High-pressure resin transfer molding system and method suitable for thermosetting resin

Abstract

The high-pressure resin transfer molding system comprises a pressure injection device, a mixing device and a molding device, a discharge port of the pressure injection device is connected with a feed port of the mixing device through a first pipeline, and a discharge port of the mixing device is connected with a feed port of the molding device through a second pipeline; a cleaning device is arranged at the discharge hole of the mixing device and is connected with the first pipeline through a pipeline; and a molding method. A normal-temperature pressure injection and thermocuring mode is adopted, and the pressure injection device is connected with the mixing device through the first pipeline, so that liquid resin and a curing agent can be independently conveyed and mixed and are directly injected into the molding device through the second pipeline for high-pressure thermocuring, and the shrinkage rate is effectively reduced; and the cleaning device is arranged to directly perform dead-corner-free cleaning from the first pipeline after molding is completed.

Description

Technical Field

[0001] The invention relates to the field of molding technology, and in particular to a high-pressure resin transfer molding system and method suitable for thermosetting resin. Background Art

[0002] Resin transfer molding is a process in which resin is injected into a closed mold to infiltrate the reinforcing material and solidify. This technology does not require prepregs and autoclaves, effectively reducing equipment costs and molding costs. This technology has developed rapidly in recent years and is increasingly widely used in the fields of aircraft industry, automobile industry, shipbuilding industry, etc.

[0003] At present, the raw materials generally used for resin transfer molding products include resin system, reinforcement material and filler. The resin used in the resin transfer molding process of the resin system is mainly unsaturated polyester resin (thermoplastic), which is usually not used in scenes that require high temperature resistance and organic solvent resistance. After demolding, the thermoplastic product needs to be shaped and cooled on a customized cooling tooling to ensure that it does not deform due to lack of support before the temperature cools down. There is volume shrinkage during the cooling process, resulting in low precision of the finished resin product. Moreover, after the molding is completed, it is necessary to use a heating pipe to melt the solidified resin in the pipe and then clean it. Cleaning is more difficult and energy consumption is high.

[0004] Therefore, the current thermoplastic resin transfer molding method requires hot melting and conveying and cooling and solidification, which results in a large shrinkage rate of the product after solidification, affecting the product precision. In addition, the resin in the pipeline is easy to cool and solidify, and it is necessary to maintain a high temperature at all times for easy cleaning, resulting in excessive production energy consumption. Summary of the invention

[0005] The purpose of the present invention is to provide a high-pressure resin transfer molding system and method suitable for thermosetting resins, so as to solve the technical problems in the prior art that hot melting transportation and cooling solidification are required, resulting in a large shrinkage rate of the product after solidification, affecting the product precision, and the resin in the pipeline is easy to cool and solidify, and it is necessary to maintain a high temperature at all times for easy cleaning, resulting in excessively high production energy consumption.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A high-pressure resin transfer molding system suitable for thermosetting resins, comprising an injection device, a mixing device and a molding device, wherein a first pipeline connection is provided between a discharge port of the injection device and a feed port of the mixing device, and a second pipeline connection is provided between a discharge port of the mixing device and a feed port of the molding device;

[0008] The injection device delivers the liquid resin and the liquid curing agent to the mixing device through the first pipeline to be uniformly mixed into a mixed resin, and the mixing device delivers the mixed resin to the mold cavity of the molding device through the second pipeline for heating and curing;

[0009] Wherein, a cleaning device is provided at the discharge port of the mixing device, and the cleaning device is connected to the first pipeline through a pipeline, and is used for injecting a cleaning agent into the first pipeline to flush the first pipeline, the mixing device, the second pipeline and the molding device after the mixing device stops discharging and injecting.

[0010] As a preferred solution of the present invention, the injection device comprises a first injection cylinder and a second injection cylinder, and the first injection cylinder and the second injection cylinder are both provided with a plunger push rod, and the plunger push rod can reciprocate;

[0011] Wherein, when the plunger push rod on the first injection cylinder is working, the feed port of the first injection cylinder draws liquid resin from the outside, or the discharge port thereof delivers liquid resin to the mixing device through the first pipeline;

[0012] When the plunger push rod on the second injection cylinder is working, the feed port of the second injection cylinder draws in liquid curing agent from the outside, or the discharge port thereof delivers liquid curing agent to the mixing device through the first pipeline.

[0013] As a preferred solution of the present invention, a driving assembly is provided at the end of the first injection cylinder and the second injection cylinder, and the output end of the driving assembly is connected to the plunger push rod and can drive the plunger push rod to reciprocate along its axis in the first injection cylinder or the second injection cylinder.

