CN110726636B - Four-axis centering adjustment system and method for biaxial tensile testing machine - Google Patents

Four-axis centering adjustment system and method for biaxial tensile testing machine Download PDF

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Publication number
CN110726636B
CN110726636B CN201911211413.3A CN201911211413A CN110726636B CN 110726636 B CN110726636 B CN 110726636B CN 201911211413 A CN201911211413 A CN 201911211413A CN 110726636 B CN110726636 B CN 110726636B
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loading
adjusting
centering
sensor
force
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CN110726636A (en
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赵宏伟
孟凡越
张建海
陈俊先
侯伟光
石成玉
赵久成
秦学志
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Jilin University
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Jilin University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/62Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical means
    • G01B5/24Measuring arrangements characterised by the use of mechanical means for measuring angles or tapers; for testing the alignment of axes
    • G01B5/25Measuring arrangements characterised by the use of mechanical means for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
    • G01B5/252Measuring arrangements characterised by the use of mechanical means for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0017Tensile

Abstract

The invention relates to a four-axis centering adjustment system and a four-axis centering adjustment method for a biaxial tensile testing machine, and belongs to the technical field of testing machines. The centering and feedback device 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. Has the advantages that: the adjustment of five degrees of freedom can be realized, and the precision is correspondingly matched with the detection device; the device is connected with the whole machine loading chain, so that the strength of the whole device is improved, the damage to the loading shaft is reduced, the system adaptability is strong, loading chains in different forms and various types of clamps can be matched, the space occupation is small, the operation is simple, the repeated adjustment precision is high, the experiment precision is improved, and the measured data is more accurate.

Description

Four-axis centering adjustment system and method for biaxial tensile testing machine
Technical Field
The invention relates to the technical field of testing machines, in particular to a four-axis centering adjustment system and a four-axis centering adjustment method for a biaxial tensile testing machine. The coaxiality of the loading chain can be calibrated on a testing machine.
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 the testing machine is easy to damage, the precision does not reach the standard, the stability is poor and the like.
Disclosure of Invention
The invention aims to provide a four-axis centering adjustment system and a four-axis centering adjustment method for a biaxial tensile testing machine, which solve the problem that the coaxiality of a loading chain of the conventional biaxial tensile testing machine needs to be adjusted in real time because the loading chain needs to be disassembled, and fill the blank in the prior art to a certain extent. The invention solves the problems that the manual assembly and adjustment precision is not controllable, the adjustment is realized only once, the stability is good, the repeated adjustment is not needed, the reliability is high, the adjustment shaft is indexed, the adjustment amount reaches 0.01mm, the adjustment range is large (plus or minus 0.5 mm), the angular adjustment spherical radius on the matrix reaches the center of a loading test piece, and the adjustment angle can be plus or minus 0.35 degrees; the double-shaft centering sensor is designed, 5 degrees of freedom such as coaxiality, angle and torsion of the loading chain can be identified, the perpendicularity of the two shafts in the orthogonal direction and the planeness formed by the axes can be analyzed, and the detection precision is 0.01 mm; a coarse adjustment device (a support frame and a V-shaped block) is designed, the first coarse adjustment device is used for limiting and preventing the overload of a loading shaft from generating danger, and the second coarse adjustment device is used for roughly adjusting four freedom directions of a loading chain (two freedom degrees of the support frame and two freedom degrees of the V-shaped block) by mounting the support frame and the V-shaped block in a split mode; the centering device and the clamp are connected and combined in a threaded manner, so that the adjustment of five degrees of freedom (two degrees of freedom for mounting an orthogonal plane on a loading chain, two degrees of freedom for rotation and axial rotation of the loading chain) can be realized, and the adjustment of any angle and direction on the loading chain can be realized; a profiling wedge clamp is designed, the clamping area is increased, the clamping mode is adjusted to enable the clamping force of a test piece with the same size to be larger, and the loading force is also larger (the friction force of the traditional wedge and the test piece is changed into the adhesive force of the wedge and the test piece and the strength of a wedge material; the quick-wear parts and the parts with high positioning precision requirements in the adjusting device are designed in a standardized manner, and the important parts adopt the easy-to-machine parts and the standard parts of the rotary parts, so that the loss is reduced, the service life of the device is prolonged, and the rigidity of the whole device is not influenced; the device is connected with a whole machine loading chain, the strength of the whole device is improved, the damage and the deformation to a loading shaft are reduced, meanwhile, the adjusting block is fixedly connected with a parent body, the single loading of the adjusting block is changed into the loading of the whole loading chain, the inner part of the adjusting block is connected by a flange, meanwhile, the centering gap in the loading chain is eliminated, the rigidity of the adjusting device has no influence on the rigidity of the whole machine system, meanwhile, the adjusting module is fixedly connected with the whole machine loading chain, the external force borne by the adjusting device is borne by the whole machine, the strength of the device is improved, and the rigidity of the device is increased by installing the adjusting module on the same parent body, so that the device is more stable and safer in the loading process; the centering device has strong adaptability, is used for installing loading chains with different shaft diameters and matching various types of clamps by adjusting the sizes of the parent body and other parts, has small occupied space, simple operation and high repeated adjustment precision, improves the experimental precision and ensures that the measured data is more accurate.
The above purpose of the invention is realized by the following technical scheme:
a four-axis centering adjustment system for biax tensile testing machine, including main shaft loading chain, centering adjusting device, centering sensor and feedback device, frame, centering adjusting device installs on main shaft loading chain, and main shaft loading chain installs in the frame, detects and feedback mechanism installs and detects and control the adjustment volume in the frame.
The main shaft loading chain is as follows: the electric actuating cylinder 1 is arranged on the supporting block 19, the parent body 2 of the centering adjusting device is in threaded connection with the output shaft of the electric actuating cylinder 1, the angle adjusting shaft 5 of the centering adjusting device is arranged on the parent body 2, the force sensor 9 is arranged on the sensor connecting shaft 7, and the force sensor 9 is positioned on the sensor connecting shaft 7 through a cylindrical pin; the guide shaft 11 is screwed into the force sensor 9, the locking ring 10 is sleeved at the connecting shaft neck of the guide shaft 11, the guide shaft 11 is installed on a guide shaft slide block 22, the guide shaft slide block 22 is installed on a V-shaped block 23, the V-shaped block 23 is installed on a backing plate 24, the backing plate 24 is installed on a support frame 20, the clamp 14 is installed on the pull rod 13 through a pull rod bolt 12, the clamp wedge block 15 is installed on the clamp 14, and the test piece 16 is installed in the clamp 14.
