Resin blending device for automatic winding equipment

Abstract

The utility model relates to the technical field of resin blending equipment, in particular to a device for blending resin of automatic winding equipment, the upper end of a cover body is connected with a negative pressure device and a pneumatic motor, the pneumatic motor is connected with a stirring device, and the negative pressure device comprises a vacuum pump, an air pipe, an air pressure valve and a one-way electromagnetic valve; the vacuum pump is connected with the second connecting port through an air pipe and an air pressure valve, the one-way electromagnetic valve is connected with the third connecting port, the stirring device comprises a stirring shaft and multiple stages of stirring blades arranged on the stirring shaft, and the multiple stages of stirring blades comprise the first stirring blade and the second stirring blade; the negative pressure detection device is connected with the fourth connecting port, the gravity sensor is arranged at the bottom of the tank body, and a discharging port is formed in the bottom of the tank body and connected with a discharging valve. The device integrates resin blending, stirring, negative-pressure vacuumizing, degassing and positive-pressure resin conveying, so that the product quality and the production efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of resin mixing equipment technology, and specifically to a device for resin mixing in automated winding equipment. Background Technology

[0002] Fiberglass vertical storage tanks, also known as vertical FRP storage tanks or vertical tanks, are cylindrical tanks placed vertically with a flat bottom that fits snugly against the ground. The top is either an elliptical or conical head. A common type is the large raw material storage tank used in chemical plants. The structure consists of an inner lining layer, with the appropriate corrosion-resistant resin selected based on the type of medium being stored. An ultraviolet absorber is added to the outer layer to resist ultraviolet oxidation and corrosion, resulting in a service life of over 30 years. When storing strong acids, due to the excellent sealing of the FRP tank, changes in ambient temperature can affect the pressure inside the tank. Higher ambient temperatures increase the intermolecular spacing of the solution stored inside, generating high pressure and compromising the safe storage of the FRP tank.

[0003] In automated winding systems for FRP (fiberglass reinforced plastic) storage tanks, resin processing is the core technology. Wet winding requires the integration of a precision resin mixing, impregnation, and curing control system. If efficiency is the priority, a prepreg process or microwave curing technology can be used. The key is to shorten the production cycle and avoid downtime losses caused by gelation by synergistically optimizing resin, equipment, and process parameters (such as viscosity matching and curing kinetics control).

[0004] The negative pressure settling device creates a negative pressure environment, causing bubbles in the resin to expand and rise rapidly to the surface, thus accelerating degassing and effectively speeding up the escape and elimination of bubbles. This method achieves efficient degassing without high temperatures, avoiding negative impacts on resin performance, and has a wide range of applications, suitable for various resin systems, including epoxy resins, polyurethane resins, and vinyl resins.

[0005] Patent application CN202420033668.5 discloses a polyamic acid resin production line, which includes a No. 1 defoaming kettle, a No. 2 defoaming kettle, and a metering tank. All of these containers have a jacketed structure. The metering tank, No. 1 reaction kettle, and No. 2 reaction kettle are individually temperature-controlled by No. 1 mold temperature controller, No. 2 mold temperature controller, and No. 3 mold temperature controller, respectively. The No. 1 and No. 2 defoaming kettles are jointly temperature-controlled by No. 4 mold temperature controller. Although two-stage defoaming is achieved by adding two defoaming kettles, and the viscosity of the polyamic acid resin is reduced by heating the defoaming kettles, and air bubbles are eliminated by stirring and applying negative pressure to the polyamic acid resin within the defoaming kettles, the negative pressure defoaming process within the two defoaming kettles still requires a static defoaming operation of up to 6 hours. This prolonged static defoaming operation can easily lead to resin gelation. Utility Model Content

[0006] This invention provides a device for resin mixing in automated winding equipment, which solves the above-mentioned problems.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A device for resin mixing in automated winding equipment, comprising a tank, a negative pressure device, a stirring device, and a feeding mechanism. A cover is provided on the top of the tank, and a stirring device is provided inside the tank. The upper end of the cover is connected to the negative pressure device and a pneumatic motor. The pneumatic motor is connected to the stirring device. The negative pressure device includes a vacuum pump, an air pipe, a pressure valve, and a one-way solenoid valve. The vacuum pump is connected to a second connection port through the air pipe and the pressure valve. The one-way solenoid valve is connected to a third connection port. The stirring device includes a stirring shaft and multi-stage stirring blades arranged on the stirring shaft. The multi-stage stirring blades include a first stirring blade and a second stirring blade. It also includes a negative pressure detection device connected to a fourth connection port and a gravity sensor located at the bottom of the tank. A discharge port is provided at the bottom of the tank, and the discharge port is connected to a discharge valve.

