A sample preparation device for soil compaction test

Abstract

The utility model discloses a kind of sample preparation devices for geotechnical compaction test, comprising: stirring and wetting device, filter bucket, humidification barrel and frame support, there is filter screen in filter bucket, the bottom cover of controllable switch in bottom, the bottom cover of controllable switch is also in humidification barrel bottom, filter bucket, humidification barrel are rotationally connected in the middle part of frame support by alternation device, stirring and wetting device is movably installed in the upper portion of frame support by stirring and wetting device holding arm, stirring and wetting device holding arm cooperate alternation device, so that stirring and wetting device works on filter bucket or humidification barrel entering working position, filter bucket can realize three steps of soil sample grinding, filtering and conversion to humidification barrel without interval connection;Humidification barrel can quickly take out sample after soil sample humidification;Stirring and wetting device automatically adds water and humidifies, without consuming excessive manpower and time.

Description

Technical Field

[0001] This utility model belongs to the field of civil engineering equipment, and specifically relates to a sample preparation device for soil compaction testing. Background Technology

[0002] As an indispensable part of the geotechnical construction process, the soil compaction test results are used for settlement calculation, stability analysis, construction volume calculation, and can even serve as the basis for construction quality acceptance standards.

[0003] The main steps of a geotechnical compaction test are: sample preparation, compaction test, and data processing. The main steps of the sample preparation stage are as follows: drying the soil sample, crushing the soil clods, sieving, and preparing soil samples with different moisture contents.

[0004] The preparation process, including crushing soil clods and sieving, requires constant labor using shovels. During this process, the crushed soil sample may exhibit uneven particle size, leaving behind large clods. The crushed sample then needs to be sieved to remove excessively large clods, making this process undeniably tedious and time-consuming. Furthermore, when preparing soil samples with varying moisture levels, uneven mixing may occur, resulting in some samples being overly wet. In addition, this experiment typically requires the preparation of 4 to 5 soil samples, meaning that the preparation process undoubtedly consumes a significant amount of the experimenter's time and effort.

[0005] While there are existing products and research and developments that can save labor intensity in the steps of crushing soil blocks and preparing soil samples with different moisture contents during soil sample preparation, they are few. Most processing solutions involve performing the crushing, sieving, and moisture conditioning processes separately, or using separate sieving equipment. However, this choice also means extending the processing process and increasing additional costs, and cannot fundamentally solve the above-mentioned technical problems.

[0006] With the widespread application of soil compaction testing in geotechnical construction, this invention addresses the problems of high labor costs, uneven mixing, and cumbersome processing procedures in soil sample preparation. It provides a device that integrates soil sample grinding, soil filtration, and soil moisture adjustment. Utility Model Content

[0007] The purpose of this invention is to provide a sample preparation device for soil compaction tests, which solves the technical problem of excessive manpower and time consumption in the sample preparation process.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A sample preparation device for a soil compaction test includes: A stirring and humidifying device, comprising a stirring mechanism for grinding the sample and a humidifying mechanism for quantitatively adding water.

[0009] A filter canister includes a canister body, a filter screen located inside the canister body near the bottom, and a bottom cover located at the bottom of the canister body and controlled to open or close by a bottom cover motor.

[0010] A humidity regulating tank includes a tank body, a feed inlet located on the upper part of the tank body, and a bottom cover located at the bottom of the tank body that is controlled to open or close by a bottom cover motor.

[0011] The switching device includes a filter cartridge holding ring for placing the filter cartridge and a humidity regulating cartridge holding ring for placing the humidity regulating cartridge. The filter cartridge holding ring is equipped with a polarization mechanism. The switching device is used to exchange the positions of the filter cartridge and the humidity regulating cartridge.

[0012] The frame supports the rotating device and the stirring and humidifying device.

[0013] The stirring and humidifying device is movably mounted on the frame support via a stirring and humidifying device arm. The rotating device is rotatably connected to the frame support. The stirring and humidifying device arm cooperates with the rotating device to enable the stirring and humidifying device to work on the filter or humidifying tank that has entered the working position.

[0014] Furthermore, the stirring and humidifying device is installed in the packaging box, and the packaging box is fixedly connected to the holding arm of the stirring and humidifying device and suspended on the upper part of the frame support.

