Improved annular pressing clamp for low-thickness paper and use method

Abstract

The invention discloses an improved annular pressing clamp for low-thickness paper and a using method. The improved annular pressing clamp comprises an upper supporting core barrel, a lower supporting core barrel and a guide column, and the top end of the upper supporting core barrel is used for being installed at the moving end of a material testing machine; the bottom end of the lower supporting core cylinder is mounted at a fixed end of a material testing machine; a mounting hole is formed in the top surface of the lower supporting core cylinder, one end of the guide column is mounted at the bottom end of the upper supporting core cylinder, the other end of the guide column is slidably mounted in the mounting hole, and a gap for paper deformation is formed between the bottom surface of the upper supporting core cylinder and the top surface of the lower supporting core cylinder. According to the improved annular compression clamp for the low-thickness paper and the use method, the in-plane compression strength of the low-thickness paper can be tested.

Description

Technical Field

[0001] The invention relates to the technical field of paper strength testing, and more particularly to an improved ring pressing fixture for low-thickness paper and a use method thereof. Background Art

[0002] The paper ring compression fixture is a device for measuring the in-plane compression strength of paper. An ideal ring compression fixture should be able to achieve compression damage to the material itself to avoid structural instability. Conventional ring compression fixtures consist of a base and a removable inner plate, as described in GB / T2679.8, and are suitable for testing the ring compression strength of paper and paperboard with a thickness range of 0.10mmˉ0.58mm. However, with the improvement of paper performance and the increase in the demand for material weight reduction, paper with lower thickness is playing an increasingly important role. For example, aramid honeycomb paper, which has broad application prospects in fields such as aerospace, is usually of low thickness (0.03mmˉ0.10mm) and has requirements for in-plane compression bearing performance.

[0003] However, when using a conventional ring-crushing fixture for testing, the test result is structural instability failure rather than material compression failure, that is, the conventional ring-crushing fixture can no longer meet the requirements of the in-plane compression strength test of low-thickness paper. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an improved ring pressing fixture for low-thickness paper and a method of using the same, so as to be able to perform in-plane compression strength testing on low-thickness paper.

[0005] Based on the above purpose, the present invention provides an improved ring pressing fixture for low-thickness paper, comprising an upper supporting core barrel, a lower supporting core barrel, and a guide column, wherein: the top end of the upper supporting core barrel is used to be installed on the moving end of a material testing machine; the bottom end of the lower supporting core barrel is used to be installed on the fixed end of the material testing machine; a mounting hole is provided on the top surface of the lower supporting core barrel, one end of the guide column is installed on the bottom end of the upper supporting core barrel, and the other end of the guide column is slidably installed in the mounting hole, and a gap is provided between the bottom surface of the upper supporting core barrel and the top surface of the lower supporting core barrel for deforming the paper.

[0006] Optionally, it also includes an upper pressing piece and a lower pressing piece, the movable end is the crossbeam of the material testing machine, the top end of the upper supporting core barrel is installed on the bottom of the upper pressing piece, and the top of the upper pressing piece is used to be installed on the crossbeam of the material testing machine; the fixed end is the base of the material testing machine, the bottom end of the lower supporting core barrel is installed on the top of the lower pressing piece, and the bottom of the lower pressing piece is used to be installed on the base of the material testing machine.

[0007] Optionally, the upper pressure piece includes an upper joint, an upper pressure plate and an upper outer pressure plate, one end of the upper joint is installed on the top surface of the upper pressure plate, the other end of the upper joint is installed on the crossbeam of the material testing machine, the top surface of the upper outer pressure plate is installed on the bottom surface of the upper pressure plate, and the top end of the upper supporting core barrel is installed on the bottom surface of the upper outer pressure plate; the lower pressure piece includes a lower joint, a lower pressure plate and a lower outer pressure plate, the top surface of the lower outer pressure plate is installed on the bottom end of the lower supporting core barrel, the bottom surface of the lower outer pressure plate is installed on the top surface of the lower pressure plate, one end of the lower joint is installed on the bottom surface of the lower pressure plate, and the other end of the lower joint is installed on the base of the material testing machine.

[0008] Optionally, two guide rods are further included, and the two guide rods are installed between the upper pressing plate and the lower pressing plate in an opposite manner.

[0009] Optionally, an upper locking nut is provided at one end of the upper joint close to the upper pressing plate, and a lower locking nut is provided at one end of the lower joint away from the lower pressing plate.

