Self-locking fixture for testing tensile strength of paper and usage method therefor

Abstract

A self-locking fixture for testing the tensile strength of paper and a usage method therefor. The self-locking fixture comprises an upper joint (1), an upper winding shaft (2), a lower joint (3), a lower winding shaft (4), an upper fixture (5) and a lower fixture (6). An upper end portion (13) of paper (36) is wound clockwise through the upper winding shaft (2) and passes through an upper through hole (11) counterclockwise and is then attached to an upper attachment portion (14), a lower end portion (17) of the paper (36) is wound counterclockwise through the lower winding shaft (4) and passes through a lower through hole (12) clockwise and is then attached to a lower attachment portion (16), and a middle portion (15) of the paper (36) is perpendicularly disposed between the upper winding shaft (2) and the lower winding shaft (4); or, the upper end portion (13) of the paper (36) is wound counterclockwise through the upper winding shaft (2) and passes through the upper through hole (11) clockwise and is then attached to the upper attachment portion (14), the lower end portion (17) is wound clockwise through the lower winding shaft (4) and passes through the lower through hole (12) counterclockwise and is then attached to the lower attachment portion (16), and the middle portion (15) is perpendicularly disposed between the upper winding shaft (2) and the lower winding shaft (4). In the self-locking fixture for testing the tensile strength of paper and the usage method therefor, the structure of the fixture is simplified, and the accuracy of a test result can be ensured when the tensile strength of paper is tested in high-temperature environment.

Description

Paper Tensile Strength Testing Self-Locking Fixture and Usage Method Technical Field

[0001] This invention relates to the field of paper tensile strength testing technology, and more specifically, to a self-locking fixture for paper tensile strength testing and its usage method. Background Technology

[0002] A paper tensile strength tester is a device used to test the tensile strength of paper. An ideal tensile strength tester should prevent the sample from slipping at the clamps and prevent it from breaking within the effective working range. Conventional push-pull clamps use metal or rubber clamps to hold the sample with a certain pressure, introducing the load into the working range of the sample through shearing. At room temperature, this type of clamp can meet the above requirements. However, at high temperatures (close to or above the glass transition temperature of the constituent materials), the paper's thickness decreases due to the softening of the constituent materials. In this case, with the clamp spacing remaining unchanged, the clamping force of the push-pull clamp will decrease significantly, causing the sample to slip (e.g., high-temperature resistant paper-based materials such as aramid III paper and PBO paper), making testing impossible.

[0003] A self-locking clamp is a device that automatically reduces the spacing to maintain clamping force as the sample thickness decreases. However, when operating in high-temperature environments (~550℃), existing self-locking clamps are too complex in structure, which is not conducive to long-term stable use. In addition, existing self-locking clamps require the use of metal clamping surfaces when testing in high-temperature environments. The paper surface has a resin layer with low hardness. When the metal clamping surface comes into contact with this resin layer, it will damage the surface of the paper sample, causing the paper sample to break in the clamping area, affecting the accuracy of the test results. Therefore, it is not suitable for tensile strength testing of samples such as aramid III paper and PBO paper.

[0004] Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a self-locking fixture for testing the tensile strength of paper and a method of using it, so as to simplify the fixture structure and maintain the accuracy of the test results when testing the tensile strength of paper in a high-temperature environment.

[0006] To achieve the above objectives, the present invention provides a self-locking fixture for testing the tensile strength of paper, comprising an upper connector, an upper winding shaft, a lower connector, a lower winding shaft, and upper and lower clamps arranged opposite to each other, wherein: the upper clamp includes an upper mounting end and an upper winding end, the upper connector is mounted on the upper mounting end, the upper winding shaft is mounted on the upper winding end, and the upper connector is used to mount on a load sensor of a testing machine; the lower clamp includes a lower mounting end and a lower winding end, the lower connector is mounted on the lower mounting end, the lower winding shaft is mounted on the lower winding end, and the lower connector is used to mount on a base of the testing machine; the upper winding shaft has an upper through hole on its side, and the lower winding shaft has a lower through hole on its side, and the paper comprises sequentially connected... The assembly comprises an upper end, an upper bonding portion, a middle portion, a lower bonding portion, and a lower end; the upper end is wound clockwise around the upper winding shaft and passed counterclockwise through the upper through hole before bonding to the upper bonding portion; the lower end is wound counterclockwise around the lower winding shaft and passed clockwise through the lower through hole before bonding to the lower bonding portion; the middle portion is vertically positioned between the upper winding shaft and the lower winding shaft; or the upper end is wound counterclockwise around the upper winding shaft and passed clockwise through the upper through hole before bonding to the upper bonding portion; the lower end is wound clockwise around the lower winding shaft and passed counterclockwise through the lower through hole before bonding to the lower bonding portion; the middle portion is vertically positioned between the upper winding shaft and the lower winding shaft.

