Three-component resin mixing nozzle, injection device, and composite material forming method

Abstract

A three-component resin mixing nozzle, an injection device, and a composite material forming method. The mixing nozzle (600) comprises a movable push rod (602) and a first mixing cavity (606); the movable push rod (602) can freely slide in the first mixing cavity (606); a first groove (605a) and a second groove (605b) which are not communicated with each other extend in the sliding direction of the movable push rod (602); a resin feeding pipeline (02a) is communicated with a release agent feeding pipeline (03); and when the movable push rod (602) slides, a curing agent feeding pipeline (01a) and a curing agent return pipeline (01b) are communicated by means of the first groove (605a), the resin feeding pipeline (02a) and a resin return pipeline (02b) are communicated by means of the second groove (605b), or the curing agent feeding pipeline (01a) and the resin feeding pipeline (02a) are communicated with the first mixing cavity (606).

Description

Three-component resin mixing nozzle, glue injection device, and composite material molding method Technical Field

[0001] The present application relates to the technical field of advanced composite material molding equipment, and in particular to a three-component resin mixing nozzle, a glue injection device, and a composite material molding method. Background Art

[0002] Carbon fiber reinforced high-performance composite materials have excellent specific strength, specific modulus, corrosion resistance, energy absorption and other characteristics, and play an important supporting role in the national economic pillar industries such as intelligent connected vehicles, aerospace, rail transit, and marine engineering equipment.

[0003] At present, the main processes for forming carbon fiber composite materials are autoclaves, prepreg molding, medium and low pressure resin transfer molding, etc., which have problems such as high application cost, low forming efficiency, long manufacturing process, and many manual steps, which limit its large-scale application. The high-pressure injection molding method can be used to prepare carbon fiber raw materials into complex structural components in a set of equipment. It has high forming efficiency, high degree of automation, and low cost. It is a short-process forming and manufacturing technology. For example, HP-RTM (High Pressure Resin Transfer Molding) is high-pressure resin transfer molding. Among them, multi-component liquid resin realizes the compounding of multifunctional components. The injection and infiltration process of carbon fiber and multi-component liquid resin determines the manufacturing speed and product quality, and is a key link in the composite material forming process.

[0004] In addition, finished composite materials often require a composite protective layer. The composite protective layer of current market products is mainly achieved by spraying. The resin is sprayed as evenly as possible on the product surface through the atomization function of the nozzle using a pressurized method. On the one hand, in order to ensure a good atomization spraying effect, the resin contains a diluent, and after spraying, it is left to evaporate, which will have irreversible effects on the human body and the environment. On the other hand, atomization / spraying has high requirements for surface flatness (especially concave structures), and flattening is required to obtain a bright appearance. In addition, the introduction of the diluent requires volatilization time, and artificially accelerating the volatilization speed will reduce the quality of the protective layer, which prolongs the process time and is difficult to adapt to continuous production.

[0005] In addition, the traditional preparation process of composite material finished products uses injection molding or other processes to first form the plate body and then replace the mold to spray resin. This not only increases production time and processing costs, but the secondary spraying process will also reduce the roughness of the cover surface and affect product quality.

[0006] In addition, existing glue injection equipment on the market also commonly suffers from issues such as easy clogging of the injection pipes and mixing nozzles by cured resin, difficulty in cleaning, and a short service life. There is an urgent need for an environmentally friendly, convenient, and continuous production resin mixing system and composite material molding method.

[0007] Summary of the Invention

[0008] In view of the above analysis and in response to the shortcomings in the existing technology, this application aims to provide a three-component resin mixing nozzle, a glue injection device, and a composite material molding method to solve at least one of the problems in the existing glue mixing method, such as the mixing pipeline and the mixing nozzle are easily clogged by the solidified material, difficult to clean, short service life, large environmental pollution and difficulty in in-mold molding.

[0009] The purpose of this application is mainly achieved through the following technical solutions:

[0010] A three-component resin mixing nozzle, comprising: a movable push rod, a first mixing chamber;

[0011] The movable push rod can slide freely along the inner wall of the first glue mixing chamber in the first glue mixing chamber;

[0012] The movable push rod is provided with a first groove and a second groove which are not connected to each other and extend along the sliding direction thereof;

[0013] The three-component resin mixing nozzle also includes: a curing agent feed pipeline, a curing agent return pipeline, a resin feed pipeline, a resin return pipeline and a release agent feed pipeline;

[0014] The curing agent feed pipeline and the curing agent return pipeline are located on the same side of the first adhesive mixing chamber, the resin feed pipeline and the resin return pipeline are located on the same side of the first adhesive mixing chamber, and a through hole is opened in the radial direction on the wall of the first adhesive mixing chamber, which is connected to the curing agent feed pipeline, the curing agent return pipeline, the resin feed pipeline, and the resin return pipeline respectively;

[0015] The resin feed pipeline is connected to the release agent feed pipeline;

[0016] When the movable push rod slides along the inner wall of the first glue mixing chamber, the curing agent feed pipeline and the curing agent return pipeline can be connected through the first groove, the resin feed pipeline and the resin return pipeline can be connected through the second groove, and the curing agent feed pipeline and the resin feed pipeline can be connected to the first glue mixing chamber.

[0017] Preferably, the three-component resin mixing nozzle further comprises: a static mixer, and the release agent feed pipeline is connected to the resin feed pipeline through the static mixer.

[0018] Preferably, the three-component resin mixing nozzle is provided with a stepless pressure regulating nozzle, and the curing agent feed pipeline and the resin feed pipeline are connected to the first glue mixing chamber through the stepless pressure regulating nozzle.

[0019] Preferably, the discharge port of the static mixer is communicated with the feed port of the second stepless pressure regulating device.

[0020] Preferably, the stepless pressure regulating nozzle includes a nozzle, a needle valve body and a pressure setting device connected in sequence from bottom to top, the nozzle is provided with a nozzle, the needle valve body is provided with a needle that can move up and down, the upper end of the needle is connected to the pressure setting device, and the needle is adjusted to move up and down by the pressure setting device to move away from or block the nozzle.

[0021] A three-component resin injection device comprises: a storage device, a feeding device and the above-mentioned three-component resin mixing nozzle. The feeding device injects three components of the three-component resin in the storage device into the mixing nozzle to obtain the three-component resin after mixing.

[0022] Preferably, the glue injection device further comprises: a first material storage tank, a second material storage tank, a third material storage tank, a first high-pressure metering pump, a second high-pressure metering pump, and a third high-pressure metering pump;

[0023] The first storage tank is used to store the curing agent component, and is connected to the mixing nozzle through the first high-pressure metering pump to realize the feeding of the curing agent component; the second storage tank is used to store the resin component, and is connected to the mixing nozzle through the second high-pressure metering pump to realize the feeding of the resin component; the third storage tank is used to store the release agent component, and is connected to the mixing nozzle through the third high-pressure metering pump to realize the feeding of the release agent component.

[0024] A composite material forming system comprises the above-mentioned glue injection device and an in-mold forming mold which uses the glue injection device to match the glue injection.

[0025] Preferably, the in-mold forming mold includes: a punch and a die that cooperate with each other, a sealing plate located between the punch and the die, and a sealing plate pushing device; the punch and the die can move away from or closer to each other, and when the punch and the die are slightly opened, the sealing plate pushing device seals and fixes the sealing structure to the punch.

[0026] A composite material molding method uses the composite material molding system.

[0027] Compared with the existing technology, this application can achieve at least one of the following beneficial effects:

[0028] (1) The present application realizes efficient mixing of three-component resins in the injection state, realizes reflux of two components of the three-component resins in the intermittent state, realizes stable switching between the intermittent and injection states, ensures stable pressure during the injection stage, and utilizes the movable push rod of the nozzle and the first mixing chamber design to remove residual mixed glue in the injection state, thereby avoiding clogging of the mixing nozzle by the solidified resin.

