Multifunctional variable-slope water tank

Abstract

The invention relates to the technical field of hydraulic physical model experiment equipment, in particular to a multifunctional variable-slope water tank which comprises a water tank body, a water inlet tank is arranged at one end of the water tank body, a water outlet tank is arranged at the other end of the water tank body, the water inlet tank and the water outlet tank are connected through multiple water tank bodies, and the multiple water tank bodies comprise multiple water tank bottom plates connected end to end; water tank frames are arranged on the two sides of each water tank bottom plate, and a lifting adjusting seat is arranged below the connecting point of every two adjacent water tank bottom plates. By arranging the rotationally connected water tank bottom plate, the water tank can be bent and deformed in the horizontal plane; by arranging the lifting adjusting base capable of being adjusted in a three-axis mode, the gradient and the bending degree of the water tank can be accurately and rapidly adjusted and controlled; the structure limitation of an existing variable slope water tank is broken through, combination of multi-section type variable slope and horizontal bending deformation of the water tank is achieved, the research experiment range of hydraulic problems is expanded, various experiment environments with higher complexity can be simulated, and the water tank has important value in the field of hydraulic experiments.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic physics model experimental equipment, in particular to a multifunctional variable slope water tank. Background Art

[0002] The experimental flume is an experimental device widely used in various scientific research experiments involving fluid properties, such as water conservancy engineering experiments, port and navigation engineering experiments, and ecological and environmental engineering experiments. In the experiments, researchers usually need to constantly change the slope, flow, water level, sand content, and sediment grooves set in the flume to study the changes in the slope hydrodynamic parameters with different environments. In order to meet the experimental needs, the flume needs to have multiple functions, including slope change, sand supply, flow control, etc.

[0003] Existing variable slope flumes usually only have the ability to change the slope of the flume. For example, there is an existing patent with application number CN202222778883.1, which discloses a multi-stage variable slope flume experimental device, including several flume sections that are interconnected and interpenetrating with each other, and the flume sections at both ends serve as water inlets and outlets respectively; the flume section includes a bottom plate, side plates and an external frame, and the bottom plates and side plates of adjacent flume sections are connected by flexible sealing belts, and the frames of adjacent flume sections are hinged by a rotating shaft, and the rotating shaft is fixedly installed on the top of the lifting mechanism below it; the lifting mechanism is installed on the base; a mud groove is provided on the bottom plate of the flume section, and an inclinometer is installed at the bottom; this patent can achieve the effect of multi-stage slope change by setting up multiple sections of separately adjustable flumes, but cannot realize the simulation experiment of curved waterways, thereby limiting the use scenarios of the equipment and making it difficult to complete more complex fluid mechanics experiments. Summary of the invention

[0004] The object of the present invention is to provide a multifunctional variable slope water flume which can be bent and deformed to simulate a curved waterway environment.

[0005] Based on the above purpose, the present invention adopts the following technical solution: A multifunctional variable slope water tank comprises a water tank, wherein a water inlet box is arranged at one end of the water tank, and a water outlet box is arranged at the other end, the water inlet box and the water outlet box are connected by a multi-section water tank, and the multi-section water tank comprises a plurality of water tank bottom plates connected end to end; water tank frames are arranged on both sides of the water tank bottom plates, and lifting adjustment seats are arranged below the connection points of two adjacent water tank bottom plates; a water inlet is arranged in the water inlet box, a water supply pipe is arranged in coordination with the water inlet, and a sand supply mechanism is arranged on the top of the water inlet box; a water outlet is arranged in the water outlet box, and a T-shaped slot is connected to the bottom of the water outlet, and two outlet ends of the T-shaped slot are respectively arranged as a return channel and a sand settling tank.

[0006] Preferably, the lifting and adjusting seat includes a horizontally arranged lifting plate, and the four corners of the lifting plate are provided with through holes; the through holes at the four corners of the lifting plate are coaxially provided with fastening nuts, and the fastening nuts are rotatably connected to the lifting plate; the four corners of the lifting plate are provided with lifting studs, and the lifting studs pass through the through holes and are matched with the fastening nuts.