[0015] The mixing mechanism includes a mixing motor and mixing blades. The mixing motor is located in a packaging box and has an output shaft. A through hole is provided at the center of the bottom wall of the packaging box, through which the output shaft protrudes downward. There are multiple sets of mixing blades, which are axially evenly distributed and fixed on the mixing blade shaft. The mixing blade shaft is detachably connected to the output shaft of the mixing motor.

[0016] The humidity control mechanism includes a water filling device, which comprises an injection pump, a water storage chamber connected to the injection pump, and a water filling control module. The injection pump has a spray nozzle located on the bottom wall of the packaging box, and the water storage chamber has a water inlet located on the top wall of the packaging box. The water filling control module is electrically connected to both the injection pump and the stirring motor. The water filling control module is electrically connected to the stirring motor and receives the value of the stirring motor's rotation time. The water filling control module is also electrically connected to the injection pump to control the injection pump to spray water.

[0017] The stirring and humidifying device is housed in the packaging box, making the device compact and suitable for laboratory environments.

[0018] Furthermore, the frame support includes two symmetrically and vertically fixed frame brackets, each frame bracket having a rotating shaft in the middle for rotatably connecting the switching device, and one of the frame brackets having a through hole for inserting a hand crank.

[0019] Furthermore, each of the frame supports has a connecting groove extending downwards from its top surface along its height direction. The connecting groove is used to install the arm of the stirring and humidifying device. A lead screw motor is fixedly installed on the bottom surface of the connecting groove. The output shaft of the lead screw motor is vertically arranged and fixedly connected to a lead screw. The two ends of the arm of the stirring and humidifying device are provided with threaded holes. The threaded holes are threadedly connected to the lead screw. When the lead screw motor rotates, it drives the arm of the stirring and humidifying device and its stirring and humidifying device to move upwards or downwards through the threaded holes and the lead screw.

[0020] Furthermore, the bottom cover is a circular plate, and a bottom cover rotating shaft is vertically arranged near the edge of the upper surface of the bottom cover. A first bevel gear is fixedly arranged on the bottom cover rotating shaft. The bottom cover motor is arranged on the radial side wall of the filter barrel near the lower opening. A second bevel gear is fixedly arranged on the output shaft of the bottom cover motor. The first bevel gear and the second bevel gear are meshed and connected. When the bottom cover motor rotates, the bottom cover is driven to rotate through the first bevel gear and the second bevel gear, so that the bottom cover is opened or closed.

[0021] The bottom cover motor is fixedly connected to the filter barrel body via a motor fixing block.

[0022] Furthermore, the bottom cover structure of the humidity regulating tank is the same as that of the bottom cover structure of the filter tank.

[0023] Furthermore, the polarization mechanism consists of multiple sets, which are circumferentially distributed on the axial end face of the filter barrel holding ring.

[0024] Each polarization mechanism includes an eccentric block, a polarization motor, and a motor chamber. The polarization motor is located in the motor chamber, and the eccentric block is fixedly connected to the rotating shaft of the polarization motor. The motor chamber is fixedly located on the axial end face of the filter barrel holding ring.

[0025] Furthermore, the rotation device is a frame structure made of pipe material, consisting of two symmetrical frames. Each frame has a pipe opening at the top, middle, and bottom. The rotation device is rotatably connected to the frame support by cooperating with the pivot in the middle of the frame support frame through the pipe opening in the middle.

[0026] The hand crank can be detachably connected to the bottom wall of one of the central openings of the switching device.

[0027] Both the filter barrel holding ring and the humidity regulating barrel holding ring have radially extending shafts on both sides. The filter barrel holding ring engages with the upper or lower opening of the switching device through its shaft, thus rotatably connecting the filter barrel holding ring to the switching device. The humidity regulating barrel holding ring engages with the lower or upper opening of the switching device through its shaft, thus rotatably connecting the humidity regulating barrel holding ring to the switching device.

[0028] Furthermore, the feed inlet of the humidity regulating tank has a funnel-shaped structure.

[0029] This utility model has the following beneficial effects: 1. Because a rotation device and a stirring and humidifying device are installed on the frame support, and the filter barrel and humidifying barrel are installed on the rotation device, and the positions of the filter barrel and humidifying barrel can be quickly rotated to the working position, the stirring and humidifying device can quickly work on the filter barrel or humidifying barrel located in the working position without consuming too much manpower and time.

