CN109900534B - Carbon fiber bundling sample preparation device and carbon fiber bundling preparation method - Google Patents
Carbon fiber bundling sample preparation device and carbon fiber bundling preparation method Download PDFInfo
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Abstract
The invention discloses a carbon fiber bundling sample preparation device and a preparation method of carbon fiber bundling, wherein the carbon fiber bundling sample preparation device comprises the following components: the device comprises a pre-pressing straightening assembly, a constraint ring assembly and a trimming assembly; the pre-pressing straightening component is used for pressing and straightening carbon fibers forming carbon fiber bundles so as to obtain cylindrical carbon fiber bundles; the confinement ring assembly includes: an upper confinement ring and a lower confinement ring; the upper constraint ring and the lower constraint ring are two semicircular rings in a buckling mode, and after the semicircular rings are butted, a whole circle is formed and used as a constraint ring for constraining carbon fiber bundles; the trimming assembly comprises a clamping device for clamping the constraint ring and a cutter for trimming the clamped carbon fiber bundle. The smoothness and the collimation of the carbon fiber bundling state can be more in line with the experimental requirements through the pre-pressing straightening assembly; the carbon fiber bundling sample can obtain accurate volume density and external dimension through the constraint ring; the sample preparation device can greatly reduce the interference of sample preparation links of samples to experimental results.
Description
Technical Field
The invention relates to a sample preparation device, in particular to a carbon fiber bundling sample preparation device.
Background
Carbon fiber is known as one of the materials with the best comprehensive performance in the industry today. It is a novel carbon material with carbon element mass fraction more than 90% in chemical composition. Carbon fiber and its modified composite material have been widely used in many fields such as aerospace, machine-building, textile, chemical industry, civil engineering and medical and health, no matter the carbon fiber itself or its composite material has great practical application value.
The thermal conductivity is one of important physical parameters for evaluating the thermal properties of the carbon fiber, and the accurate measurement of the axial thermal conductivity of the carbon fiber has important guiding significance for developing, preparing and evaluating the carbon fibers with different thermal properties and the composite materials thereof.
The heat conduction performance of the material is tested by a plurality of methods, and the method can be divided into a steady state method and a transient state method. The steady state method directly measures the heat conductivity coefficient according to the Fourier equation, but the temperature range and the heat conductivity coefficient range are narrower, and the method is mainly suitable for measuring medium-low heat conductivity coefficient materials at medium temperature. The transient rule has a wide application range, and is particularly suitable for testing materials with high heat conductivity coefficient and at high temperature, wherein the fastest development and the most representative method are commonly accepted by the international thermal physics community as a flash method (flash method), and the flash method is also called a laser method or a laser flash method.
The traditional carbon fiber axial thermal conductivity measurement method mainly comprises an electric method such as a direct current electrification method, a T-shaped method, a 3 omega method and the like. However, the radial size of the single carbon fiber is too small (usually only a few micrometers), and the direct and accurate measurement of the thermal conductivity of the single carbon fiber has certain difficulty in each diversity. He Fengmei and the like obtain the thermal diffusivity and the heat conductivity coefficient of the carbon fiber by adopting a laser flash method, and prove the feasibility of measuring the thermal diffusivity of the carbon fiber by adopting the laser flash method.
The current national standard GB/T22588-2008 flash method for measuring thermal diffusivity or thermal conductivity is equivalent to ASTM E1461-2001 Standard Test Method for Thermal Diffusivity by the Flash Method. The test method is suitable for measuring substantially fully dense, homogeneous and isotropic solid materials that are opaque to the applied energy pulse. However, in some cases, acceptable results are also produced when used with porous loose samples. Therefore, for carbon fibers of small radial dimensions and of anisotropic nature, it is necessary to conduct axial thermal conductivity tests of the carbon fibers by means of strict and appropriate experimental design, adapting to certain deviations from these strict guidelines.
ASTM E1461-2013, standard Test Method for Thermal Diffusivity by the Flash Method, requires that the test specimen be generally a circular sheet (i.e., a carbon fiber bundle specimen) with a front surface area that is less than the area of the energy beam. Typically, the test specimens have diameters of 10 to 12.5 mm (in particular, diameters as small as 6 mm and diameters as large as 30 mm have been reported for successful use). The optimal thickness depends on the magnitude of the estimated thermal diffusivity and should be chosen such that the time to reach half the maximum temperature is in the range of 10 to 1000 ms. Thinner specimens are needed at higher temperatures to minimize heat loss correction; however, the sample should generally be thick enough to represent the test material. Typically, the thickness is in the range of 1 to 6 millimeters.
Therefore, when the axial heat conducting performance (thermal diffusivity and heat conductivity) of the carbon fiber is tested by adopting a laser flash method, the carbon fiber is required to be bundled along the radial direction (a plurality of carbon fibers which are axially parallel are arrayed into a cylinder shape), and then a certain length is cut along the axial direction to prepare a circular sheet sample, and the sample and the preparation thereof are key links for measuring the thermal diffusivity by adopting the flash method.
