Injection molding equipment and process for producing plastic automobile ornament

Abstract

The invention relates to the technical field of injection molding waste plastic recovery, in particular to injection molding equipment and a process for producing plastic automobile ornaments. The equipment comprises an injection machine and an online recycling mechanism, the injection machine is provided with a double-channel solution cavity composed of a new material main runner and a waste material returning cavity, and the tail ends of the two channels converge in a 30-degree Y shape; the on-line recovery mechanism comprises a waste conveyor belt, a crushing mechanism and a transmission device, a magnetic separation impurity removal device is arranged in the crushing mechanism, and a discharge end is connected with the batching mechanism. Through double channels and a Y-shaped confluence structure, production waste is subjected to online recovery and crushing and then is fused, mixed and reused with new materials, the waste utilization rate is increased, and the cost is reduced. The magnetic separation and impurity removal device efficiently removes metal impurities through the movement of inclined avoiding, rotary impurity scraping and inclined discharging of a scraping plate; the batching mechanism removes dust to prevent impurities from affecting melt performance. The crushing device adapts to different waste materials, airflow assists discharging to improve the efficiency, and the green production concept is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding waste plastic recycling, in particular to an injection molding equipment and process for plastic automobile trim part production. BACKGROUND

[0002] In the injection molding production of plastic automobile trim parts, the waste recovery process of traditional injection molding machines is complicated, and relies on offline processing, with low recovery efficiency and easy secondary pollution, insufficient utilization of plastic waste, and new material being injected into the mold after being melted once in the injection machine; the waste such as flash, sprue, and unqualified parts generated during the molding process must be collected after stopping, and then transported to the outside of the factory for crushing, cleaning, and drying before being reused as secondary material; due to multiple transportation, storage, and re-pelletizing links, the waste is easily contaminated by metal chips and dust, with low recycling rate, resulting in high additional energy consumption, logistics, and storage costs; intermittent recovery is difficult to match the continuous molding rhythm; and metal impurities mixed in cause mold damage and increase the defect rate of products. In the prior art, a small number of devices have added a material recovery mechanism, but the crushing mechanism in the existing material recovery mechanism has poor adaptability, resulting in uneven particles and affecting the subsequent melting quality; impurities are not removed completely, and metal impurities (such as mold wear debris) mixed in the waste are easy to enter the molding link, causing equipment damage or product defects. These problems restrict the economy, environmental protection, and quality stability of plastic trim part production. SUMMARY

[0003] Therefore, it is necessary to provide an injection molding equipment and process for plastic automobile trim part production in view of the problems in the prior art.

[0004] To solve the problems in the prior art, the technical scheme adopted by the present application is as follows: The present application provides an injection molding equipment for plastic automobile trim part production, which comprises an injection machine, an online recovery mechanism beside the injection machine, the injection machine comprising a main screw, a secondary screw, an injection housing, and a molding mold, the injection housing comprising a double-channel solution cavity, which is a new material main flow channel and a waste material return cavity respectively, the main screw being located in the new material main flow channel, and the secondary screw being located in the waste material return cavity, the two channels being Y-shaped at the end and converging at an angle of 30°, the converging position being located in the mixing section of the new material main flow channel, a batching mechanism being arranged on the waste material return cavity, the online recovery mechanism comprising a waste material conveying belt, a crushing mechanism, and a conveying device, the waste material conveying belt being located below the molding mold, the end of the waste material conveying belt being communicated with the inlet end of the crushing mechanism, a magnetic separation impurity removal device being arranged in the crushing mechanism, and the outlet end of the crushing mechanism being communicated with the batching mechanism through the conveying device.

[0005] Preferably, the magnetic separation and impurity removal device comprises an inclined feeding channel, a magnetic separation plate, a scraper, a storage chamber and a pushing device, the inclined feeding channel is laterally provided with an inclined slide, the pushing device is in transmission connection with the scraper, the scraper is rotatably installed above the magnetic separation plate, the scraper is fixedly installed on a transmission rod, the transmission rod is slidably arranged on the inclined slide, the inclined angles of the inclined slide and the magnetic separation plate are consistent with the inclined angle of the inclined feeding channel, the feeding end of the storage chamber is in communication with the sidewall of the top end of the inclined feeding channel, and the end of the inclined feeding channel is in communication with the feeding end of the crushing mechanism.

[0006] In order to ensure that the pushing device can drive the scraper to move, the pushing device comprises a linear driver, a rotary mounting seat and a hinged push rod, the linear driver is mounted on the outside of the crushing device through the rotary mounting seat, the output end of the linear driver is connected with the hinged push rod, one end of the transmission rod is hinged to the end of the hinged push rod away from the linear driver through a shaft joint sleeve, a rectangular limiting block is arranged in the inclined slide, the rectangular limiting block is hinged to the transmission rod, a horizontal limiting plate is fixedly installed on the rectangular limiting block, limiting sleeves are also fixedly installed at both ends of the transmission rod, two angle limiting plates arranged at an angle of 90° are fixedly installed on the limiting sleeves, springs and clamping blocks are arranged at both ends of the inclined slide, an avoiding groove is arranged on the inclined slide for avoiding the clamping block, the avoiding groove is arranged at the inclined direction of the inclined slide, the clamping block is slidably arranged in the avoiding groove, the two ends of the second spring are fixedly connected with the avoiding groove and the clamping block, and an elastic metal buckle is arranged on each angle limiting plate and in clamping connection with the end of the horizontal limiting plate.

