CN106969693B - Expansion rate measuring device for test block of expansion filling body - Google Patents

Abstract

The invention provides a device for measuring the expansion ratio of an expanded filling body test block, which belongs to the technical field of mine filling. The device includes a metal base, a rigid column, and a clamping arm. The surface of the base is engraved with laser ray correction marks, circular/square scribe lines and a "cross"ruler; the metal base is screwed to a rigid column perpendicular to it, and the rigid column is marked with The holding mark fixed by the clamping arm; one end of the clamping arm is fixed to the column by bolts, and the other end is connected to the dial indicator. The middle position of the clamping arm is equipped with a laser transmitter, and the emitted rays are opposite to the laser ray calibration mark; the device is equipped with a standard The test block is used for calibration before measurement; the main components of the device are fixed by bolts or screwed, which can be disassembled and assembled. The invention can realize the expansion rate measurement of the filling body test block that meets the requirements of the test specification, has simple device, flexible application, small test error, and improves the precision, accuracy and reliability of the expansion rate detection of the filling body test block.

Description

A device for measuring the expansion ratio of an expanded filling body test block

technical field

The invention relates to the technical field of mine filling, in particular to a device for measuring the expansion ratio of a test block of an expanded filling body.

Background technique

Using tailings to fill goaf is an effective stope support and tailings treatment method, which can not only ensure the underground working environment, but also solve the problems of tailings occupation, underground goaf and surface subsidence. The stability of the backfill is the most critical factor when designing the backfill mining method. Studies have shown that the strength and deformation behavior of the backfill (settlement shrinkage/expansion) are the main parameters that determine the structural function of the backfill. There are many achievements, but the research on the deformation behavior of the backfill is gradually attracting extensive attention of scholars. At present, there is a lack of reasonable test devices and methods, and no matching test specifications. The insufficiency of the research on the deformation behavior of the backfill makes it impossible for engineers to accurately grasp the mechanical behavior of the backfill slurry after it enters the stope, which directly restricts the progress of backfill mining towards a more refined and efficient direction, thus limiting the level of utilization of mineral resources in my country. The deformation behavior of the backfill, especially the expansion behavior, plays an important role in the structural function of the backfill. The expansion of the backfill is beneficial to limit the movement of the surrounding rock, support the roof of the stope, absorb the stress released by the rock deformation, and effectively improve the performance of the deep stope. High stress environment, which can reduce the size of the ore pillar and improve the utilization rate of resources, improve the working environment of the stope and improve the labor efficiency. The expansion behavior can be characterized by the expansion rate, but when the expansion rate is too large, the strength of the filling body will be significantly deteriorated, and the interior of the filling body will show the phenomenon of "crisp" and disintegration, which makes the strength of the filling body fail. Therefore, it is necessary to conduct in-depth research on the expansion behavior of the filling body.

At present, there are two main types of expansion fillers: the original expansion-causing elements (such as sulfides) in the filling aggregate and the active addition of expansion agents to the filling material. There is currently no unified evaluation standard for the expansion performance of expanded fillers. In the literature, the evaluation of the stability of the backfill refers to rock mechanics and concrete hydraulic test specifications and methods. Vernier calipers are mostly used for measurement. The surface of the expanded filling body is rough and relatively fragile. The vernier calipers will directly contact the surface of the damaged test block during measurement, and the data measured multiple times are very discrete. In addition, the differences in the operation of the test personnel are difficult to be effective. The axial dimension of the test block is obtained, which makes the reliability of the expansion ratio test result poor.

In rock mechanics research, the standard GB/T 50266-2013 "Engineering Rock Mass Test Method Standard", DL/T 5368-2007 "Hydraulic and Hydropower Engineering Rock Test Regulations" and JTG E41-2005 "Highway Engineering Rock Test Regulations" are proposed in The method and equipment for rock block expansion test are described, but the test block required for the free expansion rate test in the standard is a cylinder block with a diameter of 50mm to 65mm and a height-diameter ratio of 1 or a cube with a side length of 50mm to 65mm. The cross section is parallel and the opposite side of the cube is parallel, but it is very difficult to prepare samples according to this standard for the backfill test block with low lime-sand ratio; at the same time, the regulations specify that the test equipment is "free expansion rate tester", and the rock test block is placed in it for continuous measurement. , read once every fixed time, but the research on the expansion behavior of the filling body focuses on the expansion rate of the initial (7d), mid-term (28d) and long-term (>90d), and the test block of the filling body requires certain curing conditions, and the free expansion rate test The instrument is also not suitable for placing in the curing box.