At present, the carbon fiber bundling sample preparation mainly comprises manual sample preparation, namely two persons are matched with tape to wind carbon fibers into a cylinder, then one section of the carbon fiber bundling sample is cut off by a cutter, two end faces of the carbon fiber bundling sample are ground to be round sheets by sand paper, the smoothness inside the carbon fiber bundling sample after the manual sample preparation is insufficient, the conditions of fuzzing and twisting exist, the compactness of a sample changes along with the hand variation, and the accuracy of a test result is influenced. There are also some documents and reports of using a cylindrical holder for sample preparation of carbon fiber bundles, but there are also great problems that either the carbon fiber bundles are difficult to penetrate into the cylindrical holder, or the prepared samples are difficult to reach the standards required by GB/T22588-2008 and ASTM E1461-2013 in terms of external dimensional accuracy, the internal smoothness is insufficient, and the filling rate of the carbon fibers cannot be accurately determined.
Disclosure of Invention
In view of the above, the invention provides a carbon fiber bundling sample preparation device, which can greatly reduce the interference of a sample preparation link of a sample to an experimental result, ensure the accuracy and the repeatability of the experimental link and facilitate the analysis of experimental data and the experimental result in a later period.
The carbon fiber bundling sample preparation device comprises: the device comprises a pre-pressing straightening assembly, a constraint ring assembly and a trimming assembly;
the pre-pressing straightening component is used for pressing and straightening carbon fibers forming carbon fiber bundles so as to obtain cylindrical carbon fiber bundles;
the confinement ring assembly includes: an upper confinement ring and a lower confinement ring; the upper constraint ring and the lower constraint ring are two semicircular rings in a buckling mode, a whole circle is formed after the semicircular rings are in butt joint to serve as constraint rings, and cylindrical carbon fiber bundles are constrained in the constraint rings;
the trimming assembly comprises a clamping device for clamping a constraint ring which is constrained with the carbon fiber bundle and a cutter for trimming the clamped carbon fiber bundle to obtain a carbon fiber bundle sample.
Further, the pre-compression straightening assembly comprises: the device comprises a first bracket, a second bracket, two T-shaped pressing blocks, a guide rail, a positioning nut, a sleeve and a connecting fastener;
u-shaped grooves penetrating through the front end face and the rear end face of the first bracket and the second bracket are machined on the first bracket and the second bracket, and when the first bracket and the second bracket are in butt joint, the two U-shaped grooves are coaxially opposite; the left end and the right end of the U-shaped groove at the bottom of the first bracket and the second bracket are respectively provided with a through hole for installing a guide rail, and the guide rail passes through the through holes at the bottoms of the first bracket and the second bracket and then connects the first bracket and the second bracket in series; one end of the guide rail is fixed on the first bracket through a connecting fastener, and after the other end of the guide rail passes through the second bracket, the extending end of the guide rail is sequentially connected with a sleeve and a positioning nut;
the bottom of the vertical part of the T-shaped pressing block is provided with semicircular grooves, the vertical parts of the two T-shaped pressing blocks are respectively inserted into the U-shaped grooves on the first bracket and the second bracket, and the semicircular grooves at the bottom of the vertical part of the T-shaped pressing block are in butt joint with the semicircular inner concave surfaces at the bottom of the U-shaped grooves to form round holes for placing carbon fiber bundles; the two T-shaped pressing blocks are fixedly connected with the corresponding brackets through connecting fasteners respectively.
Further, the clamping device in the trimming assembly comprises: the device comprises a handle, a bracket tube and a compression ring; the handle is of a hollow pipe structure, and an inner circumferential surface of one end of the handle is provided with an internal thread; one end of the support tube is provided with an external thread matched with the internal thread of the handle, and the handle is coaxially connected with the support tube through threaded connection; the other end is of a semicircular structure; the compression ring is of a semicircular structure with the radius consistent with that of the semicircular structure at the end part of the support pipe; the semicircular structure at the end part of the support tube is butted with the compression ring and fixed to form a tubular structure so as to clamp a constraint ring for constraining carbon fiber bundles; the inside shaft shoulder that is used for carrying out axial spacing to the carbon fiber bundling that is provided with of support pipe.
