Multi-angle single fiber drawing test piece forming device

Abstract

The utility model relates to a multi-angle single fiber drawing test piece forming device, which belongs to the field of mould manufacturing and comprises a bottom plate, a side plate A, a side plate B, a side plate C and a side plate D are fixedly connected onto the bottom plate and form a rectangular mould, and the rectangular mould and the bottom plate jointly contain cement-based materials. A fiber clamping device A capable of sliding along the side plate A is arranged on the outer side of the side plate A, a limiting fixing screw is arranged at the top of the fiber clamping device A, a long-strip-shaped cavity is formed in the side plate A in the length direction, and it is guaranteed that fibers can penetrate through the side plate A to be clamped by the fiber clamping device A; a fiber clamp holder B is fixedly arranged in the middle of the outer side of the side plate B, and a circular through hole is formed in the middle of the side plate B, so that the fiber can penetrate through the side plate B to be clamped by the fiber clamp holder B. According to the utility model, the embedding angle of the fiber in the cement-based material can be freely adjusted.

Description

Technical Field

[0001] The utility model relates to a multi-angle single fiber drawing test piece forming device, belonging to the technical field of mold manufacturing. Background Art

[0002] Engineered cementitious composites (ECC) are high-ductility composite materials designed based on the principles of fracture mechanics and micromechanics. They produce multiple stable and fine cracks under tensile loads, have strain-hardening properties, high toughness, and high energy absorption capacity, and can effectively solve the problems of ordinary concrete materials such as high brittleness and easy cracking.

[0003] The multi-crack cracking characteristics and strain hardening performance of engineering cement-based composite materials depend on the bridging ability of fibers between cracks, and are closely related to factors such as the bridging strength of fibers and the bonding strength of the fiber-matrix interface. The interfacial performance of fibers and matrices is mainly evaluated through single fiber pull-out tests. Since fibers are randomly distributed in the matrix of cement-based materials, it is not enough to conduct a single fiber pull-out test at a vertical angle. It is often necessary to conduct multi-angle fiber pull-out tests to study the influence of fibers on mechanical properties. At present, single fiber pull-out specimen molding devices can often only prepare pull-out specimens at vertical angles or fixed angles. Therefore, it is very necessary to develop a molding device that can easily and quickly prepare single fiber pull-out specimens at multiple angles. Summary of the invention

[0004] In view of the deficiencies of the prior art, the utility model provides a multi-angle single fiber drawing specimen forming device, which can freely adjust the embedding angle of the fiber in the cement-based material.

[0005] The utility model adopts the following technical solutions:

[0006] A multi-angle single fiber drawing specimen forming device comprises a bottom plate, to which side plates A, B, C and D are fixedly connected, side plates A and B are arranged along the length direction of the bottom plate, have the same length and are parallel to each other; side plates C and D are arranged along the width direction of the bottom plate, have the same length and are parallel to each other; side plates A, B, C and D form a rectangular mold, and together with the bottom plate contain cement-based materials;

[0007] A fiber clamp A that can slide along the side panel A is arranged on the outer side of the side panel A, and a limit fixing screw is arranged on the top of the fiber clamp A. When the fiber clamp A slides to the specified position, the limit fixing screw can be used to fix the fiber clamp A to the side panel A; a long strip-shaped cavity is arranged on the side panel A along the length direction to ensure that the fiber can pass through the side panel A and be clamped by the fiber clamp A; a fiber clamp B is fixedly arranged in the middle of the outer side of the side panel B, and a circular through hole is arranged in the middle of the side panel B to ensure that the fiber can pass through the side panel B and be clamped by the fiber clamp B.

[0008] The utility model adopts a freely slidable fiber clamp A to fix the fiber, and the embedding angle of the fiber in the cement-based material can be freely adjusted; after the fiber clamp A slides to the specified scale, the fiber clamp A and the side plate A can be fixed by a limit fixing screw to achieve the fixation of the fiber embedding angle; the utility model realizes the efficient and convenient preparation of fiber drawing specimens with any angle of 0°-60°, and the fiber embedding angle of the prepared specimen is highly accurate.

[0009] Preferably, the bottom plate is provided with a plurality of through holes, and the bottoms of the side plates A, B, C and D are all provided with threaded holes, and the through holes and the threaded holes are connected by bolts. The bottom plate is connected with the side plates A, B, C and D by bolts, and can be disassembled during demoulding, so as to minimize the damage to the fiber drawing specimen during the demoulding process.

[0010] Preferably, the fiber holder A is provided with scale lines, and the upper surface of the side plate A is provided with an angled scale, which is used to visualize the angle between the length direction of the fiber and the width direction of the bottom plate. The angled scale on the side plate A makes the embedding angle of the fiber clearly visible, so that the fiber has a more precise embedding angle.

[0011] Preferably, the length of the side panel A is greater than 3.5 times the length of the side panel C, so that the maximum fiber embedding angle reaches more than 60°.

[0012] Preferably, the range of the scale is 60°-0°-60°, and the scale interval of the scale is 5°.

