CN109540656B - Anti-skid lossless clamp suitable for flexible high-performance fiber bundle and application - Google Patents
Anti-skid lossless clamp suitable for flexible high-performance fiber bundle and application Download PDFInfo
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- CN109540656B CN109540656B CN201811508825.9A CN201811508825A CN109540656B CN 109540656 B CN109540656 B CN 109540656B CN 201811508825 A CN201811508825 A CN 201811508825A CN 109540656 B CN109540656 B CN 109540656B
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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
- 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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Abstract
The invention provides an anti-skid and nondestructive clamp holder suitable for a flexible high-performance fiber bundle and application thereof, comprising an upper clamp head and a lower clamp head which are oppositely arranged, wherein the upper clamp head and the lower clamp head are respectively formed by sequentially connecting a hard high polymer layer of a clamping surface, a hard metal layer of a middle support and a steel block for fixing at the bottom; the clamping surface of the hard polymer layer is flat and smooth, and the other surface of the hard polymer layer is in a sine wave shape; one surface of the hard metal layer connected with the hard polymer layer is in a sine waveform conjugated with the sine waveform of the other surface of the hard polymer layer; the sine wave forms of the hard high polymer layers of the upper chuck and the lower chuck are conjugated and parallel complementary. By the bending action of the sine wave, the friction coefficient can be increased, and the fiber can be clamped more effectively. The invention can be arranged on the holder seat of a fiber bundle strength instrument, and can also be arranged on the holder seats of various strength measuring devices, and is used for clamping fiber bundles, films and fabrics with uniform stress, skid resistance and pinch resistance, so that the strength measurement is accurate.
Description
Technical Field
The invention relates to a tensile anti-skid and nondestructive clamp suitable for a flexible high-performance fiber bundle and application thereof, belonging to the technical field of fiber material strength measurement.
Background
The strength measurement is derived from material measurements, so that the conventional clamping heads are printed with diamond-shaped ridges on the clamping surfaces and hardened by quenching to obtain a structure capable of embedding the clamped object in the clamping, so as to prevent slipping and stabilize the holding. This is possible for metal objects of large form and high stiffness, but is fatal for fibrous materials of small form and high stiffness, since the clamping directly results in damage or even breakage of the fibers.
Most of the existing chucks have increased hardness and increased pressure to increase friction. For example, patent 200820150156.8 discloses an engineering fiber tensile strength tester gripper, which is a combination mode and a structure of a movable clamping piece, a fixed clamping piece and a clamping block, wherein the upper and lower grippers and the clamping block with a screw hole are L-shaped and are applied to short fibers of engineering fibers; the movable clamping piece and the fixed clamping piece are combined together through the screw, the tightness of the screw influences the stress stability of the sample and the service life of the clamp, and the fiber is stressed maximally on the inner side edge of the clamp head in the stress process, so that the stress of the fiber is uneven and the test result of the fiber is influenced. The article "automatic tensile testing of elastic fibers" (Stein, Klotz, Germanova-Krasteva, et al. automatic tensile testing of elastic fibers [ J ]. international textile guide, 2009,37(6):7-8) describes the BISFA rotary clamping method on a conventional CRE-type tensile testing machine and the clamp of the Statin atMEL machine using a special C-type metal jaw and a soft flat jaw in combination. Both holders minimize fiber slippage and breakage, but the higher holding pressure causes premature fiber breakage within the holder.
The fiber tensile tester holder is a key part on a fiber tensile tester, is used for holding tested fibers, and directly influences the test of the fiber tensile property according to the performance of the fiber tensile tester holder.
Disclosure of Invention
The invention aims to solve the technical problem of providing a clamp holder which is suitable for a flexible high-performance fiber bundle, can ensure that a fiber sample is easy to clamp, is not easy to slip and pull, is not easy to pinch off and damage fibers, and has uniform clamping force so as to ensure the correctness of the test.
In order to solve the technical problems, the technical scheme of the invention is to provide an anti-skid lossless gripper suitable for a flexible high-performance fiber bundle, which is characterized in that: the clamp comprises an upper clamp head and a lower clamp head which are oppositely arranged, wherein the upper clamp head and the lower clamp head are respectively formed by sequentially connecting a hard high polymer layer of a clamping surface, a hard metal layer of a middle support and a steel block for fixing at the bottom;
the clamping surface of the hard polymer layer is flat and smooth, and the other surface of the hard polymer layer is in a sine wave shape; one surface of the hard metal layer connected with the hard polymer layer is in a sine waveform conjugated with the sine waveform of the other surface of the hard polymer layer;
the sine wave forms of the hard high polymer layers of the upper chuck and the lower chuck are conjugated and parallel complementary.
