A kind of excess material recovery device for automobile injection molding

Abstract

The application relates to the technical field of plastic recycling, in particular to a surplus material recycling device for automobile injection molding, which comprises a first rack and a second rack, a melting mechanism is arranged on the first rack, and an extrusion mechanism is arranged on the second rack. The melting mechanism comprises a melting cylinder and a first screw rod, the melting and conveying of materials are realized through a heater and a first driving assembly; the extrusion mechanism comprises an extrusion cylinder and a second screw rod, the molten material is extruded to a filtering assembly, impurities are filtered through a filter screen plate which can move up and down, and finally, the extruded material is cooled and shaped by a cooling water tank. The device has the beneficial effects of sufficient melting, efficient filtering and convenient operation and maintenance, and is suitable for efficient recycling of automobile injection molding surplus materials.

Description

Technical Field

[0001] This application relates to the field of plastic recycling technology, and in particular to a device for recycling waste material from the injection molding of automotive injection molded parts. Background Technology

[0002] In the automotive manufacturing industry, injection molding is the core process for producing injection molded automotive parts, widely used in the processing of various components such as bumpers, dashboards, and door panels. However, the injection molding process inevitably generates a large amount of waste material, mainly including gate waste from the injection mold, runner waste, and scrap parts resulting from dimensional deviations, appearance defects, and other issues. This waste material accounts for approximately 10%-25% of the total raw materials used in injection molding. Directly discarding this waste material not only causes serious resource waste and increases production costs for enterprises, but also leads to environmental pollution problems due to the difficulty in the natural degradation of plastic waste.

[0003] To address the aforementioned issues, various plastic waste recycling devices have emerged in the existing technology. However, these devices still have several shortcomings in practical applications: Firstly, most devices use a single screw structure to complete melting and extrusion, resulting in uneven residence time of the material in the melting cylinder. Some waste materials are not fully melted, while some melted materials degrade due to overheating, affecting the mechanical properties of the recycled material. Secondly, the impurity filtration effect is poor. Automotive injection molded parts waste materials often contain impurities such as mold debris, oil stains, and dust. During the discharge process, the filter screen is easily clogged, requiring machine shutdown for disassembly and replacement, which seriously affects the continuity of production. Utility Model Content

[0004] This utility model addresses the aforementioned problems in the existing technology by providing a waste material recycling device for automotive injection molded parts.

[0005] The objective of this utility model is mainly achieved through the following solution:

[0006] A waste material recycling device for injection molding of automotive injection molded parts includes a first frame and a second frame. A melting mechanism is installed on the first frame, and an extrusion mechanism is installed on the second frame. The discharge end of the extrusion mechanism is provided with a cooling water tank.

[0007] The melting mechanism includes a first driving assembly and a first conveying assembly. The first conveying assembly includes a melting cylinder mounted on the first frame and a first screw housed within the melting cylinder. The melting cylinder has a first hopper at its inlet and a heater on its cylinder wall. The first driving assembly is connected to the first screw and is used to drive it to rotate in order to convey and melt the material.

[0008] The extrusion mechanism includes a second drive assembly and a second conveying assembly. The second conveying assembly includes an extrusion cylinder mounted on the second frame and a second screw housed within the extrusion cylinder. The feed end of the extrusion cylinder is connected to the discharge end of the molten cylinder via a second hopper. The second drive assembly is connected to the second screw and is used to drive it to rotate in order to extrude the molten material forward.

[0009] The discharge end of the extrusion cylinder is equipped with a filter assembly, and the cooling water tank is located below the filter assembly for cooling and shaping the extruded strip material.

[0010] Preferably, both the first screw and the second screw are tapered screws, with the pitch at the feed end being greater than the pitch at the discharge end.

[0011] Preferably, protective covers are provided on both the outer side of the melting cylinder on the first frame and the outer side of the extrusion cylinder on the second frame.