[0010] Optionally, it also includes a core barrel locking nut, the top of which is installed on the bottom of the upper pressure plate, and the bottom surface of the core barrel locking nut is fitted on the top surface of the upper outer pressure plate, the upper end diameter of the upper support core barrel is smaller than the lower end diameter of the upper support core barrel, and the upper end diameter of the lower support core barrel is larger than the lower end diameter of the lower support core barrel, the bottom surface of the upper outer pressure plate is provided with an upper boss, and a first stepped hole is opened in the upper boss, the first stepped hole includes a first hole and a second hole connected to each other, the aperture of the first hole is smaller than the aperture of the second hole, the upper end of the upper support core barrel is successively passed through the second hole, the first hole, the upper outer pressure plate, and the upper pressure plate, and then threadedly installed in the core barrel locking nut, and the lower end of the upper support core barrel The upper end surface of the part abuts on the bottom surface of the second hole, and the outer circumferential surface of the lower end of the upper support core barrel is gap-matched with the second hole, and has a first gap; the top surface and bottom surface of the lower outer pressure plate are respectively provided with a first lower boss and a second lower boss, and the second lower boss is clamped and installed on the top surface of the lower pressure plate, and a second stepped hole is opened in the first lower boss, and the second stepped hole includes a third hole and a fourth hole that are connected, and the aperture of the third hole is smaller than the aperture of the fourth hole, and the lower end of the lower support core barrel is clamped and installed in the third hole after passing through the fourth hole, and the lower end surface of the upper end of the lower support core barrel abuts on the bottom surface of the fourth hole, and the outer circumferential surface of the upper end of the lower support core barrel is gap-matched with the fourth hole, and has a second gap.

[0011] Optionally, the first gap is 0.05-0.30 mm, and the depth of the second hole is 0-3 mm; the second gap is 0.05-0.30 mm, and the depth of the fourth hole is 0-3 mm.

[0012] Optionally, the guide column is a rectangular column or two circular cylinders arranged in parallel.

[0013] Optionally, it also includes a ball head, the top surface of the ball head is installed on the bottom surface of the lower outer plate, the bottom of the ball head is a raised arc-shaped end surface, the top surface of the lower joint is provided with an arc-shaped groove adapted to the arc-shaped end surface, and the arc-shaped end surface is clamped in the arc-shaped groove.

[0014] Optionally, the gap is an inclined gap, the inclination angle of the inclined gap is 0-60°, and the width of the inclined gap is 0.2mm-4mm.

[0015] Optionally, the gap is a horizontal gap.

[0016] Optionally, the diameters of the upper supporting core barrel and the lower supporting core barrel are the same, both being 4-20 mm, and the total height of the upper supporting core barrel and the lower supporting core barrel after being installed together is 12.7 mm-100 mm.

[0017] Based on the same inventive concept, the present invention also provides a method for using an improved ring pressing fixture for low-thickness paper, using any of the above-mentioned improved ring pressing fixtures for low-thickness paper to perform in-plane compression strength tests on low-thickness paper, and also includes the following steps: step 1, installing the top end of the upper support core tube on the moving end of the material testing machine, and installing the bottom end of the lower support core tube on the fixed end of the material testing machine; step 2, winding and fixing the paper on the outer circumferential surfaces of the upper support core tube and the lower support core tube; step 3, opening a mounting hole on the top surface of the lower support core tube, and installing one end of the guide column Install it on the bottom end of the upper support core barrel, and slidably install the other end of the guide column in the mounting hole. By controlling the moving end of the material testing machine, adjust the distance between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel, so that there is a gap between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel for paper deformation; Step 4, turn on the material testing machine, make its moving end move at a constant rate, collect the load-displacement curve, when the load reaches the maximum, record the force value at this time, and stop the test. The force value at this time divided by the area of ​​the load-bearing cross-section of the paper is the in-plane compression strength of the paper.

[0018] Based on the same inventive concept, the present invention also provides a method for using an improved ring pressing fixture for low-thickness paper, which uses the improved ring pressing fixture for low-thickness paper described in any of the above items to perform in-plane compression strength test on low-thickness paper, and also includes the following steps: Step 1, install the top end of the upper support core tube on the bottom of the upper pressure piece, install the top of the upper pressure piece on the crossbeam of the material testing machine, install the bottom end of the lower support core tube on the top of the lower pressure piece, and install the bottom of the lower pressure piece on the base of the material testing machine; Step 2, move the crossbeam of the material testing machine to keep the upper pressure piece and the lower pressure piece parallel, end leveling, and adjust the zero position of the material testing machine; Step 3, open a mounting hole on the top surface of the lower support core tube, install one end of the guide column on the bottom end of the upper support core tube, and install the other end of the guide column It is slidably installed in the installation hole, and the distance between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel is adjusted by controlling the position of the crossbeam of the material testing machine, so that there is a gap between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel for paper deformation; step 4, remove the upper support core barrel and the lower support core barrel, and wrap and fix the paper on the outer circumferential surface of the upper support core barrel and the lower support core barrel; step 5, install the top end of the upper support core barrel after wrapping the paper on the bottom of the upper pressure piece, and install the bottom end of the lower support core barrel on the top of the lower pressure piece; step 6, turn on the material testing machine, so that its crossbeam moves at a constant rate, collect the load-displacement curve, and when the load reaches the maximum, record the force value at this time and stop the test. The force value at this time divided by the area of ​​the load-bearing cross section of the paper is the in-plane compression strength of the paper.

