Testing system for simulating surface dredging of gravel foundation bed

Abstract

The utility model discloses a test system for simulating gravel foundation bed surface desilting, which comprises a test water tank, a sludge generation device, a sludge storage box, a desilting head, a sludge suction pump, an electromagnetic flowmeter, a sludge layer thickness measuring instrument and a data acquisition system, and a water outlet is arranged on the test water tank; guide rails are mounted on cross beams on two sides of the test water tank; racks are formed on the side edges of the guide rails; an advancing mechanism is arranged on the guide rail, a first motor is installed on the side edge of the advancing mechanism, and a gear matched with the rack is arranged at the bottom of the first motor; a vertical driving mechanism is arranged on the advancing mechanism and connected with the desilting head through a girder. The vertical driving mechanism comprises two vertical slideways, a lead screw and a hand wheel, a supporting plate is installed on the slideways in a sliding mode, the supporting plate is connected with the desilting head through a girder, and a second motor is installed on one side of the supporting plate; the sludge generation device comprises a plurality of barrels, a sludge stirrer and a plurality of densimeters; the dredge pump is mounted outside the test water tank; and the mud layer thickness measuring instrument is arranged in the test water tank.

Description

Technical Field

[0001] This utility model relates to the field of silt removal technology on the surface of crushed stone foundation bed in immersed tunnels, and in particular to a test system for simulating silt removal on the surface of crushed stone foundation bed. Background Technology

[0002] Underwater tunnels effectively solve the problems of crossing waterways and facilitating navigation over large areas, while minimizing the impact on the surrounding environment. Therefore, large-scale underwater tunnel projects, including those spanning seas and inland rivers, are increasing daily. Due to the unique economic and technological advantages of immersed tunnels, and with the gradual resolution and improvement of key technical issues in the design and construction of immersed tunnels, they are gaining increasing attention from more and more countries and have gradually become the preferred construction method for large-scale underwater tunnel projects. In the construction of immersed tunnels, foundation treatment is usually required to ensure a smooth tunnel trench surface. Common foundation treatment methods include pre-laying and post-filling. Pre-laying involves laying a crushed stone foundation bed before the immersed tube is placed, offering advantages such as minimal settlement and high construction efficiency. However, when using pre-laying, the high sand content in the water can cause backflow problems due to water flow disturbances, affecting normal construction, severely restricting the construction progress, and causing economic losses. Therefore, it is necessary to remove the silt from the surface of the crushed stone foundation bed during pre-laying construction.

[0003] Traditional dredging methods often use pump suction or water flushing to remove silt from the foundation bed. However, the top surface of the leveled foundation bed is composed of small-particle crushed stone leveling material. Uneven pump suction or water flushing force can lead to incomplete dredging or displacement of crushed stone, resulting in poor surface precision and making subsequent pipe installation impossible. For example, a utility model with a publication date of 2021-01-29, publication number CN212427289U, entitled "Mechanical-Hydraulic Dual-Action Precision Scraping Dredging Head and Dredging Device," utilizes scraping blades to agitate the silt, mixing it with water to form a highly fluid mud-water mixture. Simultaneously, the rotation of the scraping blades generates a water flow force that drives the mud-water mixture towards the central axis of the spiral conveying mechanism. Combined with the forward rotation of the left and right spiral blades, this transports the mud-water mixture to the docking section and discharges it through the outlet corresponding to the docking section, thus achieving foundation bed dredging. Existing dredging devices have not studied the structural and operational parameters of dredging, thus making it impossible to obtain reasonable structural and operational parameters, and making it difficult to match the operational parameters. Utility Model Content

[0004] The purpose of this application is to provide a test method for simulating dredging of a crushed stone bed surface, addressing the technical deficiencies existing in the prior art.

[0005] The technical solution adopted to achieve the purpose of this application is:

[0006] A test system for simulating dredging of a crushed stone bed surface includes a test water tank, a sludge generation device, a sludge storage tank, a dredging head, a sludge suction pump, an electromagnetic flowmeter, a sludge layer thickness measuring instrument, and a data acquisition system. The test water tank is provided with a drain outlet for discharging the test water in the test water tank.

[0007] Guide rails are installed on the crossbeams on both sides of the test water tank, and racks are formed on the sides of the guide rails; a traveling mechanism is provided on the guide rails, and a first motor is fixedly installed on the side of the traveling mechanism, and a gear that meshes with the rack is provided at the bottom of the first motor.

