A recycling and injection molding processing device for automobile plastic parts

Abstract

The application discloses a kind of automobile plastic parts recycling reprocessing injection molding processing device, belongs to injection molding processing technical field, is formed by two symmetrical oblique arrangement knock roller and is attached to one side of forming die, and synchronous completion staggered alternate rolling knock action with corresponding sliding sleeve, two groups of knock roller are applied to forming die intermittent balanced excitation force, cooperate forming die side wall resonance hole amplification vibration efficiency, tear curved surface plastic parts and the negative pressure air film of forming die cavity adhering surface in mould cavity, secondly, forming die keeps low-speed circumferential rotation, while knock roller keeps horizontal high-frequency reciprocating rolling knock, form the coupling demolding mode of knock roller static trajectory knock, forming die body synchronous rotation, and forming die one side in rotation state is sequentially attached knock roller, let excitation force evenly cover easy sticking mold area of large curvature arc surface, gradually changing wall thickness, corner transition, completely eliminate mould longitudinal, transverse vibration blind area, improve demolding stability, and guarantee injection molding part forming quality.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, specifically to an injection molding device for recycling and remanufacturing automotive plastic parts. Background Technology

[0002] Currently, automotive plastic components are complex, with finished parts often made from blends of various differentiated plastics such as PP, ABS, PVC, PA, and modified polyester. Waste materials contain impurities such as metal clips, foam, paint layers, mud, oil, and fiberglass fillers. The current industry standard for recycling and injection molding involves manual sorting, mechanical crushing, simple washing, hot melt granulation, and batching / injection molding. Existing specialized injection molding equipment for automotive plastic parts mainly consists of an injection mechanism, a temperature-controlled mold, a mold closing mechanism, and a demolding mechanism. It relies on a screw to extrude molten plastic raw materials, injecting them under high pressure into the mold cavity for cooling and molding.

[0003] Currently, automotive interior trim panels, curved trim panels, curved dashboard shells, and curved anti-collision guards often use large-curvature continuous curved surfaces or curved surface gradually thin-walled composite structures. Existing demolding devices mostly use a single ejector pin rigid ejection method, which is only suitable for demolding regular flat plastic parts. When facing curved components, the curved surface is subjected to uneven force, and the ejector pin is subjected to point force. When in contact with the curved surface, stress concentration is very easy to occur, causing pits on the curved surface of the plastic part, affecting the flatness. Moreover, the curved surface has strong adhesion. After the molten plastic cools, it completely adheres to the curved cavity of the mold. The negative pressure adhesion area of ​​the curved surface is large, and conventional air blowing structures cannot break the adhesion. After the mold is opened, the curved surface is very easy to stick to the mold and be stretched and deformed. Summary of the Invention

[0004] The purpose of this invention is to provide an injection molding processing device for recycling and remanufacturing automotive plastic parts, in order to solve the problems mentioned in the background art. The existing demolding devices mostly adopt a single ejector pin rigid ejection method, which is only suitable for demolding regular flat plastic parts. When facing curved components, the curved surface is subjected to uneven force, and the curved surface has strong adhesion, which easily leads to problems such as curved surface sticking to the mold and pulling deformation during demolding.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An injection molding processing device for recycling and remanufacturing automotive plastic parts includes a frame. A screw extruder is mounted on one side of the frame. A mold cover is inserted and snapped into the discharge port of one end of the screw extruder. A mold base is attached to one side of the mold cover. A sliding mold is fixedly mounted on the other side of the mold base. A fixed seat is provided on the side of the sliding mold away from the mold base. The bottom of the fixed seat and the mold cover is fixed to the frame. Guide posts are fixed through the four corners of the fixed seat, and the other ends of the four guide posts are fixed to the four corners of the mold cover. The sliding mold slides through the four guide posts. An adjusting assembly is installed through the middle of the fixed seat. Two push-pull assemblies are installed at the other end of the adjusting assembly. The push-pull assemblies are installed between the fixed seat and the sliding mold. A material discharge hole is provided inside the frame. The material outlet extends to the top and front of the frame, and the top opening of the material outlet is located below the mold base. Protective doors are installed on the front and rear sides of the frame. The same injection molding assembly rotates through the middle of the sliding mold and the mold base. A drive assembly is meshed on one side of the top of the injection molding assembly. The other end of the drive assembly passes through the sliding mold and is fixed with a bevel gear set. A demolding auxiliary assembly is fixed in the bevel gear set. The demolding auxiliary assembly is installed on the side of the sliding mold. A servo motor is fixed on one side of the demolding auxiliary assembly. The servo motor is installed at the edge of one side of the sliding mold. An ejector assembly is installed through the middle of the injection molding assembly. One end of the ejector assembly extends to the outside of the injection molding assembly and is connected to an air pump. The air pump is installed on one side of the sliding mold.

[0007] As a further embodiment of the present invention, the adjusting assembly includes an electro-hydraulic rod, which is fixedly inserted into a fixed base. A sliding frame is fixed to the end of the electro-hydraulic rod. The sliding frame has a cross-shaped design, and vertical plates are fixed to the front and rear ends respectively. Guide rods are slidably inserted through the ends of the vertical plates respectively, and one end of the guide rod is fixed to one side of the fixed base.

[0008] As a further embodiment of the present invention, the push-pull assembly includes a first hinge seat and a second hinge seat, which are respectively fixed on the opposite surfaces of the fixed seat and the sliding mold. A first connecting rod and a second connecting rod are rotatably connected to the first hinge seat and the second hinge seat respectively by a pin. The first connecting rod and the second connecting rod are rotatably connected to each other by a pin. A deflecting rod is rotatably connected between the two upper and lower first connecting rods by a pin. The opposite ends of the two deflecting rods are rotatably connected to the ends of the sliding frame by a pin.

