Coaxiality adjusting device and method for testing machine
阅读说明：本技术 用于试验机的同轴度调整装置及方法 (Coaxiality adjusting device and method for testing machine ) 是由 赵宏伟 孟凡越 张建海 陈俊先 侯伟光 石成玉 秦学志 赵久成 赵大庆 于 2019-12-02 设计创作，主要内容包括：本发明涉及一种用于试验机的同轴度调整装置及方法,属于同轴度校准领域。整体安装在立式拉伸试验机上,包括主轴加载链、同轴度调整机构、检测及反馈机构、机架,同轴度调整机构安装在主轴加载链上,主轴加载链安装在机架上,检测及反馈机构安装在机架上,用于检测和控制调整量。该装置可调整加载链三个自由度,对调整轴进行分度,使调整量达到0.01mm/格,调整范围为±1mm,不仅可以实现在单轴拉伸试验机上进行单向拉伸,而且还可以再增设一套调整装置实现双向拉伸对中调整,装置适配性强,能够匹配不同轴径夹具或加载链,空间占用小,操作简单,可重复调整,能够提高实验精度,使测量数据更加精确。(The invention relates to a coaxiality adjusting device and method for a testing machine, and belongs to the field of coaxiality calibration. The whole device is arranged on a vertical tensile testing machine and comprises a main shaft loading chain, a coaxiality adjusting mechanism, a detection and feedback mechanism and a rack, wherein the coaxiality adjusting mechanism is arranged on the main shaft loading chain, the main shaft loading chain is arranged on the rack, and the detection and feedback mechanism is arranged on the rack and used for detecting and controlling the adjustment amount. The three degree of freedom of the adjustable loading chain of the device, carry out the graduation to the adjusting spindle, make the adjustment volume reach 0.01 mm/check, the adjustment range is 1mm, not only can realize carrying out unidirectional stretching on unipolar tensile testing machine, but also can add one set of adjusting device again and realize the alignment adjustment of biaxial stretching, device suitability is strong, can match different footpath anchor clamps or loading chain, the space occupies for a short time, easy operation, can repeatedly adjust, can improve the experiment precision, make measured data more accurate.)
1. The utility model provides a axiality adjusting device for testing machine which characterized in that: the device is integrally arranged on a vertical tensile testing machine and comprises a main shaft loading chain, a coaxiality adjusting mechanism, a detection and feedback mechanism and a rack, wherein the coaxiality adjusting mechanism is arranged on the main shaft loading chain which is arranged on the rack, and the detection and feedback mechanism is arranged on the rack to detect and control the adjustment quantity;
the main shaft loading chain is as follows: the electric actuating cylinder (19) is arranged on the upper top cover (21), an electric cylinder connecting shaft (23) is arranged on an output shaft of the electric actuating cylinder (19), the six-dimensional force sensor (1) is arranged on the electric cylinder connecting shaft (23), and the six-dimensional force sensor (1) is positioned on the electric cylinder connecting shaft (23) through a positioning pin (9); a parent body (3) of the coaxiality adjusting mechanism is arranged at the other end of the six-dimensional force sensor (1), a clamp connecting shaft (8) is arranged on the parent body (3) through a main shaft connecting bolt (12), and an upper clamp (13) is arranged on the clamp connecting shaft (8); the test piece (16) is tightly pressed and installed in the upper clamp (13) through the cover plate (14), the lower clamp (17) is installed on the supporting seat (18) through a flange, the supporting seat (18) is installed on the rotating platform (26) through a flange, and the rotating platform (26) is installed on the lower platform (24) through a flange.
2. The coaxiality adjusting apparatus for a testing machine according to claim 1, wherein: the coaxiality adjusting mechanism is as follows: four adjusting shafts (4) are arranged on a parent body (3), a thrust ball bearing (5) is arranged in a middle adjusting block (6), a pin shaft sleeve (27) is arranged on the parent body (3), and a positioning pin (9) is arranged on the pin shaft sleeve (27); the middle adjusting block (6) is positioned and installed on the parent body (3) by two positioning pins (9), and the pin shaft spring (10) is installed in a pin shaft hole of the parent body (3) and connected with the parent body (3) and the middle adjusting block (6).