[0008] The traveling mechanism is equipped with a vertical drive mechanism, which is fixedly connected to the sludge removal head via a main beam. The vertical drive mechanism includes two symmetrically arranged vertical slides, a lead screw, and a handwheel. A support plate is slidably mounted on the slides, and the support plate is fixedly connected to the sludge removal head via the main beam. A second motor for driving the sludge removal head to rotate is fixedly mounted on one side of the support plate. A first transmission wheel is horizontally arranged at one end of the second motor, and a first transmission rod passes through the upper end of the main beam. The first transmission wheel and the first transmission rod are connected in a transmission manner. Two first synchronous pulleys are arranged on the first transmission rod, and second synchronous pulleys are coaxially arranged on the rotating shafts on both sides of the sludge removal head. The first and second synchronous pulleys are connected in a transmission manner via a first synchronous belt. A lead screw nut is fitted onto the lead screw, and the lead screw nut is fixedly connected to the support plate. The handwheel is fixedly installed on the outside of the traveling mechanism and is connected in a transmission manner to the lead screw.

[0009] The sludge generating device includes multiple barrels, a sludge agitator, and multiple densitometers. Each densitometer is fixedly installed on the side of a barrel via a bracket. The sludge agitator is suspended inside the barrel via a movable bracket. A third motor for driving the sludge agitator to rotate is fixedly installed on the movable bracket.

[0010] The sludge suction pump is fixedly installed outside the test water tank. The sludge outlet of the sludge removal head is connected to the inlet of the sludge suction pump through a steel wire hose. The outlet of the sludge suction pump is connected to one end of the electromagnetic flow meter through a fixed iron pipe. The other end of the electromagnetic flow meter is connected to the sludge storage tank through a fixed iron pipe.

[0011] The mud layer thickness measuring instrument is installed inside the test water tank.

[0012] In the above technical solution, an underwater video recording device is installed in the test tank to record the dredging test process of the dredging head.

[0013] In the above technical solution, the handwheel is connected to the lead screw via a transmission device. The transmission device includes a second transmission rod and a third transmission rod. One end of the second transmission rod is fixedly connected to the handwheel, and the other end of the second transmission rod is connected to the third transmission rod. A second transmission wheel is provided at the top of the third transmission rod, and a third transmission wheel is provided at the top of the lead screw. The second transmission wheel and the third transmission wheel are connected by a second synchronous belt.

[0014] In the above technical solution, the bottom of the mobile support is symmetrically provided with casters.

[0015] In the above technical solution, the sludge suction pump is equipped with a frequency converter for adjusting the flow rate of the sludge suction pump.

[0016] In the above technical solution, the sludge suction pump is a centrifugal pump.

[0017] In the above technical solution, the rotation speed of the sludge removal head is adjustable, and its adjustment range is 0 to 50 r / min.

[0018] In the above technical solution, the operating speed of the traveling mechanism is adjustable, and its adjustable range is 0 to 2 m / min.

[0019] In the above technical solution, the side material of the test water tank is glass, and the bottom material is stainless steel.

[0020] The beneficial effects of this utility model are as follows:

[0021] The experimental system of this invention can study the structural and operational parameters of dredging devices, thus obtaining reasonable structural and operational parameters and solving the problem of difficulty in matching the operational parameters of existing dredging devices. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of the experimental system for simulating the dredging of a crushed stone bed surface according to this utility model.

[0024] Figure 2 This is a structural diagram of the sludge generation device of this utility model.

[0025] In the diagram, 1-test water tank, 1-1-guide rail, 1-1-1-rack, 1-2-traveling mechanism, 1-2-1-first motor, 1-2-2-support plate, 1-2-3-second motor, 1-2-4-first transmission rod, 1-2-5-slide rail, 1-2-6-lead screw, 1-2-7-second transmission rod, 1-2-8-handwheel, 1-2-9-main beam, 1-2-10-third transmission rod, 1 -2-11-Second transmission wheel, 1-2-12-Third transmission wheel, 1-2-13-Second synchronous belt, 1-3-Drain outlet, 1-4-Vertical drive mechanism, 3-Sludge removal head, 3-1-Sludge outlet, 4-Sludge generating device, 4-1-Bucket body, 4-2-Sludge mixer, 4-3-Density meter, 4-4-Moving support, 4-4-1-Third motor, 4-4-2-Universal caster, 4-5-Support. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0027] An experimental system for simulating dredging of a gravel bed surface, see [link to relevant documentation]. Figure 1 The test water tank 1 includes a sludge generating device 4, a sludge storage tank, a sludge cleaning head 3, a sludge suction pump, an electromagnetic flow meter, a sludge layer thickness measuring instrument, and a data acquisition system. The test water tank 1 is equipped with drain outlets 1-3 for draining the test water in the test water tank 1.

