Hemp fiber tear test fixture and test method
The hemp fiber tearing test fixture addresses inefficiencies in existing tensile testing machines by integrating a 180-degree flipping and scissor mechanism for one-time clamping and cutting, improving test efficiency and clamping quality.
Patent Information
- Application Number
- CN202411340659.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2044-09-25
AI Technical Summary
Existing tensile testing machines for hemp fibers require multiple pre-cutting and sequential clamping steps, reducing test efficiency and increasing time consumption.
A hemp fiber tearing test fixture equipped with a 180-degree flipping mechanism and a scissor mechanism that allows one-time clamping and simultaneous cutting of samples, utilizing a 180-degree opening and closing finger cylinder with elastic clamping pieces and a scissor mechanism for efficient sample preparation.
The fixture enables one-time clamping and cutting of hemp fiber samples, enhancing test efficiency by eliminating pre-cutting steps and ensuring high-quality clamping without sample skewing or wrinkling.
Smart Images
Figure CN118857979B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of tensile testing machines, in particular to a hemp fiber tearing test fixture and a test method. Background Art
[0002] When inspecting the quality of hemp fibers, the main thing to do is to test the tear strength of hemp fibers. According to national regulations, for hemp fibers of a certain length and quality, the higher the tear strength, the better the quality. Currently, the main equipment for testing tear strength is a tensile tester.
[0003] The existing tensile testing machine has an upper clamp and a lower clamp arranged above and below. Before the tensile test, the sample needs to be cut first, and then the cut sample is clamped between the upper clamp and the lower clamp, and then the tensile test is performed. When testing multiple groups of samples, repeated pre-cutting of the samples will also take a certain amount of time. Secondly, when clamping the sample, the two ends need to be clamped in sequence, which will increase certain test steps and time, and reduce the test efficiency. In view of this, the present application proposes a highly efficient hemp fiber tearing test fixture and test method. Summary of the invention
[0004] The object of the present invention is to provide a jig and a test method for a hemp fiber tear test, so as to solve the problems raised in the above-mentioned background technology.
[0005] The above-mentioned object of the present invention is achieved through the following technical solutions:
[0006] A jig for testing tearing of hemp fibers comprises a base, wherein a lower jig and a column-type screw rod are arranged on the base, a nut is arranged on the screw rod, an upper jig is arranged on the nut, tension sensors are arranged in the lower jig and the upper jig, a 180-degree flipping mechanism is arranged on the nut, the output end of the 180-degree flipping mechanism is connected to the upper jig, the lower jig and the upper jig are arranged front and back on a horizontal plane, and the two jig heads of the lower jig / upper jig are distributed left and right; when the 180-degree flipping mechanism runs to the bottom, the upper jig flips upward and is at the same horizontal height as the lower jig, and the 180-degree flipping mechanism is operated by When the bottom moves upward, the upper clamp flips downward and has a height difference with the lower clamp; the upper clamp is a finger cylinder, and a scissor mechanism is provided on the front side wall of the finger cylinder, and the scissor mechanism includes a shell fixed to the front side wall of the finger cylinder, and scissor blades hinged on the left and right sides of the top of the shell and can be opened and closed, a pull tab is provided in the middle of the shell along the vertical sliding, and connecting rods are hinged on the left and right sides of the top of the pull tab, and the other end of the connecting rod is hinged to the corresponding scissor blade, the piston rod output end of the finger cylinder is connected with a shaft rod, and the shaft rod is connected to the lower part of the pull tab, and a waist-shaped hole for the shaft rod to move up and down is provided on the front side wall of the finger cylinder.
[0007] Optionally, the upper clamp is a 180-degree opening and closing finger cylinder, and the facing surfaces of the two clamp heads of the 180-degree opening and closing finger cylinder are elastically provided with upper clamping pieces, and the upper clamping pieces are closed before the scissors mechanism to elastically clamp.
[0008] Optionally, the opposite back surfaces of the two upper clamps are connected with guide rods, the guide rods are slidably matched with the clamp head, and a spring is provided between the upper clamp and the clamp head and on the outer sleeve of the guide rod.
[0009] Optionally, the lower clamp is a parallel finger cylinder.
[0010] Optionally, a nut seat is connected to the bottom of the nut, and the front side of the nut seat is connected to the 180-degree flip mechanism, the 180-degree flip mechanism includes an L-shaped block connected to the front side of the nut seat, the middle part of the L-shaped block is rotatably connected and penetrated by a flip rod, the front end of the flip rod is fixedly connected to the upper clamp, the rear end of the flip rod is fixedly connected to a rotating bar, the rear of the rotating bar is provided with a limiting roller that rotates through a rotating shaft, a vertical limiting plate is fixedly provided on the right side of the screw rod, and a limiting groove rail matching the limiting roller is penetrated on the limiting plate.