[0007] Optionally, the upper clamp includes an upper plate, a first side plate, and a second side plate. The upper plate includes an upper mounting surface and an upper connecting surface facing away from each other. The upper connector is mounted on the upper mounting surface. The first side plate and the second side plate are mounted opposite each other on the upper connecting surface. The end of the first side plate away from the upper plate includes a first side surface with a first upper mounting hole. The end of the second side plate away from the upper plate includes a second side surface with the second side surface facing away from the first side surface and having a second upper mounting hole. The upper winding shaft passes through the first upper mounting hole and the second upper mounting hole in sequence and is rotatably mounted on the upper clamp. The lower clamp includes a lower plate, a third side plate, and a fourth side plate. The lower plate includes a lower mounting surface and a lower connecting surface that are arranged opposite to each other. The lower connector is mounted on the lower mounting surface. The third side plate and the fourth side plate are mounted opposite to each other on the lower connecting surface. The end of the third side plate away from the lower plate includes a third side surface, which has a first lower mounting hole. The end of the fourth side plate away from the lower plate includes a fourth side surface, which is arranged opposite to each other. The fourth side surface has a second lower mounting hole. The lower winding shaft passes through the first lower mounting hole and the second lower mounting hole in sequence and is rotatably mounted on the lower clamp.

[0008] Optionally, it also includes a first upper anti-rotation pin and a second upper anti-rotation pin. The end of the first side plate away from the upper plate also includes a fifth side plate that is perpendicularly connected to the first side plate. The fifth side plate has a first upper positioning hole. The end of the second side plate away from the upper plate also includes a sixth side plate that is perpendicularly connected to the second side plate. The sixth side plate has a second upper positioning hole. The first upper anti-rotation pin passes through the first upper positioning hole and the first upper mounting hole in sequence and is then installed on the first side plate. The second upper anti-rotation pin passes through the second upper positioning hole and the second upper mounting hole in sequence and is then installed on the second side plate.

[0009] Optionally, it also includes a first lower stop pin and a second lower stop pin. The end of the third side plate away from the lower plate also includes a seventh side plate that is perpendicularly connected to the third side plate. The seventh side plate has a first lower positioning hole. The end of the fourth side plate away from the lower plate also includes an eighth side plate that is perpendicularly connected to the fourth side plate. The eighth side plate has a second lower positioning hole. The first lower stop pin passes through the first lower positioning hole and the first lower mounting hole in sequence and is then installed on the third side plate. The second lower stop pin passes through the second lower positioning hole and the second lower mounting hole in sequence and is then installed on the fourth side plate.

[0010] Optionally, an upper locking nut is provided at one end of the upper connector near the upper clamp.

[0011] Optionally, a lower locking nut is provided at one end of the lower connector near the lower clamp.

[0012] Optionally, the upper through hole is formed in the middle of the side surface of the upper winding shaft, and the lower through hole is formed in the middle of the side surface of the lower winding shaft.

[0013] Optionally, the upper connector has an upper pin hole at one end away from the upper clamp, and the lower connector has a lower pin hole at one end away from the lower clamp.