[0014] As a preferred solution of the present invention, flow controllers are provided at the discharge ports of the first injection cylinder and the second injection cylinder, filters are provided at the feed ports of the first injection cylinder and the second injection cylinder, and the first pipeline is installed at the outlet end of the flow controller.

[0015] As a preferred solution of the present invention, the first pipeline includes a first delivery pipe and a second delivery pipe, the first delivery pipe is connected to the outlet end of the flow controller on the first injection cylinder, and the second delivery pipe is connected to the outlet end of the flow controller of the second injection cylinder;

[0016] Wherein, a valve is commonly provided at the ends of the first conveying pipe and the second conveying pipe away from the flow controller, and the valve is connected to the mixing device to guide the liquid resin and liquid curing agent transported by the first conveying pipe and the second conveying pipe to converge into the mixing device for mixing.

[0017] As a preferred solution of the present invention, the mixing device includes a static turbulent mixer, the feed end of the static turbulent mixer is connected to the confluence end of the valve member, and the discharge end of the static turbulent mixer is connected to the second pipeline.

[0018] As a preferred solution of the present invention, the second pipeline includes a mixing tube, one end of which is connected to the discharge end of the static turbulent mixer, and the other end of the mixing tube is provided with a check valve, and the discharge end of the check valve is provided with a glue injection pipeline, and the end of the glue injection pipeline away from the check valve is connected to the molding device.

[0019] As a preferred solution of the present invention, the cleaning device comprises a cleaning agent tank, a high-pressure pump is provided on the cleaning agent tank, a negative pressure end of the high-pressure pump is connected to a discharge port of the cleaning agent tank, and a cleaning pipe is provided at a positive pressure end of the high-pressure pump, and the cleaning pipe is connected to the valve member;

[0020] Wherein, the valve member can selectively connect the cleaning pipe and the static turbulent mixer, or the static turbulent mixer and the first conveying pipe and the second conveying pipe.

[0021] As a preferred solution of the present invention, the molding device comprises an upper mold assembly and a lower mold assembly, the bottom of the upper mold assembly is provided with an upper mold groove, the upper surface of the lower mold assembly is provided with a lower mold groove, and after the upper mold assembly and the lower mold assembly are molded together, the upper mold groove and the lower mold groove constitute a mold cavity;

[0022] A plurality of injection channels are arranged on the upper mold assembly and the lower mold assembly, the injection pipeline has a plurality of injection ports, and each injection port of the injection pipeline is provided with a glue injection gun head, and each of the injection gun heads is detachably mounted on the upper mold assembly and the lower mold assembly, and connected to the corresponding plurality of injection channels;

[0023] Wherein, heating components are also embedded inside the upper mold component and the lower mold component.

[0024] In order to solve the above technical problems, the present invention further provides the following technical solutions:

[0025] A molding method using the above-mentioned high pressure resin transfer molding system suitable for thermosetting resin comprises the following steps:

[0026] Step 100, placing the prefabricated insert on the skeleton of the prefabricated fiber material, and placing the prefabricated fiber material into a mold of a molding device for mold closing, so that the prefabricated insert and the prefabricated fiber material are fixed in the mold cavity;

[0027] Step 200: The injection device delivers liquid resin and liquid curing agent to the mixing device through the first pipeline. After the liquid resin and liquid curing agent are uniformly mixed in the mixing device, they are injected into the mold cavity of the mold of the molding device through the second pipeline, so that the mixed resin infiltrates the prefabricated fiber material and the prefabricated insert;

[0028] Step 300: The molding device heats the mold to rapidly solidify the mixed resin in the mold cavity, and after a set solidification time, the mold is cooled and the mold is opened for demoulding;

[0029] Step 400: After pausing molding, the cleaning device starts automatically and pumps cleaning agent into the first pipeline to clean the first pipeline, the mixing device, the second pipeline and the molding device.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention adopts a room temperature injection heat curing method, and an injection device is arranged to connect a mixing device through a first pipeline, so that the liquid resin and the curing agent can be independently transported and mixed, and directly injected into the molding device through the second pipeline for high-pressure heat curing, which effectively reduces the shrinkage rate, and a cleaning device is arranged to perform dead-angle cleaning directly from the first pipeline after molding is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0033] Figure 1 A schematic structural diagram of a high pressure resin transfer molding system applicable to thermosetting resins provided in an embodiment of the present invention;

[0034] Figure 2 A schematic structural diagram of a high pressure resin transfer molding system applicable to thermosetting resins provided in an embodiment of the present invention;

[0035] Figure 3 A schematic structural diagram of a high pressure resin transfer molding system applicable to thermosetting resins provided in an embodiment of the present invention;

[0036] Figure 4 A schematic structural diagram of a high pressure resin transfer molding system applicable to thermosetting resins provided in an embodiment of the present invention;

[0037] Figure 5 A schematic structural diagram of a high-pressure resin transfer molding system suitable for thermosetting resin provided in an embodiment of the present invention.

