WO2018086186A1 - 一种随动多点接触式环向应变测量装置 - Google Patents

一种随动多点接触式环向应变测量装置 Download PDF

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WO2018086186A1
WO2018086186A1 PCT/CN2016/109702 CN2016109702W WO2018086186A1 WO 2018086186 A1 WO2018086186 A1 WO 2018086186A1 CN 2016109702 W CN2016109702 W CN 2016109702W WO 2018086186 A1 WO2018086186 A1 WO 2018086186A1
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fixing rod
mounting member
sensor
spring
sample
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PCT/CN2016/109702
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English (en)
French (fr)
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朱其志
史海岭
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河海大学
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid

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  • the invention relates to a follow-up multi-point contact type circumferential strain measuring device, belonging to the technical field of geotechnical engineering.
  • the rock has a wide variety and complex nature, and the experimental study on the mechanical properties of rock started late.
  • indoor test measurements (of type) of rock hoop strain are usually measured using a strain gauge or an improved resistance strain gauge.
  • the existing method can only measure the local strain of the position of the strain gauge, the measurement range is small, and the operation is complicated; other improved resistance strain gauges have low sensitivity, short life, large measurement error, inconvenient operation, and circumferential strain measurement of indoor test. It has become a constraint in the study of rock properties. To this end, a high-precision, large-range toroidal strain gauge is needed to solve such problems.
  • the present invention provides a follow-up multi-point contact type circumferential strain measuring device for cylindrical rock-like or pipeline testing.
  • the present invention provides a follow-up multi-point contact type toroidal strain measuring device comprising a connecting ring, a holder and an LVDT sensor, and a plurality of mounting members are evenly distributed through the side wall of the connecting ring.
  • the mounting member is square and has a circular through hole, and the holder and the LVDT sensor are alternately mounted in the through hole through a connecting member;
  • the holder includes a fixing rod having a telescopic function and is disposed at both ends of the fixing rod An end cap, wherein the end cap that is in contact with the sample installed at the center of the connecting ring is a curved end cap, and the arc is matched with the outer circumference of the sample, and the fixing rod is sleeved with a retainer spring, and The two ends of the retainer spring are respectively fixed on the curved end cap and the mounting member;
  • the probe of the LVDT sensor faces the sample, and the fixing rod of the LVDT sensor is sleeved with a sensor spring, and the two ends of the sensor spring are respectively fixed on the probe base and the mounting member.
  • the connecting ring includes two ring pieces arranged in parallel and side walls integrally formed with the outer edges of the two ring pieces, the mounting member being placed between the two ring pieces through the side wall, A holder and the LVDT sensor are alternately mounted in the through hole of the mounting member.
  • the connecting ring includes three ring pieces arranged in parallel and side walls integrally formed with the edges of the three ring pieces, and the mounting member is placed between the adjacent two ring pieces through the side wall.
  • the holder and the LVDT sensor are alternately mounted in the through hole of the mounting member, and the holder and the LVDT sensor are not in the same horizontal plane.
  • the ring piece is provided with a fan-shaped hollow
  • the side wall is provided with a rectangular hollow
  • the upper and lower sides of the rectangular hollow are equal to the chord length of the outer arc of the fan-shaped hollow curved surface.
  • the connecting member includes a protrusion disposed on the fixing rod and a fixing block disposed at an outer end portion of the mounting member, and the fixing block is provided with a groove matching the protrusion on a side wall of the fixing rod And the length of the groove is smaller than the length of the fixed block.
  • fixture spring has a stiffness coefficient greater than a stiffness coefficient of the sensor spring.
  • the toroidal strain measuring device can measure the circumferential deformation of any interface of a cylindrical (class) rock sample or a cylindrical pipe, eliminating the need for a strain gauge for each test, and having a large range and control range and a simple structure. Long life, accurate data measurement, good stability, and not susceptible to external interference.
  • FIG. 1 is a schematic structural view of a specific embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a second embodiment of the present invention.
  • the present invention provides a follower multi-point contact type toroidal strain measuring device comprising a connecting ring 1, a holder 2 and an LVDT sensor 3, and a plurality of mounting members 104 are evenly distributed through the side wall of the connecting ring 1,
  • the mounting member 104 is square and has a circular through hole, and the holder 2 and the LVDT sensor 3 are alternately mounted in the through hole through the connecting member 104;
  • the holder 2 includes a fixing rod having a telescopic function and an end cap disposed at both ends of the fixing rod, wherein the end cap contacting the sample installed at the center of the connecting ring is an arc end cap 201, and the arc is curved
  • the outer circumference of the sample is matched, and the curved end cap 201 can be any geometric shape as long as the surface contacting the sample is a curved surface, such as a circular shape and a square shape;
  • the fixing rod is sleeved with a retainer spring 202.
  • the two ends of the holder spring 202 are respectively fixed at The curved end cap 201 and the mounting member 104;
  • the probe 301 of the LVDT sensor 3 faces the sample, and the sensor rod 302 is sleeved on the fixing rod of the LVDT sensor 3, and the two ends of the sensor spring 302 are respectively fixed on the probe base and the mounting member 104.
  • the stiffness coefficient of the retainer spring 202 is greater than the stiffness coefficient of the sensor spring 302.
  • the connecting member includes a protrusion 203 disposed on the fixing rod and a fixing block 102 disposed at an outer end of the mounting member 104.
  • the fixing block 102 is disposed adjacent to the side wall of the fixing rod and matched with the protrusion 203.
  • the groove 103, and the length of the groove 103 is smaller than the length of the fixing block.
  • the protrusion is removed from the groove, the fixing rod moves toward the sample, so that the probe contacts the sample; the groove 103 can also be opened at the outer end of the through hole, and when the sample is installed, The fixing rod is pulled outward, so that the protrusion 203 is stuck on the outer wall of the ring. After the sample is installed, the protrusion 203 is caught in the groove 103, so that the probe 301 is in contact with the sample.
  • the connecting ring 1 includes two ring pieces arranged in parallel and side walls integrally formed with the outer edges of the two ring pieces, and the mounting member 104 is placed through the side wall. Between the two ring pieces, the holder 2 and the LVDT sensor 3 are alternately mounted in the through holes of the mounting member as shown in FIG.
  • the connecting ring 1 includes three ring pieces arranged in parallel and side walls integrally formed with the edges of the three ring pieces, and the mounting member 104 is placed through the side wall. Between two adjacent ring pieces, the holder 2 and the LVDT sensor 3 Alternately mounted in the through hole of the mounting member 104, and the holder 2 and the LVDT sensor 3 are not in the same horizontal plane, as shown in FIG.
  • the ring piece of the above two specific embodiments is provided with a fan-shaped hollow 101, the side wall is provided with a rectangular hollow, and the upper and lower sides of the rectangular hollow are long and the fan-shaped hollow curved surface
  • the outer arcs have the same chord length.
  • the invention Compared with the conventional strain ring, the invention has the advantages of large range and control range, simple structure, long service life, accurate measured data and good stability, as shown in Table 1.