[0008] As a preferred embodiment of the present invention, the cover includes a flat cover plate, a first connection port is located at the center of the flat cover plate, and the second, third, fourth, fifth, and sixth connection ports are arranged circumferentially around the first connection port with the axis of the first connection port as the center. Each of the second, third, fourth, fifth, and sixth connection ports is provided with a sealing protruding connector. The flat cover plate has connectors protruding outwards, and the connectors are arranged in a circumferential array on the flat cover plate. The bottom of the tank has a connection hole, and the connectors are connected to the connection hole via a tank wall fixing screw.

[0009] As a preferred embodiment of the present invention, the flat cover plate is provided with a capillary array on the side facing the bottom of the tank.

[0010] As a preferred embodiment of the present invention, the side of the cover facing the inside of the tank is parallel to the bottom surface of the tank, and the cover is a honeycomb sandwich composite material. A protruding L-shaped ring is provided at the connection between the cover and the tank, and a sealing ring is snapped onto the L-shaped ring. The tank is provided with a sealing groove corresponding to the L-shaped ring and the sealing ring.

[0011] As a preferred embodiment of the present invention, the first stirring blade and the second stirring blade are arranged sequentially from top to bottom on the stirring shaft, and the angle between the first stirring blade and the second stirring blade is not less than the tilt angle of the second stirring blade.

[0012] As a preferred embodiment of the present invention, both the first stirring blade and the second stirring blade are provided with irregularly distributed micropores.

[0013] As a preferred embodiment of the present invention, the stirring shaft includes a hollow inner cavity, and a piezoelectric ceramic sheet is embedded in the cavity wall of the hollow inner cavity, and the piezoelectric ceramic sheet is uniformly filled in the hollow inner cavity.

[0014] In summary, this utility model has the following beneficial effects.

[0015] 1. This device integrates resin preparation, stirring, negative pressure vacuuming, degassing, and positive pressure resin conveying, thereby improving product quality and production efficiency.

[0016] 2. By setting multiple stages of stirring blades on the stirring shaft, and by specifically setting the tilt angle structure of the first stirring blade and the second stirring blade, the tilt angle α of the first stirring blade is 45°~60°, which mainly generates negative pressure vortex to promote bubble aggregation; the tilt angle β of the second stirring blade is 15°~30°, which forms an upward force flow field to accelerate bubble migration.

[0017] 3. The optimized cover design features a flat plate type cover, which is simple in structure, easy to seal, and low in manufacturing cost, especially under high vacuum conditions. The flat plate makes it easier to install sealing rings, ensuring stable negative pressure, reducing the possibility of leakage, and thus maintaining a stable negative pressure environment. A capillary array is installed on the side of the flat plate facing the bottom of the tank, directly extracting the enriched air bubbles through the negative pressure siphon effect, shortening the waiting time for negative pressure settling, and avoiding resin gelation problems caused by excessive settling time.

[0018] 4. The stirring shaft 23 includes a hollow inner cavity, with piezoelectric ceramic plates embedded in the cavity wall, uniformly filling the hollow inner cavity. During the vacuum settling process, ultrasonic vibration is activated, causing cavitation effects inside the resin and disrupting the bubble attachment structure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the external structure of a resin mixing device for automated winding equipment according to the present invention.

[0021] Figure 2 This is a top view of a device for resin mixing in an automated winding machine according to the present invention.

[0022] Figure 3 for Figure 2 Cross-sectional view at point AA.

[0023] Figure 4 This is a block diagram showing the connection between the vacuum pump and the tank.

[0024] Figure 5 for Figure 3 A magnified view of the details at point B in the middle.

[0025] Figure 6 This is a schematic diagram showing the tilt angles of the first and second stirring blades.

