A method for testing the curing rate of a filled adhesive

Abstract

The application discloses a kind of filling glue solidification rate test sampling device and method, it includes installation main body, the closed shape of being arranged in the bottom of installation main body Punch, a plurality of limit top rods are located in the closed shape Punch side, shovel knife module is installed on the installation main body and is shovelled glue by opening and closing action in the bottom of the closed shape Punch, push rod is set in the installation main body and pushes out the glue in the closed shape Punch outward, up and down movement.The application can efficiently, reliably realize the sampling of LED product filling glue, and can guarantee the shape, thickness consistency of sample each time sampling, reduce the risk of fragmentation, provide prerequisite for guaranteeing the precision and reliability of subsequent solidification rate test results.

Description

Technical Field

[0001] This invention belongs to the field of cured adhesive sampling technology, and in particular relates to a sampling method for testing the curing rate of filler adhesives. Background Technology

[0002] LED products generally consist of a substrate, LED circuitry laid on the substrate, and a filler adhesive that fixes the LED circuitry and isolates it from the outside environment or encapsulates it. Depending on product manufacturing or maintenance needs, the filler adhesive needs to be sampled for curing rate testing. In existing technologies, sampling of the filler adhesive on the surface of LED products is done manually; some use a combination of tweezers and a pen knife to remove it, while others use a utility knife. However, these methods have many drawbacks: 1) The quality of the sample depends heavily on the skill of the sampler, leading to unstable quality and irregular sample shapes; 2) They are time-consuming, affecting overall efficiency; 3) The lack of uniformity in sample shape and thickness reduces the accuracy of test results; 4) When sampling the filler adhesive, a certain thickness of adhesive needs to be removed. Therefore, it is necessary to cut the adhesive from the surrounding adhesive at the bottom. However, using a utility knife and tweezers for manual sampling is very inconvenient and can easily damage the substrate of the LED product; 5) The adhesive used to fill LED products is a colorless and transparent new synthetic polymer material called polysiloxane. It has good chemical stability, excellent electrical insulation, and resistance to high and low temperatures. It also has a high compressibility, good moisture resistance, and low surface tension after thermosetting. Therefore, it is easy to break the sample when it is in the cured state. The sampling success rate is low when using a regular blade to dig it out. It is easy to cause unevenness on the adhesive surface. The sample may also break during the tweezers gripping process, leading to sampling failure.

[0003] Therefore, it is necessary to provide a new sampling device and method for testing the curing rate of filler adhesives to solve the above problems. Summary of the Invention

[0004] The main objective of this invention is to provide a sampling method for testing the curing rate of filler adhesives, which can efficiently and reliably sample filler adhesives for LED products, and ensure that the shape and thickness of each sample are consistent, reducing the risk of breakage and providing a prerequisite for ensuring the accuracy and reliability of subsequent curing rate test results.

[0005] This invention achieves the above objective through the following technical solution: a sampling method for testing the curing rate of a filler adhesive, comprising the following steps:

[0006] S1. On LED products, determine the adhesive application area, avoiding the location of LED lights;

[0007] S2. A filling adhesive curing rate testing and sampling device is provided, comprising an installation body, a closed-shaped punch disposed at the bottom of the installation body, several limiting rods located next to the closed-shaped punch, a scraper module mounted on the installation body and scraping adhesive at the bottom of the closed-shaped punch through opening and closing actions, and a push rod that is vertically movable within the installation body to push the adhesive inside the closed-shaped punch outward; the closed-shaped punch is hollow inside and forms a trumpet-shaped receiving cavity that is smaller at the top and larger at the bottom, and a blade edge is formed at the bottom of the trumpet-shaped receiving cavity; multiple limiting rods are provided, fixed to the bottom of the installation body and arranged around the closed-shaped punch; the bottom end of the limiting rod protrudes from the closed-shaped punch; and the bottom end of the limiting rod has a spherical structure; the scraper module includes scrapers symmetrically distributed on both sides of the closed-shaped punch, one end of the scraper is hinged to the installation body and the other end extends to the end of the closed-shaped punch to perform the scraping action;

[0008] S3. Insert the blade into the adhesive sampling area to a set depth and press to separate the sampled adhesive from the surrounding adhesive.

[0009] S4. The closed punch maintains the cutting state, and the shovel is used to sample from both sides of the blade edge and shovel into the bottom of the blade edge. The shovel closes to separate the sampled colloid from the bottom colloid, thus achieving the peeling of the sampled colloid.

