Full-automatic relative compactness tester

Abstract

The invention discloses a full-automatic relative compactness tester, and relates to the technical field of silt and sandy soil compactness testing. Comprising a box body, a shakeout flow controller, a core control barrel, a shakeout drainage and leveling integrated device, a vibration and drop hammer device, a circular ring converter, various stretchable clamps, an assembly type scraper, an extension barrel sleeve, a barrel cover, a PVC barrel with scales, a weighing type lifting platform, an infrared ray measuring device, an excess material collecting device and a computer. According to the invention, the maximum dry density test and the minimum dry density test or the minimum void ratio test and the maximum void ratio test of the soil sample can be realized, data are acquired through the infrared measuring device and the weighing type lifting platform, the data are processed and analyzed by utilizing the computer, and the soil sample can be accurately measured under the condition of highly maintaining the properties and parameter stability of the original soil sample. Different experimental apparatuses are matched and combined through the core control cylinder, so that the soil sample parameter testing efficiency is improved, the labor cost is reduced, and the soil sample parameter collecting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of silt and sand density testing, and in particular to a full-automatic relative density testing instrument. Background Art

[0002] In actual engineering or research experiments, in order to explore the characteristics of different types of soil at different particle sizes, it is often necessary to conduct density tests on the original soil. In traditional density tests of soil particles of different types of soil at different particle sizes, a lot of manual operations and instruments are often required. It is necessary to use the measuring cylinder method to vibrate the sample in layers, remove the casing to vibrate the sample, use the sand surface smoother to smooth the sand surface, and measure the sample volume. However, this not only consumes a lot of manpower and material resources, but also produces a lot of losses during the multiple soil sample transfers, greatly reducing the experimental production efficiency. At present, the maximum dry density test and minimum dry density test or the minimum porosity and maximum porosity test of soil samples must be tested separately, which requires a lot of manual operations. The operation is cumbersome and the mold cleaning is required, which reduces the experimental efficiency. The existing equipment cannot realize multiple experimental automation, and the experimental automation and data acquisition devices are integrated.

[0003] Therefore, there is an urgent need to provide a fully automatic relative density tester. Summary of the invention

[0004] The purpose of the present invention is to provide a fully automatic relative density tester to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned object, the present invention provides a fully automatic relative density tester, comprising a box body, a weighable lifting platform is arranged at the inner bottom of the box body, a PVC bucket with a scale is placed on the top of the weighable lifting platform, a sand inlet bucket is arranged on the top of the box body, the sand inlet bucket is located directly above the PVC bucket with a scale, and a falling sand flow controller is detachably installed at the bottom of the sand inlet bucket;

[0006] A core control barrel is arranged in the box body, and the core control barrel is arranged on one side of the weighable lifting platform, and the core control barrel is used to install a sand falling drainage and smoothing integrated device, a vibration and falling hammer device, and a clamping device;

[0007] An infrared measuring device is installed on the inner wall of the box, and the infrared measuring device is used to collect the height data of the PVC bucket with scale, the relative position height data of the PVC bucket with scale and the core control bucket, and the height data of the sand filled in the PVC bucket with scale during the experiment;

[0008] A computer is arranged outside the box, and the weighable lifting platform and the infrared measuring device are connected to the computer through wires.

[0009] Preferably, the sliding sleeve on the core control barrel is provided with a lower circular converter and an upper circular converter, the sand falling drainage and smoothing integrated device and the vibration and falling hammer device are installed on the core control barrel through the upper circular converter, and the clamping device is installed on the core control barrel through the lower circular converter; the lower circular converter and the upper circular converter are both electrically connected to the computer.

[0010] Preferably, the clamping device includes an expandable clamp 1 and two expandable clamps 2 installed on the lower ring converter; the expandable clamp 1 is used to clamp and flip the PVC barrel with scale; the two expandable clamps 2 are used to clamp the extended barrel sleeve and the barrel cover respectively, and the extended barrel sleeve and the barrel cover are both compatible with the PVC barrel with scale; the bottom edge of the extended barrel sleeve is provided with a sand falling groove.

[0011] Preferably, rubber balls are fixed to the ends of the expandable clamp 1 and the two expandable clamps 2.