[0012] Preferably, the first hopper has a funnel-shaped structure, and a slot is provided at the bottom of the first hopper. A limiting baffle slides in the slot, and the discharge of excess material of the injection molded part is controlled by adjusting the position of the limiting baffle.

[0013] Preferably, an inspection port is provided on one side of the lower part of the first hopper, and an observation port is provided on the side wall of the melting cylinder near the discharge end.

[0014] Preferably, the heater is an electric heating coil surrounding the outer wall of the melting cylinder, and multiple coils are provided along the length of the melting cylinder.

[0015] Preferably, the discharge end of the melting cylinder is connected to a die head assembly, which includes a first die head and a second die head. The middle of the first die head and the second die head is provided with a first discharge hole that communicates with the inside of the melting cylinder. The diameter of the first discharge hole is smaller than the inner diameter of the melting cylinder, and the outlet of the first discharge hole extends into the inside of the second hopper.

[0016] Preferably, the filter assembly includes a first discharge plate, a second discharge plate, a filter screen, and a telescopic assembly; the first discharge plate is connected to the discharge end of the extrusion cylinder, and a second discharge hole communicating with the interior of the extrusion cylinder is provided through the first discharge plate, the diameter of the second discharge hole being smaller than the internal diameter of the extrusion cylinder.

[0017] Preferably, the first discharge plate is installed on one side of the second discharge plate, and the second discharge plate has a third discharge hole corresponding to the second discharge hole on the side facing the first discharge plate. The side of the second discharge plate away from the first discharge plate has an installation groove, in which a discharge block is detachably installed. A discharge channel is provided through the discharge block. The second discharge plate also has a vertically penetrating groove located between the installation groove and the third discharge hole. The filter screen is slidably connected in the groove. The telescopic component is installed on the upper surface of the second discharge plate, and the telescopic component is connected to the top of the filter screen and can drive it to move up and down.

[0018] Preferably, the filter screen plate is provided with multiple rows of filter holes vertically corresponding to the discharge channel.

[0019] In summary, compared with the prior art, the present invention has the following beneficial technical effects:

[0020] (1) The melting mechanism of this utility model adopts a segmented electric heating coil and a first screw with a gradually changing pitch. The electric heating coil, together with the first screw, stirs and squeezes the residual material, so that the residual material is heated evenly and melted fully. This effectively avoids the problem of incomplete melting or excessive degradation of materials in traditional devices and improves the quality of recycled materials.

[0021] (2) The limiting baffle in the first hopper of this utility model can control the amount of material fed, and avoid excessive feeding leading to blockage of the melting cylinder; at the same time, the design of the inspection port of the first hopper and the observation port of the melting cylinder makes it convenient for staff to deal with equipment failures and monitor the material status in a timely manner, reducing the difficulty of operation and maintenance.

[0022] (3) The movable filter screen and multi-row filter hole design in the extrusion mechanism of this utility model can not only effectively intercept impurities in the molten material and improve the purity of the recycled material, but also achieve non-stop cleaning and switching by moving the filter screen through the telescopic component.

[0023] (4) This utility model realizes the efficient recycling and reuse of automotive injection molded parts waste, reduces the emission of plastic waste and reduces resource waste; at the same time, the recycled material can be directly used for secondary injection molding production, which significantly reduces the raw material procurement cost of enterprises and improves the economic benefits of enterprises. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is the front view of this utility model;

[0026] Figure 3 This is an exploded schematic diagram of the melting mechanism in this utility model;

[0027] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0028] Figure 5 This is a schematic diagram of the extrusion mechanism in this utility model;

[0029] Figure 6 This is an exploded view of the extrusion mechanism in this utility model;

[0030] Figure 7 This is an exploded view of the filter assembly in this utility model;

[0031] Figure 8 This is a cross-sectional view of the filter component in this utility model.