Preferably, the wave number of the sine waves on the other surface of the hard high polymer layer is 2-4, and the wave amplitude is 1-4 mm.
Preferably, the hard high polymer layer is a polyester sheet, a polyimide sheet or a hard rubber sheet.
Preferably, the thickness of the hard polymer layer is equal to the diameter of the fiber bundle.
Preferably, the sine wave on the other side of the hard polymer layer is completely matched with the sine wave on the hard metal layer, and the two layers are sealed, bonded and fixed.
Preferably, the steel block is fixed with the hard metal layer in an adhesion mode.
Preferably, the steel block and the hard metal layer are of an integral structure of the same metal.
Preferably, the hard metal layer is a steel sheet, a hard steel sheet, a quenched steel sheet or a stainless steel sheet.
Preferably, the steel block is directly embedded into the holder seat; or the steel block is fixedly connected with the holder seat through a screw, and a screw hole for fixing is arranged on the side surface or the bottom surface of the steel block.
The invention also provides the application of the anti-skid and nondestructive clamp holder suitable for the flexible high-performance fiber bundle, which is used for uniformly clamping the high polymer material in an anti-skid and anti-pinch manner so as to realize strong measurement; the high polymer materials include, but are not limited to, fiber bundles, films, fabrics. Is especially suitable for the nondestructive and antiskid clamping of high-strength, high-modulus and rigid-brittle fibers.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
(a) the three-layer structure of the hard polymer layer, the supported hard metal layer and the fixed steel block ensures that the clamping force on the sample can be uniform and consistent, the fiber can be uniformly clamped, and the fiber is not easy to slip or clamp, so as to ensure the correctness of the test result;
(b) the clamping surface in the clamp holder can correctly select proper materials and shapes according to the properties of a clamped sample, particularly the bending action of a sine wave can increase the friction coefficient and clamp fibers more effectively;
(c) due to the sine wave-shaped chucks which are matched with each other up and down, the fiber bundle section can be clamped by effectively and uniformly distributing pressure, and the fiber can be clamped more efficiently and with low consumption.
Drawings
FIG. 1 is a schematic view of a non-slip and non-destructive clamp suitable for flexible high performance fiber bundles;
FIG. 2 is another schematic view of an anti-slip non-destructive clamp for a flexible high performance fiber bundle;
description of reference numerals:
1-hard high polymer layer, 2-hard metal layer and 3-steel block.
Detailed Description
The invention will be further illustrated with reference to the following specific examples.
Fig. 1 is a schematic view of an anti-skid and nondestructive clamp suitable for a flexible high-performance fiber bundle, which comprises an upper clamp and a lower clamp, wherein the upper clamp and the lower clamp respectively comprise a hard high polymer layer 1 of a clamping surface, a hard metal layer 2 of a middle support and a steel block 3 of which the bottom is used for fixing.
The front surface (clamping surface) of the hard polymer layer 1 is flat and smooth, and the back surface is in a sine wave shape. The surface of the hard metal layer 2 connected with the hard polymer layer 1 and the reverse surface of the hard polymer layer 1 are in a conjugated sine waveform. The steel block 3 is fixedly bonded with the hard metal layer 2, as shown in figure 1; or is of a unitary structure with the hard metal layer 2 as shown in fig. 2.
The sine wave forms of the hard high polymer layers 1 of the upper chuck and the lower chuck are conjugated and parallel complementary.
The wave number of the sine waves on the reverse side of the hard high polymer layer 1 is 2-4 in the clamping range (the thickness of the clamp) of the clamp; the amplitude is 1-4 mm.
The hard high polymer layer 1 is a polyester sheet, a polyimide sheet or a hard rubber sheet. The thickness of the hard polymer layer 1 is equal to the diameter of the fiber bundle.
The sine wave shape of the reverse side of the hard polymer layer 1 is completely matched with the sine wave shape of the hard metal layer 2, so that the bonding can be effectively and perfectly carried out.
The hard metal layer 2 is a steel sheet, a hard steel sheet, a quenched steel sheet or a stainless steel sheet.
The surface of the steel block 3 is flat and smooth and can be bonded with the hard metal layer 2; or the surface of the steel block 3 directly forms a sine wave conjugated with the reverse sine wave of the hard high polymer layer 1. The steel block 3 can be directly embedded into the holder seat, or a pair of screw holes for fixing are arranged on the side surface or the bottom surface of the steel block.
