A device for preparing remolded soil and maintaining a specific moisture content

Abstract

The invention discloses a weighing device for preparing remolded soil and maintaining a specific moisture content, comprising a mixing barrel, a watering plate, a water pump, a motor, a motor power output shaft, a stirring blade, a weighing barrel, a soil placing device, a sample box and a weight sensor; a device upper cover is arranged at the top opening of the mixing barrel, the watering plate is connected with the water pump, the watering plate is located in the mixing barrel, the output shaft of the motor is connected with one end of the motor power output shaft, the other end of the motor power output shaft passes through the device upper cover and is inserted into the mixing barrel, and the stirring blade is fixed on the motor power output shaft. The device can effectively solve the problems of uneven moisture content preparation, too long preparation time and inaccurate moisture content caused by water loss during preparation and soil weighing in the existing remolded soil preparation technology.

Description

Technical Field

[0001] The invention relates to a component device, in particular to a component device for preparing remolded soil and maintaining a specific water content. Background Art

[0002] In geotechnical engineering geotechnical tests and scientific research, remolded soil is often used in experiments because of the difficulty of sampling undisturbed soil, large disturbance during transportation, and difficulty in preservation. Soil samples made from remolded soil can be used for direct shear tests, consolidation tests, triaxial tests, dry-wet cycle tests, etc. Soil is a three-phase body composed of water, air, and solid particles. The moisture content index of the soil sample can directly affect the physical and mechanical state of the soil, and thus affect the results of geotechnical experiments. Therefore, preparing soil samples with accurate and uniform moisture content index is an important control point for accurate experimental results.

[0003] The moisture content of soil is the mass of water in the soil and the mass of soil particles, usually expressed as a percentage. In the current "Standard for Geotechnical Test Methods (GB / T 50123-2019)", when preparing a sample with a certain moisture content, the dried soil needs to be spread in a non-absorbent tray, the required amount of water is calculated, and the expected amount of water is sprayed with a sprayer. After standing for a period of time, it is placed in a glass jar and sealed to moisten for a day and night. The standard method is simple and low-cost, and is widely used. However, there are many errors. The thickness of the soil sample is uneven when it is spread, the spraying is uneven when it is sprayed manually with a sprayer, the manual stirring is uneven after standing and there is water loss during stirring, and the evaporation of water due to changes in indoor temperature during standing will affect the change in the moisture content of the final reshaped soil sample. In addition, in the conventional method of preparing soil samples with a specific moisture content, it needs to be left to stand overnight, and the preparation cycle is too long.

[0004] In the process of preparing samples after the moisture content of the remolded soil is prepared, the sample striking method, compaction method and compression method are used. These methods will cause the prepared wet soil to be exposed to the air for a long time, causing changes in the moisture content. For example, CN 104535397, CN107351241, CN 202502007, CN 209423465, etc. only consider how to evenly prepare the moisture content of a specific remolded soil, but do not consider that after the preparation is completed, the wet soil will often be exposed to the air for a long time when weighing the soil, causing the evaporation of water and resulting in changes in the moisture content, which in turn affects the results of geotechnical experiments. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device for preparing remolded soil and maintaining a specific moisture content. The device can effectively solve the problems of uneven moisture content preparation, long preparation time, and inaccurate moisture content caused by water loss during preparation and weighing of soil in the existing remolded soil preparation technology.

[0006] To achieve the above-mentioned purpose, the device for preparing and maintaining a specific moisture content of remolded soil in the present invention comprises a mixing bucket, a watering plate, a water pump, a motor, a motor power output shaft, a mixing blade, a mixing bucket, a soil placing device, a sample box and a weight sensor;

[0007] The top opening of the mixing barrel is provided with a device cover, a water sprinkling plate is connected with a water pump, the water sprinkling plate is located in the mixing barrel, the output shaft of the motor is connected with one end of the motor power output shaft, the other end of the motor power output shaft passes through the device cover and is inserted into the mixing barrel, and the mixing blade is fixed on the motor power output shaft;

[0008] A sampling window is arranged on the side wall of the weighing barrel, the bottom opening of the mixing barrel is opened, the bottom opening of the mixing barrel is located on the top opening of the weighing barrel, and a movable steel plate and a slotted steel plate are arranged between the bottom opening of the mixing barrel and the top opening of the weighing barrel, a movable steel plate handle is arranged on the movable steel plate, a soil releaser is located in the weighing barrel, and the soil releaser is located below the movable steel plate;

[0009] An electromagnetic proportional valve is arranged at the bottom outlet of the soil releaser, and a sample box is located below the soil releaser, and the sample box is located on the weight sensor.

