A bottle blowing machine with high positioning accuracy
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KUKO FUJIAN MASCH IND CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-07-14
Smart Images
Figure CN224490003U_ABST
Abstract
Description
[Technical Field]
[0001] This utility model relates to the field of blow molding machine technology, and specifically to a blow molding machine with high positioning accuracy. [Background Technology]
[0002] A blow molding machine is an industrial device that processes plastic granules or preforms into hollow containers using a blow molding process. It is widely used in the packaging of beverages, pharmaceuticals, cosmetics, and food. Its core principle is to use air pressure to force heated and softened plastic material to adhere to the inner wall of a mold, forming the finished product after cooling and demolding. In the field of automated blow molding production, the production of bottles with threaded nozzle positioning functions (such as threaded bottle necks) has long faced two major technical bottlenecks:
[0003] 1. Insufficient initial positioning accuracy; although current fully automatic blow molding machines can achieve tooth positioning, they generally use rigid fixed positioning mechanisms, as shown in the attached... Figure 1 As shown, the tooth positioning seat 501 is directly fixed on the existing rotating shaft 502, and mechanical dry friction occurs between the tooth positioning seat 501 and the existing preform pad 503, resulting in preform positioning deviation.
[0004] 2. Secondary offset during the transfer process: After the preform is initially positioned, it needs to be transferred to the molding die by grippers. This process causes cumulative positional deviation, which in turn causes the preform to shift, resulting in accuracy deviation. It can only be intervened by manual sampling inspection, which disrupts the continuity of the fully automated production line, reduces production efficiency, and results in a high scrap rate.
[0005] In view of this, this case involves in-depth research into the aforementioned issues, which led to the formation of this case. [Utility Model Content]
[0006] This invention aims to solve the technical problems of poor nozzle positioning accuracy and high scrap rate in existing blow molding machines. It provides a blow molding machine with high positioning accuracy by changing the installation and fixing method of the nozzle positioning component and the preform insert head. A ball bearing installation method replaces the original direct fixing method. The ball bearing connects the positioning seat and the rotating shaft, completely eliminating frictional resistance and avoiding dryness problems. A correction mechanism is added to the molding device to correct positioning deviations caused by displacement and placement through grippers, ensuring the positioning accuracy of each preform.
[0007] This utility model is implemented as follows: A blow molding machine with high positioning accuracy includes a conveying device and a molding device; the conveying device includes an annular conveying mechanism, multiple rotating mechanisms mounted on the annular conveying mechanism, a rotating drive mechanism for driving the rotating mechanisms to rotate, a preform removal mechanism for separating the preform from the rotating mechanisms, and a transfer mechanism for placing the preform into the molding device; the rotating drive mechanism is located at the annular end of the annular conveying mechanism, the preform removal mechanism is fixedly mounted on the annular conveying mechanism, and the transfer mechanism is located below the preform removal mechanism; the rotating mechanism includes a gear, a rotating shaft, a preform insertion head, and a tooth positioning assembly; the gear is mounted on the upper outer wall of the rotating shaft; the preform insertion head is fixedly mounted on the bottom end of the rotating shaft; the tooth positioning assembly includes a positioning seat, a ball bearing, and a rotating positioning element; one end of the positioning seat forms a through hole for the rotating shaft to pass through, the positioning seat is rotatably mounted on the outer wall of the rotating shaft through the ball bearing, and the rotating positioning element is mounted on the other end of the positioning seat through a torsion spring, the rotating positioning element including a positioning plate.
[0008] Furthermore, a vertical groove is formed on the outside of the preform's teeth for the positioning piece to be inserted.
[0009] Furthermore, the through hole is connected to a first groove for installing a ball bearing, and the first groove is connected to a second groove for installing a C-shaped buckle. The inner diameter of the first groove is larger than the inner diameter of the through hole and smaller than the inner diameter of the second groove. The lower outer wall of the rotating shaft is recessed with a third groove for installing a ball bearing, and the third groove is correspondingly set with the first groove.
