Loess dry preparation method sample preparation device and method considering environmental factors

Abstract

The invention relates to the field of preparation of soil mechanics samples, in particular to a loess dry preparation method sample preparation device and method considering environmental factors. Comprising a main box, a temperature unit, a humidity unit and a feeding unit, one end of the main box is connected with the humidity unit, the other end of the main box is connected with the temperature unit, and the feeding unit is arranged at the top of the main box; a screening unit is further arranged in the main box, the screening unit comprises a screen, a sleeve and a driving part, an output shaft of the driving part is sleeved with the sleeve, one end of the sleeve is connected with the screen, at least one pair of wall plates is further arranged in the main box, a transverse plate is detachably arranged on the wall plates, and a collecting container is arranged on the transverse plate. By adjusting the vibration amplitude and frequency of the driving part, the soil falling speed can be accurately controlled, so that the carrying process of a soil sample under different wind power conditions is simulated, and sample conditions close to the reality are provided; the humidity unit and the temperature unit can simulate sample preparation under different environment conditions, so that samples meeting requirements are obtained.

Description

Technical Field

[0001] The invention relates to the field of soil mechanics sample preparation, and in particular to a loess dry-processing sample preparation device and method taking environmental factors into consideration. Background Art

[0002] In geotechnical engineering, geological disaster simulation and environmental wind tunnel experiments, the choice of loess sampling method directly affects the authenticity of soil structure and the reliability of experimental conclusions. Current sample preparation methods mainly include wet impact method, dry compaction method and mud method. The wet impact method compacts the soil through layered impact, which can obtain higher dry density and compressive strength, but there are problems such as obvious interlayer structural surface and uneven impact force transmission resulting in discrete density distribution. Secondly, air is easily encapsulated into the sample during the test, resulting in large pores inside the sample, which is not conducive to the subsequent test. The mud method uses static pressure consolidation of super-liquid limit mud. Although it can prepare saturated samples, it is easy to cause water infiltration and concentration, making it difficult to control the dry density and reproduce the natural water content. The dry compaction method achieves uniform density distribution while maintaining the initial moisture content, and completely preserves the original overhead pore structure and particle cementation characteristics of loess. The original pore structure and cementation state directly affect the disaster thresholds of loess such as wetting and liquefaction. The dry compaction method can restore the structural characteristics of the initial loess, thereby more accurately simulating the actual landslide triggering, providing a reliable experimental basis, and is of great value for disaster prevention and mitigation.

[0003] In the existing technology, the mechanical properties of loess are significantly related to its sedimentary environment. The loess formed under different climatic and geological conditions has obvious differences in its structural characteristics and mechanical responses due to differences in soil formation, stress history, and temperature and humidity conditions. However, the existing dry-sedimentation method cannot simulate different sedimentary environmental factors, thus affecting the accuracy of sample preparation. Summary of the Invention

[0004] In response to the problems mentioned in the prior art, the present invention proposes a loess dry-processing sampling device and method that takes environmental factors into consideration to solve the problem that the existing devices do not have the ability to freely adjust the sedimentation environmental factors. At the same time, the device has a simple structure and is easy to use.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a loess drying method sample preparation device taking environmental factors into consideration, comprising a main box, a temperature unit, a humidity unit and a feeding unit. One end of the main box is connected to the humidity unit, and the other end is connected to the temperature unit. The feeding unit is arranged on the top of the main box. A screening unit is also provided inside the main box, and the screening unit includes a screen, a sleeve and a driving member. A sleeve is sleeved on the output shaft of the driving member, and one end of the sleeve is connected to the screen. At least one pair of wall panels is also provided in the main box, and a cross plate is detachably provided on the wall panel, and a collection container is provided on the cross plate.

[0006] As a further improvement of the present invention, the feeding unit is a feeding cylinder, wherein an opening and closing device is provided in the feeding cylinder; The opening and closing device includes an elastic member, a fixed block, a baffle and a rotating shaft. The baffle is arranged in the feed barrel through the rotating shaft and completely covers the cross section of the feed barrel. One end of the baffle is connected to the fixed block through the elastic member.

[0007] As a further improvement of the present invention, the feed cylinder is arranged to align with the screen.

[0008] As a further improvement of the present invention, the temperature unit includes a heating module, a temperature sensor, a controller and an alarm device; The controller is connected to the heating module, the temperature sensor and the alarm device respectively.

[0009] As a further improvement of the present invention, the humidity unit includes a water tank, a humidity sensor, an ultrasonic atomizer and a control device; The control device is connected with the ultrasonic atomizer, the water tank and the humidity sensor respectively.

[0010] As a further improvement of the present invention, the aperture range of the screen is between 0.1 mm and 5 mm.

