An injection molding device for automotive plastic products

Abstract

The present application discloses an injection molding device for automotive plastic products, which relates to the technical field of injection molding equipment. It includes a machine table, a mold and a barrel sequentially arranged on the machine table, a feeding mechanism is arranged on the barrel, a glue-passing mechanism is also arranged on the barrel, a screw is movably arranged in the barrel, a driving mechanism for driving the screw to rotate is arranged on the machine table, and an injection mechanism for driving the screw to slide in the barrel is also arranged on the machine table. One end of the barrel close to the mold is set as a detection section, a detection mechanism for detecting the mixing degree of the colorant is arranged on the barrel at the detection section, and a stirring mechanism for stirring the molten plastic at the detection section is arranged on the screw. The present application has the effect of improving the appearance quality of automotive plastic products.

Description

Technical Field

[0001] This application relates to the technical field of injection molding equipment, and particularly relates to an injection molding device for automotive plastic products. Background Art

[0002] Because plastics have the advantages of being beautiful, lightweight, and conducive to production and processing, they have become crucial raw materials for vehicle manufacturing. Many components of automobiles, such as bumpers, the outer edges of fenders, radiator grilles, instrument panels, and decorative panels, are plastic products.

[0003] Plastic molding processes are the most commonly used processes in interior and exterior trim systems, with a wide variety. They mainly include injection molding processes, blow molding processes, skin molding processes, foaming processes, extrusion molding, etc. Conventional injection molding is high-pressure injection molding. Its working principle is that within a specified time, a certain amount of plastic particles are heated and plasticized by the injection system, and then, under a certain pressure and speed, the injection system injects the molten plastic into a closed mold cavity. After cooling and solidifying, the required plastic product is ejected after the mold is opened. The injection system consists of a plasticizing device and a power transmission device. The plasticizing device mainly consists of a feeding device, a barrel, a screw, a glue-passing component, and a nozzle part; the power transmission device includes an injection cylinder, an injection seat moving cylinder, and a screw driving device.

[0004] When injection molding automotive plastic products, first, plastic particles, colorants, etc. are added to the barrel through the feeding device at a certain ratio and speed, and the glue-passing component heats and melts the plastic particles; then, the screw driving device drives the screw to rotate in the barrel, and the rotating screw fully mixes the molten plastic with the colorant and pushes the mixed molten plastic to the nozzle; the injection cylinder injects the molten plastic with the colorant into the mold cavity through the nozzle for molding.

[0005] Regarding the above-related technologies, colorants for processing injection molded parts are divided into two types: pelletized and liquid. If liquid colorant is injected into the barrel, the viscosity of the plastic in the molten state is high, resulting in a slow diffusion rate of the colorant in the molten plastic. If the stirring time of the screw is too short, when the colorant has not been evenly dispersed in the molten plastic, the screw will push the molten plastic with the colorant to the nozzle. At this time, patterns will be generated on the workpiece after injection molding, affecting the appearance quality of automotive plastic products. Summary of the Invention

[0006] In order to improve the problem of patterns generated on automotive plastic products, this application provides an injection molding device for automotive plastic products.

[0007] An injection molding device for automotive plastic products provided by this application adopts the following technical solutions:

[0008] An injection molding device for automotive plastic products, comprising a machine platform, a mold and a barrel sequentially arranged on the machine platform. A feeding mechanism is arranged on the barrel, and a glue-passing mechanism is also arranged on the barrel. A screw is movably arranged in the barrel. A driving mechanism for driving the screw to rotate is arranged on the machine platform, and an injection mechanism for driving the screw to slide in the barrel is also arranged on the machine platform. One end of the barrel close to the mold is set as a detection section, and a detection mechanism for detecting the mixing degree of the colorant is arranged on the barrel at the detection section. A stirring mechanism for stirring the molten plastic at the detection section is arranged on the screw.