[0019] The invention provides an improved ring pressing fixture for low-thickness paper and a method for using the improved ring pressing fixture for low-thickness paper. The improved ring pressing fixture for low-thickness paper comprises an upper supporting core barrel, a lower supporting core barrel, and a guide column. First, the top end of the upper supporting core barrel is installed on the moving end of a material testing machine, and the bottom end of the lower supporting core barrel is installed on the fixed end of the material testing machine; the paper is wound and fixed on the outer peripheral surfaces of the upper supporting core barrel and the lower supporting core barrel; a mounting hole is provided on the top surface of the lower supporting core barrel, one end of the guide column is installed on the bottom end of the upper supporting core barrel, and the other end of the guide column is slidably installed in the mounting hole; then, by controlling the moving end of the material testing machine, the distance between the bottom surface of the upper supporting core barrel and the top surface of the lower supporting core barrel is adjusted, so that there is a gap between the bottom surface of the upper supporting core barrel and the top surface of the lower supporting core barrel for paper deformation; finally, the material testing machine is turned on to make its moving end move at a constant speed, and a load displacement curve is collected. When the load reaches the maximum, the force value at this time is recorded, and the test is stopped. The force value at this time divided by the area of ​​the load-bearing cross section of the paper is the in-plane compression strength of the paper. The improved ring pressing fixture for low-thickness paper and the use method thereof provided by the present invention can perform in-plane compression strength test on low-thickness paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the objects and advantages of the present invention, wherein:

[0021] Figure 1 It is a schematic structural diagram of an improved ring pressing fixture for low-thickness paper according to an embodiment of the present invention;

[0022] Figure 2 A front view of an improved ring pressing fixture for low-thickness paper according to an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the installation structure between the upper outer pressure plate, the lower outer pressure plate, the upper support core cylinder and the lower support core cylinder in the improved ring pressing fixture for low-thickness paper according to one embodiment of the present invention;

[0024] Figure 4 It is a first schematic diagram of the installation structure between the upper supporting core cylinder, the lower supporting core cylinder and the rectangular column in the improved ring pressing fixture for low-thickness paper according to one embodiment of the present invention;

[0025] Figure 5 A second schematic diagram of the installation structure between the upper supporting core barrel, the lower supporting core barrel and the rectangular column in the improved ring pressing fixture for low-thickness paper according to an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of the first structure of the installation between the upper supporting core cylinder, the lower supporting core cylinder and two parallel cylinders in the improved ring pressing fixture for low-thickness paper according to one embodiment of the present invention;

[0027] Figure 7 It is a schematic diagram of the second structure of the installation between the upper supporting core cylinder, the lower supporting core cylinder and the two parallel cylinders in the improved ring pressing fixture for low-thickness paper according to one embodiment of the present invention;

[0028] Figure 8 It is a partial schematic diagram of the cooperation and installation between the lower supporting core cylinder and the second stepped hole in the improved ring pressing fixture for low-thickness paper according to one embodiment of the present invention;

[0029] Fig. 9 A first flow chart of a method for using an improved ring pressing fixture for low-thickness paper according to an embodiment of the present invention;

