Sand adding device for indoor water tank

Abstract

The utility model discloses an indoor water tank sand adding device which comprises a sand containing bin, a sand inlet bin and a mixing bin which are sequentially arranged from top to bottom, the interior of the sand containing bin is divided into a plurality of sand containing grooves by partition plates, a motor is arranged in each sand containing groove, each sand containing groove is provided with a sand outlet, and each sand outlet is communicated with the sand inlet bin. A plurality of sand conveying screw rods matched with the motors in the sand containing groove are arranged in the sand inlet bin; a turbidity meter, a rotatable stirring barrel and a water level sensor are arranged in the mixing bin. The sand containing bin is divided into a plurality of independent sand containing grooves which can be used for containing sand with different particle sizes, the sand grading can be adjusted by adjusting the rotating speed of the corresponding motor, different sand particle size combinations can be continuously provided, and the stability of mixed sand grading is guaranteed; according to the utility model, test conditions can be provided for a model test in which the sand content and grading change for multiple times at the same time. According to the utility model, the autorotation stirring of the stirring drum is realized by utilizing inlet water flow, and an additional stirring driving device is not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic test equipment, in particular to an indoor water tank sand adding device. Background Art

[0002] In order to explore the law of suspended sediment transport, indoor water tank or river engineering physical model test is an indispensable means. The sand adding device adds the required concentration of sediment to the test water flow to achieve the required sediment content for the test. The existing sand adding device, such as the prior art document: Application No. 202320863143.X, discloses an automatic sand adding device for a mobile moving bed model. The terminal control panel can prepare the water-sand solution according to the set sediment concentration, and use the vacuum pump to create negative pressure to suck the water-sand mixture into the mixing tank. After stirring evenly, it is added to the test water tank through the flow controller at the outlet. The liquid level and turbidity sensors feed back data to the terminal panel in real time to ensure the sand mixing effect. The shortcomings of the prior art document are: the sand adding device can only adjust the amount of sediment, but cannot adjust the gradation of sediment; the water and sand need to be mixed and stirred in the reservoir first, and the pre-mixed solution needs to be sucked into the mixing tank and stirred again. The stirring device also needs to add an additional drive device, which is complex in structure; the sand content sucked into the mixing tank by the vacuum pump may be different from the sand content initially set. Utility Model Content

[0003] The utility model aims to solve the problems that the prior art cannot adjust the silt gradation, requires an additional driving device for stirring, and the sand content cannot be accurately controlled, and proposes an indoor water tank sand adding device.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0005] An indoor water tank sand adding device comprises a sand storage bin, a sand inlet bin and a mixing bin arranged in sequence from top to bottom, the interior of the sand storage bin is divided into a plurality of sand storage bins by a partition, each sand storage bin is provided with a motor, each sand storage bin has a sand outlet, and each sand outlet is communicated with the sand inlet bin;

[0006] The sand inlet bin is provided with a plurality of sand conveying screws matching the motors in the sand trough, and each motor drives the sand conveying screw connected thereto to deliver the sediment in the sand trough into the mixing bin; the mixing bin is connected with a water inlet pipe, and a water outlet is arranged on the side wall of the mixing bin, and the water outlet is arranged close to the bottom wall of the mixing bin, a turbidity meter is arranged on the bottom wall of the mixing bin close to the water outlet, a rotatable stirring drum is arranged on the bottom wall of the mixing bin, and a water level sensor is vertically arranged on the top wall of the mixing bin; the motor, the turbidity meter and the water level sensor are all electrically connected to the computer.

[0007] The sand-adding device of the utility model enters sand at the top and discharges water at the bottom, and the sand-adding, stirring and water-discharging are integrated. Compared with the prior art documents, the water and sand need to be mixed and stirred in a water reservoir first, and then an additional vacuum pump device is required to suck the pre-stirred solution into another stirring tank for further stirring, which will cause uneven mixing, inconsistency between the pre-stirring sand content and the re-stirring sand content, complex structure, and the stirring device needs to add an additional driving device. The overall structure of the sand-adding device of the utility model can ensure that the amount of sand added is consistent with the amount of sand discharged, so that the sand content of the water discharge meets the target sand content set in the test, and no additional driving device is required, thereby realizing automatic stirring.

