Yarn pre-tightening force loading and clamping device based on light-gas gun impact system

Abstract

The invention provides a yarn pre-tightening force loading and clamping device based on a light-gas gun impact system. A yarn pretightening force loading and clamping device based on a light-gas gun impact system relates to the technical field of pretightening force and is composed of an aluminum alloy frame, two Z-axis displacement platforms, two force sensors and two yarn clamps, and the two Z-axis displacement platforms are fixed to the upper side and the lower side of the aluminum alloy frame respectively. The two force sensors are fixedly installed on the two Z-axis displacement platforms respectively, the two yarn clamps are fixedly installed on the two force sensors respectively, and the yarn clamps are pulled by adjusting the heights of the Z-axis displacement platforms. The yarn pre-tightening force loading and clamping device based on the light-gas gun impact system has the advantages that operation is easy, a yarn sample piece is prevented from slipping in the pre-tightening force loading process, and the accuracy of an experimental result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pre-tightening force, and particularly to a yarn pre-tightening force loading and clamping device based on a light gas gun impact system. Background Art

[0002] High-performance fibers have extremely high specific strength and specific modulus, and are widely used in fields such as individual protection equipment, tank armor, and military armed helicopter protection armor. However, in actual applications, due to factors such as the self-weight of the material and structural deformation, the yarn materials in the structure are usually in a pre-tensioned state. To clarify this phenomenon, a transverse impact test on pre-tensioned yarns is carried out to explore the influence of the pre-tightening force on the deformation process and damage mode of the yarn material after being impacted.

[0003] In the impact experiment on pre-tensioned yarns, since the device needs to apply a pre-tightening force to the yarn, ordinary clamping devices may cause slippage at the yarn clamping position, resulting in a change in the pre-tightening force of the yarn during the experiment, thereby affecting the accuracy of the experimental results.

[0004] Therefore, it is necessary to provide a yarn pre-tightening force loading and clamping device based on a light gas gun impact system to solve the above technical problems.

[0005] Practical Invention Content

[0006] The technical problem solved by the present invention is to provide a yarn pre-tightening force loading and clamping device based on a light gas gun impact system that is easy to use, simple to operate, prevents slippage of the yarn sample during the pre-tightening force loading process, and improves the accuracy of the experimental results.

[0007] To solve the above technical problems, the yarn pre-tightening force loading and clamping device based on a light gas gun impact system provided by the present invention is composed of an aluminum alloy frame, two Z-axis displacement platforms, two force sensors, and two yarn clamps. The two Z-axis displacement platforms are respectively fixed on the upper and lower sides of the aluminum alloy frame. The two force sensors are respectively fixedly installed on the two Z-axis displacement platforms. The two yarn clamps are respectively fixedly installed on the two force sensors. By adjusting the height of the Z-axis displacement platform to pull the yarn clamp, the pre-tightening force loading on the yarn sample is realized. The pulling force between the yarn clamp and the Z-axis displacement platform is measured by the force sensor and uploaded to the computer software through a data acquisition device, and the magnitude of the pre-tightening force applied by the device is recorded and displayed in real time.

[0008] Preferably, the yarn clamp includes a bolt base, a yarn limiting ring, an external hexagonal yarn fixing bolt, and a bolt fixing nut adapted to the external hexagonal yarn fixing bolt. The bolt base is installed on the Z-axis displacement platform or the force sensor. The yarn is wound and fixed at the root of the external hexagonal yarn fixing bolt. The yarn limiting ring is sleeved on the external hexagonal yarn fixing bolt.

[0009] Preferably, a clamping groove for limiting the outer hexagon of the external hexagon yarn fixing bolt is formed on the bolt base.

[0010] Preferably, the force sensor is a bridge sensor.

[0011] Preferably, the aluminum alloy frame is composed of a plurality of aluminum profiles and connecting angle codes.

[0012] Preferably, the Z-axis displacement platform is installed on the upper and lower sides of the aluminum alloy frame through fixing bolts, the force sensor is installed on the Z-axis displacement platform through studs, and the yarn clamp is installed on the force sensor through studs.

[0013] Preferably, a distance of 1 mm is left between the yarn limiting ring and the bolt outer hexagon on the external hexagon yarn fixing bolt, so that the yarn extends out from the gap between the limiting ring and the bolt outer hexagon.