The centering adjusting device is as follows: the matrix 2 is arranged on an output shaft of the electric actuating cylinder through a threaded shaft, the fixing ring 4 is arranged on the matrix 2 through a fixing ring mounting bolt 17, the four angle adjusting bolts 3 are arranged on the fixing ring 4, the angle adjusting shaft 5 is in threaded connection with the matrix 2, the sensor connecting shaft 7 is in threaded connection with the angle adjusting shaft 5 through a threaded output shaft, and the coaxial adjusting bolt 6 is arranged on the angle adjusting shaft 5; the force sensor 9 is installed on the sensor connecting shaft 7 through a sensor connecting bolt 8, the V-shaped block 23 is installed on the support frame 20, and the support frame 20 is installed on the support plate 18.
The centering sensor and the feedback device are as follows: the force sensor 9 is installed on a loading chain, the host and the processor are connected with the force sensor 9 through a USB data line and installed on the rack, the grating ruler on the electric actuating cylinder 1 outputs displacement information to be transmitted to the host, the centering sensor 25 is installed on the loading chain, and the centering sensor 25 is formed by pasting strain rosettes and strain gauges on the test piece 16.
The electric actuating cylinder 1 adopts a folding type electric cylinder CDJ2D16-100Z-M9B-B, and the stroke of the electric cylinder is 100 mm.
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: four supporting blocks 19 are installed on the supporting plate 18, two supporting plates 18 are installed on the four supporting blocks 19, eight supporting frames 20 are installed on the supporting plate 18, the supporting plate 18 is installed on the supporting seat 21, the V-shaped block 23 is installed on the supporting frame 20, and the electric cylinder 1 is installed on the supporting blocks 19.
Another object of the present invention is to provide a four-axis centering adjustment method for a biaxial tensile testing machine, comprising the steps of:
step 1, assembling a frame:
1.1, firstly, placing a support plate 18 on a horizontal assembly platform, cleaning the surface, smearing lubricating grease in a threaded hole, simultaneously placing a support block 19 on the assembly platform, cleaning the installation surface, smearing the lubricating grease in the threaded hole, hoisting the support block 19 by using a crown block, installing the support block 19 on the support plate 18, and leveling;
1.2, mounting a support frame 20 at one side, adjusting the relative position, ensuring that the two support frames 20 are vertical to the axis of the loading chain, mounting a support plate 18 at the other side, screwing in a bolt, leveling, and applying a fixed torque to pre-tighten the bolt according to the loading requirement;
1.3, ensuring that the supporting block 19 is tightly attached to the supporting plate 18, assembling a pin after the installation is smooth, and screwing a bolt after the positioning is finished;
1.4, overturning the platform, installing the other side support plate 18 downwards in the direction of having linked firmly, measuring the parallelism of the upper support plate 18, screwing in the bolt after reaching the standard, installing the other side support frame 20 and screwing in the bolt, adjusting the positions of the two support frames 20 and measuring the verticality with the loading chain, applying a fixed torque pre-tightening bolt according to the loading requirement after reaching the standard, and finishing the assembly of the rack.
Step 2, installing the electric cylinder, inserting the corresponding mark into the corresponding hole position to ensure the accuracy of the installing spigot, and simultaneously applying a fixed torque to pre-tighten the bolt according to the loading requirement to complete the installation of the electric cylinder;
step 3, assembling all parts of the loading chain:
3.1, assembling a centering adjusting device:
3.1.1, placing the matrix 2 on a horizontal table, wiping the mounting surface, smearing lubricating grease on the mounting surface and the matched hole positions, and standing for preparation;
3.1.2, fixing the matrix, placing the angle adjusting shaft 5 in the middle of the matrix 2, aligning the angle adjusting shaft to the mounting hole position, and performing surface calibration leveling on the angle adjusting shaft 5, wherein the angle adjusting shaft is mounted to ensure the parallelism during screwing;
3.1.3, leveling the angle adjusting shaft, then leveling after integral pre-tightening is completed, and finally applying pre-tightening force specified by national standards;
3.1.4, after the installation, keeping the fixation, wiping the installation surface of the matrix 2, smearing lubricating grease on the installation surface and the matching hole positions, and standing for preparation;
3.1.5, mounting a fixing ring 4 on a parent body 2, sequentially screwing two opposite bolts, leveling, pre-tightening every two opposite bolts to finish 6 groups of bolts, leveling, applying pre-tightening force specified by national standards, and screwing an angle adjusting bolt 3;
3.1.6, placing a sensor connecting shaft 7 in the middle of the angle adjusting shaft 5, aligning to a mounting hole position, measuring the levelness of the end face, leveling, rotating the coaxiality adjusting block, detecting the parallelism of the face, screwing down, and screwing in a coaxial adjusting bolt 6;
3.1.7, corresponding the direction of the adjusting bolt of the integral device to the mounting threaded hole;
3.2, installing a sensor:
3.2.1, installing a spigot of a force sensor and sensor connecting shaft 7, ensuring that the two axes are vertical to the end face and are tightly matched, aligning a sensor installing bolt 8, and adding a gasket 24;
3.2.2, wiping the mounting surface, coating lubricating grease on the mounting surface and the matching hole positions, and screwing the sensor connecting bolt 8 on the loading chain by using a torque wrench;
3.2.3, coating lubricating grease on the middle threaded hole, and standing for preparation;
3.3, installing a guide shaft and a locking ring:
3.3.1, placing the assembled centering adjusting device on a horizontal table, installing two locking rings 10 at a guide shaft and connecting a middle threaded shaft of a force sensor 9;
3.3.2, screwing the guide shaft 11 into the force sensor 9, and positioning two end surfaces by using locking rings 10;
3.3.3, the minimum axial distance of the contact surface of the end surfaces of the two locking rings 10 screwed in is to ensure that the guide shaft corresponds to the connection direction of an assembled loading chain, the axial line is coaxial, and the end surfaces are vertical;
step 4, mounting the assembled loading chain:
4.1, hoisting the loading chain by using a crown block to finish the assembly with a spigot of the electric actuating cylinder 1, aligning a bolt mounting hole position and enabling the equipment use adjusting direction to be parallel to the front face of the host, screwing in a bolt, rotating an output shaft of the electric cylinder, adjusting the direction of a parent body to be parallel to the front face of the whole machine, and screwing down the bolt;
4.2, placing the guide shaft on the V-shaped block 23, adjusting the rotation angle of the support frame 20 to enable the guide shaft to be completely attached to the installation surface, and adjusting the position of the V-shaped block 23 on the support frame 20 to enable the guide shaft to be firmly supported by the existing loading chain;
4.3, installing a pull rod 13 and a clamp body 14 to ensure that the clamp faces to be parallel to the positive direction of the whole machine, screwing a bolt into the clamp body and installing the clamp wedge block 15 on the end face of the guide shaft 11;