[0009] As a further embodiment of the present invention, the injection molding assembly includes a molding die, a support bearing is rotatably sleeved on the outside of the molding die, the support bearing is fixed inside the mold base, the molding die rotates through the mold base and the sliding die, a worm gear and a retaining ring are fixed on one side of the outside of the molding die, a plurality of balls are installed on the side of the retaining ring near the sliding die, and the balls overlap with the sliding die, a resonance hole is opened in the side wall of the molding die, and an ejection hole is opened in the mold cavity inside the molding die, and the ejector assembly is installed through the ejection hole.

[0010] As a further embodiment of the present invention, the drive assembly includes a worm gear that meshes with the top of a worm wheel. One end of the worm gear is fixed with a connecting shaft, and the outside of the connecting shaft is rotatably mounted on one side of the sliding mold through a bushing. A first bevel gear is fixed to the end of the connecting shaft away from the worm gear. A second bevel gear meshes with the first bevel gear. The diameter of the second bevel gear is smaller than the diameter of the first bevel gear. A drive shaft is fixed to the middle of the second bevel gear, and the top end of the drive shaft is rotatably connected to the sliding mold through a bushing.

[0011] As a further embodiment of the present invention, the demolding auxiliary component includes a fixed frame, which is U-shaped and fixed to one side of the sliding mold. Two slide rods are fixed between the fixed frame and the sliding mold. Slide sleeves are sleeved on the outside of the slide rods. The slide sleeves are slidably connected to the outside of the protrusions fixed on the outer wall of the slide rods. Extension rods are fixed to one side of the two slide sleeves respectively. A striking roller is installed on one side of the extension rod. The two striking rollers are inclinedly arranged on one side of the forming mold and are symmetrically designed about the middle of the forming mold.

[0012] As a further embodiment of the present invention, connecting plates are fixedly connected to the sides of the two sliding sleeves away from the extension rod, and the other end of the connecting plate is arc-shaped with a sliding column fixed on its inner wall. A rotating roller is provided between the two sliding columns. One end of the rotating roller is fixed to the output shaft of the servo motor. Two guide grooves are opened on the outside of the rotating roller. The guide grooves are spirally designed and surround the rotating roller. The connecting parts of the two guide grooves that are far apart from each other are slidably connected to the two sliding columns. The end of the rotating roller away from the servo motor is rotatably connected to the edge of the sliding mold side through a bushing. A bevel gear set is fixed to the end of the rotating roller near the sliding mold. The bevel gear set is composed of two meshing bevel gears. The two bevel gears are fixed to the bottom end of the transmission shaft and the end of the rotating roller, respectively.

[0013] As a further embodiment of the present invention, the ejector assembly includes a piston cylinder, which is fixed inside the molding mold and away from the mold cavity. A piston rod is provided inside the piston cylinder, one end of which passes through the piston cylinder and is fixed with a top block. The top block overlaps in the ejection hole, and the cross-sectional shape of the top block and the ejection hole is conical. A spring is fixed to the other end of the piston rod, and the spring is fixed to one side of the inner wall of the piston cylinder. A rotary joint is installed through the piston cylinder at the end away from the top block. An air inflator is rotatably fitted inside the rotary joint. The other end of the air inflator is connected to an air pump. Several air guide pipes are connected through the piston cylinder on the side near the top block, and the other end of the air guide pipes extends into the ejection hole.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention drives the rotating roller to rotate, causing the sliding columns on both sides to reciprocate horizontally in a staggered and timed manner. The staggered sliding columns synchronously drive the two sets of sliding sleeves on the left and right sides to alternately extend and slide along the sliding rod. An extension rod is fixed on the outside of the sliding sleeve. Two symmetrically inclined striking rollers are attached to one side of the forming mold and synchronously complete the staggered and alternating rolling and striking action with the corresponding sliding sleeve. The two sets of striking rollers apply intermittent and balanced excitation force to the forming mold. The vibration wave is transmitted along the wall thickness of the forming mold. With the help of the resonance hole on the side wall of the forming mold, the vibration efficiency is amplified, and the bending is quickly torn. The negative pressure air film between the plastic part and the mold cavity of the molding mold, and the low-speed circular rotation of the molding mold, while the striking roller maintains horizontal high-frequency reciprocating rolling and striking, form a coupled demolding mode of static trajectory striking of the striking roller and synchronous rotation of the molding mold body. In the rotation state, the striking roller is sequentially attached to the entire area of ​​one side of the molding mold, so that the excitation force evenly covers the easily sticking areas of large curvature arc surface, gradual wall thickness, and edge transition, completely eliminating the longitudinal and lateral vibration blind spots of the mold, improving demolding stability, and ensuring the molding quality of the injection molded part.

