A device and method for dredging delivery technology research

Abstract

The application discloses a device and method for dredging conveying technology research, and belongs to the field of pipeline conveying technology research. The device comprises four parts of a sand hopper system, a recovery pool system, a pipeline conveying system and a measurement control system. The sand hopper system and the recovery pool system form a double-redundancy recovery system. In case of any failure such as blockage or valve jam of any one set of the recovery system, the device can be quickly switched to another set of the recovery system, thereby improving the convenience and safety of the experiment. The pipeline conveying system comprises a motor, a pump and a circulating pipeline and the like, and is used for providing circulating power of the sand-water mixture and a slurry passage. The measurement control system comprises a sensor, a control acquisition system and the like, and is used for controlling the equipment and measuring and adjusting key parameters such as pipeline flow rate and silt concentration in the process of silt injection, the circulating experiment and observation process and the recovery process. The application further discloses methods of sand adding, conveying experiment and sand recovery and the like when the dredging silt conveying experiment is carried out by relying on the device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solid-liquid conveying, and particularly relates to a device and method for dredging conveying technology research. BACKGROUND

[0002] Dredging is a process of breaking rock-soil under water by excavating machine, and then conveying the mixture of mud and water to a specified water area or onshore stockpile through a conveying pump and pipeline, which plays an important role in land reclamation, channel excavation and maintenance, and reservoir capacity recovery. As the largest energy-consuming part in dredging engineering, how to optimize the process equipment through experimental means to reduce the energy consumption and pump blocking probability is of great significance to improve the dredging construction efficiency and reduce the unit cost.

[0003] However, when using a dredger for on-site conveying experiment, the boundary conditions of the experiment are uncontrollable due to the complex and variable soil and water environment, and the machine power of the mud pump unit of the dredger is several thousand or even tens of thousands of kilowatts, which makes the experimental cost very high and the risk relatively large. Therefore, it is necessary to carry out dredging pipeline conveying experiments in the laboratory, which can simulate the actual construction environment, have controllable experimental boundary conditions, high testing accuracy, and easy data collection. Through a scientific and reasonable experimental scheme, a large amount of data close to the actual ship construction can be obtained in the laboratory, so that the design, manufacture of mud pump equipment of large dredgers, and pipeline conveying process optimization and improvement can be based on solid theoretical and experimental research, ensuring the reliability and advancement of self-developed dredging equipment.

[0004] The existing solid material pipeline conveying experimental platform is mainly applied to the metallurgical, coal, chemical, food and other industries, and can simulate the pipeline conveying conditions in the related fields, but if it is applied to the pipeline conveying experiment of dredging sand particles, there are still some problems, such as large material consumption, difficulty in recycling, replacing and reusing solid materials, one-way increase of pipeline concentration, and inability to conduct bidirectional and repetitive experiments, and serious heating after long-time operation of the circulating pipeline, which affects the measurement accuracy and instrument life. Therefore, the present application aims to provide a device and method specially used for dredging conveying technology research, and provide a convenient, advanced and reliable model experiment platform for the development of mud pump of dredger and the optimization of pipeline conveying process. SUMMARY

[0005] The present application is based on the demand for dredging conveying technology research, and a series of creative works are carried out to solve the problems of the existing solid material pipeline conveying experimental platform, as follows.

[0006] (1)Pipe concentration two-way increase and decrease and recycling technology: through the lifting of the lifting pipe in the sand adding / recycling sand hopper and the switching of the pipe valve, the functions of sand injection, sand injection stop and sand recycling can be realized, so that the two-way increase and decrease adjustment of the pipe concentration and recycling can be realized under the condition of not stopping the machine, in cooperation with the real-time observation of the density meter.

[0007] (2)Double redundancy sand recycling technology: the sand hopper system and the recycling pool system form a double redundancy recycling system. When one set of system cannot recycle material due to valve failure, it can be quickly switched to another set of recycling system, greatly reducing the risk of pipe and pump blockage caused by inability to recycle. The invention can also be selectively recycled according to experimental needs. For example, the material of repeated experiments can be directly recycled to the sand hopper, and the next experiment can save the time of adding material. When the material needs to be discarded or replaced, it can be recycled to the ground recycling pool for easy cleaning.

[0008] (3)Circulating pipe temperature control technology: when the circulating pipe is overheated after a long time of operation, the bypass valve can be slightly opened to allow the cold water in the sand hopper to participate in the pipe circulation. After a period of time, the pipe can be significantly cooled.

[0009] (4)Boarded material dispersion technology: by setting a high-pressure water jet in the sand hopper at a suitable position, hardened and boarded material that has been placed for a long time can be dispersed and smoothly added to the circulating conveying pipeline.

[0010] In summary, the invention solves the problems of the prior art and provides a good experimental platform for dredging and conveying technology research, which has a wide application prospect.

[0011] In order to achieve the above purpose, the technical scheme adopted by the invention is:

[0012] A device for dredging and conveying technology research, comprising a sand hopper system, a recycling pool system, a pipe conveying system and a measurement and control system.

[0013] The sand hopper system comprises a sand adding / recycling sand hopper, a sand hopper bypass pipe, a first recycling valve, a second recycling valve, a discharging valve, a discharging pipe, a emptying valve, an emptying pipe, a conveying fluid, experimental mud material, a winch support beam, a lifting electric winch, a steel wire rope, a lifting pipe, a guide ring, a guide ring fixing frame, a mud sand isolation sleeve, a mud sand isolation sleeve fixing frame, a hollow ring, an umbrella-shaped dispersion plate and an umbrella-shaped dispersion plate support.

[0014] The recycling pool system comprises a recycling pool, a third recycling valve, a fourth recycling valve and a fifth recycling valve.

[0015] The pipeline conveying system comprises a circulating pipeline, a conveying pump, a shaft coupling, and a motor; the circulating pipeline comprises pipeline one, pipeline two, pipeline three, pipeline four, pipeline five, pipeline six, pipeline seven, pipeline eight, pipeline nine, pipeline ten, and pipeline eleven; the shaft coupling comprises shaft coupling one and shaft coupling two;

[0016] The measurement control system comprises several flow meters, density meters, differential pressure sensors, pressure measuring tubes, and data acquisition systems; the several flow meters, density meters, differential pressure sensors, and real-time data acquisition systems are installed on the circulating pipeline; the flow meters comprise flow meter one and flow meter two, the density meters comprise density meter one and density meter two, the differential pressure sensors comprise differential pressure sensor one, differential pressure sensor two, differential pressure sensor three, and differential pressure sensor four, and the pressure measuring tubes comprise pressure measuring tube one, pressure measuring tube two, pressure measuring tube three, pressure measuring tube four, pressure measuring tube five, pressure measuring tube six, pressure measuring tube seven, and pressure measuring tube eight; the data acquisition system comprises a host computer monitoring computer, a communication cable, and a PLC control cabinet.

[0017] In the sand hopper system, the bottom of the sand feeding / recovery hopper is connected with pipe No. 1 and pipe No. 9 through a discharge pipeline to form a three-way pipeline; the sand hopper bypass pipeline enters the upper part of the sand feeding / recovery hopper and sprays downward through an elbow; the hollow ring is installed at the elbow, the steel wire rope passes through the hollow ring, the umbrella-shaped dispersion plate is installed below the hollow ring and is conical, the steel wire rope passes through the hole in the middle of the umbrella-shaped dispersion plate, the umbrella-shaped dispersion plate is connected to the sand feeding / recovery hopper through the umbrella-shaped dispersion plate support, the sand hopper bypass pipeline sprays onto the umbrella-shaped dispersion plate through the elbow after passing through the upper part of the sand feeding / recovery hopper and the middle part of the sand feeding / recovery hopper, the experimental mud sand material is placed at the bottom of the sand feeding / recovery hopper and is immersed in the conveying fluid, the guide ring is arranged inside the sand feeding / recovery hopper, the guide ring is connected with the sand feeding / recovery hopper through a plurality of guide ring fixing frames, the mud sand isolation sleeve is arranged inside the sand feeding / recovery hopper, the mud sand isolation sleeve is installed at the lower part of the guide ring, the mud sand isolation sleeve is connected with the sand feeding / recovery hopper through a plurality of mud sand isolation sleeve fixing frames arranged in parallel from top to bottom, the guide ring is concentric with the mud sand isolation sleeve, the lifting pipe passes through the guide ring and the mud sand isolation sleeve, the gap between the guide ring and the lifting pipe is smaller than the gap between the mud sand isolation sleeve and the lifting pipe, the lifting pipe is vertically arranged at the center of the sand feeding / recovery hopper and penetrates the guide ring and the mud sand isolation sleeve, the lifting pipe is a hollow pipe, the winch support cross beam is fixed at the top of the sand feeding / recovery hopper, the lifting electric winch is installed on the winch support cross beam, the lifting electric winch is connected with the lifting pipe through the steel wire rope to control the lifting pipe to rise or fall, the first recovery valve is arranged on the sand hopper bypass pipeline, the second recovery valve is arranged on pipe No. 9, the discharge valve is arranged on the discharge pipeline, the emptying pipeline is a branch of the discharge pipeline, the emptying valve is arranged on the emptying pipeline, a plurality of high-pressure nozzles are arranged on the lower conical surface of the sand feeding / recovery hopper in a circle, which can spray high-pressure water to disperse the hardened and consolidated materials in the sand hopper, and an overflow pipe is further arranged at the upper end of the sidewall of the sand feeding / recovery hopper, which can discharge excess water.