3. The coaxiality adjusting apparatus for a testing machine according to claim 1, wherein: the detection and feedback system is as follows: the six-dimensional force sensor (1) is installed on a loading chain, the host and the processor are connected with the six-dimensional force sensor (1) through a USB data line and installed on the rack, and the electric actuating cylinder (19) outputs displacement information to be transmitted to the host.
4. The coaxiality adjustment apparatus for a testing machine according to claim 1 or 3, wherein: the electric actuating cylinder (19) adopts a folding type electric cylinder CDJ2D16-100Z-M9B-B, and the stroke of the electric cylinder is 100 mm.
5. The coaxiality adjusting apparatus for a testing machine according to claim 1, wherein: the frame is as follows: the upper top cover (21) is arranged on four guide columns (22) through adjusting nuts (20), the guide columns (22) are arranged on a lower platform (24), and the lower platform (24) is arranged on a vibration isolation platform (25).
6. A coaxiality adjusting method for a testing machine is characterized by comprising the following steps: the method comprises the following steps:
step (1), an electric actuating cylinder (19) is installed on a rack, the electric actuating cylinder is connected with a six-dimensional force sensor (1) through an electric cylinder connecting shaft (23), an upper clamp (13) and the six-dimensional force sensor (1) are connected through a flange, and a matrix (3) of a coaxiality adjusting mechanism is installed;
step (2), assembling all components of the coaxiality adjusting mechanism;
step (3), mounting the rotating table (26) on the lower platform (24), locking the relative position of the rotating table (26) and the supporting seat (18), and finally mounting the cover plate (14) and pressing the test piece (16);
step (4), adjusting device installation and calibration: adjusting the adjusting shafts (4) in four directions on the parent body, checking whether the axial corresponding force values and torques of the adjusting shafts of the six-dimensional force sensor (1) are changed singly or not, and if not, rotating the directions of the rotating table (26) and the centering ring until the axial values of the six-dimensional force sensor (1) corresponding to the four directions of the adjusting shafts are changed singly, thereby completing the installation and calibration of the adjusting device;
step (5), pre-stretching the test piece, loading in elastic deformation, and recording sensor data;
step (6), fine-tuning the adjusting shafts (4) in all directions in the loading process, checking the numerical value of the six-dimensional force sensor (1), and rotating the lower rotary table (26) and the upper clamp (13) until the variation numerical value of the corresponding fine-tuning direction is less than 5% of the loading force and does not increase along with the loading force;
step (7), continuing loading until the force value reaches the elastic limit, keeping the bias force within 5 percent of the loading force or keeping the bias force with small variation, or acquiring the displacement output by the electric actuating cylinder (19), calculating corresponding strain and stress and checking whether the bias force is within the qualified range;
and (8) simulating the loading chain, calculating the offset according to the displacement and the corresponding direction force value of the sensor, then calculating and distributing the offset to each axial adjustment amount, adjusting the corresponding adjustment shaft (4), and finally finishing the loading calibration of the adjustment device.
7. The coaxiality adjustment method for the testing machine according to claim 6, wherein: assembling the components of the coaxiality adjusting mechanism in the step (2), specifically:
2.1, mounting the matrix on a six-dimensional force sensor (1) through six hexagon socket head cap bolts, and sequentially pre-tightening two opposite bolts;
2.2, installing a thrust ball bearing (5) in a middle adjusting block (6), installing eight pin shaft sleeves (27) and four adjusting shafts (4) on a parent body in four directions, and installing a positioning pin (9) in the pin shaft sleeves (27);
2.3, installing four middle adjusting blocks (6) in four directions of the parent body (3), positioning the bottom surface of the parent body (3) by eight positioning pins (9), sleeving the pin shaft spring (10) on the pin shaft (9), placing the pin shaft spring in the parent body (3) and the middle adjusting blocks (6), and enabling the pin shaft spring (10) to be in a compressed state;
2.4, mounting a centering ring to ensure that the front direction of the lower clamp (17) is consistent with the adjusting direction of the centering adjusting mechanism;
2.5, mounting the centering ring and the clamp, pre-tightening the bolt, and finely adjusting the direction and then screwing the connecting bolt;
2.6, installing the test piece (16) and the cover plate (14).