[0008] The utility model divides the sand storage bin into multiple sand storage troughs, and together with the sand inlet bin with the same number of screws, can meet the requirements of finer sediment grading. Sediment of different particle sizes can be placed in each compartment of the sand storage bin (also applicable to uniform sand), and the rotation speed of the motor under each sand storage bin can be controlled by computer to obtain a sand-containing solution with a target suspended sand grading, ensuring the accuracy of the mixed sand grading; the sediment grading can be changed by adjusting the rotation speed of each motor, meeting the requirements of complex suspended sand tests, and more accurately simulating the influence of different suspended sand grading pairs on the results of the sand transport test.

[0009] The utility model can realize accurate measurement and control of water and sand when combined with an automatic control system. It is only necessary to set a flow meter on the water inlet pipe and the water outlet pipe to monitor the flow value in real time, and to set a water-saving valve on the water inlet pipe and the water outlet pipe, and to set a valve controller on the water-saving valve, so that the valve controllers are electrically connected to the computer, so that the water-saving valves are controlled by the computer. The computer adjusts the water-saving valves on the water inlet pipe and the water outlet pipe according to the monitored flow value, so that the water inlet flow rate is consistent with the water outlet flow rate. The water outlet level and the target water inlet flow rate can be set on the computer, and the water-saving valve can be adjusted to make the water inlet flow rate of the water inlet pipe equal to the target water inlet flow rate. When the water level reaches the set water outlet level, the water outlet is turned on. The corresponding target sand content can also be set on the computer. The turbidity value in the mixing chamber is monitored by the turbidity meter in real time, and the computer calculates the sand content in the mixing chamber according to the turbidity value. If the detected sand content is lower than the target sand content, the water inlet volume remains unchanged, the motor speed is increased as a whole, the sand intake is increased, and water is discharged when the sand content is stable and reaches the set water level; if the detected sand content is greater than the target sand content, the water inlet volume remains unchanged, the motor speed is decreased as a whole, the sand intake is reduced, and water is discharged when the sand content is stable and reaches the set water level; if the water level has reached the set value and the sand content does not meet expectations, the water outlet must be opened first, and the sand content must be gradually corrected during the drainage process.

[0010] The utility model stirs the mixture in a mixing bin by means of a rotating mixing drum, and stirs the mixture while feeding sand and water, so that the water and sand are mixed more evenly.

[0011] Furthermore, the mixing drum is connected to the bottom wall of the mixing bin through a connecting piece, and the connecting piece is sealed to the bottom wall of the mixing bin. The mixing drum is vertically and movably installed on the upper end of the connecting piece and is located in the mixing bin, and the mixing drum and the connecting piece are dynamically sealed. The lower end of the connecting piece is sealed to the water inlet pipe of the mixing bin, and there is a gap between the bottom end of the mixing drum and the water inlet pipe of the mixing bin. The interior of the mixing drum is hollow, and the whole is a cylindrical body with a top but no bottom. A number of water outlet holes are opened on the side wall of the mixing drum, and the axis of each water outlet hole is not perpendicular to the side wall of the mixing drum. Looking down along the axis of the mixing drum, the axis of the water outlet hole forms a certain inclination angle with the wall normal in the horizontal direction. A number of water outlet holes are arranged in a spiral shape around the axis of the mixing drum. Water flows into the mixing drum through the water inlet pipe and the connecting piece of the mixing bin, and is ejected from the outlet water, driving the mixing drum to rotate in the connecting piece. The water inlet pipe of the mixing bin is connected to a pressure regulating valve, and the pressure regulating valve has a corresponding valve controller, and the valve controller is electrically connected to the computer.

[0012] The rotation of the mixing drum of the utility model does not require an additional driving device. It only needs to set a pressure regulating valve on the water inlet pipe of the mixing bin. The water flow rate and pressure in the water inlet pipe of the mixing bin are adjusted by the pressure regulating valve, so that the mixing drum can eject a strong water column and rotate. The water column stirs along the direction of water depth, so that the water and sand in the mixing bin are fully mixed.

[0013] Furthermore, the sand adding device also includes a premixing bin, the premixing bin and the mixing bin are both connected with water inlet pipes, each water inlet pipe is connected with a throttle valve, each throttle valve has a corresponding valve controller, and the valve controller is electrically connected to the computer.