[0011] As a further improvement of the present invention, there are three pairs of wall panels, and the interval between adjacent wall panels is 40 cm.

[0012] As a further improvement of the present invention, a plurality of circular holes are arranged on the transverse plate.

[0013] As a further improvement of the present invention, the bottom of the main box is further provided with an inverted trapezoidal groove for collecting loose soil.

[0014] A method for preparing a sample using a loess dry method taking environmental factors into consideration, comprising: The horizontal plate is placed on the wall panel inside the main box, and the collection container is installed on the wall panel. The temperature unit and the humidity unit are adjusted until the temperature and humidity required for the experiment are reached and then stopped. The soil sample is added into the main box through the feeding barrel, and the screen is driven by the driving part to prepare the soil sample. The prepared soil will fall into the collection container for collection.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: In order to improve the effect of dry sample preparation, the present invention can accurately control the soil falling rate by adjusting the vibration amplitude and frequency of the driving part, thereby simulating the soil sample transportation process under different wind conditions and providing sample conditions close to reality; through the humidity unit and temperature unit, it can simulate sample preparation under different environmental conditions, so as to obtain samples that meet the requirements.

[0016] When no soil sample is added, the opening and closing device provided in the feeding unit of the present invention is in a state of equilibrium between the elastic part and the baffle, which will cause the feeding barrel to be in a closed state. When the soil sample is added, the gravity of the soil sample will compress the elastic part, and the baffle will rotate with the rotating shaft, so that the soil sample can fall freely. When the soil sample passes through, the elastic part will restore its deformation and push the baffle to close the feeding barrel again. While realizing feeding, it can effectively prevent water vapor and hot air from escaping, ensuring the heat preservation and moisture retention of the device.

[0017] The inverted trapezoidal groove at the bottom of the main box of the present invention enables the sample to slide into the center along the cone surface, which not only achieves efficient dust cleaning, but also has the characteristics of energy saving, environmental protection, and simple recycling; the various components of the present invention are easy to disassemble and replace, which is convenient for daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 Schematic diagram of a screen according to an embodiment of the present invention, a is a top view of the screen, and b is a front view of the screen; Figure 3 Schematic diagram of the opening and closing device of an embodiment of the present invention, a is a schematic diagram when no sample is added, b is a schematic diagram when the sample is added; Figure 4 Schematic diagram of a horizontal plate according to an embodiment of the present invention, a is a top view of the horizontal plate, and b is a front view of the horizontal plate.

[0019] Figure numerals: 1. Feed barrel; 2. Rotating shaft; 3. Baffle; 4. Elastic member; 5. Bolt; 6. Driving member; 7. Sleeve; 8. Temperature unit; 9. Inverted trapezoidal groove; 10. Humidity unit; 11. Horizontal plate; 12. Circular hole; 13. Wall panel; 14. Screen; 15. Main box. DETAILED DESCRIPTION

[0020] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0023] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0025] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0026] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0028] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, the present invention proposes a loess drying method sample preparation device taking environmental factors into consideration, comprising a main box 15, a temperature unit 8, a humidity unit 10 and a feeding unit, wherein one end of the main box 15 is connected to the humidity unit 10, and the other end is connected to the temperature unit 8, and the feeding unit is arranged on the top of the main box 15; a screening unit is further provided inside the main box 15, and the screening unit comprises a screen 14, a sleeve 7 and a driving member 6, a sleeve 7 is sleeved on the output shaft of the driving member 6, and one end of the sleeve 7 is connected to the screen 14, wherein at least one pair of wall panels 13 are further provided inside the main box 15, and a cross plate 11 is detachably provided on the wall panel 13, and a collection container is provided on the cross plate 11.

[0031] In this embodiment, the main box 15 is preferably made of stainless steel as a whole, wherein an openable and closable door is provided in the front of the main box 15. In the embodiment, the door is preferably provided with transparent insulating glass so that the sample preparation process can be observed intuitively; the main box 15 is a closed design as a whole, which can effectively avoid the interference of airflow on sample preparation during indoor operation, and further improve the accuracy and stability of sample preparation.

[0032] The top of the main box 15 is provided with an opening, and a feed tube 1 is provided at the opening, see Figure 1The feed barrel 1 of the embodiment is L-shaped, one end of which extends into the main box 15 and is aligned with the screen 14, specifically 5 cm from the top of the screen 14, which can not only allow the sample to fall freely, but also ensure that the initial velocity of the sample is not too large. The other end is funnel-shaped, which is used for the soil sample to enter the feed barrel 1. The feed barrel 1 of this embodiment is tilted, and the tilt angle is preferably 15°.

[0033] See also Figure 3 When the material is in the liquid state, the material is transported to the storage tank 1 by the lifting of the lifting mechanism 4, and the lifting mechanism 4 is closed.

