Device for measuring curing shrinkage rate of glue

Abstract

The utility model discloses a device for measuring the curing shrinkage rate of glue, which comprises a shell, and the shell comprises a top cover and a shell body which are movably connected; a light source is arranged on one surface, facing the inner side of the shell body, of the top cover; a base is arranged in the shell body, a second glass flat sheet is nested in the base, one end of the second glass flat sheet is movably connected with a first glass flat sheet, and a glue measuring position is formed at the other end of the second glass flat sheet; an observation position is arranged on the side wall, opposite to the glue measuring position, of the shell body. The utility model aims to provide a device for measuring the curing shrinkage rate of glue aiming at the problems in the prior art, and the device is used for measuring the curing shrinkage rate of the glue.

Description

Technical Field

[0001] The utility model belongs to the field of glue material measurement, and particularly relates to a device for measuring the curing shrinkage rate of glue. Background Art

[0002] The solidification shrinkage rate of glue is one of the very important physical quantities in the field of optical element manufacturing. For high-precision glued products, the curing shrinkage rate of glue plays a decisive role in the optical performance of the products.

[0003] At present, there are two measurement methods on the market. One is to measure the density before and after curing, and then calculate the shrinkage rate according to the density. A fully automatic curing shrinkage rate tester can be used. The other method is to measure the volume shrinkage rate by measuring the volume of the mold cavity and the cured sample. This method can only measure approximate data, and the data error is relatively large. Summary of the Invention

[0004] The purpose of the utility model is to provide a device for measuring the curing shrinkage rate of glue to measure the curing shrinkage rate of glue in view of the problems existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] According to one aspect of the specification of the utility model, a device for measuring the curing shrinkage rate of glue is provided, which includes a housing. The housing includes a top cover and a body that are movably connected. A light source is provided on the inner side of the top cover facing the body. A base is provided inside the body. A second glass flat plate is nested on the base. One end of the second glass flat plate is movably connected to a first glass flat plate, and a glue measurement position is formed at the other end of the second glass flat plate. An observation position is provided on the side wall of the body opposite to the glue measurement position.

[0007] Furthermore, open the housing, drop the glue to be measured on the right side of the second glass flat plate and cover the first glass flat plate. Since the glue to be measured has a thickness, a wedge-shaped air thin layer is formed between the first glass flat plate and the second glass flat plate. Close the housing and turn on the light source. Due to the principle of light interference, equal-thickness interference fringes can be formed on the upper surface of the first glass flat plate. Use an observation device to record the positions of the interference fringes and observe the changes in the positions of the interference fringes before and after the glue to be measured cures.

[0008] Optionally, the housing includes a top cover and a body that are movably connected. When the top cover and the body are completely closed, an opaque sealed environment is formed, which can avoid interference from external light on the device and affect the formation of equal-thickness interference fringes.

[0009] Furthermore, the light source can be a monochromatic parallel light source, aiming to form clear equal-thickness interference fringes after the light passes through the device.

[0010] Optionally, the first glass plate and the second glass plate can be movably connected by a hinge, a rotating shaft, or an adjusting bracket, such that the first glass plate rotates relative to the second glass plate within a plane, ensuring that there is an air wedge angle between the two during the rotation of the first glass plate.

[0011] Optionally, an observation device is provided at the observation position, which can be a camera, a complementary metal-oxide-semiconductor sensor (CMOS), a charge-coupled device (CCD), or a low-power microscope, for observing and recording the position of the equal-thickness interference fringes.

[0012] Furthermore, the base is in an L shape and is adapted to the housing body, fixing the second glass plate to prevent errors in the interference fringes caused by the movement of the second glass plate during the process.

[0013] Furthermore, the observation device is on the inner wall of the housing body and is placed in a non-interfering area of the light source to prevent the light from being blocked by the observation device and affecting the generation of the equal-thickness interference fringes.

[0014] Furthermore, both the first glass plate and the second glass plate are polished light-transmitting glass plates.

[0015] Furthermore, due to the thickness of the glue to be measured, a wedge-shaped air thin layer is formed between the first glass plate and the second glass plate. Through the principle of light interference, clear equal-thickness interference fringes can be formed on the upper surface of the first glass plate.

[0016] Optionally, the curing method of the glue to be measured is selected according to the characteristics of the glue, including natural curing, light curing, etc.

[0017] Furthermore, due to the shrinkage of the glue to be measured, the air wedge angle between the first glass plate and the second glass plate changes, resulting in a change in the formed interference fringes.

[0018] Furthermore, by comparing the position changes of the equal-thickness interference fringes formed before and after the curing of the glue to be measured, the change amount ΔN of the number of fringes is obtained.

[0019] According to the general formula for constructive interference under equal-thickness interference conditions ;

[0020] where λ is the wavelength of the monochromatic parallel light source, is the thickness between the air thin layers, j is an integer representing the interference order, and n is the refractive index of the wedge-shaped air thin layer.

[0021] The thickness difference between two adjacent bright fringes is ;

[0022] Due to the air wedge, n = 1, and the height change amount of the glue to be measured can be obtained as:

[0023] , namely .

[0024] Let N be the number of stripes before curing, and let Y be the height of the glue to be measured before curing. According to Y = N×(Δd);

[0025] Obtain .

[0026] According to the calculation formula for the shrinkage rate of the glue to be measured after solidification: Shrinkage rate = ;

[0027] Obtain the shrinkage rate = .

