CN113295516A - Centering device and application thereof in bending mechanical property test - Google Patents
Centering device and application thereof in bending mechanical property test Download PDFInfo
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- CN113295516A CN113295516A CN202110740084.2A CN202110740084A CN113295516A CN 113295516 A CN113295516 A CN 113295516A CN 202110740084 A CN202110740084 A CN 202110740084A CN 113295516 A CN113295516 A CN 113295516A
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- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 238000005452 bending Methods 0.000 title claims abstract description 52
- 230000000712 assembly Effects 0.000 claims abstract description 13
- 238000000429 assembly Methods 0.000 claims abstract description 13
- 230000000670 limiting effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 238000013001 point bending Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000004154 testing of material Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0605—Mechanical indicating, recording or sensing means
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Abstract
The invention discloses a centering device and application thereof in bending mechanical property tests, comprising a machine body and a supporting component, wherein the middle part of the machine body is detachably provided with a centering component, the centering component comprises a positioning base, the top end of the positioning base is slidably provided with a centering block for adjusting a sample, and the positioning base is fixedly connected with a scale for marking the position of the centering block; the supporting components are symmetrically and fixedly arranged on the machine bodies positioned on two sides of the positioning base, and clamping components used for fixing the sample are arranged on the supporting components. When the centering block is used, the distance between the side wall of one side of the centering block and the longitudinal axis of the machine body is adjusted to be half of the width or the diameter of a sample, the sample is horizontally placed to be attached to the side wall of the centering block, two ends of the sample are supported on the supporting assembly, and the center line of the sample is aligned with the longitudinal axis of the machine body; the clamping assembly is adjusted to clamp the sample, so that the sample is horizontally fixed at the central positions of the two groups of supporting assemblies, the centering assembly is taken out to perform a bending mechanical property test, and the accuracy of a test result is ensured.
Description
Technical Field
The invention relates to the technical field of test detection devices, in particular to a centering device and application thereof in bending mechanical property tests.
Background
At present, a three-point bending test is often adopted when testing mechanical performance indexes such as bending mechanical performance, fracture toughness and the like of metal materials and non-metal materials. The three-point bending test is that a strip-shaped sample is flatly placed in a bending test fixture to form a simple beam form, the distance between two lower supporting points for supporting the sample is adjustable according to the length of the sample, a loading point is arranged above the sample, three-point bending occurs when three contact points form two equal moments, and the sample is broken at the middle point.
When a three-point bending test is carried out, a sample is simply placed on the two support rollers of the bending test fixture, and the sample is difficult to be horizontally placed at the central positions of the two support rollers, so that the sample cannot be determined to be perpendicular to a bending test pressure head, and the test result of the mechanical property bending test is influenced.
Disclosure of Invention
In order to solve the technical problems existing in the background technology, the application provides a centering device and application thereof in bending mechanical property tests.
The centering device comprises a machine body and a supporting assembly, wherein the centering assembly is detachably mounted in the middle of the machine body and comprises a positioning base, a centering block for adjusting a sample is slidably arranged at the top end of the positioning base, and a scale for marking the position of the centering block is fixedly connected to the positioning base; the supporting components are symmetrically and fixedly arranged on the machine bodies on two sides of the positioning base, and clamping components used for fixing samples are arranged on the supporting components.
By adopting the technical scheme, when the centering device is used, the positioning base is arranged on the machine body, the side wall of one side of the centering block is aligned with the longitudinal axis of the machine body, and then the centering block is slid, so that the side wall aligned with the longitudinal axis of the machine body moves by a distance which is half of the width or the diameter of a sample; and then horizontally placing the sample on a positioning base, enabling two ends of the sample to be respectively supported on two supporting assemblies, attaching the side wall in the middle of the sample to the side wall of the centering block deviating from the longitudinal axis of the machine body by half of the width or diameter of the sample, aligning the center line of the sample with the longitudinal axis of the machine body, adjusting the clamping assemblies to enable the clamping assemblies to clamp the sample, horizontally fixing the sample at the central positions of the two groups of supporting assemblies, and finally taking out the centering assemblies to perform a bending mechanical property test, thereby ensuring the bending mechanical property test result.
Preferably, the supporting component comprises a roller base connected with the machine body, a supporting roller support is detachably mounted at the top end of the roller base, and the top end face of the supporting roller support is a circular convex table face.
