CN106969693B - Expansion rate measuring device for test block of expansion filling body - Google Patents
Expansion rate measuring device for test block of expansion filling body Download PDFInfo
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- CN106969693B CN106969693B CN201710186443.8A CN201710186443A CN106969693B CN 106969693 B CN106969693 B CN 106969693B CN 201710186443 A CN201710186443 A CN 201710186443A CN 106969693 B CN106969693 B CN 106969693B
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/002—Active optical surveying means
- G01C15/004—Reference lines, planes or sectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/02—Means for marking measuring points
Abstract
The invention provides a device for measuring the expansion rate of an expansion filling body test block, and belongs to the technical field of mine filling. The device comprises a metal base, a rigid upright post and a clamping arm, wherein a laser ray correction mark, a round/square scale line and a cross scale are engraved on the surface of the base; the metal base is in threaded connection with a rigid upright column vertical to the metal base, and a clamping mark fixed by a clamping arm is marked on the rigid upright column; one end of the clamping arm is fixed on the upright post by a bolt, the other end of the clamping arm is connected with a dial indicator, a laser emitter is arranged in the middle of the clamping arm, and the emitted rays are opposite to the laser ray correction mark; the device is provided with a standard test block for correction before measurement; the main components of the device are fixed by bolts or connected by threads, and disassembly and assembly can be realized. The method can realize the measurement of the expansion rate of the filling body test block meeting the requirement of the test specification, has simple device, flexible application and small test error, and improves the precision, the accuracy and the reliability of the detection of the expansion rate of the filling body test block.
Description
Technical Field
The invention relates to the technical field of mine filling, in particular to a device for measuring the expansion rate of an expansion filling body test block.
Background
The tailing filling goaf is an effective stope supporting mode and a tailing treatment mode, can ensure the underground operation environment, and solves the treatment problems of the occupied area of the tailings, the underground goaf and the surface subsidence. The stability of the filling body is the most critical factor when designing a filling mining method, and researches show that the strength and the deformation behavior (sedimentation shrinkage/expansion) of the filling body are main parameters for determining the structural function of the filling body, so that more results are obtained for the strength research of the filling body at present, but the deformation behavior research of the filling body gradually draws wide attention of scholars, and at present, a reasonable test device and a method are not needed, and a matched test standard is not available. The shortage of the research on the deformation behavior of the filling body prevents engineers from accurately mastering the mechanical behavior of the filling slurry after entering the stope, and directly restricts the advance of filling and mining to a more precise and efficient direction, thereby limiting the utilization level of mineral resources in China. The deformation behavior of the filling body, particularly the expansion behavior, plays an important role in the aspect of filling and playing a structural function, the expansion of the filling body is beneficial to limiting the movement of surrounding rocks, supporting a stope roof and absorbing the stress released by the deformation of rocks, and the high stress environment of a deep stope is effectively improved, so that the size of a mine pillar can be reduced, the resource utilization rate can be improved, the working environment of the stope can be improved, and the labor efficiency can be improved. The expansion behavior can be characterized by the expansion rate, but when the expansion rate is too high, the strength of the filling body is obviously deteriorated, and the inside of the filling body shows a 'crisping' disintegration phenomenon, so that the strength of the filling body is ineffective. Therefore, the expansion behavior of the filler is under intensive study.
Currently, there are two main types of inflatable filling bodies: the filling aggregate contains originally expanding elements (such as sulfide) and the filling material is added with an expanding agent actively. There is currently no uniform evaluation criterion for the expansion properties of an expandable filling body. In the literature, the filler is made into a filler test block with the diameter of 50 multiplied by 100mm or 70.7 multiplied by 70.7mm3, wherein, the measurement of the size of the filler adopts a vernier caliper, the surface of the expanded filler test block is rough and relatively fragile, the surface of the test block can be directly damaged by touching during the measurement of the vernier caliper, the data measured for multiple times are quite discrete, and the axial dimension of the test block is difficult to effectively obtain due to the difference of operation of testers, so that the reliability of the expansion rate test result is poor.