Technical Field
The invention relates to the field of coaxiality calibration, in particular to a coaxiality adjusting device and method for a testing machine, which are arranged on the testing machine to calibrate the coaxiality of a loading chain.
Background
With the development of economy and the progress of science and technology, the tester industry is developed vigorously like the spring bamboo shoots after rain, various testers with different purposes are continuously emerged, the tester can measure the mechanical property, the process property, the internal defect, the dynamic unbalance amount of the checking rotating part and the like of materials, and the tester is more and more widely applied to the fields of the mechanical industry and the like. The traditional coaxiality adjusting mode of the testing machine is manual adjustment, but the manual adjustment is low in efficiency, different in standard and limited in adjusting amount, and results such as damage, unqualified precision, poor stability and the like of the testing machine are easily caused.
Disclosure of Invention
The invention aims to provide a coaxiality adjusting device and method for a testing machine, which solve the problem that the coaxiality of a loading chain of the existing testing machine needs to be disassembled and cannot be adjusted in real time, and fill the blank of the prior art to a certain extent. The invention can be installed with other kinds of testing machines such as compression testing machine, torsion testing machine, bending testing machine, universal testing machine, etc.; the matched clamps are various in types, small in occupied space, simple to operate and capable of being adjusted repeatedly; simultaneously, the adjusting shaft is indexed to enable the adjusting amount to reach 0.01mm and the adjusting range to be large (plus or minus 0.5 mm); the combination of the device and the clamp selecting and assembling table can realize the adjustment of three degrees of freedom (the loading chain mounting plane and the loading chain axially rotate); vulnerable parts (a tip, a pin sleeve, a pin shaft and the like) and parts with high positioning precision requirements in the adjusting device are in standardized design, and easy-to-machine parts such as the pin sleeve and the like and standard parts are adopted; the device has strong adaptability, and loading chains with different shaft diameters can be installed by adjusting the sizes of the parent body and other parts; the connection loading chain adopts flange connection to improve the strength and eliminate the gap; each middle adjusting block is positioned by two pin shafts on the parent body and the lower surface of the parent body (one surface is provided with two pins); the invention is arranged on a testing machine, can realize unidirectional stretching on a uniaxial tensile testing machine, can also realize bidirectional stretching by additionally arranging a set of adjusting device, can improve the experimental precision and enables the measured data to be more accurate.
The above object of the present invention is achieved by the following technical solutions:
the coaxiality adjusting device for the testing machine is integrally installed on the vertical tensile testing machine and comprises a main shaft loading chain, a coaxiality adjusting mechanism, a detection and feedback mechanism and a rack, wherein the coaxiality adjusting mechanism is installed on the main shaft loading chain, the main shaft loading chain is installed on the rack, and the detection and feedback mechanism is installed on the rack to detect and control the adjustment amount.
The main shaft loading chain is as follows: the electric actuating
The coaxiality adjusting mechanism is as follows: the four adjusting shafts 4 are arranged on the parent body 3, the thrust ball bearing 5 is arranged in the middle adjusting block 6, the pin shaft sleeve 27 is arranged on the parent body 3, and the positioning pin 9 is arranged on the pin shaft sleeve 27; the middle adjusting block 6 is positioned and installed on the parent body 3 by two positioning pins 9, and the pin shaft spring 10 is installed in a pin shaft hole of the parent body 3 and connected with the parent body 3 and the middle adjusting block 6. The main shaft connecting shaft is arranged on the parent body, and the centering ring is arranged on the parent body through the main shaft connecting shaft.