[0009] By adopting the above technical solutions, the feeding mechanism adds plastic particles and colorants into the barrel, the glue-passing mechanism heats and melts the plastic particles, the driving mechanism drives the screw to rotate in the barrel, and the rotating screw mixes the colorant with the molten plastic and also pushes the molten plastic towards the mold. When the molten plastic is pushed to the detection section of the barrel, the detection mechanism is started. The detection mechanism detects the mixing degree of the colorant in the molten plastic at the detection section. If the colorant is not evenly mixed, the stirring mechanism is started, and the stirring mechanism evenly mixes the molten plastic and the colorant at the detection section until the detection mechanism detects that the molten plastic and the colorant at the detection section are evenly mixed. Subsequently, the injection mechanism is started, and the injection mechanism drives the screw to slide in the barrel, so as to extrude the evenly mixed molten plastic at the detection section into the mold. After cooling and shaping, the required plastic product is ejected after the mold is opened. The injection molding device for automotive plastic products with the above structural design adds a detection mechanism and a stirring mechanism at the detection section, so that the colorant in the molten plastic extruded into the mold is evenly mixed, reducing the possibility of patterns on automotive plastic products and improving the appearance quality of automotive plastic products.

[0010] Optionally, the housing of the detection section is transparent. The detection mechanism includes a receiving panel coated on the outer shell of the detection section, a light emitter located in the detection section, and a processor located on the machine platform. The light emitted by the light emitter is received by the receiving panel, and both the receiving panel and the stirring mechanism are electrically connected to the processor.

[0011] By adopting the above technical solutions, the light emitter is started, and the light emitted by the light emitter penetrates the molten plastic and irradiates onto the receiving panel. The receiving panel transmits the received light intensity signal to the processor. The processor sets the light intensity that the receiving panel should receive after the colorant is evenly mixed. The processor compares the actually received signal with the preset signal to determine whether the molten plastic and the colorant in the detection section are evenly mixed. If the mixing is uneven, the processor will drive the stirring mechanism to start, and the stirring mechanism stirs the molten plastic in the detection section, so that the colorant is evenly mixed in the molten plastic.

[0012] Optionally, multiple sets of the light emitters are provided, and the multiple sets of light emitters are circumferentially spaced along the central axis of the screw.

[0013] By adopting the above technical solution, the multiple sets of light emitters are circumferentially spaced along the central axis of the screw, so that the distances from the multiple sets of light emitters to the receiving panel are the same. The receiving panel receives the light emitted by the multiple sets of light emitters, and the processor analyzes whether the intensities of the multiple optical signals are the same, thereby judging whether the colorant located on the circumferential side of the central axis of the screw is evenly dispersed.

[0014] Optionally, a cone is provided at one end of the screw close to the mold. The cone is coaxially arranged with the screw, and the multiple sets of light emitters are all located on the cone;

[0015] Each set of the light emitters is provided with a plurality of them, and the multiple light emitters in the same set are spaced along the generatrix direction of the cone.

[0016] By adopting the above technical solution, the light emitters are installed at one end of the screw through the cone, and the multiple light emitters in the same set are arranged along the generatrix direction of the cone, so that the multiple sets of multiple light emitters can enclose and form a plurality of rings that are coaxial with the screw but have different diameter sizes, thereby detecting and judging whether the colorants at different distances from the central axis of the screw in the barrel are evenly mixed.

[0017] Optionally, the screw is hollow, and the stirring mechanism includes a rotating rod that rotates coaxially and passes through the screw, a rotating member that drives the rotating rod to rotate, and stirring bars located on the circumferential wall of the cone. The cone is fixedly connected to one end of the rotating rod away from the screw, and the stirring bars protrude from the surface of the cone.

[0018] By adopting the above technical solution, when it is necessary to stir and mix the molten plastic and the colorant in the detection section, only need to start the rotating member. The rotating member drives the rotating rod to rotate, the rotating rod drives the cone to rotate, and the stirring bars rotate synchronously with the cone. At the same time, the stirring bars can disturb the molten plastic and the colorant at the detection section, thereby realizing the stirring of the molten plastic and the colorant.

[0019] Optionally, the stirring bars are provided as transparent cover shells. Embedding grooves are formed on the cone, and the multiple light emitters in the same set are all located in the embedding grooves, and the transparent cover shells cover the openings of the embedding grooves.

[0020] By adopting the above technical solution, the light emitters are embedded on the cone through the embedding grooves. The transparent cover shells can protect the light emitters, effectively avoiding damage to the light emitters. At the same time, the light emitted by the light emitters can penetrate the transparent cover shells and then irradiate onto the receiving panel, thereby realizing the purpose of monitoring the mixing condition of the colorant.