[0018] The sand hopper has an opening at the bottom, the diameter of which is the same as that of the discharge pipe, and the lifting pipe is a hollow pipe with a diameter slightly larger than that of the discharge pipe. By controlling the rising and falling of the lifting pipe, the sand injection, suspension and recovery can be realized without stopping the experiment during the experiment.

[0019] Sand injection: lift the lifting pipe to a certain height away from the discharge port of the sand hopper bottom, the experimental mud sand material enters the discharge pipeline under the action of gravity, and the sand and water are injected into the circulating pipeline by opening the discharge valve. The discharge pipeline is inclined, and the sand injected into the circulating pipeline can be quickly dispersed and smoothly merged into the existing slurry in the circulating pipeline.

[0020] Sand injection stop: Lower the lifting pipe to the bottom of the sand tank, isolate the experimental sand material from the pipe, and stop the sand from entering the pipe.

[0021] Sand recovery: When the pipe concentration needs to be reduced or the experimental sand material needs to be recovered, first lower the lifting pipe to the bottom of the sand tank to isolate the sand material from the pipe, then open the first recovery valve and the sand outlet valve, and close the second recovery valve. At this time, the water-sand mixture in the circulating pipe enters the sand addition / recovery tank through the bypass formed by the sand tank bypass pipe and the first recovery valve. The experimental sand material naturally deposits in the sand tank due to the sudden reduction in flow rate, and the water and sand are separated. The turbid water reenters the circulating pipe through the sand outlet pipe, maintaining the continuity of the flow, achieving simple, fast, and continuous sand-water separation and recovery. The recovered sand in the sand tank can be directly added to the pipe for repeated use.

[0022] In the recovery pool system, the third recovery valve is arranged on pipe eight, the fourth recovery valve is arranged on pipe ten, the fifth recovery valve is arranged on pipe eleven, one end of the recovery pool is connected to pipe ten through the fourth recovery valve, and the other end is connected to pipe eleven through the fifth recovery valve; pipe ten, the fourth recovery valve, the recovery pool, the fifth recovery valve, and pipe eleven form a fluid channel for recovering sand in the recovery pool.

[0023] In the pipe conveying system and the measurement control system, the conveying pump is connected to the motor through coupling one, a torque instrument, and coupling two. The right end of pipe one is connected to the suction end of the conveying pump, and the output end of the conveying pump is connected to pipe two. Pressure measuring pipe one and pressure measuring pipe two are installed on pipe one and pipe two, and are connected to differential pressure sensor one. The lower end of flow meter one is connected to pipe two, and the upper end is connected to pipe three. Differential pressure sensor two is installed on pipe three and is connected to pipe three through pressure measuring pipe three and pressure measuring pipe four. Pipe four is connected to pipe three and pipe five through an elbow. Differential pressure sensor three is installed on pipe five and is connected to pipe five through pressure measuring pipe five and pressure measuring pipe six. Density meter one is installed on pipe five. Density meter two is installed on pipe six. The right side of flow meter two is connected to pipe six, and the left side is connected to pipe seven. Differential pressure sensor four is installed on pipe seven and is connected to pipe seven through pressure measuring pipe seven and pressure measuring pipe eight. Pipe seven, pipe eight, and pipe ten form a three-way pipe. One end of the recovery pool is connected to pipe ten. The other end of the recovery pool is connected to the middle section of pipe one through pipe eleven, forming a three-way pipe with pipe one. Pipe eight is connected to pipe nine and the sand tank bypass pipe, forming a three-way pipe.

[0024] Preferably, the above-mentioned recovery pool system further comprises a water-permeable sand retaining wall located in the recovery pool, close to pipe eleven.

[0025] Preferably, the above-mentioned recycling tank system further comprises a plurality of sand boxes, including sand box one, sand box two, sand box three and sand box four, which are placed at the bottom of the recycling tank; the pipeline ten has four branches on the pipeline extending into the recycling tank, which lead to sand box one, sand box two, sand box three and sand box four respectively; the end of the pipeline ten is connected to the pipeline twelve through a fixed flange group, and the other end of the pipeline twelve is connected to the recycling tank.

[0026] Preferably, a plurality of high-pressure nozzles are arranged circumferentially on the lower conical surface of the sand hopper system.

[0027] Preferably, a travel sensor is arranged above the lifting pipe to detect the current height of the lifting pipe. The travel of the lifting pipe can be detected in real time, so as to obtain the size of the space above the discharge port and control the speed and amount of sand of the discharge.

[0028] Preferably, the discharge pipeline is inclined and forms an angle with the pipeline one. The inclination direction is consistent with the flow direction of the slurry in the pipeline.

[0029] Preferably, the mud and sand isolation sleeve pipe fixing frame has two layers.

[0030] The sand hopper system and the recycling tank system constitute a one-to-one backup double-redundancy mud and sand recycling system. When one set of system cannot normally recycle due to failure such as stuck recycling valve, it can be quickly switched to another set of recycling system without shutdown, effectively avoiding the great trouble caused by forced shutdown due to failure to recycle, such as pipe and pump blockage.

[0031] The guide ring is concentric with the mud and sand isolation sleeve pipe, and the guide ring is located at the upper part of the mud and sand isolation sleeve pipe. The lifting pipe passes through the guide ring and the mud and sand isolation sleeve pipe. The mud and sand isolation sleeve pipe can bear most of the earth pressure in the sand filling / recycling hopper, effectively avoiding the problem that the lifting pipe cannot be lifted out when the dense sand material is directly piled around the lifting pipe, making the lifting and lowering of the lifting pipe more flexible, and the two-way regulation of mud and sand injection, recycling, and concentration increase / decrease very convenient.

[0032] After a long period of experimental operation, the water temperature in the circulating pipeline increases, and the fluid viscosity increases, which will affect the measurement accuracy and the service life of the instrument. At this time, the first recycling valve and the discharge valve can be slightly opened, so that part of the muddy water in the circulating pipeline enters the sand hopper through the bypass composed of the sand hopper bypass pipe and the first recycling valve, and part of the cold water in the sand hopper returns to the circulating pipeline through the lifting pipe to participate in the circulation. After a period of time, the pipeline can be effectively cooled.

[0033] The sand hopper bypass pipe is connected with the upper part of the sand adding / recovery hopper, the tangential guide groove is installed in the sand adding / recovery hopper, and the sand hopper bypass pipe enters the sand adding / recovery hopper at the pipe opening.

[0034] The recovery pool is low in position and spacious, and has a large operation area and is convenient to clean.

[0035] A method for dredging and conveying technology research is provided, which uses the device, and includes an experimental mud material adding process, a conveying experiment process, an experimental mud material recovery to the sand adding / recovery hopper process and an experimental mud material recovery to the recovery pool process.

[0036] The experimental mud material adding process includes the following steps.

[0037] A1, the first recovery valve, the second recovery valve, the third recovery valve, the fourth recovery valve, the fifth recovery valve and the feeding valve are opened, the emptying valve is closed, the lifting pipe is lifted along the guide ring through the lifting electric winch, and the circulating pipeline, the sand adding / recovery hopper and the recovery pool are filled with the conveying fluid, wherein the height of the conveying fluid in the sand adding / recovery hopper must reach the overflow pipe.

[0038] A2, the lifting pipe is lowered to the lowest position along the guide ring through the lifting electric winch, and the bottom of the sand adding / recovery hopper is isolated from the feeding pipeline.

[0039] A3, the experimental mud material to be added is weighed on the ground, so that the volume of the added experimental mud material is calculated.

[0040] A4, the experimental mud material is loaded into the sand adding / recovery hopper through the conveyor belt or the loader, so that the experimental mud material is immersed in the conveying fluid.

[0041] A5, the feeding valve is closed, and then the first recovery valve, the fourth recovery valve and the fifth recovery valve are closed.

[0042] A6, the conveying pump is started, the rotating speed of the conveying pump is adjusted, and the reading of the flowmeter is recorded, so that the conveying fluid flows in the circulating pipeline at a constant speed.

[0043] A7, the feeding valve is opened.

[0044] A8, the high-pressure water of each high-pressure water jet is connected to high-pressure water, and the high-pressure water is sprayed into the interior of the sand adding / recovery hopper to disperse the experimental mud material.

