1. Test device of sand bag process is jettisoned to simulation kayak barge end of opening, its characterized in that: including horizontal slide rail (2) on the symmetry set up two and turn over board support (3), every turn over the both sides of board support (3) and all be equipped with and turn over board swivel rail (4), every turn over board support (3) on all be equipped with and turn over board (5), turn over board (5) and turn over board support (3) and link to each other through pivot (8), turn over board (5) link to each other through sliding shaft (9) and turn over board swivel rail (4) the both sides of turning over board (5) bottom be equipped with pivot slide rail (11), the both ends of pivot (8) and sliding shaft (9) equally divide and do not set up in pivot slide rail (11).

2. The test rig for simulating a process of launching a sandbag on a barge according to claim 1, wherein: the horizontal sliding rail device is characterized by further comprising a support (1) arranged in parallel with the horizontal sliding rail (2), the horizontal sliding rail (2) is connected with the support (1) through a screw rod (6), and the horizontal sliding rail (2) vertically moves through an adjusting screw rod (6).

3. The test rig for simulating a process of launching a sandbag on a barge according to claim 1, wherein: the turnover plate rotating rail (4) is welded on the turnover plate support (3), the turnover plate rotating rail (4) is a circular arc-shaped rail, and the circle center of the turnover plate rotating rail (4) is aligned with the circle center of a reserved hole of the rotating shaft (8) and connected onto the turnover plate support (3).

4. The test rig for simulating a process of launching a sandbag on a barge according to claim 1, wherein: the turning plate support (3) is connected with the horizontal sliding rail (2) through support shafts (7) on two sides, and after the turning plate support (3) is matched with the horizontal sliding rail (2), the horizontal position of the turning plate support (3) is adjusted through the support shafts (7).

5. The test rig for simulating a process of launching a sandbag on a barge according to claim 4, wherein: the supporting shaft (7) is fixed through a knob (10), and the knob (10) is a threaded knob.

6. The test rig for simulating a process of launching a sandbag on a barge according to claim 1, wherein: the two ends of the rotating shaft (8) and the sliding shaft (9) are respectively connected into a rotating shaft sliding rail (11) through a shaft support (12), and the end parts of the rotating shaft (8) and the sliding shaft (9) are respectively provided with a knob (10).

7. The test rig for simulating a process of launching a sandbag on a barge according to claim 1, wherein: two baffles (13) are symmetrically arranged on two sides of the turning plate (5), and the baffles (13) are fan-shaped and are fixed perpendicular to the turning plate (5).

8. The test rig for simulating a process of launching a sandbag on a barge according to claim 1, wherein:a sliding support (14) is arranged at the upper part of the sliding shaft (9); a knob (10) is arranged on the outer side of the sliding support (14) and is used for fixing the position of the sliding support (14) in the turnover plate rotating rail (4), the included angle between the connecting line of the sliding support (14) and the rotating shaft (8) and the horizontal plane is gamma, when the turnover plates (5) are closed, the included angle between the two turnover plates (5) is alpha, and when the turnover plates (5) are opened, the turnover plates (5) rotate at most

9. The test rig for simulating a process of launching a sandbag on a barge according to claim 7, wherein: the central angle beta of the baffle (13) is not less than 90 degrees, and the angle between the lowest position and the horizontal plane is 20 degrees.

10. The method of testing an apparatus for simulating a process of launching a sandbag from a barge according to claim 1, comprising the steps of:

the method comprises the following steps: placing the horizontal sliding rail (2) above the test water level;

step two: setting the closing angle of the model test prototype barge as alpha, the sliding shaft (9) in the sliding turnover plate rotating rail (4) and the horizontal included angle between the adjusting turnover plate (5) and the horizontal plane asThe angle of the turning plate (5) is fixed;

step three: converting the rotation radius of the cabin of the prototype barge into the rotation radius of the model turning plate according to a test scale; the length l of the turning plate (5) is adjusted₃Namely, the rotating shaft (8) is connected to the lower end of the turning plate (5) and is the converted rotating radius of the model turning plate (5); the length l of the fixed turning plate (5) used₃；