[0012] Preferably, an assembled scraper is installed on the lower ring converter, and the assembled scraper is used to grind the sand and soil loaded into the PVC barrel with scale.

[0013] Preferably, two sleeve rings are installed on the upper annular converter, and the sand falling drainage and smoothing integrated device and the vibration and falling hammer device are respectively installed on the upper annular converter through the two sleeve rings.

[0014] Preferably, the integrated sand drainage and smoothing device comprises a drainage barrel, the interior of which is connected to a drainage knife disc, a smoother is installed at the bottom end of the drainage knife disc, and the outer diameter of the drainage barrel is compatible with the inner diameter of the graduated PVC barrel.

[0015] Preferably, the vibration and drop hammer device comprises a vibration and drop hammer cylinder, a plurality of connecting rods are installed on the outer wall of the vibration and drop hammer cylinder, a rubber cylinder is installed at the end of the connecting rod, and a striking hammer is slidably connected to the inside of the vibration and drop hammer cylinder.

[0016] Preferably, the sand falling flow controller includes a sand falling plate, a sand falling flow control slider and a high-speed camera. The sand falling plate is detachably mounted on the bottom end of the sand inlet bucket, and the sand falling flow control slider is mounted at the bottom opening of the sand falling plate. The sand falling flow control slider is two relatively sliding sliders, and the two sliders are cylindrical in structure as a whole. Conical grooves are provided on opposite sides of the two sliders, and the high-speed camera is mounted inside the slider; the sand falling flow control slider and the high-speed camera are electrically connected to the computer.

[0017] Preferably, a residual material collection box is installed on the inner wall of the box body, the residual material collection box is arranged above the infrared measuring device, and the residual material collection box is connected to the sand inlet bucket; a residual material collection barrel is arranged on the outside of the box body, and a residual material collection pipe is connected between the residual material collection barrel and the residual material collection box.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] The fully automatic relative density tester provided by the present invention can automatically replace different experimental instruments as needed through the core control barrel, quickly collect experimental data through an infrared measuring device and a weighable lifting platform, explore the influence of different heights and flows on the relative density through a weighable lifting platform and a falling sand flow controller, quickly calculate the minimum dry density and the maximum dry density as well as the maximum porosity and the minimum porosity, and calculate the relative density of the sand through a computer; the present invention collects height data of each instrument through an infrared measuring device and mass data through a weighable lifting platform, and calculates the relative density of the sand through computer analysis, thereby saving a lot of manpower and material resources and facilitating real-time control of experimental conditions, adjustment parameters, observation data and usage through a computer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the main structure of the fully automatic relative density tester of the present invention;

[0022] Figure 2 This is a schematic diagram of the core control barrel and related structures of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the integrated device for draining and leveling sand according to the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the vibration and drop hammer device of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the falling sand flow controller of the present invention;

[0026] In the figure: 1. Weighable lifting platform; 2. Core control barrel; 3. Lower ring converter; 4. Upper ring converter; 5. Expandable clamp 1; 6. Expandable clamp 2; 7. Rubber ball; 8. Ring; 9. Assembled scraper; 10. Extended barrel sleeve; 11. Barrel cover; 12. PVC barrel with scale; 13. Sand drainage and leveling device; 1301. Drainage barrel; 1302. Drainage knife disc; 1303. Leveler; 14. Vibration and drop hammer device ; 1401, vibration and falling hammer cylinder; 1402, connecting rod; 1403, rubber cylinder; 1404, striking hammer; 15, sand feeding bucket; 16, falling sand flow controller; 1601, falling sand plate; 1602, falling sand flow control slider; 1603, high-speed camera; 17, box; 18, infrared transmitter; 19, infrared receiver; 20, residual material collection box; 21, residual material collection pipe; 22, residual material collection bucket; 23, electric wires; 24, computer. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] like Figures 1 to 5 As shown, the present invention provides a fully automatic relative density tester, including a box body 17, a weighable lifting platform 1 is arranged at the inner bottom of the box body 17, a PVC bucket 12 with scale is placed on the top of the weighable lifting platform 1, a sand inlet bucket 15 is arranged on the top of the box body 17, the sand inlet bucket 15 is located directly above the PVC bucket 12 with scale, and a falling sand flow controller 16 is detachably installed at the bottom of the sand inlet bucket 15;