The detection and feedback system is as follows: the six-dimensional force sensor 1 is arranged on a loading chain, the host and the processor are connected with the six-dimensional force sensor 1 through a USB data line and arranged on the rack, and the electric actuating
The electric actuating
The six-dimensional force sensor adopts HBM-U10M, and the maximum measuring range of the force sensor is 125 KN.
The grating ruler adopts Heidenhain-Aelb-382c, and the maximum measuring range of the grating ruler is 250 mm.
The frame is as follows: the
Another object of the present invention is to provide a coaxiality adjusting method for a testing machine, comprising the steps of:
step (1), an electric actuating
step (2), assembling all components of the coaxiality adjusting mechanism:
2.1, mounting the matrix on a six-dimensional force sensor 1 through six hexagon socket head bolts, and sequentially pre-tightening two opposite bolts;
2.2, installing a thrust ball bearing 5 in a middle adjusting block 6, installing eight pin shaft sleeves 27 and four adjusting shafts 4 on a parent body in four directions, and installing a positioning pin 9 in the pin shaft sleeves 27;
2.3, mounting four middle adjusting blocks 6 on the parent body 3 in four directions, positioning the bottom surface of the parent body 3 by eight positioning pins 9, sleeving a pin shaft spring 10 on the pin shaft 9, placing the pin shaft spring in the parent body 3 and the middle adjusting blocks 6, and enabling the pin shaft spring 10 to be in a compressed state;
2.4, mounting a centering ring to ensure that the front direction of the
2.5, mounting the centering ring and the clamp, pre-tightening the bolt, and finely adjusting the direction and then screwing the connecting bolt;
2.6, installing a
step (3), mounting the
step (4), adjusting device installation and calibration: adjusting the adjusting shafts 4 in four directions on the parent body, checking whether the axial corresponding force values and torques of all the adjusting shafts of the six-dimensional force sensor 1 are changed singly or not, otherwise, rotating the directions of the rotating table 26 and the centering ring until the axial values of the six-dimensional force sensor 1 corresponding to the four directions of the adjusting shafts are changed singly, and finishing the installation and calibration of the adjusting device;
step (5), pre-stretching the test piece, loading in elastic deformation, and recording sensor data;
step (6), fine-tuning the adjusting shafts 4 in all directions in the loading process, checking the numerical values of the six-dimensional force sensor 1, and rotating the lower rotary table 26 and the clamp connecting shaft 8 until the variation numerical value of the corresponding fine-tuning direction is less than 5% of the loading force and does not increase along with the loading force;
step (7), continuing loading until the force value reaches the elastic limit, keeping the bias force within 5 percent of the loading force or keeping the bias force with small variation, or acquiring the displacement output by the electric actuating
and (8) simulating the loading chain, calculating the offset according to the displacement and the corresponding direction force value of the sensor, then calculating and distributing the offset to each axial adjustment amount, adjusting the corresponding adjustment shaft 4, and finally finishing the loading calibration of the adjustment device.
