Injection molding device with surface modification structure

Abstract

The application relates to an injection molding device with a surface modification structure, comprising a mold closing structure, a first injection assembly, a melt mixing assembly and a second injection assembly; the mold closing structure comprises a mold closing bed body, a first mold plate and a second mold plate oppositely arranged on the mold closing bed body, and a third mold plate located between the first mold plate and the second mold plate, the first mold plate and the second mold plate are respectively provided with a first mold and a second mold, the third mold plate is provided with a third mold and a fourth mold on the two sides, the third mold plate is connected with the mold closing bed body, so that the mold closing structure has a first mold closing state and a second mold closing state; the first injection assembly is provided with an injection cylinder and a nozzle, the nozzle is communicated with the second mold plate; the melt mixing assembly comprises a screw extruder and a melt buffer which are communicated with each other; the second injection assembly is communicated with the first mold plate. The application integrates online mixing technology, injection compression technology, in-mold modification technology and the like in the same injection molding device. Therefore, in one cycle, a lightweight component is completed by containing modified formula mixing and injection compression technology and the like, and the needs of the industry for high efficiency, lightweight, carbon reduction, economy and extreme surface are met.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to an injection molding apparatus having a surface-modified structure. Background Technology

[0002] With the development of new energy vehicles, the structure and function of vehicle components are becoming increasingly complex. A vehicle component is generally composed of multiple materials and parts, requiring not only compression foaming for lightweight design but also aesthetic finishing. Therefore, the production process of vehicle components is extremely complex, requiring coordination between multiple production lines. This places high demands on the precision of molds used in these processes, resulting in low product quality and low production efficiency.

[0003] In-mold coating is a process that integrates injection molding and reaction molding, combining coating into the injection molding process. Its unique feature is the use of polyurethane (PUR) or polyurea (PUA) as a surface material coated onto the injection-molded product, providing an aesthetic finish. Compared to traditional spraying, in-mold coating effectively shortens the process flow, reduces production costs, offers greater design freedom, provides high-gloss finishes for direct demolding without subsequent polishing, maximizes production efficiency, significantly improves yield, and allows for compact design, saving production space.

[0004] To address this issue, a molding equipment and method for surface-modified lightweight components incorporating an extrusion compounding system has been developed. It integrates a screw extrusion blending unit onto a multi-component injection molding machine, while introducing compression technology combined with parallelism control to create the lightweight component substrate. A reaction molding (RIM) system is installed on one side of the injection stage to perform in-mold modification of polyurethane. Therefore, within a single cycle, the lightweight component is finished with PUR surface modification through modified formulation blending and injection compression technology. This meets the industry's demands for high efficiency, lightweighting, carbon reduction, economy, and a superior surface finish. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art and provide an injection molding apparatus with a surface modification structure, thereby improving the production efficiency and quality of injection molded products.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] An injection molding apparatus with a surface-modified structure, comprising:

[0008] A mold-closing structure includes a mold-closing bed, a first template and a second template disposed opposite to each other on the mold-closing bed, and a third template located between the first template and the second template. The first template and the second template are respectively provided with a first mold and a second mold. The third template has a third mold and a fourth mold respectively disposed on both sides. The third template is connected to the mold-closing bed, enabling the mold-closing structure to have a first mold-closing state and a second mold-closing state. In the first mold-closing state, the first mold and the third mold are closed together, and the second mold and the fourth mold are closed together. In the second mold-closing state, the first mold and the fourth mold are closed together, and the second mold and the third mold are closed together.

[0009] A first injection assembly is provided with an injection barrel and a nozzle, the nozzle being connected to the second template for injecting a first component material into the mold.

[0010] A melt mixing assembly, comprising a screw extruder and a melt buffer connected to each other, wherein the screw extruder is used to heat and extrude a first component material, and the injection barrel is connected to the melt buffer and a nozzle respectively via a reversing valve;

[0011] The second injection assembly is connected to the first template and is used to inject the second component material into the mold.

[0012] In one embodiment, the injection molding apparatus includes a modification material mixing assembly, which includes multiple raw material storage tanks and multiple flow meters. The raw material storage tanks are used to store different raw materials, and the multiple different raw materials are used to mix to form a second component material. The raw material storage tanks are connected to the first mold through the flow meters.

