New energy vehicle front fender injection molding equipment and injection molding method

Abstract

The application discloses a new energy vehicle front fender injection molding equipment and an injection molding method, and relates to the technical field of injection molding. The equipment comprises a base, an injection auger, a feeding tank, an injection head and a blocking net assembly arranged between the injection end of the injection auger and the injection head. The blocking net assembly comprises a first docking seat, a second docking seat, a through groove surrounded by two temperature control seats, an intercepting seat inserted from the through groove and a telescopic rod for driving the intercepting seat. Two accommodating grooves are arranged on the intercepting seat along the moving direction at intervals. A blocking net is inserted into each accommodating groove. The telescopic rod is configured to make the injection auger run at a higher normal rotating speed for a preset pulse length before driving the intercepting seat to switch positions, so as to compact impurities on the surface of the blocking net, and then the switching is performed. The method determines the blocking net blockage based on the injection pressure or the injection length, triggers the above-mentioned acceleration compaction and switching actions, and realizes online switching of the blocking net. The application is suitable for high-cleanliness injection molding production of appearance parts such as new energy vehicle front fenders.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, specifically to injection molding equipment and methods for front fenders of new energy vehicles. Background Technology

[0002] Currently, the front fenders of new energy vehicles are usually manufactured using injection molding. During the injection molding process, molten plastic raw materials are pushed by the injection auger and injected into the mold cavity through the injection head. Since impurity particles may be mixed in the raw materials, or carbonized debris may be generated during the transportation process, it is necessary to set up a screen in the injection flow channel to filter the melt.

[0003] Existing filter structures are typically fixed single-layer filters. When the filter becomes clogged due to the accumulation of impurities, it needs to be shut down for disassembly and replacement. The downtime directly affects the efficiency of the production line, especially in the continuous production of large, thin-walled parts such as front fenders. Downtime can also lead to defects such as mold temperature drop and cold weld lines in the next mold.

[0004] In addition, during the replacement of the screen, loose clumps of impurities accumulated on the upstream side of the screen are easily detached when the screen is removed. The debris enters the downstream flow channel and enters the mold cavity with the next injection, causing black spot defects in the product.

[0005] Therefore, it is necessary to provide injection molding equipment and injection molding methods for the front fenders of new energy vehicles to solve the above problems. Summary of the Invention

[0006] To address the above problems, the present invention provides the following technical solution: Firstly, it provides injection molding equipment for front fenders of new energy vehicles, comprising: A base on which a mold is mounted; An injection auger has a receiving end and an injection end. The receiving end is connected to a feed tank, and the injection end is connected to an injection head. The injection head is used to inject molten plastic into the mold. A screen assembly is provided between the injection end and the injection head, and the screen assembly is configured to intercept impurities in the molten plastic.

[0007] Furthermore, preferably, the barrier assembly includes: The first docking seat is connected to the injection end; The second docking seat is connected to the injection head; Two temperature control seats are symmetrically arranged and respectively connected to the first docking seat and the second docking seat. The first docking seat, the second docking seat and the two temperature control seats together form a through groove. An interceptor seat is inserted into the through groove from the opening of the through groove; A telescopic rod is used to drive the interceptor seat to move.

[0008] Furthermore, as a preferred embodiment, the interceptor seat has two receiving slots, the opening of the receiving slots being perpendicular to the opening of the through slot, each receiving slot having a flow channel corresponding to the first docking seat on the side near the first docking seat and a flow channel corresponding to the second docking seat on the side near the second docking seat, and a barrier net being inserted into the receiving slot.

[0009] Furthermore, preferably, the two receiving slots are arranged at intervals along the moving direction of the interceptor seat, and the telescopic rod is configured to drive the interceptor seat to switch between a first station and a second station. At the first station, the net in one of the receiving slots is aligned with the flow channels of the first docking seat and the second docking seat, and at the second station, the net in the other receiving slot is aligned with the flow channels of the first docking seat and the second docking seat.

[0010] Furthermore, as a preferred embodiment, the barrier net includes a first barrier net, a support base, and a second barrier net connected in sequence. The support base has a connecting hole, which corresponds to the first barrier net and the second barrier net respectively. The thickness of the support base is up to a multiple of the thickness of the first barrier net or the second barrier net.