Abstract

一种随动多点接触式环向应变测量装置，包括连接环（1）、固定器（2）和LVDT传感器（3），穿过所述连接环的侧壁均匀分布若干个安装件（104），所述安装件为方形，并设有圆形通孔，所述固定器和LVDT传感器通过安装件交替安装在所述通孔内；所述固定器包括具有伸缩功能的固定杆和设置在固定杆两端的端帽，其中，与安装在连接环中心处的试样相接触的端帽为弧形端帽(201)，且弧形与试样的外周相配，所述固定杆上套设有固定器弹簧（202），且所述固定器弹簧的两端分别固定在弧形端帽和安装件上；所述LVDT传感器的探头(301)朝向试样，所述LVDT传感器的固定杆上套设有传感器弹簧（302），且所述传感器弹簧的两端分别固定在探头基座和安装件上。该装置可以测量圆柱形岩石试样或圆柱管道任意界面的环向变形，量程和控制范围大，结构简单，稳定性好，不易受外界干扰。

Description

一种随动多点接触式环向应变测量装置 技术领域
本发明涉及一种随动多点接触式环向应变测量装置，属于岩土工程技术领域。
背景技术
岩石种类繁多，性质复杂，对岩石力学特性的试验研究起步较晚。目前，室内试验测量(类)岩石环向应变的测量通常是使用电阻应变片或改进的电阻应变计。现有的方法只能测量应变片所在位置的局部应变，测量范围小，且操作复杂；其他一些改进的电阻应变计灵敏度低，寿命短，测量误差大，操作不便，室内试验的环向应变测量已经成为岩石特性研究的掣肘，为此，需要有一种高精度、大量程的环向应变测量装置来解决此类问题。
发明内容
本发明为了解决现有技术中存在的上述缺陷和不足，提供了一种针对圆柱状类岩石或管道试验的随动多点接触式环向应变测量装置。
为解决上述技术问题，本发明提供一种随动多点接触式环向应变测量装置，包括连接环、固定器和LVDT传感器，穿过所述连接环的侧壁均匀分布若干个安装件，所述安装件为方形，并设有圆形通孔，所述固定器和LVDT传感器通过连接件交替安装在所述通孔内；
所述固定器包括具有伸缩功能的固定杆和设置在固定杆两端的 端帽，其中，与安装在连接环中心处的试样相接触的端帽为弧形端帽，且弧形与试样的外周相配，所述固定杆上套设有固定器弹簧，且所述固定器弹簧的两端分别固定在弧形端帽和安装件上；
所述LVDT传感器的探头朝向试样，所述LVDT传感器的固定杆上套设有传感器弹簧，且所述传感器弹簧的而两端分别固定在探头基座和安装件上。
进一步，所述连接环包括平行设置的两个环片和与两个环片外边缘处一体成型的侧壁，所述安装件穿过所述侧壁置于两个环片之间，所述固定器和所述LVDT传感器交替安装在所述安装件的通孔内。
进一步，所述连接环包括平行设置的三个环片和与三个环片边缘处一体成型的侧壁，所述安装件穿过所述侧壁置于相邻两个环片之间，所述固定器和所述LVDT传感器交替安装在所述安装件的通孔内，且所述固定器和所述LVDT传感器不在同一水平面内。
进一步，所述环片上设有扇形镂空，所述侧壁上设有长方形镂空，且所述长方形镂空的上下边长与扇形镂空弧形面的外弧线的弦长相等。
进一步，所述连接件包括设置在固定杆上的凸起和设置在安装件外端部的固定块上，所述固定块靠近固定杆的侧壁上设有与所述凸起相配的凹槽，且所述凹槽的长度小于固定块的长度。
进一步，所述固定器弹簧的劲度系数大于所述传感器弹簧的劲度系数。