[0029] (2) In the present application, the three-component resins are mixed and used immediately in the mixing nozzle, and no storage space for the mixed resin is provided; the two-component resin mixing area is provided at the injection outlet, thereby reducing the length of the flow pipeline of the mixed resin, thereby improving the problem in the existing molding method that the injection pipeline and the mixing nozzle are easily clogged by the solidified resin.

[0030] (3) The present application selects solvent-free three-component resin and high-efficiency mixing equipment, sprays in the mold for one-time molding, integrates spraying into the molding method of injection molding or other in-mold processes, realizes direct surface composite molding, and forms high-gloss products, which can greatly improve work efficiency and yield rate, improve product performance, save energy, reduce environmental pollution, avoid material waste, reduce investment costs, etc. The obtained product has the advantages of high stiffness, rigidity, high fatigue life, etc., and is suitable for direct application in automotive structural parts, safety parts, decorative parts and outer covering parts.

[0031] (5) The present application sets mutually cooperating punches and die and a sealing plate and a sealing plate pushing device between the punches and die in the forming mold. In addition to performing molding operations such as product injection molding and molding, the present application can also use the sealing plate pushing device to seal and fix the sealing structure to the punch when the punch and die are slightly opened, and perform a composite protective layer operation on one side of the product, thereby realizing solidification and molding in the mold, greatly improving work efficiency, and facilitating continuous production.

[0032] (6) The composite material molding operation of the present application integrates the composite protective layer into the injection molding, compression molding or other in-mold molding mold. After the product is molded in the mold, the resin is injected into the slightly opened mold by slightly opening the mold, and the composite protective layer of the parts is directly applied in the mold. This makes it unnecessary for the molding process to be carried out in a traditional spray room or device, significantly improving the processing efficiency of the product and having the huge advantages of being environmentally friendly and clean.

[0033] (7) The in-mold molding mold of the present application can form a closed molding cavity inside, which is convenient for the injection molding of the composite product, eliminating the traditional complex process of first molding and second molding. At the same time, the closed cavity is vacuumed to reduce the roughness of the product, improve the appearance quality of the product, and form a high-gloss product, which can greatly improve work efficiency and yield rate, improve product performance, save energy, reduce environmental pollution, avoid material waste, and reduce investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered as limiting the present application. Like reference symbols denote like components throughout the drawings.

[0035] FIG1a is a schematic diagram of a three-component resin mixing nozzle in a mixing and injection state in one embodiment of the present application;

[0036] FIG1 b is a schematic diagram of a three-component resin mixing nozzle in the injection gap state in one embodiment of the present application;

[0037] FIG2 is a schematic diagram of a three-component glue injection device in one embodiment of the present application;

[0038] FIG3 is a cross-sectional view of a stepless pressure regulating nozzle in one embodiment of the present application;

[0039] FIG4 a is a schematic diagram of the three-dimensional structure of a stepless pressure regulating nozzle in one embodiment of the present application;

[0040] FIG4 b is a cross-sectional view of a stepless pressure regulating nozzle in one embodiment of the present application;

[0041] FIG5 is a schematic structural diagram of an in-mold forming mold provided by the present application;

[0042] FIG6 is a cross-sectional view taken along line AA' of FIG5;

[0043] FIG7 is a cross-sectional view taken along line BB' of FIG5;

[0044] FIG8 is a schematic structural diagram of a male mold of an in-mold forming mold provided by the present application;

[0045] FIG9 is a schematic structural diagram of a female mold of an in-mold forming mold provided by the present application;

[0046] FIG10 is a schematic structural diagram of the annular sealing plate of the in-mold forming mold provided in this application.

[0047] Reference numerals

[0048] Curing agent feed pipeline 01a, curing agent return pipeline 01b, resin feed pipeline 02a, resin return pipeline 02b, release agent feed pipeline 03;

[0049] Hydraulic pump station 100, first high-pressure metering pump 200a, second high-pressure metering pump 200b, third high-pressure metering pump 200c, first storage tank 300a, second storage tank 300b, third storage tank 300c, vacuum pump 400, feeding pump 500;

[0050] Mixing nozzle 600, first stepless pressure regulating device 601a, second stepless pressure regulating device 601b, movable push rod 602, first hydraulic chamber 603a, second hydraulic chamber 603b, piston head 604, first groove 605a, second groove 605b, first rubber mixing chamber 606;

[0051] First low-pressure filter 701a, second low-pressure filter 701b, first high-pressure filter 702a, second high-pressure filter 702b, first water temperature controller 703a, second water temperature controller 703b, first flow meter 800a, second flow meter 800b, third flow meter 800c;

[0052] Static mixer 900, second rubber mixing chamber 901, one-way valve 902, second hydraulic device 903, spiral baffle 904;

[0053] Nozzle 6001, nozzle 6011, needle valve body 6002, needle 6003, knob screw 6041, lock nut 6042, end cap 6043, first spring push rod 6044, second spring push rod 6045, third spring push rod 6046, butterfly spring 6047, first guide sleeve 6048, second guide sleeve 6049, third guide sleeve 6050, manual housing 6051, stepper motor 6061, electric housing 6062, directional screw 6063, guide hole 6064, coupling 6065, lead screw 6066, slider 6067, flow hole 6007, spring retaining ring 6008;

[0054] Punch 0100; core 0110; injection hole 0111; punch fixing plate 0120; punch pad 0130; punch base 0140; second injection channel 0150; die 0200; cavity 0210; die pad 0220; die base 0230; annular sealing plate 0300; ring 0310; extension 0320; first injection channel 0321; sealing ring 0330; vacuum channel 0400; transverse channel 04 10; vertical channel 0420; vacuum channel opening and closing device 0500; vacuum valve push rod 0510; vacuum valve cylinder 0520; vacuum valve piston 0521; sealing plate push rod 0610; sealing plate push rod fixing plate 0620; sealing plate push rod push plate 0630; sealing plate cylinder 0640; piston 0641; ejector push rod 0710; ejector push rod fixing plate 0720; ejector push plate 0730; ejector cylinder 0740; product 0800. DETAILED DESCRIPTION

[0055] In order to make the technical problems, technical solutions and beneficial effects solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0056] On the one hand, the present application discloses a three-component resin mixing nozzle, as shown in Figures 1a-1b, the mixing nozzle 600 includes: a movable push rod 602 and a first mixing chamber 606; the movable push rod 602 can slide freely along the inner wall of the first mixing chamber 606;

[0057] The movable push rod 602 is provided with a first groove 605a and a second groove 605b extending along the sliding direction and not connected to each other;

[0058] The three-component resin mixing nozzle is also equipped with: a curing agent feed pipeline 01a, a curing agent return pipeline 01b, a resin feed pipeline 02a, a resin return pipeline 02b and a release agent feed pipeline 03;

[0059] The curing agent feed line 01a and the curing agent return line 01b are located on the same side of the first adhesive mixing chamber 606, and the resin feed line 02a and the resin return line 02b are located on the same side of the first adhesive mixing chamber 606. Through holes are radially opened on the wall of the first adhesive mixing chamber 606, respectively communicating with the curing agent feed line 01a, the curing agent return line 01b, the resin feed line 02a, and the resin return line 02b.

[0060] The resin feed line 02a is connected to the release agent feed line 03;

[0061] When the movable push rod 602 slides along the inner wall of the first glue mixing chamber 606, the curing agent feed pipeline 01a and the curing agent return pipeline 01b can be connected through the first groove 605a, and the resin feed pipeline 02a and the resin return pipeline 02b can be connected through the second groove 605b, and the curing agent feed pipeline 01a and the resin feed pipeline 02a can be connected to the first glue mixing chamber 606.