[0038] The numbers in the figure represent the following:

[0039] 1-first injection cylinder; 2-second injection cylinder; 3-plunger push rod; 4-driving assembly; 5-flow controller; 6-filter; 7-first delivery pipe; 8-second delivery pipe; 9-valve; 10-static turbulent mixer;

[0040] 11-mixing tube; 12-check valve; 13-glue injection pipeline; 14-cleaning agent tank; 15-high pressure pump; 16-cleaning pipe; 17-glue injection gun head; 18-injection flow channel; 19-upper mold assembly; 20-lower mold assembly; 21-upper mold groove; 22-lower mold groove;

[0041] 41-turntable; 42-eccentric shaft; 43-driving connecting rod; 44-power gear; 45-transmission gear; 46-hydraulic push rod;

[0042] 91-valve body; 92-first flow channel; 93-second flow channel; 94-third flow channel; 95-fourth flow channel; 96-ball core; 97-first channel; 98-second channel;

[0043] 411-slideway; 412-slider. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figure 1 As shown, the present invention provides a high pressure resin transfer molding system suitable for thermosetting resin, comprising:

[0046] An injection device, a mixing device and a molding device, wherein a first pipeline connection is provided between the discharge port of the injection device and the feed port of the mixing device, and a second pipeline connection is provided between the discharge port of the mixing device and the feed port of the molding device;

[0047] The injection device delivers liquid resin and liquid curing agent to the mixing device through the first pipeline to be evenly mixed into mixed resin, and the mixing device delivers the mixed resin to the mold cavity of the molding device through the second pipeline for heating and curing.

[0048] The high-pressure resin transfer molding system suitable for thermosetting resin of the present invention utilizes an injection device to pressurize, and the liquid resin and curing agent inside are transported to a mixing device through a first pipeline in a set ratio for uniform mixing, and then the uniformly mixed mixed resin is transported to a molding device through a second pipeline for heating and curing, thereby forming a molded part after demolding.

[0049] Compared with the traditional resin transfer molding system of hot melt transfer and cooling solidification, the high-pressure resin transfer molding system of the present invention enables the molding device to have the function of heating and solidification, and the liquid resin and liquid curing agent delivered by the injection device do not need to be heated for transfer, and do not need to be heated and maintained during the transfer process, thereby reducing the heat supply of the resin, reducing the energy required for solidification, and effectively reducing the energy consumption of molding.

[0050] And because the mixed resin entering the molding device is a liquid material at room temperature, its fluidity is better than the fluidity of the heated and melted resin. Therefore, the mixed resin can be quickly and evenly filled in the molding device, and has low shrinkage and good heat resistance after thermal curing.

[0051] Among them, a cleaning device is arranged at the discharge port of the mixing device, which is connected to the first pipeline through a pipeline, and is used to inject cleaning agent into the first pipeline to flush the first pipeline, the mixing device, the second pipeline and the molding device after the mixing device stops discharging and injecting.

[0052] After completing molding, the high-pressure resin transfer molding system of this embodiment uses a cleaning device to inject a cleaning agent into the first pipeline, so that the cleaning agent can flow along the first pipeline to the mixing device, the second pipeline and the molding device in sequence, thereby cleaning the first pipeline, the mixing device, the second pipeline and the molding device, and avoiding blockage due to solidification of the mixed resin after pausing injection.

[0053] Compared with the traditional hot melt transfer and cooling solidification resin transfer molding system, which uses repeated hot melt and cleaning with detergent to clean the resin in the pipeline, it consumes more energy and leads to excessive energy consumption. However, since the high-pressure resin transfer molding system of this embodiment uses thermosetting resin, the resin is in a liquid state at room temperature during the transfer process. Therefore, when cleaning the mixed resin in the second pipeline, there is no need to repeatedly heat and melt the resin, and it can be directly cleaned with a cleaning agent, thereby effectively reducing energy consumption.

