Carbon fiber multifilament sample clamping device

Abstract

The utility model discloses a carbon fiber multifilament sample clamping device which comprises a first pressure plate, a second pressure plate, a plurality of first sliding blocks, a plurality of second sliding blocks and a plurality of second sliding blocks. The first clamping jaw is provided with a clamping face, the first clamping jaw is provided with a first sliding way matched with the first sliding block, and the first clamping jaw is provided with a second sliding way; a limiting hole is formed in the first check block, and a second sliding block matched with the second sliding way is arranged on the first check block. Compared with the prior art, according to the carbon fiber multifilament sample clamping device, a sample piece is clamped through the multiple clamping jaws, and compared with a traditional universal clamping block, the clamping device has the advantages that clamping force is evenly dispersed, local pressure intensity is reduced, the sample piece is prevented from being broken at the clamping position in advance in the testing process, and meanwhile when the sample piece is clamped, the sample piece is not prone to breakage. The fiber multifilament sample and the central shaft are collinear, centering is completed while the sample piece is clamped, and an additional centering device is not needed.

Description

Technical Field

[0001] The utility model belongs to the field of carbon fiber testing, in particular to a carbon fiber multifilament sample clamping device. Background Art

[0002] Carbon fiber is a high-strength, high-modulus, high-temperature resistant special fiber with a carbon content greater than 90%. It uses polyacrylonitrile (PAN), asphalt, viscose fiber, etc. as raw materials and is made through pre-oxidation, carbonization, graphitization and other processes. Among them, PAN-based carbon fiber has developed rapidly and has become the main type of carbon fiber.

[0003] When carbon fiber is used as a structural material, the mechanical properties of multifilament can more intuitively evaluate the quality of carbon fiber. It is currently the most common material performance assessment indicator for carbon fiber manufacturers and application units. However, how to accurately test the mechanical properties of carbon fiber multifilament has always been a difficult problem.

[0004] During the testing phase, clamping the carbon fiber multifilament sample is key. The traditional clamping method involves attaching reinforcement sheets to both ends of the carbon fiber multifilament sample, using a universal two-sided clamp, and clamping the sample manually, hydraulically, or pneumatically. This traditional method has many drawbacks: The carbon fiber multifilament sample is approximately cylindrical, and clamping it with two planes close to each other creates a high pressure at the contact point between the sample and the clamp, damaging the sample. This can cause premature breakage at the clamping site during testing, and the test results generally show low strength. The sample cannot be effectively aligned when clamped by two planes, requiring the addition of an auxiliary centering device, which generally has low accuracy. Utility Model Content

[0005] The purpose of the utility model is to provide a carbon fiber multifilament sample clamping device, which clamps the sample through multiple claws. Compared with traditional general clamping blocks, the advantage is that the clamping force is evenly dispersed, the local pressure is reduced, and the sample is prevented from breaking prematurely at the clamping position during the test process. At the same time, when the sample is clamped, the fiber multifilament sample is collinear with the central axis, and the sample is aligned while being clamped, without the need for an additional centering device.

[0006] To achieve the above-mentioned purpose, the utility model provides a carbon fiber multifilament sample clamping device, comprising: a first pressure plate, a plurality of circular holes are provided on the first pressure plate, and a plurality of first sliders are provided on the first pressure plate; a first clamping jaw, a clamping surface is provided on the first clamping jaw, a first slide matching the first slider is provided on the first clamping jaw, and a second slide is provided on the first clamping jaw; a first stop block, a limiting hole is provided in the first stop block, a second slider matching the second slide is provided on the first stop block, the second sliders are distributed on the hole wall of the limiting hole, and the number of the second sliders is at least two; and also includes a tensile machine head, the tensile machine head includes a hydraulic column, a chuck and a limiting rod, and the tensile machine head can push the first clamping jaw to slide along the second slider.

[0007] In one or more embodiments, the first slider, the first slideway, the second slideway, and the second slider have trapezoidal cross-sections.

[0008] In one or more embodiments, a spring is fixedly connected between the circular hole and the limiting rod.

[0009] In one or more embodiments, a limiting groove is provided on the limiting rod, and a spring fixedly connected to the limiting rod is located in the limiting groove.

[0010] In one or more embodiments, a support rod is further included, wherein the support rod includes a threaded rod, and both ends of the threaded rod are threadedly connected to the support rod.

[0011] In one or more embodiments, a second pressure plate, a second claw, and a second stopper are further included.

[0012] In one or more embodiments, a third pressure plate is further included, wherein the third pressure plate includes a sleeve matched with the hydraulic cylinder.

[0013] In one or more embodiments, a plurality of threaded holes are formed in the sleeve, and fixing bolts are threadedly connected in the threaded holes.

[0014] In one or more embodiments, the number of the second sliding blocks is at least two.

[0015] In one or more embodiments, the clamping surface is provided with a frosted surface.

