Fibrous concrete pull-out test clamp
By designing a fiber concrete pull test fixture that uses an "8"-shaped specimen placement groove and a sensor, the specimen damage caused by clamping in the prior art is solved, and the accuracy and portability of the test results are improved.
Patent Information
- Application Number
- CN202422058622.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-23
AI Technical Summary
In the prior art, the drawing test fixture of fiber concrete is prone to damage the test pieces, affecting the mechanical properties and the accuracy of the test results.
A fiber concrete drawing test fixture was designed, and the test piece was fixed using an "8"-shaped specimen placement groove, combining the force-sensitive sensor and the displacement sensor, and connecting it through a removable target sheet to avoid damage caused by clamping.
It effectively avoids the damage of fiber concrete specimens, improves the measurement accuracy of mechanical properties, simplifies the installation process of the sensor, and is easy to carry.
Smart Images
Figure CN223037570U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of fiber concrete detection, and particularly relates to a fiber concrete pull-out test fixture. Background Technique
[0002] Fiber concrete refers to a general term for composite materials composed of fibers and cement-based materials (cement stone, mortar or concrete).
[0003] The main disadvantages of ordinary concrete are: low tensile strength, small ultimate elongation, and brittleness; adding fibers with high tensile strength, large ultimate elongation, and good alkali resistance can overcome these disadvantages. To study the tensile strength of fibers and the law of fiber pull-out failure in fiber concrete, the common method is the pull-out test of fiber concrete.
[0004] In the prior art, when clamping fiber concrete, generally the fixtures for clamping steel fibers or other pull-out test objects are used to fix the fiber concrete specimens in a clamping manner, which is very easy to damage the fiber concrete specimens, thereby affecting their mechanical properties, resulting in inaccurate pull-out test results, and affecting the subsequent tensile strength and fiber failure law.
[0005] Therefore, a fiber concrete pull-out test fixture is proposed to solve the above technical problems. Content of the Utility Model
[0006] The technical problem solved by the utility model lies in that in the prior art, when clamping fiber concrete, generally the fixtures for other pull-out test objects are used to fix the fiber concrete specimens in a clamping manner, which is easy to cause damage to the fiber concrete specimens and affect their mechanical properties.
[0007] To solve the above technical problems, the technical solution adopted by the utility model is as follows:
[0008] A fiber concrete pull-out test fixture, comprising:
[0009] A first connecting rod, provided with a connecting through hole, connected to one end of the first chuck; the other end of the first chuck is provided with a circular specimen placement groove;
[0010] A second chuck, one end of which is also provided with a circular specimen placement groove, and the other end is connected to one side of the second connecting rod; the ends of the first chuck and the second chuck with the specimen placement grooves are mutually abutted, and the two specimen placement grooves communicate to form an "8" shape;
[0011] A force-sensitive sensor, one end of which is connected to the other side of the second connecting rod, and the other end is connected to the third connecting rod, and the third connecting rod is also provided with a connecting through hole;
[0012] A displacement sensor is arranged on the second chuck, and a target piece is arranged on the first chuck.
[0013] Specifically, the target piece and the first chuck are detachably connected.
[0014] Furthermore, the detachable connection is specifically as follows: at the lower part of one end of the first chuck close to the second chuck, there is an outwardly protruding mounting table, and on the end face of the first chuck above the mounting table, there is a magnetic head for adsorbing the target piece.
[0015] Furthermore, the detachable connection is specifically as follows: on the top surface of one end of the first chuck close to the second chuck, there is a mounting groove with the same size as the target piece, and the inner wall of the mounting groove is provided with a rubber cushion layer, and the target piece is inserted into the mounting groove.
[0016] Specifically, the first chuck and the first connecting rod, and the force-sensitive sensor and the third connecting rod are both threadedly connected.
[0017] Specifically, the second connecting rod is a double-headed screw rod, and the second connecting rod is threadedly connected to both the second chuck and the force-sensitive sensor.