In the study of mechanical properties of concrete, mortar and cement slurry, the standard SL 352-2006 "Hydraulic Concrete Test Regulations", DL/T 5355-2006 "Hydraulic Test Regulations for Hydropower and Hydraulic Engineering" and JC/T 313-2009 "Expansion Cement" The test method for expansion rate of concrete, mortar and cement paste is mentioned in "Test Method for Expansion Rate", but in this standard, the test block required for expansion rate test is 100mm × 100mm × 515mm prismatic concrete test mold, 40mm × 40mm ×160mm prismatic mortar test mode and 25mm × 25mm × 280mm prismatic cement paste test mode, the building material lime sand is relatively high, and the strength of the test block is high. ), and the large consumption of materials is not conducive to repeated tests. Moreover, the test die of this specification does not have the ability to perform mechanical strength test, which reduces the compatibility between test parameters. Therefore, directly applying the test procedures, equipment and methods for the study of rock and concrete material properties to study the expansion behavior of the filling body will inevitably lead to deviations in the results.

SUMMARY OF THE INVENTION

In order to supplement the deficiencies of the test method and equipment in the research on the deformation behavior of the filling body, the present invention provides a device for measuring the expansion ratio of an expanded filling body test block.

The device includes a metal base, a rigid column and a clamping arm. The surface of the metal base is engraved with laser ray correction marks, circular/square scale lines and a "cross" ruler with scales; the metal base is screwed to the rigid column perpendicular to it, The rigid column is marked with the holding mark of the fixed position of the clamping arm; one end of the clamping arm is fixed to the rigid column by bolts, the other end is connected to a dial indicator, and the middle of the clamping arm is equipped with a laser transmitter; the dial indicator and the clamping arm Threaded connections are secured by bolts. The main components of the device are fixed by bolts or screwed together, which can realize disassembly and assembly.

The device is equipped with a standard test block for the calibration operation of the device for each measurement.

The circular/square scale line is used to assist the placement of the test block, and the circular/square scale line and the "cross" ruler assist the position of the test block during testing, so that the axis position of the test block is opposite to the measuring head of the dial indicator to ensure that every The measured data are all shaft lengths.

Laser transmitter, the ray emitted is opposite to the laser ray calibration mark, to ensure that the vertical direction of the dial indicator measuring head is facing the center of the "cross" scale.

The holding mark assists in determining the fixed position of the clamping arm, which can meet the requirements of the measurement of test blocks of different sizes in the test regulations.

The metal base is made of high-strength material and will not deform due to the placement of the heavier test block, which will affect the accuracy of the test data.

The dial indicator specification selection range is 30mm, which can meet the measurement requirements of the larger expansion test block.

When assembling the laser transmitter and the laser ray correction mark, ensure that the vertical direction of the dial indicator measuring head is directly at the center of the "cross" scale to avoid errors in the optical correction of the line of sight.

The standard test block refers to three cylinders, Ф50mm×70mm, Ф50mm×100mm and Ф50mm×150mm, made of materials with small thermal expansion coefficients, which are used for the calibration operation during each measurement.

The device realizes the disassembly and assembly of the main structure of the device through bolts and threads, so as to avoid accidental contact damage when the device is placed in the laboratory for a long time, which affects the measurement accuracy.

The beneficial effects of the above-mentioned technical solutions of the present invention are as follows:

The device can detect the size measurement and expansion rate test of the expanded filling body test block that meets the test requirements, the device is simple, the application is flexible, the test method is effectively simplified, the test error is greatly reduced, and the expansion rate of the expanded filling body test block is improved. The accuracy, reliability and accuracy of the measurement, provide a reliable guarantee for the more detailed research, design and comprehensive promotion of the filling mining method, and improve the utilization rate of my country's mineral resources.