[0016] Compared with the existing technology, a carbon fiber multifilament sample clamping device according to the utility model clamps the sample through multiple claws. Compared with the traditional general clamping block, its advantage is that the clamping force is evenly dispersed, the local pressure is reduced, and the sample is prevented from breaking prematurely at the clamping position during the test process. At the same time, when the sample is clamped, the fiber multifilament sample is collinear with the center axis, and the sample is aligned while being clamped, without the need for an additional centering device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the carbon fiber multifilament sample clamping device of the utility model;

[0018] Figure 2 This is a schematic diagram of the pressure plate of the utility model;

[0019] Figure 3 This is a schematic diagram of the clamping claw of the utility model;

[0020] Figure 4 This is a schematic diagram of the stopper of the utility model;

[0021] Figure 5 This is a schematic diagram of the support rod of the utility model;

[0022] Figure 6 This is a schematic diagram of the chuck of the tensile testing machine of the utility model;

[0023] Figure 7 This is a schematic diagram of a carbon fiber multifilament sample clamping device according to Example 2 of the present utility model;

[0024] Figure 8 This is a schematic diagram of the pressure plate of the carbon fiber multifilament sample clamping device in Example 3 of the present utility model.

[0025] Description of main reference numerals:

[0026] 1-first pressure plate, 11-first slider, 12-round hole, 2-first claw, 21-clamping surface, 22-first slide, 23-second slide, 3-first stopper, 31-second slider, 32-limiting hole, 51-support rod, 52-threaded rod, 61-hydraulic column, 62-chuck, 63-limiting rod, 64-limiting groove, 71-second pressure plate, 72-second claw, 73-second stopper, 8-third pressure plate, 81-threaded hole, 82-sleeve, 83-fixing bolt. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0028] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0029] Example 1

[0030] like Figures 1 to 6As shown, a carbon fiber multifilament sample clamping device according to one embodiment of the present invention includes a first pressure plate 1, a first clamping jaw 2, and a first stopper 3. The first pressure plate 1 is provided with a plurality of first sliders 11, and a plurality of circular holes 12 are formed on the first pressure plate 1. The first clamping jaw 2 is provided with a first slideway 22, a second slideway 23, and a clamping surface 21 that match the first sliders 11. A limiting hole 32 is defined in the first stopper 3, and the first stopper 3 is provided with a second slider 31 that matches the second slideway 23. The number of second sliders 31 is at least two.

[0031] That is, the number of the claws is also at least two, and the claws are evenly distributed 360° around the central axis of the first pressure plate 1 and the first stopper 3. When there are two claws, the angle between adjacent claws is 180°; when there are three claws, the angle between adjacent claws is 120°; when there are four claws, the angle between adjacent claws is 90°, and so on.

[0032] Specifically, the first pressure plate 1 and the first clamping jaw 2 are connected via a first slider 11 inserted into a first slideway 22. The first clamping jaw 2 and the first stopper 3 are connected via a second slider 31 inserted into a second slideway 23. Both the slider and the slideway have trapezoidal cross-sections, providing guidance and position limiting functions. The clamping surface 21 is frosted, meaning it is polished, ensuring a more stable and secure grip on the sample and preventing it from loosening.

[0033] Ginseng Figure 6 As shown, the tensile machine chuck includes a hydraulic column 61 , a chuck 62 and a limiting rod 63 .

[0034] Ginseng Figure 5 As shown, the support rod includes a threaded rod 52 and a support rod 51.

[0035] Specifically, the stopper 3 is inserted into the chuck 62 of the tensile testing machine, and the support rod 51 is placed in the gap between the upper surface of the stopper 3 and the chuck 62. The threaded rod 52 is rotated, and the support rod 51 is axially expanded to press against the stopper 3. The four circular holes 12 of the pressure plate 1 are connected to springs, the other ends of which are connected to the limit rods 63 and located in the limit slots 64, i.e., the other ends of the springs are not easily detached from the limit rods 63.

[0036] When the hydraulic column 61 extends, pressure is transmitted to the first jaw 2 through the first pressure plate 1. Because the limiting hole 32 is a tapered hole that is wider at the top and narrower at the bottom, the second slider 31 is evenly distributed on the wall of the limiting hole 32. This allows the clamping surfaces 21 of the first jaw 2 to simultaneously approach the central axis at the same speed, clamping the sample. When the hydraulic column 61 contracts, the spring connecting the limiting rod 63 and the circular hole 12 contracts, driving the first pressure plate 1 to move the clamping surfaces 21 of the first jaw 2 away from each other, releasing the sample.

[0037] Example 2

[0038] A schematic diagram of a carbon fiber multifilament sample clamping device is shown in FIG. Figure 7 As shown, it includes a second pressure plate 71, a second clamping claw 72 and a second stopper 73. The number of the second clamping claws 72 is three. Figure 6 Schematic diagram of the chuck of the tensile testing machine, including a hydraulic column 61, a chuck 62, and a limit rod 63. Figure 5 Schematic diagram of a support rod, including a threaded rod 52 and a support rod 51.