[0030] 2. The filter bucket is equipped with a filter screen and a polarization mechanism, and has a bottom cover that can be opened or closed in a controlled manner. This allows for seamless connection between the three steps of soil sample grinding, filtration, and transfer to the conditioning bucket. The bottom cover of the conditioning bucket can be opened or closed in a controlled manner, allowing for quick removal of the sample after soil conditioning without consuming excessive manpower and time.

[0031] 3. The mixing and moisture-regulating device can controllably grind soil samples and adjust soil moisture content according to test requirements, thus automating part of the test process.

[0032] 4. The various parts of the device are integrated with the support frame, occupying a small area. The miniaturized design is suitable for laboratory use. The structure is compact and easy to operate. Furthermore, the various parts of the device and the support frame are detachably connected to each other, facilitating disassembly, maintenance, and care. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the filter barrel when the bottom cover is closed. Figure 3 This is an isometric view of the assembly structure of the filter barrel, filter screen, bottom cover, and bottom cover motor when the bottom cover is open. Figure 4 Top view of the filter canister holding ring; Figure 5 This is the front view of the humidification tank; Figure 6 This is a schematic diagram of the polarization mechanism. Figure 7 A schematic diagram of the assembly structure of the stirring and humidifying device and the frame support. Figure 8 This is a three-dimensional schematic diagram of the rotation device structure; Figure 9 A schematic diagram of the assembly structure of the lead screw motor, the arm of the stirring and humidifying device, and the connecting groove. Figure 10 A top view of the assembly structure of the stirring and humidifying device and its frame support; Figure 11 A bottom view of the assembly structure of the stirring and humidifying device and its frame support; In the picture: 1-Packaging box; 2-Agitator blade; 3-Water adding device; 4-Filter barrel; 5-Eccentric block; 6-Motor chamber; 8-Filter screen; 9-Bottom cover; 11-Bottom cover motor; 12-Humidity conditioning barrel; 13-Feeding inlet; 14-Agitator and humidity conditioning device arm; 15-Screw motor; 16-Filter barrel holding ring; 17-Humidity conditioning barrel holding ring; 19-Connecting groove; 20-Changeover device; 21-Frame support; 22-Motor fixing block; 23-Hand crank. Detailed Implementation

[0034] The technical solutions of the present utility model will be further described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0035] This embodiment provides a sample preparation device suitable for laboratory soil compaction tests.

[0036] like Figure 1 As shown, this device can be simply divided into three parts: a stirring and humidifying device, a filter tank 4, and a humidifying tank 12.

[0037] The frame support 21 is the main support structure of this device. The stirring and humidifying device is set on the upper part of the frame support 21 through the stirring and humidifying device support arm 14. The filter tank 4 and the humidifying tank 12 are set in the middle of the frame support 21 through the switching device 20. Because this device is in a vibrating state when it is working, in order to ensure its stability, the bottom of the frame support 21 is fixedly connected to the ground or the operating table, such as by pouring reinforced concrete on the ground; or it can be detachably fixed to the operating table by screws and nuts.

[0038] Please see Figure 1 , 7 9. The frame support 21 includes two symmetrically and vertically fixed frame brackets. Each frame bracket has a connecting groove 19 extending downward from its top surface along its height direction. The connecting groove 19 is used to install the stirring and humidifying device arm 14. A lead screw motor 15 is fixedly installed at the bottom of the connecting groove 19. The output shaft of the lead screw motor 15 is vertically arranged and connected to the lead screw. The stirring and humidifying device arm 14 has threaded holes at both ends. The threaded holes are threadedly connected to the lead screw of the lead screw motor 15. When the lead screw motor 15 rotates, it drives the stirring and humidifying device arm 14 and its stirring and humidifying device to move upward or downward through the threaded holes and the lead screw.

[0039] In other embodiments, electric push rods are installed inside the two frame supports of the frame support 21. The telescopic ends of the electric push rods are connected to both ends of the stirring and humidifying device holding arm 14, driving the stirring and humidifying device holding arm 14 and its stirring and humidifying device to move up or down.

[0040] A pivot is provided at the middle of the height direction of each frame bracket for rotating and connecting the rotating device 20. One of the frame brackets has a through hole for passing through the hand crank 23.