[0010] It also includes a sprinkler plate end shaft and a connecting screw rod. The sprinkler plate end shaft is connected to the device upper cover through the connecting screw rod, and the sprinkler plate is connected to the sprinkler plate end shaft.

[0011] The sprinkler plate is connected to the water pump through a water pipe and a flow controller, and a solenoid valve is arranged on the water pipe.

[0012] A porous partition is arranged between the weight sensor and the sample box.

[0013] A display is arranged on the outer wall of the weight barrel, wherein the display is connected with the weight sensor and the electromagnetic proportional valve.

[0014] A humidity sensor is arranged on the inner wall of the mixing barrel, and a warning light is arranged on the outer wall of the mixing barrel.

[0015] The stirring blade is a spiral rotating blade.

[0016] A sealing gasket is arranged between the side surface of the top of the soil discharger and the inner wall of the component barrel, a cantilever beam is arranged on the side wall of the component barrel, and a rubber pad is arranged between the outer wall of the middle part of the soil discharger and the cantilever beam.

[0017] The upper cover of the device is fixed to the top opening of the mixing barrel by bolts.

[0018] The present invention has the following beneficial effects:

[0019] The device for preparing and maintaining a specific moisture content of remolded soil described in the present invention is a closed environment during specific operation, which effectively prevents the loss of moisture in the soil sample due to changes in indoor ambient temperature and indoor air humidity, thereby preventing the problem of deviation in the moisture content of the prepared soil sample, thereby reducing errors and improving the accuracy of the physical and mechanical indicators of the sample. In addition, during operation, watering and stirring are operated simultaneously to ensure all-round stirring of the remolded soil, which is relatively uniform and shortens the preparation time of the soil sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural design diagram of the present invention;

[0021] Figure 2 is a cross-sectional view of the upper cover 2 of the device;

[0022] Figure 3 for Figure 1 A cross-sectional view along the 1-1 direction;

[0023] Figure 4 It is a structural schematic diagram of the sprinkler plate 4;

[0024] Figure 5 for Figure 1 A cross-sectional view along the 2-2 direction;

[0025] Figure 6 for Figure 1 Schematic diagram of steel plate cross-section structure;

[0026] Figure 7 for Figure 6 Sectional view in the AA direction;

[0027] Figure 8 It is a schematic diagram of the operation of the electromagnetic proportional valve 23;

[0028] Fig. 9 is a flow chart of the operation procedure of the humidity sensor 20 and the warning light 18;

[0029] Fig.10 PLC program flow chart for controlling the weighing process.

[0030] Among them, 1 is a bolt, 2 is a device cover, 3 is a mixing barrel, 4 is a sprinkler plate, 5 is a support frame, 6 is a motor, 7 is a connecting screw, 8 is a connector, 9 is a water pipe, 10 is an anti-slip gasket, 11 is a solenoid valve, 12 is a flow controller, 13 is a water pump, 14 is a pin, 15 is a clip, 16 is a sprinkler plate end shaft, 17 is a motor power output shaft, 18 is a warning light, 19 is a mixing blade, 20 is a humidity sensor, 21 is a slotted steel plate, 22 is a sealing gasket, 23 is an electromagnetic proportional valve, 24 is a data line, 25 is a display, 26 is a sample box, 27 is a porous partition, 28 is a weight sensor, 29 is a sampling handle, 30 is a sampling window, 31 is a soil dispenser, 32 is a sampling window pin, 33 is a rubber pad, 34 is a movable steel plate, 35 is a movable steel plate handle, 36 is a soil inlet, 37 is a pull ring, 38 is a movable steel plate pin, and 39 is a movable groove. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0032] refer to Figures 1 to 10 The component device for preparing remolded soil and maintaining a specific moisture content of the present invention comprises a mixing barrel 3, a watering plate 4, a water pump 13, a motor 6, a motor power output shaft 17, a mixing blade 19, a component barrel, a soil placing device 31, a sample box 26 and a weight sensor 28; a device upper cover 2 is provided at the top opening of the mixing barrel 3, the watering plate 4 is connected to the water pump 13, the watering plate 4 is located in the mixing barrel 3, the output shaft of the motor 6 is connected to one end of the motor power output shaft 17, and the other end of the motor power output shaft 17 passes through the device upper cover 2 and is inserted into the mixing barrel 3. Inside, the stirring blade 19 is fixed on the motor power output shaft 17; a sampling window 30 is arranged on the side wall of the component barrel, the bottom opening of the stirring barrel 3 is located on the top opening of the component barrel, and a movable steel plate 34 and a slotted steel plate 21 are arranged between the bottom opening of the stirring barrel 3 and the top opening of the component barrel, and a movable steel plate handle 35 is arranged on the movable steel plate 34, a soil releaser 31 is located in the component barrel, and the soil releaser 31 is located below the movable steel plate 34; an electromagnetic proportional valve 23 is arranged at the bottom outlet of the soil releaser 31, a sample box 26 is located below the soil releaser 31, and the sample box 26 is located on the weight sensor 28.