The adhesive for bonding adopts the adhesive which has good bonding performance and high temperature resistance and is of silicone hot melt adhesives and epoxy hot melt adhesives with good bonding performance with metal and polyesters.
The invention is suitable for the non-slip and non-destructive clamper of the flexible high-performance fiber bundle, can be arranged on a clamper base of a bundle fiber strength instrument, and can also be arranged on the clamper base of various strength measuring devices, and is used for uniformly, non-slip and anti-pinch clamping of high polymer materials such as fiber bundles, films, fabrics and the like, so that the strength measurement is more accurate, and the invention is particularly suitable for the non-slip and anti-pinch clamping of high-strength, high-modulus and rigid-brittle fibers.
The invention mainly utilizes the bending track to divide force and increase the friction holding length, and utilizes the holding bending to increase the internal stress, thereby reducing the stress concentration in the stretching process and the clamping slippage failure in the stretching process. The bending track component force and the holding are adopted to increase the internal stress, so that the stress of the fiber bundle on the inner side edge of the chuck is the largest, the fibers are prevented from slipping and drawing, and the toughness of the middle layer is good. Therefore, the defects that the tested fiber sample is easy to slip and clamp are overcome, and the test result of the fiber strength and elongation test is improved.
Several specific application examples are described below.
Example 1: carbon fiber
The clamp suitable for the flexible high-performance fiber bundle is adopted. And (3) flatly arranging the bundle fibers on the fixed clamping blocks, closing the left clamp and the right clamp simultaneously to fix the bundle fibers, and operating all controls through a computer interface. Firstly, initializing a motor, setting a test gauge, turning on a light source of a CCD camera, adjusting the camera shooting position, starting an automatic carding program, and automatically carding the fasciated fibers twice by a carding mechanism. Then the air suction system is started to suck air, simultaneously, the cutters at the two ends cut off fibers from between the fixed clamping block and the clamping head, the cut-off fibers are sucked into the left suction groove and the right suction groove respectively, and then are collected into the weighing plate through the left conveying pipe and the right conveying pipe to be weighed. And starting a measuring program, and simultaneously starting the movable clamp displacement mechanism, the CCD imaging system and the acoustic measuring device to work. The movable stepping motor drives the movable clamp displacement mechanism to move rightwards through the movable screw and the movable nut to stretch the bundle fiber, the microphone records sound in the stretching process and automatically analyzes the sound through a computer, and the CCD camera records an image of the whole process of stretching and breaking the bundle fiber.
The sample is made of 2.2K carbon fiber, the stretching speed is 10mm/min, and the distance is 10 mm. Environmental conditions of the experiment: the temperature was 20 ℃ and the relative humidity was 65%.
Example 2: fibrilia
The sample is made of 0.9tex of fibrilia, the stretching speed is 10mm/min, and the distance is 10 mm. Environmental conditions of the experiment: the temperature was 20 ℃ and the relative humidity was 65%.
Example 3: linen yarn rib fabric
The sample is linen rib fabric with the size of 200mm multiplied by 50mm, the drawing speed of 10mm/min and the distance of 100 mm. Environmental conditions of the experiment: the temperature was 20 ℃ and the relative humidity was 65%.
Example 4: PVC film structure material
The sample is made of a PVC film structure material, the base cloth is made of polyester fibers, two sides of the base cloth are coated with PVC resin, and a layer of polyacrylic resin is coated outside the coating. The size of the sample is 150mm multiplied by 25 mm; the drawing speed was 50mm/min and the distance was 75 mm. Environmental conditions of the experiment: the temperature was 20 ℃ and the relative humidity was 65%.
The samples selected in the embodiments 2 to 4 are respectively fibrilia 0.9tex, linen rib fabric and PVC film structure materials, and the specific steps are the same as those in the embodiment 1 except that an automatic carding mechanism is not required to be started for carding. The results of the experiments are shown in Table 1.
