CN108489806B - In-situ centering clamping device and method for flat plate sample of tensile fatigue testing machine - Google Patents
In-situ centering clamping device and method for flat plate sample of tensile fatigue testing machine Download PDFInfo
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- CN108489806B CN108489806B CN201810320798.6A CN201810320798A CN108489806B CN 108489806 B CN108489806 B CN 108489806B CN 201810320798 A CN201810320798 A CN 201810320798A CN 108489806 B CN108489806 B CN 108489806B
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 45
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 45
- 238000012360 testing method Methods 0.000 claims abstract description 30
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- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
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- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
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- 208000014674 injury Diseases 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 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
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The in-situ centering clamping device and method for the flat plate sample of the tensile fatigue testing machine comprises an upper flat clamping block and a lower flat clamping block which are used for clamping the upper end and the lower end of the flat plate sample, wherein a lateral clamping mechanism used for clamping the two sides of the flat plate sample and a clamping driving mechanism used for driving the lateral clamping mechanism are arranged between the upper flat clamping block and the lower flat clamping block, one side of the lateral clamping mechanism is fixedly connected with a height and a transverse adjusting mechanism used for vertically and transversely adjusting the lateral clamping mechanism, and the lower parts of the height and the transverse adjusting mechanism are fixed on a plane in the middle of a chuck of the tensile fatigue testing machine through a switch type magnetic seat. The invention ensures the coaxiality of the flat plate sample on the clamp, solves the centering accuracy problem when the tensile fatigue testing machine installs the flat plate sample, and ensures the consistency and accuracy of the test result. On the premise of meeting the same functions, the device is simpler, the manufacturing cost is greatly reduced, and the reliability of the device is greatly improved.
Description
Technical Field
The present invention relates to a clamping device. In particular to an in-situ centering clamping device and method for a flat plate sample of a tensile fatigue testing machine.
Background
The universal tester for materials is used for testing the mechanical properties of various materials. Basic mechanical property indexes of the material, such as yield strength, tensile strength, elongation, elastic modulus and the like, can be obtained through tests of stretching, compression, bending and the like. As a metering device for quality detection, there is a higher requirement for the quality of its product itself, and the accuracy of its test results must meet the relevant standard requirements. One critical parameter for a tensile testing machine that affects the accuracy of its test results is coaxiality. And there are two factors affecting coaxiality.
Firstly, the structural rationality of the testing machine and the machining and manufacturing precision of parts. In general, under the conditions that the design structure of the testing machine is reasonable, the machining and manufacturing precision of parts is controlled and the assembly is reasonable, the coaxiality of the testing machine can be ensured, and the absolute coaxiality of the centers of the upper clamp and the lower clamp can be controlled within 0.1 mm. The coaxiality of the strain-based optical fiber can be controlled within 5 percent according to the relative strain error, and meets the requirements of related standards.
On the other hand, the accuracy of the position of the flat plate sample relative to the center line of the test machine force has a great influence on the coaxiality of the test, and the accuracy of the test result is directly influenced. If the plate specimen is clamped askew or off-center from the tester force, the test results obtained must be erroneous. For the round flat plate sample, the V-shaped clamping block is adopted, so that the self-centering function is realized, and the coaxiality error of the sample is the coaxiality error of the testing machine. But for flat plate samples, a flat clamping block must be used for clamping. Without the use of a positioning device, the clamping situation shown in fig. 1a to 1f below may occur.
Wherein fig. 1a is a front view, and fig. 1 b-1 f are side views of fig. 1a presented under various clamping conditions. Fig. 1b shows that the clamping is correct, and fig. 1c, 1d, 1e and 1f show that the clamping is incorrect. Sometimes, the deviation of the flat sample can reach more than 10mm, and the flat sample is subjected to huge bending stress during the test, so that the obtained test result is necessarily wrong. Moreover, the clamping error of the flat sample can cause equipment damage and even fracture of the clamp, thereby causing personal injury and property loss.
In order to ensure the accurate clamping position of the flat sample, the prior test machine commonly adopts a method of manually adjusting the position of the positioning ruler according to the width of the flat sample by using two mechanical positioning rules which are arranged on clamping blocks of an upper clamp and a lower clamp. This method is feasible for a small number of tests. But has the following two disadvantages and shortcomings.