[0032] Reference numerals: 1-First frame; 2-Second frame; 3-Melting mechanism; 4-Extrusion mechanism; 5-Cooling water tank; 6-First drive assembly; 7-Melting cylinder; 8-First screw; 9-First hopper; 10-Heater; 11-Second drive assembly; 12-Extrusion cylinder; 13-Second screw; 14-Protective cover; 15-Slot; 16-Limit baffle; 17-Inspection port; 18-Observation port; 19-First die head; 20-Second die head; 21-First discharge hole; 22-First discharge plate; 23-Second discharge plate; 24-Filter screen plate; 25-Telescopic assembly; 26-Second discharge hole; 27-Third discharge hole; 28-Mounting groove; 29-Discharge block; 30-Discharge channel; 31-Groove; 32-Filter hole. Detailed Implementation

[0033] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0034] like Figure 1 , 2 As shown, this utility model discloses a technical solution: a waste material recycling device for injection molding of automotive injection molded parts, including a first frame 1 and a second frame 2. The first frame 1 is equipped with a melting mechanism 3 for melting solid waste material into a fluid, and the second frame 2 is equipped with an extrusion mechanism 4 for extruding the molten material into a mold. The discharge end of the extrusion mechanism 4 is provided with a cooling water tank 5 for cooling and shaping the molded material.

[0035] like Figure 3As shown, the melting mechanism 3 includes a first drive assembly 6 and a first conveying assembly. The first conveying assembly includes a melting cylinder 7 fixedly mounted on the first frame 1 by bolts and brackets, and a first screw 8 coaxially housed within the melting cylinder 7 via bearings. The inlet of the melting cylinder 7 is welded and fixed or bolted to a first hopper 9 for discharging residual material. Multiple heaters 10 are evenly installed along the length of the cylinder wall of the melting cylinder 7 to provide a heat source for melting the residual material. The first drive assembly 6 adopts a combination structure of a servo motor and a gearbox. Its output end is rigidly connected to one end of the first screw 8 via a coupling to drive the first screw 8 to rotate at a stable speed, thereby realizing the conveying and stirring melting of the residual material.

[0036] like Figure 5 , 6 As shown, the extrusion mechanism 4 includes a second drive assembly 11 and a second conveying assembly. The second conveying assembly includes an extrusion cylinder 12 fixedly mounted on the second frame 2 by bolts and brackets, and a second screw 13 coaxially housed within the extrusion cylinder 12 via bearings. The feed end of the extrusion cylinder 12 is fixedly connected to a second hopper by welding or bolts. The feed port of the second hopper is connected to the discharge end of the melting cylinder 7 to achieve stable conveying of molten material. The second drive assembly 11 also adopts a combination structure of servo motor and gearbox. Its output end is connected to the second screw 13 via a coupling to drive the second screw 13 to rotate and extrude the molten material forward at a constant pressure.

[0037] The discharge end of the extrusion cylinder 12 is fixed with a filter assembly for filtering impurities in the molten material by bolts. The cooling water tank 5 is placed directly below the filter assembly and is filled with cooling water to quickly cool and shape the strip material extruded from the filter assembly. The cooled strip material can be directly fed into the subsequent pelletizing process.

[0038] Specifically, both the first screw 8 and the second screw 13 adopt a gradually changing pitch screw, with the pitch at the feed end being greater than that at the discharge end. This structural design causes the volume of the screw groove to gradually decrease during material conveying, thereby creating a gradually increasing extrusion pressure on the material. On the one hand, this promotes the compaction of solid residue in the melting cylinder 7, improving melting efficiency; on the other hand, it ensures that the molten material forms a stable pressure in the extrusion cylinder 12, guaranteeing uniform discharge.

[0039] Specifically, protective covers 14 made of cold-rolled steel plates are installed on the outer side of the melting cylinder 7 on the first frame 1 and on the outer side of the extrusion cylinder 12 on the second frame 2. The protective covers 14 are equipped with heat dissipation holes and detachable observation windows. The protective covers 14 can not only effectively prevent workers from accidentally coming into contact with high-temperature components and causing burns, but also reduce the pollution of the equipment's interior by dust in the environment, while allowing workers to easily check the equipment's operating status in real time through the observation windows.

