Lightweight two-way mold injection blow bottle integrated machine

Abstract

The present application relates to the technical field of bottle blowing machine, in particular to a light two-way mold closing injection blow bottle integrated machine, comprising a rack, which is applied to plastic waste recycling industry, a rotary disc template is arranged above the rack, a bottle blowing stretching device is arranged on the rotary disc template, the bottle blowing stretching device comprises four stretching guide rods which respectively penetrate four corner points of a U-shaped sealing sliding plate, the bottom of the stretching guide rod is fixedly connected to the rotary disc template, the top is fixedly connected with a stretching mounting plate, stretching cylinder one is fixedly installed at both ends of the top surface of the stretching mounting plate, the movable end of the stretching cylinder one penetrates the stretching mounting plate and is fixedly connected with the U-shaped sealing sliding plate; the bottom of the U-shaped sealing sliding plate is connected with a sealing plate; the central stress problem of bearing huge bending moment is changed into the two-end stress problem of bearing minimum bending moment; the U-shaped sealing sliding plate is designed to be lighter and thinner, and better rigidity and pressure uniformity can be obtained.

Description

Technical Field

[0001] This invention relates to the field of blow molding machine technology, specifically to a lightweight bidirectional injection molding blow molding machine. Background Technology

[0002] Injection molding and blow molding integrated machines are widely used in the pharmaceutical, cosmetic and high-end food packaging fields as a high-precision and high-efficiency thermoplastic container production equipment. These machines typically integrate continuous processes such as injection molding preform preparation, temperature control, blow molding and demolding, and can produce hollow products with precise bottle mouth dimensions and no flash in one step.

[0003] In the blow molding process, the sealing mechanism of the blow molding device plays a crucial role. Existing injection blow molding machines, such as the device disclosed in Chinese Patent Publication No. CN222246050U, typically include a guide assembly connected to a turntable template and a sealing slide plate that slides along the guide assembly in their blow molding sealing mechanism. During operation, the drive device moves the sealing slide plate and the sealing plate fixed below it back and forth in the vertical direction. After the mold is closed, the sealing plate needs to press down on the top of the mold cavity to form a sealed space that can withstand high-pressure blowing and to assist in the positioning of the bottle mouth.

[0004] In actual industrial design, in order to avoid the rotating shaft, air circuit rotary joint and mandrel assembly of the blow molding and stretching device located at the center of the turntable, the sealing slide is usually designed as a non-enclosed "C" or "U" shaped structure. In order to simplify the mechanical structure and take advantage of the wider installation space on the back of the C-shaped plate, the piston rod moving end of the cylinder is usually fixedly connected to the middle position of the "C" shaped sealing slide (i.e. the geometric center area of ​​the back of the C-shaped structure), thereby driving the sealing slide and the sealing plate to move synchronously.

[0005] However, in existing technologies, there is a significant spatial misalignment between the driving force center (back of the slide plate) and the sealing reaction center (deep in the C-shaped opening), causing the slide plate to bear a huge cantilever bending moment under sealing conditions. Due to the weak bending stiffness of the C-shaped opening end and the inherent synchronization error of the dual-cylinder pneumatic system, the slide plate is prone to tipping upwards and tilting laterally during the pressing process. This structural off-center loading directly destroys the parallelism of the sealing surface, resulting in a severely uneven distribution of force points, which seriously restricts the yield and operational stability of the equipment. Furthermore, the frequent defective products caused by this also lead to higher processing costs and energy consumption burdens for subsequent plastic waste recycling.

[0006] To address this, a lightweight, two-way mold-closing injection blow molding machine is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a lightweight bidirectional injection molding blow molding machine. By using tension guide rods at the four corners of the top surface of the C-shaped sealing slide plate, and tension mounting plates connected to the top of the tension guide rods, tension cylinders are fixedly installed between each pair of tension guide rods on the tension mounting plates. This transforms a "central force" problem with huge bending moments into a "two-end force" problem with minimal bending moments. This allows the sealing slide plate itself to be designed to be thinner and lighter, while also achieving better rigidity and pressure uniformity.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A lightweight, two-way injection molding and blow molding machine is used in the plastic waste recycling industry. It includes a frame, injection molding unit, heating unit, and degumming unit. A turntable template is mounted above the frame, and a blow molding stretching device is mounted on the turntable template. The blow molding stretching device includes four stretching guide rods, which pass through and connect to the four corner points of a C-shaped sealing slide. The bottom of each stretching guide rod is fixedly connected to the turntable template, and the top is fixedly connected to a stretching mounting plate. A stretching cylinder is fixedly mounted at each end of the top surface of the stretching mounting plate. The movable end of each stretching cylinder passes through the stretching mounting plate and is fixedly connected to the C-shaped sealing slide, positioned between two stretching guide rods. A sealing plate is connected to the bottom of the C-shaped sealing slide. Preferably, a rectangular mounting plate is provided in the space enclosed by the four stretching guide rods. Fixed rods are fixedly connected to the four corners of the rectangular mounting plate, and the other end of the fixed rods is fixedly connected to the C-shaped sealing slide plate. A second stretching cylinder is fixedly installed on the rectangular mounting plate. The movable end of the second stretching cylinder passes through the rectangular mounting plate and connects to the stretching plate assembly. Multiple stretching core rods are fixedly connected to the bottom of the stretching plate assembly. Each stretching core rod corresponds one-to-one with the inner hole of the preform on the sealing plate. Multiple air blowing connectors are provided on one side of the sealing plate. The end of each air blowing connector communicates with the inner hole of the preform and is connected to an external air source.