[0016] 2. This invention introduces high-pressure airflow into the piston cylinder via an inflation pipe and a rotary joint. The high-pressure airflow compresses the internal space of the piston cylinder, pushing the piston rod to move towards the mold cavity, causing the conical ejector block to eject synchronously. Furthermore, the piston at one end of the piston rod moves to the right inside the piston cylinder, compressing the gas on the right side of the piston cylinder. After being diverted and stabilized through the air guide pipe, the gas is evenly injected into the ejector hole. During the process of the conical ejector block pressing against the inner wall of the plastic part to the right and slightly compressing and pushing to form the injection molded part, the injection molded part is subjected to surface-like pushing. Under the action of force, the center of the plastic part is the first to detach from the inner wall of the mold cavity, creating a tiny pressure relief gap between the middle of the injection molded part and the inner wall of the mold cavity. At the same time, the high-pressure airflow accumulated inside the ejector hole seeps into the micro gap. The airflow gradually diffuses outward along the arc-shaped gap, opening up the interface between the plastic part and the cavity from top to bottom and from the inside to the outside. Combined with the vibration excitation force generated by the external hammering roller, the adsorption interface of the plastic part is peeled off in both directions, breaking the negative pressure adhesion of the curved mold cavity and avoiding the problems of local sticking, pulling and whitening of the plastic part and deformation of the curved surface. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the fixing base and adjustment assembly of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the adjustment component of the present invention;

[0021] Figure 4 This is a schematic diagram of the sliding mold structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the sliding mold and mold base of the present invention;

[0023] Figure 6 This is a schematic diagram of the cross-section of the sliding mold of the present invention;

[0024] Figure 7 This is a schematic diagram of the cross-section of the mold base of the present invention;

[0025] Figure 8 This is a schematic diagram of the connection between the injection molding component and the drive component of the present invention;

[0026] Figure 9 This is a schematic diagram of the demolding auxiliary component of the present invention;

[0027] Figure 10 This is a schematic diagram of the cross-section of the molding die of the present invention;

[0028] Figure 11 For the present invention Figure 10 Enlarged structural diagram at point A;

[0029] Figure 12 This is a schematic diagram of the connection between the top material assembly and the air pump of the present invention;

[0030] Figure 13 This is a schematic diagram of the cross-sectional structure of the top material assembly of the present invention;

[0031] Figure 14 This is a schematic diagram of the connection between the sliding frame and the deflection rod of the present invention;

[0032] Figure 15This is a schematic diagram showing the positional relationship between the striking roller and the forming mold in this invention.

[0033] Figure 16 This is a schematic diagram of the unfolded structure of the rotating roller and sliding column of the present invention.

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 1. Frame; 2. Screw extruder; 3. Die cover; 4. Die base; 5. Sliding die; 6. Fixed base; 7. Guide column; 8. Adjustment assembly; 801. Electro-hydraulic rod; 802. Sliding frame; 803. Vertical plate; 804. Guide rod; 9. Push-pull assembly; 901. First hinge seat; 902. Second hinge seat; 903. First connecting rod; 904. Second connecting rod; 905. Deflection rod; 10. Protective door; 11. Material discharge hole; 12. Injection molding assembly; 121. Molding die; 122. Support bearing; 123. Worm gear; 124. Retaining ring; 125. Ball bearing; 126. Resonance hole; 127. Ejection hole; 13. Drive assembly; 131. Worm gear; 132. Connecting shaft; 133. First bevel gear; 134. Second bevel gear; 135. Transmission shaft; 14. Demolding auxiliary assembly; 141. Fixing frame; 142. Slide rod; 143. Slide sleeve; 144. Extension rod; 145. Striking roller; 146. Rotary roller; 147. Guide groove; 148. Slide column; 149. Connecting plate; 15. Servo motor; 16. Ejector assembly; 161. Piston cylinder; 162. Piston rod; 163. Ejector block; 164. Spring; 165. Rotary joint; 166. Inflation pipe; 167. Air guide pipe; 17. Air pump; 18. Bevel gear set. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-16 The present invention provides a technical solution:

[0038] An injection molding processing device for recycling and remanufacturing automotive plastic parts includes a frame 1. A screw extruder 2 is mounted on one side of the frame 1. A mold cover 3 is inserted and snapped through the discharge port of one end of the screw extruder 2. A mold base 4 is attached to one side of the mold cover 3. A sliding mold 5 is fixedly mounted on the other side of the mold base 4. A fixed seat 6 is provided on the side of the sliding mold 5 away from the mold base 4. The bottom of the fixed seat 6 and the mold cover 3 are fixed to the frame 1. Guide pillars 7 are fixed through the four corners of the fixed seat 6. The other ends of the four guide pillars 7 are fixed at the four corners of the mold cover 3. The sliding mold 5 slides through the four guide pillars 7 and slides axially against the four guide pillars 7 to maintain the coaxiality of the mold base 4 and the sliding mold 5, so as to achieve parallel and uniform mold opening, keep the four corners of the sliding mold 5 under synchronous force, and have a uniform mold opening gap.

[0039] An adjustment assembly 8 is installed through the middle of the fixed base 6. The adjustment assembly 8 includes an electric hydraulic rod 801, which is fixed through the fixed base 6. A sliding frame 802 is fixed to the end of the electric hydraulic rod 801. The sliding frame 802 is cross-shaped and has vertical plates 803 fixed at its front and rear ends. Guide rods 804 slide through the two ends of the vertical plates 803. One end of the guide rod 804 is fixed to one side of the fixed base 6.

[0040] During operation, the electric hydraulic rod 801 retracts, pulling the cross-shaped sliding frame 802 to horizontally reset and move towards the fixed seat 6. The sliding frame 802 drives the two vertical plates 803 to slide to the left along the guide rod 804 in sync. The guide rod 804 continuously provides lateral limit, counteracting the deflection torque generated by the retraction force, and preventing the sliding frame 802 from jamming or shifting.

