A composite fiber tensile testing device

Abstract

The invention discloses a composite fiber tensile property testing device, which relates to the technical field of composite fiber tensile property testing tools, and comprises a pedestal and a door frame arranged on the top of the pedestal, a test box is installed above the mounting groove through a bracket, a lifting beam is slidably installed on the upper part of the door frame, a tension sensor is installed on the bottom surface of the lifting beam, a pull rod is installed on the bottom end of the tension sensor, and a clamping mechanism is installed on the mounting seat; a moving seat is installed on the driving seat of the linear motor, and a flame-spraying mechanism is installed on the moving seat; the invention facilitates effective clamping and fixing of the detected composite fiber through the cooperation of the clamping mechanism with the tension sensor and the pull rod, effectively prevents the situation that the clamping end of the composite fiber material breaks first during traditional chuck clamping testing, and can automatically increase the clamping force of the locking shaft on the composite fiber belt as the tension acting on the composite fiber belt increases, effectively preventing the end of the composite fiber belt from loosening or breaking first due to excessive tensile force.

Description

Technical Field

[0001] The invention relates to the technical field of composite fiber tensile testing tools, and in particular to a composite fiber tensile testing device. Background Art

[0002] The existing testing device for the tensile properties of composite fibers, namely the composite material tensile testing machine, is an experimental device specially used to test the tensile properties of composite materials. It can accurately evaluate the mechanical properties of composite fibers under tensile loads, and provide important data support for material research and development, production quality control and scientific research. The device fixes the sample between the upper and lower clamps through a mechanical structure and applies a tensile load. During the stretching process, the lower clamp is fixed and the upper clamp moves upward at a preset speed to apply continuous tension to the sample. At the same time, the built-in sensor of the device measures the force and deformation of the sample in real time. Through the test software, the tensile curve of the sample can be displayed in real time, the maximum force and deformation when the sample breaks can be recorded, and then the key performance indicators such as tensile strength and elastic modulus can be calculated. These indicators are of great significance for evaluating the mechanical properties of composite fibers and optimizing material design.

[0003] However, the existing equipment has the problem of insufficient clamping stability: most tensile performance testing devices adopt a chuck clamping method, and the traditional chuck clamping method is prone to the clamping end breaking first during the testing process, and the clamping force cannot be automatically adjusted as the tension increases, resulting in the composite fiber belt being loose or breaking first at the end when the tensile force is too large, affecting the accuracy of the test results; at the same time, the existing equipment can usually only perform tensile performance tests at room temperature, and cannot simulate the performance changes of composite fiber materials under extreme temperature conditions such as freezing or fire; it is impossible to perform comprehensive temperature adaptability tests on composite fiber materials, which limits the accurate evaluation of their tensile properties and toughness at different temperatures, and it is impossible to simultaneously test other important properties of composite fiber materials, such as flame retardant properties; therefore, the above problems need to be solved. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a composite fiber tensile testing device.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a composite fiber tensile testing device, comprising a pedestal and a door frame arranged on the top of the pedestal, a mounting groove is opened in the middle of the top surface of the pedestal, a test box is installed above the mounting groove through a bracket, a display screen for real-time display of tension values ​​is installed on one side of the door frame, a box door is hinged on the front end surface of the test box, a lifting beam is slidably installed on the upper part of the door frame, a tension sensor is installed on the bottom surface of the lifting beam, a pull rod is installed at the bottom end of the tension sensor, and the middle parts of the upper and lower ends of the test box are A mounting hole is opened, and guide ring seats are installed inside the two mounting holes, and a sealing assembly is installed inside the guide ring seat; a fixing seat is installed on the inner bottom surface of the mounting groove, and a fixing rod is vertically installed on the top of the fixing seat, the bottom end of the pull rod and the top end of the fixing rod both extend into the test box, and mounting seats are installed at the bottom end of the pull rod and the top end of the fixing rod, and a clamping mechanism is installed on the mounting seat; a linear motor is vertically installed on the rear end inner wall of the test box, a moving seat is installed on the driving seat of the linear motor, and an injection mechanism is installed on the moving seat.