[0010] S5. Release the shovel to open it, and use the push rod to insert into the trumpet-shaped receiving cavity to push out the sampled colloid.

[0011] Furthermore, the scraper includes a handle portion and a blade body portion; the blade body portion has an overall flat structure and its thickness gradually decreases along the scraping direction; the blade body portion has a linear cutting edge formed at the tip end.

[0012] Furthermore, one end of the handle is hinged to the mounting body and is kept in an open state by a reset elastic element.

[0013] Furthermore, the installation body has a hollow interior forming a movable cavity, and the push rod is movably disposed within the movable cavity, which is connected to the trumpet-shaped storage cavity.

[0014] Compared with existing technologies, the beneficial effects of the sampling method for testing the curing rate of filler adhesive of this invention are as follows: it reduces the skill requirements of sampling personnel, ensures the uniformity of sample size, and effectively avoids LED components during the sampling process, reducing the risk of LED doping in the test sample and effectively improving the service life of SeZn crystals; the entire sampling process is simple to operate, requiring only 15-30 seconds to take a single test adhesive sample, and the sampling is uniform, with no consumables consumed during the process, resulting in high sampling efficiency; the inner bevel design of the closed-shaped punch hole greatly improves the integrity of the sampled adhesive, effectively solving the problems of easy breakage and edge damage of small-diameter sampled adhesives; the structural design of the spatula enables the peeling of the sampled adhesive and improves the flatness of the peeled surface, ensuring the overall thickness of the sampled adhesive is consistent, laying an important foundation for obtaining reliable and effective test results. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the shovel in the open state according to an embodiment of the present invention;

[0016] Figure 2 This is a partial structural diagram of the closed-shaped punch in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the shovel in the closed state according to an embodiment of the present invention;

[0018] The numbers in the diagram represent:

[0019] 100 Filler Adhesive Curing Rate Testing Sampling Device;

[0020] 1-Main mounting body; 2-Closed punch, 21-Flare-shaped receiving cavity, 22-Blade edge; 3-Limiting rod; 4-Shovel module, 41-Shovel, 411-Handle, 412-Body; 5-Push rod; 6-Mounting bracket. Detailed Implementation

[0021] Example 1:

[0022] Please refer to Figures 1-3 This embodiment is a sampling device 100 for testing the curing rate of filler adhesive, which includes an installation body 1, a closed-shaped punch 2 disposed at the bottom of the installation body 1, several limiting rods 3 located next to the closed-shaped punch 2, a scraper module 4 installed on the installation body 1 and scraping adhesive at the bottom of the closed-shaped punch 2 by opening and closing actions, and a push rod 5 that is movably disposed in the installation body 1 to push the adhesive in the closed-shaped punch 2 outward.

[0023] The shape of the closed-type punch 2 is flexibly designed according to the shape of the required sampled colloid, and can be a regular or irregular geometric shape such as circle, square, triangle, pentagon, plum blossom, etc. The inner hole of the closed-type punch 2 is a flared structure with a smaller upper part and a larger lower part, forming a flared receiving cavity 21, and a cutting edge 22 is formed at the bottom. The internal bevel design of the closed-type punch 2 effectively increases the sharpness of the cutting edge 22, while maximizing the integrity of the sampled colloid. Through the design of the flared structure, when punching downwards into the colloid, the cutting edge 22 penetrates into the colloid to a certain depth, and the colloid is embedded in the flared receiving cavity 21. The upper circumferential diameter of the cavity is small and the lower circumferential diameter is large. Therefore, during the process of embedding the colloid into the flared receiving cavity 21, the upper part of the colloid is subject to an inward restraining force. This restraining force can effectively constrain the colloid as a whole, maintain the structural integrity of the colloid, and prevent breakage.

[0024] In this embodiment, the term "closed" in the closed punch 2 refers to the fact that its blade shape is a closed graphic rather than an open graphic structure, so as to ensure that a complete colloid can be cut out during punching.