[0040] Specifically, the first hopper 9 has a funnel-shaped structure, and its inner wall is polished to reduce the adhesion of residual material, such as... Figure 4 As shown, a slot 15 is provided at the lower part of the first hopper 9 along the horizontal direction. A limiting baffle 16 is slidably connected in the slot 15. One end of the limiting baffle 16 extends to the outside of the first hopper 9 and is provided with a pull plate. The operator can adjust the position of the limiting baffle 16 in the slot 15 by pushing the pull plate, thereby changing the opening of the discharge port of the first hopper 9, realizing the control of the amount of residual material discharged from the injection molded part, and avoiding excessive or insufficient feeding.

[0041] Specifically, an inspection port 17 is provided on one side of the lower part of the first hopper 9. A cover plate can be connected to the inspection port 17 via a hinge. When residual material blocks the inside of the first hopper 9, the cover plate can be opened to clear the blockage through the inspection port 17. A high-temperature resistant glass observation port 18 is embedded on the side wall of the melting cylinder 7 near the discharge end. The staff can directly observe the melting state of the material in the melting cylinder 7 through the observation port 18, which facilitates timely adjustment of the heating power of the heater 10 and the rotation speed of the first screw 8.

[0042] Specifically, heater 10 is an electric heating coil surrounding the outer wall of the melting cylinder 7. The electric heating coil is tightly fitted to the outer wall of the melting cylinder 7, and 3-5 independently controlled electric heating coils are arranged along the length of the melting cylinder 7. Each electric heating coil is equipped with a temperature sensor, which can monitor the temperature of the corresponding section of the melting cylinder 7 in real time. Through the control system, segmented heating and precise temperature control are realized to ensure that a temperature gradient gradually increases from the feed end to the discharge end is formed in the melting cylinder 7, which meets the temperature requirements of the residue from solid to molten fluid and avoids local overheating and degradation of the material. The electric heating coil can be a JRQ-2KW cast aluminum electric heating coil, which has a thermal efficiency of over 95% and is suitable for the heating requirements of the melting cylinder. Each electric heating coil is equipped with a PT100 platinum resistance temperature sensor, which has high measurement accuracy and good stability, and can monitor the temperature of the corresponding section of the melting cylinder 7 in real time and output an analog signal. The controller of this device is a PLC-S7-1200 programmable logic controller, which has multiple analog input / output interfaces and digital control interfaces, enabling centralized control of various components. The controller, electric heating coil, temperature sensor, telescopic assembly 25, first drive assembly 6, and second drive assembly 11 are electrically connected via wires. The signal output terminal of the temperature sensor is connected to the analog input terminal of the controller, the analog output terminal of the controller is connected to the control terminal of the electric heating coil, and the digital output terminal of the controller is connected to the solenoid valve / drive module of the telescopic assembly and the servo driver of each drive assembly. The controller receives the temperature sensor signal and outputs control commands to achieve heating temperature adjustment, telescopic assembly movement, and drive assembly speed control. Specific circuit connections and signal control are not covered in this application and will not be elaborated further. The control system achieves segmented heating and precise temperature control, ensuring a gradually increasing temperature gradient from the feed end to the discharge end within the melting cylinder 7, meeting the temperature requirements of the residual material from solid to molten fluid, and preventing localized overheating and degradation of the material.