[0007] Preferably, a pair of symmetrical horizontal adjustment plates are provided on the lifting plate, and the pair of horizontal adjustment plates are vertically matched with the lifting plate; adjustment grooves are provided on the horizontal adjustment plates along the length direction, and a pair of horizontal adjustment screws are provided between the pair of horizontal adjustment plates; the two ends of the horizontal adjustment screws are respectively passed through the adjustment grooves.

[0008] Preferably, the lifting and adjusting seat includes a vertically arranged support column, and the cross-section of the support column is an I-shaped structure; the bottom end of the support column is provided with through holes respectively cooperating with a pair of horizontal adjustment screws, and the horizontal adjustment screws are arranged through the through holes at the bottom of the support column; fastening nuts cooperating with a pair of horizontal adjustment screws are respectively arranged on the two outer sides of the bottom of the support column, and a spherical joint is arranged at the top of the support column.

[0009] Preferably, both ends of the sink bottom plate are semicircular structures, and a spherical joint groove that cooperates with the spherical joint is provided at the midpoint of the arc on the bottom surface of one end of the sink bottom plate; a circular groove is provided on the top surface of one end of the sink bottom plate with the spherical joint groove, and a matching circular groove is provided on the bottom surface of the other end; a pair of matching rotating shafts and rotating bearing structures are respectively provided in the circular grooves at both ends of the sink bottom plate, and the rotating shaft and the rotating bearing are both coaxially arranged with the circular grooves.

[0010] Preferably, a transparent plate is embedded in the sink frame, and elastic waterproof glue is provided along the connecting seam between the sink bottom plate and the sink frame; a waterproof connecting plate is provided between two adjacent sink frames on the same side, and the waterproof connecting plate includes an elastic waterproof plate provided on the inner side of the sink, and the two ends of the elastic waterproof plate are respectively fixedly connected to the two adjacent sink frames; a folding connecting plate is provided on the outer side of the sink, and the bottoms of the elastic waterproof plate and the folding connecting plate are both fixedly provided on an elastic waterproof strip.

[0011] Preferably, an elastic connecting strip is provided on the circular groove of the sink bottom plate, and the elastic connecting strip is arranged perpendicular to the length direction of the sink bottom plate; the elastic connecting strip is arranged in the gap position of the two sink frames, and the two elastic connecting strips at both ends of the sink bottom plate are arranged in a coordinated manner.

[0012] Preferably, a lifting motor is provided at the bottom of the lifting stud, and the output shaft of the lifting motor is coaxially fixedly connected with the lifting stud; a longitudinal adjuster is provided on the outer side of the horizontal adjustment plate at one end of the lifting plate, and a longitudinal slide groove is provided on the end of the longitudinal adjuster close to the horizontal adjustment plate; a pair of transverse adjustment motors are slidably provided on the longitudinal slide groove, and the pair of transverse adjustment motors are respectively connected with a pair of horizontal adjustment screws.

[0013] Preferably, the sand supply mechanism comprises a water mixing and stirring barrel, which is connected to the sand discharge device through a water mixing pipe; a flow stabilizing device is provided downstream of the water inlet, and a flow meter is provided on the water supply pipeline.

[0014] Preferably, a tail gate is provided at one end of the water tank close to the water outlet box, and a triangular water measuring weir is provided upstream of the water outlet in the water outlet box; the water outlet is connected to one end of the T-shaped groove through a flower pipe, and a plurality of sand retaining plates are provided in the sedimentation tank.

[0015] The beneficial effects of the present invention include: The present invention adopts a segmented water tank structure, which can adjust the slope and curvature of the water tank in segments, can realize the simulation of more complex fluid environments, and expand the applicable experimental range; the present invention uses a three-axis lifting and adjusting seat structure that can perform up and down lifting, lateral displacement and longitudinal displacement to control the movement and deformation of the water tank, and its deformation freedom is high, which can not only realize the adjustment of the slope of the water tank, but also directly form a curved water tank structure, and can also simultaneously achieve the effects of water tank slope change and water tank bending; at the same time, its deformation adjustment is simple and fast, and the fixation is firm and durable, which is of great significance for the research and experiment of hydraulic problems.