4.4, placing the test piece 16 on an assembly platform, wiping the surface, and adhering the clamp wedge block 15, the strain gage and the strain gage to the surface in a grouping mode to stand for glue drying;
4.5, inserting the test piece 16 into the clamp wedge block in a 45-degree inclined manner, rotating the test piece 16 by 45 degrees after mounting the clamp wedge block 15, placing the test piece 16 into a mounting groove in the middle of the clamp 14, keeping manual adjustment, placing the test piece at the horizontal positioning baffle plates on the two sides, and completing mounting of the test piece 16;
4.6, adjusting the orientation of the whole loading chain to be consistent with the orientation of the front face of the whole machine, then screwing the bolt, and simultaneously ensuring that the orientation of the clamp is parallel to one of the adjustment directions and the central axis of the test piece 16 is aligned to the axis of the loading chain;
4.7, starting the electric cylinder to pre-tighten the clamp and eliminate the clearance of the loading chain: firstly, the electric cylinder is loaded on the loading chain without clearance, the force value is kept constant or the variation is small, the loading state is kept, the numerical value change of the force sensor 9 in the loading chain stress process is smooth and has no sudden change, then the wrench is inserted into two holes on the side surface of the locking ring 10, the torque is applied by reverse torsion, the locking ring 10 is screwed, then the loading force is kept and then unloaded, the change of the middle force value is smooth, the output displacement of the grating ruler of the electric action cylinder 1 has no play and is linearly increased or decreased, the locking of the loading chain and the installation of the whole machine are completed, and the installation of the loading chain is completed.
Step 5, calibrating the clamping direction of the clamp 14 which is transverse to the whole machine, firstly preloading, reading the indication value of a torsion measurement zone in the middle of the centering sensor 25 by using a strain gauge, calibrating the directions of the two clamps, enabling the directions to correspond to each other, enabling the indication value of the torsion measurement in the middle area of the centering sensor to be a minimum value, and controlling the directions of the two clamps by adjusting the threaded connection length of the clamps; then, calibrating the clamping direction of the clamp 14 with the longitudinal axis, adjusting in the same step, and finally matching the loading chain and the adjusting direction of the four axes with the direction of the whole machine;
Step 6, carrying out coaxiality calibration of the whole machine, firstly adjusting each axial coaxiality and angle of the transverse centering device, observing whether the numerical value of each group of strain gauges on the centering sensor is in single change corresponding to the axial strain numerical value, adjusting the orientation and the screwing-in depth of an output shaft of an electric cylinder to control the orientation of the centering device to be vertical to a loading chain, enabling the orientation to be in one-to-one correspondence with the measuring direction of the centering sensor, adjusting the numerical value to be changed into an extremely small value when the axial strain numerical value is adjusted to be loaded, or adjusting the numerical value to be less than 5% of the loading force and keeping the same, completing installation calibration of the transverse loading chain coaxiality centering device, and then carrying out longitudinal loading coaxiality calibration according to the same steps;
step 7, applying a pulling force to the electric actuating cylinder 1 in the horizontal direction, loading the centering sensor, detecting the axial strain in the horizontal direction to determine the offset direction and the offset amount, firstly roughly adjusting the V-shaped block 23 on the support frame 20 to reduce the numerical variation, adjusting the strain distribution type, adjusting the angle adjusting module to adjust the strain distribution to be in the same direction, having monotonicity, then adjusting the coaxiality, and keeping the numerical deviation to be reduced or keeping the deviation magnitude to be 10-3Continuously loading and checking whether the value coaxial direction changes or the variation is 5% of the loading value, finally completely unloading and carrying out repeated test to finish the centering adjustment of the whole machine in the horizontal direction; then, adjusting the coaxiality of the longitudinal loading chain according to the same steps;
Step 8, adjusting the verticality and the flatness of the composition of two orthogonal loading chains loaded by four shafts, firstly loading the four-axial electric actuating cylinder 1 to simultaneously apply tension, detecting whether the strain values of the four stretching arms are consistent by a loading centering sensor 25, carrying out centering adjustment by adjusting four axial centering adjusting devices, a support frame 20 and a V-shaped block 23, adjusting the strain distribution to be in the same axial direction, ensuring that the strain distribution of two shafts tends to be consistent or has monotonicity, then adjusting two axial directions in the orthogonal direction to ensure that the distribution trends of two shafts in the orthogonal direction tend to be consistent, adjusting each axial coaxiality adjusting shaft to ensure that the strain distribution values of each axial direction are consistent after completing, finally adjusting the coaxiality and keeping the deviation of the values to be reduced or keeping the deviation magnitude to be 10-3Continuously loading and checking whether the value coaxial direction changes or the variation is 5% of the loading value, finally completely unloading and carrying out repeated test to finish the centering adjustment of the whole machine in the horizontal direction; then, adjusting the coaxiality of the longitudinal loading chain according to the same steps;
step 9, pretensioning the centering sensor 9, loading in elastic deformation, keeping the force at 5% of the yield limit, recording the data of the force sensor 9 and the data of the centering sensor, checking the force and the torque in two orthogonal directions vertical to the plane of the loading chain, firstly adjusting the angle adjusting bolt on the spherical surface to reduce the torque in the direction vertical to the loading chain to the minimum value or less than 5% of the loading force without increasing along with the increase of the loading force, then adjusting the coaxiality adjusting direction to make the values of the force sensor and the centering sensor in the two orthogonal directions vertical to the plane of the loading chain to the minimum value or less than 5% of the loading force without increasing along with the increase of the loading force, then keeping the force at 10% and 15% of the yield limit, repeating the steps, and loading the force value to the elastic limit after reaching the standard, the bias force is kept within 5% of the loading force or has small variation, or the displacement output by a grating ruler of the electric actuating cylinder is collected to calculate corresponding strain and stress to check whether the bias force is in a qualified range;
Step 10, simulating a loading chain, calculating displacement offset and angle offset according to the displacement and a direction force value corresponding to the sensor, then calculating adjustment amounts distributed to all the adjusting shafts, adjusting corresponding adjusting bolts, and finally finishing the loading calibration of the whole adjusting device.