[0014] Based on the same inventive concept, this invention also provides a method for using a self-locking clamp for testing the tensile strength of paper. The method involves using the self-locking clamp described in any of the preceding claims to test the tensile strength of paper, comprising the following steps: Step 1: Installing the upper winding shaft on the upper winding end of the upper clamp, and installing the lower winding shaft on the lower winding end of the lower clamp; Step 2: Winding the upper end of the paper clockwise through the upper winding shaft and counterclockwise through the upper through hole, then attaching it to the upper attachment part; winding the lower end of the paper counterclockwise through the lower winding shaft and clockwise through the lower through hole, then attaching it to the upper attachment part. In the lower bonding section, the middle part of the paper is vertically placed between the upper and lower winding shafts; or the upper end of the paper is wound counterclockwise through the upper winding shaft and clockwise through the upper through hole before being bonded to the upper bonding section; the lower end of the paper is wound clockwise through the lower winding shaft and counterclockwise through the lower through hole before being bonded to the lower bonding section, with the middle part of the paper vertically placed between the upper and lower winding shafts; Step 3: Install the upper connector on the load sensor of the testing machine, and install the lower connector on the base of the testing machine; Step 4: Turn on the testing machine and perform a tensile strength test on the paper.

[0015] This invention provides a self-locking fixture and method for testing the tensile strength of paper. The self-locking fixture includes an upper connector, an upper winding shaft, a lower connector, a lower winding shaft, and upper and lower clamps arranged opposite each other. First, the upper winding shaft is installed on the upper winding end of the upper clamp, and the lower winding shaft is installed on the lower winding end of the lower clamp. Then, the upper end of the paper is wound clockwise through the upper winding shaft and counterclockwise through the upper through hole, and then attached to the upper attachment part. The lower end of the paper is wound counterclockwise through the lower winding shaft and clockwise through the lower through hole, and then attached to the lower attachment part. The bonding section involves vertically positioning the middle portion of the paper between the upper and lower winding shafts; or, the upper end of the paper is wound counterclockwise around the upper winding shaft and then clockwise through the upper through-hole before being bonded to the upper bonding section, while the lower end of the paper is wound clockwise around the lower winding shaft and counterclockwise through the lower through-hole before being bonded to the lower bonding section, with the middle portion of the paper vertically positioned between the upper and lower winding shafts. Finally, the upper connector is installed on the load sensor of the testing machine, and the lower connector is installed on the base of the testing machine. The testing machine is then turned on to perform a tensile strength test on the paper. The self-locking fixture and method for testing paper tensile strength provided by this invention simplify the fixture structure and maintain the accuracy of the test results when performing tensile strength tests on paper in high-temperature environments. Attached Figure Description

[0016] 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 purpose and advantages of the present invention, wherein:

[0017] Figure 1 is a schematic diagram of the structure of a self-locking fixture for testing the tensile strength of paper according to an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the structure of a paper tensile strength testing self-locking fixture according to an embodiment of the present invention, in which the paper is wound between the upper and lower winding shafts.

[0019] Figure 3 is a side view of a paper tensile strength testing self-locking fixture according to an embodiment of the present invention;

[0020] Figure 4 is a cross-sectional view of the upper clamp at point AA in Figure 2;

[0021] Figure 5 is a cross-sectional view of the lower clamp at point AA in Figure 2;

[0022] Figure 6 is a schematic diagram of the upper winding shaft in a self-locking fixture for testing the tensile strength of paper according to an embodiment of the present invention.

[0023] Figure 7 is a flowchart of the method of using a self-locking fixture for testing the tensile strength of paper according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1: Upper connector; 2: Upper winding shaft; 3: Lower connector; 4: Lower winding shaft; 5: Upper clamp; 6: Lower clamp; 7: Upper mounting end; 8: Upper winding end; 9: Lower mounting end; 10: Lower winding end; 11: Upper through hole; 12: Lower through hole; 13: Upper end; 14: Upper fitting part; 15: Middle part; 16: Lower fitting part; 17: Lower end; 18: Upper plate; 19: First side plate; 20: Second side plate; 21: 21: First side panel; 22: Lower plate; 23: Third side panel; 24: Fourth side panel; 25: Third side panel; 26: First upper anti-rotation pin; 27: Second upper anti-rotation pin; 28: Fifth side panel; 29: Sixth side panel; 30: First lower anti-rotation pin; 31: Second lower anti-rotation pin; 32: Upper locking nut; 33: Lower locking nut; 34: Upper pin hole; 35: Lower pin hole; 36: Paper; 37: First upper positioning hole; 38: Second upper positioning hole; 39: First lower positioning hole; 40: Second lower positioning hole. Detailed Implementation

