A high-temperature and high-throughput testing device for fiber monofilaments

Abstract

The present invention discloses a high-temperature, high-throughput testing device for a fiber monofilament, comprising a load-sharing plate and several measuring units; the measuring unit comprises a fixing assembly, a driving and loading assembly, and a heating assembly; the fixing assembly comprises a lower clamp, a lower connecting rod, and a force sensor; the lower clamp is fixed to the upper end of the lower connecting rod, and the lower end of the lower connecting rod is fixed to the load-sharing plate through the force sensor; the driving and loading assembly comprises an upper clamp and an upper connecting rod; the upper clamp is fixed to the lower end of the upper connecting rod, and the upper connecting rod can move up and down, driving the upper clamp to move up and down accordingly; the heating assembly comprises two sets of metal plates and a conductive metal belt; the two metal plates are respectively clamped on the upper clamp and the lower clamp; the two conductive metal belts are respectively bonded to the metal plates by high-temperature resistant conductive adhesive; and the two ends of the test piece are respectively bonded to the two metal plates by high-temperature resistant conductive adhesive. The device of the present invention has a simple structure and is easy to operate, and can significantly improve the testing efficiency of the high-temperature mechanical properties of fiber monofilaments.

Description

Technical Field

[0001] The invention belongs to the field of detection devices and relates to a fiber monofilament testing device, in particular to a fiber monofilament high-temperature and high-throughput testing device. Background Art

[0002] Fibers are widely used in aerospace and other fields due to their excellent performance. Their mechanical properties are of particular concern to relevant practitioners, and the requirements for methods and equipment for studying the mechanical properties of fibers are constantly increasing.

[0003] Existing high-temperature testing machines have the following drawbacks: First, existing high-temperature tests often require the installation of a high-temperature furnace with thick walls, requiring a very long high-temperature extension rod (Xiong Junjiang, Man Ziyu, and Du Yisen. A High-Temperature Creep Fatigue Testing System). Long extension rods deform significantly at high temperatures, making it easy for the blade to slip on the specimen surface, resulting in low modulus test success rates and large data dispersion. Second, for each hot-clamp test, the high-temperature furnace must first be raised to the target temperature, then held at that temperature before testing can begin. After the test, the temperature must be lowered before the specimen can be replaced, resulting in a relatively long test cycle (Ju Xiaorong. Research on a High-Temperature Creep Micromechanical Model of CMCs Considering Fiber Creep [D]. Nanjing University of Aeronautics and Astronautics, 2019. DOI: 10.27239 / d.cnki.gnhhu.2019.000239.). Existing testing machines test one piece at a time, resulting in low test efficiency and poor thermal energy utilization during heating.

[0004] Therefore, it is necessary to develop a high-temperature, high-throughput testing device that can efficiently and accurately test multiple test pieces in a high-temperature environment while reducing energy consumption and costs. Summary of the Invention

[0005] The present invention provides a fiber monofilament high-temperature and high-throughput testing device to overcome the defects of the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which has the following characteristics: it includes a load-sharing plate and several measuring units; the measuring units include a fixing assembly, a driving and loading assembly and a heating assembly; the fixing assembly includes a lower clamp, a lower connecting rod and a force sensor; the lower clamp is fixed to the upper end of the lower connecting rod, and the lower end of the lower connecting rod is fixed to the load-sharing plate through the force sensor; the driving and loading assembly includes an upper clamp and an upper connecting rod; the upper clamp is located above the lower clamp; the upper clamp is fixed to the lower end of the upper connecting rod, and the upper connecting rod can move up and down, driving the upper clamp to move up and down accordingly; the heating assembly includes two groups of metal plates and conductive metal strips; the two metal plates are respectively clamped on the upper clamp and the lower clamp; the two conductive metal strips are respectively bonded to the metal plates by high-temperature resistant conductive glue; the two ends of the test piece are respectively bonded to the two metal plates by high-temperature resistant conductive glue; the heating assembly also includes several power supplies and wires; the number of power supplies is equal to the number of measuring units and corresponds one to one, and each power supply is connected to the two conductive metal strips of the corresponding measuring unit through a wire.

[0007] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: it also includes a cooling unit; the cooling unit includes a water cooler and several water-cooling pipes; the upper clamp and the lower clamp of the measuring unit are both hollow structures; the outlet of the water cooler and the upper clamps of several measuring units are connected in series in sequence through the water-cooling pipe, the upper clamp of the last measuring unit is connected to the lower clamp of the same measuring unit through the water-cooling pipe, and the lower clamps of several measuring units and the inlet of the water cooler are connected in series in sequence through the water-cooling pipe to form a series circuit.