[0026] In the diagram: 1. Vacuum pump, 2. Pneumatic motor, 3. Top cover locking handle, 4. Cover, 5. Tank body, 6. Tank wall fixing screw, 8. Discharge port, 10. Pressure valve, 17. First connection port, 18. Second connection port, 19. Third connection port, 20. Fourth connection port, 21. Fifth connection port, 22. Sixth connection port, 23. Stirring shaft, 24. First stirring blade, 25. Second stirring blade, 26. Gravity sensor, 27. Sealing protrusion connector, 28. Connector, 29. Connecting hole, 30. Capillary array, 31. L-shaped protruding ring, 32. Sealing ring, 33. Sealing groove, 34. Micropore, 35. Seventh connection port. Detailed Implementation

[0027] The technical solutions in the embodiments of this utility model will be clearly explained below with reference to the accompanying drawings. It should be understood that the term "before and after" is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation on the utility model.

[0028] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0029] The generation of air bubbles is a common problem in resin formulation. The presence of air bubbles can severely affect the performance and quality of resin products. Therefore, how to efficiently eliminate air bubbles in resin has become an important issue in the resin processing field. Negative pressure settling devices, as effective degassing equipment, utilize a negative pressure environment to accelerate the escape and elimination of air bubbles, and have received widespread attention and research in recent years.

[0030] During resin formulation, air bubbles are mainly generated from the following aspects:

[0031] 1. Introducing air through stirring. After the resin and curing agent are mixed, air will inevitably be introduced during the stirring process.

[0032] 2. Chemical reaction. Some resins release gas and form bubbles when stirred with a curing agent.

[0033] 3. Environmental factors. Changes in temperature and pressure can also lead to the formation of bubbles.

[0034] Traditional degassing methods mainly include natural settling, heating degassing, and mechanical vibration. However, these methods all have limitations. Natural settling is time-consuming and inefficient, making it difficult to meet the needs of industrial production. While heating the resin can accelerate bubble escape, the high temperature may adversely affect the resin's properties. Mechanical vibration of the stored resin has limited effect and may introduce new bubbles.

[0035] The negative pressure settling device creates a negative pressure environment, causing bubbles in the resin to expand and rise rapidly to the surface, thus accelerating degassing and effectively speeding up the escape and elimination of bubbles. This method achieves efficient degassing without high temperatures, avoiding negative impacts on resin performance, and has a wide range of applications, suitable for various resin systems, including epoxy resins, polyurethane resins, and vinyl resins.

[0036] See attached document Figure 1 To be continued Figure 6As shown, an apparatus for resin mixing in an automated winding machine includes a tank 5, a negative pressure device, a stirring device, and a feeding mechanism. A cover 4 is provided on the top of the tank 5, and a stirring device is provided inside the tank 5. The upper end of the cover 4 is connected to the negative pressure device and a pneumatic motor 2. The pneumatic motor 2 is connected to the stirring device. The negative pressure device includes a vacuum pump 1, an air pipe, a pressure valve 10, and a one-way solenoid valve. The one-way solenoid valve is not shown in the figure. A suitable one-way solenoid valve can be selected and connected according to those skilled in the art. The gas generated after stirring and standing defoaming in the device is discharged through the one-way solenoid valve. The cover 4 is provided with a first connection port 17, a second connection port 18, a third connection port 19, a fourth connection port 20, a fifth connection port 21, a sixth connection port 22, and a seventh connection port 35. The first connection port 17 is connected to the pneumatic motor 2. The stirring shaft 23 is connected to the output end of the pneumatic motor 2 and extends into the tank 5 through the first connection port 17. The fifth connection port 21 is the resin addition port, the sixth connection port 22 is the curing agent addition port, and the seventh connection port is the pressure relief port. The vacuum pump 1 is connected to the second connection port 18 through an air pipe and a pressure valve 10, and a one-way solenoid valve is connected to the third connection port 19. The stirring device includes a stirring shaft 23 and multi-stage stirring blades set on the stirring shaft 23. The multi-stage stirring blades include a first stirring blade 24 and a second stirring blade 25. Both the first stirring blade 24 and the second stirring blade 25 are fixed to the stirring shaft 23. The first stirring blade 24 generates a negative pressure vortex during stirring to promote bubble accumulation, and the second blade forms a lift flow field to accelerate bubble migration. It also includes a negative pressure detection device connected to the fourth connection port 20. In this embodiment, it is preferably a pressure gauge and a gravity sensor 26 located at the bottom of the tank body 5. The bottom of the tank body 5 is provided with a discharge port 8. The discharge port 8 is connected to a discharge valve. The discharge valve is not shown in the attached drawings. A suitable electronic discharge valve can be selected and connected according to those skilled in the art.

