A finishing device for producing PET bottle preforms

Abstract

The utility model relates to a kind of arrangement device for PET bottle blank production. Including support, one end high one end low bottle sorting hopper box is installed on it, bottle sorting hopper box cover is pivotally connected on bottle sorting hopper box, bottle inlet is set in the high end of bottle sorting hopper box cover, two bottle falling baffles are set in the inner chamber of bottle sorting hopper box;Bottle sorting roller assembly and bottle pushing wheel assembly are set in the inner chamber of bottle sorting hopper box;Bottle sorting roller assembly includes two bottle sorting rollers rotationally connected at the lower end strip-shaped discharge port of bottle sorting hopper box, two bottle sorting rollers are oppositely arranged and spacing is adjustable;It further includes bottle sorting motor, adjustable transmission mechanism is installed between the output shaft of bottle sorting motor and two bottle sorting rollers.The utility model has effectively prevent dust and particles in production environment from falling into bottle blank, avoid product pollution;At the same time, the spacing of bottle sorting roller is adjustable, can be adapted to different specifications size PET bottle blank, without stopping machine to replace component, improve the versatility and production continuity of equipment.

Description

Technical Field

[0001] This utility model belongs to the technical field of blow molding production equipment, and in particular relates to a finishing device for PET preform production. Background Technology

[0002] Injection blow molding, a core process for manufacturing hollow plastic products, involves injecting molten plastic into a mold through an injection molding machine to form a preform, which is then transferred to a blow molding process to complete the final shape. This process has significant advantages such as high dimensional accuracy, no need for secondary processing of the parts, good weight stability, no scrap or flash residue, and excellent appearance quality. It is widely used in the production of polystyrene bottles, polypropylene copolymer bottles, and polyethylene bottles.

[0003] In the blow molding production line, the conveying and sorting of preforms is crucial, and it usually relies on a plastic preform loading and sorting device. This device consists of a preform lifting machine and a preform sorting machine working together: the preform lifting machine is responsible for conveying the preforms to the preform sorting machine, and the preform sorting machine orients and arranges the disordered preforms to ensure that they enter the subsequent blow molding process in an orderly manner.

[0004] However, existing preform handling devices have significant drawbacks: the upper structure of the preform handling chamber is completely open, and the preforms face upwards during the handling process, making it easy for dust, particles, or other foreign objects from the production environment to fall into the preforms. These contaminants, once in the blow molding process, directly contaminate the product's internal cavity, causing quality defects or even batch scrapping. Furthermore, the dimensions of the preform channel used to guide the preforms in traditional devices are fixed and cannot be adjusted. When producing PET preforms of different sizes, this design cannot be flexibly adapted, requiring machine shutdown for component replacement or cumbersome adjustments. This severely restricts the equipment's versatility and production continuity, increasing operational complexity and production costs. Therefore, there is an urgent need to design a handling device for PET preform production to solve these problems. Summary of the Invention

[0005] This invention provides a reasonably designed sorting device for PET preform production to solve the technical problems existing in the prior art. This invention effectively prevents dust and particles from the production environment from falling into the preform, avoiding product contamination; at the same time, the spacing between the sorting rollers is adjustable, adaptable to PET preforms of different sizes, eliminating the need to stop the machine to replace parts, thus improving the equipment's versatility and production continuity.

[0006] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is as follows: A sorting device for PET preform production includes a support frame, on which a bottle-sorting hopper box with one end higher than the other is mounted. A bottle-sorting hopper box cover is pivotally connected to the top opening of the bottle-sorting hopper box. A bottle inlet is opened at the high end of the bottle-sorting hopper box cover. Two bottle-dropping baffles corresponding to the bottle inlet are provided in the inner cavity of the bottle-sorting hopper box. The two bottle-dropping baffles are arranged opposite each other, and a channel for several PET preforms to pass through is left between them. A bottle-sorting roller assembly is provided in the inner cavity of the bottle-sorting hopper box for arranging several PET preforms into an array; and also includes... The device includes a bottle-dispensing wheel assembly installed at the lower end of the inner cavity of the bottle-dispensing hopper box, located above the bottle-dispensing roller assembly; the bottle-dispensing roller assembly includes two bottle-dispensing rollers rotatably connected to and parallel to the elongated discharge port at the lower end of the bottle-dispensing hopper box, the two bottle-dispensing rollers being arranged opposite each other with an adjustable gap, the gap between the two bottle-dispensing rollers being greater than the outer diameter of the PET bottle preform tube body and less than the outer diameter of the PET bottle preform tube opening; it also includes a bottle-dispensing motor installed on the bottle-dispensing hopper box, an adjustable transmission mechanism installed between the output shaft of the bottle-dispensing motor and the two bottle-dispensing rollers, used to drive the two bottle-dispensing rollers to rotate synchronously in opposite directions and ensure that the gap between them is adjustable.