By adopting the technical scheme, when the sample is placed on the supporting roller support, the bottom surfaces of the two ends of the sample are pressed on the top end surface of the circular boss; because the supporting roller support is detachably arranged on the roller base, the supporting roller support with the circular convex table top with different radiuses can be replaced for performance tests with different bending radiuses, test auxiliary tools with different bending radiuses do not need to be purchased, and equipment cost is effectively reduced.
Preferably, two the relative lateral wall of roller base has all seted up spacing blind hole, the rigid coupling has the seat cover piece with spacing blind hole grafting cooperation on the bearing of bearing.
Through adopting above-mentioned technical scheme, prop and roll the support and install in the spacing blind hole of roller base through the seat cover piece, carrying out the performance test, the pushing down of sample is used and is easily leaded to a roll support and outwards remove, and spacing blind hole seted up on two roller base relative lateral walls this moment has the restriction effect to a roll support, has prevented effectively that a roll support from sliding to both sides, has improved supporting component's stability among the test process, and then has improved the reliability of result.
Preferably, the limiting blind hole and the seat sleeve block are both trapezoidal, and arc corners are arranged at the corner positions of the limiting blind hole and the seat sleeve block.
By adopting the technical scheme, the trapezoidal limiting blind hole limits the supporting roller support on the roller base through the seat sleeve block, so that the possibility of shaking of the supporting roller support is reduced, and the connection stability of the supporting roller support and the roller base is improved; the arc corner overcomes the defect of stress concentration caused by the sharp corner, is beneficial to prolonging the service life of the roller base, and is easier to process relative to the sharp corner.
Preferably, the clamping assembly comprises two clamping blocks and a threaded piece, the two clamping blocks are slidably arranged at the top end of the supporting assembly, the threaded piece is in threaded connection with the clamping blocks, the two clamping blocks synchronously move towards or away from each other, and the clamping blocks are symmetrically arranged on two sides of the central axis of the supporting assembly.
Through adopting above-mentioned technical scheme, after placing the sample, rotate the screw thread spare and make two press from both sides tight piece and all be close to the sample and remove, press from both sides tight piece and press from both sides tight sample until pressing from both sides tight piece, can fix the sample on the back-off roll support, prevent carrying out the experimental in-process of crooked mechanical properties, the pushing down of bending resistance pressure head makes the sample skew, has further improved the accuracy of test result.
Preferably, a trapezoidal groove is formed in the platform surface at the top end of the supporting assembly, a trapezoidal block is fixedly connected to the lower portion of the clamping block, the trapezoidal block is slidably arranged in the trapezoidal groove, and the threaded part is rotatably arranged in the trapezoidal groove and is in threaded connection with the trapezoidal block; the end part of the threaded part penetrates out of the supporting component and then is fixedly connected with a butterfly knob.
By adopting the technical scheme, the clamping block is connected with the supporting roller support through the trapezoidal block, and the trapezoidal groove has a limiting effect on the trapezoidal block, so that the connection stability of the clamping block and the supporting roller support is improved, the clamping block is prevented from shaking or separating from the supporting roller support, and the clamping and fixing effects of the clamping assembly are further ensured; the user can rotate the screw thread piece by holding the butterfly knob with the hand, so that the clamping assembly is convenient to adjust.
Preferably, a T-shaped stop block is mounted on the centering block.
Through adopting above-mentioned technical scheme, if the crooked breach of taking of sample, when arranging the sample in the location base on, T shape dog card is in the breach department of sample, prevents that the sample from rolling the longitudinal axis of skew organism to the stability when crooked breach sample of taking is placed has been ensured.
Preferably, the machine body is provided with a pin hole, and the positioning base is fixedly connected with a pin head which is in plug-in fit with the pin hole.
Through adopting above-mentioned technical scheme, when the installation location base, insert the round pin head in the pinhole, the restriction of pinhole to the round pin head makes location base fix on the organism, simple structure, simple to operate.
The application of centering device in crooked mechanical properties is experimental that this application provided, crooked mechanical properties is experimental to be gone on the testing machine of installing the bending resistance pressure head.
By adopting the technical scheme, when the bending mechanical property test is carried out, the machine body and the bending resistance pressure head are installed on the testing machine, and in the testing process, the testing machine is utilized to push the bending resistance pressure head downwards so as to realize the vertical downward movement of the bending resistance pressure head.