[0045] Step A9, start lifting the lifting pipe by the lifting electric winch, connect the bottom of the sand adding / recycling tank with the eighth downpipe, observe the reading of the density meter one, record the concentration of the experimental slurry material in the fifth circulating pipe when the value of the density meter one is stable, if the concentration does not reach the required concentration, continue to add the experimental slurry material by lifting the lifting pipe by the lifting electric winch, increase the concentration, until the concentration of the experimental slurry material reaches the required concentration, the opening of the bottom of the sand adding / recycling tank can be changed by changing the height of the lifting pipe, so as to adjust the downflow speed in real time;

[0046] Step A10, further lower the lifting pipe along the guide ring to the lowest position by the lifting electric winch, isolate the bottom of the sand adding / recycling tank from the eighth downpipe, close the downflow valve, and the adding of the experimental slurry material is completed;

[0047] Step A11, if multiple concentrations are required in the experiment, the steps A8-A10 can be repeated multiple times to meet the experimental requirements;

[0048] The conveying experiment process comprises the following steps,

[0049] Step B1, observe the value of the density meter one on the circulating pipe, when the average concentration is near the measured concentration and is stable, record the values of the density meter one on the vertical pipe and the density meter two on the horizontal pipe in real time;

[0050] Step B2, record the values of the flow meter one on the vertical pipe and the flow meter two on the horizontal pipe in real time while recording the value of the density meter one in real time;

[0051] Step B3, record the values of the differential pressure sensor one at the pump inlet and the differential pressure sensor four on the horizontal pipe in real time while recording the value of the density meter one in real time;

[0052] Step B4, record the value of the torque instrument in real time while recording the value of the density meter one in real time;

[0053] Step B5, repeat steps B1-B4 for different measured concentrations;

[0054] The experimental slurry material recycling process to the sand adding / recycling tank comprises the following steps,

[0055] Step C1, adjust the rotating speed of the conveying pump, observe the reading of the flow meter one, and stabilize the flow rate of the mixture of the conveying fluid and the experimental slurry material in the circulating pipe;

[0056] Step C2, confirm that the lifting pipe is lowered to the lowest position along the guide ring;

[0057] Step C3, open the downflow valve, the first recycling valve and the valve to the % opening;

[0058] Step C4, close the second recovery valve to % valve opening;

[0059] Step C5, observe the reading of the density meter one on the circulating pipeline, run several cycles, when the density reading drops steadily, close the second recovery valve to % valve opening, at this time the experimental slurry material is all along the tangential direction into the sand feeding / recycling hopper through the first recovery valve, under the guide of the guide vane, the experimental slurry material flows along the inner circumference of the sand feeding / recycling hopper, and is uniformly deposited at the bottom of the sand feeding / recycling hopper under the action of gravity, the excess conveying fluid is returned to the circulating pipeline through the hollow lifting pipe and the discharge valve;

[0060] Step C6, observe the reading of the density meter one on the circulating pipeline, run several cycles, when the reading drops steadily, open the second recovery valve to % valve opening, so that the flowing conveying fluid drives the experimental slurry material in the second recovery valve rear pipeline nine to circulate in the circulating pipeline;

[0061] Step C7, observe the reading of the density meter one on the circulating pipeline, when the density value changes from low to high, immediately close the second recovery valve to % valve opening, and recover the experimental slurry material started and run last time to the sand feeding / recycling hopper;

[0062] Step C8, repeat steps C6-C7 several times, when the density value of the experimental slurry material in the circulating pipeline is stable and close to the density of the conveying fluid, completely open the second recovery valve, close the discharge valve and the first recovery valve, and control the conveying pump to stop rotating, the experimental slurry material recovery to the sand feeding / recycling hopper is completed, and the next experiment can be continued;

[0063] The experimental slurry material recovery to the recovery pool process includes the following steps,

[0064] Step D1, adjust the rotating speed of the conveying pump, and observe the reading of the flow meter one to stabilize the flow rate of the conveying fluid in the circulating pipeline;

[0065] Step D2, confirm that the lifting pipe is lowered to the lowest position along the guide ring;

[0066] Step D3, open the fourth recovery valve and the fifth recovery valve to % valve opening;

[0067] Step D4, close the third recovery valve to % valve opening;

[0068] Step D5, observe the reading of the density meter one on the circulating pipeline, run several cycles, when the reading drops steadily, close the third recovery valve to % valve opening, the experimental slurry material is all into the recovery pool through the fourth recovery valve, the experimental slurry material is deposited at the bottom of the recovery pool under the action of gravity, and the conveying fluid is returned to the circulating pipeline through the fifth recovery valve;

[0069] Step D6, observe the reading of the densimeter one on the circulating pipeline, run several cycles, and when the reading is stable, open the third recovery valve to % valve opening, so that the flowing conveying fluid can drive the experimental slurry material in the pipeline eight and pipeline nine after the third recovery valve to circulate in the circulating pipeline;

[0070] Step D7, observe the reading of the densimeter one on the circulating pipeline, and when the density value changes from low to high, immediately close the third recovery valve to % valve opening, and recover the experimental slurry material driven last time to the recovery tank. The water-permeable sand retaining wall in the recovery tank can prevent the recovered experimental slurry material from accumulating to the pipe opening of the pipeline eleven, preventing blockage. In addition, the water-permeable sand retaining wall can allow the upper conveying liquid or the mixture with lower concentration to enter the pipeline eleven, which improves the experimental safety and reduces the recovery time.

[0071] Step D8, repeat steps D6-D7 several times, when the experimental slurry material in the circulating pipeline is stable and close to the density of the conveying fluid, completely open the third recovery valve, close the fourth recovery valve and the fifth recovery valve, and control the conveying pump to stop rotating, and the experimental slurry material is recovered to the recovery tank.

[0072] The device and method for dredging conveying technology research have the following beneficial effects: the device and method for dredging conveying technology research can conveniently add and recover experimental slurry material to the closed circulating pipeline without stopping the conveying pump during the experimental slurry material adding process, the experimental slurry material is continuously added through the lifting of the lifting pipe, the stability of the experimental working condition is ensured, and the experimental efficiency is improved; the guide ring and the slurry isolation sleeve are added to the outer side of the lifting pipe of the sand adding / recovering sand hopper system, the lifting pipe can be lifted or lowered along the guide ring, the stability and centering accuracy of the lifting are ensured; the slurry isolation sleeve isolates the lifting pipe from the experimental slurry material, greatly reduces the adhesion and lateral pressure of the material on the lifting pipe, effectively prevents the deformation or tilting of the lifting pipe, and also greatly reduces the lifting force of the electric winch; a plurality of high-pressure water nozzles are installed on the inclined surface at the bottom of the sand adding / recovering sand hopper, which can effectively disperse the experimental slurry material with high viscosity and high viscosity, further reduce the adhesion between the experimental slurry material and the lifting pipe, and prevent the electric winch from overloading when lifting the material; by controlling the lifting height and lifting time of the lifting pipe, the speed, frequency and volume of the material adding can be effectively controlled, and the real-time observation of the densimeter can be combined, so as to accurately control the concentration value or the change speed of the experimental slurry material in the circulating pipeline;

[0073] During the experiment, according to the experimental measurement needs, a plurality of differential pressure sensors, densitometers, flow meters and other sensing devices are arranged along the conveying pump and the pipeline in the application, and various required experimental data are measured; various sensing data can also be transmitted in real time to the data acquisition system computer through a signal cable, and the data is saved to the computer hard disk, thereby providing guarantee for subsequent experimental data analysis.

[0074] In the experimental mud material recovery process, the sand adding / recovery sand hopper sand hopper system and the recovery tank system constitute a double-redundancy recovery system, and both can independently recover. If any one of the systems is blocked, it can be switched to the other recovery system immediately through the valve, thereby greatly reducing the risk of pipe or pump blockage caused by material recovery. When the material that needs to be repeatedly tested is recovered to the sand adding / recovery sand hopper, since the sand hopper bypass pipe is arranged along the tangent of the outer wall of the hopper, the experimental sand material enters the hopper through the sand hopper bypass pipe and flows along the circumference of the hopper under the driving of the conveying fluid, so that the experimental sand material is uniformly stacked on the periphery of the lifting pipe along the entire taper surface of the hopper, and the thickness is uniform, thereby effectively avoiding the local accumulation of material at the pipe opening of the sand hopper bypass pipe. When the material that needs to be cleaned is recovered to the recovery tank, since the water-permeable sand retaining wall is added in the recovery tank, only the upper conveying fluid or the mixture with low concentration can be allowed to return to the pipeline, and most of the solid material falls into the recovery tank, thereby effectively reducing the recovery time, and the recovery tank is located on the ground, so that the operation area is large and the experimental mud material is easy to clean. BRIEF DESCRIPTION OF DRAWINGS

[0075] Figure 1 is a structural schematic diagram of embodiment 1 of the application.

[0076] Figure 2 is a top view of Figure 1 .

[0077] Figure 3 is a view of A in Figure 1 .

[0078] Figure 4 is a view of B in Figure 1 .

[0079] Figure 5 is a view of C in Figure 1 .

[0080] Figure 6 is a view of E-E in Figure 2 .

[0081] Figure 7 is a view of F in Figure 1 .

[0082] Figure 8 is a structural schematic diagram of embodiment 2 of the application.