[0041] Please see Figure 1 , 6 -11, Stirring and Humidifying Device, which integrates a stirring mechanism and a humidifying mechanism. To adapt to laboratory use, it is integrated into a packaging box 1. The packaging box 1 is fixedly connected to the stirring and humidifying device arm 14 and suspended on the upper part of the frame support 21.

[0042] The stirring mechanism includes a stirring motor and stirring blades 2. The stirring motor is located in the packaging box 1. The stirring motor is equipped with an output shaft. A through hole is provided at the center of the bottom wall of the packaging box 1, through which the output shaft protrudes downward.

[0043] The housing of the mixing motor is made of aluminum alloy, which is corrosion-resistant and lightweight; the mixing and humidification device arm 14 can be disassembled for cleaning, and is made of high-quality carbon steel that has been processed and heat-treated, with galvanized surface for rust prevention.

[0044] The mixing blades 2 are made of 304 stainless steel. There are multiple sets of mixing blades 2; in this embodiment, there are three sets. The three sets of mixing blades 2 are axially evenly distributed and fixed on the mixing blade shaft. The mixing blade shaft is detachably connected to the output shaft of the mixing motor, for example, by using a locking block and slot snap-fit ​​connection, combined with a pin to prevent slippage; or by a threaded connection with internal and external threads, combined with a pin to prevent slippage. This detachable connection method facilitates disassembly, maintenance, and upkeep. The mixing motor drives the mixing blades 2 to rotate and grind the soil sample.

[0045] The humidity control mechanism includes a water supply device 3, which comprises an injection pump and a water storage chamber connected to the injection pump. The injection pump has a spray nozzle located on the bottom wall of the packaging box 1, and the water storage chamber has a water inlet located on the top wall of the packaging box 1. The injection pump of the water supply device 3 has a built-in water supply control module, which is electrically connected to both the injection pump and the stirring motor. The water supply control module is electrically connected to the stirring motor to monitor the rotation time of the stirring motor and set the rotation time value. The water supply control module is configured with a water supply control program and is electrically connected to the injection pump to control the injection pump to spray water. The amount of water sprayed by the injection pump, the spraying time, and the spraying interval are pre-adjusted and set according to the rotation time of the stirring motor and the test requirements for the sample.

[0046] The mixing and moisture-conditioning device can controllably grind soil samples and adjust their moisture content according to experimental requirements, thus automating the moisture-conditioning process in the experiment.

[0047] The stirring and humidifying device arm 14, lead screw, filter barrel holding ring 16, humidifying barrel holding ring 17, alternating device 20, and frame support 21 are all made of Q345B steel, which has both good load-bearing capacity and good toughness, and can absorb the vibration and impact during machine operation.

[0048] Please see Figure 1 , 7 The rotating device 20 is a frame structure made of pipe material, consisting of two symmetrical side frames. Each side frame has an open pipe opening at the top, middle, and bottom. The opening direction of the middle pipe opening is opposite to that of the upper and lower pipe openings. The rotating device 20 is rotatably connected to the frame support 21 by cooperating with the pivot in the middle of the frame support 21 through the middle pipe opening. The rotating device 20 rotates on the frame support 21, so that the position of the filter tank 4 or the humidification tank 12 on the rotating device 20 can be quickly rotated to the working position, so that the stirring and humidification device can quickly work on the filter tank 4 or the humidification tank 12 located in the working position without consuming too much manpower and time.

[0049] It should be noted that, in this application, the working position refers to the position of the stirring and humidifying device within the working distance range.

[0050] A locking block is also provided on the rotation device 20, and a locking groove that cooperates with the locking block is provided on the frame support 21 frame bracket. During the soil mixing process of the vibrating screen, the locking block and the locking groove cooperate to lock the rotation device 20 and prevent the rotation device 20 from rotating.

[0051] The hand crank 23 is detachably connected to the bottom wall of one of the central pipe openings of the switching device 20. The detachable connection can be achieved by the hand crank 23 having a threaded rod and the bottom wall of the pipe opening having a threaded hole, with the hand crank 23 threadedly connected to the bottom wall of the pipe opening; or by the hand crank 23 having a locking block and the bottom wall of the pipe opening having a locking groove, with the hand crank 23 locking to the bottom wall of the pipe opening.

