Coupling glass fiber reinforced plastic coating device and coating method

Abstract

The invention relates to the technical field of forming of composite materials, in particular to a coupling glass fiber reinforced plastic coating device and method. A coupling glass fiber reinforced plastic coating device comprises a vacuum bag which is used for being wound on the peripheral face of a coupling to form a closed space on the periphery of the coupling, at least two openings are formed in the vacuum bag, and the coating device further comprises a vacuum pump which is connected with an exhaust pipeline and used for exhausting air in the space in the vacuum bag. The liquid inlet pipeline is connected with a container for containing a resin matrix, a stop valve is arranged on the liquid inlet pipeline between the container and the vacuum bag, an inlet of the vacuum bag is arranged at the bottom of the coupling, and an outlet of the vacuum bag is arranged at the top of the coupling. The problems that in the prior art, after a reinforcing material is soaked in resin and then wound on the outer surface of the coupling to form glass fiber reinforced plastic, glass fiber reinforced plastic forming is poor, air holes easily exist, and then using performance is affected are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material forming, and particularly to a coupling glass fiber reinforced plastic (GFRP) coating device and a coating method. Background Art

[0002] The ship power plant is the heart of a ship. The ship shafting is the general term for a set of equipment from the output end of the main engine or transmission equipment to the propeller. It generally includes a propeller shaft, a stern shaft, an intermediate shaft, bearings, and shafting accessories, etc. Among them, the installation of the propeller shaft and the stern shaft usually uses a sleeve-type hydraulic coupling for connection and installation. In order to prevent the surface of the sleeve-type hydraulic coupling from being corroded, GFRP is usually coated on the outer surface.

[0003] GFRP is composed of a reinforcing material and a resin matrix. The reinforcing material is often glass fiber or other fiber materials, and the resin matrix is often in a liquid state before curing. In the prior art, the formation of GFRP on the outer peripheral surface of the coupling is often to soak the reinforcing material in the resin matrix. After the outer surface of the reinforcing material adheres to the resin matrix, the fibrous reinforcing material is wound around the outer surface of the coupling according to certain rules, and then wait for the resin matrix to cure to form GFRP wrapped around the outer peripheral surface of the coupling.

[0004] In the above technical solution, during the winding process of the reinforcing material, air may be wound in to form tiny bubbles, resulting in poor GFRP formation and easy presence of pores on the surface, increasing the water flow resistance during the operation of the shafting and other problems. Summary of the Invention

[0005] In view of this, the present invention provides a coupling GFRP coating device to solve the problems in the prior art that the GFRP formed by soaking the reinforcing material in the resin and then winding it around the outer surface of the coupling has poor formation and is prone to pores, thus affecting the service performance; the present invention also provides a coupling GFRP coating method to solve the above technical problems.

[0006] A coupling GFRP coating device includes a vacuum bag for winding around the outer peripheral surface of the coupling to form a sealed space on the outer periphery of the coupling. At least two openings are provided on the vacuum bag. Some of the openings are connected to a liquid inlet pipe to form an inlet, and some of the other openings are connected to an exhaust pipe to form an outlet. The coating device further includes a vacuum pump connected to the exhaust pipe for evacuating the space inside the vacuum bag. A liquid storage container for containing the resin matrix is connected to the liquid inlet pipe. A stop valve is provided on the liquid inlet pipe between the liquid storage container and the vacuum bag. The inlet of the vacuum bag is used to be arranged at the bottom of the coupling, and the outlet of the vacuum bag is arranged at the top of the coupling.

[0007] Further, the inlet of the vacuum bag is arranged at the central position of the covered coupling, and there are three outlets of the vacuum bag. Two of them are respectively arranged at both ends of the covered coupling, and the other is arranged at the central position of the covered coupling.

[0008] Further, a collection bucket is also arranged on the exhaust pipeline. The collection bucket is respectively provided with an air inlet and an air outlet. The exhaust pipeline is arranged in sections. The air inlet is connected to the outlet of the vacuum bag through the exhaust pipeline, and the air outlet is connected to the vacuum pump through the exhaust pipeline.

[0009] Further, an observation window is arranged on the collection bucket.

[0010] Further, the inlet of the liquid inlet pipeline is inserted into the bottom of the containing container, and a balance port for admitting air to maintain the pressure balance in the containing container is also opened on the containing container.

