Sample preparation equipment for tensile strength of carbon fibers

Abstract

The invention belongs to the technical field of carbon fiber sample preparation, and particularly relates to carbon fiber tensile strength sample preparation equipment which comprises a sample preparation table, a fixing frame is fixedly arranged on the sample preparation table, two hydraulic cylinders are fixedly arranged on the fixing frame, and the output ends of the two hydraulic cylinders are jointly and fixedly connected with a supporting frame. According to the invention, the cutting mechanism can be automatically controlled to carry out cutting sample preparation on the carbon fiber tube, the labor loss caused by the traditional manual handheld cutting equipment operation is effectively avoided, in addition, the cutting distance can be fixed in advance, so that the subsequent tedious procedures of re-measuring each carbon fiber tube and delimiting the cutting position are avoided, and the production efficiency is improved. And meanwhile, in the cutting process, a dust collection mechanism is further arranged to effectively treat dust generated by cutting, and pollution of the dust to the surrounding environment is practically avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber sample preparation, and in particular relates to a sample preparation device for carbon fiber tensile strength. Background Art

[0002] In today's era of rapid technological development, carbon fiber materials have great application potential in many fields with their outstanding performance. Among them, in the aerospace field, carbon fiber tubes can reduce the weight and improve the performance of aircraft with their high strength and lightweight characteristics, and ensure the stability and reliability of the structure in extreme flight environments; in the automotive industry, carbon fiber tubes can be used to manufacture high-performance body parts and chassis structures, reduce the weight of the whole vehicle, improve fuel efficiency, and enhance the vehicle's handling and safety; in sports equipment, such as bicycle frames, golf clubs, etc., the use of carbon fiber tubes can provide better strength and rigidity, and improve the performance of sports equipment. In view of the wide application of carbon fiber tubes under these complex working conditions, accurate evaluation of their tensile strength is crucial to ensure their reliability and safety in various usage scenarios.

[0003] At present, when the tensile strength test of carbon fiber tube is carried out, the first task is to prepare the sample of standard length. In the existing sample preparation method, the carbon fiber tube is usually carefully cut and prepared by manual hand-held cutting equipment according to the pre-drawn cutting line, so as to obtain the required specific length of carbon fiber tube sample. However, since the number of samples required for each batch is often large, this process will consume a lot of manpower. Specifically, for each carbon fiber tube processed, the staff needs to carefully measure again and re-define the cutting line. The whole sample preparation process is extremely cumbersome. This cumbersome operation not only greatly affects the sample preparation efficiency, but also easily leads to human errors, thereby affecting the accuracy of the subsequent tensile strength test results. In addition, a large amount of dust will inevitably be generated during the cutting process. If the dust is not effectively handled, it will float around and cause serious pollution to the surrounding environment. On the one hand, dust pollution may cause harm to the health of operators and cause health problems such as respiratory diseases. On the other hand, it will also have an adverse effect on the environmental quality of the workplace.

[0004] To this end, we propose a sample preparation device for carbon fiber tensile strength to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a sample preparation device for carbon fiber tensile strength in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a sample preparation device for the tensile strength of carbon fiber, comprising a sample preparation table, a fixed frame is fixedly arranged on the sample preparation table, and two hydraulic cylinders are fixedly arranged on the fixed frame, the output ends of the two hydraulic cylinders are commonly fixedly connected to a support frame, a bidirectional screw is rotatably arranged on the support frame, and two symmetrically arranged threaded blocks are threadedly connected on the bidirectional screw, a limit rod is fixedly arranged on the support frame, and the two threaded blocks are evenly connected by the limit rod for sliding connection, a cutting mechanism is fixedly arranged on the two threaded blocks, a power control mechanism matched with the two cutting mechanisms is fixedly arranged on one side of the fixed frame, two support seats are fixedly arranged on the sample preparation table, and a clamping mechanism is arranged on the support seat, and a dust suction mechanism is arranged on the sample preparation table.

[0007] In the above-mentioned sample preparation equipment for carbon fiber tensile strength, the cutting mechanism includes a cutting frame, a cutting knife and a cutting motor, the cutting frame is fixedly connected to the corresponding threaded block, and the cutting motor is fixedly arranged on the cutting frame, the cutting knife is rotatably arranged on the cutting frame, and one end of the transmission shaft of the cutting knife is transmission-connected to the cutting motor.