[0041] Two push-pull components 9 are installed at the other end of the adjustment component 8. The push-pull components 9 are installed between the fixed base 6 and the sliding mold 5. The frame 1 has a discharge hole 11 inside. The discharge hole 11 extends to the top and front of the frame 1, and the top opening of the discharge hole 11 is located below the mold base 4. Protective doors 10 are installed on the front and rear sides of the frame 1 respectively. The front and rear protective doors 10 of the frame 1 can block the splashing of debris and waste during the injection or demolding stage, thereby improving the safety of use.

[0042] The push-pull assembly 9 includes a first hinge seat 901 and a second hinge seat 902. The first hinge seat 901 and the second hinge seat 902 are respectively fixed on the opposite surfaces of the fixed seat 6 and the sliding mold 5. The first hinge seat 901 and the second hinge seat 902 are respectively rotatably connected by a first connecting rod 903 and a second connecting rod 904 via a pin. The first connecting rod 903 and the second connecting rod 904 are rotatably connected by a pin. The middle part between the two upper and lower first connecting rods 903 is rotatably connected by a pin. The opposite ends of the two corresponding deflection rods 905 are rotatably connected to the upper and lower ends of the sliding frame 802 via a pin.

[0043] During operation, the sliding frame 802 moves to the left, simultaneously pulling the deflection rod 905 to rotate in the opposite direction. The angle of the deflection rod 905 is reset, releasing the pushing limit on the first connecting rod 903 and the second connecting rod 904 on the upper and lower sides. The two sets of connecting rods are brought together in the opposite direction by the pre-tightening force of the sliding mold 5, and rotate and fold around the pin. With the help of the hinge fulcrum of the first hinge seat 901 and the second hinge seat 902, the first connecting rod 903 and the second connecting rod 904 are brought together to generate a reverse axial pull, which evenly pulls the sliding mold 5 to move to the left synchronously, so that the four corners of the sliding mold 5 are simultaneously stressed, the mold opening gap is uniform, and it will not scratch the outer edge of the curved plastic part.

[0044] A common injection molding assembly 12 rotates through the middle of the sliding mold 5 and the mold base 4. The injection molding assembly 12 includes a molding mold 121, and a support bearing 122 is rotatably sleeved on the outside of the molding mold 121. The support bearing 122 is fixed inside the mold base 4 and supports and limits the molding mold 121, thereby improving the stability of the molding mold 121 during rotation. The molding mold 121 rotates through the mold base 4 and the sliding mold 5. A worm gear 123 and a retaining ring 124 are fixed on one side of the outside of the molding mold 121. Several balls 125 are installed on the side of the retaining ring 124 near the sliding mold 5, and the balls 125 overlap with the sliding mold 5. The balls 125 on the side of the retaining ring 124 reduce the rotational friction resistance of the molding mold 121, avoid sudden changes in impact load caused by rotational jamming, and ensure the synchronization of rotation and impact actions. The molding mold 121 has a resonance hole 126 inside its side wall. The resonance hole 126 in the side wall of the molding mold 121 can amplify the vibration efficiency and quickly tear the negative pressure air film between the curved plastic part and the mold cavity of the molding mold 121. Furthermore, the mold cavity inside the molding mold 121 has an ejection hole 127, and the ejector assembly 16 is installed through the ejection hole 127. The resonance hole 126 is a closed cavity groove machined inside the side wall of the molding mold 121. The cross-sectional shape of the resonance hole 126 is a long, arc-shaped blind groove, arranged around the outer wall of the large curvature cavity of the molding mold 121 and the wall thickness interlayer, without penetrating the inner surface of the mold cavity.

[0045] The resonance hole 126 adopts the principle of closed-cell cavity resonance. When the striking roller 145 applies periodic mechanical excitation to the molding mold 121, the closed air in the cavity is repeatedly compressed and expanded with the vibration to form an acoustic standing wave. When the striking excitation frequency matches the inherent resonant frequency of the cavity, resonance superposition occurs. At the same time, the resonance hole 126 thins the local mold wall and blocks the rapid dissipation of vibration energy along the metal substrate. The weak striking vibration is amplified and uniformly transmitted to the inner cavity wall of the molding mold 121. The high-frequency micro-vibration continuously disturbs the negative pressure bonding air film between the plastic part and the mold cavity, quickly tearing the vacuum adsorption layer. With the rotation of the molding mold 121, the vibration fully covers the curved thin wall and corner areas, and assists the airflow to push and complete the smooth demolding.

[0046] A drive assembly 13 is meshed and installed on one side of the top of the injection molding assembly 12. The drive assembly 13 includes a worm 131, which is meshed with the top of a worm wheel 123. A connecting shaft 132 is fixed to one end of the worm 131, and the outside of the connecting shaft 132 is rotatably mounted on one side of the sliding mold 5 through a bushing. A first bevel gear 133 is fixed to the end of the connecting shaft 132 away from the worm 131. A second bevel gear 134 is meshed with the first bevel gear 133. The diameter of the second bevel gear 134 is smaller than the diameter of the first bevel gear 133. A transmission shaft 135 is fixed to the middle of the second bevel gear 134, and the top end of the transmission shaft 135 is rotatably connected to the sliding mold 5 through a bushing.

[0047] During operation, the first bevel gear 133 is linked to the shaft 132 and the worm gear 131, which rotate coaxially. The worm gear 131 vertically meshes with the worm wheel 123 fixed on the outside of the molding mold 121. The worm wheel 123 is driven by force to rotate the integral molding mold 121 around the support bearing 122 at a uniform speed. During the low-speed rotation of the molding mold 121, the molten recycled plastic in the mold cavity is evenly spread by centrifugal force, conforming to the large curvature curved surface cavity, solving the problems of insufficient material at the edges and corners and uneven thickness in traditional static injection molding.