[0028] The test water tank 1 has dimensions of 5m × 1.5m × 1.1m, with glass as the side material and stainless steel as the bottom material. The running speed of the traveling mechanism 1-2 is adjustable, with an adjustable range of 0 to 2m / min.

[0029] Guide rails 1-1 are installed on the crossbeams on both sides of the test water tank 1. A rack 1-1-1 is formed on the side of the guide rail 1-1. A traveling mechanism 1-2 is provided on the guide rail 1-1. A first motor 1-2-1 is fixedly installed on the side of the traveling mechanism 1-2. A gear that meshes with the rack 1-1-1 is provided at the bottom of the first motor 1-2-1 to drive the traveling mechanism 1-2 to travel along the direction of the guide rail 1-1.

[0030] The traveling mechanism 1-2 is equipped with a vertical drive mechanism 1-4, which is fixedly connected to the sludge removal head 3 via a main beam 1-2-9, and is used to lift or lower the sludge removal head 3. The vertical drive mechanism 1-4 includes two symmetrically arranged vertical slides 1-2-5, a lead screw 1-2-6, and a handwheel 1-2-8. A support plate 1-2-2 is slidably mounted on the slides 1-2-5, and the support plate 1-2-2 is fixedly connected to the sludge removal head 3 via the main beam 1-2-9. A second motor 1-2-3 is fixedly mounted on one side of the support plate 1-2-2 for driving the sludge removal head 3. The sludge head 3 rotates; a first transmission wheel is horizontally arranged at one end of the second motor 1-2-3, and a first transmission rod 1-2-4 is passed through the upper end of the main beam 1-2-9. The first transmission wheel is connected to the first transmission rod 1-2-4; two first synchronous pulleys are arranged on the first transmission rod 1-2-4; second synchronous pulleys are coaxially arranged on the rotating shafts on both sides of the sludge head 3, and the first and second synchronous pulleys are connected by a first synchronous belt (the main beam 1-2-9 is a hollow structure, and the first and second synchronous pulleys are located inside the main beam 1-2-9, so they cannot be driven from...). Figure 1 (As seen in the image), this allows the second motor 1-2-3 to drive the sludge removal head 3 to rotate, using the sludge removal head 3 to cut the sludge in the test water tank 1, and mixing the cut sludge with clean water to form a highly fluid mud-water mixture; a screw nut is fitted on the screw 1-2-6, and the screw nut is fixedly connected to the support plate 1-2-2; the handwheel 1-2-8 is fixedly installed on the outside of the traveling mechanism 1-2, and the handwheel 1-2-8 is connected to the screw 1-2-6 for transmission. By cranking the handwheel 1-2-8, the screw 1-2-6 is driven to rotate, causing the screw nut to drive the support plate 1-2-2 to move along the slide 1-2-5, thereby realizing the lifting and lowering of the sludge removal head 3 (the forward hand-cranking of the handwheel 1-2-8 lowers the sludge removal head 3, and the reverse hand-cranking of the handwheel 1-2-8 lifts the sludge removal head 3). The suction port of the dredging head 3 is always inside the mud layer of silt; the dredging head 3 in this embodiment is the dredging head 3 disclosed in the publication document with publication number CN212427289U, and the rotation speed of the dredging head 3 is adjustable, with an adjustment range of 0 to 50 r / min.