[0021] Optionally, one end of the barrel close to the mold is arranged in a flared shape adapted to the cone, and a translation member is provided on the machine table for driving the cone to reciprocate along the length direction of the barrel in the barrel;

[0022] The transparent cover is movably arranged on the cone along the depth direction of the slot, and an anti-collision structure is arranged at one end of the transparent cover close to the mold.

[0023] By adopting the above technical solution, when the translation member is started, the translation member drives the cone to move towards the mold, so that the molten plastic in the detection section is pushed into the mold by the cone. The end of the barrel is arranged in a flared shape. On the one hand, it is to increase the pressure when the molten plastic is injected into the mold. On the other hand, it is to be adapted to the cone so that the cone can be pushed as close to the mold as possible. When the cone is pushed to the flared opening, the transparent cover contacts the inner wall of the barrel through the anti-collision structure, so that the transparent cover is pushed into the slot without damaging the transparent cover, so that the cone is as close to the mold as possible, and the uniformly mixed molten plastic in the detection section is pushed into the mold as much as possible.

[0024] Optionally, a scraping member for scraping the side wall of the transparent cover is arranged on the cone at the position of the slot.

[0025] By adopting the above technical solution, when the transparent cover contacts the inner wall of the barrel through the anti-collision structure, as the cone continues to move towards the mold, the transparent cover is squeezed into the slot. During the movement of the transparent cover into the slot, the scraping member scrapes the molten plastic attached to the side wall of the transparent cover from the transparent cover, so that it is as evenly mixed with the coloring agent in the barrel as possible.

[0026] Optionally, a piston valve is slidably arranged in the barrel. When the stirring mechanism stirs the molten plastic at the detection section, the piston valve is sealed; when the injection mechanism drives the screw to slide in the barrel towards the mold, the cone follows the screw and slides synchronously under the drive of the translation member, and the piston valve is sealed; when the translation member drives the cone to slide away from the mold, the piston valve is opened.

[0027] By adopting the above technical solution, when the stirring mechanism stirs the molten plastic at the detection section, the piston valve is in a sealed state, so that the molten plastic on the side of the piston valve away from the mold cannot enter the molten plastic on the side of the piston valve close to the mold, ensuring that the molten plastic and the colorant in the detection section are uniformly mixed according to a predetermined ratio; when the uniform mixing of the molten plastic and the colorant in the detection section is completed, the injection mechanism and the translation member are started. When the injection mechanism pushes the screw and the translation member drives the cone to slide together in the direction close to the mold, the piston valve is in a sealed state, so that the molten plastic on the side of the piston valve close to the mold can be efficiently squeezed into the mold; when the translation member drives the cone to slide in the direction away from the mold, the piston valve is opened. At this time, a part of the molten plastic on the side of the piston valve away from the mold can enter the detection section in advance. As the screw rotates subsequently, the molten plastic can be gradually pushed into the detection section, thereby improving the transfer efficiency of the molten plastic.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. By adding a detection mechanism and a stirring mechanism in the detection section, the colorant in the molten plastic extruded into the mold is uniformly mixed, reducing the possibility of patterns on automotive plastic products and improving the appearance quality of automotive plastic products;

[0030] 2. Multiple groups of light emitters are circumferentially spaced along the central axis of the screw, so that the distances from the multiple groups of light emitters to the receiving panel are the same. The receiving panel receives the light emitted by the multiple groups of light emitters, and the processor analyzes whether the intensities of multiple light signals are the same, thereby judging whether the colorant on the circumferential side of the central axis of the screw is uniformly dispersed;

[0031] 3. Multiple groups of multiple light emitters can enclose to form multiple rings that share the same axis as the screw but have different diameter sizes, so as to detect and judge whether the colorant at different distances from the central axis of the screw in the barrel is uniformly mixed. Description of the Drawings

[0032] Figure 1 is the overall structural schematic diagram of the embodiment of the present application.

[0033] Figure 2 is the structural schematic diagram of the machine table, barrel, feeding mechanism, rubber-passing mechanism, detection mechanism and driving mechanism in the embodiment of the present application.