[0013] In one embodiment, the modification material mixing assembly further includes a fluid pump located between the flow meter and the raw material storage tank.

[0014] In one embodiment, the modification material mixing assembly includes a mixing head, the two ends of which are respectively connected to the flow meter and the first mold.

[0015] In one embodiment, both the raw material storage tank and the mixing head are equipped with raw material heating elements.

[0016] In one embodiment, the screw extruder includes an extruder barrel and an extruder screw, the extruder screw being disposed inside the extruder barrel, the extruder barrel being in communication with the melt buffer, the extruder barrel being provided with an extrusion heating element, and the melt buffer being provided with a melting heating element.

[0017] In one embodiment, the extruder barrel is provided with a feeding port, and the feeding port is provided with a loss-in-weight scale.

[0018] In one embodiment, the mold-closing structure further includes a first rangefinder and a second rangefinder. The first rangefinder includes a first receiver disposed in the first mold and a first transmitter disposed in the third mold. The second rangefinder includes a second receiver disposed in the second mold and a second transmitter disposed in the fourth mold.

[0019] In the first mold-closing state, the first receiver receives a signal from the first transmitter to detect the distance between the first mold and the parting surface of the third mold, and the second receiver receives a signal from the second transmitter to detect the distance between the second mold and the parting surface of the fourth mold; in the second mold-closing state, the first receiver receives a signal from the second transmitter to detect the distance between the first mold and the parting surface of the fourth mold, and the second receiver receives a signal from the first transmitter to detect the distance between the second mold and the parting surface of the third mold.

[0020] In one embodiment, the first template and the third template are slidably connected to the mold-closing bed. The mold-closing structure further includes a first driving member and a third driving member. The first driving member is connected to the first template, and the third driving member is connected to the third template. The direction in which the first template and the second template are arranged relative to each other is a first direction. The installation position of the first driving member is collinear with the installation positions of the first rangefinder and the second rangefinder in the first direction.

[0021] In one embodiment, the injection molding apparatus includes a controller, which is electrically connected to the first drive unit and the first and second rangefinders, respectively, and is used to control the first drive unit according to the detection results of the first and second rangefinders.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The above-mentioned injection molding device is equipped with a mold closing structure, a melt mixing component, a first injection component, and a second injection component. During use, the screw extruder in the melt mixing component first heats, melts, and extrudes the first component material. The heated and extruded first component material enters the melt buffer for storage. The mold closing structure drives the first mold and the third mold to close, and the second mold and the fourth mold to close. Then, the first component material enters the first injection component and enters the mold cavity between the second mold and the fourth mold through the first injection. The first component material forms the main body of the product between the second mold and the fourth mold. After the product cools and the first and third mold plates are in place, the mold closing structure rotates the third mold plate, causing the fourth mold to drive the main body of the product to close with the first mold. The mixing head mounted on the first mold injects surface decoration material between the first mold and the fourth mold, forming a decoration layer on the main body of the product. The injection of plastic substrate and in-mold decoration are realized in the same injection molding device, avoiding frequent mold changes during production, which is conducive to improving product production efficiency and quality.

[0024] 2. The injection molding device is also equipped with a modification material mixing component. The modification material mixing component stores and measures each component of the modification material, so that the multi-component materials are mixed evenly according to the ratio and injected into the mold cavity. The system module design is interconnected with the main equipment for unified control. The process is simple and the one-step molding production efficiency is high. It integrates the RIM polyurethane processing system to complete the surface decoration of lightweight parts. This process is controlled in the same way as the main equipment, the process is simple and the one-step molding production efficiency is high.

[0025] 3. The modification material mixing assembly includes a raw material storage tank and a flow meter. The raw material storage tank is equipped with a raw material heating element. Therefore, the raw materials are first heated in the raw material storage tank to reach the preset temperature and then quantitatively supplied through the flow meter. Mixing and heat preservation in the mixing tank helps to improve the mixing uniformity between various raw materials, thereby improving product quality.

[0026] 4. The two molds of the mold closing structure are equipped with a first distance measuring instrument and a second distance measuring instrument respectively. Regardless of whether the mold closing structure is in the first or second mold closing state, the first or second distance measuring instrument can monitor the distance between the mold parting surfaces in real time, making the compression process of the mold closing structure more precise and controllable.