[0026] The present invention will now be described in detail with reference to embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0027] As shown in Figures 1 to 6, the self-locking fixture for testing the tensile strength of paper provided by the present invention includes an upper connector 1, an upper winding shaft 2, a lower connector 3, a lower winding shaft 4, and upper clamps 5 and lower clamps 6 arranged opposite to each other. The upper clamp 5 includes an upper mounting end 7 and an upper winding end 8. The upper connector 1 is mounted on the upper mounting end 7, and the upper winding shaft 2 is mounted on the upper winding end 8. The upper connector 1 is used to mount on the load sensor of the testing machine. The lower clamp 6 includes a lower mounting end 9 and a lower winding end 10. The lower connector 3 is mounted on the lower mounting end 9, and the lower winding shaft 4 is mounted on the lower winding end 10. The lower connector 3 is used to mount on the base of the testing machine. An upper through hole 11 is opened on the side of the upper winding shaft 2, and a lower through hole 12 is opened on the side of the lower winding shaft 4. The paper 36 includes... The connection consists of an upper end 13, an upper bonding portion 14, a middle portion 15, a lower bonding portion 16, and a lower end 17. The upper end 13 is wound clockwise around the upper winding shaft 2 and then passed counterclockwise through the upper through hole 11 before bonding to the upper bonding portion 14. The lower end 17 is wound counterclockwise around the lower winding shaft 4 and then passed clockwise through the lower through hole 12 before bonding to the lower bonding portion 16. The middle portion 15 is vertically positioned between the upper winding shaft 2 and the lower winding shaft 4. Alternatively, the upper end 13 is wound counterclockwise around the upper winding shaft 2 and then passed clockwise through the upper through hole 11 before bonding to the upper bonding portion 14. The lower end 17 is wound clockwise around the lower winding shaft 4 and then passed counterclockwise through the lower through hole 12 before bonding to the lower bonding portion 16. The middle portion 15 is vertically positioned between the upper winding shaft 2 and the lower winding shaft 4.

[0028] It should be noted that the testing machine is a known existing technology and can be a testing machine with an environmental chamber. The environmental chamber temperature is 350℃ and the loading rate is 100mm / min. The upper end 13 is located in the inner ring and has a force component pointing towards the outer ring sample. The upper bonding part 14 is located in the outer ring and has a force component pointing towards the inner ring sample. The paper 36 is prevented from slipping by its own compressive stress. The paper can be a high-temperature resistant paper base material such as aramid III paper or PBO paper.

[0029] The self-locking fixture for testing the tensile strength of paper provided by this invention includes an upper connector 1, an upper winding shaft 2, a lower connector 3, a lower winding shaft 4, and upper clamps 5 and lower clamps 6 arranged opposite to each other. First, the upper winding shaft 2 is installed on the upper winding end 8 of the upper clamp 5, and the lower winding shaft 4 is installed on the lower winding end 10 of the lower clamp 6. Then, the upper end 13 of the paper 36 is wound clockwise through the upper winding shaft 2 and counterclockwise through the upper through hole 11 and then attached to the upper attachment part 14. The lower end 17 of the paper 36 is wound counterclockwise through the lower winding shaft 4 and... After passing clockwise through the lower through-hole 12, the paper 36 is attached to the lower attachment part 16, with the middle part 15 of the paper 36 vertically positioned between the upper winding shaft 2 and the lower winding shaft 4; or, the upper end 13 of the paper 36 is wound counterclockwise through the upper winding shaft 2 and then clockwise through the upper through-hole 11 before being attached to the upper attachment part 14, and the lower end 17 of the paper 36 is wound clockwise through the lower winding shaft 4 and then counterclockwise through the lower through-hole 12 before being attached to the lower attachment part 16, with the middle part 15 of the paper 36 vertically positioned between the upper winding shaft 2 and the lower winding shaft 4; finally, the upper connector 1 is installed on the load sensor of the testing machine, and the lower connector 3 is installed on the base of the testing machine. The testing machine is then turned on to perform a tensile strength test on the paper 36. The self-locking fixture for paper tensile strength testing provided by this invention simplifies the fixture structure and maintains the accuracy of the test results when performing tensile strength testing on paper 36 in a high-temperature environment.