[0007] The advantages and positive effects of this utility model are as follows: This utility model provides a sorting device for PET preform production. By covering the top opening of the sorting box with a bottle-sorting box cover and setting a high-end bottle inlet, combined with the controllable channel formed by the bottle-dropping baffle, the intrusion of dust and particles is effectively blocked. At the same time, the adjustable spacing of the sorting rollers allows the equipment to flexibly adapt to the production needs of PET preforms of different specifications without stopping the machine for adjustment. It effectively prevents dust and particles in the production environment from falling into the preform, avoiding product contamination. In addition, the adjustable spacing of the sorting rollers can adapt to PET preforms of different specifications and sizes without stopping the machine to replace parts, thus improving the equipment's versatility and production continuity.

[0008] Preferably, the adjustable transmission mechanism includes adjusting grooves that span the lower elongated discharge port of the bottle-scraping hopper, both on the high-end and low-end surfaces of the hopper. Adjustable bottle-scraping shaft seats one and two are threaded through each adjusting groove. Two bottle-scraping rollers are rotatably connected between the two bottle-scraping shaft seats one and two bottle-scraping shaft seats two, respectively. A synchronous pulley one is keyed to the outer end of one bottle-scraping roller, and a synchronous pulley two is keyed to the outer end of the other bottle-scraping roller. The mechanism also includes a tension adjusting seat mounted on the high-end surface of the bottle-scraping hopper, with a tensioning screw screwed onto it. A handle is mounted on the outer end of the tensioning screw, and a tensioning wheel seat is movably connected to its inner end. A tensioning pulley is rotatably connected to the tensioning wheel seat. The mechanism also includes a drive pulley keyed to the output shaft of the bottle-scraping motor. Finally, it includes a transmission belt connected to each pulley, with synchronous pulley one and synchronous pulley two located on the inner and outer sides of the transmission belt, respectively.

[0009] Preferably, a through groove extending along its length is provided in the adjusting slide groove opened on the high end surface of the bottle feeding hopper box, and the shaft of the bottle feeding roller passes through the through groove and is rotatably connected to the corresponding bottle feeding shaft seat; each adjusting slide groove is provided with a strip hole extending along its length, and each bottle feeding shaft seat is locked to the bottle feeding hopper box by bolts and lock nuts passing through the strip holes.

[0010] Preferably, the bottle-dispensing wheel assembly includes a bottle-dispensing motor mounted on the bottle-scraping hopper, a bottle-dispensing shaft rotatably connected to the output shaft of the bottle-dispensing motor, the bottle-dispensing shaft spanning the elongated discharge port at the lower end of the bottle-scraping hopper, and a bottle-dispensing wheel mounted on the bottle-dispensing shaft.

[0011] Preferably, the bottle-dispensing wheel includes a sleeve with a through hole extending radially thereon. The bottle-dispensing shaft and the bottle-dispensing wheel are connected by bolts passing through the through hole. Several blades evenly distributed along the circumference are fixed to the outer peripheral wall of the sleeve.

[0012] Preferably, the bottle-scraping hopper includes an inclined and parallel high baffle and a low baffle fixed to a support, with the high baffle positioned higher than the low baffle. A hopper rear side plate and a hopper front side plate are fixed between the high baffle and the low baffle. The lower ends of the hopper rear side plate and the hopper front side plate are bent inward to form a guide section. The lower edges of the two guide sections are fitted together to form a long strip-shaped discharge port at the lower end of the bottle-scraping hopper. A bottle outlet corresponding to the long strip-shaped discharge port is provided at the lower part of the low baffle. The two bottle-scraping rollers in the bottle-scraping roller assembly are located below the two guide sections and fitted together with them.

[0013] Preferably, the bottle drop baffle is shaped like a winnowing basket and its bottom surface is inclined, with the inclination direction gradually moving inward from top to bottom. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the main body of this utility model; Figure 3 This is a three-dimensional structural diagram of the adjustable transmission mechanism in this utility model.