The preparation method of the carbon fiber bundling sample based on the sample preparation device comprises the following steps:
step one: calculating the mass M of the carbon fiber to be measured required when the set volume filling rate is reached;
step two: compacting carbon fiber bundles
Weighing carbon fibers to be detected with the mass of M to form carbon fiber bundles; horizontally placing carbon fiber bundles in the U-shaped grooves after the first bracket and the second bracket are in butt joint, respectively inserting the vertical parts of two T-shaped pressing blocks into the U-shaped grooves of the first bracket and the second bracket, respectively fixedly connecting the two T-shaped pressing blocks with the corresponding brackets through connecting fasteners, and prepressing the carbon fiber bundles in the U-shaped grooves through the T-shaped pressing blocks;
step three: straightening carbon fiber bundles
Sequentially taking down the positioning nut and the sleeve from the guide rail, and screwing the positioning nut into the guide rail; unscrewing a fastener used for connecting the T-shaped pressing block on the second bracket, enabling the second bracket to move along the guide rail, stopping when the second bracket moves to be in contact with the positioning nut, completing straightening of the carbon fiber bundle, screwing the fastener used for connecting the T-shaped pressing block on the second bracket, and pressing the carbon fiber bundle;
step four: restraint of carbon fiber bundles
Positioning the upper constraint ring through an upper constraint ring positioning component to form an upper constraint ring component, and positioning the lower constraint ring through a lower constraint ring positioning component to form a lower constraint ring component; the upper constraint ring part is arranged in a space between the first bracket and the second bracket from top to bottom, the upper constraint ring and the lower constraint ring are buckled together to form a constraint ring, and the carbon fiber bundle is constrained in the constraint ring;
step six: taking out the carbon fiber bundle constrained by the constraint ring
Removing the T-shaped pressing block and the second bracket, respectively releasing the positioning of the upper constraint ring by the upper constraint ring positioning component, positioning the lower constraint ring by the lower constraint ring positioning component, and taking out the constraint ring with the carbon fiber bundles constrained inside;
step seven: trimming carbon fiber bundles
And clamping the constraint ring by a clamping device in the trimming assembly, and trimming the part, extending out of the constraint ring, of the two ends of the carbon fiber bundle by using a cutter to form a carbon fiber bundle sample with the thickness consistent with that of the constraint ring.
In the first step, the calculation method of the mass M of the carbon fiber to be measured required for achieving the set volume filling rate comprises the following steps:
selecting a bundle of carbon fibers to be detected with the length L and the mass m, and calculating the cross section area S of the single carbon fiber to be detected according to the specific gravity rho of the carbon fibers to be detected by the formula (1) c ：
Calculating the inner hole sectional area S of the constraint ring by the formula (2) according to the inner diameter D of the constraint ring y ：
Setting a volume filling rate K, and obtaining the cross-sectional area S of the carbon fiber bundling sample with the volume filling rate K according to the formula (3):
S＝KS y (3)
from formula (4), S and S are obtained c Is a ratio of:
the mass M of the carbon fiber to be measured required to reach the volume filling rate K is:
in the fourth step, the upper confinement ring positioning means for positioning the upper confinement ring includes: the upper constraint ring bracket, the locating piece B and the locating piece D; one end of the upper constraint ring bracket is of a semicircular structure with the radius consistent with that of the upper constraint ring, the upper constraint ring is placed on the arc surface of the semicircular structure, and the positioning sheet B and the positioning sheet D are respectively arranged on the end surfaces of two sides of the semicircular structure of the upper constraint ring bracket through fastening connectors to clamp the upper constraint ring positioned in the middle of the two;
the structure of the lower confinement ring positioning member for positioning the lower confinement ring is the same as that of the upper confinement ring positioning member.
The beneficial effects are that:
according to the sample preparation device, the preparation process of the carbon fiber bundling sample is standardized, and smoothness and collimation of a carbon fiber bundling state can be more in accordance with experimental requirements through the pre-pressing straightening assembly; the carbon fiber bundling sample can obtain accurate volume density and external dimension through the constraint ring; through carbon fiber sample device side cut subassembly tied in a bundle, can avoid sample surface (sand hole, mar, stripe) inhomogeneous, adopt this sample preparation device can be very big the interference of the system appearance link of reduction sample to the experimental result, guarantee the accuracy and the repeatability of experimental link, be convenient for later stage to the analysis of experimental data and experimental result, be favorable to measuring the application in popularization of carbon fiber axial thermal diffusivity with the flash of light method.
Drawings
FIG. 1 is a schematic diagram of a pre-compression straightening assembly of a carbon fiber bundling sample preparation device;
FIG. 2 is a left side view of a pre-compression straightening assembly of the carbon fiber bundling sample preparation device;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a cross-sectional view B-B of FIG. 2;
FIG. 5 is a cross-sectional view of C-C of FIG. 2;
FIG. 6 is a D-D sectional view of FIG. 2;
FIG. 7 is an enlarged view of a portion of FIG. 3 at I;
FIG. 8 is a schematic view of an upper confinement ring configuration;
FIG. 9 is a schematic view of a lower confinement ring configuration;
FIG. 10 is a schematic view of the upper and lower confinement rings in an operative position;
FIG. 11 is a schematic view of an upper confinement ring positioning member;
FIG. 12 is a schematic view of a lower confinement ring positioning member;
FIG. 13 is a schematic view of the clamping device in the trimming assembly;
FIG. 14 is a schematic diagram of a straightened carbon fiber bundle sample;
FIG. 15 is a schematic view of an upper confinement member incorporating an upper confinement ring;
FIG. 16 is a schematic view of a lower confinement member incorporating a lower confinement ring;
fig. 17 is a schematic diagram of the working principle of the carbon fiber bundling sample preparation device.
