Pet injection molding machine

Abstract

The application discloses a PET injection molding machine and relates to the field of PET injection molding equipment.The machine body is internally provided with an injection molding mechanism, a discharging conveying frame, a weighing and sorting mechanism and a visual scanning mechanism.The discharging conveying frame guides the molded parts to the weighing platform, the weight sensor collects the weight of each part, the electric push rod drives the push plate to send the qualified products and the defective products into the corresponding collection boxes respectively, the monitoring control center starts the lateral movement of the binocular camera when the weight anomaly continuously occurs, the molded parts passing through are scanned from multiple angles and the detection information is transmitted to the processing and display module, the machine body top is provided with a residual heat insulation mechanism and an exhaust heat dissipation mechanism, the heat guide pipe introduces part of the heat in the machine body into the insulation sleeve which is sleeved outside the injection barrel, the auxiliary heater supplements heat during the shutdown detection, and the exhaust fan in the exhaust hood exhausts the remaining hot air.The application can connect the weighing and sorting, continuous abnormal triggering scanning, defect positioning and shutdown insulation into a continuous process.

Description

Technical Field

[0001] This invention relates to the field of PET injection molding equipment, specifically PET injection molding machines. Background Technology

[0002] A PET injection molding machine is a production device that heats and plasticizes dried PET raw materials, and uses an injection mechanism to force the molten material into a mold cavity. After holding pressure, cooling, and ejection, a preform or other PET product is formed. PET materials are quite sensitive to temperature, injection pressure, and mold condition. When the injection volume fluctuates slightly, the runner is partially blocked, or the condition of a single cavity is abnormal, the weight and local shape of the molded part may change accordingly.

[0003] Existing equipment typically sends molded parts directly to subsequent conveying or centralized collection stages after they leave the mold. Individual part weight and shape information are separated during production. Weight deviations only reflect changes in the molding state but are insufficient to pinpoint the location of anomalies such as material shortages, flash, or localized collapses within the molded part. When the same mold continuously produces parts with substandard weights, the equipment struggles to correlate these continuous weight changes with specific mold locations, resulting in a lack of continuous data to support fault diagnosis.

[0004] If a comprehensive visual scan is continuously performed as each molded part passes through, the scanning mechanism, data processing unit, and storage unit would need to operate under high load for extended periods, potentially conflicting with the faster output cycle. Furthermore, weight detection alone cannot pinpoint defect locations. Therefore, a triggering relationship needs to be established between the weighing results and the visual scanning action, allowing the visual scan to focus on the continuous abnormality phase and ensuring a clear conveying order for the molded parts during weighing, sorting, and scanning.

[0005] Furthermore, after a series of anomalies, it is usually necessary to briefly stop the injection molding process for inspection. During the shutdown, the injection barrel loses continuous shear heat and material flow. As the temperature of the molten PET near the discharge end drops, its viscosity increases rapidly, which can lead to material stagnation at the barrel or nozzle in severe cases. If all the high-temperature gases inside the machine are directly discharged, it will result in the loss of usable heat. Therefore, it is also necessary to coordinate waste heat drainage, supplementary heating, and machine body heat dissipation to maintain the temperature of the injection barrel while avoiding excessive heat accumulation inside the machine. Summary of the Invention

[0006] This invention provides a PET injection molding machine that solves the problems of the independent weight detection, shape scanning and sorting processes of existing PET molded parts, the difficulty in triggering targeted scanning and locating defects due to continuous weight abnormalities, and the easy cooling and thickening of the material in the injection barrel during equipment shutdown for inspection.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The PET injection molding machine includes a machine body. Inside the machine body, starting from the injection molding mechanism, a material conveyor, a weighing and sorting mechanism, and a vision scanning mechanism are arranged. After the molded parts are ejected from the injection molding mechanism, they enter the weighing area along the material conveyor ramp. The weighing results and scanning status are summarized by the monitoring and control center and output on the processing and display module. The waste heat preservation mechanism at the top of the machine body is located near the injection barrel, and the exhaust heat dissipation mechanism is located in the concentrated hot air area at the top of the machine body. The weighing and sorting mechanism uses a support base to support the weight sensor and the weighing platform. An electric push rod drives the pusher plate to move back and forth on one side of the weighing platform. The qualified product collection box and the defective product collection box are arranged on both sides of the support base, so that the molded parts form a continuous path from ejection, conveying, weighing to classification and collection. It also establishes a unified product order for continuous weight data and subsequent scanning information, so that the weight, image, and sorting destination generated in the same molding cycle can be cross-checked.