[0015] In the diagram: 1. Support frame; 2. Bottle-scrambling roller assembly; 2-1. Bottle-scrambling motor; 2-2. Adjustable transmission mechanism; 2-2-1. Drive pulley; 2-2-2. Transmission belt; 2-2-3. Tensioning pulley; 2-2-4. Tensioning pulley seat; 2-2-5. Tensioning adjustment seat; 2-2-6. Tensioning screw; 2-2-7. Adjusting slide; 2-2-8. Bottle-scrambling shaft seat one; 2-2-9. Synchronous pulley one; 2-2-1 0. Synchronous pulley II; 2-2-11. Bottle-scraping shaft seat II; 2-3. Bottle-scraping roller; 3. Bottle drop baffle; 4. Bottle inlet; 5. Bottle-scraping box cover; 6. Bottle-scraping hopper box; 6-1. High baffle; 6-2. Rear side plate of hopper; 6-3. Guide section; 6-4. Low baffle; 6-5. Front side plate of hopper; 7. Bottle-dispatching wheel assembly; 7-1. Dispatching wheel motor; 7-2. Bottle-dispatching roller; 7-3. Bottle-dispatching shaft; 8. PET preform. Detailed Implementation

[0016] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided in detail: Please see Figure 1 The sorting device for PET preform production of this utility model includes a support 1, on which a bottle sorting hopper 6 with one end higher than the other is installed. A bottle sorting hopper cover 5 is pivotally connected to the top opening of the bottle sorting hopper 6. A bottle inlet 4 is opened at the high end of the bottle sorting hopper cover 5. Two bottle drop baffles 3 corresponding to the bottle inlet 4 are provided in the inner cavity of the bottle sorting hopper 6. The two bottle drop baffles 3 are arranged opposite to each other and a channel is left between them for several PET preforms 8 to pass through. The inner cavity of the bottle feeding hopper box 6 is provided with a bottle feeding roller assembly 2 for arranging a number of PET preforms 8 into an array; it also includes a bottle-pushing wheel assembly 7 installed at the lower end of the inner cavity of the bottle feeding hopper box 6 and located above the bottle feeding roller assembly 2. like Figure 2 As shown, the bottle-scraping roller assembly 2 includes two bottle-scraping rollers 2-3 rotatably connected to and parallel to the elongated discharge port at the lower end of the bottle-scraping hopper box 6. The two bottle-scraping rollers 2-3 are arranged opposite each other and the distance between them is adjustable. The distance between the two bottle-scraping rollers 2-3 is greater than the outer diameter of the tube body of the PET bottle preform 8 and less than the outer diameter of the tube opening of the PET bottle preform 8. It also includes a bottle-scraping motor 2-1 installed on the bottle-scraping hopper box 6. An adjustable transmission mechanism 2-2 is installed between the output shaft of the bottle-scraping motor 2-1 and the two bottle-scraping rollers 2-3 to drive the two bottle-scraping rollers 2-3 to rotate synchronously in opposite directions and to ensure that the distance between them is adjustable.

[0017] like Figure 3As shown, the adjustable transmission mechanism 2-2 includes an adjusting groove 2-2-7 spanning the lower elongated discharge port of the bottle-scraping hopper 6, which is opened on both the high-end and low-end surfaces of the hopper 6. This groove provides a stable moving path for the bottle-scraping shaft seats, ensuring the accuracy of the spacing adjustment. Adjustable bottle-scraping shaft seats 1 2-2-8 and 2-2-11 are inserted into each adjusting groove 2-2-7. Two bottle-scraping rollers 2-3 are rotatably connected between the two bottle-scraping shaft seats 1 2-2-8 and the two bottle-scraping shaft seats 2-2-11, respectively. A timing pulley 2-2-9 is keyed to the outer end of one bottle-scraping roller 2-3, and a timing pulley 2-2-10 is keyed to the outer end of the other bottle-scraping roller 2-3. The system also includes a tension adjustment seat 2-2-5 mounted on the high-end surface of the bottle-scraping hopper 6, with a tension screw 2-2-6 screwed onto it. A handle is mounted on the outer end of the tension screw 2-2-6, and a tension wheel seat 2-2-4 is movably connected to its inner end. A tension pulley 2-2-3 is rotatably connected to the tension wheel seat 2-2-4. The system also includes a drive pulley 2-2-1 keyed to the output shaft of the bottle-scraping motor 2-1. Furthermore, the system includes a transmission belt 2-2-2 connected to each pulley, with timing pulley 2-2-9 and timing pulley 2-2-10 located on the inner and outer sides of the transmission belt 2-2-2, respectively.

