A stretching device for carbon fiber composite

Abstract

The utility model belongs to the tensile test equipment technical field, concretely relates to a kind of tensile device for carbon fiber composite, including rack, lower clamping component being located on rack, upper clamping component being slidably arranged on rack;Further include the driving assembly being located on rack, the driving assembly includes a group of lead screw, the lead screw is connected with upper clamping component for driving its up and down movement, the bottom of the lead screw is equipped with displacement sensor;Spring in compression state is connected on the displacement sensor, another end of the spring is connected with lead screw.Spring connects lead screw and displacement sensor as connecting piece, when carbon fiber composite breaks, spring can provide good buffer to avoid damaging displacement sensor, while spring can limit or compensate the axial displacement of the output shaft of driving lead screw, and the displacement measured is more accurate.

Description

Technical Field

[0001] This utility model belongs to the technical field of tensile testing equipment, and specifically relates to a tensile device for carbon fiber composites. Background Technology

[0002] Carbon fiber composites are inorganic high-performance fibers with a carbon content of over 90%, which are transformed from organic fibers through a series of heat treatments. They are a new material with excellent mechanical properties, possessing the inherent characteristics of carbon materials while also having the softness and processability of textile fibers. They are a new generation of reinforcing fibers. In order to evaluate and determine the mechanical properties of the material in practical applications and ensure its reliability and safety in actual use, it is necessary to conduct tensile property tests on carbon fiber composites.

[0003] Currently, most tensile testing machines on the market use servo motors to drive a lead screw, which then performs the tensile testing on carbon fiber composites. However, in practical use, this type of tensile testing device has the following drawbacks: 1. In tensile testing of carbon fiber composites (or other materials), displacement measurement is a core step. Its function is not only to record "how long the specimen is stretched," but also directly serves three core objectives: mechanical property calculation, test process control, and test validity verification, ultimately ensuring the accuracy, scientific validity, and traceability of the test data. However, servo motors are generally paired with reducers to drive the lead screw, but the reducer's output shaft has a permissible axial movement distance. This leads to a difference between the distance measured by the displacement sensor and the actual displacement distance, resulting in inaccurate test results. 2. During tensile testing, the loading and fracture of the specimen will generate an impact. This impact is transmitted to the sensor through the lead screw, which can easily damage the sensor.

[0004] Therefore, the above-mentioned problems have become technical issues that urgently need to be solved. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above deficiencies, this utility model provides a stretching device for carbon fiber composites, aiming to solve the above technical problems.

[0006] Technical solution: In order to achieve the above objectives, this utility model provides a stretching device for carbon fiber composites, including a frame, a lower clamping assembly disposed on the frame, and an upper clamping assembly slidably disposed on the frame. It also includes a drive assembly mounted on the frame, the drive assembly including a set of lead screws, the lead screws being connected to the upper clamping assembly for driving its up and down movement, and a displacement sensor being provided at the bottom of the lead screws; A compressed spring is connected to the displacement sensor, and the other end of the spring is connected to a lead screw. The spring acts as a connector between the lead screw and the displacement sensor, providing good cushioning to prevent damage to the displacement sensor should the carbon fiber composite material break.

[0007] Furthermore, the lead screw is rotatably mounted on the frame, and the drive assembly also includes a servo motor and a reducer. The output end of the servo motor is connected to the input end of the reducer, and one end of the reducer's output shaft is connected to the lead screw via a coupling, while the other end is connected to a spring. The compressed spring prevents the reducer's output shaft from axially shifting.

[0008] Furthermore, the lower clamping assembly includes a tension sensor mounted on the frame, with a lower clamp mounting plate mounted on the tension sensor, and a lower clamp provided on the lower mounting plate. The tension sensor collects the tension value of the sample in real time.

[0009] Furthermore, the upper clamping assembly includes an upper chuck mounting plate, with an upper chuck at its bottom. Both ends of the upper chuck mounting plate are connected to the lead screw via threaded sleeves. The upper chuck mounting plate also features a bellows-like protective cover to isolate the lead screw from the outside. When the servo motor drives the lead screw to rotate, the threaded sleeves, under the action of the helical grooves, move axially linearly along the lead screw, precisely converting the rotational motion of the servo motor into the linear motion of the upper chuck mounting plate.

[0010] Furthermore, the rack is equipped with a control panel, which includes a display screen, an emergency stop switch, and adjustment buttons.

[0011] Furthermore, the frame includes a set of columns, the lead screw is disposed inside the columns, and the columns are provided with protective components to shield the debris generated when the carbon fiber composite breaks.