[0013] Preferably, the side plate A is provided with a sliding rail along the length direction, and the fiber holder A is provided with a slider matched with the sliding rail. The slider can slide freely on the sliding rail, thereby adjusting the fiber embedding angle.

[0014] The working process of the utility model is:

[0015] (1) The utility model first uses bolts to connect the bottom plate with the side plates A, B, C, and D to form a rectangular space for accommodating the cement-based material matrix. In order to facilitate the removal of the cement-based material matrix after it is formed, a release agent, vaseline, lubricating oil, etc. are applied inside the rectangular space.

[0016] (2) Pass one end of the single fiber to be pulled through the circular through hole in the side plate B and use the fiber clamp B to fix the fiber.

[0017] (3) Slide the fiber holder A to the required angle. After the scale line is aligned with the corresponding scale on the scale, use the limit screw to firmly fix the fiber holder to the A side plate A.

[0018] (4) Pass the other end of the single fiber to be pulled through the long strip cavity in the side plate A, and then fix the fiber on the fiber holder A to straighten the single fiber.

[0019] (5) Slowly pour the mixed cement-based material into the rectangular mold, smooth the surface, and cover it with plastic film for curing. When the cement-based material matrix has a large fluidity, you can use tape to fill the excess gaps in the long strip cavity in advance to prevent the cement-based material from flowing out.

[0020] (6) After the specimen is cured to the demolding age, first release the fibers on the fiber holder A and the fiber holder B, then remove the bolts in the bottom plate, and finally slowly remove the specimen from the side plates A, B, C, and D.

[0021] It is worth noting that the multi-angle in the present invention means that the preparation of a single fiber pull-out specimen at a certain angle can be quickly achieved by adjusting the position of the fiber holder A. If you want to use the device to prepare multiple fibers with different pull-out angles at the same time, you can add several fiber holders A, different fiber holders A fix fibers at different angles, and then the other ends of the fibers are also fixed in the fiber holder B, and then cast.

[0022] Anything not described in detail in the present invention may be accomplished using existing technologies.

[0023] The beneficial effects of the utility model are:

[0024] The utility model can efficiently and conveniently prepare fiber drawing specimens with any angle of 0°-60°, and the fiber embedding angle of the prepared specimens is accurate. The specimen forming device adopts a freely slidable fiber clamp A to fix the fiber, and can freely adjust the embedding angle of the fiber in the matrix; the upper surface of the side panel A of the specimen forming device of the utility model is provided with an angled scale, so that the embedding angle of the fiber is clearly visible; after the fiber clamp A slides to the specified scale, the fiber clamp A can be fixed to the side panel A by the limit fixing screw to achieve the fixation of the fiber embedding angle; the bottom plate of the utility model is connected with the side panels A, B, C and D by bolts, and can be disassembled during demoulding, so as to avoid damage to the fiber drawing specimen during demoulding to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a stereoscopic diagram of a multi-angle single fiber drawing specimen forming device at a certain angle in the utility model;

[0026] Figure 2 A three-dimensional diagram of a multi-angle single fiber drawing specimen forming device from another angle in the utility model;

[0027] Figure 3 It is a schematic diagram of the structure after the bottom plate is separated;

[0028] Figure 4 is a structural schematic diagram of a fiber clamp B in a certain embodiment;

[0029] In the figure, 1-bottom plate, 2-side plate A, 3-side plate B, 4-side plate C, 5-side plate D, 6-fiber clamp A, 7-fiber clamp B, 8-scale, 9-limit fixing screw, 10-through hole, 11-threaded hole, 12-bolt, 13-long strip cavity, 14-sliding guide rail, 15-scale line, 16-circular through hole, 17-rotating body, 18-limit block, 19-bottom of the main body. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, they will be described in detail with reference to the accompanying drawings and specific embodiments, but are not limited to these. Anything not fully described in the utility model shall be based on conventional techniques in the art.

[0031] Example 1

[0032] A multi-angle single fiber drawing specimen forming device, such as Figure 1 , Figure 2 As shown, it includes a bottom plate 1, and the bottom plate 1 is fixedly connected with side plates A 2, B 3, C 4 and D 5. Side plates A 2 and B 3 are arranged along the length direction of the bottom plate 1, have the same length and are parallel to each other; side plates C 4 and D 5 are arranged along the width direction of the bottom plate, have the same length and are parallel to each other; side plates A, B, C and D form a rectangular mold, and together with the bottom plate 1 contain cement-based materials;

[0033] A fiber clamp A6 capable of sliding along the side panel A is arranged on the outer side of the side panel A2, and a limit fixing screw 9 is arranged on the top of the fiber clamp A6. When the fiber clamp A6 slides to the specified position, the limit fixing screw 9 can be used to fix the fiber clamp A6 to the side panel A2; a long strip-shaped cavity 13 is arranged on the side panel A2 along the length direction to ensure that the fiber can pass through the side panel A2 and be clamped by the fiber clamp A6; a fiber clamp B7 is fixedly arranged in the middle of the outer side of the side panel B3, and a circular through hole 16 is arranged in the middle of the side panel B3 to ensure that the fiber can pass through the side panel B3 and be clamped by the fiber clamp B7.