Preferably, the bending mechanical property test specifically comprises the following steps:
(1) installing the machine body provided with the supporting component and the bending-resistant pressure head matched with the roller base on the testing machine, and enabling the bending-resistant pressure head to be positioned right above the middle part of the machine body;
(2) mounting the centering assembly on the machine body, and adjusting the centering block to enable the distance L between the side wall of the centering block and the longitudinal axis of the machine body to be half of the width or the diameter of the sample;
(3) placing a sample to enable two ends of the sample to be supported on the top surfaces of the two supporting assemblies respectively, and adjusting the sample to enable the side wall of the middle of the sample to be attached to the side wall of the centering block, which deviates from the longitudinal axis of the machine body by the distance L;
(4) adjusting the clamping assembly to clamp and fix the sample from two sides of the sample;
(5) and drawing out the centering assembly, and adjusting the testing machine to enable the bending resistance pressure head to be pressed down on the top surface of the middle part of the sample, so that the bending mechanical property test can be carried out.
By adopting the technical scheme, when a sample is placed, the centering assembly enables the center line of the sample to be aligned with the longitudinal axis of the machine body; after the centering assembly is pulled out, the centering effect of the sample is ensured by the fixing action of the clamping assembly; in the process of carrying out the bending mechanical property test, the supporting component is supported by two ends of the sample, the bending pressure head is pressed down by the middle part of the sample, and at the moment, three stable contact points form two equal moments, so that the sample is bent at three points, and the bending mechanical property test can be carried out.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the centering block is used, the distance between the side wall of one side of the centering block and the longitudinal axis of the machine body is adjusted to be half of the width or the diameter of a sample, the sample is horizontally placed to be attached to the side wall of the centering block, two ends of the sample are supported on the supporting assembly, and the center line of the sample is aligned with the longitudinal axis of the machine body; the clamping assembly is adjusted to clamp the sample, so that the sample is horizontally fixed at the central positions of the two groups of supporting assemblies, and the centering assembly is taken out to perform a bending mechanical property test, thereby ensuring the accuracy of the test result;
2. for performance tests with different bending radius requirements, the supporting roller support of the circular convex table top with different radius can be replaced, test aids with different bending radius do not need to be purchased, and cost is effectively reduced;
3. after the sample was placed to this application, rotate the screw member and make two tight samples of clamp block clamp, can fix the sample on the back roll support, prevent that the bending resistance pressure head from pushing down and make the sample skew, further improve the accuracy of test result.
Drawings
Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present application.
Fig. 2 is a schematic structural diagram of the body in embodiment 1 of the present application.
Fig. 3 is a schematic structural view of a roller base in embodiment 1 of the present application.
Fig. 4 is a schematic structural view of a support roller in embodiment 1 of the present application.
Fig. 5 is a cross-sectional view taken along line a-a of fig. 4.
Fig. 6 is a schematic structural diagram of a centering assembly in embodiment 1 of the present application.
Fig. 7 is a view taken along direction B in fig. 6.
Fig. 8 is a graph showing a bending mechanical property test performed by using example 1 of the present application.
Fig. 9 is a schematic view of the overall structure of embodiment 2 of the present application.
Description of reference numerals: 1. a body; 11. an adjustment groove; 12. a pin hole; 2. a support assembly; 21. a roller base; 211. a mounting seat; 212. a limiting blind hole; 213. a circular arc corner; 22. a supporting roller support; 221. a seat sleeve block; 222. a circular boss; 223. a trapezoidal groove; 3. a centering assembly; 31. a positioning base; 311. a pin head; 32. centering blocks; 33. a scale; 34. a T-shaped stop block; 4. a clamping assembly; 41. a clamping block; 411. a trapezoidal block; 42. a support plate; 43. a threaded member; 431. a butterfly knob; 5. a bending-resistant pressure head; 6. and (4) sampling.
Detailed Description
The present application is described in further detail below with reference to figures 1-9.
EXAMPLE 1
The embodiment of the application discloses a centering device and application thereof in bending mechanical property tests. Referring to fig. 1, the centering device includes a body 1, a support assembly 2, a centering assembly 3, and a clamping assembly 4. The machine body 1 is in a rectangular block shape and is horizontally placed on a testing machine, and the testing machine is an existing universal material testing machine. Referring to fig. 2, an adjusting groove 11 is formed on the top surface of the machine body 1, the length direction of the adjusting groove 11 is the same as the length direction of the machine body 1, and the cross section of the adjusting groove 11 is in the shape of an isosceles trapezoid. The side wall of the middle part of the machine body 1 is provided with a pin hole 12, the cross section of the upper part of the pin hole 12 is rectangular, and the cross section of the lower part of the pin hole 12 is circular.
