Fully automatic testing device and method for similar materials in geomechanical model tests

Abstract

The present invention belongs to the field of geomechanical model test, and provides a fully automatic test device and method for similar materials in geomechanical model test, including an intelligent multi-stage batching and uniformity detection system capable of realizing multi-stage mixing batching, real-time monitoring of the mixing uniformity inside the batching bin to ensure uniform batching, an adaptive servo pressurization system capable of adaptively adjusting the specimen parameters according to the input sample parameters during the pressing process to meet the sample production requirements, an anti-adhesion multi-specification molding and pressure equalization detection system capable of adapting to the production of samples of various forms and specifications, and real-time detection of whether there are cavity defects inside the specimen during the pressing process, and a detachable automatic drying and water content discreteness verification system capable of flexibly selecting a drying device according to the sample preparation requirements and automatically calculating the water content mean of the batch of samples during the drying process. The present invention can ensure the uniformity of the same group of specimens, improve the efficiency and accuracy of the proportioning test, and can effectively and reasonably evaluate and detect the specimens.

Description

Technical Field

[0001] The invention belongs to the field of geomechanical model tests, and in particular relates to a fully automatic manufacturing and testing device and method for similar materials in geomechanical model tests. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Geomechanical model test is a common method for analyzing engineering problems. It is usually combined with numerical tests and theoretical analysis to explore the mechanism of engineering problems. Similar material ratio test is a key step in geomechanical model test. Its test results are related to the accuracy of test data and the correctness of research conclusions. The similar material ratio test process is cumbersome and meticulous. It requires the production of a large number of specimens with different ratios, and then repeated mechanical tests to finally obtain a material ratio that meets the requirements.

[0004] At present, there are mainly the following problems in the preparation of proportioning specimens:

[0005] 1. Improper specimen preparation and device selection:

[0006] The production of proportioned test pieces requires multiple steps. During the implementation of each step, the selection of the test equipment in that step is rather arbitrary and not standardized, resulting in large errors in the produced test pieces and a low pass rate for the produced test pieces.

[0007] 2. Low efficiency and high cost of specimen production:

[0008] The mix test requires the production of a large number of test specimens. Currently, there are two main methods for producing test specimens: manual compaction and machine compaction. However, these two methods can only produce one test specimen each time, and the success rate is difficult to guarantee. Manual compaction is time-consuming and labor-intensive, and compaction using a uniaxial press is economically expensive. All of these restrict the efficient implementation of the mix test.

[0009] 3. The uniformity of the specimen is difficult to ensure:

[0010] According to the test procedures for the physical and mechanical properties of rocks, the number of specimens for each mix ratio should not be less than 3; using the existing specimen preparation method, the compaction degree and forming effect of the same group of specimens are often affected by multiple factors such as the tester, compaction tools, and the timing of adding materials, which leads to a large discreteness in the test results of the same group of specimens, directly affecting the accuracy of the mix ratio test.

[0011] 4. Testing of finished product specimens is limited:

[0012] After the specimen is manufactured, the size of the specimen is usually inspected by manual measurement with a ruler, which is inconvenient, and the specimen is easily damaged during the measurement process, and the measurement accuracy is low.

[0013] 5. Real-time detection cannot be achieved during sample preparation:

[0014] During the sample preparation process, operations are often carried out according to a fixed process. During the sample preparation process, it is impossible to make real-time adjustments based on actual conditions, and real-time detection during the sample preparation process cannot be achieved.

[0015] The above problems restrict the production efficiency and test results of the proportion specimens, reduce the accuracy of the proportion test, and affect the reliability of the model test. Summary of the invention

[0016] In order to solve the above problems, the present invention proposes a fully automatic preparation and inspection device and method for similar materials in geomechanical model tests. The present invention can ensure the uniformity of the same group of specimens, improve the efficiency and accuracy of the proportion test, and make the specimen preparation process streamlined and standardized. At the same time, the specimens can be effectively and reasonably evaluated and tested; the present invention has the advantages of high production efficiency, good molding effect, small specimen discreteness, convenient operation, standardized production, and streamlined production.

