A ceramic fiber tensile strength testing fixture assembly

Abstract

The application discloses a clamp assembly for detecting the tensile strength of ceramic fibers and belongs to the technical field of equipment for detecting the tensile strength of ceramic fibers. The clamp assembly comprises a fixed block with an inner cavity, opposite ends of the fixed block are respectively provided with an insertion cavity and a glue injection pipe which are in communication with the inner cavity, and a hanging part is detachably connected above the glue injection pipe. A plug with a central hole is inserted into the end of the insertion cavity, and the end of the ceramic fiber is placed into the inner cavity through the central hole of the plug. The end of the ceramic limiting wire is fixed by means of epoxy resin adhesion, so that the breakage of the ceramic fiber in the installation process is effectively avoided.

Description

Technical Field

[0001] This application belongs to the technical field of ceramic fiber tensile strength testing equipment, specifically relating to a fixture assembly for testing the tensile strength of ceramic fibers. Background Technology

[0002] Tensile strength testing, performed using a tensile testing machine, determines the maximum tensile strength of ceramic fibers under axial load, directly reflecting their mechanical properties against fracture.15 This indicator is crucial for ensuring the reliability of the fibers under stress in applications.

[0003] Because ceramic fibers are highly brittle, they are easily broken when the tensile testing machine clamps them by squeezing during tensile strength testing, resulting in serious waste of the test sample. Utility Model Content

[0004] The technical problem to be solved by this application is to overcome the shortcomings of the prior art and provide a fixture assembly for testing the tensile strength of ceramic fibers. This application uses epoxy resin to fix the end of the ceramic limiting wire by adhesive, which effectively avoids damage to the ceramic fiber wire during the installation process.

[0005] The technical solution adopted by this application to solve its existing problems is: A fixture assembly for testing the tensile strength of ceramic fibers includes a fixing block with an inner cavity. At opposite ends of the fixing block, there are insertion cavities and a glue injection tube that are connected through the inner cavity. A hanging part is detachably connected to the top of the glue injection tube.

[0006] A plug with a central hole is inserted into the end of the insertion cavity, and the end of the ceramic fiber filament passes through the central hole of the plug and is placed into the inner cavity.

[0007] Preferably, the plug is made of rubber material, and the central hole of the plug is frustum-shaped, with the inner diameter of the larger end of the central hole being larger than the outer diameter of the ceramic fiber filament.

[0008] Preferably, the outer wall of the injection tube is provided with external threads.

[0009] The mounting part includes a threaded sleeve with internal threads, which is threadedly connected to the glue injection tube.

[0010] Preferably, the mounting part includes a connecting block, with a rotating sleeve and a mounting hole respectively provided at opposite ends of the connecting block, and a turntable provided at the end of the screw sleeve away from the fixing block, wherein the rotating sleeve and the turntable are coaxially rotatably connected.

[0011] Preferably, the circumferential surface of the turntable is recessed with an annular groove, and the inner wall of the rotating sleeve is provided with a protruding ring, which is inserted into the annular groove of the turntable.

[0012] Preferably, the mounting hole is a polygonal hole.

[0013] Preferably, the fixing block has a slider protruding from its exterior and arranged axially along the injection tube.

[0014] The connecting block has an extended groove facing the fixed block, and the slider is connected to the groove.

[0015] Preferably, the end face of the fixing block is provided with a T-shaped plate, and the T-shaped plate is provided with a threaded hole.

[0016] The T-shaped plates of the ceramic fiber filament fixing blocks at both ends are inserted into the T-shaped grooves on the end face of the limiting plate. The end face of the limiting plate is provided with a waist-shaped hole that is connected to the T-shaped groove. A fastening bolt is inserted inside the waist-shaped hole, and the fastening bolt is threadedly connected to the threaded hole.

[0017] Preferably, the screw sleeve is externally fixed with a coaxially arranged handle.

[0018] Compared with the prior art, the beneficial effects of this application are as follows: (1) By squeezing the rubber plug and fixing the ends of the ceramic fiber filaments with the cured epoxy resin, the problem of fracture caused by hard extrusion in the prior art is solved, and damage to the sample is avoided during the installation process.