In rock mechanics research, a rock expansion test method and equipment are proposed in standards GB/T50266 and 2013 engineering rock test method standard, DL/T5368 and 2007 Hydraulic and hydroelectric engineering rock test procedure and JTG E41-2005 highway engineering rock test procedure, but in the standards, a test block requiring a free expansion rate test is a cylindrical test block with a diameter of 50-65 mm and a height-diameter ratio of 1 or a cube with a side length of 50-65 mm, the section of the cylinder is required to be parallel to the surface of the cube, but the sample preparation difficulty is high for a filling body test block with a low ash-sand ratio according to the standards; meanwhile, the specification indicates that the test equipment is a free expansion rate tester, rock test blocks are placed in the test equipment for continuous measurement, and the rock test blocks are read for 1 time at fixed time intervals, but the expansion rate of the filling body in the initial period (7d), the medium period (28d) and the long period (90 d) is concerned in the research of the expansion behavior of the filling body, and meanwhile, the filling body test blocks require certain maintenance conditions, and the free expansion rate tester is not suitable for being placed in a maintenance box.
In the research of the mechanical properties of concrete, mortar and cement paste, the test methods of the expansion rates of the concrete, mortar and cement paste test blocks are mentioned in the standards SL 352-2006 hydraulic concrete test procedure, DL/T5355-2006 hydroelectric hydraulic engineering hydraulic test procedure and JC/T313-2009 expansion cement expansion rate test method, but in the standards, the test blocks required for the expansion rate test are a 100mm multiplied by 515mm prism concrete test mould, a 40mm multiplied by 160mm prism mortar test mould and a 25mm multiplied by 280mm prism cement paste test mould, the building material has higher mortar content and higher strength, the prism test blocks prepared by the filling material according to the standards are easy to damage (break), and the material consumption is not favorable for repeated tests. In addition, the test mold with the specification also has the capability of testing the mechanical strength, and the matching performance among test parameters is reduced. Therefore, the test procedures, equipment and methods for researching the expansion behavior of the filling body are directly applied to the performance research of rock and concrete materials, and result deviation is inevitably not caused.
Disclosure of Invention
The invention provides a device for measuring the expansion rate of an expanded filling body test block, which aims to supplement the defects of a test method and equipment in the research of the deformation behavior of a filling body.
The device comprises a metal base, a rigid upright post and a clamping arm, wherein a laser ray correction mark, a round/square scale line and a 'cross' scale with scales are marked on the surface of the metal base; the metal base is in threaded connection with a rigid upright column vertical to the metal base, and a holding mark for holding the arm at a fixed position is marked on the rigid upright column; one end of the clamping arm is fixed on the rigid upright post by a bolt, the other end of the clamping arm is connected with a dial indicator, and a laser emitter is arranged in the middle of the clamping arm; the dial indicator is fixedly connected with the clamping arm through bolts and threads. The main components of the device are fixed by bolts or connected by threads, and can be disassembled and assembled.
The device is equipped with a standard test block for calibration operation of the device at each measurement.
The round/square scale is used for assisting the placement of the test block, and the round/square scale and the cross scale assist the placement of the test block during the test, so that the axis position of the test block is opposite to the measuring head of the dial indicator, and the data measured each time are guaranteed to be the axis length.
And the laser emitter emits rays opposite to the laser ray correction mark, so that the measuring head of the dial indicator is ensured to be over against the center of the cross-shaped scale in the vertical direction.
The fixed position of the clamping arm is determined by the aid of the holding mark, and the requirements of measurement of test blocks with different sizes in a test procedure can be met.
The metal base is made of high-strength materials, and the accuracy of test data cannot be influenced by deformation caused by placement of a heavy test block.
The selection range of the dial indicator specification is 30mm, and the measurement requirement of the test block with large expansion amount can be met.
The laser emitter and the laser ray correction mark ensure that the measuring head of the dial indicator is over against the center of the cross-shaped scale in the vertical direction during assembly, and the error of sight optical correction is avoided.
The standard test block is a cylinder made of a material with a small thermal expansion coefficient, namely three cylinders of phi 50mm multiplied by 70mm, phi 50mm multiplied by 100mm and phi 50mm multiplied by 150mm, and is used for correction operation in each measurement.