[0010] Furthermore, the dental positioning assembly also includes a guide bracket; the positioning seat forms a perforation for the guide bracket to pass through, the upper end of the guide bracket is connected to the headstock seat, and the bottom end of the guide bracket passes through the perforation.
[0011] Furthermore, the self-rotating mechanism also includes a blank holder, an annular magnet, a washer, a spacer ring, a first bearing component, a first pad, a spring, a second pad, and a second bearing component; the blank holder has a through-hole forming an installation cavity, and the rotating shaft is installed in the installation cavity; the annular magnet, washer, spacer ring, first bearing component, first pad, spring, second pad, and second bearing component are fitted onto the outer wall of the rotating shaft from top to bottom; the washer is fixedly connected to the rotating shaft by a pin, and the annular magnet is assembled inside the washer.
[0012] Furthermore, the insert head includes an insert head, a pressing ring, and a head pad; the pressing ring is sleeved on the outer wall of the insert head, and the head pad is installed on the top of the insert head and the pressing ring; the insert head and the head pad form bolt holes along the central axis; the insert head is connected to the bottom end of the rotating shaft through a bolt assembly.
[0013] Furthermore, the self-rotation drive mechanism includes an arc-shaped gear ring. When the self-rotation mechanism enters the arc-shaped gear ring, the gear meshes with the arc-shaped gear ring, causing the self-rotation mechanism to rotate.
[0014] Furthermore, the decoction mechanism includes a left clamp and a right clamp for holding the washer, a drive assembly for simultaneously raising the left clamp, the right clamp, and the self-rotation mechanism, and a Z-shaped mounting platform; the drive assembly includes a cylinder, a floating joint, and a decoction plate; the cylinder is fixedly mounted on the top of the Z-shaped mounting platform, and the cylinder output end is connected to the decoction plate through the floating joint; the left clamp includes a first left jaw and a second left jaw, the first left jaw is mounted on the first end of the decoction plate through a first left rotating shaft, and the second left jaw is mounted on the second end of the decoction plate through a second left rotating shaft; the right clamp includes a first right jaw and a second right jaw. Two right grippers are included. The first right gripper is mounted on the first end of the blank-drawing plate via a first right rotating shaft, and the second right gripper is mounted on the second end of the blank-drawing plate via a second right rotating shaft. The first left gripper and the first right gripper are connected by a first tension spring, and the second left gripper and the second right gripper are connected by a second tension spring. The plate also includes a first pull plate and a second pull plate. The first pull plate is fixedly mounted on the lower part of the first left gripper and the second left gripper, and the second pull plate is fixedly mounted on the lower part of the first right gripper and the second right gripper. The first pull plate has a first step for a washer to abut against, and the second pull plate has a second step for a washer to abut against.
[0015] Furthermore, the molding device includes a first molding die mechanism and a second molding die mechanism arranged opposite to each other, and a correction mechanism for correcting deviations of the preform; the correction mechanism is installed on the top of the first molding die mechanism and is arranged towards the second molding die mechanism; the correction mechanism includes a first gripper, a second gripper, and a gripper cylinder for driving the opening and closing of the first gripper and the second gripper, the gripper cylinder being installed on the top of the first molding die mechanism.
[0016] Furthermore, the first forming mold mechanism includes a first template base, a first guide rail assembly, and a first mold. The first template base is mounted on the first guide rail assembly, the first mold is mounted on the first template base, and a straightening mechanism is mounted on the top of the first mold. The second forming mold mechanism includes a second template base, a second guide rail assembly, and a second mold. The second template base is mounted on the second guide rail assembly, and the second mold is mounted on the second template base.