[0008] As a preferred technical solution of the present invention, the pusher plate is arranged longitudinally along the weighing platform, and its reciprocating path spans the openings of the two collection boxes. When the electric push rod extends or retracts, it guides the molded parts to different sides respectively. The two box openings are close to the discharge edge of the weighing platform, which shortens the free fall distance of the sorted parts after leaving the platform and avoids interference between the next molded part and the previous molded part when the latter enters. After the collection box is full, it can be pulled out from both sides of the bearing seat without occupying the space above the weighing platform.

[0009] In a preferred embodiment of the present invention, the visual scanning mechanism is mounted on the material conveying path via two parallel transverse guide rails. A drive motor rotates a transmission screw, and one end of the moving slide moves laterally along the transmission screw, while the other end is restricted from rotation and oscillation by a guide rod. A binocular camera moves with the moving slide from one side of the molded part to the other. The binocular camera acquires the contour and surface information of the molded part at different transverse positions. The monitoring and control center associates multiple images of the same molded part with corresponding weight records, which can identify the location of local missing material, flash, or dents in the molded part. It can also determine whether the abnormality is concentrated in the same mold position based on the repetitive areas of continuous abnormal images, and can use the transverse coordinates of the moving slide as auxiliary positioning data for the image defect location.

[0010] As a preferred embodiment of the present invention, the waste heat preservation mechanism connects the hot air area at the top of the machine body and the insulation sleeve outside the injection barrel via a heat-conducting air duct. During production, some of the hot air generated inside the machine body enters the heat-conducting air duct and flows around the outer wall of the injection barrel along the insulation sleeve, allowing the heat that would otherwise be discharged to first participate in the barrel's heat preservation. An auxiliary heater is arranged on the outer wall of the heat-conducting air duct. When continuous abnormalities trigger a shutdown detection or the machine body's waste heat is insufficient, the auxiliary heater supplements the heat to the airflow entering the insulation sleeve. The insulation sleeve forms a relatively concentrated heat exchange area for the injection barrel, thereby slowing down the cooling and viscosity increase of the PET melt during the shutdown interval. When injection resumes, the transition time required for the barrel to re-establish a stable temperature field can be shortened.

[0011] In a preferred embodiment of the present invention, the exhaust hood of the exhaust and heat dissipation mechanism is connected to the interior of the machine body. Multiple exhaust fans are arranged side-by-side inside the exhaust hood, allowing hot air not dissipated by the residual heat insulation mechanism to enter the exhaust hood through a larger air inlet section and be discharged together by the exhaust fans. A protective grille is installed on the exhaust fan outlet side, with the grille opening maintaining a continuous exhaust channel while isolating the rotating components from the external space. The monitoring and control center can switch the start / stop combinations of the exhaust fans according to the injection molding operation, visual scanning shutdown, and auxiliary heating status, ensuring that the heat required for barrel insulation is coordinated with the heat dissipation of the machine body, and preventing all hot air from being forced through a single pipeline, thus avoiding significant exhaust resistance.

[0012] As a preferred embodiment of the present invention, the injection molding mechanism is mounted on the injection molding machine frame. A storage hopper continuously feeds PET raw materials into the injection barrel. The injection drive pushes the molten material in the injection barrel into the mold installed in the mold storage area. After molding, the molded part is ejected by an ejector rod. The injection barrel is located inside the insulation sleeve, with its discharge end facing the mold storage area. The direction of the ejector rod's movement is connected to the feeding direction of the discharge conveyor, enabling the ejection action to directly deliver the molded part to the subsequent conveying path. This reduces the transfer links between the mold and the weighing platform and ensures that each molded part enters the weight detection area sequentially according to the injection molding cycle.