[0014] Compared with the related technology, the yarn pre-tightening force loading and clamping device based on the light gas gun impact system provided by the present invention has the following beneficial effects:

[0015] The present invention provides a yarn pre-tightening force loading and clamping device based on a light gas gun impact system. By changing the height of the Z-axis displacement platform, the pre-tensioning of the yarn sample is realized, and a relatively accurate pre-strain loading of the yarn sample is achieved by using the vernier caliper attached to the displacement platform; the pre-tightening force on the yarn is measured and output by a bridge circuit sensor, realizing the accurate loading and measurement of the yarn pre-tightening force; by designing the clamping method of the yarn by the device, the yarn is tightly connected to the clamp, avoiding the unloading of the pre-tightening force caused by the yarn slipping, and realizing the impact test of the yarn with a fixed pre-tightening force by means of the light gas gun impact system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall assembly schematic diagram of the clamping device;

[0017] Figure 2 is the schematic diagram of the aluminum alloy frame;

[0018] Figure 3 is the schematic diagram of the Z-axis displacement platform;

[0019] Figure 4 is the schematic diagram of the fixing bolt;

[0020] Figure 5 is the schematic diagram of the force sensor 3;

[0021] Figure 6 is the schematic diagram of the connecting stud;

[0022] Figure 7 is the schematic diagram of the bolt base 4;

[0023] Figure 8 It is a schematic diagram of the external hexagon yarn fixing bolt 5;

[0024] Figure 9 It is a schematic diagram of the yarn limiting ring;

[0025] Figure 10 It is a schematic diagram of the fixing nut;

[0026] Figure 11 It is a schematic diagram of the yarn sample.

[0027] Reference numerals in the figure: 1, aluminum alloy frame; 2, Z-axis displacement platform; 3, force sensor; 4, bolt base; 5, external hexagon yarn fixing bolt. Specific implementation manner

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] Please refer to Figures 1-11 , in the embodiment of the present invention, the yarn pre-tensioning clamping device based on the light gas gun impact system includes: consisting of an aluminum alloy frame 1, two Z-axis displacement platforms 2, two force sensors 3 and two yarn clamps. The aluminum alloy frame 1 is composed of several aluminum profiles and connecting angle codes. As a frame, it is connected to the fixed bracket in the sample target chamber of the light gas gun impact system. The two Z-axis displacement platforms 2 are respectively fixed on the upper and lower sides of the aluminum alloy frame 1 through fixing bolts. The two force sensors 3 are respectively fixed on the two Z-axis displacement platforms 2 through studs. The two yarn clamps are respectively fixed on the two force sensors 3 through studs. By changing the height of the Z-axis displacement platform 2, the movement of the yarn clamp is driven, thereby changing the length of the yarn sample and applying a pre-tension to the yarn. The displacement distance of the platform is read by the vernier caliper of the displacement platform to achieve precise loading of the yarn sample. The tension between the yarn clamp and the Z-axis displacement platform 2 is measured by the force sensor 3 and uploaded to the computer software through the data acquisition device, and the magnitude of the pre-tension applied by the device is recorded and displayed in real time. A set of yarn pre-tensioning clamping devices for the lateral impact test of the light gas gun is built through the Z-axis displacement platform 2, the force sensor 3 and the yarn clamp. Before the impact test, a pre-tension is applied to the yarn. A 30-mm-long piece of paper tape is pasted at each end of the yarn sample. The yarn and the paper tape are wound together around the root of the external hexagon yarn fixing bolt 5. The yarn is tightly wound around the external hexagon yarn fixing bolt 5 through the mutual extrusion between the yarn-paper tape-bolt thread, increasing the friction between the yarn sample and the external hexagon yarn fixing bolt 5 and avoiding slippage at the yarn clamping position during pre-tension loading.

[0030] The yarn clamp includes a bolt base 4, a yarn limiting ring, an external hexagonal yarn fixing bolt 5 and a bolt fixing nut adapted to the external hexagonal yarn fixing bolt 5. The bolt base 4 is installed on the Z-axis displacement platform 2 or the force sensor 3. The yarn is wound and fixed at the root of the external hexagonal yarn fixing bolt 5, and the yarn limiting ring is sleeved on the external hexagonal yarn fixing bolt 5.

[0031] In order to limit the external hexagonal yarn fixing bolt 5, prevent the external hexagonal yarn fixing bolt 5 from shaking, and avoid the unloading of the pre-tightening force caused by the rotation of the external hexagonal yarn fixing bolt 5, a card slot for limiting the external hexagon on the external hexagonal yarn fixing bolt 5 is provided on the bolt base 4.

[0032] In order to reduce the measurement error, the force sensor 3 is a bridge sensor. Since the bridge sensor can continuously output a stable value when subjected to a quasi-static tensile force, it can avoid the measurement error of the pre-tightening force caused by drift.

[0033] In order to ensure the consistency of the sample position during each experimental sample installation and improve the experimental efficiency, a distance of 1 mm is left between the yarn limiting ring and the external hexagon of the external hexagonal yarn fixing bolt 5, so that the yarn extends from the gap between the limiting ring and the external hexagon of the bolt.

