frame (1) is connected to a circular ring (28) eccentrically arranged with respect to the rotating shaft (22); one end of the rotating shaft (22) away from the pull rope (33) is connected to a radially arranged active hydraulic rod (29); the output end of the active hydraulic rod (29) is slidably connected to the inner wall of the circular ring (28); The lower surface of the swing plate (2) is slidably connected to an extension plate (21), a passive hydraulic rod (291) is connected inside the swing plate (2), an output end of the passive hydraulic rod (291) is connected to the extension plate (21), and a pipe (292) is connected between the active hydraulic rod (29) and the passive hydraulic rod (291); Both sides of the extension plate (21) are connected to sliding rods (25), and the side baffle plate (26) is provided with an inclined sliding groove (27) that cooperates with the sliding rod (25). When the swing plate (2) swings, the sliding rod (25) slides in the inclined sliding groove (27) to drive the side baffle plate (26) to slide along the plate surface direction of the swing plate (2); A friction block (24) is provided on the upper surface of the extension plate (21), the friction block (24) being in contact with the hinge shaft of the diverter column (23), and the sliding direction of the friction block (24) being perpendicular to the axial direction of the hinge shaft of the diverter column (23), so that the friction block (24) drives the diverter column (23) to swing when sliding.

2. The water-saving agricultural canal irrigation and drainage dual-purpose outlet according to claim 1 is characterized by: The rectangular frame (11) and the middle frame (1) are both rotatably connected to guide wheels (34), and the pull rope (33) is attached to the side walls of the two guide wheels (34).

3. The water-saving agricultural canal irrigation and drainage dual-purpose outlet according to claim 2 is characterized by: A filter screen (43) is hingedly connected in the drainage groove (4), and a first limit rod (41) and a second limit rod (42) are connected in the drainage groove (4). The filter screen (43) swings between the first limit rod (41) and the second limit rod (42), and when the valve plate (14) moves upward to open the drainage hole (13), the accumulated water in the farmland passes through the filter screen (43) and the drainage hole (13) and flows into the farm channel.

4. The water-saving agricultural canal irrigation and drainage dual-purpose outlet according to claim 3 is characterized by: The end of the filter screen (43) is connected to a counterweight block (44), and the counterweight block (44) applies force to the filter screen (43) so that the filter screen (43) swings down and contacts the second limiting rod (42).

5. The water-saving agricultural canal irrigation and drainage dual-purpose outlet according to claim 4 is characterized by: Two mud discharge holes (401) are symmetrically provided on both sides of the drainage groove (4), a circular plate (45) is rotatably connected in the mud discharge hole (401), a first rotating rod (451) is connected to the radial middle of the circular plate (45), and a transmission tooth (49) is connected to the bottom of the first rotating rod (451); A second rotating rod (46) is connected to a side of the filter screen (43) away from the counterweight (44); the second rotating rod (46) is rotatably connected to the drainage groove (4); a U-shaped frame (47) is connected to the second rotating rod (46); a rack (48) meshing with the transmission gear (49) is inserted into the U-shaped frame (47); the rack (48) slides linearly in the drainage groove (4); both sides of the rack (48) located on the U-shaped frame (47) are connected to blocking rods (481); when the filter screen (43) swings in the direction of the first limiting rod (41), the circular plate (45) rotates to open the mud discharge hole (401).

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