[0007] On the one hand, the crushing device is a double-roller crushing device, and the crushing device comprises a crushing chamber, a crushing driver and crushing rollers arranged in the crushing chamber, the crushing driver is in transmission connection with the crushing rollers, and the crushing chamber is in communication with the batching mechanism through a pneumatic conveying mechanism below.

[0008] On the other hand, the crushing device is a blade crushing device, and the crushing device comprises a crushing cylinder and horizontal blades and inclined blades arranged in the crushing cylinder, the horizontal blades are below the inclined blades, the inclined blades are at an angle with the horizontal plane, the bottom of the crushing cylinder is provided with a blowing channel, the upper half of the crushing cylinder is provided with an air-exhausting discharging channel, the horizontal blades can rotate around the axis of the crushing cylinder, and the inclined blades can rotate around the axis of the crushing cylinder while rotating around the inclined direction of the inclined blades.

[0009] Preferably, the crushing device further comprises a first rotating shaft, a rotating sleeve, a rotating driving device and a rotation transmission device, the rotating driving device is installed at the top end of the crushing cylinder, the first rotating shaft is vertically installed in the crushing cylinder, the rotating driving device is in transmission connection with the first rotating shaft, the rotating sleeve is sleeved outside the first rotating shaft, the rotating driving device is connected with the rotating sleeve, the horizontal blades are fixedly installed on the first rotating shaft, and the inclined blades are rotatably installed at the bottom of the rotating sleeve.

[0010] Preferably, the rotary driving device comprises a rotary driver, a second rotating shaft, a first speed reduction gear set and a second speed reduction gear set, the rotary driver is fixedly installed at the top end of the crushing cylinder, the output end of the rotary driver is fixedly connected with the top end of the first rotating shaft, the second rotating shaft is located beside the top end of the first rotating shaft, the first speed reduction gear set is in transmission connection with the first rotating shaft and the second rotating shaft respectively, and the second speed reduction gear set is in transmission connection with the second rotating shaft and the rotating sleeve respectively.

[0011] Preferably, the rotary driving device comprises a rotary driver, a second rotating shaft, a first speed reduction gear set and a second speed reduction gear set, the rotary driver is fixedly installed at the top end of the crushing cylinder, the output end of the rotary driver is fixedly connected with the top end of the first rotating shaft, the second rotating shaft is located beside the top end of the first rotating shaft, the first speed reduction gear set is in transmission connection with the first rotating shaft and the second rotating shaft respectively, and the second speed reduction gear set is in transmission connection with the second rotating shaft and the rotating sleeve respectively.

[0012] Preferably, the feeding mechanism comprises a dust separator, a second material cylinder and a feeding proportioning valve, the waste feeding pipeline is arranged on the discharging end of the crushing mechanism and is in communication with the dust separator, and the dust separator and the second material cylinder are arranged at two feeding ends of the feeding proportioning valve respectively.

[0013] Also provided is an injection molding process for producing plastic automobile ornaments, comprising the following steps: S1: new material is injected into the main screw to melt, the molding mold produces automobile interior ornaments, and waste, nozzle material and the like fall into the waste conveying belt; S2: the waste is crushed by the crushing mechanism, impurities are removed by magnetic separation, and the crushed waste is separated from the dust and proportioned into the feeding mechanism with new material; S3: the waste is melted by the auxiliary screw and converges with the new material of the main screw in the mixing section; S4: the mixed melt is injected into the mold to form and complete the cycle.

[0014] The beneficial effects of the present application compared with the prior art are: 1. The present application realizes the on-line recycling and crushing of waste materials such as nozzle materials generated during production, and the reuse of the waste materials with new materials through the design of a double-channel melt cavity composed of a new material main flow channel and a waste material return cavity and a 30° Y-shaped converging structure, and the on-line melting and mixing of new materials and recycled waste materials, thereby improving the utilization rate of plastic waste materials, reducing raw material costs, reducing solid waste emissions and meeting the green production concept.

[0015] 2. The magnetic separation and impurity removal device removes metal impurities in waste materials efficiently through the movement trajectory of avoiding by tilting the scraper, rotating 90° vertically to remove impurities, and discharging along the tilting direction to reset and deflect back to the tilt. The impurities are completely removed without residues. The dust separator of the batching mechanism further removes dust generated during crushing to avoid the influence of impurities and dust on the performance of the melt, significantly reducing equipment failures and product defect rates caused by impurities.