[0030] Fig.10 The second flow chart of the method for using the improved ring pressing fixture for low-thickness paper according to an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1: upper pressure piece; 2: lower pressure piece; 3: upper supporting core barrel; 4: lower supporting core barrel; 5: gap; 6: upper joint; 7: upper pressure plate; 8: upper outer pressure plate; 9: lower joint; 10: lower pressure plate; 11: lower outer pressure plate; 12: guide rod; 13: upper locking nut; 14: lower locking nut; 15: core barrel locking nut; 16: upper boss; 17: first lower boss; 18: second lower boss; 19: rectangular column; 20: round column; 21: ball head; 22: inclined gap; 23: horizontal gap; 24: second gap. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the embodiments. The same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0034] like Figure 1 and Figure 2 As shown, the improved ring pressing fixture for low-thickness paper provided by the present invention includes an upper supporting core barrel 3, a lower supporting core barrel 4, and a guide column. The top end of the upper supporting core barrel 3 is used to be installed on the moving end of the material testing machine; the bottom end of the lower supporting core barrel 4 is used to be installed on the fixed end of the material testing machine; a mounting hole is opened on the top surface of the lower supporting core barrel 4, one end of the guide column is installed on the bottom end of the upper supporting core barrel 3, and the other end of the guide column is slidably installed in the mounting hole, and a gap is provided between the bottom surface of the upper supporting core barrel 3 and the top surface of the lower supporting core barrel 4 for paper deformation.

[0035] It should be noted that: when the other end of the guide column is installed in the mounting hole, the upper support core tube 3 and the lower support core tube 4 form a whole, which can provide lateral support for the paper; further, the bottom surface of the upper support core tube 3 and the top surface of the lower support core tube 4 are parallel to each other.

[0036] The improved ring pressing fixture for low-thickness paper provided by the present invention comprises an upper supporting core barrel 3, a lower supporting core barrel 4, and a guide column. First, the top end of the upper supporting core barrel 3 is installed on the moving end of a material testing machine, and the bottom end of the lower supporting core barrel 4 is installed on the fixed end of the material testing machine; the paper is wound and fixed on the outer peripheral surfaces of the upper supporting core barrel 3 and the lower supporting core barrel 4; a mounting hole is opened on the top surface of the lower supporting core barrel 4, one end of the guide column is installed on the bottom end of the upper supporting core barrel 3, and the other end of the guide column is slidably installed in the mounting hole; then, by controlling the moving end of the material testing machine, the distance between the bottom surface of the upper supporting core barrel 3 and the top surface of the lower supporting core barrel 4 is adjusted, so that there is a gap between the bottom surface of the upper supporting core barrel 3 and the top surface of the lower supporting core barrel 4 for paper deformation; finally, the material testing machine is turned on to make its moving end move at a constant speed, and the load displacement curve is collected. When the load reaches the maximum, the force value at this time is recorded, and the test is stopped. The force value at this time divided by the area of ​​the load-bearing cross-section of the paper is the in-plane compression strength of the paper. The improved ring pressing fixture for low-thickness paper provided by the invention can perform in-plane compression strength test on low-thickness paper.

[0037] like Figure 1 and Figure 2 As shown, it also includes an upper pressing piece and a lower pressing piece, the movable end is the crossbeam of the material testing machine, the top end of the upper supporting core barrel is installed on the bottom of the upper pressing piece, and the top of the upper pressing piece is used to be installed on the crossbeam of the material testing machine; the fixed end is the base of the material testing machine, the bottom end of the lower supporting core barrel is installed on the top of the lower pressing piece, and the bottom of the lower pressing piece is used to be installed on the base of the material testing machine. In this embodiment, the upper pressing piece and the lower pressing piece facilitate the installation between the upper supporting core barrel and the lower supporting core barrel, thereby improving the convenience of using and installing the improved ring pressing fixture for low-thickness paper.

[0038] like Figure 1 and Figure 3As shown, the upper pressing member 1 includes an upper joint 6, an upper pressing plate 7 and an upper outer pressing plate 8, one end of the upper joint 6 is installed on the top surface of the upper pressing plate 7, the other end of the upper joint 6 is installed on the crossbeam of the material testing machine, the top surface of the upper outer pressing plate 8 is installed on the bottom surface of the upper pressing plate 7, and the top end of the upper supporting core tube 3 is installed on the bottom surface of the upper outer pressing plate 8; the lower pressing member 2 includes a lower joint 9, a lower pressing plate 10 and a lower outer pressing plate 11, the top surface of the lower outer pressing plate 11 is installed on the bottom end of the lower supporting core tube 4, the bottom surface of the lower outer pressing plate 11 is installed on the top surface of the lower pressing plate 10, one end of the lower joint 9 is installed on the bottom surface of the lower pressing plate 10, and the other end of the lower joint 9 is installed on the base of the material testing machine. In this embodiment, the upper pressure piece 1 is made into a detachable ground joint 6, an upper pressure plate 7 and an upper outer pressure plate 8, and the lower pressure piece 2 is made into a detachable underground joint 9, a lower pressure plate 10 and a lower outer pressure plate 11. On the one hand, it facilitates the installation and disassembly of the improved ring pressing fixture for low-thickness paper. On the other hand, it can flexibly adapt to upper inner supporting core tubes and lower supporting core tubes 4 of different diameters to meet the testing requirements of different specifications of paper (thickness range 0.03mm-0.10mm), thereby improving the convenience and applicability of installation and disassembly of the improved ring pressing fixture for low-thickness paper.