[0054] like Figure 1 As shown, the injection device comprises a first injection cylinder 1 and a second injection cylinder 2, and the first injection cylinder 1 and the second injection cylinder 2 are both provided with a plunger push rod 3, and the plunger push rod 3 can reciprocate;

[0055] A driving assembly 4 is provided at the end of the first injection cylinder 1 and the second injection cylinder 2. The output end of the driving assembly 4 is connected to the plunger push rod 3 and can drive the plunger push rod 3 to reciprocate along its axis in the first injection cylinder 1 or the second injection cylinder 2.

[0056] Specifically, when the plunger push rod 3 on the first injection cylinder 1 is working, the feed port of the first injection cylinder 1 draws liquid resin from the outside, or the discharge port thereof delivers liquid resin to the mixing device through the first pipeline;

[0057] When the second injection cylinder 2 and the plunger push rod 3 thereon are working, the feed port of the second injection cylinder 2 draws in liquid curing agent from the outside, or the discharge port thereof delivers the liquid curing agent to the mixing device through the first pipeline.

[0058] In this process, the plunger push rod 3 of the first injection cylinder 1 and the plunger push rod 3 of the second injection cylinder 2 can act independently or synchronously, specifically:

[0059] like Figure 3 , Figure 4 As shown, the driving assembly 4 includes a rotating disk 41 , an eccentric shaft 42 is arranged on the rotating disk 41 away from the center thereof, and a driving connecting rod 43 is arranged on the eccentric shaft 42 , and the other end of the driving connecting rod 43 is rotatably connected to the outer end of the plunger push rod 3 .

[0060] Based on this, when the turntable 41 is driven by the motor, the turntable 41 rotates and causes the eccentric shaft 42 to rotate eccentrically, so that the driving connecting rod 43 can reciprocate and push the plunger push rod 3 to reciprocate in the first injection cylinder 1 or the second injection cylinder 2, thereby realizing the independent suction and pumping functions of the first injection cylinder 1 and the second injection cylinder 2.

[0061] Therefore, after setting the ratio of liquid resin and liquid curing agent, the rotation speeds of the two turntables 41 can be controlled individually, so that the angular velocities of the two turntables 41 form a fixed ratio, and the angular velocities of the two turntables 41 are proportional to the ratio of liquid resin and liquid curing agent, so as to achieve the two plunger push rods 3 working independently to control the delivery ratio of liquid resin and liquid curing agent.

[0062] Furthermore, if Figure 4 As shown, a power gear 44 is disposed on the rotating shafts of the two rotating disks 41, and a transmission gear 45 is disposed between the two power gears 44;

[0063] A slide groove 411 is provided on the rotating disk 41, and a slider 412 is provided in the slide groove 411, and the eccentric shaft 42 is rotatably mounted on the slider 412;

[0064] A hydraulic push rod 46 is provided on the slider 412. The fixed end of the hydraulic push rod 46 is installed on the slider 412, and the push rod is installed on the turntable 41. The hydraulic push rod 46 can adjust the position of the slider 412 in the slide groove 411 by telescoping.

[0065] The control end of the hydraulic push rod 46 is tubular and coaxially embedded in the eccentric shaft 42, and its end is exposed outside the eccentric shaft 42, and is used to rotatably connect to the control hydraulic pipe fixed on the driving connecting rod 43, while the eccentric shaft 42 is fixedly connected to the slider 412, and the driving connecting rod 43 is rotatably connected to the eccentric shaft 42.

[0066] Specifically, one of the motors can be started independently to drive one of the turntables 41 to rotate, and the cooperation between the power gear 44 and the transmission gear 45 can make the two turntables 41 rotate synchronously, thereby realizing single-drive transportation under the same ratio of liquid resin and liquid curing agent, which is more energy-saving.

[0067] Of course, when the liquid resin and the liquid curing agent are not delivered in equal proportion, the length of the hydraulic push rod 46 can be adjusted, thereby adjusting the position of the slider 412 in the slide groove 411, that is, changing the eccentric distance of the eccentric shaft 42, so that the reciprocating distance of the plunger push rod 3 is changed, thereby achieving the adjustment of the injection amount. That is, by adjusting the length of the two hydraulic push rods 46, the injection amount of the two plunger push rods 3 in the first injection cylinder 1 and the second injection cylinder 2 can be adjusted, and the single-drive non-equal proportion delivery of the liquid resin and the liquid curing agent can be achieved.

[0068] Of course, in the process of conveying liquid resin and liquid curing agent, the single injection volume of the first injection cylinder 1 and the second injection cylinder 2 is much larger than the volume required for a single molding, thereby reducing the reciprocating frequency of the plunger push rod 3 to reduce energy consumption. Based on this, it is necessary to detect the injection volume, and therefore, the following preferred embodiments are provided.