Description of drawings

Fig. 1 is the structure schematic diagram of the expansion ratio measuring device of the expansion filling body test block of the present invention;

Fig. 2 is the top view of the device for measuring the expansion ratio of the expanded filling body test block of the present invention;

3 is a schematic structural diagram of a device for detecting the expansion ratio of a cylindrical filling body test block in Embodiment 2 of the present invention;

Figure 4 is a top view of the device in Figure 3;

5 is a schematic structural diagram of a device for detecting the expansion ratio of a cube filled body test block in Embodiments 3 and 4 of the present invention;

Figure 6 is a top view of the device in Figure 5;

7 is a schematic diagram of the detection of the flatness of the end face 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 .

Among them: 1- metal base; 2- rigid column; 3- clamping arm; 4- bolt; 5- dial indicator; 6- standard test block; 7- laser transmitter; 8- laser ray calibration mark; 9- " "Cross" ruler; 10-round/square engraved line; 11- blessing mark; 12- test block mark; 13-Ф75mm×150mm cylinder filling body test block; 14-70.7mm×70.7mm×70.7mm cube filling body test block; 15-Ф50mm×100mm cylindrical rock test block.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

The invention provides a device for measuring the expansion ratio of an expanded filling body test block.

Example 1

As shown in Figures 1 and 2, the device includes a metal base 1, a rigid column 2 and a clamping arm 3. The surface of the metal base 1 is engraved with laser ray correction marks 8, round/square scribe lines 10 and "" with scales. Cross" ruler 9; the metal base 1 is screwed to the rigid column 2 perpendicular to it, and the rigid column 2 is marked with a blessing mark 11 for the fixed position of the clamping arm 3; one end of the clamping arm 3 is fixed to the rigid column 2 by bolts 4, and the other One end is connected to the dial indicator 5, and the middle position of the clamping arm 3 is equipped with a laser transmitter 7; The device is equipped with a standard test block 6 for the calibration operation of the device for each measurement. The main components of the device are fixed by bolts or screwed, which can realize disassembly and assembly.

The expansion ratio detection step includes device assembly, dimension measurement and expansion ratio calculation. The device is assembled and calibrated, the metal base 1, the rigid column 2, the clamping arm 3 and the dial indicator 5 are connected, and the laser transmitter 7 and the laser beam calibration mark 8 are used to make the axis of the dial indicator measuring rod pass through the "cross" of the base. ” to the center of ruler 9, and then fix each connection. Finally, place the corresponding calibration test block on the base to zero the dial indicator.

The dimension measurement step refers to the length of the axis of the test block, and the cylinder test block measures the height of the axis of the cylinder: H _d . The calculation step of the expansion ratio is to define the initial size H _o , and then measure the size H _d of the test block at the design age according to the research purpose. Calculate the expansion rate.

The laser transmitter and the laser calibration mark are used for the calibration of the device, and the metal base 1, the rigid column 2, the clamping arm 3 and the dial indicator 5 are connected. Turn on the laser transmitter 7 to project the ray to the laser ray correction mark 8, and at the same time, the axis of the dial indicator measuring rod passes through the center of the "cross" scale 9 of the base, and at the same time, each connection is fixed.

This embodiment is the most basic implementation. The clamping arm is equipped with a laser transmitter, and the axis of the column, the axis of the laser transmitter and the axis of the dial indicator measuring rod are located on a plane and are parallel to each other. After the ray of the laser transmitter is projected to the correction mark, each connection is fixed, and the setting of the correction ray can ensure that each test device is effective. It is simple and feasible to use this method to test the expansion rate of the inflatable filling body. Practice has proved that the measurement of the expansion rate of the inflatable filling body is highly accurate and reliable in the data set of the axial length of the test block in a single repeated test.

Example 2

A detection device for the expansion rate of an expanded filling body test block, comprising a metal base 1, a rigid column 2, a clamping arm 3, a laser ray correction mark 8 engraved on the surface of the metal base 1, and a circular/square engraved line for auxiliary test block placement 10 and the "cross" scale 9 with a scale to 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 screwed to the rigid column 2 perpendicular to it, The rigid column 2 is marked with the holding mark 11 for the fixed position of the clamping arm; the clamping arm 3 is fixed to the rigid column 2 by one end of the bolt 4, and the other end is connected to a large-scale (30mm) dial indicator 5 to realize a large expansion test block The middle position of the clamping arm 3 is equipped with a laser transmitter 7, and the emitted rays are opposite to the laser ray calibration mark 8, so as to ensure that the vertical direction of the dial indicator 5 is facing the center of the “cross” scale 9 of the base; the device is equipped with The standard test block 6 is used for the calibration operation during each measurement; the main components of the device are fixed by bolts or screwed, which can realize disassembly and assembly.