1. The positioning rule is inconvenient to adjust and takes longer time. For each new specification of flat panel test sample, the operator must manually adjust the positions of the upper and lower positioning rules according to the width of the flat panel test sample. This method can seriously affect the working efficiency of users with a large number of specifications and a large number of tests (e.g., a test laboratory in a steel enterprise). In addition, during manual adjustment, a positioning rule adjustment error often occurs due to a reading error, so that a flat sample is tested under the error condition, and an error test result is obtained.
2. The positioning ruler is easy to damage. When the flat sample is manually clamped, because the dead weight of the flat sample is large, the vertical position of the flat sample is difficult to accurately control, and therefore, the arc transition shoulder on the side surface of the flat sample is always clamped on the positioning ruler. As the flat sample stretches under tension, the positioning rule is also easily stretch-bent, resulting in damage to the positioning rule.
For both reasons, in a user unit with a large test volume and a large specification, a conventional flat sample positioning ruler is often not effective and is abandoned. The operator can only clamp the flat sample by hand feeling and vision according to the operation skill and experience of the operator. This situation tends to have a non-underestimated impact on the accuracy and consistency of the test results.
In addition, there is a tensile testing machine intelligent flat sample centering device (CN 104713770A), the device does not directly contact the gauge length section of the backup plate and the flat sample in the centering process, so that the surface of the gauge length section of the flat sample with higher surface requirements is obviously influenced, a large number of scratches are easy to appear, the test result of the fatigue test is greatly influenced, and the device has high manufacturing cost and complex operation.
To ensure proper clamping of the plate specimen, a more convenient and accurate plate specimen positioning device must be employed to limit the position of the plate specimen on the clamp in the fore-and-aft direction.
Disclosure of Invention
The invention aims to solve the technical problem of providing an in-situ centering clamping device and method for a flat plate sample of a tensile fatigue testing machine.
The technical scheme adopted by the invention is as follows: the utility model provides a tensile fatigue testing machine flat sample's normal position centering clamping device, includes upper flat clamp splice and lower flat clamp splice that is used for pressing from both sides the flat sample upper and lower both ends, is provided with the side direction fixture that is used for the centre gripping flat sample both sides and is used for the drive between upper flat clamp splice and lower flat clamp splice side direction fixture's clamping driving mechanism, side direction fixture's one side fixedly connected with is used for perpendicular and lateral adjustment side direction fixture's height and lateral adjustment mechanism, height and lateral adjustment mechanism's lower part is fixed on the plane in the middle of tensile fatigue testing machine's chuck through switch formula magnetic seat.
The lateral clamping mechanism comprises: the clamping device is characterized in that the clamping device is arranged between the upper flat clamping block and the lower flat clamping block and used for clamping left and right sides of a flat plate sample, a first reverse transmission screw thread and a second reverse transmission screw thread are respectively penetrated through two opposite angles of the left clamping plane and the right clamping plane through threads, a first guiding polished rod and a second guiding polished rod are respectively penetrated through other two opposite angles of the left clamping plane and the right clamping plane, wherein left ends of the first reverse transmission screw thread and the second reverse transmission screw thread are rotatably connected to two opposite angles of a supporting and fixing plate through bearing mechanisms, left ends of the first guiding polished rod and the second guiding polished rod are fixedly connected to other two opposite angles of the supporting and fixing plate, and right ends of the first reverse transmission screw thread, the second reverse transmission screw thread, the first guiding polished rod and the second guiding polished rod are respectively connected with the clamping and driving mechanism.
The clamping driving mechanism comprises a transmission mounting plate fixedly connected to the right ends of the first guide polish rod and the second guide polish rod, and two reverse transmission screw gears respectively fixedly connected to the right ends of the first reverse transmission screw and the second reverse transmission screw, wherein tooth-shaped pulleys are connected to the two reverse transmission screw gears in a meshed mode, a servo motor with a speed reducer is mounted in the middle of the transmission mounting plate, an output shaft of the servo motor is adjacent to the tooth-shaped pulleys, a transmission gear is connected to the output shaft of the servo motor, and the transmission gear is connected with the tooth-shaped pulleys in a meshed mode.