[0018] In practical applications, the tension adjustment seat 2-2-5 refers to the fixed bracket installed on the high-end surface of the bottle hopper box 6. It can be made of a metal plate with threaded holes, and its purpose is to provide an installation base for the tension screw 2-2-6. The design of the tension screw 2-2-6 realizes the fine-tuning movement of the tension wheel seat 2-2-4 through threaded transmission. It can adopt a trapezoidal thread or ball thread structure, with the aim of precisely controlling the tension of the transmission belt 2-2-2 and avoiding transmission failure caused by changes in the belt pitch.

[0019] Specifically, the above setup, through the adjustment of the sliding groove 2-2-7 in conjunction with the bottle-scraping shaft seat 1 2-2-8 and bottle-scraping shaft seat 2-2-11, achieves flexible adjustment of the distance between the two bottle-scraping rollers 2-3. This design is directly related to the geometric features of the preform channel, ensuring precise matching of preforms of different sizes within the channel. Synchronous pulleys 1 2-2-9 and 2 2-2-10 are keyed to the outer ends of the two bottle-scraping rollers 2-3, firmly connecting the transmission system to the rollers and ensuring the synchronicity of their opposite rotation, thus stably pushing the preforms. The coordinated design of the tension adjustment seat 2-2-5 and the tension screw 2-2-6 drives the tension wheel seat 2-2-4 to move by rotating the screw, utilizing the fine-tuning characteristics of the thread to achieve precise control of the tension of the transmission belt 2-2-2. Simultaneously, the addition of an outer handle enhances ease of operation. The connection layout of the drive belt 2-2-2 and the pulleys, especially the configuration of synchronous pulley 1 2-2-9 and synchronous pulley 2-2-10 located on the inner and outer sides of the belt respectively, forms a unique winding path. This ensures that the two rollers rotate in opposite directions under the drive of the motor, effectively preventing the preforms from shifting in the channel. Overall, this mechanism, through the integration of the adjusting groove 2-2-7, the adjustable shaft seat, and the tensioning system, significantly improves the versatility and operational efficiency of the device, solving the technical problem of traditional bottle handling devices being unable to quickly switch between preforms of different sizes.

[0020] like Figure 3 As shown, an adjustment groove 2-2-7 is provided on the high-end surface of the bottle feeding hopper box 6, and a through groove extending along its length is provided. The shaft of the bottle feeding roller 2-3 passes through the through groove and is rotatably connected to the corresponding bottle feeding shaft seat. Each adjustment groove 2-2-7 is provided with a strip-shaped hole extending along its length. Each bottle feeding shaft seat is locked to the bottle feeding hopper box 6 by bolts and lock nuts passing through the strip-shaped holes.

[0021] Specifically, the adjusting chute 2-2-7 refers to a long chute with a specific internal structure design, which can be formed by machining metal sheet and integrated into the high-end surface of the bottle-scraping hopper box 6. In practical applications, the through groove refers to a through slot opened along the length of the adjusting chute 2-2-7, the purpose of which is to provide a through channel for the shaft of the bottle-scraping roller 2-3, ensuring that the shaft can move smoothly. The strip hole is a long hole structure extending along the length of the adjusting chute 2-2-7, which can be formed by machining, and its main function is to provide guidance and limit for the position adjustment of the bottle-scraping shaft seat.

[0022] In detail, the above-mentioned setup achieves precise control over the spacing of the bottle-scraping rollers 2-3 by optimizing the internal structural design of the adjusting chute 2-2-7. The through-groove design allows the shaft of the bottle-scraping roller 2-3 to move smoothly along a straight trajectory within the chute, avoiding offset or jamming caused by external forces. The use of strip holes in conjunction with bolts and lock nuts not only allows the bottle-scraping shaft seat to slide freely within a preset range to achieve spacing adjustment, but also ensures the stability of the adjusted position through a tightening action. This structural design, combined with the overall structure of the bottle-scraping hopper box 6, significantly improves the device's adaptability to bottle preforms of different sizes. Through the above technical solution, the problems of insufficient shaft connection stability and adjustment accuracy are effectively solved, enabling the device to reliably complete the bottle-scraping operation of various specifications of bottle preforms.