[0009] Preferably, guide rods are fixedly connected to the tension plate assembly on both sides of the movable end of the tension cylinder, and the other end of the guide rods passes through the rectangular mounting plate and is slidably connected to it.

[0010] Preferably, a groove is provided in the middle of the stretch mounting plate, the groove being used to prevent the vertical movement of the second stretch cylinder from being obstructed during the bottle blowing process.

[0011] Preferably, the frame is provided with a mold closing device, which includes two symmetrically placed mold closing cylinders; each of the two symmetrically placed mold closing cylinders has a template fixedly installed on its movable end, and the two templates are driven by the corresponding mold closing cylinders; a rectangular plate is installed on the side wall of each mold closing cylinder, the rectangular plate has a sliding groove, two sensors are installed in the sliding groove, a guide rod is installed on the template, and a sensing ring is installed at the end of the guide rod away from the template.

[0012] Preferably, a turntable is provided at the center of the turntable template, and a turntable drive mechanism is connected to the top of the turntable. The turntable drive mechanism includes a mounting base connected to the top surface of the turntable template, a servo motor connected to the top of the mounting base, and a reducer, a spline, and a drive shaft disposed inside the mounting base. The output shaft of the servo motor is connected to the reducer and then connected to the drive shaft through the spline. The bottom of the drive shaft is connected to the center of the turntable, and the rotation angle and rotation position of the turntable are controlled by the servo motor.

[0013] Preferably, it also includes a screw feeding device; the screw feeding device is provided at the front of the frame, and the screw feeding device consists of a drive module and a feeding module. The drive module includes a cylinder body, a motor mounting base, a hydraulic motor, a front drive shaft, a cylinder piston, a rear drive shaft, and a rotary bearing; the cylinder body is horizontally connected to the motor mounting base and the hydraulic motor in sequence; the front drive shaft passes through the motor mounting base; the rear drive shaft is fitted with a rotary bearing, which is located on both sides of the motor mounting base; the hydraulic motor is connected to the motor mounting base, and its drive end is connected to the front drive shaft for driving the front drive shaft to rotate; the hydraulic... The motor is equipped with two oil pipes; the cylinder body has a chamber inside, and a rear drive shaft is installed in the chamber. A cylinder piston is fitted on the outer surface of the rear drive shaft and contacts the inner wall of the chamber; a rotary bearing is fitted on the rear drive shaft and is located on both sides of the cylinder piston; the bottom of the cylinder body has a release port and an injection port on both sides of the cylinder piston, which are respectively connected to their corresponding oil pipes; the front drive shaft passes through the cylinder body and is splined to the rear drive shaft; the rear drive shaft passes through the cylinder body and is connected to the feeding module; the connection between the rear drive shaft and the cylinder body is made by a cylinder connecting sleeve; the drive module provides power to the feeding module.

[0014] Preferably, a rotary oil seal is connected between the outer surface of the front drive shaft and the inner surface of the opening of the motor mounting base; a rotary oil seal is provided between the cylinder piston and the inner wall of the cylinder body and the outer surface of the rear drive shaft; and a rotary oil seal is provided between the cylinder connecting sleeve and the outer surface of the rear drive shaft. Rotary oil seals achieve reliable sealing at the dynamic and static interfaces, effectively blocking high-pressure hydraulic oil and preventing the intrusion of external contaminants, thus ensuring the system's pressure stability and cleanliness. Secondly, the excellent motion adaptability of rotary oil seals allows them to maintain a tight fit under complex working conditions of high-speed shaft rotation accompanied by slight axial movement, avoiding seal failure caused by vibration. Finally, their low-friction characteristics significantly reduce wear on the drive shaft and cylinder inner wall, reducing energy loss and thus greatly extending the service life of core components and the maintenance-free cycle of equipment.

[0015] Preferably, the spline is an involute spline; The involute spline used in this application is to meet the stringent requirements of "high torque transmission, high precision positioning, and long service life" for lightweight two-way injection molding blow molding machines. It solves the problem of turntable centering by utilizing the self-centering effect and solves the problem of impact resistance by utilizing high-strength tooth roots, which is something that rectangular splines cannot achieve.