[0016] 3. The waste plastic can be crushed online, and in the second embodiment, multidirectional cutting is realized to adapt to plastic waste of different shapes and hardnesses (such as curved decorative parts and nozzle materials), improve the uniformity of the crushed particle size, and accelerate the discharge of qualified particles through the airflow design of bottom blowing and top suction to reduce retention and over-crushing, thereby improving the crushing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a perspective view of an injection molding equipment for plastic automotive trim part production; Figure 2 FIG. 2 is a top view of the injection molding equipment for plastic automotive trim part production; Figure 3 FIG. 3 is a perspective view of an online recycling mechanism in the first embodiment of the injection molding equipment for plastic automotive trim part production; Figure 4 FIG. 4 is a perspective view of a magnetic separation and impurity removal device in the injection molding equipment for plastic automotive trim part production Figure 1 ; Figure 5 FIG. 5 is a perspective view of a magnetic separation and impurity removal device in the injection molding equipment for plastic automotive trim part production Figure 2 ; Figure 6 FIG. 6 is a partial perspective view of a magnetic separation and impurity removal device in the injection molding equipment for plastic automotive trim part production; Figure 7 FIG. 7 is a perspective view of a crushing device in the second embodiment of the injection molding equipment for plastic automotive trim part production; Figure 8 FIG. 8 is a partial perspective view of the second embodiment of the injection molding equipment for plastic automotive trim part production; Figure 9 FIG. 9 is an exploded perspective view of a self-rotation transmission device in the second embodiment of the injection molding equipment for plastic automotive trim part production; Figure 10 FIG. 10 is an exploded perspective view of a rotary drive device in the second embodiment of the injection molding equipment for plastic automotive trim part production; Figure 11 FIG. 11 is a perspective view of a batching mechanism in the injection molding equipment for plastic automotive trim part production.

[0018] Reference signs in the figures are: 1, injection machine; 2, online recycling mechanism; 3, injection housing; 4, molding die; 5, main flow channel of new material; 6, waste material return cavity; 7, waste material conveying belt; 8, magnetic separation impurity removal device; 9, inclined feeding channel; 10, magnetic separation plate; 11, scraper; 12, storage chamber; 13, inclined slide; 14, transmission rod; 15, linear driver; 16, rotating mounting seat; 17, hinged push rod; 18, shaft adapter; 19, rectangular limiting block; 20, horizontal limiting plate; 21, limiting sleeve; 22, angle limiting plate; 23, spring; 24, clamping block; 25, avoidance groove; 26, elastic metal buckle; 27, crushing chamber; 28, crushing driver; 29, crushing roller; 30, pneumatic conveying mechanism; 31, crushing cylinder; 32, horizontal blade; 33, inclined blade; 34, air blowing channel; 35, air exhaust discharge channel; 36, first rotating shaft; 37, rotating sleeve; 38, rotary driver; 39, second rotating shaft; 40, first speed reduction gear set; 41, second speed reduction gear set; 42, shaft adapter ring; 43, fixed ring; 44, limiting sleeve; 45, rotating ring; 46, transmission ball head; 47, arc-shaped transmission tooth; 48, dust separator; 49, second material cylinder; 50, feeding proportioning valve; 51, waste material supply pipeline. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below in combination with the drawings and specific embodiments.

[0020] As Figures 1-11 shown in the drawings, the injection molding equipment for plastic automobile ornament production comprises an injection machine 1, an online recycling mechanism 2 arranged beside the injection machine 1, a main screw, a secondary screw, an injection housing 3 and a molding die 4, a double-channel melt cavity arranged in the injection housing 3 and respectively serving as a main flow channel 5 of new material and a waste material return cavity 6, the main screw being located in the main flow channel 5 of new material and the secondary screw being located in the waste material return cavity 6, the two channels being converged in a 30° Y shape at the end, the converging position being located in the mixing section of the main flow channel 5 of new material, a proportioning mechanism being arranged on the waste material return cavity 6, the online recycling mechanism 2 comprising a waste material conveying belt 7, a crushing mechanism and a conveying device, the waste material conveying belt 7 being located below the molding die 4, the end of the waste material conveying belt 7 being communicated with the feeding end of the crushing mechanism, the crushing mechanism being provided with a magnetic separation impurity removal device 8, and the discharging end of the crushing mechanism being communicated with the proportioning mechanism through the conveying device.

[0021] The device realizes injection molding of plastic automobile ornaments by injection machine 1, and realizes waste recycling by combining with online recycling mechanism 2. New material main runner 5 (main screw) and waste return cavity 6 (auxiliary screw) are arranged in injection housing 3 of injection machine 1. New material is plasticized and melted under the action of the main screw and is conveyed along new material main runner 5. The waste generated by molding mold 4 is sent to the crushing mechanism for crushing, and after magnetic separation and impurity removal, it is sent to the batching mechanism through the conveying device. The waste after batching is melted under the action of the auxiliary screw and is conveyed along the waste return cavity 6. The two channels are converged to the mixing section at the end in the form of 30° Y type, so as to realize the uniform mixing of new material and recycled waste and then injection into the mold for molding. The double-channel solution cavity and the Y-type convergence structure realize the online fusion of new material and recycled waste, greatly improve the utilization rate of plastic waste, and reduce the production cost. The online recycling mechanism 2 operates in a closed loop, reduces the waste transportation and storage links, and improves the production continuity. The magnetic separation and impurity removal device 8 removes the metal impurities in the waste in advance, so as to ensure the quality of the molded products.