[0030] As shown in Figures 1, 3, 4, and 5, the upper clamp 5 includes an upper plate 18, a first side plate 19, and a second side plate 20. The upper plate 18 includes an upper mounting surface and an upper connecting surface that face each other. The upper connector 1 is mounted on the upper mounting surface. The first side plate 19 and the second side plate 20 are mounted opposite each other on the upper connecting surface. The end of the first side plate 19 away from the upper plate 18 includes a first side surface 21, which has a first upper mounting hole. The end of the second side plate 20 away from the upper plate 18 includes a second side surface, which faces away from the first side surface 21 and has a second upper mounting hole. The upper winding shaft 2 passes through the first upper mounting hole and the second upper mounting hole in sequence and is rotatably mounted. The lower clamp 6 is mounted on the upper clamp 5. The lower clamp 6 includes a lower plate 22, a third side plate 23, and a fourth side plate 24. The lower plate 22 includes a lower mounting surface and a lower connecting surface that are arranged opposite to each other. The lower connector 3 is mounted on the lower mounting surface. The third side plate 23 and the fourth side plate 24 are mounted opposite to each other on the lower connecting surface. The end of the third side plate 23 away from the lower plate 22 includes a third side surface 25. The third side surface 25 has a first lower mounting hole. The end of the fourth side plate 24 away from the lower plate 22 includes a fourth side surface. The third side surface 25 and the fourth side surface are arranged opposite to each other. The fourth side surface has a second lower mounting hole. The lower winding shaft 4 passes through the first lower mounting hole and the second lower mounting hole in sequence and is rotatably mounted on the lower clamp 6. In this embodiment, the upper winding shaft 2 is rotatably mounted on the upper clamp 5, thereby facilitating the adjustment of the upper end portion 13 of the paper 36 to be more tightly attached to the upper bonding portion 14. Through the surface adhesion between the upper end portion 13 and the upper bonding portion 14, that is, the squeezing force between the upper end portion 13 and the upper bonding portion 14, the tendency of the paper 36 to slip due to relative displacement during the tensile strength test is avoided, thus realizing the self-locking of the paper 36 and improving the accuracy of the test results of the self-locking clamp for the paper tensile strength test.

[0031] As shown in Figures 1 and 4, the system also includes a first upper anti-rotation pin 26 and a second upper anti-rotation pin 27. The end of the first side plate 19 away from the upper plate 18 also includes a fifth side plate 28 perpendicularly connected to the first side plate 21, with a first upper positioning hole 37. The end of the second side plate 20 away from the upper plate 18 also includes a sixth side plate 29 perpendicularly connected to the second side plate, with a second upper positioning hole 38. The first upper anti-rotation pin 26 passes through the first upper positioning hole 37 and the first upper mounting hole sequentially and is then mounted on the first side plate 19. The second upper anti-rotation pin 27 passes through the second upper positioning hole 38 and the second upper mounting hole sequentially and is then mounted on the second side plate 20. In this embodiment, after the paper 36 is wound on the upper winding shaft 2, the first upper anti-rotation pin 26 and the second upper anti-rotation pin 27 can prevent the upper winding shaft 2 from rotating during the tensile strength test of the paper 36, thus improving the structural stability of the self-locking fixture for the paper tensile strength test.

