Clamp for basalt fiber composite bar tensile test
By designing a fixture for basalt fiber composite ribs, tight clamping is achieved using variable diameter threads and rubber pads, and combined with a slip detection device, the problems of crushing and slipping in the tensile test of basalt fiber composite ribs are solved, and the problems of crushing and slipping in the tensile test of basalt fiber composite ribs are improved. Test accuracy and efficiency.
Patent Information
- Application Number
- CN202420628127.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-28
AI Technical Summary
Basalt fiber composite ribs often experience clamping and slipping during tensile tests, resulting in low test accuracy and efficiency. The unstable bonding quality of the existing clamping methods is the main problem.
A fixture including an inner sleeve, an outer sleeve and a fixing frame is designed, with prefabricated diameter-reducing threads outside the inner sleeve and prefabricated internal threads on the inner wall of the outer sleeve. The fixing frame is equipped with a slip detection device, and the diameter-reducing threads and rubber linings are used. The pads are tightly clamped, and a slip detection device is used to monitor whether slip occurs during the test.
It effectively avoids slippage and crushing at the clamping site, improves the accuracy and efficiency of the test, reduces the repeated production of the clamping device, and improves the experimental efficiency.
Smart Images
Figure CN222166727U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of auxiliary clamps for tensile tests, and in particular relates to a clamp used for tensile tests of basalt fiber composite bars. Background Art
[0002] Basalt fiber composite bar is a new type of composite material with high strength, low density and corrosion resistance. The tensile strength test of basalt fiber composite bar is an important indicator to detect whether the material is qualified. According to actual application, when the basalt fiber composite bar is subjected to tensile test, the basalt fiber composite bar often produces the phenomenon of crushing and slipping at the supporting part of the tensile testing machine.
[0003] At present, most clamping methods use metal sleeves and structural adhesives for bonding and anchoring. However, due to the different types of structural adhesives, different curing effects and different surface characteristics of basalt fiber composite bars, slippage and tearing of the bonding parts may occur, which seriously affects the accuracy and efficiency of the basalt fiber composite bar tensile test. Utility Model Content
[0004] The utility model aims to provide a fixture for basalt fiber composite reinforcement tensile test, so as to solve the problem that the test accuracy and efficiency are affected by the unstable quality of on-site bonding and anchoring in the existing experimental process.
[0005] The utility model is realized by the following technical solutions:
[0006] A fixture for basalt fiber composite reinforcement tensile test, comprising an inner sleeve, an outer sleeve and a fixing frame;
[0007] The outer part of the inner sleeve is prefabricated with a reducing thread, the head diameter of the reducing thread is smaller than the tail, and a deformed opening is prefabricated at the tail of the reducing thread; the inner diameter of the inner sleeve matches the basalt fiber composite reinforcement to be tested;
[0008] The inner wall of the outer sleeve is prefabricated with an internal thread, and the outer wall is prefabricated with a thread protrusion; the internal thread is engaged with the thinnest part of the head of the reducing thread;
[0009] The top of the fixing frame is provided with threaded steel bars, and the middle part is provided with a slip detection device, which is used to detect whether the basalt fiber composite bar to be tested slips;
[0010] When in use, the basalt fiber composite bar to be tested is inserted into the inner sleeve, the outer sleeve is screwed onto the outside of the inner sleeve, and the outer sleeve is screwed into the lower part of the fixing frame.
[0011] Furthermore, a rubber gasket is arranged on the inner wall of the inner sleeve.
[0012] Furthermore, a threaded hole is connected to the lower part of the fixing frame, a connecting pipe is connected to the lower part of the threaded hole, the outer sleeve is screwed into the connecting pipe, and the head of the basalt fiber composite bar to be tested is exposed from the threaded hole.
[0013] Furthermore, the length of the inner sleeve is at least two-thirds of the length of the basalt fiber composite bar to be tested.
[0014] Furthermore, the difference between the inner diameter of the inner sleeve and the outer diameter of the basalt fiber composite bar to be tested is within 0.5 mm.
[0015] Furthermore, the opening length of the deformation opening is two-thirds of the length of the inner sleeve.
[0016] Furthermore, the difference in outer diameter between the head of the reducing thread and the tail of the reducing thread must be at least 2 mm.