Step four: the two turning plate supports (3) are slid to be close to the middle until the bottom ends of the turning plates (5) are contacted; the position of the turning plate support (3) is fixed; at the moment, the distance l between the two turnover plates and the rotating shaft (8)₁Satisfy the requirement of

Step five: converting the draft of the cabin of the prototype barge according to a test scale; adjusting the height of the horizontal sliding rail (2) to enable the bottom of the turning plate (5) to be immersed into water to convert the depth;

step six: converting the maximum opening width of the cabin of the prototype barge into the maximum opening width b of the model according to a test scale; the sliding support (14) is unscrewed, and the sliding support (14) is adjusted to b +2l₃cosγ＝l₁(ii) a Rotating the turning plate (5) until the sliding support (14) abuts against the sliding shaft (9), wherein the turning plate (5) is in a maximum opening state;

step seven: and rotating the two turning plates (5) from the positions of mutual propping to the sliding supports (14) to simulate the process of opening the bottom of the open-bottom barge, namely opening a model test of throwing the sandbags by the open-bottom barge.

Background

In recent years, with the continuous change and adjustment of the river situation of the Jiangjiang river lower reaches river course Jiangsu section, the bank slope governing work of the Yangtze river course is more extensive and large. Along with the enhancement of the environmental protection concept and the continuous promotion of the great protection work of the Yangtze river, a large amount of stone material sources required by the traditional riprap revetment are nearly exhausted, and the problem can be effectively solved by the sand bag underwater revetment technology as a novel revetment technology. The sandbag is shaped by geotextile through sewing means, and a bag body with larger dimension is formed in a cabin. The inside of the building is filled with mud mortar, and the building is formed after ready-made sewing and dehydration and is thrown underwater. The sand bag bank protection technology can avoid environmental damage caused by quarrying stone materials and the like, stabilize river behavior and ensure embankment safety because of easy local acquisition of construction materials and low manufacturing cost, and is internationally and widely applied to river mouth and coast protection engineering.

In the construction process of the underwater sand bag bank protection project, the sand bag is filled on a barge, and then the sand bag is thrown into water and sinks to a designed position. The sandbag can produce the drift of certain distance under the influence of velocity of water flow, flow direction after the water is gone into, need roughly estimate drift direction and horizontal displacement according to certain theory to carry out the location of throwing the boats and ships. In practice, the throwing process is often simulated through a model test, and the drifting and sinking rules of sandbags with different shapes in various flow state water flows can be intuitively reflected.

On the one hand, this field of testing lacks dedicated testing devices: before the invention, aiming at a throwing test device of a sandbag, a 'triplet geobag and throwing drift amount calculation method (CN106777447A) thereof' is provided by combining a model test device for simulating throwing of an overwater turning plate of a barge. However, in the throwing process of the open-bottom barge, the earthwork bag is always underwater, and the earthwork bag can be in contact with a bottom plate of the barge to generate extrusion deformation and cause displacement of the earthwork bag in the throwing process, namely, the influence factors and the performance characteristics of the displacement of the earthwork bag generated by the earthwork bag when the open-bottom barge is thrown are different from the difference of throwing time of an overwater turning plate of the barge, and the conventional turning plate throwing test device cannot be applied to the research field and needs a special model test device for simulating the open-bottom process of the open-bottom barge.

On the other hand, different model scales may be adopted in multiple model tests due to different test conditions and actual prototype working conditions. In the process of throwing the sandbags by the bottom of the open barge, the maximum opening width and the opening angle of the bottom of the open barge influence the water-entering posture of the sandbags, and the test result is influenced. A test device adapted to one scale is not adapted to another scale. Therefore, a need exists for a device which can flexibly adjust the structure of the device so as to meet the requirements of different prototype working conditions and test scales.

