CN102493390A - Device for adding sand to suspended load in river model test - Google Patents
Device for adding sand to suspended load in river model test Download PDFInfo
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- CN102493390A CN102493390A CN201110454259XA CN201110454259A CN102493390A CN 102493390 A CN102493390 A CN 102493390A CN 201110454259X A CN201110454259X A CN 201110454259XA CN 201110454259 A CN201110454259 A CN 201110454259A CN 102493390 A CN102493390 A CN 102493390A
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Abstract
The invention relates to a device for adding sand to suspended load in a river model test, and belongs to the field of hydraulic tests. The device mainly comprises a sand supply power system, a sand release device, a sand supply pipe and a return pipe, and is characterized by also comprising an integrated automatic control system, wherein the inlet and outlet of the sand supply power system is connected with the sand release device through the sand supply pipe and the return pipe to form a suspended load slurry conveying loop; and the integrated automatic control system is connected with the sand supply power system and the sand release device through a control line to monitor and adjust the suspended load slurry conveying process of the sand supply power system and the sand release device. By the device, the sand supply system is not blocked, backflow of a bypass pipe and the return pipe stirs a slurry tank, and a sand adding hole is not clogged under any experiment conditions; and the device can accurately meter the sand adding flow, and can fully automatically control to add the sand.
Description
Technical field
The invention belongs to water conservancy test field, particularly the suspended load gaza device of river model test.
Background technology
Be suspended in the sand grain that moves downstream with current in the water body and be called suspended sediment.In natural river, suspended sediment content accounts for the ratio of total quantity of sand and mud generally more than 80%.River model test is as the important means of river research, and the simulation of suspended sediment motion is most important.For in river model test, accurately simulating the motion process of suspended sediment, need set up the husky piece-rate system of water, promptly, add suspended sediment through suspended load gaza device simultaneously in river model import dispensing water flow process.During the gaza; At first the suspended load gaza amount that needs add under certain grade of water flow is confirmed in design according to river model; Through suspended load gaza device the mortar of needed higher sediment concentration is added the river model import, and get into the river model test section after the abundant blending of current with the husky motion process of correct Simulated Water.
At present, the water flow process control of river model import has mature technique, but the suspended load mortar add method for determining sand then each model be not quite similar.The higher suspended load sand-feeding system of traditional precision is gaza, a pump suction type loop device.Gaza, pump suction type loop device, as shown in Figure 1, mainly by mortar pond 1, water pump 2, current stabilization tower 3, supply sand tube 4, put husky device 5 and return duct 6 is formed.The operating principle of this device is: high-lift pump 2 is evacuated to the high concentration mortar in the mortar pond 1 in the current stabilization tower 3 of eminence; From tower, draw and supply sand tube 4; Put the remaining mortar in husky operation back in river model import 7 and return mortar pond 1, thereby mortar is circulated in whole gaza device with higher flow velocity through return duct 6.Based on the difference of putting husky device 5, can further gaza, pump suction type loop device be divided into ozzle again and put and husky put two kinds of forms of sand with arm,
It is as shown in Figure 2 that ozzle is put the structure of husky device, is made up of the short tube 5-1 of a plurality of different-diameters, and dock with the corresponding aperture in aperture that has that open in the minimum place of tube wall that supplies sand tube 4 upper end of each short tube, and the short tube lower end is valve 5-2.In the process of the test, need under certain pressure, to demarcate in advance the flow of each short tube ozzle, adopt different short tube ozzle combinations to draw the mortar flow that needs based on the requirement of river model; The method can guarantee the precision of gaza, but needs manual operations, and the easy obstruction of short tube ozzle, if supply husky ducted pressure to change, also can influence the flow that the short tube ozzle is demarcated.