[0011] Optionally, the limiting groove rail is composed of a first vertical groove located at the same horizontal height as the lower clamp, a flip V-shaped groove connected to the upper end of the first vertical groove, and a second vertical groove connected to the upper end of the flip V-shaped groove.
[0012] The hemp fiber tearing test method uses the above-mentioned hemp fiber tearing test fixture to perform a tensile test on a hemp fiber sample, comprising the following steps:
[0013] S1. Adjust the screw rod to make the nut run to the bottom, and turn the upper clamp upward, so that the lower clamp and the upper clamp are in a state of one in front and one behind;
[0014] S2. Place the uncut hemp fiber sample in the clamp heads of the lower clamp and the upper clamp, and adjust the clamp heads of the lower clamp and the upper clamp to close the clamp;
[0015] S3. During the clamping process, the upper clamp drives the scissor mechanism to cut the uncut hemp fiber sample, and then the lower clamp and the upper clamp clamp the front and rear parts of the lower end of the hemp fiber sample respectively;
[0016] S4. Adjust the screw rod to make the nut move upward from the bottom for a short distance, and use the 180-degree flip mechanism to flip the upper fixture downward;
[0017] S5. Perform tensile test on hemp fiber samples.
[0018] Compared with the prior art, the present invention provides a hemp fiber tearing test fixture and test method, which have the following beneficial effects:
[0019] The present invention adds a 180-degree flip mechanism and a scissor mechanism to the upper clamp. The 180-degree flip mechanism can flip the upper clamp to face upward and be at the same level as the lower clamp, thereby achieving one-time clamping. The scissor mechanism can be used to shear the sample during the clamping process of the upper clamp, without the need to pre-cut the sample, and the test process is simple and efficient.
[0020] The upper clamp of the present invention is a 180-degree opening and closing finger cylinder, and an upper clamping piece, a guide rod and a spring are additionally arranged on the upper clamp, so that elastic clamping can be performed before the sample is sheared to ensure the shearing quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the structure of the present invention;
[0022] Figure 2 is a schematic diagram of the upper clamp and the scissor mechanism in the present invention;
[0023] Figure 3 It is a schematic diagram of the 180-degree turning mechanism and the limiting plate in the present invention;
[0024] Figure 4 It is a schematic diagram of the 180-degree flipping mechanism in the present invention.
[0025] In the figure: 1. base; 2. screw rod; 21. nut; 22. nut seat; 3. lower clamp; 4. upper clamp; 41. upper clamp; 42. guide rod; 43. spring; 44. scissor mechanism; 441. shell; 442. pull piece; 443. connecting rod; 444. scissor blade; 5. 180 degree turning mechanism; 51. limit roller; 52. rotating shaft; 53. rotating bar; 54. turning rod; 55. L-shaped block; 6. limit plate; 61. second vertical groove; 62. turning V-shaped groove; 63. first vertical groove. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] See also Figure 1-4As shown, on the one hand, this embodiment proposes a hemp fiber tearing test fixture, including a base 1, on which a lower fixture 3 and a column-type screw rod 2 are provided, a nut 21 is threadedly connected to the screw rod 2, a nut seat 22 is connected to the bottom of the nut 21, and a 180-degree flip mechanism 5 is connected to the front side of the nut seat 22, and tension sensors are provided in the lower fixture 3 and the upper fixture 4. The arrangement of the tension sensors refers to the prior art and will not be repeated here.
[0028] Specifically, the 180-degree flipping mechanism 5 includes an L-shaped block 55 connected to the front side of the nut seat 22, the middle part of the L-shaped block 55 is horizontally connected and rotated along the front-to-back direction and penetrated by a flip rod 54, the front end of the flip rod 54 is fixedly connected to the upper clamp 4, the rear end of the flip rod 54 is fixedly connected to the rotating bar 53, and the rear of the rotating bar 53 is rotated by the rotating shaft 52 to have a limiting roller 51, and a vertical limiting plate 6 is fixedly provided on the right side of the screw rod 2, and a limiting groove rail compatible with the limiting roller 51 is penetrated on the limiting plate 6, and the limiting groove rail is used to limit the 180-degree flipping action of the 180-degree flipping mechanism 5 to flip the upper clamp 4 facing downward (upward) to face upward (downward). Among them, the limiting groove rail is composed of a first vertical groove 63 located at the same horizontal height as the lower clamp 3, a flip V-shaped groove 62 connected to the upper end of the first vertical groove 63, and a second vertical groove 61 connected to the upper end of the flip V-shaped groove 62. There is a smooth transition between the first vertical groove 63, the V-shaped groove and the second vertical groove 61, and the second vertical groove 61 extends all the way to the upper part of the screw rod 2.