The height and transverse adjusting mechanism comprises: the support fixed plate in the side fixture is kept away from the slider locating piece on the side of left side centre gripping plane and right side centre gripping plane one side, the slider locating piece is hollow structure, and upper and lower side and front and back side are formed with symmetrical through-hole, be provided with the through-hole slider in the hollow structure of slider locating piece, the through-hole slider on be formed with the axial through-hole that link up from top to bottom, the through-hole of slider locating piece upper and lower side and the axial through-hole of through-hole slider in the through-hole be provided with the supporting screw, the through-hole slider with the supporting screw is clearance fit, the lower extreme of supporting screw passes through threaded connection in the support sleeve, the outside of support sleeve is connected switch formula magnetic force seat to fix on the plane in the middle of the chuck of tensile fatigue testing machine through switch formula magnetic force seat, the supporting screw be located the lower threaded connection of slider locating piece have the high unidirectional positioning nut that is used for fixing a position side fixture height.
A clamping method of an in-situ centering clamping device for a flat plate sample of a tensile fatigue testing machine comprises the following steps:
1) Placing an in-situ centering clamping device of a flat plate sample of the tensile fatigue testing machine on the tensile fatigue testing machine, and sucking the in-situ centering clamping device on a plane in the middle of a chuck of the tensile fatigue testing machine by using a switch type magnetic seat;
2) The support screw is used for supporting the integral in-situ centering clamping device, and meanwhile, the height unidirectional positioning nut is adjusted to enable the lower surfaces of the left clamping plane and the right clamping plane in the lateral clamping mechanism to be in contact with the upper surface of the lower flat clamping block;
3) Controlling the lateral clamping device through a servo motor, and aligning the outer sides of the left clamping plane and the right clamping plane with the outer sides of the lower flat clamping blocks;
4) Placing the flat sample between a left clamping plane and a right clamping plane of the lateral clamping device;
5) The servo motor is controlled to reversely rotate, and the left clamping plane and the right clamping plane are driven to horizontally move on the upper surface of the lower flat clamping block through the rotary motion of the first reverse transmission screw thread and the second reverse transmission screw thread, so that the closing action of the left clamping plane and the right clamping plane is realized, and a flat plate sample is clamped;
6) Clamping a lower flat clamping block of the tensile fatigue testing machine, so that the lower end of a flat plate sample is clamped, and in the clamping process, the clamping head moves downwards to separate a high unidirectional positioning nut from the bottom of a sliding block positioning block so as to match with the downward movement of the clamping head; meanwhile, in the clamping process, the flat plate sample is unconstrained along the clamping direction, so that tiny movement parallel to the clamping direction can occur, and tiny displacement generated by clamping is balanced through the movement of the through hole sliding block in the sliding block positioning block;
7) Adjusting the position of an upper chuck of the upper tensile fatigue testing machine, and clamping an upper flat clamping block, so that the upper end of a flat plate sample is clamped;
8) The lateral clamping device is loosened through the servo motor, the distance between the left clamping plane and the right clamping plane is ensured to be larger than the widths of the lower flat clamping block and the upper flat clamping block, and the in-situ centering clamping device of the whole flat plate sample is positioned at a safe position.
The in-situ centering clamping device and method for the flat plate sample of the tensile fatigue testing machine, disclosed by the invention, have the advantages that the coaxiality problem of the flat plate sample on the clamp is ensured, the centering accuracy problem when the flat plate sample is installed by the tensile fatigue testing machine is solved, and the consistency and accuracy of the test result are ensured. On the premise of meeting the same functions, the device is simpler, the manufacturing cost is greatly reduced, and the reliability of the device is greatly improved.