It is as shown in Figure 3 that arm is put the structure of husky device, by the diameter arm 5-3 suitable with supplying sand tube 4, electromagnetic flowmeter 5-4 and electrically operated valve 5-5 composition.The upper end of arm 5-3 and the perforate welding that supplies sand tube 4 outer wall lowest parts, arm 5-3 installs electromagnetic flowmeter 5-4 in the middle part, and electrically operated valve 5-5 is installed in the lower end.When putting sand, mortar flows out from arm 4 lower ends under action of gravity, controls the size of mortar flow through the aperture of regulating electrically operated valve 5-5.In process of the test; Generally all be that person in charge's flow is very big; Arm flow very little relatively (corresponding flow velocity also very little), the pilot time slot that has does not even need the gaza, very easily stops up and influences test so put husky arm; Or the alluvial of certain mortar is arranged in electromagnetic flowmeter 5-4 and influence flow detection, make troubles to practical operation.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art; A kind of suspended load gaza device that is used for river model test is proposed; This device can realize supplying that husky system is not stopped up, the refluxing and stirring mortar pond of bypass pipe and return duct, and guarantees that the aperture, gaza is not all become silted up stifled under any test conditions; Can carry out accurate measurement to gaza's flow, and can realize the Automatic Control of gaza.
A kind of suspended load gaza device that is used for river model test that the present invention proposes mainly comprises the husky dynamical system of confession, puts husky device, supplies sand tube and return duct; It is characterized in that this device also comprises integrated automatic control system; Wherein, the import and export that supply husky dynamical system with put husky device and transport the loop through supplying sand tube and return duct to connect into the suspended load mortar; Integrated automatic control system through control line with supply husky dynamical system and put husky device to link to each other, this is supplied husky dynamical system and puts monitoring and the adjusting that husky device carries out suspended load mortar transport process.
Describedly put husky device and comprise that sediment transport is responsible for and is placed in the sleeve that this sediment transport is responsible for, and be installed in that two flow meters at two ends are responsible in this sediment transport, this sleeve of driving of being connected this sleeve one end is responsible for the motor that rotates with respect to sediment transport; Have on the tube wall that described sediment transport is responsible for and put husky hole; Put also to have on the tube wall on the opposite position of husky hole and put husky hole what sleeve and sediment transport were responsible for; Make in the sleeve rotation process; Make up in the husky hole of putting of husky hole and sleeve of putting that sediment transport is responsible for, and forms the husky through hole of putting of various apertures (from closing to maximum opening).
The husky dynamical system of said confession mainly is made up of mortar pond, water pump, outstanding husky densimeter and bypass pipe and valve thereof; Wherein, the port of export of water pump links to each other with supplying sand tube, and the arrival end of water pump is inserted in the mortar pond; Bypass pipe is installed on the pipeline that supplies sand tube with outstanding husky densimeter successively; Bypass pipe interlude mounted valve, the other end of bypass pipe are inserted in the mortar pond; One end of return duct is inserted in the mortar pond.
Technical characterstic of the present invention and beneficial effect:
Characteristics of the present invention are to have guaranteed through hole, concentric circles gaza design the stability of gaza's flow, have solved the little or blockage problem the during gaza not of gaza's flow; Realize the full-automatic regulation of suspended load gaza amount and accurately dispensing through automatic control system.
The present invention can realize supplying that husky system is not stopped up, the refluxing and stirring mortar pond of bypass pipe and return duct, and guarantees that the aperture, gaza is not all become silted up stifled under any test conditions; Can carry out accurate measurement to gaza's flow, and can realize the Automatic Control of gaza.
Description of drawings
Fig. 1 is gaza's mode sketch map of traditional suspended load gaza device;
Fig. 2 is put the husky device sketch map of putting of sand tube mouth form in traditional suspended load sand-feeding system;
Fig. 3 is the husky device sketch map of putting of in traditional suspended load sand-feeding system form of tubes;
Fig. 4 is the embodiment general structure sketch map of the suspended load gaza device of a kind of river model test of the present invention;
Fig. 5 is the husky dynamical system sketch map of confession of the suspended load gaza device of a kind of river model test of the present invention;
Fig. 6 is the husky device sketch map of putting of the suspended load gaza device of a kind of river model test of the present invention;
Fig. 7 is the integrated automatic control system sketch map of the suspended load gaza device of a kind of river model test of the present invention.
The specific embodiment
Below will combine accompanying drawing and embodiment that a kind of suspended load gaza device that is used for river model test of the present invention is elaborated.
The suspended load gaza device that is used for river model test that the present invention proposes mainly comprises the husky dynamical system of confession, puts husky device, supplies sand tube and return duct; It is characterized in that this device also comprises integrated automatic control system; Wherein, the import and export that supply husky dynamical system with put husky device and transport the loop through supplying sand tube and return duct to connect into the suspended load mortar; Integrated automatic control system through control line with supply husky dynamical system and put husky device to link to each other, this is supplied husky dynamical system and puts monitoring and the adjusting that husky device carries out suspended load mortar transport process.