[0029] The lower clamp 3 and the upper clamp 4 are arranged front and back on the horizontal plane, and the two clamp heads of the lower clamp 3 / upper clamp 4 are distributed left and right; when the 180-degree flip mechanism 5 runs to the bottom, the upper clamp 4 flips to face upward and is at the same horizontal height as the lower clamp 3. When the 180-degree flip mechanism 5 runs from the bottom to the top, the upper clamp 4 flips to face downward and has a height difference with the lower clamp 3. This height difference can be used to straighten the sample and then perform a tensile test. The upper clamp 4 is a 180-degree open and close finger cylinder, and the lower clamp 3 is a parallel finger cylinder. A scissor mechanism 44 is provided on the front side wall of the 180-degree opening and closing finger cylinder. The scissor mechanism 44 includes a shell 441 fixed on the front side wall of the 180-degree opening and closing finger cylinder, and scissor blades 444 hinged on the left and right sides of the top of the shell 441 and can be opened and closed. A pull tab 442 is provided in the middle of the shell 441 for vertical sliding. Connecting rods 443 are hinged on the left and right sides of the top of the pull tab 442. The other end of the connecting rod 443 is hinged to the corresponding scissor blade 444. A shaft rod is connected to the output end of the piston rod of the finger cylinder, and the shaft rod is connected to the lower part of the pull tab 442. A waist-shaped hole for the shaft rod to move up and down is provided on the front side wall of the finger cylinder (the shaft rod and the waist-shaped hole are not shown). The upper clamp 4 can be flipped upward and at the same horizontal height as the lower clamp 3 through the 180-degree flipping mechanism 5. At this time, the front and rear parts of the bottom end of the sample are placed in the clamp heads of the lower clamp 3 and the upper clamp 4 respectively. Only one clamping action is required. During the clamping process of the upper clamp 4, the piston rod of the finger cylinder moves downward, which will synchronously pull the pull tab 442 downward, thereby driving the scissor mechanism 44 to complete the shearing action. The scissor mechanism 44 can be used to shear the sample, so there is no need to pre-cut the sample. The overall testing process is simple and efficient.
[0030] On the basis of the above embodiment, the two clamp heads of the 180-degree opening and closing finger cylinder are elastically provided with upper clamps 41 on the opposite sides, and the opposite sides of the two upper clamps 41 are connected with guide rods 42, which are slidably matched with the clamp heads, and springs 43 are provided between the upper clamps 41 and the clamp heads and on the outer sleeves of the guide rods 42. When the upper clamp 4 performs the clamping action, the upper clamp 41 will close before the scissor mechanism 44 to elastically clamp the sample, so as to avoid the sample from being skewed or wrinkled during the shearing process and affecting the shearing quality, so the shearing quality can be guaranteed.
[0031] On the other hand, this embodiment provides a hemp fiber tearing test method, which uses the above-mentioned hemp fiber tearing test fixture to perform a tensile test on a hemp fiber sample, including the following steps:
[0032] S1. Adjust the screw rod 2 so that the nut 21 runs to the bottom, and flip the upper clamp 4 to face upward, so that the lower clamp 3 and the upper clamp 4 are in a front-and-rear state;
[0033] S2. The uncut hemp fiber sample is placed in the clamp heads of the lower clamp 3 and the upper clamp 4, and the clamp heads of the lower clamp 3 and the upper clamp 4 are adjusted to close the clamp;
[0034] S3. During the clamping process, the upper clamp 4 drives the scissor mechanism 44 to cut the uncut hemp fiber sample, and then the lower clamp 3 and the upper clamp 4 respectively clamp the front and rear parts of the lower end of the hemp fiber sample;
[0035] S4. Adjust the screw rod 2 so that the nut 21 runs a short distance upward from the bottom, and use the 180-degree flip mechanism 5 to flip the upper fixture 4 to face downward;
[0036] S5. Perform tensile test on hemp fiber samples.