The invention has the beneficial effects that:
1. the invention solves the problem that the coaxiality of the loading chain of the existing testing machine needs to be disassembled and the loading chain can not be adjusted in real time, and fills the blank of the prior art to a certain extent.
2. The invention solves the problem that the adjustment precision of manual assembly is not controllable, the adjustment is realized only once, the stability is good, the repeated adjustment is not needed, the reliability is high, the adjustment shaft is indexed, the adjustment amount reaches 0.01mm, the adjustment range is large (plus or minus 0.5 mm), the angular adjustment spherical radius on the matrix reaches the center of a loading test piece, and the adjustment angle can reach plus or minus 0.35 degrees.
3. The four-axis centering adjustment system comprises a double-axis centering sensor, can identify 5 degrees of freedom such as coaxiality, angle and torsion of the loading chain, can analyze perpendicularity of two axes in the orthogonal direction and planeness formed by the axes, and has the detection precision of 0.01 mm.
4. The four-axis centering adjustment system comprises a coarse adjustment device (a support frame and a V-shaped block), wherein the coarse adjustment device is used for limiting to prevent the overload of a loading shaft from generating danger, and the support frame and the V-shaped block are installed in a split mode to coarsely adjust four freedom directions of a loading chain (two freedom degrees of the support frame and two freedom degrees of the V-shaped block).
5. The centering device and the clamp are in threaded connection and combination to realize adjustment of five degrees of freedom (two degrees of freedom of a loading chain installation orthogonal plane, two degrees of freedom of rotation and axial rotation of the loading chain), and adjustment of any angle and direction on the loading chain can be realized.
6. The design of the profiling wedge block clamp increases the clamping area, adjusts the clamping mode to enable the clamping force of a test piece with the same size to be larger, and also enables the loading force to be larger (the friction force of the traditional wedge block and the test piece is changed into the adhesive force of the wedge block and the test piece and the strength of the wedge block material to act together).
7. The quick-wear parts in the adjusting device and the parts with high positioning precision requirements are in standardized design, the important parts adopt the easy-to-machine parts and the standard parts of the rotary parts, the loss is reduced, the service life of the device is prolonged, and the rigidity of the whole device is not influenced.
8. The centering device is connected with the whole machine loading chain, the strength of the whole device is improved, the damage and the deformation to the loading shaft are reduced, meanwhile, the adjusting block is fixedly connected with the parent body, the single loading of the adjusting block is changed into the loading of the whole loading chain, the inner part of the adjusting block is connected by a flange, meanwhile, the centering gap in the loading chain is eliminated, the rigidity of the adjusting device has no influence on the rigidity of the whole machine system, meanwhile, the adjusting module is fixedly connected with the whole machine loading chain, the external force borne by the adjusting device is borne by the whole machine, the strength of the device is improved, and the rigidity of the device is increased by installing the adjusting module on the same parent body, so that the device is more stable and safer in the loading process.
9. The centering device is connected with the loading chain, and the flange connection is adopted to improve the strength and eliminate the gap; the centering 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.
10. The centering device can be matched with various clamps, occupies small space, is simple to operate, has high repeated adjustment precision, and can improve the experimental precision and enable 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 perspective view of a centering sensor mounting shaft of the present invention;
FIG. 2 is an isometric view of a centering sensor of the present invention;
FIG. 3 is an exploded view of the centering adjustment device of the present invention;
FIG. 4 is a cross-sectional view of the centering adjustment device of the present invention;
FIG. 5 is a front view of the centering adjustment device of the present invention;
FIG. 6 is an exploded view of the loading chain of the present invention;
FIG. 7 is an isometric view of the load chain of the present invention;
FIG. 8 is a front view of a four-axis loading chain of the present invention;
FIG. 9 is an exploded isometric view of the wedge profiling fixture of the present invention;
FIG. 10 is an exploded isometric view of the holster of the present invention;
FIG. 11 is a perspective view of the complete machine of the present invention;
FIG. 12 is an exploded view of a coarse tuning device of the present invention;
FIG. 13 is a front view of the complete machine of the present invention;
FIG. 14 is an enlarged partial view of a centering sensor of the present invention.
In the figure: 1. an electrically actuated cylinder; 2. a parent body; 3. an angle adjusting bolt; 4. a fixing ring; 5. an angle adjustment shaft; 6. a coaxial adjusting bolt; 7. a sensor connecting shaft; 8. a sensor connecting bolt; 9. a force sensor; 10. locking a ring; 11. a guide shaft; 12. a pull rod mounting bolt; 13. a pull rod; 14. a clamp; 15. a clamp wedge; 16. a test piece; 17. fixing the ring and installing the bolt; 18. a support plate; 19. a support block; 20. a support frame; 21. a supporting seat; 22. a guide shaft slider; 23. a V-shaped block; 24. a base plate; 25. centering the sensor; 26. and (5) installing a bolt by the electric cylinder.
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 14, the four-axis centering adjustment system and method for the biaxial tensile testing machine of the invention solve the problem that the coaxiality of the loading chain of the existing biaxial 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 adjustment amount reaches 0.01 mm/grid, and the adjustment range is +/-0.5 mm and +/-0.35 degrees; the double-shaft centering sensor can identify 5 degrees of freedom such as coaxiality, angle, torsion and the like of the loading chain, and can analyze the perpendicularity of two shafts in the orthogonal direction and the planeness formed by the axes, and the detection precision is 0.01 mm; the coarse adjustment device can be used for limiting to prevent the overload of the loading shaft from generating danger and can also be used for coarsely adjusting four degrees of freedom of the loading chain; the centering device and the clamp are in threaded connection and combination, so that five degrees of freedom can be adjusted, and the precision is correspondingly matched with that of the detection device; the device is connected with the whole machine loading chain, so that the strength of the whole device is improved, the damage to the loading shaft is reduced, the system adaptability is strong, loading chains in different forms and various types of clamps can be matched, the space occupation is small, the operation is simple, the repeated adjustment precision is high, the experiment precision is improved, and the measured data is more accurate.