[0008] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: wherein, in each of the measuring units, a connected water-cooling pipe is provided between the upper clamp and the lower clamp, and a water-stop clamp is provided on the water-cooling pipe.

[0009] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: wherein, the measuring unit also includes a displacement monitor, which is fixed on the load-bearing plate to monitor the state of the test piece measured by the measuring unit.

[0010] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: wherein, the heating component also includes an infrared thermometer and a temperature controller; the infrared thermometer monitors the temperature of the test piece measured by the same measuring unit, and transmits the temperature data to the temperature controller, and the temperature controller controls the output of the power supply of the same measuring unit according to the temperature data.

[0011] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: asbestos gaskets are placed between the upper clamp and the metal plate and between the lower clamp and the metal plate.

[0012] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: it also includes a frame, which is located above each measuring unit; the driving loading assembly of each measuring unit also includes a screw and a rotating member; the rotating member is arranged in the frame, and the rotating member can rotate; the screw is vertically arranged above the upper connecting rod; the lower end of the screw is rotatably connected to the upper end of the upper connecting rod, and the screw can rotate relative to the upper connecting rod; the rotating member has a threaded hole, and the upper part of the screw is threadedly connected to the rotating member; when the rotating member rotates, the screw moves up and down with the rotation of the rotating member, and the upper connecting rod and the upper clamp move up and down accordingly.

[0013] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: wherein the rotating part is a rotating gear.

[0014] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: wherein, the driving loading assembly of each measuring unit also includes a motor and a driving gear; the motor is fixed on the frame, the driving gear is fixed on the output shaft of the motor, and the driving gear is engaged with the rotating gear; the motor drives the rotating gear to rotate through the driving gear.

[0015] Furthermore, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which may also have the following characteristics: wherein the wire is placed on a frame.

[0016] The beneficial effects of the present invention are:

[0017] 1. The device of the present invention can be used for mechanical property testing of small specimens.

[0018] 2. The device of the present invention is modified based on the original uniaxial fiber monofilament tensile testing machine. By setting up multiple measuring units, it can realize simultaneous testing of multiple test pieces and improve test efficiency.

[0019] 3. Each measuring unit in the device of the present invention has an independent load monitoring and compensation device, which accurately loads and compensates the load of each test piece through closed-loop control.

[0020] Fourth, the device of the present invention adopts electric current heating. For tiny test pieces, electric current heating is fast and efficient, and the temperature can be accurately controlled by a temperature controller.

[0021] 5. The cooling system of the device of the present invention adopts water cooling. Compared with other systems such as air cooling, water cooling has a smaller volume and adopts a hollow clamp structure, which can be cooled quickly. It is not limited by the high-temperature clamp material and can achieve high-temperature tensile performance testing within 1500°C.

[0022] 6. The device of the present invention has a simple structure and adopts electric current heating instead of a traditional high-temperature furnace. The device is more flexible to install, occupies a small volume, and has little impact on the driving and loading components. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a fiber monofilament high-temperature and high-throughput testing device;

[0024] Figure 2 It is a schematic diagram of the structure of the fixed components and the driving loading components in the measuring unit;

[0025] Figure 3 It is a schematic diagram of the structure of some heating components in the measuring unit. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the present invention provides a fiber monofilament high-temperature and high-throughput testing device, which includes a loading tray 1, six measuring units 2, a cooling unit 3 and a frame 4.

[0028] The measuring unit 2 includes a fixing component, a driving and loading component, and a heating component.

[0029] The fixing assembly includes a lower fixture 211, a lower connecting rod 212, and a force sensor 213. Lower fixture 211 is fixed to the upper end of lower connecting rod 212, and the lower end of lower connecting rod 212 is fixed to the load distribution plate 1 via force sensor 213. Force sensor 213 has a range of 5N and constantly monitors the force applied to the test piece.

[0030] like Figure 2 As shown, the drive loading assembly includes an upper fixture 221 and an upper connecting rod 222. Upper fixture 221 is located above lower fixture 211. Upper fixture 221 is fixed to the lower end of upper connecting rod 222. Upper connecting rod 222 can move up and down, thereby driving upper fixture 221 up and down. The up and down movement of upper fixture 221 applies force to the test piece, enabling tension and compression testing.