[0032] As shown in Figures 1 and 5, the device also includes a first lower anti-rotation pin 30 and a second lower anti-rotation pin 31. The end of the third side plate 23 away from the lower plate 22 also includes a seventh side perpendicularly connected to the third side surface 25, with a first lower positioning hole 39. The end of the fourth side plate 24 away from the lower plate 22 also includes an eighth side perpendicularly connected to the fourth side surface, with a second lower positioning hole 40. The first lower anti-rotation pin 30 passes through the first lower positioning hole 39 and the first lower mounting hole in sequence and is then mounted on the third side plate 23. The second lower anti-rotation pin 31 passes through the second lower positioning hole 40 and the second lower mounting hole in sequence and is then mounted on the fourth side plate 24. In this embodiment, after the paper 36 is wound on the lower winding shaft 4, the first lower anti-rotation pin 30 and the second lower anti-rotation pin 31 can prevent the lower winding shaft 4 from rotating during the tensile strength test of the paper 36, thus improving the structural stability of the self-locking fixture for the paper tensile strength test.

[0033] As shown in Figure 1, an upper locking nut 32 is provided at one end of the upper connector 1 near the upper clamp 5. In this embodiment, the upper locking nut 32 can securely install the upper connector 1 on the load sensor of the testing machine, thereby improving the structural stability of the self-locking clamp for paper tensile strength testing. The upper connector 1 can be a rigid pin connection adapter or an O-type connector, and the upper locking nut 32 can be an O-type connector locking nut.

[0034] As shown in Figure 1, a lower locking nut 33 is provided at one end of the lower connector 3 near the lower clamp 6. In this embodiment, the lower locking nut 33 can securely install the lower connector 3 on the base of the testing machine, improving the structural stability of the self-locking clamp for paper tensile strength testing. The lower connector 3 can be a rigid pin connection adapter or a D-type connector, and the lower locking nut 33 can be a D-type connector locking nut.

[0035] As shown in Figures 1 and 6, the upper through hole 11 is located at the center of the side of the upper winding shaft 2, and the lower through hole 12 is located at the center of the side of the lower winding shaft 4. In this embodiment, both the upper through hole 11 and the lower through hole 12 are located at the center, which can more easily ensure that the middle part 15 of the paper 36 is vertically positioned between the upper winding shaft 2 and the lower winding shaft 4, thereby improving the ease of use and installation of the self-locking fixture for paper tensile strength testing.

[0036] As shown in Figure 1, the upper connector 1 has an upper pin hole 34 at the end away from the upper clamp 5, and the lower connector 3 has a lower pin hole 35 at the end away from the lower clamp 6. In this embodiment, the testing machine is equipped with an upper pin and a lower pin. The upper pin, through the upper pin hole 34, allows the upper connector 1 to be conveniently installed on the load sensor of the testing machine, and the lower pin, through the lower pin hole 35, allows the lower connector 3 to be conveniently installed on the base of the testing machine, thus improving the ease of use and installation of the self-locking fixture for paper tensile strength testing.

[0037] As shown in Figures 1 to 7, based on the same inventive concept, this invention also provides a method for using a self-locking clamp for testing the tensile strength of paper. The method involves using the self-locking clamp for testing the tensile strength of paper 36 according to any of the aforementioned embodiments to perform a tensile strength test, including the following steps: Step 1: Install the upper winding shaft 2 on the upper winding end 8 of the upper clamp 5, and install the lower winding shaft 4 on the lower winding end 10 of the lower clamp 6; Step 2: Wind the upper end 13 of the paper 36 clockwise through the upper winding shaft 2 and counterclockwise through the upper through hole 11, then attach it to the upper bonding part 14; Wind the lower end 17 of the paper 36 counterclockwise through the lower winding shaft 4 and clockwise through the lower through hole 12, then attach it to the upper bonding part 14. The lower bonding part 16 is used to vertically position the middle part 15 of the paper 36 between the upper winding shaft 2 and the lower winding shaft 4; or the upper end 13 of the paper 36 is wound counterclockwise through the upper winding shaft 2 and clockwise through the upper through hole 11 and then bonded to the upper bonding part 14; the lower end 17 of the paper 36 is wound clockwise through the lower winding shaft 4 and counterclockwise through the lower through hole 12 and then bonded to the lower bonding part 16, with the middle part 15 of the paper 36 vertically positioned between the upper winding shaft 2 and the lower winding shaft 4; Step 3: Install the upper connector 1 on the load sensor of the testing machine and install the lower connector 3 on the base of the testing machine; Step 4: Turn on the testing machine and perform a tensile strength test on the paper 36.