Disclosure of Invention

The purpose of the invention is as follows: in order to solve the problem that a model test for simulating the process of throwing sandbags by the bottom-opening barge used in the underwater sand bag throwing and protecting engineering is difficult to develop, the invention provides a test device for simulating the process of throwing sandbags by the bottom-opening barge; another object of the present invention is to provide a test method thereof.

The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme: the test device for simulating the process of throwing sandbags by the bottom-opening barge comprises horizontal slide rails, wherein two turning plate supports are symmetrically arranged on the horizontal slide rails, turning plate rotating rails are arranged on two sides of each turning plate support, turning plates are arranged on the turning plate supports and connected with the turning plate supports through rotating shafts, the turning plates are connected with the turning plate rotating rails through sliding shafts, rotating shaft slide rails are arranged on two sides of the bottom of each turning plate, and two ends of each rotating shaft and two ends of each sliding shaft are equally arranged in the rotating shaft slide rails. After the matching, the turning plate can rotate along the turning plate rotating rail through the sliding shaft, and the turning plate can slide along the rotating shaft sliding rail through the rotating shaft and the shaft support on the sliding shaft.

Further, the device also comprises a support arranged in parallel with the horizontal sliding rail, the horizontal sliding rail is connected with the support through a screw rod, and the horizontal sliding rail vertically moves through an adjusting screw rod.

Furthermore, the turning plate rotating rail is welded on the turning plate support, the turning plate rotating rail is a circular arc-shaped rail, and the circle center of the turning plate rotating rail is aligned with the circle center of the reserved hole of the rotating shaft and connected to the turning plate support.

Furthermore, the turning plate support is connected with the horizontal slide rail through support shafts on two sides, and after the turning plate support is matched with the horizontal slide rail, the horizontal position of the turning plate support is adjusted on the horizontal slide rail through the support shafts.

Furthermore, the support shaft is fixed through a knob, and the knob is a threaded knob. Knobs are respectively arranged on two sides of the supporting shaft, two sides of the rotating shaft sliding rail, two sides of the sliding shaft and two sides of the turning plate rotating rail.

Furthermore, the two ends of the rotating shaft and the sliding shaft are respectively connected into the rotating shaft sliding rail through the shaft support, and the end parts of the rotating shaft and the sliding shaft are respectively provided with a knob.

Furthermore, two baffles are symmetrically arranged on two sides of the turning plate, are fan-shaped and are fixed perpendicular to the turning plate.

Furthermore, a sliding support is arranged at the upper part of the sliding shaft; the outer side of the sliding support is provided with a knob for fixing the position of the sliding support in the turning plate rotating rail, the included angle between the connecting line of the sliding support and the rotating shaft and the horizontal plane is gamma, when the turning plate is closed, the included angle between the two turning plates is alpha, and when the turning plate is opened, the turning plate rotates at most

Further, the central angle beta of the baffle is not less than 90 degrees, and the angle between the lowest position and the horizontal plane is 20 degrees.

Further, the test method of the test device for simulating the process of throwing the sandbags by the bottom-opening barge comprises the following steps:

the method comprises the following steps: fixing two ends of the bracket to the water tank; screwing nuts on the bracket one by one, and preliminarily adjusting the height of the horizontal slide rail to enable the horizontal slide rail to be above the test water level;

step two: unscrewing a knob at the tail end of the sliding shaft; setting the closing angle of model test prototype barge as alpha, sliding the sliding shaft in the rotating rail of the sliding turnover plate, and adjusting the included angle between the turnover plate and the horizontal plane to be alphaScrewing down a knob at the tail end of the sliding shaft to fix the angle of the turning plate;

step three: converting the rotation radius of the cabin of the prototype barge into the rotation radius of the model turning plate according to a test scale; the knob on the shaft support is unscrewed, and the use length l of the turning plate is adjusted₃The rotation radius of the model turning plate (from the rotating shaft to the lower end of the turning plate) is converted; the knob on the shaft support is screwed down, and the use length l of the turning plate is fixed₃；