The invention has the beneficial effects that: the device is integrally arranged on the testing machine, so that the problems that the coaxiality of the loading chain of the existing testing machine needs to be disassembled and the loading chain cannot be adjusted in real time are solved, and the blank of the prior art is filled to a certain extent; other kinds of testing machines such as a compression testing machine, a torsion testing machine, a bending testing machine, a universal testing machine and the like can be installed; the matched clamps are various in types, small in occupied space, simple to operate and capable of being adjusted repeatedly; simultaneously, the adjusting shaft is indexed to enable the adjusting amount to reach 0.01mm and the adjusting range to be large (plus or minus 0.5 mm); the combination of the device and the clamp selecting and assembling table can realize the adjustment of three degrees of freedom (the loading chain mounting plane and the loading chain axially rotate); the quick-wear parts and the parts with high positioning precision requirement in the adjusting device are standardized in design, and easy-to-work parts such as pin sleeves and the like and standard parts are adopted; the device has strong adaptability, and loading chains with different shaft diameters can be installed by adjusting the sizes of the parent body and other parts; the connection loading chain adopts flange connection to improve the strength and eliminate the gap; each middle adjusting block is positioned by two pin shafts on the parent body and the lower surface of the parent body (one surface is provided with two pins); the invention is arranged on a testing machine, can realize unidirectional stretching on a uniaxial tensile testing machine, can also realize bidirectional stretching by additionally arranging a set of adjusting device, can improve the experimental precision and enables the measured data to be more accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a cross-sectional view of a coaxiality adjustment mechanism of the present invention;
FIG. 2 is an isometric view of the coaxiality adjustment mechanism of the present invention;
FIG. 3 is an exploded view of the coaxiality adjustment mechanism of the present invention;
FIG. 4 is a drawing of a tensile test piece of the coaxiality adjustment mechanism of the present invention;
FIG. 5 is a front view of the complete machine of the present invention;
FIG. 6 is a perspective view of the complete machine of the present invention;
FIG. 7 is a diagram of a centering device according to the present invention.
In the figure: 1. a six-dimensional force sensor; 2. a sensor connecting bolt; 3. a parent body; 4. an adjustment shaft; 5. a thrust ball bearing; 6. a middle adjusting block; 7. a tip; 8. a clamp connecting shaft; 9. positioning pins; 10. a pin spring; 11. a clamp connecting bolt; 12. a main shaft connecting bolt; 13. an upper clamp; 14. a cover plate; 15. a clamp cover plate bolt; 16. a test piece; 17. a lower clamp; 18. a clamp supporting seat; 19. an electrically actuated cylinder; 20. adjusting the nut; 21. a top cover is arranged; 22. a guide post; 23. an electric cylinder connecting shaft; 24. a lower platform; 25. a vibration isolation table; 26. a rotating table; 27. a pin bush; 28. the support seat is connected with a bolt.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 7, the coaxiality adjusting device and method for the testing machine of the invention solve the problem that the coaxiality of the loading chain of the existing testing machine needs to be disassembled and the loading chain cannot be adjusted in real time, and fill the blank of the prior art to a certain extent; the device can adjust three degrees of freedom of the loading chain, and index the adjusting shaft, so that the adjusting amount reaches 0.01 mm/grid, and the adjusting range is +/-1 mm; moreover, the easily-damaged parts and the parts with high positioning precision requirement in the adjusting device are in standardized design, and easily-processed parts such as pin sleeves and pin shafts and standard parts are adopted; the device installs on the testing machine, not only can realize carrying out unidirectional stretching on unipolar tensile testing machine, but also can add one set of adjusting device again and realize the adjustment of biaxial stretching centering, and device suitability is strong, can match different footpath anchor clamps or loading chain, and the space occupies for a short time, and easy operation can repeatedly adjust, can improve the experiment precision, makes measured data more accurate.
Referring to fig. 5 and 6, the coaxiality adjusting device for the testing machine of the present invention is integrally installed on a vertical tensile testing machine, and includes a main shaft loading chain, a coaxiality adjusting mechanism, a detecting and feedback mechanism, and a frame, wherein the coaxiality adjusting mechanism is installed on the main shaft loading chain, the main shaft loading chain is installed on the frame, and the detecting and feedback mechanism is installed on the frame and is used for detecting and controlling an adjustment amount.