[0017] This invention relates to a high-precision blow molding machine that changes the installation and fixing method of the tooth positioning component and the preform insertion head. Instead of the original direct fixing method, a ball bearing installation method is adopted. The ball bearing connects the positioning seat and the rotating shaft, completely eliminating frictional resistance and avoiding the problem of dryness. A correction mechanism is added to the molding device to correct the positioning deviation caused by displacement and placement through the gripper, ensuring the positioning accuracy of each preform. [Attached Image Description]
[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0019] Figure 1 This is a schematic diagram of the structure of a self-rotating mechanism in the prior art.
[0020] Figure 2 This is a schematic diagram of the preform structure in this utility model.
[0021] Figure 3 This is a schematic diagram of the blow molding machine in this utility model.
[0022] Figure 4 This is a schematic diagram of the rotation mechanism in this utility model.
[0023] Figure 5 This is a cross-sectional view of the rotation mechanism in this utility model.
[0024] Figure 6 This is a schematic diagram of the tooth positioning component in this utility model.
[0025] Figure 7 This is a cross-sectional view of the tooth positioning component in this utility model.
[0026] Figure 8 This is a schematic diagram of the embryo removal mechanism in this utility model.
[0027] Figure 9 This is a schematic diagram of the molding device in this utility model.
[0028] Figure 10 This is a schematic diagram of the structure of the first forming mold mechanism in this utility model.
[0029] Reference numerals: Conveying device 100, Annular conveying mechanism 1, Rotating mechanism 2, Gear 21, Rotating shaft 22, Inserting head 23, Inserting body 231, Pressing ring 232, Head pad 233, Toothed positioning assembly 24, Positioning seat 241, Through hole 2411, First groove 2412, Second groove 2413, Through hole 2414, Ball bearing 242, Rotary positioning component 243, Torsion spring 2431, Positioning piece 2432, Fourth C-shaped retaining ring 244, Guide bracket 245, Head seat 25, Mounting cavity 251, Washer 26, Annular magnet 27, Spacer ring 28, First bearing component 29, First pad 210, Spring 211, Second pad 212, Second bearing component 213, Pin 214, First C-shaped retaining ring 21 5. Second C-type buckle 216, Third C-type buckle 217, Connecting part 218, Rotation drive mechanism 3, Arc-shaped toothed ring 31, Preform removal mechanism 4, Left clamp 41, First left clamp 411, Second left clamp 412, First tension spring 413, Right clamp 42, Drive assembly 43, Cylinder 431, Floating joint 432, Preform removal plate 433, Slider 434, Z-shaped mounting platform 44, Slide rail 441, First pull plate 45, Second pull plate 46, Forming device 200, First forming mold mechanism 5, First template seat 51, First guide rail assembly 52, First mold 53, Second forming mold mechanism 6, Correction mechanism 7, First clamp 71, Second clamp 72, Clamp cylinder 73, Transfer mechanism 8, Preform 400, Vertical slot 401.
[0030] Tooth positioning seat 501, existing rotating shaft 502, existing blank head pad 503.
Detailed Implementation Methods
[0031] To better understand the technical solution of this utility model, the technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0032] Please see Figures 2 to 10 As shown, a blow molding machine with high positioning accuracy includes a conveying device 100 and a forming device 200. The preform conveying device 100 has conveying and aligning functions, and transfers the aligned preforms 400 into the forming cavity of the forming device 300.
[0033] As attached Figure 3As shown, the conveying device 100 includes an annular conveying mechanism 1, multiple rotating mechanisms 2 mounted on the annular conveying mechanism 1, a rotating drive mechanism 3 that drives the rotating mechanisms 2 to rotate, a preform removal mechanism 4 that separates the preform 400 from the rotating mechanism 2, and a transfer mechanism 8 that places the preform 400 into the molding device 200. The preform removal mechanism 4 is fixedly mounted on the annular conveying mechanism 1, and the transfer mechanism 8 is located below the preform removal mechanism 4. The annular conveying mechanism 1 includes a driving rotary disk 11, a driven rotary disk 12, an annular conveying chain 13, and a power motor that drives the driving rotary disk 11 to rotate. The end of the annular conveying chain 13 at the driving rotary disk 11 is defined as the first end, and the end at the driven rotary disk 12 is defined as the second end. The rotating drive mechanism 3 is located at the first end of the annular conveying mechanism 1, and the preform removal mechanism 4 is located above one side of the annular conveying chain 13 for clamping and lifting the rotating mechanism 2.