[0034] Figure 3 is the sectional structural schematic diagram of the barrel in the embodiment of the present application, mainly used to show the stirring mechanism and the screw.

[0035] Figure 4 is the exploded view of the cone, transparent cover, rotating rod and shut-off ring in the embodiment of the present application.

[0036] Figure 5It is a schematic structural diagram of the driving gear, the ring gear, the first motor, the first push rod, the fixed disk and the sliding disk in the embodiment of the present application.

[0037] Figure 6 is Figure 3 an enlarged schematic view of part A in

[0038] Figure 7 It is a sectional structural schematic diagram of the rotating rod, the screw rod and the piston valve in the embodiment of the present application, mainly used to show the intercepting ring and the overflow hole.

[0039] Reference numerals: 1, machine table; 2, barrel; 3, stirring mechanism; 31, rotating rod; 32, rotating part; 33, transparent cover; 4, feeding mechanism; 5, glue applying mechanism; 6, detecting mechanism; 61, receiving panel; 62, light emitter; 63, processor; 7, driving mechanism; 71, driving gear; 72, ring gear; 73, first motor; 8, injection mechanism; 81, first push rod; 82, fixed disk; 83, sliding disk; 9, detection section; 10, mold; 11, screw rod; 12, cone; 13, groove; 14, translation part; 15, anti-collision structure; 16, scraping part; 17, piston valve; 171, ferrule; 172, overflow ring; 18, intercepting ring; 19, overflow hole; 20, abutting block. Detailed implementation manners

[0040] The following will Figure 1-7 further describe the present application in detail.

[0041] The embodiment of the present application discloses an injection molding device for automobile plastic products. Referring to Figure 1 and Figure 2 , an injection molding device for automobile plastic products includes a machine table 1 and a mold 10 and a barrel 2 sequentially arranged on the machine table 1. One end of the barrel 2 close to the mold 10 is arranged in a flared shape, and the flare of the barrel 2 abuts and fits with the injection port of the mold 10, so that the chambers of the barrel 2 and the mold 10 are communicated. A feeding mechanism 4 is arranged on the barrel 2. The feeding mechanism 4 includes a plurality of hoppers. The number of hoppers is determined according to the number of types of components of the plastic product. In the embodiment of the present application, two hoppers are provided. The two hoppers are arranged on the machine table 1 at intervals along the length direction of the barrel 2, and both hoppers are communicated with the barrel 2. The hopper far from the mold 10 contains plastic particles, and the hopper close to the mold 10 contains liquid coloring agent.

[0042] Referring to Figure 1 and Figure 2, a plasticizing mechanism 5 is further provided on the barrel 2. The plasticizing mechanism 5 is specifically multiple heating rings wrapped around the outer peripheral wall of the barrel 2. The multiple heating rings can heat the barrel 2, so that the plastic particles in the barrel 2 are heated to a molten state. A screw 11 is movably arranged in the barrel 2. The screw 11 is hollow, and the central axis of the screw 11 is collinear with the central axis of the barrel 2. The spiral blade part of the screw 11 abuts against the inner wall of the barrel 2. A driving mechanism 7 for driving the screw 11 to rotate is provided on the machine table 1. The driving mechanism 7 drives the screw 11 to rotate in the barrel 2, so that the colorant is mixed with the molten plastic, and at the same time, the molten plastic is pushed in the direction close to the mold 10 under the push of the spiral blade.

[0043] Since the molten plastic needs to be extruded into the mold 10 under a certain pressure for cooling and forming, referring to Figure 3 and Figure 7 , a piston valve 17 is slidably arranged in the barrel 2. The piston valve 17 is annular, the piston valve 17 is coaxial with the barrel 2, and the outer diameter of the piston valve 17 is equal to the inner diameter of the barrel 2. The piston valve 17 is fixedly connected to one end of the screw 11 close to the mold 10. An injection mechanism 8 for driving the screw 11 to slide in the barrel 2 is further provided on the machine table 1.

