Resin reflux filtering structure

Abstract

The utility model discloses a resin reflux filter structure, including filter component and support frame, still including filter and filter screen, and support pole main part is main support column, and the connecting ring is set in the upper end of support pole main part, and the connecting structural member is set in the lower extreme of support pole main part, and the connecting structural member is adapted with the tank edge of glue tank, and the connecting ring is used for installing filter component, and the connecting structural member is used for fixed support pole main part, and this kind of resin reflux filter device compares with the simple filter mode of current use, and the operation is simpler, and convenient to replace, saves time, can directly observe the yarn hair content in filter screen, when yarn hair increases and slows down the filtration speed, can stir yarn hair in it and make filtration speed fast, convenient and fast operation, and when not put filter screen, the device can also filter certain yarn hair, has no idle period, prevents when replacing filter screen, and some unfiltered resin will enter glue tank, has higher use flexibility.

Description

Technical Field

[0001] This utility model relates to the technical field of production equipment for composite materials, specifically a resin reflux filtration structure. Background Technology

[0002] In the impregnation process of composite material pultrusion or filament winding production lines, when carbon fibers are immersed in the resin tank, some yarn fibers will also enter the tank. When the carbon fibers pass through the preforming and molding dies, excess resin will be squeezed out. During the extrusion process, a large amount of yarn fibers will also re-enter the resin tank with the resin, resulting in an increase in the yarn fiber content in the tank. The resin in the tank is recycled through a reflux device, and the yarn fibers will also circulate with it. Yarn fibers adhering to the carbon fibers and entering the preforming and molding dies will cause surface fiber bending, affecting the appearance quality and surface material properties. In severe cases, it may cause mold blockage, production line shutdown, and reduced production efficiency.

[0003] The current solution to this problem is to filter lint by covering the outlet of the return pipe with a filter cloth. However, this type of filter is inconvenient to replace. Each replacement requires manually unwrapping the filter cloth full of lint and binding a new filter cloth, which is time-consuming. Furthermore, it is not possible to visually observe whether there is enough lint to warrant replacement. During the replacement process, the resin in the return pipe is unobstructed, and some unfiltered resin will enter the glue tank, increasing the lint content in the glue tank. Therefore, a solution is designed where the filter screen is simply placed inside the filter device, and the lint content inside the screen can be visually observed. When the lint increases and the filtration speed slows down, the lint can be stirred to speed up the filtration. When replacing the filter screen, simply gather it up, remove it, and replace it with a new one. This method is convenient and quick to operate. Utility Model Content

[0004] The purpose of this utility model is to provide a resin reflux filtration structure to solve the problems mentioned in the background art, such as inconvenience in replacement, the need to manually untie the filter cloth full of yarn and tie on the new filter cloth each time, which takes a lot of time, and the inability to visually observe whether there is enough yarn to need to be replaced. During the replacement process, the resin in the reflux pipe is unobstructed, and some unfiltered resin will enter the glue tank, increasing the yarn content in the glue tank.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a resin reflux filtration structure, including a filter component and a support structure, further including a filter and a filter screen. The filter component is composed of a filter and a filter screen, and a glue groove is provided below the filter component. The support structure includes a support rod body, a connecting ring, and a connecting structural member. The support rod body is the main support column, the connecting ring is located at the upper end of the support rod body, and the connecting structural member is located at the lower end of the support rod body. The connecting structural member is adapted to the groove edge of the glue groove. The connecting ring is used to install the filter component, and the connecting structural member is used to fix the support rod body.

[0006] Based on the preferred embodiment of this technical solution, the filter has an open funnel-shaped structure, the lowest point of the filter is projected onto the horizontal plane within the glue tank, the filter screen has a flexible mesh structure, and the bottom of the inner tank of the filter is an arc surface.

[0007] Based on the preferred embodiment of this technical solution, the support rod body is divided into an upper support rod and a lower support rod. A support rod reinforcing rib is provided at the corner of the support rod body. The upper end of the support rod is provided with a threaded hole, and the end of the connecting ring is provided with a thread. The upper support rod is threaded to the end of the connecting ring. The outer surface of the lower support rod is provided with a thread. The end of the connecting structure is provided with a threaded hole, and the lower support rod is threaded to the connecting structure.