[0017] According to some embodiments, the present invention adopts the following technical solutions:

[0018] A fully automatic preparation and inspection device for similar materials for geomechanical model tests, including an intelligent multi-level batching and uniformity detection system, an adaptive servo pressurization system, an anti-bonding multi-specification molding and pressure equalization detection system, and a detachable automatic drying and moisture content verification system, wherein:

[0019] The intelligent multi-stage batching and uniformity detection system comprises a stirring device, an automatic batching component and a real-time batching uniformity detection component. The stirring device is arranged in the automatic batching component and is used to perform multi-stage stirring on the raw materials in the automatic batching component. The rotating central axis thereof is internally connected with a real-time batching uniformity detection component for monitoring the uniformity of the batching.

[0020] The adaptive servo pressurization system comprises a servo hydraulic loading component, an adaptive control component, a bearing platform and a loading pressure head. The servo hydraulic loading component is connected to the loading pressure head, and the distance between the loading pressure head and the bearing platform for placing the sample is adjustable. The adaptive control component is used to control the pressurization parameters of the servo hydraulic loading component.

[0021] The anti-adhesion multi-specification molding and pressure equalization detection system includes a plurality of replaceable mold assemblies arranged circumferentially below the loading pressure head, each replaceable mold assembly is driven by an independent hydraulic telescopic rod to change the shape of the sample, and a pressure sensor is arranged inside the replaceable mold assembly to detect whether there is a cavity defect inside the test piece;

[0022] The detachable automatic drying and moisture content dispersion calibration system comprises a drying device and a moisture content dispersion calibration component arranged on the side of the carrier platform. The effective area of ​​the drying device and the area where the carrier platform / sample is located at least partially overlap. The moisture content dispersion calibration component includes components for detecting the sample mass and moisture content.

[0023] As an optional embodiment, the automatic batching component includes a raw material bin, a primary mixing bin, a vibrating screen and a fully mixing bin. The raw material bin is located at the top of the automatic batching component, and the lower end is connected to the primary mixing bin via a detachable rotatable chassis. The lower end of the primary mixing bin is connected to the vibrating screen via a detachable rotatable chassis, and the lower end of the vibrating screen is connected to the fully mixing bin via a detachable rotatable screen. The discharge port is located at the bottom of the fully mixing bin.

[0024] As an optional embodiment, the stirring device has at least two groups of combined stirring blades, each group of combined stirring blades is connected to the top motor through a central rotating shaft, and are respectively located in the primary stirring chamber and the sufficient stirring chamber.

[0025] As an optional embodiment, the real-time detection component for uniformity of ingredients includes two sets of dynamic torque sensors and signal transmission lines, which are respectively located at the axis of the combined stirring blades in the primary stirring bin and the axis of the combined stirring blades in the full stirring bin. The uniformity detection inside the stirring bin is achieved by real-time monitoring of the torque at the corresponding combined stirring blades.

[0026] As an optional implementation, the loading head of the adaptive servo pressurizing system is a detachable loading head, the bearing platform is a liftable platform, and the adaptive servo pressurizing system is also equipped with a visual control panel, the detachable loading head is connected to the servo hydraulic loading assembly by fixing bolts, the visual control panel is located on the side of the loading head, the specimen bearing platform is located directly below the detachable loading head, and the adaptive control assembly is located inside the detachable loading head and the specimen bearing platform;

[0027] The detachable loading head can be replaced by a drill bit, on which a sensor is arranged.

[0028] As an optional embodiment, the adaptive control component includes a displacement sensor and a pressure sensor located inside a detachable loading head, and a mass sensor and a signal processing device located inside a specimen carrier. The signal processing device is connected to the above-mentioned sensors to obtain corresponding parameters for adaptively adjusting the specimen pressurization parameters according to preset parameters and obtained parameters during the pressing process.

[0029] As an optional embodiment, the anti-sticking multi-specification molding and equalizing pressure detection system includes four groups of replaceable mold assemblies, a polytetrafluoroethylene cushion layer, four groups of hydraulic telescopic rods and four groups of pressure sensors, wherein the replaceable mold assembly is surrounded by a detachable loading pressure head, and the bottom is close to the support platform, the polytetrafluoroethylene cushion layer is located on the specimen side of the replaceable mold, the hydraulic telescopic rod is located on the outside of the replaceable mold assembly, the two are connected by fixing bolts, and the pressure sensor is located inside the replaceable mold assembly.