[0069] like Figure 1 As shown, flow controllers 5 are provided at the discharge ports of the first injection cylinder 1 and the second injection cylinder 2 , filters 6 are provided at the feed ports of the first injection cylinder 1 and the second injection cylinder 2 , and the first pipeline is installed at the outlet end of the flow controller 5 .

[0070] Specifically, the filter 6 can filter the liquid resin and liquid curing agent entering the first injection cylinder 1 and the second injection cylinder 2 to avoid the formation of impurities such as agglomerates and particles that affect the uniform filling of the molding device, and the flow controller 5 can monitor the amount of liquid resin and liquid curing agent delivered by the first injection cylinder 1 and the second injection cylinder 2 to avoid over-injection or under-injection.

[0071] Based on the above embodiment, the first pipeline is used to transport the liquid resin and liquid curing agent injected by the first injection cylinder 1 and the second injection cylinder 2. To this end, a preferred embodiment of the first pipeline is provided below.

[0072] like Figure 1 As shown, the first pipeline includes a first delivery pipe 7 and a second delivery pipe 8, the first delivery pipe 7 is connected to the outlet end of the flow controller 5 on the first injection cylinder 1, and the second delivery pipe 8 is connected to the outlet end of the flow controller 5 of the second injection cylinder 2;

[0073] A valve member 9 is provided at both ends of the first conveying pipe 7 and the second conveying pipe 8 away from the flow controller 5, and the valve member 9 is connected to a mixing device to guide the liquid resin and liquid curing agent transported by the first conveying pipe 7 and the second conveying pipe 8 to converge into the mixing device for mixing.

[0074] Specifically, the first injection cylinder 1 is delivered from the first delivery pipe 7, the second injection cylinder 2 is delivered from the second delivery pipe 8, and they are combined at the valve member 9 and delivered to the mixing device for mixing. Based on this, a preferred embodiment of the mixing device is provided below.

[0075] like Figure 1 As shown, the mixing device includes a static turbulent mixer 10 , the feed end of the static turbulent mixer 10 is connected to the confluence end of the valve member 9 , and the discharge end of the static turbulent mixer 10 is connected to the second pipeline 12 .

[0076] Specifically, the static turbulent mixer 10 is a pipe with spiral blades arranged at intervals at 90 degrees. When the liquid resin and liquid curing agent in the valve member 9 flow through the static turbulent mixer 10, they are continuously cut and stretched by the spiral blades in the pipe to form a thin laminar flow, so that the liquid resin and liquid curing agent are gradually mixed and discharged.

[0077] Of course, the mixed resin after mixing is slow to solidify in a non-heated state, so it needs to be transported to the molding device as soon as possible for thermal curing to avoid solidification in the non-molding device area. Based on this, the following preferred embodiments are provided.

[0078] like Figure 1 As shown, the second pipeline includes a mixing tube 11, one end of which is connected to the discharge end of the static turbulent mixer 10, and the other end of the mixing tube 11 is provided with a check valve 12, and the discharge end of the check valve 12 is provided with a glue injection pipeline 13, and the end of the glue injection pipeline 13 away from the check valve 12 is connected to the molding device.

[0079] Specifically, the mixed resin is transported to the molding device through the second pipeline for thermal curing, and the second pipeline is composed of a mixing tube 11, a check valve 12 and a glue injection pipeline 13 connected in sequence. The mixing tube 11 is used to transport the mixed resin, and the check valve 12 prevents the pressurized mixed resin injected into the molding device from flowing back, thereby ensuring sufficient pressure. The glue injection pipeline 13 can introduce the mixed resin into the molding device for filling.

[0080] Since the high pressure resin transfer molding system of the present invention does not need to be heated, melted, or cleaned after molding, the uncured mixed resin in the pipeline can be cleaned directly with a cleaning agent, a preferred embodiment of a cleaning device is provided below.

[0081] like Figure 1 As shown, the cleaning device includes a cleaning agent tank 14, on which a high-pressure pump 15 is provided, the negative pressure end of the high-pressure pump 15 is connected to the discharge port of the cleaning agent tank 14, and the positive pressure end of the high-pressure pump 15 is provided with a cleaning pipe 16, which is connected to the valve member 9;

[0082] The valve member 9 can selectively connect the cleaning pipe 16 and the static turbulent mixer 10 , or the static turbulent mixer 10 and the first conveying pipe 7 and the second conveying pipe 8 .