[0052] The filter barrel holding ring 16 is used to hold the filter barrel 4, and a polarization mechanism is provided on the filter barrel holding ring 16; the humidity regulating barrel holding ring 17 is used to hold the humidity regulating barrel 12. Both the filter barrel holding ring 16 and the humidity regulating barrel holding ring 17 have a rotating shaft extending radially outward on both sides. The filter barrel holding ring 16 cooperates with the upper or lower opening of the switching device 20 through its rotating shaft, thereby rotatably connecting the filter barrel holding ring 16 and the switching device 20; the humidity regulating barrel holding ring 17 cooperates with the lower or upper opening of the switching device 20 through its rotating shaft, thereby rotatably connecting the humidity regulating barrel holding ring 17 and the switching device 20.

[0053] Please see Figure 2-6The filter canister 4 includes a filter screen 8, a bottom cover 9, and a bottom cover motor 11. The filter canister 4 has a tubular structure with openings at the top and bottom. The outer diameter of the upper opening of the filter canister 4 is larger than the maximum inner diameter of the filter canister holding ring 16, so that the filter canister 4 cannot slide off the filter canister holding ring 16.

[0054] Please see Figure 4 and 6 There are multiple polarization mechanisms, which are evenly distributed circumferentially on the axial end face of the filter barrel holding ring 16. Each polarization mechanism includes an eccentric block 5, a polarization motor, and a motor chamber 6. The polarization motor is set in the motor chamber 6, and the eccentric block 5 is fixedly connected to the rotating shaft of the polarization motor. The motor chamber 6 is fixedly set on the axial end face of the filter barrel holding ring 16. The rotating eccentric block 5 is the vibration source of the polarization mechanism. During assembly, the outer wall of the filter barrel 4 abuts against the motor chamber 6. When the polarization motor rotates, it drives the filter barrel 4 to vibrate. The vibration of the filter barrel 4 causes the sample to pass through the sieve.

[0055] Please see Figure 4 In this embodiment, four polarization mechanisms are provided on the filter barrel holding ring 16.

[0056] Please see Figure 2 and 3 The bottom cover 9 of the filter barrel 4 is a circular plate, and the diameter of the bottom cover 9 is equal to or slightly larger than the outer diameter of the bottom opening of the filter barrel 4. A bottom cover rotating shaft is vertically installed on the upper surface of the bottom cover 9 near the edge, and a first bevel gear is fixedly installed on the bottom cover rotating shaft. The bottom cover motor 11 is installed on the radial side wall of the filter barrel 4 near the bottom opening, and a second bevel gear is fixedly installed on the output shaft of the bottom cover motor 11. The first bevel gear and the second bevel gear are meshed and connected. When the bottom cover motor 11 rotates, it drives the bottom cover 9 to rotate through the first bevel gear and the second bevel gear, so that the bottom cover 9 opens or closes. The bottom cover motor 11 is equipped with a motor fixing block 22, which has a cavity. The bottom cover motor 11 includes a rotating shaft and a base. The rotating shaft is rotatably connected to the motor fixing block 22 through a bearing. The base is fixedly connected to the motor fixing block 22. The motor fixing block 22 is fixedly embedded in the side wall of the filter bucket 4 and is fixedly connected to the side wall of the filter bucket 4. The first bevel gear and the second bevel gear are set in the cavity in the motor fixing block 22. During assembly, when the bottom cover 9 is closed, it is not required that the bottom cover 9 and the lower wall of the filter bucket 4 be completely sealed. It is only required that the soil sample be sealed.

[0057] The bottom cover structure of the humidity regulating tank 12 is the same as that of the bottom cover 9 of the filter tank 4 in terms of structure, assembly method, usage method and effect.

[0058] The filter screen 8 is detachably connected near the lower opening of the filter barrel 4. In this embodiment, a metal frame is provided on the filter screen 8, and the metal frame is connected to the inner wall of the filter barrel 4 by screws and screw holes. In other embodiments, a locking block is provided on the metal frame, and a locking groove is provided on the inner wall of the filter barrel 4. The metal frame is connected to the inner wall of the filter barrel 4 by the locking block and the locking groove. The filter screen 8 is detachably connected, which facilitates the replacement of the filter screen 8 according to the different requirements of the test for the specifications of the filter screen 8.