[0022] The magnetic separation and impurity removal device 8 comprises an inclined feeding channel 9, a magnetic separation plate 10, a scraper 11, a storage chamber 12 and a pushing device. The inclined feeding channel 9 is laterally provided with an inclined slide 13. The pushing device is in transmission connection with the scraper 11. The scraper 11 is rotatably installed above the magnetic separation plate 10. The scraper 11 is fixedly installed on a transmission rod 14. The transmission rod 14 is slidably arranged on the inclined slide 13. The inclined angles of the inclined slide 13 and the magnetic separation plate 10 are consistent with the inclined angle of the inclined feeding channel 9. The inlet end of the storage chamber 12 is in communication with the side wall of the top end of the inclined feeding channel 9. The end of the inclined feeding channel 9 is in communication with the inlet end of the crushing mechanism.

[0023] When the magnetic separation and impurity removal device 8 works, the crushed waste slides along the inclined feeding channel 9. The magnetic separation plate 10 generates a magnetic field to attract the metal impurities in the waste. The initial state of the scraper 11 is inclined, which is consistent with the inclined angle of the magnetic separation plate 10, so as to avoid interfering with the conveying of the waste. After the pushing device is started, it first drives the scraper 11 to rotate 90° around the transmission rod 14, so that the scraper 11 changes from the inclined state to the state perpendicular to the surface of the magnetic separation plate 10, and ensures that the edge of the scraper 11 closely contacts the magnetic separation plate 10. Then the pushing device drives the scraper 11 to displace along the inclined slide 13 in the inclined direction of the magnetic separation plate 10, so as to completely scrape off the attracted metal impurities to the storage chamber 12 to complete the discharging. After the discharging is completed, the pushing device starts to reset: it first drives the scraper 11 to reverse 90°, so that the scraper 11 returns to the initial state consistent with the inclined angle of the magnetic separation plate 10, and then drives the scraper 11 to retreat to the original position along the inclined slide 13, so as to avoid the scraper 11 contacting the magnetic separation plate 10 to bring back the residual impurities during the resetting process, and to avoid blocking the feeding process by avoiding the waste during the subsequent feeding process. The scraper 11 can scrape off the metal impurities attracted on the magnetic separation plate 10. When the scraper 11 is reset, it first changes to the inclined state and then retreats, which reduces the contact area with the magnetic separation plate 10 and avoids bringing back the unscraped impurities to the waste flow, so as to ensure the purity of the waste after the impurities are removed.

[0024] To ensure the movement of the scraper 11 driven by the pushing device, the pushing device includes a linear actuator 15, a rotating mounting base 16, and a hinged push rod 17. The linear actuator 15 is mounted on the outside of the crushing device via the rotating mounting base 16. The output end of the linear actuator 15 is connected to the hinged push rod 17. One end of the transmission rod 14 is hinged to the end of the hinged push rod 17 away from the linear actuator 15 via a shaft sleeve 18. A rectangular limiting block 19 is provided in the inclined slide 13. The rectangular limiting block 19 is hinged to the transmission rod 14, and a horizontal limiting plate 20 is fixedly installed on the rectangular limiting block 19. Limit sleeves 21 are fixedly installed at both ends of the rod 14. Two angle limit plates 22 set at 90° are fixedly installed on the limit sleeves 21. Springs 23 and locking blocks 24 are provided at both ends of the inclined slide 13. The inclined slide 13 is provided with a clearance groove 25 for avoiding the locking blocks 24. The clearance groove 25 is in the same direction as the inclined slide 13. The locking blocks 24 are slidably disposed in the clearance groove 25. The two ends of the second spring 23 are fixedly connected to the clearance groove 25 and the locking blocks 24 respectively. Each angle limit plate 22 is provided with an elastic metal buckle 26 that engages with the end of the horizontal limit plate 20.

[0025] like Figures 4-6 The output end of the linear actuator 15 shown drives the transmission rod 14 to move via the hinged push rod 17. The transmission rod 14 slides along the inclined slide rail 13. The rectangular limit block 19 guides and limits the displacement of the transmission rod 14. The limit sleeves 21 at both ends of the transmission rod 14 and the angle limit plate 22 control the rotation angle of the scraper 11. When it is in contact with the horizontal limit plate 20, it can limit the rotation angle of the transmission rod 14, ensuring that the scraper 11 can both stick to the magnetic separation plate 10 to scrape impurities when sliding and lift up during the return trip to avoid bringing back impurities.