[0027] 5. Because a drive unit and a controller are provided, the controller can control the first drive unit according to the detection results of the first and second rangefinders. This is beneficial for adjusting the driving force of the drive unit in real time according to the detection results of the first and second rangefinders, thereby improving the control accuracy of the compression process. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the injection molding device in this invention.

[0029] Figure 2 This is a schematic diagram of the mold-closing structure in this invention.

[0030] Figure 3 This is a schematic diagram of the structure of the melt mixing component and the first injection component in this invention.

[0031] Figure 4 This is a schematic diagram of the structure of the modified material mixing component in this invention.

[0032] Reference numerals: 100, Injection molding device; 10, Mold closing structure; 11, Mold closing bed; 12, First mold plate; 13, Second mold plate; 14, Third mold plate; 15, First mold; 16, Second mold; 17, Third mold; 18, Fourth mold; 19, First drive component; 20, First injection assembly; 21, Injection barrel; 22, Nozzle; 30, Melt mixing assembly; 31, Screw extruder; 32, Melt buffer; 40, Second injection assembly; 50, Modifying material mixing assembly; 51, Raw material storage tank; 52, Flow meter; 53, Fluid pump; 60, First rangefinder; 61, First receiver; 62, First transmitter; 70, Second rangefinder; 71, Second receiver; 72, Second transmitter; 80, Main body of equipment; 81, Controller; 82, Robotic arm; 83, Infrared heater. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0034] The following describes in detail, with reference to the accompanying drawings, an injection molding apparatus 100 having a surface-modified structure in some embodiments.

[0035] like Figure 1 and Figure 2 As shown, in one embodiment, an injection molding apparatus 100 with a surface-modified structure is provided, including a mold closing structure 10, a first injection component 20, a melt mixing component 30, and a second injection component 40;

[0036] The mold-closing structure 10 includes a mold-closing bed 11, a first template 12 and a second template 13 disposed opposite to each other on the mold-closing bed 11, and a third template 14 located between the first template 12 and the second template 13. The first template 12 and the second template 13 are respectively provided with a first mold 15 and a second mold 16. The third template 14 is provided with a third mold 17 and a fourth mold 18 on both sides. The third template 14 is connected to the mold-closing bed 11, so that the mold-closing structure 10 has a first mold-closing state and a second mold-closing state. In the first mold-closing state, the first mold 15 and the third mold 17 are closed, and the second mold 16 and the fourth mold 18 are closed. In the second mold-closing state, the first mold 15 and the fourth mold 18 are closed, and the second mold 16 and the third mold 17 are closed.

[0037] Furthermore, the first injection assembly 20 is provided with an injection barrel 21 and a nozzle 22, the nozzle 22 being connected to the second template 13 for injecting the first component material into the mold; the melt mixing assembly 30 includes a screw extruder 31 and a melt buffer 32 connected to each other, the screw extruder 31 being used to heat and extrude the first component material, and the injection barrel 21 being connected to the melt buffer 32 and the nozzle 22 respectively through a reversing valve; the second injection assembly 40 is connected to the first template 12 for injecting the second component material into the mold.

[0038] The aforementioned injection molding apparatus 100 is equipped with a mold clamping structure 10, a melt mixing assembly 30, a first injection assembly 20, and a second injection assembly 40. During operation, the screw extruder 31 in the melt mixing assembly 30 heats, melts, and extrudes the first component material. During the previous injection cycle in the first injection assembly 20, the heated and extruded first component material is stored in the melt buffer 32. Then, when the first injection assembly 20 enters the next plasticizing stage, the first component material re-enters the first injection assembly 20. The mold clamping structure 10 drives the first mold 15 and the third mold 17 to close. Simultaneously, after the second mold 16 and the fourth mold 18 close, the first component material is injected into the mold cavity between the second mold 16 and the fourth mold 18 through the first injection assembly 20. The first component material is formed into the main body of the product through injection compression between the second mold 16 and the fourth mold 18. After cooling and mold opening, the mold closing structure 10 rotates the third template 14, causing the fourth mold 18 to rotate the main body of the product and close with the first mold 15. At the same time, the second mold 16 and the third mold 17 close. The decoration material mixing component 50 injects surface decoration material into the cavity between the first mold 15 and the fourth mold 18 through the mixing head, so that it forms a decoration layer on the main body of the product. The first injection component injects into the cavity between the second mold 16 and the third mold 17 again in a similar process. In this way, injection compression and in-mold decoration processes are realized in the same injection molding device, avoiding frequent mold changes during production, which is conducive to improving product production efficiency and quality.