[0059] When installing the filter screen 8, the lower surface of the filter screen 8 is slightly higher than the lower opening of the filter barrel 4, so that a small space is left between the filter screen 8 and the lower surface of the bottom cover 9 when the bottom cover 9 is closed.

[0060] The body and bottom cover 9 of the filter barrel 4 are made of Q235B steel, which ensures the strength and wear resistance of the barrel body in a relatively economical way. The filter screen 8 is made of 304 stainless steel, and the mesh size is selected according to the test requirements, which can be 30-100 mesh. In this embodiment, 50 mesh is selected.

[0061] Please see Figure 5 The humidification tank 12 includes a feed inlet 13, a bottom cover 9, and a bottom cover motor 11. The tank body, feed inlet 13, and bottom cover 9 of the humidification tank 12 are all made of the same material, Q235B steel. The feed inlet 13 has a wide-mouth structure and is flared, wider at the top and narrower at the bottom. The flared shape of the feed inlet 13 can ensure that the soil falling from the filter tank 4 will not leak outside the humidification tank 12 when the filter tank 4 vibrates.

[0062] The replacement device 20, frame support 21, filter cartridge 4, and humidity regulating cartridge 12 are assembled as follows: S1: The tube opening in the middle of one frame of the rotating device 20 for installing the hand crank 23 is fitted onto the rotating shaft of the side frame bracket of the frame support 21, which has a through hole for the hand crank 23 to pass through. S2: The hand crank 23 is inserted into the through hole of the frame support 21 and connected to the changing device 20; S3: The other side of the rotating device 20 has a pipe opening, which is fitted onto the pivot of the other side frame bracket of the frame support 21; S4: The radially extending rotating shafts on both sides of the filter barrel holding ring 16 are inserted into the pipe openings at the upper or lower part of the switching device 20, so that the filter barrel holding ring 16 is rotatably connected to the switching device 20; the radially extending rotating shafts on both sides of the humidification barrel holding ring 17 are inserted into the pipe openings at the lower or upper part of the switching device 20, so that the humidification barrel holding ring 17 is rotatably connected to the switching device 20. S5: Place the filter canister 4 into the filter canister holding ring 16; place the humidity regulating canister 12 into the humidity regulating canister holding ring 17, and the assembly is complete.

[0063] Since the center of gravity of the filter barrel 4 is lower than that of the filter barrel holding ring 16, and the filter barrel holding ring 16 is rotatably connected to the switching device 20, the filter barrel 4 always remains vertical under the action of gravity when the switching device 20 is rotated; similarly, the humidity regulating barrel 12 also always remains vertical.

[0064] Since the rotation device 20 is used to adjust the up and down positions of the filter tank 4 and the humidity tank 12, the frequency of use is not high and the range is not large. Installing a hand crank 23 and manually cranking the rotation device 20 is sufficient to handle the situation, while also saving equipment costs.

[0065] In other embodiments, the switching device 20 is used frequently, and a switching motor is used instead of the hand crank 23.