[0029] A core control barrel 2 is arranged in the box 17, and the core control barrel 2 is arranged on one side of the weighable lifting platform 1. The core control barrel 2 is used to install the sand drainage and leveling integrated device 13, the vibration and falling hammer device 14 and the clamping device;

[0030] An infrared measuring device is installed on the inner wall of the box 17, and the infrared measuring device includes an infrared transmitter 18 and an infrared receiver 19 respectively installed on two opposite inner walls of the box 17. The infrared transmitter 18 and the infrared receiver 19 are on the same plane as the center point of the weighable lifting platform 1. The infrared transmitter 18 releases infrared rays to irradiate the vertical plane where the center points of the weighable lifting platform 1 and the scaled PVC bucket 12 are located. The infrared measuring device is used to collect the height data of the scaled PVC bucket 12, the relative position height data of the scaled PVC bucket 12 and the core control bucket 2, and the height data of the sand filled in the scaled PVC bucket 12 during the experiment;

[0031] A computer 24 is arranged outside the box 17 , and the weighable lifting platform 1 , the infrared transmitter 18 and the infrared receiver 19 are all connected to the computer 24 via wires 23 .

[0032] When the present invention is in use, different experimental instruments can be automatically replaced as needed through the core control barrel 2, and experimental data can be quickly collected through the infrared measuring device and the weighable lifting platform 1. The influence of different heights and flows on relative density can be explored through the weighable lifting platform 1 and the falling sand flow controller 16, and the minimum dry density and maximum dry density as well as the maximum porosity and minimum porosity can be quickly calculated, and the relative density of the sand can be calculated through the computer 24; the present invention collects the height data of each instrument through the infrared measuring device and the mass data of the weighable lifting platform 1, and analyzes and calculates the relative density of the sand through the computer 24, thereby saving a lot of manpower and material resources, and facilitating the real-time control of the experimental situation, adjustment parameters, observation data and usage through the computer 24.

[0033] According to a further optimization scheme, a lower circular converter 3 and an upper circular converter 4 are provided on the sliding sleeve of the core control barrel 2; the sand falling drainage and smoothing integrated device 13 and the vibration and falling hammer device 14 are installed on the core control barrel 2 through the upper circular converter 4; the clamping device is installed on the core control barrel 2 through the lower circular converter 3; the lower circular converter 3 and the upper circular converter 4 are both electrically connected to the computer 24.

[0034] A further optimized solution is that the clamping device includes an expandable clamp 1 5 and two expandable clamps 2 6 installed on the lower ring converter 3; the expandable clamp 1 5 is used to clamp and flip the PVC barrel 12 with a scale; the two expandable clamps 2 6 are used to clamp the extended barrel sleeve 10 and the barrel cover 11 respectively, and the extended barrel sleeve 10 and the barrel cover 11 are both compatible with the PVC barrel 12 with a scale; a sand dropout trough is provided on the bottom edge of the extended barrel sleeve 10.

[0035] The extended barrel sleeve 10 is used to add a layer of sand upward when the last layer of sand in the PVC barrel 12 with a scale is vibrated and compacted, and compacted again to ensure the same compaction effect of each layer, avoiding inconsistent compaction effects between the lower and upper layers of sand; the setting of the sand dropout chute can buffer the excess sand scraped off by the assembled scraper 9 to prevent it from scattering to the bottom of the device and causing pollution and affecting the experiment; when the barrel cover 11 is used to determine the minimum density, the PVC barrel 12 with a scale needs to be inverted, and the barrel cover 11 can effectively prevent the sand from pouring out.

[0036] According to a further optimized solution, rubber balls 7 are fixed to the ends of the expandable clamp 1 5 and the two expandable clamps 2 6 .

[0037] The arrangement of the rubber ball 7 can increase the friction force, thereby ensuring the stability and operability of the clamped experimental equipment.

[0038] To further optimize the solution, an assembled scraper 9 is installed on the lower ring converter 3, and the assembled scraper 9 is used to grind the sand and soil that has been loaded into the PVC bucket 12 with a scale.