[0013] In a preferred embodiment of the present invention, the discharge conveyor receives the ejected part at one end near the mold storage area. The discharge conveyor ramp utilizes the height difference to move the molded part towards the weighing platform, with its lower end facing the feeding side of the weighing platform. Before reaching the platform, the molded part slows down along the ramp. Two transverse guide rails are installed on both sides of the discharge conveyor, providing support positions for the moving slide across the conveying path and keeping the binocular camera above the molded part during scanning. The discharge conveying path, the weighing platform, and the scanning transverse path thus form a spatial arrangement that intersects but does not encroach on each other.

[0014] In a preferred embodiment of the present invention, the weight sensor, electric push rod, drive motor, and binocular camera are respectively connected to the monitoring and control center. The monitoring and control center establishes detection records according to the order in which the molded parts enter the weighing platform. When a single weight anomaly occurs, the corresponding sorting is completed. When multiple consecutive weight anomalies reach a set number, the drive motor and binocular camera are then activated. The auxiliary heater, exhaust fan, injection drive component, and ejector push rod adopt independent control loops, enabling detection shutdown, barrel insulation, and machine body heat dissipation to be executed separately. The processing and display module centrally displays weight changes, the number of consecutive anomalies, scanning position, and equipment operating status.

[0015] As a preferred embodiment of the present invention, a protective inspection door is located on the front side of the machine body and corresponds to the side of the injection molding mechanism. When opened, it allows direct access to the injection drive component, injection barrel, and mold storage area. When closed, it separates the moving area from the outside of the machine body. A support base bears the main load of the machine body, and an operating platform is located on the other side and is lower than the lower edge of the protective inspection door. This provides a continuous standing position for operation display, observation of the mold area, and maintenance. The separation of the support area and the operating area reduces the direct impact of machine body vibration on the operating platform.

[0016] As a preferred embodiment of the present invention, multiple storage cabinets are arranged along the side of the machine body and the length of the discharge conveyor, capable of accommodating mold accessories, testing tools, and maintenance supplies respectively. The monitoring and control center is located above the storage cabinets, allowing signal and control lines to be centrally introduced from the side of the machine body. The display surface of the processing display module faces the operating platform, allowing operators to view continuous weight curves, binocular images, and abnormal location prompts without entering the discharge conveyor and sorting area. The storage, display, and operation areas are concentrated on the same side of the machine body, avoiding intersections with the access paths of the qualified product collection box and the defective product collection box.

[0017] The present invention has the following advantages: 1. The molded parts are weighed one by one by a weight sensor, and the monitoring and control center starts a binocular camera to scan laterally when there are continuous weight abnormalities. This creates a trigger relationship between normal weighing and fine visual detection during abnormal phases, reducing the load on the scanning mechanism during continuous operation. At the same time, it can correspond the location of missing material, flash, or dents with the continuous weight record.

[0018] 2. The pusher plate is driven by an electric push rod to move back and forth on one side of the weighing platform. With the cooperation of qualified product collection boxes and defective product collection boxes on both sides, the classification can be completed directly after weighing. The inspection sequence, sorting destination and scanning information of the molded parts are kept consistent, which is convenient for tracing consecutive abnormal batches.

[0019] 3. By introducing some of the hot air inside the machine body into the heat insulation sleeve outside the injection barrel through the heat conduction air duct, and using the auxiliary heater to supplement the heat during the shutdown inspection, the cooling and thickening of the PET melt can be delayed, reducing the probability of material stagnation at the barrel and nozzle, while utilizing the residual heat generated during the injection molding process.

[0020] 4. Multiple exhaust fans arranged in parallel inside the exhaust hood exhaust the hot air that is not utilized by the heat preservation mechanism, and the rotating parts are separated by a protective grille. This can create a diversion between residual heat preservation and heat dissipation of the machine body, and prevent the continuous accumulation of heat inside the machine body. Attached Figure Description

[0021] Figure 1 This is a 3D view of a PET injection molding machine.

[0022] Figure 2 This is a schematic diagram of the support structure in a PET injection molding machine.

[0023] Figure 3 This is a schematic diagram of the injection molding machine frame in a PET injection molding machine.

[0024] Figure 4 This is a structural breakdown diagram of the weighing and sorting mechanism in a PET injection molding machine.

[0025] Figure 5 This is a structural breakdown diagram of the vision scanning mechanism in a PET injection molding machine.

[0026] Figure 6 This is a structural diagram of the residual heat preservation mechanism in a PET injection molding machine.