[0008] In the preferred embodiment of this technical solution, the connecting structure is a metal part that connects the glue groove and the main body of the support rod, and the connecting structure is fixedly connected to the glue groove by four bolts.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. Compared with the existing simple filtration method, this resin reflux filtration device is simpler to operate, easier to replace, and saves time. It allows for direct observation of the fiber content in the filter screen. When the fiber content increases and the filtration speed slows down, the fiber can be stirred to speed up the filtration. The operation is convenient and quick. Even without a filter screen, the device can still filter a certain amount of fiber, eliminating the gap period and preventing some unfiltered resin from entering the glue tank when replacing the filter screen. It has greater flexibility in use. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of one embodiment of the resin reflux filtration structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the filter structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the support rod structure of this utility model;

[0014] Figure 4 This is a schematic diagram of the connecting structure of this utility model;

[0015] Figure 5 This is a schematic diagram of the connecting ring structure of this utility model.

[0016] In the diagram: 1. Filter component; 2. Support structure; 3. Glue tank; 11. Filter; 12. Filter screen; 21. Support rod body; 22. Connecting ring; 23. Connecting structural component; 211. Upper part of support rod; 212. Lower part of support rod; 213. Support rod reinforcing rib. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] A resin recirculation filter structure typically refers to a guide plate or baffle with a filter screen or grid installed in the impregnation tank (or resin bath), dividing the tank into a main impregnation zone and a recirculation zone. Its core functions can be summarized in three points: blocking and separating solid impurities mixed in the resin (such as environmental dust, curing agent clumps, fiber lint, etc.); promoting resin circulation and maintaining the uniformity of resin components (preventing filler sedimentation); and controlling the resin content of the fibers: scraping off excess resin from the surface of the fiber bundles and precisely controlling the amount of resin entering the molding die. In continuous production, the resin tank is open or semi-open, inevitably allowing dust from the air, lint scraped off by the fiber bundles during movement, and incompletely mixed curing agent or filler particles to fall in. If these impurities enter the mold with the fibers, they can create defects inside the product (such as stress concentration points) or directly damage the smoothness of the product surface, leading to defective or even scrap products. The filter screen on the recirculation filter structure (usually stainless steel mesh, with the mesh size selected according to process requirements) physically blocks these impurities. The resin carried by the fiber bundles passes through the filter screen, while most impurities are retained or settled in the reflux zone. Regular cleaning of the reflux zone easily removes these impurities without contaminating or replacing all the resin in the main impregnation zone. Resin, especially resin with a large amount of filler (such as resin used in pultrusion), will gradually settle under static conditions due to the filler (such as aluminum hydroxide and calcium carbonate), resulting in low viscosity at the top and high viscosity at the bottom, leading to uneven composition. This uneven resin composition causes inconsistent performance and curing degrees in different sections of the product, and may even result in surface defects such as mottled appearance and whitening. The reflux filtration structure is part of the resin circulation system. Excess resin, under pressure, passes through the filter screen into the reflux zone and is then pumped back to the main impregnation zone (or pumped out from the main impregnation zone, filtered, and then refluxed). This continuous circulation process acts as a "stirring" mechanism, effectively preventing filler settling and ensuring the uniformity of the resin's chemical composition and viscosity.

[0019] The edges of the baffles or guide plates in the reflux filter structure are typically precisely designed with a small gap between them and the fiber bundle's path. When a fiber bundle carrying excess resin passes through this gap, the excess resin on its surface is "scraped" off and flows back to the reflux zone. By adjusting the size of this gap, the resin content of the fiber bundle before entering the mold can be controlled very precisely, ensuring that the product achieves the designed fiber / resin ratio. The reflux zone acts as a buffer and can be linked with a liquid level sensor and an automatic glue replenishment system. When the resin level in the main impregnation zone drops due to being carried away by the fibers, the system can pump resin from the reflux zone to replenish it, maintaining a high level of stability in the main impregnation zone, thus ensuring the continuity of the impregnation effect. The role of controlling the resin content is particularly prominent. Pultrusion processes have extremely high requirements for resin content control, directly affecting the dimensional stability, mechanical properties, and surface quality of the product. The reflux filter structure is a key element in achieving this control. In winding molding, the roles of filtration and homogenization are even more important. The winding process also has requirements for the resin content of the yarn, but this is usually adjusted through devices such as extrusion rollers. Resins used for winding typically focus on preventing filler settling and maintaining cleanliness to ensure yarn uniformity and the intrinsic quality of the finished product.