Wherein: 1-a hexagon head bolt; 2-T-shaped pressing blocks; 3-a first scaffold; 4-screw a; 5-positioning a nut; 6, a guide rail; 7-a lower confinement ring bracket; 8-locating piece A; 9-screw B; 10-locating piece B; 11-upper confinement ring holder; 12-locating piece C; 13-locating piece D; 14-a second bracket; 15-an upper confinement ring; 16-a lower confinement ring; 17-sleeve; 18-a handle; 19-a stent tube; 20-a compression ring; 21-screw C, 22-carbon fiber bundle
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The embodiment provides a carbon fiber bundling sample preparation device, which is used for preparing a carbon fiber bundling sample, and the carbon fiber bundling sample prepared by the device can be used for measuring the axial thermal diffusivity of carbon fibers by a flash method.
The carbon fiber bundling sample preparation device comprises a pre-pressing straightening assembly, a constraint ring assembly and a trimming assembly.
As shown in fig. 1 to 6, the pre-compression straightening assembly includes: the device comprises a first bracket 3, a second bracket 14, two T-shaped pressing blocks 2, a guide rail 6, a positioning nut 5, a sleeve 17 and a connecting fastener; wherein the coupling fastener comprises a hex head bolt 1 and a screw A4.
The connection relation is as follows: u-shaped grooves penetrating through the front end face and the rear end face of the first bracket 3 and the second bracket 14 are formed in the first bracket 3 and the second bracket 14, and when the first bracket 3 and the second bracket 14 are in parallel butt joint, the positions of the two U-shaped grooves are opposite. The front end face of the first bracket 3 is abutted with the rear end face of the second bracket 14, in order to realize the accurate abutting joint of the two U-shaped grooves, the left end and the right end of the U-shaped groove on the front end face of the first bracket 3 are respectively provided with a strip-shaped boss along the height direction, and the left end and the right end of the U-shaped groove on the rear end face of the second bracket 14 are respectively provided with a strip-shaped groove matched with the strip-shaped boss; and the left and right ends of the U-shaped grooves at the bottoms of the first bracket 3 and the second bracket 14 are respectively provided with a through hole for installing the guide rail 6, the guide rail 6 penetrates through the through holes at the bottoms of the first bracket 3 and the second bracket 14, the first bracket 3 and the second bracket 14 are connected together, the rear end of the guide rail 6 is fixed on the first bracket 3 through a screw A4, and after the front end penetrates through the second bracket 14, the sleeve 17 and the positioning nut 5 are sequentially connected on the extending end of the guide rail 6, so that the strip-shaped boss on the first bracket 3 is tightly combined with the strip-shaped groove of the second bracket 14, and the planes of the U-shaped groove on the first bracket 3 and the U-shaped groove on the second bracket 14 are completely coplanar with the curved surface along the axial direction of the guide rail.
The bottom of the vertical part of the T-shaped pressing block 2 is provided with a semicircular groove, the bottom surface of the semicircular groove is concave semicircular arc, the width of the vertical part of the T-shaped pressing block 2 is slightly smaller than that of the U-shaped groove, the vertical parts of the two T-shaped pressing blocks 2 are respectively inserted into the U-shaped grooves on the first bracket 3 and the second bracket 14, and the semicircular groove at the bottom of the vertical part of the T-shaped pressing block 2 is in butt joint with the semicircular concave surface at the bottom of the U-shaped groove to form a circular groove for placing carbon fiber bundles. The T-shaped pressing block 2 is fixedly connected with the corresponding bracket through hexagon head bolts 1 at two ends of the horizontal part of the T-shaped pressing block, and the pre-pressing of the carbon fiber bundle in the U-shaped groove is realized through the T-shaped pressing block 2.
The confinement ring assembly includes: a confinement ring, an upper confinement ring positioning member, and a lower confinement ring positioning member. As shown in fig. 8-10, the constraint ring is formed by butting two semicircular rings in a fastening mode, the two semicircular rings are an upper constraint ring 15 and a lower constraint ring 16 respectively, the upper constraint ring 15 and the lower constraint ring 16 are butted to form a whole circle, the upper constraint ring 15 and the lower constraint ring 16 are connected in a fastening mode at the butting position, so that the upper constraint ring and the lower constraint ring cannot be separated along the radial direction, and the carbon fiber bundles are constrained in the constraint ring.