The expansion ratio detection step includes device assembly, dimension measurement and expansion ratio calculation. The device is assembled and calibrated, the metal base 1, the rigid column 2, the clamping arm 3 and the dial indicator 5 are connected, and the laser transmitter 7 and the laser beam calibration mark 8 are used to make the axis of the dial indicator 5 measure the rod pass through the "" of the base. Cross" ruler 9 center, and then fix each connection. Finally, place the corresponding calibration test block on the base to zero the dial indicator. The step of dimension measurement refers to the axial length of the test block, and the cylindrical test block measures the height of the cylindrical axis: H _d . The calculation step of the expansion ratio is to define the initial size H _o , and then measure the size H _d of the test block at the design age according to the research purpose. Calculate the expansion rate.

The laser transmitter and the laser calibration mark are used for the calibration of the device in the measurement step, and connect the metal base 1 , the rigid column 2 , the clamping arm 3 and the dial indicator 5 . When the laser transmitter 7 is turned on, the ray is projected to the laser ray correction mark 8, and the axis of the dial indicator measuring rod passes through the center of the "cross" scale of the base, and each connection is fixed at the same time.

The standard test block refers to a Ф50mm×150mm cylinder with a low thermal expansion coefficient, which is used for the calibration operation in each measurement to ensure the effectiveness of the device.

As shown in FIG. 3 and FIG. 4 , in this embodiment, a Ф75mm×150mm cylinder is used to fill the test block 13 , and a test block mark 12 is set on the metal base 1 .

This embodiment is the most basic implementation. The assembled device uses standard test blocks for calibration operation to ensure the validity of the test. The device is equipped with three standard test blocks to adapt to various specifications of expansion and filling bodies. Test block expansion rate detection. It is simple and feasible to use this method to test the expansion rate of the inflatable filling body. Practice has proved that the measurement of the expansion rate of the inflatable filling body is highly accurate and reliable in the data set of the axial length of the test block in a single repeated test.

Example 3

Referring to Figures 5 and 6, a device for detecting the expansion rate of an expanded filling body test block includes a metal base 1, a rigid column 2, and a clamping arm 3. The surface of the metal base is engraved with a laser ray correction mark 8, and the auxiliary test block is placed. The circular/square scale line 10 and the "cross" scale 9 with scale 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 screw connection on the metal base is perpendicular to it The rigid column is marked with the holding mark 11 for the fixed position of the clamping arm; the clamping arm is fixed to the column by one end of the bolt 4, and the other end is connected with a large-range (30mm) dial indicator to realize the large expansion of the test block. Measurement; the middle position of the clamping arm is equipped with a laser transmitter 7, and the emitted rays are opposite to the laser ray calibration mark 8, to ensure that the vertical direction of the dial indicator measuring head is facing the center of the "cross" scale of the base; the device is equipped with a standard test block 6 , which is used for the calibration operation during each measurement; the main components of the device are fixed by bolts or screwed, which can be disassembled and assembled.

计算膨胀率。The expansion ratio detection step includes device assembly, dimension measurement and expansion ratio calculation. The device is assembled and calibrated, the base 1, the column 2, the clamping arm 3 and the dial indicator 5 are connected, and the laser transmitter 7 and the laser beam calibration mark 8 are used to make the axis of the dial indicator measuring rod pass through the "cross" scale of the base Center, and then fix each connection. Finally, place the corresponding calibration test block on the base to zero the dial indicator. The dimension measurement step refers to placing 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 to measure the height of the cylinder axis: H _d . The calculation step of the expansion ratio is to define the initial size H _o , and then measure the size H _d of the test block at the design age according to the research purpose.

Calculate the expansion rate.

The laser transmitter and the laser calibration mark are used for the calibration of the device in the measurement step, and connect the metal base 1 , the rigid column 2 , the clamping arm 3 and the dial indicator 5 . When the laser transmitter is turned on, the ray is projected to the laser ray correction mark 8, and the axis of the dial indicator measuring rod passes through the center of the "cross" scale of the base, and each connection is fixed at the same time.

The standard test block is a Ф50mm×150mm cylinder with a low thermal expansion coefficient, which is used for the calibration operation during each measurement to ensure the effectiveness of the device.