[0020] The filter screen on the reflux filtration structure is quickly clogged by carbon fiber fibers. Once clogged, resin circulation is impaired, and its homogenization and filtration functions immediately fail. Tiny carbon fiber particles enter the preforming zone (inlet zone) of the mold with the resin and accumulate there. This gradually changes the flow channel shape inside the mold, increases the resistance to fiber passage, and eventually leads to scratches on the product surface or even complete mold blockage, forcing the production line to stop for cleaning. The fibers, as solid impurities, are uniformly mixed in the resin, contaminating the entire resin system and turning the originally precisely formulated resin into a "dirty" mixture.

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-5This utility model provides an embodiment of a resin reflux filtration structure, including a filter component 1 and a support structure 2, and further including a filter 11 and a filter screen 12. The filter component 1 is composed of the filter 11 and the filter screen 12, and a glue groove 3 is provided below the filter component 1. The support structure 2 includes a support rod body 21, a connecting ring 22, and a connecting structural member 23. The support rod body 21 is the main support column, the connecting ring 22 is located at the upper end of the support rod body 21, and the connecting structural member 23 is located at the lower end of the support rod body 21. The connecting structural member 23 is appropriately positioned at the edge of the glue groove 3. The device is equipped with a connecting ring 22 for installing the filter component 1 and a connecting structural component 23 for fixing the support rod body 21. This type of resin recirculation filter not only makes it very convenient to replace the filter screen 12, but also adopts an exposed design, which allows for direct observation of the fiber content inside the filter screen 12. When the fiber content increases and the filtration speed slows down, the fiber can be stirred to speed up the filtration. The operation is convenient and quick. Moreover, the device can filter a certain amount of fiber even without the filter screen, without any gap period. This prevents some unfiltered resin from entering the glue tank 3 when replacing the filter screen 12, thus providing greater flexibility in use.

[0023] Please see Figure 2 A further solution based on this embodiment is as follows: the filter 11 has an open funnel-shaped structure, and the lowest point of the filter 11 is projected onto the horizontal plane within the glue tank 3. The filter screen 12 has a flexible mesh structure, and the bottom of the inner groove of the filter 11 is an arc surface. The filter screen 12 is used for the main filtration of yarn and wool, while the filter 11 itself is used for auxiliary filtration. With this filtration method, the device can filter a certain amount of yarn and wool even without the filter screen 12, without any gap period, and has higher flexibility of use. It also prevents some unfiltered resin from entering the glue tank 3 when the filter screen 12 is replaced. The lower end of the inner groove of the filter 11 is rounded, which increases the filtration area and indirectly increases the filtration rate.

[0024] Please see Figures 3-5 A further solution based on this embodiment is as follows: the support rod body 21 is divided into an upper support rod 211 and a lower support rod 212. A support rod reinforcing rib 213 is provided at the corner of the support rod body 21. The end of the upper support rod 211 is provided with a threaded hole, and the end of the connecting ring 22 is provided with a thread. The upper support rod 211 is threadedly connected to the end of the connecting ring 22. The outer surface of the lower support rod 212 is provided with a thread. The end of the connecting structure 23 is provided with a threaded hole, and the lower support rod 212 is threadedly connected to the connecting structure 23. In use, firstly, the lower support rod 212 is threadedly connected to the end of the connecting structure 23, and then the end of the connecting ring 22 is threadedly connected to one end of the upper support rod 211. This completes the initial assembly of the support structure 2. The support rod reinforcing rib 213 is used to strengthen the structural strength of the support structure 2.