[0011] Furthermore, as a preferred embodiment, a gasket is provided circumferentially on the inner wall of the through groove, and a plurality of positioning through holes are provided on the gasket. A positioning groove corresponding to the positioning through holes is provided on the inner wall of the through groove. A receiving hole is provided on the surface of the interceptor seat opposite to the positioning through holes, and a positioning ball is connected to the receiving hole by a spring.

[0012] Furthermore, preferably, the diameter of the positioning ball is larger than the diameter of the positioning through hole and smaller than the diameter of the positioning groove.

[0013] Furthermore, as a preferred embodiment, the telescopic rod is configured such that, before driving the interceptor seat to switch from the current station to the target station, the injection auger first runs at a speed higher than the normal injection speed for a preset pulse duration, so as to compact the impurities on the upstream side of the current station's barrier net onto the surface of the barrier net, and then drives the interceptor seat to perform the switching.

[0014] Secondly, a method for injection molding the front fender of a new energy vehicle is provided, including the following steps: The mold is closed, and the injection auger transports the injection plastic body from the feed tank to the injection head through the net assembly, and injects it into the cavity of the mold. After injection, the pressure holding stage is entered. During continuous injection molding, when the injection pressure exceeds a preset pressure threshold or the injection time exceeds a preset time threshold, it is determined that the current station's barrier is blocked, and the telescopic rod drives the interceptor seat to switch from the current station to the target station. After the switching is completed, the telescopic rod drives the interceptor seat to align the barrier in the receiving slot of the target station with the flow channel, and the injection molding is restored.

[0015] Compared with the prior art, the present invention provides injection molding equipment and injection molding method for front fenders of new energy vehicles, which has the following beneficial effects: In this invention, the interceptor seat is provided with two receiving slots, and a barrier net is inserted into each receiving slot. The telescopic rod can switch between the two workstations to realize online replacement of the barrier net. When one barrier net is working, the other barrier net is in standby state, and the switching process does not interrupt the injection molding production.

[0016] In this invention, before switching the screen, the injection auger runs at a speed higher than the normal injection speed for a preset pulse duration to compact the loose impurity clumps on the upstream side of the screen and embed them into the screen surface. During the switching, the impurities exit the channel with the old screen, reducing the amount of impurities falling off and entering the downstream flow channel.

[0017] In this invention, the barrier adopts a three-layer structure consisting of a first barrier, a support base, and a second barrier connected in sequence. The support base provides structural rigidity, and the two barrier layers can undertake different filtration tasks respectively. Furthermore, the thickness of the support base is 5 to 10 times the thickness of the barrier, which improves the overall compressive strength while ensuring the filtration area. Attached Figure Description

[0018] Figure 1 A schematic diagram of the injection molding equipment for the front fender of a new energy vehicle. Figure 2 This is a schematic diagram of the structure of the barrier assembly; Figure 3 This is a schematic diagram of the structure of the first docking seat; Figure 4 This is a schematic diagram of the barrier net structure; In the diagram: 1. Base; 2. Injection auger; 3. Feed tank; 4. Barrier assembly; 5. Injection head; 6. Mold; 41. First docking seat; 42. Second docking seat; 43. Temperature control seat; 44. Interception seat; 45. Telescopic rod; 46. Barrier; 441. Receiving groove; 442. Positioning ball; 411. Positioning groove; 412. Gasket; 413. Positioning through hole; 461. First barrier; 462. Second barrier; 463. Support seat; 464. Connecting hole. Detailed Implementation

[0019] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0020] Example: Refer to Figures 1 to 4 This embodiment provides an injection molding equipment for the front fender of a new energy vehicle, including a base 1, an injection auger 2, a feeding tank 3, a netting assembly 4, an injection head 5, and a mold 6.

[0021] The base 1 serves as the support foundation for the equipment, on which a mold 6 is fixedly installed. The mold 6 has a cavity that corresponds to the shape of the front fender of the new energy vehicle.

