Hot-press molded glass fiber substrate strain gauge

Abstract

The utility model provides a hot-press molded glass fiber substrate strain gauge, which comprises a glass fiber substrate semi-cured sheet made of glass fiber gridding cloth impregnated by epoxy blended resin; the metal foil is laminated on the upper surface of the glass fiber substrate prepreg; the protective layer is stacked on the upper surface of the metal foil; wherein the glass fiber substrate prepreg and the metal foil as well as the metal foil and the protective layer form an integrated structure through hot-pressing bonding. The utility model provides a hot-press molded glass fiber substrate strain gauge, and aims to simplify the technological process, improve the tensile strength and corrosion resistance of the strain gauge, and ensure the stability and reliability of the strain gauge in various severe environments. According to the technology, by optimizing the components and the proportion of the glass fiber substrate prepreg and controlling the hot pressing temperature, the purpose of softening and automatically releasing the adhesive is achieved, and therefore the overall performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to strain gauge technical field, concretely relates to a hot press forming's glass fiber base strain gauge. BACKGROUND

[0002] The resistance strain gauge is a common electrical measuring element for stress analysis and detection, and the strain gauge is pasted on the component, when the component is deformed under stress, the length and cross-sectional area of the strain gauge also change with the component, and the resistance value changes, and the strain value can be converted into voltage or current signal through the strain gauge and then converted.

[0003] With the diversification development of stress analysis and detection use scene, therefore need to create an easy to paste, high tensile strength not easy to damage and can be used in various harsh environments strain gauge on the basis of simple and efficient process.

[0004] Disadvantages of prior art:

[0005] 1. Base material problem:

[0006] The existing resistance strain gauge is mostly based on phenolic and epoxy, which is easy to show "C" type curling in dry air environment, which makes it difficult to paste and low paste efficiency.

[0007] The moisture absorption rate of this type of base is high, and the insulation resistance decreases under harsh environmental conditions, resulting in unstable output of resistance, voltage or current signal.

[0008] 2. Tensile strength problem:

[0009] The tensile strength of the above type strain gauge is low, and it is easy to break during production and use.

[0010] 3. Process complexity:

[0011] Some existing improvement schemes (such as announcement number: CN201093999Y) propose a glass fiber reinforced base strain gauge, which improves some performance, but its production process is more complicated, and it needs to set adhesive layer between base and metal foil, and set adhesive layer again between metal foil and sealing layer, resulting in long production cycle, low efficiency, and difficult to implement in batches.

[0012] Therefore, the prior art has defects, and needs to be further improved. INVENTION CONTENTS

[0013] In view of the problems existing in the prior art, the utility model provides a hot press forming's glass fiber base strain gauge.

[0014] To achieve the above purpose, the specific scheme of the utility model is as follows:

[0015] The utility model provides a glass fiber substrate strain gauge of hot press forming, it includes:

[0016] The protective layer, the metal foil and the glass fiber substrate prepreg sheet are sequentially stacked from top to bottom.

[0017] Further, the glass fiber substrate prepreg sheet, the metal foil and the protective layer are integrally formed by hot pressing and bonding.

[0018] Further, the glass fiber substrate prepreg sheet includes a glass fiber mesh and epoxy resin glue attached thereto.

[0019] Further, the epoxy resin glue includes resin, curing agent, formamide, ethylene glycol ethyl ether acetate and solvent.

[0020] Further, the epoxy resin glue of the glass fiber substrate prepreg sheet is in a gel phase and softens and releases adhesive during the hot press forming process, and is bonded with the metal foil.

[0021] Further, the protective layer is made of corrosion-resistant composite material, which is bonded with the metal foil by hot pressing, and the protective layer softens and releases adhesive during the hot pressing process.

[0022] Further, the hot pressing and bonding temperature ranges from 100 DEG C to 400 DEG C.

[0023] Further, the tensile strength of the strain gauge is 30 MPa to 300 MPa.