[0062] It can be understood that when the movable push rod 602 slides along the inner wall of the first glue mixing chamber 606, the first groove 605a and the second groove 605b slide accordingly, and their positions change along the first glue mixing chamber 606. When the first groove 605a is connected to the curing agent feed pipeline 01a and the curing agent return pipeline 01b at the same time, the first groove 605a and the wall surface of the first glue mixing chamber 606 form a connecting channel for the curing agent feed pipeline 01a and the curing agent return pipeline 01b, and the connecting channel can be used as a channel for recovering the curing agent from the curing agent feed pipeline 01a to the curing agent return pipeline 01b; similarly, the second groove 605b and the wall surface of the first glue mixing chamber 606 form a connecting channel for the resin feed pipeline 02a and the resin return pipeline 02b, and the connecting channel can be used as a channel for recovering the resin from the resin feed pipeline 02a to the resin return pipeline 02b.

[0063] During implementation, the end position of the movable push rod 602 is adjusted to be located above the through hole connected to the curing agent feeding pipeline 01a and the through hole connected to the resin feeding pipeline 02a, so that the curing agent feeding pipeline 01a and the resin feeding pipeline 02a are connected to the first mixing chamber 606. At the same time, the resin feeding pipeline 02a is connected to the release agent feeding pipeline 03, so that the release agent and the resin component are mixed with the resin in the first mixing chamber 606 to prepare a three-component resin, and under the action of the push rod, the resin enters the molding mold through the outlet at the lower end of the first mixing chamber 606 to realize the molding operation; when it is necessary to return the material, the movable push rod 602 is adjusted along the first mixing chamber 606 to prevent the mold from being molded. The inner wall of the glue mixing chamber 606 slides, so that the first groove 605a is connected to the curing agent feed pipeline 01a and the curing agent return pipeline 01b at the same time. After the curing agent feed enters the first groove 605a, it is returned through the curing agent return pipeline 01b connected to the first groove 605a. At the same time, the second groove 605b is connected to the resin feed pipeline 02a and the resin return pipeline 02b at the same time. After the resin enters the second groove 605b, it is returned through the resin return pipeline 02b connected to the second groove 605b.

[0064] Compared with the prior art, the present application realizes that the resin can be prepared and used immediately without storage by setting a movable push rod and a first groove and a second groove on the movable push rod corresponding to the curing agent feed pipeline, the curing agent return pipeline, the resin feed pipeline, and the resin return pipeline. At the same time, it realizes that the glue can be mixed and discharged quickly under stable pressure and flow conditions without shutting off the glue raw material feed, which helps to improve the molding stability and quality of the protective layer; the present application does not need to shut down the feeding device when switching between glue injection and glue injection intermittent standby state, which helps to achieve continuous production.

[0065] At the same time, after the movable push rod 602 completes the mixing and stops feeding the material through the feeding pipeline, it slides toward the glue outlet and can simultaneously complete the cleaning of the residual glue in the first glue mixing chamber 606.

[0066] Compared with the prior art, the present invention can easily remove residual mixed glue and avoid clogging of the mixing nozzle by the solidified resin.

[0067] The present application designs a glue injection nozzle that can flexibly control the mixed injection / reflux of each component without shutting down the feeding power. It helps to ensure the stability of the injection volume and mixing uniformity in intermittent single glue injection with a short time. It can adapt to the intermittent glue injection and curing rules in the mold, and improves the defects of intermittent glue injection causing easy clogging of the mixing nozzle and difficulty in controlling the injection volume during short-time glue injection.

[0068] In order to improve the problem in existing glue mixing and molding methods that the glue injection pipeline and mixing nozzle are easily clogged by the solidified resin, the present application optimizes the structural design of the mixing nozzle: on the one hand, the two-component resins are mixed and used immediately in the mixing nozzle, and no storage space for the mixed resin is set; on the other hand, the two-component resin mixing area is set at the glue injection outlet to reduce the length of the mixed resin flow pipeline.

[0069] In order to reduce the pressure and flow changes caused by the start and stop of the resin mixing switch, ensure the stability of the resin ratio, obtain continuous and stable protective layer quality, and adapt to continuous production, this application designs a reflux structure in the mixing nozzle to allow the two components that are not involved in the mixing to reflux separately.

[0070] Preferably, in order to achieve better mixing of the release agent and the resin component, the mixing nozzle 600 is provided with a static mixer 900, the release agent feed pipeline 03 is connected to the resin feed pipeline 02a through the static mixer 900, and the discharge port of the static mixer 900 is connected to the feed port of the second stepless pressure regulating device 601b.

[0071] Specifically, as shown in FIG1a-FIG1b, the static mixer 900 is provided with a second mixing chamber 901, a second hydraulic device 903, and a spiral baffle 904;

[0072] The release agent feed line 03 is connected to the second glue mixing chamber 901 through the second hydraulic device 903, and the resin feed line 02a is connected to the second glue mixing chamber 901;

[0073] The spiral baffle 904 is disposed in the second mixing chamber 901 and forms a static mixing area with the second mixing chamber 901 for mixing the resin components and the release agent.

[0074] Preferably, a one-way valve 902 is provided on one side of the second hydraulic device 903 communicating with the second rubber mixing chamber 901 , and the two are connected via the one-way valve 902 to prevent backflow.

[0075] Specifically, the movable push rod 602 is relatively deep in the first mixing chamber 606 and is connected to one side thereof with a piston head 604; the three-component resin mixing nozzle is provided with a hydraulic chamber that provides power for the movable push rod 602; the piston head 604 penetrates into the hydraulic chamber to divide the hydraulic chamber into a first hydraulic chamber 603a and a second hydraulic chamber 603b that are not connected to each other.

[0076] During implementation, the piston head 604 and the movable push rod 602 slide by adjusting the pressure difference between the first hydraulic chamber 603a and the second hydraulic chamber 603b.

[0077] Preferably, in order to achieve stable feeding of curing agent and resin, the three-component resin mixing nozzle is provided with a stepless pressure regulating nozzle, and the curing agent feeding pipeline 01a and the resin feeding pipeline 02a are connected to the first glue mixing chamber 606 through the stepless pressure regulating nozzle.

[0078] 1a and 1b , the curing agent feed line 01a is connected to the first glue mixing chamber 606 via a first stepless pressure regulating device 601a , and the resin feed line 02a is connected to the first glue mixing chamber 606 via a second stepless pressure regulating device 601b .

[0079] Specifically, as shown in Figures 3 to 4b, the stepless pressure regulating nozzle includes, from bottom to top, a nozzle 6001, a needle valve body 6002 and a pressure setting device connected in sequence. The nozzle 6001 is provided with a nozzle port 6011, and the needle valve body 6002 is provided with a needle 6003 that can move up and down. The upper end of the needle 6003 is connected to the pressure setting device. The needle 6003 is adjusted to move up and down by the pressure setting device to move away from or block the nozzle port 6011.

[0080] During operation, the stepless pressure-regulating nozzle is fixed to the mixing tank via screws. The flow hole 6007 on the needle valve body 6002 is positioned to align with the resin or curing agent flow path, ensuring that the resin or curing agent can flow through the flow hole 6007 and enter the interior of the needle valve body 6002. When the resin or curing agent pressure falls below the set pressure, the tip of the needle 6003, acting under the action of the pressure setting device, blocks the nozzle opening 6011 on the nozzle 6001, preventing the resin or curing agent from being sprayed. When the resin or curing agent pressure exceeds the set pressure, the needle 6003 moves upward, contacting the nozzle opening 6011 on the nozzle 6001, and the resin or curing agent is sprayed out of the nozzle opening 6011 at a stable pressure. During use, the pressure setting device allows for rapid adjustment of the nozzle's discharge pressure, ensuring precise dispensing of the resin or curing agent.