[0023] like Figure 2 As shown, the bottle-dispensing wheel assembly 7 includes a bottle-dispensing motor 7-1 mounted on the bottle-scraping hopper box 6, a bottle-dispensing shaft 7-3 rotatably connected to the output shaft of the bottle-dispensing motor 7-1, the bottle-dispensing shaft 7-3 spanning the elongated discharge port at the lower end of the bottle-scraping hopper box 6, and a bottle-dispensing wheel 7-2 mounted on the bottle-dispensing shaft 7-3.

[0024] Specifically, the bottle-feeding wheel assembly 7 refers to a device that actively feeds the bottle preform through mechanical transmission. It can be implemented using a motor drive in conjunction with rotating paddles. The wheel motor 7-1 is the core component providing the power source; it can be a stepper motor or servo motor, a type of motor with high controllability, to ensure precise control of the speed and start / stop of the bottle-feeding action. The bottle-feeding shaft 7-3, as a key component for power transmission, can be a cylindrical shaft structure made of metal, designed to smoothly and reliably transmit the motor's power to the bottle-feeding wheel 7-2. The bottle-feeding wheel 7-2 is the actuator that directly acts on the bottle preform; it can be a disc structure with paddles, designed to actively push the bottle preform forward through rotational motion.

[0025] In detail, the above setup, by installing a rotary motor 7-1 on the bottle-feeding hopper 6, provides a stable and reliable power source for the entire bottle-feeding process. This eliminates the reliance on the preform's own weight or external thrust, thus achieving active control over the preform conveying process. The connection between the output shaft of the rotary motor 7-1 and the bottle-feeding shaft 7-3 ensures efficient power transmission. Simultaneously, the design of the bottle-feeding shaft 7-3 spanning the entire discharge port allows the bottle-feeding roller 7-2 to evenly apply force to all passing preforms, effectively preventing jamming caused by uneven local force. Furthermore, the rotational motion of the bottle-feeding roller 7-2 overcomes the problem of preforms stagnating at the discharge port due to insufficient weight or excessive friction, ensuring continuous and stable passage of preforms through the discharge port. This not only solves the problem of preform accumulation and jamming at the discharge port but also significantly improves the efficiency and stability of the bottle-feeding process, providing strong support for continuous production in subsequent processes.

[0026] like Figure 2 As shown, the bottle-dispensing wheel 7-2 includes a sleeve with a through hole extending radially thereon. The bottle-dispensing shaft 7-3 and the bottle-dispensing wheel 7-2 are connected by bolts passing through the through hole. Several blades evenly distributed along the circumference are fixed to the outer peripheral wall of the sleeve.

[0027] In practical applications, the sleeve component serves as the basic carrier for the bottle-dispatching roller 7-2. It can be made of metal or high-strength plastic and aims to provide an adjustable mounting platform for the roller. The through-hole design refers to a through hole formed radially along the sleeve component. This hole can be circular, elliptical, or other bolt-compatible shapes, allowing the bolt to move freely within it for position adjustment. Specifically, the blades can be fixed by welding, threaded connection, or integral molding, ensuring even force distribution when dispatching the preforms. In particular, this design achieves flexible axial position adjustment of the bottle-dispatching roller 7-2 through the adjustable connection between the sleeve component and the dispatching shaft 7-3. Based on this design, operators can quickly change the position of the bottle-dispatching roller 7-2 by loosening the bolts, thus adapting to the conveying needs of PET preforms 8 of different diameters. Furthermore, this structural design significantly improves the device's compatibility with various preform sizes, ensuring the continuity and reliability of the handling process. The above technical solutions not only solve the problem of jamming or damage caused by traditional fixed structures, but also greatly improve sorting efficiency and product quality.