[0031] The handwheel 1-2-8 is connected to the lead screw 1-2-6 via a transmission device. The transmission device includes a second transmission rod 1-2-7 and a third transmission rod 1-2-10. One end of the second transmission rod 1-2-7 is fixedly connected to the handwheel 1-2-8, and the other end of the second transmission rod 1-2-7 is connected to the third transmission rod 1-2-10. A second transmission wheel 1-2-11 is provided at the top of the third transmission rod 1-2-10, and a second transmission wheel 1-2-11 is provided at the top of the lead screw 1-2-6. A third transmission wheel 1-2-12 is provided. The second transmission wheel 1-2-11 and the third transmission wheel 1-2-12 are connected by a second synchronous belt 1-2-13. The hand crank 1-2-8 drives the second transmission rod 1-2-7 to rotate, which in turn drives the third transmission rod 1-2-10 to rotate. The second synchronous belt 1-2-13 then drives the lead screw 1-2-6 to rotate, thereby causing the lead screw nut to drive the support plate 1-2-2 to move along the slide 1-2-5, thus realizing the lifting and lowering of the sludge removal head 3.

[0032] See Figure 2 The sludge generating device 4 includes multiple barrels 4-1, a sludge agitator 4-2, and multiple densitometers 4-3. Each densitometer 4-3 is fixedly mounted on the side of a barrel 4-1 via a bracket 4-5. The sludge agitator 4-2 is suspended inside a barrel 4-1 via a movable bracket 4-4. It is used to stir the soil and fine sand that have been thoroughly mixed and soaked in a certain proportion within the barrel. The densitometer is used to take samples and measure the mixture. By continuously adjusting the proportions of soil, fine sand, and water, sludge with a specific bulk density is generated. A third motor 4-4-1 is fixedly mounted on the movable bracket 4-4 to drive the sludge agitator 4-2 to rotate and stir the soil and fine sand within the barrel. The bulk density of the sludge is set according to experimental requirements. Universal wheels 4-4-2 are symmetrically arranged at the bottom of the movable bracket 4-4 to move the sludge agitator 4-2 to the barrel 4-1 where sludge needs to be generated. In this embodiment, the number of barrels 4-1 is preferably 3, which can provide sufficient sludge for the test of dredging the surface of the simulated gravel bed. The sludge mixer 4-2 can be moved to the barrel 4-1 where the fully mixed and soaked mud and fine sand need to be stirred by the movable support 4-4.

[0033] The sludge suction pump is fixedly installed outside the test water tank 1. The sludge outlet 3-1 of the sludge removal head 3 is connected to the water inlet of the sludge suction pump through a steel wire hose. The sludge suction pump is equipped with a frequency converter to adjust the flow rate of the sludge suction pump.

[0034] The outlet of the sludge suction pump is connected to one end of an electromagnetic flowmeter via a fixed iron pipe, and the electromagnetic flowmeter records the flow rate in the pipeline. The other end of the electromagnetic flowmeter is connected to a sludge storage tank via a fixed iron pipe, and the sludge storage tank receives the sludge sucked out by the sludge suction pump. The sludge suction pump is a centrifugal pump.

[0035] The mud layer thickness measuring instrument is installed in the test water tank 1. The mud layer thickness measuring instrument is used to measure the mud layer thickness of the silt laid in the test water tank 1 before the test and the mud layer thickness of the remaining silt in the test water tank 1 after the test.

[0036] The test tank 1 is equipped with underwater video recording equipment to record the dredging test process of the dredging head 3.

[0037] A test method for simulating dredging of a crushed stone bed surface includes the following steps:

[0038] Step 1: Lay graded crushed stone at the bottom of the test water tank 1, and then level it manually after laying.

[0039] The graded crushed stone is consistent with the site conditions, and the preferred thickness of the graded crushed stone is 20cm.

[0040] Step 2: Fix the sludge removal head 3 (with a diameter of d1 and a pitch of S1) to the traveling mechanism 1-2 on the guide rail 1-1 of the test water tank 1 via the main beam 1-2-9, and adjust the sludge removal head 3 to be horizontal. Fix the sludge suction pump to the outside of the test water tank 1, connect the sludge outlet 3-1 of the sludge removal head 3 to the inlet of the sludge suction pump, connect the outlet of the sludge suction pump to one end of the electromagnetic flowmeter, connect the other end of the electromagnetic flowmeter to the sludge storage tank, and install the sludge layer thickness measuring instrument inside the test water tank 1.

[0041] Step 3: Put soil, fine sand and water into the barrel 4-1 of the sludge generating device 4 in a certain proportion, mix and soak the soil and fine sand thoroughly, use the sludge agitator 4-2 to stir the soil and fine sand in the barrel 4-1 after they have been fully mixed and soaked, and use a densitometer to take samples and measure. By continuously adjusting the proportion of soil, fine sand and water, sludge with a specific bulk density is generated.