[0027] Figure 7 This is a schematic diagram of the injection molding mechanism in a PET injection molding machine.

[0028] Figure 8 This is a structural breakdown diagram of the exhaust and heat dissipation mechanism in a PET injection molding machine.

[0029] In the diagram: 1. Machine body; 2. Weighing and sorting mechanism; 201. Bearing seat; 202. Weight sensor; 203. Weighing platform; 204. Electric push rod; 205. Push plate; 206. Qualified product collection box; 207. Defective product collection box; 3. Vision scanning mechanism; 301. Transverse guide rail; 302. Drive motor; 303. Transmission screw; 304. Guide rod; 305. Moving slide; 306. Binocular camera; 4. Waste heat preservation mechanism; 401. Heat conduction air duct; 402. Auxiliary heater; 4 03. Insulation sleeve; 5. Exhaust and heat dissipation mechanism; 501. Exhaust hood; 502. Exhaust fan; 503. Protective grille; 6. Injection molding mechanism; 601. Injection molding machine frame; 602. Storage hopper; 603. Injection drive component; 604. Injection barrel; 605. Mold storage area; 606. Ejector rod; 7. Material conveyor frame; 8. Material conveyor ramp; 9. Monitoring and control center; 10. Processing and display module; 11. Protective inspection door; 12. Support base; 13. Operating platform; 14. Storage cabinet. Detailed Implementation

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Example 1

[0032] Please see Figures 1 to 8 This embodiment focuses on the continuous path of PET molded parts from injection molding to sorting and collection. The machine body 1 constitutes the main body of the enclosed equipment. The injection molding mechanism 6 is located in the molding area inside the machine body 1. The discharge conveyor 7 extends from the mold storage area 605 to the weighing and sorting mechanism 2, which is located at the end of the conveyor. The vision scanning mechanism 3 is positioned above the discharge conveyor 7. The waste heat preservation mechanism 4 and the exhaust heat dissipation mechanism 5 are both located on the top of the machine body 1; the former is located near the injection cylinder 604, and the latter corresponds to the location where hot air rises concentratedly inside the machine body 1. The monitoring and control center 9 and the processing and display module 10 are located on the operating side of the machine body 1, separating the mechanical conveying path from the observation and control position.

[0033] During production, PET raw material enters the injection barrel 604 from the storage hopper 602. The injection drive 603 applies injection thrust along a set direction on the injection molding frame 601, sending the plasticized material into the mold installed in the mold storage area 605. After the mold completes pressure holding and cooling, the ejector rod 606 pushes the molded part out from the other side of the mold. The molded part falls directly to the feeding end of the discharge conveyor 7 and moves towards the weighing platform 203 under the guidance of the discharge conveyor ramp 8. The discharge conveyor ramp 8 has a continuous inclined surface, with the end closer to the weighing platform 203 being lower. This gradually reduces the drop as the molded part moves forward under its own weight, preventing the molded part from directly impacting the weight sensor 202 with a large impact force, thereby maintaining the detection stability of the weighing platform 203.

[0034] The weighing and sorting mechanism 2 uses a support base 201 as an independent support foundation. Multiple weight sensors 202 are sandwiched between the support base 201 and the weighing platform 203 and distributed along the length of the platform. After the molded part is fully inserted into the weighing platform 203, the multiple weight sensors 202 synchronously output force signals. The monitoring and control center 9 calculates stable values ​​for each signal and compares them with the weight range corresponding to the current mold and product specifications. When the weight of the molded part is within the set range, the electric push rod 204 drives the pusher plate 205 to move towards the qualified product collection box 206. When the weight of the molded part exceeds the set range, the electric push rod 204 changes its direction of motion, causing the pusher plate 205 to send the molded part into the defective product collection box 207. After the pusher plate 205 is completed, it returns to the edge of the weighing platform 203, leaving a complete bearing area for the next molded part.