[0016] Preferably, the C-shaped sealing slide plate is inverted stepped; This application adopts an inverted stepped C-shaped sealing slide plate, which, compared to the existing technology's upward-facing upright stepped design, can specifically solve two major technical defects: Firstly, the existing upright stepped structure is prone to becoming a deposition platform for plastic debris and oil stains in the high-dust environment of injection molding and blow molding, thus aggravating guide rail wear. The inverted C-shaped structure of this application can cleverly utilize gravity to shield the natural settling of external dust, fundamentally preventing abrasive wear, significantly extending the precision life of moving parts and reducing maintenance frequency. Secondly, when the existing upright stepped structure is subjected to the upward separation force generated by high-pressure blowing, it mainly relies on bolt tension, which has poor rigidity and is prone to "breathing effect" leading to flash at the bottle mouth. This application can use the upward thrust during blowing to press the sealing plate against the inverted stepped surface of the sealing slide plate, converting the separation force into a clamping force, achieving the effect of tighter sealing with greater pressure, and completely eliminating the risk of slight separation at the seal.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. To address the technical challenges of excessively long lever arms, easy front-end warping, and seal leakage caused by single-point drive on the back of the "C"-shaped skateboard in existing technologies, this invention adopts a spatial layout of "four-corner stretching guide + two-end cylinder drive". This design shifts the force application point from the back of the skateboard to both sides of the geometric center, transforming the complex cantilever bending moment into simple pure pressure and eliminating structural off-center loading. While ensuring the absolute parallelism of the sealing surface, it allows for a thinner and lighter skateboard structure, thereby reducing the moment of inertia and improving the operating speed and product yield of the equipment.

[0018] 2. This invention uses a bidirectional symmetrical mold closing mechanism to replace the traditional single-sided drive or crankshaft locking mechanism. The two side mold plates move towards the center simultaneously, which not only doubles the relative speed of mold closing and shortens the molding cycle, but also eliminates the lateral shear force on the preform, ensuring the coaxiality of the bottle wall thickness. With the addition of a sliding groove sensor design, the equipment can flexibly adjust the mold opening stroke according to different mold sizes, avoiding ineffective movement time. At the same time, the open mold closing space breaks through the limitations of traditional tie rods on mold size, allowing lightweight equipment to be compatible with ultra-wide molds such as multi-cavity side-by-side molds, greatly expanding the applicability of the equipment.

[0019] 3. This invention introduces involute spline direct connection technology into the turntable drive, eliminating the need for bulky couplings and significantly reducing the vertical height of the drive head in the Z-axis direction. This effectively avoids the risk of spatial interference with the densely packed injection nozzles, tension cylinders, and other mechanisms above the turntable, reserving valuable process clearance space for the compact integrated machine. Furthermore, by utilizing its automatic centering and high load-bearing characteristics, it solves the problems of cumulative error and insufficient rigidity in traditional coupling connections, achieving high-precision rotational positioning of the turntable.

[0020] 4. The inverted step design of the inverted step plate of the inverted sealing plate of this invention cleverly transforms the air pressure separation force during bottle blowing into a sealing and clamping force, forming a self-locking effect of "the greater the pressure, the tighter the seal". Combined with the shielding effect of the inverted structure against dust, it fundamentally blocks wear and leakage, significantly reducing the maintenance frequency and operating cost of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the frame and the structure on the frame of the present invention; Figure 3 This is a schematic diagram of the blow molding and stretching device of the present invention; Figure 4 This is a side view of the blow molding and stretching device structure of the present invention; Figure 5 This is a schematic diagram of the mold clamping device of the present invention; Figure 6 This is a schematic diagram of the turntable template structure of the present invention; Figure 7 This is a cross-sectional view of the rotation drive mechanism of the present invention; Figure 8 This is a cross-sectional view of the screw feeding device of the present invention.