[0042] Step 4: Spread the sludge generated in Step 3 evenly into the test water tank 1. Use a mud layer thickness measuring instrument to measure the thickness of the sludge layer in the test water tank 1. Then, lay geotextile on the surface of the sludge layer to prevent the sludge from churning when adding clean water to the test water tank 1.

[0043] The thickness of the silt in the test tank 1 in step 4 is preferably 10cm.

[0044] Step 5: Add clean water to the test tank 1 through the water supply pipe to raise the water level to the preset height. Remove the geotextile covering the surface of the silt layer and lower the sludge removal head 3 to the preset height by turning the handwheel 1-2-8 forward (at this time, the bottom of the sludge removal head 3 is 1cm away from the top of the graded crushed stone, so that the suction port of the sludge removal head 3 is always within the silt layer). Then, start the suction pump, sludge removal head 3 and traveling mechanism 1-2 in sequence to start the sludge removal test. During the sludge removal test, use an electromagnetic flowmeter to collect the pipeline flow rate. Collect the pipeline flow rate collected by the electromagnetic flowmeter in real time through the data acquisition system. Based on the pipeline flow rate and the preset suction pump flow rate, the rotation speed of the sludge removal head 3 and the traveling speed of the traveling mechanism 1-2, establish the relationship between the pipeline flow rate and the suction pump flow rate, the rotation speed of the sludge removal head 3 and the traveling speed of the traveling mechanism 1-2.

[0045] The expression for the relationship between the pipeline flow rate, the sludge pump flow rate, the rotational speed of the sludge removal head 3, and the traveling speed of the traveling mechanism 1-2 is as follows:

[0046] Q1 = f(q1, n1, v1)

[0047] In the formula, Q1 represents the pipeline flow rate collected by the electromagnetic flow meter, q1 represents the preset sludge pump flow rate, n1 represents the preset rotation speed of the sludge removal head 3, and v1 represents the preset travel speed of the traveling mechanism 1-2.

[0048] Specifically, during the dredging test, the gear at the bottom of the first motor 1-2-1 engages with the rack 1-1-1 formed on the side of the guide rail 1-1, driving the traveling mechanism 1-2 to move along the direction of the guide rail 1-1; the transmission wheel of the second motor 1-2-3 is connected to the first transmission rod 1-2-4, driving the first transmission rod 1-2-4 and the first synchronous pulley on the first transmission rod 1-2-4 to rotate, and driving the second synchronous pulley to rotate through the first synchronous belt, thereby driving the rotating shafts on both sides of the dredging head 3 to rotate, driving the dredging head 3 to rotate, and using the dredging head 3 to cut the silt in the test water tank 1, so that the cut silt mixes with clean water to form a highly fluid mud-water mixture, and the mud-water mixture formed in the dredging head 3 is pumped out by the mud suction pump and stored in the mud storage tank.

[0049] Step 6: During the dredging test, clean water is continuously added to the test tank 1 through the water supply pipe to ensure that the water level in the test tank 1 remains constant. After the dredging test is completed, the sludge pump, dredging head 3 and traveling mechanism 1-2 are stopped in reverse order, and the handwheel 1-2-8 is cranked in reverse to raise the dredging head 3 to the initial height.

[0050] Step 7: Slowly discharge the test water in the test water tank 1 through the drain outlet 1-3. Measure the thickness of the remaining sludge layer in the test water tank 1 again using a sludge layer thickness measuring instrument. Determine the amount of sludge to be removed based on the thickness of the sludge layer laid in the test water tank 1 and the thickness of the remaining sludge layer in the test water tank 1. Then, evaluate the sludge removal effect of the sludge removal head 3 based on the relationship between the pipeline flow rate and the sludge suction pump flow rate, the rotation speed of the sludge removal head 3 and the travel speed of the traveling mechanism 1-2, as well as the amount of sludge removed.

[0051] Step 8: Adjust the flow rate of the sludge suction pump, the rotation speed of the sludge removal head 3, and the travel speed of the traveling mechanism 1-2. Repeat steps 3-7 to measure the sludge removal effect of the sludge removal head 3 under different power parameters.

[0052] Step 9, change to different diameters (d) n Different pitches (S) n Repeat steps 3-8 for the dredging head 3, and measure the dredging effect of the dredging head 3 under different structural parameters and operating parameters.