[0044] To realize the reasonable layout of the injection mechanism 8 and the driving mechanism 7, in the embodiment of the present application, referring to Figure 5 , the injection mechanism 8 includes a first push rod 81, a fixed disk 82 and a sliding disk 83. The fixed disk 82 is vertically installed and fixed on the machine table 1, and the fixed disk 82 is located on the side of the barrel 2 away from the mold 10. The first push rod 81 is installed on the fixed disk 82; A plurality of connecting rods are fixedly installed between the fixed disk 82 and the barrel 2. The length direction of the connecting rods is the same as the length direction of the barrel 2. The sliding disk 83 is slidably arranged on the side of the fixed disk 82 close to the mold 10 through a plurality of connecting rods; The output end of the first push rod 81 passes through the fixed disk 82 and is fixedly connected to the sliding disk 83, and pushes the sliding disk 83 to reciprocate between the barrel 2 and the fixed disk 82.

[0045] Referring to Figure 5 , one end of the screw 11 away from the mold 10 passes through the barrel 2 and is rotatably connected to the sliding disk 83. The part of the screw 11 outside the barrel 2 is not provided with spiral blades. The driving mechanism 7 includes a driving gear 71, a gear ring 72 and a first motor 73; The gear ring 72 is fixedly sleeved on the screw 11. The driving gear 71 is rotatably installed on the sliding disk 83, and the driving gear 71 is meshed with the gear ring 72; The first motor 73 is fixedly installed on the sliding disk 83, and the output end of the first motor 73 passes through the sliding disk 83 and is coaxially fixed to the driving gear 71. The first motor 73 drives the driving gear 71 to rotate, and the driving gear 71 drives the screw 11 to rotate stably in the barrel 2 through the gear ring 72.

[0046] During the production of automotive plastic parts, plastic granules and colorant are first added to the barrel 2 in a predetermined ratio via the feeding mechanism 4. The gluing mechanism 5 and the driving mechanism 7 are then activated to melt the plastic granules and mix them with the colorant. The driving mechanism 7 then pushes the molten plastic toward the piston valve 17 via the screw 11. At this point, the piston valve 17 is open, allowing the molten plastic to flow through the valve and fill the barrel 2 on the side of the valve 17 near the mold 10. Subsequently, the injection mechanism 8 is activated, closing the valve 17. The injection mechanism 8 drives the screw 11 to slide within the barrel 2 toward the mold 10, causing the piston valve 17 to follow the screw 11 in synchronous motion. The molten plastic on the side of the piston valve 17 near the mold 10 is squeezed into the mold 10 at a predetermined pressure. After the molten plastic in the mold 10 cools and takes shape, the plastic product in the mold 10 is discharged.

[0047] In order to improve the appearance quality of the plastic product after molding, it is necessary to ensure that the molten plastic and the colorant squeezed into the mold 10 have been evenly mixed. Figure 2 The end of the barrel 2 near the mold 10 is provided with a detection section 9, which is located on the side of the barrel 2's bell mouth away from the mold 10. The shell of the detection section 9 is transparent. A detection mechanism 6 for detecting the degree of colorant mixing is provided on the barrel 2 at the detection section 9.

[0048] Reference Figure 3 and Figure 4 A cone 12 is provided at one end of the screw 11 close to the mold 10. The cone 12 is located on the side of the piston valve 17 away from the screw 11. The cone 12 is coaxially arranged with the screw 11. The tip of the cone 12 points in the direction of the mold 10, and the cone 12 is adapted to the bell mouth at the end of the barrel 2.

[0049] Reference Figure 1 、 Figure 2 and Figure 4 The detection mechanism 6 includes a receiving panel 61 covered on the outer shell of the detection section 9, a light emitter 62 located in the detection section 9, and a processor 63 located on the machine 1; the receiving panel 61 is cylindrical, and the cylindrical receiving panel 61 is arranged coaxially with the barrel 2. A plurality of embedding grooves 13 are provided on the cone 12, and the plurality of embedding grooves 13 are arranged at intervals along the circumference of the cone 12, and the length direction of the embedding grooves 13 is consistent with the direction of the generatrix of the cone 12. There are multiple groups of light emitters 62, and the multiple groups of light emitters 62 correspond one-to-one to the multiple embedding grooves 13; each group of light emitters 62 is provided with multiple light emitters, and the multiple light emitters 62 in the same group are arranged at intervals along the length direction of the embedding grooves 13. The light emitted by the light emitter 62 is received by the receiving panel 61, and the receiving panel 61 is electrically connected to the processor 63.