[0031] Specifically, the frame 4 is located above each measuring unit 2. The drive loading assembly of each measuring unit 2 also includes a screw rod 223, a rotating gear 224, a motor, and a driving gear. The rotating gear 224 is arranged in the frame 4 and can rotate. The motor is fixed to the frame 4, and the driving gear is fixedly sleeved on the output shaft of the motor, and the driving gear is engaged with the rotating gear 224. The motor drives the rotating gear 224 to rotate through the driving gear. The screw rod 223 is vertically arranged above the upper connecting rod 222. The lower end of the screw rod 223 is rotatably connected to the upper end of the upper connecting rod 222 via a bearing, and the screw rod 223 can rotate relative to the upper connecting rod 222. The rotating gear 224 has a threaded hole, and the upper part of the screw rod 223 is threadedly connected to the rotating gear 224. The motor drives the rotating gear 224 to rotate through the driving gear. The screw rod 223 moves up and down with the rotation of the rotating gear 224, and the upper connecting rod 222 and the upper clamp 221 move up and down accordingly.

[0032] In this embodiment, the rotating gear may also be other rotatable rotating parts.

[0033] like Figure 3 As shown, the heating assembly includes two sets of metal plates 231 and conductive metal strips 232. The two metal plates 231 are clamped by an upper clamp 221 and a lower clamp 211, respectively. The two conductive metal strips 232 are bonded to their respective metal plates 231 using high-temperature-resistant conductive adhesive. The high-temperature-resistant conductive adhesive is a conductive adhesive that can withstand the test heating temperature.

[0034] The two ends of the test piece A are respectively bonded to the two metal plates 231 through high-temperature resistant conductive adhesive.

[0035] The heating assembly also includes six power supplies 233 (only one is shown schematically in the figure) and a number of wires 234. The six power supplies 233 correspond one to one with the six measuring units 2, and each power supply 233 is connected to the two conductive metal strips 232 of the corresponding measuring unit 2 via a wire 234. This device adopts an electric current heating method. When the power supply 233 is turned on, the test piece acts as a resistor and heats itself by the electric current. Specifically, when conducting a high-temperature fiber monofilament tensile test, the power supply 233 outputs a voltage, and a current loop is formed through the test piece. Since the resistivity of the test piece is much greater than the conductive metal strip 232, the voltage output by the power supply 233 is almost distributed at both ends of the test piece, so the test piece can be heated quickly. Moreover, since the test piece itself is too small, its resistance is uniform, so the current is equal at each location, which ensures the uniformity of the heating of the test piece.

[0036] Preferably, the wire 234 is placed on the rack 4 to avoid the influence of the wire 234's own gravity on the test.

[0037] The heating assembly also includes an infrared thermometer and a temperature controller. The infrared thermometer monitors the temperature of the test piece measured by the same measuring unit 2 and transmits the temperature data to the temperature controller. The temperature controller controls the output of the power supply 233 of the same measuring unit 2 based on the temperature data, thereby controlling the heating temperature of the test piece.

[0038] Preferably, asbestos gaskets 235 are placed between the upper clamp 221 and the metal plate 231 and between the lower clamp 211 and the metal plate 231 . The asbestos gaskets 235 can provide heat insulation and electrical insulation.

[0039] The measuring unit 2 further includes a displacement monitor, which is fixed on the load sharing plate 1 and monitors the state of the test piece measured by the measuring unit 2 .

[0040] In this embodiment, the number of measuring units 2 may also be other numbers.

[0041] The cooling unit 3 includes a water cooler 31 and several water-cooling pipes 32. The upper fixture 221 and lower fixture 211 of each measuring unit 2 are both hollow structures. The outlet of the water cooler 31 and the upper fixtures 221 of the six measuring units 2 are connected in series via the water-cooling pipes 32. The upper fixture 221 of the last measuring unit 2 is connected to the lower fixture 211 of the same measuring unit 2 via the water-cooling pipes 32. The lower fixtures 211 of the six measuring units 2 and the inlet of the water cooler 31 are connected in series via the water-cooling pipes 32, forming a series circuit. The water-cooling pipes 32 carry water from the water cooler 31 through each upper fixture 221 and lower fixture 211, and finally return to the water cooler 31, forming a closed loop. This means that the circulation of cold water in the water cooler 31 cools each upper fixture 221 and lower fixture 211.

[0042] In a preferred embodiment, a water cooling pipe 32 is provided between the upper fixture 221 and the lower fixture 211 of each measuring unit 2, and a water stop clamp 33 is provided on the water cooling pipe 32. When only the front measuring units 2 are in use, the water stop clamp 33 of the rear measuring units 2 can be closed to cool the front measuring units 2.

[0043] When using the device of the present invention to conduct a high-throughput tensile test, since the diameter of the fiber monofilament test piece is too small, the test piece needs to be simply processed before the test. The test piece is adhered to two metal plates 231 using high-temperature resistant conductive glue, and the conductive metal tape 232 is adhered to the metal plate 231. When conducting the test, the upper clamp 221 and the lower clamp 211 clamp the metal plate 231 at both ends, and an asbestos gasket 235 is added between the two for insulation and heat insulation. Then, by controlling the motor of each test unit 2, a tensile or compression test is performed on the test piece being tested. When one or more test pieces break, the force sensor 213 receives the signal and provides timely feedback to achieve precise compensation and avoid stress fluctuations in the test piece. A high-precision displacement monitor is used to accurately measure the fracture displacement.