Drawings
FIG. 1a is a front view of a clamp without the use of a positioning device;
FIG. 1b is a top view of FIG. 1a with the clamping correct without the use of a positioning device;
FIG. 1c is a top view of FIG. 1a with a first clamping error without the use of a positioning device;
FIG. 1d is a top view of FIG. 1a with a second clamping error without the use of a positioning device;
FIG. 1e is a top view of FIG. 1a with a third clamping error without the use of a positioning device;
FIG. 1f is a top view of FIG. 1a with a fourth clamping error without the use of a positioning device;
FIG. 2 is a schematic structural view of an in-situ centering clamping device for a flat plate sample of the tensile fatigue testing machine of the present invention;
FIG. 3 is a schematic diagram of the driving device matching relationship in the present invention;
FIG. 4 is a schematic view of the structure of the present invention without a drive device;
FIG. 5 is a schematic diagram showing the operation process of the in-situ centering clamping device of the flat plate sample of the tensile fatigue testing machine.
In the figure
1: support fixed plate 2: supporting screw
3: the slide block positioning block 4: through hole slider
5a: first reverse transfer screw 5b: second reverse transfer screw
6: height unidirectional positioning nut 7a: first guiding polish rod
7b: second guiding polish rod 8: left clamping plane
9: right clamping plane 10: switch type magnetic base
11: support sleeve 12: lower flat clamping block
13: the transmission mounting plate 14: servo motor
15: transmission gear 16: reverse transfer screw lead screw gear
17: toothed pulley 18: upper flat clamping block
0: flat sample
Detailed Description
The in-situ centering clamping device of the flat plate sample of the tensile fatigue testing machine is described in detail below with reference to the examples and the accompanying drawings.
As shown in fig. 2, the in-situ centering clamping device for the flat plate sample of the tensile fatigue testing machine comprises an upper flat clamping block 18 and a lower flat clamping block 12, wherein the upper flat clamping block 18 and the lower flat clamping block 12 are used for clamping the upper end and the lower end of the flat plate sample 0, a lateral clamping mechanism used for clamping the two sides of the flat plate sample 0 and a clamping driving mechanism used for driving the lateral clamping mechanism are arranged between the upper flat clamping block 18 and the lower flat clamping block 12, one side of the lateral clamping mechanism is fixedly connected with a height and a transverse adjusting mechanism used for vertically and transversely adjusting the lateral clamping mechanism, and the lower parts of the height and the transverse adjusting mechanism are fixed on a plane in the middle of a chuck of the tensile fatigue testing machine through a switch type magnetic seat 10.
As shown in fig. 2, 3 and 4, the lateral clamping mechanism includes: the left side clamping plane 8 and the right side clamping plane 9 which are arranged between the upper flat clamping block 18 and the lower flat clamping block 12 and used for clamping the left side and the right side of the flat plate sample 0, a first reverse transmission screw thread 5a and a second reverse transmission screw thread 5b are respectively penetrated through threads on two opposite angles of the left side clamping plane 8 and the right side clamping plane 9, a first guide polish rod 7a and a second guide polish rod 7b are respectively penetrated through other two opposite angles of the left side clamping plane 8 and the right side clamping plane 9, wherein left ends of the first reverse transmission screw thread 5a and the second reverse transmission screw thread 5b are rotatably connected on two opposite angles of the support fixing plate 1 through bearing mechanisms, left ends of the first guide polish rod 7a and the second guide polish rod 7b are fixedly connected on other two opposite angles of the support fixing plate 1, and right ends of the first reverse transmission screw thread 5a, the second reverse transmission screw thread 5b, the first guide polish rod 7a and the second guide polish rod 7b are respectively connected with the clamping mechanisms.
As shown in fig. 2, the clamping driving mechanism comprises a transmission mounting plate 13 fixedly connected to the right ends of the first guiding polished rod 7a and the second guiding polished rod 7b, and two reverse transmission screw gears 16 respectively fixedly connected to the right ends of the first reverse transmission screw 5a and the second reverse transmission screw 5b, wherein toothed pulleys 17 are connected to the two reverse transmission screw gears 16 in a meshed manner, a servo motor 14 with a speed reducer is mounted in the middle of the transmission mounting plate 13, an output shaft of the servo motor 14 is adjacent to the toothed pulleys 17, a transmission gear 15 is connected to an output shaft of the servo motor 14, and the transmission gear 15 is connected with the toothed pulleys 17 in a meshed manner.