[0026] In the initial state, the scraper 11 is arranged obliquely, one of the angle limiting plates 22 on the scraper 11 is in abutment with the horizontal limiting plate 20 arranged on the rectangular limiting block 19, the elastic metal buckle 26 on the angle limiting plate 22 is in clamping connection with the horizontal limiting plate 20, and at this time, the clamping block 24 is in a pop-up state, used for blocking and limiting the rectangular limiting block 19, when the linear driver 15 outputs, due to the blocking of the clamping block 24, the transmission rod 14 rotates by 90 degrees after overcoming the clamping connection between the elastic metal buckle 26 and the horizontal limiting plate 20, so that the transmission rod 14 drives the scraper 11 to rotate by 90 degrees to a state perpendicular to the magnetic separation plate 10, at this time, the other angle limiting plate 22 is in abutment with the horizontal limiting plate 20, limiting the deflection angle, and the elastic metal buckle 26 on the angle limiting plate 22 is locked with the other end of the horizontal limiting plate 20, so as to realize a new angle locking relationship and increase the driving force, the rectangular limiting block 19 overcomes the blocking of the clamping block 24, forcing the clamping block 24 to be compressed downwardly to displace the second spring 23, and the clamping block 24 is pressed into the avoiding groove 25 for avoiding. Then, the linear driver 15 drives the scraper 11 and the transmission rod 14 to displace synchronously, so as to realize the scraping work of the scraper 11 on the magnetic separation plate 10. When resetting, the other spring 23 and the clamping block 24 are blocked (equivalent to the previous one during pushing, so the angle of the scraper 11 does not change), forcing the elastic metal buckle 26 clamped with the horizontal limiting plate 20 to be unlocked, the transmission rod 14 is rotated by 90 degrees under the action of the pulling force of the hinged push rod 17, until the scraper 11 is parallel to the magnetic separation plate 10, and then is reset along the inclined slide 13, realizing the resetting function.

[0027] As Figures 1-6 shown in the first embodiment of the application, the crushing device is a double-roller crushing device, which comprises a crushing chamber 27, a crushing driver 28 and a crushing roller 29 arranged in the crushing chamber 27, the crushing driver 28 is in transmission connection with the crushing roller 29, and the lower part of the crushing chamber 27 is communicated with a batching mechanism through a pneumatic conveying mechanism 30.

[0028] The double-roller crushing device is used for crushing plastic waste. The crushing driver 28 drives the crushing roller 29 in the crushing chamber 27 to rotate relatively, and the waste is crushed by being extruded and sheared by the double rollers after entering the crushing chamber 27; the crushed waste is conveyed through the pneumatic conveying mechanism 30 (such as an air flow pipeline) below the crushing chamber 27, and the waste particles are sent to the batching mechanism by means of air flow power. The crushing function of the waste is realized, and the waste particles are transported back.

[0029] In Embodiment 1, the squeezing and shearing action of the relative rotation of the two rollers may create dead corners for crushing irregularly shaped (such as those with protrusions or holes) automotive trim waste, resulting in some waste particles being too large or not being crushed thoroughly. Therefore, Embodiment 2 of the present invention is proposed. The crushing device is a blade crushing device. The crushing device includes a crushing cylinder 31 and horizontal blades 32 and inclined blades 33, both of which are arranged inside the crushing cylinder 31. The horizontal blades 32 are located below the inclined blades 33, and the inclined blades 33 form a certain angle with the horizontal plane. The bottom of the crushing cylinder 31 is provided with a blowing channel 34, and the upper half of the crushing cylinder 31 is provided with a suction discharge channel 35. The horizontal blades 32 can rotate around the axis of the crushing cylinder 31, and the inclined blades 33 rotate around their own inclined direction and can also revolve around the axis of the crushing cylinder 31.

[0030] Compared to Example 1, such as Figures 7-10 In the second embodiment shown, the crushing is more uniform and fine, the separation and discharge are more efficient, and the adaptability is stronger. Through the combined motion of the horizontal blade 32 rotating around the axis and the inclined blade 33 rotating on its own axis and revolving around the center, the plastic waste is cut and crushed in multiple directions and angles. This avoids the problem of insufficient crushing in some areas that may be caused by the extrusion and shearing that may be encountered in dual-roll crushers. It can adapt to different shapes (such as curved surfaces and thin walls) of automotive trim waste and sprue generated during injection molding, etc., and the crushed particle size is more uniform. The bottom of the crushing cylinder 31 is equipped with a blowing channel 34 and the upper part is equipped with a suction discharge channel 35. The airflow can help separate the crushed material of qualified particle size and discharge the qualified waste in time, reduce the retention of over-crushed or uncrushed waste, and improve the crushing efficiency. The inclined angle design and combined motion mode of the inclined blade 33 can handle plastic waste of different hardness and toughness, reduce the risk of waste wrapping around the blade, and reduce the probability of equipment jamming.