[0014] Before the sediment enters the mixing bin, it is first sprayed with water through the water inlet pipe of the pre-mixing bin to form wet sand. After falling into the mixing bin, it will not float on the water surface. If dry sand falls directly into the mixing bin, it may cause uneven mixing due to floating on the water surface, resulting in a large difference between the amount of sediment entering and the data measured by the turbidity meter.

[0015] Furthermore, the premixing bin is a cylindrical structure as a whole, and a truncated cone-shaped cavity with a larger upper part and a smaller lower part in the premixing bin is a sand conveying channel. The large opening of the sand conveying channel faces the sand inlet bin, and the small opening is connected to the mixing bin.

[0016] The truncated cone-shaped sand transport channel can bring together sand of different particle sizes from all directions of sand discharge, making the mixing more uniform. Sand storage bins and sand inlet bins with different numbers of compartments can be replaced as a whole.

[0017] Furthermore, the sand adding device also includes a support frame, which is a truncated cone-shaped structure with a small upper part and a large lower part. The inner diameter of the upper end of the support frame is slightly larger than the outer diameter of the sand inlet bin. A circle of grooves is provided on the upper surface of the mixing bin. The bottom of the sand inlet bin and the pre-mixing bin are both located inside the support frame, and the lower end of the support frame is located in the groove of the mixing bin.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model divides the sand storage bin into a plurality of independent sand storage troughs, which can respectively place sand of different particle sizes. By adjusting the rotation speed of each motor, the sand gradation can be adjusted, and the target sand gradation can be automatically matched, and different combinations of sand particle sizes can be continuously provided, and the stability of the mixed sand gradation can be ensured. The utility model can also provide test conditions for model tests simulating multiple changes in sand content and gradation at the same time.

[0020] 2. The utility model utilizes the inlet water flow to realize the self-rotation stirring of the mixing drum, and there is no need to set up an additional stirring drive device.

[0021] 3. The sand adding system of the utility model integrates sand adding, water intake, stirring and water discharge into a whole, and is provided with a plurality of sensors. When matched with an automatic control system, the water intake and discharge systems and the amount of sand intake can be controlled in real time based on the signal feedback of the plurality of sensors and the control of a computer. In the process of sand adding, water intake and stirring at the same time, accurate measurement and control of water and sand can be achieved, so that the amount of sand mixed in the water reaches the target sand content, and the sand content of the water discharge meets the target sand content set in the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the Gaza device.

[0023] Figure 2 for Figure 1 Cross-sectional view structure.

[0024] Figure 3 It is the structural schematic diagram of the sand conveying screw.

[0025] Figure 4 It is a schematic diagram of the structure of the mixing drum.

[0026] Figure 5 Schematic diagram of automatic control system.

[0027] Figure 6 This is the control and feedback logic diagram of the automatic sand distribution system.

[0028] The meanings of the symbols in the accompanying drawings are as follows: 1 sand storing bin, 11 motor, 2 sand inlet bin, 21 support frame, 22 sand conveying screw, 3 pre-mixing bin, 31 first water inlet pipe, 32 sand conveying channel, 4 mixing bin, 41 second water inlet pipe, 42 connecting piece, 43 water outlet, 44 turbidity meter, 45 water level sensor, 46 mixing drum, 461 water outlet, 5 integrated automatic control system, 51 computer, 52 water pump, 53 overflow valve, 54 flow collector, 541 first flow meter, 542 second flow meter, 55 first throttle valve, 56 second throttle valve, 57 pressure regulating valve, 58 third throttle valve, 551 first throttle valve controller, 561 second throttle valve controller, 571 pressure regulating valve controller, 581 third throttle valve controller, 552 diverter valve. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the described embodiments are only part of the embodiments of the present invention, not all of them, and are an explanation of the present invention, not a limitation of the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention. Embodiment 1:

[0030] like Figures 1 to 4 , an indoor water tank sand adding device, which includes a sand containing bin 1, a sand inlet bin 2 and a mixing bin 4 from top to bottom. The sand containing bin 1 and the sand inlet bin 2 are an integrated structure, the outer diameters of the sand inlet bin 2 and the pre-mixing bin 3 are the same, and the sand containing bin 1 and the sand inlet bin 2 are supported as a whole on the top of the mixing bin.