[0030] As an optional embodiment, the detachable automatic drying and moisture content verification system includes a detachable dryer, a specimen pushing device, a one-way sealed door, a drying chamber and a moisture content verification component, wherein the specimen pushing device is located on the side of the bottom of the load-bearing platform, two detachable dryers are located on both sides of the load-bearing platform and open toward the drying chamber, the drying chamber is located on the extension line of the specimen pushing device and the load-bearing platform, the middle of the drying chamber is isolated by a one-way sealed door, and the moisture content verification component includes a mass sensor and a moisture content calculation system arranged in the drying chamber.

[0031] The working method of the fully automatic testing device for similar materials based on the above-mentioned geomechanical model test includes the following steps:

[0032] (1) Weigh the materials according to the required proportion and add them to the raw material bin respectively, start the stirring device, let the raw materials fall into the primary stirring bin, and use the combined stirring blade to perform primary stirring on the raw materials; the real-time detection component for uniformity of ingredients detects the torque at the combined stirring blade in real time, and when the torque value is stable, it is considered that the materials are mixed evenly, and the materials fall into the vibrating screen; the mixed materials are screened, and the screened materials fall into the fully stirring bin; the combined stirring blade fully stirs the raw materials, and the real-time detection component for uniformity of ingredients detects the torque at the combined stirring blade in real time, and when the torque value is stable again, it is considered that the materials are mixed evenly;

[0033] (2) Preset the required height, compaction degree, expected quality and holding time for this sample preparation and start the device, and push the four replaceable mold components inward by the hydraulic cylinder to close them into a complete mold;

[0034] (3) Add the mixed raw materials according to the expected input mass, and the quality of the raw materials is detected in real time by the quality sensor inside the carrier; the detachable loading pressure head moves downward and presses the raw materials in the mold according to the set compaction degree;

[0035] (4) The four sets of pressure sensors inside the replaceable mold assembly record the pressure in real time. If the four sets of error values ​​are less than the set values, the sample is considered to be defect-free and the process continues. Otherwise, the sample is considered to be defective and the machine alarm sounds. After the sample is removed, the operation starts again from step (2).

[0036] (5) The loading head holds the pressure of the specimen according to the preset holding time. The displacement sensor inside the detachable loading head records the height of the specimen after holding, automatically calculates the density of the specimen under the current pressure, and calculates the required mass based on the input height. After the holding period is over, the loading head is automatically retracted, and the replaceable mold assembly is synchronously retracted to prevent the specimen from sticking, completing demoulding;

[0037] (6) The load-bearing platform descends, and the specimen descends into the drying chamber. The specimen is pushed into the drying chamber by the specimen pushing device, and the mixed raw materials are added according to the actual required mass obtained by adaptive calculation. The quality of the raw materials is detected in real time by the quality sensor inside the load-bearing platform;

[0038] (7) Repeat steps (3) to (6);

[0039] (8) Turn on the dryer and stop drying until the specified time or when the value of the pressure sensor at the bottom of the drying chamber stops changing. The pressure sensor at the bottom of the drying chamber and the internal mass sensor of the load-bearing platform record the mass of the sample in real time, calculate the water content dispersion, and determine whether the batch of samples is qualified according to the needs;

[0040] (9) The replaceable mold assembly is pushed together by the hydraulic loading device, and the loading head is replaced with an intelligent drill bit. The prepared specimens are selected and placed inside the replaceable mold assembly to start the drilling inspection. The control panel calculates the cohesion, internal friction angle and uniaxial compressive strength through the propulsion speed, drill bit speed, drilling thrust and drilling torque, thus completing the complete inspection process of the batch of specimens.

[0041] As an optional implementation, in the process of automatically calculating the sample density at the current pressure and calculating the required mass based on the input height, the calculation formula is as follows:

[0042] ;

[0043] Where: m 1 is the actual required quality, l 1 is the expected height, m 2 is the theoretical expected quality, l 2 is the current altitude.

[0044] As an optional implementation, the water content dispersion is calculated using the following formula:

[0045] ;

[0046] in, is the water content dispersion, that is, the water content variance, n is the number of specimens, The pressure sensor at the bottom of the drying chamber records the mass, Record the mass for the internal mass sensor of the carrier, is the moisture content calculated using the recorded value of the pressure sensor at the bottom of the drying chamber, is the water content calculated using the values ​​recorded by the mass sensor inside the carrier, is the total mass after dehydration.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] (1) The present invention realizes the automation of the entire sample preparation process of mixing, screening, pressing and drying. The visual control panel controls the hydraulic loading device to realize the entire process of pressurization, pressure maintenance and pressure relief, thereby improving the production efficiency and reducing the discreteness between specimens.