本发明所达到的有益技术效果：本发明提供的一种随动多点接触 式环向应变测量装置，可以测量圆柱形(类)岩石试样或圆柱管道任意界面的环向变形，省去了每次试验都需要贴应变片的步骤，且量程和控制范围大，结构简单，寿命长，测得的数据精准，稳定性好，且不易受外界干扰。
附图说明
图1本发明具体实施例一结构示意图；
图2本发明具体实施例二结构示意图；
其中：1连接环；2固定器；3传感器；101扇形镂空102固定块；103凹槽；104安装件；201弧形端帽；202固定器弹簧；203凸起；301探头；302传感器弹簧；。
具体实施方式
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。
本发明提供一种随动多点接触式环向应变测量装置，包括连接环1、固定器2和LVDT传感器3，穿过所述连接环1的侧壁均匀分布若干个安装件104，所述安装件104为方形，并设有圆形通孔，所述固定器2和LVDT传感器3通过连接件104交替安装在所述通孔内；
所述固定器2包括具有伸缩功能的固定杆和设置在固定杆两端的端帽，其中，与安装在连接环中心处的试样相接触的端帽为弧形端帽201，且弧形与试样的外周相配，弧形端帽201可以是任何几何形状，只要保证与试样接触的面为弧形面即可，如圆形、方形；所述固定杆上套设有固定器弹簧202，且所述固定器弹簧202的两端分别固定在 弧形端帽201和安装件104上；
所述LVDT传感器3的探头301朝向试样，所述LVDT传感器3的固定杆上套设有传感器弹簧302，且所述传感器弹簧302的而两端分别固定在探头基座和安装件104上。
所述固定器弹簧202的劲度系数大于所述传感器弹簧302的劲度系数。
所述连接件包括设置在固定杆上的凸起203和设置在安装件104外端部的固定块102上，所述固定块102靠近固定杆的侧壁上设有与所述凸起203相配的凹槽103，且所述凹槽103的长度小于固定块的长度，安装试样时，将固定杆向外拉出，凸起203卡在凹槽103内，防止试样放置的过程中对探头产生摩擦，安装完毕后，将凸起从凹槽内移出，固定杆向试样移动，使得探头和试样接触；凹槽103也可以开在通孔的外端部，安装试样时，将固定杆向外拉出，使凸起203卡在圆环的外壁上，试样安装完毕后，将凸起203卡在凹槽103内，使探头301与试样接触。
作为本发明的具体实施例一，所述连接环1包括平行设置的两个环片和与两个环片外边缘处一体成型的侧壁，所述安装件104穿过所述侧壁置于两个环片之间，所述固定器2和所述LVDT传感器3交替安装在所述安装件的通孔内，如图1所示。
作为本发明的具体实施例二，所述连接环1包括平行设置的三个环片和与三个环片边缘处一体成型的侧壁，所述安装件104穿过所述侧壁置于相邻两个环片之间，所述固定器2和所述LVDT传感器3 交替安装在所述安装件104的通孔内，且所述固定器2和所述LVDT传感器3不在同一水平面内，如图2所示。
为了减轻连接环的重量，上述两个具体实施例的所述环片上设有扇形镂空101，所述侧壁上设有长方形镂空，且所述长方形镂空的上下边长与扇形镂空弧形面的外弧线的弦长相等。
与常规应变环相比，本发明具有量程和控制范围大，结构简单，寿命长，测得的数据精准，稳定性好等优点，如表1所示。
表1常规应变环与本发明装置对比
Figure PCTCN2016109702-appb-000001
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变形，这些改进和变形也应视为本发明的保护范围。