[0011] The beneficial effects of the coupling fiberglass coating device in the present invention are as follows: By setting the vacuum bag in the present invention, it is convenient to form a sealed space between the coupling and the vacuum bag. Then, an inlet and an outlet are opened on the vacuum bag, that is, an inlet and an outlet are opened in the sealed space, which is convenient for exhausting the gas in the sealed space and pouring the resin matrix. Through the setting of the vacuum pump and the exhaust pipeline, it is convenient to evacuate the sealed space. Through the setting of the containing container and the liquid inlet pipeline, it is convenient for the resin matrix to flow into the sealed space. Through the setting of the stop valve, it is convenient to close or open the inlet of the sealed space. That is to say, the stop valve can be closed first, and the sealed space can be evacuated to the set pressure, and then the stop valve is opened. Naturally, the resin matrix can directly flow into the sealed space under the action of negative pressure and then be formed into fiberglass. Since the gas is exhausted by evacuating the vacuum in advance, the generation of bubbles can be reduced. And because of vacuum suction, the pressure is the same everywhere, which is convenient to improve the uniformity of molding. By setting the inlet at the bottom and the outlet at the top, the resin matrix can only flow in the sealed space by relying on negative pressure, which further improves the molding quality. Thus, the problems in the prior art that the fiberglass formed by winding the reinforcing material around the outer surface of the coupling after infiltrating the resin is poorly formed and prone to pores, which affects the service performance, are solved.

[0012] A method for coating a coupling with fiberglass. First, clean the coupling and wind the reinforcing material outside the coupling. Then, wrap a vacuum bag outside the reinforcing material to form a sealed space between the outer surface of the coupling and the vacuum bag. Then, open an opening at the lower part of the vacuum bag for connecting the exhaust pipeline for exhausting air and an opening at the upper part for connecting the liquid inlet pipeline for pouring the resin matrix. Then, keep the liquid inlet pipeline closed and evacuate the sealed space so that the pressure of the sealed space drops to the set value. Finally, open the liquid inlet pipeline so that the resin matrix is poured into the sealed space to form fiberglass.

[0013] Further, after winding the reinforcing material around the coupling and then wrapping the flow guiding net and the demolding cloth around the reinforcing material, the vacuum bag is wound.

[0014] Further, when winding the reinforcing material around the coupling, the coupling is kept rotating at a constant speed.

[0015] Further, a collection bucket is connected to the exhaust pipe, and when the resin matrix flows out stably from the exhaust pipe, the air extraction is stopped.

[0016] The beneficial effects of the method for wrapping the coupling with fiberglass in the present invention are as follows: In the method for wrapping the coupling with fiberglass in the present invention, first, the coupling is cleaned to facilitate the subsequent fiberglass molding operation; by winding the reinforcing material, it is convenient to provide a foundation for the molding of the resin matrix; by including the vacuum bag, it is convenient to form a closed space for fiberglass molding, and by opening an opening on the vacuum bag, it is convenient for the gas in the closed space to flow out and the resin matrix to flow in; by keeping the liquid inlet pipe closed and extracting air, it is convenient to reduce the pressure value in the closed space to the set value, and then when the stop valve is opened, the resin matrix can be sucked into the closed space under the action of negative pressure. Since the air is exhausted before sucking the resin matrix, the formation of bubbles can be greatly reduced. And since the inlet in the closed space is located at the bottom of the outlet, the flow of the resin matrix can only rely on the action of negative pressure, improving the molding quality, and thus solving the problem in the prior art that when the reinforcing material is impregnated with resin and then wound on the outer surface of the coupling to form fiberglass, the fiberglass molding is poor and there are easily pores, which affects the service performance. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of the device for wrapping the coupling with fiberglass in the present invention;

[0019] Figure 2 It is in the present invention Figure 1 Partial enlarged view of part A.

[0020] The meanings of the reference numerals in the drawings are as follows: 1, vacuum pump; 2, collection bucket; 3, vacuum bag; 4, demolding cloth; 5, flow guiding net; 61, first exhaust pipe; 62, second exhaust pipe; 63, liquid inlet pipe; 7, reinforcing material; 8, vacuum pressure gauge; 9, stop valve; 10, injection bucket; 11, hydraulic coupling; 12, propeller shaft; 13, stern shaft. Detailed implementation mode

[0021] To make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0022] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms "a", "said" and "the" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0023] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0024] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation to the present invention.