This device is through the main disassembling and the equipment that construct of bolt and screw thread realization device, avoids the device to place for a long time and touch the damage in the laboratory by accident, influences measurement accuracy.
The technical scheme of the invention has the following beneficial effects:
the device can detect the size measurement and expansion rate test of the expansion filling body test block meeting the test requirements, is simple, is flexible to apply, effectively simplifies the test method, greatly reduces the test error, improves the measurement precision, reliability and accuracy of the expansion rate of the expansion filling body test block, provides reliable guarantee for more detailed research, design and comprehensive popularization of a filling mining method and improves the utilization rate of mineral resources in China.
Drawings
FIG. 1 is a schematic structural view of an apparatus for measuring the expansion ratio of an expandable filling material test block according to the present invention;
FIG. 2 is a plan view of the expansion ratio measuring apparatus for an expandable filling material block according to the present invention;
FIG. 3 is a schematic structural diagram of a device for detecting the expansion rate of a cylindrical filling block in example 2 of the present invention;
FIG. 4 is a top view of the device of FIG. 3;
fig. 5 is a schematic structural diagram of a cubic filler block expansion ratio detection apparatus in embodiments 3 and 4 of the present invention;
FIG. 6 is a top view of the device of FIG. 5;
FIG. 7 is a schematic diagram illustrating the end face flatness detection of a cylindrical rock or concrete test block in embodiment 5 of the present invention;
fig. 8 is a top view of the device of fig. 7.
Wherein: 1-a metal base; 2-rigid uprights; 3-a clamping arm; 4-a bolt; 5-dial indicator; 6-standard test block; 7-a laser emitter; 8-laser ray correction marking; 9- "Cross" scale; 10-round/square scribed lines; 11-holding a label; 12-test block marking; a 13-phi 75mm multiplied by 150mm cylindrical filling body test block; a 14-70.7mm × 70.7mm × 70.7mm cube filling body test block; a15-phi 50mm x 100mm cylindrical rock test block.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a device for measuring the expansion rate of an expansion filling body test block.
Example 1
As shown in fig. 1 and 2, the device comprises a metal base 1, a rigid upright 2 and a clamping arm 3, wherein the surface of the metal base 1 is marked with a laser ray correction mark 8, a round/square scale line 10 and a graduated 'cross' scale 9; the metal base 1 is in threaded connection with a rigid upright post 2 vertical to the metal base, and the rigid upright post 2 is marked with a holding mark 11 at the fixed position of a holding arm 3; one end of the clamping arm 3 is fixed on the rigid upright post 2 by a bolt 4, the other end is connected with a dial indicator 5, and a laser emitter 7 is arranged in the middle of the clamping arm 3; the dial indicator 5 is fixedly connected with the clamping arm 3 through a bolt 4 by screw threads. The device is equipped with a standard block 6 for calibration operation of the device at each measurement. The main components of the device are fixed by bolts or connected by threads, and disassembly and assembly can be realized.
The expansion ratio detection step comprises device assembly, dimension measurement and expansion ratio calculation. The device is assembled and corrected, the metal base 1, the rigid upright post 2, the clamping arm 3 and the dial indicator 5 are connected, the axis of the measuring rod of the dial indicator penetrates through the center of a cross-shaped scale 9 of the base by using a laser emitter 7 and a laser ray correction mark 8, and then all the connecting parts are fixed. And finally, placing the corresponding correcting test block on the base, and zeroing the dial indicator.
The dimension measuring step is the axial length of the test block, and the cylindrical test block measures the height of the cylindrical axial center: hd. The expansion ratio calculation step means that the initial dimension H is definedoAnd then measuring the size H of the test block at the designed age according to the research purposedBy passingThe expansion ratio was calculated.
The laser emitter and the laser correction mark are used for correcting the device, and the metal base 1, the rigid upright post 2, the clamping arm 3 and the dial indicator 5 are connected. And (3) opening the laser emitter 7 to project rays to the laser ray correction mark 8, and simultaneously enabling the axis of the measuring rod of the dial indicator to penetrate through the center of a cross ruler 9 of the base, and fixing all the joints.