[0008] In the above-mentioned sample preparation equipment for the tensile strength of carbon fiber, the power control mechanism includes a control box, a sliding rheostat, a nut seat and a screw rod. The control box is fixedly arranged on one side of the fixed frame, and the sliding rheostat is fixedly arranged in the control box. The nut seat is rotatably arranged on the control box, and the screw rod is threadedly connected to the nut seat. The lower end of the screw rod is fixedly connected to the sliding end of the sliding rheostat through an insulating block, and the sliding rheostat is electrically connected to two cutting motors.

[0009] In the above-mentioned sampling equipment for carbon fiber tensile strength, a worm is rotatably arranged in the regulating box, and one end of the worm passes through the regulating box and is fixedly connected to a knob, a worm wheel is fixedly sleeved on the lower side of the nut seat, and the worm wheel is meshed with the worm, and the unfolded helix angle of the worm is smaller than the friction angle between the worm and the worm wheel.

[0010] In the above-mentioned sample preparation equipment for the tensile strength of carbon fiber, the clamping mechanism includes a clamping frame, a cylinder, an upper clamping seat and a lower clamping seat, the clamping frame and the lower clamping seat are both fixedly arranged on the corresponding support seat, the cylinder is fixedly arranged on the clamping frame, and the output end of the cylinder is fixedly connected to the upper clamping seat, the upper clamping seat is arranged opposite to the lower clamping seat, and the upper clamping seat and the lower clamping seat are both arranged in an arc shape.

[0011] In the above-mentioned sample preparation equipment for carbon fiber tensile strength, the dust suction mechanism includes a dust suction chamber, a dust suction port, a dust hood and a vacuum cleaner. The dust suction chamber and the dust suction port are both opened on the sample preparation table, and the dust suction port is connected with the dust suction chamber. The dust suction hood is fixedly arranged in the dust suction chamber, and the dust suction hood is arranged at the dust suction port. The vacuum cleaner is fixedly arranged on one side of the sample preparation table, and the input end of the vacuum cleaner is connected with the dust suction hood through a dust suction pipe.

[0012] In the above-mentioned sample preparation device for tensile strength of carbon fiber, a pointer is fixedly provided on the upper end of the screw rod, and a power scale plate matching with the pointer is fixedly provided on one side of the fixing frame.

[0013] In the above-mentioned sample preparation equipment for carbon fiber tensile strength, electric cylinders are fixedly installed on both sides of the fixed frame, and positioning clamps are fixedly installed on the output ends of the two electric cylinders, and the center between the two positioning clamps and the center between the two cutting knives are on the same center line.

[0014] In the above-mentioned sample preparation equipment for carbon fiber tensile strength, one end of the bidirectional lead screw passes through the support frame and is fixedly connected to a handle, and the thread lead angle of the bidirectional lead screw is smaller than the equivalent friction angle.

[0015] Compared with the existing technology, the advantages of a sample preparation device for carbon fiber tensile strength are: 1. Improve operational convenience: The setting of the handle makes it convenient for the staff to control the rotation of the bidirectional lead screw to adjust the distance between the two cutting mechanisms. At the same time, the thread lead angle of the bidirectional lead screw is smaller than the equivalent friction angle, which can achieve self-locking between the bidirectional lead screw and the thread block, avoiding the tedious manual locking and improving the convenience and stability of operation.

[0016] The transmission coordination of the worm and the worm wheel makes it convenient for the user to control the rotation of the nut seat through the knob. The unfolded helix angle of the worm is smaller than the friction angle between the worm and the worm wheel, which can achieve self-locking between the worm and the worm wheel without manual locking, making the adjustment of the cutting motor power more convenient and quick.

[0017] 2. Reduce labor intensity: 1. The hydraulic cylinder can control the cutting mechanism to automatically move down for cutting, avoiding the labor loss caused by long-term manual hand-held cutting equipment and reducing the labor intensity of operators.

[0018] 2. The upper clamping seat can be controlled to move up and down by the provided cylinder, and cooperate with the lower clamping seat to realize the rapid clamping, fixing or unlocking of the carbon fiber tube, without the need for manual support, thus reducing the workload of the operator.