When fixing the clamping arm, the clamping arm fixing mark 11 is engraved on the column, which makes it more convenient and concise to adjust the fixing height of the holding wall when measuring the test blocks of different sizes.

This embodiment is a preferred implementation. When performing the performance test of the filling body, different specifications of the test molds will be selected for different research purposes. In order to improve the applicability of the device to the measurement of the expansion ratio of different specifications There is a fixed mark of the clamping arm, and the clamping arm has a certain fixed position for the expansion rate detection of a certain size of the test block. Practice has proved that a single repeated test block axis length data set can measure the expansion rate of the expansion filling body with high accuracy and reliability.

Example 4

Referring to Figures 5 and 6, a device for detecting the expansion rate of an expanded filling body test block includes a metal base 1, a rigid column 2, and a clamping arm 3. The surface of the metal base is engraved with a laser ray correction mark 8, and the auxiliary test block is placed. The circular/square scale line 10 and the "cross" scale 9 with scale 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 screw connection on the metal base is perpendicular to it The rigid column is marked with the holding mark 11 for the fixed position of the clamping arm; the clamping arm is fixed to the column by one end of the bolt 4, and the other end is connected with a large-range (30mm) dial indicator to realize the large expansion of the test block. Measurement; the middle position of the clamping arm is equipped with a laser transmitter 7, and the emitted rays are opposite to the laser ray calibration mark 8, to ensure that the vertical direction of the dial indicator measuring head is facing the center of the "cross" scale of the base; the device is equipped with a standard test block 6 , which is used for the calibration operation during each measurement; the main components of the device are fixed by bolts or screwed together, which can be disassembled and assembled.

算得立方体轴心长度。膨胀率计算步骤是指，定义初始尺寸H_o，再按照研究目的在设计的龄期测量试块的尺寸H_d，通过

计算膨胀率。The expansion ratio detection step includes device assembly, dimension measurement and expansion ratio calculation. The device is assembled and calibrated, the metal base 1, the rigid column 2, the clamping arm 3 and the dial indicator 5 are connected, and the laser transmitter 7 and the laser beam calibration mark 8 are used to make the axis of the dial indicator measuring rod pass through the "cross" of the base. ” the center of the ruler, and then fix each connection. Finally, place the corresponding calibration test block on the base to zero the dial indicator. The dimension measurement step refers to the axial length of the test block. The cube test block measures the axial lengths of the front A, top B, and side C: H _{A, d} , H _{B, d} , H _{B, d} , and then by formula

Calculate the length of the axis of the cube. The calculation step of the expansion ratio is to define the initial size H _o , and then measure the size H _d of the test block at the design age according to the research purpose.

Calculate the expansion rate.

The laser transmitter and the laser calibration mark are used for the calibration of the device in the measurement step, and connect the metal base 1 , the rigid column 2 , the clamping arm 3 and the dial indicator 5 . Turn on the laser transmitter to project the ray to the laser ray correction mark 8, and at the same time, the axis of the dial indicator measuring rod passes through the center of the "cross" scale of the base, and at the same time, fix each connection.

The standard test block is a Ф50mm×150mm cylinder with a low thermal expansion coefficient, which is used for the calibration operation during each measurement to ensure the effectiveness of the device.

When fixing the clamping arm, a clamping arm fixing mark 11 is engraved on the rigid column, which makes it more convenient and concise to adjust the fixing height of the clamping arm when measuring test blocks of different sizes.

The auxiliary circular/square engraved line 10 and the "cross" scale 9 means that the Ф75mm×150mm cylindrical test block 14 is placed on the base 1 in the measurement step, and the auxiliary circular/square engraved line 10 and the "cross" scale 9 are used to ensure The axis of the test block is facing the measuring head of the dial indicator 5.

This embodiment is a best implementation. When the auxiliary circular/square scribe line and the "cross" ruler on the base are measured, the position of the test block is more accurate, so that the measured data are all the dimensions of the axis of the test block , improve the reliability of data and the ease of testing. It is simple and feasible to use this method to test the expansion rate of the sulfur-containing backfill block. Practice has proved that the accuracy and reliability of the expansion rate of the test block with a single repeated test is high.