[0035] The visual scanning mechanism 3 does not continuously scan all molded parts, but enters the scanning state only after the monitoring and control center 9 records the continuous occurrence of similar weight anomalies. The drive motor 302 drives the transmission screw 303 to rotate. One end of the moving slide 305 forms a threaded transmission with the transmission screw 303, while the other end slides along the guide rod 304. Two transverse guide rails 301 jointly limit the lateral movement height and posture of the moving slide 305. The binocular camera 306 moves with the moving slide 305 from one side of the discharge conveyor 7 to the other, acquiring images from different viewing angles before and during the period the molded parts enter the weighing platform 203. The monitoring and control center 9 binds the image outline, defect area, and weight records according to the discharge sequence, and then the processing and display module 10 displays the location of the anomaly and the number of consecutive occurrences.

[0036] The protective inspection door 11 on the front side of the machine body 1 corresponds to the side of the injection molding mechanism 6. It remains closed during normal operation to separate the movement space of the injection drive component 603, the mold storage area 605, and the ejector rod 606. During maintenance, it is opened to allow access to these components from the front of the machine body 1. The support base 12 bears the main weight of the machine body 1 and its internal mechanisms. The operating platform 13 is located on the other side and corresponds to the processing display module 10, facilitating observation of the weighing curve and scanned images. Multiple storage cabinets 14 are arranged along the side of the machine body 1, without occupying the space for the qualified product collection box 206 and the defective product collection box 207. Commonly used mold accessories and testing tools can be stored in separate cabinets according to their purpose. This overall arrangement creates interconnected and unobstructed working areas for molding, conveying, testing, sorting, display, and maintenance.

[0037] During assembly and debugging, the discharge conveyor frame 7 is first adjusted based on the mounting surfaces of the injection molding machine frame 601 and the support seat 201, so that the lower end of the discharge conveyor ramp 8 is above the feeding edge of the weighing platform 203, and the molded part can fall completely into the effective bearing area enclosed by multiple weight sensors 202 after leaving the ramp. Then, the two transverse guide rails 301 are kept parallel, and when the moving slide 305 is in the middle of its stroke, the field of view center of the binocular camera 306 corresponds to the center area of ​​the weighing platform 203. The reference values ​​of multiple weight sensors 202 are recorded under no-load conditions, and then a standard weight is placed to compare the detection values. The calibration results are saved when the differences between each point are within the set range. This debugging sequence corrects the weighing and scanning positions based on the actual movement path of the molded part, which can reduce the accumulation of installation deviations in continuous detection.

[0038] During continuous production, the monitoring and control center 9 also accumulates the number of products according to the sorting direction of the qualified product collection box 206 and the defective product collection box 207, and saves the corresponding weight value and action status after each push action is completed. When changing molds or product specifications, the weight range and the number of consecutive abnormalities can be switched in the processing display module 10, and a new batch record can be established starting from the empty weighing platform 203. If the weight sensor 202 still detects residual load after the pusher plate 205 is reset, the monitoring and control center 9 pauses the next ejection action to check whether the molded part is stuck at the edge of the platform. This avoids two molded parts occupying the weighing platform 203 at the same time, and ensures that each weight record always corresponds to a clear sorting result. Example 2

[0039] Please see Figure 1 , Figure 3 , Figures 5 to 8 The rest of the content of this embodiment is the same as that of embodiment 1, except that: the monitoring and control center 9 establishes a sequential number for each molded part delivered by the ejector pusher 606, and sequentially writes the detection value output by the weight sensor 202, the movement direction of the pusher plate 205, and the corresponding collection box information. When the weight of a single molded part is abnormal, the weighing and sorting mechanism 2 first completes the defect sorting, and the equipment can still observe subsequent molded parts according to the set conditions. When the weight deviation in the same direction reaches the set number of times, the monitoring and control center 9 suspends the injection drive 603 and the ejector pusher 606, and causes the vision scanning mechanism 3 to enter the diagnostic action to avoid occasional weighing fluctuations directly causing the entire machine to stop.

[0040] During the diagnostic process, molded parts from consecutive abnormal batches can be sequentially held between the discharge conveyor sloping plate 8 and the weighing platform 203. The drive motor 302 rotates forward and backward, driving the moving slide 305 to reciprocate laterally. The binocular camera 306 captures images of the opening, sidewalls, and bottom contours of the molded parts from multiple positions. The transmission screw 303 provides stable lateral displacement, and the guide rod 304 bears the deflection load generated by the moving slide 305, ensuring that the binocular camera 306 remains facing the detection area during the reciprocating motion. The monitoring and control center 9 compares the recurring defect locations of multiple abnormal molded parts. If the defects are concentrated in the same area, the corresponding mold inspection location can be displayed on the processing display module 10. If the defect locations are dispersed, the weight change trend is displayed synchronously, facilitating further inspection of the feeding, injection, or cooling status.