Referring to fig. 6 to 8, the four-axis centering adjustment system for the biaxial tensile testing machine of the present invention includes a main shaft loading chain, a centering adjustment device, a centering sensor and a feedback device, and a frame, wherein the centering adjustment device is installed on the main shaft loading chain, the main shaft loading chain is installed on the frame, and a detection and feedback mechanism is installed on the frame for detecting and controlling the adjustment amount.
The main shaft loading chain comprises an electric actuating cylinder 1, an electric cylinder mounting bolt 26, a sensor connecting bolt 8, a force sensor 9, a matrix 2, an angle adjusting shaft 5, a sensor connecting shaft 7, a coaxial adjusting bolt 6, a locking ring 10, a guide shaft 11, a clamp 14, a wedge block 15 and a test piece 16; the electric actuating cylinder 1 is installed on the supporting block 19 through eight electric cylinder installation bolts 26, a parent body 2 of the centering adjusting device is in threaded connection with an output shaft of the electric actuating cylinder 1, an angle adjusting shaft 5 of the centering adjusting device is installed on the parent body 2 through a threaded output shaft, a force sensor 9 is installed on a sensor connecting shaft 7 through 12 sensor connecting bolts 8, and the force sensor 9 is positioned on the sensor connecting shaft 7 through a cylindrical pin; the guide shaft 11 is screwed into the force sensor 9, the locking ring 10 is sleeved on the connecting shaft neck of the guide shaft 11, the guide shaft 11 is arranged on the V-shaped block 23, the clamp 14 is arranged on the guide shaft 11 through a clamp connecting bolt, and the test piece 16 is arranged on the clamp 14.
Referring to fig. 3 to 5, the centering adjustment device includes a base body 2, an angle adjustment bolt 3, an angle adjustment shaft 5, a sensor connection shaft 7, a fixing ring 4, a fixing ring mounting bolt 17, a coaxial adjustment bolt 6, a V-shaped block 23, a support frame 20, and a support plate 18; the device is characterized in that the matrix 2 is arranged on an output shaft of an electric actuating cylinder through a threaded shaft, a fixing ring 4 is arranged on the matrix 2 through a fixing ring mounting bolt 17, four angle adjusting bolts 3 are arranged on the fixing ring 4, an angle adjusting shaft 5 is in threaded connection with the matrix 2, a sensor connecting shaft 7 is connected with the angle adjusting shaft 5 through a threaded output shaft, and a coaxial adjusting bolt 6 is arranged on the angle adjusting shaft 5; the force sensor 9 is installed on the sensor connecting shaft 7 through a sensor connecting bolt 8, the V-shaped block 23 is installed on the support frame 20, and the support frame 20 is installed on the support plate 18.
Referring to fig. 1, 2 and 14, the centering sensor and the feedback device include a force sensor 9, a host, a processor, a centering test piece 16, a strain gauge and an electric cylinder grating scale; the force sensor 9 is installed on a loading chain, the host and the processor are connected with the force sensor 9 through a USB data line and installed on the rack to receive and process data, the grating ruler on the electric actuating cylinder 1 outputs displacement information to be transmitted to the host, the centering sensor 25 is installed on the loading chain, and the centering sensor 25 is formed by attaching strain patterns and strain gauges to the test piece 16.
Referring to fig. 6, the electric actuator 1 adopts a folding type electric cylinder CDJ2D16-100Z-M9B-B, and the stroke of the electric cylinder is 100 mm.
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.
Referring to fig. 10 to 13, the frame includes a supporting block 19, a supporting frame 20, a supporting seat 21, a supporting plate 18, a V-shaped block 23, and supporting legs 27; the four supporting blocks 19 are arranged on the supporting plates 18, the two supporting plates 18 are arranged on the left and right four supporting blocks 19, the eight supporting frames 20 are arranged on the supporting plates 18, the supporting plates 18 are arranged on the supporting seats 21, the V-shaped blocks 23 are arranged on the supporting frames 20, and the electric actuating cylinder 1 is arranged on the supporting blocks 19.
Referring to fig. 1 to 14, the assembly of the complete machine installation and centering adjustment device of the present invention comprises the following steps:
step 1, assembling a frame:
1.1, firstly, placing a support plate 18 on a horizontal assembly platform, cleaning the surface, smearing lubricating grease in a threaded hole, simultaneously placing a support block 19 on the assembly platform, cleaning the installation surface, smearing the lubricating grease in the threaded hole, hoisting the support block 19 by using a crown block, installing the support block 19 on the support plate 18, and leveling;
1.2, mounting a support frame 20 at one side, adjusting the relative position, ensuring that the two support frames 20 are vertical to the axis of the loading chain, mounting a support plate 18 at the other side, screwing in a bolt, leveling, and applying a fixed torque to pre-tighten the bolt according to the loading requirement;
1.3, ensuring that the supporting block 19 is tightly attached to the supporting plate 18, assembling a pin after the supporting block is installed flatly, and screwing a bolt after positioning is finished;
1.4, overturning the platform, installing the other side support plate 18 downwards in the direction of having linked firmly, measuring the parallelism of the upper support plate 18, screwing in the bolt after reaching the standard, installing the other side support frame 20 and screwing in the bolt, adjusting the positions of the two support frames 20 and measuring the verticality with the loading chain, applying a fixed torque pre-tightening bolt according to the loading requirement after reaching the standard, and finishing the assembly of the rack.