As shown in fig. 11, the upper confinement ring positioning member includes: the upper confinement ring bracket 11, the locating piece B10, the locating piece D13 and the connecting fastener, wherein the connecting fastener is a screw B9. One end of the upper constraint ring bracket 11 is of a semicircular structure consistent with the arc shape of the upper constraint ring 15, the upper constraint ring 15 is placed on the arc surface of the semicircular structure, the positioning sheets B10 and D13 are respectively installed on the end surfaces of two sides of the semicircular structure of the upper constraint ring bracket 11 through the screws B9, the upper constraint ring 15 positioned in the middle of the positioning sheets B10 and D13 is clamped, and the upper constraint ring 15 is positioned, so that the axial and radial displacement of the upper constraint ring 15 is limited through the positioning sheets B10, D13 and the arc surface of the semicircular structure, and the upper constraint ring 15 is prevented from rotating and falling off from the upper constraint ring bracket 11.
The lower confinement ring positioning member has the same structure as the upper confinement ring positioning member, and as shown in fig. 12, specifically includes: the lower confinement ring bracket 7, the locating piece A8, the locating piece C12 and the coupling fastener, wherein the coupling fastener is a screw B9. One end of the lower constraint ring bracket 7 is of a semicircular structure consistent with the arc shape of the lower constraint ring 16, the lower constraint ring 16 is placed on the arc surface of the semicircular structure, the positioning sheet A8 and the positioning sheet C12 are respectively installed on two side end surfaces of the semicircular structure of the lower constraint ring bracket 7 through the bolts B9, the lower constraint ring 16 positioned in the middle of the positioning sheet A8 and the positioning sheet C12 is clamped, and the positioning of the lower constraint ring 16 is realized, so that the axial and radial displacement of the lower constraint ring 16 is limited through the positioning sheet A8, the positioning sheet C12 and the arc surface of the semicircular structure, and the lower constraint ring 16 is prevented from rotating and falling off from the lower constraint ring bracket 7.
As shown in fig. 13, the trimming assembly is used for clamping a clamping device of a constraint ring which constrains a carbon fiber bundle and a cutter for trimming the clamped carbon fiber bundle to obtain a carbon fiber bundle sample. Wherein the clamping device includes: a handle 18, a bracket tube 19, a pressure ring 20 and a screw C21. Wherein the handle 18 is of a hollow tube structure, and an inner circumferential surface of one end is provided with an internal thread; the bracket tube 19 is of a hollow stepped hole structure, one end of the bracket tube is provided with external threads matched with the internal threads of the handle 18, and the handle 18 and the bracket tube 19 are coaxially connected through threaded connection; the other end of the bracket tube 19 is of a semicircular structure, and two radial ends of the semicircular structure are provided with bosses; the compression ring 20 has a semicircular structure with the radius identical to that of the semicircular structure at the end part of the support pipe 19, and two radial ends of the compression ring are also provided with bosses. Wherein the inner diameter of the semicircular structure at the end of the bracket tube 19 is slightly smaller than or equal to the outer diameter of the constraint ring (the constraint ring can be clamped when the semicircular structure is matched with the constraint ring), and the inner hole radius of the externally threaded part is smaller than the inner hole radius of the boss part, so that a shaft shoulder is formed inside the bracket tube 19. After the constraint ring with the carbon fiber bundles is placed inside the semicircular structure at the end part of the support pipe 19, the compression ring 20 is abutted with the semicircular structure at the end part of the support pipe 19 and is fastened and connected through the screw C21 on the shaft shoulder, so that the buckled constraint ring with the carbon fiber bundles is clamped by the tubular structure formed by the cooperation of the semicircular structure at the end part of the support pipe 19 and the compression ring 20.
The prepared carbon fiber bundling sample for testing the axial heat conducting performance comprises a constraint ring and carbon fiber bundles constrained in the constraint ring, wherein the carbon fiber bundles are cylindrical formed by arranging a plurality of carbon fibers to be tested which are axially parallel.
The process for preparing the carbon fiber bundling sample by adopting the carbon fiber sample preparation device comprises the following steps:
(1) Calculating the mass M of the required carbon fiber bundle
The carbon fiber bundles are as compact as possible in the constraint ring, and can theoretically reach a volume filling rate of 80% at most, and the volume filling rate is preferably 50% -80%, preferably higher.
Selecting a bundle of carbon fibers to be detected with the length L and the mass m, and calculating the cross section area S of the single carbon fiber to be detected according to the specific gravity rho of the carbon fibers to be detected by the formula (1) c ：
Calculating the inner hole sectional area S of the constraint ring according to the inner diameter D of the constraint ring by the method (2) y ：
Setting a volume filling rate K, and obtaining the cross-sectional area S of the carbon fiber bundle with the volume filling rate K by the formula (3):
S＝KS y (3)
from formula (4), S and S are obtained c Is a ratio of:
the mass of carbon fibers required to reach the volume filling rate K is: m=Φm.
(2) Compacting carbon fiber bundles
The carbon fiber to be measured with the mass of M is weighed to form a carbon fiber bundle, the carbon fiber bundle is horizontally placed in U-shaped grooves formed by coplanarity after the butt joint of the first support 3 and the second support 14, semicircular grooves on the two T-shaped pressing blocks 2 are downwards inserted into the U-shaped grooves of the first support 3 and the second support 14 respectively, and the carbon fiber bundle is pre-pressed through the T-shaped pressing blocks 2 by screwing into hexagon head bolts.