[0022] In the diagram: 1. Chassis; 2. Frame; 3. Turntable template; 31. Turntable; 32. Turntable drive mechanism; 321. Mounting base; 322. Servo motor; 323. Reducer; 324. Spline; 325. Drive shaft; 38. Die head; 4. Blow molding stretching device; 41. Stretching guide rod; 411. C-shaped sealing slide plate; 412. Stretching mounting plate; 413. Stretching cylinder one; 414. Sealing plate; 42. Rectangular mounting plate; 421. Fixing rod; 422. Stretching cylinder two; 423. Stretching plate assembly; 424. Stretching core rod; 425. Guide rod; 5. Mold closing device; 51. Mold closing cylinder; 52. Template; 53. Rectangular plate; 54. Slide groove; 55. Sensor; 56. Guide rod; 57. Sensing ring; 6. Screw feeding device; 61. Drive module; 62. Feeding module; 611. Cylinder body; 612. Motor mounting base; 613. Hydraulic motor; 614. Front drive shaft; 615. Cylinder piston; 616. Rear drive shaft; 617. Rotary bearing; 618. Oil pipe; 6181. Unloading oil port; 6182. Injection oil port; 621. Screw. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 4 This invention provides a lightweight two-way mold clamping injection blow molding machine, the technical solution of which is as follows: A lightweight bidirectional injection molding and blow molding machine is applied in the plastic waste recycling industry. It includes a frame 2, an injection molding device, a heating device, and a degumming device. A turntable template 3 is installed above the frame 2, and a blow molding stretching device 4 is installed on the turntable template 3. The blow molding stretching device 4 includes four stretching guide rods 41, which pass through and connect to the four corner points of a C-shaped sealing slide plate 411. The bottom of each stretching guide rod 41 is fixedly connected to the turntable template 3, and the top is fixedly connected to a stretching mounting plate 412. A stretching cylinder 413 is fixedly installed at each end of the top surface of the stretching mounting plate 412. The movable end of each stretching cylinder 413 passes through the stretching mounting plate 412 and is fixedly connected to the C-shaped sealing slide plate 411, located between pairs of stretching guide rods 41. A sealing plate 414 is connected to the bottom of the C-shaped sealing slide plate 411. A rectangular mounting plate 42 is located within the space enclosed by the four stretching guide rods 41. Fixing rods 421 are fixedly connected to the four corners of the rectangular mounting plate 42. The other end of each fixing rod 421 is fixedly connected to the U-shaped sealing slide plate 411. A second stretching cylinder 422 is fixedly mounted on the rectangular mounting plate 42. The movable end of the second stretching cylinder 422 passes through the rectangular mounting plate 42 and connects to a stretching plate assembly 423. Multiple stretching core rods 424 are fixedly connected to the bottom of the stretching plate assembly 423. Each stretching core rod 424 corresponds one-to-one with the inner hole of the preform on the sealing plate 414. Multiple air-blowing connectors are provided on one side of the sealing plate 414. Each air-blowing connector's end communicates with the inner hole of the preform and is connected to an external air source. The stretch mounting plate 412 has a groove in the middle, which is used to prevent the stretch cylinder 422 from being obstructed in the vertical direction during the bottle blowing process. Guide rods 425 are fixedly connected to the tension plate assembly 423 on both sides of the movable end of the tension cylinder 422. The other end of the guide rods 425 passes through the rectangular mounting plate 42 and is slidably connected to it. The C-shaped sealing slide plate 411 is inverted step shape. When the preform in the heating device is transferred to the area directly below the blow molding and stretching device 4, the hydraulic cylinder drives the rotating template 3 to move downwards along the guide rail on the frame 2. Simultaneously, it drives two stretching cylinders 413 to control the overall downward movement of the C-shaped sealing slide plate 411. During the downward movement, the C-shaped sealing slide plate 411 moves vertically under the guidance of the stretching guide rods 41. The long-span guide formed by the four stretching guide rods 41 ensures the absolute verticality of the downward trajectory of the C-shaped sealing slide plate 411, even when stretched... There is a slight imbalance in the thrust of the extension cylinder 413. The rigid tension guide rod 41 can also force the C-shaped sealing slide plate 411 to descend horizontally to prevent jamming. At the same time, the downward movement of the C-shaped sealing slide plate 411 also drives the sealing plate 414 to move down to the specified position to achieve the sealing effect. Moreover, through the tension cylinders 413 set at both ends of the C-shaped sealing slide plate 411, the force application point is actually shifted from the back to both sides of the geometric center of the C-shaped sealing slide plate 411 to achieve surface pressing. After sealing, the stretching plate assembly 423 is lowered by driving the stretching cylinder 422, so that all the stretching core rods 424 are inserted into the interior of each preform to complete the stretching action of the preform. At the same time, under the guidance of the guide rod 425 and the rigid guidance of the C-shaped sealing slide plate 411 by the four stretching guide rods 41, the stretching core rods 424 are ensured to extend straight to the bottom of the bottle, ensuring the axial symmetry of the bottle wall thickness distribution. Then, each preform is blown by an external high-pressure air source through the air blowing connector. The bottle blowing process is realized by the combination of air blowing and stretching, and the preform is blown into a bottle. After the air blowing ends, the air is vented. First, the stretching cylinder 422 is driven to retract and the stretching core rods 424 are restored to their original positions. Then, the stretching cylinder 413 is driven to retract and drive the C-shaped sealing slide plate 411, sealing plate 414, stretching plate assembly 423 and other structures to return to their original positions. Compared to existing technologies that use a drive source located on the back of the slide plate and then two independent locking cylinders to seal the slide plate using a point locking method, requiring cumbersome steps of "pressing down → positioning → locking → blowing air → unlocking → rising," which increases non-production time, the tension cylinder 413 of this application directly provides sufficient pressure-holding sealing force. This not only allows the downward pressure of the tension cylinder 413 to cancel out the expansion force of the mold on the same vertical plane, resulting in a lever arm of almost zero, but also means that the C-shaped sealing slide plate 411 no longer bears bending moment, only pure pressure, thus completely eliminating the risk of leakage caused by warping of the C-shaped sealing slide plate 411. Furthermore, it eliminates the need for independent mechanical locking / unlocking steps, shortens the molding cycle, and directly increases hourly output.