[0016] The water tank structure of the present invention is completely modular in design. Each water tank and the lifting and adjusting seat in the multi-section water tank can be installed and used independently. The multi-section water tank structure of different lengths and numbers can be installed according to specific use needs, further expanding the complexity of the simulated waterway structure of the present invention and increasing the flexibility of use. The device of the present invention can perform a curved secondary flow test and a curved sediment separation test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A top view of the overall structure of Embodiment 1 of the present invention; Figure 2 It is a three-dimensional schematic diagram of the structure of the water tank part of Example 1 of the present invention; Figure 3 It is a schematic diagram of the structure of the lifting and adjusting seat of the present invention; Figure 4 This is a schematic diagram of a partially bent state of a water tank according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of a partially curved and slope-changing state of a water tank in Example 1 of the present invention; Figure 6 This is a schematic diagram of the structure of the lifting and adjusting seat according to Embodiment 2 of the present invention.

[0018] In the figure: a water tank bottom plate 1; a circular groove 11; a rotating shaft 12; an elastic connecting strip 13; a water tank frame 2; a transparent plate 21; a waterproof connecting plate 22; a water inlet 3; a water supply pipe 31; a water supply valve 32; a water mixing and stirring barrel 33; a sand discharge device 34; a flow stabilizing device 35; a water outlet 4; a tailgate 41; a return channel 42; a sedimentation tank 43; a sand retaining plate 44; a lifting and adjusting seat 5; a lifting plate 51; a lifting stud 52; a fastening nut 53; a horizontal adjustment plate 54; an adjusting slide 55; a horizontal adjustment screw 56; a support column 57; a ball joint 58; a lifting motor 6; a longitudinal adjuster 7; a longitudinal slide 71; a transverse adjustment motor 8. DETAILED DESCRIPTION

[0019] Example 1 The following is a further explanation of the present invention in conjunction with specific embodiments. Figure 1 As shown, the present invention is a multifunctional variable slope water tank, including a water tank structure with a multi-section design, wherein the main body of the water tank structure includes a water tank bottom plate 1 with multiple sections connected end to end, and water tank frames 2 are arranged on both sides of the water tank bottom plate 1; a water inlet box and a water outlet box are respectively connected at both ends of the water tank, a water inlet 3 is arranged in the water inlet box, and a water outlet 4 is arranged in the water outlet box.

[0020] A sand discharge device 34 is provided at one end of the top of the water inlet tank near the water tank. The sand discharge device 34 is connected to two water mixing barrels 33 through a water mixing pipe. A stirring shaft is provided in the water mixing barrel 33. The stirring shaft is driven by a variable frequency motor to mix the water in the water mixing barrel 33 with the sediment, and then provide the sediment mixed water into the water inlet tank through the water mixing pipe and the sand discharge device 34; a plurality of flow stabilizing devices 35 are provided in the downstream direction of the water inlet 3 in the water inlet tank to stabilize the water flow; the water inlet 3 is supplied with water through a water supply pipe 31, a flow meter is provided on the water supply pipe 31 to record the water inlet flow, and the water inlet is controlled by a water supply valve 32.

[0021] A tailgate 41 is provided at the connection between the water outlet box and the water tank. The tailgate 41 is opened and closed by a motor-driven gear rack. When the tailgate 41 is closed, the water tank is closed, and the water in the water tank cannot be discharged from the water outlet 4. A triangular water weir is provided at the upstream end of the water outlet 4 in the water outlet box to monitor and read the flow rate downstream of the water tank. The bottom of the water outlet 4 is connected to the T-slot through a flower pipe, so that the water discharged from the water outlet 4 can be initially separated from the sediment. The part with high sediment content is introduced into the sedimentation tank 43, and the sediment in the water is filtered and recovered through the sand retaining plate 44. The water without sediment after filtering through the flower pipe is recovered through the return channel 42.

[0022] The specific structure of the sink is as follows Figure 2As shown, it includes a sink bottom plate 1 connected end to end; both ends of the sink bottom plate 1 are arranged in a semicircular arc structure, and a circular groove 11 is arranged on the top surface of one end, and a circular groove 11 is arranged on the bottom surface of the other end; a pair of matching rotating shafts 12 and rotating bearing structures are respectively arranged in the circular grooves 11 at both ends, and the rotating shaft 12 and the rotating bearing are coaxially arranged in the circular grooves 11 where they are located; after the two sink bottom plates 1 are connected in the first position so that the rotating shaft 12 and the rotating bearing are matched and connected, the two circular grooves 11 at both ends will also be matched and connected, and at this time the top surfaces and bottom surfaces of the two sink bottom plates 1 are aligned, so that the bottom surface in the sink maintains the same horizontal height; because they are connected by a vertically arranged rotating shaft, the two connected sink bottom plates 1 can rotate around the axis, such as Figure 4 shown.