[0019] 3. Ensure cutting quality: 1. The two positioning clamps are controlled by the electric cylinder to clamp the carbon fiber tube horizontally, which further ensures the stability of the carbon fiber tube. At the same time, the center between the two clamps and the center between the two cutting knives are on the same center line, which can automatically adjust the cutting position of the carbon fiber tube. When the two cutting mechanisms cut the carbon fiber tube, they can ensure that both sides of the carbon fiber tube are evenly stressed, thereby ensuring the stability of the cutting and improving the cutting quality.

[0020] 2. The cutting distance between the two cutting mechanisms can be fixed in advance. When cutting subsequent carbon fiber tubes for sample preparation, there is no need to re-measure and locate the cutting position of each carbon fiber tube, which reduces operating errors and ensures the consistency and accuracy of cutting.

[0021] 4. Good environmental protection: The dust suction mechanism includes a dust suction chamber, a dust suction port, a dust suction hood and a dust cleaner. During the cutting process, the vacuum cleaner is started. Through the cooperation of the dust suction pipe, the dust suction hood and the dust suction port, the dust generated during the cutting process can be sucked and collected to prevent the dust from floating around and polluting the surrounding environment. The machine has good environmental protection performance.

[0022] 5. Accurate power regulation: The sliding rheostat in the power control mechanism is electrically connected to the two cutting motors. The sliding end of the sliding rheostat can be adjusted to move through the cooperation of the nut seat and the screw, thereby adjusting the resistance value of the sliding rheostat connected to the cutting motor, so as to facilitate the precise adjustment of the cutting power of the cutting motor according to needs. At the same time, the cooperation of the pointer and the power scale plate makes it convenient for the staff to accurately control the power adjustment of the cutting motor, thereby improving the accuracy and reliability of the power adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front perspective structural schematic diagram of a sample preparation device for carbon fiber tensile strength provided by the present invention; Figure 2 It is a front view structural schematic diagram of a supporting frame and a cutting mechanism of a sample preparation device for tensile strength of carbon fiber provided by the present invention cooperating with each other; Figure 3 It is a front view structural schematic diagram of a cutting mechanism of a sample preparation device for carbon fiber tensile strength provided by the present invention; Figure 4 It is a front perspective structural schematic diagram of a power regulating mechanism and a power scale plate of a sample preparation device for tensile strength of carbon fiber provided by the present invention cooperating with each other; Figure 5 The present invention provides a schematic side view of the structure of a supporting base and a clamping mechanism that cooperate with each other in a sample preparation device for tensile strength of carbon fiber.

[0024] In the figure: 1 sample preparation table, 2 fixed frame, 3 hydraulic cylinder, 4 support frame, 5 bidirectional lead screw, 6 threaded block, 7 cutting mechanism, 71 cutting frame, 72 cutting knife, 73 cutting motor, 8 power control mechanism, 81 control box, 82 sliding rheostat, 83 nut seat, 84 screw, 9 clamping mechanism, 91 clamping frame, 92 cylinder, 93 upper clamping seat, 94 lower clamping seat, 10 dust suction mechanism, 101 dust suction chamber, 102 dust suction port, 103 dust suction hood, 104 dust collector, 11 insulating block, 12 worm, 13 worm wheel, 14 knob, 15 dust suction pipe, 16 pointer, 17 power scale plate, 18 electric cylinder, 19 positioning clamping plate, 20 handle, 21 support seat, 22 limit rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] like Figure 1-Figure 5 As shown, a sample preparation device for tensile strength of carbon fiber includes a sample preparation table 1, a fixing frame 2 is fixedly arranged on the sample preparation table 1, and two hydraulic cylinders 3 are fixedly arranged on the fixing frame 2, the output ends of the two hydraulic cylinders 3 are commonly fixedly connected to a support frame 4, a bidirectional lead screw 5 is rotatably arranged on the support frame 4, and two symmetrically arranged threaded blocks 6 are threadedly connected to the bidirectional lead screw 5, a limit rod 22 is fixedly arranged on the support frame 4, and the two threaded blocks 6 are evenly connected by the limit rod 22 for sliding connection, one end of the bidirectional lead screw 5 passes through the support frame 4 and is fixedly connected to a turning handle 20, and the thread lead angle of the bidirectional lead screw 5 is less than the equivalent friction angle, and the setting of the turning handle 20 is convenient for the staff to control the rotation of the bidirectional lead screw 5, and the thread lead angle design of the bidirectional lead screw 5 can realize self-locking between the bidirectional lead screw 5 and the thread block 6, avoiding the tediousness of manual locking.