[0039] like Figure 1 and Figure 2 As shown, two guide rods 12 are also included, and the two guide rods 12 are relatively installed between the upper pressing plate 7 and the lower pressing plate 10. In this embodiment, the two guide rods 12 can better level the lower pressing plate 10 and the lower pressing plate 10, thereby improving the convenience of use of the improved ring pressing clamp for low-thickness paper.

[0040] like Figure 1 and Figure 2 As shown, an upper locking nut 13 is provided at one end of the upper joint 6 close to the upper pressing plate 7, and a lower locking nut 14 is provided at one end of the lower joint 9 away from the lower pressing plate 10. In this embodiment, the upper locking nut 13 can stably mount the upper joint 6 on the crossbeam of the material testing machine, and the lower locking nut 14 can stably mount the lower joint 9 on the base of the material testing machine, thereby improving the structural stability of the improved ring pressing fixture for low-thickness paper.

[0041] like Figures 3 to 8As shown, it also includes a core barrel locking nut 15, the top of the core barrel locking nut 15 is installed on the bottom of the upper pressure plate 7, the bottom surface of the core barrel locking nut 15 is fitted on the top surface of the upper outer pressure plate 8, the upper end diameter of the upper support core barrel 3 is smaller than the lower end diameter of the upper support core barrel 3, the upper end diameter of the lower support core barrel 4 is larger than the lower end diameter of the lower support core barrel 4, the bottom surface of the upper outer pressure plate 8 is provided with an upper boss 16, and a first stepped hole is opened in the upper boss 16, the first stepped hole includes a first hole and a second hole connected to each other, the aperture of the first hole is smaller than the aperture of the second hole, the upper end of the upper support core barrel 3 is successively penetrated through the second hole, the first hole, the upper outer pressure plate 8, and the upper pressure plate 7, and then is threadedly installed in the core barrel locking nut 15, and the lower end of the upper support core barrel 3 The upper end surface of the lower outer pressure plate 11 abuts against the bottom surface of the second hole, and the outer circumferential surface of the lower end of the upper support core barrel 3 is gap-matched with the second hole, and has a first gap; the top and bottom surfaces of the lower outer pressure plate 11 are respectively provided with a first lower boss 17 and a second lower boss 18, and the second lower boss 18 is snap-fitted to the top surface of the lower pressure plate 10, and a second stepped hole is opened in the first lower boss 17, and the second stepped hole includes a third hole and a fourth hole that are connected, and the aperture of the third hole is smaller than the aperture of the fourth hole, and the lower end of the lower support core barrel 4 is snap-fitted in the third hole after passing through the fourth hole, and the lower end surface of the upper end of the lower support core barrel 4 abuts against the bottom surface of the fourth hole, and the outer circumferential surface of the upper end of the lower support core barrel 4 is gap-fitted with the fourth hole, and has a second gap 24. In this embodiment, the first gap and the second gap 24 can realize end constraints on the two end surfaces of the low-thickness paper, thereby avoiding edge crushing at both ends of the low-thickness paper, so that the low-thickness paper can be destroyed at the gap between the upper supporting core tube 3 and the lower supporting core tube 4, so that the clamp can perform in-plane compression strength testing on even lower thickness paper.

[0042] like Figure 8 As shown, the first gap is 0.05-0.30 mm, and the depth of the second hole is 3 mm; the second gap 24 is 0.05-0.30 mm, and the depth of the fourth hole is 3 mm. In this embodiment, the size range of the first gap and the second gap 24 can constrain the ends of various specifications of low-thickness paper, thereby improving the applicability of the improved ring pressing fixture for low-thickness paper.

[0043] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the guide column is a rectangular column 19 or two parallel cylindrical columns 20. In this embodiment, the guide columns of the above two structures can adapt to upper supporting core tubes 3 and lower supporting core tubes 4 of various diameters, thereby improving the applicability of the improved ring pressing clamp for low-thickness paper.

[0044] like Figure 1 and Figure 2As shown, it also includes a ball head 21, the top surface of the ball head 21 is installed on the bottom surface of the lower outer plate, the bottom of the ball head 21 is a convex arc-shaped end surface, and the top surface of the lower joint 9 is provided with an arc-shaped groove adapted to the arc-shaped end surface, and the arc-shaped end surface is clamped in the arc-shaped groove. In this embodiment, the ball head 21 with the arc-shaped end surface can flexibly level the upper pressing member 1 and the lower pressing member 2, thereby improving the convenience of use of the improved ring pressing clamp for low-thickness paper.