[0023] A pair of sink frames 2 are vertically connected to both sides of the sink bottom plate 1, and a transparent plate 21 is embedded in the sink frame 2, through which the situation inside the sink can be observed; a waterproof connecting plate 22 is arranged between two adjacent sink frames 2 on the same side, and the waterproof connecting plate 22 includes an elastic waterproof strip arranged at the bottom, and an elastic waterproof plate and a folding connecting plate are arranged on the elastic waterproof strip; the elastic waterproof plate is arranged on the inner side of the sink, and can cooperate with the elastic waterproof strip to prevent water leakage in the sink, and the folding connecting plate plays the role of an external fixed structure to avoid deformation of the elastic waterproof plate under the influence of water flow and water pressure, resulting in the waterway structure and experimental results being affected; when there is bending or lifting and changing slopes between two adjacent sink bottom plates 1, the elastic waterproof plate and the folding connecting plate can also be deformed adaptively to maintain the structure of the sink side wall; elastic waterproof glue is arranged at the joints between the sink bottom plate 1 and the sink frame 2, which can prevent the water in the sink from seeping out from the gap, and at the same time does not affect the deformation connection between the sinks.

[0024] An elastic connecting strip 13 is provided at the position of the circular groove 11 of the sink bottom plate 1. The elastic connecting strip 13 is perpendicular to the length direction of the sink bottom plate 1, so that when the sink bottom plate 1 is in a state where the heights of the two ends are different, the sink bottom plate 1 can be bent at the position of the elastic connecting strip 13. Figure 5 As shown; the elastic connecting strip 13 is arranged at the gap between two adjacent sink frames 2, so that when it is bent, the waterproof connecting plate 22 can be deformed to maintain the sink side wall structure.

[0025] A lifting and adjusting seat 5 is arranged below the connection point of two adjacent water tank bottom plates 1. Figure 3As shown, a three-axis adjustment mechanism is arranged in the lifting and adjusting seat 5, which can realize the lifting and lowering, lateral and longitudinal movement of the sink bottom plate 1; the lifting and adjusting seat 5 mainly includes a horizontally arranged lifting plate 51, and the four corners of the lifting plate 51 are provided with through holes, and fastening nuts 53 are rotatably connected to the through holes; four vertically arranged lifting studs 52 pass through the through holes and are connected with the fastening nuts 53, and the relative lifting and lowering movement between the lifting studs 52 and the lifting plate 15 can be controlled by rotating the fastening nuts; a support plate structure is arranged at the bottom end of the lifting studs 52, which can support the lifting and adjusting seat 5.

[0026] A pair of vertical horizontal adjustment plates 54 are arranged on the lifting plate 51, and the horizontal adjustment plates 54 are symmetrically arranged along the center plane of the lifting plate 51; an adjustment slide 55 is horizontally arranged on the horizontal adjustment plate 54, and a pair of horizontal adjustment screws 56 are arranged between the two horizontal adjustment plates 54; both ends of the horizontal adjustment screw 56 are respectively passed through the adjustment slide 55, and a pair of nuts are respectively arranged on the inner and outer sides of the adjustment slide 55 to fix the horizontal adjustment screw 56; a support column 57 is passed through the horizontal adjustment screw 56, and the cross section of the support column 57 is an I-shaped structure, and a support column 57 is arranged at the bottom thereof to be connected to the horizontal adjustment screw 56 Four matching through holes are provided for the horizontal adjustment screw 56 to pass through; a nut matching the horizontal adjustment screw 56 is rotatably connected to the bottom side of the support column 57, and the position of the support column 57 on the horizontal adjustment screw 56 can be controlled by rotating the nut; a spherical joint 58 is provided on the top of the support column 57, and a spherical joint groove structure is provided at one end of the sink bottom plate 1 to cooperate with it. By matching the spherical joint 58 with the spherical joint groove, the sink bottom plate 1 can be supported and controlled by the support column 57. When the support column 57 performs three-axis movement, it will also drive one end of the sink bottom plate 1 to which it is connected to perform synchronous three-axis movement.