[0006] Preferably, a thermostat is installed at the top rear end of the test box, and a heating machine for cooperating with the jet mechanism is installed in the lower part of the test box; the columns on both sides of the door frame are provided with vertically rotatable screws, the bottom ends of the screws are movably inserted into the base and are connected to a servo motor, a threaded seat is sleeved on the screw, and the end of the lifting beam is fixedly connected to the threaded seat.

[0007] Preferably, both sides of the inner bottom surface of the test box are provided with collecting grooves, a filter screen is installed on the top of the collecting groove, and a drain valve pipe is connected to the bottom of the rear end of the collecting groove.

[0008] Preferably, the clamping mechanism includes columns arranged at the four corners of the mounting seat, fixed blocks installed at the outer ends of the columns and T-slots opened on the columns, a fixed pressure shaft is provided between the two fixed blocks on both sides of the mounting seat, a guide rod is vertically installed in the T-slot, a pair of movable blocks are movably sleeved on the guide rod, a locking shaft is fixed between the movable blocks on both sides of the mounting seat, and a lifting spring is movably sleeved on the rod body of the guide rod away from the fixed block.

[0009] Preferably, the outer wall circumference of the fixed pressure shaft and the locking shaft is equidistantly protruded with a plurality of anti-slip strips, and the outer end surface of the anti-slip strip is equidistantly protruded with a plurality of high-temperature resistant anti-slip strips along the length direction, the two locking shafts are movably abutted against each other, and one of the locking shafts is movably abutted against the fixed pressure shaft; three connecting bolts are installed on the outer end surface of the fixed block, and three threaded deep holes are opened on the column.

[0010] Preferably, the jet mechanism includes an air supply chamber opened inside the movable seat, a fixed tube connected to the front end of the movable seat, a rotating disk sealed and rotatably mounted on the fixed tube, and an external gear ring fixedly connected to the rear end face of the rotating disk, a jet head is installed on the upper part of the front end face of the rotating disk, an ignition seat is installed on the rotating disk on one side of the jet head, a cold nozzle is installed on the lower part of the front end face of the rotating disk, a driving groove is opened on the inner wall of one side of the fixed tube, a micro motor is installed at the rear end of the driving groove, a driving gear is coaxially fixedly connected to the front end of the driving shaft of the micro motor, and the driving gear is meshed with the external gear ring for transmission.

[0011] Preferably, electronic valves are installed in the jet head and the cold jet head; connecting hoses are installed on both sides of the bottom of the movable seat, and a cooling machine is installed on one side of the lower part of the test box, the bottom end of one connecting hose is connected to the heating machine, and the bottom end of the other connecting hose is fixedly connected to the cooling machine.

[0012] Preferably, the sealing assembly includes a sealing ring cover installed on the top of the guide ring seat, an annular groove is provided on the inner side of the top surface of the guide ring seat, a fixed ring seat is installed in the annular groove, and a sealing airbag ring for movable sealing of the pull rod and the fixed rod is installed in the inner ring of the fixed ring seat.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention facilitates the effective clamping and fixing of the detected composite fiber through the cooperation of the clamping mechanism with the tension sensor and the pull rod, effectively preventing the composite fiber material clamping end from breaking first during the traditional chuck clamping test, and can automatically increase the clamping force of the locking shaft on the composite fiber belt as the tension acting on the composite fiber belt increases, effectively preventing the composite fiber belt from loosening or breaking first due to excessive tensile force.

[0015] 2. The present invention facilitates the tensile performance testing of composite fiber materials under normal temperature, frozen state and burned state by cooperating with the jet mechanism with the heating machine and the cooling machine, effectively improving the limit testing operation of the tensile performance of the composite fiber belt under different temperature environments, improving the accuracy of the tensile performance testing of the composite fiber belt, and performing the limit testing operation of the tensile performance of the composite fiber belt in a frozen state, and can test the toughness of the composite fiber material itself in a frozen state; at the same time, when testing the composite fiber under a burned state, not only can the tensile performance of the composite fiber belt under a high temperature environment be tested, but also the flame retardant performance of the composite fiber belt can be tested, effectively improving the efficiency and accuracy of the testing of the composite fiber belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention from a first viewing angle;