[0066] The procedure for using the specimen preparation device for the soil compaction test is as follows: S1: Based on the specific requirements of the test for the sample, set the total amount of water added by the injection pump to the humidification tank 12, the water addition time, and the water addition interval. S2: Add water into the water storage chamber of the water supply device 3; S3: Start the bottom cover motor 11 of filter tank 4 and close the bottom cover 9 of filter tank 4; start the bottom cover motor 11 of humidity regulating tank 12 and close the bottom cover 9 of humidity regulating tank 12; lock the switching device 20. S4: After drying, place a portion of soil to be processed into filter bucket 4; S5: Install the stirring and humidifying device support arm 14 onto the lead screw of the lead screw motor 15; S6: Connect to power; S7: Crush soil clods S7-1: Start the screw motor 15 in the connecting groove 19 to rotate forward, which drives the arm 14 of the stirring and humidifying device to descend, and the stirring blade 2 is inserted into the soil in the filter bucket 4; S7-2: Start the stirring motor to rotate, which will drive the stirring blade 2 to rotate; S7-3: When the stirring time meets the requirements, the stirring motor stops, and the lead screw motor 15 in the connecting groove 19 rotates in the reverse direction to raise the holding arm 14 of the stirring and humidifying device. S7-4: Start the bottom cover motor 11 of filter barrel 4 and open the bottom cover 9 of filter barrel 4; S7-5: Start the four eccentric motors to vibrate the filter barrel 4; S7-6: After the sample passes through the filter screen 8, the soil particles in the bucket that meet the particle size requirements enter the humidity conditioning bucket 12 through the feed inlet 13. S8: Hold the hand crank 23 and crank the alternation device 20 to rotate the humidity regulating tank 12 above the filter tank 4, so that the humidity regulating tank 12 enters the working position; S9: Humidity Adjustment S9-1: Start the injection pump to add the preset amount of water to the humidification tank 12; S9-2: Start the stirring motor to rotate, which will drive the stirring blade 2 to rotate; S9-3: Return, repeat S9-1, S9-2: until the moisture content of the sample meets the preset test requirements, then proceed to S10; S10: Start the screw motor 15 in the connecting groove 19 to rotate in the reverse direction and raise the holding arm 14 of the stirring and humidifying device; S11: Hold the hand crank 23 and crank the alternation device 20 to rotate the humidity adjustment tank 12 to the bottom of the filter tank 4; S12: Start the motor 11 of the bottom cover of the humidity conditioning tank 12, open the bottom cover 9 of the humidity conditioning tank 12, take out the soil sample, and seal it according to the preset requirements for later use. At this point, the preparation of the soil sample is completed.

[0067] In step S9, after the injection pump starts, it automatically adds a preset amount of water to the humidification tank 12, taking into account the rotation time of the stirring motor and the preset value in step S1.

[0068] In step S12, some experiments require the soil to be sealed in a plastic bag for a period of time after humidification. For these experiments, a plastic bag should be placed inside the humidification bucket 12 beforehand. After the humidification stage is over, the bottom cover does not need to be opened; the plastic bag can be sealed directly and the soil removed for further humidification. For other experiments, the humidification requirements are not particularly high. After the humidification stage is over, the bottom cover of the humidification bucket 12 can be opened, and the soil sample can be used directly for the experiment.

[0069] Finally, it should be noted that the above embodiments of the present utility model are only used to illustrate the technical solution of the present utility model and are not intended to limit it. Although the present utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications or substitutions should be covered within the protection scope of the claims of the present utility model.

Claims

1. A sample preparation device for a soil compaction test, characterized in that, include: A stirring and humidifying device, comprising a stirring mechanism for grinding the sample and a humidifying mechanism for quantitatively adding water; The filter barrel (4) includes a barrel body, a filter screen (8) disposed inside the barrel body near the bottom of the barrel body, and a bottom cover (9) disposed at the bottom of the barrel body and controlled to open or close by a bottom cover motor (11). Humidity regulating tank (12), the humidity regulating tank (12) includes a tank body, a guide port (13) provided on the upper part of the tank body, and a bottom cover provided on the bottom of the tank body that is controlled to open or close by a bottom cover motor; A switching device (20) is provided with a filter barrel holding ring (16) for placing the filter barrel (4) and a humidity regulating barrel holding ring (17) for placing the humidity regulating barrel (12). The filter barrel holding ring (16) is provided with a polarization mechanism. The switching device (20) is used to exchange the positions of the filter barrel (4) and the humidity regulating barrel (12). A frame support (21) is provided to support the switching device (20) and the stirring and humidifying device. The stirring and humidifying device is movably mounted on the frame support (21) via the stirring and humidifying device arm (14). The rotating device (20) is rotatably connected to the frame support (21). The stirring and humidifying device arm (14) cooperates with the rotating device (20) to enable the stirring and humidifying device to work on the filter barrel (4) or the humidifying barrel (12) that has entered the working position.