[0083] The meanings of the marks in the drawings are as follows:

[0084] 1: sand addition / recycle hopper; 2: hopper bypass pipe; 3: first recycle valve; 4: second recycle valve; 5: circulation pipeline; 5-1: pipeline one; 5-2: pipeline two; 5-3: pipeline three; 5-4: pipeline four; 5-5: pipeline five; 5-6: pipeline six; 5-7: pipeline seven; 5-8: pipeline eight; 5-9: pipeline nine; 5-10: pipeline ten; 5-11: pipeline eleven; 6: delivery pump; 7: discharge valve; 8: discharge pipeline; 9: emptying valve; 10: emptying pipeline; 11: flow meter; 11-1: flow meter one; 11-2: flow meter two; 12: density meter; 12-1: density meter one; 12-2: density meter two; 13: third recycle valve; 14: fourth recycle valve; 15: fifth recycle valve; 16: recycle tank; 17: delivery fluid; 18: experimental slurry material; 19: hoist support beam; 20: lifting electric winch; 21: steel wire rope; 22: lifting pipe; 23: guide ring; 24: guide ring fixing frame; 25: slurry isolation sleeve; 26: slurry isolation sleeve fixing frame; 27: overflow pipe; 28: high-pressure water jet; 30: differential pressure sensor; 30-1: differential pressure sensor one; 30-2: differential pressure sensor two; 30-3: differential pressure sensor three; 30-4: differential pressure sensor four; 31: pressure measuring pipe; 31-1: pressure measuring pipe one; 31-2: pressure measuring pipe two; 31-3: pressure measuring pipe three; 31-4: pressure measuring pipe four; 31-5: pressure measuring pipe five; 31-6: pressure measuring pipe six; 31-7: pressure measuring pipe seven; 31-8: pressure measuring pipe eight; 32: data acquisition system; 34: sand loading box; 34-1: sand loading box one; 34-2: sand loading box two; 34-3: sand loading box three; 34-4: sand loading box four; 35: fixed flange group; 36: water-permeable sand retaining wall; 40: hollow ring; 41: umbrella-shaped dispersion plate; 42: umbrella-shaped dispersion plate support; 50: coupling; 50-1: coupling one; 50-2: coupling two; 51: torque meter; 52: electric motor. DETAILED DESCRIPTION

[0085] The present application will be further described below in conjunction with the drawings of the specification.

[0086] Example 1

[0087] As Figures 1-7 shown, a device for dredging delivery technology research includes a sand hopper system, a recycle tank system, a pipeline delivery system, and a measurement and control system.

[0088] The sand hopper system comprises: a sand feeding / recycling hopper 1, a sand hopper bypass pipe 2, a first recycling valve 3, a second recycling valve 4, a discharging valve 7, a discharging pipe 8, a emptying valve 9, an emptying pipe 10, a conveying fluid 17, an experimental mud material 18, a hoist support beam 19, a lifting electric winch 20, a steel wire rope 21, a lifting pipe 22, a guide ring 23, a guide ring fixing frame 24, a mud isolation sleeve 25, a mud isolation sleeve fixing frame 26, a hollow ring 40, an umbrella-shaped dispersion plate 41, and an umbrella-shaped dispersion plate support 42.

[0089] The recycling pool system comprises: a recycling pool 16, a third recycling valve 13, a fourth recycling valve 14, and a fifth recycling valve 15. The recycling pool system further comprises a water-permeable sand retaining wall 36 located in the recycling pool 16, close to the pipe 11 5-11.

[0090] The pipe conveying system comprises: a circulating pipe 5, a conveying pump 6, a shaft coupling 50, and an electric motor 52. The circulating pipe 5 comprises a pipe 1 5-1, a pipe 2 5-2, a pipe 3 5-3, a pipe 4 5-4, a pipe 5 5-5, a pipe 6 5-6, a pipe 7 5-7, a pipe 8 5-8, a pipe 9 5-9, a pipe 10 5-10, and a pipe 11 5-11. The shaft coupling 50 comprises a shaft coupling 1 50-1 and a shaft coupling 2 50-2.

[0091] The measurement control system comprises: a plurality of flow meters 11, a plurality of density meters 12, a plurality of differential pressure sensors 30, a plurality of pressure measuring pipes 31, and a data acquisition system 32. The plurality of flow meters 11, the plurality of density meters 12, the plurality of differential pressure sensors 30, and the real-time data acquisition system 32 are all installed on the circulating pipe 5. The flow meters 11 comprise a flow meter 1 11-1 and a flow meter 2 11-2. The density meters 12 comprise a density meter 1 12-1 and a density meter 2 12-2. The differential pressure sensors 30 comprise a differential pressure sensor 1 30-1, a differential pressure sensor 2 30-2, a differential pressure sensor 3 30-3, and a differential pressure sensor 4 30-4. The pressure measuring pipes 31 comprise a pressure measuring pipe 1 31-1, a pressure measuring pipe 2 31-2, a pressure measuring pipe 3 31-3, a pressure measuring pipe 4 31-4, a pressure measuring pipe 5 31-5, a pressure measuring pipe 6 31-6, a pressure measuring pipe 7 31-7, and a pressure measuring pipe 8 31-8. The data acquisition system 32 comprises a host computer monitoring computer 32-1, a communication cable 32-2, and a PLC control cabinet 32-3.

[0092] In the sand hopper system, the bottom of the sand feeding / recovering hopper 1 is connected with the pipeline 5-1 and the pipeline 9-5 through the discharging pipeline 8 to form a three-way pipeline; the sand hopper bypass pipe 2 enters the upper part of the sand feeding / recovering hopper 1 and sprays downward through the elbow; the hollow ring 40 is installed at the elbow, the steel wire rope 21 passes through the hollow ring 40, the umbrella-shaped dispersion plate 41 is installed below the hollow ring 40 and is conical, the steel wire rope passes through the hole in the middle of the umbrella-shaped dispersion plate 41, the umbrella-shaped dispersion plate 41 is connected to the sand feeding / recovering hopper 1 through the umbrella-shaped dispersion plate support 42, the sand hopper bypass pipe 2 sprays onto the umbrella-shaped dispersion plate 41 through the elbow after entering the upper part of the sand feeding / recovering hopper 1 to the middle part of the sand feeding / recovering hopper 1, the experimental mud sand material 18 is placed at the bottom of the sand feeding / recovering hopper 1 and is immersed in the conveying fluid 17, the guide ring 23 is arranged inside the sand feeding / recovering hopper 1, the guide ring 23 is connected with the sand feeding / recovering hopper 1 through the guide ring fixing frame 24, the mud sand isolation sleeve 25 is arranged inside the sand feeding / recovering hopper 1, the mud sand isolation sleeve 25 is installed at the lower part of the guide ring 23, the mud sand isolation sleeve 25 is connected with the sand feeding / recovering hopper 1 through the mud sand isolation sleeve fixing frame 26 which is parallel to the upper and lower parts, the guide ring 23 is concentric with the mud sand isolation sleeve 25, the lifting pipe 22 passes through the guide ring 23 and the mud sand isolation sleeve 25, the gap between the guide ring 23 and the lifting pipe 22 is smaller than the gap between the mud sand isolation sleeve 25 and the lifting pipe 22, the lifting pipe 22 is vertically arranged at the center of the sand feeding / recovering hopper 1 and penetrates the guide ring 23 and the mud sand isolation sleeve 25, the lifting pipe 22 is a hollow pipe, the winch support cross beam 19 is fixed at the top of the sand feeding / recovering hopper 1, the lifting electric winch 20 is installed on the winch support cross beam 19, the lifting electric winch 20 is connected with the lifting pipe 22 through the steel wire rope 21 to control the lifting pipe 22 to rise or fall, the first recovering valve 3 is arranged on the sand hopper bypass pipe 2, the second recovering valve 4 is arranged on the pipeline 9-5, the discharging valve 7 is arranged on the discharging pipeline 8, the emptying pipeline 10 is a branch of the discharging pipeline 8, the emptying valve 9 is arranged on the emptying pipeline 10, a plurality of high-pressure nozzles 28 are arranged on the lower conical surface of the sand feeding / recovering hopper 1 in a circle to spray high-pressure water to disperse the hardened and consolidated materials in the sand hopper, the overflow pipe 27 is arranged at the upper end of the side wall of the sand feeding / recovering hopper 1 to discharge the excess water;

[0093] The sand hopper 1 has an opening at the bottom and the diameter is the same as that of the discharging pipe 8, the lifting pipe 22 is a hollow pipe and the diameter is slightly larger than that of the discharging pipe. By controlling the rising and falling of the lifting pipe, the sand injection, interruption and recovery can be realized without stopping the experiment during the experiment:

[0094] Sand injection: lift the lifting pipe 22 to a certain height away from the discharge port at the bottom of the sand pot, and the experimental sand material 18 enters the discharge pipeline 8 under the action of gravity. Open the discharge valve 7, and the sand and water can be injected into the circulating pipeline 5 together. The discharge pipeline 8 is inclined, and the sand can be quickly dispersed and smoothly mixed into the existing slurry in the circulating pipeline after being injected into the circulating pipeline 5.

[0095] Sand injection stop: lower the lifting pipe 22 to the bottom of the sand pot to isolate the experimental sand material 18 from the discharge pipeline 8, so that it cannot enter the discharge port and stop discharging.

[0096] Sand recovery: when the pipeline concentration needs to be reduced or the sand needs to be recovered at the end of the experiment, first lower the lifting pipe 22 to the bottom of the sand pot to isolate the sand from the discharge pipeline, then open the first recovery valve 3 and the discharge valve 7, and close the second recovery valve 4. At this time, the water and sand mixture in the circulating pipeline enters the sand addition / recycling sand pot 1 through the bypass composed of the sand pot bypass pipe 2 and the first recovery valve 3. The experimental sand material 18 naturally deposits in the sand pot due to the sudden reduction in flow rate, and the water and sand are separated. The muddy water reenters the circulating pipeline 5 through the discharge pipeline 8 from the lifting pipe 22, maintaining the continuity of the flow, achieving simple, fast, and continuous sand and water separation and recovery. The sand recovered into the sand pot can be directly added to the pipeline for reuse, which is very convenient.

