Injection molding device with surface modification structure

Abstract

The invention relates to an injection molding device with a surface modification structure. The injection molding device comprises a mold closing structure, a first injection assembly, a melting and mixing assembly and a second injection assembly, the mold closing structure comprises a mold closing bed body, a first mold plate, a second mold plate and a third mold plate, the first mold plate and the second mold plate are oppositely arranged on the mold closing bed body, the third mold plate is located between the first mold plate and the second mold plate, a first mold and a second mold are arranged on the first mold plate and the second mold plate respectively, and a third mold and a fourth mold are arranged on the two sides of the third mold plate respectively. 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; an injection machine barrel and a nozzle are arranged on the first injection assembly, and the nozzle is communicated with the second template; the melting and mixing assembly comprises a screw extruder and a melt buffer which are communicated with each other; and the second injection assembly is communicated with the first template. An on-line mixing technology, an injection compression technology, an in-mold modification technology and the like are integrated in the same injection molding device. Therefore, in one cycle, light-weight parts are finished by using modified formula mixing, injection compression technology and the like, and the requirements of the industry on high efficiency, light weight, carbon reduction, economy and ultimate surface are met.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to an injection molding device with a surface modification structure. Background Art

[0002] With the development of new energy vehicles, the structure and function of vehicle parts are becoming more and more complex. A vehicle part is generally composed of multiple materials and multiple parts. It not only requires compression foaming for lightweight design, but also requires modification of the appearance of vehicle parts. Therefore, the production process of vehicle parts is very complicated and requires coordination between multiple production process lines. This requires high mold precision for multiple production processes, resulting in low product quality and low production efficiency.

[0003] In-mold painting is a process that combines injection molding and reaction molding, integrating painting into the molding process of injection molding. Its special feature is that polyurethane (PUR) or polyurea (PUA) is used as a surface material to coat the injection molded product to modify the surface of the injection molded product. Compared with the traditional spraying process, in-mold painting effectively shortens the process flow, reduces production costs, has high design freedom, high gloss direct demoulding, no need for subsequent polishing, maximizes production efficiency, greatly improves the yield rate, compact design, and saves production space.

[0004] In order to solve this problem, a surface modified lightweight component molding equipment and method including an extrusion mixing system was developed. It loads the mixing equipment including screw extrusion onto the multi-component injection molding machine, and introduces compression technology with parallelism control function to complete the lightweight component substrate; a reaction molding system RIM equipment is installed on one side of the secondary injection platform to complete the in-mold modification technology of polyurethane; therefore, within one cycle, the modified formula mixing and injection compression technology are included to complete the lightweight component with PUR surface modification. It meets the industry's needs for high efficiency, lightweight, carbon reduction, economy, and extreme surface. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide an injection molding device with a surface modification structure to improve the production efficiency and production quality of injection molded products.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] An injection molding device with a surface modification structure, comprising:

[0008] A mold-closing structure, the mold-closing structure comprises a mold-closing bed, a first template and a second template arranged on the mold-closing bed relatively, 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 mold and the fourth mold are respectively provided on both sides of the third template, the third template is connected to the mold-closing bed, so that the mold-closing structure has a first mold-closing state and a second mold-closing state; in the first mold-closing state, the first mold is molded with the third mold, and the second mold is molded with the fourth mold; in the second mold-closing state, the first mold is molded with the fourth mold, and the second mold is molded with the third mold;

[0009] A first injection assembly, wherein the first injection assembly is provided with an injection barrel and a nozzle, the nozzle being in communication with the second mold plate and being used for injecting a first component material into the mold;

[0010] A melt mixing component, wherein the melt mixing component comprises a screw extruder and a melt buffer which are interconnected, wherein the screw extruder is used to heat and extrude the first component material, and the injection barrel is respectively connected to the melt buffer and the nozzle through a reversing valve;

[0011] The second injection assembly is connected to the first mold plate and is used for injecting a second component material into the mold.

[0012] In one embodiment, the injection molding device includes a finishing material mixing component, and the finishing material mixing component includes multiple raw material storage tanks and multiple flow meters. The raw material storage tanks are used to store different raw materials, and 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 meter.

[0013] In one embodiment, the modifying material mixing assembly further comprises a fluid pump, and the fluid pump is disposed between the flow meter and the raw material storage tank.