[0039] During the injection holding process, the nozzle 22 and the reversing valve are in position A; at this time, the nozzle 22 is open, and the reversing valve isolates the injection barrel 21 from the melt buffer 32 and the screw extruder 31 system; the extruder in the screw extruder 31 system, which is working continuously and stably, delivers the melt to the melt buffer 32, at which time the piston of the melt buffer moves upward.

[0040] After the injection holding pressure process is completed, nozzle 22 and the reversing valve are in position B, i.e., nozzle 22 is closed, while the reversing valve connects the injection barrel 21, the screw extruder 31 system, and the melt buffer 32. At this time, the system enters the storage state. The continuously operating screw extruder 31 continuously delivers melt to the injection barrel 21. Simultaneously, the melt stored in the melt buffer 32 during the injection holding pressure process is also delivered to the injection barrel 21 by the movement of the piston. In this specific embodiment, nozzle 22 is a lock-type nozzle, which opens during the injection holding pressure process and closes during the storage stage.

[0041] Specifically, such as Figure 1 As shown, in one embodiment, it also includes an infrared heater 83 and a robot arm 82. The infrared heater 83 is used to heat the thermoplastic organic fiber board (such as glass fiber reinforced polypropylene with a fiber content of 47%). The robot arm 82 is used to hold and move the organic fiber board, moving the organic fiber board from the production line into the infrared heater 83. After heating in the infrared heater 83 is completed, the robot arm 82 moves the organic fiber board from the infrared heater 83 into the mold.

[0042] The robotic arm 82 may include a six-axis robotic arm and a gripper connected thereto, as is the case with conventional technology. The six-axis robotic arm is used to improve mobility, and the gripper is used to hold the thermoplastic organic fiberboard.

[0043] Specifically, such as Figure 1 and Figure 4 As shown, in one embodiment, the injection molding apparatus 100 includes a surface finishing material mixing assembly 50, which includes a plurality of raw material storage tanks 51 and a plurality of flow meters 52. The raw material storage tanks 51 are used to store different raw materials, and the plurality of different raw materials are used to mix to form a surface finishing material. The raw material storage tanks 51 are connected to the mixing head through the flow meters 52.

[0044] The injection molding device 100 is also equipped with a decorative material mixing component 50. The decorative material mixing component 50 stores and proportions multiple raw materials for decorative materials, so that the raw materials are directly mixed to form surface decorative materials. The materials are prepared on demand, realizing an integrated process of storage, proportioning and use. The process is simple and the production efficiency is high.

[0045] Furthermore, such as Figure 4As shown, in one embodiment, the modification material mixing assembly 50 further includes a fluid pump 53, which is disposed between the flow meter 52 and the raw material storage tank 51.

[0046] Furthermore, in one embodiment, the modification material mixing assembly 50 includes a mixing head, the two ends of which are respectively connected to the flow meter 52 and the first mold 15.

[0047] Furthermore, in one embodiment, both the raw material storage tank 51 and the mixing head are equipped with raw material heating elements.

[0048] The modification material mixing assembly 50 includes a raw material storage tank 51 and a flow meter 52. The raw material storage tank 51 is equipped with a raw material heating element. Therefore, the raw materials are first heated and melted in the raw material storage tank 51 and then quantitatively supplied through the flow meter 52. Mixing and heat preservation in the mixing tank helps to improve the mixing uniformity between various raw materials, thereby improving product quality.

[0049] The raw material storage tank 51 of the decorative material mixing component 50 is water-jacketed and the pipeline is insulated. The tank is fed by a feeding pump to allow the liquid components to enter the high-pressure pump room and metering device, and then connected to the mixing head through pipeline. In standby mode, the two components (isocyanate and polyol are independent circuits, and the product of the reaction after mixing is called polyurethane) circulate in their own circuits. When injection is required, the injection rod on the mixing head is opened, and the two components are mixed by high-pressure jet and injected into the mold cavity. The mixture flows over the surface of the first injected product and solidifies to form a surface decoration effect.