[0034] Preforms 400 are inserted one by one into the insertion head 23 at the bottom of the rotating mechanism 2 using a robotic arm or manually. After being transported to the arc-shaped gear ring 31, the gear 21 of the rotating mechanism 2 meshes with the arc-shaped gear ring 31 and rotates, thereby causing the preforms 400 to rotate together (the maximum rotation range of the preforms 400 is 360°). When the positioning piece 2432 encounters the slot 401, the preforms 400 stop rotating and are transported forward to the underside of the preform removal mechanism 4. Then, the transfer mechanism 8 clamps the preforms 400, and the preform removal mechanism 4 clamps the rotating mechanism 2 and lifts it up, separating the preforms 400 from the insertion head 23 of the rotating mechanism 2. The transfer mechanism 8 is conventional prior art and includes a transverse gripper and a transverse drive mechanism that drives the transverse gripper to move. The transverse gripper can clamp the preforms 400, separating them from the rotating mechanism 2, and then the transverse drive mechanism places the preforms 400 into the molding device 200.
[0035] As attached Figure 4-7As shown, the self-rotating mechanism 2 includes a gear 21, a rotating shaft 22, a preform insertion head 23, and a toothed positioning assembly 24; the gear 21 is mounted on the upper outer wall of the rotating shaft 22; the preform insertion head 23 is fixedly mounted on the bottom end of the rotating shaft 22; the toothed positioning assembly 24 includes a positioning seat 241, a ball bearing 242, and a rotating positioning component 243; one end of the positioning seat 241 forms a through hole 2411 for the rotating shaft 22 to pass through, and the positioning seat 241 is rotatably mounted on the outer wall of the rotating shaft 22 through the ball bearing 242; the rotating positioning component 243 is mounted on the other end of the positioning seat 241 through a torsion spring 2431, and the rotating positioning component 243 includes a positioning piece 2432 for engaging the preform 400 in the vertical slot 401. By using ball bearings 242, the rigid connection between the positioning seat 241 and the rotating shaft 22 is changed to a rotatable connection, completely eliminating the frictional resistance between the toothed positioning seat 241 and the preform pad 233, and avoiding positioning deviations caused by mechanical stiffness. The positioning plate 2432 is elastically engaged into the vertical groove 401 of the preform 400 via a torsion spring 2431, ensuring the sensitivity and repeatability of the toothed positioning action of the preform 400. The positioning plate 2432 driven by the torsion spring 2431 achieves flexible engagement, avoiding damage to the preform from hard collisions.
[0036] As attached Figure 3 As shown, the self-rotation drive mechanism 3 is located at the annular end of the annular conveying mechanism 1, and is used to drive the self-rotation mechanism 2 to achieve a maximum rotation of 360°. The self-rotation drive mechanism 3 includes an arc-shaped gear ring 31. When the self-rotation mechanism 2 enters the arc-shaped gear ring 31, the gear 21 meshes with the arc-shaped gear ring 31, causing the self-rotation mechanism 2 and the preform 400 to rotate together. The preform 400 has a vertical groove 401 formed on the outer surface of the teeth for the positioning piece 2432 to be inserted. Since it is impossible to guarantee that the vertical groove 401 and the positioning piece 2432 will immediately insert into the vertical groove 401 after the teeth of the preform 400 are inserted into the preform insertion head 23, the preform 400 needs to rotate a certain angle before the positioning piece 2432 can be inserted into the vertical groove 401. At this time, the rotating shaft 22 cannot rotate, and the gear 21 rotates freely, thus achieving the positioning of the teeth of the preform 400.