[0049] (2) The present invention can arbitrarily change the size and shape of the test piece according to the production requirements of different samples. By replacing the detachable pressure head and the combined mold, it can meet various sample production requirements.

[0050] (3) The contact area between a single mold component and the test piece in the combined mold of the present invention is small, and the inner surface is coated with polytetrafluoroethylene material, so that the combined mold can be disassembled simultaneously and at a uniform speed, thereby minimizing the damage to the test piece during the demolding process, reducing the friction force on the test piece during the molding process, making demolding easier, and increasing the molding rate.

[0051] (4) The present invention can detect the sample preparation status in real time and automatically adjust it according to the preset preparation indicators. During the production process, the height, quality and compaction of each test piece can be monitored in real time, thereby avoiding the generation of unqualified samples to the greatest extent.

[0052] (5) The present invention can timely detect the mechanical properties of the specimen. By replacing the pressure head, the various mechanical parameters of the prepared specimen can be directly read, and comprehensive detection and evaluation of the specimen can be achieved.

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0055] Figure 1 It is a schematic diagram of a fully automatic device for making similar materials for geomechanics model tests according to one or more embodiments of the present invention;

[0056] Figure 2 is a schematic diagram of an automatic batching assembly according to one or more embodiments of the present invention;

[0057] Figure 3 is a schematic diagram of an automatic drying assembly according to one or more embodiments of the present invention;

[0058] Figure 4 is a schematic diagram of a smart drill according to one or more embodiments of the present invention;

[0059] Figure 5 is a schematic diagram of a replaceable mold assembly according to one or more embodiments of the present invention;

[0060] Among them, 1. stirring device, 2. automatic batching component, 3. detachable loading head, 4. visual control panel, 5. replaceable mold component, 6. specimen lifting platform, 7. detachable dryer, 8. drying chamber;

[0061] 1-1. Connecting base, 1-2. Sensor, 1-3. Drill head assembly;

[0062] 2-1. Raw material bin, 2-2. Primary mixing bin, 2-3. Vibrating screen, 2-4. Fully mixing bin, 2-5. Discharge port;

[0063] 5-1. Polytetrafluoroethylene cushion, 5-2. Fixing bolts;

[0064] 8-1. Specimen pushing device, 8-2. Detachable dryer, 8-3. Specimen lifting platform, 8-4. One-way sealing door, 8-5. Drying chamber. DETAILED DESCRIPTION

[0065] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0066] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0067] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0068] In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0069] Embodiment 1

[0070] An integrated automatic manufacturing device for similar materials in geomechanics model tests, such as Figure 1 As shown, it includes an intelligent multi-stage batching and uniformity detection system, an adaptive servo pressurization system, an anti-adhesive multi-specification molding and equalizing pressure detection system, and a detachable automatic drying and moisture content verification system. The intelligent multi-stage batching and uniformity detection system can realize multi-stage mixing and batching, and can monitor the mixing uniformity inside the batching bin in real time to ensure uniform batching. The adaptive servo pressurization system can adaptively adjust the specimen parameters according to the input sample parameters during the pressing process to meet the sample production requirements. The anti-adhesive multi-specification molding and equalizing pressure detection system can adapt to the production of samples of various shapes and specifications, and can detect in real time whether there are cavity defects inside the specimen during the pressing process. The detachable automatic drying and moisture content dispersion verification system can flexibly select the drying device according to the sample preparation requirements and automatically calculate the moisture content mean of the batch of samples during the drying process.

[0071] Among them, intelligent multi-level batching and uniformity detection system, such as Figure 2 As shown, it includes an automatic batching component 2 and a stirring device 1, and the stirring device 1 has two groups or two stages of combined stirring blades and a motor, specifically including a raw material bin 2-1, a primary stirring bin 2-2, a vibrating screen 2-3, a fully stirring bin 2-4, a combined stirring blade and a real-time detection component for batching uniformity, wherein the raw material bin 2-1 is located at the top of the automatic batching component, and the lower end is connected to the primary stirring bin 2-2 through a detachable rotatable chassis, the lower end of the primary stirring bin 2-2 is connected to the vibrating screen 2-3 through a detachable rotatable chassis, the lower end of the vibrating screen 2-3 is connected to the fully stirring bin 2-4 through a detachable rotatable screen, and the discharge port 2-5 is located at the bottom of the fully stirring bin 2-4, the combined stirring blade is connected to the motor at the top through a central rotating shaft, it is located in the primary stirring bin 2-2 and the fully stirring bin 2-4, and the real-time detection component for batching uniformity is connected inside its rotating central shaft.