[0018] Figure 2 It is a schematic diagram of the overall structure of the present invention from a second viewing angle;

[0019] Figure 3 It is a schematic diagram of the overall structure of the present invention from a third viewing angle;

[0020] Figure 4 This is a schematic diagram of the structure of the present invention from a first viewing angle after the box door is removed;

[0021] Figure 5 This is a schematic diagram of the structure of the present invention from a second viewing angle after the box door is removed;

[0022] Figure 6 This is a third-angle structural diagram of the present invention after the box door is removed;

[0023] Figure 7 This is a schematic diagram of the main structure of the present invention after the box door is removed;

[0024] Figure 8 This is a schematic diagram of the internal structure of the test box of the present invention from a first viewing angle;

[0025] Fig. 9 This is a schematic diagram of the structure of the interior of the test box of the present invention from a second viewing angle;

[0026] Fig.10 This is a schematic diagram of the internal structure of the test box of the present invention from a third viewing angle;

[0027] Fig.11 It is a schematic diagram of the structure of the drain valve pipe and the filter screen plate of the present invention;

[0028] Fig.12 It is a schematic diagram of the structure of the pull rod and the clamping mechanism of the present invention;

[0029] Fig.13 It is a schematic diagram of the structure of the fixing seat, the fixing rod and the clamping mechanism of the present invention;

[0030] Fig.14 It is a schematic diagram of the three-dimensional structure of two clamping mechanisms of the present invention;

[0031] Fig.15 It is a schematic diagram of the structure of the linear motor and the moving seat of the present invention;

[0032] Fig.16It is a schematic diagram of the structure of the driving gear and the outer gear ring of the present invention;

[0033] Fig.17 It is a schematic diagram of the three-dimensional structure of the clamping mechanism of the present invention;

[0034] Fig.18 It is a schematic diagram of the structure of the guide rod, the locking shaft and the lifting spring of the present invention;

[0035] Fig.19 It is a schematic diagram of the structure of the composite fiber tape of the present invention in a winding state;

[0036] Fig. 20 It is a schematic diagram of the structure of the guide ring seat and the sealing ring cover of the present invention;

[0037] Fig.21 It is a schematic diagram of the structure of the fixed ring seat and the sealing airbag ring of the present invention.

[0038] Serial numbers in the figure: 1. pedestal; 2. door frame; 3. display screen; 4. lifting beam; 5. test box; 6. box door; 7. tension sensor; 8. guide ring seat; 9. pull rod; 10. fixed seat; 11. fixed rod; 12. mounting seat; 13. linear motor; 14. drain valve pipe; 15. filter screen; 16. column; 17. fixed block; 18. fixed pressure shaft; 19. guide rod; 20. movable block; 21. locking shaft; 22. lifting spring; 23. connecting bolt; 24. heating machine; 25. moving seat; 26. rotating disk; 27. jet head; 28. ignition seat; 29. ​​cold nozzle; 30. connecting hose; 31. driving gear; 32. outer gear ring; 33. sealing ring cover; 34. fixed ring seat; 35. sealing airbag ring. DETAILED DESCRIPTION

[0039] 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.