[0050] Specifically, such as Figure 1 and Figure 3 As shown, in one embodiment, the screw extruder 31 includes an extruder barrel and an extrusion screw. The extrusion screw is disposed inside the extruder barrel. The extruder barrel is connected to the melt buffer 32. An extrusion heating element is provided on the extruder barrel, and a melting heating element is provided on the melt buffer 32.

[0051] Furthermore, in one embodiment, the extruder barrel is provided with a feeding port, and the feeding port is provided with a loss-in-weight meter.

[0052] In this specific embodiment, the screw extruder 31 includes a twin-screw extruder 31 and a single-screw extruder 31, as long as it can realize the melt blending extrusion of the first component material.

[0053] Specifically, such as Figure 1 and Figure 2As shown, in one embodiment, the mold-closing structure 10 further includes a first rangefinder 60 and a second rangefinder 70. The first rangefinder 60 includes a first receiver 61 disposed on the first mold 15 and a first transmitter 62 disposed on the third mold 17. The second rangefinder 70 includes a second receiver 71 disposed on the second mold 16 and a second transmitter 72 disposed on the fourth mold 18.

[0054] In the first mold-closing state, the first receiver 61 receives the signal from the first transmitter 62 to detect the distance between the parting surfaces of the first mold 15 and the third mold 17, and the second receiver 71 receives the signal from the second transmitter 72 to detect the distance between the parting surfaces of the second mold 16 and the fourth mold 18. In the second mold-closing state, the first receiver 61 receives the signal from the second transmitter 72 to detect the distance between the parting surfaces of the first mold 15 and the fourth mold 18, and the second receiver 71 receives the signal from the first transmitter 62 to detect the distance between the parting surfaces of the second mold 16 and the third mold 17.

[0055] The two molds of the mold closing structure 10 are respectively equipped with a first distance measuring instrument 60 and a second distance measuring instrument 70. Regardless of whether the mold closing structure 10 is in the first mold closing state or the second mold closing state, the first distance measuring instrument 60 or the second distance measuring instrument 70 can monitor the distance between the mold parting surfaces in real time, making the mold closing process of the mold closing structure 10 more controllable.

[0056] Furthermore, such as Figure 2 As shown, in one embodiment, the first template 12 and the third template 14 are slidably connected to the mold-closing bed 11. The mold-closing structure 10 further includes a first driving member 19 and a third driving member. The first driving member 19 is connected to the first template 12, and the third driving member is connected to the third template 14. The direction in which the first template 12 and the second template 13 are arranged relative to each other is a first direction. The installation position of the first driving member 19 is collinear with the installation positions of the first rangefinder 60 and the second rangefinder 70 in the first direction.

[0057] In this specific embodiment, a second driving member is also provided on the side of the first template 12 near the second template 13, and the second driving member provides a constant mold opening force for the first template 12.

[0058] Furthermore, such as Figure 1 and Figure 2 As shown, in one embodiment, the injection molding apparatus 100 includes an equipment body 80, on which a controller 81 is provided. The controller 81 is electrically connected to the first drive member 19 and the first rangefinder 60 and the second rangefinder 70, respectively, and is used to control the first drive member 19 according to the detection results of the first rangefinder 60 and the second rangefinder 70.

[0059] Because of the first drive component 19 and the controller 81, the controller 81 can control the first drive component 19 according to the detection results of the first rangefinder 60 and the second rangefinder 70. This is beneficial to adjust the driving force of the first drive component 19 in real time according to the detection results of the first rangefinder 60 and the second rangefinder 70, thereby improving the automation level of the mold closing structure 10.

[0060] In this specific embodiment, the first rangefinder 60 and the second rangefinder 70 include a magnetic induction electronic ruler, the transmitter is an induction magnetic block, the receiver receives the position information of the induction magnetic block, converts the magnetic signal into distance information, and then transmits the distance information to the controller 81, with an accuracy of 0.01mm.

[0061] Furthermore, in one embodiment, four first driving members 19 are provided, respectively disposed in the four corner areas of the first template 12. Four first rangefinders 60 and four second rangefinders 70 are also provided. The first driving members 19 correspond one-to-one with the first rangefinders 60 and the second rangefinders 70. The first rangefinders 60 and the second rangefinders 70 are collinear with the first driving members 19 at the corresponding installation positions along the first direction.