[0043] Specifically, the discharge end of the melting cylinder 7 is bolted to a die assembly, which includes a first die 19 and a second die 20 that fit together. The first die 19 is fixedly connected to the discharge end of the melting cylinder 7, and the second die 20 is fastened to the first die 19 by bolts. A first discharge hole 21, communicating with the interior of the melting cylinder 7, is coaxially provided in the middle of the first die 19 and the second die 20. The diameter of the first discharge hole 21 is smaller than the internal diameter of the melting cylinder 7, and the outlet end of the first discharge hole 21 extends into the interior of the second hopper by 10-15 mm. This die assembly can initially limit the flow of molten material output from the melting cylinder 7, improve the pressure stability of the material entering the extrusion cylinder 12, and prevent leakage of molten material during transportation.

[0044] Specifically, such as Figure 7 , 8As shown, the filter assembly includes a first discharge plate 22, a second discharge plate 23, a filter screen 24, and a telescopic assembly 25. The first discharge plate 22 is sealed to the discharge end of the extrusion cylinder 12 by bolts, and a second discharge hole 26 communicating with the inside of the extrusion cylinder 12 is provided through the middle of the first discharge plate 22. The diameter of the second discharge hole 26 is smaller than the internal diameter of the extrusion cylinder 12, and it is used to perform preliminary diversion of the molten material.

[0045] Specifically, the first discharge plate 22 is bolted to one side of the second discharge plate 23, and the second discharge plate 23 has a third discharge hole 27 corresponding to the second discharge hole 26 on the side facing the first discharge plate 22, ensuring that the molten material can flow smoothly from the first discharge plate 22 into the second discharge plate 23; a rectangular mounting groove 28 is provided on the side of the second discharge plate 23 away from the first discharge plate 22, and a discharge block 29 is detachably installed in the mounting groove 28 by bolts. A discharge channel 30 is provided through the discharge block 29 along its length. The cross-section of the discharge channel 30 is circular or square, and different specifications can be replaced as needed. The material channel 30 has a discharge block 29; the second discharge plate 23 is also vertically provided with a sliding groove 31 located between the mounting groove 28 and the third discharge hole 27. The filter screen plate 24 is slidably connected in the sliding groove 31. The thickness of the filter screen plate 24 is adapted to the width of the sliding groove 31 to ensure the sealing performance between the two. The telescopic component 25 adopts a cylinder or electric push rod, which is fixedly installed on the upper surface of the second discharge plate 23 by a bracket. The telescopic end of the telescopic component 25 is rigidly connected to the top of the filter screen plate 24 through a connecting block, which can drive the filter screen plate 24 to move up and down along the sliding groove 31 to realize the rapid switching and cleaning of the filter screen plate 24.

[0046] Specifically, the filter screen plate 24 is vertically provided with multiple rows of filter holes 32 that correspond one-to-one with the discharge channel 30. When the filter screen plate 24 is in working condition, the molten material is squeezed out sequentially through the third discharge hole 27, the filter holes 32, and the discharge channel 30, and impurities are intercepted on the side of the filter screen plate 24 facing the third discharge hole 27. When the filter screen plate 24 is clogged, the telescopic component 25 drives the filter screen plate 24 to move, so that the filter holes 32 in the unclogged area are aligned with the discharge channel 30, realizing cleaning without stopping the machine and improving production continuity.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waste material recycling device for injection molding of automotive injection molded parts, comprising a first frame (1) and a second frame (2), characterized in that: A melting mechanism (3) is installed on the first frame (1), and an extrusion mechanism (4) is installed on the second frame (2), and a cooling water tank (5) is provided at the discharge end of the extrusion mechanism (4). The melting mechanism (3) includes a first drive assembly (6) and a first conveying assembly. The first conveying assembly includes a melting cylinder (7) mounted on the first frame (1) and a first screw (8) housed in the melting cylinder (7). The inlet of the melting cylinder (7) is provided with a first hopper (9), and the cylinder wall of the melting cylinder (7) is provided with a heater (10). The first drive assembly (6) is connected to the first screw (8) and is used to drive it to rotate in order to convey and melt the material. The extrusion mechanism (4) includes a second drive assembly (11) and a second conveying assembly. The second conveying assembly includes an extrusion cylinder (12) mounted on the second frame (2) and a second screw (13) housed within the extrusion cylinder (12). The feed end of the extrusion cylinder (12) is connected to the discharge end of the melting cylinder (7) via a second hopper. The second drive assembly (11) is connected to the second screw (13) and is used to drive it to rotate in order to extrude the molten material forward. The discharge end of the extrusion cylinder (12) is provided with a filter assembly, and the cooling water tank (5) is located below the filter assembly for cooling and shaping the extruded strip material.