[0017] Furthermore, a limiting device is provided at the lower part of the fixing frame to prevent the outer sleeve 2 from being screwed in too deeply.
[0018] Furthermore, the slip detection device includes a signal transmitter, a signal receiver and a slip indicator light, and the signal transmitter and the signal receiver are arranged on both sides of the basalt fiber composite bar to be tested.
[0019] Compared with the prior art, the utility model has the following beneficial technical effects:
[0020] The utility model provides a fixture for tensile testing of basalt fiber composite bars, including an inner sleeve and an outer sleeve, the outer side of the inner sleeve is a variable diameter thread, and the large diameter end of the variable diameter thread is prefabricated with a deformation opening, which can produce partial deformation so as to engage with the fiber bar; by tightening the inner and outer threaded sleeves of different diameters, the sleeve assembly is tightly fixed to the surface of the basalt fiber composite bar. At the same time, a slip detection device is arranged on the upper part, which is convenient for judging whether the bar material and the fixture will slip during the test of the basalt fiber composite bar, thereby avoiding the phenomenon of crushing and slipping at the clamping point during the test.
[0021] The basalt fiber composite reinforcement tensile test fixture designed by the utility model clamps the basalt fiber composite reinforcement through a variable diameter thread, thereby preventing the test piece from being crushed when clamped by the jaws of the tensile testing machine; threaded steel is arranged on the upper part of the fixed frame, thereby effectively preventing the clamping part from slipping and causing inaccurate test data; the fixture can be reused repeatedly, thereby greatly reducing the inconvenience of repeatedly making the clamping device during the tensile test of the basalt fiber composite reinforcement, thereby improving the experimental efficiency and saving related materials.
[0022] Furthermore, a rubber liner is provided in the inner sleeve and bonded to the inside of the inner sleeve, thereby increasing the friction between the fiber reinforcement and the inner sleeve and protecting the fiber reinforcement from being crushed by concentrated stress.
[0023] Furthermore, the slip detection device includes a signal transmitter, a signal receiver and a slip indicator light. One side is the signal transmitter and the other side is the signal receiving device. When the reinforcement does not slip, the reinforcement just creates an obstruction. When slippage occurs, the signal receiver can receive a signal, thereby triggering a reinforcement slip prompt. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 is a schematic diagram of the structure of the inner sleeve;
[0025] Figure 2 Schematic diagram of the structure of the outer sleeve;
[0026] Figure 3 is a schematic diagram of the structure of the fixing frame;
[0027] Figure 4 It is a schematic diagram of the structure in which the basalt fiber composite bar to be tested is installed in the inner sleeve 1;
[0028] Figure 5 It is a schematic diagram of the structure after the inner sleeve and the outer sleeve are tightened;
[0029] Figure 6 The utility model is a structural schematic diagram of a basalt fiber composite reinforcement tensile test fixture after installation.
[0030] In the figure, 1. inner sleeve; 2. outer sleeve; 3. reducing thread; 4. threaded protrusion; 5. rubber gasket; 6. internal thread; 7. head; 8. tail; 9. deformed opening; 10. fixing frame; 11. threaded steel bar; 12. connecting pipe; 13. signal transmitter; 14. signal receiver; 15. slip indicator light. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model, that is, the embodiments described are only part of the embodiments of the utility model, not all of the embodiments.
[0032] The components described and shown in the drawings and embodiments of the present invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present invention.
[0033] It should be noted that the terms "comprises", "includes" or any other variants are intended to cover non-exclusive inclusion, so that a process, element, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to the process, element, method, article or device. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for the purpose of better describing the utility model, rather than requiring the devices, components or equipment shown to have this specific orientation, and therefore cannot be understood as limitations on the utility model.
[0034] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.
[0035] like Figure 1-6 As shown, the utility model provides a basalt fiber composite bar tensile test fixture, comprising: an inner sleeve 1, an outer sleeve 2 and a fixing frame 10. The basalt fiber composite bar to be tested is installed in the inner sleeve 1, the outer sleeve 2 is screwed on the outside of the inner sleeve 1, and one end of the outer sleeve 2 extends into the lower part of the fixing frame 10.