Step four: unscrewing a knob at the tail end of the supporting shaft; sliding the two turning plate supports to approach towards the middle until the bottom ends of the turning plates are contacted; screwing down a knob on the turning plate support to fix the position of the turning plate support; at the moment, the distance between the two turnover plates and the rotating shaft is l₁Should satisfy

Step five: converting the draft of the cabin of the prototype barge according to a test scale; screwing nuts on the supports one by one, and adjusting the height of the horizontal slide rail to enable the bottom of the turning plate to be immersed into water to convert the depth;

step six: converting the maximum opening width of the cabin of the prototype barge into the maximum opening width b of the model according to a test scale; unscrewing the sliding support, adjusting the sliding support to make b +2l₃cosγ＝l₁(ii) a Loosening a knob at the tail end of the sliding shaft, and rotating the turning plate until the sliding support abuts against the sliding shaft, wherein the turning plate is in a maximum opening state;

step seven: the two turning plates are rotated from the mutually abutted positions to abut against the sliding support, so that the bottom opening process of the open-bottom barge can be simulated, and a model test of throwing the sandbags by the open-bottom barge can be carried out.

Has the advantages that: compared with the prior art, the test device for simulating the process of throwing the sandbags by the bottom-opening barge comprises two turning plate supports symmetrically arranged on a horizontal slide rail, turning plate rotating rails arranged on two sides of each turning plate support, turning plates arranged on each turning plate support, turning plates connected with the turning plate supports through rotating shafts, turning plates connected with the turning plate rotating rails through sliding shafts, rotating shaft slide rails arranged on two sides of the bottom of the turning plates, and rotating shafts and two ends of the sliding shafts equally dividedThe turning plate is arranged in the rotating shaft sliding rail respectively, after being matched, the turning plate realizes the rotation along the turning plate rotating rail through the sliding shaft, the turning plate realizes the sliding along the rotating shaft sliding rail through the rotating shaft and a shaft support on the sliding shaft, and the bottom opening process of the bottom opening barge with different closing angles, different maximum opening angles and different maximum opening widths is simulated; in addition, the test method can adjust the using length l of the turnover plate when tests are carried out by adopting different model scales₃Different barge bottom plate rotating radiuses can be simulated; the rotation angle of the turning plate is limited by adjusting the position of the movable support, so that b +2l is satisfied₃cosγ＝l₁The maximum opening width b of the bottom of different barge can be simulated; by adjusting the distance between the turning plate supportsDifferent closing angles alpha of the open-bottom barge can be simulated; the functions can be realized when different model scales are adopted, so that the method has wider applicability; in conclusion, the invention can adapt to the model test requirements of different water depth working conditions: the fixed end of the device is connected with the side wall of the water tank, the vertical height of the device main body can be adjusted through the screw rod, the throwing sandbag part can be guaranteed to be immersed in water all the time, and the actual construction condition of underwater throwing of the barge is simulated.

Description of the drawings:

FIG. 1 is a front view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a disassembled view of the components of the present invention;

FIG. 4 is a schematic representation of the operation of the test method of the present invention in the closed state;

FIG. 5 is a schematic diagram of the operation of the test method of the present invention in an open bottom state;

reference numerals: 1-bracket, 2-horizontal sliding rail, 3-turning plate support, 4-turning plate rotating rail, 5-turning plate, 6-screw, 7-supporting shaft, 8-rotating shaft, 9-sliding shaft, 10-knob, 11-rotating shaft sliding rail, 12-shaft support, 13-baffle and 14-sliding support.

The specific implementation mode is as follows:

the following detailed description of embodiments of the invention refers to the accompanying drawings. It is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.