Describedly put husky device and comprise that sediment transport is responsible for and is placed in the sleeve that this sediment transport is responsible for, and be installed in that two flow meters at two ends are responsible in this sediment transport, this sleeve of driving of being connected this sleeve one end is responsible for the motor that rotates with respect to sediment transport; Have on the tube wall that described sediment transport is responsible for and put husky hole; Put also to have on the tube wall on the opposite position of husky hole and put husky hole what sleeve and sediment transport were responsible for; Make in the sleeve rotation process; Make up in the husky hole of putting of husky hole and sleeve of putting that sediment transport is responsible for, and forms the husky through hole of putting of various apertures (from closing to maximum opening).
A kind of example structure of the suspended load gaza device that is used for river model test that the present invention proposes is as shown in Figure 4; This embodiment mainly comprises and supplies husky dynamical system 20, puts husky device 21, integrated automatic control system 23, and will supply husky dynamical system and put husky device and connect into confession sand tube 4 and the return duct 6 that the suspended load mortar transports the loop; Wherein, Supply husky dynamical system 20 mainly to form by mortar pond 8, water pump 9, outstanding husky densimeter 10 and bypass pipe 11 and valve 12 thereof; Putting husky device 21 mainly is responsible for sleeve 15 and driven wheel 16 and stepper motor 17 devices and is formed by pair of electrical magnetic flowmeter 13 and 14, the sediment transport person in charge 19, sediment transport; Integrated automatic control system 23 is a computer 18; Computer 18 connects through holding wire 22, holding wire 22 respectively with outstanding husky densimeter 10, two electromagnetic flowmeters 13 and 14, and stepper motor 17 connects.Put husky device 21 and be placed on the river model top.
The specific embodiment of said apparatus each several part and function are described as follows respectively in conjunction with each accompanying drawing:
The husky dynamical system of the confession of this device mainly is made up of mortar pond 8, water pump 9, outstanding husky densimeter 10 and bypass pipe 11 and valve 12 thereof, and the model specification of each ingredient is selected according to experimental scale, and its structure is as shown in Figure 5.Wherein, the port of export of water pump 9 links to each other with supplying sand tube 4, and the arrival end of water pump is inserted in the mortar pond 8; Along the pipeline that supplies sand tube 4 bypass pipe 11 and outstanding husky densimeter 10 are installed successively; Supply sand tube 4 terminal with put husky device 21 and enter the mouth and be connected (not shown); One end of return duct 6 is inserted in the mortar pond 8, the other end of return duct 6 with put the outlet of husky device and be connected (not shown); Bypass pipe interlude mounted valve 12, the other end of bypass pipe is inserted in the mortar pond 8.
In process of the test; Water pump is with the mortar suction feed pipe 4 in the mortar pond 8, and mortar gets into after outstanding husky densimeter 10 is measured concentration and puts husky device, and the part mortar is through after putting husky device adding river model; Remainder returns mortar pond 8 through the return duct 6 of closure; Be installed in the bypass pipe 11 that supplies sand tube 4 entrances and can regulate the flow that supplies sand tube 4, the part mortar is directly returned the mortar pond, be used to stir mortar; For preventing to supply sand tube 4 and return duct 6 alluvials, the rotating speed of water pump 9 should satisfy the interior mortar movement velocity of pipe greater than 2 times of incipient velocity of sediment in model test.The water pump that present embodiment is selected for use is high-lift pump (power 22KW, the flow 270m that 200HW-12S type frequency modulation motor drives
3/ h, lift 135m), supplying sand tube 4 and return duct 6 is the seamless steel pipe of external diameter 100mm, outstanding husky concentration is counted RS-1000.
The present invention also can adopt the husky dynamical system of the confession of other structure that can realize above-mentioned functions.