[0036] like Figure 1 As shown, the length of the inner sleeve 1 is at least two-thirds of the length of the basalt fiber composite bar to be tested, the inner diameter of the inner sleeve 1 needs to be roughly the same as the outer diameter of the basalt fiber composite bar, and the difference between the inner diameter of the inner sleeve 1 and the outer diameter of the basalt fiber composite bar needs to be within 0.5 mm.
[0037] More preferably, a 0.5 mm thick rubber liner 5 is provided inside the inner sleeve 1 , and the rubber liner 5 is bonded inside the inner sleeve 1 to increase the friction between the basalt fiber composite bar and the inner sleeve 1 , while protecting the basalt fiber composite bar from being crushed by concentrated stress.
[0038] A reducing thread 3 is prefabricated on the outside of the inner sleeve 1. The diameter of the head 7 of the reducing thread 3 is smaller than the tail 8. A deformation opening 9 is designed at the tail 8 of the reducing thread 3. The opening length of the deformation opening 9 is two-thirds of the length of the inner sleeve 1, and the opening can be deformed. The outer radial opening part of the reducing thread 3 needs to be gradually increased, and the difference in outer diameter between the head 7 of the reducing thread 3 and the tail 8 of the reducing thread 3 needs to be at least 2 mm. Under the action of the outer sleeve 2, it can be deformed so as to engage with the basalt fiber composite reinforcement.
[0039] like Figure 2 As shown, the inner wall of the outer sleeve 2 is prefabricated with an internal thread 6, which needs to engage with the thinnest part of the head 7 of the reducing thread 3. The length of the outer sleeve 2 is roughly the same as that of the inner sleeve 1. The diameters of the internal threads 6 of the outer sleeve 2 are the same. The reducing thread 3 of the inner sleeve 1 can force the inner sleeve 1 to deform and engage with the basalt fiber composite reinforcement.
[0040] Generally, the inner sleeve 1 and the outer sleeve 2 are metal sleeves made of 304 stainless steel.
[0041] like Figure 3 As shown, the fixing frame 10 is a rectangular three-dimensional frame, and a threaded steel bar 11 is arranged on the top of the fixing frame 10, which can be conveniently clamped by the tensile testing machine. A signal transmitter 13, a signal receiver 14 and a slip indicator light 15 are arranged in the middle. The signal transmitter 13 and the signal receiver 14 are arranged opposite to each other. When the reinforcement material does not slip, the reinforcement material just generates an obstruction. When slippage occurs, the signal receiver 14 can receive a signal, thereby triggering a reinforcement material slippage prompt, and the slip indicator light 15 is on, which can effectively monitor whether the basalt fiber composite reinforcement slips during the test.
[0042] The signal transmitter 13 has two parts: a battery box, a switch and a laser transmitter. Considering the low power consumption of laser emission and reception, two No. 5 batteries are used to power the laser transmitter. The battery box is integrated in the signal transmitter 13, and the switch directly controls the power supply of the battery box. The laser transmitter emits a visible red semiconductor laser with a wavelength of 655nm. The signal receiver 14 has a small laser signal sensor built in. When receiving the laser signal, the small laser signal sensor sends an electrical signal to light up the sliding indicator light 15. The signal transmitter 13, the signal receiver 14 and the sliding indicator light 15 are all powered by the battery box built in the signal transmitter 13, and the power supply line is hidden at the bottom of the flat plate under the fixing frame 10 to avoid damage during use.
[0043] A threaded hole is prefabricated at the bottom of the fixing frame 10 , and a connecting pipe 12 is connected below the threaded hole. The outer sleeve 2 is screwed into the connecting pipe 12 . The connecting pipe 12 is provided to facilitate fixing the outer sleeve 2 on the fixing frame 10 .
[0044] As a further solution of the utility model, a threaded protrusion 4 is provided on the outside of the outer sleeve 2, and the inner wall of the connecting pipe 12 is prefabricated with threads to facilitate combination with the connecting pipe 12. The threaded protrusion 4 should be able to engage with the threaded hole and the thread of the inner wall of the connecting pipe 12.
[0045] As a further solution of the utility model, a limit device is provided inside the connecting tube 12 to prevent the outer sleeve 2 from being screwed in too deeply, thereby affecting the result of the slip detection.