Step 2, installing the electric cylinder, inserting the corresponding mark into the corresponding hole position to ensure the accuracy of the installing spigot, and simultaneously applying a fixed torque to pre-tighten the bolt according to the loading requirement to complete the installation of the electric cylinder;
step 3, assembling parts of the loading chain:
3.1, assembling a centering adjusting device:
3.1.1, placing the matrix 2 on a horizontal table, wiping the mounting surface, smearing lubricating grease on the mounting surface and the matched hole positions, and standing for preparation;
3.1.2, fixing the matrix, placing the angle adjusting shaft 5 in the middle of the matrix 2, aligning the angle adjusting shaft to the mounting hole position, and performing surface calibration leveling on the angle adjusting shaft 5, wherein the angle adjusting shaft is mounted to ensure the parallelism during screwing;
3.1.3, leveling the angle adjusting shaft, then carrying out integral pre-tightening, leveling and finally applying pre-tightening force specified by the national standard;
3.1.4, after the installation, keeping the fixation, wiping the installation surface of the matrix 2, smearing lubricating grease on the installation surface and the matching hole positions, and standing for preparation;
3.1.5, mounting the fixing ring 4 on the parent body 2, sequentially screwing two opposite bolts, leveling, pre-tightening every two opposite bolts to complete 6 groups of bolts, leveling, applying pre-tightening force specified by national standards, and screwing in the angle adjusting bolt 3 (the bolt contacts with the surface of the angle connecting shaft);
3.1.6, placing a sensor connecting shaft 7 in the middle of the angle adjusting shaft 5, aligning to a mounting hole position, leveling after measuring the levelness of the end surface, rotating the coaxiality adjusting block, screwing down after detecting the parallelism of the surface, and screwing in a coaxial adjusting bolt 6 (the bolt contacts the surface of the sensor connecting shaft);
3.1.7, corresponding the direction of the adjusting bolt of the integral device to the mounting threaded hole (ensuring the correctness and uniqueness of the adjusting direction);
3.2, installing a sensor:
3.2.1, installing a spigot of a force sensor and sensor connecting shaft 7 to ensure that two axes are vertical to the end face and are tightly matched, aligning a sensor mounting bolt 8, and adding a bolt gasket 24;
3.2.2, wiping the mounting surface, coating lubricating grease on the mounting surface and the matching hole positions, and screwing the sensor connecting bolt 8 on the loading chain by using a torque wrench;
3.2.3, coating lubricating grease on the middle threaded hole, and standing for preparation;
3.3, installing a guide shaft and a locking ring:
3.3.1, placing the assembled centering adjusting device on a horizontal table, installing two locking rings 10 at a guide shaft and connecting a middle threaded shaft of a force sensor 9;
3.3.2, screwing the guide shaft 11 into the force sensor 9, and positioning two end surfaces by using locking rings 10;
3.3.3, the minimum axial distance of the contact surface of the end surfaces of the two locking rings 10 when the locking rings are screwed in is to ensure that the guide shaft corresponds to the connecting direction of an assembled loading chain, the axial lines are coaxial, and the end surfaces are vertical;
step 4, installing the assembled loading chain:
4.1, hoisting the loading chain by using a crown block to finish the assembly with a spigot of the electric actuating cylinder 1, aligning a bolt mounting hole position and enabling the equipment use adjusting direction to be parallel to the front face of the host, screwing in a bolt, rotating an output shaft of the electric cylinder, adjusting the direction of a parent body to be parallel to the front face of the whole machine, and screwing down the bolt;
4.2, placing the guide shaft on the V-shaped block 23, adjusting the rotation angle of the support frame 20 to enable the guide shaft to be completely attached to the installation surface, and adjusting the position of the V-shaped block 23 on the support frame 20 to enable the guide shaft to be firmly supported by the existing loading chain;
4.3, installing a pull rod 13 and a clamp body 14, ensuring that the orientation of the clamp is parallel to the positive direction of the whole machine, screwing a bolt, installing the clamp wedge block 15 on the end surface of the guide shaft 11;
4.4, placing the test piece 16 on an assembly platform, wiping the surface, pasting the clamp wedge block 15, the strain gage and the strain gage on the surface in a grouping mode, standing and waiting for glue drying (preparing a centering sensor);
4.5, inserting the test piece 16 into the clamp wedge block in an inclined way of 45 degrees, rotating the test piece 16 by 45 degrees after installing the clamp wedge block 15, placing the test piece into the middle installation groove of the clamp 14, keeping manual adjustment, placing the test piece at the horizontal positioning baffle plates at the two sides, and completing the installation of the test piece 16;
4.6, adjusting the orientation of the whole loading chain to be consistent with the orientation of the front face of the whole machine, then screwing the bolt, and simultaneously ensuring that the orientation of the clamp is parallel to one of the adjustment directions and the central axis of the test piece 16 is aligned to the axis of the loading chain;
4.7, opening the electric cylinder to pre-tighten the clamp and eliminate the clearance of the loading chain: firstly, the electric cylinder is loaded on a loading chain without a gap (the force value is kept unchanged or the variation amount is small) to keep a loading state, the numerical value change of the force sensor 9 in the process of loading the loading chain is smooth and has no sudden change, then a wrench is inserted into two holes on the side surface of the locking ring 10 to reversely twist and apply torque, the locking ring 10 is screwed, then the loading force is kept and then the loading is unloaded, the change of the middle force value is smooth, the output displacement of the grating ruler of the electric actuating cylinder 1 has no play and is linearly increased or decreased, the locking of the loading chain and the installation of the whole machine are completed, and the installation of the loading chain is completed.