As shown in fig. 2 and 4, the height and lateral adjustment mechanism includes: the support fixed plate 1 in the side fixture is kept away from the slider locating piece 3 on the side of left side centre gripping plane 8 and right side centre gripping plane 9 one side, slider locating piece 3 is hollow structure, and goes up downside and front and back side and be formed with symmetrical through-hole, be provided with through-hole slider 4 in the hollow structure of slider locating piece 3, through-hole slider 4 on be formed with the axial through-hole that link up from top to bottom, the through-hole of slider locating piece 3 goes up the through-hole of side and through-hole slider 4 is provided with supporting screw 2 in the axial through-hole that runs through, through-hole slider 4 with supporting screw 2 is clearance fit, the lower extreme of supporting screw 2 passes through threaded connection in supporting sleeve 11, can make supporting screw 2 rotate in supporting sleeve 11 inside, through supporting screw 2 and the cooperation of high unidirectional positioning nut 6 and supporting sleeve 11 to reach the purpose of the required height of whole centering clamping device of adjustment.
The outer side of the supporting sleeve 11 is connected with the switch type magnetic seat 10 and is fixed on a plane in the middle of a chuck of the tensile fatigue testing machine through the switch type magnetic seat 10, and the supporting screw 2 is in threaded connection with a high unidirectional positioning nut 6 for positioning the height of the lateral clamping mechanism at the lower part of the sliding block positioning block 3. The switch type magnetic seat 10 is adopted to realize quick assembly disassembly, the whole height and transverse adjusting mechanism can be absorbed on the absolute plane of the chuck, the fixing of the whole in-situ centering clamping device is realized, and the support and the good flatness and perpendicularity are provided for the whole in-situ centering clamping device.
Because the switch type magnetic seat 10 is arranged on the plane in the middle of the clamping head of the tensile fatigue testing machine, when the tensile fatigue testing machine is operated to clamp and test, the clamping head can generate a downward tiny position, the upper flat clamping block 18 and the lower flat clamping block 12 move towards the flat plate sample simultaneously through the inclined surfaces between the clamping head and the upper flat clamping block 18 and the lower flat clamping block 12, and finally the flat plate sample is clamped on the testing machine.
Due to the small displacement generated during clamping of the tensile fatigue testing machine, the height and transverse adjusting mechanism is restrained to move downwards on the side clamping device by the one-way height positioning nut 6, and the side clamping device is not restrained in the lifting direction, so that the upper flat clamping block 18 does not incline when moving upwards relative to the clamping head when the clamping head moves downwards. Because the flat sample has a certain thickness, before clamping, an experimenter can hardly ensure that the thickness center line is coincided with the center line of the complete closing of the upper flat clamping block 18 and the lower flat clamping block 12, so that two surfaces of the flat sample can be contacted with the surfaces of the upper flat clamping block 18 and the lower flat clamping block 12 in sequence in the clamping process, and therefore, the through hole sliding block 4 can not only slide left and right to adapt to the transverse displacement of the flat sample, but also allow the supporting screw rod 2 to pass through the through hole of the supporting screw rod.
The in-situ centering clamping device for the flat plate sample of the tensile fatigue testing machine is characterized in that a flat plate sample 0 placing section is positioned between an upper flat clamping block 18 and a lower flat clamping block 12 of the tensile fatigue testing machine. In the test, the flat sample 0 is located in the sample placing section, the upper end is clamped by the upper flat clamping block 18, and the lower end is clamped by the lower flat clamping block 12.