[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A jig for testing hemp fiber tearing, comprising a base (1), wherein a lower jig (3) and a column-type screw rod (2) are arranged on the base (1), a nut (21) is arranged on the screw rod (2), an upper jig (4) is arranged on the nut (21), and tension sensors are arranged in both the lower jig (3) and the upper jig (4), characterized in that: The nut (21) is provided with a 180-degree turning mechanism (5), the output end of the 180-degree turning mechanism (5) is connected to the upper clamp (4), the lower clamp (3) and the upper clamp (4) are arranged front and back on a horizontal plane, and the two clamp heads of the lower clamp (3) / upper clamp (4) are distributed left and right; when the 180-degree turning mechanism (5) runs to the bottom, the upper clamp (4) turns upward and is at the same horizontal height as the lower clamp (3); when the 180-degree turning mechanism (5) runs from the bottom to the top, the upper clamp (4) turns downward and has a height difference with the lower clamp (3); the upper clamp (4) is a finger cylinder, A scissor mechanism (44) is provided on the front side wall of the finger cylinder, and the scissor mechanism (44) includes a shell (441) fixed on the front side wall of the finger cylinder, and scissor blades (444) hingedly arranged on the left and right sides of the top of the shell (441) and can be opened and closed. A pull tab (442) is provided in the middle of the shell (441) for vertical sliding, and connecting rods (443) are hingedly arranged on the left and right sides of the top of the pull tab (442), and the other end of the connecting rod (443) is hingedly arranged with the corresponding scissor blade (444). The output end of the piston rod of the finger cylinder is connected to a shaft rod, and the shaft rod is connected to the lower part of the pull tab (442). The front side wall of the finger cylinder is provided with a waist-shaped hole for the shaft rod to move up and down.
2. The jig for testing hemp fiber tearing according to claim 1, characterized in that: The upper clamp (4) is a 180-degree opening and closing finger cylinder, and the two clamp heads of the 180-degree opening and closing finger cylinder are elastically provided with upper clamping pieces (41) on the facing surfaces. The upper clamping pieces (41) are closed before the scissor mechanism (44) to elastically clamp.
3. The jig for testing hemp fiber tearing according to claim 2, characterized in that: The opposite back surfaces of the two upper clamping pieces (41) are connected with guide rods (42), the guide rods (42) are slidably matched with the clamp head, and a spring (43) is provided between the upper clamping piece (41) and the clamp head and on the outer sleeve of the guide rods (42).
4. The jig for testing hemp fiber tearing according to claim 1, characterized in that: The lower clamp (3) is a parallel finger cylinder.
5. The jig for testing hemp fiber tearing according to claim 1, characterized in that: The bottom of the nut (21) is connected to a nut seat (22), and the front side of the nut seat (22) is connected to the 180-degree flip mechanism (5). The 180-degree flip mechanism (5) includes an L-shaped block (55) connected to the front side of the nut seat (22). The middle part of the L-shaped block (55) is rotatably connected and penetrated by a flip rod (54). The front end of the flip rod (54) is fixedly connected to the upper clamp (4), and the rear end of the flip rod (54) is fixedly connected to a rotating bar (53). The rear of the rotating bar (53) is rotated by a rotating shaft (52) to form a limiting roller (51). A vertical limiting plate (6) is fixedly provided on the right side of the screw rod (2), and a limiting groove rail compatible with the limiting roller (51) is penetrated on the limiting plate (6).
6. The jig for testing hemp fiber tearing according to claim 5, characterized in that: The limiting groove rail is composed of a first vertical groove (63) located at the same horizontal height as the lower clamp (3), a flip V-shaped groove (62) connected to the upper end of the first vertical groove (63), and a second vertical groove (61) connected to the upper end of the flip V-shaped groove (62).
7. Test method for tearing of hemp fibers, characterized in that: The method of using the hemp fiber tear test fixture according to any one of claims 1 to 6 to perform a tensile test on a hemp fiber sample comprises the following steps: S1. Adjust the screw rod (2) so that the nut (21) runs to the bottom, and flip the upper clamp (4) upward so that the lower clamp (3) and the upper clamp (4) are in a front-and-rear position; S2. The uncut hemp fiber sample is placed in the clamp heads of the lower clamp (3) and the upper clamp (4), and the clamp heads of the lower clamp (3) and the upper clamp (4) are adjusted to close the clamp; S3. During the clamping process, the upper clamp (4) drives the scissor mechanism (44) to cut the uncut hemp fiber sample, and then the lower clamp (3) and the upper clamp (4) respectively clamp the front and rear parts of the lower end of the hemp fiber sample; S4. Adjust the screw (2) so that the nut (21) runs a short distance upward from the bottom, and use the 180-degree flip mechanism (5) to flip the upper fixture (4) to face downward; S5. Perform tensile test on hemp fiber samples.