Referring to fig. 1, the support assembly 2 includes a roller base 21 and a roller support 22. The roller base 21 has a right-angled trapezoidal cross section and is supported on the top surface of the machine body 1. Referring to fig. 3, a limiting blind hole 212 is formed in a side wall of the roller base 21 near the middle of the machine body 1, an opening of the limiting blind hole 212 is trapezoidal, and a top end of the limiting blind hole is communicated with a top surface of the roller base 21. The roller base 21 is integrally formed with a mounting seat 211 on the bottom surface thereof, and the cross section of the mounting seat 211 is in the shape of an isosceles trapezoid and is disposed in the adjustment groove 11 and attached to the inner wall of the adjustment groove 11.
Referring to fig. 4 and 5, the roller support 22 is a rectangular block, a seat cover block 221 is integrally formed on the bottom surface of the roller support, and the seat cover block 221 is a trapezoidal block and is located on one side of the roller support 22 close to the middle of the machine body 1. As shown in fig. 1, the seat sleeve block 221 is inserted into and fitted with the blind limiting hole 212, so as to fix the roller support 22 on the roller base 21, thereby realizing the detachable connection between the roller support 22 and the roller base 21. The corner positions of the limiting blind hole 212 and the seat sleeve block 221 are provided with arc corners 213, so that the defect of stress concentration caused by sharp corners is overcome, and the service life of the roller base 21 is prolonged.
Referring to fig. 4 and 5, a circular boss 222 is integrally formed on one side of the top end of the support roller 22, and the cross section of the circular boss 222 is semicircular, and the length direction of the circular boss is consistent with the length direction of the support roller 22. The platform surface at the top end of the supporting roller support 22 is provided with a trapezoidal groove 223, the cross section of the trapezoidal groove 223 is isosceles trapezoid, and the length direction of the trapezoidal groove is consistent with the length direction of the supporting roller support 22.
Referring to fig. 1, the support members 2 are provided in two sets, and the two sets of support members 2 are symmetrically arranged about a transverse axis of the machine body 1. When the test piece 6 is placed on the test aid, the bottom surfaces of both ends of the test piece 6 are supported on the top end surfaces of the two circular bosses 222, respectively. Because the supporting roller support 22 is detachably connected with the roller base 21, the supporting roller support 22 with the circular bosses 222 with different radiuses can be replaced for performance tests with different bending radiuses, and the equipment cost is reduced.
Referring to fig. 1, the centering assembly 3 includes a positioning base 31, a centering block 32, and a scale 33. The positioning base 31 is rectangular block-shaped, and the longitudinal direction thereof coincides with the width direction of the machine body 1. As shown in fig. 6 and 7, a pin head 311 is fixedly connected to the bottom surface of the positioning base 31, the cross section of the upper portion of the pin head 311 is rectangular, the cross section of the lower portion of the pin head 311 is circular, and the pin head 311 is inserted into and matched with the pin hole 12, so that the positioning base 31 and the machine body 1 are detachable. When the pin head 311 is inserted into the pin hole 12, the positioning base 31 can be fixed on the machine body 1, the structure is simple, the installation is convenient, and the supporting components 2 are symmetrically arranged on two sides of the positioning base 31.
Referring to fig. 1, the scale 33 is fixedly attached to the side wall of the positioning base 31, and the length direction thereof coincides with the length direction of the positioning base 31, and the center line thereof is aligned with the longitudinal axis of the machine body 1. The top end of the positioning base 31 is provided with a centering block 32 in a sliding manner, and the centering block 32 is rectangular in block shape. As shown in fig. 7, a sliding groove is formed in the bottom surface of the centering block 32, the cross section of the sliding groove is a semicircular arc, the top end surface of the positioning base 31 is a semicircular arc surface protruding upward, and the top end of the positioning base 31 extends into the sliding groove and is attached to the inner wall of the sliding groove.
Referring to fig. 1, the clamping assembly 4 includes a clamping block 41, a support plate 42, and a screw 43. The clamping block 41 is a rectangular block, and is slidably disposed on the platform surface at the top of the roller support 22, and the top end surface of the clamping block is higher than the top end surface of the circular boss 222. As shown in fig. 4 and 5, a trapezoidal block 411 is integrally formed at the bottom of the clamping block 41, and the cross section of the trapezoidal block 411 is trapezoidal and is slidably disposed in the trapezoidal groove 223. The support plate 42 is an isosceles trapezoid that is fixedly disposed within the trapezoid groove 223. The screw 43 is rotatably arranged in the trapezoidal groove 223, one end of the screw is rotatably connected with the support plate 42, the other end of the screw penetrates through the trapezoidal block 411 and then penetrates out of the support roller 22, the screw 43 is in threaded connection with the trapezoidal block 411, and a butterfly knob 431 is fixedly connected to one end of the screw 43 penetrating out of the support roller 22. The clamping assemblies 4 are provided with two groups, and the two groups of clamping assemblies 4 are arranged on two sides of the central axis of the supporting roller support 22.