Example 5

Referring to Figures 7 and 8, a device for detecting the expansion rate of an expanded filling body test block includes a metal base 1, a rigid column 2, and a clamping arm 3. The surface of the metal base is engraved with a laser ray correction mark 8, and the auxiliary test block is placed. The circular/square scale line 10 and the "cross" scale 9 with scale 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 screw connection on the metal base is perpendicular to it The rigid column is marked with the holding mark 11 for the fixed position of the clamping arm; the clamping arm is fixed to the column by one end of the bolt 4, and the other end is connected with a large-range (30mm) dial indicator to realize the large expansion of the test block. Measurement; the middle position of the clamping arm is equipped with a laser transmitter 7, and the emitted rays are opposite to the laser ray calibration mark 8, to ensure that the vertical direction of the dial indicator measuring head is facing the center of the "cross" scale of the base; the device is equipped with a standard test block 6 , which is used for the calibration operation during each measurement; the main components of the device are fixed by bolts or screwed together, which can be disassembled and assembled.

The laser transmitter and the laser calibration mark are used for the calibration of the device in the measurement step, and connect the metal base 1 , the rigid column 2 , the clamping arm 3 and the dial indicator 5 . Turn on the laser transmitter to project the ray to the laser ray correction mark 8, and at the same time, the axis of the dial indicator measuring rod passes through the center of the "cross" scale of the base, and at the same time, fix each connection.

The standard test block refers to a Ф50mm×100mm cylinder with a low thermal expansion coefficient, which is used for the calibration operation during each measurement to ensure the effectiveness of the device.

When fixing the clamping arm, a clamping arm fixing mark 11 is engraved on the upright column, which makes it more convenient and concise to adjust the fixing height of the clamping arm when measuring test blocks of different sizes.

In the inspection step, place the Ф50mm×100mm cylindrical rock test block 15 on the metal base 1, move along the “cross” scale 9 from one end to the other end, and record the axial dimension every time a scale is moved; After the end, change to another vertical ruler, and measure it once every time it passes through a tick. After testing one end, follow the same method to test the next end face.

This embodiment is a popularization and application of the device. The expansion ratio detection device is used to detect the flatness of the end faces of rock and concrete test blocks. Before the mechanical strength test of rock and concrete test blocks, it is necessary to test the accuracy of the test blocks. Install and correct the expansion rate detection device of the expanded filling body test block, place the processed rock test block on its base, move the test block in two orthogonal directions, and continuously measure the axial length on the surface of the test block. The device is equipped with a dial indicator with an accuracy of 0.01mm to meet the test block inspection requirements. Practice has proved that this device replaces the vernier caliper to test the parallelism of the cross-section of the test block.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (1)

1. A device for measuring the expansion ratio of an expanded filling body test block, characterized in that it comprises a metal base (1), a rigid column (2) and a clamping arm (3), and the surface of the metal base (1) is engraved with a laser ray calibration mark (8), circular/square scale line (10) and “cross” scale with scale (9); rigid post (2) threaded on metal base (1) perpendicular to it, and markings on rigid post (2) There is a holding mark (11) at the fixed position of the clamping arm (3); one end of the clamping arm (3) is fixed to the rigid column (2) by a bolt (4), and the other end is connected to a dial indicator (5), and the clamping arm ( 3) The middle position is equipped with a laser transmitter (7); the dial indicator (5) and the clamping arm (3) are fixedly threadedly connected by bolts (4); The device is equipped with a standard test block (6) for the calibration operation of the device for each measurement; The laser transmitter (7) emits a ray opposite to the laser ray calibration mark (8), ensuring that the vertical direction of the dial indicator (5) measuring head is facing the center of the "cross" scale (9); The laser transmitter (7) and the laser ray correction mark (8) ensure that the dial indicator (5) is vertically aligned with the center of the "cross" scale (9) in the vertical direction during assembly; The standard test block (6) refers to three cylinders, Ф50 mm×70 mm, Ф50 mm×100 mm and Ф50 mm×150 mm, made of materials with small thermal expansion coefficients, which are used for calibration operations during each measurement; The circular/square engraved line (10) is used to assist the placement of the test block, so that the position of the axis of the test block is opposite to the measuring head of the dial indicator, so as to ensure that the data measured each time is the length of the axis; The metal base (1) is made of high-strength material; The specification selection range of the dial indicator (5) is 30 mm.

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