[0048] The other end of the drive assembly 13 passes through the sliding mold 5 and is fixed with a bevel gear set 18. A demolding auxiliary assembly 14 is fixed in the bevel gear set 18. The demolding auxiliary assembly 14 is installed on the side of the sliding mold 5. A servo motor 15 is fixed on one side of the demolding auxiliary assembly 14. The servo motor 15 is installed at the edge of one side of the sliding mold 5.

[0049] The demolding auxiliary component 14 includes a fixed frame 141, which is U-shaped and fixed to one side of the sliding mold 5. Two slide rods 142 are fixed between the fixed frame 141 and the sliding mold 5. A slide sleeve 143 is sleeved on the outside of the slide rod 142. The slide sleeve 143 is slidably connected to the outer wall of the slide rod 142 and the inner wall of the slide sleeve 143 is provided with a strip groove that cooperates with the slide rod to slide. When the slide sleeve 143 is pulled to slide horizontally back and forth along the outer wall of the slide rod 142, the slide rod limits the slide rod 142 through the strip groove, thereby limiting the radial deflection of the slide sleeve 143.

[0050] An extension rod 144 is fixed to one side of each of the two sliding sleeves 143. A striking roller 145 is installed on one side of the extension rod 144. The two striking rollers 145 are inclinedly arranged on one side of the forming mold 121 and are symmetrically designed about the middle of the forming mold 121.

[0051] During operation, the outer wall of the slide rod 142 has a limiting protrusion, and the strip groove inside the slide sleeve 143 engages with the protrusion, completely locking the radial rotation of the slide sleeve 143, allowing it to slide horizontally along the axial direction of the slide rod 142. The extension rods 144 fixed to the outer sides of the two slide sleeves 143 move synchronously, driving the two inclined and symmetrically arranged striking rollers 145 to conform to one side of the molding mold 121 and perform synchronous reciprocating rolling and striking motion. The striking rollers 145 are arranged on the exposed outer wall side of the molding mold 121 that extends out of the sliding mold 5, and the striking points of the striking rollers 145 are aligned with the easily sticking areas of the curved surface, thin wall, and corners inside the mold cavity of the molding mold 121. During the reciprocating striking process, the two striking rollers 145 can periodically adhere to and disengage from the outer wall of the forming mold 121. Each contact and impact generates a pulse impact, forming intermittent excitation. This allows the vibration generated by the striking rollers 145 striking one side of the forming mold 121 to be directly transmitted to the mold cavity of the forming mold 121. In conjunction with the worm gear 123 driving the forming mold 121 to rotate at a low speed, different sections of the outer wall of the forming mold 121 take turns contacting the striking rollers 145. The balanced intermittent excitation completely covers all easily sticking areas of the large curvature arc surface, the gradually thin wall, and the edge transition, completely eliminating the vibration blind zone.

[0052] As a further embodiment of the present invention, a connecting plate 149 is fixedly connected to the side of the two sliding sleeves 143 away from the extension rod 144, and the other end of the connecting plate 149 is arc-shaped and a sliding column 148 is fixed on the inner wall. A rotating roller 146 is provided between the two sliding columns 148. One end of the rotating roller 146 is fixed to the output shaft of the servo motor 15. Two guide grooves 147 are opened on the outside of the rotating roller 146. The guide grooves 147 are spiral-shaped and surround the rotating roller 146. The connecting parts of the two guide grooves 147 that are far apart from each other are slidably connected to the two sliding columns 148 respectively. The end of the rotating roller 146 away from the servo motor 15 is rotatably connected to the edge of the sliding mold 5 through a bushing. A bevel gear set 18 is fixed to the end of the rotating roller 146 near the sliding mold 5. The bevel gear set 18 is composed of two meshing bevel gears. The two bevel gears are fixed to the bottom end of the transmission shaft 135 and the end of the rotating roller 146 respectively.

[0053] During operation, the servo motor 15 drives the bevel gear set 18. The bevel gear set 18 consists of two meshing bevel gears, which are respectively fixed to the bottom end of the drive shaft 135 and the end of the rotating roller 146. Their meshing action drives the drive shaft 135 and the rotating roller 146 to rotate. Two spiral guide grooves 147 are formed on the outer wall of the rotating roller 146, symmetrical about its center. Two sets of sliding pillars 148 slide into the two spiral guide grooves 147. The rotating roller 146 rotates... During the rotation, the two spiral guide grooves 147 alternately move the two sliding columns 148 on both sides, causing the two sliding columns 148 to form a staggered and timed reciprocating horizontal displacement; the staggered sliding column 148 synchronously drives the two sets of sliding sleeves 143 on the left and right to alternately extend and slide along the sliding rod 142; the extension rod 144 is fixed on the outside of the sliding sleeve 143, and the two symmetrically inclined striking rollers 145 are attached to one side of the forming mold 121, and synchronously complete the staggered and timed alternating rolling and striking action with the corresponding sliding sleeve 143, which can apply intermittent and balanced excitation force to the forming mold 121.