[0031] The blade crushing device achieves fine crushing of waste materials through the movement of multiple blades. Inside the crushing cylinder 31, the horizontal blade 32 rotates around its axis to horizontally cut the waste material; the inclined blade 33 rotates on its own axis and revolves around the axis of the crushing cylinder 31, increasing the vertical cutting range. This allows for efficient crushing of waste materials of different shapes and with different feed angles, avoiding material jamming and slow crushing of larger but substandard particles. During crushing, the air blowing channel 34 blows air from the bottom, and the exhaust channel 35 draws air from the upper part, creating an airflow that carries the crushed, qualified waste particles out of the crushing cylinder 31.

[0032] The crushing device further comprises a first rotating shaft 36, a rotating sleeve 37, a rotating driving device and a self-rotating transmission device, the rotating driving device is installed at the top end of the crushing cylinder 31, the first rotating shaft 36 is vertically installed in the crushing cylinder 31, the rotating driving device is in transmission connection with the first rotating shaft 36, the rotating sleeve 37 is sleeved outside the first rotating shaft 36, the rotating driving device is connected with the rotating sleeve 37, the horizontal blade 32 is fixedly installed on the first rotating shaft 36, and the inclined blade 33 is rotatably installed at the bottom of the rotating sleeve 37.

[0033] The rotating driving device drives the first rotating shaft 36 and the rotating sleeve 37 to rotate, when the first rotating shaft 36 rotates, the horizontal blade 32 rotates with the first rotating shaft 36 to realize horizontal cutting, and when the rotating sleeve 37 rotates, the inclined blade 33 revolves around the axis of the crushing cylinder 31, meanwhile, the self-rotating transmission device drives the inclined blade 33 to rotate around the inclined direction of the inclined blade 33 to realize compound motion.

[0034] The rotating driving device comprises a rotating driver 38, a second rotating shaft 39, a first speed reduction gear set 40 and a second speed reduction gear set 41, the rotating driver 38 is fixedly installed at the top end of the crushing cylinder 31, the output end of the rotating driver 38 is fixedly connected with the top end of the first rotating shaft 36, the second rotating shaft 39 is located beside the top end of the first rotating shaft 36, the first speed reduction gear set 40 is in transmission connection with the first rotating shaft 36 and the second rotating shaft 39 respectively, and the second speed reduction gear set 41 is in transmission connection with the second rotating shaft 39 and the rotating sleeve 37 respectively.

[0035] The rotating driver 38 drives the first rotating shaft 36 to rotate and drives the horizontal blade 32 to rotate, the first speed reduction gear set 40 transmits the power of the first rotating shaft 36 to the second rotating shaft 39, and the second speed reduction gear set 41 transmits the power of the second rotating shaft 39 to the rotating sleeve 37 to drive the inclined blade 33 to revolve at a reduced speed.

[0036] The self-rotating transmission device comprises a shaft joint ring 42, a fixed ring 43, a limiting sleeve 44 and a rotating ring 45, the shaft joint ring 42 is obliquely installed on the rotating sleeve 37, the inclined blade 33 is fixedly installed on the shaft joint ring 42, the oblique angle of the shaft joint ring 42 is consistent with that of the inclined blade 33, the shaft joint ring 42 is internally provided with ring teeth, the transmission ball head 46 is fixedly installed on the first rotating shaft 36, the arc-shaped transmission teeth 47 are arranged on the outer surface of the transmission ball head 46, the shaft joint ring 42 is in mesh with the transmission ball head 46 through the ring teeth and the arc-shaped transmission teeth 47, the fixed ring 43 is fixedly installed on the first rotating shaft 36, the rotating ring 45 is fixedly installed on the rotating sleeve 37, the rotating ring 45 is installed in the limiting sleeve 44, and the limiting sleeve 44 is detachably connected with the fixed ring 43.

[0037] The shaft connecting ring 42 is obliquely installed on the rotating sleeve 37, and the oblique blade 33 is fixed thereon and revolves with the rotating sleeve 37; the transmission ball head 46 on the first rotating shaft 36 is engaged with the ring teeth of the shaft connecting ring 42 through the arc-shaped transmission teeth 47, and when the first rotating shaft 36 rotates, the shaft connecting ring 42 and the oblique blade 33 are driven to rotate around the oblique direction of the shaft connecting ring 42 through the engagement of the arc-shaped transmission teeth 47 and the ring teeth. The fixed ring 43, the rotating ring 45 and the limiting sleeve 44 constrain the position of the shaft connecting ring 42, and ensure stable engagement.

[0038] As Figure 11 The batching mechanism includes a dust separator 48, a second barrel 49 and a material feeding proportioning valve 50, and a waste material feeding pipeline 51 is arranged on the discharge end of the crushing mechanism and communicates with the dust separator 48. The dust separator 48 and the second barrel 49 are respectively arranged at two material feeding ends of the material feeding proportioning valve 50, and the material feeding end of the material feeding proportioning valve 50 communicates with the waste material return cavity 6.