[0034] The working principle of the yarn pre-tightening force loading and clamping device based on the light gas gun impact system provided by the present invention is as follows: Connect and fix the aluminum alloy frame 1 to the sample target chamber, install the Z-axis displacement platform 2, the force sensor 3 and the bolt base 4 in sequence, connect the force sensor 3 to the data acquisition system, stick about 30 mm long paper tape on both ends of the yarn sample, and wind it together with the paper tape around the external hexagonal yarn fixing bolt 5 of the yarn. After the yarn winding is completed, put the yarn limiting ring on the external hexagonal yarn fixing bolt 5 to limit the yarn position at the root of the external hexagonal yarn fixing bolt 5. Insert the external hexagonal yarn fixing bolt 5 and the yarn assembly into the circular groove of the bolt base 4, rotate the external hexagonal yarn fixing bolt 5 to adjust the yarn length, install the hexagonal nut of the external hexagonal yarn fixing bolt 5 into the hexagonal card slot of the bolt base 4 and tighten the fixing nut, calibrate the yarn sample position, change the height of the Z-axis displacement platform 2 to load the pre-tightening force, install the bullet and inflate the light gas gun, and conduct a dynamic impact experiment on the sample.

[0035] Compared with the related technology, the yarn pre-tightening force loading and clamping device based on the light gas gun impact system provided by the present invention has the following beneficial effects:

[0036] The present invention provides a yarn pre-tension loading and clamping device based on a light gas gun impact system. By changing the height of the Z-axis displacement platform 2, pre-tensioning of the yarn sample is achieved, and a relatively precise pre-strain loading of the yarn sample is realized by using the vernier caliper attached to the displacement platform; the pre-tension force on the yarn is measured and output by a bridge circuit sensor to achieve precise loading and measurement of the yarn pre-tension force; by designing the clamping method of the yarn, a precise connection between the yarn and the fixture is achieved, avoiding the unloading of the pre-tension force caused by yarn slippage, and an impact test on the yarn with a fixed pre-tension force loading is realized by means of a light gas gun impact system.

[0037] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A yarn pre-tightening force loading and clamping device based on a light gas gun impact system, characterized in that: It consists of an aluminum alloy frame, two Z-axis displacement platforms, two force sensors and two yarn clamps. The two Z-axis displacement platforms are respectively fixed on the upper and lower sides of the aluminum alloy frame. The two force sensors are respectively fixedly installed on the two Z-axis displacement platforms. The two yarn clamps are respectively fixedly installed on the two force sensors. By adjusting the height of the Z-axis displacement platform to pull the yarn clamp, the pre-tightening force loading of the yarn sample is realized. The tension between the yarn clamp and the Z-axis displacement platform is measured by the force sensor and uploaded to the computer software through the data acquisition device, and the magnitude of the pre-tightening force applied by the device is recorded and displayed in real time.

2. The yarn pre-tension loading and clamping device based on the light gas gun impact system according to claim 1, wherein The yarn clamp includes a bolt base, a yarn limiting ring, an external hexagon yarn fixing bolt and a bolt fixing nut adapted to the external hexagon yarn fixing bolt. The bolt base is installed on the Z-axis displacement platform or the force sensor. The yarn is wound and fixed at the root of the external hexagon yarn fixing bolt, and the yarn limiting ring is sleeved on the external hexagon yarn fixing bolt.

3. The yarn pre-tension loading and clamping device based on the light gas gun impact system according to claim 2, characterized in that A clamping groove for limiting the external hexagon on the external hexagon yarn fixing bolt is formed on the bolt base.

4. The yarn pre-tension loading and clamping device based on a light gas gun impact system according to claim 3, wherein, The force sensor is a bridge sensor.

5. The yarn pre-tension loading and clamping device based on the light gas gun impact system according to claim 4, characterized in that, The aluminum alloy frame is composed of several aluminum profiles and connecting angle codes.

6. The yarn pre-tension loading and clamping device based on a light gas gun impact system according to claim 5, characterized in that, The Z-axis displacement platform is installed on the upper and lower sides of the aluminum alloy frame through fixing bolts. The force sensor is installed on the Z-axis displacement platform through studs. The yarn clamp is installed on the force sensor through studs.

7. The yarn pre-tension loading and clamping device based on the light gas gun impact system according to claim 6, characterized in that A distance of 1 mm is left between the yarn limiting ring and the external hexagon of the external hexagon yarn fixing bolt, so that the yarn extends out from the gap between the limiting ring and the external hexagon of the bolt.

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