[0028] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model keeps the positions of the light source, glass flat plate, base, and observation device unchanged, only changes the thickness of the glue before and after curing, eliminates the interference of these factors on the results by controlling other factors except the target variable to be unchanged, making the evaluation more accurate and improving the accuracy and reliability of the testing device; The parts adopted in the present utility model have high measurement accuracy and the structure is easy to implement, and the effect of accurately measuring the curing shrinkage rate of the colloid can be achieved through mutual cooperation; Compared with other measurement methods, its practicability, convenience, and environmental protection are all highly improved, the structure is simple, and the purchase and maintenance costs of the equipment are saved. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of a device for measuring the curing shrinkage rate of glue according to the present utility model;

[0030] Reference numerals: 1, glass flat plate 1; 2, glass flat plate 2; 3, light source 3; 4, hinge 4; 5, base 5; 6, glue to be measured 6; 7, observation device 7; 8, top cover 8; 9, shell body 9; 10, housing. Specific Embodiments

[0031] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work conditions belong to the scope of protection of the present utility model.

[0032] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "parallel", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "bonding" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0034] Such as Figure 1 , build a test device:

[0035] A housing 10, the housing 10 includes a top cover 8 and a housing body 9 which are movably connected; a light source 3 is provided on the surface of the top cover 8 facing the inside of the housing body 9; a base 5 is provided inside the housing body 9, a glass flat plate 2 is nested in the base 5, one end of the glass flat plate 2 is movably connected to a glass flat plate 1, and the other end of the glass flat plate 2 forms a measurement position for the glue 6 to be measured; an observation device 7 is provided on the side wall of the housing body 9 opposite to the measurement position of the glue 6 to be measured.

[0036] Further, the glass flat plate 1 and the glass flat plate 2 are movably connected by a hinge 4.

[0037] Further, the observation device 7 is located in a non-interference area of the light source 3.

[0038] The light source 3 in this embodiment adopts a UVLED parallel light source, which can switch between white light and ultraviolet light.

[0039] Further, the glue 6 to be measured adopts a photosensitive glue.

[0040] Further, the observation device 7 adopts a camera.

[0041] Furthermore, the glass flat sheet 1 and the glass flat sheet 2 are connected by a hinge.

[0042] Furthermore, open the housing 10, drop the glue 6 to be measured on the right side of the glass flat sheet 2 and cover the glass flat sheet 1. Since the glue 6 to be measured has a thickness, a wedge-shaped air thin layer is formed between the glass flat sheet 1 and the glass flat sheet 2. Close the housing 10 and turn on the light source 3. Due to the principle of light interference, equal-thickness interference fringes can be formed on the upper surface of the glass flat sheet 1. Use the observation device 7 to record the position of the interference fringes and observe the change in the position of the interference fringes before and after the glue 6 to be measured cures.

[0043] Before the glue 6 to be measured cures, turn on the white light irradiation mode of the light source 3. The white light emitted by the light source 3 passes through the glass flat sheet 1 and the glass flat sheet 2, and the number N of equal-thickness interference fringes formed on the upper surface of the glass flat sheet 1 is recorded through the observation device 7.

[0044] Switch the light source 3 to the ultraviolet irradiation mode. After irradiating the glue 6 to be measured until it is completely cured, switch the light source 3 back to the white light irradiation mode. Since the glue 6 to be measured has shrinkage, the angle of the air wedge between the glass flat sheet 1 and the glass flat sheet 2 changes, and the number of equal-thickness interference fringes formed also changes. Record the number of equal-thickness interference fringes after the change to obtain the change amount ΔN of the fringe number.

[0045] According to the general formula for constructive interference under the condition of equal-thickness interference ;

[0046] where λ is the wavelength of the monochromatic parallel light source, is the thickness between the air thin layers, j is an integer representing the interference order, and n is the refractive index of the wedge-shaped air thin layer.

[0047] The thickness difference between two adjacent bright fringes is ;

[0048] Due to the air wedge, n = 1, and the height change amount of the glue to be measured can be obtained as:

[0049] , that is .

[0050] Let N be the number of fringes before curing, and Y be the height of the glue to be measured before curing. According to Y = N×(Δd);

[0051] Obtain .

[0052] According to the calculation formula for the shrinkage rate of the glue to be measured after solidification: shrinkage rate = ;

[0053] Obtain shrinkage rate = .

[0054] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the curing shrinkage of glue, characterized in that: include: The shell comprises a top cover and a shell body that are movably connected; a light source is provided on a side of the top cover that faces the inner side of the shell body; a base is provided in the shell body, a second glass sheet is nested in the base, one end of the second glass sheet is movably connected to the first glass sheet, and a glue measuring position is formed on the other end of the second glass sheet; an observation position is provided on the side wall of the shell body opposite to the glue measuring position.

2. The device for measuring glue curing shrinkage according to claim 1, characterized in that: When the top cover and the shell body are completely closed, a light-proof sealed environment is formed.

3. The device for measuring glue curing shrinkage according to claim 1, characterized in that: The light source comprises a monochromatic parallel light source.

4. The device for measuring glue curing shrinkage according to claim 1, characterized in that: The observation position is provided with an observation device.

5. The device for measuring glue curing shrinkage according to claim 4, characterized in that: The observation device is placed in a non-interference area of ​​the light source.

6. The device for measuring glue curing shrinkage according to claim 1, characterized in that: The base is L-shaped and matches the bottom of the shell body.

7. The device for measuring glue curing shrinkage according to claim 1, characterized in that: The first glass plate and the second glass plate are both polished light-transmitting glass plates.

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