[0040] Example 1: See Figures 1 to 21A composite fiber tensile property testing device comprises a pedestal 1 and a door frame 2 arranged on the top of the pedestal 1, a mounting groove is provided in the middle of the top surface of the pedestal 1, a test box 5 is installed above the mounting groove through a bracket, a display screen 3 for real-time display of tension values ​​is installed on one side of the door frame 2, a box door 6 is hinged on the front end surface of the test box 5, a lifting beam 4 is slidably installed on the upper part of the door frame 2, a tension sensor 7 is installed on the bottom surface of the lifting beam 4, a pull rod 9 is installed at the bottom end of the tension sensor 7, mounting holes are provided in the middle of the upper and lower ends of the test box 5, guide ring seats 8 are installed inside the two mounting holes, and a sealing assembly is installed inside the guide ring seat 8; the sealing assembly comprises a sealing ring cover 33 installed on the top of the guide ring seat 8, an annular groove is provided on the inner side of the top surface of the guide ring seat 8, and a sealing ring cover 33 is provided on the inner side of the top surface of the guide ring seat 8. A fixed ring seat 34 is installed, and a sealing airbag ring 35 for movable sealing of the pull rod 9 and the fixed rod 11 is installed in the inner ring of the fixed ring seat 34; through the setting of the sealing component, it is possible to avoid the existence of a gap between the rod bodies of the pull rod 9 and the fixed rod 11 when passing through the test box 5, which may affect the internal temperature of the test box 5; through the cooperation of the clamping mechanism with the tension sensor 7 and the pull rod 9, it is convenient to effectively clamp and fix the detected composite fiber, and effectively prevent the clamping end of the composite fiber material from breaking first during the traditional chuck clamping test, and can automatically increase the clamping force of the locking shaft 21 on the composite fiber belt as the tension acting on the composite fiber belt increases, effectively avoiding the loosening or first breaking of the end of the composite fiber belt due to excessive tensile force.

[0041] In the present invention, a fixing seat 10 is installed on the inner bottom surface of the mounting groove, a fixing rod 11 is vertically installed on the top of the fixing seat 10, the bottom end of the pull rod 9 and the top end of the fixing rod 11 both extend into the interior of the test box 5, and a mounting seat 12 is installed on the bottom end of the pull rod 9 and the top end of the fixing rod 11, and a clamping mechanism is installed on the mounting seat 12; a linear motor 13 is vertically installed on the rear end inner wall of the test box 5, a moving seat 25 is installed on the driving seat of the linear motor 13, and an injection mechanism is installed on the moving seat 25 A thermostat is installed at the top rear end of the test box 5, and a heating machine 24 for cooperating with the jet mechanism is installed in the lower part of the test box 5; a lead screw is provided inside the columns on both sides of the door frame 2 for vertical rotation, and the bottom end of the lead screw movably penetrates into the inside of the pedestal 1 and is connected to a servo motor; a threaded seat is sleeved on the lead screw, and the end of the lifting beam 4 is fixedly connected to the threaded seat; collecting grooves are provided on both sides of the inner bottom surface of the test box 5, and a filter screen plate 15 is installed on the top of the collecting groove, and a drain valve pipe 14 is provided at the bottom of the rear end of the collecting groove.

[0042] Embodiment 2: The technical solution is basically the same as that of Embodiment 1, except that Figures 11 to 21As shown, the clamping mechanism includes columns 16 arranged at the four corners of the mounting seat 12, fixed blocks 17 installed at the outer ends of the columns 16 and T-slots opened on the columns 16, a fixed pressure shaft 18 is arranged between the two fixed blocks 17 on both sides of the mounting seat 12, a guide rod 19 is vertically installed in the T-slot, a pair of movable blocks 20 are movably sleeved on the guide rod 19, a locking shaft 21 is fixedly connected between the movable blocks 20 on both sides of the mounting seat 12, and a lifting spring 22 is movably sleeved on the rod body of the guide rod 19 away from the fixed block 17; a plurality of anti-slip strips are equidistantly protruded on the outer wall periphery of the fixed pressure shaft 18 and the locking shaft 21, and the anti-slip The outer end surface of the strip is equidistantly protruded with multiple high-temperature resistant anti-slip strips along the length direction, and two locking shafts 21 are movably abutted against each other, and one of the locking shafts 21 is movably abutted against the fixed pressure shaft 18; three connecting bolts 23 are installed on the outer end surface of the fixed block 17, and the three connecting bolts 23 are arranged in a triangular distribution, and three threaded deep holes matching the connecting bolts 23 are opened on the column 16; the fixing block 17 can be stably installed on the end of the column 16 through the connecting bolts 23, and the pulling force can be avoided to pull the fixing block 17 and the column 16 apart, thereby improving the connection strength and stability between the two.