[0083] Specifically, the cleaning agent tank 14 is filled with cleaning agent, and the high-pressure pump 15 can extract the cleaning agent in the cleaning agent tank 14 and deliver it to the valve member 9 at high pressure. The valve member 9 can control the conduction state between the cleaning pipe 16 and the static turbulent mixer 10. When cleaning is required, the valve member 9 is controlled to conduct the cleaning pipe 16 and the static turbulent mixer 10, and the high-pressure pump 15 can pump the cleaning agent into the static turbulent mixer 10 and deliver it to the molding device along the second pipeline, thereby realizing dead-angle cleaning of the mixed resin flow path.

[0084] As for the non-mixing area, such as the first conveying tube 7 and the second conveying tube 8, since the liquid resin and the liquid curing agent are not mixed and will not be cured, no cleaning is performed.

[0085] Specifically, Figure 1 , Figure 5 As shown, the valve member 9 includes a valve body 91, and the valve body 91 has four ports, each of which is connected to the inside of the valve body 91 through a flow channel to form a first flow channel 92, a second flow channel 93, a third flow channel 94 and a fourth flow channel 95, wherein the axes of the first flow channel 92, the second flow channel 93 and the third flow channel 94 are in the same plane, and the axes of the first flow channel 92 and the second flow channel 93, the second flow channel 93 and the third flow channel 94, and the third flow channel 94 and the first flow channel 92 are perpendicular to each other, and the axis of the fourth flow channel 95 is perpendicular to the plane formed by the axes of the first flow channel 92, the second flow channel 93 and the third flow channel 94;

[0086] A ball core 96 is disposed in the valve body 91 , and the ball core 96 is provided with a first channel 97 and a second channel 98 , wherein the first channel 97 centrally passes through the ball core 96 , and the second channel 98 is disposed perpendicular to the first channel 97 and communicates with the first channel 97 ;

[0087] The second channel 98 is always connected to the fourth flow channel 95, and the fourth flow channel 95 is connected to the feed port of the static turbulent mixer 10;

[0088] The first channel 97 is controlled by the ball core 96 rotating along the axis of the second channel 98, and can selectively connect the first flow channel 92 and the third flow channel 94, or connect the first flow channel 92 alone, and the first flow channel 92 is connected to the cleaning pipe 16, and the first flow channel 92 and the third flow channel 94 are respectively connected to the first delivery pipe 7 and the second delivery pipe 8.

[0089] When the ball core 96 rotates to switch the first flow channel 92 and the third flow channel 94, the first delivery pipe 7 and the second delivery pipe 8 are connected to the static turbulent mixer 10 through the first channel 97 and the second channel 98; and when the ball core 96 rotates to switch the first flow channel 92 alone, the cleaning pipe 16 is connected to the static turbulent mixer 10 through the first channel 97 and the second channel 98.

[0090] Furthermore, since the ball core 96 can block the first transmission pipe 7 and the second transmission pipe 8 when rotating, and after the rotation is completed, the first channel 97 is connected with the cleaning pipe 16, so that the inside of the valve body 91 can be cleaned without dead angles.

[0091] The molding device solidifies and shapes the mixed resin into a specific shape, and the mixed resin of the liquid resin and the liquid curing agent needs to be heated and solidified. Based on this, the following preferred embodiments are provided.

[0092] like Figure 1 , Figure 2 As shown, the molding device includes an upper mold assembly 19 and a lower mold assembly 20. The bottom of the upper mold assembly 19 is provided with an upper mold groove 21, and the upper surface of the lower mold assembly 20 is provided with a lower mold groove 22. After the upper mold assembly 19 and the lower mold assembly 20 are molded together, the upper mold groove 21 and the lower mold groove 22 form a mold cavity;

[0093] A plurality of injection channels 18 are provided on the upper mold assembly 19 and the lower mold assembly 20, and the glue injection pipeline 13 has a plurality of injection ports, and each injection port of the glue injection pipeline 13 is provided with a glue injection gun head 17, and each glue injection gun head 17 is detachably mounted on the upper mold assembly 19 and the lower mold assembly 20, and connected to the corresponding plurality of injection channels 18;

[0094] Wherein, heating components are also embedded inside the upper mold component 19 and the lower mold component 20.

[0095] Specifically, the mixed resin is injected into the mold cavity between the upper mold assembly 19 and the lower mold assembly 20 through the glue injection gun head 17 to wet the entire surface of the prefabricated glass fiber and the prefabricated insert. The heating assembly can be a device such as an electric heating wire or an electric heating tube that can heat the upper mold assembly 19 and the lower mold assembly 20.