[0025] As one embodiment of the present invention, refer to Figure 5 The frame 2 is equipped with a mold closing device 5, which includes two symmetrically placed mold closing cylinders 51; each of the two symmetrically placed mold closing cylinders 51 has a template 52 fixedly installed on its movable end, and the two templates 52 are driven by the corresponding mold closing cylinders 51; a rectangular plate 53 is installed on the side wall of each mold closing cylinder 51, the rectangular plate 53 has a groove 54, two sensors 55 are installed in the groove 54, a guide rod 56 is installed on the template 52, and a sensing ring 57 is installed at the end of the guide rod 56 away from the template 52; When the preform in the heating device is transferred to the bottom of the mold closing device 5, the mold closing cylinder 51 is driven synchronously to move the template 52 towards each other to achieve rapid mold closing. The turntable template 3 is driven to move down so that the preform enters the bottle cavity. Then the blow molding and stretching device 4 is started to form the preform. After the bottle is formed, the mold closing cylinders 51 on both sides retract synchronously in the opposite direction, and the template 52 is completely retracted to both sides, exposing the finished bottle in the center to the open space for subsequent processes. During the process of the two templates 52 moving towards the center at the same time, the sensing ring on the guide rod 56 moves above the two sensors 55. When the mold is closed, the template 52 drives the guide rod 56 to move forward, and the sensing ring 57 approaches the front sensor 55. After receiving the signal, the system determines that the template 52 has closed or is about to close, and thus instructs the hydraulic cylinder to switch from "rapid advance" to "low pressure mold protection" or "high pressure locking" state.

[0026] When the mold opens, the sensing ring 57 retracts and triggers the rear sensor 55, and the system commands the cylinder to stop moving. By adjusting the position of the sensor 55 through the slide 54, the invalid mold opening distance (i.e., only opening to the position where the bottle can be picked up) can be avoided, thereby shortening the empty cycle time and improving production efficiency. At the same time, the horizontal space on both sides of template 52 is completely released, which allows for the installation of ultra-wide molds (such as multi-cavity side-by-side molds) with physical dimensions exceeding the lateral space occupied by the hydraulic cylinder on smaller tonnage machines, greatly improving the equipment's compatibility with irregular and large molds. In contrast to the existing technology's "one-movement-one-fixed" + clamping rod mode, this application's two side mold plates 52 move towards each other simultaneously. While maintaining the same movement speed of a single hydraulic cylinder, the relative speed of mold closing / opening is doubled. Alternatively, while keeping the cycle time the same, the hydraulic cylinder movement speed can be reduced, resulting in smoother and quieter operation. Both molds reach the center simultaneously, clamping rather than pushing the preform in the middle. The preform experiences instantaneous force balance, eliminating lateral shear force and ensuring the coaxiality of the bottle wall thickness. Furthermore, it reduces interference and expands the open mold space, allowing for structural dimensions exceeding the lateral occupancy of the mold closing cylinder 51. The simplified structure eliminates the need for complex internal mechanical limiting structures to constrain the slider, facilitating easy placement and removal. It also shortens mold closing / opening time and improves production efficiency.

[0027] As one embodiment of the present invention, refer to Figures 6-7 The turntable template 3 has a turntable 31 at its center, and a turntable drive mechanism 32 is connected to the top of the turntable 31. The turntable drive mechanism 32 includes a mounting base 321 connected to the top surface of the turntable template 3. A servo motor 322 is connected to the top of the mounting base 321. A reducer 323, a spline 324, and a drive shaft 325 are arranged inside the mounting base 321. The output shaft of the servo motor 322 is connected to the reducer 323 and then connected to the drive shaft 325 through the spline 324. The bottom of the drive shaft 325 is connected to the center of the turntable 31. The rotation angle and rotation position of the turntable 31 are controlled by the servo motor 322. The spline 324 is an involute spline. Four sets of mold heads 38 are arranged at the bottom of the turntable 31, and the four sets of mold heads 38 form a rectangular frame. The frame 2, injection molding device, heating device, degumming device, turntable template 3, blow molding and stretching device 4, mold closing device 5, and turntable drive mechanism 32 are all located inside the machine housing 1. When it is necessary to rotate the die head 38 below the turntable 31 by 90°, the servo motor 322 installed on the top is started. After the torque is increased by the reducer 323, the torque can be efficiently and accurately transmitted to the transmission shaft 325 by utilizing the multi-tooth meshing, automatic centering and high load-bearing characteristics of the involute spline. This drives the turntable 31 to rotate smoothly around the central axis by 90°, and transports the workpieces on each die head 38 to the next process position. Compared to the existing technology that uses a long chain high-position layout of "servo motor 322 + reducer 323 + coupling", this application introduces an involute spline direct connection design. First, this design eliminates the bulky coupling, significantly reducing the vertical height of the drive head in the Z-axis direction, effectively avoiding the risk of spatial interference with the densely packed injection nozzles, tension cylinders, and other mechanisms above the turntable 31, and reserving valuable process clearance space for the compact integrated machine. Second, the direct connection of spline 324 greatly shortens the force transmission path, eliminating the elastic deformation and cumulative error generated by traditional couplings during emergency stops and starts, and significantly improving the overall rigidity of the transmission system. Finally, by utilizing the unique self-centering effect and multi-tooth surface contact characteristics of the involute spline, near-zero backlash rigid torque transmission is achieved, completely overcoming the transmission backlash and vibration easily generated by keyed connections or couplings, ensuring that every pulse command of the servo motor 322 can be accurately and without lag converted into the angular displacement of the turntable 31, thereby greatly improving the repeatability and operational stability of multi-station rotary positioning.