[0027] A cutting mechanism 7 is fixedly arranged on each of the two thread blocks 6. The cutting mechanism 7 includes a cutting frame 71, a cutting knife 72 and a cutting motor 73. The cutting frame 71 is fixedly connected to the corresponding thread block 6, and the cutting motor 73 is fixedly arranged on the cutting frame 71. The cutting knife 72 is rotatably arranged on the cutting frame 71, and one end of the transmission shaft of the cutting knife 72 is transmission-connected to the cutting motor 73. The cutting knife 72 can be controlled to rotate to cut and sample the carbon fiber tube through the arranged cutting motor 73, and under the control of the hydraulic cylinder 3, the cutting mechanism 7 can be controlled to automatically move down for cutting, thereby avoiding the labor loss of manually holding the cutting equipment for a long time; A power regulating mechanism 8 matched with the two cutting mechanisms 7 is fixedly arranged on one side of the fixing frame 2. The power regulating mechanism 8 includes a regulating box 81, a sliding rheostat 82, a nut seat 83 and a screw 84. The regulating box 81 is fixedly arranged on one side of the fixing frame 2, and the sliding rheostat 82 is fixedly arranged in the regulating box 81. The nut seat 83 is rotatably arranged on the regulating box 81, and the screw 84 is threadedly connected with the nut seat 83. The lower end of the screw 84 is fixedly connected with the sliding end of the sliding rheostat 82 through the insulating block 11. The sliding rheostat 82 is electrically connected with the two cutting motors 73. The sliding end of the sliding rheostat 82 can be regulated to move through the cooperation of the nut seat 83 and the screw 84, thereby regulating the resistance value of the sliding rheostat 82 connected to the cutting motor 73, so as to facilitate the adjustment of the cutting power of the cutting motor 73 according to needs. A pointer 16 is fixedly provided at the upper end of the screw rod 84, and a power scale plate 17 cooperating with the pointer 16 is fixedly provided on one side of the fixing frame 2. The cooperation between the pointer 16 and the power scale plate 17 facilitates the staff to accurately control the power adjustment of the cutting motor 73; A worm 12 is rotatably arranged in the regulating box 81, and one end of the worm 12 passes through the regulating box 81 and is fixedly connected to a knob 14. A worm wheel 13 is fixedly sleeved on the lower side of the nut seat 83, and the worm wheel 13 is meshed with the worm 12. The unfolded helix angle of the worm 12 is smaller than the friction angle between the worm 12 and the worm wheel 13. The transmission cooperation between the worm 12 and the worm wheel 13 facilitates the user to control the rotation of the nut seat 83 through the knob 14. The unfolded helix angle design of the worm 12 can realize self-locking between the worm 12 and the worm wheel 13, avoiding the tediousness of manual locking. Two support seats 21 are fixedly arranged on the sample preparation table 1, and a clamping mechanism 9 is arranged on the support seat 21. The clamping mechanism 9 includes a clamping frame 91, a cylinder 92, an upper clamping seat 93 and a lower clamping seat 94. The clamping frame 91 and the lower clamping seat 94 are both fixedly arranged on the corresponding support seat 21. The cylinder 92 is fixedly arranged on the clamping frame 91, and the output end of the cylinder 92 is fixedly connected to the upper clamping seat 93. The upper clamping seat 93 and the lower clamping seat 94 are arranged opposite to each other, and the upper clamping seat 93 and the lower clamping seat 94 are both arranged in an arc shape. The upper clamping seat 93 can be controlled to move up and down by the arranged cylinder 92, and the lower clamping seat 94 can be cooperated with to realize the rapid clamping, fixing or unlocking of the carbon fiber tube, avoiding the tediousness of manual support; Electric cylinders 18 are fixedly provided on both sides of the fixing frame 2, and positioning clamps 19 are fixedly provided on the output ends of the two electric cylinders 18. The center between the two positioning clamps 19 and the center between the two cutting knives 72 are on a center line. The two electric cylinders 18 can be used to control the two positioning clamps 19 to clamp the carbon fiber tube laterally, further ensuring the stability of the placement of the carbon fiber tube, and automatically adjusting the cutting position of the carbon fiber tube, so that the two cutting mechanisms 7 can ensure that both sides of the carbon fiber tube are evenly stressed when cutting the carbon fiber tube, thereby ensuring the stability of the cutting. A dust suction mechanism 10 is provided on the sample preparation table 1, and the dust suction mechanism 10 includes a dust suction chamber 101, a dust suction port 102, a dust hood 103 and a dust collector 104. The dust suction chamber 101 and the dust suction port 102 are both opened on the sample preparation table 1, and the dust suction port 102 is connected with the dust suction chamber 101, the dust hood 103 is fixedly arranged in the dust suction chamber 101, and the dust hood 103 is covered at the dust suction port 102, the dust collector 104 is fixedly arranged on one side of the sample preparation table 1, and the input end of the dust collector 104 is connected with the dust hood 103 through the dust suction pipe 15. Through the set vacuum cleaner 104, the dust generated during the cutting process can be sucked in cooperation with the dust suction pipe 15, the dust hood 103 and the dust suction port 102 to prevent the dust from floating randomly and polluting the surrounding environment.