[0033] The present invention further comprises a sprinkler plate end shaft 16 and a connecting screw 7 . The sprinkler plate end shaft 16 is connected to the device upper cover 2 via the connecting screw 7 , and the sprinkler plate 4 is connected to the sprinkler plate end shaft 16 .

[0034] The watering plate 4 is connected to a water pump 13 through a water pipe 9 and a flow controller 12 , and a solenoid valve 11 is provided on the water pipe 9 .

[0035] A porous partition 27 is provided between the weight sensor 28 and the sample box 26 .

[0036] A display 25 is disposed on the outer wall of the weight barrel, wherein the display 25 is connected to the weight sensor 28 and the electromagnetic proportional valve 23 .

[0037] A humidity sensor 20 is disposed on the inner wall of the mixing barrel 3 , and a warning light 18 is disposed on the outer wall of the mixing barrel 3 .

[0038] The stirring blade 19 is a spiral rotating blade.

[0039] A sealing gasket 22 is arranged between the side surface of the top of the soil releaser 31 and the inner wall of the component barrel, a cantilever beam is arranged on the side wall of the component barrel, and a rubber pad 33 is arranged between the outer wall of the middle part of the soil releaser 31 and the cantilever beam.

[0040] The upper cover 2 of the device is fixed to the top opening of the mixing barrel 3 by bolts 1 .

[0041] The water pipe 9 is connected to the watering plate 4 through the connector 8, and an anti-skid pad 10 is provided on the upper cover 2 of the device;

[0042] The soil inlet 36 is provided with a cover plate, on which a pull ring 37 is provided. The inner wall of the component barrel is provided with a movable groove 39 , into which the end of the movable steel plate 34 is inserted.

[0043] The mixing barrel 3 is fixed to the motor power output shaft 17 through a pin 14 and a clip 15 ; the movable steel plate 34 is connected to the slotted steel plate 21 through a movable steel plate pin 38 and a movable groove 39 .

[0044] The motor 6 is fixed to the upper cover 2 of the device through the support frame 5; the display 25 is connected to the proportional solenoid valve 11 and the weight sensor 28 through the data line 24; a sampling handle 29 is provided on the sampling window 30; the sampling window 30 is fixed to the side wall of the portion barrel through the sampling window pin 32.

[0045] The specific working process of the present invention is:

[0046] 1) Add remolding soil

[0047] According to the experimental requirements, the remolded soil is dried, crushed and sieved to the required particle size, and the remolded soil with a weight of m1 is added into the mixing barrel 3 through the soil inlet 36 34, and laboratory distilled water is added into the water pump 13.

[0048] 2) Set the water delivery and stirring speed

[0049] Turn on the water pump 13 and the flow controller 12, set the water delivery v as the action control value of the solenoid valve 11, calculate the volume of water by the water delivery through formula (1) and formula (2), set the stirring speed of the motor 6, and place the movable steel plate 34 under the stirring barrel 3 to close the stirring barrel 3.

[0050] w=m2 / m1

[0051] v=m1 / ρ

[0052] Among them, m2 is the mass of water to be added, and m2 is the mass of water to be added;

[0053] 3) Preparation of remolded soil

[0054] Open the solenoid valve 11 to sprinkle water, and run the motor 6 to stir at the same time, so that sprinkling and stirring can be carried out simultaneously. Turn on the humidity sensor 20 and the warning light 18. At this time, the sprinkling has not ended and the difference between the maximum and minimum values ​​measured by the humidity sensor 20 is greater than 0.5%. The warning light 18 lights up in yellow. After the water delivery volume is reached, the solenoid valve 11 automatically closes, and the stirrer is still running. When the difference between the maximum and minimum values ​​measured by the humidity sensor 20 is less than 0.5%, the green warning light 18 lights up, and the stirring can be manually ended. At this time, the moisture content of the remolded soil is prepared.