[0022] The injection auger 2 is mounted on the base 1 and has a receiving end and an injection end. When the injection auger 2 rotates, it pushes molten plastic from the receiving end to the injection end. The receiving end is connected to a feed tank 3 through a pipeline. The feed tank 3 is used to store and supply injection molding raw materials. The injection end is connected to an injection head 5 through a mesh assembly 4. The front end of the injection head 5 is connected to the gate of the mold 6 and is used to inject molten plastic into the cavity of the mold 6.

[0023] Reference Figure 2 The barrier assembly 4 includes a first docking seat 41, a second docking seat 42, two temperature control seats 43, an interception seat 44, and a telescopic rod 45.

[0024] The first docking seat 41 is connected at one end to the injection end of the injection auger 2, and at the other end to the through groove. The second docking seat 42 is connected at one end to the injection head 5, and at the other end to the through groove.

[0025] Two temperature control seats 43 are symmetrically arranged between the first docking seat 41 and the second docking seat 42. Specifically, the two temperature control seats 43 are located at the front end and rear end of the through groove, respectively. Figure 2 (Taking the orientation shown as an example), the left end of each temperature control seat 43 is fixedly connected to the first docking seat 41, and the right end is fixedly connected to the second docking seat 42. Thus, the first docking seat 41, the second docking seat 42, and the two temperature control seats 43 together form a through groove with a rectangular cross-section. A heating element (not shown in the figure) is provided inside the temperature control seat 43 for temperature control of the molten plastic in the through groove.

[0026] The interceptor seat 44 is a long strip-shaped block that is inserted into the through groove from the opening of the through groove and can move back and forth along the through groove. The telescopic rod 45 is installed on the base 1 or on the first docking seat 41 or the second docking seat 42, and its telescopic end is fixedly connected to the interceptor seat 44 to drive the interceptor seat 44 to move along the through groove.

[0027] Reference Figure 2 and Figure 3 The interceptor seat 44 has two receiving grooves 441. Each receiving groove 441 is a rectangular recess located on the surface of the interceptor seat 44 facing the temperature control seat 43. The opening of the receiving groove 441 is perpendicular to the opening of the through groove. Each receiving groove 441 has a flow channel corresponding to the first docking seat 41 on the side near the first docking seat 41 and a flow channel corresponding to the second docking seat 42 on the side near the second docking seat 42. Molten plastic flows into the receiving groove 441 from the first docking seat 41 and then flows out from the second docking seat 42. A baffle 46 is inserted into each receiving groove 441.

[0028] Two receiving slots 441 are arranged at intervals along the moving direction of the interceptor seat 44. A telescopic rod 45 drives the interceptor seat 44 to switch between a first station and a second station. At the first station, the barrier 46 in the lower receiving slot 441 is aligned with the flow channels of the first docking seat 41 and the second docking seat 42, and molten plastic flows through the barrier. At the second station, the barrier 46 in the upper receiving slot 441 is aligned with the flow channel, and molten plastic flows through the barrier.

[0029] Reference Figure 4 The barrier 46 has a three-layer structure, comprising a first barrier 461, a support base 463, and a second barrier 462 stacked sequentially. The first barrier 461 and the second barrier 462 are woven wire mesh or perforated plates used to filter impurities from the molten plastic. The support base 463 is a metal plate with multiple connecting holes 464, which correspond to the mesh areas of the first barrier 461 and the second barrier 462, ensuring smooth passage of the molten plastic. The thickness of the support base 463 is 5 to 10 times, preferably 6 to 8 times, the thickness of the first barrier 461 or the second barrier 462, to provide sufficient compressive strength.

[0030] Reference Figure 3 A gasket 412 is circumferentially provided on the inner wall of the through groove (i.e., the inner wall of the first docking seat 41 / the second docking seat 42). Multiple positioning through holes 413 are formed on the gasket 412. Positioning grooves 411 are formed on the inner wall of the through groove, corresponding to the positions of each positioning through hole 413. The positioning grooves 411 are recesses on the inner wall, and their positions correspond one-to-one with the positioning through holes 413.

[0031] The interceptor seat 44 has a receiving hole on its surface opposite to the gasket 412. A spring and a positioning ball 442 are installed in the receiving hole. The positioning ball 442 is pushed towards the gasket 412 under the elastic force of the spring. When the interceptor seat 44 is in the first or second position, the positioning ball 442 is engaged in the corresponding positioning through hole 413 to achieve position locking.