[0038] The present invention provides a self-locking fixture and method for testing the tensile strength of paper. The self-locking fixture includes an upper connector 1, an upper winding shaft 2, a lower connector 3, a lower winding shaft 4, and upper clamps 5 and lower clamps 6 arranged opposite to each other. First, the upper winding shaft 2 is installed on the upper winding end 8 of the upper clamp 5, and the lower winding shaft 4 is installed on the lower winding end 10 of the lower clamp 6. Then, the upper end 13 of the paper 36 is wound clockwise through the upper winding shaft 2 and counterclockwise through the upper through hole 11 and then attached to the upper bonding part 14. The lower end 17 of the paper 36 is wound counterclockwise through the lower winding shaft 4 and clockwise through the lower through hole 12 and then attached to the lower bonding part. 16. The middle portion 15 of the paper 36 is vertically positioned between the upper winding shaft 2 and the lower winding shaft 4; or the upper end portion 13 of the paper 36 is wound counterclockwise through the upper winding shaft 2 and clockwise through the upper through hole 11 and then attached to the upper bonding portion 14, the lower end portion 17 of the paper 36 is wound clockwise through the lower winding shaft 4 and counterclockwise through the lower through hole 12 and then attached to the lower bonding portion 16, and the middle portion 15 of the paper 36 is vertically positioned between the upper winding shaft 2 and the lower winding shaft 4; finally, the upper connector 1 is installed on the load sensor of the testing machine, the lower connector 3 is installed on the base of the testing machine, the testing machine is turned on, and the tensile strength test of the paper 36 is performed. The paper tensile strength testing self-locking fixture and its usage method provided by the present invention simplify the fixture structure and can maintain the accuracy of the test results when performing tensile strength testing on the paper 36 in a high-temperature environment.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions 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. A self-locking fixture for testing the tensile strength of paper, characterized in that, It includes an upper connector, an upper winding shaft, a lower connector, a lower winding shaft, and upper and lower clamps arranged opposite each other, wherein: The upper clamp includes an upper mounting end and an upper winding end. The upper connector is mounted on the upper mounting end, and the upper winding shaft is mounted on the upper winding end. The upper connector is used to mount on the load sensor of the testing machine. The lower clamp includes a lower mounting end and a lower winding end. The lower connector is mounted on the lower mounting end, and the lower winding shaft is mounted on the lower winding end. The lower connector is used to mount on the base of the testing machine. The upper winding shaft has an upper through hole on its side, and the lower winding shaft has a lower through hole on its side. The paper includes an upper end, an upper bonding part, a middle part, a lower bonding part, and a lower end connected in sequence. The upper end is wound clockwise around the upper winding shaft and then passes counterclockwise through the upper through hole before being attached to the upper fitting portion; the lower end is wound counterclockwise around the lower winding shaft and then passes clockwise through the lower through hole before being attached to the lower fitting portion; the middle portion is vertically disposed between the upper winding shaft and the lower winding shaft; or The upper end is wound counterclockwise through the upper winding shaft and clockwise through the upper through hole before being attached to the upper bonding part; the lower end is wound clockwise through the lower winding shaft and counterclockwise through the lower through hole before being attached to the lower bonding part; the middle part is vertically disposed between the upper winding shaft and the lower winding shaft.

