Similar material physical model stress test equipment

Abstract

The utility model discloses a similar material physical model stress test device, which belongs to the technical field of similar simulation stress test experiments, and comprises a resistive film pressure sensor in one-way connection with a sensor interface; the sensor interface is in one-way connection with the data acquisition module through the electronic switch; the data acquisition module is bidirectionally connected with the processor; and the processor is bidirectionally connected with the touch screen and unidirectionally connected with the electronic switch. According to the similar material physical model stress test equipment, surrounding rock stress distribution data can be more accurately and comprehensively acquired in a similar simulation experiment.

Description

Technical Field

[0001] The utility model belongs to the technical field of similar simulation stress test experiments, and in particular relates to similar material physical model stress test equipment. Background Art

[0002] Similar material physical simulation experiments have always been an important method for studying mine pressure and rock control. In the study of similar simulation experiments of coal mining, the changes in surrounding rock stress during the test are usually tested by burying an earth pressure box and connecting a strain tester. This method has disadvantages: the earth pressure box is mainly suitable for strain measurement of flexible sandy soils such as soil, mud, and sand, while in the physical model of similar materials, the rock mass is distributed in layers and shows brittle characteristics after drying. Before the model is excavated, after the earth pressure box membrane is forced to be concave downward, the downward force point of the rock layer is mainly concentrated on the shell of the earth pressure box. Unless the rock layer breaks and further presses down the earth pressure box membrane, the true deformation will not be measured. After the model is excavated, the surrounding rock is deformed and damaged. If the size of the broken block exceeds the diameter of the earth pressure box, the above problems will also occur and the real data cannot be measured. Therefore, when the earth pressure box is used to measure the changes in surrounding rock stress in the physical model of similar materials, the amount of effective data collected is very limited because the earth pressure box membrane and the upper rock mass cannot fully contact, which affects the test effect. Therefore, the utility model proposes a similar material physical model stress testing device. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes a similar material physical model stress testing device to solve the stress testing problem in the similar material physical simulation test process existing in the above prior art.

[0004] To achieve the above-mentioned object, the utility model provides a similar material physical model stress testing device, comprising: a resistive film pressure sensor, the resistive film pressure sensor being unidirectionally connected to a sensor interface;

[0005] The sensor interface is unidirectionally connected to the data acquisition module via an electronic switch;

[0006] The data acquisition module is bidirectionally connected to the processor;

[0007] The processor is bidirectionally connected to the touch screen and unidirectionally connected to the electronic switch.

[0008] Optionally, the processor is also bidirectionally connected to the CPU communication interface, the U disk interface, and the parameter storage module respectively.

[0009] Optionally, the electronic switch is a CD4067 analog switch.

[0010] Optionally, the data acquisition module adopts a 24-bit AD data acquisition device, and the model of the 24-bit AD data acquisition device is AD7190;

[0011] The data acquisition module's acquisition modes include trigger acquisition and timing acquisition.

[0012] Optionally, the processor adopts a 32-bit ARM processor, and the model of the 32-bit ARM processor is STM32F407VET6 168M_CPU.

[0013] Optionally, the model of the parameter storage module is 24C08.

[0014] Optionally, the similar material physical model stress testing device further includes a power supply unit, and the power supply unit includes a lithium battery and a 12V input interface.

[0015] Compared with the prior art, the utility model has the following advantages and technical effects:

[0016] The utility model can simultaneously connect a plurality of thin film pressure sensors in series or in parallel; the utility model can select thin film pressure sensors of different ranges according to the mining depth and similarity ratio to ensure the accuracy of the measured data; the utility model adopts an intelligent touch screen to display the collected stress value in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 This is a structural diagram of a similar material physical model stress testing device according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer device such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0021] Embodiment 1

[0022] The utility model designs a stress testing device for a physical model of similar materials. By adopting a resistive thin film pressure sensor to connect a stress tester designed and developed independently, the stress distribution of the surrounding rock in a similar simulation experiment can be directly measured, accurate and comprehensive stress data can be collected, and initial calibration can be achieved, which is convenient for scientific research.