[0025] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "installation", "connection" and "coupling" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two elements. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms may be understood according to specific circumstances.

[0026] In the subsequent description, the use of suffixes such as "module", "component" or "unit" for indicating elements is only for the convenience of the description of the present invention, and they do not have specific meanings themselves. Therefore, "module" and "component" can be used interchangeably.

[0027] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0028] In Embodiment 1 of the coupling fiberglass coating device (hereinafter referred to as the coating device) of the present invention:

[0029] The coating device in the present invention is used to provide a sealed space during the molding of fiberglass. The resin matrix is filled in the sealed space, and the impregnation of the reinforcing material is no longer carried out, so as to avoid the performance degradation of the fiberglass caused by the synchronous winding of air bubbles inside when the reinforcing material is wound. Specifically, in this embodiment, after the winding of the reinforcing material is completed, the resin matrix is directly sucked into the sealed space by negative pressure through vacuum pumping in the sealed space for the molding of fiberglass.

[0030] Specifically, as Figure 1 shown, the coating device includes a vacuum bag 3 for winding around the outer peripheral surface of the coupling to form a sealed space on the outer periphery of the coupling. The sealed space is located between the vacuum bag 3 and the outer surface of the coupling. The material of the vacuum bag 3 is a copolymer, and a normal temperature or medium temperature type is selected. The main purpose is to isolate air and prevent air from entering the fiber product during vacuum pumping. Naturally, to carry out the molding of fiberglass in this sealed space, it is necessary to fill the reinforcing material 7 and the resin matrix in this sealed space. The reinforcing material 7 can be wound around the outer peripheral surface of the coupling before the vacuum bag 3 is wrapped, while the resin matrix can only be filled after the vacuum bag 3 is wrapped around the outer peripheral surface of the coupling. Therefore, at least two openings are provided on the vacuum bag 3. One part of the openings is connected to the liquid inlet pipe 63 to form an inlet, and the other part of the openings is connected to the exhaust pipe to form an outlet. It should be noted that the inlet and outlet are only reflected after connecting the corresponding pipes to achieve the corresponding functions.

[0031] In order to evacuate the sealed space, an exhaust pipe is connected to the outlet of the vacuum bag 3, and a vacuum pump 1 is also connected to the exhaust pipe. The sealed space is evacuated by the suction of the vacuum pump 1. In order to facilitate the feeding of the sealed space and enable the resin matrix and the reinforcing material 7 to be combined together, a liquid inlet pipe 63 is connected to the inlet of the vacuum bag 3. A container for containing the resin matrix is provided on the liquid inlet pipe 63. That is, a negative pressure is created in the sealed space by the vacuum pump 1, and the resin matrix is sucked from the container into the sealed space by negative pressure and combined with the reinforcing material 7 to form fiberglass. In this embodiment, the container is an injection barrel 10.

[0032] The injection barrel 10 has two openings. One opening is for the liquid inlet pipe 63 to be inserted, and the other opening is used to communicate with the atmosphere to facilitate the pressure balance inside the injection barrel 10. This opening is also denoted as the balance port of the injection barrel 10. The liquid inlet pipe 63 is inserted into the bottom of the injection barrel 10 and is in direct contact with the resin matrix, facilitating the suction of the resin matrix. When a negative pressure is formed in the closed space, the pressure inside the injection barrel 10 is normal. Therefore, the resin matrix inside the injection barrel 10 will enter the closed space through the liquid inlet pipe 63, and the missing part of the volume due to the departure of the resin matrix is supplemented through the balance port, so that the injection barrel 10 is always in an atmospheric pressure state, thus continuously supplying the resin matrix to the closed space.

[0033] In order to achieve the entry of the resin matrix and the discharge of gas, the inlet of the vacuum bag 3 is arranged at the bottom of the coupling, and the outlet of the vacuum bag 3 is arranged at the top of the coupling. Thus, the flow of the resin matrix in the closed space can only rely on negative pressure, making the flow of each part balanced and improving the molding effect. In addition, it is impossible to ensure that there is no gas in the closed space during vacuum pumping. Setting the outlet at the top of the coupling can facilitate the concentration of the remaining gas at the top, and finally it is uniformly discharged by the exhaust pipe, further reducing the possible bubbles mixed in the fiberglass.