[0031] In this embodiment, the sand outlet of the sand storing bin 1 is connected with the sand inlet bin 2. A motor 11 is provided in the sand storing bin 1, and a sand conveying screw 22 is provided in the sand outlet. The sand required for the test is placed in the sand storing bin 1, and the motor is turned on. The motor drives the sand conveying screw to rotate, and the sand in the sand storing bin 1 is sent into the mixing bin 4.

[0032] The bottom wall of the mixing bin 4 is connected to a second water inlet pipe 41 through a connector 42, a water outlet 43 is provided on the side wall of the mixing bin 4 near the bottom wall, a turbidity meter 44 is provided on the bottom wall of the mixing bin 4 near the water outlet 43, and a water level sensor 45 is vertically connected to the top wall of the mixing bin 4.

[0033] The turbidity meter 44 is disposed close to the water outlet 43 because the sediment content measured at the water outlet 43 is closest to the sediment content of the outlet water, that is, the sediment content value required for the test, which can reduce the error.

[0034] The computer 51 controls the speed of the motor 11, and the turbidity meter 44 and the water level sensor 45 feed back the turbidity value at the outlet and the water level in the mixing bin to the computer 51 in real time. The sand content is calculated based on the calibration relationship between the turbidity value and the sand content to ensure the accuracy of the sand mixing result. When the water is discharged, the water level can be guaranteed to always be maintained at the set water level. If it does not meet the set water level, the speed of the motor 11 and the water inlet volume of the second water inlet pipe 41 can be adjusted in time.

[0035] In this embodiment, the water level sensor 45 is a capacitive water level sensor, and the turbidity meter is OBS501. Embodiment 2:

[0036] On the basis of Example 1, it also includes a premixing bin 3, the premixing bin 3 and the mixing bin 4 are an integrated structure, and the sand storage bin 1 and the sand inlet bin 2 are integrally supported on the top of the premixing bin. In this embodiment, the premixing bin 3 is a cylindrical barrel structure, and its inner wall is thin at the top and thick at the bottom, so that the truncated cone-shaped cavity with a large top and a small bottom in the premixing bin 3 is a sand conveying channel 32, the large opening of the sand conveying channel faces the sand inlet bin 2, and the small opening is connected to the mixing bin 4. The side wall of the premixing bin 3 is evenly connected to multiple first water inlet pipes 31, and the first water inlet pipe 31 supplies water to the premixing bin 3 from the outside. The figure of this embodiment shows that four first water inlet pipes 31 are evenly connected to the side wall of the premixing bin 3, and the water inlet amount of the first water inlet pipe 31 is adjustable. The motor 11 drives the sand conveying screw 22 to rotate, and the sediment in the sand storage bin 1 is first sent to the premixing bin 3, and water is sprayed to the sediment in the premixing bin 3 through the first water inlet pipe 31. The sediment enters the mixing bin 4 in a wet sand state, which can prevent dry sand from being suspended on the water surface. Embodiment 3:

[0037] like Figure 2 As shown, in order to increase the stability of the connection between the sand containing bin 1 and the sand inlet bin 2 on the premixing bin 3, a support frame 21 is provided in this embodiment. The support frame is a truncated cone-shaped structure that is small on the top and large on the bottom. The inner diameter of the upper end of the support frame is slightly larger than the outer diameter of the sand inlet bin 2. A circle of grooves is provided on the upper surface of the mixing bin 4. The bottom of the sand inlet bin 2 and the premixing bin 3 are located in the support frame, and the lower end of the support frame is located in the groove of the mixing bin 4. The support frame 21 plays a role of auxiliary support.

[0038] In this embodiment, the sand containing bin 1 and the sand inlet bin 2 are made of 6061 aluminum alloy, and the support frame 21, the sediment mixing bin 3, and the mixing bin 4 are made of 304 stainless steel. Embodiment 4:

[0039] In this embodiment, in order to adjust the gradation of the sediment while adding sand, the utility model designs the sand storage bin 1 into four compartments, and the interior of the sand storage bin is divided into four compartments by a partition, each compartment is an independent sand storage tank, and a motor 11 is arranged in each compartment, and accordingly, there are four sand outlets and four sand conveying screws 22, such as Figure 1 , 2shown.