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

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

[0016] In one embodiment, the screw extruder comprises an extruder barrel and an extrusion screw, wherein the extruder screw is disposed in the extruder barrel, the extruder barrel is connected to the melt buffer, an extrusion heater is disposed on the extruder barrel, and a melting heater is disposed on the melt buffer.

[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 on the first mold and a first transmitter disposed on the third mold, and the second rangefinder includes a second receiver disposed on the second mold and a second transmitter disposed on the fourth mold;

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

[0020] In one embodiment, the first template and the third template are slidably connected to the mold bed, and the mold structure also 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 first template and the second template are relatively arranged in a first direction, and the installation position of the first driving member is collinear with the installation position of the first rangefinder and the second rangefinder in the first direction.

[0021] In one embodiment, the injection molding device includes a controller, which is electrically connected to the first driving member and the first rangefinder and the second rangefinder, respectively, and is used to control the first driving member according to the detection results of the first rangefinder and the second rangefinder.

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

[0023] 1. The above-mentioned injection molding device is provided with a clamping structure, a melt mixing component, a first injection component and a second injection component. During use, the screw extruder in the melt mixing component is first used to heat, melt and extrude the first component material. The first component material after heating and extrusion enters the melt buffer for storage, the clamping structure drives the first mold to close the mold with the third mold, the second mold to close the mold with the fourth mold, and then the first component material enters the first injection component again, enters the mold cavity between the second mold and the fourth mold through the first injection, and the first component material forms a product body between the second mold and the fourth mold. After the product is cooled and the first mold and the third mold are opened in place, the clamping structure rotates the third mold again, so that the fourth mold drives the product body to close the mold with the first mold, and the mixing head mounted on the first mold injects the surface modification material between the first mold and the fourth mold to form a modification layer on the product body. The injection and in-mold modification of the plastic substrate are realized in the same injection molding device, avoiding frequent mold replacement during the production process, which is conducive to improving product production efficiency and production quality.

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

[0025] 3. The modifying material mixing assembly includes a raw material storage tank and a flow meter. The raw material storage tank is provided with a raw material heating element. Therefore, the raw material is first heated in the raw material storage tank to reach a preset temperature and then quantitatively supplied through the flow meter. The raw material is mixed and kept warm in the mixing tank, which is beneficial to improve the mixing uniformity between various raw materials and thus improve product quality.

[0026] 4. The two molds of the clamping structure are respectively provided with a first distance meter and a second distance meter. No matter the clamping structure is in the first clamping state or the second clamping state, the first distance meter or the second distance meter can monitor the distance between the mold parting surfaces in real time, so that the compression process of the clamping structure is more accurate and controllable.

[0027] 5. Since a driving member and a controller are provided, the controller can control the first driving member according to the detection results of the first rangefinder and the second rangefinder, which is beneficial to adjust the driving force of the driving member in real time according to the detection results of the first rangefinder and the second rangefinder, thereby improving the control accuracy of the compression process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the injection molding device in the present invention.

[0029] Figure 2 It is a structural schematic diagram of the mold clamping structure in the present invention.

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

[0031] Figure 4 It is a schematic diagram of the structure of the modification material mixing assembly in the present invention.

[0032] 1. Injection molding device; 2. Clamping mold structure; 3. Clamping mold bed; 4. First template; 5. Second template; 6. Third template; 7. First mold; 8. Second mold; 9. Third mold; 10. First drive member; 11. First injection assembly; 12. Injection barrel; 13. Nozzle; 14. Melt mixing assembly; 15. Screw extruder; 16. Melt buffer; 17. Second injection assembly; 18. Second injection assembly; 19. First drive member; 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. Equipment body; 81. Controller; 82. Manipulator; 83. Infrared heater. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0034] An injection molding device 100 with a surface modification structure in some embodiments is described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 and Figure 2 As shown, in one embodiment, an injection molding device 100 with a surface modification structure is provided, comprising a clamping structure 10, a first injection assembly 20, a melt mixing assembly 30, and a second injection assembly 40;