[0032] The diameter of the positioning ball 442 is larger than the diameter of the positioning through hole 413, but smaller than the diameter of the positioning groove 411. Because the diameter of the positioning ball 442 is larger than the diameter of the positioning through hole 413, the ball will not completely pass through when it is inserted into the through hole, but will only partially insert, creating a jam. When the telescopic rod 45 applies a sufficiently large driving force, the positioning ball 442 can overcome the spring force and disengage from the positioning through hole 413. The diameter of the positioning groove 411 is larger than the diameter of the positioning ball 442, providing the ball with a deeper insertion space.

[0033] When it is necessary to switch the barrier 46 (for example, the system determines that the barrier at the current station is blocked based on the injection pressure or injection duration), the telescopic rod 45 does not perform the switching action immediately, but instead sends an acceleration command to the drive system of the injection auger 2. The injection auger 2 runs at a speed higher than the normal injection speed for a preset pulse duration, for example, if the normal injection speed is 200 rpm, the pulse speed is increased to 300 rpm, lasting for 100 to 300 milliseconds.

[0034] During this pulse, the increased melt flow rate generates a higher pressure differential across the barrier 46. Loose impurity clumps accumulated on the upstream surface of the barrier 46 are compacted and embedded into the mesh of the barrier 46 under this high pressure differential. After the pulse ends, the telescopic rod 45 drives the interceptor seat 44 to switch from the station corresponding to the receiving groove 441 to the target station. Because the impurities have been compacted and embedded in the barrier, they will not fall off the barrier surface during the movement of the interceptor seat. When the old barrier is withdrawn from the through groove along with the receiving groove, the impurities are also withdrawn and will not remain in the through groove or enter the downstream second docking seat 42.

[0035] After the switchover is complete, the screen 46 in the receiving groove 441 of the target station aligns with the flow channel, the telescopic rod 45 stops driving, and normal injection pressure and speed are restored to continue injection molding production. The old screen that was replaced can be removed from the receiving groove 441 outside the channel and replaced with a new screen for later use.

[0036] This embodiment also provides a method for injection molding a front fender of a new energy vehicle, utilizing the aforementioned equipment and including the following steps: Step S1: Mold closing and injection molding. The mold 6 closes, the injection auger 2 rotates, and the molten plastic from the feed tank 3 is transported to the injection head 5 through the mesh assembly 4 and injected into the cavity of the mold 6. After injection, the pressure holding stage begins.

[0037] Step S2: Blockage Detection. During continuous injection molding, the injection pressure and injection time are monitored in real time. When the injection pressure exceeds a preset pressure threshold (e.g., exceeding 120% of the normal injection pressure) or the injection time exceeds a preset time threshold (e.g., exceeding 115% of the normal injection time), the current station's barrier 46 is determined to be blocked. If the threshold is not exceeded, the next injection cycle continues.

[0038] Step S3: Accelerate compaction. After determining that the barrier is blocked, before the drive interceptor 44 switches, the telescopic rod 45 first makes the injection auger 2 run at a speed higher than the normal injection speed for a preset pulse duration (preferably 100 to 300 milliseconds) to compact the impurities on the upstream side of the current station's barrier 46 onto the surface of the barrier 46.

[0039] Step S4: Station Switching. After the preset pulse duration ends, the telescopic rod 45 drives the interceptor seat 44 to switch from the current station to the target station. The interceptor seat 44 moves along the through groove axis until the barrier 46 in the receiving groove 441 of the target station is aligned with the flow channels of the first docking seat 41 and the second docking seat 42.

[0040] Step S5: Resume Injection Molding. After the switchover is complete, the injection auger 2 returns to its normal injection speed, the telescopic rod 45 stops driving, ensuring that the screen 46 in the receiving groove 441 of the target station is aligned with the flow channel, and injection molding production resumes. During this period, the operator can remove the old screen, which has been switched to the outside of the channel, from the receiving groove 441 and replace it with a new screen.