[0027] When the present invention is actually used, according to the experimental requirements to be carried out, a suitable number of multi-section water troughs are selected, and the two ends of the water troughs are respectively connected to the water inlet box and the water outlet box; after the assembly connection is completed, the deformation setting of the water trough can be carried out; first, the slope of the water trough is set, and the nuts at both ends of the horizontal adjustment screw 56 are loosened so that it can slide in the adjustment slide 55, and then the height of the lifting plate 51 is changed by rotating the tightening nut 53, and then the height of the support column 57 can be changed, and then the inclination slope of the water trough bottom plate 1 can be changed; when the slope setting is completed, the water trough is bent and deformed; the horizontal horizontal position of the support column 57 can be changed by rotating the nut at the bottom of the support column 57, thereby changing the bending direction of the water trough bottom plate 1; when the slope and curvature are adjusted, the nuts at both ends of the horizontal adjustment screw 56 can be tightened to lock the sliding of the horizontal adjustment screw 56 along the horizontal longitudinal direction, and the adjustment of the lifting adjustment seat 5 is completed.

[0028] After the water tank is set up, the experimental environment in the water tank can be arranged, and then the water supply valve 22 can be opened to carry out hydraulic experiments; if sediment needs to be added, sediment and water can be added to the mixing bucket 33, and the sediment mixed water can be mixed and discharged into the water inlet tank through the sand discharge device 34.

[0029] Example 2 The difference between this embodiment and embodiment 1 is that Figure 6 As shown, the lifting and adjusting seat 5 used in this embodiment is controlled by a motor drive.

[0030] In this embodiment, the bottom of the four lifting studs 52 are connected to a lifting motor 6, which can control the rotation of the lifting studs 52, and the fastening nuts 53 are fixed on the lifting plate 51; when the lifting motor 6 controls the rotation of the lifting studs 52, it will drive the lifting plate 51 to move up and down.

[0031] A longitudinal adjuster 7 is provided at one end of the lifting plate 51, and a longitudinal slide groove 71 is provided on the longitudinal adjuster 7, and a pair of transverse adjustment motors 8 are slidably connected in the longitudinal slide groove 71; a longitudinal adjustment motor is provided in the longitudinal adjuster 7, which can control the transverse adjustment motor 8 to slide in the longitudinal slide groove 71; the transverse adjustment motor 8 can drive the horizontal adjustment screw 56 to rotate; the nut provided at the bottom of the support column 57 is also fixedly provided on the outer surface of the support column 57, and when the horizontal adjustment screw 56 rotates under the control of the transverse adjustment motor 8, it will drive the support column 57 to move horizontally and transversely.

[0032] The lifting motor 6, longitudinal adjustment motor and lateral adjustment motor 8 in this embodiment all adopt servo motors and are connected to a control console for control; the console signal is connected to the host computer, and the slope and bending angle of each section of the water tank can be directly adjusted through the host computer, making the deformation adjustment of the water tank simpler and faster, and can achieve high-precision adjustment.

[0033] The above description is only a further explanation of the present invention in combination with specific embodiments. All descriptions do not limit the scope of protection of the present invention. Any changes or replacement schemes that can be easily thought of by any technician in this field within the technical scope disclosed by the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A multifunctional variable slope water tank, comprising a water tank, one end of which is provided with a water inlet tank, and the other end of which is provided with a water outlet tank, characterized in that: The water inlet box and the water outlet box are connected by a multi-section water trough, and the multi-section water trough includes a plurality of water trough bottom plates connected end to end; water trough frames are arranged on both sides of the water trough bottom plates, and a lifting adjustment seat is arranged below the connection point of two adjacent water trough bottom plates; a water inlet is arranged in the water inlet box, a water supply pipe is arranged in coordination with the water inlet, and a sand supply mechanism is arranged on the top of the water inlet box; a water outlet is arranged in the water outlet box, and a T-shaped slot is connected to the bottom of the water outlet, and two outlet ends of the T-shaped slot are respectively arranged as a return channel and a sand settling tank.