[0081] In a specific embodiment, the pressure setting device includes a manual pressure setting device or an electric pressure setting device.

[0082] In a specific embodiment, the manual pressure setting device includes a knob screw 6041, a locking nut 6042 and a manual housing 6051 connected in sequence from top to bottom. The knob screw 6041 and the locking nut 6042 are arranged opposite to each other, and the knob screw 6041 is movably connected to the manual housing 6051 through an end cover 6043.

[0083] In a specific embodiment, a spring push rod is provided in the manual housing 6051, the upper end of the spring push rod is connected to the lower end of the knob screw 6041, the lower end of the spring push rod is connected to a guide sleeve, and the guide sleeve is connected to the spray needle 6003.

[0084] In a specific embodiment, the spring push rod includes, from top to bottom, a first spring push rod 6044, a second spring push rod 6045 and a third spring push rod 6046, which are connected in sequence and have decreasing diameters. The guide sleeve includes, from top to bottom, a first guide sleeve 6048, a second guide sleeve 6049 and a third guide sleeve 6050, which are connected in sequence. The first guide sleeve 6048 and the third guide sleeve 6049 have the same diameter and are smaller than the diameter of the second guide sleeve 6047. The first guide sleeve 6048 and the third guide sleeve 6050 have the same diameter. The third spring push rod 6046 is slidingly connected to the first guide sleeve 6048. A butterfly spring 6047 is arranged between the first spring push rod 6044 and the second guide sleeve 6049.

[0085] It should be noted that the principle of adjusting the pressure using a manual pressure setting device is as follows:

[0086] According to the rotation angle of the knob screw 6041 and the downward distance thereof and the spring coefficient of the butterfly spring 6047, the relationship between the rotation angle of the knob screw 6041 and the pressure is calculated, and the pressure value scale is marked on the knob screw 6041 to facilitate quick pressure setting.

[0087] To increase the nozzle's discharge pressure: first, rotate the lock nut 6042 counterclockwise to loosen the knob screw 6041. Then, rotate the knob screw 6041 clockwise to a certain pressure. The knob screw 6041 rotates downward, pushing the spring push rod downward by the same distance. The spring push rod and the guide sleeve squeeze the butterfly spring 6047 in the middle, causing the butterfly spring 6047 to produce greater elastic deformation. Due to the characteristics of elastic deformation, the guide sleeve increases the force on the spray needle 6003, thereby increasing the pressure required for the resin or curing agent to move the spray needle 6003 upward to the set pressure. Then, rotate the lock nut 6042 clockwise to lock the knob screw 6041.

[0088] To lower the nozzle's spray pressure: First, turn the lock nut 6042 counterclockwise to loosen the knob screw 6041. Then, turn the knob screw 6041 counterclockwise to a desired pressure. As the knob screw 6041 rotates upward, the spring push rod moves the same distance under the action of the butterfly spring 6047. The spring push rod and the guide sleeve reduce the pressure on the butterfly spring 6047, reducing the elastic deformation of the butterfly spring 6047. Due to the characteristics of elastic deformation, the force exerted by the guide sleeve on the spray needle 6003 decreases, reducing the pressure required for the resin or curing agent to move the spray needle 6003 upward to the set pressure. Then, turn the lock nut 6042 clockwise to tighten the knob screw 6041, completing the pressure setting.

[0089] In a specific embodiment, the electric pressure setting device includes a stepper motor 6061 and an electric housing 6062. The lower end of the stepper motor 6061 is connected to the upper end of the electric housing 6062. The stepper motor 6061 is also electrically connected to a controller. The interior of the electric housing 6062 includes a coupling 6065, a screw 6066 and a guide sleeve connected in sequence from top to bottom. The coupling 6065 is fixedly connected to the stepper motor 6061. A slider 6067 is slidably connected to the electric housing 6062, and a plurality of directional screws 6063 are fixedly connected to the slider 6067.

[0090] Specifically, the upper end of the lead screw 6066 is fixedly connected to the coupling 6065, the lower end of the lead screw 6066 is slidingly connected to the guide sleeve, the coupling 6065 is fixedly mounted on the stepper motor 6061, the stepper motor 6061 is fixedly connected to the electric housing 6062 by screws, and the stepper motor 6061 is connected to the controller through a signal line.

[0091] In a specific embodiment, a plurality of guide holes 6064 are provided on the electric housing 6062 corresponding to the directional screw 6063 , and the end of the directional screw 6063 away from the slider 6067 is located in the guide hole 6064 , and the directional screw 6063 slides up and down in the guide hole 6064 through the slider 6067 .

[0092] In a preferred embodiment, the nut on the directional screw 6063 is located in the guide hole 6064. The function of the directional screw 6063 is to prevent the slider 6067 from rotating as the lead screw 6066 rotates. The nut on the directional screw 6063 is located in the guide hole 6064 so that when the lead screw 6066 rotates, the slider 6067 can only slide up and down. The slider 6067 and the lead screw 6066 are connected by threads.

[0093] In a specific embodiment, a butterfly spring 6047 is provided between the upper end of the guide sleeve and the slider 6067 , and the lower end of the guide sleeve is connected to the spray needle 6003 .

[0094] Specifically, the slider 6067 is slidably connected to the electric housing 6062, the guide sleeve is slidably connected to the electric housing 6062, the lower end of the guide sleeve is in contact with the spray needle 6003, and when the guide sleeve moves downward, the guide sleeve is in contact with the upper end of the spray needle 6003, causing the spray needle 6003 to move downward.

[0095] In a specific embodiment, the lower end of the lead screw 6066 is slidably connected to the guide sleeve.

[0096] In a specific embodiment, the nozzle 6001 is positioned with the needle valve body 6002 via a spring retaining ring 6008 .

[0097] It should be noted that the principle of adjusting the pressure using an electric pressure setting device is as follows:

[0098] When stepper motor 6061 rotates a certain angle, lead screw 6066 also rotates a certain angle, causing slider 6067 to move up and down under the action of lead screw 6066. The relationship between the rotation angle of stepper motor 6061 and pressure can be calculated based on the travel distance and the spring constant of butterfly spring 6047. After programming the corresponding calculation program on the controller, simply inputting the pressure value will automatically set the corresponding pressure.

[0099] When the nozzle discharge pressure is increased: the controller controls the stepper motor 6061 to rotate clockwise by a certain angle. Under the action of the lead screw 6066, the slider 6067 moves downward. The slider 6067 and the guide sleeve squeeze the butterfly spring 6047 in the middle. The butterfly spring 6047 produces greater elastic deformation. Due to the characteristics of elastic deformation, the force of the guide sleeve on the spray needle 6003 increases, and the pressure required for the resin or curing agent to move the spray needle 6003 upward is increased to the set pressure.

[0100] When the nozzle discharge pressure is reduced: the controller controls the stepper motor 6061 to rotate counterclockwise by a certain angle. Under the action of the lead screw 6066, the slider 6067 moves upward. The slider 6067 and the guide sleeve reduce the squeeze on the butterfly spring 6047. According to the characteristics of elastic deformation, the force of the guide sleeve on the spray needle 6003 is reduced. As a result, the pressure required for the resin or curing agent to move the spray needle 6003 upward is reduced to the set pressure, thereby completing the pressure setting.

[0101] It should be noted that the nozzle 6001, the needle valve body 6002 and the needle 6003 described in this application are all provided with sealing rings to play a sealing role, and the guide sleeve is a hollow structure inside.

[0102] On the other hand, the present application discloses a three-component resin injection device, as shown in FIG2 , comprising the above-mentioned mixing nozzle 600 and a material storage device and a material feeding device;

[0103] The glue injection device includes a mixing nozzle, and the feeding device injects the components of the three-component resin in the storage device into the mixing nozzle to mix and obtain the three-component resin;

[0104] The glue injection device mixes the three components of the three-component resin to obtain the three-component resin, and injects the three-component resin into the in-mold molding mold to form the protective layer of the workpiece in the mold.

