CN206583717U - A kind of loess vibrates singles haft horizontal stretching/compressing instrument dynamometric system - Google Patents

Abstract

The utility model discloses a loess vibrating uniaxial horizontal tension/compression instrument force measuring system, which comprises an AC power supply, a controller, a data collector, a vibrating table and a horizontal uniaxial tension/compression instrument. The tension/compression instrument includes tension and pressure sensors, the tension and pressure sensors are connected to the data collector, the vibration table and the data collector are all connected to the controller, and the data collector, the controller and the vibration table are all connected to AC power. The system is easy to operate and has high measurement accuracy. It can directly observe the relationship between soil tension or pressure changing with time every second, accurately calculate the change of soil axial displacement under different conditions (dry density, moisture content), and carry out different measurements. The tension/pressure relationship of the soil before and after vibration such as frequency and amplitude, the moisture content of the soil after the vibration test basically does not have any change, and the instrument has no external damage to the soil itself, and can meet the requirements of soil under various conditions. uniaxial tension/compression tests.

Description

A Loess Vibration Uniaxial Horizontal Tensile/Compression Measuring System

technical field

The utility model relates to a test system, in particular to a loess vibration uniaxial horizontal tension/compression instrument force measurement system.

Background technique

Loess landslide fractures are one of the components of landslide landforms. The loess landslide crack is a kind of ground crack; the rock and soil mass on the slope has a tendency to slide due to its own gravity. When it is under the action of natural or human factors, the anti-sliding force is smaller than the sliding force, and the instability of the slope leads to the formation of a landslide. The formation of fissures at the trailing edge of landslides is a harbinger of landslides. In previous studies, there was little research on the relationship between cracks and landslides. However, among the macro factors, geology, precipitation, water diversion tunnels, and surface subsidence are the most important factors for cracks. Causes. The study of the tensile mechanism and failure mechanism of soil will have important research significance for the study of landslides. In the past, the experimental research on the tensile properties of soil could not continuously count its tensile strength. Secondly, there were very few studies on the influence of locomotive vibration on the tensile strength of soil. (compression) instrument. In order to further study the uniaxial tensile strength of soil under vibration.

Utility model content

The utility model provides a loess vibrating uniaxial horizontal tension/compression instrument force measuring system, which has simple structure, convenient operation, high precision and meets test requirements.

A loess vibrating uniaxial horizontal tension/compression instrument force measuring system, including an AC power supply, a controller, a data collector, a vibrating table and a horizontal uniaxial tension/compression instrument, the horizontal uniaxial tension /The compression instrument includes a bottom plate, the bottom of which is provided with a groove, the limit switch is fixed in the groove, the two ends of the bottom plate are respectively fixed with baffles, and one of the baffles is equipped with a pull-press sensor, the tension and pressure sensor is connected to an iron plate through a force transmission steel wire or a force transmission steel rod, the iron plate is fixedly equipped with a soil sample fixing device, and a slide table is arranged above the bottom plate, and the slide A guide rail and a lead screw are interspersed in the platform, and the two ends of the guide rail are connected to the two baffle plates respectively, and the two ends of the lead screw are connected to the two baffle plates respectively, and the guide rail Located in the same horizontal plane as the lead screw, an acrylic long plate is fixed on the slide table, a stepper motor is fixedly installed on one of the baffles, and the lead screw drive is connected to the stepper motor , the vibrating table includes a rubber shock-absorbing pad, and the rubber shock-absorbing pad is sequentially provided with a vibration generating device, a vibration regulating device, and a vibrating table top, and a vibrating box is installed on the vibrating table top, and the pull The pressure sensor is connected with the data collector, and the vibration table and the data collector are all connected with the controller, and the data collector, the controller and the vibration table Both are connected to AC power.

Preferably, the soil sample fixing device, the tension-compression sensor and the force-transmitting steel wire or force-transmitting steel rod are located on the same straight line.

Preferably, limit switches are provided on both sides of the bottom plate.

Preferably, the lead screw has a pitch of 5mm.

Preferably, the radius of the force transmission steel rod is 4mm.