[0025] Many LED products use LED light arrays, requiring sampling to avoid the LEDs. This poses a significant challenge for LED products with small LED spacing, forcing sampling to bypass the LEDs and resulting in a very small sample area, sometimes only a circular area with a diameter of 2-3 mm. The smaller the sample diameter, the more prone the filler sample is to breakage and compromise its integrity. This application addresses this issue by using a blade edge 22 with an inner diameter of 2.3 mm and an outer diameter of 3 mm, allowing for a sample product diameter of approximately 2.3 mm. The closed-shaped punch 2 features an inward bevel design, combined with a flared housing 21. This design increases the blade's cutting ability, reducing edge breakage of the sampled product. Furthermore, the peripheral space constraint ensures the integrity of the sampled product, minimizing the risk of breakage and significantly increasing the contact area between the sample and the testing module, thus improving testing accuracy.

[0026] The closed-type punch 2 can be designed as an integral structure with the mounting body 1, or it can be a separate structure. It is preferred to be a separate structure, which makes it convenient to replace the closed-type punch 2.

[0027] In this embodiment, multiple limiting rods 3 (e.g., 2, 3, or 4) are fixed to the bottom of the mounting body 1 and surround the closed-shaped punch 2. They are mainly used to limit the cutting depth of the closed-shaped punch 2, preventing it from contacting the substrate and thus protecting both the punch 2 and the substrate. The bottom end of the limiting rod 3 protrudes beyond the closed-shaped punch 2, so that when the closed-shaped punch 2 cuts the colloid, the limiting rod 3 first holds the colloid to the substrate surface. To further prevent the limiting rod 3 from damaging the substrate, the bottom end of the limiting rod 3 has a spherical structure.

[0028] The scraper module 4 includes scrapers 41 symmetrically distributed on both sides of the closed-shaped punch 2. Each scraper 41 includes a handle portion 411 and a blade body portion 412. One end of the handle portion 411 is hinged to the mounting body 1 and is kept in an open state by a reset elastic element (not shown in the figure, such as a torsion spring). The blade body portion 412 gradually flattens along the blade head direction and forms a linear cutting edge at the blade head end. The two scrapers 41 swing from the open state to the closed state. During this process, the blade body portion 412 performs a scraping action in an arc swinging manner. Combined with the flat blade body structure, it makes it easier to cut into the bottom of the adhesive surface, quickly and neatly severing the connection between the sampled adhesive and the bottom adhesive. The horn-shaped receiving cavity 21 constrains the sampled adhesive, effectively preventing it from cracking or breaking.

[0029] The blade body 412 can be moved to the bottom of the closed punch 2 by the swinging of the handle 411. In the closed state, the linear cutting edge of the blade body 412 can completely peel off the sampled colloid. Preferably, the length of the linear cutting edge is equal to or slightly smaller than the diameter of the blade edge 22.

[0030] The limiting rods 3 are preferably two in number, symmetrically arranged on both sides of the closed punch 2, and arranged to avoid the space required for the blades 41 to perform opening and closing actions. For example, the limiting rods 3 are located on the front and rear sides of the closed punch 2, while the blades 412 of the two blades 41 open and close from the left and right sides at the bottom of the closed punch 2.

[0031] The mounting body 1 is provided with a mounting bracket 6, and the scraper 41 is hinged to the mounting bracket 6. Specifically, the upper end of the handle portion 411 is hinged to the mounting bracket 6, and the blade body portion 412 is located at the lower end of the handle portion 411. A support groove (not shown in the figure) is formed on the mounting bracket 6, and a rotating shaft (not shown in the figure) is provided in the support groove. The two ends of the rotating shaft are located in two opposite inner wall insertion holes of the support groove. The upper end of the handle portion 411 is placed in the support groove through the rotating shaft. A circular hole is provided in the middle of the mounting bracket 6 for the mounting body 1 to pass through. The mounting bracket 6 can be locked and fixed by a set screw. By adjusting the position of the mounting bracket 6 on the mounting body 1, the scraping depth of the blade body portion 412 in the closed state can be adjusted. The reset elastic element is mounted around the rotating shaft, so that the handle portion 411 is in the open state.

[0032] The mounting body 1 has a hollow interior forming a movable cavity (not shown in the figure). The push rod 5 is installed in the movable cavity, which is connected to the trumpet-shaped receiving cavity 21. After sampling, by pushing the push rod 5 downward, the push rod 5 extends into the trumpet-shaped receiving cavity 21 and pushes the sampled colloid out onto the testing machine or testing fixture.

[0033] This embodiment also provides a sampling method for testing the curing rate of filler adhesive, which includes:

[0034] S1) Place the LED product at the upper limit of the fixture, select the center position of the four LED lights, and determine the glue dispensing area by avoiding the position of the LED lights;

[0035] S2) A closed punch 2 is provided, the inside of which is a funnel-shaped receiving cavity 21 that is smaller at the top and larger at the bottom, and a blade edge 22 is formed at the bottom of the funnel-shaped receiving cavity 21.