[0040] Sediment of different particle sizes can be placed in the four-compartment sand bins (the same applies to uniform sand). The rotation speed of the motors under the four sand bins can be controlled by a computer, so that sediment of different particle sizes can enter the pre-mixing bin at the same time, ensuring the accuracy of the mixed sand gradation and obtaining a sand-containing solution of the target gradation. The sediment gradation can be changed by adjusting the rotation speed of the four motors to meet the needs of complex suspended sediment tests and more accurately simulate the influence of different suspended sediment gradations on the sediment transport test results.

[0041] The utility model can ensure the uniformity of sand addition and the stability of mixed sand gradation by controlling the rotation speed of the motor to remain unchanged; it can also provide different combinations of sediment conditions and change the corresponding motor rotation speed to control the feeding rate of four different particle sizes of sediment to achieve the target sediment gradation and target sand content: when the suspended sand gradation needs to be changed during the test, it is only necessary to adjust the rotation speed of the corresponding screw without the need for cumbersome operations such as changing sand. The utility model can also provide conditions for model tests that simulate multiple changes in sand content and gradation at the same time.

[0042] If four kinds of sediments with different particle sizes are added to the solution separately, it is difficult to mix the sediments with different particle sizes evenly. Therefore, sediments with different particle sizes are introduced at the same time and mixed into one in the pre-mixing bin in advance.

[0043] Four kinds of sediments with different particle sizes are gathered together through the sediment transport channel 32, but the mixing is not uniform enough, and they will fall into the mixing bin 4 in four different directions. It is easier to disperse when they fall into the solution. Therefore, four first water inlet pipes are designed. Through the impact of water flow in four directions, the four kinds of sediments are fully mixed and then fall into the water. At the same time, adding them into the water in a wet sand state can avoid the problem of dry sand suspended on the water surface. More first water inlet pipes can also be set.

[0044] In the natural environment, the particle size distribution of sediment is usually diverse, so the combination of sediment of a single particle size or a few particle sizes may not be able to fully simulate this complexity. In contrast, the use of a four-grid sand storage bin can achieve sediments of various particle sizes. The mixed sand can more comprehensively reflect the subtle changes in the sediment gradation curve and increase the diversity of sand adding conditions in the test. According to the needs of the test, multi-grid sand storage bins such as 5-grid and 6-grid can be designed to make more detailed changes in sediment gradation. The sand storage bin and the sand inlet bin can be replaced and placed in the pre-mixing bin and the support frame. Embodiment 5:

[0045] In this embodiment, a mixing drum 46 is also connected to the connecting member 42. In this embodiment, the mixing drum 46 is arranged vertically, but it can also be arranged horizontally perpendicular to the direction shown in the figure. The mixing drum 46 is located in the mixing bin 4. Figure 2The axis of the mixing drum 46 shown in the figure coincides with the axis of the pre-mixing bin 3, and may also be slightly offset relative to the axis of the pre-mixing bin 3. The main function of the mixing drum 46 is to stir the water and sand in the mixing bin to make the water and sand mixed more evenly.

[0046] The bottom wall of the mixing bin is provided with a connection hole, in which the connection piece is sealed and connected, and the lower end of the connection piece is sealed and connected to the second water inlet pipe 41 through a pressure regulating valve 57. The upper end of the connection piece has a stepped through hole inside, and the end near the outlet has a smaller diameter; the mixing drum 46 extends upward from the lower end of the connection piece, and the lower end of the mixing drum has a limit plate, the outer diameter of the limit plate is slightly smaller than the inner diameter of the lower end of the connection piece but larger than the inner diameter of the upper end of the connection piece, so that the lower end of the mixing drum is limited in the connection piece, and the upper end of the mixing drum extends through the upper end outlet of the connection piece, and the upper end outer diameter of the mixing drum is slightly smaller than the inner diameter of the upper end of the connection piece. The mixing drum is hollow inside, and the whole is a cylindrical body with a top but no bottom. Water flows into the mixing drum through the water inlet pipe and the connection piece of the mixing bin, so that the mixing drum can not only rotate in the connection piece under the action of the internal water flow, but also the mixing drum and the connection piece are dynamically sealed and watertight. The water inlet pipe of the mixing bin 4 is connected with a pressure regulating valve 57, and the pressure regulating valve 57 has a corresponding valve controller.