[0019] (2) It is connected to the tensile strength tester by hooking to realize the rapid replacement of multiple fixtures and specimens. Attached Figure Description

[0020] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a first structural diagram of a fixture assembly for testing the tensile strength of ceramic fibers according to this application. Figure 2 This is a cross-sectional view of a single-sided clamp in a clamp assembly for testing the tensile strength of ceramic fibers according to this application. Figure 3 This is an exploded view of a single-sided fixture. Figure 4 This is a structural diagram of the fixing part in a single-sided clamp. Figure 5 This is a schematic diagram of the hook-up portion in a single-sided clamp. Figure 6 This is a second structural diagram of a fixture assembly for testing the tensile strength of ceramic fibers according to this application. Figure 7 This is a structural diagram of a fixture assembly for testing the tensile strength of ceramic fibers during the glue injection process, as described in this application. Figure 8 This is a diagram showing the bonding process during epoxy resin curing. Figure 9 for Figure 8 sectional view, Figure 10 This is a structural diagram of the limiting plate.

[0022] In the diagram: 1-Fixing block, 101-Inner cavity, 102-Insertion cavity, 103-Injection tube, 104-Slider, 105-T-shaped plate, 106-Threaded hole, 2-Plug, 3-Threaded sleeve, 301-Turntable, 302-Handle, 4-Connecting block, 401-Turn sleeve, 402-Protruding ring, 403-Hanging hole, 404-Slide groove, 5-Ceramic fiber filament, 6-Limiting plate, 601-Oval hole, 7-Fasting bolt. Detailed Implementation

[0023] The attached figure shows a preferred embodiment of the fixture assembly for testing the tensile strength of ceramic fibers. The present application will be further described in detail below with reference to the attached figure.

[0024] Depend on Figures 1 to 10 As shown, a fixture assembly for testing the tensile strength of ceramic fibers includes a fixing block 1 with an inner cavity 101. At opposite ends of the fixing block 1, there are insertion cavities 102 and glue injection tubes 103 that are connected through the inner cavity 101. A hook is detachably connected to the top of the glue injection tube 103, and the hook is used to connect to the mounting plate of the tensile strength testing machine.

[0025] A plug 2 with a central hole is inserted into the end of the insertion cavity 102, and the end of the ceramic fiber filament 5 passes through the central hole of the plug 2 and is placed into the inner cavity 101.

[0026] The plug 2 is made of rubber material. The central hole of the plug 2 is frustum-shaped. The inner diameter of the large end of the central hole is larger than the outer diameter of the ceramic fiber filament 5, and the inner diameter of the small end of the central hole is less than or equal to the outer diameter of the ceramic fiber filament 5.

[0027] First, separate the connecting part, and pass one end of the ceramic fiber filament 5 through the plug 2, inserting it from the large end of the central hole of the plug 2 and exiting from the small end. After completion, insert the plug 2 into the insertion cavity 102. Under the compression of the insertion cavity 102, the plug 2 squeezes the ceramic limiting filament 5 and clamps it.

[0028] Then, the mixed epoxy resin is injected into the inner cavity 101 through the injection tube 103. After the epoxy resin cures, the ceramic fiber filaments 5 are fixed. Then, it is connected to the rope strength testing machine through the hanging part.

[0029] After completing the tensile strength test, remove the fixing block 1 and place it in a heating furnace to heat until the epoxy resin melts. Then remove the plug 2 and blow out the epoxy resin from the inner cavity 101 using high-pressure air, so that the fixing block 1 can be reused.

[0030] The glue injection tube 103 has external threads on its outer wall. The hook-on part includes a threaded sleeve 3 with internal threads, which is threadedly connected to the glue injection tube 103. A coaxially arranged handle 302 is fixed to the outside of the threaded sleeve 3, which facilitates the rotation of the threaded sleeve 3 by means of the handle 302.

[0031] Furthermore, the mounting part includes a connecting block 4, with a rotating sleeve 401 and a mounting hole 403 at opposite ends of the connecting block 4. The mounting hole 403 is a polygonal hole. A plug rod is fixed on the mounting plate of the tensile strength testing machine. The plug rod has the same shape as the mounting hole 403 and can be quickly assembled and disassembled by plugging it in. The polygonal mounting hole 403 also prevents shaking.

[0032] The end of the screw sleeve 3 facing away from the fixing block 1 is provided with a turntable 301, and the turntable 401 is coaxially rotatably connected to the turntable 301.

[0033] The circumferential surface of the turntable 301 is recessed with an annular groove, and the inner wall of the rotating sleeve 401 is provided with a protruding ring 402. The protruding ring 402 is inserted into the annular groove of the turntable 301 to prevent the connecting block 4 from disengaging from the screw sleeve 3.