[0041] After a series of abnormal shutdowns, the PET melt inside the injection barrel 604 temporarily stops flowing to the mold, and the residual heat insulation mechanism 4 immediately enters the heat preservation state. Some of the rising hot air inside the machine body 1 enters through the air inlet of the heat-conducting air duct 401 and is guided to the heat-insulating sleeve 403 fitted outside the injection barrel 604. The hot air flows along the outer wall of the barrel and then exits from the end of the sleeve, maintaining a relatively uniform thermal environment around the injection barrel 604. When the monitoring and control center 9 detects that the shutdown time exceeds the set value or the temperature of the heat-conducting airflow is insufficient, the auxiliary heater 402 starts working to supplement the heat of the airflow through the heat-conducting air duct 401, avoiding temperature concentration caused by direct heating only in a localized area of ​​the barrel.

[0042] The exhaust and heat dissipation mechanism 5 and the waste heat insulation mechanism 4 work together to handle the hot air inside the machine body 1. During normal continuous injection molding, multiple exhaust fans 502 maintain an exhaust state that matches the heat generation. Hot air that does not enter the heat conduction duct 401 is extracted by the exhaust hood 501, and the protective grille 503 keeps the exhaust side unobstructed and isolates the exhaust fans 502. After the equipment enters a short-term diagnostic shutdown, the speed of some exhaust fans 502 can be reduced or some can be stopped, so that there is still enough hot air inside the machine body 1 to enter the heat conduction duct 401. After the injection barrel 604 resumes injection or the internal temperature of the machine body 1 rises, the exhaust volume is increased again. The above-mentioned diversion method allows waste heat utilization and machine body heat dissipation to switch according to the operation stage, without requiring all hot air to pass through the insulation sleeve 403.

[0043] After completing the visual diagnosis, the operator can view the weight curve, abnormal part image, and defect repetition area displayed on the processing display module 10 on the operating platform 13, and check the mold storage area 605, injection cylinder 604, or ejector rod 606 through the protective inspection door 11 as prompted. During the inspection, the qualified product collection box 206 and the defective product collection box 207 are kept separate to prevent qualified products from being mixed in with consecutive abnormal batches. Upon restart, the auxiliary heater 402 first maintains the heat conduction airflow. After the injection cylinder 604 reaches the recovery condition, the monitoring and control center 9 then sequentially starts the injection drive 603, ejector rod 606, and weighing and sorting mechanism 2, so that the inspection records before and after the shutdown diagnosis form a continuous batch in the processing display module 10.

[0044] The number of consecutive abnormalities can be set according to the number of mold cavities and injection cycle time. When the number of consecutive abnormalities has not yet reached the set value, the monitoring and control center 9 only controls the push plate 205 to send the abnormal parts into the defective product collection box 207 and continues to read the weight of subsequent molded parts. When the set value is reached, the most recent multiple abnormal parts are then treated as the same diagnostic group. After the binocular camera 306 completes one lateral scan, the moving slide 305 returns to the initial end of the lateral guide rail 301. The monitoring and control center 9 compares the degree of overlap of defect areas in the images of different abnormal parts and generates inspection prompts based on the direction of weight bias. When the weight is consistently too light and the defect location in the image is repeated, the corresponding mold area is displayed first. When the weight is too heavy and accompanied by outward expansion of the contour, overflow inspection information is displayed, so that continuous detection data are processed according to the same judgment chain.

[0045] In the event of a prolonged shutdown, the monitoring and control center 9 can intermittently operate the auxiliary heater 402 and run some exhaust fans 502 at low speeds. The heat-conducting air duct 401 continuously supplies a relatively stable airflow to the insulation sleeve 403, while the exhaust hood 501 simultaneously discharges the hot air accumulated in other areas of the machine body 1. Before resuming operation, the injection drive 603 performs a short-stroke pre-compression to re-establish the pressure state of the material in the injection barrel 604, and the ejector rod 606 remains retracted. After a trial injection is completed, the prototype part is sent to the weighing platform 203. If the weight of the prototype part returns to the set range, the equipment enters a normal continuous cycle. If there is still a deviation, defect sorting is maintained and visual scanning is restarted to prevent prototype parts that have not reached a stable state from directly entering the qualified product collection box 206.