[0039] The batching mechanism is used for controlling the mixing proportion of the waste material and the new material. The crushed waste material enters the dust separator 48 through the waste material feeding pipeline 51 to remove the dust generated in the crushing process. The purified waste material and the new material in the second barrel 49 enter two material feeding ends of the material feeding proportioning valve 50 respectively, the material feeding proportioning valve 50 adjusts the flow of the two materials according to the preset proportion, and the materials are delivered to the waste material return cavity 6 in proportion to be mixed with the molten material delivered by the auxiliary screw. The dust separator 48 reduces the dust in the waste material to avoid affecting the quality of the molten material. The material feeding proportioning valve 50 precisely controls the mixing proportion of the waste material, ensures the stable performance of the molten material after the recycled material is mixed with the new material, and maximizes the utilization of the waste material while guaranteeing the product quality.

[0040] An injection molding process for producing plastic automobile trim parts, comprising the following steps: S1: The new material is injected into the main screw to melt, and the automobile interior trim part is produced by the molding mold 4, and the waste material, nozzle material and the like fall into the waste material conveying belt 7; S2: The waste material is crushed by the crushing mechanism, and the impurities are removed by magnetic separation. The crushed waste material is separated from the dust, and the waste material and the new material enter the batching mechanism in proportion; S3: The waste material is melted by the auxiliary screw, and the new material of the main screw is converged in the mixing section; S4: The mixed molten material is injected into the mold to form and complete the cycle.

[0041] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An injection molding apparatus for the production of plastic automotive trim parts, characterized in that The utility model relates to an injection machine with online recovery mechanism, which comprises an injection machine (1) and an online recovery mechanism (2) beside the injection machine (1), wherein the injection machine (1) comprises a main screw rod, a secondary screw rod, an injection housing (3) and a forming die (4), the injection housing (3) is internally provided with a double-channel melt cavity, which is respectively a new material main flow channel (5) and a waste material return cavity (6), the main screw rod is located in the new material main flow channel (5), the secondary screw rod is located in the waste material return cavity (6), the two channels are converged in a 30° Y shape at the end, the convergence position is located in the mixing section of the new material main flow channel (5), the waste material return cavity (6) is provided with a batching mechanism, the online recovery mechanism (2) comprises a waste material conveying belt (7), a crushing mechanism and a transmission device, the waste material conveying belt (7) is located below the forming die (4), the end of the waste material conveying belt (7) is communicated with the feeding end of the crushing mechanism, the crushing mechanism is internally provided with a magnetic separation impurity removal device (8), and the discharging end of the crushing mechanism is communicated with the batching mechanism through the transmission device.

2. An injection molding apparatus for producing plastic automotive trim parts as defined in claim 1, wherein The magnetic separation impurity removal device (8) comprises an inclined feeding channel (9), a magnetic selection plate (10), a scraper (11), a storage chamber (12) and a pushing device, the inclined feeding channel (9) is laterally provided with an inclined slide (13), the pushing device is in transmission connection with the scraper (11), the scraper (11) is rotatably installed above the magnetic selection plate (10), the scraper (11) is fixedly installed on a transmission rod (14), the transmission rod (14) is slidably arranged on the inclined slide (13), the inclined angles of the inclined slide (13) and the magnetic selection plate (10) are consistent with the inclined angle of the inclined feeding channel (9), the feeding end of the storage chamber (12) is communicated with the side wall of the top end of the inclined feeding channel (9), and the end of the inclined feeding channel (9) is communicated with the feeding end of the crushing mechanism.

3. An injection molding apparatus for producing plastic automotive trim parts as defined in claim 2, wherein The pushing device comprises a linear actuator (15), a rotary mounting base (16) and a hinged push rod (17), the linear actuator (15) is mounted on the outside of the crushing device through the rotary mounting base (16), the output end of the linear actuator (15) is connected with the hinged push rod (17), one end of the transmission rod (14) is hingedly connected with the end of the hinged push rod (17) away from the linear actuator (15) through a shaft joint sleeve (18), the inclined slide (13) is internally provided with a rectangular limiting block (19), the rectangular limiting block (19) is hingedly connected with the transmission rod (14), a horizontal limiting plate (20) is fixedly installed on the rectangular limiting block (19), the two ends of the transmission rod (14) are also respectively fixedly installed with limiting sleeves (21), two angle limiting plates (22) arranged at an angle of 90° are fixedly installed on the limiting sleeves (21), springs (23) and clamping blocks (24) are arranged at the two ends of the inclined slide (13), the inclined slide (13) is provided with an avoiding groove (25) for avoiding the clamping block (24), the avoiding groove (25) is arranged at the inclined direction of the inclined slide (13), the clamping block (24) is slidably arranged in the avoiding groove (25), the two ends of the second spring (23) are fixedly connected with the avoiding groove (25) and the clamping block (24), and one elastic metal buckle (26) is arranged on each angle limiting plate (22) and is clamped with the end of the horizontal limiting plate (20).