[0034] The fixing block 1 has a protruding slider 104 arranged axially along the glue injection tube 103. The connecting block 4 has an extended groove 404 facing the fixing block 1. The slider 104 is connected to the groove 404. The slider 104 is inserted into the groove 404 first, and then the glue injection tube 103 contacts the screw sleeve 3. The cooperation between the two prevents rotation when the fixing part formed by the fixing block 1 is connected to the hanging part.

[0035] When injecting epoxy resin, a curing period is required. To accelerate curing, the entire assembly can be placed in an induction furnace and cured using a stepped temperature increase method from 40℃ to 80℃ to 100℃, which can shorten the curing time to 4-6 hours. To allow for overall movement during transport without damaging the ceramic fiber filaments 5, the following structure is added in this embodiment.

[0036] The fixed block 1 has a T-shaped plate 105 protruding from its end face, and the T-shaped plate 105 has a threaded hole 106.

[0037] The T-shaped plates 105 of the fixing blocks 1 at both ends of the ceramic fiber filament 5 are inserted into the T-shaped grooves on the end face of the limiting plate 6. The end face of the limiting plate 6 is provided with a waist-shaped hole 601 that is connected to the T-shaped groove. A fastening bolt 7 is inserted inside the waist-shaped hole 601, and the fastening bolt 7 is threadedly connected to the threaded hole 106.

[0038] The fixing blocks 1 at both ends of the ceramic limiting wire 5 are fixed by the limiting plate 6, and the distance between the two fixing blocks 1 can be adjusted to accommodate ceramic limiting wires 5 of different lengths.

[0039] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A fixture assembly for testing the tensile strength of ceramic fibers, characterized in that: It includes a fixing block (1) with an inner cavity (101), and the two opposite ends of the fixing block (1) are respectively provided with an insertion cavity (102) that is in communication with the inner cavity (101) and an injection tube (103). The injection tube (103) is detachably connected to a hanging part. A plug (2) with a central hole is inserted into the end of the insertion cavity (102), and the end of the ceramic fiber filament (5) passes through the central hole of the plug (2) and is placed into the inner cavity (101).

2. The fixture assembly for testing the tensile strength of ceramic fibers according to claim 1, characterized in that: The plug (2) is made of rubber material. The central hole of the plug (2) is frustum-shaped, and the inner diameter of the large end of the central hole is larger than the outer diameter of the ceramic fiber filament (5).

3. The fixture assembly for testing the tensile strength of ceramic fibers according to claim 1, characterized in that: The outer wall of the glue injection tube (103) is provided with external threads; The mounting part includes a threaded sleeve (3) with internal threads, which is threadedly connected to the glue injection tube (103).

4. The fixture assembly for testing the tensile strength of ceramic fibers according to claim 3, characterized in that: The mounting part includes a connecting block (4), and the two opposite ends of the connecting block (4) are respectively provided with a rotating sleeve (401) and a mounting hole (403). The end of the screw sleeve (3) away from the fixing block (1) is provided with a turntable (301). The rotating sleeve (401) and the turntable (301) are coaxially rotatably connected.

5. A fixture assembly for testing the tensile strength of ceramic fibers according to claim 4, characterized in that: The circumferential surface of the turntable (301) is recessed with an annular groove, and the inner wall of the rotating sleeve (401) is provided with a protruding ring (402), which is inserted into the annular groove of the turntable (301).

6. A fixture assembly for testing the tensile strength of ceramic fibers according to claim 4 or 5, characterized in that: The mounting hole (403) is a polygonal hole.

7. A fixture assembly for testing the tensile strength of ceramic fibers according to claim 4 or 5, characterized in that: The fixing block (1) has a slider (104) protruding from the outside and arranged along the axial direction of the glue injection tube (103). The connecting block (4) is provided with an extended slide groove (404) in the direction of the fixed block (1), and the slider (104) is connected to the slide groove (404).

8. A fixture assembly for testing the tensile strength of ceramic fibers according to claim 5, characterized in that: The fixed block (1) has a T-shaped plate (105) protruding from its end face, and the T-shaped plate (105) has a threaded hole (106). The T-shaped plates (105) of the fixing blocks (1) at both ends of the ceramic fiber filament (5) are inserted into the T-shaped grooves on the end face of the limiting plate (6). The end face of the limiting plate (6) is provided with a waist-shaped hole (601) that is connected to the T-shaped groove. A fastening bolt (7) is inserted inside the waist-shaped hole (601). The fastening bolt (7) is threadedly connected to the threaded hole (106).

9. A fixture assembly for testing the tensile strength of ceramic fibers according to any one of claims 3 to 5, characterized in that: The screw sleeve (3) is externally fixed with a handle (302) arranged coaxially.

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