[0037] As attached Figure 4-7As shown, the through hole 2411 connects to a first groove 2412 for installing the ball bearing 242, and the first groove 2412 connects to a second groove 2413 for installing the fourth C-shaped retaining ring 244. The inner diameter of the first groove 2412 is larger than the inner diameter of the through hole 2411 and smaller than the inner diameter of the second groove 2413. The stepped groove design (through hole 2411 → first groove 2412 → second groove 2413) and the limiting structure of the fourth C-shaped retaining ring 244 ensure the axial stability of the ball bearing 242 installation and prevent radial runout of the rotating shaft 22 caused by loosening of the ball bearing 242. By setting the inner diameter of the second groove 2413 to be larger than that of the first groove 2412, it is convenient to install the ball bearing 242. The ball bearing 242 is placed first, and then the fourth C-shaped retaining ring 244 is installed. The lower outer wall of the rotating shaft 22 is recessed with a third groove for installing the ball bearing 242, and the third groove is correspondingly set with the first groove 2412. The third groove and the first groove 2412 form a mounting groove for installing the ball bearing 242, maintaining the long-term positioning accuracy of the ball bearing 242.
[0038] As attached Figure 6-7 As shown, the orifice positioning assembly 24 also includes a guide bracket 245; the positioning seat 241 forms a through hole 2414 for the guide bracket 245 to pass through, the upper end of the guide bracket 245 is connected to the preform seat 25, and the bottom end of the guide bracket 245 passes through the through hole 2414. The guide bracket 245 ensures that the orifice positioning assembly 24, the preform insert 23, and the preform 400 move up and down in the vertical direction.
[0039] As attached Figure 4-5As shown, the self-rotating mechanism 2 further includes a blank holder 25, a washer 26, an annular magnet 27, a spacer ring 28, a first bearing component 29, a first pad 210, a spring 211, a second pad 212, and a second bearing component 213. The blank holder 25 forms a mounting cavity 251, and the rotating shaft 22 is installed in the mounting cavity 251. The annular magnet 27, washer 26, spacer ring 28, first bearing component 29, first pad 210, spring 211, second pad 212, and second bearing component 213 are fitted onto the outer wall of the rotating shaft 22 from top to bottom. The washer 26 is fixedly connected to the rotating shaft 22 by a pin 214, and the annular magnet 27 is assembled inside the washer 26. Preferably, the first bearing component 29 and the second bearing component 213 are ball bearings. Washer 26 and gear 21 are attracted together by ring magnet 27. The friction between them enables gear 21 to rotate, driving the rotation shaft 22. When the preform 400 rotates within 360°, the positioning piece 2432 is secured into the vertical slot 401 of the preform 400. Once the positioning piece 2432 is secured into the vertical slot 401, the rotational torque of the rotation shaft 22 is much greater than the friction between gear 21 and washer 26. This allows gear 21 to continue rotating while the positioned rotation shaft 22 stops rotating, ensuring that the rotation angle of gear 21 is greater than 360° and ensuring precise positioning of each tooth. When the preform removal mechanism 4 pulls washer 26 upward, the rotation shaft 22 and insert head 23 rise, the second pad 212 compresses spring 211, and the transfer mechanism 8 clamps the preform 400, separating the preform 400 from the insert head 23.
[0040] The self-rotating mechanism 2 also includes a first C-shaped retaining ring 215 and a second C-shaped retaining ring 216; the blank head seat 25 is also recessed with a first C-shaped retaining groove for installing the first C-shaped retaining ring 215 and a second C-shaped retaining groove for installing the second C-shaped retaining ring 216, the inner diameter of the first C-shaped retaining groove and the second C-shaped retaining groove is larger than the inner diameter of the mounting cavity 251; the top surface of the first bearing member 29 abuts against the bottom surface of the first C-shaped retaining ring 215, and the bottom surface of the second bearing member 213 abuts against the top surface of the second C-shaped retaining ring 216; the C-shaped retaining ring limit ensures that the rotating shaft 22 can be raised and lowered stably.