[0012] Furthermore, the protective assembly includes a set of mounting rods mounted on the column, and a protective plate slidably mounted on the mounting rods; The upper part of the protective plate is fitted onto the mounting rod, and the lower part of the protective plate is connected to the mounting rod via a latch. The latch is connected to an adjusting bolt located on the mounting rod, and the adjusting bolt can adjust the tightness of the latch. The height of the protective plate can be adjusted arbitrarily on the mounting rod.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects: 1. This utility model provides a tensioning device for carbon fiber composites. Its structure is simple and rationally designed. It eliminates the rigid connection between the lead screw and the displacement sensor, instead installing a compressed spring between them. The spring provides an upward force to the output shaft of the reducer, preventing axial movement that could cause a discrepancy between the displacement measured by the sensor and the actual displacement. Even if axial displacement occurs during movement, it can be compensated and corrected by the spring force. The spring also provides radial buffering, preventing the instantaneous torque transmission to the displacement sensor when the carbon fiber composite breaks, thus protecting the sensor.

[0014] 2. In addition, the present invention is equipped with an adjustable protective plate on the frame, which can effectively shield the debris generated when the carbon fiber composite breaks, thereby further improving safety. Attached Figure Description

[0015] Figure 1 This is a perspective view of a stretching device for carbon fiber composites according to the present invention. Figure 2 This is a top view of a stretching device for carbon fiber composites according to the present invention. Figure 3 for Figure 2 Sectional view along the AA direction; Figure 4 for Figure 2 Sectional view along the BB direction; Figure 5 for Figure 2 Cross-sectional view along the CC direction; Figure 6 for Figure 5 Enlarged diagram of point A in the middle.

[0016] In the diagram: 1-Rack, 11-Control panel, 12-Column; 2-Lower clamping assembly, 21-Force sensor, 22-Lower chuck mounting plate, 23-Lower chuck; 3-Upper clamping assembly, 31-Upper chuck mounting plate, 32-Upper chuck; 41-Lead screw, 42-Servo motor, 43-Reducer; 5-Displacement sensor; 6-Spring; 7-Protective components, 71-Mounting rod, 72-Protective plate. Detailed Implementation

[0017] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0018] Example 1 like Figures 1-6 As shown: A stretching device for carbon fiber composites includes a frame 1, a lower clamping assembly 2 disposed on the frame 1, and an upper clamping assembly 3 slidably disposed on the frame 1. It also includes a drive assembly mounted on the frame 1. The drive assembly includes a set of lead screws 41. The lead screws 41 are connected to the upper clamping assembly 3 for driving it to move up and down. A displacement sensor 5 is provided at the bottom of the lead screws 41. The displacement sensor 5 is connected to a spring 6 in a compressed state, and the other end of the spring 6 is connected to the lead screw 41.

[0019] With the above scheme, when the carbon fiber composite is subjected to tensile testing, its two ends are clamped on the lower clamping component 2 and the upper clamping component 3 respectively. Then, the drive component is activated to move the upper clamping component 3 upward, thereby applying a gradually increasing tensile force to the carbon fiber composite. The displacement sensor 5 is a rotary angular displacement sensor, which can measure the displacement of the upper clamping component 3. The spring 6 can provide radial buffering to prevent the torque from being instantly transmitted to the displacement sensor 5 when the carbon fiber composite breaks, thereby achieving the purpose of protecting the sensor.

[0020] The lead screw 41 is rotatably mounted on the frame 1. The drive assembly includes a servo motor 42 and a reducer 43. The output end of the servo motor 42 is connected to the input end of the reducer 43. One end of the output shaft of the reducer 43 is connected to the lead screw 41 via a coupling, and the other end is connected to the spring 6. The servo motor 42 has a built-in encoder, which can collect the actual speed and angle data of the motor in real time and transmit it back to the driver. After comparing it with the target value, the deviation is corrected (such as automatically reducing the speed when it is too fast) to avoid overshoot or uneven loading. The carbon fiber composite stretching requires slow and stable loading. The servo motor 42 can output stable torque at low speed to avoid uneven force on the sample due to power fluctuations. The spring 6 provides an upward force to the output shaft of the reducer 43 to prevent axial movement that would cause a difference between the displacement measured by the displacement sensor and the actual displacement. Even if the output shaft undergoes axial displacement during movement, it can be compensated and corrected by the elastic force of the spring 6.