[0050] When detecting the mixing degree of the colorant in the molten plastic to be injected into the mold 10, the light emitter 62 is first activated. Multiple groups of multiple light emitters 62 can enclose to form multiple rings that are coaxial with the screw 11 but have different diameter sizes, so that the light rays emitted by the multiple light emitters 62 in the same group penetrate the molten plastic and irradiate onto the receiving panel 61. The receiving panel 61 transmits the signal to the processor 63, and the processor 63 analyzes whether the intensities of the multiple light signals in the same group are the same, and then judges whether the colorant located on the circumferential side of the central axis of the screw 11 is evenly dispersed.

[0051] If the colorant is not evenly mixed, it is necessary to further mix the colorant and the molten plastic. Therefore, referring to Figure 3 、 Figure 4 and Figure 5 A stirring mechanism 3 is provided on the screw 11 for stirring the molten plastic at the detection section 9. The stirring mechanism 3 includes a rotating rod 31 that rotates coaxially and slides through the screw 11, a rotating member 32 that drives the rotating rod 31 to rotate, and stirring bars located on the peripheral wall of the conical body 12. One end of the rotating rod 31 is arranged to pass through the piston valve 17, the conical body 12 is fixedly connected to the end of the rotating rod 31 away from the screw 11, and the stirring bars protrude from the surface of the conical body 12. In other embodiments, the stirring bars are arranged as metal rods, and the metal rods are riveted and fixed on the circumferential surface of the conical body 12 along the generatrix direction of the conical body 12. In the embodiment of the present application, the stirring bars are arranged as transparent cover shells 33. The transparent cover shells 33 are arranged to cover the notch of the groove 13, and the transparent cover shells 33 are elastically connected to the conical body 12 through a plurality of springs, and the transparent cover shells 33 can be movably arranged on the conical body 12 along the depth direction of the groove 13.

[0052] An anti-collision structure 15 is arranged at one end of the transparent cover shell 33 close to the mold 10. The anti-collision structure 15 is specifically a rounded corner arranged at the end of the transparent cover shell 33. A scraping member 16 for scraping the side wall of the transparent cover shell 33 is arranged on the conical body 12 at the groove 13. The scraping member 16 is specifically a rubber scraper, and the rubber scraper is embedded in the inner side wall of the groove 13. As the transparent cover shell 33 moves in the groove 13, the rubber scraper scrapes the side wall of the transparent cover shell 33, thereby reducing the accumulation of molten plastic on the inner wall of the groove 13.

[0053] When it is necessary to stir the colorant and the molten plastic, the rotating member 32 can be activated. The rotating member 32 drives the rotating rod 31 to rotate, the rotating rod 31 drives the conical body 12 to rotate, and the stirring bars rotate synchronously with the conical body 12. At the same time, the stirring bars can disturb the molten plastic and the colorant at the detection section 9, thereby realizing the stirring of the molten plastic and the colorant.

[0054] When stirring the molten plastic and the colorant at the detection section 9, there is a situation where part of the molten plastic or the colorant enters the detection section 9, thus affecting the mixing effect of the molten plastic and the colorant in the detection section 9. Therefore, when it is necessary to stir the molten plastic and the colorant at the detection section 9, the piston valve 17 is in a closed state. Refer to Figure 5 、 Figure 6 and Figure 7 , the piston valve 17 includes a ferrule 171 and an overflow ring 172. The outer ring of the ferrule 171 is slidably fitted with the inner wall of the barrel 2. The overflow ring 172 is coaxially welded and fixed inside the ferrule 171. The end of the ferrule 171 away from the cone 12 is welded to the end of the screw 11. A plurality of overflow holes 19 are penetrated through the side wall of the screw 11 near one end of the ferrule 171. A shut-off ring 18 is coaxially welded on the rotating rod 31. The outer diameter of the shut-off ring 18 is larger than the inner diameter of the overflow ring 172, and the outer diameter of the shut-off ring 18 is smaller than the inner diameter of the ferrule 171. The cone 12 is slidably inserted into the ferrule 171, and a plurality of abutting blocks 20 are integrally formed at the end of the cone 12. The abutting blocks 20 are movably abutted against the end face of the overflow ring 172 away from the shut-off ring 18, and the distance between the abutting blocks 20 and the shut-off ring 18 is larger than the thickness dimension of the overflow ring 172. One end of the rotating rod 31 away from the cone 12 passes through the sliding disk 83 and is located between the sliding disk 83 and the fixed disk 82. A translation member 14 is provided on the machine table 1 for driving the cone 12 to reciprocally slide along the length direction of the barrel 2 in the barrel 2 through the rotating rod 31.