[0036] The mold clamping structure 10 includes a mold clamping bed 11, a first template 12 and a second template 13 relatively arranged on the mold clamping bed 11, and a third template 14 located between the first template 12 and the second template 13, a first mold 15 and a second mold 16 are respectively arranged on the first template 12 and the second template 13, a third mold 17 and a fourth mold 18 are respectively arranged on both sides of the third template 14, and the third template 14 is connected to the mold clamping bed 11, so that the mold clamping structure 10 has a first mold clamping state and a second mold clamping state; in the first mold clamping state, the first mold 15 is molded with the third mold 17, and the second mold 16 is molded with the fourth mold 18; in the second mold clamping state, the first mold 15 is molded with the fourth mold 18, and the second mold 16 is molded with the third mold 17;

[0037] In addition, the first injection assembly 20 is provided with an injection barrel 21 and a nozzle 22, the nozzle 22 is connected to the second template 13, and is used to inject the first component material into the mold; the melt mixing assembly 30 includes a screw extruder 31 and a melt buffer 32 that are connected to each other, the screw extruder 31 is used to heat and extrude the first component material, and 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.

[0038] The above-mentioned injection molding device 100 is provided with a clamping structure 10, a melt mixing component 30, a first injection component 20 and a second injection component 40. During use, the screw extruder 31 in the melt mixing component 30 is first used to heat, melt and extrude the first component material. During the injection process of the first injection component 20 in the previous cycle, the first component material after heating and extrusion enters the melt buffer 32 for storage. After that, when the first injection component 20 enters the next plasticization stage, the first component material enters the first injection component 20 again. The clamping structure 10 drives the first mold 15 and the third mold 17 to clamp the mold. At the same time, after the second mold 16 and the fourth mold 18 are clamped, the first component material is injected into the mold cavity between the second mold 16 and the fourth mold 18 through the first injection component 20. The first component material is formed by injection compression between the second mold 16 and the fourth mold 18 to form a product body. After cooling and opening the mold, the clamping structure 10 rotates the third mold plate 14 again, so that the fourth mold 18 drives the product body to rotate and clamps with the first mold 15. At the same time, the second mold 16 is clamped with the third mold 17. The surface modification material mixing component 50 is injected into the space between the first mold 15 and the fourth mold 18 through the mixing head to form a modification layer on the product body. The first injection component is injected into the cavity between the second mold 16 and the third mold 17 again similar to the above process flow. In this way, the injection compression and in-mold modification processes are realized in the same injection molding device, avoiding frequent mold changes during the production process, which is beneficial to improving product production efficiency and production quality.

[0039] During the injection and pressure 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 that continuously and stably works in the screw extruder 31 system conveys the melt to the melt buffer 32, and at this time, the piston of the melt buffer moves upward;

[0040] After the injection and pressure holding process is completed, the nozzle 22 and the reversing valve are in position B, that is, the nozzle 22 is closed and the reversing valve connects the injection barrel 21 and the screw extruder 31 system, the melt buffer 32; at this time, the material storage state is entered, and the continuously working screw extruder 31 continuously transports the melt to the injection barrel 21. At the same time, the melt stored in the melt buffer 32 during the injection and pressure holding process is also transported to the injection barrel 21 under the movement of the piston. In this specific embodiment, the nozzle 22 is a locking nozzle, which is opened during the injection and pressure holding and closed during the material storage stage.

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

[0042] The manipulator 82 may include a six-axis manipulator and a clamping member connected thereto in conventional technology. The six-axis manipulator is used to improve the mobility and flexibility, and the clamping member is used to clamp the thermoplastic organic fiber board.

[0043] Specifically, Figure 1 and Figure 4 As shown, in one embodiment, the injection molding device 100 includes a modifying material mixing component 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 surface modifying materials. The raw material storage tanks 51 are connected to the mixing head through the flow meter 52.

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

[0045] Furthermore, if Figure 4As shown, in one embodiment, the finishing 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 finishing material mixing assembly 50 includes a mixing head, and two ends of the mixing head are connected to the flow meter 52 and the first mold 15 respectively.

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

[0048] The modifying material mixing assembly 50 includes a raw material storage tank 51 and a flow meter 52. The raw material storage tank 51 is provided with a raw material heating element, so the raw material is 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 is beneficial to improving the mixing uniformity between the various raw materials, thereby improving product quality.

[0049] The raw material storage tank 51 of the modifying material mixing assembly 50 is heated by a water jacket and the pipeline is insulated. The tank body allows the liquid component to enter the high-pressure pump room and the metering device through the feeding pump, and then connects to the mixing head through the pipeline. In the standby state, the two components (isocyanate and polyol are independent circuits respectively, 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 jets and injected into the mold cavity, flowing over the surface of the first injection product and solidifying to form a surface decoration effect.