[0034] The vacuum pump 1 can pump air from the closed space. In this embodiment, a stop valve 9 and a vacuum pressure gauge 8 are also arranged on the liquid inlet pipe 63. The closed space can be closed through the stop valve 9. When the vacuum pump 1 pumps air, first close the stop valve 9. At this time, the pressure in the closed space will continuously decrease. According to the reading of the vacuum pressure gauge 8, it is reduced to the preset value. At this time, the gas content in the closed space is extremely small. Then open the stop valve 9. Under the action of the negative pressure in the closed space, the resin matrix in the injection barrel 10 will flow into the closed space. Since a large amount of gas has been discharged, the problem of bubbles remaining in the fiberglass due to the mixing of the resin matrix and air after the resin matrix enters is reduced. It should be noted that both the exhaust pipe and the liquid inlet pipe 63 are spiral polyester pipes, which are placed at the end of the reinforcing material, assisting in conducting air during air extraction and conducting resin during pouring.

[0035] At the end of the evacuation process, there may be no gas left in the sealed space. At this time, the resin matrix will enter the exhaust pipe. If the exhaust pipe is directly connected to the vacuum pump 1, it will directly enter the vacuum pump 1 and cause damage to the vacuum pump 1. Therefore, the exhaust pipe is set in sections, and a collection bucket 2 is also provided between the two sections of the exhaust pipe. Specifically, the exhaust pipe between the collection bucket 2 and the vacuum pump 1 is denoted as the first exhaust pipe 61, and the exhaust pipe between the collection bucket 2 and the sealed space is denoted as the second exhaust pipe 62. Both the first exhaust pipe 61 and the second exhaust pipe 62 are inserted into the collection bucket 2. The first exhaust pipe 61 is connected to the exhaust port of the collection bucket 2, and the second exhaust pipe 62 is connected to the inlet port of the collection bucket 2. When there is resin matrix in the second exhaust pipe 62, it will flow into the collection bucket 2, while keeping the first exhaust pipe 61 always filled with gas, thus protecting the vacuum pump 1. In addition, the filling progress can be judged by whether there is resin matrix in the second exhaust pipe 62. An observation window is provided on the collection bucket 2. If it is observed that the resin matrix flows out stably from the second exhaust pipe 62, it proves that the sealed space is already filled with resin matrix, and at this time, the evacuation can be stopped.

[0036] As Figure 1 and Figure 2 shown, after the molding is completed, the vacuum bag 3 needs to be removed. To facilitate the removal of the vacuum bag 3, a demolding cloth 4 for facilitating the separation of the two is also provided between the vacuum bag 3 and the fiberglass to be molded. In addition, when evacuating the sealed space, the vacuum bag 3 will be tightly pressed against the reinforcing material 7, which is not conducive to the flow of resin and air. Therefore, a flow guide net 5 is also provided. Specifically, the demolding cloth 4 is made of high-strength polyester fiber plain cloth with tracer lines, and is subjected to degreasing and heat setting treatments. It is laid on top of the fiberglass cloth and outside the flow guide net 5. After the wrapping molding, the relevant vacuum evacuation auxiliary materials can be conveniently removed without sticking to the product. Finally, by tearing off the demolding cloth 4, a smooth and flat production surface can be obtained. The flow guide net 5 is a polyethylene woven net with a good three-dimensional structure; it allows air to pass through during evacuation and allows the resin matrix to pass through during perfusion, accelerating the running speed of the resin matrix in the reinforcing material. The flow guide net 5 should have a certain thickness, with low resistance to resin and good laying performance.