As shown in fig. 1-3, the test device for simulating the process of throwing sandbags from the bottom of a barge comprises a bracket 1, a horizontal slide rail 2, a pair of flap supports 3, a pair of flap rotating rails 4 and a pair of flaps 5. Horizontal slide rail 2 passes through screw rod 6 linking bridge 1, turns over board support 3 and links to each other with horizontal slide rail 2 through both sides back shaft 7, turns over board 4 welding and turns over board support 3 on, turns over board 5 and links to each other through pivot 8 and turning over board support 3, turns over board 5 and links to each other through sliding shaft 9 and turning over board rotating rail 4.

The horizontal sliding rail 2 is vertically moved by the adjusting screw 6.

The turning plate support 3 can adjust the horizontal position on the horizontal sliding rail 2 through support shafts 7 at two sides and is fixed through a knob 10. The above-mentioned knob 10 is specifically a screw knob, and the knobs 10 are respectively arranged on two sides of the supporting shaft 7, two sides of the rotating shaft slide rail 11, two sides of the sliding shaft 9, and two sides of the turning plate rotating rail 4.

Two rotating shaft slide rails 11 are fixed on the bottom surface of the turning plate 5; the shaft support 12 is a circular ring structure with an inner diameter slightly larger than that of the rotating shaft 8 and the sliding shaft 9, is used for supporting the rotating shaft 8 and the sliding shaft 9, can move in the rotating shaft sliding rail 11 and is fixed through the knob 10; the use length of the turning plate 5 can be adjusted by adjusting the position of the shaft support 12; the rotating shaft 8 and the sliding shaft 9 both penetrate through the shaft support 12, and the turning plate 5 can rotate around the rotating shaft 8; two ends of a sliding shaft 9 are inserted into the turnover plate rotating rails 4, the tail end of the sliding shaft 9 is provided with threads and is provided with a knob 10, and the angle of the turnover plate 5 is fixed through the knob 10; two baffle plates 13 are fixed on two sides of the top surface of the turning plate 5, and the positions of the baffle plates 13 on the two turning plates 5 are staggered. The baffle 13 is fan-shaped, is vertical to the turning plate 5 and is in waterproof cementation or waterproof welding with the turning plate 5.

In the track of the flap rotating rail 4, a sliding support 14 is arranged in the flap rotating rail 4, above the sliding shaft 9, and a knob 10 is arranged outside the sliding support 14 and used for fixing the position of the sliding support 14 in the flap rotating rail 4; the sliding support 14 is used for limiting the rotation angle of the flap 5. After the cooperation, the turning plate 5 is rotated along the turning plate rotating rail 4 through the sliding shaft 9, and the turning plate 5 is slid along the rotating shaft sliding rail 11 through the rotating shaft 8 and the shaft support 12 on the sliding shaft 9.

Rubber gaskets are arranged on the inner sides of all knobs 10 outside the turning plate rotating rails 4 and are in contact with the turning plate rotating rails 4, and the fixing effect is enhanced.

As shown in fig. 4-5, the central angle β of the baffle 13 is not less than 90 °, the angle between the lowest position and the horizontal plane is 20 °, the angle between the connecting line of the sliding support 14 and the rotating shaft 8 and the horizontal plane is γ, when the turning plate 5 is closed, the angle between the two turning plates 5 is α, and the turning plate 5 rotates most when opened

The working process is as follows:

the method comprises the following steps: loosening the knob 10 outside the sliding shaft 9 to enable the turning plate 5 to be in a free moving state; the left turning plate 5 and the right turning plate 5 are abutted to form a V-shaped bin, namely the closing state of the open-bottom barge is simulated; the turning knob 10 outside the sliding shaft 9 is screwed down to fix the angle of the flap 5.

Step two: after the sand bag for the test is fully saturated with water, the sand bag is arranged in a V-shaped bin formed by two turning plates 5;

step three: loosening the knob 10 outside the sliding shaft 9 to enable the turning plate 5 to be in a free moving state; manually controlling the two turning plates 5 to slowly rotate until the sliding shaft 9 abuts against the movable support 14; at the moment, the maximum open angle state of the barge is correspondingly simulated; in the process, the sandbag slides down along the gap opened between the two turning plates, and the process of throwing the sandbag by opening the bottom of the barge is simulated.