[0041] The inner wall of the blank holder 25 is also recessed with a third groove for installing the first bearing component 29 and a fourth groove for installing the second bearing component 213. The inner diameter of the third groove and the fourth groove is larger than the inner diameter of the mounting cavity 251 and smaller than the inner diameter of the first C-groove and the second C-groove.
[0042] The rotation mechanism 2 also includes a third C-shaped retaining ring 217. The outer wall of the rotating shaft 22 has a third C-shaped retaining groove for mounting the third C-shaped retaining ring 217. The second pad 212 is mounted on the third C-shaped retaining ring 217. The cooperation between the third C-shaped retaining ring 217 and the third C-shaped retaining groove provides a rigid support point for the second pad 212.
[0043] The embryo head seat 25 is engaged with the annular conveying mechanism 1 via the connecting part 218.
[0044] As attached Figure 5 As shown, the insert head 23 includes an insert body 231, a pressing ring 232, and a head pad 233. The pressing ring 232 is sleeved on the outer wall of the insert body 231, and the head pad 233 is installed on the top of the insert body 231 and the pressing ring 232. Bolt holes are formed along the central axis of the insert body 231 and the head pad 233. The insert head 23 is connected to the bottom end of the rotating shaft 22 by a bolt assembly. The modular bolt connection of the insert body 231, the pressing ring 232, and the head pad 233 enables rapid replacement of worn parts, reducing downtime caused by equipment maintenance (improving production efficiency and indirectly reducing scrap costs).
[0045] As attached Figure 8-10As shown, the de-coating mechanism 4 includes a left clamp 41 and a right clamp 42 that clamp the washers 26, a drive assembly 43 that drives the left clamp 41, the right clamp 42, and the rotation mechanism 2 to rise simultaneously, and a Z-shaped mounting platform 44. The washers 26 of the multiple rotation mechanisms 2 enter between the left clamp 41 and the right clamp 42 and are clamped by them. The drive assembly 43 drives the left clamp 41, the right clamp 42, and the rotation mechanism 2 to rise simultaneously. The drive assembly 43 includes a cylinder 431, a floating joint 432, and a de-coating plate 433. The cylinder 431 is fixedly mounted on the top of the Z-shaped mounting platform 44, and its output end is connected to the de-coating plate 433 via the floating joint 432. When the rotation assembly reaches the workstation, the left clamp 41 and the right clamp 42 automatically clamp the washers 26 via tension springs; subsequently, the cylinder 431 retracts, driving the de-coating plate 433 to rise, simultaneously lifting the rotating shaft 22. The left clamp 41 includes a first left clamping jaw 411 and a second left clamping jaw 412. The first left clamping jaw 411 is mounted to the first end of the drawing plate 433 via a first left rotating shaft, and the second left clamping jaw 412 is mounted to the second end of the drawing plate 433 via a second left rotating shaft. The right clamp 42 includes a first right clamping jaw and a second right clamping jaw. The first right clamping jaw is mounted to the first end of the drawing plate 433 via a first right rotating shaft, and the second right clamping jaw is mounted to the second end of the drawing plate 433 via a second right rotating shaft. By adjusting the tightness of the first left rotating shaft, the second left rotating shaft, the first right rotating shaft, and the second right rotating shaft, the distance between the left clamp 41 and the right clamp 42 can be adjusted to accommodate washers 26 of different sizes. The first left clamping jaw 411 and the first right clamping jaw are connected by a first tension spring 413, and the second left clamping jaw 412 and the second right clamping jaw are connected by a second tension spring. The distance between the left clamp 41 and the right clamp 42 is adaptive to the size of the washer 26 by the tension spring. It also includes a first pull plate 45 and a second pull plate 46. The first pull plate 45 is fixedly installed on the lower part of the first left gripper 411 and the second left gripper 412, and the second pull plate 46 is fixedly installed on the lower part of the first right gripper and the second right gripper. The first pull plate 45 forms a first step for the washer 26 to abut against, and the second pull plate 46 forms a second step for the washer 26 to abut against. A slider 434 is fixedly connected to one side of the blank-drawing plate 433, and a slide rail 441 that cooperates with the slider 434 is provided on the Z-shaped mounting platform 44. The combination of the slider 434 and the slide rail 441 ensures that the blank-drawing plate 433 moves vertically.
