Basalt fiber reinforced resin matrix composite stretching preform preparation device

Abstract

A basalt fiber reinforced resin matrix composite stretching preform preparation device relates to a mold, and comprises two lower bases arranged in parallel, and the two lower bases are connected into a whole through a connecting rod; a lower groove for placing the end part of the BFRP tensile sample and the reinforcing sheet is formed in the lower base; the two lower bases are further connected with the upper cover plate in a fastened mode through fasteners, and the upper cover plate is provided with an upper groove used for containing the reinforcing piece at the position corresponding to the lower groove. The device can be used for integrally forming the BFRP tensile sample and the reinforcing pieces, manual marking and gluing are not needed for pasting operation, the requirement for the skill level of an operator is low, it can be guaranteed that all the reinforcing pieces are tightly attached to be fully and evenly stressed, it can also be guaranteed that the BFRP tensile sample is subjected to even and consistent tension, and the BFRP tensile sample and the reinforcing pieces are not prone to being damaged. The resin content uniformity and the fracture consistency are achieved, the reinforcing sheet can be prevented from falling off in the stress testing process, the accuracy of mechanical test data is guaranteed, and the device has the advantages of being simple in structure, easy and convenient to operate and the like and is easy to apply and popularize.

Description

Technical Field

[0001] The utility model relates to a mould, in particular to a preparation device for a basalt fiber reinforced resin-based composite material stretching preform. Background Art

[0002] Basalt fiber is often used as a reinforcing material and prepared into a resin matrix composite material with the characteristics of light weight, high strength and corrosion resistance. Among the various performance indicators of basalt fiber resin matrix composite material (BFRP), the mechanical properties and the size of the dispersion coefficient are the focus of attention. Objective and accurate testing of BFRP mechanical properties is a very important content in quality evaluation, which affects the design and use of BFRP.

[0003] At present, the preparation of BFRP tensile specimens is mainly divided into two steps. The first step is to manually or by equipment dip the basalt fiber multifilaments into glue, then wrap them around the sample preparation frame and put them into an oven or the equipment's own heating device for curing. The second step is to remove the already cured BFRP tensile specimens on the sample preparation frame, cut them into the required length, paste reinforcement sheets on both ends, and then put them into the oven for curing again. In the preparation process, the pasting of the reinforcement sheet of the specimen is an important step, which is used to protect the BFRP tensile specimen from unacceptable failure modes at the ends during the test, thereby improving the stability and reliability of the test data and results.

[0004] Usually, the reinforcement sheet is made of aluminum reinforcement sheet, stainless steel reinforcement sheet, glass fiber composite material or carbon fiber composite material, etc., and the adhesive is generally epoxy resin, polyurethane, acrylic acid, etc. Usually, the pasting of BFRP reinforcement sheets is carried out by manual marking and gluing, which requires a high level of skill from the operator, making it difficult to ensure the spacing and centering between the reinforcement sheets, making the upper and lower reinforcement sheets asymmetrical, causing uneven force on the reinforcement sheets. In addition, manual pasting can easily lead to insufficient fit between the reinforcement sheet and the BFRP tensile specimen, resulting in gaps, causing it to fall off during the test force process. In addition, manual pasting can easily cause the reinforcement sheet to slip, debond, etc., resulting in insufficient or increased gauge length, affecting the mechanical test data. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a basalt fiber reinforced resin-based composite material tensile preform preparation device to solve the shortcomings of the prior art, such as high requirements on the operator's skill level due to manual operation, easy to cause uneven force on the reinforcing sheet, insufficient fit between the reinforcing sheet and the BFRP tensile specimen, resulting in falling off during the test force, and easy to cause slippage and debonding of the reinforcing sheet.

[0006] The technical solution to solve the above technical problems is: a basalt fiber reinforced resin-based composite material tensile preform preparation device, comprising two lower bases arranged in parallel, the two lower bases are connected as a whole by a connecting rod; the two lower bases are respectively provided with lower grooves for placing the ends of the BFRP tensile specimens and the reinforcement plates; the two lower bases are also fastened to the upper cover plate by fasteners, and the upper cover plate is provided with an upper groove for accommodating the reinforcement plate at the position corresponding to the lower groove.

[0007] A further technical solution of the utility model is: the two lower bases are respectively the first lower base and the second lower base, and a threaded through hole is respectively provided at the left and right ends of the first lower base and the second lower base, and the threaded through holes relative to the first lower base and the second lower base have opposite rotation directions; both ends of the connecting rod each have an external thread with opposite rotation directions and matching with the threaded through hole, and the connecting rod is respectively connected to the first lower base and the second lower base through the external thread.

[0008] A further technical solution of the utility model is that a centering line is provided in the middle of the lower grooves of the two lower bases for centering the BFRP tensile specimens.