[0097] In the recycling pool system, the third recovery valve 13 is arranged on the pipeline eight 5-8, the fourth recovery valve 14 is arranged on the pipeline ten 5-10, the fifth recovery valve 15 is arranged on the pipeline eleven 5-11, one end of the recycling pool 16 communicates with the pipeline ten 5-10 through the fourth recovery valve 14, and the other end communicates with the pipeline eleven 5-11 through the fifth recovery valve 15; the pipeline ten 5-10, the fourth recovery valve 14, the recycling pool 16, the fifth recovery valve 15 and the pipeline eleven 5-11 constitute a fluid channel for recycling sand in the recycling pool;

[0098] In the pipeline delivery system and measurement and control system, the delivery pump 6 and the motor 52 are connected through coupling 50-1, torque meter 51 and coupling 50-2. The right end of the pipeline 5-1 is connected to the suction end of the delivery pump 6, and the output end of the delivery pump 6 is connected to the pipeline 5-2. Pressure measuring tubes 31-1 and 31-2 are installed on pipes 5-1 and 5-2, respectively. These tubes are connected to differential pressure sensor 30-1. The lower end of flow meter 11-1 is connected to pipe 5-2, and the upper end is connected to pipe 5-3. Differential pressure sensor 30-2 is installed on pipe 5-3. Differential pressure sensor 11-2 is connected to pipe 5-3 via pressure measuring tubes 31-3 and 31-4. Pipe 4 5-4 connects to pipes 5-3 and 5-5 via an elbow. Differential pressure sensor 30-3 is installed on pipe 5-5. Differential pressure sensor 30-3 is connected to pipe 5-5 via pressure measuring tubes 31-5 and 31-6. A density meter 12-1 is installed on pipe 5-5, and a density meter 2 12-2 is installed on pipe 6-6. The right side of the flow meter 2 11-2 is connected to pipe 6-6, and the left side is connected to pipe 7-7. A differential pressure sensor 4 30-4 is installed on pipe 7, and it is connected to pipe 7-7 through pressure measuring pipe 7 31-7 and pressure measuring pipe 8 31-8. Pipe 7-5-7, pipe 8-8, and pipe 10-5-10 form a three-way pipe. Pipe 10-5-10 is connected to one end of the recovery tank 16. The other end of the recovery tank 16 is connected to the middle section of pipe 1-5-1 through pipe 11-5-11, forming a three-way pipe with pipe 1-5-1. Pipe 8-5-8 is connected to pipe 9-5-9 and sand hopper bypass pipe 2, forming a three-way pipe.

[0099] Example 2:

[0100] like Figure 8 As shown, the permeable sand retaining wall 36 in the above-mentioned recycling pool system is replaced by several sand-filling boxes 34, including sand-filling box one 34-1, sand-filling box two 34-2, sand-filling box three 34-3 and sand-filling box four 34-4. The sand-filling boxes one 34-1, sand-filling box two 34-2, sand-filling box three 34-3 and sand-filling box four 34-4 are all placed at the bottom of the recycling pool 16. The pipeline 10 5-10 extending into the recycling pool 16 has four branches, which lead to sand-filling box one 34-1, sand-filling box two 34-2, sand-filling box three 34-3 and sand-filling box four 34-4 respectively. The end of the pipeline 10 5-10 is connected to the pipeline 12 5-12 through a fixed flange assembly 35, and the other end of the pipeline 12 5-12 is connected to the recycling pool 16.

[0101] Preferably, a plurality of high-pressure nozzles 28 are arranged circumferentially on the lower conical surface of the sand bucket system in embodiments 1 and 2 above.

[0102] Preferably, a stroke sensor is arranged above the lifting pipe 22 in the above-mentioned embodiments 1 and 2 to detect the current height of the lifting pipe 22. The lifting pipe stroke can be detected in real time, so as to obtain the size of the space above the discharge port and control the speed and amount of sand of the discharging.

[0103] Preferably, the discharging pipe 8 in the above-mentioned embodiments 1 and 2 is arranged obliquely and forms an angle of 60 degrees with the pipe 5-1. The oblique direction is consistent with the flow direction of the slurry in the pipe.

[0104] Preferably, the mud and sand isolation sleeve fixing frame 26 in the above-mentioned embodiments 1 and 2 is two-layered.

[0105] The sand hopper system and the recovery tank system constitute a one-to-one backup double-redundancy mud and sand recovery system. When one set of system cannot normally recover due to failure such as stuck recovery valve, the system can be quickly switched to another set of recovery system without shutdown, effectively avoiding the great trouble caused by forced shutdown due to failure to recover, such as pipe blockage, pump blockage and a series of failures to experimental work.

[0106] The guide ring 23 is concentric with the mud and sand isolation sleeve 25, and the guide ring 23 is located at the upper part of the mud and sand isolation sleeve. The lifting pipe 22 passes through the guide ring 23 and the mud and sand isolation sleeve 25. The mud and sand isolation sleeve 25 can bear most of the earth pressure in the sand adding / recovery hopper 1, effectively avoiding the problem that the lifting pipe 22 cannot be lifted out when the dense sand material is directly accumulated around the lifting pipe 22, making the lifting and lowering of the lifting pipe 22 more flexible, and the two-way regulation of mud and sand injection, recovery, and concentration increase and decrease very convenient.

[0107] After a long time of experimental operation, the water temperature in the circulating pipe 5 increases, and the fluid viscosity increases, which will affect the measurement accuracy and the service life of the instrument. At this time, the first recovery valve 3 and the discharging valve 7 can be slightly opened, so that part of the muddy water in the circulating pipe 5 enters the sand hopper through the bypass composed of the sand hopper bypass pipe 2 and the first recovery valve 3, and part of the cold water in the sand hopper returns to the circulating pipe through the lifting pipe 22 to participate in the circulation. After a period of time, the pipe can be obviously cooled.

[0108] The sand hopper bypass pipe 2 is connected to the upper part of the sand adding / recovery hopper 1. The above-mentioned tangential guide groove 29 is installed in the inside of the sand adding / recovery hopper 1 at the pipe opening where the sand hopper bypass pipe 2 enters the sand adding / recovery hopper 1. After the experimental mud and sand material 18 enters along the tangential guide groove 29, it can quickly rotate along the inner wall of the sand adding / recovery hopper 1, so that the mud and sand are uniformly distributed around the sand hopper, effectively avoiding the accumulation of mud and sand at the outlet of the sand hopper bypass pipe 2.

[0109] The recovery pool 16 is low in elevation and spacious, with a large working area and easy to clean, and the water-permeable sand retaining wall 34 is installed in the recovery pool 16, close to the pipeline 11-5-11; the water-permeable sand retaining wall 34 has the water-permeable sand retaining function, and it is convenient to use the submersible pump and other equipment to quickly drain the recovery pool 16.

[0110] A method for dredging conveying technology research uses the above device, including experimental mud material adding process, conveying experiment process, experimental mud material recycling to sand adding / recycling sand hopper process and experimental mud material recycling to recovery pool process;

[0111] The experimental mud material adding process includes the following steps,

[0112] Step A1, open the first recovery valve 3, the second recovery valve 4, the third recovery valve 13, the fourth recovery valve 14, the fifth recovery valve 15, and the discharge valve 7, close the emptying valve 9, and raise the lifting pipe 22 along the guide ring 23 by the lifting electric winch 20, fill the circulating pipeline 5, the sand adding / recycling sand hopper 1, the recovery pool 16 and the like with the conveying fluid 17, wherein the height of the conveying fluid in the sand adding / recycling sand hopper 1 must reach the overflow pipe 27;

[0113] Step A2, lower the lifting pipe 22 along the guide ring 23 to the lowest position by the lifting electric winch 20, and isolate the bottom of the sand adding / recycling sand hopper 1 from the discharge pipeline 8;

[0114] Step A3, weigh the experimental mud material 18 on the ground, so as to calculate the volume of the added experimental mud material;

[0115] Step A4, load the experimental mud material 18 into the sand adding / recycling sand hopper 1 by the conveyor belt or the loader, so that the experimental mud material 18 is immersed in the conveying fluid 17;

[0116] Step A5, close the discharge valve 7, and then close the first recovery valve 3, the fourth recovery valve 14, and the fifth recovery valve 15;

[0117] Step A6, start the conveying pump 6, adjust the rotating speed of the conveying pump 6, and record the reading of the flow meter 11, so that the conveying fluid 17 flows in the circulating pipeline 5 at a constant speed;

[0118] Step A7, open the discharge valve 7;

[0119] Step A8, connect the high-pressure water to each high-pressure water jet 28, and spray the high-pressure water into the interior of the sand adding / recycling sand hopper 1 to disperse the experimental mud material 18;

[0120] Step A9, start lifting the lifting pipe 22 by the lifting electric winch 20, connect the bottom of the sand adding / recycling hopper 1 with the feeding pipeline 8, observe the reading of the densimeter 12-1, after the value of the densimeter 12-1 is stable, record the concentration of the experimental slurry material 18 in the circulating pipeline 5, if the concentration does not reach the required concentration, continue to add the experimental slurry material 18 by lifting the lifting pipe 22 by the lifting electric winch 20, to increase the concentration, until the concentration of the experimental slurry material 18 reaches the required concentration. By changing the height of the lifting pipe 22, the opening of the bottom of the sand adding / recycling hopper 1 can be changed, so that the feeding speed can be adjusted in real time;