With reference to fig. 1 and 8, the application of the centering device in the bending mechanical property test is performed on a testing machine equipped with a bending resistance head 5, and specifically includes the following steps:
(1) the machine body provided with the supporting component 2 and the bending resistance pressure head 5 matched with the roller base 21 are both arranged on the testing machine, so that the bending resistance pressure head 5 is positioned right above the middle part of the machine body 1.
(2) The centering assembly 3 is mounted on the machine body 1 and the centering block 32 is adjusted so that its side wall is aligned with the longitudinal axis of the machine body 1, and then the centering block 32 is slid according to the width of the sample 6 so that the distance L between the side wall of the centering block 32 and the longitudinal axis of the machine body 1 is half the width or diameter of the sample 6.
(3) Then placing the sample 6, and enabling two ends of the sample 6 to be respectively supported on the top surfaces of the two supporting components 2; and the sample 6 is adjusted to fit the middle side wall of the sample 6 with the side wall of the centering block 32 deviating from the longitudinal axis of the machine body by the distance L, so that the center line of the sample 6 can be aligned with the longitudinal axis of the machine body 1, and the sample 6 is horizontally placed in the center position of the two groups of support assemblies 2 in the length direction.
(4) The clamping assembly 4 is adjusted to respectively rotate the two butterfly knobs 431, the butterfly knobs 431 drive the screw members 43 to rotate, the screw members 43 drive the trapezoidal blocks 411 to slide in the trapezoidal grooves 223, so that the two clamping blocks 41 are driven to move close to the sample 6 until the clamping blocks 41 clamp the sample 6, and the sample 6 can be clamped and fixed on the support roller supports 22 through two sides of the sample 6.
(5) The centering component 3 is drawn out, the testing machine is adjusted again to enable the bending-resistant pressure head 5 to be pressed down on the top surface of the middle part of the sample 6, the supporting component 2 is supported by the two ends of the sample 6 at the moment, the bending-resistant pressure head 5 is pressed down by the middle part of the sample 6, the three stable contact points form two equal moments, the sample 6 is bent at three points, and then the bending mechanical property test can be carried out.
EXAMPLE 2
Referring to fig. 9, the present application differs from embodiment 1 in that: a T-shaped stop 34 is arranged on the centering block 32, and the T-shaped stop 34 is positioned on one side of the centering block 32 close to the longitudinal axis of the machine body 1. If the sample 6 is bent with a notch, when the sample 6 is placed on the positioning base 31, the T-shaped stopper 34 is caught at the notch of the sample 6, preventing the sample 6 from rolling, thereby ensuring stability when the sample 6 is placed.
The implementation principle of the application is as follows: when in use, the machine body 1 is horizontally arranged on a universal material testing machine, the supporting roller support 22 of the circular boss 222 with the required size is selected according to the test requirement, and the supporting roller support 22 is arranged on the roller base 21; then, the positioning base 31 is installed on the machine body 1, the centering block 32 is adjusted to enable the distance between the side wall of one side of the centering block 32 and the longitudinal axis of the machine body 1 to be half of the width or the diameter of the sample 6, then the sample 6 is horizontally placed on the positioning base 31, the side wall of the middle part of the sample 6 is attached to the side wall of the centering block 32, two ends of the sample 6 are respectively supported on the circular bosses 222 of the two support roller supports 22, and at the moment, the center line of the sample 6 is aligned with the longitudinal axis of the machine body 1; then, the butterfly knob 431 is rotated to enable the two clamping blocks 41 to clamp the sample 6, the sample 6 can be horizontally fixed at the central position of the two groups of supporting assemblies 2, and finally, the centering assembly 3 is taken out to perform a bending mechanical property test, so that a bending mechanical property test result is ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A centering device, includes organism (1) and supporting component (2), its characterized in that: the centering assembly (3) is detachably mounted in the middle of the machine body (1), the centering assembly (3) comprises a positioning base (31), a centering block (32) for adjusting a sample is slidably arranged at the top end of the positioning base (31), and a scale (33) for marking the position of the centering block (32) is fixedly connected to the positioning base (31); the supporting component (2) is symmetrically and fixedly arranged on the machine body (1) positioned on two sides of the positioning base (31), and the supporting component (2) is provided with a clamping component (4) used for fixing a sample.