[0046] Based on the designed weighing and sorting mechanism 2, another alternative embodiment can be implemented: the linear pushing structure formed by the electric push rod 204 and the pusher plate 205 can be replaced with a steering motor, a swing shaft, and a diversion swing plate. The diversion swing plate is installed at the discharge edge of the weighing platform 203, and the steering motor drives the diversion swing plate to deflect towards either the qualified product collection box 206 or the defective product collection box 207 via the swing shaft. After the molded part is weighed, it moves along the discharge direction of the platform. The diversion swing plate changes its guide angle according to the weight result, causing the molded part to enter the corresponding collection box. This structure still maintains the positional relationship between the two collection boxes and changes the reciprocating pushing action to a small-angle swing, which can shorten the reset stroke of the diversion component when the discharge cycle is fast.

[0047] In the implementation of this invention, the storage hopper 602 feeds PET raw materials into the injection cylinder 604, and the injection drive 603 pushes the molten material into the mold installed in the mold storage area 605. After molding is completed, the ejector rod 606 sends the molded part to the discharge conveyor frame 7. The molded part enters the weighing platform 203 along the discharge conveyor inclined plate 8. Multiple weight sensors 202 collect the weight of a single part and transmit the signal to the monitoring and control center 9. The electric push rod 204 drives the pusher plate 205 to move in the corresponding direction according to the comparison result, so that qualified products enter the qualified product collection box 206 and abnormal products enter the defective product collection box 207. Then the pusher plate 205 is reset and waits for the next molded part.

[0048] When the monitoring and control center 9 records a continuous weight abnormality in the molded part, the injection drive 603 and the ejector rod 606 pause. The drive motor 302 drives the transmission screw 303 to rotate. The moving slide 305 moves along the two transverse guide rails 301 under the restriction of the guide rod 304. The binocular camera 306 scans the abnormal molded part from different positions and transmits the image information and corresponding weight records back to the monitoring and control center 9. The processing and display module 10 displays the defect area, weight change and inspection location, so that the continuous abnormality is no longer limited to the weight judgment level, but can further form positioning information oriented towards the mold or injection state.

[0049] During the shutdown scan, some of the hot air inside the machine body 1 enters the insulation sleeve 403 through the heat conduction air duct 401 and flows around the injection cylinder 604. When the heat is insufficient, the auxiliary heater 402 supplements the heat of the airflow, delaying the cooling and thickening of the PET melt in the injection cylinder 604. The remaining hot air is discharged by the exhaust fan 502 in the exhaust hood 501. The protective grille 503 separates the exhaust area. After the diagnosis is completed and the abnormality is eliminated, the monitoring and control center 9 resumes the injection, ejection, weighing and sorting actions in sequence, so that the equipment can smoothly return to the continuous production state from the shutdown test.

[0050] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A PET injection molding machine, comprising a machine body (1), characterized in that, The machine body (1) is provided with an injection molding mechanism (6) and a weighing and sorting mechanism (2) in sequence along the material conveying direction. The top edge of the machine body (1) is provided with a residual heat insulation mechanism (4). The top center of the machine body (1) is provided with an exhaust heat dissipation mechanism (5). The center of the machine body (1) is provided with a discharge conveying frame (7). The top of the discharge conveying frame (7) is provided with a discharge conveying inclined plate (8). The machine body (1) is provided with a visual scanning mechanism (3). The visual scanning mechanism (3) is located above the discharge conveying frame (7). The outside of the machine body (1) is provided with a monitoring and control center (9). The monitoring and control center (9) is connected to a processing display module (10). The weighing and sorting mechanism (2) and the visual scanning mechanism (3) are electrically connected to the monitoring and control center (9). The weighing and sorting mechanism (2) includes a support seat (201), which is installed on the inner bottom wall of the machine body (1). A weight sensor (202) is provided on the top of the support seat (201), and a weighing platform (203) is provided on the top of the weight sensor (202). An electric push rod (204) is provided on one side of the weighing platform (203), and a pusher plate (205) is provided at the output end of the electric push rod (204). A qualified product collection box (206) and a defective product collection box (207) are respectively provided on both sides of the support seat (201).