[0028] like Figure 2As shown, the bottle-scraping hopper box 6 includes an inclined and parallel high baffle 6-1 and a low baffle 6-4 fixed to the support 1, with the high baffle 6-1 positioned higher than the low baffle 6-4. A hopper rear side plate 6-2 and a hopper front side plate 6-5 are fixed between the high baffle 6-1 and the low baffle 6-4 and are arranged opposite to each other. The lower ends of the hopper rear side plate 6-2 and the hopper front side plate 6-5 are both bent inward to form a guide part 6-3. The lower edges of the two guide parts 6-3 are fitted together to form a long strip-shaped discharge port at the lower end of the bottle-scraping hopper box 6. A bottle outlet corresponding to the long strip-shaped discharge port is opened at the lower part of the low baffle 6-4. The two bottle-scraping rollers 2-3 in the bottle-scraping roller assembly 2 are located below the two guide parts 6-3 and are fitted together with them.

[0029] In practical applications, the high baffle 6-1 and the low baffle 6-4 refer to the two main side wall components that form the main structure of the bottle feeding hopper 6. They can be made of sheet metal through stamping or welding. The inclined and parallel design aims to guide the preforms to slide towards the lower end using the natural slope created by the height difference, reducing manual intervention and random stacking. The rear side plate 6-2 and the front side plate 6-5 of the hopper can be understood as connectors connecting the high baffle 6-1 and the low baffle 6-4. Their lower ends are bent inward to form the guide section 6-3. This structural design allows the discharge channel to gradually narrow, forcing the preforms to be arranged in a single row. The lower edge clearance fit of the guide section 6-3 refers to maintaining a precise distance between the two guide sections 6-3. This can be achieved through precision machining or adjustment mechanisms to ensure that the width of the discharge port can be finely adjusted to accommodate the passage requirements of preforms of different sizes.

[0030] The corresponding arrangement of the bottle outlet and the elongated discharge port ensures that the sorted preforms can be smoothly output to the next process. The bottle sorting roller 2-3 is located below the guide section 6-3 and is fitted with it with a clearance. This positional relationship allows the preforms to slide directly from the discharge port into the space between the rollers. The synchronous rotation of the rollers enables precise clamping and arrangement, thereby improving the overall versatility and reliability of the device.

[0031] like Figure 2 As shown, the bottle drop baffle 3 is shaped like a winnowing basket and its bottom surface is inclined, with the inclination direction gradually moving inward from top to bottom.

[0032] Specifically, the bottle drop baffle 3 refers to a guiding structure with curved surface coverage, which can be achieved by stamping metal sheets or injection molding engineering plastics. The purpose of this design is to reduce the exposed open area above the channel by optimizing the geometry, thereby limiting dust from falling directly in from directly above. The inclined bottom design can be understood as a progressive shielding barrier, its purpose being to dynamically narrow the channel width and prevent foreign objects from falling vertically into the preform with the bottle opening facing upwards.

[0033] In detail, the scoop-shaped design of the bottle drop baffle 3 effectively shields the open area above the preform channel. This curved coverage not only maintains the orderly passage of preforms but also ensures the cleanliness of the preforms' interior during the finishing stage. The gradually inward-sloping bottom surface creates a progressive narrowing effect as the preform moves downward from the inlet 4, forming an effective barrier at the bottle mouth. This structural design protects the preform channel through its own shape and, together with the channel formed by the inlet 4 and the two bottle drop baffles 3, ensures the cleanliness of the preforms during transport, providing a reliable quality foundation for subsequent blow molding processes.

[0034] The bottle-scrambling roller 2-3 includes a shaft that is rotatably connected to the corresponding bottle-scrambling shaft seat via a rolling bearing, and a roller sleeve made of rubber is fitted on the shaft.

[0035] Specifically, the bottle-sorting rollers 2-3 are key components used for conveying and arranging PET preforms 8. In practical applications, the rolling bearings can be implemented using deep groove ball bearings or ball bearings, the purpose of which is to ensure smooth rotation of the shaft and reduce frictional resistance, thereby avoiding preform jamming caused by poor rotation. The roller sleeve refers to the protective layer and contact surface sleeved on the outside of the shaft. It can be made of natural rubber, silicone, or other materials with a high coefficient of friction and elasticity. Its purpose is to provide sufficient friction to prevent preform slippage, while using its softness to protect the preform surface from damage. As the part that directly contacts the PET preform 8, the choice of rubber material for the roller sleeve is particularly critical. Because rubber has good elasticity and softness, it can produce appropriate deformation when in contact with the preform, thereby avoiding scratches or deformation that may be caused by hard materials. In addition, the high coefficient of friction allows the preforms to be reliably conveyed and arranged between the rollers, significantly improving the sorting efficiency. Furthermore, the replaceable design of the roller sleeve further enhances the ease of maintenance of the device, making it adaptable to the sorting needs of preforms of different sizes or materials.