[0034] The elastic member 4 of the embodiment is preferably a spring, the rotating shaft 2 is a self-lubricating bearing, the baffle 3 can be disassembled and installed through the rotating shaft 2, and a sealing strip is also provided on the contact surface between the bottom of the baffle 3 and the feed barrel 1. The thickness of the sealing strip is 1 mm, which can ensure that the interior of the main box 15 is completely sealed.

[0035] See also Figure 3 A screening unit is provided in the main box 15, and the screening unit includes a screen 14, a sleeve 7 and a driving member 6. In the embodiment, the driving member 6 is preferably a reciprocating motor, and the reciprocating motor can adjust the vibration amplitude and frequency of the screen 14, wherein the vibration amplitude range is between 0 and 50 mm, and the frequency range is between 1 and 80 times / minute. The driving member 6 is adjusted by a control device, and the control device is installed outside the main box 15. The driving member 6 is fixedly installed inside the main box 15 by bolts 5.

[0036] See also Figure 3 In this embodiment, the output end of the driving member 6 is provided with two through holes, and a section of the screen 14 is connected to a sleeve 7, which also has two through holes. The sleeve 7 is a hollow cylindrical structure with a length of 5 cm and a diameter of 1 cm. When the output end of the driving member 6 is extended into the sleeve 7, the through holes on the sleeve 7 are aligned with the through holes on the driving member 6 and fixed by screws to realize the connection between the driving member 6 and the screen 14. One end of the screen 14 is connected with a sleeve 7 of the same size. The sleeve 7 is inserted into the output end of the driving member 6 for connection, which can facilitate the disassembly and replacement of the device to meet the needs of different experiments.

[0037] In the embodiment, the sieve 14 has various apertures, which can be selected according to actual needs, and the aperture range is between 0.1 mm and 5 mm. The sieve 14 is made of stainless steel and is square with a side length of 20 cm.

[0038] See also Figure 1 In this embodiment, three pairs of wall panels 13 are provided inside the main box 15, and each pair of wall panels 13 is respectively installed at the left and right ends of the inner wall of the main box 15, symmetrically and horizontally. The wall panels 13 are preferably made of stainless steel, with specifications of 60 cm in length, 3 cm in width and 1 cm in thickness. The first pair of wall panels 13 arranged from bottom to top are 40 cm away from the bottom of the main box 15, the second pair of wall panels 13 are 80 cm away from the bottom of the main box 15, and the third pair of wall panels 13 are 120 cm away from the bottom of the main box 15. During installation, rust must be thoroughly removed to avoid residual oil and rust affecting the quality of the weld. The wall panels 13 at both ends need to be welded synchronously and symmetrically to avoid deformation of the main box 15 due to uneven heat input. The horizontal plate 11 can be installed on any pair of wall panels 13 according to experimental needs, and the soil samples can be collected through the collection container on the horizontal plate 11.

[0039] See also Figure 4 A horizontal plate 11 is provided on the wall panel 13, and a plurality of circular holes 12 are opened on the horizontal plate 11. The circular holes 12 are of the same size and have the same spacing. In the embodiment, a protrusion is provided in the middle of the horizontal plate 11, and the protrusion is used to position and install the collection container. The width of the horizontal plate 11 is slightly smaller than the width of the main box 15. The circular holes 12 can allow the soil sample to pass through and fall into the inverted trapezoidal groove 9 at the bottom of the main box 15, so that the soil sample will not accumulate on the horizontal plate 11 and cause bending. At the same time, the circular holes 12 can also realize the transmission of heat and water mist, avoiding different local temperatures and humidity inside the main box 15.

[0040] In the embodiment, the temperature unit 8 is arranged on the right side of the main box 15. The temperature unit 8 includes a heating module, a temperature sensor, a controller and an alarm device. The heating module in the embodiment is an electric heating wire and a fan. The heat generated by the electric heating wire is blown into the main box 15 through the air duct by the fan to achieve temperature regulation in the main box 15. The spiral air duct can increase the contact area and time between the hot air and the pipe wall, significantly improving the heat exchange efficiency; the temperature sensor is installed in the main box 15 to accurately measure the actual temperature. A display screen is provided on the surface of the controller. The display screen can display the real-time temperature detected by the temperature sensor. When the temperature exceeds the threshold, the alarm device will be triggered, allowing the staff to adjust the heating module to return the temperature to the threshold range.

[0041] The humidity unit 10 of the embodiment is arranged on the left side of the main box 15. The humidity unit 10 includes a water tank, a humidity sensor, an ultrasonic atomizer and a control device. The water tank is 15L and is connected to the main box 15 through a pipe. An ultrasonic atomizer is provided in the pipe. The water in the water tank is atomized by the ultrasonic atomizer and becomes water vapor which is injected into the main box 15 to adjust the humidity in the main box 15. The humidity is adjusted by the control device and the humidity is checked in real time by the humidity sensor.