2. The PET injection molding machine according to claim 1, characterized in that, The length direction of the pusher plate (205) is parallel to the feeding direction of the weighing platform (203), and the openings of the qualified product collection box (206) and the defective product collection box (207) are located at both ends of the moving path of the pusher plate (205).

3. The PET injection molding machine according to claim 1, characterized in that, The visual scanning mechanism (3) includes two parallel transverse guide rails (301). One of the transverse guide rails (301) has a drive motor (302) at its end and a transmission screw (303) at its output end. The transmission screw (303) is rotatably connected to the corresponding transverse guide rail (301). The other transverse guide rail (301) has a guide rod (304) inside it. A movable slide (305) is provided between the two transverse guide rails (301). One end of the movable slide (305) is threadedly connected to the transmission screw (303), and the other end of the movable slide (305) is slidably connected to the guide rod (304). A binocular camera (306) is provided at the bottom of the movable slide (305).

4. The PET injection molding machine according to claim 1, characterized in that, The waste heat insulation mechanism (4) includes a heat-conducting air duct (401), the air inlet of the heat-conducting air duct (401) is connected to the top of the machine body (1), an auxiliary heater (402) is provided on the outer wall of the heat-conducting air duct (401), and an insulation sleeve (403) is connected to the air outlet of the heat-conducting air duct (401). The insulation sleeve (403) is sleeved on the outside of the injection cylinder (604).

5. The PET injection molding machine according to claim 1, characterized in that, The exhaust and heat dissipation mechanism (5) includes an exhaust hood (501), the lower port of which is connected to the interior of the body (1), and multiple exhaust fans (502) are arranged in parallel inside the exhaust hood (501). A protective grille (503) is provided at the upper port of the exhaust hood (501), and the protective grille (503) spans the air outlet side of the multiple exhaust fans (502).

6. The PET injection molding machine according to claim 1, characterized in that, The injection molding mechanism (6) includes an injection frame (601), an injection drive (603) is provided on one side of the top of the injection frame (601), an injection barrel (604) is provided at the output end of the injection drive (603), a storage hopper (602) is connected to the top of the injection barrel (604), the discharge end of the injection barrel (604) faces the mold storage area (605), an ejector rod (606) is provided on the other side of the mold storage area (605), and the extension and retraction direction of the ejector rod (606) corresponds to the feeding direction of the discharge conveyor (7).

7. The PET injection molding machine according to claim 6, characterized in that, The feeding end of the discharge conveyor (7) is set opposite to the push rod (606). The discharge conveyor sloping plate (8) is inclined downward along the conveying direction of the discharge conveyor (7). The lower end of the discharge conveyor sloping plate (8) faces the feeding side of the weighing platform (203). The two sides of the discharge conveyor (7) are connected to two transverse guide rails (301) respectively.

8. The PET injection molding machine according to claim 1, characterized in that, The weight sensor (202), electric push rod (204), drive motor (302) and binocular camera (306) are connected to the monitoring and control center (9) via independent signal lines. The auxiliary heater (402), exhaust fan (502), injection drive (603) and ejection push rod (606) are connected to the monitoring and control center (9) via control lines. The signal input terminal of the processing and display module (10) is connected to the signal output terminal of the monitoring and control center (9).

9. The PET injection molding machine according to claim 1, characterized in that, The front side of the machine body (1) is provided with a protective inspection door (11), which is opposite to the side of the injection molding mechanism (6). A support base (12) is provided on one side of the bottom of the machine body (1), and an operating platform (13) is provided on the other side of the bottom of the machine body (1). The upper surface of the operating platform (13) is lower than the lower edge of the protective inspection door (11).

10. The PET injection molding machine according to claim 1, characterized in that, Multiple storage cabinets (14) are provided on one side of the machine body (1). The multiple storage cabinets (14) are arranged along the length of the discharge conveyor (7). The monitoring and control center (9) is located above the storage cabinets (14), and the display surface of the processing display module (10) faces the operating platform (13).

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