Four-point bending test device for engineering geopolymer composite sheet

Abstract

The utility model relates to a four-point bending test device for an engineering geopolymer composite sheet, which comprises a base, a side plate is arranged on the rear side of the top of the base, a sliding seat is mounted on the front side of the side plate in a sliding manner, a pressurizing piece is arranged at the bottom of the sliding seat, a supporting assembly is arranged on the top of the base, and the supporting assembly is connected with the sliding seat. A limiting mechanism is arranged on the right side of the supporting assembly. The limiting mechanism comprises a mounting box, the mounting box is fixedly mounted on the right side of the supporting assembly, an arc-shaped clamping plate is movably mounted in the mounting box, and an outer sleeve rod is fixedly mounted at the bottom of the arc-shaped clamping plate. According to the four-point bending test device for the engineering geopolymer composite material sheet, by arranging the limiting mechanism, after the distance between the two supports is adjusted by the two-way threaded rod, an arc-shaped clamping plate can be pushed by utilizing the elastic force of a spring to be clamped into a tooth groove of a circular gear, and the position of the two-way threaded rod is effectively locked.

Description

Technical Field

[0001] This utility model relates to the field of four-point bending test technology, specifically a four-point bending test device for engineered polymer composite thin plates. Background Technology

[0002] Engineered geopolymer composite sheet typically refers to a lightweight, high-strength, multifunctional sheet made with geopolymer as the matrix and reinforced with materials such as fibers, particles, or fillers. The four-point bending stress loading method is the most commonly used stress loading method among many methods, which allows the specimen to be uniformly stressed over a large area. To improve the performance of the four-point bending test device used in high-speed tensile testing machines, the four-point bending test can accurately evaluate the bending strength and modulus of engineered geopolymer composite sheet and determine whether its mechanical properties meet the requirements of specific applications.

[0003] A search revealed, for example, a utility model patent with Chinese patent publication number CN213544204U, which discloses a four-point bending test device for a high-speed tensile testing machine. This device allows for easy adjustment of the distance between two sets of L-shaped supports according to the size of the specimen, making it convenient to support specimens of different sizes. It is flexible in use, has a simple structure, is easy to operate, and allows for convenient replacement of the four-point bending loading head and the three-point bending loading head.

[0004] However, the bending test device in the above-mentioned utility model patent has a potential problem: the distance between the two L-shaped supports is adjusted by the screw to meet the needs of specimens of different lengths, but there is no structure for locking the screw. When the loading head applies force downward to the specimen, it may cause the two L-shaped supports to shift. Therefore, a four-point bending test device for engineering polymer composite thin plates is proposed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a four-point bending test device for thin polymer composite plates in engineering applications. It has advantages such as locking the positions of the two L-shaped supports, and solves the problem that the two L-shaped supports may shift when the loading head applies force downwards to the sample due to the lack of a locking structure for the threaded rod.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a four-point bending test device for engineering polymer composite thin plates, comprising a base, a side plate provided on the top rear side of the base, a slide block slidably mounted on the front side of the side plate, a pressure member provided at the bottom of the slide block, a support assembly provided on the top of the base, and a limit mechanism provided on the right side of the support assembly;

[0007] The limiting mechanism includes a mounting box. The mounting box is fixedly installed on the right side of the support assembly. An arc-shaped clamping plate is movably installed inside the mounting box. An outer sleeve rod is fixedly installed at the bottom of the arc-shaped clamping plate. An inner support rod located inside the outer sleeve rod is fixedly installed on the inner bottom wall of the mounting box. A spring sleeved on the outer surface of the inner support rod is fixedly installed between the inner bottom wall of the mounting box and the bottom of the outer sleeve rod.

[0008] Furthermore, the support assembly includes a housing, the top of the base is fixedly mounted on the housing, a bidirectional threaded rod is rotatably mounted inside the housing, two threaded blocks are threadedly connected to the outer surface of the bidirectional threaded rod, and a deflection meter is provided on the top of the housing.

[0009] Furthermore, a limiting block is fixedly installed at the bottom of each of the two threaded blocks, a limiting groove is provided on the inner bottom wall of the housing located on the outer surface of the two limiting blocks, and a support is fixedly installed at the top of each of the two threaded blocks.

[0010] Furthermore, one end of the bidirectional threaded rod is rotatably mounted to the left inner wall of the housing, and the other end of the bidirectional threaded rod passes through the mounting box and is fixedly mounted with a turntable.