2. The multifunctional variable slope water tank according to claim 1, characterized in that: The lifting adjustment seat includes a horizontally arranged lifting plate, and the four corners of the lifting plate are provided with through holes; the through holes at the four corners of the lifting plate are coaxially provided with fastening nuts, and the fastening nuts are rotatably connected to the lifting plate; the four corners of the lifting plate are provided with lifting studs, and the lifting studs pass through the through holes and are matched with the fastening nuts.

3. The multifunctional variable slope water tank according to claim 2 is characterized in that: A pair of symmetrical horizontal adjustment plates are arranged on the lifting plate, and the pair of horizontal adjustment plates are vertically matched with the lifting plate; adjustment slide grooves are arranged along the length direction of the horizontal adjustment plates, and a pair of horizontal adjustment screws are arranged between the pair of horizontal adjustment plates; both ends of the horizontal adjustment screws are respectively arranged through the adjustment slide grooves.

4. The multifunctional variable slope water tank according to claim 3 is characterized in that: The lifting and adjusting seat includes a vertically arranged support column, and the cross-section of the support column is an I-shaped structure; the bottom end of the support column is provided with through holes respectively cooperating with a pair of horizontal adjustment screws, and the horizontal adjustment screws are arranged through the through holes at the bottom of the support column; fastening nuts cooperating with the pair of horizontal adjustment screws are respectively arranged on the two outer sides of the bottom of the support column, and a spherical joint is arranged on the top of the support column.

5. The multifunctional variable slope water tank according to claim 4, characterized in that: Both ends of the sink bottom plate are semicircular structures, and a spherical joint groove that cooperates with the spherical joint is arranged at the midpoint of the bottom arc at one end of the sink bottom plate; a circular groove is arranged on the top surface of one end of the sink bottom plate with the spherical joint groove, and a matching circular groove is arranged on the bottom surface of the other end; a pair of matching rotating shafts and rotating bearing structures are respectively arranged in the circular grooves at both ends of the sink bottom plate, and the rotating shaft and the rotating bearing are both coaxially arranged with the circular grooves.

6. The multifunctional variable slope water tank according to claim 5, characterized in that: A transparent plate is embedded in the sink frame, and elastic waterproof glue is provided along the connecting seam between the sink bottom plate and the sink frame; a waterproof connecting plate is provided between two adjacent sink frames on the same side, and the waterproof connecting plate includes an elastic waterproof plate provided on the inner side of the sink, and the two ends of the elastic waterproof plate are respectively fixedly connected to the two adjacent sink frames; a folding connecting plate is provided on the outer side of the sink, and the bottoms of the elastic waterproof plate and the folding connecting plate are both fixedly provided on an elastic waterproof strip.

7. The multifunctional variable slope water tank according to claim 6, characterized in that: An elastic connecting strip is arranged on the circular groove of the sink bottom plate, and the elastic connecting strip is arranged perpendicular to the length direction of the sink bottom plate; the elastic connecting strip is arranged in the gap position of the two sink frames, and the two elastic connecting strips at both ends of the sink bottom plate are arranged in a coordinated manner.

8. The multifunctional variable slope water tank according to claim 4, characterized in that: A lifting motor is arranged at the bottom of the lifting stud, and the output shaft of the lifting motor is coaxially fixedly connected with the lifting stud; a longitudinal adjuster is arranged on the outer side of the horizontal adjustment plate at one end of the lifting plate, and a longitudinal slide groove is arranged on the end of the longitudinal adjuster close to the horizontal adjustment plate; a pair of transverse adjustment motors are slidably arranged on the longitudinal slide groove, and the pair of transverse adjustment motors are respectively matched and connected with a pair of horizontal adjustment screws.

9. The multifunctional variable slope water tank according to claim 1, characterized in that: The sand supply mechanism comprises a water mixing and stirring barrel, and the water mixing and stirring barrel is connected to the sand discharge device through a water mixing pipe; a flow stabilizing device is arranged downstream of the water inlet, and a flow meter is arranged on the water supply pipeline.

10. The multifunctional variable slope water tank according to claim, characterized in that: A tailgate is arranged at one end of the water trough close to the water outlet box, and a triangular water measuring weir is arranged upstream of the water outlet in the water outlet box; the water outlet is connected with one end of the T-shaped groove through a flower pipe, and a plurality of sand retaining plates are arranged in the sedimentation tank.

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