[0121] Step A10, further lower the lifting pipe 22 along the guide ring 24 to the lowest position by the lifting electric winch 20, isolate the bottom of the sand adding / recycling hopper 1 from the feeding pipeline 8, close the feeding valve 7, and the addition of the experimental slurry material 11 is completed;

[0122] Step A11, if multiple concentrations are required in the experiment, steps A8-A10 can be repeated multiple times to meet the experimental requirements;

[0123] The conveying experiment process comprises the following steps,

[0124] Step B1, observe the value of the densimeter 12-1 on the circulating pipeline 5, when the average concentration is near the measured concentration and is stable, record the values of the densimeter 12-1 on the vertical pipeline and the densimeter 12-2 on the horizontal pipeline in real time;

[0125] Step B2, record the values of the flowmeter 11-1 on the vertical pipeline and the flowmeter 11-2 on the horizontal pipeline in real time while recording the value of the densimeter 12-1 in real time;

[0126] Step B3, record the values of the differential pressure sensor 30-1 at the pump inlet and the differential pressure sensor 30-4 on the horizontal pipeline, etc. in real time while recording the value of the densimeter 12-1 in real time;

[0127] Step B4, record the value of the torque meter 51 in real time while recording the value of the densimeter 12-1 in real time;

[0128] Step B5, repeat steps B1-B4 for different measured concentrations;

[0129] The process of recycling the experimental slurry material to the sand adding / recycling hopper comprises the following steps,

[0130] Step C1, adjust the speed of the conveying pump 6, observe the reading of the flowmeter 11-1, and stabilize the flow rate of the mixture of the conveying fluid 17 and the experimental slurry material 18 in the circulating pipeline 5;

[0131] Step C2, confirm the lowering pipe 22 along the guide ring 23 to the lowest position;

[0132] Step C3, open the blanking valve 7, the first recovery valve 3 to 100% valve opening;

[0133] Step C4, close the second recovery valve 4 to 50% valve opening;

[0134] Step C5, observe the reading of the densimeter 12-1 on the circulating pipeline 5, run several cycles, when the density reading is stable, close the second recovery valve 4 to 0% valve opening, at this time the experimental mud material 18 is all through the first recovery valve 3 into the sand adding / recycling hopper 1 along the tangent, under the guide of the tangent guide groove 29, the experimental mud material 18 flows along the inner circumference of the sand adding / recycling hopper 1, and is uniformly deposited on the bottom of the sand adding / recycling hopper 1 under the action of gravity, the excess conveying fluid 17 is returned to the circulating pipeline 5 through the hollow lifting pipe 22 and the blanking valve 7;

[0135] Step C6, observe the reading of the densimeter 12-1 on the circulating pipeline 5, run several cycles, when the reading is stable, open the second recovery valve 4 to 50% valve opening, so that the flowing conveying fluid 17 drives the experimental mud material 18 in the pipeline 5-9 behind the second recovery valve 4 to circulate in the circulating pipeline 5;

[0136] Step C7, observe the reading of the densimeter 12-1 on the circulating pipeline 5, when the density value changes from low to high, immediately close the second recovery valve 4 to 0% valve opening, and recover the experimental mud material 18 in the last start-up operation to the sand adding / recycling hopper 1;

[0137] Step C8, repeat steps C6-C7 several times, when the density value of the experimental mud material 18 in the circulating pipeline 5 is stable and close to the density of the conveying fluid 17, completely open the second recovery valve 4, close the blanking valve 7 and the first recovery valve 3, and stop the rotation of the conveying pump 6, so as to end the recovery of the experimental mud material 18 to the sand adding / recycling hopper, and facilitate the next experiment;

[0138] The process of recovering the experimental mud material to the recovery tank includes the following steps,

[0139] Step D1, adjust the rotation speed of the conveying pump 6, and observe the reading of the flowmeter 11-1 to stabilize the flow rate of the conveying fluid 17 in the circulating pipeline 5;

[0140] Step D2, confirm the lowering pipe 22 along the guide ring 23 to the lowest position;

[0141] Step D3, open the fourth recovery valve 14 and the fifth recovery valve 15 to 100% valve opening;

[0142] Step D4, close the third recovery valve 13 to 50% valve opening;

[0143] Step D5, observe the reading of the densimeter 12-1 on the circulating pipeline 5, run several cycles, when the reading is stable, close the third recovery valve 13 to 0% valve opening, the experimental slurry 18 is all recycled through the fourth recovery valve 14 into the recovery tank 16, the experimental slurry 18 is deposited at the bottom of the recovery tank 16 under the action of gravity, and the conveying fluid 17 is recycled into the circulating pipeline 5 through the fifth recovery valve 15;

[0144] Step D6, observe the reading of the densimeter 12-1 on the circulating pipeline 5, run several cycles, when the reading is stable, open the third recovery valve 13 to 50% valve opening, so that the flowing conveying fluid 17 drives the experimental slurry 18 in the pipeline eight 5-8 and the pipeline nine 5-9 behind the third recovery valve 13 to circulate in the circulating pipeline 5;

[0145] Step D7, observe the reading of the densimeter 12-1 on the circulating pipeline 5, when the density value changes from low to high, immediately close the third recovery valve 13 to 0% valve opening, and recycle the experimental slurry 18 driven in the last cycle into the recovery tank 16, the water-permeable sand retaining wall 34 in the recovery tank 16 can prevent the recycled experimental slurry 18 from accumulating to the pipe opening of the pipeline eleven 5-11, so as to prevent blockage, in addition, the water-permeable sand retaining wall 34 can allow the upper conveying fluid 17 or the mixture with low concentration to enter the pipeline eleven 5-11, which improves the safety of the experiment and reduces the recycling time;

[0146] Step D8, repeat steps D6-D7 several times, when the density value of the experimental slurry 18 in the circulating pipeline 5 is stable and close to the density of the conveying fluid 17, completely open the third recovery valve 13, close the fourth recovery valve 14 and the fifth recovery valve 15, and control the conveying pump 6 to stop rotating, and the recycling of the experimental slurry 18 into the recovery tank is completed.

[0147] In summary, the beneficial effects of the present application are: the device and method for dredging conveying technology research can conveniently add and recover experimental sand material to the closed circulating pipeline under the condition of not stopping the conveying pump during the experimental sand material adding process, the continuous addition of experimental sand material is realized through the lifting of the lifting pipe, the stability of the experimental working condition is ensured, and the experimental efficiency is improved; the lifting pipe of the sand adding / recovery sand hopper system is provided with a guide ring and a sand isolation sleeve on the outer side of the lifting pipe, the lifting pipe can be lifted or lowered along the guide ring, and the stability and centering accuracy of the lifting pipe are ensured; the sand isolation sleeve isolates the lifting pipe from the experimental sand material, greatly reduces the adhesion and lateral pressure of the material on the lifting pipe, effectively prevents the deformation or tilting of the lifting pipe, and also greatly reduces the lifting force of the electric winch; a plurality of high-pressure water nozzles are installed on the inclined surface at the bottom of the sand adding / recovery sand hopper, which can effectively disperse the experimental sand material which is prone to hardening and has high viscosity, further reduces the adhesion between the experimental sand material and the lifting pipe, and prevents the electric winch from being overloaded when lifting the material; by controlling the lifting height and lifting time of the lifting pipe, the speed, frequency and volume of the material adding can be effectively controlled, and the concentration value or concentration change rate of the experimental sand material in the circulating pipeline can be accurately controlled through the real-time observation of the densimeter;

[0148] During the experiment, a plurality of differential pressure sensors, densimeters, flow meters and other sensing devices are arranged along the conveying pump and the pipeline according to the experimental measurement needs, and various types of experimental data are measured; the sensing data can also be transmitted to the data acquisition system computer in real time through the signal cable, and the data is saved to the computer hard disk, thereby providing a guarantee for subsequent experimental data analysis.

[0149] During the experimental sand material recovery process, the sand adding / recovery sand hopper system and the recovery tank system form a double-redundancy recovery system, and any one of the systems can be independently recovered, and if any one of the systems is blocked, the system can be switched to the other recovery system through the valve, thereby greatly reducing the risk of pipe or pump blockage caused by material recovery; when the material needs to be repeatedly tested and is recovered to the sand adding / recovery sand hopper, since the sand hopper bypass pipe is arranged along the tangent of the outer wall of the funnel, the experimental sand material enters the funnel through the sand hopper bypass pipe and flows along the circumference of the funnel under the driving of the conveying fluid, so that the experimental sand material is uniformly stacked around the lifting pipe along the entire conical surface of the funnel, the thickness is uniform, and local accumulation of the material at the pipe opening of the sand hopper bypass pipe is effectively avoided; when the material needs to be cleaned and is recovered to the recovery tank, since the water-permeable sand retaining wall is added in the recovery tank, only the upper conveying fluid or the mixture with low concentration can be allowed to return to the pipeline, and most of the solid material falls into the recovery tank, thereby effectively reducing the recovery time, and the recovery tank is located on the ground, the working area is large, and the experimental sand material is easy to clean.