[0036] Working principle: The bracket 1 serves as the basic support structure, used to fix and stabilize the entire device. The bottle-sorting hopper 6 is tilted, with one end higher than the other, using gravity to guide the PET preforms 8 to slide towards the lower end, thereby improving sorting efficiency. The bottle-sorting hopper lid 5 is pivotally connected to the top opening of the bottle-sorting hopper 6, covering the top to reduce dust or other foreign objects falling into the preforms. The bottle inlet 4 is located at the high end of the bottle-sorting hopper lid 5, used to control the entry path of the preforms and maintain a closed environment, further reducing the risk of contamination.

[0037] Two bottle-dropping baffles 3 are positioned opposite each other, forming a channel through which several PET preforms 8 can pass, guiding the preforms through in an orderly manner and preventing haphazard accumulation. A bottle-scrambling roller assembly 2 is located inside the bottle-scrambling hopper 6, with two parallel bottle-scrambling rollers 2-3 whose spacing is adjustable. The distance between them is greater than the outer diameter of the PET preform tube 8 but smaller than the outer diameter of the tube opening, ensuring that the tube body of the preform can pass through while the tube opening is blocked, thus achieving a single-row arrangement. A bottle-scrambling motor 2-1 is mounted on the bottle-scrambling hopper 6 and connected to the two bottle-scrambling rollers 2-3 via an adjustable transmission mechanism 2-2, driving them to rotate synchronously in opposite directions, ensuring that the spacing is adjustable to accommodate preforms of different sizes.

[0038] The bottle-pushing wheel assembly 7 is installed at the lower end of the inner cavity of the bottle-scraping hopper 6, above the bottle-scraping roller assembly 2, and is used to assist in the sorting and conveying of preforms. Specifically, the bottle-pushing wheel assembly 7, through the rotation of the bottle-pushing roller 7-2, further pushes the preforms arranged in an array by the bottle-scraping roller assembly 2 to the next process. Thus, the entire device reduces contamination through the cooperation between the bottle-scraping hopper cover 5 and the bottle inlet 4, guides and arranges the preforms through the synergistic action of the bottle drop baffle 3 and the bottle-scraping roller assembly 2, and achieves spacing adjustment through the combination of the adjustable transmission mechanism 2-2 and the bottle-scraping roller 2-3, ultimately forming a closed and adjustable sorting path. This effectively solves the problems of dust or foreign objects easily falling into the preforms during the preform sorting process and the fixed preform channel size being unable to adapt to preforms of different sizes.

Claims

1. A finishing device for PET preform production, characterized in that: The system includes a support frame (1), on which a bottle-sorting hopper (6) with one end higher than the other is mounted. A bottle-sorting hopper cover (5) is pivotally connected to the top opening of the bottle-sorting hopper (6). A bottle inlet (4) is opened at the high end of the bottle-sorting hopper cover (5). Two bottle-dropping baffles (3) corresponding to the bottle inlet (4) are provided in the inner cavity of the bottle-sorting hopper (6). The two bottle-dropping baffles (3) are arranged opposite each other and a channel is left between them for several PET bottle preforms (8) to pass through. A bottle-sorting roller assembly (2) is provided in the inner cavity of the bottle-sorting hopper (6) for arranging several PET bottle preforms (8) into an array. The system also includes a lever installed at the lower end of the inner cavity of the bottle-sorting hopper (6) above the bottle-sorting roller assembly (2). Bottle wheel assembly (7); Bottle unscrambling roller assembly (2) includes two bottle unscrambling rollers (2-3) rotatably connected to and parallel to the long strip-shaped discharge port at the lower end of the bottle unscrambling hopper box (6). The two bottle unscrambling rollers (2-3) are arranged opposite each other and the distance between them is adjustable. The distance between the two bottle unscrambling rollers (2-3) is greater than the outer diameter of the tube body of the PET bottle preform (8) and less than the outer diameter of the tube opening of the PET bottle preform (8). It also includes a bottle unscrambling motor (2-1) installed on the bottle unscrambling hopper box (6). An adjustable transmission mechanism (2-2) is installed between the output shaft of the bottle unscrambling motor (2-1) and the two bottle unscrambling rollers (2-3) to drive the two bottle unscrambling rollers (2-3) to rotate synchronously in opposite directions and to ensure that the distance between them is adjustable.