[0028] As one embodiment of the present invention, refer to Figure 1 and Figure 8It also includes a screw feeding device 6; the front of the frame 2 is provided with a screw feeding device 6, which is composed of a drive module 61 and a feeding module 62. The drive module 61 includes a cylinder body 611, a motor mounting base 612, a hydraulic motor 613, a front drive shaft 614, a cylinder piston 615, a rear drive shaft 616, and a rotary bearing 617; the cylinder body 611 is horizontally connected to the motor mounting base 612 and the hydraulic motor 613 in sequence, the front drive shaft 614 passes through the motor mounting base 612, and the rear drive shaft 616... A rotary bearing 617 is fitted onto the upper part of the motor mounting base 612, located on both sides of the motor mounting base 612; the hydraulic motor 613 is connected to the motor mounting base 612, and its drive end is connected to the front drive shaft 614 to drive the front drive shaft 614 to rotate; the hydraulic motor 613 is provided with two oil pipes 618; the hydraulic cylinder body 611 has a cavity inside, and a rear drive shaft 616 is arranged in the cavity, with a hydraulic cylinder piston 615 fitted on the outer surface of the rear drive shaft 616 and contacting the inner wall of the cavity; a rotary bearing 617 is fitted onto the rear drive shaft 616, located on both sides of the hydraulic cylinder piston 615. The cylinder body 611 is side-mounted; at the bottom of the cylinder body 611, on both sides of the cylinder piston 615, there are respectively a release port 6181 and an injection port 6182 connected to their respective oil pipes 618. The front drive shaft 614 passes through the cylinder body 611 and is splinedly connected to the rear drive shaft 616. The rear drive shaft 616 passes through the cylinder body 611 and is connected to the feeding module 62. The rear drive shaft 616 and the cylinder body 611 are connected by a cylinder connecting sleeve at the point where they pass through. The drive module 61 provides power to the feeding module 62. The outer surface of the front drive shaft 614 is fixed to the motor base. A rotary oil seal is connected to the inner surface of the 612 opening. A rotary oil seal is provided between the cylinder piston 615 and the inner wall of the cylinder body 611 and the outer surface of the rear drive shaft 616. A rotary oil seal is provided between the cylinder connecting sleeve and the outer surface of the rear drive shaft 616. The rear drive shaft 616 is connected to the screw 621 in the feeding module 62. The rear drive shaft 616 is H-shaped, with one end open and connected to the screw 621, and the other end open and splinedly connected to the front drive shaft 614, so that the front drive shaft 614 can extend into the rear drive shaft 616. The spline structure here is the same as the aforementioned spline 324. Solid plastic raw materials are continuously fed into the feeding module 62, where they are heated to a molten state and then transported to the injection molding device. To discharge the solid plastic raw materials, the hydraulic motor 613 in the drive module 61 needs to be started first. The drive end of the hydraulic motor 613 directly drives the front drive shaft 614 to rotate at high speed. The front drive shaft 614 is stably supported by the rotating bearings 617 on both sides in the motor mounting base 612, ensuring the smoothness of rotation. The front drive shaft 614 is connected to the rear drive shaft 616 through a spline. When the front drive shaft 614 rotates, the spline teeth mesh and drive the rear drive shaft 616 located in the cylinder chamber to rotate synchronously. The rear drive shaft 616 passes through the cylinder and is connected to the screw 621, driving the screw 621 to run inside the feeding module 62. The solid plastic raw materials are drawn in, melted in the feeding module 62, and transported to the injection molding device through the end of the feeding module 62. After pre-plasticization, the high-pressure oil pipe 618 controls the high-pressure oil to enter the cylinder body 611 through the injection port 6182, acting on the rear side of the cylinder piston 615 (the side away from the feeding module 62). The high-pressure oil pushes the cylinder piston 615, driving the rear drive shaft 616 and the front screw 621 to move forward in a straight line. The screw 621, like a syringe piston, pushes the molten plastic accumulated at the front of the feeding module 62 into the mold cavity of the injection molding device at high pressure and high speed. After injection, hydraulic oil can enter from the release port 6181, causing the piston to retract slightly, realizing the "reverse" action and preventing drooling from the end of the feeding module 62.