[0096] Of course, the upper mold assembly 19 and the lower mold assembly 20 can be designed with core pulling structure, ejection structure, heating pipeline, resin overflow guide groove, guide column and other structures according to product needs, and the mold can be designed with resin injection port and vacuum suction port according to needs. The resin injection port and vacuum suction port can be designed in multiple locations according to the size and transition form of the product to ensure that the resin can infiltrate the entire surface of the product before curing.

[0097] Based on the above high pressure resin transfer molding system, a molding method is provided, comprising the following steps:

[0098] Step 100, placing the prefabricated insert on the skeleton of the prefabricated fiber material, and placing the prefabricated fiber material into a mold of a molding device for mold closing, so that the prefabricated insert and the prefabricated fiber material are fixed in the mold cavity;

[0099] Step 200: The injection device delivers liquid resin and liquid curing agent to the mixing device through the first pipeline. After the liquid resin and liquid curing agent are uniformly mixed in the mixing device, they are injected into the mold cavity of the mold of the molding device through the second pipeline, so that the mixed resin infiltrates the prefabricated fiber material and the prefabricated insert;

[0100] Step 300: The molding device heats the mold to rapidly solidify the mixed resin in the mold cavity, and after a set solidification time, the mold is cooled and the mold is opened for demoulding;

[0101] Step 400: After pausing molding, the cleaning device starts automatically and pumps cleaning agent into the first pipeline to clean the first pipeline, the mixing device, the second pipeline and the molding device.

[0102] Specifically, the two plunger push rods 3 work synchronously at a set speed, so that the first injection cylinder 1 and the second injection cylinder 2 deliver the liquid resin and the liquid curing agent from the first delivery pipe 8 and the second delivery pipe 9 to the valve member 9 respectively, and then after being mixed by the static turbulence mixer 10, they are injected into multiple injection gun heads 17 from the mixing pipe 11, the check valve 12, and the injection pipeline 14 in sequence, and then enter the mold cavity composed of the upper mold groove 21 and the lower mold groove 22 along the injection flow channel 18 to be heated and cured.

[0103] After molding is completed, the valve member 9 is switched so that the high-pressure pump 15 pumps the cleaning agent in the cleaning agent tank 14 into the static turbulent mixer 10 through the valve member 9, and then sequentially passes through the mixing tube 11, the check valve 12, the glue injection pipeline 14, and the glue injection gun head 17 to complete the cleaning.

[0104] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A high pressure resin transfer molding system suitable for thermosetting resins, characterized in that: It comprises an injection device, a mixing device and a molding device, wherein a first pipeline connection is provided between the discharge port of the injection device and the feed port of the mixing device, and a second pipeline connection is provided between the discharge port of the mixing device and the feed port of the molding device; The injection device delivers the liquid resin and the liquid curing agent to the mixing device through the first pipeline to be uniformly mixed into a mixed resin, and the mixing device delivers the mixed resin to the mold cavity of the molding device through the second pipeline for heating and curing; Wherein, a cleaning device is provided at the discharge port of the mixing device, and the cleaning device is connected to the first pipeline through a pipeline, and is used for injecting a cleaning agent into the first pipeline to flush the first pipeline, the mixing device, the second pipeline and the molding device after the mixing device stops discharging and injecting.

2. A high pressure resin transfer molding system suitable for thermosetting resin according to claim 1, characterized in that: The injection device comprises a first injection cylinder (1) and a second injection cylinder (2), wherein the first injection cylinder (1) and the second injection cylinder (2) are both provided with a plunger push rod (3), and the plunger push rod (3) is capable of reciprocating motion; Wherein, when the plunger push rod (3) on the first injection cylinder (1) is working, the feed port of the first injection cylinder (1) draws liquid resin from the outside, or the discharge port thereof delivers liquid resin to the mixing device through the first pipeline; When the plunger push rod (3) on the second injection cylinder (2) is working, the feed port of the second injection cylinder (2) draws in liquid curing agent from the outside, or its discharge port delivers liquid curing agent to the mixing device through the first pipeline.

3. A high pressure resin transfer molding system suitable for thermosetting resin according to claim 2, characterized in that: A driving assembly (4) is provided at the end of each of the first injection cylinder (1) and the second injection cylinder (2); the output end of the driving assembly (4) is connected to the plunger push rod (3) and is capable of driving the plunger push rod (3) to reciprocate along its axis in the first injection cylinder (1) or the second injection cylinder (2).