[0036] S3) Insert the blade edge 22 into the adhesive sampling area to a set depth and press to separate the sampled adhesive from the surrounding adhesive.

[0037] S4) The closed punch 2 is kept in a cutting state. A pair of shovels 41 are used to sample from the two sides of the blade 22 at a 45° angle and shovel into the bottom of the blade 22. The pair of shovels 4 are closed to separate the sampled colloid from the bottom colloid, thus achieving the peeling of the sampled colloid.

[0038] S5) Loosen the spatula 4 to open it, and use a push rod 5 to insert into the trumpet-shaped receiving cavity 21 to push out the sampled colloid and place it in the set position, such as the fixture of the test equipment, for subsequent curing rate testing.

[0039] In step S3), the insertion depth of the blade edge 22 is limited by setting a limiting rod 3 on the side of the closed punch 2. The scraping part of the scraper 41 has a flat structure and its thickness gradually decreases along the scraping direction.

[0040] This embodiment presents a sampling method for testing the curing rate of filler adhesive, which reduces the skill requirements of the sampling personnel, fixes the sample size, eliminates the possibility of inconsistent sample sizes, and can effectively avoid LED components during the sampling process, reducing the risk of LED doping in the test sample and effectively improving the service life of SeZn crystals. The sampling operation is simple, requiring only 15-30 seconds to take a single test adhesive sample, and the sample is uniform. There is no consumable consumption during the process, and the sampling efficiency is high.

[0041] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A method of sampling for filled rubber cure rate testing, the method comprising: The method comprises the following steps: ​ S1, determining a glue taking area avoiding LED lamp position on the LED product; S2, providing a filling glue curing rate test sampling device, which comprises a mounting body, a closed punch knife arranged at the bottom of the mounting body, a plurality of limiting top rods arranged beside the closed punch knife, a spade knife module installed on the mounting body and capable of shoveling glue at the bottom of the closed punch knife through opening and closing actions, and a push rod movably arranged in the mounting body and capable of pushing the glue in the closed punch knife outward; the closed punch knife is hollow and has a horn-shaped receiving cavity with a small upper part and a large lower part, and a blade edge opening is formed at the bottom of the horn-shaped receiving cavity; the limiting top rods are arranged in multiple, fixed at the bottom of the mounting body and arranged around the closed punch knife; the bottom end of the limiting top rod protrudes from the closed punch knife; the bottom end of the limiting top rod is a spherical surface structure; the spade knife module comprises spade knives symmetrically arranged on both sides of the closed punch knife, one end of the spade knife is hingedly arranged on the mounting body and the other end extends to the end of the closed punch knife to perform a shoveling action; S3, inserting the blade edge opening into the glue taking area to a set depth, and pressing and cutting to separate the sampling glue from the surrounding glue; S4, keeping the closed punch knife in a pressing and cutting state, and using the spade knives to be shovelled into the bottom of the blade edge opening from both sides of the blade edge opening in a rotary swing manner, the spade knives are closed to separate the sampling glue from the bottom glue, and the sampling glue is peeled off; S5, loosening the spade knives to be in an open state, and using the push rod to be inserted into the horn-shaped receiving cavity to push out the sampling glue.

2. The method of claim 1, wherein: The spade knife comprises a handle part and a body part; the body part has a flat structure as a whole and gradually decreases in thickness along the glue shoveling direction; and a linear blade edge is formed at the head end of the body part.

3. The method of claim 2, wherein: One end of the handle part is hingedly arranged on the mounting body and kept in an open state through a reset elastic element.

4. The method of claim 1, wherein: The mounting body is hollow and has a movable cavity, the push rod is movably arranged in the movable cavity, and the movable cavity is communicated with the horn-shaped receiving cavity. The spade knife comprises a handle part and a body part; the body part has a flat structure as a whole and gradually decreases in thickness along the glue shoveling direction; and a linear blade edge is formed at the head end of the body part. One end of the handle part is hingedly arranged on the mounting body and kept in an open state through a reset elastic element. The mounting body is hollow and has a movable cavity, the push rod is movably arranged in the movable cavity, and the movable cavity is communicated with the horn-shaped receiving cavity.

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