The husky device of putting of present embodiment comprises pair of electrical magnetic flowmeter 13 and 14, the sediment transport person in charge 19, sediment transport person in charge's sleeve 15 and driven wheel 16 and stepper motor 17 devices, and the structure of this device is to realize the object of the invention critical component; Its structure is as shown in Figure 6.Wherein, electromagnetic flowmeter 13 inlets are connected with supplying sand tube 4, and outlet is responsible for 19 inlets with sediment transport and is connected, and sediment transport is responsible for 19 outlets and is linked to each other with electromagnetic flowmeter 14 inlets, and electromagnetic flowmeter 14 outlets are connected with return duct 6, make whole pipeline constitute loop; The top that 19 interludes are positioned at the river model inducer is responsible in sediment transport, and establishes in its bottom to have and put husky hole 19-1 and be used for that 19 sand is responsible in sediment transport and put into the river model inducer; Donut sleeve 15 is combined closely with sediment transport person in charge perforate 19-1 section outer wall but can be rotated; Sleeve 15 outer walls have puts husky hole 15-1; Position, aperture and size all with the sediment transport person in charge on have to put husky hole 19-1 identical; Arbitrary end of sleeve 15 (being exemplified as left end among the figure) and driven wheel 16 interlocks, this gear 16 is driven by buncher 17.The sediment transport person in charge 19 of present embodiment is all the seamless steel pipe of external diameter 100mm mutually with supplying sand tube 4 and return duct 6, and it is 50mm that the sediment transport person in charge 19 is put husky bore dia, and donut sleeve 15 is a seamless steel pipe also, and internal diameter is slightly larger than 100mm; Two electromagnetic flowmeters all adopt KDLD-50, and the stepper motor model is 57BYG009-04JG.
In the process of the test; Mortar adds in the model river course under action of gravity through the through hole that the lap of putting husky hole 15-1 and 19-1 forms; The size of two hole laps can drive sleeve 15 rotations through stepper motor 17; And then change the relative position put husky hole 15-1 and 19-1 and regulate, the mortar amount in the actual adding model river course then can be calculated through the difference of reading that reads electromagnetic flowmeter 13 and 14.Owing to be responsible for the direct perforate in 19 bottoms in sediment transport, suspended sediment directly carries out the mortar dispensing to the river model import through the aperture after regulating, and has therefore avoided the stifled problem of silt in aperture, gaza.
The integrated automatic control system of present embodiment is made up of computer 18 and holding wire 22; Computer 18 transforms card through the interior AD that establishes and is connected with holding wire 22, holding wire 22 ends respectively with hang husky densimeter 10, electromagnetic flowmeter 13 is connected with 14 and stepper motor 17.As shown in Figure 7; Also be preset with in the computer outstanding husky densimeter 10, electromagnetic flowmeter 13 and 14 and the control program operated of stepper motor 17.The computer of this device is ordinary individual's computer; Computer configuration satisfies cpu performance and is not less than Intel Pentium 4 processor, internal memory and is not less than 512M, mainboard outfit standard PCI slot, operating system version and is not less than Windows XP and gets final product; The AD transition card is installed on the mainboard PIC slot, and the control program in the computer adopts routine techniques to work out according to test requirements document.
In the process of the test; Thereby computer 18 gather the sand content of outstanding husky densimeter 10 calculate put husky device the mortar flow that will discharge; Through the aperture aperture that monitoring electromagnetic flowmeter 13 and 14 difference come control step motor 17 to regulate to put husky device, electromagnetic flowmeter 13 and 14 difference equal just to have calculated put husky device to discharge the mortar flow time, aperture adjusting in aperture finishes; This process has realized the Automatic Control of gaza, has also guaranteed the accuracy of gaza simultaneously.
The concrete working method of the bed load gaza device of a kind of river model test of present embodiment is: as shown in Figure 4, the mortar that high-lift water pump 9 extracts in the mortar pond 8 flows it with higher speed in the closed-loop path that supplies sand tube 4 and return duct 6 to form.The sand content data that computer 18 is gathered mortar through outstanding husky densimeter 10; Calculate and put the mortar flow that husky device 21 needs dispensing; Automatically control is put husky device middle sleeve gear drive motor 17 and is carried out sediment transport and be responsible for and put the adjusting that husky hole 19-1 and sleeve are put the hole size of husky hole 15-1 relative position formation; Until the difference of the electromagnetic flowmeter 13 at sleeve 15 two ends and 14 equal to calculate just now put husky device 21 and need the mortar flow of dispensing till, supply sand tube 4 to return mortar pond 8 through return duct 6 again through the residue mortar of putting husky device 21.Then directly return mortar pond 8 and together the mortar in the mortar pond is stirred once more through the part mortar of bypass pipe 11 through the mortar that return duct 6 returns without putting husky device 21.