4. A high pressure resin transfer molding system suitable for thermosetting resin according to claim 2, characterized in that: A flow controller (5) is provided at the discharge port of the first injection cylinder (1) and the second injection cylinder (2), a filter (6) is provided at the feed port of the first injection cylinder (1) and the second injection cylinder (2), and the first pipeline is installed at the outlet end of the flow controller (5).

5. A high pressure resin transfer molding system suitable for thermosetting resin according to claim 4, characterized in that: The first pipeline comprises a first delivery pipe (7) and a second delivery pipe (8), the first delivery pipe (7) being connected to the outlet end of the flow controller (5) on the first injection cylinder (1), and the second delivery pipe (8) being connected to the outlet end of the flow controller (5) on the second injection cylinder (2); A valve member (9) is provided at the ends of the first conveying pipe (7) and the second conveying pipe (8) away from the flow controller (5), and the valve member (9) is connected to the mixing device to guide the liquid resin and liquid curing agent transported by the first conveying pipe (7) and the second conveying pipe (8) to converge into the mixing device for mixing.

6. A high pressure resin transfer molding system suitable for thermosetting resin according to claim 5, characterized in that: The mixing device comprises a static turbulent mixer (10), the feed end of the static turbulent mixer (10) is connected to the converging end of the valve member (9), and the discharge end of the static turbulent mixer (10) is connected to the second pipeline (12).

7. A high pressure resin transfer molding system suitable for thermosetting resin according to claim 6, characterized in that: The second pipeline comprises a mixing tube (11), one end of the mixing tube (11) is connected to the discharge end of the static turbulent mixer (10), the other end of the mixing tube (11) is provided with a check valve (12), the discharge end of the check valve (12) is provided with a glue injection pipeline (13), and the end of the glue injection pipeline (13) away from the check valve (12) is connected to the molding device.

8. A high pressure resin transfer molding system suitable for thermosetting resin according to claim 6, characterized in that: The cleaning device comprises a cleaning agent tank (14), a high-pressure pump (15) is arranged on the cleaning agent tank (14), a negative pressure end of the high-pressure pump (15) is connected to a discharge port of the cleaning agent tank (14), and a cleaning pipe (16) is arranged at a positive pressure end of the high-pressure pump (15), and the cleaning pipe (16) is connected to the valve member (9); Wherein, the valve member (9) can selectively connect the cleaning pipe (16) and the static turbulent mixer (10), or the static turbulent mixer (10) and the first conveying pipe (7) and the second conveying pipe (8).

9. A high pressure resin transfer molding system suitable for thermosetting resin according to claim 7, characterized in that: The molding device comprises an upper mold assembly (19) and a lower mold assembly (20), wherein the bottom of the upper mold assembly (19) is provided with an upper mold groove (21), and the upper surface of the lower mold assembly (20) is provided with a lower mold groove (22), and after the upper mold assembly (19) and the lower mold assembly (20) are molded together, the upper mold groove (21) and the lower mold groove (22) form a mold cavity; A plurality of injection channels (18) are arranged on the upper mold assembly (19) and the lower mold assembly (20), the glue injection pipeline (13) has a plurality of injection ports, and each of the injection ports of the glue injection pipeline (13) is provided with a glue injection gun head (17), and each of the glue injection gun heads (17) is detachably mounted on the upper mold assembly (19) and the lower mold assembly (20), and is connected to the corresponding plurality of injection channels (18); Wherein, heating components are also embedded inside the upper mold component (19) and the lower mold component (20).

10. A molding method using the high pressure resin transfer molding system suitable for thermosetting resin according to any one of claims 1 to 9, characterized in that: The steps include: Step 100, placing the prefabricated insert on the skeleton of the prefabricated fiber material, and placing the prefabricated fiber material into a mold of a molding device for mold closing, so that the prefabricated insert and the prefabricated fiber material are fixed in the mold cavity; Step 200: The injection device delivers liquid resin and liquid curing agent to the mixing device through the first pipeline. After the liquid resin and liquid curing agent are uniformly mixed in the mixing device, they are injected into the mold cavity of the mold of the molding device through the second pipeline, so that the mixed resin infiltrates the prefabricated fiber material and the prefabricated insert; Step 300: The molding device heats the mold to rapidly solidify the mixed resin in the mold cavity, and after a set solidification time, the mold is cooled and the mold is opened for demoulding; Step 400: After pausing molding, the cleaning device starts automatically and pumps cleaning agent into the first pipeline to clean the first pipeline, the mixing device, the second pipeline and the molding device.

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