[0011] Furthermore, a circular gear located inside the mounting box is fixedly installed on the outer surface of the bidirectional threaded rod, and the protruding teeth of the arc-shaped clamping plate are adapted to the tooth groove of the circular gear.

[0012] Furthermore, the outer sleeve has a sliding cavity inside that matches the inner support rod, a pressure rod is fixedly installed on the right side of the outer sleeve, and an opening is provided on the right side of the mounting box on the outer surface of the pressure rod.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0014] This four-point bending test device for engineered polymer composite thin plates, by setting a limiting mechanism, can effectively lock the position of the bidirectional threaded rod by using the elastic force of the spring to push the arc-shaped clamping plate into the tooth groove of the circular gear after the distance between the two supports is adjusted by the bidirectional threaded rod. This prevents the two supports from being displaced due to pressure during loading, thereby improving the stability and accuracy of the test. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a partial three-dimensional structural diagram of the present utility model;

[0017] Figure 3 This is a cross-sectional view of the housing and mounting box of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the circular gear and arc-shaped clamping plate of this utility model.

[0019] In the diagram: 1. Base; 2. Side plate; 3. Slide; 4. Pressure component; 5. Support assembly; 501. Housing; 502. Bidirectional threaded rod; 503. Threaded block; 504. Limiting block; 505. Limiting groove; 506. Support; 6. Limiting mechanism; 601. Mounting box; 602. Circular gear; 603. Arc-shaped clamping plate; 604. Outer rod; 605. Inner support rod; 606. Spring; 607. Pressure rod; 7. Deflection meter. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 The four-point bending test device for engineering polymer composite sheet in this embodiment includes a base 1, a side plate 2 is provided on the top rear side of the base 1, a slide block 3 is slidably installed on the front side of the side plate 2, a pressure member 4 is provided at the bottom of the slide block 3, a support assembly 5 is provided on the top of the base 1, and a limit mechanism 6 is provided on the right side of the support assembly 5.

[0022] The side plate 2 is equipped with a drive mechanism, which is not shown in the figure. Its function is to drive the slide 3 to slide up and down on the front side of the side plate 2, thereby driving the pressure member 4 to apply pressure to the thin plate specimen. The deflection meter 7 has a magnetic base that is easy to install, and a single-arm measuring device with a spherical contact tip. During the test, the measuring arm of the deflection meter 7 will contact the sample surface and move as the sample bends and deforms. This movement will be converted into mechanical or electrical signals inside the deflection meter 7, so that the deformation of the sample can be accurately recorded and displayed.

[0023] The support assembly 5 includes a housing 501, a bidirectional threaded rod 502, two threaded blocks 503, two limiting blocks 504, a limiting groove 505, and two supports 506. The thin plate is placed between the tops of the two supports 506. Utilizing the engagement between the bidirectional threaded rod 502 and the two threaded blocks 503, and the sliding engagement between the two limiting blocks 504 and the limiting groove 505, when the bidirectional threaded rod 502 is rotated by the turntable, the two supports 506 can be moved in opposite or opposite directions by the two limiting blocks 504. Thus, the two supports 506 can be adjusted to a suitable distance according to the different lengths of the sample.

[0024] The limiting mechanism 6 includes a mounting box 601. The mounting box 601 is fixedly installed on the right side of the support component 5. An arc-shaped clamping plate 603 is movably installed inside the mounting box 601. An outer sleeve rod 604 is fixedly installed at the bottom of the arc-shaped clamping plate 603. An inner support rod 605 located inside the outer sleeve rod 604 is fixedly installed on the inner bottom wall of the mounting box 601. A spring 606 sleeved on the outer surface of the inner support rod 605 is fixedly installed between the inner bottom wall of the mounting box 601 and the bottom of the outer sleeve rod 604.

[0025] The extension and retraction of the spring 606 allows the arc-shaped clamping plate 603 to move up and down. Under the action of the circular gear 602 and the arc-shaped clamping plate 603, when the arc-shaped clamping plate 603 is locked in the tooth groove of the circular gear 602, the rotation of the circular gear 602 is limited, thereby limiting the bidirectional threaded rod 502. This ensures that the two supports 506 remain in the adjusted position without displacement. When the arc-shaped clamping plate 603 moves down, it releases the limitation on the circular gear 602, allowing the positions of the two supports 506 in the support assembly 5 to be adjusted smoothly.