[0062] Specifically, the first driving component 19 includes a high-pressure hydraulic cylinder, a proportional valve, and a hydraulic power source. The high-pressure hydraulic cylinder is located on the end face of the first template 12 away from the second template 13. The proportional valve is connected to the high-pressure hydraulic cylinder and the hydraulic power source respectively. The controller 81 is connected to the proportional valve and is used to control the flow rate and pressure of the proportional valve according to the detection results of the first rangefinder 60 and the second rangefinder 70.

[0063] The first drive unit 19 uses a high-pressure hydraulic cylinder to move the first template 12, which has greater driving force and can be used for larger and heavier molds. At the same time, the controller 81 can control the moving speed and distance of the high-pressure hydraulic cylinder by controlling the flow and pressure of the proportional valve, so that the control is more precise.

[0064] In this specific embodiment, a valve block is provided between the high-pressure hydraulic cylinder and the proportional valve, and a high-pressure valve block is provided between the proportional valve and the hydraulic power source.

[0065] The mold-closing bed 11 includes a slide rail, the second template 13 is fixedly connected to the slide rail, the first template 12 and the third template 14 are slidably connected to the slide rail, the first template 12 and the second template 13 are arranged opposite each other in the horizontal direction, and multiple tie rods are provided between the first template 12 and the second template 13. A template support is provided on the slide rail, and the template support is rotatably connected to the third template 14, so that the third template 14 rotates around the vertical axis. Therefore, the mold-closing structure 10 has a first mold-closing state and a second mold-closing state.

[0066] In one embodiment, a control method is also provided, applicable to an injection molding apparatus 100 with a surface-modified structure, comprising the following specific steps:

[0067] S1: When the mold closing structure 10 is in the first mold closing state, zero-point calibration is performed on multiple first rangefinders 60 and / or second rangefinders 70.

[0068] S2: Preset compression stroke of the first mold 15 and the third mold 17;

[0069] S3: Control the first driving component 19 and the third driving component to move the first template 12 and the third template 14 away from the second template 13;

[0070] S4: During the movement of the first template 12 and the third template 14, acquire the detection results of multiple first rangefinders 60 or second rangefinders 70;

[0071] S5: Control multiple first driving elements 19 to ensure that the detection results of multiple first rangefinders 60 or second rangefinders 70 are consistent;

[0072] S6: When the detection results of multiple first rangefinders 60 or second rangefinders 70 reach the compression stroke, control the first drive unit 19 so that the third template 14 and the first template 12 remain relatively stationary;

[0073] S7: During the process of the first template 12 and the third template 14 being stationary, acquire the detection results of multiple first rangefinders 60 or second rangefinders 70;

[0074] S8: Control multiple first drive units 19 so that the detection results of multiple first rangefinders 60 or second rangefinders 70 are consistent with the compression stroke.

[0075] The above control method is applicable to changing or maintaining the gap between molds during product injection molding or foaming. When changing the gap between molds, the controller 81 controls multiple first driving components 19 by comparing the detection results of multiple first rangefinders 60 or second rangefinders 70, so that the detection results of multiple first rangefinders 60 or second rangefinders 70 remain dynamically consistent, thereby achieving parallelism between molds during movement. When maintaining the gap between molds, the controller 81 uses a preset mold compression stroke as a standard, compares the detection results of the first rangefinders 60 or second rangefinders 70, and adjusts the driving force of the first driving component 19 in real time to ensure that the detection results of multiple first rangefinders 60 or second rangefinders 70 are dynamically consistent with the mold compression stroke, thereby achieving higher product thickness uniformity.

[0076] In one embodiment, a plurality of first driving members 19 are arranged on the side of the first template 12 away from the second template 13. During normal mold opening and closing, the first driving members 19 act as upper and lower clamping forces. During the compression process, they work together with the second driving members to control parallelism. The third template 14 is driven to open and close via the third driving member. During the compression process, when a specific parting surface is selected for compression, such as in... Figure 2 The parting surface between the third template 14 and the second template 13 is compressed, and the third template 14 will be in close contact with the first template 12. During compression, the first driving component 19 will push the first template 12 and the third template 14 together to adjust the distance between the parting surface between the third template 14 and the second template 13, thereby controlling the parallelism during the compression process.