[0024] The technical scheme of the utility model has the following beneficial effects:

[0025] 1. Beneficial effects

[0026] 1. Significantly improves the tensile strength and elastic modulus:

[0027] Through the hot press forming process, especially using epoxy resin glue as the glass fiber substrate prepreg sheet and hot pressing at a temperature of 100 DEG C to 400 DEG C, the glass fiber substrate prepreg sheet and the metal foil can be tightly bonded. This improvement significantly improves the tensile strength and elastic modulus of the strain gauge.

[0028] 2. Improves the corrosion resistance in harsh environments:

[0029] The new strain gauge not only exhibits excellent corrosion resistance in harsh environments such as acid, alkali and oil, but also solves the problem of unstable resistance, voltage or current output of conventional strain gauges under these conditions. This ensures its reliability and stability in various complex environments.

[0030] 3. Simplify the production process and shorten the production cycle:

[0031] The utility model innovatively realizes the purpose that the glass fibre base prepreg and the protective layer release the adhesive independently in the hot pressing process, thereby avoid the complexity and inefficiency problem brought by multiple setting of adhesive layer in the traditional method. This not only simplifies the production process, but also greatly shortens the production cycle, improves the feasibility of mass production.

[0032] 4. Solve the sticking problem and improve the sticking efficiency:

[0033] Compared with the strain gauge with phenolic and epoxy as the base in the prior art, the utility model provides a solution which is easier to stick and not easy to damage, and significantly improves the sticking efficiency.

[0034] 5. Enhance the stability and reliability of the overall structure:

[0035] Through the above-mentioned improvement measures, the strain gauge of the utility model exhibits higher reliability and stability in various stress analysis and detection scenarios, and can meet more diversified and demanding application requirements. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 is the structure surface schematic diagram of the utility model;

[0037] Fig. 2 is the top view of the utility model;

[0038] In the drawing:

[0039] 1, protective layer; 2, metal foil; 3, glass fibre base prepreg. DETAILED DESCRIPTION

[0040] The utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model, not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all structures.

[0041] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween.

[0043] In the description of the present application, the terms "up", "down", "front", "back", "left", "right" and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, which are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0044] In combination Figs. 1-2 As shown in the present application, a hot-pressed glass fiber substrate strain gauge is provided, comprising: a protective layer 1, a metal foil 2, and a glass fiber substrate prepreg sheet 3 stacked in order from top to bottom.

[0045] The glass fiber substrate prepreg sheet 3, the metal foil 2, and the protective layer 1 are integrally formed by hot pressing and bonding.

[0046] The glass fiber substrate prepreg sheet 3 includes a glass fiber mesh and epoxy resin glue attached thereto.

[0047] The epoxy resin glue includes resin, curing agent, formamide, ethylene glycol ethyl ether acetate, and solvent.

[0048] The epoxy resin glue of the glass fiber substrate prepreg sheet 3 is in a gel phase, and is softened and released during the hot pressing process, and is bonded with the metal foil 2.

[0049] The protective layer 1 is made of corrosion-resistant composite material, which is bonded with the metal foil 2 by hot pressing, and the protective layer 1 is softened and released during the hot pressing process.

[0050] The corrosion-resistant composite material includes: forming a composite material through a blending, laminating or coating process of resin and filler, for example:

[0051] Epoxy resin + carbon fiber: high strength and corrosion resistance;

[0052] PTFE + glass fiber: acid and alkali resistant and excellent insulation;

[0053] Phenolic resin + graphite: oil resistant and good high temperature stability.

[0054] The temperature range of the hot pressing adhesion is 100℃-400℃.

[0055] The tensile strength of the strain gauge is 30MPa-300MPa.

[0056] The utility model principle is as follows:

[0057] Material and structure:

[0058] The utility model relates to a kind of hot-pressing glass fiber substrate strain gauge, and its main components include:

[0059] Protective layer 1: located in the uppermost layer, protects internal structure from external environment.

[0060] Metal foil 2: as resistance material, responsible for inductive strain and conversion into electrical signal.