A motor is arranged at the rotating shaft 8, and the rotating speed of the turning plate 5 is controlled by the motor.

Examples

The test device for simulating the process of throwing sandbags by the bottom-opening barge comprises a support 1, a horizontal slide rail 2, a pair of turning plate supports 3, a pair of turning plate rotating rails 4 and a pair of turning plates 5.

The bracket 1 is a pair of two angle steels, and two round holes are formed in each angle steel and used for connecting the screw rods 6.

The main body of the horizontal slide rail 2 is two horizontal slide rails 2 which are slightly shorter than the bracket 1, the height of each horizontal slide rail 2 is 4cm, two ends of each horizontal slide rail are respectively welded with a baffle to fixedly connect the two horizontal slide rails 2, and the whole horizontal slide rails form a frame-shaped structure; the distance between the two horizontal sliding rails is 48cm, is smaller than the distance between the two angle steels in the bracket 1, and reserves a space for the supporting shaft 7 and the rotating shaft 8 which protrude out of the horizontal sliding rails 2. The radius of the supporting shaft 7 and the rotating shaft 8 is 1 cm. A horizontal extension platform is welded on the outer side of the horizontal sliding rail 2, and a round hole is formed for connecting the screw rod 6. The screw rod 6 penetrates through the round hole to be connected with the horizontal sliding rail 2 and the support 1, and nuts are respectively arranged at the bottom of the horizontal sliding rail 2 and the top of the support 1. The bottom nuts are screwed to the same horizontal position and are kept fixed, and when the four top nuts are simultaneously screwed, the horizontal sliding rail 2 can be controlled to move upwards relative to the support 1.

The turning plate support 3 is a flat cuboid base, and the horizontal sliding rail 2 is 32cm long, 4cm high and 46cm wide; the height of the main body part of the turning plate support 3 is consistent with that of the horizontal slide rail 2; the main body part is a cube with the length of 14cm, the width of 46cm and the height of 4 cm; the side plates at the two sides extend forwards for a certain distance to ensure that the total length reaches 32 cm; two ends of the side plate are respectively provided with a support shaft 7, and the support shafts 7 are inserted into the horizontal slide rails 2; the top end of the supporting shaft 7, which extends out of the horizontal sliding rail 2, is provided with threads and a knob 10, the threads and the knob can be screwed manually, and the turning plate support 3 is fixed when the knob 10 is screwed down; the forward portion of the side plate is separated by a circular aperture for insertion of the shaft 8.

The turning plate rotating rail 4 of the embodiment is an arc rail, the width of the rail is 2cm, the central angle of the rail is 120 degrees, the included angle between the straight line connecting the circle center at the lowest position and the horizontal plane is 20 degrees, and the included angle between the straight line connecting the circle center at the highest position and the horizontal plane is 140 degrees; the circle center of the turning plate rotating rail 4 is aligned with the circle center of the reserved hole of the rotating shaft 8 and connected to the turning plate support 3.

The length of the turning plate 5 is 35cm, the width of the turning plate is 40cm, and two rotating shaft sliding rails 11 are welded at the positions close to the upper part of the bottom surface, so that the condition that the water flow is influenced when the rotating shaft sliding rails 11 are excessively long and inserted into water is avoided; the rotating shaft slide rail 11 is 25cm long and 5cm high; two slidable shaft supports 12 are inserted into the rotating shaft slide rail 11 and fixed through a knob 10; the use length l of the turning plate can be adjusted by adjusting the position of the shaft support in the sliding rail of the rotating shaft₃(ii) a The rotating shaft 8 and the sliding shaft 9 pass through the shaft support 12, and the turning plate 5 can rotate around the rotating shaft 8; two ends of a sliding shaft 9 are inserted into the turning plate sliding rail 4, the part of the tail end of the shaft extending out of the turning plate rotating rail 4 is provided with threads and a knob 10 is installed, and the angle of the turning plate 5 is fixed through the knob 10; two baffle plates 13 are welded on two sides of the top surface of the turning plate 5; the baffle 13 of the embodiment is fan-shaped, has the radius of 35cm and the central angle of 90 degrees and is vertical to the central anglePerforming waterproof treatment on the welding part of the turning plate 5; two baffles 13 on the right-side turning plate 5 are staggered inwards by the thickness of one baffle.