[0077] In one embodiment, step S1 includes the following steps:

[0078] Control the first driving component 19 to move the first template 12 and the third template 14 closer to the second template 13 and enter the mold closing calibration state. The calibration mold closing force between the third template 14 and the first template 12 or the second template 13 is 50% of the maximum mold closing force.

[0079] In the mold-closed calibration state, zero-point calibration is performed on multiple first rangefinders 60 and / or second rangefinders 70.

[0080] When performing zero-point calibration of the first rangefinder 60 or the second rangefinder 70, this control method sets the calibration clamping force between the third template 14 and the first template 12 or the second template 13 to 50% of the maximum clamping force. At this time, the clamping force will not be too large, which would cause the mold between the third template 14 and the first template 12 or the second template 13 to be over-compressed and deformed. Nor will the clamping force be too small, which would cause the mold production gap between the third template 14 and the first template 12 or the second template 13 to be too large. This effectively improves the calibration accuracy and helps to improve the product production quality.

[0081] In one embodiment, step S5 includes the following specific steps:

[0082] Choose either the first rangefinder 60 or the second rangefinder 70 as the rangefinder used below;

[0083] Select any one of the rangefinders used as the target rangefinder, and other rangefinders as other rangefinders. Obtain the difference between the detection results of the target rangefinder and the detection results of other rangefinders.

[0084] Based on the result difference, control the first drive component 19 of the target rangefinder at the corresponding installation position, so that the first template 12 and the third template 14 at the corresponding installation position are moved away from the second template 13.

[0085] In this specific embodiment, the mold opening foaming or injection compression occurs in the mold between the third template 14 and the second template 13. During the mold opening foaming or injection compression process, the third template 14 is in close contact with the first template 12. The first drive member 19 and the second drive member at the corresponding installation positions are also present. The third template 14 operates through the third drive member, causing the third template 14 and the first template 12 to move away from (the mold opening foaming process) or closer to (the injection compression process) the second template 13. The mold opening foaming or injection compression occurs in the mold between the third template 14 and the first template 12. During the mold opening foaming or injection compression process, the third template 14 is in close contact with the second template 13. The first drive member 19 and the second drive member at the corresponding installation positions are also present. The third template 14 operates through the third drive member, causing the first template 12 to move away from (the mold opening foaming process) or closer to (the injection compression process) the third template 14 and the second template 13.

[0086] In one embodiment, the first drive unit 19, which controls the installation position of the target rangefinder according to the result difference, includes the following specific steps:

[0087] If the difference in the results satisfies the following relationship: d1-d2<-e, the driving force of the first drive component 19 at the corresponding installation position of the target rangefinder is reduced until the detection result of the target rangefinder satisfies the following relationship: -e≤d1-d2≤e;

[0088] If the difference in the results satisfies the following relationship: d1-d2>e, the driving force of the first drive component 19 at the corresponding installation position of the target rangefinder is increased until the detection result of the target rangefinder satisfies the following relationship: -e≤d1-d2≤e;

[0089] Where d1 is the detection result of the target rangefinder, d2 is the detection result of other rangefinders besides the target rangefinder, and e is the allowable thickness deviation of the product, -0.1≤e≤0.1.

[0090] In one embodiment, step S8 includes the following specific steps:

[0091] Choose either the first rangefinder 60 or the second rangefinder 70 as the rangefinder used below;

[0092] If the detection result of the rangefinder satisfies the following relationship: d < De, the driving force of the first driving component 19 at the corresponding installation position of the rangefinder is reduced until the detection result of the rangefinder satisfies the following relationship: De ≤ d ≤ D + e;

[0093] If the detection result of the rangefinder satisfies the following relationship: d>D+e, the driving force of the first driving component 19 at the corresponding installation position of the rangefinder is increased until the detection result of the rangefinder satisfies the following relationship: De≤d≤D+e;

[0094] Where d is the detection result of any rangefinder, D is the compression stroke of the mold, e is the allowable thickness deviation of the product, and -0.1≤e≤0.1.