The embodiment is the most basic implementation mode, and the centre gripping arm is furnished with laser emitter on, and stand axis, laser emitter axis and dial indicator measuring rod axis lie and are used for the plane, and are parallel to each other. The laser emitter's ray is fixed with each junction after projecting to correct the mark, and the setting of correcting the ray can guarantee that test device all is effectual at every turn. The method for testing the expansion rate of the test block of the expansion filling body is simple and feasible, and practice proves that the data of the axial length of the test block is concentrated in a single repeated test, and the expansion rate of the test block of the expansion filling body is high in precision and reliability.
Example 2
A detection device for the expansion rate of a test block of an expansion filling body comprises a metal base 1, a rigid upright post 2 and a clamping arm 3, wherein a laser ray correction mark 8 is carved on the surface of the metal base 1, a round/square scale 10 for assisting the test block to be placed and a 'cross' scale 9 with scales ensure that the axis of the test block passes through the center of the base during each measurement, so that the measured data is the size of the axis of the test block; the metal base 1 is in threaded connection with a rigid upright post 2 vertical to the metal base, and the rigid upright post 2 is marked with a holding mark 11 at a holding arm fixing position; one end of the clamping arm 3 is fixed on the rigid upright post 2 by a bolt 4, and the other end is connected with a wide-range (30mm) dial indicator 5, so that the measurement of the test block with large expansion amount is realized; a laser emitter 7 is arranged in the middle of the clamping arm 3, and emitted rays are opposite to a laser ray correction mark 8, so that the measuring head of the dial indicator 5 is ensured to be right opposite to the center of a cross-shaped scale 9 of the base in the vertical direction; the device is provided with a standard test block 6 for correction operation at each measurement; the main components of the device are fixed by bolts or connected by threads, and disassembly and assembly can be realized.
The expansion ratio detection step comprises device assembly, dimension measurement and expansion ratio calculation. The device is assembled and corrected by arranging a metal base 1 and a rigid upright post 2The clamping arm 3 is connected with the dial indicator 5, the axis of the measuring rod of the dial indicator 5 passes through the center of a cross-shaped scale 9 of the base by using a laser emitter 7 and a laser ray correction mark 8, and then all the connecting parts are fixed. And finally, placing the corresponding correcting test block on the base, and zeroing the dial indicator. The dimension measuring step is the axial length of the test block, and the cylindrical test block measures the height of the cylindrical axial center: hd. The expansion ratio calculation step means that the initial dimension H is definedoAnd then measuring the size H of the test block at the designed age according to the research purposedBy passingThe expansion ratio was calculated.
The laser emitter and the laser correction mark are used for correcting the device in the measuring step, and the metal base 1, the rigid upright post 2, the clamping arm 3 and the dial indicator 5 are connected. When the laser emitter 7 is turned on, rays are projected to the laser ray correction mark 8, and meanwhile, the axis of the measuring rod of the dial indicator penetrates through the center of the cross-shaped scale of the base, and meanwhile, all connecting parts are fixed.
The standard test block is a cylinder with a low thermal expansion coefficient of phi 50mm multiplied by 150mm, and is used for correction operation in each measurement to ensure the effectiveness of the device.
As shown in fig. 3 and 4, in the present embodiment, a cylindrical packing block 13 with a diameter of 75mm × 150mm is used, and a block mark 12 is provided on the metal base 1.
This embodiment is the most basic embodiment, and the assembled device uses standard test blocks to perform calibration operation to ensure the validity of the inspection, and the device is equipped with three standard test blocks to adapt to the detection of the expansion rate of the expansion filling body test blocks with various specifications. The method for testing the expansion rate of the test block of the expansion filling body is simple and feasible, and practice proves that the data of the axial length of the test block is concentrated in a single repeated test, and the expansion rate of the test block of the expansion filling body is high in precision and reliability.