The main shaft loading chain comprises an electric action electric cylinder 19, an electric cylinder connecting shaft 23, a six-dimensional force sensor 1, a coaxiality adjusting mechanism matrix 3, a clamp connecting shaft 8, an upper clamp 13, a cover plate 14, a test piece 16, a lower clamp 17, a supporting seat 18, a rotating table 26, a sensor connecting bolt 2, a clamp connecting bolt 11, a clamp cover plate bolt 15 and a supporting seat connecting bolt 28; the electric actuating cylinder 19 is mounted on the upper cover top 21 through an outer hexagon bolt, the electric cylinder connecting shaft 23 is mounted on an output shaft of the electric actuating cylinder 19 through six inner hexagon bolts, the six-dimensional force sensor 1 is mounted on the electric cylinder connecting shaft 23 through six sensor connecting bolts 2, and the six-dimensional force sensor 1 is positioned on the electric cylinder connecting shaft 23 through a positioning pin 9; a parent body 3 of the coaxiality adjusting mechanism is arranged at the other end of the six-dimensional force sensor 1 through six hexagon socket head cap bolts, a clamp connecting shaft 8 is arranged on the parent body 3 through a main shaft connecting bolt 12, and an upper clamp 13 is arranged on the clamp connecting shaft 8 through six clamp connecting bolts 11; the tightening clamp cover plate bolt 15 compresses the test piece 16 to be installed in the upper clamp 13, the lower clamp 17 is installed on the supporting base 18 through the supporting base connecting bolt 28, the supporting base 18 is installed on the rotating platform 26 through a flange, and the rotating platform 26 is installed on the lower platform 24 through a flange.
The coaxiality adjusting mechanism comprises a matrix 3, an adjusting shaft 4, a thrust ball bearing 5, a middle adjusting block 6, a positioning pin 9, a pin shaft sleeve 27, a pin shaft spring 10, a clamp connecting shaft 8, a main shaft connecting screw bolt 12 and a tip 7; the four adjusting shafts 4 are arranged on the parent body 3, the thrust ball bearing 5 is arranged in the middle adjusting block 6, the tip 7 is arranged on the middle adjusting block 6, the pin shaft sleeve 27 is arranged on the parent body 3, and the positioning pin 9 is arranged on the pin shaft sleeve 27; the middle adjusting block 6 is positioned and installed on the parent body 3 through two positioning pins 9, the pin shaft spring 10 is installed in a pin shaft hole of the parent body 3 and is connected with the parent body 3 and the middle adjusting block 6 at the same time, the spindle connecting bolt 12 is installed on the parent body 3, and finally the clamp connecting shaft 8 is installed on the parent body 3 through the spindle connecting bolt 12.
The detection and feedback system comprises a six-dimensional force sensor 1, a host and a processor; the six-dimensional force sensor 1 is arranged on a loading chain, the host and the processor are connected with the six-dimensional force sensor 1 through a USB data line and are arranged on the rack to receive and process data, and the
The
The six-dimensional force sensor adopts HBM-U10M, and the maximum measuring range of the force sensor is 125 KN.
The grating ruler adopts Heidenhain-Aelb-382c, and the maximum measuring range of the grating ruler is 250 mm.
The machine frame comprises four
Referring to fig. 1 to 4, when in use, the matrix 3 is firstly installed on the six-dimensional force sensor 1 through six hexagon socket head cap bolts, and then two opposite bolts are sequentially pre-tightened (to prevent the device from being locked); the thrust ball bearing 5 is arranged in the middle adjusting block 6, the pin shaft sleeves 27 (8 in total) and the adjusting shafts 4 (4 in total) in four directions on the parent body 3 are arranged, and the positioning pins 9 are arranged in the pin shaft sleeves 27; the four middle adjusting blocks 6 are arranged in four directions of the parent body 3, eight positioning pins 9 are used for positioning with the bottom surface of the parent body 3 (one surface is provided with two pins), the pin shaft spring 10 is sleeved on the positioning pins 9 and is placed in the parent body 3 and the middle adjusting blocks 6, and the pin shaft spring 10 is in a compressed state; mounting a clamp connecting shaft 8 to ensure that the front direction of the clamp is consistent with the adjusting direction of the centering adjusting device; mounting a clamp connecting shaft 8 and an upper clamp 13, pre-tightening the bolts, and finely adjusting the direction and then screwing the connecting bolts; installing a sample 16 and installing a cover plate 14 (sequentially pre-tightening two opposite bolts to prevent the cover plate 14 from being uneven);
referring to fig. 7, an axonometric view of the mother body 3 is a base body of the whole adjusting device, and another assembling method can be selected, namely, a pin shaft sleeve 27 is firstly installed, then the positioning pins 9 are installed, the two positioning pins 9 are used for positioning and restraining the middle adjusting block 6 (one surface and two pins) with the ground of the mother body 3, then the mother body 3 is installed on the six-dimensional force sensor 1, and the main shaft connecting bolt 12 and the clamp connecting shaft 8 are screwed to complete installation.