[0044] The device of the present invention has a simple structure and is easy to operate. It can significantly improve the efficiency of testing the high-temperature mechanical properties of fiber monofilaments and is expected to be promoted for use in laboratories.

[0045] The above embodiments are merely descriptions of preferred embodiments of the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to specific embodiments. Without departing from the spirit of the present invention, various modifications and improvements made by ordinary technicians in this field to the technical solution of the present invention should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A fiber monofilament high-temperature and high-throughput testing device, characterized by: It includes a load sharing tray, several measuring units and a cooling unit; The measuring unit includes a fixing component, a driving and loading component, and a heating component; The fixing assembly includes a lower clamp, a lower connecting rod and a force sensor; the lower clamp is fixed to the upper end of the lower connecting rod, and the lower end of the lower connecting rod is fixed to the load sharing plate through the force sensor; The driving loading assembly includes an upper clamp and an upper connecting rod; the upper clamp is located above the lower clamp; the upper clamp is fixed to the lower end of the upper connecting rod, and the upper connecting rod can move up and down, driving the upper clamp to move up and down accordingly; The heating assembly includes two sets of metal plates and conductive metal strips; Two metal plates are clamped on the upper fixture and the lower fixture respectively; two conductive metal strips are bonded to the metal plates by high-temperature resistant conductive adhesive; The two ends of the test piece are bonded to two metal plates using high-temperature resistant conductive adhesive. The heating assembly further includes a plurality of power supplies and wires; the number of the power supplies is equal to and corresponds to the number of measuring units, and each power supply is connected to two conductive metal strips of the corresponding measuring unit via a wire; The cooling unit includes a water cooler and several water cooling pipes; the upper clamp and the lower clamp of the measuring unit are both hollow structures; the outlet of the water cooler and the upper clamps of several measuring units are connected in series in sequence through the water cooling pipes, the upper clamp of the last measuring unit is connected to the lower clamp of the same measuring unit through the water cooling pipe, and the lower clamps of several measuring units and the inlet of the water cooler are connected in series in sequence through the water cooling pipes to form a series circuit.

2. The fiber monofilament high-temperature and high-throughput testing device according to claim 1, characterized in that: in, In each of the measuring units, a communicating water cooling pipe is provided between the upper fixture and the lower fixture, and a water stop clamp is provided on the water cooling pipe.

3. The fiber monofilament high-temperature and high-throughput testing device according to claim 1, characterized in that: in, The measuring unit further includes a displacement monitor, which is fixed on the load-sharing plate and monitors the state of the test piece measured by the measuring unit.

4. The fiber monofilament high-temperature and high-throughput testing device according to claim 1, characterized in that: in, The heating assembly also includes an infrared thermometer and a temperature controller; The infrared thermometer monitors the temperature of the test piece measured by the same measuring unit and transmits the temperature data to the temperature controller, which controls the output of the power supply of the same measuring unit according to the temperature data.

5. The fiber monofilament high-temperature and high-throughput testing device according to claim 1, characterized in that: in, Asbestos gaskets are provided between the upper clamp and the metal plate, and between the lower clamp and the metal plate.

6. The fiber monofilament high-temperature and high-throughput testing device according to claim 1, characterized in that: It also includes a rack, which is located above each measuring unit; The driving and loading assembly of each measuring unit further includes a screw and a rotating member; The rotating member is arranged in the frame and can rotate; The screw rod is vertically arranged above the upper connecting rod; the lower end of the screw rod is rotatably connected to the upper end of the upper connecting rod, and the screw rod can rotate relative to the upper connecting rod; the rotating member has a threaded hole, and the upper part of the screw rod is threadedly connected to the rotating member; The rotating part rotates, and the screw rod moves up and down with the rotation of the rotating part, and the upper connecting rod and the upper clamp move up and down accordingly.

7. The fiber monofilament high-temperature and high-throughput testing device according to claim 6, characterized in that: in, The rotating member is a rotating gear.

8. The fiber monofilament high-temperature and high-throughput testing device according to claim 7, characterized in that: in, The driving and loading assembly of each measuring unit further includes a motor and a driving gear; The motor is fixed on the frame, the driving gear is fixedly sleeved on the output shaft of the motor, and the driving gear is engaged with the rotating gear; the motor drives the rotating gear to rotate through the driving gear.

9. The fiber monofilament high-temperature and high-throughput testing device according to claim 8, characterized in that: in, The wires are placed on the frame.

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