[0046] The utility model is used for the basalt fiber composite reinforcement tensile test fixture, and the installation method during the test is specifically as follows:
[0047] Remove the outer sleeve 2, and insert the basalt fiber composite rib into the inner sleeve 1 with the corresponding diameter by rotation, and it should fit tightly with the rubber liner 5. Figure 4 As shown;
[0048] After insertion, screw the outer sleeve 2 into the thinnest part of the head 7 of the reducing thread 3 of the inner sleeve 1. To ensure the clamping effect, the screwing depth of the outer sleeve 2 should not be less than two-thirds of the total length of the inner sleeve 1. Figure 5 As shown;
[0049] When the fixation is completed, the outer sleeve 2 of the fixed basalt fiber composite bar can be screwed into the lower connecting pipe 12 of the fixing frame 10. The screwing depth should ensure that the protruding part of the basalt fiber composite bar head is flush with the upper edge of the signal transmitter 13 to obtain the most accurate slip detection, such as Figure 6 As shown. After fixing, the threaded steel 11 part should be clamped with the tensile testing machine for tensile testing. During the test, the slip monitoring device needs to be turned on in advance, and the slip indicator 15 is off when the fiber reinforcement is clamped normally and not stretched. If the slip indicator 15 is on, the test needs to be stopped and the reinforcement fixing method needs to be readjusted before continuing the test.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.
Claims
1. A basalt fiber composite reinforcement tensile test fixture, characterized in that: It comprises an inner sleeve (1), an outer sleeve (2) and a fixing frame (10); The outer portion of the inner sleeve (1) is prefabricated with a reducing thread (3), the diameter of the head portion (7) of the reducing thread (3) is smaller than the diameter of the tail portion (8), and a deformed opening (9) is prefabricated at the tail portion (8) of the reducing thread (3); the inner diameter of the inner sleeve (1) matches the basalt fiber composite reinforcement to be tested; The inner wall of the outer sleeve (2) is prefabricated with an internal thread (6), and the outer wall is prefabricated with a thread protrusion (4); the internal thread (6) is engaged with the thinnest part of the head (7) of the reducing thread (3); A threaded steel bar (11) is arranged on the top of the fixing frame (10), and a slip detection device is arranged in the middle thereof, which is used to detect whether the basalt fiber composite bar to be tested slips; When in use, the basalt fiber composite bar to be tested is inserted into the inner sleeve (1), the outer sleeve (2) is screwed onto the outside of the inner sleeve (1), and the outer sleeve (2) is screwed into the lower part of the fixing frame (10).
2. A basalt fiber composite reinforcement tensile test fixture according to claim 1, characterized in that: A rubber gasket (5) is arranged on the inner wall of the inner sleeve (1).
3. The basalt fiber composite reinforcement tensile test fixture according to claim 1, characterized in that: The fixing frame (10) is connected to a threaded hole at the bottom, a connecting pipe (12) is connected to the bottom of the threaded hole, the outer sleeve (2) is screwed into the connecting pipe (12), and the head of the basalt fiber composite bar to be tested is exposed from the threaded hole.
4. The basalt fiber composite reinforcement tensile test fixture according to claim 1, characterized in that: The length of the inner sleeve (1) is at least two thirds of the length of the basalt fiber composite bar to be tested.
5. The basalt fiber composite reinforcement tensile test fixture according to claim 1, characterized in that: The difference between the inner diameter of the inner sleeve (1) and the outer diameter of the basalt fiber composite bar to be tested is within 0.5 mm.
6. The basalt fiber composite reinforcement tensile test fixture according to claim 1, characterized in that: The opening length of the deformation opening (9) is two thirds of the length of the inner sleeve (1).
7. The basalt fiber composite reinforcement tensile test fixture according to claim 1, characterized in that: The difference in outer diameter between the head (7) of the reducing thread (3) and the tail (8) of the reducing thread (3) must be at least 2 mm.
8. The basalt fiber composite reinforcement tensile test fixture according to claim 1, characterized in that: A limiting device is provided at the lower part of the fixing frame (10) to prevent the outer sleeve (2) from being screwed in too deeply.
9. A basalt fiber composite reinforcement tensile test fixture according to any one of claims 1 to 8, characterized in that: The slip detection device comprises a signal transmitter (13), a signal receiver (14) and a slip indicator light (15); the signal transmitter (13) and the signal receiver (14) are arranged on both sides of the basalt fiber composite bar to be tested.