Example 3
Referring to fig. 5 and 6, the device for detecting the expansion rate of the test block of the expansion filling body comprises a metal base 1, a rigid upright post 2 and a clamping arm 3, wherein a laser ray correction mark 8 is marked on the surface of the metal base, a round/square scale 10 for assisting the test block to be placed and a 'cross' scale 9 with scales ensure that the axis of the test block passes through the center of the base during each measurement, so that the measured data is the size of the axis of the test block; the metal base is in threaded connection with a rigid upright column vertical to the metal base, and a clamping arm fixing position clamping mark 11 is marked on the rigid upright column; one end of the clamping arm is fixed on the upright post by a bolt 4, and the other end of the clamping arm is connected with a large-range (30mm) dial indicator, so that the measurement of the large-expansion test block is realized; a laser emitter 7 is arranged in the middle of the clamping arm, and the emitted rays are opposite to a laser ray correction mark 8, so that the measuring head of the dial indicator is ensured to be right opposite to the center of the cross-shaped scale of the base in the vertical direction; the device is provided with a standard test block 6 for correction operation at each measurement; the main components of the device are fixed by bolts or connected by threads, and disassembly and assembly can be realized.
The expansion ratio detection step comprises device assembly, dimension measurement and expansion ratio calculation. The device is assembled and corrected, the base 1, the upright post 2, the clamping arm 3 and the dial indicator 5 are connected, the axis of the measuring rod of the dial indicator penetrates through the center of a cross-shaped scale of the base by using the laser emitter 7 and the laser ray correction mark 8, and then all the connecting parts are fixed. And finally, placing the corresponding correcting test block on the base, and zeroing the dial indicator. The size measuring step is to place the cube test block 14 marked with the letter mark 12 on the base 1, the axial length of the test block and the cylindrical test block measure the height of the cylindrical axial center: hd. The expansion ratio calculation step means that the initial dimension H is definedoAnd then measuring the size H of the test block at the designed age according to the research purposedBy passing
The expansion ratio was calculated.
The laser emitter and the laser correction mark are used for correcting the device in the measuring step, and the metal base 1, the rigid upright post 2, the clamping arm 3 and the dial indicator 5 are connected. When the laser emitter is turned on, rays are projected to the laser ray correction mark 8, and meanwhile, the axis of the measuring rod of the dial indicator penetrates through the center of the cross-shaped scale of the base, and meanwhile, all connecting parts are fixed.
The standard test block is a cylinder with a low thermal expansion coefficient of phi 50mm multiplied by 150mm, and is used for correction operation in each measurement to ensure the effectiveness of the device.
When the clamping arm is fixed, the clamping arm fixing mark 11 is carved on the upright column, so that the clamping arm fixing height can be adjusted conveniently and simply when test blocks with different sizes are measured.
In order to improve the applicability of the device to the measurement of the expansion rate of test blocks with different specifications, clamping arm fixing marks are engraved on the upright column, and the clamping arm has a certain fixing position for detecting the expansion rate of a test block with a certain specification. Practice proves that the expansion rate of the test block of the expansion filling body is high in precision and reliability by concentrating the axial length data of the test block in a single repeated test.
Example 4
Referring to fig. 5 and 6, the device for detecting the expansion rate of the test block of the expansion filling body comprises a metal base 1, a rigid upright post 2 and a clamping arm 3, wherein a laser ray correction mark 8 is marked on the surface of the metal base, a round/square scale 10 for assisting the test block to be placed and a 'cross' scale 9 with scales ensure that the axis of the test block passes through the center of the base during each measurement, so that the measured data is the size of the axis of the test block; the metal base is in threaded connection with a rigid upright column vertical to the metal base, and a clamping arm fixing position clamping mark 11 is marked on the rigid upright column; one end of the clamping arm is fixed on the upright post by a bolt 4, and the other end of the clamping arm is connected with a large-range (30mm) dial indicator, so that the measurement of the large-expansion test block is realized; a laser emitter 7 is arranged in the middle of the clamping arm, and the emitted rays are opposite to a laser ray correction mark 8, so that the measuring head of the dial indicator is ensured to be right opposite to the center of the cross-shaped scale of the base in the vertical direction; the device is provided with a standard test block 6 for correction operation at each measurement; the main components of the device are fixed by bolts or connected by threads, and disassembly and assembly can be realized.