Step 5, calibrating the clamping direction of the transverse clamp 14 of the whole machine, firstly preloading, reading the indication value of the middle measurement torsion area of the centering sensor 25 by using a strain gauge, calibrating the directions of the two clamps, and enabling the directions to correspond to each other, so that the indication value of the torsion measurement of the middle area of the centering sensor is a minimum value (the directions of the two clamps are controlled by adjusting the threaded connection length of the clamps); then, calibrating the clamping direction of the clamp 14 with the longitudinal axis, adjusting in the same step, and finally matching the loading chain and the adjusting direction of the four axes with the direction of the whole machine;
step 6, carrying out coaxiality calibration of the whole machine, firstly adjusting each axial coaxiality and angle of the transverse centering device, observing whether the numerical value of each group of strain gauges on the centering sensor is in single change corresponding to the axial strain numerical value, adjusting the orientation and the screwing-in depth of an output shaft of an electric cylinder to control the orientation of the centering device to be vertical to a loading chain, enabling the orientation to be in one-to-one correspondence with the measuring direction of the centering sensor, adjusting the numerical value to be changed into an extremely small value (or less than 5% of the loading force and keeping unchanged) when the loading is carried out, completing the installation calibration of the transverse loading chain coaxiality centering device, and then carrying out longitudinal loading coaxiality calibration according to the same steps;
Step 7, the electric actuating cylinder 1 in the horizontal direction applies a pulling force, the centering sensor is loaded, the axial strain in the horizontal direction is detected to determine the offset direction and the offset amount, firstly, the V-shaped block 23 on the support frame 20 is roughly adjusted,the variation of the numerical value is reduced, the strain distribution type is adjusted, the angle adjusting module is adjusted, the strain distribution is adjusted to be in the same direction, the monotonicity is realized, (one end is screwed in to the same depth while the other end is correspondingly screwed out to the same depth during adjustment, the overload damage or deformation of the part is prevented), the coaxiality is adjusted again, and the deviation of the numerical value is reduced or the deviation magnitude is 10-3Continuously loading and checking whether the value is changed in the same axial direction or the variation is 5% of the value of the loading amount, finally carrying out complete unloading and carrying out repeated test (firstly, adjusting the loading chain on one side, after the stretching reaches the standard, if the loading chain on the other side is not required to be adjusted for a plurality of times until the repeated test reaches the standard after unloading), and finishing the centering adjustment in the horizontal direction of the whole machine; then, adjusting the coaxiality of the longitudinal loading chain according to the same steps;
step 8, adjusting the verticality and the flatness of the composition of the two orthogonal loading chains loaded by the four shafts, firstly loading the four-axial electric actuating cylinder 1 and simultaneously applying a pulling force, detecting whether the strain values of the four stretching arms are consistent by the loading centering sensor 25, the strain distribution is adjusted to be in the same axial direction by adjusting four axial centering adjusting devices, the support frame 20 and the V-shaped block 23 to perform centering adjustment (mainly an angle adjusting shaft), the strain distribution of the two shafts tends to be consistent or has monotonicity, then adjusting two axial directions in the orthogonal direction to enable the distribution trends of the two axial directions in the orthogonal direction to tend to be consistent, adjusting the coaxiality adjusting shafts in all the axial directions after finishing adjustment to ensure that the strain distribution values in all the axial directions are consistent (one end is screwed in to the depth and the other end is correspondingly screwed out to the same depth to prevent parts from being damaged or deformed in an overload mode), and finally adjusting the coaxiality and keeping the values with reduced deviation or 10-degree deviation. -3Continuously loading and checking whether the number value is changed in the same axial direction or the variation is 5% of the loading value, finally completely unloading and carrying out repeated tests (firstly, adjusting the loading chain on one side, after stretching to reach the standard, if the loading chain on the other side does not reach the standard for multiple times, adjusting the loading chain on the other side until the repeated tests reach the standard after unloading), and finishing the centering adjustment in the horizontal direction of the whole machine; then, adjusting the coaxiality of the longitudinal loading chain according to the same steps;
step 9, pretensioning the centering sensor 9, loading in elastic deformation, keeping the force at 5% of the yield limit, recording the data of the force sensor 9 and the data of the centering sensor, checking the force and the torque in two orthogonal directions vertical to the plane of the loading chain, firstly adjusting the angle adjusting bolt on the spherical surface to reduce the torque in the direction vertical to the loading chain to the minimum value (or less than 5% of the loading force) and not increase along with the increase of the loading force, then adjusting the coaxiality adjusting direction to make the values of the force sensor and the centering sensor in the two orthogonal directions vertical to the plane of the loading chain be the minimum value (or less than 5% of the loading force) and not increase along with the increase of the loading force, then keeping the force at 10% and 15% of the yield limit, repeating the above steps, and loading the force value to the elastic limit after reaching the standard, the bias force is kept within 5% of the loading force or the variation is very small, or the displacement output by a grating ruler of the electric actuating cylinder is collected to calculate corresponding strain and stress to check whether the bias force is in a qualified range;
Step 10, simulating a loading chain by using abqus simulation software, calculating displacement offset and angle offset according to the displacement and the direction force value corresponding to the sensor, then calculating adjustment values distributed to each adjusting shaft, adjusting corresponding adjusting bolts, and finally finishing the loading calibration of the whole adjusting device.
And finishing the loading and calibration of the whole machine adjusting device, and carrying out 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 to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made to the present invention shall fall within the protection scope of the present invention.

Claims (5)

1. The utility model provides a four-axis centering adjustment system for biax tensile testing machine which characterized in that: the centering and adjusting device 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 to detect and control the adjustment amount;
the main shaft loading chain is as follows: the electric actuating cylinder (1) is installed on the supporting block (19), a parent body (2) of the centering adjusting device is in threaded connection with an output shaft of the electric actuating cylinder (1), an angle adjusting shaft (5) of the centering adjusting device is installed on the parent body (2), the force sensor (9) is installed on the sensor connecting shaft (7), and the force sensor (9) is positioned on the sensor connecting shaft (7) through a cylindrical pin; a guide shaft (11) is screwed into the force sensor (9), a locking ring (10) is sleeved at the connecting shaft neck of the guide shaft (11), the guide shaft (11) is installed on a guide shaft sliding block (22), the guide shaft sliding block (22) is installed on a V-shaped block (23), the V-shaped block (23) is installed on a base plate (24), the base plate (24) is installed on a supporting frame (20), a clamp (14) is installed on a pull rod (13) through a pull rod bolt (12), a clamp wedge block (15) is installed on the clamp (14), and a test piece (16) is installed in the clamp (14);
The centering adjusting device is as follows: the sensor comprises a parent body (2), a fixing ring (4), four angle adjusting bolts (3), an angle adjusting shaft (5), a sensor connecting shaft (7), a coaxial adjusting bolt (6), a sensor fixing shaft (2), a sensor fixing shaft (6) and a sensor fixing shaft (2), wherein the parent body (2) is installed on an output shaft of an electric actuating cylinder through a threaded shaft; the force sensor (9) is installed on the sensor connecting shaft (7) through a sensor connecting bolt (8), the V-shaped block (23) is installed on the supporting frame (20), and the supporting frame (20) is installed on the supporting plate (18).