[0043] In the present invention, the jet mechanism includes an air supply chamber opened inside the moving seat 25, a fixed pipe connected to the front end of the moving seat 25, a rotating disk 26 sealed and rotatably mounted on the fixed pipe, and an outer gear ring 32 fixedly connected to the rear end face of the rotating disk 26. A jet head 27 is installed on the upper front end face of the rotating disk 26, an ignition seat 28 is installed on the rotating disk 26 on one side of the jet head 27, a cold jet head 29 is installed on the lower front end face of the rotating disk 26, a driving groove is opened on the inner wall of one side of the fixed pipe, and a micro-jet is installed at the rear end of the driving groove. The front end of the driving shaft of the micro motor is coaxially fixed with a driving gear 31, and the driving gear 31 is meshed with the outer gear ring 32 for transmission; the jet head 27 and the cold jet head 29 are both equipped with electronic valves; by starting the micro motor to drive the driving gear 31 to rotate, the driving gear 31 is meshed with the outer gear ring 32 to drive the rotating disk 26 to rotate, and the jet head 27 and the cold jet head 29 can be driven to rotate to perform surface freezing or burning of the composite fiber belt, so as to increase the burning area or the freezing area; the bottom of the mobile seat 25 Connecting hoses 30 are installed on both sides of the part, and a cooling machine is installed on one side of the lower part of the test box 5, wherein the bottom end of one connecting hose 30 is connected to the heating machine 24, and the bottom end of the other connecting hose 30 is fixedly connected to the cooling machine; the present invention facilitates the tensile performance detection operation of the composite fiber material under normal temperature, frozen state and burned state through the cooperation of the jet mechanism with the heating machine 24 and the cooling machine, effectively improves the limit detection operation of the tensile performance of the composite fiber belt under different temperature environments, improves the accuracy of the tensile performance detection of the composite fiber belt, and performs the limit detection operation of the tensile performance of the composite fiber belt in the frozen state, and can detect the toughness of the composite fiber material itself in the frozen state; at the same time, when the composite fiber is detected in the burned state, not only can the tensile performance of the composite fiber belt in the high temperature environment be detected, but also the flame retardant performance of the composite fiber belt can be detected, effectively improving the efficiency and accuracy of the detection of the composite fiber belt.

[0044] Working principle: In this embodiment, the present invention also proposes a method for using a composite fiber tensile testing device, comprising the following steps:

[0045] Step 1: First, power on the electrical appliances of the device, then open the box door 6 and fix the two ends of the composite fiber belt to be tested for tensile performance on the two clamping mechanisms respectively. At this time, the end of the composite fiber belt to be tested passes between the two locking shafts 21 and bypasses the fixed pressure shaft 18. At this time, the end of the composite fiber belt will be locked by the two locking shafts 21 and the fixed pressure shaft 18 under the action of the lifting spring 22, and when the two clamping mechanisms perform a stretching operation on the composite fiber belt, the belt body wound around the locking shaft 21 by the end of the composite fiber belt can automatically start to apply a clamping force to the locking shaft 21, thereby preventing the composite fiber belt from loosening during the tensile test; then close the box door 6 to perform a tensile performance test at room temperature;

[0046] Step 2, when testing under normal temperature, the servo motor is started to drive the lead screw to rotate, and the lead screw is rotated to drive the lifting beam 4 to rise. When the lifting beam 4 rises, the pull rod 9 installed at the bottom end of the tension sensor 7 is driven to rise, and the raised pull rod 9 drives the clamping mechanism installed at its bottom end to rise in the test box 5, and the distance between the two clamping mechanisms is increased, and then the clamped composite fiber belt is stretched until it is broken, and then the ultimate tensile value of the composite fiber belt measured under normal temperature is transmitted to the display screen 3 for display through the tension sensor 7. After completing the normal temperature tensile performance test of this composite fiber belt, the lifting beam 4 is driven to reset, and then the box door 6 is opened to remove the broken composite fiber belt. At this time, the broken composite fiber belt is not subjected to tension, and the clamping force of the clamping mechanism on the composite fiber belt is not large, which is convenient for removing the broken composite fiber belt;