A sliding support 14 is arranged at the upper part of the sliding shaft 9 in the track of the flap plate rotating rail 4; a knob 10 is arranged on the outer side of the sliding support 14 and used for fixing the position of the sliding support 14 in the flap rotating rail 4; the sliding support 14 is used for limiting the rotation angle of the flap 5.

The device is not in use and the fixing knob 10 is tightened in its entirety. The test method of the test device for simulating the process of throwing the sandbags by the bottom-opening barge comprises the following steps of:

the method comprises the following steps: fixing two ends of the bracket 1 to the water tank; screwing nuts on the bracket 1 one by one, and primarily adjusting the height of the horizontal slide rail 2 to enable the horizontal slide rail 2 to be above the test water level;

step two: a knob 10 at the tail end of the sliding shaft 9 is unscrewed; let the closing angle of model test prototype barge be alpha, the sliding shaft 9 in the sliding turnover plate rotating rail 4 and the angle between the adjusting turnover plate 5 and the horizontal be alphaScrewing down a knob 10 at the tail end of the sliding shaft 9 to fix the angle of the turning plate 5;

step three: converting the rotation radius of the cabin of the prototype barge into the rotation radius of the model turning plate according to a test scale; the knob 10 on the shaft support 12 is unscrewed, and the use length l of the turning plate 5 is adjusted₃(namely the rotating shaft 8 to the lower end of the turning plate 5) is the converted rotating radius of the model turning plate 5; the knob 10 on the shaft support 12 is tightened, the length l of the fixed flap 5 is used₃；

Step four: unscrewing a knob 10 at the end of the support shaft 7; sliding the two turning plate supports 3 to approach to the middle until the bottom ends of the turning plates 5 are contacted; a knob 10 on the turning plate support 3 is screwed down to fix the position of the turning plate support 3; at the moment, the distance l between the two turnover plates and the rotating shaft is 8₁Should satisfy

Step five: converting the draft of the cabin of the prototype barge according to a test scale; screwing nuts on the support 1 one by one, and adjusting the height of the horizontal slide rail 2 to enable the bottom of the turning plate 5 to be immersed into water to convert the depth;

step six: converting the maximum opening width of the cabin of the prototype barge into the maximum opening width b of the model according to a test scale; the shoe 14 is unscrewed and the shoe 14 is adjusted so that b +2l₃cosγ＝l₁(ii) a Loosening a knob 10 at the tail end of the sliding shaft 9, and rotating the turning plate 5 until the sliding support 14 abuts against the sliding shaft 9, wherein the turning plate 5 is in a maximum opening state;

step seven: the two turning plates 5 are rotated from the positions where the turning plates abut against each other to abut against the sliding support 14, so that the process of opening the bottom of the open-bottom barge can be simulated, and a model test of throwing the sandbags by the open-bottom barge can be carried out.

The adjustment steps of the test device are explained by specific test case data:

the prototype open-bottom barge dimensions were: the rotating radius of the ship bottom is 7m, the closing angle alpha is 90 degrees, and the maximum opening is 3 m; and (4) selecting a test length scale of 1:50, converting the rotation radius of the turning plate of the model into 14cm, and converting the maximum opening of the model into 6 cm. I.e. the length l of the flap 5 used during the adjustment of the test apparatus₃Adjusting to 14 cm; adjusting the position of the turning plate support to ensure that the distance l between the two turning plate rotating shafts is 8₁19.80 cm; the position of the sliding support 14 is adjusted so that the line connecting the sliding support 14 with the rotating shaft 8 and the horizontal plane form 60 degrees.