2. A centering device as claimed in claim 1, wherein: the supporting component (2) comprises a roller base (21) connected with the machine body (1), a supporting roller support (22) is detachably mounted at the top end of the roller base (21), and the top end face of the supporting roller support (22) is a circular convex table face.
3. A centering device as claimed in claim 2, wherein: two spacing blind holes (212) have all been seted up on the relative lateral wall of roller base (21), rigid coupling has seat cover piece (221) with spacing blind hole (212) grafting cooperation on the back-up roll support (22).
4. A centering device as claimed in claim 3, wherein: the limiting blind hole (212) and the seat sleeve block (221) are both trapezoidal, and arc corners (213) are arranged at the corner positions of the limiting blind hole (212) and the seat sleeve block (221).
5. A centering device as claimed in claim 1, wherein: the clamping assembly (4) comprises two clamping blocks (41) and a threaded piece (43) which are arranged at the top end of the supporting assembly (2) in a sliding mode, the threaded piece (43) is in threaded connection with the clamping blocks (41), the two clamping blocks (41) synchronously move in the same direction or in the opposite directions along the threaded piece (43), and the clamping blocks (41) are symmetrically arranged on two sides of the central axis of the supporting assembly (2).
6. A centering device according to claim 5, characterized in that: a trapezoidal groove (223) is formed in the platform surface at the top end of the supporting component (2), a trapezoidal block (411) is fixedly connected to the lower portion of the clamping block (41), the trapezoidal block (411) is slidably arranged in the trapezoidal groove (223), and the threaded part (43) is rotatably arranged in the trapezoidal groove (223) and is in threaded connection with the trapezoidal block (411); the end part of the screw thread piece (43) penetrates out of the supporting component (2) and then is fixedly connected with a butterfly knob (431).
7. A centering device as claimed in claim 1, wherein: and a T-shaped stop block (34) is arranged on the centering block (32).
8. A centering device as claimed in claim 1, wherein: the machine body (1) is provided with a pin hole (12), and a pin head (311) which is in plug-in fit with the pin hole (12) is fixedly connected to the positioning base (31).
9. Use of the centering device according to any one of claims 1 to 8 for flexural mechanical property tests, characterized in that: the bending mechanical property test is carried out on a testing machine provided with a bending pressure head (5).
10. Use of the centering device according to claim 9 for flexural mechanical property tests, characterized in that: the method specifically comprises the following steps:
(1) installing the machine body (1) provided with the supporting component (2) and the bending-resistant pressure head (5) matched with the roller base (21) on the testing machine, and enabling the bending-resistant pressure head (5) to be located right above the middle part of the machine body (1);
(2) mounting the centering assembly (3) on the machine body (1), and adjusting the centering block (32) to enable the distance L between the side wall of the centering block and the longitudinal axis of the machine body (1) to be half of the width or the diameter of the sample (6);
(3) placing the sample (6) to enable two ends of the sample to be supported on the top surfaces of the two supporting assemblies (2) respectively, and adjusting the sample (6) to enable the side wall of the middle of the sample to be attached to the side wall of the centering block (32) which deviates from the longitudinal axis of the machine body (1) by the distance L;
(4) adjusting the clamping assembly (4) to clamp and fix the sample (6) from two sides of the sample (6);
(5) and (4) drawing out the centering component (3), and adjusting the testing machine to enable the bending resistance pressure head (5) to be pressed down on the top surface of the middle part of the sample (6), so that the bending mechanical property test can be carried out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110740084.2A CN113295516A (en) | 2021-06-30 | 2021-06-30 | Centering device and application thereof in bending mechanical property test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110740084.2A CN113295516A (en) | 2021-06-30 | 2021-06-30 | Centering device and application thereof in bending mechanical property test |
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| CN113295516A true CN113295516A (en) | 2021-08-24 |
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| CN202110740084.2A Pending CN113295516A (en) | 2021-06-30 | 2021-06-30 | Centering device and application thereof in bending mechanical property test |
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| CN117147331A (en) * | 2023-10-27 | 2023-12-01 | 中国石油大学(华东) | Three-point bending test device and test method suitable for ultrathin brittle material |
| CN118483031A (en) * | 2024-07-15 | 2024-08-13 | 力试（上海）科学仪器有限公司 | Sheet metal bending test device and test machine |
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