[0105] Specifically, the glue injection device further includes: a first material storage tank 300a, a second material storage tank 300b, a third material storage tank 300c, a first high-pressure metering pump 200a, a second high-pressure metering pump 200b, and a third high-pressure metering pump 200c;

[0106] The first storage tank 300a is used to store the curing agent component, and is connected to the mixing nozzle 600 through the first high-pressure metering pump 200a to realize the feeding of the curing agent component; the second storage tank 300b is used to store the resin component, and is connected to the mixing nozzle 600 through the second high-pressure metering pump 200b to realize the feeding of the resin component; the third storage tank 300c is used to store the release agent component, and is connected to the mixing nozzle 600 through the third high-pressure metering pump 200c to realize the feeding of the release agent component.

[0107] Preferably, a feeding pump 500 is connected between the first storage tank 300a and the first high-pressure metering pump 200a, and the feeding pump 500 feeds material to the first high-pressure metering pump 200a.

[0108] Preferably, the first high-pressure metering pump 200a is further provided with a first low-pressure filter 701a at the feed end and a first high-pressure filter 702a at the discharge end, for filtering impurities in the curing agent component; the second high-pressure metering pump 200b is further provided with a second low-pressure filter 701b at the feed end and a second high-pressure filter 702b at the discharge end, for filtering impurities in the resin component.

[0109] Preferably, the discharge end of the first high-pressure metering pump 200a is further connected to a first flowmeter 800a; the discharge end of the second high-pressure metering pump 200b is further connected to a second flowmeter 800b; and the discharge end of the third high-pressure metering pump 200c is further connected to a third flowmeter 800c.

[0110] Preferably, the first storage tank 300a and the second storage tank 300b are further connected to a vacuum pump 400 for degassing the resin component and the curing agent component.

[0111] Preferably, the first storage tank 300a is further connected to a first water temperature machine 703a, and the second storage tank 300b is further connected to a second water temperature machine 703b, so as to stabilize the temperature of the raw materials in the first storage tank 300a and the second storage tank 300b.

[0112] Preferably, the first hydraulic chamber 603a and the second hydraulic chamber 603b in the mixing nozzle 600 are in communication with the hydraulic pump station 100 for controlling the pressure in the first hydraulic chamber 603a and the second hydraulic chamber 603b.

[0113] Preferably, the resin component and the release agent component are mixed in the static mixer 900 and then enter the mixing nozzle 600 to be mixed with the curing agent component.

[0114] Preferably, the curing agent component is connected to the first mixing chamber 606 through the first stepless pressure regulating device 601a; the resin component is connected to the first mixing chamber 606 through the second stepless pressure regulating device 601b, thereby achieving mixing of the resin component and the curing agent component in the first mixing chamber 606.

[0115] During implementation, in the injection gap state, the curing agent component circulates among the first storage tank 300a, the feeding pump 500, the first low-pressure filter 701a, the first high-pressure metering pump 200a, the first high-pressure filter 702a, the first flow meter 800a, the mixing nozzle 600, and the first storage tank 300a; the resin component circulates among the second storage tank 300b, the second low-pressure filter 701b, the second high-pressure metering pump 200b, the second high-pressure filter 702b, the second flow meter 800b, the static mixer 900, the mixing nozzle 600, and the second storage tank 300b; the liquid resin C does not circulate;

[0116] In the glue injection state, the curing agent component enters the mixing nozzle 600 through the first storage tank 300a, the feeding pump 500, the first low-pressure filter 701a, the first high-pressure metering pump 200a, the first high-pressure filter 702a, and the first flowmeter 800a; the resin component enters the static mixer 900 through the second storage tank 300b, the second low-pressure filter 701b, the second high-pressure metering pump 200b, the second high-pressure filter 702b, and the second flowmeter 800b; the release agent component enters the static mixer 900 through the third storage tank 300c, the third high-pressure metering pump 200c, and the third flowmeter 800c, and is mixed with the resin component before entering the mixing nozzle 600, and is further mixed with the curing agent component before being injected into the molding mold matching the mixing nozzle 600.

[0117] On the other hand, the present application discloses a composite material, comprising a base material layer and a protective layer, wherein the protective layer can be obtained by injection molding the above three-component resin on the base material layer.

[0118] Alternatively, the injection molding process may be high pressure resin transfer molding (HP-RTM).

[0119] On the other hand, the present application discloses a composite material molding system, comprising the above-mentioned glue injection device and an in-mold molding mold that uses the glue injection device to match the glue injection.

[0120] Specifically, the in-mold forming mold includes: a punch and a die that cooperate with each other, a sealing plate located between the punch and the die, and a sealing plate pushing device; the punch and the die can move away from or closer to each other, and when the punch and the die are slightly opened, the sealing plate pushing device seals and fixes the sealing structure to the punch.

[0121] The in-mold forming mold comprises:

[0122] The die is provided with a cavity;

[0123] The sealing plate is an annular sealing plate in the form of an annular plate, and is embedded in the outer side of the cavity. An extension portion is provided on one side of the annular sealing plate, and the extension portion extends to the outer side of the concave mold. The first glue injection channel is provided on the surface of the extension portion facing the convex mold;

[0124] The vacuum channel is arranged in the die and on the opposite side of the extension portion, and includes a transverse channel and a vertical channel. The transverse channel opens on the side of the die, and the vertical channel opens between the cavity and the annular sealing plate.

[0125] The sealing plate pushing device includes: a sealing plate push rod, a sealing plate push rod fixing plate, a sealing plate oil cylinder, and a sealing plate push rod push plate;

[0126] The sealing plate push rod is arranged inside the die, and its lower end is plugged and fixedly connected to the sealing plate;

[0127] The sealing plate push rod fixing plate is arranged on the upper side of the concave mold and connected to the upper end of the sealing plate push rod;

[0128] The sealing plate oil cylinder is arranged on the upper side of the push rod fixing plate and is connected to the sealing plate push rod fixing plate;

[0129] The sealing plate push plate is located between the sealing plate oil cylinder and the sealing plate push rod fixing plate;

[0130] The sealing plate cylinder can drive the sealing plate push rod fixing plate and the sealing plate push rod push plate to move up and down relative to the piston under external power, pushing the sealing plate push rod into and out of the die, thereby pushing the annular sealing plate to fit and leave the punch.

[0131] Specifically, as shown in FIG5 to FIG10 , the die includes a male mold 0100 and a female mold 0200 that cooperate with each other. The male mold 0100 and the female mold 0200 can move away from or toward each other to realize the opening and closing of the mold.

[0132] Specifically, a sealing plate is provided between the punch and the die, and the in-mold forming mold includes a sealing plate pushing device; the punch and the die can move away from or towards each other, and when the punch and the die are slightly opened, the sealing plate pushing device seals and fixes the sealing structure to the punch.

[0133] Specifically, when the punch and die are slightly opened, the punch is displaced 0.1 mm to 2 mm relative to the die.

[0134] Specifically, a cavity is provided on the female mold 0200 .

[0135] The present application sets mutually cooperating punches and die, and a sealing plate and a sealing plate pushing device located between the punches and die in the forming mold. In addition to performing molding operations such as product injection molding and molding, the sealing plate pushing device can also be used to seal and fix the sealing structure to the punch when the punch and die are slightly opened, and perform a protective layer composite operation on one side of the product, thereby realizing the composite and curing of the protective layer in the mold, greatly improving work efficiency, and facilitating continuous production.