[0055] When it is necessary to open the piston valve 17, by starting the translation member 14, the translation member 14 drives the rotating rod 31 to move away from the mold 10 relative to the ferrule 171, so that the abutting blocks 20 are pressed tightly against the overflow ring 172. At this time, the shut-off ring 18 is separated from the overflow ring 172, and the molten plastic on one side of the piston valve 17 can sequentially flow through the overflow holes 19, the middle of the overflow ring 172, and the gaps between the plurality of abutting blocks 20 and enter the other side of the piston valve 17. When it is necessary to close the piston valve 17, the translation member 14 drives the rotating rod 31 to move towards the mold 10 relative to the ferrule 171, so that the shut-off ring 18 is pressed tightly against the overflow ring 172, thereby realizing the closing of the piston valve 17.

[0056] To achieve a reasonable layout of the translation member 14 and the rotating member 32, refer to Figure 5 , a supporting bracket is installed on one side of the sliding disk 83 close to the fixed disk 82. The rotating member 32 is set as a second motor. The second motor is electrically controlled and connected to the processor 63. The second motor is slidably arranged on the supporting bracket along the length direction of the rotating rod 31, and the output end of the second motor is coaxially fixed to the rotating rod 31 through a coupling. The translation member 14 is set as a second push rod. The second push rod is electrically controlled and connected to the processor 63, and the second push rod is fixedly installed on the supporting bracket. The output end of the second push rod is connected to the second motor and pushes the second motor to reciprocally slide on the supporting bracket.

[0057] The implementation principle of the injection molding device for automotive plastic products in the embodiments of the present application is as follows: First, start the translation member 14, and the translation member 14 drives the rotating rod 31 to move away from the mold 10 relative to the ferrule 171, so that the abutting block 20 abuts tightly against the overflow ring 172. At this time, the intercepting ring 18 is separated from the overflow ring 172.

[0058] Then, plastic particles and colorants are added into the barrel 2 through the feeding mechanism 4. The plasticizing mechanism 5 heats and melts the plastic particles. The driving mechanism 7 drives the screw 11 to rotate in the barrel 2. The rotating screw 11 mixes the colorant with the molten plastic, and at the same time also pushes the molten plastic to flow through the overflow holes 19, the middle of the overflow ring 172, and the gaps between the plurality of abutting blocks 20 in sequence and enters the side of the piston valve 17 close to the mold 10, so that the molten plastic with colorant fills the detection section 9 of the barrel 2.

[0059] Then start the translation member 14, and the translation member 14 drives the rotating rod 31 to move towards the mold 10 relative to the ferrule 171, so that the intercepting ring 18 abuts tightly against the overflow ring 172, thereby closing the piston valve 17.

[0060] Next, start the injection mechanism 8 and the translation member 14. The injection mechanism 8 drives the screw 11 to slide towards the mold 10 in the barrel 2. At the same time, the cone 12 follows the screw 11 to slide synchronously under the drive of the translation member 14, so that the piston valve 17 is in a closed state. As the cone 12 moves, the light rays emitted by the plurality of light emitters 62 on the cone 12 penetrate the molten plastic and irradiate onto the receiving panel 61. The receiving panel 61 transmits the signal to the processor 63, and the processor 63 analyzes whether the intensities of the multiple optical signals in the same group are the same, and further determines whether the colorant located on the circumference of the central axis of the screw 11 is evenly dispersed.

[0061] If the colorant is not evenly mixed, the processor 63 drives the rotating member 32 to start. The rotating member 32 drives the rotating rod 31 to rotate. The rotating rod 31 drives the cone 12 to rotate, and the stirring bar rotates synchronously with the cone 12. At the same time, the stirring bar can disturb the molten plastic and the colorant at the detection section 9, thereby realizing the stirring of the molten plastic and the colorant until the molten plastic and the colorant in the detection section 9 are evenly mixed.