[0039] According to a further optimization scheme, two sleeve rings 8 are installed on the upper ring converter 4, and the sand drainage and leveling integrated device 13 and the vibration and falling hammer device 14 are installed on the upper ring converter 4 through the two sleeve rings 8 respectively.

[0040] A further optimized solution is that the integrated sand drainage and smoothing device 13 includes a drainage barrel 1301, the interior of the drainage barrel 1301 is connected with a drainage knife disc 1302, the bottom end of the drainage knife disc 1302 is installed with a smoother 1303, and the outer diameter of the drainage barrel 1301 is compatible with the inner diameter of the PVC barrel 12 with a scale.

[0041] The drainage barrel 1301 can be used to drain the upper sand and prevent the sand from being lost during the pouring process, and it also plays a certain role in dust prevention. The internal part of the sand drainage and leveling device 13 is connected to the drainage knife disc 1302, which is used to control the flow rate of the poured sand and prevent it from flowing too fast. The rotation of the drainage knife disc 1302 is driven by the rotation of the ring 8, and then the rotation of the leveler 1303 is driven to level the top layer of sand.

[0042] According to a further optimization scheme, the vibration and drop hammer device 14 includes a vibration and drop hammer cylinder 1401, a plurality of connecting rods 1402 are installed on the outer wall of the vibration and drop hammer cylinder 1401, a rubber cylinder 1403 is installed at the end of the connecting rod 1402, and a striking hammer 1404 is slidably connected inside the vibration and drop hammer cylinder 1401.

[0043] The compacting hammer 1404 moves up and down through the slide rail of the core control barrel 2 to vibrate the sand in the scaled PVC barrel 12 to make it continuously dense and measure the maximum dry density; the vibration and drop hammer device 14 is inserted into the ring 8, and drives the connecting rod 1402 to vibrate through electrical connection with the ring 8. In the experiment of measuring the maximum dry density, the connecting rod 1402 drives the rubber cylinder 1403 to vibrate and the drop hammer cylinder 1401 to assist in consolidating and compacting the sand, thereby making the maximum dry density determination more accurate; the setting of the rubber cylinder 1403 can make the vibration force in all directions uniform.

[0044] Further optimization scheme, the sand falling flow controller 16 includes a sand falling plate 1601, a sand falling flow control slider 1602 and a high-speed camera 1603. The sand falling plate 1601 is detachably installed at the bottom end of the sand inlet bucket 15, and the sand falling flow control slider 1602 is installed at the bottom opening of the sand falling plate 1601. The sand falling flow control slider 1602 is two relatively sliding sliders. The two sliders are cylindrical in structure as a whole. Conical grooves are provided on the opposite sides of the two sliders. The high-speed camera 1603 is installed inside the slider; the sand falling flow control slider 1602 and the high-speed camera 1603 are both electrically connected to the computer 24.

[0045] The sand inlet bucket 15 is filled with sand, and the excess sand flows into the residual material collection box 20 through an external pipe, and finally enters the residual material collection bucket 22 through the residual material collection pipe 21; the computer 24 controls the radial movement of the slider to control the opening size of the sand falling plate 1601, thereby controlling the sand falling flow rate.

[0046] To further optimize the solution, a residual material collection box 20 is installed on the inner wall of the box body 17, the residual material collection box 20 is arranged above the infrared measuring device, and the residual material collection box 20 is connected to the sand inlet bucket 15; a residual material collection barrel 22 is arranged on the outside of the box body 17, and a residual material collection pipe 21 is connected between the residual material collection barrel 22 and the residual material collection box 20.

[0047] In the specific operation process of the fully automatic relative density tester provided by the present invention, the first thing that needs to be done is the connection of the circuit. Specifically, the wire 23 should be connected to the computer 24, the infrared measuring device and the sand pumping device. In addition, the sand pumping device needs to be connected to the weighable lifting platform 1, and the weighable lifting platform 1 needs to be connected to the infrared measuring device. After completing the above connections, the computer 24 can be started. Then, according to the required relative density of the sand and the height of the soil layer, the calculation formula in the computer 24 is used to determine the soil particle specific gravity (G S ). The calculation formula is as follows:

[0048] According to the minimum dry density of sand Can be found

[0049] According to the minimum dry density of sand Can be found

[0050] According to the relative density of the target The porosity ratio can be obtained as e=e max -D r ·(e max -e min )

[0051] The density of the required sand can be calculated Then, according to the required height h of the sand, the mass of sand to be extracted is calculated: m = ρV = ρLDh

[0052] Note:

[0053] ρ dmin -- minimum dry density of sand;

[0054] ρ dmax -- Maximum dry density of sand;

[0055] e--natural porosity ratio;

[0056] e max -- Maximum porosity ratio;

[0057] e min --Minimum porosity ratio;

[0058] m d --Quality of dry sand;

[0059] V d -- Volume of dry sand;

[0060] ρ w -- water density;

[0061] G s -- relative density of soil particles;

[0062] D r --Relative density;

[0063] w--natural moisture content of sand;

[0064] After obtaining the required sand quality parameters, the system will automatically transmit these data to the sand pumping device and the infrared measuring device. Subsequently, the operator needs to lift the weighable lifting platform 1 to a predetermined height through the core control barrel 2 and fix it to ensure that the infrared rays can irradiate into the transparent model box. Next, the system will automatically start the sand pumping device to extract sand from the sand bucket, and the sand is transported to the sand inlet bucket 15 through the sand pumping pipe. This process will continue until the predetermined sand quality is reached, at which time the sand pumping process will stop automatically. Subsequently, the core control barrel 2 will start automatically, and the sand entering the scaled PVC bucket 12 will be leveled and vibrated and compacted using the sand drainage and leveling integrated device 13 and the vibration and falling hammer device 14. When the infrared measuring device detects that the height of the sand has reached the set height, it indicates that the compaction process has been completed. At this point, the system will automatically stop working and complete the entire sand compaction process.

[0065] In the implementation process of the present invention, the falling sand flow controller 16 is equipped with a falling sand flow control slider 1602, which is connected to the computer 24 through an electrical signal, and can realize dynamic adjustment of the opening size of the falling sand flow control slider 1602, thereby accurately controlling the falling sand speed. In addition, a plurality of high-speed cameras 1603 are integrated inside the falling sand flow control slider 1602, and these high-speed cameras 1603 can continuously shoot the sand and soil during the falling sand process to obtain image data of the sand and soil. The captured images are then transmitted to the computer 24, and the computer 24 uses its built-in image processing and machine learning algorithms to automatically identify and analyze the sand and soil particles.

[0066] The program in the computer 24 uses deep learning technology, and through a well-trained neural network model, it can extract the shape and size of sand particles from the image captured by the high-speed camera 1603. Through these feature information, the computer 24 can accurately identify and measure sand particles of different sizes, and calculate the particle gradation distribution of the sand, thereby obtaining the particle gradation curve of the sand.

[0067] The present invention can realize the automatic implementation of the maximum dry density test and the minimum dry density test or the minimum void ratio test and the maximum void ratio test of the soil sample, collect data through an infrared measuring device and a weighable lifting platform 1, and use a computer 24 to process and analyze the data. Under the condition of highly maintaining the original soil sample properties and parameter stability, different experimental instruments are matched and combined through the core control barrel 2 to improve the soil sample parameter testing efficiency and reduce labor costs. In addition, the present invention can collect the device residue to prevent the experimental device from being blocked, improve the soil sample parameter collection efficiency, and ensure the neatness of the experimental instruments.

[0068] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A fully automatic relative density tester, characterized in that: The invention comprises a box body (17), wherein a weighable lifting platform (1) is arranged at the inner bottom of the box body (17), a PVC bucket (12) with scale is placed on the top of the weighable lifting platform (1), a sand inlet bucket (15) is arranged on the top of the box body (17), the sand inlet bucket (15) is located directly above the PVC bucket (12) with scale, and a falling sand flow controller (16) is detachably installed at the bottom of the sand inlet bucket (15); A core control barrel (2) is arranged in the box (17), and the core control barrel (2) is arranged on one side of the weighable lifting platform (1). The core control barrel (2) is used to install a sand-falling drainage and smoothing integrated device (13), a vibration and falling hammer device (14), and a clamping device; An infrared measuring device is installed on the inner wall of the box (17), and the infrared measuring device is used to collect height data of the PVC bucket (12) with scale, height data of the relative position between the PVC bucket (12) with scale and the core control bucket (2), and height data of the sand filled in the PVC bucket (12) with scale during the experiment; A computer (24) is arranged outside the box (17), and the weighable lifting platform (1) and the infrared measuring device are connected to the computer (24) via electric wires (23).