[0136] It should be noted that in-mold molding consists of two main steps:

[0137] First, the product is formed in the mold cavity by injection molding, compression molding or other in-mold molding processes;

[0138] Secondly, the punch and die are slightly opened to separate the two molds, and the product is separated along with the punch and die, leaving space between the product and the die cavity as the protective layer molding area. At the same time, the sealing plate pushing device seals and fixes the sealing structure to the punch, so that the protective layer molding area constitutes a sealed environment for the protective layer molding operation.

[0139] Specifically, the sealing plate is an annular sealing plate in the shape of a ring plate, which is snap-fitted and embedded in the outer side of the cavity. An extension portion is provided on one side of the annular sealing plate, which extends to the outer edge of the die. The first glue injection channel is provided on the surface of the extension portion facing the punch.

[0140] Specifically, either the punch 0100 or the die 0200 can be a movable die, and the corresponding die 0200 or punch 0100 can be a fixed die. This application is explained by taking the punch 0100 as the movable die and the die 0200 as the fixed die as an example.

[0141] Specifically, the male mold 0100 is provided with a core 110, and the female mold 0200 is provided with a cavity 0210. One side of the core 110 of the male mold 0100 cooperates with one side of the cavity 0210 of the female mold 0200 to form a mold cavity for molding and / or protective layer molding.

[0142] The in-mold forming mold further includes a vacuum sealing glue injection system, and the vacuum sealing glue injection system includes:

[0143] The annular sealing plate 0300 is in the shape of an annular plate and has a thickness of 1.1 mm to 4 mm. It is embedded and arranged on the outer side of the mold cavity 0210. The annular sealing plate 0300 includes a ring portion 0310, which is arranged to surround the outer side of the mold cavity 0210. The distance between the inner side of the ring portion 0310 and the outer circle of the mold cavity 0210 is 1 cm to 2 cm. An extension portion 0320 is provided on one side of the ring portion 0310, extending to the outer edge of the die 0200. A first glue injection channel 0321 is provided on the surface of the extension portion 0320 facing the punch 0100. The annular sealing plate 0300 can enclose the product 0800 in the mold cavity 0210, so that when the mold is slightly opened, the annular sealing plate 0300 can seal the mold cavity space formed by the product 0800 and the mold cavity 0210.

[0144] The vacuum channel 0400 is provided inside the die 0200 on the side opposite to the extension 0320 of the annular sealing plate 0300 and can be connected to an external vacuum pumping device. The vacuum channel 0400 can be a through hole with a diameter of 8 mm and can include a connected horizontal channel 0410 and a vertical channel 0420. One end of the horizontal channel 0410 opens on the side of the die 0200, and one end of the vertical channel 0420 opens between the mold cavity 0210 and the annular sealing plate 0300. It should be noted that although the drawings of this application illustrate the case where the horizontal channel and the vertical channel are perpendicular, this application is not limited thereto. The angle between the horizontal channel and the vertical channel can be greater than 90° or less than 90°, whichever is greater, so as to achieve vacuum pumping.

[0145] Specifically, a sealing ring 0330 is provided on the surface of the annular sealing plate 0300 facing the punch 0100 to achieve better sealing.

[0146] It should be noted that although this application is described using the cavity 0210 and the annular sealing plate 0300 as rectangles as an example, this application is not limited to this. Depending on the shape of the product 0800, the shape of the cavity 0210 is different, and the shape of the annular sealing plate 0300 is also different, so that the annular sealing plate 0300 can enclose the product and achieve sealing.

[0147] It should be noted that the distance between the inner side of the ring 0310 and the outer circle of the cavity 0210 is 1 cm to 2 cm, which reserves a margin for the product while leaving space for the setting of the vacuum channel.

[0148] Specifically, the in-mold molding mold provided by the present application, the punch 0100 and the die 0200 are combined into a mold. After the in-mold product is formed, the punch 0100 and the product 0800 are moved down 0.1mm to 2mm (protective layer thickness) to realize a slight opening of the mold. Then the annular sealing plate 0300 is moved down from the die 0200 to fit with the punch 0100, and the product is enclosed at the same time. Then the vacuum channel 0400 vacuums the gap enclosed by the annular sealing plate 0300 through an external vacuum equipment. At the same time, the first glue injection channel 0321 injects resin into the cavity 0210 to inject glue into the product 0800.

[0149] The in-mold molding mold provided in this application integrates a vacuum sealing injection system on the molding mold, which can realize direct in-mold injection molding, provide a vacuum environment for injection, prevent bubbles on the product surface, and form a high-gloss, high-gloss product.

[0150] It should be noted that the in-mold molding mold provided in this application integrates the protective layer molding in the molding mold, and the molding mold can be an injection molding mold, a compression molding mold, an SMC molding mold, an RTM molding mold, etc.

[0151] Specifically, for example, when the molding mold is an injection molding or resin transfer molding (RTM) mold, an injection hole 0111 may be provided at the core 110 of the male mold 0100 to connect to an external injection molding device. The male mold 0100 and the female mold 0200 are joined together for injection molding, and after molding, the mold is slightly opened for glue injection.

[0152] Specifically, for example, when the molding die is a compression molding die or a sheet molding compound (SMC) molding die, the male die 0100 and the female die 0200 are combined to mold the product, and after molding, the mold is slightly opened for glue injection.

[0153] Specifically, the vacuum sealing glue injection system may further include a vacuum channel opening and closing device 0500, including:

[0154] The vacuum valve push rod 0510 is arranged inside the die 0200, with its lower end inserted into the vertical channel 0420 of the vacuum channel 0400, and is used to open and close the vacuum channel 0400;

[0155] The vacuum valve cylinder 0520 is located above the die 0200 and is connected to the upper end of the vacuum valve push rod 0510. Specifically, a vacuum valve piston 0521 is also located within the vacuum valve cylinder 0520 and connected to the upper end of the vacuum valve push rod 0510. The vacuum valve piston 0521 drives the vacuum valve push rod 0510 upward, out of the upper end of the vertical channel 0420, thereby opening the vacuum channel 0400.

[0156] Specifically, the sealing plate pushing device includes:

[0157] The sealing plate push rods 0610 are arranged inside the die 0200, with the lower ends plugged and fixedly connected to the sealing plate 0300. There are at least two sealing plate push rods 0610, preferably four, distributed on the upper sides of the four sides of the ring portion 0310;

[0158] The sealing plate push rod fixing plate 0620 is arranged on the upper side of the die 0200 and connected to the upper end of the sealing plate push rod 0610;

[0159] The sealing plate oil cylinder 0640 is arranged on the upper side of the push rod fixing plate 0620 and is connected to the sealing plate push rod fixing plate 0620.

[0160] Preferably, a sealing plate push rod push plate 0630 may be provided between the sealing plate oil cylinder 0640 and the sealing plate push rod fixing plate 0620 to make the movement of the sealing plate push rod 0610 more stable.

[0161] Specifically, a piston 0641 can also be set in the sealing plate cylinder 0640, with the upper end set in the sealing plate cylinder 0640 and the lower end fixedly connected to the die 0200. The piston 0641 passes through the sealing plate push rod fixing plate 0620 and the sealing plate push rod push plate 0630. The sealing plate cylinder 0640 can drive the sealing plate push rod fixing plate 0620 and the sealing plate push rod push plate 0630 to move up and down relative to the piston 0641 under external power.