[0054] An ejector assembly 16 is installed through the middle of the injection molding assembly 12. One end of the ejector assembly 16 extends to the outside of the injection molding assembly 12 and is connected to an air pump 17, which is installed on one side of the sliding mold 5. The ejector assembly 16 includes a piston cylinder 161, which is fixed inside the molding mold 121 and away from the mold cavity. A piston rod 162 is provided inside the piston cylinder 161. One end of the piston rod 162 passes through the piston cylinder 161 and is fixed with an ejector block 163. The ejector block 163 overlaps in the ejection hole 127, and the cross-sectional shape of the ejector block 163 and the ejection hole 127 is conical. A spring 164 is fixed to the other end of the piston rod 162. The spring 164 is fixed to one side of the inner wall of the piston cylinder 161. A rotary joint 165 is installed through the piston cylinder 161 away from the ejector block 163. An air inlet pipe 166 is rotated inside the rotary joint 165. The other end of the air inlet pipe 166 is connected to an air pump 17. Several air guide pipes 167 are connected through the piston cylinder 161 on the side near the ejector block 163. The other end of the air guide pipes 167 extends into the ejection hole 127.

[0055] During operation, as the conical top block 163 presses against the inner wall of the plastic part to the right and gently pushes it to form the injection molded part, the injection molded part is subjected to a planar pushing force. The center of the plastic part is the first to detach from the inner wall of the mold cavity, causing a tiny pressure relief gap to be generated between the middle of the injection molded part and the inner wall of the mold cavity of the molding mold 121. At the same time, the high-pressure airflow accumulated inside the ejector hole 127 seeps into the micro gap. The airflow gradually diffuses outward along the arc-shaped gap, opening up the interface between the plastic part and the cavity from top to bottom and from the inside to the outside. Combined with the vibration excitation force generated by the external striking roller 145, the plastic part adsorption interface is peeled off in both directions, breaking the negative pressure adhesion of the curved mold cavity.

[0056] Working principle of this invention:

[0057] After being crushed, washed, cleaned, and granulated, the mixed recycled plastic granules of PP, ABS, and PVC from waste automobiles are fed into the processing chamber of the screw extruder 2. The screw extruder 2 is started, and the pre-treated waste automobile plastic granules are sheared and melted at high temperature. The screw extrusion generates high pressure, and the homogeneous molten recycled plastic is injected from the discharge port into the internal flow channel of the snap-fit ​​mold cover 3. The mold cover 3 and the mold base 4 are sealed and overlapped. The molten plastic is uniformly filled into the curved mold cavity of the forming mold 121 along the internal guide channel of the mold base 4. After the molten plastic fills the mold cavity, the screw extruder 2 stops feeding and enters the constant temperature and pressure molding process.

[0058] The servo motor 15 drives the bevel gear set 18 to work. The bevel gear set 18 is composed of two meshing bevel gears. The two bevel gears are fixed at the bottom end of the transmission shaft 135 and the end of the roller 146, respectively. The meshing action between them drives the transmission shaft 135 to rotate. The second bevel gear 134 outside the transmission shaft 135 rotates accordingly and drives the first bevel gear 133 to rotate. The first bevel gear 133 is linked to the shaft 132 and the worm gear 131 to rotate coaxially. The worm gear 131 vertically meshes with the worm wheel 123 fixed on the outside of the molding mold 121. The worm wheel 123 is forced to drive the integral molding mold 121 to rotate at a constant speed around the support bearing 122. During the low-speed rotation of the molding mold 121, the molten recycled plastic in the mold cavity is evenly spread by centrifugal force, conforming to the large curvature curved surface cavity, preventing the problem of missing material and uneven thickness at the edges and corners of the curved surface formed by static injection molding.

[0059] After the injection molding and pressure holding are completed, the electric hydraulic rod 801 retracts, pulling the cross-shaped sliding frame 802 to horizontally reset and move towards the fixed seat 6. The sliding frame 802 drives the two vertical plates 803 to slide to the left along the guide rod 804. The guide rod 804 continuously provides lateral limiting, counteracting the deflection torque generated by the retraction force, and preventing the sliding frame 802 from jamming or shifting. The leftward movement of the sliding frame 802 simultaneously pulls the deflection rod 905 to rotate in the opposite direction. The angle of the deflection rod 905 is reset, releasing the pushing limit on the upper and lower first connecting rods 903 and second connecting rods 904. The two sets of connecting rods are controlled by the sliding mold 5. The pre-tightening force is reversed and the mold folds around the pin. With the help of the hinge fulcrum of the first hinge seat 901 and the second hinge seat 902, the first connecting rod 903 and the second connecting rod 904 are pulled together to generate a reverse axial pull, which evenly pulls the sliding mold 5 to move to the left synchronously. The sliding mold 5 slides axially in contact with the four guide pillars 7 throughout the process, maintaining the coaxiality of the mold base 4, the sliding mold 5 and the forming mold 121, realizing parallel and uniform mold opening, keeping the four corners of the sliding mold 5 under synchronous force, and the mold opening gap is uniform. It will not scratch the outer edge of the curved plastic part, and prevent edge cracking and curved surface scratches from occurring in the stage when the semi-finished plastic part is not fully shaped.