(3) Straightening carbon fiber bundles
The positioning nut 5 and the sleeve 17 are removed from the guide rail 6 in sequence, and then the positioning nut 5 is screwed into the guide rail 6. As shown in fig. 14, the hexagonal bolt 1 on the second bracket 14 is unscrewed until the second bracket 14 and the T-shaped pressing block 2 can move forward along the guide rail 6, stop when moving to be tightly attached to the positioning nut 5, finish straightening the carbon fiber bundle, and screw the hexagonal bolt 1 on the second bracket 14 to press the carbon fiber bundle.
(4) Assembling confinement ring members
As shown in fig. 15, the upper confinement ring 15 is placed in the semicircular groove of the upper confinement ring bracket 11, and since the thickness of the semicircular groove of the upper confinement ring bracket 11 is slightly smaller than that of the upper confinement ring 15, the positioning pieces B10 and D13 are respectively mounted on two sides of the upper confinement ring bracket 11 through the screws B9, so that the upper confinement ring 15 can be clamped and positioned, and the upper confinement ring 15 and the upper confinement ring positioning member are assembled to form an upper confinement ring member.
As shown in fig. 16, the lower confinement ring 16 is placed in the semicircular groove of the lower confinement ring bracket 7, and since the thickness of the semicircular groove portion of the lower confinement ring bracket 7 (the same as the thickness of the semicircular groove portion of the upper confinement ring 15) is slightly smaller than the thickness of the lower confinement ring 16, the clamping and positioning of the lower confinement ring 16 can be achieved by mounting the positioning pieces A8, C12 on both sides of the lower confinement ring bracket 7 by the screws B9, respectively. The lower confinement ring 16 and the lower confinement ring positioning member are assembled to form a lower confinement ring member.
(5) Restraint of carbon fiber bundles
As shown in fig. 17, the upper confinement ring member is fitted into the space between the first bracket 3 and the second bracket 14 from top to bottom, with the semicircular grooves of the upper confinement ring bracket 11 and the lower confinement ring bracket 7 being opposed; in order to achieve the guiding of the upper and lower confinement ring members, the widths of the upper and lower confinement ring brackets 11, 7 are designed to be identical to the distance between the two strip-shaped protrusions on the first bracket 3, so that the upper and lower confinement ring members can be vertically butted by guiding the upper and lower confinement ring members through the two strip-shaped protrusions on the first bracket 3. In actual operation, the bottom surfaces of the lower constraint ring part, the first bracket 3 and the second bracket 14 are placed on an operation platform, a certain pressure is applied to the upper constraint ring part from the upper side until the top of the upper constraint ring part and the top surface of the T-shaped pressing block 2 are in the same horizontal plane, and at the moment, the upper constraint ring 15 and the lower constraint ring 16 are buckled together to form a constraint ring, so that the constraint of the constraint ring on carbon fiber bundles is realized.
(6) Taking out the carbon fiber bundle constrained by the constraint ring
Loosening the hexagon head bolt 1 and removing the T-shaped pressing block 2; the positioning nut 5 is loosened and the second bracket 14 is removed from the guide rail 6. And loosening the fastening screws on the positioning sheets on the same side on the upper constraint ring part and the lower constraint ring part in sequence so as to take out the carbon fiber bundles constrained by the constraint rings.
(7) Preparation of carbon fiber bundling sample is completed
And extending the carbon fiber bundles which are taken out and restrained by the restraint rings out of the carbon fiber bundles with longer ends of the restraint rings, and properly cutting short the carbon fiber bundles so as to facilitate subsequent trimming. As shown in fig. 13, the carbon fiber bundle to be trimmed is placed in a semicircular structure at the end of the support tube 19 of the trimming tool, the axis direction of the carbon fiber bundle is positioned by a step Kong Zhoujian inside the support tube 19, the compression ring 20 is abutted and fixed with the semicircular structure at the end of the support tube 19 by the screw 21, the buckled constraint ring filled with the carbon fiber bundle is clamped by the formed tubular structure, and the redundant carbon fibers are cut off by a cutter against the edge of the end of the constraint ring. After the completion, the trimming of the carbon fiber bundle at the other end of the constraint ring is completed by the method, thereby forming the carbon fiber bundle sample consistent with the thickness of the constraint ring.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A carbon fiber bundling sampling device, comprising: the device comprises a pre-pressing straightening assembly, a constraint ring assembly and a trimming assembly;
the pre-pressing straightening component is used for pressing and straightening carbon fibers forming carbon fiber bundles so as to obtain cylindrical carbon fiber bundles;