[0061] Glass fiber substrate prepreg sheet 3: provide support and enhance tensile strength.

[0062] Manufacturing process:

[0063] Epoxy blending resin preparation: first, resin, curing agent, formamide, ethylene glycol ether ethyl acetate, solvent etc. are mixed according to certain proportion, and epoxy blending resin glue liquid is prepared.

[0064] Impregnation and pre-baking: glass fiber mesh cloth is immersed in epoxy blending resin glue liquid for impregnation treatment, and then pre-baking is carried out at a certain temperature, so that epoxy blending resin glue liquid enters B stage (gel stage), and glass fiber substrate prepreg sheet 3 is made.

[0065] Hot-pressing:

[0066] First stage: metal foil 2 is placed flat above glass fiber substrate prepreg sheet 3, and hot pressing is carried out through cyclic temperature rise and fall multiple times in the temperature range of 100℃-400℃. In this process, glass fiber substrate prepreg sheet 3 will soften and release glue independently, so that metal foil 2 and glass fiber substrate prepreg sheet 3 are closely bonded.

[0067] Second stage: protective layer 1 is arranged above metal foil 2, and protective layer 1 is also softened and releases glue independently through the same hot pressing process (100℃-400℃), so as to be closely bonded with metal foil 2 layer.

[0068] Working process:

[0069] When the component is deformed under stress, the strain gauge also deforms. Since the metal foil 2 is a resistive material, changes in its length and cross-sectional area will cause changes in its resistance.

[0070] This change in resistance can be measured by the strain gauge and converted into a voltage or current signal, ultimately calculating the strain value.

[0071] The strain gauge has excellent tensile strength and corrosion resistance, and can stably output resistance, voltage or current signals even in harsh environments such as acid, alkali, oil, etc.

[0072] Key innovations

[0073] Self-releasing adhesive: Through the hot pressing process within a specific temperature range, the glass fiber base prepreg sheet 3 and the protective layer 1 can independently release the adhesive, achieving a tight bond between the layers, avoiding the complex and inefficient multi-layer adhesive process in traditional methods.

[0074] High-performance material selection: Using epoxy blended resin as the main component of the glass fiber base, the overall tensile strength and elastic modulus of the strain gauge are significantly improved, and its corrosion resistance in harsh environments is also enhanced.

[0075] In summary, the utility model optimizes material ratio and improves manufacturing process, solves the deficiencies of existing strain gauges in terms of difficulty of sticking, tensile strength and stability, and provides a more reliable and efficient stress analysis and detection solution.

[0076] The above is only the preferred embodiment of the utility model, and does not limit the utility model range, any equivalent structural transformation made under the utility model concept, or direct / indirect application in other related technical fields is included in the protection scope of the utility model.

Claims

1. A hot-press formed glass fibre based substrate strain gauge characterised in that, The application relates to a hot-pressing formed glass fiber substrate strain gauge. The protective layer, the metal foil and the glass fiber substrate prepreg are integrally formed through hot-pressing adhesion.

2. The hot-pressing formed glass fiber substrate strain gauge according to claim 1, wherein the glass fiber substrate prepreg comprises a glass fiber mesh and epoxy resin glue attached to the glass fiber mesh.

3. The hot-pressing formed glass fiber substrate strain gauge according to claim 2, wherein the epoxy resin glue of the glass fiber substrate prepreg is in a gel phase, and is softened and released during the hot-pressing forming process to adhere to the metal foil.

4. The hot-pressing formed glass fiber substrate strain gauge according to claim 1, wherein the protective layer is made of corrosion-resistant composite material, and is softened and released during the hot-pressing process to adhere to the metal foil.

5. The hot-pressing formed glass fiber substrate strain gauge according to claim 1, wherein the hot-pressing adhesion temperature ranges from 100 DEG C to 400 DEG C.

6. The hot-pressing formed glass fiber substrate strain gauge according to claim 1, wherein the tensile strength of the strain gauge ranges from 30 MPa to 300 MPa. ​ ​ ​ ​ ​ ​

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