Concrete structure of the foregoing description and size all are used to illustrate a concrete implementation of apparatus of the present invention; Not in order to limiting the technical scheme that the present invention protected, every on the basis of the foregoing description to its concrete replacement of forming, variation or increase student contributions pooled to pay for class activities and all should still belong to the present invention and protect in the category.
Claims (3)
1. a suspended load gaza device that is used for river model test mainly comprises the husky dynamical system of confession, puts husky device, supplies sand tube and return duct; It is characterized in that this device also comprises integrated automatic control system; Wherein, the import and export that supply husky dynamical system with put husky device and transport the loop through supplying sand tube and return duct to connect into the suspended load mortar; Integrated automatic control system through control line with supply husky dynamical system and put husky device to link to each other, this is supplied husky dynamical system and puts monitoring and the adjusting that husky device carries out suspended load mortar transport process.
2. install according to claim 1; It is characterized in that; Describedly put husky device and comprise that sediment transport is responsible for and is placed in the sleeve that this sediment transport is responsible for, and be installed in that two flow meters at two ends are responsible in this sediment transport, this sleeve of driving of being connected this sleeve one end is responsible for the motor that rotates with respect to sediment transport; Have on the tube wall that described sediment transport is responsible for and put husky hole; Put also to have on the tube wall on the opposite position of husky hole and put husky hole what sleeve and sediment transport were responsible for; Make that in the sleeve rotation process make up in the husky hole of putting of husky hole and sleeve of putting that sediment transport is responsible for, and forms the husky through hole of putting of various apertures.
3. install according to claim 1, it is characterized in that, the husky dynamical system of said confession mainly is made up of mortar pond, water pump, outstanding husky densimeter and bypass pipe and valve thereof; Wherein, the port of export of water pump links to each other with supplying sand tube, and the arrival end of water pump is inserted in the mortar pond; Bypass pipe is installed on the pipeline that supplies sand tube with outstanding husky densimeter successively; Bypass pipe interlude mounted valve, the other end of bypass pipe are inserted in the mortar pond; One end of return duct is inserted in the mortar pond.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110454259.XA CN102493390B (en) | 2011-12-30 | 2011-12-30 | Device for adding sand to suspended load in river model test |
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|---|---|---|---|
| CN201110454259.XA CN102493390B (en) | 2011-12-30 | 2011-12-30 | Device for adding sand to suspended load in river model test |
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| CN102493390A true CN102493390A (en) | 2012-06-13 |
| CN102493390B CN102493390B (en) | 2014-03-12 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967438A (en) * | 2012-11-14 | 2013-03-13 | 同济大学 | Accumulating coastal beach sand conveying stimulating device for water-flow flume |
| CN103195013A (en) * | 2013-04-07 | 2013-07-10 | 重庆交通大学 | Water tank suspended load test all-in-one sand adding machine |
| CN103866734A (en) * | 2014-02-27 | 2014-06-18 | 黄河水利委员会黄河水利科学研究院 | Sand content vertical line distribution hydraulic model |
| CN104355134A (en) * | 2014-10-14 | 2015-02-18 | 成都科创佳思科技有限公司 | Sand transporting device |
| CN104532783A (en) * | 2014-12-25 | 2015-04-22 | 中国水利水电科学研究院 | Automatic sand adding system of multi-boundary sediment model experiment |