[0162] It should be noted that during the molding process of the molded product, there is a gap space of 0.1mm to 2mm between the sealing plate push rod fixing plate 0620 and the upper surface of the die 0200 (not marked in the figure). When the mold is slightly opened, the sealing plate cylinder 0640 can drive the sealing plate push rod fixing plate 0620 and the sealing plate push rod push plate 0630 to move up and down, pushing the sealing plate push rod 0610 into and out of the die 0200, thereby pushing the annular sealing plate 0300 and the punch 0100 to fit together and leave, and realizing the gap adjustment and sealing between the annular sealing plate 0300 and the punch 0100. At this time, as a preference, the sealing plate push rod fixing plate 0620 and the sealing plate push rod push plate 0630 can be provided with a through hole (not shown) at the position of the vacuum valve cylinder 0520 to accommodate the vacuum valve cylinder 0520. The vacuum valve cylinder 0520 is arranged on the upper side of the die 0200 and does not move with the push rod fixing plate 0620 and the push rod push plate 0630. As another preference, the vacuum valve cylinder 0520 can be arranged on the upper side of the sealing plate push rod push plate 0630. Since the moving distance of the sealing plate push rod fixing plate 0620 is small (0.1mm~2mm), the up and down movement of the vacuum valve cylinder 0520 does not affect the opening and closing of the vacuum channel 0400 by the vacuum valve push rod 0510.

[0163] Specifically, the in-mold forming mold of the present application also includes an ejection mechanism for ejecting the product after the mold is opened, including:

[0164] The ejector rods 0710 are arranged inside the punch 0100 at the corresponding position of the cavity 0210, and can penetrate the core 110 and the upper surface of the punch 0100 and protrude. Preferably, there are 8 ejector rods, which are distributed at the four corners of the core and the four corners of the cavity.

[0165] The ejector rod fixing plate 0720 is provided on the lower side of the punch 0100 and connected to the other end of the ejector rod 0710;

[0166] The ejection cylinder 0740 is provided on the side of the punch 0100 and is connected to the ejection push rod fixing plate 0720 .

[0167] Preferably, an ejector plate 0730 may be provided on the lower side of the ejector rod fixing plate 0720 and connected to the ejector oil cylinder 0740 to make the movement of the ejector rod 0710 more stable.

[0168] Specifically, the in-mold forming mold of the present application also includes a punch fixing plate 0120, which is disposed below the punch 0100 and connected to the punch 0100 to secure the punch 0100; a punch spacer 0130, which is disposed below the punch fixing plate 0120 to reserve space for the ejector rod fixing plate 0720 and the ejector push plate 0730; and a punch mold base 0140, which is disposed below the punch spacer 0130 to stabilize the mold.

[0169] Specifically, the in-mold forming mold of the present application also includes a die pad 0220, which is arranged on the upper side of the die 0200 and is used to reserve space for the sealing plate push rod fixing plate 0620 and the sealing plate push rod push plate 0630; a die base 0230, which is arranged on the upper side of the die pad 0220 and is used to stabilize the mold.

[0170] Specifically, the second glue injection channel 0150 can also be set at the corresponding position of the punch 0100 and the first glue injection channel 0321. The first glue injection channel 0321 and the second glue injection channel 0150 can be combined to form a diameter of of through holes.

[0171] Specifically, the first glue injection channel 0321 and the second glue injection channel 0150 can be combined to have a diameter of The through hole is connected to the glue outlet hole. When glue injection is required, the resin enters the protective layer molding area inside the mold through the through hole formed by the first glue injection channel 0321 and the second glue injection channel 0150.

[0172] The following describes the working process of the in-mold forming mold provided by this application.

[0173] The punch 0100 and the die 0200 are closed together to perform injection molding, molding or other in-mold molding processes on the product 0800, so that the product 0800 is formed in the mold cavity; then, the punch 0100 and the product 0800 move toward the punch 0100 side, and the moving distance is the protective layer thickness of 0.1mm to 2mm, so that the mold is slightly open; the sealing plate cylinder 0640 moves downward relative to the piston 0641, and the sealing plate push rod fixing plate 0620 and the sealing plate push rod push plate 0630 drive the sealing plate push rod 0610 to push the sealing plate 0300 toward the punch 0100 side until the sealing ring 0330 is in contact with the punch 0100; at this time, the vacuum valve piston 0521 drives the vacuum valve push rod 0510 moves toward the side of the die 0200, the vacuum channel 0400 is opened, and the gap is vacuumed under external vacuum equipment; the resin is injected into the cavity 0210 through the first injection channel 0321 and the second injection channel 0150, the injection is completed, and the molding is cured. Then, the vacuum valve piston 0521 drives the vacuum valve push rod 0510 to move toward the side of the punch 0100, closing the vacuum channel 0400; the sealing plate cylinder 0640 moves upward so that the sealing plate push rod 0610 drives the annular sealing plate 0300 to move upward to the die 0200. After the mold is opened, the ejector plate 0730 and the ejector push rod 0710 eject the product 0800. At this time, the product with a bright protective layer is completed in the mold.

[0174] In another aspect, the present application discloses a composite material molding method, which uses the above molding system and includes the following steps:

[0175] Step 1: Combine the male and female molds to perform injection molding, compression molding or other in-mold molding processes to form the product in the mold cavity;

[0176] Step 2: Adjust the distance between the male and female mold surfaces so that the mold is slightly open, seal the mold space of the product's in-mold protective layer, and evacuate;

[0177] Step 3: Adjust the mixing nozzle to the injection state, and feed the deaerated resin component, curing agent component, and release agent into the mixing nozzle through the feeding device. After mixing, the three-component resin is obtained for the first molding;

[0178] Step 4: After the first molding, adjust the mixing nozzle to an intermittent state, wait for the resin to solidify, and after the mold is opened, eject the product to obtain the first protective layer molded product; the intermittent state satisfies: the resin component and the curing agent component are not mixed in the mixing nozzle and flow back to the storage device, and the release agent feeding is stopped;

[0179] Step 5: Repeat steps 1 to 4 to obtain the second molding, ..., N-th molding product.

[0180] Specifically, the three-component resin in step 1 is a three-component resin without a diluent solvent, and the viscosity after mixing (80° C.) is 800 mpas to 3000 mpas.

[0181] Compared with the existing technology, the three-component resin without dilution solvent can reduce the process time occupied by solvent volatilization and avoid surface quality defects of the protective layer caused by solvent volatilization.

[0182] Specifically, a vacuum sealing glue injection system can be set on the concave mold in step 2 to seal and vacuum the molding space formed after the mold is slightly opened, which can ensure the integrity and smoothness of the protective layer, thereby reducing the roughness of the product, improving the product quality, and forming a high-brightness, high-gloss product.

[0183] Specifically, the vacuum sealing and glue injection system may include an annular sealing plate that is snap-fitted and embedded on the outer side of the cavity of the die and a vacuum channel provided in the die. An extension portion is provided on one side of the annular sealing plate, extending to the outer edge of the die, and a glue injection channel is provided on the extension portion. In addition, the vacuum channel is provided on the opposite side of the extension portion, including a horizontal channel and a vertical channel that are interconnected. One end of the horizontal channel opens on the side of the die, and one end of the vertical channel opens between the cavity and the annular sealing plate. Specific steps may include:

[0184] S201: The annular sealing plate moves to the punch to seal the molding space formed by the product and the cavity.

[0185] S202: Evacuate the molding space through the vacuum channel.

[0186] Specifically, in step S201, the annular sealing plate is moved to the male mold by a sealing plate pushing device, and the sealing plate pushing device includes:

[0187] The sealing plate push rods 0610 are arranged inside the die 0200, with the lower ends plugged and fixedly connected to the sealing plate 0300. There are at least two sealing plate push rods 0610, preferably four, distributed on the upper sides of the four sides of the ring portion 0310;

[0188] The sealing plate push rod fixing plate 0620 is arranged on the upper side of the die 0200 and connected to the upper end of the sealing plate push rod 0610;

[0189] The sealing plate oil cylinder 0640 is arranged on the upper side of the push rod fixing plate 0620 and is connected to the sealing plate push rod fixing plate 0620.

[0190] Preferably, a sealing plate push rod push plate 0630 may be provided between the sealing plate oil cylinder 0640 and the sealing plate push rod fixing plate 0620 to make the movement of the sealing plate push rod 0610 more stable.