[0039] The second stopper 73 is inserted into the chuck 62 of the tensile testing machine, and the support rod 51 is placed in the gap between the upper surface of the second stopper 73 and the chuck 62. The threaded rod 52 is rotated, and the support rod 51 is axially expanded to press against the second stopper 73. The four circular holes of the second pressure plate 71 are connected to springs, and the other end of the spring is connected to the limit rod 63.

[0040] When the hydraulic cylinder 61 extends, pressure is transmitted to the second jaw 72 via the second pressure plate 71. The clamping surfaces of the second jaw 72 simultaneously approach the central axis at the same speed, clamping the sample. When the hydraulic cylinder 61 contracts, the spring connecting the limit rod 63 and the circular hole in the second pressure plate 71 contracts, driving the second pressure plate 71 to move the clamping surfaces of the second jaw 72 away from each other, releasing the sample.

[0041] Example 3

[0042] A schematic diagram of a pressure plate of a carbon fiber multifilament sample clamping device is shown in FIG. Figure 8 As shown, the third pressure plate 8 includes a sleeve 82 that matches the hydraulic column 61. A plurality of threaded holes 81 are opened in the sleeve 82, and fixing bolts 83 are threadedly connected to the threaded holes 81.

[0043] use Figure 8 The third pressure plate 8 shown replaces Figure 1 The first pressure plate 1 of the device or Figure 7 The second pressure plate 71 of the device. Figure 6 Schematic diagram of the chuck of the tensile testing machine, including a hydraulic column 61, a chuck 62, and a limit rod 63. Figure 5 Schematic diagram of a support rod, including a threaded rod 52 and a support rod 51.

[0044] The first stopper 3 or the second stopper 73 is inserted into the chuck 62 of the tensile testing machine, and the support rod 51 is placed in the gap between the upper surface of the stopper 3 and the chuck 62. The threaded rod 52 is rotated, and the support rod 51 is stretched axially to press against the first stopper 3 or the second stopper 73. Figure 8 The pressure plate shown is sleeved on the hydraulic column 61 of the tensile machine, and the fixing screw 81 is tightened to fix the hydraulic column 61 and the sleeve 82 together.

[0045] The hydraulic column 61 is extended, and the pressure is applied through the Figure 8 The pressure plate is transmitted to the first clamping jaw 2 or the second clamping jaw 72, and the clamping surface 21 of the first clamping jaw 2 or the second clamping jaw 72 approaches the central axis at the same speed to clamp the sample. Figure 8 The pressure plate moves the clamping surfaces 21 of the first clamping jaw 2 or the second clamping jaw 72 away from each other to release the sample.

[0046] Compared with the existing technology, a carbon fiber multifilament sample clamping device according to the utility model clamps the sample through multiple claws. Compared with the traditional general clamping block, its advantage is that the clamping force is evenly dispersed, the local pressure is reduced, and the sample is prevented from breaking prematurely at the clamping position during the test process. At the same time, when the sample is clamped, the fiber multifilament sample is collinear with the center axis, and the sample is aligned while being clamped, without the need for an additional centering device.

[0047] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the present invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the present invention and various options and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A carbon fiber multifilament sample clamping device, characterized in that: include: a first pressure plate, wherein a plurality of circular holes are formed on the first pressure plate, and a plurality of first sliding blocks are provided on the first pressure plate; A first clamping jaw is provided with a clamping surface, a first slideway matching the first slider is provided on the first clamping jaw, and a second slideway is provided on the first clamping jaw; A first stopper, wherein a limiting hole is provided in the first stopper, and a second slider matching the second slideway is provided on the first stopper, and the second sliders are distributed on the hole wall of the limiting hole; It also includes a tensile machine head, which includes a hydraulic column, a clamping head and a limiting rod. The tensile machine head can push the first clamping claw to slide along the second sliding block.

2. The carbon fiber multifilament sample clamping device according to claim 1, characterized in that: The first slider, the first slideway, the second slideway and the second slider have trapezoidal cross sections.

3. The carbon fiber multifilament sample clamping device according to claim 1, characterized in that: A spring is fixedly connected between the circular hole and the limiting rod.

4. The carbon fiber multifilament sample clamping device according to claim 3, characterized in that: The limiting rod is provided with a limiting groove, and the spring fixedly connected to the limiting rod is located in the limiting groove.

5. The carbon fiber multifilament sample clamping device according to claim 1, characterized in that: It also includes a support rod, which includes a threaded rod, and both ends of the threaded rod are threadedly connected to the support rod.

6. The carbon fiber multifilament sample clamping device according to claim 1, characterized in that: It also includes a second pressure plate, a second claw and a second stopper.

7. The carbon fiber multifilament sample clamping device according to claim 1, characterized in that: Also included is a third pressure plate, which includes a sleeve that matches the hydraulic column.

8. The carbon fiber multifilament sample clamping device according to claim 7, characterized in that: A plurality of threaded holes are provided in the sleeve, and fixing bolts are threadedly connected in the threaded holes.

9. The carbon fiber multifilament sample clamping device according to claim 1, characterized in that: The number of the second sliding blocks is at least two.

10. The carbon fiber multifilament sample clamping device according to claim 1, characterized in that: The clamping surface is provided with a frosted surface.

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