The expansion ratio detection step comprises device assembly, dimension measurement and expansion ratio calculation. The device is assembled and corrected, and the metal base 1, the rigid upright post 2, the clamping arm 3 and the dial indicator 5 are connectedAnd the axis of the measuring rod of the dial indicator penetrates through the center of the cross-shaped scale of the base by using a laser emitter 7 and a laser ray correction mark 8, and then all the connecting parts are fixed. And finally, placing the corresponding correcting test block on the base, and zeroing the dial indicator. The dimension measuring step is the axial length of the test block, and the cubic test block respectively measures the axial lengths of three surfaces, namely a front surface A, a top surface B and a side surface C: hA，d，HB，d，HB，dThen according to the formula
And calculating the length of the axis of the cube. The expansion ratio calculation step means that the initial dimension H is definedoAnd then measuring the size H of the test block at the designed age according to the research purposedBy passing
The expansion ratio was calculated.
The laser emitter and the laser correction mark are used for correcting the device in the measuring step, and the metal base 1, the rigid upright post 2, the clamping arm 3 and the dial indicator 5 are connected. And (3) opening the laser emitter to project rays to the laser ray correction mark 8, and simultaneously enabling the axis of the measuring rod of the dial indicator to penetrate through the center of the cross-shaped scale of the base and fixing all the joints.
The standard test block is a cylinder with a low thermal expansion coefficient of phi 50mm multiplied by 150mm, and is used for correction operation in each measurement to ensure the effectiveness of the device.
When the clamping arm is fixed, the rigid upright post is carved with a clamping arm fixing mark 11, so that the clamping arm fixing height can be adjusted conveniently and simply when test blocks with different sizes are measured.
The auxiliary round/square reticle 10 and the cross scale 9 mean that a cylindrical test block 14 with phi 75mm multiplied by 150mm is placed on the base 1 in the measuring step, and the auxiliary round/square reticle 10 and the cross scale 9 are utilized to ensure that the axis of the test block is directly opposite to the measuring head of the dial indicator 5.
The embodiment is an optimal implementation mode, and when the auxiliary round/square scribed line and the cross-shaped ruler on the base are used for measurement, the test block is placed more accurately, so that the measured data are the sizes of the axes of the test block, and the reliability of the data and the convenience and easiness of the test are improved. The method for testing the expansion rate of the sulfur-containing filling body test block is simple and feasible, and practice proves that the expansion rate of the sulfur-containing filling body test block is high in precision and reliability due to the fact that the axial length data of the test block is concentrated in a single repeated test.
Example 5
Referring to fig. 7 and 8, the device for detecting the expansion rate of the test block of the expansion filling body comprises a metal base 1, a rigid upright post 2 and a clamping arm 3, wherein a laser ray correction mark 8 is marked on the surface of the metal base, a round/square scale 10 for assisting the test block to be placed and a 'cross' scale 9 with scales ensure that the axis of the test block passes through the center of the base during each measurement, so that the measured data is the size of the axis of the test block; the metal base is in threaded connection with a rigid upright column vertical to the metal base, and a clamping arm fixing position clamping mark 11 is marked on the rigid upright column; one end of the clamping arm is fixed on the upright post by a bolt 4, and the other end of the clamping arm is connected with a large-range (30mm) dial indicator, so that the measurement of the large-expansion test block is realized; a laser emitter 7 is arranged in the middle of the clamping arm, and the emitted rays are opposite to a laser ray correction mark 8, so that the measuring head of the dial indicator is ensured to be right opposite to the center of the cross-shaped scale of the base in the vertical direction; the device is provided with a standard test block 6 for correction operation at each measurement; the main components of the device are fixed by bolts or connected by threads, and disassembly and assembly can be realized.
The laser emitter and the laser correction mark are used for correcting the device in the measuring step, and the metal base 1, the rigid upright post 2, the clamping arm 3 and the dial indicator 5 are connected. And (3) opening the laser emitter to project rays to the laser ray correction mark 8, and simultaneously enabling the axis of the measuring rod of the dial indicator to penetrate through the center of the cross-shaped scale of the base and fixing all the joints.
The standard test block is a phi 50mm multiplied by 100mm cylinder with low thermal expansion coefficient, and is used for correction operation in each measurement, so that the effectiveness of the device is ensured.