[0037] The cover 4 includes a flat cover plate, which is simple in structure, easy to seal, and low in manufacturing cost. This is important for maintaining a negative pressure environment, as complex geometries can lead to sealing difficulties, especially under high vacuum conditions. The flat cover plate makes it easier to install the sealing ring 32, ensuring stable negative pressure, reducing the possibility of leakage, and thus maintaining a stable negative pressure environment. At the same time, the flat cover plate may make it easier to install vents or suction devices, making the air bubble removal path more direct and preventing air bubble retention caused by the curved surface structure. The first connection port 17 is located at the center of the flat cover plate. The second connection port 18, the third connection port 19, the fourth connection port 20, the fifth connection port 21, and the sixth connection port 22 are all arranged in a circle around the axis of the first connection port 17. The second connection port 18, the third connection port 19, the fourth connection port 20, the fifth connection port 21, and the sixth connection port 22 are all provided with sealing protruding connectors 27. The cover 4 is provided with connectors 28 protruding outward. The connectors 28 are arranged in a circumferential array on the cover 4. The bottom of the tank 5 is provided with a connection hole 29. The bottom of the tank 5 is the bottom plate of the tank 5. The connectors are arranged in a circumferential array on the bottom plate of the tank 5 near the body of the tank 5. The connectors 28 are connected to the connection hole 29 through the tank wall fixing screw 6.

[0038] A capillary array 30 is provided on the side of the flat cover facing the bottom of the tank 5. The enriched air bubbles are directly extracted through the negative pressure siphon effect, shortening the waiting time of negative pressure settling and avoiding the problem of resin gelation due to excessive settling time.

[0039] The side of the cover 4 facing the inside of the tank 5 is parallel to the bottom surface of the tank 5. The cover 4 is a honeycomb sandwich composite material. In this embodiment, stainless steel + polyurethane core layer is preferred. The bending stiffness is improved by the honeycomb reinforcement structure, while the weight is reduced. The connection between the cover 4 and the tank 5 is provided with a protruding L-shaped protruding ring 31. A sealing ring 32 is snapped on the L-shaped protruding ring 31. The tank 5 is provided with a sealing groove 33 corresponding to the L-shaped protruding ring 31 and the sealing ring 32.

[0040] The first stirring blade 24 and the second stirring blade 25 are arranged sequentially from top to bottom on the stirring shaft 23. The angle between the first stirring blade 24 and the second stirring blade 25 is not less than the tilt angle of the second stirring blade 25. The tilt angle α of the first stirring blade is 45°~60°, which mainly generates negative pressure vortices to promote bubble aggregation; the tilt angle β of the second stirring blade is 15°~30°, which forms an upward force flow field to accelerate bubble migration.

[0041] Both the first stirring blade 24 and the second stirring blade 25 are provided with irregularly distributed micropores 34. During stirring, the resin generates high-frequency turbulence through the micropores 34, dispersing large bubbles into smaller bubbles, increasing their surface energy difference, and accelerating the expansion efficiency under negative pressure.

[0042] The stirring shaft 23 includes a hollow inner cavity, with piezoelectric ceramic plates embedded in the cavity wall, uniformly filling the hollow inner cavity. During the vacuum settling process, ultrasonic vibration is activated, causing cavitation within the resin and disrupting the bubble adhesion structure. However, it is important to control the vibration power density at 0.5-1 W / cm³ to prevent localized overheating of the resin and to reduce resin viscosity. Combined with the negative pressure environment, this improves the bubble elimination rate.