The force measuring system of the utility model has the advantages of simple structure, convenient operation, high measurement accuracy, and meets the test requirements. ) soil axial displacement, changes, and the tension or pressure relationship of the soil before and after different frequencies and amplitudes of vibration. After experiencing vibration, there is no change in the water content of the test soil. External damage can meet the uniaxial tension (or compression) test of soil under various conditions.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural schematic diagram of the loess vibrating uniaxial horizontal tension/compression instrument force measuring system provided by the embodiment of the utility model;

Fig. 2 is the block diagram of the control principle of the loess vibrating uniaxial horizontal tension/compression instrument force measuring system provided by the embodiment of the present invention;

Fig. 3 is the front view of the soil sample fixing device in the force measuring system of the loess vibrating uniaxial horizontal tension/compression instrument provided by the embodiment of the present invention;

Fig. 4 is a top view of the soil sample fixing device in the force measuring system of the loess vibrating uniaxial horizontal tension/compression instrument provided by the embodiment of the utility model.

Explanation of reference signs:

1-baffle plate, 2-tension and pressure sensor, 3-soil sample used in the test, 4-soil sample fixing device, 5-stepper motor, 6-controller, 7-cable, 8-bottom plate, 9-screw, 10-sliding table, 11-acrylic long board, 12-limit switch, 13-vibration table top, 14-iron plate, 15-vibration adjustment device, 16-vibration generating device, 17-rubber shock pad.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figures 1 to 4, a loess vibrating uniaxial horizontal tension/compression instrument force measuring system includes: an AC power supply, a controller, a data collector, a vibration table and a horizontal uniaxial tension/compression instrument; Among them, a cylindrical soil sample with a diameter of 38 mm and a height of 76 mm or a diameter of 50 mm and a height of 76 mm (remodeled or original) was prepared before the test, and it was subjected to vibration tests of different frequencies and amplitudes on a shaking table. Then fix it on a horizontal uniaxial tension instrument or a horizontal uniaxial compression instrument for testing. The tension and compression sensors on the horizontal uniaxial tension instrument or compression instrument are connected to the data collector, the vibration table and the data collector It is connected with the controller, and the AC power supplies power for the data collector, the controller, and the vibrating table; the horizontal extensometer or the horizontal uniaxial compression instrument includes a base plate 8, and a groove is arranged on the bottom of the base plate 8, and a groove is fixed on the groove. A limit switch 12, a baffle plate 1 is fixed at both ends of the bottom plate 8, and a pull-pressure sensor 2 is mounted on the baffle plate 1, and the pull-pressure sensor 2 passes through a force-transmitting steel wire (corresponding to a transmission in a horizontal uniaxial compression instrument). Force steel rod) is connected with iron plate 14, prevents the generation of torsion, and described iron plate 14 is fixedly connected with screw diagonal line with soil sample fixture 4, and the soil sample 3 used for testing is fixed on soil sample fixture with glue 4, the other end of the soil sample fixing device 4 can be placed on the iron plate 14 with grooves during the test, the bottom plate 8 is provided with a slide table 10, and guide rails and lead screws 9 are interspersed in the slide table 10. The guide rail and the leading screw 9 are respectively fixed between the two baffle plates 1, and the guide rail and the leading screw are in the same horizontal plane. The slide table 10 is fixed with an acrylic long board 11 which is convenient for placing the test soil sample. On one baffle plate 1 A stepper motor 5 is fixed, and the screw drive is connected to the stepper motor. The stepper motor 5 can drive the lead screw 9 to move to provide power for the stretching or compression of the pattern soil, that is, to rotate in one direction is to provide stretching power, Rotating in the opposite direction provides compression power. Described vibrating table comprises that the bottom is a rubber damping pad 17, and on the described rubber damping pad is successively a vibration generating device 16, a vibration regulating device 15 and a vibrating table top 13. The vibrating box 14 of the soil sample, the stepping motor 5 is connected to the controller 6 through the cable 7, and the controller 6 (KH-01 stepping motor) can control the amplitude and frequency of the vibrating table, and the uniaxial horizontal extensometer ( or uniaxial horizontal compression instrument) and the motion mode (displacement or pulse) of the stepper motor 5. The system can not only perform uniaxial tension test, but also uniaxial compression test. A rubber damping pad 17 is fixed on the bottom of the vibrating table. The tension and pressure sensor is calibrated before use, and the calibration curve is re-fitted to obtain the fitted calibration curve and the corresponding fitting formula, which is convenient for subsequent data calculation and correction. When carrying out the vibration test, the soil sample 3 is placed in the vibrating box 14 on the vibrating table. In order to prevent the water loss of the soil sample 3 during the vibration test, it can be wrapped with plastic wrap. Limit switches 12 are installed on both sides of the bottom plate 8 . The soil sample fixing device 4, the tension-compression sensor 2 and the force-transmitting steel wire need to be kept on the same line to prevent component forces from being generated during the test and avoid affecting the accuracy of the test results. When carrying out the uniaxial compression test, it is only necessary to replace the force-transmitting steel wire with a force-transmitting steel rod, and the radius of the force-transmitting steel rod is 4mm.