[0047] like Figure 4 As shown, a plurality of circular water outlet holes 461 are provided on the side wall of the mixing drum 46, and the axis of each water outlet hole is not perpendicular to the side wall of the mixing drum 46. Looking downward along the axis of the mixing drum, the axis of the water outlet hole forms a certain inclination angle with the wall normal in the horizontal direction, which can be designed to be 60°. The water ejected from the water outlet hole drives the mixing drum to rotate as a whole, and a plurality of water outlet holes 461 are arranged in a spiral shape around the axis of the mixing drum; the mixing drum is an independent component, and when water flows in from the second water inlet pipe 41 and out from the water outlet hole, the water flows drive the bottom of the mixing drum 46 to be pressed tightly against the connecting piece 42, and enables the mixing drum 46 to rotate flexibly in the horizontal direction. When no water flows in, it can slide downward to the top of the pressure regulating valve 57 due to its own weight to avoid falling downward.

[0048] When the water depth in the mixing chamber 4 reaches a certain level, the water column ejected from the wall of the mixing drum 46 in the submerged water flow can fully turbulently mix the water flow, achieving turbulence at the full water depth, thereby achieving full mixing of water and sand. Embodiment 6:

[0049] The indoor water tank sand adding device described in the utility model can be connected to the water inlet system, the water outlet system and the automatic control system to realize automatic measurement and control of water and sand. Figure 5 The automatic control system includes a motor 11, a turbidity meter 44, a water level sensor 45, a computer 51, a valve controller, a first flow meter 541, a second flow meter 542 and a flow collector 54.

[0050] The water inlet system includes a water pipeline and a water pump 52. The water pipeline is connected with an overflow valve 53 and a first flow meter 541. The water pump draws water for mixing sediment into the water pipeline, and the excess water is discharged from the overflow valve 53. The total flow is then measured by the first flow meter 541. The flow collector 54 collects the signal of the first flow meter 541 and feeds it back to the computer 51. After passing through the first flow meter 541, the water pipeline is divided into two paths. One path enters the first water inlet through the first throttle valve 55 and the four-way diverter valve 552. The first throttle valve 55, the second throttle valve 56 and the pressure regulating valve 57 are all provided with valve controllers, namely the first throttle valve controller 551, the second throttle valve controller 561 and the pressure regulating valve controller 571. The computer 51 adjusts the first throttle valve 55, the second throttle valve 56 and the pressure regulating valve 57 respectively by controlling the three valve controllers on the water inlet system.

[0051] The water outlet system includes a water outlet pipe installed at the water outlet 43, and the water outlet pipe is connected to a second flow meter 542 and a third throttle valve 58. The flow collector 54 collects the values ​​of the first flow meter and the second flow meter and feeds back signals to the computer. The computer 51 adjusts the third throttle valve 58 by controlling the third throttle valve controller 581 to adjust the water outlet flow.

[0052] The water inlet flow value of the first flow meter collected by the flow collector 54 and the water outlet flow value of the second flow meter should theoretically be consistent, and the water level of the mixing chamber 4 should remain unchanged to ensure the stability of the sand content in the sand-added water body. The water tank experiment can be started when the system reaches a balanced state.

[0053] The purpose of setting the third throttle valve 58 is to adjust the water outlet flow rate. In order to ensure that the water outlet flow rate is as consistent as possible with the water inlet flow rate, if the experiment requires the water flow added to the water tank to increase / decrease, then the water inlet flow rate and the water outlet flow rate need to be adjusted accordingly, so it is also necessary to add a throttle valve at the water outlet.

[0054] In this embodiment, the first flow meter 541 is a volumetric flow meter, and the second flow meter 542 is an electromagnetic flow meter, so as to measure the flow rate of the sand-containing water body at the outlet; the overflow valve 53 is a DBW10B electromagnetic overflow valve; the first throttle valve 55, the second throttle valve 56 and the third throttle valve 58 are all A1Y-H61B hydraulically controlled pilot one-way throttle valves; the pressure regulating valve 57 is a DR10-4-50B hydraulic pilot pressure reducing valve.