[0028] The operating principle of the present invention is now described as follows: When using the device, the carbon fiber tube to be sampled is placed on the two lower clamping seats 94, and then the two positioning clamps 19 are controlled by the electric cylinder 18 to approach each other, and the two positioning clamps 19 move the same distance until the two positioning clamps 19 achieve transverse clamping of the carbon fiber tube. Under the movement of the two positioning clamps 19, the center of the carbon fiber tube is automatically adjusted to the center line between the two cutting knives 72, so that both sides of the carbon fiber tube can be evenly stressed, so that a stable cutting state can be maintained during subsequent cutting; Next, two cylinders 92 are used to control the two upper clamping seats 93 to move downward, and cooperate with the corresponding lower clamping seats 94 to achieve longitudinal clamping and fixing of the carbon fiber tube, so as to ensure the stability of the carbon fiber tube during the cutting process; Next, the handle 20 is turned, and the handle 20 drives the bidirectional lead screw 5 to rotate. As the bidirectional lead screw 5 rotates, the two cutting mechanisms 7 move toward each other. When the distance between the two cutting mechanisms 7 reaches the required distance, the handle 20 can be stopped. When cutting the subsequent carbon fiber tubes for sample preparation, since the cutting distance between the two cutting mechanisms 7 is fixed in advance, it is no longer necessary to adjust the cutting distance in the future, thus avoiding the tediousness of re-measuring and positioning the cutting position of each carbon fiber tube in the traditional way; Then, the two cutting motors 73 are started to control the corresponding cutting blades 72 to rotate. Before cutting, the knob 14 can be turned. Under the transmission cooperation of the worm 12 and the worm wheel 13, the nut seat 83 will rotate synchronously to realize the up and down movement of the screw 84. During the movement of the screw 84, the sliding end of the sliding rheostat 82 will be driven to move, so as to realize the resistance value regulation of the sliding rheostat 82 connected to the cutting motor 73 circuit, and then realize the power regulation of the cutting motor 73, and control the speed of the cutting blade 72 as needed. With the cooperation of the pointer 16 and the power scale plate 17, it is convenient for the staff to accurately control the power regulation. After the cutting knife 72 rotates, the two hydraulic cylinders 3 are used to control the support frame 4 to move downward, and then the support frame 4 will drive the two cutting mechanisms 7 to move downward to cut the carbon fiber tube. During the cutting process, the vacuum cleaner 104 is started. With the cooperation of the dust suction pipe 15, the dust suction hood 103 and the dust suction port 102, the dust generated during the cutting process can be sucked and collected to prevent the dust from arbitrarily polluting the surrounding space.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sample preparation device for carbon fiber tensile strength, comprising a sample preparation table (1), characterized in that: The sample preparation table (1) is fixedly provided with a fixing frame (2), and two hydraulic cylinders (3) are fixedly provided on the fixing frame (2), the output ends of the two hydraulic cylinders (3) are fixedly connected to a support frame (4), a bidirectional lead screw (5) is rotatably provided on the support frame (4), and two symmetrically arranged threaded blocks (6) are threadedly connected on the bidirectional lead screw (5), a limit rod (22) is fixedly provided on the support frame (4), and the two threaded blocks (6) are evenly slidably connected to the limit rod (22), a cutting mechanism (7) is fixedly provided on the two threaded blocks (6), a power regulating mechanism (8) matched with the two cutting mechanisms (7) is fixedly provided on one side of the fixing frame (2), two supporting seats (21) are fixedly provided on the sample preparation table (1), and a clamping mechanism (9) is provided on the supporting seat (21), and a dust collecting mechanism (10) is provided on the sample preparation table (1).