The specific working process of the invention is as follows: preparation, the loading chain is assembled first: the electric actuating cylinder 19 is arranged on a frame, is connected with the six-dimensional force sensor 1 through an electric cylinder connecting shaft 23, and is connected with the six-dimensional force sensor 1 and the mounting matrix 3 through a flange connecting clamp; secondly, mounting a rotating platform 26 on the lower platform 24, locking the relative position of the rotating platform 26 and the supporting seat 18, and finally mounting a cover plate 14 of a lower clamp to tightly press the test piece 16; then, assembling all components of the coaxiality adjusting device: the parent body is arranged on the six-dimensional force sensor through six inner hexagon bolts, and two opposite bolts are pre-tightened in sequence (so that the device is prevented from being locked); the thrust ball bearing is arranged in the middle adjusting block, pin shaft sleeves (totally 8) and adjusting shafts (totally 4) in four directions on the parent body are arranged, and pin shafts are arranged in the pin shaft sleeves; installing four middle adjusting blocks in four directions of the parent body, positioning the bottom surface of the parent body by eight pin shafts (one surface is provided with two pins), sleeving the pin shaft springs on the pin shafts, placing the pin shaft springs in the parent body and the middle adjusting blocks, and enabling the pin shaft springs to be in a compressed state; installing a centering ring to enable the front direction of the clamp to be consistent with the adjusting direction of the centering adjusting device; installing a centering ring and a clamp, pre-tightening the bolt, and finely adjusting the direction and then screwing down the connecting bolt; and (4) installing a sample, and installing a clamp cover plate (sequentially pre-tightening two opposite bolts to prevent the cover plate from being uneven).
And (3) carrying out installation and calibration of an adjusting device: adjusting the adjusting shafts in four directions on the matrix of the centering device, checking whether the axial corresponding force values and torques of the adjusting shafts of the six-dimensional force sensor are changed singly, or else, rotating the directions of the rotating table and the centering ring until the axial values of the six-dimensional force sensor corresponding to the four directions of the adjusting shafts are changed singly, and finishing the installation and calibration of the adjusting device.
And (3) carrying out loading calibration of an adjusting device: pre-stretching the test piece, loading in elastic deformation, and recording sensor data; finely adjusting the adjusting shafts in all directions in the loading process, checking the numerical values of the sensors, and rotating the lower rotary table and the centering ring until the variation numerical value of the corresponding fine adjustment direction is less than 5% of the loading force and does not increase along with the loading force; continuously loading until the force value reaches the elastic limit, keeping the bias force within 5 percent of the loading force or keeping the variation value to be small, or collecting the displacement output by the electric actuating cylinder to calculate the corresponding strain and stress to check whether the bias force is within the qualified range; and simulating the loading chain by using abqus simulation software, calculating offset according to the displacement and the direction force value corresponding to the sensor, calculating and distributing the offset to each axial adjustment amount, adjusting the corresponding adjustment shaft, and completing the loading calibration of the adjustment device.
And (5) finishing the adjustment of the coaxiality of the whole machine, and performing formal tensile test.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like of the present invention shall be included in the protection scope of the present invention.
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