[0055] The turbidity meter 44 and the water level sensor 45 feed back the turbidity value at the outlet and the water level in the bin to the computer 51 in real time, and calculate the sand content according to the rated relationship between the turbidity value and the sand content to ensure the accuracy of the sand mixing result. When the water is discharged, the water level in the mixing bin 4 is always maintained at a certain level. If it does not meet the target setting, the DC motor 11 and the first throttle valve 55 and the second throttle valve 56 can be adjusted in time.

[0056] The calibration relationship between turbidity value and sediment content can be calibrated according to the selected turbidity meter model. Before the flume test, the correlation between water turbidity and measured suspended sediment concentration can be established through calibration test, and turbidity conversion can be performed to obtain the suspended sediment concentration observed by OBS501.

[0057] The test results of OBS501 obtained in the current literature are as follows: C = 0.0000002684NTU^2 +0.00116458 NTU, C is the suspended sediment concentration value, kg / m 3 , NTU is the turbidity value.

[0058] If the turbidity value is small and the sediment content needs to be increased, the first throttle valve 55 and the second throttle valve 56 can be kept unchanged, and the speeds of the four motors can be increased as a whole (at the same time, the speed ratio of the four motors needs to be kept unchanged, so as to ensure that the sediment gradation remains unchanged). As for how much the speed should be increased, it can be calculated based on the relationship between the speed and the sediment inlet rate measured in the test, and finally verified using the detection value of the turbidity meter.

[0059] like Figure 6 As shown, the utility model can achieve the following by combining the water inlet system, the water outlet system and the automatic control system:

[0060] (1) Control of sediment gradation: The computer controls the sediment gradation by setting the rotation speeds of the four motors 11.

[0061] (2) Control of sand feeding rate: The relationship between the speed of a single motor 11 and the sand feeding rate is determined through experiments, and the speeds of the four motors 11 are adjusted according to the target sand feeding rate.

[0062] (3) Control of water inlet rate. The computer 51 first sets the target water inlet flow rate, that is, the value of the first flow meter, and then adjusts the second throttle valve 56 through the second throttle valve controller 561, adjusts the pressure regulating valve 57 through the pressure regulating valve controller 571, and adjusts the water flow rate and pressure of the second water inlet pipe 41, so that the mixing drum 46 rotates and a strong water column is ejected to achieve the effect of fully mixing water and sand; the first throttle valve 55 is fine-tuned through the first throttle valve controller 551 according to the required target water inlet volume to achieve a suitable water inlet rate and fully mix the sediment in the premixing chamber 3; in the process of adjusting the two throttle valves and the pressure regulating valve 57, the overflow valve 53 removes excess flow and keeps the system pressure stable, and at the same time the flow collector 54 on the integrated automatic control system collects the signal of the first flow meter 541 to ensure that the flow is maintained at the target water inlet flow, even if the value of the first flow meter is the target water inlet flow set by the computer.

[0063] A second throttle valve 56 (to adjust the flow rate first) and a pressure regulating valve 57 (to change the water flow rate and water pressure) are installed on the water inlet pipe 41 to adjust the rotation speed of the mixing drum.

[0064] (4) Control of water outlet rate. The computer 51 adjusts the third throttle valve 58 at the water outlet 43 through the third throttle valve controller 581, and collects the signal of the second flow meter 542 through the flow collector 54 to ensure that the flow rate is maintained at the target water outlet flow rate, that is, the value of the second flow meter 542 is equal to the value of the first flow meter 541.

[0065] (5) Sensor feedback and adjustment. After the turbidity meter 44 feedbacks the signal, the computer 51 uses the relationship between the turbidity value and the sand content to calculate the sand content at the outlet. If it is inconsistent with the target sand content, the water intake can be guaranteed to be constant at this time, and the rotation speed of all motors 11 is adjusted in proportion to gradually stabilize the sand content; the flow collector 54 collects the signals of the first flow meter 541 and the second flow meter 542 and feeds them back to the computer. The inlet and outlet water flows should be kept consistent after the system is running stably; the water level in the tank is guaranteed by the signal feedback of the water level sensor 45. When the set water level is reached, water starts to be discharged. After the system is running stably, the water level is always maintained at a certain level, that is, the inlet and outlet water flows are balanced.