[0018] Compared with the prior art, the present utility model has the following advantages and beneficial effects: the overall structure of the present utility model is simple. The two test piece placement grooves in the shape of "8" are used to fix the two ends of the fiber concrete test piece respectively, thus avoiding the problem of damaging the fiber concrete test piece by clamping in the prior art; at the same time, the displacement sensor is directly fixed on the second chuck, and the target piece is detachably arranged as a target on the first chuck, which can also avoid the cumbersome operation of additionally setting sensors for the fixture in the existing pull-out test. In addition, the split structure between various parts is also convenient for carrying. Brief Description of the Drawings
[0019] Figure 1 It is a schematic structural diagram of the device of the present utility model.
[0020] Figure 2 It is a schematic cross-sectional structural diagram of the device of the present utility model.
[0021] The interpretations of the reference numerals in the figure are as follows: the first chuck - 1; the first connecting rod - 2; the connecting through hole - 3; the test piece placement groove - 4; the force-sensitive sensor - 5; the second connecting rod - 6; the third connecting rod - 7; the second chuck - 8; the displacement sensor - 9; the target piece - 10. Detailed Embodiment
[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model, so as to have a further understanding of the concept of the present utility model, the technical problems solved, the technical features constituting the technical solution, and the technical effects brought.
[0023] Such asFigures 1 to 2 As shown in the figure, a fiber concrete pull-out test fixture includes:
[0024] A first connecting rod 2, provided with a connecting through-hole 3, connected to one end of the first chuck 1; the other end of the first chuck 1 is provided with a circular specimen placement groove 4;
[0025] A second chuck 8, one end of which is also provided with a circular specimen placement groove 4, and the other end is connected to one side of a second connecting rod 6; the ends of the first chuck 1 and the second chuck 8 with the specimen placement grooves 4 are tightly abutted against each other, and the two specimen placement grooves 4 communicate to form an "8" shape;
[0026] A force-sensitive sensor 5, one end is connected to the other side of the second connecting rod 6, and the other end is connected to a third connecting rod 7, and the third connecting rod 7 is also provided with a connecting through-hole 3;
[0027] A displacement sensor 9 is arranged on the second chuck 8, and a target piece 10 is arranged on the first chuck 1.
[0028] In the present utility model, one end of the force-sensitive sensor 5 is connected to the second chuck 8 through the second connecting rod 6, and the other end is connected to any loading device through the third connecting rod 7 and the connecting through-hole 3 to provide a pull-out force. And a target piece 10 is fixed at the connection of the first chuck 1 near the second chuck 8. The displacement sensor 9 uses the target piece 10 as a target. When the loading device pulls the force-sensitive sensor 5 on one side of the second chuck 8, the pulling force is transmitted to the second chuck 8 through the second connecting rod 6. Since the first chuck 1 is fixedly installed on an external fixing frame or a fixed point through the connecting through-hole 3, the pulling force signal of the force-sensitive sensor 5 can accurately represent the stress condition of the specimen, and the distance change signal detected by the displacement sensor 9 between the target piece 10 and the displacement sensor 9 can accurately represent the anti-pull-out situation of the fiber concrete specimen when it is subjected to the pulling force of the force-sensitive sensor 5. The "8"-shaped specimen placement groove 4 can clearly observe the cracking condition of the concrete surface, the pulling-out condition of the fibers, and the fracture condition of the fibers. Thus, the purpose of collecting displacement and loading force data and observing the fiber failure mechanism in the pull-out experiment can be achieved through this device. In order to better ensure the stability of the fiber concrete specimen clamping, the first chuck 1 and the second chuck 8 of the device of the present utility model can also be placed in a square frame to act as a specimen mold.
[0029] As a preferred embodiment, the target piece 10 and the first chuck 1 are detachably connected.
[0030] In this embodiment, by setting the target piece 10 and the first chuck 1 to be detachably connected, damage to the target piece 10 during transportation and movement can be avoided.
[0031] As a preferred embodiment, the detachable connection is specifically as follows: at the lower part of one end of the first chuck 1 close to the second chuck 8, there is a protruding mounting platform, and on the end face of the first chuck 1 above the mounting platform, there is a magnetic suction head for adsorbing the target sheet 10.
[0032] In this embodiment, a specific method for installing the target sheet 10 is provided. By using the protruding mounting platform as the placement position of the target sheet 10 and using the magnetic suction head to adsorb the target sheet 10, it can ensure that the target sheet 10 is stably and firmly set between the first chuck 1 and the second chuck 8. When not in use, the target sheet 10 can also be conveniently removed from the first chuck 1.