[0042] In the embodiment, an inverted trapezoidal groove 9 is provided at the bottom of the main box 15, wherein the middle width of the inverted trapezoidal groove 9 is 8 cm, which is used to prevent the recovery container. The gentle slopes on both sides of the inverted trapezoidal groove 9 can make the soil sample fall freely under gravity, thereby facilitating the recovery of bulk soil.

[0043] When the present invention is used, first place the horizontal plate 11 on any pair of wall panels 13 in the main box 15, and install the collection container on the corresponding protrusion on the horizontal plate 11, and collect the screened soil samples through the collection container; after installation, close the box door, start the temperature unit 8 and the humidity unit 10 to adjust the temperature and humidity in the main box 15 until the temperature and humidity reach the target environmental parameters required for the experiment.

[0044] When the humidity and temperature in the main box 15 reach a constant value, the soil sample is added into the main box 15 through the feeding tube 1, and the soil sample will fall onto the screen 14. The frequency and amplitude required for the experiment are adjusted, and the screen 14 is driven by the driving member 6 to vibrate and screen the soil sample to simulate the soil sample environment under different wind conditions. When the soil sample in the collection container is full, the driving member 6, the humidity unit 10, and the temperature unit 8 are closed, the box door is opened, the collection container is taken out, and the sample preparation is completed.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0046] In addition, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for the purpose of illustrating the technical concept of the present invention and cannot be used to limit the scope of protection of the present invention. Any changes made based on the technical solution in accordance with the technical concept proposed by the present invention fall within the scope of protection of the claims of the present invention.

Claims

1. A loess dry-processing sample preparation device taking environmental factors into consideration, characterized in that: It includes a main box, a temperature unit, a humidity unit and a feeding unit. One end of the main box is connected to the humidity unit, and the other end is connected to the temperature unit. The feeding unit is arranged on the top of the main box. A screening unit is also provided inside the main box, and the screening unit includes a screen, a sleeve and a driving member. A sleeve is sleeved on the output shaft of the driving member, and one end of the sleeve is connected to the screen. At least one pair of wall panels is also provided in the main box, and a cross plate is detachably provided on the wall panel, and a collection container is provided on the cross plate.

2. The loess dry-processing sample preparation device taking environmental factors into consideration according to claim 1, characterized in that: The feeding unit is a feeding cylinder, wherein an opening and closing device is provided in the feeding cylinder; The opening and closing device includes an elastic member, a fixed block, a baffle and a rotating shaft. The baffle is arranged in the feed barrel through the rotating shaft and completely covers the cross section of the feed barrel. One end of the baffle is connected to the fixed block through the elastic member.

3. The loess dry-processing sample preparation device taking environmental factors into consideration according to claim 2, characterized in that: The feed cylinder is aligned with the screen.

4. The loess dry-processing sample preparation device taking environmental factors into consideration according to claim 1, characterized in that: The temperature unit includes a heating module, a temperature sensor, a controller and an alarm device; The controller is connected to the heating module, the temperature sensor and the alarm device respectively.

5. The loess dry-processing sample preparation device taking environmental factors into consideration according to claim 1, characterized in that: The humidity unit includes a water tank, a humidity sensor, an ultrasonic atomizer and a control device; The control device is connected with the ultrasonic atomizer, the water tank and the humidity sensor respectively.

6. The loess dry-processing sample preparation device taking environmental factors into consideration according to claim 1, characterized in that: The aperture range of the sieve is between 0.1 mm and 5 mm.

7. The loess dry-processing sample preparation device taking environmental factors into consideration according to claim 1, characterized in that: There are three pairs of wall panels, and the interval between adjacent wall panels is 40 cm.

8. The loess dry-processing sample preparation device taking environmental factors into consideration according to claim 1, characterized in that: A plurality of circular holes are arranged on the transverse plate.

9. The loess dry-processing sample preparation device taking environmental factors into consideration according to claim 1, characterized in that: The bottom of the main box is also provided with an inverted trapezoidal groove for collecting loose soil.

10. The method for preparing a sample by a loess dry method taking environmental factors into consideration according to any one of claims 1 to 9, characterized in that: include: The horizontal plate is placed on the wall panel inside the main box, and the collection container is installed on the wall panel. The temperature unit and the humidity unit are adjusted until the temperature and humidity required for the experiment are reached and then stopped. The soil sample is added into the main box through the feeding barrel, and the screen is driven by the driving part to prepare the soil sample. The prepared soil will fall into the collection container for collection.

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