[0026] By setting an outer sleeve rod 604 and opening a sliding cavity inside the outer sleeve rod 604 that matches the inner support rod 605, the arc-shaped clamping plate 603 can move up and down stably. By opening an opening on the right side of the mounting box 601, space is provided for the up and down movement of the pressure rod 607.

[0027] During implementation, the following method is followed: First, adjust the distance between the two supports 506 in the support assembly 5 according to the length of the sample. Rotate the bidirectional threaded rod 502 by turning the turntable. The bidirectional threaded rod 502 drives the two threaded blocks 503 to slide in opposite directions in the limiting groove 505 through the two limiting blocks 504 at their bottom, so that the two supports 506 are moved to the appropriate position. Place the engineered polymer composite sheet between the tops of the two supports 506. At this time, the spring 606 in the limiting mechanism 6 is in a compressed state. When the pressure rod 607 is released, the spring 606 expands and pushes the outer rod 604 to slide upward on the surface of the inner support rod 605. The inner support rod 605 drives the arc-shaped clamping plate 603 to lock in the groove of the circular gear 602, thus completing the limiting of the support assembly 5. Finally, start the drive mechanism to make the slide 3 drive the pressure member 4 to move downward, apply bending force to the sample, observe and record the deformation displayed by the deflection meter 7, as well as other relevant parameters of the sample during the bending process.

[0028] In summary, this four-point bending test device for engineered polymer composite thin plates, by setting a limiting mechanism 6, can effectively lock the position of the bidirectional threaded rod 502 after the distance between the two supports 506 is adjusted by the bidirectional threaded rod 502, and then use the elastic force of the spring 606 to push the arc-shaped clamping plate 603 into the tooth groove of the circular gear 602. This prevents the two supports 506 from shifting due to pressure during loading, thereby improving the stability and accuracy of the test.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A four-point bending test apparatus for engineered polymer composite thin plates, comprising a base (1), characterized in that: The base (1) has a side plate (2) on the top rear side, a slide block (3) is slidably installed on the front side of the side plate (2), a pressure member (4) is provided at the bottom of the slide block (3), a support component (5) is provided on the top of the base (1), and a limit mechanism (6) is provided on the right side of the support component (5). The limiting mechanism (6) includes a mounting box (601). The mounting box (601) is fixedly installed on the right side of the support component (5). An arc-shaped clamping plate (603) is movably installed inside the mounting box (601). An outer sleeve rod (604) is fixedly installed at the bottom of the arc-shaped clamping plate (603). An inner support rod (605) located inside the outer sleeve rod (604) is fixedly installed on the inner bottom wall of the mounting box (601). A spring (606) sleeved on the outer surface of the inner support rod (605) is fixedly installed between the inner bottom wall of the mounting box (601) and the bottom of the outer sleeve rod (604).

2. The four-point bending test apparatus for engineered polymer composite thin plates according to claim 1, characterized in that: The support assembly (5) includes a housing (501), the housing (501) is fixedly installed on the top of the base (1), a bidirectional threaded rod (502) is rotatably installed inside the housing (501), two threaded blocks (503) are threadedly connected to the outer surface of the bidirectional threaded rod (502), and a deflection meter (7) is provided on the top of the housing (501).

3. The four-point bending test apparatus for engineered polymer composite thin plates according to claim 2, characterized in that: Limiting blocks (504) are fixedly installed at the bottom of both threaded blocks (503), and limiting grooves (505) located on the outer surface of the two limiting blocks (504) are provided on the inner bottom wall of the housing (501). Supports (506) are fixedly installed at the top of both threaded blocks (503).

4. The four-point bending test apparatus for engineered polymer composite thin plates according to claim 2, characterized in that: One end of the bidirectional threaded rod (502) is rotatably mounted to the left inner wall of the housing (501), and the other end of the bidirectional threaded rod (502) passes through the mounting box (601) and is fixedly mounted with a turntable.

5. A four-point bending test apparatus for engineered polymer composite thin plates according to claim 4, characterized in that: The outer surface of the bidirectional threaded rod (502) is fixedly mounted with a circular gear (602) located inside the mounting box (601), and the protruding teeth of the arc-shaped clamping plate (603) are adapted to the tooth groove of the circular gear (602).

6. The four-point bending test apparatus for engineered polymer composite thin plates according to claim 1, characterized in that: The outer sleeve rod (604) has a sliding cavity inside that is compatible with the inner support rod (605). A pressure rod (607) is fixedly installed on the right side of the outer sleeve rod (604). An opening is provided on the right side of the mounting box (601) on the outer surface of the pressure rod (607).

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