[0037] Specifically, when performing FRP cladding, first clean the outer periphery of the coupling to be clad with FRP to ensure the adhesion during FRP cladding. Then control the coupling to rotate at a constant speed. Next, wind the reinforcing material 7 around the outer peripheral surface of the coupling in a specific winding direction. After winding, when the reinforcing material 7 has wound a sufficient thickness on the surface of the coupling, stop the rotation of the coupling. At this time, the basic construction of the FRP has been completed. After that, cover the outer surface of the reinforcing material 7 with a flow guiding net 5, cover the outer surface of the flow guiding net 5 with a demolding cloth 4, wind a vacuum bag 3 around the outer surface of the demolding cloth 4, and open an inlet and an outlet on the vacuum bag 3. Connect a liquid inlet pipe 63 to the inlet and an exhaust pipe to the outlet. Since vacuum pumping will be carried out later, it is necessary to ensure the sealing of the vacuum bag 3. Close the stop valve 9, turn on the vacuum pump 1 to pump the vacuum bag 3, and observe the reading of the vacuum pressure gauge 8 to judge whether the pressure reaches the preset value. When the pressure in the closed space reaches the preset value, open the stop valve 9 so that the resin matrix in the injection barrel 10 can enter the closed space through the liquid inlet pipe 63 and combine with the reinforcing material 7. Then wait for the resin matrix to cure, and the construction of the FRP is completed. Finally, remove the vacuum bag 3, the flow guiding net 5, and the demolding cloth 4, and finish the outer surface of the FRP by trimming, grinding burrs, and painting.

[0038] In the embodiment of the coupling FRP cladding method in the present invention:

[0039] The cladding method in this embodiment takes the embodiment of the above FRP cladding device as an example. Specifically, the cladding method in this embodiment is the same as the usage method of the above FRP cladding device, and will not be repeated here.

[0040] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. A coupling fiberglass coating device, comprising a vacuum bag for winding around the outer peripheral surface of the coupling to form a closed space around the coupling, the vacuum bag is provided with at least two openings, part of the openings are connected to a liquid inlet pipe to form an inlet, and the other part of the openings are connected to an exhaust pipe to form an outlet, the coating device also includes a vacuum pump connected to the exhaust pipe for evacuating the space in the vacuum bag, the liquid inlet pipe is connected to a container for containing a resin matrix, characterized in that: A stop valve is arranged on the liquid inlet pipeline between the containing container and the vacuum bag, the inlet of the vacuum bag is arranged at the bottom of the coupling, and the outlet of the vacuum bag is arranged at the top of the coupling.

2. The coupling fiberglass reinforced plastic covering device according to claim 1 is characterized in that: The inlet of the vacuum bag is arranged at the center of the covered coupling, and three outlets of the vacuum bag are arranged, two of which are arranged at the two ends of the covered coupling respectively, and the other is arranged at the center of the covered coupling.

3. The coupling fiberglass reinforced plastic covering device according to claim 1 or 2, characterized in that: A collecting barrel is also provided on the exhaust pipe, and the collecting barrel is respectively provided with an air inlet and an exhaust port. The exhaust pipe is arranged in sections, the air inlet is connected to the outlet of the vacuum bag through the exhaust pipe, and the exhaust port is connected to the vacuum pump through the exhaust pipe.

4. The coupling fiberglass reinforced plastic covering device according to claim 3 is characterized in that: The collecting barrel is provided with an observation window.

5. The coupling fiberglass reinforced plastic covering device according to claim 1 or 2, characterized in that: The inlet of the liquid inlet pipe is inserted into the bottom of the containing container, and the containing container is also provided with a balancing port for air intake to maintain the pressure in the containing container.

6. A method for coating a coupling with glass fiber reinforced plastics, characterized in that: First, clean the coupling and wrap the reinforcing material around the outside of the coupling, then wrap the vacuum bag around the outside of the reinforcing material to form a closed space between the outer surface of the coupling and the vacuum bag, then open an opening at the bottom of the vacuum bag to connect an exhaust pipe for exhaust and open an opening at the top to connect a liquid inlet pipe for pouring a resin matrix, then keep the liquid inlet pipe closed and evacuate the closed space to reduce the pressure of the closed space to a set value, and finally open the liquid inlet pipe to allow the resin matrix to be poured into the closed space to form fiberglass.

7. The method for coating a shaft coupling with glass fiber reinforced plastics according to claim 6, characterized in that: After the reinforcing material is wound around the outside of the coupling, the guide net and the demoulding cloth are wrapped around the outside of the reinforcing material, and then the vacuum bag is wound.

8. The method for coating a shaft coupling with glass fiber reinforced plastic according to claim 6 or 7, characterized in that: Keep the coupling rotating at a constant speed while wrapping the reinforcing material around the outside of the coupling.

9. The method for coating a shaft coupling with glass fiber reinforced plastic according to claim 6 or 7, characterized in that: Connect a collection bucket to the exhaust pipe, and stop pumping when the resin matrix flows out of the exhaust pipe steadily.

Images