2. The sample preparation device for geotechnical compaction test according to claim 1, characterized in that: The stirring and humidifying device is set in the packaging box (1), and the packaging box (1) is fixedly connected to the holding arm (14) of the stirring and humidifying device and suspended on the upper part of the frame support (21); The stirring mechanism includes a stirring motor and stirring blades (2). The stirring motor is in the packaging box (1). The stirring motor is provided with an output shaft. A through hole is opened at the center of the bottom wall of the packaging box (1). The output shaft is exposed downward through the through hole. The stirring blades (2) are in multiple sets. The multiple sets of stirring blades (2) are axially evenly distributed and fixed on the stirring blade shaft. The stirring blade shaft is detachably connected to the output shaft of the stirring motor. The humidity control mechanism includes a water filling device (3), which includes an injection pump, a water storage chamber connected to the injection pump, and a water filling control module. The injection pump is provided with a spray nozzle, which is located on the bottom wall of the packaging box (1). The water storage chamber is provided with a water inlet, which is located on the top wall of the packaging box (1). The water filling control module is electrically connected to the injection pump and the stirring motor respectively. The water filling control module is electrically connected to the stirring motor and receives the value of the stirring motor rotation time. The water filling control module is electrically connected to the injection pump and controls the injection pump to spray water.

3. The sample preparation device for geotechnical compaction test according to claim 1, characterized in that: The frame support (21) includes two symmetrically vertically fixed frame brackets. Each frame bracket has a rotating shaft in the middle for rotatably connecting the rotating device (20). One of the frame brackets has a through hole for inserting a hand crank (23) through its rotating shaft.

4. The sample preparation device for geotechnical compaction test according to claim 3, characterized in that: Each of the frame supports has a connecting groove (19) extending downwards from its top surface along its height direction. The connecting groove (19) is used to install the stirring and humidifying device arm (14). A lead screw motor (15) is fixedly installed on the bottom surface of the connecting groove (19). The output shaft of the lead screw motor (15) is vertically arranged and fixedly connected to a lead screw. The stirring and humidifying device arm (14) has threaded holes at both ends. The threaded holes are threadedly connected to the lead screw. When the lead screw motor (15) rotates, it drives the stirring and humidifying device arm (14) and its stirring and humidifying device to move upwards or downwards through the threaded holes and the lead screw.

5. The sample preparation device for geotechnical compaction test according to claim 1, characterized in that: The bottom cover (9) is a circular plate. A bottom cover shaft is vertically installed on the upper surface of the bottom cover (9) near the edge. A first bevel gear is fixedly installed on the bottom cover shaft. The bottom cover motor (11) is installed on the radial side wall of the filter barrel (4) near the lower opening. A second bevel gear is fixedly installed on the output shaft of the bottom cover motor (11). The first bevel gear and the second bevel gear are meshed and connected. When the bottom cover motor (11) rotates, it drives the bottom cover (9) to rotate through the first bevel gear and the second bevel gear, so that the bottom cover (9) opens or closes. The bottom cover motor (11) is fixedly connected to the filter barrel (4) body through the motor fixing block (22).

6. The sample preparation device for geotechnical compaction test according to claim 5, characterized in that: The bottom cover structure of the humidity regulating tank (12) is the same as the bottom cover (9) structure of the filter tank (4).

7. The sample preparation device for geotechnical compaction test according to claim 1, characterized in that: The polarization mechanism consists of multiple sets, which are circumferentially distributed on the axial end face of the filter barrel holding ring (16). Each polarization mechanism includes an eccentric block (5), a polarization motor, and a motor chamber (6). The polarization motor is located in the motor chamber (6), and the eccentric block (5) is fixedly connected to the rotating shaft of the polarization motor. The motor chamber (6) is fixedly located on the axial end face of the filter barrel holding ring (16).

8. The sample preparation device for geotechnical compaction test according to claim 3, characterized in that: The switching device (20) is a frame structure made of pipe material, consisting of two symmetrical side frames. Each side frame has a pipe opening at the top, middle and bottom. The switching device (20) is rotatably connected to the frame support (21) by cooperating with the pivot at the middle of the frame support (21) through the pipe opening at the middle. The hand crank (23) is detachably connected to the bottom wall of one of the central openings of the switching device (20). Both the filter barrel holding ring (16) and the humidity regulating barrel holding ring (17) have rotating shafts extending radially outward on both sides. The filter barrel holding ring (16) is connected to the upper or lower opening of the switching device (20) through its rotating shaft. The filter barrel holding ring (16) is rotatably connected to the switching device (20) through its rotating shaft. The humidity regulating barrel holding ring (17) is connected to the lower or upper opening of the switching device (20) through its rotating shaft.

9. A sample preparation device for a soil compaction test according to claim 8, characterized in that: The feed inlet (13) of the humidity regulating tank (12) has a trumpet-shaped structure.

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