the confinement ring assembly includes: an upper confinement ring (15), a lower confinement ring (16), an upper confinement ring positioning member, and a lower confinement ring positioning member; the upper constraint ring (15) and the lower constraint ring (16) are two semicircular rings in a buckling mode, a whole circle is formed after the semicircular rings are in butt joint to serve as constraint rings, and cylindrical carbon fiber bundles are constrained in the constraint rings;
the upper confinement ring positioning means for positioning the upper confinement ring (15) comprises: an upper confinement ring bracket (11), a locating piece B (10) and a locating piece D (13); one end of the upper constraint ring bracket (11) is of a semicircular structure consistent with the radius of the upper constraint ring (15), the upper constraint ring (15) is placed on the arc surface of the semicircular structure, and the positioning sheet B (10) and the positioning sheet D (13) are respectively arranged on the end surfaces of two sides of the semicircular structure of the upper constraint ring bracket (11) through fastening connectors to clamp the upper constraint ring (15) positioned in the middle of the two;
the structure of the lower confinement ring positioning member for positioning the lower confinement ring (16) is the same as that of the upper confinement ring positioning member;
the trimming assembly comprises a clamping device for clamping a constraint ring which is used for constraining the carbon fiber bundle and a cutter for trimming the clamped carbon fiber bundle to obtain a carbon fiber bundle sample;
the clamping device in the trimming assembly comprises: a handle (18), a bracket tube (19) and a compression ring (20); the handle (18) is of a hollow pipe structure, and an inner circumferential surface of one end of the handle is provided with an inner thread; one end of the bracket tube (19) is provided with external threads matched with the internal threads of the handle (18), and the handle (18) and the bracket tube (19) are coaxially connected through threaded connection; the other end is of a semicircular structure; the compression ring (20) is of a semicircular structure with the radius consistent with that of the semicircular structure at the end part of the bracket tube (19); the semicircular structure at the end part of the bracket tube (19) is butted with the compression ring (20) and fixed to form a tubular structure so as to clamp a constraint ring for constraining carbon fiber bundles; a shaft shoulder for axially limiting the carbon fiber bundles is arranged in the support tube (19);
the pre-compression straightening assembly comprises: the device comprises a first bracket (3), a second bracket (14), two T-shaped pressing blocks (2), a guide rail (6), a positioning nut (5), a sleeve (17) and a connecting fastener;
u-shaped grooves penetrating through the front end face and the rear end face of the first bracket (3) and the second bracket (14) are formed in the first bracket (3) and the second bracket (14), and when the first bracket (3) and the second bracket (14) are in butt joint, the two U-shaped grooves are coaxial and opposite; the left end and the right end of the U-shaped groove at the bottom of the first bracket (3) and the second bracket (14) are respectively provided with a through hole for installing a guide rail (6), and after the guide rail (6) passes through the through holes at the bottoms of the first bracket (3) and the second bracket (14), the first bracket (3) and the second bracket (14) are connected in series; one end of the guide rail (6) is fixed on the first bracket (3) through a connecting fastener, and after the other end passes through the second bracket (14), a sleeve (17) and a positioning nut (5) are sequentially connected to the extending end of the guide rail;
the bottoms of the vertical parts of the T-shaped pressing blocks (2) are provided with semicircular grooves, the vertical parts of the two T-shaped pressing blocks (2) are respectively inserted into the U-shaped grooves on the first bracket (3) and the second bracket (14), and the semicircular grooves at the bottoms of the vertical parts of the T-shaped pressing blocks (2) are in butt joint with the semicircular inner concave surfaces at the bottoms of the U-shaped grooves to form round holes for placing carbon fiber bundles; the two T-shaped pressing blocks (2) are fixedly connected with the corresponding brackets through connecting fasteners respectively.
2. The carbon fiber bundling sample preparing device according to claim 1, characterized in that strip-shaped bosses along the height direction of the U-shaped groove are respectively processed at the left and right ends of the U-shaped groove on the opposite end surfaces of the first bracket (3) and the second bracket (14);
on the end surface of the second bracket (14) opposite to the first left bracket (3), the left and right ends of the U-shaped groove are respectively processed with a strip-shaped groove matched with the strip-shaped boss;
the strip-shaped lug boss and the strip-shaped groove are butt joint positioning surfaces of the first bracket (3) and the second bracket (14), and when the first bracket (3) and the second bracket (14) are in butt joint, the strip-shaped lug boss on the first bracket (3) is positioned in the strip-shaped groove of the second bracket (14), so that each plane and each curved surface of the two U-shaped grooves are guaranteed to be axially coplanar along the guide rail (6).