[0055] 4) The weight of reshaped soil

[0056] Close the electromagnetic proportional valve 23, pull out the movable steel plate 34, and place the prepared wet soil into the soil dispenser 31. According to the mass M required for each portion of remolded soil with a specific moisture content in the required experiment, first remove the weight sensor 28 and clear it to zero, remove the weight of the sample box 26 and the porous partition 27, so that the final value displayed by the weight sensor 28 is the mass of the wet soil. Enter the required wet soil mass into the display 25, and use the mass as the mass value of the electromagnetic proportional valve 23. Open the electromagnetic proportional valve 23, and the wet soil falls into the sample box 26 through the electromagnetic proportional valve 23. When the mass value M>1000g is set, the electromagnetic proportional valve 23 is adjusted to the maximum opening; when 1000g≥M>500g, the electromagnetic proportional valve 23 is adjusted to the middle opening; when M≤500g, the electromagnetic proportional valve 23 is adjusted to a smaller opening. When the weight sensor 28 displays the mass M, the electromagnetic proportional valve 23 is automatically closed, and at this time, there is wet soil of mass M in the sample box 26. The wet soil with a specific moisture content and a specific mass can be used for the experiment. After the sampling window 30 is opened and the sample box 26 is taken out, the sampling window 30 is closed, and the remaining soil is still placed in a closed environment, which can effectively ensure that the moisture content remains unchanged.

Claims

1. A device for preparing remolded soil and maintaining a specific moisture content, characterized in that: It comprises a mixing barrel (3), a watering plate (4), a water pump (13), a motor (6), a motor power output shaft (17), a mixing blade (19), a weighing barrel, a soil placing device (31), a sample box (26) and a weight sensor (28); A device upper cover (2) is provided at the top opening of the mixing barrel (3), a water sprinkling plate (4) is connected to a water pump (13), the water sprinkling plate (4) is located in the mixing barrel (3), an output shaft of the motor (6) is connected to one end of a motor power output shaft (17), the other end of the motor power output shaft (17) passes through the device upper cover (2) and is inserted into the mixing barrel (3), and a mixing blade (19) is fixed on the motor power output shaft (17); A sampling window (30) is provided on the side wall of the weighing barrel, the bottom of the mixing barrel (3) is open, the bottom opening of the mixing barrel (3) is located on the top opening of the weighing barrel, and a movable steel plate (34) and a slotted steel plate (21) are provided between the bottom opening of the mixing barrel (3) and the top opening of the weighing barrel, a movable steel plate handle (35) is provided on the movable steel plate (34), a soil releaser (31) is located in the weighing barrel, and the soil releaser (31) is located below the movable steel plate (34); An electromagnetic proportional valve (23) is arranged at the bottom outlet of the soil releaser (31), a sample box (26) is located below the soil releaser (31), and the sample box (26) is located on a weight sensor (28); A porous partition (27) is provided between the weight sensor (28) and the sample box (26); A display (25) is arranged on the outer wall of the weight barrel, wherein the display (25) is connected to a weight sensor (28) and an electromagnetic proportional valve (23); A sealing gasket (22) is arranged between the side surface of the top of the soil releaser (31) and the inner wall of the component barrel, a cantilever beam is arranged on the side wall of the component barrel, and a rubber pad (33) is arranged between the outer wall of the middle part of the soil releaser (31) and the cantilever beam.

2. The device for preparing remolded soil and maintaining a specific moisture content according to claim 1, characterized in that: It also includes a sprinkler plate end shaft (16) and a connecting screw (7). The sprinkler plate end shaft (16) is connected to the device upper cover (2) via the connecting screw (7), and the sprinkler plate (4) is connected to the sprinkler plate end shaft (16).

3. The device for preparing remolded soil and maintaining a specific moisture content according to claim 1, characterized in that: The watering plate (4) is connected to a water pump (13) through a water pipe (9) and a flow controller (12), and a solenoid valve (11) is provided on the water pipe (9).

4. The device for preparing remolded soil and maintaining a specific moisture content according to claim 1, characterized in that: A humidity sensor (20) is arranged on the inner wall of the mixing barrel (3), and a warning light (18) is arranged on the outer wall of the mixing barrel (3).

5. The device for preparing remolded soil and maintaining a specific moisture content according to claim 1, characterized in that: The stirring blade (19) is a spiral rotating blade.

6. The device for preparing remolded soil and maintaining a specific moisture content according to claim 1, characterized in that: The upper cover (2) of the device is fixed to the top opening of the mixing barrel (3) by means of bolts (1).

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