[0009] A further technical solution of the utility model is that the depth of the upper groove of the upper cover plate is half the depth of the lower groove of the lower base.

[0010] A further technical solution of the utility model is that the lower base and the upper cover are both made of aluminum alloy plates, and the connecting rod is made of stainless steel.

[0011] Due to the adoption of the above structure, the basalt fiber reinforced resin-based composite material stretching preform preparation device of the utility model has the following beneficial effects compared with the prior art:

[0012] 1. Low skill level requirements for operators

[0013] The utility model comprises two lower bases arranged in parallel, which are connected into one body by a connecting rod; the two lower bases are respectively provided with lower grooves for placing the ends of the BFRP tensile specimens and the reinforcing sheet; the two lower bases are also respectively fastened to the upper cover plate by fasteners, and the upper cover plate is provided with an upper groove for accommodating the reinforcing sheet at a position corresponding to the lower groove. When in use, the two lower bases are first connected into one body by a connecting rod, a demoulding agent is applied to the lower groove of the lower base and the upper groove of the upper cover plate, the reinforcing sheets are respectively placed in the lower grooves, and the surface of the reinforcing sheet is coated with epoxy resin adhesive, and the two ends of the BFRP tensile specimen that has not been cured by the dipped glue are respectively placed on the surface of the reinforcing sheet, and are centered by the centering engraved line of the lower groove; the upper cover plate is connected to the two lower bases by fastener bolts, and the reinforcing sheet and the BFRP tensile specimen are compacted by adjusting the tightening force of the bolts, and finally the device, the BFRP tensile specimen and the reinforcing sheet are put into an oven for curing, so as to obtain a BFRP tensile specimen with reinforcing sheets integrally formed at both ends. Therefore, the utility model can be used to integrally form the BFRP tensile test specimen and the reinforcement sheet without manual marking and gluing for pasting operations, thereby requiring a lower skill level of the operator.

[0014] 2. Make the reinforcement plate bear force evenly

[0015] The utility model can be used for integrally forming a BFRP tensile specimen and a reinforcing sheet, which can ensure that each reinforcing sheet is closely fitted and sufficiently evenly stressed, and can also ensure that the BFRP tensile specimen is subjected to uniform tension, thereby achieving uniformity of resin content and consistency of fracture.

[0016] 3. Prevent the reinforcement sheet from falling off during the test

[0017] The utility model can be used for integrally forming a BFRP tensile specimen and a reinforcing sheet, so that the reinforcing sheet and the BFRP tensile specimen can be fully fitted, and the phenomenon of the reinforcing sheet falling off during the stress test is avoided.

[0018] 4. Can ensure the accuracy of mechanical test data

[0019] The utility model can be used to integrally form a BFRP tensile specimen and a reinforcing sheet, so that the reinforcing sheet and the BFRP tensile specimen can be reliably bonded, avoiding insufficient or increased gauge length due to slippage or debonding of the reinforcing sheet, thereby ensuring the accuracy of mechanical test data.

[0020] 5. Simple structure and easy operation

[0021] The utility model has the advantages of simple structure, convenient operation and high sample preparation efficiency, and can batch manufacture required BFRP tensile specimens and perform rapid centering and placement of BFRP tensile specimens.

[0022] The technical features of the basalt fiber reinforced resin-based composite material stretched preform preparation device of the utility model are further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : A schematic diagram of the structure of a basalt fiber reinforced resin-based composite material stretching preform preparation device of the utility model,

[0024] Figure 2 : Figure 1 AA section view;

[0025] In the above drawings, the descriptions of the reference numerals are as follows:

[0026] 1-base, 11-first lower base, 12-second lower base, 101-lower groove,

[0027] 2-connecting rod, 3-BFRP tensile specimen, 4-strengthening sheet,

[0028] 5-upper cover plate, 501-upper groove, 6-centering line. DETAILED DESCRIPTION Embodiment 1

[0029] A basalt fiber reinforced resin-based composite material stretched preform preparation device comprises two lower bases 1 and a connecting rod 2 arranged in parallel; the two lower bases 1 are respectively a first lower base 11 and a second lower base 12, and the left and right ends of the first lower base 11 and the second lower base 12 are respectively provided with a threaded through hole, and the relative threaded through holes of the first lower base 11 and the second lower base 12 are in opposite rotation directions; the two ends of the connecting rod 2 are respectively provided with an external thread in opposite rotation directions and matched with the threaded through hole, and the connecting rod 2 is connected to the first lower base 11 and the second lower base 12 through the external thread to form a whole, forming a frame main structure.

[0030] The two lower bases 1 are respectively provided with lower grooves 101 for placing the ends of the BFRP tensile specimens 3 and the reinforcing sheet 4, and a centering mark 6 for centering when placing the BFRP tensile specimens 3 is provided in the middle of the lower grooves 101; the two lower bases 1 are also fastened to the upper cover plate 5 by fasteners-bolts, and the upper cover plate 5 is provided with an upper groove 501 for accommodating the reinforcing sheet 4 at a position corresponding to the lower groove 101, and the depth of the upper groove 501 is half the depth of the lower groove 101 of the lower base 1.