[0043] The specific working principle is as follows:

[0044] The barrel wall fixing screw 6 fixes the barrel wall 5 and the barrel bottom 7. During use, the top cover locking handle 3 locks the barrel wall 5 to form a sealed space. At this time, all the openings are closed. Open the feed valve (not shown in the attached diagram) and put the resin into the tank 5 through the fifth connection port 21. The one-way solenoid valve opens to release excess air in the container to maintain air pressure balance and ensure smooth resin feeding. After adding the set amount of resin, close the feed valve. The gravity sensor 26 monitors the weight in the tank 5 in real time. When the curing agent is added to the preset weight through the sixth connection port 22, the pneumatic motor 2 starts and drives the multi-stage stirring blades to rotate and stir the resin. Stirring is performed. After stirring, vacuum pump 1 is started to extract air through pressure valve 10. The pressure relief valve (not shown in the attached diagram) connected to the seventh connection port 35 can ensure that the negative pressure value in the container does not exceed the safe value. After the pressure gauge 15 reaches a certain value, the vacuuming is stopped. The stirred resin needs to be left to stand in this negative pressure environment until the air bubbles are eliminated. After the resin has been left to stand, positive pressure is injected through pressure valve 10. After the pressure gauge reading is positive, the discharge valve (not shown in the attached diagram) connected to the discharge port 8 is opened, and the resin escapes from the gas in the container. After the resin is taken out, the top cover locking handle 3 is unscrewed and the barrel wall 5 and the bottom of the barrel are removed for cleaning.

[0045] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. An apparatus for resin mixing in automated winding equipment, comprising a tank (5), a negative pressure device, a stirring device, and a feeding mechanism, wherein a cover (3) is provided on the top of the tank (5), a stirring device is provided inside the tank (5), the upper end of the cover (3) is connected to the negative pressure device and a pneumatic motor (2), and the pneumatic motor (2) is connected to the stirring device, characterized in that, The negative pressure device includes a vacuum pump (1), an air pipe, a pressure valve (10), and a one-way solenoid valve. The vacuum pump (1) is connected to the second connection port through the air pipe and the pressure valve (10). The one-way solenoid valve is connected to the third connection port (19). The stirring device includes a stirring shaft (23) and multi-stage stirring blades arranged on the stirring shaft (23). The multi-stage stirring blades include a first stirring blade (24) and a second stirring blade (25). It also includes a negative pressure detection device connected to the fourth connection port (20) and a gravity sensor (26) located at the bottom of the tank (5). The bottom of the tank (5) is provided with a discharge port (8), which is connected to a discharge valve.

2. The apparatus for resin mixing in automated winding equipment according to claim 1, characterized in that, The cover (3) includes a flat cover plate. The first connection port (17) is located at the center of the flat cover plate. The second connection port, the third connection port (19), the fourth connection port (20), the fifth connection port (21) and the sixth connection port (22) are all arranged in a circle around the first connection port (17) with the axis of the first connection port (17) as the center. The second connection port, the third connection port (19), the fourth connection port (20), the fifth connection port (21) and the sixth connection port (22) are all provided with sealing protruding connectors (27). The cover (3) is provided with connectors (28) protruding outward. The connectors (28) are arranged in a circumferential array on the cover (3). The bottom of the tank (5) is provided with a connection hole (29). The connectors are connected to the connection hole (29) through the barrel wall fixing screw (6).

3. The apparatus for resin mixing in automated winding equipment according to claim 2, characterized in that, The flat cover plate is provided with a capillary array (30) on the side facing the bottom of the tank (5).

4. The apparatus for resin mixing in automated winding equipment according to claim 3, characterized in that, The side of the cover (3) facing the inside of the tank (5) is parallel to the bottom surface of the tank (5). The cover (3) is a honeycomb sandwich composite board. The connection between the cover (3) and the tank (5) is provided with a protruding L-shaped protruding ring (31). A sealing ring (32) is snapped onto the L-shaped protruding ring (31). The tank (5) is provided with a sealing groove (33) corresponding to the L-shaped protruding ring (31) and the sealing ring (32).

5. The apparatus for resin mixing in automated winding equipment according to claim 4, characterized in that, The first stirring blade (24) and the second stirring blade (25) are arranged sequentially from top to bottom on the stirring shaft (23), and the angle between the first stirring blade (24) and the second stirring blade (25) is not less than the tilt angle of the second stirring blade (25).

6. The apparatus for resin mixing in automated winding equipment according to claim 5, characterized in that, Both the first stirring blade (24) and the second stirring blade (25) are provided with irregularly distributed micropores (34).

7. The apparatus for resin mixing in automated winding equipment according to claim 6, characterized in that, The stirring shaft (23) includes a hollow inner cavity, and a piezoelectric ceramic sheet is embedded in the cavity wall of the hollow inner cavity. The piezoelectric ceramic sheet is uniformly filled in the hollow inner cavity.

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