2. The fully automatic relative density tester according to claim 1, characterized in that: The upper sliding sleeve of the core control barrel (2) is provided with a lower ring converter (3) and an upper ring converter (4); the sand falling drainage and smoothing integrated device (13) and the vibration and falling hammer device (14) are installed on the core control barrel (2) through the upper ring converter (4); the clamping device is installed on the core control barrel (2) through the lower ring converter (3); the lower ring converter (3) and the upper ring converter (4) are both electrically connected to the computer (24).

3. The fully automatic relative density tester according to claim 2, characterized in that: The clamping device comprises a retractable clamp 1 (5) and two retractable clamps 2 (6) mounted on the lower ring converter (3); the retractable clamp 1 (5) is used to clamp and flip the PVC barrel (12) with scale; the two retractable clamps 2 (6) are used to clamp the extended barrel sleeve (10) and the barrel cover (11) respectively, and the extended barrel sleeve (10) and the barrel cover (11) are both compatible with the PVC barrel (12) with scale; the bottom edge of the extended barrel sleeve (10) is provided with a sand falling groove.

4. The fully automatic relative density tester according to claim 3, characterized in that: The ends of the expandable clamp 1 (5) and the two expandable clamps 2 (6) are both fixed with rubber balls (7).

5. The fully automatic relative density tester according to claim 2, characterized in that: The lower ring converter (3) is provided with an assembled scraper (9), and the assembled scraper (9) is used to grind the sand and soil loaded into the PVC barrel (12) with scale.

6. The fully automatic relative density tester according to claim 2, characterized in that: Two sleeve rings (8) are installed on the upper annular converter (4), and the sand falling drainage and smoothing integrated device (13) and the vibration and falling hammer device (14) are respectively installed on the upper annular converter (4) through the two sleeve rings (8).

7. The fully automatic relative density tester according to claim 6, characterized in that: The sand falling drainage and smoothing integrated device (13) comprises a drainage bucket (1301), the interior of the drainage bucket (1301) is connected to a drainage knife disc (1302), a smoothing device (1303) is installed at the bottom end of the drainage knife disc (1302), and the outer diameter of the drainage bucket (1301) is compatible with the inner diameter of the PVC bucket (12) with scale.

8. The fully automatic relative density tester according to claim 6, characterized in that: The vibration and drop hammer device (14) comprises a vibration and drop hammer cylinder (1401), a plurality of connecting rods (1402) are installed on the outer wall of the vibration and drop hammer cylinder (1401), a rubber cylinder (1403) is installed at the end of the connecting rod (1402), and a striking hammer (1404) is slidably connected inside the vibration and drop hammer cylinder (1401).

9. The fully automatic relative density tester according to claim 1, characterized in that: The falling sand flow controller (16) comprises a falling sand plate (1601), a falling sand flow control slider (1602) and a high-speed camera (1603). The falling sand plate (1601) is detachably mounted on the bottom end of the sand inlet bucket (15). The falling sand flow control slider (1602) is mounted at the bottom opening of the falling sand plate (1601). The falling sand flow control slider (1602) is two sliders that slide relative to each other. The two sliders are cylindrical in structure as a whole. Conical grooves are arranged on opposite sides of the two sliders. The high-speed camera (1603) is mounted inside the slider. The falling sand flow control slider (1602) and the high-speed camera (1603) are both electrically connected to the computer (24).

10. The fully automatic relative density tester according to claim 1, characterized in that: A residual material collection box (20) is installed on the inner wall of the box body (17), the residual material collection box (20) is arranged above the infrared measuring device, and the residual material collection box (20) is connected to the sand feeding bucket (15); a residual material collection bucket (22) is arranged on the outside of the box body (17), and a residual material collection pipe (21) is connected between the residual material collection bucket (22) and the residual material collection box (20).

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