[0046] The molding apparatus 200 includes a first molding mold mechanism 5 and a second molding mold mechanism 6 arranged opposite to each other, and a correction mechanism 7 for correcting deviations in the preform 400. The correction mechanism 7 is installed on top of the first molding mold mechanism 5 and faces the second molding mold mechanism 6. Because the preform 400 is picked up and placed into the mold cavity by the lateral gripper of the transfer mechanism 8, the originally precisely positioned preform 400 may shift during the movement and placement of the preform 400, causing accuracy deviations. The correction mechanism 7 above the mold can correct the positioning deviation of the preform 400, ensuring accurate positioning before blow molding, thus guaranteeing accurate bottle positioning and finished product quality. The correction mechanism 7 added to the top of the molding mold performs a secondary position calibration of the preform 400 before blow molding, eliminating accumulated errors during the transfer process. The correction mechanism 7 faces the second mold, ensuring that the preform 400 is centered in both mold cavities at the moment of mold closing, avoiding uneven wall thickness during blow molding.
[0047] The correction mechanism 7 includes a first gripper 71, a second gripper 72, and a gripper cylinder 73 that drives the opening and closing of the first gripper 71 and the second gripper 72. The gripper cylinder 73 is mounted on the top of the first molding mold mechanism 5. The gripper cylinder 73 drives the opening and closing action of the two grippers to achieve active mechanical correction of the preform deviation of 400°, which is more reliable than manual intervention or passive positioning. The top mounting position of the gripper cylinder 73 avoids interference with the mold opening and closing action, ensuring that the production cycle is not affected by the correction, thus balancing accuracy and efficiency.
[0048] The first forming mold mechanism 5 includes a first template base 51, a first guide rail assembly 52, and a first mold 53. The first template base 51 is mounted on the first guide rail assembly 52, and the first mold 53 is mounted on the first template base 51. A straightening mechanism 7 is mounted on top of the first mold 53. The second forming mold mechanism 6 includes a second template base, a second guide rail assembly, and a second mold. The second template base is mounted on the second guide rail assembly, and the second mold is mounted on the second template base. The mold, through the combination of the template base and the guide rail assembly, achieves high-precision guidance during the mold closing process, preventing mold misalignment and extrusion of the preform 400. The straightening mechanism 7 is directly mounted on top of the mold, forming an integrated "correction-forming" station, reducing the risk of secondary offset. The first guide rail assembly 52 includes a linear guide and a slider fixed to the bottom of the first template base 51.
[0049] The blow molding machine of this utility model has at least the following beneficial technical effects:
[0050] 1. Significantly improved positioning accuracy: The ball bearing 242 connects the positioning seat 241 and the rotating shaft 22, completely eliminating frictional resistance and avoiding the dryness problem caused by direct fixing, achieving a positioning repeatability accuracy of ±0.1mm. The positioning plate 2432 driven by the torsion spring 2431 achieves flexible engagement, avoiding damage to the preform from hard collisions.