2. The waste material recycling device for injection molding of automotive injection molded parts according to claim 1, characterized in that: Both the first screw (8) and the second screw (13) are gradually pitched screws, and the pitch at the feed end is greater than the pitch at the discharge end.

3. The waste material recycling device for injection molding of automotive injection molded parts according to claim 1, characterized in that: The first frame (1) is covered with a protective cover (14) on the outside of the melting cylinder (7) and the second frame (2) is covered with a protective cover (14) on the outside of the extrusion cylinder (12).

4. The waste material recycling device for injection molding of automotive injection molded parts according to claim 1, characterized in that: The first hopper (9) has a funnel-shaped structure, and a slot (15) is provided at the lower part of the first hopper (9). A limiting baffle (16) slides in the slot (15), and the discharge of the remaining material of the injection molded part is controlled by adjusting the position of the limiting baffle (16).

5. A waste material recycling device for injection molding of automotive injection molded parts according to claim 4, characterized in that: The first hopper (9) has an inspection port (17) on one side of its lower part, and the melting cylinder (7) has an observation port (18) on one side wall near the discharge end.

6. The waste material recycling device for injection molding of automotive injection molded parts according to claim 1, characterized in that: The heater (10) is an electric heating coil surrounding the outer wall of the melting cylinder (7), and multiple heaters are provided along the length of the melting cylinder (7).

7. A waste material recycling device for injection molding of automotive injection molded parts according to claim 1, characterized in that: The discharge end of the melting cylinder (7) is connected to a die head assembly, which includes a first die head (19) and a second die head (20). The middle of the first die head (19) and the second die head (20) is provided with a first discharge hole (21) that communicates with the inside of the melting cylinder (7). The diameter of the first discharge hole (21) is smaller than the internal diameter of the melting cylinder (7), and the outlet of the first discharge hole (21) extends into the inside of the second hopper.

8. A waste material recycling device for injection molding of automotive injection molded parts according to claim 1, characterized in that: The filter assembly includes a first discharge plate (22), a second discharge plate (23), a filter screen (24), and a telescopic assembly (25); the first discharge plate (22) is connected to the discharge end of the extrusion cylinder (12), and a second discharge hole (26) communicating with the inside of the extrusion cylinder (12) is provided through the first discharge plate (22), the diameter of the second discharge hole (26) is smaller than the internal diameter of the extrusion cylinder (12).

9. A waste material recycling device for injection molding of automotive injection molded parts according to claim 8, characterized in that: The first discharge plate (22) is installed on one side of the second discharge plate (23), and the second discharge plate (23) facing the first discharge plate (22) has a third discharge hole (27) corresponding to the second discharge hole (26). The second discharge plate (23) away from the first discharge plate (22) has an installation groove (28). A discharge block (29) is detachably installed in the installation groove (28). A discharge channel (30) is provided through the discharge block (29). A sliding groove (31) is also provided vertically through the second discharge plate (23) between the installation groove (28) and the third discharge hole (27). The filter screen plate (24) is slidably connected in the sliding groove (31). The telescopic component (25) is installed on the upper surface of the second discharge plate (23), and the telescopic component (25) is connected to the top of the filter screen plate (24) and can drive it to move up and down.

10. A waste material recycling device for injection molding of automotive injection molded parts according to claim 9, characterized in that: The filter screen plate (24) is vertically provided with multiple rows of filter holes (32) corresponding to the discharge channel (30).

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