2. A sample preparation device for carbon fiber tensile strength according to claim 1, characterized in that: The cutting mechanism (7) comprises a cutting frame (71), a cutting knife (72) and a cutting motor (73); the cutting frame (71) is fixedly connected to the corresponding threaded block (6); the cutting motor (73) is fixedly arranged on the cutting frame (71); the cutting knife (72) is rotatably arranged on the cutting frame (71); and one end of a transmission shaft of the cutting knife (72) is transmission-connected to the cutting motor (73).

3. A sample preparation device for carbon fiber tensile strength according to claim 2, characterized in that: The power regulating mechanism (8) comprises a regulating box (81), a sliding rheostat (82), a nut seat (83) and a screw (84); the regulating box (81) is fixedly arranged on one side of a fixing frame (2), and the sliding rheostat (82) is fixedly arranged in the regulating box (81); the nut seat (83) is rotatably arranged on the regulating box (81), and the screw (84) is threadedly connected to the nut seat (83); the lower end of the screw (84) is fixedly connected to the sliding end of the sliding rheostat (82) through an insulating block (11); and the sliding rheostat (82) is electrically connected to two cutting motors (73).

4. A sample preparation device for carbon fiber tensile strength according to claim 3, characterized in that: A worm (12) is rotatably arranged in the regulating box (81), and one end of the worm (12) passes through the regulating box (81) and is fixedly connected to a knob (14); a worm wheel (13) is fixedly sleeved on the lower side of the nut seat (83), and the worm wheel (13) is meshed with the worm (12); the unfolded helix angle of the worm (12) is smaller than the friction angle between the worm (12) and the worm wheel (13).

5. The sample preparation device for carbon fiber tensile strength according to claim 1, characterized in that: The clamping mechanism (9) comprises a clamping frame (91), a cylinder (92), an upper clamping seat (93) and a lower clamping seat (94); the clamping frame (91) and the lower clamping seat (94) are both fixedly arranged on the corresponding support seat (21); the cylinder (92) is fixedly arranged on the clamping frame (91), and the output end of the cylinder (92) is fixedly connected to the upper clamping seat (93); the upper clamping seat (93) and the lower clamping seat (94) are arranged opposite to each other, and the upper clamping seat (93) and the lower clamping seat (94) are both arranged in an arc shape.

6. A sample preparation device for carbon fiber tensile strength according to claim 1, characterized in that: The dust suction mechanism (10) comprises a dust suction chamber (101), a dust suction port (102), a dust suction hood (103) and a dust collector (104); the dust suction chamber (101) and the dust suction port (102) are both provided on the sample preparation platform (1), and the dust suction port (102) is communicated with the dust suction chamber (101); the dust suction hood (103) is fixedly arranged in the dust suction chamber (101), and the dust suction hood (103) is arranged at the dust suction port (102); the dust collector (104) is fixedly arranged on one side of the sample preparation platform (1), and an input end of the dust collector (104) is communicated with the dust suction hood (103) via a dust suction pipe (15).

7. A sample preparation device for carbon fiber tensile strength according to claim 3, characterized in that: A pointer (16) is fixedly disposed on the upper end of the screw rod (84), and a power scale plate (17) matching the pointer (16) is fixedly disposed on one side of the fixing frame (2).

8. The sample preparation device for carbon fiber tensile strength according to claim 1, characterized in that: Electric cylinders (18) are fixedly provided on both sides of the fixing frame (2), and positioning clamps (19) are fixedly provided on the output ends of the two electric cylinders (18), and the center between the two positioning clamps (19) and the center between the two cutting knives (72) are on a center line.

9. A sample preparation device for carbon fiber tensile strength according to claim 1, characterized in that: One end of the bidirectional lead screw (5) passes through the support frame (4) and is fixedly connected to a turning handle (20), and the thread lead angle of the bidirectional lead screw (5) is smaller than the equivalent friction angle.

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