[0191] Specifically, a piston 0641 can also be set in the sealing plate cylinder 0640, with the upper end set in the sealing plate cylinder 0640 and the lower end fixedly connected to the die 0200. The piston 0641 passes through the sealing plate push rod fixing plate 0620 and the sealing plate push rod push plate 0630. The sealing plate cylinder 0640 can drive the sealing plate push rod fixing plate 0620 and the sealing plate push rod push plate 0630 to move up and down relative to the piston 0641 under external power.

[0192] Specifically, the vacuum degree in S202 is less than -0.1 MPa.

[0193] Specifically, in step 3, the resin can be injected into the mold cavity through the injection channel set on the annular sealing plate. As another preferred embodiment, an injection channel can also be set on the punch at a position corresponding to the injection channel on the annular sealing plate, and the resin can also be injected into the mold cavity through this injection channel, which can further ensure the flow rate of the resin.

[0194] Specifically, in step 3, the initial range of the feeding pressure of the molding die is 3 to 12 MPa. After the liquid resin fills the cavity, the pressure increases and reaches above 24 MPa.

[0195] Specifically, in step 3, adjusting the mixing nozzle to the glue injection state includes:

[0196] Adjust the movable push rod 602 so that the curing agent feed pipeline 01a and the resin feed pipeline 02a are connected to the first mixing chamber 606. At the same time, the resin feed pipeline 02a is connected to the release agent feed pipeline 03, so that the release agent and the resin component are mixed and then mixed with the curing agent component in the first mixing chamber 606 to prepare a three-component resin.

[0197] Preferably, the release agent is premixed with the resin component by a static mixer 900 .

[0198] Specifically, the mixing pressure in the first mixing chamber 606 is in the range of 12 MPa to 18 MPa; the mixing pressure of the release agent and the resin component in the static mixer 900 is in the range of 13 MPa to 18 MPa.

[0199] Specifically, in step 4, adjusting the mixing nozzle to an intermittent state includes:

[0200] Adjust the movable push rod 602 so that the first groove 605a is connected to the curing agent feed pipeline 01a and the curing agent return pipeline 01b at the same time, and the curing agent feed is returned through the curing agent return pipeline 01b. At the same time, the second groove 605b is connected to the resin feed pipeline 02a and the resin return pipeline 02b, and the resin feed is returned through the resin return pipeline 02b.

[0201] Specifically, after the mold is opened in step 4, the product is ejected, including:

[0202] S411: Vacuum channel closed;

[0203] S412: The annular sealing plate moves up to the die;

[0204] S413: Mould opening and product ejection.

[0205] Specifically, an ejection mechanism can be provided in the punch to eject the product after the glue injection is completed.

[0206] Among them, the ejection mechanism is used to eject the product after the mold is opened, including:

[0207] The ejector rods 0710 are arranged inside the punch 0100 at the corresponding position of the cavity 0210, and can penetrate the core 110 and the upper surface of the punch 0100 and protrude. Preferably, there are 8 ejector rods, which are distributed at the four corners of the core and the four corners of the cavity.

[0208] The ejector rod fixing plate 0720 is provided on the lower side of the punch 0100 and connected to the other end of the ejector rod 0710;

[0209] The ejection cylinder 0740 is provided on the side of the punch 0100 and is connected to the ejection push rod fixing plate 0720 .

[0210] Preferably, an ejector plate 0730 may be provided on the lower side of the ejector rod fixing plate 0720 and connected to the ejector oil cylinder 0740 to make the movement of the ejector rod 0710 more stable.

[0211] Compared with the prior art, the present application realizes mixing of various components to prepare a usable three-component resin in the injection state, realizes reflux of two components of the three-component resin in the intermittent state, and removes the residual mixed glue in the injection state to avoid clogging of the mixing nozzle by the solidified resin.

[0212] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the scope of protection of the present application.

Claims

1. A three-component resin mixing nozzle, characterized in that: The three-component resin mixing nozzle comprises: a movable push rod, a first mixing chamber; The movable push rod can slide freely in the first glue mixing chamber along the inner wall of the first glue mixing chamber; The movable push rod is provided with a first groove and a second groove which are not connected to each other and extend along the sliding direction thereof; The three-component resin mixing nozzle also includes: a curing agent feeding pipeline, a curing agent return pipeline, a resin feeding pipeline, a resin return pipeline and a release agent feeding pipeline; The curing agent feed pipeline and the curing agent return pipeline are located on the same side of the first glue mixing chamber, the resin feed pipeline and the resin return pipeline are located on the same side of the first glue mixing chamber, and through holes are opened in the radial direction on the wall of the first glue mixing chamber, which are respectively connected to the curing agent feed pipeline, the curing agent return pipeline, the resin feed pipeline, and the resin return pipeline; The resin feed pipeline is in communication with the release agent feed pipeline; When the movable push rod slides along the inner wall of the first glue mixing chamber, the curing agent feed pipeline and the curing agent return pipeline can be connected through the first groove, the resin feed pipeline and the resin return pipeline can be connected through the second groove, and the curing agent feed pipeline and the resin feed pipeline can be connected to the first glue mixing chamber.

2. A three-component resin mixing nozzle according to claim 1, characterized in that: The three-component resin mixing nozzle further includes: a static mixer, and the release agent feed pipeline is connected to the resin feed pipeline through the static mixer.

3. A three-component resin mixing nozzle according to claim 2, characterized in that: The three-component resin mixing nozzle is provided with a stepless pressure regulating nozzle, and the curing agent feeding pipeline and the resin feeding pipeline are connected with the first mixing chamber through the stepless pressure regulating nozzle.

4. A three-component resin mixing nozzle according to claim 3, characterized in that: The discharge port of the static mixer is communicated with the feed port of the second stepless pressure regulating device.

5. A three-component resin mixing nozzle according to claim 4, characterized in that: The stepless pressure regulating nozzle comprises a nozzle, a spray needle valve body and a pressure setting device connected in sequence from bottom to top. The nozzle is provided with a spray port. The spray needle valve body is provided with a spray needle that can move up and down. The upper end of the spray needle is connected to the pressure setting device. The spray needle is adjusted to move up and down by the pressure setting device to stay away from or block the spray port.

6. A three-component resin injection device, characterized in that: include: A material storage device, a feeding device and a three-component resin mixing nozzle as described in any one of claims 1 to 5, wherein the feeding device injects three components of the three-component resin in the material storage device into the mixing nozzle for mixing to obtain the three-component resin.

7. A three-component resin injection device according to claim 8, characterized in that: include: The glue injection device also includes: a first material storage tank, a second material storage tank, a third material storage tank, a first high-pressure metering pump, a second high-pressure metering pump, and a third high-pressure metering pump; The first storage tank is used to store the curing agent component, and is connected to the mixing nozzle through the first high-pressure metering pump to realize the feeding of the curing agent component; the second storage tank is used to store the resin component, and is connected to the mixing nozzle through the second high-pressure metering pump to realize the feeding of the resin component; the third storage tank is used to store the release agent component, and is connected to the mixing nozzle through the third high-pressure metering pump to realize the feeding of the release agent component.

8. A composite material molding system, characterized in that: It comprises the glue injection device as claimed in claim 6 and an in-mold molding mold that uses the glue injection device to match the glue injection.

9. A composite material molding system according to claim 8, characterized in that: The in-mold forming mold includes: a mutually cooperating male mold, a female mold, a sealing plate located between the male mold and the female mold, and a sealing plate pushing device; the male mold and the female mold can move away from or close to each other, and when the male mold and the female mold are slightly opened, the sealing plate pushing device seals and fixes the sealing structure to the male mold.

10. A composite material molding method, characterized in that: Use the composite material molding system according to claim 8 or 9.

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