[0034] The utility model adopts a freely slidable fiber clamp A6 to fix the fiber, and the embedding angle of the fiber in the cement-based material can be freely adjusted; after the fiber clamp A6 slides to the specified scale, the fiber clamp A6 can be fixed to the side plate A2 by using the limit fixing screw 9 to achieve the fixation of the fiber embedding angle; the utility model realizes the efficient and convenient preparation of fiber drawing specimens with any angle of 0°-60°, and the fiber embedding angle of the prepared specimen is highly accurate.

[0035] Example 2

[0036] A multi-angle single fiber drawing specimen forming device, the structure of which is as shown in Example 1, except that Figure 3 As shown, the bottom plate 1 is provided with a plurality of through holes 10, and the bottoms of the side plates A2, B3, C4 and D5 are all provided with threaded holes 11, and the through holes 10 and the threaded holes 11 are connected by bolts 12. The bottom plate 1 is connected with the side plates A, B, C and D5 by bolts, and can be disassembled during demoulding to minimize damage to the fiber drawing specimen during demoulding.

[0037] Example 3

[0038] A multi-angle single fiber drawing specimen forming device, the structure is as shown in Example 2, except that the fiber holder A 6 is provided with a scale line 15, which is convenient for positioning with a scale, and the upper surface of the side plate A 2 is provided with an angled scale 8, which is used to visualize the angle between the fiber length direction and the bottom plate width direction. The angled scale on the side plate A makes the fiber embedding angle clearly visible, so that the fiber has a more accurate embedding angle.

[0039] Example 4

[0040] A multi-angle single fiber drawing specimen forming device has a structure as shown in Example 3, except that the length of the side plate A2 is greater than 3.5 times the length of the side plate C4, so that the maximum fiber embedding angle reaches more than 60°.

[0041] The scale range is 60°-0°-60°, and the scale interval is 5°.

[0042] Example 5

[0043] A multi-angle single fiber drawing specimen forming device, the structure is as shown in Example 4, the difference is that the side plate A2 is provided with a sliding guide 14 along the length direction, and the fiber clamp A6 is provided with a slider that cooperates with the sliding guide 14. The slider can slide freely on the sliding guide to adjust the fiber embedding angle.

[0044] Example 6

[0045] A multi-angle single fiber drawing specimen forming device, the structure of which is as shown in Example 5, except that both the fiber clamp A and the fiber clamp B can be conventional clamps, such as Figure 4 The figure shows a schematic diagram of the structure of one type of fiber clamp B, which includes a main body, which is in a "[" shape, with a limit block 18 arranged in the middle of the main body, through holes arranged on the upper part of the main body and the limit block, and a rotating body 17 passing through the through hole. When clamping, the fiber passes through the gap between the bottom 19 of the main body and the limit block, and the rotating body 17 moves downward to the bottom of the main body and rotates, clamping the fiber between the limit block 18 and the bottom 19 of the main body.

[0046] The fiber clamp A has a similar structure to the fiber clamp B, except that the upper part of the main body of the fiber clamp A is further provided with a limit fixing screw 9, a scale line 15 and a slider.

[0047] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-angle single fiber drawing specimen forming device, characterized in that: It includes a bottom plate, on which side plates A, B, C and D are fixedly connected, side plates A and B are arranged along the length direction of the bottom plate, have the same length and are parallel to each other; side plates C and D are arranged along the width direction of the bottom plate, have the same length and are parallel to each other; side plates A, B, C and D form a rectangular mold, and together with the bottom plate contain cement-based materials; A fiber clamp A capable of sliding along the side panel A is arranged on the outer side of the side panel A, a limit fixing screw is arranged on the top of the fiber clamp A, and a long strip cavity is arranged on the side panel A along the length direction to ensure that the fiber can pass through the side panel A and be clamped by the fiber clamp A; a fiber clamp B is fixedly arranged in the middle of the outer side of the side panel B, and a circular through hole is arranged in the middle of the side panel B to ensure that the fiber can pass through the side panel B and be clamped by the fiber clamp B.

2. The multi-angle single fiber drawing specimen forming device according to claim 1 is characterized in that: The bottom plate is provided with a plurality of through holes, and the bottoms of the side plates A, B, C and D are all provided with threaded holes, and the through holes and the threaded holes are connected by bolts.

3. The multi-angle single fiber drawing specimen forming device according to claim 2 is characterized in that: The fiber clamp A is provided with scale lines, and the upper surface of the side plate A is provided with an angled scale for visually indicating the angle between the fiber length direction and the bottom plate width direction.

4. The multi-angle single fiber drawing specimen forming device according to claim 3 is characterized in that: The length of the side plate A is greater than 3.5 times the length of the side plate C, so that the maximum fiber embedding angle reaches more than 60°.

5. The multi-angle single fiber drawing specimen forming device according to claim 3 is characterized in that: The scale range is 60°-0°-60°, and the scale interval is 5°.

6. The multi-angle single fiber drawing specimen forming device according to claim 5 is characterized in that: The side plate A is provided with a sliding guide rail along the length direction, and the fiber clamp A is provided with a sliding block matched with the sliding guide rail.

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