[0050] Specifically, Figure 1 and Figure 3 As shown, in one embodiment, the screw extruder 31 includes an extrusion barrel and an extrusion screw, the extrusion screw is arranged in the extrusion barrel, the extrusion barrel is connected to the melt buffer 32, the extrusion barrel is provided with an extrusion heating element, and the melt buffer 32 is provided with a melting heating element.

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

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

[0053] Specifically, Figure 1 and Figure 2As shown, in one embodiment, the mold clamping structure 10 further includes a first rangefinder 60 and a second rangefinder 70, the first rangefinder 60 includes a first receiver 61 provided on the first mold 15 and a first transmitter 62 provided on the third mold 17, and the second rangefinder 70 includes a second receiver 71 provided on the second mold 16 and a second transmitter 72 provided on the fourth mold 18;

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

[0055] A first rangefinder 60 and a second rangefinder 70 are respectively provided on the two molds of the clamping structure 10. Regardless of whether the clamping structure 10 is in the first clamping state or the second clamping state, the first rangefinder 60 or the second rangefinder 70 can monitor the distance between the mold parting surfaces in real time, making the clamping process of the clamping structure 10 more controllable.

[0056] Furthermore, if Figure 2 As shown, in one embodiment, the first template 12 and the third template 14 are slidably connected to the clamping bed 11, and the clamping 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 relative setting direction of the first template 12 and the second template 13 is a first direction, and the installation position of the first driving member 19 is collinear with the installation position of the first rangefinder 60 and the second rangefinder 70 in the first direction.

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

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

[0059] Since the first driving member 19 and the controller 81 are provided, the controller 81 can control the first driving member 19 according to the detection results of the first rangefinder 60 and the second rangefinder 70, which is beneficial to adjust the driving force of the first driving member 19 in real time according to the detection results of the first rangefinder 60 and the second rangefinder 70, thereby improving the degree of automation of the clamping structure 10.

[0060] In this specific embodiment, the first rangefinder 60 and the second rangefinder 70 include magnetic induction electronic rulers, the transmitter is an induction magnetic block, the receiver receives the position information of the induction magnetic block and 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, which are respectively arranged in the four corner areas of the first template 12, and four first rangefinders 60 and second rangefinders 70 are also provided respectively. The first driving members 19 correspond to the first rangefinders 60 and the second rangefinders 70 one by one, and the first rangefinders 60, the second rangefinders 70 and the first driving members 19 at the corresponding installation positions are collinearly arranged along the first direction.

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

[0063] The first driving member 19 uses a high-pressure hydraulic cylinder to move the first template 12, has a greater driving force, and can be suitable 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, and 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] Among them, the mold 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 relatively arranged in the horizontal direction, and a plurality of pull rods are arranged between the first template 12 and the second template 13. A template bracket is provided on the slide rail, and the template bracket is rotatably connected to the third template 14, so that the third template 14 rotates around the vertical axis. Therefore, the mold structure 10 has a first mold state and a second mold state.

[0066] In one embodiment, a control method is also provided, which is applicable to an injection molding device 100 having a surface modification structure, and includes the following specific steps:

[0067] S1: When the mold clamping structure 10 is in the first mold clamping state, a plurality of first distance meters 60 and / or second distance meters 70 are calibrated at zero point;

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

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

[0070] S4: Acquire detection results of a plurality of first rangefinders 60 or second rangefinders 70 during the movement of the first template 12 and the third template 14;

[0071] S5: controlling the plurality of first driving members 19 so that the detection results of the plurality of first rangefinders 60 or the second rangefinders 70 are consistent;

[0072] S6: When the detection results of the plurality of first distance meters 60 or the second distance meters 70 reach the compression stroke, the first driving member 19 is controlled so that the third template 14 and the first template 12 remain relatively still;

[0073] S7: while the first template 12 and the third template 14 are stationary, obtaining detection results of the first rangefinders 60 or the second rangefinders 70;