[0072] Among them, the real-time detection component of ingredient uniformity includes two sets of dynamic torque sensors and signal transmission lines, which are respectively located at the axis of the combined stirring blades in the primary stirring chamber and the axis of the combined stirring blades in the full stirring chamber. It realizes the uniformity detection inside the stirring chamber by real-time monitoring of the torque at the stirring blades.

[0073] Among them, the adaptive servo pressurizing system includes a servo hydraulic loading component, a detachable loading head 3, an adaptive control component, a visual control panel 4 and a specimen lifting platform 6, wherein the detachable loading head 3 and the servo hydraulic loading component are connected by fixing bolts, the visual control panel 4 is located on the side of the system, the specimen lifting platform 6 is located directly below the detachable loading head 3, and the adaptive control component is located inside the detachable loading head 3 and the specimen lifting platform 6.

[0074] Of course, in other embodiments, the bearing platform for placing the test piece may be stationary, and the detachable loading pressure head 3 may be arranged on a lifting device or a three-dimensional moving mechanism. These may all adopt the existing technology and will not be described in detail here.

[0075] In this embodiment, the adaptive control component includes a displacement sensor and a pressure sensor located inside the detachable loading head 3, and a mass sensor and a signal processing device located inside the specimen lifting platform 6, which can adaptively adjust the specimen parameters according to the input parameters during the pressing process.

[0076] like Figure 4 As shown, the detachable loading pressure head 3 can be replaced by an intelligent drill bit, which includes a connecting base 1-1 and a drill bit assembly 1-3 arranged at the center of the lower end of the connecting base 1-1, and a sensor 1-2 is arranged on the drill bit assembly 1-3 to realize drilling perception.

[0077] Among them, Figure 5 As shown, the anti-sticking multi-specification molding and pressure equalization detection system includes four groups of replaceable mold assemblies 5, a polytetrafluoroethylene cushion layer 5-1, four groups of hydraulic telescopic rods and four groups of pressure sensors, wherein the replaceable mold assembly 5 is surrounded under the detachable loading pressure head, and the bottom is close to the specimen lifting platform, the polytetrafluoroethylene cushion layer 5-1 is located on the specimen side of the replaceable mold, the hydraulic telescopic rod is located on the outside of the replaceable mold assembly 5, and the two are connected by a fixing bolt 5-2, and the pressure sensor is located inside the replaceable mold assembly 5.

[0078] Among them, Figure 3As shown, the detachable automatic drying and moisture content verification system includes a detachable dryer 8-2, a specimen pushing device 8-1, a one-way sealed door 8-4, a drying chamber 8-5 and a moisture content verification component, wherein the specimen pushing device 8-1 is located on the bottom side of the specimen lifting platform 8-3, two detachable dryers 8-2 are located on both sides of the specimen lifting platform 8-3, and are opened toward the drying chamber 8-5, the drying chamber 8-5 is located on the extension line of the specimen pushing device 8-1 and the specimen lifting platform 8-3, and is separated by a one-way sealed door 8-4 in the middle, and the moisture content verification component includes a mass sensor and a moisture content calculation system inside the drying chamber.

[0079] Embodiment 2

[0080] A method for preparing and real-time detecting similar materials for geomechanical model tests, based on the device of embodiment 1, comprises the following steps:

[0081] (1) Adding step: Weigh the materials according to the required proportions and add them to the raw material bin separately.

[0082] (2) Primary stirring step: Start the device and rotate the bottom tray of the raw material bin to allow the raw materials to fall into the primary stirring bin, where the stirring blades perform primary stirring on the raw materials.

[0083] (3) Primary uniformity detection step: The real-time detection component for uniformity of ingredients detects the torque at the stirring blade in real time. When the torque value stabilizes, it is considered that the material is mixed evenly. The bottom tray of the primary mixing bin is rotated out and the material falls into the vibrating screen.

[0084] (4) Vibration screening step: The vibrating screen is connected to the vibrator to screen the mixed material, and the screened material falls into the fully mixed bin.