[0062] After the uniform mixing of the molten plastic and the colorant is completed, the injection mechanism 8 and the translation member 14 are activated. The injection mechanism 8 drives the screw 11 to slide in the barrel 2 towards the mold 10, causing the piston valve 17 to move synchronously with the screw 11. At the same time, the translation member 14 drives the intercepting ring 18 to press tightly against the overflow ring 172, thereby closing the piston valve 17. The molten plastic located on the side of the piston valve 17 close to the mold 10 is then extruded into the mold 10 under a certain pressure. After the molten plastic in the mold 10 cools and solidifies, the plastic product in the mold 10 is unloaded.

[0063] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An injection molding device for automobile plastic products, comprising a machine table (1), a mold (10) and a barrel (2) sequentially arranged on the machine table (1), a feeding mechanism (4) is arranged on the barrel (2), a glue-passing mechanism (5) is further arranged on the barrel (2), a screw rod (11) is movably arranged in the barrel (2), a driving mechanism (7) for driving the screw rod (11) to rotate is arranged on the machine table (1), and an injection mechanism (8) for driving the screw rod (11) to slide in the barrel (2) is further arranged on the machine table (1), and is characterized in that: One end of the barrel (2) close to the mold (10) is set as a detection section (9). A detection mechanism (6) for detecting the mixing degree of the colorant is arranged on the barrel (2) at the detection section (9). A stirring mechanism (3) for stirring the molten plastic at the detection section (9) is arranged on the screw rod (11). The housing of the detection section (9) is transparent. The detection mechanism (6) includes a receiving panel (61) coated on the outer shell of the detection section (9), a light emitter (62) located inside the detection section (9), and a processor (63) located on the machine table (1). The light emitted by the light emitter (62) is received by the receiving panel (61). Both the receiving panel (61) and the stirring mechanism (3) are electrically connected to the processor (63). A plurality of groups of the light emitters (62) are provided. The plurality of groups of the light emitters (62) are circumferentially spaced along the central axis of the screw rod (11). One end of the screw rod (11) close to the mold (10) is provided with a cone (12). The cone (12) is arranged coaxially with the screw rod (11). The plurality of groups of the light emitters (62) are all located on the cone (12). Each group of the light emitters (62) is provided with a plurality of them. The plurality of the light emitters (62) in the same group are spaced along the generatrix direction of the cone (12). The screw rod (11) is hollow. The stirring mechanism (3) includes a rotating rod (31) that rotates coaxially and penetrates through the screw rod (11), a rotating member (32) for driving the rotating rod (31) to rotate, and stirring bars located on the peripheral wall of the cone (12). The cone (12) is fixedly connected to one end of the rotating rod (31) far from the screw rod (11). The stirring bars protrude from the surface of the cone (12). The stirring bars are set as transparent cover shells (33). Embedding grooves (13) are formed on the cone (12). The plurality of the light emitters (62) in the same group are all located in the embedding grooves (13). The transparent cover shells (33) cover the openings of the embedding grooves (13). One end of the barrel (2) close to the mold (10) is set as a flared shape adapted to the cone (12). A translation member (14) for driving the cone (12) to reciprocally slide along the length direction of the barrel (2) inside the barrel (2) is arranged on the machine table (1). The transparent cover shells (33) are movably arranged on the cone (12) along the depth direction of the embedding grooves (13). An anti-collision structure (15) is arranged at one end of the transparent cover shells (33) close to the mold (10). A piston valve (17) is slidably arranged in the barrel (2). When the stirring mechanism (3) stirs the molten plastic at the detection section (9), the piston valve (17) is sealed; when the injection mechanism (8) drives the screw (11) to slide in the barrel (2) towards the direction close to the mold (10), the cone (12) synchronously slides following the screw (11) under the drive of the translation member (14), and the piston valve (17) is sealed; when the translation member (14) drives the cone (12) to slide away from the mold (10), the piston valve (17) is opened.

2. The injection molding device for an automotive plastic product according to claim 1, characterized in that: A scraping member (16) for scraping the side wall of the transparent cover (33) is arranged on the cone (12) at the embedding groove (13).

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