As shown in fig. 5, the clamping method of the in-situ centering clamping device for the flat plate sample of the tensile fatigue testing machine comprises the following steps:
1) Placing an in-situ centering clamping device of a flat plate sample of the tensile fatigue testing machine on the tensile fatigue testing machine, and sucking the in-situ centering clamping device on a plane in the middle of a chuck of the tensile fatigue testing machine by using a switch-type magnetic seat 10;
2) The support screw 2 is used for supporting the integral in-situ centering clamping device, and meanwhile, the height unidirectional positioning nut 6 is adjusted to enable the lower surfaces of the left clamping plane 8 and the right clamping plane 9 in the lateral clamping mechanism to be in contact with the upper surface of the lower flat clamping block 12;
3) Controlling the lateral clamping means by means of the servo motor 14 will align the outer sides of the left and right clamping planes 8, 9 with the outer sides of the lower flat clamping block 12, as shown in fig. 5 a;
4) Placing the flat sample between the left clamping plane 8 and the right clamping plane 9 of the lateral clamping device, as shown in fig. 5b, c;
5) The servo motor 14 is controlled to reversely rotate, and the left clamping plane 8 and the right clamping plane 9 are driven to horizontally move on the upper surface of the lower flat clamping block 12 through the rotary motion of the first reverse transmission screw 5a and the second reverse transmission screw 5b, so that the closing action of the left clamping plane 8 and the right clamping plane 9 is realized, and a flat plate sample is clamped, as shown in d and e in fig. 5;
6) Clamping a lower flat clamping block 12 of the tensile fatigue testing machine, so as to clamp the lower end of a flat plate sample, and in the clamping process, moving the clamping head downwards to separate a high unidirectional positioning nut 6 from the bottom of the sliding block positioning block 3 so as to match with the downward movement of the clamping head; meanwhile, in the clamping process, the flat plate sample is unconstrained along the clamping direction, so that tiny movement parallel to the clamping direction can occur, and tiny displacement generated by clamping is balanced through the movement of the through hole sliding block 4 in the sliding block positioning block 3;
7) Adjusting the position of an upper chuck of the upper tensile fatigue testing machine, and clamping an upper flat clamping block 18, so as to clamp the upper end of a flat plate sample;
8) The lateral clamping device is released by the servo motor 14, and the distance between the left clamping plane 8 and the right clamping plane 9 is ensured to be larger than the width of the lower flat clamping block 12 and the upper flat clamping block 18, so that the in-situ centering clamping device of the whole flat plate sample is in a safe position, as shown by f and g in fig. 5.
Claims (2)
1. The in-situ centering clamping device for the flat plate sample of the tensile fatigue testing machine comprises an upper flat clamping block (18) and a lower flat clamping block (12) which are used for clamping the upper end and the lower end of the flat plate sample (0), and is characterized in that a lateral clamping mechanism used for clamping the two sides of the flat plate sample (0) and a clamping driving mechanism used for driving the lateral clamping mechanism are arranged between the upper flat clamping block (18) and the lower flat clamping block (12), one side of the lateral clamping mechanism is fixedly connected with a height and a transverse adjusting mechanism used for vertically and transversely adjusting the lateral clamping mechanism, and the lower parts of the height and the transverse adjusting mechanism are fixed on a plane in the middle of a chuck of the tensile fatigue testing machine through a switch type magnetic seat (10);
the lateral clamping mechanism comprises: the left side clamping plane (8) and the right side clamping plane (9) are arranged between the upper flat clamping block (18) and the lower flat clamping block (12) and used for clamping the left side and the right side of the flat plate sample (0), a first reverse transmission screw thread lead screw (5 a) and a second reverse transmission screw thread lead screw (5 b) are respectively penetrated through threads on two opposite angles of the left side clamping plane (8) and the right side clamping plane (9), a first guide polished rod (7 a) and a second guide polished rod (7 b) are respectively penetrated through the other two opposite angles of the left side clamping plane (8) and the right side clamping plane (9), wherein the left ends of the first reverse transmission screw thread lead screw (5 a) and the second reverse transmission screw thread lead screw (5 b) are rotatably connected to two opposite angles of the support fixing plate (1) through a bearing mechanism, and the left ends of the first guide polished rod (7 a) and the second guide polished rod (7 b) are fixedly connected to the other two opposite angles of the support fixing plate (1), and the left ends of the first reverse transmission screw thread lead screw (5 a) and the second guide polished rod (7 b) are respectively connected to the first guide polished rod (7 a) and the second guide polished rod drive screw thread lead screw rod (7 b);