Claims

1. An indoor water tank sand adding device, characterized in that: The invention comprises a sand storage bin (1), a sand inlet bin (2) and a mixing bin (4) which are arranged in sequence from top to bottom. The interior of the sand storage bin (1) is divided into a plurality of sand storage slots by partitions. A motor (11) is arranged in each sand storage slot. Each sand storage slot has a sand outlet, and each sand outlet is connected to the sand inlet bin (2). The sand inlet bin (2) has a plurality of sand conveying screws (22) matched with the motors in the sand trough, and each motor (11) drives the sand conveying screw (22) connected thereto to convey the silt in the sand trough into the mixing bin (4); the mixing bin (4) is connected to a water inlet pipe, a water outlet (43) is arranged on the side wall of the mixing bin (4), the water outlet (43) is arranged close to the bottom wall of the mixing bin (4), a turbidity meter (44) is arranged on the inner bottom wall of the mixing bin (4) close to the water outlet (43), a rotatable stirring drum (46) is arranged on the inner bottom wall of the mixing bin (4), and a water level sensor (45) is vertically arranged on the inner top wall of the mixing bin (4); the motor (11), the turbidity meter (44) and the water level sensor (45) are all electrically connected to a computer (51).

2. The indoor water tank sand adding device according to claim 1, characterized in that: The mixing drum (46) is connected to the bottom wall of the mixing bin (4) via a connecting piece (42); the connecting piece (42) is sealedly connected to the bottom wall of the mixing bin (4); the mixing drum (46) is vertically and movably mounted on the upper end of the connecting piece and is located in the mixing bin (4); the mixing drum (46) and the connecting piece (42) are dynamically sealed; the lower end of the connecting piece (42) is sealedly connected to the water inlet pipe of the mixing bin (4); and a gap is provided between the bottom end of the mixing drum (46) and the water inlet pipe of the mixing bin (4); the mixing drum (46) is hollow inside and is a cylindrical body with a top but no bottom as a whole; a plurality of water outlet holes (461) are provided on the side wall of the mixing drum (46); each outlet hole (461) is provided with a plurality of water outlet holes (461) and ... The axes of the water holes (461) are not perpendicular to the side wall of the mixing drum (46); when looking downward along the axis of the mixing drum, the axes of the water outlet holes (461) form a certain inclination angle with the normal line of the wall surface in the horizontal direction; a plurality of water outlet holes (461) are arranged in a spiral shape around the axis of the mixing drum (46); water flows into the mixing drum (46) through the water inlet pipe and the connecting piece (42) of the mixing chamber (4) and is ejected from the water outlet holes (461), driving the mixing drum (46) to rotate in the connecting piece (42); a pressure regulating valve (57) is connected to the water inlet pipe of the mixing chamber (4); the pressure regulating valve (57) has a corresponding valve controller, and the valve controller is electrically connected to a computer.

3. The indoor water tank sand adding device according to claim 1, characterized in that: The sand adding device also includes a premixing chamber (3), the premixing chamber (3) and the mixing chamber (4) are both connected to a water inlet pipe, each water inlet pipe is connected to a throttle valve, each throttle valve has a corresponding valve controller, and the valve controller is electrically connected to a computer.

4. The indoor water tank sand adding device according to claim 3, characterized in that: The premixing bin (3) is a cylindrical structure as a whole. A truncated cone-shaped cavity with a larger top and a smaller bottom is provided in the premixing bin (3) as a sand transport channel (32). The sand transport channel (32) has a large opening connected to the sand inlet bin (2) and a small opening connected to the premixing bin (3).

5. The indoor water tank sand adding device according to claim 3, characterized in that: The sand adding device further comprises a support frame (21). The support frame (21) is a truncated cone-shaped structure that is smaller at the top and larger at the bottom. The inner diameter of the upper end of the support frame (21) is slightly larger than the outer diameter of the sand inlet bin. A circle of grooves is provided on the upper surface of the mixing bin (4). The bottom of the sand inlet bin (2) and the pre-mixing bin (3) are located inside the support frame (21). The lower end of the support frame (21) is located in the groove of the mixing bin (4).

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