2. The finishing device for PET preform production as described in claim 1, characterized in that: The adjustable transmission mechanism (2-2) includes an adjusting groove (2-2-7) spanning the elongated discharge port at the lower end of the bottle-scraping hopper (6) and opening on both the high-end and low-end surfaces of the hopper. Adjustable bottle-scraping shaft seats one (2-2-8) and two (2-2-11) are installed in each adjusting groove (2-2-7). Two bottle-scraping rollers (2-3) are rotatably connected between the two bottle-scraping shaft seats one (2-2-8) and two bottle-scraping shaft seats two (2-2-11). A synchronous pulley one (2-2-9) is keyed to the outer end of one bottle-scraping roller (2-3), and a synchronous pulley two (2-2-10) is keyed to the outer end of the other bottle-scraping roller (2-3). The device includes a tension adjustment seat (2-2-5) installed on the high end of the bottle feeding hopper (6), a tension screw (2-2-6) screwed onto the tension adjustment seat (2-2-5); a handle is installed on the outer end of the tension screw (2-2-6), and a tension wheel seat (2-2-4) is movably connected to the inner end; a tension pulley (2-2-3) is rotatably connected to the tension wheel seat (2-2-4); a drive pulley (2-2-1) is keyed to the output shaft of the bottle feeding motor (2-1); and a transmission belt (2-2-2) is connected to each pulley. Synchronous pulley one (2-2-9) and synchronous pulley two (2-2-10) are located on the inner and outer sides of the transmission belt (2-2-2), respectively.

3. The finishing device for PET preform production as described in claim 2, characterized in that: A through groove extending along its length is provided in the adjusting slide groove (2-2-7) opened on the high end surface of the bottle feeding hopper box (6). The shaft of the bottle feeding roller (2-3) passes through the through groove and is rotatably connected to the corresponding bottle feeding shaft seat. A strip hole extending along its length is provided in each adjusting slide groove (2-2-7). Each bottle feeding shaft seat is locked to the bottle feeding hopper box (6) by bolts and lock nuts passing through the strip hole.

4. The finishing device for PET preform production as described in claim 1, characterized in that: The bottle-dispensing wheel assembly (7) includes a dispensing wheel motor (7-1) mounted on the bottle-dispensing hopper box (6), a dispensing shaft (7-3) rotatably connected to the bottle-dispensing hopper box (6) on the output shaft of the dispensing wheel motor (7-1), the dispensing shaft (7-3) spanning the elongated discharge port at the lower end of the bottle-dispensing hopper box (6), and a dispensing wheel (7-2) mounted on the dispensing shaft (7-3).

5. The finishing device for PET preform production as described in claim 1, characterized in that: The bottle-dispensing wheel (7-2) includes a sleeve with a through hole extending radially thereon. The bottle-dispensing shaft (7-3) and the bottle-dispensing wheel (7-2) are connected by bolts passing through the through hole. Several blades evenly distributed along the circumference are fixed on the outer peripheral wall of the sleeve.

6. The finishing device for PET preform production as described in claim 2, characterized in that: [The following text appears to be incomplete and requires further context: "finishing"] The bottle hopper box (6) includes an inclined and parallel high baffle (6-1) and a low baffle (6-4) fixed on the support (1), with the high baffle (6-1) positioned higher than the low baffle (6-4). A hopper rear side plate (6-2) and a hopper front side plate (6-5) are fixed between the high baffle (6-1) and the low baffle (6-4), respectively. The lower ends of the hopper rear side plate (6-2) and the hopper front side plate (6-5) are bent inward to form a guide part (6-3). The lower edges of the two guide parts (6-3) are fitted together to form a long strip-shaped discharge port at the lower end of the bottle hopper box (6). A bottle outlet corresponding to the long strip-shaped discharge port is opened at the lower part of the low baffle (6-4). The two bottle-scraping rollers (2-3) in the bottle-scraping roller assembly (2) are located below the two guide parts (6-3) and fitted together with them.

7. The finishing device for PET preform production as described in claim 1, characterized in that: The bottle drop baffle (3) is shaped like a winnowing basket and its bottom surface is inclined, with the inclination direction gradually moving inward from top to bottom.

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