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

[0075] The above control method is applicable to changing the gap between molds or maintaining the gap between molds during product injection molding or foaming. When changing the gap between molds, the controller 81 controls the multiple first driving members 19 by comparing the detection results between the multiple first rangefinders 60 or the second rangefinders 70, so that the detection results between the multiple first rangefinders 60 or the second rangefinders 70 remain dynamically consistent, thereby achieving parallelism between molds during movement; when maintaining the gap between molds, the controller 81 uses the preset mold compression stroke as a standard, compares the detection results of the first rangefinder 60 or the second rangefinder 70, and adjusts the driving force of the first driving member 19 in real time, ensuring that the detection results of the multiple first rangefinders 60 or the 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. The first driving member 19 acts as an upper and lower clamping force during conventional mold opening and closing. During the compression process, it cooperates with the second driving member to control parallelism. The third template 14 is driven to open and close the mold by the third driving member. During the compression process, when a specific parting surface is selected for compression, such as Figure 2 The parting surface between the third template 14 and the second template 13 is compressed, and the third template 14 will be close to the first template 12. The first driving member 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 during compression, thereby controlling the parallelism during the compression process.

[0077] In one embodiment, in step S1, the following steps are included:

[0078] Control the first driving member 19 so that the first template 12 and the third template 14 move close to the second template 13 to enter a mold clamping calibration state, and the calibration mold clamping force between the third template 14 and the first template 12 or the second template 13 is 50% of the maximum mold clamping force;

[0079] In the mold closing calibration state, a plurality of first distance measuring devices 60 and / or second distance measuring devices 70 are subjected to zero point calibration.

[0080] When performing zero-point calibration of the first rangefinder 60 or the second rangefinder 70, the 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 to cause the transition extrusion and deformation of the mold between the third template 14 and the first template 12 or the second template 13, and the clamping force will not be too small to cause the mold production gap between the third template 14 and the first template 12 or the second template 13 to be too large, which effectively improves the calibration accuracy and helps to improve the product production quality.

[0081] In one embodiment, in step S5, the following specific steps are included:

[0082] Select the first rangefinder 60 or the second rangefinder 70 as the rangefinder used as described below;

[0083] Select any used rangefinder as a target rangefinder, and rangefinders other than the target rangefinder as other rangefinders, and obtain a result difference between a detection result of the target rangefinder and a detection result of the other rangefinders;

[0084] The first driving member 19 at the corresponding installation position of the target rangefinder is controlled according to the result difference, so that the first template 12 and the third template 14 at the corresponding installation position are away from the second template 13.

[0085] In this specific embodiment, 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 will be close to the first template 12, corresponding to the first drive member 19 and the second drive member at the installation position, and the third template 14 works through the third drive member, so that the third template 14 and the first template 12 as a whole are far away (mold opening foaming process) or close to (injection compression process) the second template 13. 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 will be close to the second template 13, corresponding to the first drive member 19 and the second drive member at the installation position, and the third template 14 works through the third drive member, so that the first template 12 as a whole is far away (mold opening foaming process) or close to (injection compression process) the third template 14 and the second template 13 as a whole.

[0086] In one embodiment, the step of controlling the first driving member 19 corresponding to the installation position of the target rangefinder according to the result difference includes the following specific steps:

[0087] If the result difference satisfies the following relationship: d1-d2<-e, the driving force of the first driving member 19 corresponding to the installation position of the target rangefinder is controlled to decrease until the detection result of the target rangefinder satisfies the following relationship: -e≤d1-d2≤e;

[0088] If the result difference satisfies the following relationship: d1-d2>e, the driving force of the first driving member 19 corresponding to the installation position of the target rangefinder is controlled to increase until the detection result of the target rangefinder satisfies the following relationship: -e≤d1-d2≤e;

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

[0090] In one embodiment, in step S8, the following specific steps are included:

[0091] Select the first rangefinder 60 or the second rangefinder 70 as the rangefinder used as described below;

[0092] If the detection result of the rangefinder satisfies the following relationship: d<De, the driving force of the first driving member 19 corresponding to the installation position of the rangefinder is controlled to decrease 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 member 19 corresponding to the installation position of the rangefinder is controlled to increase until the detection result of the rangefinder satisfies the following relationship: De≤d≤D+e;