[0045] In one embodiment of the present invention, the gap 5 is an inclined gap 22, the inclination angle of the inclined gap 22 is 0-60°, the width of the inclined gap 22 is 0.2mm-4mm, and the inclined gap 22 can cover a wider range of paper thickness while providing lateral support, thereby improving the applicability of the improved ring pressing clamp for low-thickness paper.

[0046] In one embodiment of the present invention, the gap 5 is a horizontal gap 23. The horizontal gap 23 can be processed more conveniently, thereby improving the applicability of the improved ring pressing fixture for low-thickness paper.

[0047] In one embodiment of the present invention, the diameters of the upper support core barrel 3 and the lower support core barrel 4 are both 4-20 mm, specifically 6 mm; the total height of the upper support core barrel 3 and the lower support core barrel 4 after being installed together is 12.7 mm-100 mm, specifically 37 mm; the thickness of the low-thickness paper can be 0.03 mm-0.10 mm; the low-thickness paper can be wrapped around the outer circumference of the upper support core barrel 3 and the lower support core barrel 4 for 1-3 turns; the moving rate of the beam of the material testing machine is 0.1-10 mm / min; the gap between the lower end surface of the upper support core barrel 3 and the upper end surface of the lower support core barrel 4 can be 1 mm.

[0048] like Figures 1 to 9As shown, based on the same inventive concept, the present invention also provides a method for using an improved ring pressing fixture for low-thickness paper, using the improved ring pressing fixture for low-thickness paper of any of the aforementioned embodiments to perform an in-plane compression strength test on the low-thickness paper, and further comprising the following steps: step 1, installing the top end of the upper support core barrel on the moving end of the material testing machine, and installing the bottom end of the lower support core barrel on the fixed end of the material testing machine; step 2, winding and fixing the paper on the outer circumferential surfaces of the upper support core barrel and the lower support core barrel; step 3, opening a mounting hole on the top surface of the lower support core barrel, and inserting one end of the guide column The end is installed at the bottom end of the upper supporting core barrel, and the other end of the guide column is slidably installed in the mounting hole. By controlling the moving end of the material testing machine, the distance between the bottom surface of the upper supporting core barrel and the top surface of the lower supporting core barrel is adjusted, so that there is a gap between the bottom surface of the upper supporting core barrel and the top surface of the lower supporting core barrel for paper deformation; Step 4, turn on the material testing machine, make its moving end move at a constant rate, collect the load-displacement curve, when the load reaches the maximum, record the force value at this time, and stop the test. The force value at this time divided by the area of ​​the load-bearing cross-section of the paper is the in-plane compression strength of the paper.

[0049] like Figures 1 to 8 and Fig.10 As shown, based on the same inventive concept, the present invention also provides a method for using an improved ring pressing fixture for low-thickness paper, and uses the improved ring pressing fixture for low-thickness paper of any of the aforementioned embodiments to perform an in-plane compression strength test on the low-thickness paper, which also includes the following steps: Step 1, install the top end of the upper support core barrel on the bottom of the upper pressing piece, install the top of the upper pressing piece on the crossbeam of the material testing machine, install the bottom end of the lower support core barrel on the top of the lower pressing piece, and install the bottom of the lower pressing piece on the base of the material testing machine; Step 2, move the crossbeam of the material testing machine to keep the upper pressing piece and the lower pressing piece parallel, end the leveling, and adjust the zero position of the material testing machine; Step 3, open a mounting hole on the top surface of the lower support core barrel, install one end of the guide column on the bottom end of the upper support core barrel, and install the other end of the guide column on the bottom end of the upper support core barrel. It can be slidably installed in the installation hole, and by controlling the position of the crossbeam of the material testing machine, the distance between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel is adjusted, so that there is a gap between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel for paper deformation; step four, remove the upper support core barrel and the lower support core barrel, and wrap and fix the paper on the outer circumferential surface of the upper support core barrel and the lower support core barrel; step five, install the top end of the upper support core barrel after wrapping the paper on the bottom of the upper pressure piece, and install the bottom end of the lower support core barrel on the top of the lower pressure piece; step six, turn on the material testing machine, so that its crossbeam moves at a constant rate, collect the load-displacement curve, when the load reaches the maximum, record the force value at this time, and stop the test, the force value at this time divided by the area of ​​the load-bearing cross section of the paper is the in-plane compression strength of the paper.