The method of using the system includes the following steps:

1) Installation of uniaxial horizontal extensometer (or uniaxial horizontal compression instrument) and vibration table; including installation of sensors, installation of soil sample fixtures, installation of data collectors, and installation and debugging of controllers;

2) Calibration of sensors: calibrate each tension and pressure sensor to obtain calibration curves of all tension and pressure sensors;

3) Vibration of soil samples: Place the required soil samples on a shaking table to perform vibration tests with different amplitudes and frequencies;

4) Fix the vibrated soil sample on the soil sample fixing device with bonding glue, and then install the soil sample fixing device equipped with the soil sample on the uniaxial tensile instrument (or uniaxial horizontal compression instrument);

5) When conducting the test, turn on the power, start the data collector and controller, and start the tensile test. You can observe the change curve of stress with time on the data collector in real time.

6) Calculation of axial displacement. Using stepper motor pulses

in:

S-axial displacement (mm):

t-time(s):

PPS-pulse speed (Hz)

In summary, the force measuring system is simple in structure, easy to operate, high in measurement accuracy, and meets the test requirements. It can directly observe the relationship between soil tension or pressure changing with time every second, and accurately calculate ) soil axial displacement, changes, and the tension or pressure relationship of the soil before and after different frequencies and amplitudes of vibration. After experiencing vibration, there is no change in the water content of the test soil. External damage can meet the uniaxial tension or compression test of soil under various conditions.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (5)

1. a loess vibrating uniaxial horizontal tension/compression instrument force measuring system is characterized in that it comprises an AC power supply, a controller, a data collector, a vibrating table and a horizontal uniaxial tension/compression instrument, the described The horizontal uniaxial tension/compression instrument includes a bottom plate, the bottom of the bottom plate is provided with a groove, the limit switch is fixed in the groove, the two ends of the bottom plate are respectively fixed with baffles, one of the A tension and pressure sensor is installed on the baffle, and the tension and pressure sensor is connected to an iron plate through a force transmission steel wire or a force transmission steel rod. The iron plate is fixedly equipped with a soil sample fixing device, and a slide platform, the slide table is interspersed with a guide rail and a lead screw, the two ends of the guide rail are connected to the two baffle plates respectively, and the two ends of the lead screw are respectively connected to the two baffle plates plate, the guide rail and the lead screw are located in the same horizontal plane, an acrylic long plate is fixed on the slide table, a stepper motor is fixedly installed on one of the baffles, and the screw drive is connected to For the stepper motor, the vibration table includes a rubber damping pad, and the vibration generating device, the vibration adjustment device, and the table top of the vibration table are sequentially arranged on the rubber shock pad, and the vibration table is installed on the table top of the vibration table. box, the tension and pressure sensor is connected to the data collector, the vibration table and the data collector are connected to the controller, the data collector and the controller and the vibrating table are connected to an AC power source. 2. A kind of loess vibrating uniaxial horizontal tension/compression instrument force measuring system as claimed in claim 1, is characterized in that, described soil sample fixing device, described tension-compression sensor and described force transmission Steel wires or force-transmitting steel rods are located on the same straight line. 3. A loess vibrating uniaxial horizontal tension/compression instrument force measuring system as claimed in claim 1, characterized in that limit switches are arranged on both sides of the bottom plate. 4 . A loess vibrating uniaxial horizontal tension/compression instrument force measuring system as claimed in claim 1 , wherein the pitch of the lead screw is 5 mm. 5. A loess vibrating uniaxial horizontal tension/compression instrument force measuring system as claimed in claim 1, characterized in that the radius of the force transmission steel rod is 4mm.