[0041] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An injection molding equipment for front fenders of new energy vehicles, characterized in that, include: Base (1), on which a mold (6) is provided; The injection auger (2) has a receiving end and an injection end. The receiving end is connected to a feeding tank (3), and the injection end is connected to an injection head (5). The injection head (5) is used to inject molten plastic into the mold (6). A screen assembly (4) is provided between the injection end and the injection head (5), and the screen assembly (4) is configured to intercept impurities in the molten plastic.

2. The injection molding equipment for front fenders of new energy vehicles according to claim 1, characterized in that, The barrier assembly (4) includes: The first docking seat (41) is connected to the injection end; The second docking seat (42) is connected to the injection head (5); Two temperature control seats (43) are symmetrically arranged and respectively connected to the first docking seat (41) and the second docking seat (42). The first docking seat (41), the second docking seat (42) and the two temperature control seats (43) together form a through groove. The interceptor seat (44) is inserted into the through groove from the opening of the through groove; Telescopic rod (45) is used to drive the interceptor seat (44) to move.

3. The injection molding equipment for front fenders of new energy vehicles according to claim 2, characterized in that, The interceptor seat (44) has two receiving slots (441). The opening of the receiving slot (441) is perpendicular to the opening of the through slot. Each receiving slot (441) has a flow channel corresponding to the first docking seat (41) on the side near the first docking seat (41) and a flow channel corresponding to the second docking seat (42) on the side near the second docking seat (42). A net (46) is inserted in the receiving slot (441).

4. The injection molding equipment for front fenders of new energy vehicles according to claim 3, characterized in that, Two receiving slots (441) are arranged at intervals along the moving direction of the interceptor seat (44), and the telescopic rod (45) is configured to drive the interceptor seat (44) to switch between a first station and a second station. At the first station, the net (46) in one of the receiving slots (441) is aligned with the flow channels of the first docking seat (41) and the second docking seat (42). At the second station, the net (46) in the other receiving slot (441) is aligned with the flow channels of the first docking seat (41) and the second docking seat (42).

5. The injection molding equipment for front fenders of new energy vehicles according to claim 3, characterized in that, The barrier net (46) includes a first barrier net (461), a support base (463), and a second barrier net (462) connected in sequence. The support base (463) has a connecting hole (464) which corresponds to the first barrier net (461) and the second barrier net (462) respectively. The thickness of the support base (463) is (5) to (10) times the thickness of the first barrier net (461) or the second barrier net (462).

6. The injection molding equipment for front fenders of new energy vehicles according to claim 2, characterized in that, The inner wall of the through groove is provided with a gasket (412) circumferentially, and the gasket (412) is provided with a plurality of positioning through holes (413). The inner wall of the through groove is provided with a positioning groove (411) corresponding to the positioning through hole (413). The surface of the interceptor seat (44) opposite to the positioning through hole (413) is provided with a receiving hole, and a positioning ball (442) is connected to the receiving hole by a spring.

7. The injection molding equipment for front fenders of new energy vehicles according to claim 6, characterized in that, The diameter of the positioning ball (442) is larger than the diameter of the positioning through hole (413) and smaller than the diameter of the positioning groove (411).

8. The injection molding equipment for front fenders of new energy vehicles according to claim 5, characterized in that, The telescopic rod (45) is configured to, before driving the interceptor seat (44) to switch from the current station to the target station, first make the injection auger (2) run at a speed higher than the normal injection speed for a preset pulse duration, so as to compact the impurities on the upstream side of the current station's barrier (46) onto the surface of the barrier (46), and then drive the interceptor seat (44) to perform the switch.

9. A method for injection molding front fenders of new energy vehicles, using the injection molding equipment for front fenders of new energy vehicles as described in any one of claims 3 to 8, characterized in that, Includes the following steps: The mold (6) is closed, and the injection auger (2) transports the injection plastic body from the feed tank (3) to the injection head (5) through the net assembly (4) and injects it into the cavity of the mold (6). After the injection is completed, the pressure holding stage is entered. During continuous injection molding, when the injection pressure exceeds the preset pressure threshold or the injection time exceeds the preset time threshold, it is determined that the current station's barrier (46) is blocked, and the telescopic rod (45) drives the interceptor (44) to switch from the current station to the target station. After the switching is completed, the telescopic rod (45) drives the interceptor seat (44) to align the net (46) in the receiving groove (441) of the target station with the flow channel, and resume injection molding.

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