the clamping driving mechanism comprises a transmission device mounting plate (13) fixedly connected to the right ends of the first guide polish rod (7 a) and the second guide polish rod (7 b), and two reverse transmission screw gears (16) respectively fixedly connected to the right ends of the first reverse transmission screw (5 a) and the second reverse transmission screw (5 b), wherein toothed pulleys (17) are connected to the two reverse transmission screw gears (16) in a meshed manner, a servo motor (14) with a speed reducer is mounted in the middle of the transmission device mounting plate (13), an output shaft of the servo motor (14) is adjacent to the toothed pulleys (17), a transmission gear (15) is connected to an output shaft of the servo motor (14), and the transmission gear (15) is connected with the toothed pulleys (17) in a meshed manner;
the height and transverse adjusting mechanism comprises: the utility model provides a support fixed plate (1) in fixed connection in side fixture keeps away from slider locating piece (3) on the side of left side centre gripping plane (8) and right side centre gripping plane (9) one side, slider locating piece (3) are hollow structure, and go up downside and front and back side and be formed with symmetrical through-hole, be provided with through-hole slider (4) in the hollow structure of slider locating piece (3), through-hole slider (4) on be formed with the axial through-hole that link up from top to bottom, the through-hole of slider locating piece (3) up and down side and through-hole slider (4) axial through-hole in be provided with supporting screw (2), through-hole slider (4) with supporting screw (2) are clearance fit, the lower extreme of supporting screw (2) is through threaded connection in supporting sleeve (11), the outside of supporting sleeve (11) is connected switch formula magnetic seat (10) to fix on the plane in the middle of the chuck of tensile fatigue testing machine through switch formula magnetic seat (10), supporting screw (2) be located the lower part of slider (3) is connected with high location nut of side direction location mechanism (6).
2. A method of clamping a flat panel test sample in an in-situ centering and clamping device of a tensile fatigue testing machine as set forth in claim 1, comprising the steps of:
1) Placing an in-situ centering clamping device of a flat plate sample of the tensile fatigue testing machine on the tensile fatigue testing machine, and sucking the in-situ centering clamping device on a plane in the middle of a chuck of the tensile fatigue testing machine by using a switch type magnetic seat (10);
2) The support screw (2) is used for supporting the integral in-situ centering clamping device, and meanwhile, the height unidirectional positioning nut (6) is adjusted to enable the lower surfaces of the left clamping plane (8) and the right clamping plane (9) in the lateral clamping mechanism to be in contact with the upper surface of the lower flat clamping block (12);
3) Controlling the lateral clamping device through a servo motor (14) to align the outer sides of the left clamping plane (8) and the right clamping plane (9) with the outer sides of the lower flat clamping blocks (12);
4) Placing a flat sample between a left clamping plane (8) and a right clamping plane (9) of the lateral clamping device;
5) The servo motor (14) is controlled to reversely rotate, and the left clamping plane (8) and the right clamping plane (9) are driven to horizontally move on the upper surface of the lower flat clamping block (12) through the rotary motion of the first reverse transmission screw (5 a) and the second reverse transmission screw (5 b), so that the closing action of the left clamping plane (8) and the right clamping plane (9) is realized, and a flat sample is clamped;
6) Clamping a lower flat clamping block (12) of the tensile fatigue testing machine, so as to clamp the lower end of a flat plate sample, and enabling the clamping head to move downwards in the clamping process to separate a high unidirectional positioning nut (6) from the bottom of a sliding block positioning block (3) so as to match with the downward movement of the clamping head; meanwhile, in the clamping process, the flat plate sample is unconstrained along the clamping direction, so that tiny movement parallel to the clamping direction can occur, and tiny displacement generated by clamping is balanced through the movement of the through hole sliding block (4) in the sliding block positioning block (3);
7) Adjusting the position of an upper chuck of the upper tensile fatigue testing machine, and clamping an upper flat clamping block (18), so as to clamp the upper end of a flat plate sample;
8) The lateral clamping device is loosened through the servo motor (14), and the distance between the left clamping plane (8) and the right clamping plane (9) is ensured to be larger than the widths of the lower flat clamping block (12) and the upper flat clamping block (18), so that the in-situ centering clamping device of the whole flat plate sample is positioned at a safe position.
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