[0085] (5) Fully stirring step: The raw materials fall into the fully stirring bin and are fully stirred by the stirring blades.

[0086] (6) Secondary uniformity detection step: The real-time detection component for uniformity of ingredients detects the torque at the stirring blade in real time. When the torque value stabilizes again, it is considered that the material is mixed evenly.

[0087] (7) Preset sample preparation parameter steps: Enter the required sample preparation height, compaction degree, expected quality and holding time on the operation panel and start the device.

[0088] (8) Mold assembly: The four replaceable mold components are pushed inward by a hydraulic cylinder to form a complete mold.

[0089] (9) Preset value mass feeding step: The device system adds the mixed raw materials according to the expected input mass, and the quality of the raw materials is detected in real time by the quality sensor inside the lifting platform.

[0090] (10) Sample pressing step: The detachable loading head moves downward and presses the raw material in the mold according to the set compaction degree.

[0091] (11) Sample defect detection steps: The four sets of pressure sensors inside the replaceable mold assembly can record the pressure in real time to avoid uneven pressure caused by internal cavities. If the error values ​​of the four sets are less than or equal to 5%, the sample is considered to be defect-free and the process continues. If the error value is greater than 5%, the sample is considered to be defective and the machine alarm is sounded. After the sample is removed, the operation starts again from step (8).

[0092] (12) Pressure holding step: The loading pressure head maintains the pressure of the specimen according to the preset pressure holding time.

[0093] (13) Adaptive calculation steps: The displacement sensor inside the detachable loading head records the height of the sample after pressure maintenance, automatically calculates the sample density under the current pressure and calculates the required mass based on the input height. The calculation formula is as follows:

[0094] ;

[0095] Where: m 1 is the actual required quality, l 1 is the expected height, m 2 is the theoretical expected quality, l 2 is the current altitude.

[0096] (14) Uniform speed demoulding step: After the pressure holding is completed, the loading pressure head is automatically retracted, and the replaceable mold assembly is synchronously retracted to prevent the sample from sticking, completing the demoulding.

[0097] (15) Sample transfer steps: The specimen lifting platform descends, and the specimen descends into the drying chamber side. The “U”-shaped opening of the specimen pushing device pushes the specimen into the drying chamber through the one-way sealed door.

[0098] (16) Adaptive mass feeding step: The device system adds the mixed raw materials according to the actual required mass obtained by adaptive calculation, and the quality of the raw materials is detected in real time by the quality sensor inside the lifting platform.

[0099] (17) Repeat steps (9) to (16).

[0100] (18) Drying step: The detachable dryer automatically starts and stops drying when the specified time is reached or the value of the pressure sensor at the bottom of the drying chamber no longer changes.

[0101] (19) Dehydration detection steps: The pressure sensor at the bottom of the drying chamber and the mass sensor inside the lifting platform record the mass of the sample in real time, and the moisture content dispersion can be calculated. The calculation formula is as follows:

[0102] ;

[0103] Where: is the water content dispersion (i.e., water content variance), n is the number of specimens, The pressure sensor at the bottom of the drying chamber records the mass, Record the mass for the lift's internal mass sensor, is the moisture content calculated using the recorded value of the pressure sensor at the bottom of the drying chamber, is the moisture content calculated using the values ​​recorded by the mass sensor inside the lift, is the total mass after dehydration.

[0104] The user can decide whether the batch of samples is qualified according to their own needs.

[0105] (20) Downhole testing steps: The replaceable mold assembly is pushed together by the hydraulic loading device, the loading head is replaced with an intelligent drill bit, and the prepared specimen is selected and placed inside the replaceable mold assembly. After the downhole testing begins, the control panel automatically calculates the cohesion, internal friction angle and uniaxial compressive strength based on the quantitative relationship model between downhole parameters and the uniaxial compressive strength of rock (DP-UCS model) through the propulsion speed, drill bit speed, drilling thrust and drilling torque, thus completing the complete testing process of the batch of specimens.

[0106] Of course, in other embodiments, other models may also be used to calculate relevant drilling parameters.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention without creative labor shall be included in the protection scope of the present invention.