Claims (6)

  1. 一种随动多点接触式环向应变测量装置，其特征在于：包括连接环、固定器和LVDT传感器，穿过所述连接环的侧壁均匀分布若干个安装件，所述安装件为方形，并设有圆形通孔，所述固定器和LVDT传感器通过连接件交替安装在所述通孔内；
    所述固定器包括具有伸缩功能的固定杆和设置在固定杆两端的端帽，其中，与安装在连接环中心处的试样相接触的端帽为弧形端帽，且弧形与试样的外周相配，所述固定杆上套设有固定器弹簧，且所述固定器弹簧的两端分别固定在弧形端帽和安装件上；
    所述LVDT传感器的探头朝向试样，所述LVDT传感器的固定杆上套设有传感器弹簧，且所述传感器弹簧的而两端分别固定在探头基座和安装件上。
  2. 根据权利要求1所述的随动多点接触式环向应变测量装置，其特征在于：所述连接环包括平行设置的两个环片和与两个环片外边缘处一体成型的侧壁，所述安装件穿过所述侧壁置于两个环片之间，所述固定器和所述LVDT传感器交替安装在所述安装件的通孔内。
  3. 根据权利要求1所述的随动多点接触式环向应变测量装置，其特征在于：所述连接环包括平行设置的三个环片和与三个环片边缘处一体成型的侧壁，所述安装件穿过所述侧壁置于相邻两个环片之间，所述固定器和所述LVDT传感器交替安装在所述安装件的通孔内，且所述固定器和所述LVDT传感器不在同一水平面内。
  4. 根据权利要求2或3所述的随动多点接触式环向应变测量装置，其特征在于：所述环片上设有扇形镂空，所述侧壁上设有长方形镂空，且所述长方形镂空的上下边长与扇形镂空弧形面的外弧线的弦长相等。
  5. 根据权利要求1所述的随动多点接触式环向应变测量装置，其特征在于：所述连接件包括设置在固定杆上的凸起和设置在安装件外端部的固定块上，所述固定块靠近固定杆的侧壁上设有与所述凸起相配的凹槽，且所述凹槽的长度小于固定块的长度。
  6. 根据权利要求1所述的随动多点接触式环向应变测量装置，其特征在于：所述固定器弹簧的劲度系数大于所述传感器弹簧的劲度系数。
    。
PCT/CN2016/109702 2016-11-14 2016-12-13 一种随动多点接触式环向应变测量装置 WO2018086186A1 (zh)

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