[0050] The improved ring pressing fixture for low-thickness paper provided by the present invention and the method for using the same comprise an upper supporting core barrel 3, a lower supporting core barrel 4 and a guide column. First, the top end of the upper supporting core barrel 3 is mounted on the moving end of a material testing machine, and the bottom end of the lower supporting core barrel 4 is mounted on the fixed end of the material testing machine; the paper is wound and fixed on the outer peripheral surfaces of the upper supporting core barrel 3 and the lower supporting core barrel 4; a mounting hole is provided on the top surface of the lower supporting core barrel 4, one end of the guide column is mounted on the bottom end of the upper supporting core barrel 3, and the other end of the guide column is slidably mounted in the mounting hole; then, by controlling the moving end of the material testing machine, the distance between the bottom surface of the upper supporting core barrel 3 and the top surface of the lower supporting core barrel 4 is adjusted so that there is a gap between the bottom surface of the upper supporting core barrel 3 and the top surface of the lower supporting core barrel 4 for paper deformation; finally, the material testing machine is turned on to make its moving end move at a constant speed, and a load displacement curve is collected. When the load reaches the maximum, the force value at this time is recorded, and the test is stopped. The force value at this time divided by the area of ​​the load-bearing cross section of the paper is the in-plane compression strength of the paper. The improved ring pressing fixture for low-thickness paper and the use method thereof provided by the present invention can perform in-plane compression strength test on low-thickness paper.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An improved ring pressing fixture for low-thickness paper, characterized in that: It includes an upper supporting core barrel, a lower supporting core barrel, and a guide column, wherein: The top end of the upper support core barrel is used to be installed on the moving end of the material testing machine; The bottom end of the lower support core barrel is used to be installed on the fixed end of the material testing machine; A mounting hole is provided on the top surface of the lower supporting core tube, one end of the guide column is installed on the bottom end of the upper supporting core tube, and the other end of the guide column is slidably installed in the mounting hole, and a gap is provided between the bottom surface of the upper supporting core tube and the top surface of the lower supporting core tube for the paper to be deformed.

2. The improved ring pressing fixture for low-thickness paper according to claim 1, characterized in that: It also includes an upper pressing piece and a lower pressing piece, the movable end is the crossbeam of the material testing machine, the top end of the upper supporting core barrel is installed on the bottom of the upper pressing piece, and the top of the upper pressing piece is used to be installed on the crossbeam of the material testing machine; the fixed end is the base of the material testing machine, the bottom end of the lower supporting core barrel is installed on the top of the lower pressing piece, and the bottom of the lower pressing piece is used to be installed on the base of the material testing machine.

3. The improved ring pressing fixture for low-thickness paper according to claim 2, characterized in that: The upper pressure piece includes an upper joint, an upper pressure plate and an upper outer pressure plate, one end of the upper joint is installed on the top surface of the upper pressure plate, the other end of the upper joint is installed on the crossbeam of the material testing machine, the top surface of the upper outer pressure plate is installed on the bottom surface of the upper pressure plate, and the top end of the upper supporting core barrel is installed on the bottom surface of the upper outer pressure plate; the lower pressure piece includes a lower joint, a lower pressure plate and a lower outer pressure plate, the top surface of the lower outer pressure plate is installed on the bottom end of the lower supporting core barrel, the bottom surface of the lower outer pressure plate is installed on the top surface of the lower pressure plate, one end of the lower joint is installed on the bottom surface of the lower pressure plate, and the other end of the lower joint is installed on the base of the material testing machine.

4. The improved ring pressing fixture for low-thickness paper according to claim 3, characterized in that: It also includes two guide rods, which are installed between the upper pressing plate and the lower pressing plate in a relatively arranged manner.

5. The improved ring pressing fixture for low-thickness paper according to claim 4, characterized in that: An upper locking nut is arranged at one end of the upper joint close to the upper pressing plate, and a lower locking nut is arranged at one end of the lower joint away from the lower pressing plate.

6. The improved ring pressing fixture for low-thickness paper according to claim 5, characterized in that: The cam is secured to the bottom of the upper and lower portions of the upper and lower portions of the cam, and the cam is secured to the bottom of the upper and lower portions of the cam. The upper end surface abuts on the bottom surface of the second hole, and the outer circumferential surface of the lower end of the upper supporting core barrel is gap-matched with the second hole, and has a first gap; the top surface and bottom surface of the lower outer pressure plate are respectively provided with a first lower boss and a second lower boss, and the second lower boss is clamped and installed on the top surface of the lower pressure plate, and a second stepped hole is opened in the first lower boss, and the second stepped hole includes a third hole and a fourth hole that are connected, and the aperture of the third hole is smaller than the aperture of the fourth hole, and the lower end of the lower supporting core barrel is clamped and installed in the third hole after passing through the fourth hole, and the lower end surface of the upper end of the lower supporting core barrel abuts on the bottom surface of the fourth hole, and the outer circumferential surface of the upper end of the lower supporting core barrel is gap-matched with the fourth hole, and has a second gap.