3. A method for preparing a carbon fiber bundling sample, which adopts the carbon fiber bundling sample preparation device according to claim 1 or 2, and is characterized in that:
step one: calculating the mass M of the carbon fiber to be measured required when the set volume filling rate is reached;
the calculation method of the mass M of the carbon fiber to be measured required for achieving the set volume filling rate comprises the following steps:
selecting a bundle of carbon fibers to be detected with the length L and the mass m, and calculating the cross section area S of the single carbon fiber to be detected according to the specific gravity rho of the carbon fibers to be detected by the formula (1) c ：
Calculating the inner hole sectional area S of the constraint ring by the formula (2) according to the inner diameter D of the constraint ring y ：
Setting a volume filling rate K, and obtaining the cross-sectional area S of the carbon fiber bundling sample with the volume filling rate K according to the formula (3):
S＝KS y (3)
from formula (4), S and S are obtained c Is a ratio of:
the mass M of the carbon fiber to be measured required to reach the volume filling rate K is:
step two: compacting carbon fiber bundles
Weighing carbon fibers to be detected with the mass of M to form carbon fiber bundles; placing carbon fiber bundles horizontally in U-shaped grooves formed by butting a first bracket (3) and a second bracket (14), respectively inserting two T-shaped pressing blocks (2) vertically into the U-shaped grooves of the first bracket (3) and the second bracket (14), respectively fixedly connecting the two T-shaped pressing blocks (2) with the corresponding brackets through connecting fasteners, and prepressing the carbon fiber bundles in the U-shaped grooves through the T-shaped pressing blocks (2);
step three: straightening carbon fiber bundles
Sequentially removing the positioning nut (5) and the sleeve (17) from the guide rail (6), and screwing the positioning nut (5) on the guide rail (6); loosening a fastener used for connecting the T-shaped pressing block (2) on the second bracket (14), enabling the second bracket (14) to move along the guide rail (6), stopping when the second bracket moves to be in contact with the positioning nut (5), completing straightening of the carbon fiber bundle, screwing the fastener used for connecting the T-shaped pressing block (2) on the second bracket (14), and compacting the carbon fiber bundle;
step four: restraint of carbon fiber bundles
Positioning the upper confinement ring (15) by an upper confinement ring positioning member to form an upper confinement ring member, and positioning the lower confinement ring (16) by a lower confinement ring positioning member to form a lower confinement ring member; loading the upper constraint ring part from top to bottom and the lower constraint ring part from bottom to top into a space between the first bracket (3) and the second bracket (14), buckling the upper constraint ring (15) and the lower constraint ring (16) together to form a constraint ring, and constraining the carbon fiber bundle in the constraint ring;
step five: taking out the constraint ring with carbon fiber bundles constrained inside
Removing the T-shaped pressing block (2) and the second bracket (14), respectively releasing the positioning of the upper constraint ring (15) by the upper constraint ring positioning component, positioning the lower constraint ring (16) by the lower constraint ring positioning component, and taking out the constraint ring with the carbon fiber bundles constrained inside;
step six: trimming carbon fiber bundles
And clamping the constraint ring by a clamping device in the trimming assembly, and trimming the part, extending out of the constraint ring, of the two ends of the carbon fiber bundle by using a cutter to form a carbon fiber bundle sample with the thickness consistent with that of the constraint ring.
4. The method for preparing a carbon fiber bundle sample according to claim 3, wherein strip-shaped bosses along the height direction of the U-shaped groove are respectively processed at the left and right ends of the U-shaped groove on the opposite end surfaces of the first left bracket (3) and the second bracket (14);
on the end surface of the second bracket (14) opposite to the first left bracket (3), the left and right ends of the U-shaped groove are respectively processed with a strip-shaped groove matched with the strip-shaped boss;
the strip-shaped lug boss and the strip-shaped groove are butt joint positioning surfaces of the first bracket (3) and the second bracket (14), and when the first bracket (3) and the second bracket (14) are in butt joint, the strip-shaped lug boss on the first bracket (3) is positioned in the strip-shaped groove of the second bracket (14);
the width of the upper constraint ring bracket (11) and the width of the lower constraint ring bracket (7) are consistent with the distance between the two strip-shaped protrusions on the first bracket (3), and in the fourth step, the upper constraint ring part is arranged between the first bracket (3) and the second bracket (14) from top to bottom, and the upper constraint ring part and the lower constraint ring part are guided through the two strip-shaped protrusions when the lower constraint ring part is arranged between the first bracket (3) and the second bracket (14) from bottom to top.
5. The method of claim 3, wherein in the sixth step, before the restraining ring is held by the holding device in the trimming assembly, the portions of the two ends of the carbon fiber bundle extending out of the restraining ring are cut to a predetermined length.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910144963.1A CN109900534B (en) | 2019-02-27 | 2019-02-27 | Carbon fiber bundling sample preparation device and carbon fiber bundling preparation method |
| PCT/CN2020/085828 WO2020173508A1 (en) | 2019-02-27 | 2020-04-21 | Carbon fibre bundle sample preparation apparatus, and preparation method for carbon fibre bundle |
| EP20763573.1A EP3957972A4 (en) | 2019-02-27 | 2020-04-21 | Carbon fibre bundle sample preparation apparatus, and preparation method for carbon fibre bundle |
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| CN201910144963.1A CN109900534B (en) | 2019-02-27 | 2019-02-27 | Carbon fiber bundling sample preparation device and carbon fiber bundling preparation method |
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