2. The self-locking fixture for testing the tensile strength of paper according to claim 1, characterized in that, The upper clamp includes an upper plate, a first side plate, and a second side plate. The upper plate includes an upper mounting surface and an upper connecting surface that are disposed opposite to each other. The upper connector is mounted on the upper mounting surface. The first side plate and the second side plate are mounted opposite to each other on the upper connecting surface. The end of the first side plate away from the upper plate includes a first side surface, which has a first upper mounting hole. The end of the second side plate away from the upper plate includes a second side surface, which is disposed opposite to the first side surface. The second side surface has a second upper mounting hole. The upper winding shaft passes through the first upper mounting hole and the second upper mounting hole in sequence and is rotatably mounted on the upper clamp. The lower clamp includes a lower plate, a third side plate, and a fourth side plate. The lower plate includes a lower mounting surface and a lower connecting surface that are arranged opposite to each other. The lower connector is mounted on the lower mounting surface. The third side plate and the fourth side plate are mounted opposite to each other on the lower connecting surface. The end of the third side plate away from the lower plate includes a third side surface, which has a first lower mounting hole. The end of the fourth side plate away from the lower plate includes a fourth side surface, which is arranged opposite to each other. The fourth side surface has a second lower mounting hole. The lower winding shaft passes through the first lower mounting hole and the second lower mounting hole in sequence and is rotatably mounted on the lower clamp.

3. The self-locking fixture for testing the tensile strength of paper according to claim 2, characterized in that, It also includes a first upper anti-rotation pin and a second upper anti-rotation pin. The end of the first side plate away from the upper plate also includes a fifth side plate that is perpendicularly connected to the first side plate. The fifth side plate has a first upper positioning hole. The end of the second side plate away from the upper plate also includes a sixth side plate that is perpendicularly connected to the second side plate. The sixth side plate has a second upper positioning hole. The first upper anti-rotation pin passes through the first upper positioning hole and the first upper mounting hole in sequence and is then installed on the first side plate. The second upper anti-rotation pin passes through the second upper positioning hole and the second upper mounting hole in sequence and is then installed on the second side plate.

4. The self-locking fixture for testing the tensile strength of paper according to claim 2, characterized in that, It also includes a first lower stop pin and a second lower stop pin. The end of the third side plate away from the lower plate also includes a seventh side plate that is perpendicularly connected to the third side plate. The seventh side plate has a first lower positioning hole. The end of the fourth side plate away from the lower plate also includes an eighth side plate that is perpendicularly connected to the fourth side plate. The eighth side plate has a second lower positioning hole. The first lower stop pin passes through the first lower positioning hole and the first lower mounting hole in sequence and is then installed on the third side plate. The second lower stop pin passes through the second lower positioning hole and the second lower mounting hole in sequence and is then installed on the fourth side plate.

5. The self-locking fixture for testing the tensile strength of paper according to claim 1, characterized in that, The upper connector is provided with an upper locking nut at one end near the upper clamp.

6. The self-locking fixture for testing the tensile strength of paper according to claim 1, characterized in that, A lower locking nut is provided at one end of the lower connector near the lower clamp.

7. The self-locking fixture for testing the tensile strength of paper according to claim 1, characterized in that, The upper through hole is located in the middle of the side surface of the upper winding shaft, and the lower through hole is located in the middle of the side surface of the lower winding shaft.

8. The self-locking fixture for testing the tensile strength of paper according to claim 1, characterized in that, The upper connector has an upper pin hole at one end away from the upper clamp, and the lower connector has a lower pin hole at one end away from the lower clamp.

9. A method of using a self-locking fixture for testing the tensile strength of paper, comprising using the self-locking fixture for testing the tensile strength of paper according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Install the upper winding shaft on the upper winding end of the upper clamp, and install the lower winding shaft on the lower winding end of the lower clamp; Step 2: Wrap the upper end of the paper clockwise around the upper winding shaft and then counterclockwise through the upper through-hole, attaching it to the upper bonding part; wrap the lower end of the paper counterclockwise around the lower winding shaft and then clockwise through the lower through-hole, attaching it to the lower bonding part; place the middle part of the paper vertically between the upper and lower winding shafts; or The upper end of the paper is wound counterclockwise through the upper winding shaft and then clockwise through the upper through hole and attached to the upper bonding part; the lower end of the paper is wound clockwise through the lower winding shaft and then counterclockwise through the lower through hole and attached to the lower bonding part; the middle part of the paper is vertically placed between the upper winding shaft and the lower winding shaft. Step 3: Install the upper connector onto the load sensor of the testing machine, and install the lower connector onto the base of the testing machine; Step 4: Turn on the testing machine and perform a tensile strength test on the paper.

Images