[0033] As a preferred embodiment, the detachable connection is specifically as follows: on the top surface of one end of the first chuck 1 close to the second chuck 8, there is a mounting groove with the same size as the target sheet 10, and the inner wall of the mounting groove is provided with a rubber cushion layer, and the target sheet 10 is inserted into the mounting groove.
[0034] In this embodiment, another method for installing the target sheet 10 is provided. Among them, the mounting groove serves as the installation position of the target sheet 10, which facilitates the insertion and extraction of the target sheet 10. Setting the rubber cushion layer can ensure the stability of the target sheet 10 after it is inserted into the mounting groove, avoid the target sheet from shaking, and can also quickly extract the target sheet 10 from the mounting groove when not in use.
[0035] As a preferred embodiment, the connection between the first chuck 1 and the first connecting rod 2 and the connection between the force-sensitive sensor 5 and the third connecting rod 7 are both threaded connections.
[0036] In this embodiment, by setting the connection between the first chuck 1 and the first connecting rod 2 and the connection between the force-sensitive sensor 5 and the third connecting rod 7 as threaded connections, it is possible to quickly assemble each component on the premise of providing sufficient tensile strength, which is convenient for disassembly and later maintenance.
[0037] As a preferred embodiment, the second connecting rod 6 is a double-headed screw, and the connections between the second connecting rod 6 and the second chuck 8 and the force-sensitive sensor 5 are both threaded connections.
[0038] In this embodiment, by setting the second connecting rod 6 as a double-headed screw, the rapid installation between the force-sensitive sensor 5 and the second chuck 8 can be realized.
[0039] The "connection" and "fixation" mentioned in the description of the present utility model can be fixed connection, processing and forming, welding, or mechanical connection. The specific meanings of the above terms in the present utility model should be understood according to the specific situation.
[0040] In the description of the present utility model, terms such as "center", "upper", "lower", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying a specific orientation that the indicated device or element must have. Therefore, it should not be construed as a limitation to the present utility model.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.
Claims
1. A fiber concrete pull-out test fixture, characterized in that: include; A first connecting rod (2) is provided with a connecting through hole (3) and is connected to one end of the first clamp (1); the other end of the first clamp (1) is provided with a circular specimen placement groove (4); The second chuck (8) also has a circular specimen placement groove (4) at one end, and the other end is connected to one side of the second connecting rod (6); the ends of the first chuck (1) and the second chuck (8) with the specimen placement groove (4) are pressed against each other, and the two specimen placement grooves (4) are connected to form an "8" shape; A force-sensitive sensor (5), one end of which is connected to the other side of the second connecting rod (6), and the other end of which is connected to the third connecting rod (7), and the third connecting rod (7) is also provided with a connecting through hole (3); The displacement sensor (9) is arranged on the second clamp (8), and the target sheet (10) is arranged on the first clamp (1).
2. A fiber concrete pull-out test fixture as claimed in claim 1, characterized in that: The target sheet (10) and the first clamp (1) are detachably connected.
3. A fiber concrete pull-out test fixture as claimed in claim 2, characterized in that: The detachable connection is specifically as follows: a mounting platform protruding outward is provided at the lower part of the first clamp (1) close to one end of the second clamp (8), and a magnetic suction head is provided on the end surface of the first clamp (1) above the mounting platform, and the magnetic suction head is used to absorb the target sheet (10).
4. A fiber concrete pull-out test fixture as claimed in claim 2, characterized in that: The detachable connection is specifically as follows: a mounting groove having the same size as the target piece (10) is provided on the top surface of the first clamp (1) close to one end of the second clamp (8), a rubber cushion layer is provided on the inner wall of the mounting groove, and the target piece (10) is inserted into the mounting groove.
5. A fiber concrete pull-out test fixture as claimed in claim 1, characterized in that: The first clamp (1) and the first connecting rod (2), as well as the force sensitive sensor (5) and the third connecting rod (7) are all connected by threads.
6. A fiber concrete pull-out test fixture as claimed in claim 1, characterized in that: The second connecting rod (6) is a double-headed screw rod, and the second connecting rod (6) is threadedly connected to the second clamp (8) and the force sensitive sensor (5).