[0047] Step three, when the tensile performance of the same composite fiber belt in a frozen state is tested, the composite fiber belt is also clamped and fixed by the clamping mechanism, and then the thermostat is started to cool the inside of the test box 5 for one to two hours, and then the refrigeration machine is started to supply cold air to the inside of the movable seat 25, and then the electronic valve on the cold nozzle 29 is opened to spray the cold air inside the movable seat 25 onto the surface of the composite fiber belt, and the linear motor 13 is started to drive the movable seat 25 to perform a reciprocating lifting motion, so that the composite fiber belt can be fixed vertically. The fiber belt is frozen, and the servo motor and the lead screw cooperate again to drive the lifting beam 4 to rise. When the lifting beam 4 rises, the pull rod 9 installed at the bottom of the tension sensor 7 is driven to rise. The raised pull rod 9 drives the clamping mechanism installed at its bottom to rise in the test box 5. The distance between the two clamping mechanisms is increased, and the clamped composite fiber belt is stretched until it is broken. Then, the low-temperature limit tensile value of the composite fiber belt measured in the frozen state is transmitted to the display screen 3 for display through the tension sensor 7;

[0048] Step 4, when the tensile performance of the same composite fiber belt is tested under the burning state, the composite fiber belt is also clamped and fixed by the clamping mechanism, and then the constant temperature machine is started to heat the inside of the test box 5 for half an hour, and then the heating machine 24 is started to supply gas to the inside of the movable seat 25, and then the electronic valve on the nozzle 27 is opened to spray the gas, and then the ignition seat 28 is started to ignite the gas, and then the flame sprayed by the nozzle 27 is sprayed on the surface of the composite fiber belt, and then the composite fiber belt is burned, and the linear motor 13 is started to drive the movable seat 25 to perform reciprocating lifting and lowering movements, so that the composite fiber belt fixed vertically can be reciprocated by burning and heating, and the composite fiber belt can be observed through the transparent glass window tube on the box door 6. Whether the composite fiber belt changes color and melts after being burned, the servo motor and the lead screw are used to drive the lifting beam 4 to rise again. When the lifting beam 4 rises, the pull rod 9 installed at the bottom of the tension sensor 7 is driven to rise. The raised pull rod 9 drives the clamping mechanism installed at its bottom to rise in the test box 5. The distance between the two clamping mechanisms is increased, and the clamped composite fiber belt is stretched in the state of burning until it is broken. Then, the low-temperature limit tensile value of the composite fiber belt measured in the state of burning is transmitted to the display screen 3 through the tension sensor 7 for display; not only can the tensile performance of the composite fiber belt in a high temperature environment be tested, but also the flame retardant performance of the composite fiber belt can be tested;

[0049] Step 5, after completing the tensile performance test of the composite fiber in the room temperature state, the frozen state and the burned state, open the box door 6 to clean out the composite fiber belt inside the test box 5, and discharge the water generated when the frozen state and the burned state alternately exist from the collection tank through the drain valve pipe 14.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A composite fiber tensile testing device, comprising a base (1) and a door frame (2) arranged on the top of the base (1), characterized in that: A mounting groove is provided in the middle of the top surface of the pedestal (1), a test box (5) is installed above the mounting groove via a bracket, a display screen (3) for real-time display of tension values ​​is installed on one side of the door frame (2), a box door (6) is hingedly connected to the front end surface of the test box (5), a lifting beam (4) is slidably installed on the upper part of the door frame (2), a tension sensor (7) is installed on the bottom surface of the lifting beam (4), a pull rod (9) is installed at the bottom end of the tension sensor (7), mounting holes are provided in the middle of the upper and lower ends of the test box (5), guide ring seats (8) are installed inside the two mounting holes, and a sealing component is installed inside the guide ring seat (8); A fixing seat (10) is installed on the inner bottom surface of the installation groove, a fixing rod (11) is vertically installed on the top of the fixing seat (10), the bottom end of the pull rod (9) and the top end of the fixing rod (11) both extend into the interior of the test box (5), and a fixing seat (12) is installed on the bottom end of the pull rod (9) and the top end of the fixing rod (11), and a clamping mechanism is installed on the fixing seat (12); A linear motor (13) is vertically mounted on the inner wall at the rear end of the test box (5), a moving seat (25) is mounted on the driving seat of the linear motor (13), and an air jet mechanism is mounted on the moving seat (25).