2. The four-axis centering adjustment system for biaxial tensile testing machine according to claim 1, characterized in that: the centering sensor and the feedback device are as follows: the force sensor (9) is installed on a loading chain, the host and the processor are connected with the force sensor (9) through a USB data line and installed on a rack, the grating ruler on the electric actuating cylinder (1) outputs displacement information to be transmitted to the host, the centering sensor (25) is installed on the loading chain, and the centering sensor (25) is formed by attaching strain patterns and strain gauges to a test piece (16).
3. The four-axis centering adjustment system for biaxial tensile testing machines according to claim 1 or 2, characterized in that: the electric actuating cylinder (1) adopts a folding type electric cylinder CDJ2D16-100Z-M9B-B, and the stroke of the electric cylinder is 100 mm.
4. The four-axis centering adjustment system for biaxial tensile testing machine according to claim 1, characterized in that: the frame is as follows: four supporting blocks (19) are arranged on a supporting plate (18), eight supporting frames (20) are arranged on the supporting plate (18), the supporting plate (18) is arranged on a supporting seat (21), a V-shaped block (23) is arranged on the supporting frame (20), and an electric actuating cylinder (1) is arranged on the supporting blocks (19).
5. A four-axis centering adjustment method for a biaxial tensile testing machine is characterized by comprising the following steps: the method comprises the following steps:
step (1), assembling a rack:
step (2), installing an electric cylinder, inserting the corresponding mark into the corresponding hole position to ensure the accuracy of the installing spigot, and simultaneously applying a fixed torque to pre-tighten the bolt according to the loading requirement to complete the installation of the electric cylinder;
step (3), assembling parts of the loading chain:
3.1, assembling a centering adjusting device;
3.2, installing a sensor;
3.3, installing a guide shaft and a locking ring;
Step (4), installing the assembled loading chain:
step (5), calibrating the clamping direction of a clamp (14) which is transverse to the whole machine, firstly preloading, reading the indication value of a middle measurement torsion area of a centering sensor (25) by using a strain gauge, calibrating the directions of the two clamps, corresponding the directions, enabling the indication value of the torsion measurement area in the middle area of the centering sensor to be a minimum value, and controlling the directions of the two clamps by adjusting the threaded connection length of the clamps; then, calibrating the clamping direction of a clamp (14) with a longitudinal shaft, adjusting in the same step, and finally matching the loading chains and the adjusting direction of the four shafts with the direction of the whole machine;
step (6), carrying out coaxiality calibration of the whole machine, firstly adjusting each axial coaxiality and angle of the transverse centering device, observing whether the numerical value of each group of strain gauges on the centering sensor is in single change corresponding to the axial strain numerical value, adjusting the orientation and the screwing-in depth of an output shaft of an electric cylinder to control the orientation of the centering device to be vertical to a loading chain, enabling the orientation to be in one-to-one correspondence with the measuring direction of the centering sensor, adjusting the numerical value to be changed into an extremely small value when the axial strain numerical value is adjusted to be loaded, or being less than 5% of the loading force and keeping the axial strain value unchanged, completing installation calibration of the transverse loading chain coaxiality centering device, and then carrying out longitudinal loading coaxiality calibration according to the same steps;
Step (7), applying a pulling force on the electric actuating cylinder (1) in the horizontal direction, loading a centering sensor, detecting the axial strain in the horizontal direction to determine the offset direction and the offset, firstly roughly adjusting a V-shaped block (23) on a support frame (20) to reduce the numerical variation, adjusting an angle adjusting module to adjust the strain distribution to be in the same direction and have monotonicity, then adjusting the coaxiality and keeping the numerical deviation to be reduced or keeping the deviation magnitude to be 10-3Continuously loading and checking whether the value coaxial direction changes or the variation is 5% of the loading value, finally completely unloading and carrying out repeated test to finish the centering adjustment of the whole machine in the horizontal direction; then, adjusting the coaxiality of the longitudinal loading chain according to the same steps;
step (8), adjusting the verticality and the flatness of the composition of two orthogonal loading chains loaded by four shafts, firstly loading the four-axial electric actuating cylinder (1) to simultaneously apply tension, detecting whether the strain values of the four stretching arms are consistent by a loading centering sensor (25), carrying out centering adjustment by adjusting four-axial centering adjusting devices, a support frame (20) and a V-shaped block (23), adjusting the strain distribution to be in the same axial direction, wherein the strain distributions of two shafts tend to be consistent or have monotonicity, and then adjusting two axial directions in the orthogonal direction to divide the two-shaft distribution in the orthogonal direction The distribution trends tend to be consistent, the coaxiality adjusting shafts in all axial directions are adjusted after the distribution trends tend to be consistent, the strain distribution numerical values in all axial directions are guaranteed to be consistent, and finally the coaxiality is adjusted, and the deviation of the numerical values is kept to be reduced or the deviation magnitude is 10-3Continuously loading and checking whether the value coaxial direction changes or the variation is 5% of the loading value, finally completely unloading and carrying out repeated test to finish the centering adjustment of the whole machine in the horizontal direction; then, adjusting the coaxiality of the longitudinal loading chain according to the same steps;
step (9), pretensioning the centering sensor (9), loading in elastic deformation, keeping the force under a force value of 5% of the yield limit, recording the data of the force sensor (9) and the data of the centering sensor, checking the force and the torque in two orthogonal directions vertical to the plane of the loading chain, firstly adjusting an angle adjusting bolt on a spherical surface to reduce the torque in the direction vertical to the loading chain to an extremely small value or less than 5% of the loading force and not increase along with the increase of the loading force, then adjusting the coaxiality adjusting direction to ensure that the values in the two orthogonal directions vertical to the plane of the loading chain of the values of the force sensor and the centering sensor are extremely small values or less than 5% of the loading force and not increase along with the increase of the loading force, then keeping the force under a force value of 10% and 15% of the yield limit, repeating the steps, and after reaching the standard, loading a force value to an elastic limit, keeping the bias force within 5% of the loading force or keeping the variation to be small, or acquiring the displacement output by a grating ruler of the electric actuating cylinder to calculate corresponding strain and stress to check whether the bias force is in a qualified range;
And (10) simulating the loading chain, calculating displacement offset and angle offset according to the displacement and the corresponding direction force value of the sensor, then calculating the adjustment amount distributed to each adjusting shaft, adjusting the corresponding adjusting bolt, and finally finishing the loading calibration of the whole machine adjusting device.
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