[0060] During the demolding start-up phase, the output shaft of the servo motor 15 drives the rotating roller 146 to rotate. Two spiral guide grooves 147 are formed on the outer wall of the rotating roller 146, which surround the rotating roller 146 and are symmetrical about the center of the rotating roller 146. Two sets of sliding pillars 148 slide into the two spiral guide grooves 147 respectively. During the rotation of the rotating roller 146, the two spiral guide grooves 147 alternately move the sliding pillars 148 on both sides, so that the sliding pillars 148 on both sides form a staggered and timed reciprocating horizontal displacement. The sliding pillars 148 are connected to the sliding sleeve through the connecting plate 149. A rigid connection is established at 143. Sleeve 143 is fitted onto the outside of slide rod 142 with a limiting protrusion. The protrusion restricts sleeve 143 to axial translation along slide rod 142, preventing radial rotation. The staggered sliding column 148 synchronously drives the left and right sets of sleeves 143 to alternately extend and retract along slide rod 142. An extension rod 144 is fixed to the outside of sleeve 143. Two symmetrically inclined striking rollers 145 are attached to one side of the molding mold 121 and synchronously complete staggered alternating rolling and striking actions with the corresponding sleeve 143. With a symmetrically inclined structure, two sets of striking rollers 145 apply intermittent, balanced excitation force to the molding die 121. The vibration wave is transmitted along the wall thickness of the molding die 121, and the vibration efficiency is amplified by the resonance holes 126 on the side wall of the molding die 121. This quickly tears the negative pressure air film between the curved plastic part and the mold cavity of the molding die 121. Next, relying on the meshing speed-increasing transmission of the second bevel gear 134 and the first bevel gear 133, the worm gear 131 continuously drives the worm wheel 123 to rotate, ultimately driving the molding die 121 to rotate around the support shaft. While the mold 121 rotates slowly and uniformly, the symmetrically inclined striking rollers 145 on both sides maintain horizontal high-frequency reciprocating rolling and striking, forming a coupled demolding mode in which the striking rollers 145 strike the mold 121 in a static trajectory and the mold 121 rotates synchronously. In the rotating state, the striking rollers 145 are in series on one side of the mold 121, so that the excitation force evenly covers the easily sticking areas of the large curvature arc surface, the gradual wall thickness, and the corner transition, completely eliminating the longitudinal and transverse vibration blind spots of the mold.

[0061] Vibration breaks the negative pressure synchronously, and the air pump 17 mounted on the side of the sliding mold 5 starts. High-pressure airflow is introduced into the piston cylinder 161 through the air inlet pipe 166 and the rotary joint 165. The rotary joint 165 is adapted to the rotation of the molding mold 121, isolating the interference of dynamic and static pipes and ensuring stable air supply during rotation. The high-pressure airflow squeezes the internal space of the piston cylinder 161, overcoming the elastic force of the spring 164 to push the piston rod 162 to move towards the mold cavity, driving the conical ejector block 163 to be ejected synchronously. Moreover, the piston at one end of the piston rod 162 moves to the right inside the piston cylinder 161, which can squeeze the gas on the right side of the piston cylinder 161. After being diverted and stabilized by the air guide pipe 167, it is evenly filled into the ejector hole 127. During the process of the conical ejector block 163 pressing against the inner wall of the plastic part to the right and slightly squeezing and pushing to form the injection molded part, the injection molded part is subjected to a surface pushing force. The center of the plastic part first detaches from the inner wall of the mold cavity, creating a tiny pressure relief gap between the middle of the injection molded part and the inner wall of the mold cavity of the molding mold 121. At the same time, the high-pressure airflow accumulated inside the ejector hole 127 seeps into the micro gap. The airflow gradually diffuses outward along the arc-shaped gap, opening up the interface between the plastic part and the cavity from top to bottom and from inside to outside. Combined with the vibration excitation force generated by the external striking roller 145, the plastic part adsorption interface is peeled off in both directions, breaking the negative pressure adhesion of the curved mold cavity. After demolding, the air pump 17 depressurizes, the spring 164 rebounds and pulls the piston rod 162 and the ejector block 163 to reset, sealing the ejector hole 127 and completing the single demolding reset. The demolded curved automotive plastic product falls vertically by its own weight and slides out from the front discharge port of the frame 1 through the discharge hole 11 opened directly below the mold base 4, completing the automatic unloading.

Claims

1. An injection molding processing device for recycling and remanufacturing automotive plastic parts, comprising a frame (1), characterized in that: A screw extruder (2) is installed on one side of the frame (1). A die cover (3) is inserted through the discharge port of one end of the screw extruder (2). A die base (4) is attached to one side of the die cover (3). A sliding die (5) is fixedly installed on the other side of the die base (4). A fixed seat (6) is provided on the side of the sliding die (5) away from the die base (4). The bottom of the fixed seat (6) and the die cover (3) are fixed to the frame (1). Guide posts (7) are fixed through the four corners of the fixed seat (6). The other ends of the four guide pillars (7) are fixed at the four corners of the mold cover (3). The sliding mold (5) slides through the outside of the four guide pillars (7). An adjustment component (8) is installed through the middle of the fixed seat (6). Two push-pull components (9) are installed at the other end of the adjustment component (8). The push-pull components (9) are installed between the fixed seat (6) and the sliding mold (5). A material drop hole (11) is opened inside the frame (1). The material drop hole (11) extends to the top and front of the frame (1) and drops... The top opening of the material hole (11) is located below the mold base (4). Protective doors (10) are installed on the front and rear sides of the frame (1). The same injection molding assembly (12) is rotatably connected through the middle of the sliding mold (5) and the mold base (4). A drive assembly (13) is meshed on one side of the top of the injection molding assembly (12). The other end of the drive assembly (13) passes through the sliding mold (5) and is fixed with a bevel gear set (18). A demolding auxiliary assembly is fixed in the bevel gear set (18). 14), the demolding auxiliary component (14) is installed on the side of the sliding mold (5), a servo motor (15) is fixed on one side of the demolding auxiliary component (14), the servo motor (15) is installed at the edge of one side of the sliding mold (5), an ejector component (16) is installed through the middle of the injection molding component (12), one end of the ejector component (16) extends to the outside of the injection molding component (12) and is connected to an air pump (17), the air pump (17) is installed on one side of the sliding mold (5).