When the clamping arm is fixed, the clamping arm fixing marks 11 are carved on the upright posts, so that the clamping arm fixing height can be adjusted conveniently and simply when test blocks with different sizes are measured.
In the inspection step, a cylindrical rock test block 15 with the diameter of 50mm multiplied by 100mm is placed on the metal base 1 and moves from one end to the other end along a cross scale 9, and the axial size is recorded once when the test block moves by one scale; and after the direction of one scale is finished, the other vertical scale is changed, and the scale is measured once every time. And after one end is detected, carrying out next end face detection according to the same method.
This embodiment is a popularization and application of the device, utilizes the expansion ratio detection device to detect rock, concrete test block terminal surface roughness. The accuracy of the test block is required to be tested before the mechanical strength test is carried out on the rock and concrete test block, and the non-parallelism of the two opposite end faces of the cylindrical test block is not more than 0.05 mm. Installing the device for detecting the expansion rate of the expansive filling body test block, placing the processed rock test block on a base of the device, moving the test block along two orthogonal directions, and continuously measuring the axial length on the surface of the test block. The device is provided with a dial indicator, and the precision of the device is 0.01mm, so that the precision of the device meets the test requirement of a test block. Practice proves that the device replaces a vernier caliper to test the parallelism of the section of the test block, is simple to operate, flexible to apply, convenient and fast, and reliable in result, and provides an effective test auxiliary device for indoor tests.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. An expansion rate measuring device for an expandable filling material test block is characterized in that: the device comprises a metal base (1), a rigid upright post (2) and a clamping arm (3), wherein a laser ray correction mark (8), a round/square scale (10) and a 'cross' scale (9) with scales are marked on the surface of the metal base (1); a rigid upright post (2) which is vertical to the metal base (1) is connected with the metal base through threads, and a holding mark (11) for fixing the clamping arm (3) is marked on the rigid upright post (2); one end of the clamping arm (3) is fixed on the rigid upright post (2) through a bolt (4), the other end of the clamping arm is connected with a dial indicator (5), and a laser emitter (7) is arranged in the middle of the clamping arm (3); the dial indicator (5) is fixedly connected with the clamping arm (3) through a bolt (4) in a threaded manner;
the device is provided with a standard test block (6) for calibration operation of the device at each measurement;
the laser emitter (7) emits rays opposite to the laser ray correction mark (8) to ensure that the measuring head of the dial indicator (5) is right opposite to the center of the cross scale (9) in the vertical direction;
the laser emitter (7) and the laser ray correction mark (8) ensure that the measuring head of the dial indicator (5) is right opposite to the center of the cross-shaped scale (9) in the vertical direction during assembly;
the standard test block (6) is a cylinder which is made of a material with a small thermal expansion coefficient and has three cylinder sizes of phi 50mm multiplied by 70mm, phi 50mm multiplied by 100mm and phi 50mm multiplied by 150mm, and is used for correction operation in each measurement;
the round/square scale line (10) is used for assisting the placement of the test block, so that the axis position of the test block is opposite to the measuring head of the dial indicator, and the data measured each time are guaranteed to be the axis length;
the metal base (1) is made of high-strength material;
the selection range of the dial indicator (5) specification is 30 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710186443.8A CN106969693B (en) | 2017-03-24 | 2017-03-24 | Expansion rate measuring device for test block of expansion filling body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710186443.8A CN106969693B (en) | 2017-03-24 | 2017-03-24 | Expansion rate measuring device for test block of expansion filling body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106969693A CN106969693A (en) | 2017-07-21 |
| CN106969693B true CN106969693B (en) | 2020-02-07 |
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| CN109696106A (en) * | 2019-03-12 | 2019-04-30 | 岳阳大陆激光技术有限公司 | A kind of fan blade measuring device, method and the application in blade reparation |
| CN111551100A (en) * | 2020-06-16 | 2020-08-18 | 昆山合力泰汽车检具有限公司 | Left rear side wall triangular window assembly checking fixture |
| CN114354375A (en) * | 2021-11-25 | 2022-04-15 | 河海大学 | Plastic settlement measuring device for ultralight clay, use method and application |
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