[0053] Furthermore, an underwater video recording device was installed in the test tank 1 to record the dredging process during the dredging test.

[0054] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0056] The above description is only a preferred embodiment of the present utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A test system for simulating dredging of a gravel bed surface, characterized in that, It includes a test water tank, a sludge generating device, a sludge storage tank, a sludge cleaning head, a sludge suction pump, an electromagnetic flowmeter, a sludge layer thickness measuring instrument, and a data acquisition system. The test water tank is equipped with a drain outlet for discharging the test water in the test water tank. Guide rails are installed on the crossbeams on both sides of the test water tank, and racks are formed on the sides of the guide rails; a traveling mechanism is provided on the guide rails, and a first motor is fixedly installed on the side of the traveling mechanism, and a gear that meshes with the rack is provided at the bottom of the first motor. The traveling mechanism is equipped with a vertical drive mechanism, which is fixedly connected to the sludge removal head via a main beam. The vertical drive mechanism includes two symmetrically arranged vertical slides, a lead screw, and a handwheel. A support plate is slidably mounted on the slides, and the support plate is fixedly connected to the sludge removal head via the main beam. A second motor for driving the sludge removal head to rotate is fixedly mounted on one side of the support plate. A first transmission wheel is horizontally arranged at one end of the second motor, and a first transmission rod passes through the upper end of the main beam. The first transmission wheel and the first transmission rod are connected in a transmission manner. Two first synchronous pulleys are arranged on the first transmission rod, and second synchronous pulleys are coaxially arranged on the rotating shafts on both sides of the sludge removal head. The first and second synchronous pulleys are connected in a transmission manner via a first synchronous belt. A lead screw nut is fitted onto the lead screw, and the lead screw nut is fixedly connected to the support plate. The handwheel is fixedly installed on the outside of the traveling mechanism and is connected in a transmission manner to the lead screw. The sludge generating device includes multiple barrels, a sludge agitator, and multiple densitometers. Each densitometer is fixedly installed on the side of a barrel via a bracket. The sludge agitator is suspended inside the barrel via a movable bracket. A third motor for driving the sludge agitator to rotate is fixedly installed on the movable bracket. The sludge suction pump is fixedly installed outside the test water tank. The sludge outlet of the sludge removal head is connected to the inlet of the sludge suction pump through a steel wire hose. The outlet of the sludge suction pump is connected to one end of the electromagnetic flow meter through a fixed iron pipe. The other end of the electromagnetic flow meter is connected to the sludge storage tank through a fixed iron pipe. The mud layer thickness measuring instrument is installed inside the test water tank.

2. The experimental system for simulating dredging of a crushed stone bed surface according to claim 1, characterized in that, The test tank is equipped with an underwater video recording device for recording the dredging test process of the dredging head.

3. The experimental system for simulating dredging of a crushed stone bed surface according to claim 1, characterized in that, The handwheel is connected to the lead screw via a transmission device. The transmission device includes a second transmission rod and a third transmission rod. One end of the second transmission rod is fixedly connected to the handwheel, and the other end of the second transmission rod is connected to the third transmission rod. A second transmission wheel is provided at the top of the third transmission rod, and a third transmission wheel is provided at the top of the lead screw. The second transmission wheel and the third transmission wheel are connected by a second synchronous belt.

4. The experimental system for simulating dredging of a crushed stone bed surface according to claim 1, characterized in that, The bottom of the movable support is symmetrically equipped with casters.

5. The experimental system for simulating dredging of a crushed stone bed surface according to claim 1, characterized in that, The sludge suction pump is equipped with a frequency converter for adjusting the flow rate of the sludge suction pump.

6. The experimental system for simulating dredging of a crushed stone bed surface according to claim 1, characterized in that, The sludge suction pump is a centrifugal pump.

7. The experimental system for simulating dredging of a crushed stone bed surface according to claim 1, characterized in that, The rotation speed of the sludge removal head is adjustable, with an adjustment range of 0 to 50 r / min.

8. The experimental system for simulating dredging of a crushed stone bed surface according to claim 1, characterized in that, The operating speed of the traveling mechanism is adjustable, with an adjustable range of 0 to 2 m / min.

9. The experimental system for simulating dredging of a crushed stone bed surface according to claim 1, characterized in that, The test tank is made of glass on the sides and stainless steel on the bottom.

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