[0095] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0096] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0097] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0098] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0099] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0100] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An injection molding apparatus with a surface-modified structure, characterized in that, include: A mold-closing structure (10) includes a mold-closing bed (11), a first template (12) and a second template (13) disposed opposite to each other on the mold-closing bed (11), and a third template (14) located between the first template (12) and the second template (13). The first template (12) and the second template (13) are respectively provided with a first mold (15) and a second mold (16). The third template (14) is provided with a third mold (17) and a fourth mold (18) on both sides. The third template (14) is connected to the mold-closing bed (11), so that the mold-closing structure (10) has a first mold-closing state and a second mold-closing state. In the first mold-closing state, the first mold (15) is closed with the third mold (17), and the second mold (16) is closed with the fourth mold (18). In the second mold-closing state, the first mold (15) is closed with the fourth mold (18), and the second mold (16) is closed with the third mold (17). The first injection assembly (20) is provided with an injection barrel (21) and a nozzle (22), the nozzle (22) being connected to the second template (13) for injecting the first component material into the mold; The melt mixing assembly (30) includes a screw extruder (31) and a melt buffer (32) connected to each other. The screw extruder (31) is used to heat and extrude the first component material. The injection barrel (21) is connected to the melt buffer (32) and the nozzle (22) respectively through a reversing valve. The second injection assembly (40) is connected to the first template (12) and is used to inject the second component material into the mold. The mold-closing structure (10) further includes a first rangefinder (60) and a second rangefinder (70). The first rangefinder (60) includes a first receiver (61) disposed on the first mold (15) and a first transmitter (62) disposed on the third mold (17). The second rangefinder (70) includes a second receiver (71) disposed on the second mold (16) and a second transmitter (72) disposed on the fourth mold (18). In the first mold-closing state, the first receiver (61) receives the signal from the first transmitter (62) to detect the distance between the parting surface of the first mold (15) and the third mold (17), and the second receiver (71) receives the signal from the second transmitter (72) to detect the distance between the parting surface of the second mold (16) and the fourth mold (18); in the second mold-closing state, the first receiver (61) receives the signal from the second transmitter (72) to detect the distance between the parting surface of the first mold (15) and the fourth mold (18), and the second receiver (71) receives the signal from the first transmitter (62) to detect the distance between the parting surface of the second mold (16) and the third mold (17). The first template (12) and the third template (14) are slidably connected to the mold-closing bed (11). The mold-closing structure (10) also includes a first driving member (19) and a third driving member. The first driving member (19) is connected to the first template (12), and the third driving member is connected to the third template (14). The direction in which the first template (12) and the second template (13) are arranged relative to each other is the first direction. The installation position of the first driving member (19) is collinear with the installation positions of the first rangefinder (60) and the second rangefinder (70) in the first direction. The injection molding device includes a controller (81), which is electrically connected to the first drive unit (19), the first rangefinder (60), and the second rangefinder (70), respectively, and is used to control the first drive unit (19) according to the detection results of the first rangefinder (60) and the second rangefinder (70).

2. The injection molding apparatus with a surface-modified structure according to claim 1, characterized in that, The injection molding apparatus includes a finishing material mixing assembly (50), which includes multiple raw material storage tanks (51) and multiple flow meters (52). The raw material storage tanks (51) are used to store different raw materials, and the multiple different raw materials are used to mix to form a surface finishing material. The raw material storage tanks (51) are connected to the first mold (15) through the flow meters (52).

3. The injection molding apparatus with a surface-modified structure according to claim 2, characterized in that, The modification material mixing assembly (50) also includes a fluid pump (53) located between the flow meter (52) and the raw material storage tank (51).

4. The injection molding apparatus with a surface-modified structure according to claim 3, characterized in that, The modification material mixing assembly (50) includes a mixing head, the two ends of which are respectively connected to the flow meter (52) and the first mold (15).

5. The injection molding apparatus with a surface-modified structure according to claim 4, characterized in that, Both the raw material storage tank (51) and the mixing head are equipped with raw material heating elements.

6. The injection molding apparatus with a surface-modified structure according to claim 1, characterized in that, The screw extruder (31) includes an extruder barrel and an extrusion screw. The extrusion screw is located inside the extruder barrel. The extruder barrel is connected to the melt buffer (32). The extruder barrel is provided with an extrusion heating element, and the melt buffer (32) is provided with a melting heating element.

7. The injection molding apparatus with a surface-modified structure according to claim 6, characterized in that, The extruder barrel is equipped with a feeding port, and the feeding port is equipped with a loss-in-weight scale.

Images