[0150] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An apparatus for research on dredging and conveying technology, characterized in that... include: Sand hopper system, recovery tank system, pipeline transportation system, and measurement and control system; The sand hopper system includes: a sand adding / recovery hopper (1), a sand hopper bypass pipe (2), a first recovery valve (3), a second recovery valve (4), a discharge valve (7), a discharge pipeline (8), a drain valve (9), a drain pipeline (10), a conveying fluid (17), experimental mud and sand material (18), a winch support beam (19), an electric lifting winch (20), a wire rope (21), a lifting pipe (22), a guide ring (23), a guide ring fixing frame (24), a mud and sand isolation sleeve (25), a mud and sand isolation sleeve fixing frame (26), a hollow ring (40), an umbrella-shaped dispersion plate (41), and an umbrella-shaped dispersion plate support (42). The recycling pool system includes: a recycling pool (16), a third recycling valve (13), a fourth recycling valve (14), and a fifth recycling valve (15). The pipeline conveying system includes: a circulation pipeline (5), a conveying pump (6), a coupling (50), and a motor (52); the circulation pipeline (5) includes pipeline one (5-1), pipeline two (5-2), pipeline three (5-3), pipeline four (5-4), pipeline five (5-5), pipeline six (5-6), pipeline seven (5-7), pipeline eight (5-8), pipeline nine (5-9), pipeline ten (5-10), and pipeline eleven (5-11); the coupling (50) includes coupling one (50-1) and coupling two (50-2); The measurement and control system includes several flow meters (11), densitometers (12), differential pressure sensors (30), pressure measuring tubes (31), and a data acquisition system (32); the flow meters (11), densitometers (12), differential pressure sensors (30), and real-time data acquisition system (32) are all installed on the circulation pipeline (5); the flow meters (11) include flow meter one (11-1) and flow meter two (11-2), the densitometers (12) include densitometer one (12-1) and densitometer two (12-2); the differential pressure sensors (30) include differential pressure sensor one. (30-1), differential pressure sensor 2 (30-2), differential pressure sensor 3 (30-3), differential pressure sensor 4 (30-4); the pressure measuring tube (31) includes pressure measuring tube 1 (31-1), pressure measuring tube 2 (31-2), pressure measuring tube 3 (31-3), pressure measuring tube 4 (31-4), pressure measuring tube 5 (31-5), pressure measuring tube 6 (31-6), pressure measuring tube 7 (31-7), and pressure measuring tube 8 (31-8); the data acquisition system (32) includes a host computer (32-1), a communication cable (32-2), and a PLC control cabinet (32-3); In the sand hopper system, the bottom of the sand adding / recovering sand hopper (1) is connected to pipe one (5-1) and pipe nine (5-9) through the discharge pipe (8) to form a three-way pipe; the sand hopper bypass pipe (2) enters from the upper part of the sand adding / recovering sand hopper (1) until the middle of the sand adding / recovering sand hopper (1), and sprays downward through the elbow; the hollow ring (40) is installed at the elbow, the wire rope (21) passes through the hollow ring (40), the umbrella-shaped dispersion plate (41) is installed below the hollow ring (40), and is conical in shape. The wire rope passes through the hole in the middle of the umbrella-shaped dispersion plate (41), and the umbrella-shaped dispersion plate (41) is connected to the sand adding / recovering sand hopper (1) through the umbrella-shaped dispersion plate support (42). The sand hopper bypass pipe (2) passes through the upper part of the sand hopper (1) and extends to the middle part of the sand hopper (1). After passing through the elbow, it is sprayed onto the umbrella-shaped dispersion plate (41). The experimental mud and sand material (18) is placed at the bottom of the sand hopper (1) and immersed in the conveying fluid (17). The guide ring (23) is set inside the sand hopper (1). The guide ring (23) is connected to the sand hopper (1) through several guide ring fixing brackets (24). The mud and sand isolation sleeve (25) is set inside the sand hopper (1). The mud and sand isolation sleeve (25) is installed on the guide ring. At the lower part of (23), the mud and sand isolation sleeve (25) is connected to the sand adding / recovering sand hopper (1) through several mud and sand isolation sleeve fixing frames (26) that are parallel to each other. The guide ring (23) is concentric with the mud and sand isolation sleeve (25). The lifting pipe (22) passes through the guide ring (23) and the mud and sand isolation sleeve (25). The gap between the guide ring (23) and the lifting pipe (22) is smaller than the gap between the mud and sand isolation sleeve (25) and the lifting pipe (22). The lifting pipe (22) is vertically set at the center of the sand adding / recovering sand hopper (1) and passes through the guide ring (23) and the mud and sand isolation sleeve (25). The lifting pipe (22) is a hollow pipe. The winch support beam (19) is fixed on the top of the sand adding / recovering sand hopper (1). The lifting electric winch (20) is installed on the winch support beam (19). The lifting electric winch (20) is linked with the lifting pipe (22) through the wire rope (21) to control the lifting pipe (22) to rise or fall. The first recovery valve (3) is set on the sand hopper bypass pipe (2). The second recovery valve (4) is set on the pipeline nine (5-9). The discharge valve (7) is set on the discharge pipeline (8). The drain pipeline (10) is a branch of the discharge pipeline (8). The drain valve (9) is set on the drain pipeline (10). In the recycling pool system, the third recycling valve (13) is installed on pipeline eight (5-8), the fourth recycling valve (14) is installed on pipeline ten (5-10), and the fifth recycling valve (15) is installed on pipeline eleven (5-11). One end of the recycling pool (16) is connected to pipeline ten (5-10) through the fourth recycling valve (14), and the other end is connected to pipeline eleven (5-11) through the fifth recycling valve (15). Pipeline ten (5-10), the fourth recycling valve (14), the recycling pool (16), the fifth recycling valve (15), and pipeline eleven (5-11) constitute the fluid channel for recycling sand in the recycling pool. In the pipeline delivery system and measurement and control system, the delivery pump (6) and the motor (52) are connected via coupling one (50-1), torque meter (51) and coupling two (50-2). The right end of pipeline one (5-1) is connected to the suction end of the delivery pump (6), and the output end of the delivery pump (6) is connected to pipeline two (5-2). Pressure measuring tube one (31-1) and pressure measuring tube two (31-2) are installed on pipeline one (5-1) and pipeline two (5-2), and pressure measuring tube one (31-1) and pressure measuring tube two (31-2) are connected to... On differential pressure sensor one (30-1), the lower end of flow meter one (11-1) is connected to pipe two (5-2), and the upper end is connected to pipe three (5-3). Differential pressure sensor two (30-2) is installed on pipe three (5-3). Differential pressure sensor two (11-2) is connected to pipe three (5-3) through pressure measuring pipe three (31-3) and pressure measuring pipe four (31-4). Pipe four (5-4) is connected to pipe three (5-3) and pipe five (5-5) through an elbow. Differential pressure sensor is installed on pipe five (5-5). Sensor 3 (30-3) is connected to pipeline 5 (5-5) via pressure measuring tube 5 (31-5) and pressure measuring tube 6 (31-6). A density meter 1 (12-1) is installed on pipeline 5 (5-5), and a density meter 2 (12-2) is installed on pipeline 6 (5-6). The right side of flow meter 2 (11-2) is connected to pipeline 6 (5-6), and the left side is connected to pipeline 7 (5-7). A differential pressure sensor 4 (30-4) is installed on pipeline 7, connected to pressure measuring tube 7 (31-5) via pressure measuring tube 6 (31-5) and pressure measuring tube 6 (31-6). -7) and pressure measuring pipe eight (31-8) are connected to pipe seven (5-7). Pipe seven (5-7) forms a three-way pipe with pipe eight (5-8) and pipe ten (5-10). Pipe ten (5-10) is connected to one end of the recovery pool (16). The other end of the recovery pool (16) is connected to the middle section of pipe one (5-1) through pipe eleven (5-11), forming a three-way pipe with pipe one (5-1). Pipe eight (5-8) is connected to pipe nine (5-9) and sand hopper bypass pipe (2), forming a three-way pipe.

2. The apparatus for dredging and conveying technology research according to claim 1, characterized in that: The recycling pool system also includes a permeable sand retaining wall (36), which is located inside the recycling pool (16) near pipe eleven (5-11).

3. The apparatus for dredging and conveying technology research according to claim 1, characterized in that: The recycling pool system also includes several sand-filling boxes (34), including sand-filling box one (34-1), sand-filling box two (34-2), sand-filling box three (34-3) and sand-filling box four (34-4). The sand-filling boxes one (34-1), sand-filling box two (34-2), sand-filling box three (34-3) and sand-filling box four (34-4) are all placed at the bottom of the recycling pool (16). The pipeline ten (5-10) has four branches extending into the recycling pool (16), which lead to sand-filling box one (34-1), sand-filling box two (34-2), sand-filling box three (34-3) and sand-filling box four (34-4) respectively. The end of the pipeline ten (5-10) is connected to the pipeline twelve (5-12) through a fixed flange assembly (35), and the other end of the pipeline twelve (5-12) is connected to the recycling pool (16).

4. The apparatus for dredging and conveying technology research according to claim 1, characterized in that: Several high-pressure nozzles (28) are arranged circumferentially on the lower conical surface of the sand hopper system to spray high-pressure water and disperse the hardened and hardened material in the sand hopper.

5. The apparatus for dredging and conveying technology research according to claim 1, characterized in that: The upper side wall of the sand adding / recovery hopper (1) is also provided with an overflow pipe (27) to discharge excess water.