4. An injection molding apparatus for producing plastic automotive trim parts as defined in claim 1, wherein The crushing device is a double-roller crushing device, which comprises a crushing chamber (27), a crushing driver (28) and a crushing roller (29) arranged in the crushing chamber (27), the crushing driver (28) is in transmission connection with the crushing roller (29), and the crushing chamber (27) is communicated with the batching mechanism through a pneumatic conveying mechanism (30) below.

5. An injection molding apparatus for producing plastic automotive trim parts as defined in claim 1, wherein, The crushing device is a blade crushing device, which comprises a crushing cylinder (31) and horizontal blades (32) and inclined blades (33) arranged in the crushing cylinder (31), the horizontal blades (32) are located below the inclined blades (33), the inclined blades (33) form a certain angle with the horizontal plane, the bottom of the crushing cylinder (31) is provided with a blowing channel (34), the upper half of the crushing cylinder (31) is provided with an air exhaust and discharging channel (35), the horizontal blades (32) can rotate around the axis of the crushing cylinder (31), and the inclined blades (33) can rotate around the axis of the crushing cylinder (31) and can also revolve around the axis of the crushing cylinder (31).

6. An injection molding apparatus for producing plastic automotive trim parts as defined in claim 5, wherein The crushing device further comprises a first rotating shaft (36), a rotating sleeve (37), a rotating driving device and a self-rotating transmission device, the rotating driving device is installed at the top end of the crushing cylinder (31), the first rotating shaft (36) is vertically installed in the crushing cylinder (31), the rotating driving device is in transmission connection with the first rotating shaft (36), the rotating sleeve (37) is sleeved outside the first rotating shaft (36), the rotating driving device is connected with the rotating sleeve (37), the horizontal blades (32) are fixedly installed on the first rotating shaft (36), and the inclined blades (33) are rotatably installed at the bottom of the rotating sleeve (37).

7. An injection molding apparatus for producing plastic automotive trim parts as defined in claim 6, wherein The rotating driving device comprises a rotating driver (38), a second rotating shaft (39), a first speed reduction gear set (40) and a second speed reduction gear set (41), the rotating driver (38) is fixedly installed at the top end of the crushing cylinder (31), the output end of the rotating driver (38) is fixedly connected with the top end of the first rotating shaft (36), the second rotating shaft (39) is located beside the top end of the first rotating shaft (36), the first speed reduction gear set (40) is in transmission connection with the first rotating shaft (36) and the second rotating shaft (39) respectively, and the second speed reduction gear set (41) is in transmission connection with the second rotating shaft (39) and the rotating sleeve (37) respectively.

8. An injection molding apparatus for producing plastic automotive trim parts as defined in claim 7, wherein The self-rotating transmission device comprises a shaft joint ring (42), a fixed ring (43), a limiting sleeve (44) and a rotating ring (45), the shaft joint ring (42) is obliquely installed on the rotating sleeve (37), the inclined blades (33) are fixedly installed on the shaft joint ring (42), the oblique angle of the shaft joint ring (42) is consistent with that of the inclined blades (33), the shaft joint ring (42) is internally provided with ring teeth, a transmission ball head (46) is fixedly installed on the first rotating shaft (36), an arc-shaped transmission tooth (47) is arranged on the outer surface of the transmission ball head (46), the shaft joint ring (42) is in meshing connection with the transmission ball head (46) through the ring teeth and the arc-shaped transmission tooth (47), the fixed ring (43) is fixedly installed on the first rotating shaft (36), the rotating ring (45) is fixedly installed on the rotating sleeve (37), the rotating ring (45) is installed in the limiting sleeve (44), and the limiting sleeve (44) is detachably connected with the fixed ring (43).

9. An injection molding apparatus for producing plastic automotive trim parts as defined in claim 1, wherein, The dosing mechanism comprises a dust separator (48), a second barrel (49) and a material feeding proportional valve (50), a waste material feeding pipe (51) is arranged at the discharging end of the crushing mechanism, the waste material feeding pipe is communicated with the dust separator (48), the dust separator (48) and the second barrel (49) are respectively arranged at two material feeding ends of the material feeding proportional valve (50), and the discharging end of the material feeding proportional valve (50) is communicated with the waste material return cavity (6).

10. An injection molding process for producing plastic automotive trim parts, applied to the injection molding apparatus for producing plastic automotive trim parts as claimed in claims 1-9, characterized in that, The method comprises the following steps: S1: new material is injected into the main screw to melt, the forming mold (4) produces an automobile interior part, and waste material and nozzle material fall into the waste material conveying belt (7); S2: the waste material is crushed by the crushing mechanism, impurities are removed by magnetic separation, the crushed waste material is separated from the dust, and the waste material and the new material enter the dosing mechanism in proportion; S3: the waste material is melted in the auxiliary screw, and the waste material and the new material of the main screw converge in the mixing section; S4: the mixed melt is injected into the mold to form, and the cycle is completed.

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