| CN104863084A (en) * | 2015-05-28 | 2015-08-26 | 河海大学 | Device for simulating reciprocating flow riverway in-situ bottom mud resuspension and simulation technology thereof |
| CN105178243A (en) * | 2015-08-07 | 2015-12-23 | 黄河水利委员会黄河水利科学研究院 | Hydraulic model capable of dynamically simulating relocation diffusion process of sediment to pollutants |
| CN105756008A (en) * | 2016-04-22 | 2016-07-13 | 珠江水利委员会珠江水利科学研究院 | Automatic sand adding device for tidal estuary sediment physical model |
| CN105908672A (en) * | 2016-04-22 | 2016-08-31 | 珠江水利委员会珠江水利科学研究院 | Automatic sediment adding method for tidal estuary sediment physical model |
| CN107146514A (en) * | 2017-06-21 | 2017-09-08 | 浙江大学 | A kind of dynamic bed flume exprement Sheng Chao gazas auxiliary wave making system and control method |
| CN107700269A (en) * | 2017-10-27 | 2018-02-16 | 浙江荣晟环保纸业股份有限公司 | A kind of slurry concentration adjusting means of paper making equipment |
| CN109267533A (en) * | 2018-11-08 | 2019-01-25 | 浙江省水利河口研究院 | The gaza's device being layered under water for estuary coast silt physical model |
| CN112854115A (en) * | 2021-03-11 | 2021-05-28 | 清华大学 | Sand adding device |
| CN112942234A (en) * | 2021-03-23 | 2021-06-11 | 长江水利委员会长江科学院 | A equipment for river course model making |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967438A (en) * | 2012-11-14 | 2013-03-13 | 同济大学 | Accumulating coastal beach sand conveying stimulating device for water-flow flume |
| CN103195013A (en) * | 2013-04-07 | 2013-07-10 | 重庆交通大学 | Water tank suspended load test all-in-one sand adding machine |
| CN103866734A (en) * | 2014-02-27 | 2014-06-18 | 黄河水利委员会黄河水利科学研究院 | Sand content vertical line distribution hydraulic model |
| CN103866734B (en) * | 2014-02-27 | 2015-09-09 | 黄河水利委员会黄河水利科学研究院 | A kind of vertical measuring point sand content method of sampling |
| CN104355134A (en) * | 2014-10-14 | 2015-02-18 | 成都科创佳思科技有限公司 | Sand transporting device |
| CN104532783A (en) * | 2014-12-25 | 2015-04-22 | 中国水利水电科学研究院 | Automatic sand adding system of multi-boundary sediment model experiment |
| CN104863084A (en) * | 2015-05-28 | 2015-08-26 | 河海大学 | Device for simulating reciprocating flow riverway in-situ bottom mud resuspension and simulation technology thereof |
| CN105178243A (en) * | 2015-08-07 | 2015-12-23 | 黄河水利委员会黄河水利科学研究院 | Hydraulic model capable of dynamically simulating relocation diffusion process of sediment to pollutants |
| CN105756008A (en) * | 2016-04-22 | 2016-07-13 | 珠江水利委员会珠江水利科学研究院 | Automatic sand adding device for tidal estuary sediment physical model |
| CN105908672A (en) * | 2016-04-22 | 2016-08-31 | 珠江水利委员会珠江水利科学研究院 | Automatic sediment adding method for tidal estuary sediment physical model |
| CN105756008B (en) * | 2016-04-22 | 2018-03-27 | 珠江水利委员会珠江水利科学研究院 | Sand supply automatically device for tidal estuary sediment physical model |
| CN107146514A (en) * | 2017-06-21 | 2017-09-08 | 浙江大学 | A kind of dynamic bed flume exprement Sheng Chao gazas auxiliary wave making system and control method |
| CN107146514B (en) * | 2017-06-21 | 2019-07-09 | 浙江大学 | A kind of dynamic gaza bed flume exprement Sheng Chao auxiliary wave making system and control method |
| CN107700269A (en) * | 2017-10-27 | 2018-02-16 | 浙江荣晟环保纸业股份有限公司 | A kind of slurry concentration adjusting means of paper making equipment |
| CN109267533A (en) * | 2018-11-08 | 2019-01-25 | 浙江省水利河口研究院 | The gaza's device being layered under water for estuary coast silt physical model |
| CN109267533B (en) * | 2018-11-08 | 2024-02-06 | 浙江省水利河口研究院(浙江省海洋规划设计研究院) | Sand adding device for underwater layering of estuary coastal sediment physical model |
| CN112854115A (en) * | 2021-03-11 | 2021-05-28 | 清华大学 | Sand adding device |
| CN112854115B (en) * | 2021-03-11 | 2022-04-26 | 清华大学 | Sand adding device |
| CN112942234A (en) * | 2021-03-23 | 2021-06-11 | 长江水利委员会长江科学院 | A equipment for river course model making |
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