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

[0095] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0096] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0097] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0098] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0099] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0100] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An injection molding device with a surface modification structure, characterized in that: include: A mold clamping structure (10), the mold clamping structure (10) comprising a mold clamping bed (11), a first template (12) and a second template (13) arranged on the mold clamping bed (11) relative to each other, 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 (17) and the fourth mold (18) are respectively provided on both sides of the third template (14), the third template (14) is connected to the mold clamping bed (11), so that the mold clamping structure (10) has a first mold clamping state and a second mold clamping state; in the first mold clamping state, the first mold (15) is molded with the third mold (17), and the second mold (16) is molded with the fourth mold (18); in the second mold clamping state, the first mold (15) is molded with the fourth mold (18), and the second mold (16) is molded with the third mold (17); A first injection assembly (20), wherein the first injection assembly (20) is provided with an injection barrel (21) and a nozzle (22), wherein the nozzle (22) is connected to the second mold plate (13) and is used for injecting a first component material into the mold; A melt mixing component (30), the melt mixing component (30) comprising a screw extruder (31) and a melt buffer (32) which are connected to each other, the screw extruder (31) is used to heat and extrude the first component material, and the injection machine barrel (21) is connected to the melt buffer (32) and the nozzle (22) respectively through a reversing valve; A second injection assembly (40), the second injection assembly (40) is connected to the first mold plate (12) and is used for injecting a second component material into the mold.

2. The injection molding device with a surface modification structure according to claim 1, characterized in that: The injection molding device comprises a modifying material mixing assembly (50), wherein the modifying material mixing assembly (50) comprises a plurality of raw material storage tanks (51) and a plurality of flow meters (52), wherein 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 modifying material, and the raw material storage tanks (51) are connected to the first mold (15) via the flow meter (52).

3. The injection molding device with a surface modification structure according to claim 2, characterized in that: The modifying material mixing assembly (50) further comprises a fluid pump (53), wherein the fluid pump (53) is arranged between the flow meter (52) and the raw material storage tank (51).

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

5. The injection molding device with a surface modification structure according to claim 4, characterized in that: The raw material storage tank (51) and the mixing head are both provided with raw material heating elements.

6. The injection molding device with a surface modification structure according to claim 1, characterized in that: The screw extruder (31) comprises an extruder barrel and an extrusion screw, wherein the extrusion screw is arranged in the extruder barrel, the extruder barrel is connected to the melt buffer (32), an extrusion heating element is arranged on the extruder barrel, and a melting heating element is arranged on the melt buffer (32).

7. The injection molding device with a surface modification structure according to claim 6, characterized in that: The extruder barrel is provided with a feeding port, and the feeding port is provided with a loss-in-weight measuring scale.

8. The injection molding device with a surface modification structure according to claim 1, characterized in that: The mold clamping structure (10) further comprises a first rangefinder (60) and a second rangefinder (70), wherein the first rangefinder (60) comprises a first receiver (61) provided on the first mold (15) and a first transmitter (62) provided on the third mold (17), and the second rangefinder (70) comprises a second receiver (71) provided on the second mold (16) and a second transmitter (72) provided on the fourth mold (18); In the first mold closing state, the first receiver (61) receives the signal of the first transmitter (62) for detecting the distance between the parting surfaces of the first mold (15) and the third mold (17), and the second receiver (71) receives the signal of the second transmitter (72) for detecting 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 of the second transmitter (72) for detecting the distance between the parting surfaces of the first mold (15) and the fourth mold (18), and the second receiver (71) receives the signal of the first transmitter (62) for detecting the distance between the parting surfaces of the second mold (16) and the third mold (17).

9. The injection molding device with a surface modification structure according to claim 8, characterized in that: The first template (12) and the third template (14) are slidably connected to the mold bed (11); the mold closing structure (10) further comprises a first driving member (19) and a third driving member; the first driving member (19) is connected to the first template (12); the third driving member is connected to the third template (14); the first template (12) and the second template (13) are relatively arranged in a first direction; the installation position of the first driving member (19) is arranged in a colinear manner with the installation positions of the first rangefinder (60) and the second rangefinder (70) in the first direction.

10. The injection molding device with a surface modification structure according to claim 9, characterized in that: The injection molding device comprises a controller (81), wherein the controller (81) is electrically connected to the first driving member (19) and the first distance meter (60) and the second distance meter (70) respectively, and is used for controlling the first driving member (19) according to the detection results of the first distance meter (60) and the second distance meter (70).

Images