2. A composite fiber tensile testing device according to claim 1, characterized in that: A thermostat is installed at the rear end of the top of the test box (5), and a heating machine (24) for cooperating with the jet mechanism is installed in the lower part of the test box (5); the columns on both sides of the door frame (2) are provided with vertically rotatable screws, the bottom end of the screws movably penetrates into the inside of the pedestal (1) and is connected to a servo motor, a threaded seat is sleeved on the screw, and the end of the lifting beam (4) is fixedly connected to the threaded seat.

3. A composite fiber tensile testing device according to claim 1, characterized in that: Collection grooves are provided on both sides of the inner bottom surface of the test box (5), a filter screen plate (15) is installed on the top of the collection groove, and a drain valve pipe (14) is provided at the bottom of the rear end of the collection groove.

4. A composite fiber tensile testing device according to claim 1, characterized in that: The clamping mechanism comprises columns (16) arranged at four corners of the mounting seat (12), fixed blocks (17) installed at the outer ends of the columns (16) and T-shaped slots provided on the columns (16); a fixed pressure shaft (18) is provided between the two fixed blocks (17) on both sides of the mounting seat (12); a guide rod (19) is vertically installed in the T-shaped slot; a pair of movable blocks (20) are movably sleeved on the guide rod (19); a locking shaft (21) is fixedly connected between the movable blocks (20) on both sides of the mounting seat (12); and a lifting spring (22) is movably sleeved on the rod body of the guide rod (19) away from the fixed block (17).

5. A composite fiber tensile testing device according to claim 4, characterized in that: The outer wall circumference of the fixed pressure shaft (18) and the locking shaft (21) is protruded with a plurality of anti-slip strips, and the outer end surface of the anti-slip strip is protruded with a plurality of high-temperature resistant anti-slip strips at equal intervals along the length direction. The two locking shafts (21) are movably abutted against each other, and one of the locking shafts (21) is movably abutted against the fixed pressure shaft (18); three connecting bolts (23) are installed on the outer end surface of the fixed block (17), and three threaded deep holes are opened on the column (16).

6. A composite fiber tensile testing device according to claim 2, characterized in that: The jet mechanism comprises an air supply cavity provided inside the movable seat (25), a fixed tube connected to the front end of the movable seat (25), a rotating disk (26) sealed and rotatably mounted on the fixed tube, and an outer toothed ring (32) fixedly connected to the rear end surface of the rotating disk (26); a jet head (27) is mounted on the upper part of the front end surface of the rotating disk (26); an ignition seat (28) is mounted on the rotating disk (26) on one side of the jet head (27); a cold jet head (29) is mounted on the lower part of the front end surface of the rotating disk (26); a driving groove is provided on the inner wall of one side of the fixed tube; a micro motor is mounted at the rear end of the driving groove; a driving gear (31) is coaxially fixedly connected to the front end of the driving shaft of the micro motor; the driving gear (31) is meshed with the outer toothed ring (32) for transmission.

7. A composite fiber tensile testing device according to claim 6, characterized in that: The spray head (27) and the cold spray head (29) are both equipped with electronic valves; connecting hoses (30) are installed on both sides of the bottom of the movable seat (25); a cooling machine is installed on one side of the lower part of the test box (5); the bottom end of one connecting hose (30) is connected to the heating machine (24), and the bottom end of the other connecting hose (30) is fixedly connected to the cooling machine.

8. A composite fiber tensile testing device according to claim 1, characterized in that: The sealing assembly comprises a sealing ring cover (33) mounted on the top of a guide ring seat (8); an annular groove is provided on the inner side of the top surface of the guide ring seat (8); a fixed ring seat (34) is installed in the annular groove; a sealing airbag ring (35) for movable sealing of a pull rod (9) and a fixed rod (11) is installed in the inner ring of the fixed ring seat (34).

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