7. The improved ring pressing fixture for low-thickness paper according to claim 6, characterized in that: The first gap is 0.05-0.30 mm, and the depth of the second hole is 0-3 mm; the second gap is 0.05-0.30 mm, and the depth of the fourth hole is 0-3 mm.

8. The improved ring pressing fixture for low-thickness paper according to claim 1, characterized in that: The guide column is a rectangular column or two circular columns arranged in parallel.

9. The improved ring pressing fixture for low-thickness paper according to claim 2, characterized in that: It also includes a ball head, the top surface of which is installed on the bottom surface of the lower outer plate, the bottom of which is a raised arc-shaped end surface, the top surface of the lower joint is provided with an arc-shaped groove matched with the arc-shaped end surface, and the arc-shaped end surface is clamped in the arc-shaped groove.

10. The improved ring pressing fixture for low-thickness paper according to claim 1, characterized in that: The slot is an inclined slot, the inclination angle of the inclined slot is 0-60°, and the width of the inclined slot is 0.2mm-4mm.

11. The improved ring pressing fixture for low-thickness paper according to claim 1, characterized in that: The gap is a horizontal gap.

12. The improved ring pressing fixture for low-thickness paper according to claim 1, characterized in that: The diameters of the upper support core barrel and the lower support core barrel are the same, both of which are 4-20 mm. The total height of the upper support core barrel and the lower support core barrel after being installed together is 12.7 mm-100 mm.

13. A method for using an improved ring pressing fixture for low-thickness paper, using the improved ring pressing fixture for low-thickness paper according to any one of claims 1 to 12 to perform an in-plane compression strength test on low-thickness paper, characterized in that: The following steps are also included: Step 1: Install the top end of the upper support core barrel on the moving end of the material testing machine, and install the bottom end of the lower support core barrel on the fixed end of the material testing machine; Step 2: Wrap the paper around the outer circumference of the upper support core tube and the lower support core tube; Step 3: A mounting hole is formed on the top surface of the lower support core barrel, one end of the guide column is mounted on the bottom end of the upper support core barrel, and the other end of the guide column is slidably mounted in the mounting hole. By controlling the moving end of the material testing machine, the distance between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel is adjusted so that there is a gap between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel for paper deformation; Step 4: Turn on the material testing machine and move its mobile end at a constant rate to collect the load-displacement curve. When the load reaches the maximum, record the force value at this time and stop the test. The force value at this time divided by the area of ​​the load-bearing cross-section of the paper is the in-plane compression strength of the paper.

14. A method for using an improved ring pressing fixture for low-thickness paper, using the improved ring pressing fixture for low-thickness paper as claimed in any one of claims 2 to 12 to perform an in-plane compression strength test on low-thickness paper, characterized in that: The following steps are also included: Step 1: Install the top of the upper support core barrel on the bottom of the upper pressure piece, install the top of the upper pressure piece on the crossbeam of the material testing machine, install the bottom end of the lower support core barrel on the top of the lower pressure piece, and install the bottom of the lower pressure piece on the base of the material testing machine; Step 2: Move the crossbeam of the material testing machine to keep the upper and lower pressing parts parallel, complete the leveling, and adjust the zero position of the material testing machine; Step 3: A mounting hole is formed on the top surface of the lower support core barrel, one end of the guide column is mounted on the bottom end of the upper support core barrel, and the other end of the guide column is slidably mounted in the mounting hole. By controlling the position of the crossbeam of the material testing machine, the distance between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel is adjusted so that there is a gap between the bottom surface of the upper support core barrel and the top surface of the lower support core barrel for paper deformation; Step 4: Remove the upper support core tube and the lower support core tube, and wrap and fix the paper on the outer circumference of the upper support core tube and the lower support core tube; Step 5: Install the top end of the upper support core tube after the paper is wound on the bottom of the upper pressing piece, and install the bottom end of the lower support core tube on the top of the lower pressing piece; Step 6. Turn on the material testing machine and move its crossbeam at a constant rate. Collect the load-displacement curve. When the load reaches the maximum, record the force value at this time and stop the test. The force value at this time divided by the area of ​​the load-bearing cross section of the paper is the in-plane compression strength of the paper.

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