[0025] Please see Figure 1 and Figure 4 A further solution based on this embodiment is as follows: the connecting structure 23 is a metal part that connects the glue groove 3 and the support rod body 21. The connecting structure 23 is fixedly connected to the glue groove 3 by four bolts. After the initial assembly of the support structure 2 is completed, the lower end of the connecting structure 23 is fitted with the groove edge of the glue groove 3. Then, the connecting structure 23 is fixed to the surface of the glue groove 3 with bolts. Thus, the installation of the support structure 2 is completed.

[0026] Working principle: When in use, first connect the lower part 212 of the support rod to the end of the connecting structure 23 by thread, and then connect the end of the connecting ring 22 to one end of the upper part 211 of the support rod by thread. This completes the initial assembly of the support structure 2.

[0027] After the initial assembly of the support structure 2 is completed, the lower end of the connecting structure 23 is fitted with the groove edge of the glue groove 3, and then the connecting structure 23 is fixed to the surface of the glue groove 3 with bolts. This completes the installation of the support structure 2.

[0028] After the support structure 2 is installed, the filter component 1 is installed. First, the filter screen 12 is placed into the inner groove of the filter 11. Then, the position of the filter screen 12 is continuously adjusted so that the filter screen 12 is fully adapted to the inner groove of the filter 11. After completion, multiple clips are used to fix the filter screen 12. This completes the assembly of the filter 11 and the filter screen 12.

[0029] The lower end of the inner groove of filter 11 is rounded, which increases the filtration area and indirectly increases the filtration rate.

[0030] After the filter 11 and filter screen 12 are assembled, the filter component 1 is then placed into the connecting ring 22. The connecting ring 22 is used to position the filter component 1. At this point, all installation steps are completed.

[0031] During filtration, one end of the return pipe is placed above the filter element 1. The filter screen 12 is used for the main filtration of yarn and wool, and the filter 11 itself is used for auxiliary filtration. With this filtration method, the device can also filter a certain amount of yarn and wool even without the filter screen 12. There is no gap period, which has higher flexibility of use and prevents some unfiltered resin from entering the glue tank 3 when the filter screen 12 is replaced.

[0032] Because the device is exposed, the fiber content inside the filter screen 12 can be directly observed during the filtration process. When the fiber content increases and the filtration speed slows down, the fiber content can be stirred to speed up the filtration process. The operation is convenient and quick.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A resin recirculation filtration structure, comprising a filter component (1) and a support structure (2), characterized in that: It also includes a filter (11) and a filter screen (12). The filter component (1) is composed of the filter (11) and the filter screen (12). A glue groove (3) is provided below the filter component (1). The support structure (2) includes a support rod body (21), a connecting ring (22) and a connecting structure (23). The support rod body (21) is the main support column. The connecting ring (22) is set at the upper end of the support rod body (21). The connecting structure (23) is set at the lower end of the support rod body (21). The connecting structure (23) is adapted to the groove edge of the glue groove (3). The connecting ring (22) is used to install the filter component (1). The connecting structure (23) is used to fix the support rod body (21).

2. The resin reflux filtration structure according to claim 1, characterized in that: The filter (11) has an open funnel-shaped structure. The lowest point of the filter (11) is projected onto the horizontal plane inside the glue tank (3). The filter screen (12) has a flexible mesh structure. The bottom of the inner tank of the filter (11) is an arc surface.

3. The resin reflux filtration structure according to claim 2, characterized in that: The main body of the support rod (21) is divided into an upper part (211) and a lower part (212). A support rod reinforcing rib (213) is provided at the corner of the main body of the support rod (21). The end of the upper part (211) of the support rod is provided with a threaded hole, and the end of the connecting ring (22) is provided with a thread. The upper part (211) of the support rod is threaded to the end of the connecting ring (22). The outer surface of the lower part (212) of the support rod is provided with a thread. The end of the connecting structure (23) is provided with a threaded hole, and the lower part (212) of the support rod is threaded to the connecting structure (23).

4. The resin reflux filtration structure according to claim 3, characterized in that: The connecting structure (23) is a metal part that connects the glue groove (3) and the support rod body (21). The connecting structure (23) is fixedly connected to the glue groove (3) by four bolts.

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