Claims

1. A fully automatic testing device for similar materials in geomechanics model tests, characterized in that: It includes intelligent multi-level batching and uniformity detection system, adaptive servo pressurization system, anti-adhesion multi-specification molding and pressure equalization detection system and detachable automatic drying and moisture content verification system, among which: The intelligent multi-stage batching and uniformity detection system comprises a stirring device, an automatic batching component and a real-time batching uniformity detection component. The stirring device is arranged in the automatic batching component and is used to perform multi-stage stirring on the raw materials in the automatic batching component. The rotating central axis thereof is internally connected with a real-time batching uniformity detection component for monitoring the uniformity of the batching. The adaptive servo pressurization system comprises a servo hydraulic loading component, an adaptive control component, a bearing platform and a loading pressure head. The servo hydraulic loading component is connected to the loading pressure head, and the distance between the loading pressure head and the bearing platform for placing the sample is adjustable. The adaptive control component is used to control the pressurization parameters of the servo hydraulic loading component. The anti-adhesion multi-specification molding and pressure equalization detection system includes a plurality of replaceable mold assemblies arranged circumferentially below the loading pressure head, each replaceable mold assembly is driven by an independent hydraulic telescopic rod to change the shape of the sample, and a pressure sensor is arranged inside the replaceable mold assembly to detect whether there is a cavity defect inside the test piece; The detachable automatic drying and water content dispersion verification system comprises a drying device and a water content dispersion verification component arranged on the side of the carrier platform, wherein the action area of ​​the drying device and the area where the carrier platform / sample is located at least partially overlap, and the water content dispersion verification component comprises a component for detecting the mass and water content of the sample; The moisture content dispersion calculation is performed using the following formula: ； in, is the water content dispersion, that is, the water content variance, n is the number of specimens, The pressure sensor at the bottom of the drying chamber records the mass, Record the mass for the internal mass sensor of the carrier, is the moisture content calculated using the recorded value of the pressure sensor at the bottom of the drying chamber, is the water content calculated using the values ​​recorded by the mass sensor inside the carrier, is the total mass after dehydration.

2. A fully automatic testing device for similar materials in geomechanics model tests as claimed in claim 1, characterized in that: The automatic batching component comprises a raw material bin, a primary mixing bin, a vibrating screen and a fully mixing bin. The raw material bin is located at the top of the automatic batching component, and the lower end is connected to the primary mixing bin via a detachable rotatable chassis. The lower end of the primary mixing bin is connected to the vibrating screen via a detachable rotatable chassis. The lower end of the vibrating screen is connected to the fully mixing bin via a detachable rotatable screen. The discharge port is located at the bottom of the fully mixing bin. The stirring device has at least two groups of combined stirring blades, each group of combined stirring blades is connected to the top motor through a central rotating shaft, and is respectively located in the primary stirring chamber and the sufficient stirring chamber.

3. A fully automatic testing device for similar materials in geomechanics model tests as claimed in claim 2, characterized in that: The real-time detection component for uniformity of ingredients includes two sets of dynamic torque sensors and signal transmission lines, which are respectively located at the axis of the combined stirring blades in the primary stirring bin and the axis of the combined stirring blades in the full stirring bin. The uniformity detection inside the stirring bin is achieved by real-time monitoring of the torque at the corresponding combined stirring blades.

4. A fully automatic testing device for similar materials in geomechanics model tests as claimed in claim 1, characterized in that: The loading head of the adaptive servo pressurizing system is a detachable loading head, the bearing platform is a liftable platform, and the adaptive servo pressurizing system is also equipped with a visual control panel, the detachable loading head is connected to the servo hydraulic loading assembly by fixing bolts, the visual control panel is located on the side of the loading head, the specimen bearing platform is located directly below the detachable loading head, and the adaptive control assembly is located inside the detachable loading head and the specimen bearing platform; The detachable loading head can be replaced by a drill bit, on which a sensor is arranged.

5. A fully automatic testing device for similar materials in geomechanics model tests as claimed in claim 4, characterized in that: The adaptive control component includes a displacement sensor and a pressure sensor located inside a detachable loading head, and a mass sensor and a signal processing device located inside a specimen carrier. The signal processing device is connected to the above-mentioned sensors to obtain corresponding parameters for adaptively adjusting the specimen pressurization parameters according to preset parameters and obtained parameters during the pressing process.