[0031] The lower base 1 and the upper cover plate 5 are both made of aluminum alloy plates, and the connecting rod 2 is made of stainless steel.

[0032] The production process of this utility model is as follows:

[0033] Step 1, making a reinforcing sheet: cutting out a reinforcing sheet 4 having the same length and width as the lower groove 101 of the lower base 1;

[0034] Step 2: Grinding and cleaning of the reinforcement sheet:

[0035] Grind one end of the reinforcing sheet 4 close to the middle of the BFRP tensile specimen 3 to about 30 degrees for transition to prevent stress concentration at the reinforced part of the specimen during the tensile process; and grind the surfaces where the reinforcing sheets 4 are attached to each other and clean the surfaces;

[0036] Step 3: Assemble the main frame structure:

[0037] The two lower bases 1 are connected into one body by a connecting rod 2 and adjusted to a desired length by a thread to form a frame main structure;

[0038] Step 4: Apply release agent:

[0039] Coat the release agent in the lower grooves 101 of the two lower bases 1 and the upper groove 501 of the upper cover plate 5 respectively; and place the two reinforcing sheets 4 in the lower grooves 101 and the upper grooves 501 respectively;

[0040] Step 5: Apply epoxy resin adhesive to the reinforcement sheet and place the BFRP tensile specimen:

[0041] Apply epoxy resin adhesive to the surface of the reinforcing sheet 4 in the lower groove 101, place the uncured BFRP tensile specimen 3 on the surface of the reinforcing sheet 4, and align it through the centering mark 6 in the lower groove 101;

[0042] Step 6: Install the upper cover:

[0043] Apply epoxy resin adhesive to the reinforcing sheet in the groove 501 of the upper cover plate 5, place the upper cover plate 5 on the lower base 1, and connect the upper cover plate 5 to the two lower bases 1 by bolts; compact the reinforcing sheet 4 and the BFRP tensile specimen 3 by adjusting the tightening force of the bolts, pay attention to observe whether the reinforcing sheet 4 slips axially and whether the BFRP tensile specimen 3 is aligned, and make adjustments in time;

[0044] Step 7: Curing:

[0045] The device, the BFRP tensile specimen 3 and the reinforcing sheet 4 are placed in an oven for curing;

[0046] Step 8: Cutting excess BFRP tensile specimens:

[0047] After the temperature is lowered, the device is dismantled to obtain a BFRP tensile specimen with reinforcement sheets integrally formed at both ends, and the redundant BFRP tensile specimens 3 at both ends of the reinforcement sheets 4 are cut to obtain a basalt fiber reinforced resin-based composite material tensile preform.

Claims

1. A basalt fiber reinforced resin-based composite material stretching preform preparation device, characterized in that: The invention comprises two lower bases (1) arranged in parallel, the two lower bases (1) being connected as a whole via a connecting rod (2); the two lower bases (1) are respectively provided with lower grooves (101) for accommodating the ends of the BFRP tensile test specimens (3) and the reinforcing sheet (4); the two lower bases (1) are also respectively fastened to the upper cover plate (5) via fasteners, and the upper cover plate (5) is provided with an upper groove (501) for accommodating the reinforcing sheet (4) at a position corresponding to the lower groove (101).

2. The device for preparing a basalt fiber reinforced resin-based composite material stretched preform according to claim 1, characterized in that: The two lower bases (1) are respectively a first lower base (11) and a second lower base (12); a threaded through hole is respectively provided at the left and right ends of the first lower base (11) and the second lower base (12); and the threaded through holes of the first lower base (11) and the second lower base (12) are opposite in rotation direction; and the connecting rod (2) has at both ends an external thread which is opposite in rotation direction and matches the threaded through hole; and the connecting rod (2) is respectively connected to the first lower base (11) and the second lower base (12) via the external thread.

3. The device for preparing a basalt fiber reinforced resin-based composite material stretched preform according to claim 1, characterized in that: A centering mark (6) is provided in the middle of the lower grooves (101) of the two lower bases (1) for centering the BFRP tensile test specimen (3) when it is placed.

4. The device for preparing a basalt fiber reinforced resin-based composite material stretched preform according to claim 1, characterized in that: The depth of the upper groove (501) of the upper cover plate (5) is half the depth of the lower groove (101) of the lower base (1).

5. The device for preparing a basalt fiber reinforced resin-based composite material stretched preform according to claim 1, 2, 3 or 4, characterized in that: The lower base (1) and the upper cover plate (5) are both made of aluminum alloy plates, and the connecting rod (2) is made of stainless steel.

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