6. The apparatus for dredging and conveying technology research according to claim 1, characterized in that: A stroke sensor is installed above the lifting tube (22) to measure the current height of the lifting tube (22).

7. The apparatus for dredging and conveying technology research according to claim 1, characterized in that: The feeding pipe (8) is inclined and forms a 60-degree angle with pipe one (5-1).

8. The apparatus for dredging and conveying technology research according to claim 1, characterized in that: The mud and sand isolation sleeve fixing frame (26) consists of two layers, upper and lower.

9. A method for research on dredging and conveying technology, characterized in that... The apparatus according to any one of claims 1-6 is used, including a process for adding experimental mud and sand materials, a process for conveying experimental materials, a process for recovering experimental mud and sand materials to a sand addition / recovery hopper, and a process for recovering experimental mud and sand materials to a recovery pool. The experimental mud and sand material addition process includes the following steps: Step (A1): Open the first recovery valve (3), the second recovery valve (4), the third recovery valve (13), the fourth recovery valve (14), the fifth recovery valve (15), and the discharge valve (7), close the vent valve (9), and lift the lifting pipe (22) along the guide ring (23) using the lifting electric winch (20) to fill the circulation pipe (5), sand adding / recovery sand hopper (1), recovery pool (16), etc. with the conveying fluid (17). The height of the conveying fluid in the sand adding / recovery sand hopper (1) must reach the overflow pipe (27). Step (A2): The lifting pipe (22) is lowered to the lowest position along the guide ring (23) by the lifting electric winch (20) to isolate the bottom of the sand adding / recycling hopper (1) from the discharge pipe (8); Step (A3): Weigh the experimental mud and sand material (18) to be added on the ground to calculate the volume of the added experimental mud and sand material. Step (A4): The experimental mud and sand material (18) is loaded into the sand addition / recovery hopper (1) by a conveyor belt or loader, so that the experimental mud and sand material (18) is immersed in the conveying fluid (17); Step (A5): Close the discharge valve (7), and then close the first recovery valve (3), the fourth recovery valve (14), and the fifth recovery valve (15); Step (A6): Start the transfer pump (6) and adjust the speed of the transfer pump (6), record the reading of the flow meter (11), and make the transfer fluid (17) flow in the circulation pipeline (5) at a constant speed; Step (A7): Open the discharge valve (7); Step (A8): Connect each high-pressure water nozzle (28) to high-pressure water and inject high-pressure water into the interior of the sand addition / recovery sand hopper (1) to disperse the experimental mud and sand material (18). Step (A9): Start the lifting electric winch (20) to lift the lifting pipe (22), connect the bottom of the sand adding / recovering sand hopper (1) to the discharge pipe eight (8) to discharge the material, observe the reading of the densitometer one (12-1) at this time, and after the value of the densitometer one (12-1) stabilizes, record the concentration of the experimental mud and sand material (18) in the circulation pipe five (5). If the concentration required for the experiment is not reached, lift the lifting pipe (22) again by lifting the electric winch (20) to continue adding the experimental mud and sand material (18) to increase the concentration until the concentration of the experimental mud and sand material (18) reaches the concentration required for the experiment. By changing the height of the lifting pipe (22), the opening degree with the bottom of the sand adding / recovering sand hopper (1) can be changed, thereby adjusting the discharge speed in real time. Step (A10): Then, using the electric winch (20), lower the lifting pipe (22) along the guide ring (24) to the lowest position, isolate the bottom of the sand adding / recovering sand hopper (1) from the discharge pipe (8), close the discharge valve (7), add experimental mud and sand material (11), and the work is completed. Step (A11): If multiple concentrations are required in the experiment, steps (A8)-(A10) can be repeated multiple times to meet the experimental requirements. The delivery experiment process includes the following steps: Step (B1): Observe the value of the first densitometer (12-1) on the circulation pipeline (5). After the average concentration is close to the measured concentration and stabilizes, record the values ​​of the first densitometer (12-1) on the vertical pipeline and the second densitometer (12-2) on the horizontal pipeline in real time. Step (B2): While recording the value of density meter 1 (12-1) in real time, record the values ​​of flow meter 1 (11-1) on the vertical pipe and flow meter 2 (11-2) on the horizontal pipe in real time. Step (B3): While recording the value of density meter 1 (12-1) in real time, record the values ​​of differential pressure sensor 1 (30-1) at the pump inlet and outlet and differential pressure sensor 4 (30-4) on the horizontal pipeline in real time. Step (B4) records the value of the density meter (12-1) in real time, and simultaneously records the value of the torque meter (51) in real time; For different measured concentrations, repeat steps (B1)-(B4). The process of recovering the experimental mud and sand material to the sand addition / recovery hopper includes the following steps. Step (C1): Adjust the speed of the delivery pump (6) and observe the reading of the flow meter (11-1) to stabilize the flow rate of the mixture of the delivery fluid (17) and the experimental mud and sand material (18) in the circulation pipeline (5). Step (C2): Confirm that the lifting tube (22) is lowered to the lowest position along the guide ring (23); Step (C3): Open the discharge valve (7) and the first recovery valve (3) to 100% valve opening. Step (C4): Close the second recovery valve (4) to 50% valve opening; Step (C5): Observe the reading of the density meter 1 (12-1) on the circulation pipeline (5), run several cycles, and when the density reading drops and stabilizes, close the second recovery valve (4) to 0% valve opening. At this time, all the experimental mud and sand material (18) enters the sand addition / recovery sand hopper (1) tangentially through the first recovery valve (3). Under the guidance of the tangential guide channel (29), the experimental mud and sand material (18) flows along the inner circumference of the sand addition / recovery sand hopper (1) and is uniformly deposited at the bottom of the sand addition / recovery sand hopper (1) under the action of gravity. The excess conveying fluid (17) returns to the circulation pipeline (5) through the hollow riser pipe (22) and the discharge valve (7). Step (C6): Observe the reading of the densitometer 1 (12-1) on the circulation pipeline (5), run several cycles, and after the reading drops and stabilizes, open the second recovery valve (4) to 50% valve opening, so that the flowing conveying fluid (17) can drive the experimental mud and sand material (18) in the pipeline 9 (5-9) after the second recovery valve (4) to circulate in the circulation pipeline (5); Step (C7): Observe the reading of the density meter 1 (12-1) on the circulation pipeline (5). When the density value changes from low to high, immediately close the second recovery valve (4) to 0% valve opening and recover the experimental mud and sand material (18) from the previous start-up operation into the sand addition / recovery sand hopper (1). Step (C8), repeat steps (C6)-(C7) several times. When the density value of the experimental mud and sand material (18) in the circulation pipeline (5) stabilizes and approaches the density of the conveying fluid (17), fully open the second recovery valve (4), close the discharge valve (7) and the first recovery valve (3), control the conveying pump (6) to stop rotating, and recover the experimental mud and sand material (18) to the sand addition / recovery hopper to finish, so that the experiment can continue next time. The process of recovering the experimental mud and sand material to the recovery tank includes the following steps. Step (D1): Adjust the speed of the delivery pump (6) and observe the reading of the flow meter (11-1) to stabilize the flow rate of the delivery fluid (17) in the circulation pipeline (5); Step (D2): Confirm that the lifting tube (22) is lowered to the lowest position along the guide ring (23); Step (D3): Open the fourth recovery valve (14) and the fifth recovery valve (15) to 100% valve opening. Step (D4): Close the third recovery valve (13) to 50% valve opening; Step (D5): Observe the reading of the densitometer 1 (12-1) on the circulation pipeline (5), run several cycles, and when the reading drops and stabilizes, close the third recovery valve (13) to 0% valve opening. All the mud and sand material (18) in this experiment enters the recovery tank (16) through the fourth recovery valve (14). The mud and sand material (18) is deposited at the bottom of the recovery tank (16) under the action of gravity. The transport fluid (17) returns to the circulation pipeline (5) through the fifth recovery valve (15). Step (D6): Observe the reading of the densitometer 1 (12-1) on the circulation pipeline (5), run several cycles, and after the reading drops and stabilizes, open the third recovery valve (13) to 50% valve opening, so that the flowing conveying fluid (17) can drive the experimental mud and sand material (18) in the downstream pipeline 8 (5-8) and pipeline 9 (5-9) of the third recovery valve (13) to circulate in the circulation pipeline (5); Step (D7): Observe the reading of the first densitometer (12-1) on the circulation pipeline (5). When the density value changes from low to high, immediately close the third recovery valve (13) to 0% valve opening and recover the experimental mud and sand material (18) that was driven up last time to the recovery tank (16). The permeable sand retaining wall (34) in the recovery tank (16) can prevent the recovered experimental mud and sand material (18) from accumulating at the pipe opening of pipeline eleven (5-11) to prevent blockage. In addition, the permeable sand retaining wall (34) can allow the upper transport liquid (17) or a mixture with a lower concentration to enter pipeline eleven (5-11), which improves experimental safety and reduces recovery time. Step (D8), repeat steps (D6)-(D7) several times. When the density value of the experimental mud and sand material (18) in the circulation pipeline (5) stabilizes and approaches the density of the conveying fluid (17), fully open the third recovery valve (13), close the fourth recovery valve (14) and the fifth recovery valve (15), control the conveying pump (6) to stop rotating, and the experimental mud and sand material (18) is recovered to the recovery pool.

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