[0021] The lower clamping assembly 2 includes a tension sensor 21 mounted on the frame 1. A lower clamp mounting plate 22 is mounted on the tension sensor 21, and a lower clamp 23 is mounted on the lower mounting plate 22. In this embodiment, the tension sensor 21 is an S-shaped tension sensor, which collects tension data in real time during the test.

[0022] The upper clamping assembly 3 includes an upper chuck mounting plate 31, with an upper chuck 32 at its bottom. Both ends of the upper chuck mounting plate 31 are connected to the lead screw 41 via threaded sleeves. The upper chuck mounting plate 31 also features a bellows-shaped protective cover to isolate the lead screw 41 from the outside environment. The bellows-shaped protective cover effectively prevents external dust and debris generated during carbon fiber composite breakage from entering the lead screw 41, ensuring smooth transmission of the lead screw 41.

[0023] The frame 1 is equipped with a control panel 11, which includes a display screen, an emergency stop switch, and adjustment buttons. Users can use the control panel to set parameters, start and stop the equipment, and perform other operations.

[0024] Example 2 Based on Embodiment 1, the frame 1 in this embodiment includes a set of columns 12, the lead screw 41 is disposed inside the column 12, and the column 12 is provided with a protective component 7 to shield the debris generated when the carbon fiber composite breaks.

[0025] The protective component 7 includes a set of mounting rods 71 ​​mounted on the column 12 and a protective plate 72 slidably mounted on the mounting rods 71. The upper part of the protective plate 72 is fitted onto the mounting rod 71, and the lower part of the protective plate 71 is connected to the mounting rod 71 via a latch. The latch is connected to an adjusting bolt on the mounting rod 71, and the adjusting bolt can adjust the tightness of the latch. The position of the protective plate 72 on the mounting rod 71 can be adjusted by loosening the latch with the adjusting bolt, and the latch can be tightened by tightening the adjusting bolt after adjustment. To allow observation of the carbon fiber composite material's condition during testing, the protective plate 72 can be made of transparent acrylic sheet.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A stretching device for carbon fiber composites, characterized in that, Includes a frame (1), a lower clamping assembly (2) disposed on the frame (1), and an upper clamping assembly (3) slidably disposed on the frame (1). It also includes a drive assembly mounted on the frame (1), the drive assembly including a set of lead screws (41), the lead screws (41) being connected to the upper clamping assembly (3) for driving it to move up and down, and a displacement sensor (5) being provided at the bottom of the lead screws (41). The displacement sensor (5) is connected to a spring (6) in a compressed state, and the other end of the spring (6) is connected to the lead screw (41).

2. The stretching device for carbon fiber composites according to claim 1, characterized in that, The lead screw (41) is rotatably mounted on the frame (1). The drive assembly also includes a servo motor (42) and a reducer (43). The output end of the servo motor (42) is connected to the input end of the reducer (43). One end of the output shaft of the reducer (43) is connected to the lead screw (41) through a coupling, and the other end is connected to the spring (6).

3. The stretching device for carbon fiber composites according to claim 1, characterized in that, The lower clamping assembly (2) includes a tension sensor (21) mounted on the frame (1), and a lower clamp mounting plate (22) is provided on the upper part of the tension sensor (21), and a lower clamp (23) is provided on the lower mounting plate (22).

4. The stretching device for carbon fiber composites according to claim 1, characterized in that, The upper clamping assembly (3) includes an upper clamp mounting plate (31), with an upper clamp (32) at the bottom of the upper clamp mounting plate (31). Both ends of the upper clamp mounting plate (31) are connected to the lead screw (41) via threaded sleeves. The upper clamp mounting plate (31) is also provided with a bellows protective cover to separate the lead screw (41) from the outside.

5. The stretching device for carbon fiber composites according to claim 1, characterized in that, The frame (1) is equipped with a control panel (11), which includes a display screen, an emergency stop switch, and adjustment buttons.

6. The stretching device for carbon fiber composites according to claim 1, characterized in that, The frame (1) includes a set of columns (12), the lead screw (41) is located inside the columns (12), and the columns (12) are provided with protective components (7) to shield the debris generated when the carbon fiber composite breaks.

7. A stretching device for carbon fiber composites according to claim 6, characterized in that, The protective component (7) includes a set of mounting rods (71) on the column (12) and a protective plate (72) slidably mounted on the mounting rods (71). The upper part of the protective plate (72) is sleeved on the mounting rod (71), and the lower part of the protective plate (71) is connected to the mounting rod (71) through a buckle. The buckle is connected to an adjusting bolt provided on the mounting rod (71), and the adjusting bolt can adjust the tightness of the buckle.

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