[0029] The injection molding and blow molding integrated machine of the present invention achieves efficient, precise and automated production from plastic granules to finished bottles through a four-station (injection, temperature control, blow molding, demolding) rotating structure and drive and transmission design. The injection device includes an injection seat that can move horizontally, and its front end is provided with a nozzle that matches the gate of the preform mold on the bottom die head 38 of the turntable 31. When the turntable 31 rotates to the injection station, the injection seat moves forward, and its nozzle aligns and presses with the preform mold on the die head 38. Then, the screw feeding device 6 injects molten plastic into the mold cavity to complete the injection molding of the preform. The heating device is located at the next station on the rotation path of the turntable 31. It is equipped with multiple sets of infrared heating lamps and a reflector. When the die head 38 carrying the preform rotates to this station, the heating device heats the preform in sections. By controlling the power and heating time of each set of lamps, the preform can achieve the temperature distribution required for stretch blow molding. The demolding device is located after the blow molding station and before the injection molding station. When the molded bottle rotates to this station with the mold head 38, the robot arm extends, its grippers grab the bottle body, and at the same time, the ejection mechanism (such as ejector pin) inside the mold head 38 actuates to smoothly remove the bottle from the mold core, thus completing the entire production cycle. Its complete workflow and the coordination principle of each key mechanism are as follows: Phase 1: Raw material plasticization and injection molding (working principle of screw feeding device 6); When the work begins, solid plastic raw materials are continuously fed into the screw feeding device 6 at the front of the frame 2; the hydraulic motor 613 in the drive module 61 is started, and its drive end directly drives the front drive shaft 614 to rotate at high speed in the motor fixed base 612 (stable support is provided by the two side rotary bearings 617); the front drive shaft 614 is connected to the rear drive shaft 616 located inside the hydraulic cylinder through a spline, and by utilizing the axial sliding characteristics of the spline, the rear drive shaft 616 and the front feeding module 62 (screw 621) are driven to rotate synchronously; After pre-plasticization, the hydraulic system controls high-pressure oil to enter the cylinder chamber through the injection port 6182 and act on the rear side of the cylinder piston 615. The piston pushes the rear drive shaft 616 and screw 621 to move forward in a straight line like a syringe, injecting the molten plastic into the mold cavity of the injection molding device at high pressure and high speed to form a preform.

[0030] Phase 2: Workstation Flow and Precise Positioning (Working Principle of Turntable Drive Mechanism 32). After injection molding is completed, the preform is attached to the die head 38 at the bottom of the turntable 31; at this time, the turntable template 3 above the frame 2 drives the turntable 31 assembly to rise as a whole, so that the die head 38 is separated from the cavity. The servo motor 322 located at the top starts, and after the torque is increased by the reducer 323, the torque is transmitted to the transmission shaft 325 through the involute spline 324, which drives the turntable 31 to rotate smoothly around the central axis by 90°, and transports the injection-molded preform to the heating device, and then transports the heated preform to the blow molding and stretching device 4.

[0031] Third stage: Bidirectional synchronous mold closing (working principle of mold closing device 5); When the heated preform is transferred to the blow molding station (mold closing device 5) directly below, the turntable template 3 moves down into place; the mold closing cylinders 51 placed symmetrically on both sides of the frame 2 start synchronously, driving the two templates 52 and the mold to move towards each other; during this process, the guide rod 56 installed on the template 52 carries the sensing ring 57 and moves above the two sensors 55 on the rectangular plate 53 on the side wall of the cylinder. When the sensing ring 57 approaches the front sensor 55, the system determines that the mold is about to close and instructs the mold closing cylinder 51 to smoothly switch from "rapid advance" to "low pressure mold protection" and "high pressure locking" states, ultimately encasing the preform in the mold cavity.

[0032] Phase 4: High-rigidity sealing and stretch blow molding (working principle of blow molding stretch device 4). After the mold is closed, the blow molding stretching device 4 immediately activates; it synchronously drives the stretching cylinders 413 at both ends of the top, causing the C-shaped sealing slide plate 411 to move down along the four stretching guide rods 41; the sealing plate 414 at the bottom of the C-shaped sealing slide plate 411 presses the mold bottle mouth.

[0033] Fifth stage: Mold opening and resetting; After the blow molding process is completed and the air is vented, the second stretching cylinder 422 and the first stretching cylinder 413 retract in sequence, driving the core rod and sealing device to reset; subsequently, the two mold closing cylinders 51 retract in opposite directions simultaneously, and the template 52 completely retracts to both sides.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight bidirectional injection molding and blow molding integrated machine for use in the plastic waste recycling industry, comprising a frame (2), an injection molding device, a heating device, and a degumming device, characterized in that: A turntable template (3) is set above the frame (2), and a blow molding stretching device (4) is set on the turntable template (3). The blow molding stretching device (4) includes four stretching guide rods (41). The four stretching guide rods (41) pass through the four corner points of the C-shaped sealing slide plate (411). The bottom of the stretching guide rod (41) is fixedly connected to the turntable template (3), and the top is fixedly connected to a stretching mounting plate (412). Each end of the top surface of the stretching mounting plate (412) is fixedly installed with a stretching cylinder (413). The movable end of the stretching cylinder (413) passes through the stretching mounting plate (412) and is fixedly connected to the C-shaped sealing slide plate (411), and is located between the two stretching guide rods (41). The bottom of the C-shaped sealing slide plate (411) is connected to a sealing plate (414). A rectangular mounting plate (42) is located in the space enclosed by the four stretching guide rods (41). Fixed rods (421) are fixedly connected to the four corners of the rectangular mounting plate (42). The other end of the fixed rods (421) is fixedly connected to the C-shaped sealing slide plate (411). A second stretching cylinder (422) is fixedly installed on the rectangular mounting plate (42). The movable end of the second stretching cylinder (422) passes through the rectangular mounting plate (42) and connects to the stretching plate assembly (423). A plurality of stretching core rods (424) are fixedly connected to the bottom of the stretching plate assembly (423). The stretching core rods (424) correspond one-to-one with the inner holes of the preform on the sealing plate (414). A plurality of air blowing connectors are provided on one side of the sealing plate (414). The end of each air blowing connector communicates with the inner hole of the preform and is connected to an external air source. The stretch mounting plate (412) has a groove in the middle, which is used to prevent the stretch cylinder (422) from being obstructed in the vertical direction during the bottle blowing process; the C-shaped sealing slide plate (411) is inverted step shape.