[0023] like Figure 1 As shown, this embodiment provides a similar material physical model stress testing device, including: a resistive film pressure sensor, a sensor interface, an electronic switch, a data acquisition module, a processor, a touch screen, a CPU communication interface, a U disk interface, a parameter storage module and a power supply unit.

[0024] The power supply unit includes a lithium battery and a 12V input interface.

[0025] The resistive film pressure sensor is unidirectionally connected to the sensor interface, wherein the similar material physical model stress testing device includes a plurality of sensor interfaces.

[0026] The sensor interface is unidirectionally connected to the electronic switch, which is an analog switch of model CD4067.

[0027] The electronic switch is unidirectionally connected to the data acquisition module. The data acquisition module adopts a 24-bit AD data acquisition device. The model of the 24-bit AD data acquisition device is AD7190.

[0028] The data acquisition module is bidirectionally connected to the processor, and the processor adopts a 32-bit ARM processor, and the model of the 32-bit ARM processor is STM32F407VET6 168M_CPU.

[0029] The processor is bidirectionally connected to the touch screen, CPU communication interface, U disk interface, parameter storage module, and unidirectionally connected to the electronic switch. Among them, the model of the touch screen is TJC4827, and the model of the parameter storage module is 24C08.

[0030] The similar material physical model stress testing equipment is composed of two parts: a resistive film pressure sensor and a stress acquisition device.

[0031] The working process is as follows: the resistive film pressure sensor is buried in a physical model of similar materials, and its two ends are connected to the terminals of the stress acquisition system. During the test, the surrounding rock stress is redistributed due to the excavation of the model. When the metal wire in the resistive film pressure sensor is subjected to stress, its resistance will change accordingly with the size of the mechanical deformation. The signal is transmitted to the stress acquisition device, and after being processed by the processor, the stress value and graph are displayed in real time on the intelligent touch screen, and it has a real-time storage function.

[0032] This similar material physical model stress test equipment can collect the data of surrounding rock stress distribution more accurately and comprehensively in similar simulation experiments. Its stress acquisition equipment can realize the following functions: 1. It has 40 measuring points and can connect 20 thin film pressure sensors (series / parallel) at the same time; 2. It can select thin film pressure sensors of different ranges according to the mining depth and similarity ratio to ensure the accuracy of the measured data; 3. It can set the sensor coefficient according to the sensor calibration curve; 4. It can realize removable U disk storage; 5. It uses an intelligent touch screen to display the collected stress value in real time; 6. The collection method includes two types: trigger collection and timed collection.

[0033] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A similar material physical model stress testing device, characterized in that: include: A resistive film pressure sensor, wherein the resistive film pressure sensor is unidirectionally connected to the sensor interface; The sensor interface is unidirectionally connected to the data acquisition module via an electronic switch; The data acquisition module is bidirectionally connected to the processor; The processor is bidirectionally connected to the touch screen and unidirectionally connected to the electronic switch.

2. The similar material physical model stress testing device according to claim 1, characterized in that: The processor is also bidirectionally connected to the CPU communication interface, the U disk interface, and the parameter storage module respectively.

3. The similar material physical model stress testing device according to claim 1, characterized in that: The electronic switch is a CD4067 analog switch.

4. The similar material physical model stress testing device according to claim 1, characterized in that: The data acquisition module adopts a 24-bit AD data acquisition device, and the model of the 24-bit AD data acquisition device is AD7190; The data acquisition module's acquisition modes include trigger acquisition and timing acquisition.

5. The similar material physical model stress testing device according to claim 1, characterized in that: The processor adopts a 32-bit ARM processor, and the model of the 32-bit ARM processor is STM32F407VET6 168M_CPU.

6. The similar material physical model stress testing device according to claim 2, characterized in that: The model of the parameter storage module is 24C08.

7. The similar material physical model stress testing device according to claim 1, characterized in that: The similar material physical model stress testing device also includes a power supply unit, which includes a lithium battery and a 12V input interface.

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