6. A fully automatic testing device for similar materials in geomechanics model tests as claimed in claim 1, characterized in that: The anti-sticking multi-specification molding and pressure equalization detection system includes four groups of replaceable mold assemblies, a polytetrafluoroethylene cushion layer, four groups of hydraulic telescopic rods and four groups of pressure sensors, wherein the replaceable mold assembly is surrounded by a detachable loading pressure head, and the bottom is close to the support platform, the polytetrafluoroethylene cushion layer is located on the specimen side of the replaceable mold, the hydraulic telescopic rod is located on the outside of the replaceable mold assembly, the two are connected by fixing bolts, and the pressure sensor is located inside the replaceable mold assembly.

7. The fully automatic testing device for similar materials in geomechanics model test according to claim 1, characterized in that: The detachable automatic drying and moisture content verification system includes a detachable dryer, a specimen pushing device, a one-way sealed door, a drying chamber and a moisture content verification component, wherein the specimen pushing device is located on the side of the bottom of the load-bearing platform, two detachable dryers are located on both sides of the load-bearing platform and open toward the drying chamber, the drying chamber is located on the extension line of the specimen pushing device and the load-bearing platform, the middle of the drying chamber is isolated by a one-way sealed door, and the moisture content verification component includes a mass sensor and a moisture content calculation system arranged in the drying chamber.

8. A working method of the fully automatic testing device for similar materials for geomechanics model tests according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Weigh the materials according to the required proportion and add them to the raw material bin respectively, start the stirring device, let the raw materials fall into the primary stirring bin, and use the combined stirring blade to perform primary stirring on the raw materials; the real-time detection component for uniformity of ingredients detects the torque at the combined stirring blade in real time, and when the torque value is stable, it is considered that the materials are mixed evenly, and the materials fall into the vibrating screen; the mixed materials are screened, and the screened materials fall into the fully stirring bin; the combined stirring blade fully stirs the raw materials, and the real-time detection component for uniformity of ingredients detects the torque at the combined stirring blade in real time, and when the torque value is stable again, it is considered that the materials are mixed evenly; (2) Preset the required height, compaction degree, expected quality and holding time for this sample preparation and start the device, and push the four replaceable mold components inward by the hydraulic cylinder to close them into a complete mold; (3) Add the mixed raw materials according to the expected input mass, and the quality of the raw materials is detected in real time by the quality sensor inside the carrier; the detachable loading pressure head moves downward and presses the raw materials in the mold according to the set compaction degree; (4) The four sets of pressure sensors inside the replaceable mold assembly record the pressure in real time. If the four sets of error values ​​are less than the set values, the sample is considered to be defect-free and the process continues. Otherwise, the sample is considered to be defective and the machine alarm sounds. After the sample is removed, the operation starts again from step (2). (5) The loading head holds the pressure of the specimen according to the preset holding time. The displacement sensor inside the detachable loading head records the height of the specimen after holding, automatically calculates the density of the specimen under the current pressure, and calculates the required mass based on the input height. After the holding period is over, the loading head is automatically retracted, and the replaceable mold assembly is synchronously retracted to prevent the specimen from sticking, completing demoulding; (6) The load-bearing platform descends, and the specimen descends into the drying chamber. The specimen is pushed into the drying chamber by the specimen pushing device, and the mixed raw materials are added according to the actual required mass obtained by adaptive calculation. The quality of the raw materials is detected in real time by the quality sensor inside the load-bearing platform; (7) Repeat steps (3) to (6); (8) Turn on the dryer and stop drying until the specified time or when the value of the pressure sensor at the bottom of the drying chamber stops changing. The pressure sensor at the bottom of the drying chamber and the internal mass sensor of the load-bearing platform record the mass of the sample in real time, calculate the water content dispersion, and determine whether the batch of samples is qualified according to the needs; (9) The replaceable mold assembly is pushed together by the hydraulic loading device, and the loading head is replaced with an intelligent drill bit. The prepared specimens are selected and placed inside the replaceable mold assembly to start the drilling inspection. The control panel calculates the cohesion, internal friction angle and uniaxial compressive strength through the propulsion speed, drill bit speed, drilling thrust and drilling torque, thus completing the complete inspection process of the batch of specimens.

9. The working method according to claim 8, characterized in that: The calculation formula for automatically calculating the sample density at the current pressure and the required mass based on the input height is as follows: ； Where: m 1 is the actual required quality, l 1 is the expected height, m 2 is the theoretical expected quality, l 2 is the current altitude.

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