2. The lightweight bidirectional injection molding blow molding machine according to claim 1, characterized in that: Guide rods (425) are fixedly connected to the tension plate assembly (423) on both sides of the movable end of the tension cylinder (422). The other end of the guide rods (425) passes through the rectangular mounting plate (42) and is slidably connected to it.

3. The lightweight bidirectional mold-closing injection blow molding machine according to claim 1, characterized in that: A mold clamping device (5) is provided on the frame (2). The mold clamping device (5) includes two symmetrically placed mold clamping cylinders (51). Each of the two symmetrically placed mold clamping cylinders (51) has a template (52) fixedly installed on its movable end. The two templates (52) are driven by the corresponding mold clamping cylinders (51). A rectangular plate (53) is installed on the side wall of each mold clamping cylinder (51). The rectangular plate (53) has a groove (54). Two sensors (55) are installed in the groove (54). A guide rod (56) is installed on the template (52). A sensing ring (57) is installed at the end of the guide rod (56) away from the template (52).

4. The lightweight bidirectional mold-closing injection blow molding machine according to claim 1, characterized in that: The turntable template (3) has a turntable (31) at its center. The top of the turntable (31) is connected to a turntable drive mechanism (32). The turntable drive mechanism (32) includes a mounting base (321) connected to the top surface of the turntable template (3). The top of the mounting base (321) is connected to a servo motor (322). The mounting base (321) contains a reducer (323), a spline (324), and a drive shaft (325). The output shaft of the servo motor (322) is connected to the reducer (323) and then connected to the drive shaft (325) through the spline (324). The bottom of the drive shaft (325) is connected to the center of the turntable (31). The servo motor (322) controls the rotation angle and rotation position of the turntable (31).

5. A lightweight bidirectional injection molding blow molding machine according to claim 1, characterized in that: It also includes a screw feeding device (6); the front of the frame (2) is provided with a screw feeding device (6), which is composed of a drive module (61) and a feeding module (62). The drive module (61) includes a cylinder body (611), a motor mounting base (612), a hydraulic motor (613), a front drive shaft (614), a cylinder piston (615), a rear drive shaft (616), and a rotary bearing (617); the cylinder body (611) and the screw feeding device (612) are also provided with a screw feeding device (613). The motor mounting base (612) and the hydraulic motor (613) are horizontally connected in sequence. The front drive shaft (614) passes through the motor mounting base (612). A rotary bearing (617) is sleeved on the rear drive shaft (616), which is located on both sides of the motor mounting base (612). The hydraulic motor (613) is connected to the motor mounting base (612), and its drive end is connected to the front drive shaft (614) to drive the front drive shaft (614) to rotate. (613) is provided with two oil pipes (618); the cylinder body (611) has a cavity inside, and a rear drive shaft (616) is provided in the cavity. A cylinder piston (615) is sleeved on the outer surface of the rear drive shaft (616) and contacts the inner wall of the cavity; a rotary bearing (617) is sleeved on the rear drive shaft (616) and is located on both sides of the cylinder piston (615); the bottom of the cylinder body (611) is provided with two oil pipes (618) on both sides of the cylinder piston (615) respectively. The oil pipe (618) is connected to the oil release port (6181) and the oil injection port (6182). The front drive shaft (614) passes through the cylinder body (611) and is splined to the rear drive shaft (616). The rear drive shaft (616) passes through the cylinder body (611) and is connected to the feeding module (62). The connection between the rear drive shaft (616) and the cylinder body (611) is made by a cylinder connecting sleeve. The drive module (61) provides power to the feeding module (62).

6. The lightweight bidirectional mold-closing injection blow molding machine according to claim 5, characterized in that: The outer surface of the front drive shaft (614) is connected to the inner surface of the opening of the motor mounting base (612) by a rotary oil seal. A rotary oil seal is provided between the cylinder piston (615) and the inner wall of the cylinder body (611) and the outer surface of the rear drive shaft (616). A rotary oil seal is provided between the cylinder connecting sleeve and the outer surface of the rear drive shaft (616).

7. A lightweight bidirectional injection molding blow molding machine according to claim 4, characterized in that: The spline (324) is an involute spline.

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