2. The automotive plastic parts recycling and remanufacturing injection molding device according to claim 1, characterized in that: The adjustment assembly (8) includes an electric hydraulic rod (801), which is fixed in the fixed base (6). A sliding frame (802) is fixed at the end of the electric hydraulic rod (801). The sliding frame (802) is cross-shaped and has vertical plates (803) fixed at its front and rear ends respectively. Guide rods (804) slide through both ends of the vertical plates (803). One end of the guide rod (804) is fixed to one side of the fixed base (6).

3. The automotive plastic parts recycling and remanufacturing injection molding device according to claim 2, characterized in that: The push-pull assembly (9) includes a first hinge seat (901) and a second hinge seat (902). The first hinge seat (901) and the second hinge seat (902) are respectively fixed on the opposite surfaces of the fixed seat (6) and the sliding mold (5). The first hinge seat (901) and the second hinge seat (902) are respectively rotatably connected by a first connecting rod (903) and a second connecting rod (904) through a pin. The first connecting rod (903) and the second connecting rod (904) are rotatably connected by a pin. The two first connecting rods (903) above and below are rotatably connected by a pin. The opposite ends of the two deflection rods (905) are rotatably connected to the end of the sliding frame (802) through a pin.

4. The automotive plastic parts recycling and remanufacturing injection molding device according to claim 1, characterized in that: The injection molding assembly (12) includes a molding die (121), a support bearing (122) is rotatably sleeved on the outside of the molding die (121), the support bearing (122) is fixed inside the mold base (4), the molding die (121) rotates through the mold base (4) and the sliding mold (5), a worm gear (123) and a retaining ring (124) are fixed on one side of the outside of the molding die (121), a number of balls (125) are installed on the side of the retaining ring (124) near the sliding mold (5), and the balls (125) overlap with the sliding mold (5), a resonance hole (126) is opened in the side wall of the molding die (121), and an ejection hole (127) is opened in the mold cavity inside the molding die (121), and the ejector assembly (16) is installed through the ejection hole (127).

5. The automotive plastic parts recycling and remanufacturing injection molding device according to claim 4, characterized in that: The drive assembly (13) includes a worm (131) that meshes with the top of a worm wheel (123). One end of the worm (131) is fixed with a connecting shaft (132), and the outside of the connecting shaft (132) is rotated through a bushing on one side of the sliding mold (5). The end of the connecting shaft (132) away from the worm (131) is fixed with a first bevel gear (133). The first bevel gear (133) is externally meshed with a second bevel gear (134). The diameter of the second bevel gear (134) is smaller than the diameter of the first bevel gear (133). A transmission shaft (135) is fixed in the middle of the second bevel gear (134), and the top end of the transmission shaft (135) is rotatably connected to the sliding mold (5) through a bushing.

6. The automotive plastic parts recycling and remanufacturing injection molding device according to claim 5, characterized in that: The demolding auxiliary component (14) includes a fixed frame (141), which is U-shaped and fixed to one side of the sliding mold (5). Two slide rods (142) are fixed between the fixed frame (141) and the sliding mold (5). Slide sleeves (143) are sleeved on the outside of the slide rods (142). The slide sleeves (143) are slidably connected to the outside of the protrusions fixed on the outer wall of the slide rods (142). Extension rods (144) are fixed on one side of the two slide sleeves (143). A striking roller (145) is installed on one side of the extension rod (144). The two striking rollers (145) are inclinedly arranged on one side of the forming mold (121) and are symmetrically designed about the middle of the forming mold (121).

7. The automotive plastic parts recycling and remanufacturing injection molding device according to claim 6, characterized in that: Two sliding sleeves (143) are fixedly connected to connecting plates (149) on the side away from the extension rod (144). The other end of the connecting plate (149) is arc-shaped and has a sliding column (148) fixed on its inner wall. A rotating roller (146) is provided between the two sliding columns (148). One end of the rotating roller (146) is fixed to the output shaft of the servo motor (15). Two guide grooves (147) are opened on the outside of the rotating roller (146). The guide grooves (147) are spiral-shaped and surround the rotating roller (144). 6) In one revolution, the two guide grooves (147) are connected to the two sliding columns (148) respectively at their far-away connection points. The end of the roller (146) away from the servo motor (15) is rotatably connected to the edge of the sliding mold (5) through a bushing. The end of the roller (146) near the sliding mold (5) is fixed with a bevel gear set (18). The bevel gear set (18) is composed of two meshing bevel gears. The two bevel gears are fixed to the bottom end of the transmission shaft (135) and the end of the roller (146) respectively.

8. The automotive plastic parts recycling and remanufacturing injection molding device according to claim 7, characterized in that: The ejector assembly (16) includes a piston cylinder (161), which is fixed inside the molding die (121) and away from the mold cavity. A piston rod (162) is provided inside the piston cylinder (161). One end of the piston rod (162) passes through the piston cylinder (161) and is fixed with an ejector block (163). The ejector block (163) overlaps in the ejection hole (127), and the cross-sectional shape of the ejector block (163) and the ejection hole (127) is conical. A spring (164) is fixed to the other end of the piston rod (162). The spring (164) is fixed to one side of the inner wall of the piston cylinder (161). A rotary joint (165) is installed through one end of the piston cylinder (161) away from the top block (163). An air inlet tube (166) is sleeved and rotated inside the rotary joint (165). The other end of the air inlet tube (166) is connected to the air pump (17). Several air guide tubes (167) are connected through one side of the piston cylinder (161) near the top block (163). The other end of the air guide tube (167) extends into the ejector hole (127).

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