TABLE 1 tensile Properties in the respective index tables
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalents to the disclosed technology without departing from the spirit and scope of the present invention, and all such changes, modifications and equivalents are intended to be included therein as equivalents of the present invention; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (1)
1. The utility model provides a be suitable for harmless holder of antiskid of flexible high performance tow which characterized in that: the clamp comprises an upper clamp head and a lower clamp head which are oppositely arranged, wherein the upper clamp head and the lower clamp head are formed by sequentially connecting a hard high polymer layer (1) of a clamping surface, a hard metal layer (2) of a middle support and a steel block (3) of which the bottom is used for fixing;
the clamping surface of the hard high polymer layer (1) is flat and smooth, and one surface opposite to the clamping surface is in a sine wave shape; the surface of the hard metal layer (2) connected with the hard polymer layer (1) is a sine wave conjugated with the sine wave of the surface of the hard polymer layer (1) in the sine wave shape;
the sine wave forms of the hard high polymer layers (1) of the upper and lower chucks are conjugated and parallel complementary;
the hard high polymer layer (1) is provided with 2-4 sine wave numbers and 1-4 mm amplitude on one surface in a sine wave shape;
the hard high polymer layer (1) is a polyester sheet, a polyimide sheet or a hard rubber sheet;
the thickness of the hard high polymer layer (1) is equal to the diameter of the fiber bundle;
the sine wave of one surface of the hard polymer layer (1) in a sine wave shape is completely matched with the sine wave on the hard metal layer (2), and the sine wave are sealed, bonded and fixed;
the steel block (3) is fixedly bonded with the hard metal layer (2);
the steel block (3) and the hard metal layer (2) are of an integrated structure of the same metal;
the hard metal layer (2) is a hard steel sheet, a quenched steel sheet or a stainless steel sheet;
the steel block (3) is directly embedded into the holder seat; or the steel block (3) is fixedly connected with the holder seat through a screw, and a screw hole for fixing is formed in the side surface or the bottom surface of the steel block (3);
the clamping device is used for uniformly and antiskid clamping and injury prevention of high polymer materials so as to realize strong measurement; the high polymer material comprises fiber bundles, films and fabrics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508825.9A CN109540656B (en) | 2018-12-11 | 2018-12-11 | Anti-skid lossless clamp suitable for flexible high-performance fiber bundle and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508825.9A CN109540656B (en) | 2018-12-11 | 2018-12-11 | Anti-skid lossless clamp suitable for flexible high-performance fiber bundle and application |
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| Publication Number | Publication Date |
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| CN109540656A CN109540656A (en) | 2019-03-29 |
| CN109540656B true CN109540656B (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811508825.9A Active CN109540656B (en) | 2018-12-11 | 2018-12-11 | Anti-skid lossless clamp suitable for flexible high-performance fiber bundle and application |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112393988A (en) * | 2020-11-03 | 2021-02-23 | 太原科技大学 | Novel device for thin strip tension bending experiment |
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| JP4439682B2 (en) * | 2000-05-15 | 2010-03-24 | Ｊｓｒ株式会社 | Method for testing mechanical properties of coated fiber and tensile testing machine |
| KR101093797B1 (en) * | 2007-12-28 | 2011-12-19 | 성균관대학교산학협력단 | Clamper for fiber reinforced polymer bar |
| CN107228795A (en) * | 2017-06-02 | 2017-10-03 | 浙江大学 | Composite cryogenic property test fixture component |
| CN108007768A (en) * | 2017-12-08 | 2018-05-08 | 河海大学 | The axis pulling experiment device and test method of a kind of web or pieces of cloth |
| CN109765100A (en) * | 2019-03-05 | 2019-05-17 | 太原理工大学 | A kind of fixture and method detecting fibre strength |
| CN211978521U (en) * | 2020-03-05 | 2020-11-20 | 上海华龙测试仪器有限公司 | Tensile test fixture for glass fiber reinforced cement sample |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204694547U (en) * | 2015-05-12 | 2015-10-07 | 邱锦辉 | A kind of stress test fixture |
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- 2018-12-11 CN CN201811508825.9A patent/CN109540656B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4439682B2 (en) * | 2000-05-15 | 2010-03-24 | Ｊｓｒ株式会社 | Method for testing mechanical properties of coated fiber and tensile testing machine |
| KR101093797B1 (en) * | 2007-12-28 | 2011-12-19 | 성균관대학교산학협력단 | Clamper for fiber reinforced polymer bar |
| CN107228795A (en) * | 2017-06-02 | 2017-10-03 | 浙江大学 | Composite cryogenic property test fixture component |
| CN108007768A (en) * | 2017-12-08 | 2018-05-08 | 河海大学 | The axis pulling experiment device and test method of a kind of web or pieces of cloth |
| CN109765100A (en) * | 2019-03-05 | 2019-05-17 | 太原理工大学 | A kind of fixture and method detecting fibre strength |
| CN211978521U (en) * | 2020-03-05 | 2020-11-20 | 上海华龙测试仪器有限公司 | Tensile test fixture for glass fiber reinforced cement sample |
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