[0051] 2. Significantly reduced scrap rate: The design of the ring magnet 27 in the initial positioning stage allows the gear 21 to idle, and the overload protection of the preform 400 teeth solves the problem of excessive positioning torque damaging the preform; the secondary correction before molding, the correction mechanism 7 corrects the transfer deviation in real time, and the preform mold alignment is greatly improved.
[0052] The working principle of the blow molding machine of this utility model is as follows:
[0053] S1: Initial positioning stage of bottle preform 400; bottle preform 400 is placed on preform insert head 23, and self-rotation drive mechanism 3 drives gear 21 to rotate through arc-shaped gear ring 31; rotating shaft 22 rotates bottle preform 400 synchronously. When the vertical groove 401 of bottle preform rotates to the position of the tooth positioning piece 2432, the positioning piece is springed into the vertical groove 401 under the action of torsion spring 2431; at this time, rotating shaft 22 is blocked and stops rotating (gear 21 idles), and the initial positioning of tooth is completed;
[0054] S2: Preform 400 transfer and deprecation stage; the left clamp 41 and right clamp 42 of the deprecation mechanism 4 clamp the washer 26, and the cylinder 431 drives the deprecation plate 433 to rise through the floating joint 432; the rotating shaft 22 and the preform insertion head 23 move upward synchronously, the spring 211 is compressed, and the transfer mechanism 8 clamps the preform 400 to complete the non-destructive separation.
[0055] S3: Secondary correction stage before molding; After the preform 400 is transferred to the molding device 200, deviation may occur due to displacement; The gripper cylinder 73 drives the first gripper 71 and the second gripper 72 to clamp the preform 400 and correct its position to ensure that the axis of the preform 400 coincides with the center of the mold.
[0056] S4: Blow molding after mold closing.
[0057] The principle of this blow molding machine overcomes the long-standing problems of poor accuracy and high scrap rate in the blow molding machine tooth positioning industry through the dual guarantee mechanism of "initial positioning ball bearing friction reduction" and "dynamic secondary correction by correction mechanism". At the same time, it achieves zero human intervention in a fully automated production line and meets the stringent quality requirements of high-end bottle types (such as pharmaceutical bottles and cosmetic bottles).
[0058] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.
Claims
1. A blow molding machine with high positioning accuracy, characterized in that: The device includes a conveying device and a forming device; the conveying device includes an annular conveying mechanism, multiple rotating mechanisms mounted on the annular conveying mechanism, a rotating drive mechanism for driving the rotating mechanisms to rotate, a preform removal mechanism for separating the preform from the rotating mechanisms, and a transfer mechanism for placing the preform into the forming device; the rotating drive mechanism is located at the annular end of the annular conveying mechanism, the preform removal mechanism is fixedly mounted on the annular conveying mechanism, and the transfer mechanism is located below the preform removal mechanism; The self-rotating mechanism includes a gear, a rotating shaft, a blank insertion head, and a toothed positioning assembly; the gear is mounted on the upper outer wall of the rotating shaft; the blank insertion head is fixedly mounted on the bottom end of the rotating shaft; the toothed positioning assembly includes a positioning seat, a ball bearing, and a rotating positioning component; one end of the positioning seat forms a through hole for the rotating shaft to pass through, the positioning seat is rotatably mounted on the outer wall of the rotating shaft via the ball bearing, and the rotating positioning component is mounted on the other end of the positioning seat via a torsion spring, the rotating positioning component including a positioning plate.
2. The high-precision blow molding machine as described in claim 1, characterized in that: The preform has a vertical groove formed outside the teeth for the positioning piece to be inserted.
3. The high-precision blow molding machine as described in claim 2, characterized in that: The through hole is connected to a first groove for installing a ball bearing, and the first groove is connected to a second groove for installing a C-shaped buckle. The inner diameter of the first groove is larger than the inner diameter of the through hole and smaller than the inner diameter of the second groove. The lower outer wall of the rotating shaft is recessed with a third groove for installing a ball bearing, and the third groove is correspondingly set with the first groove.
4. The high-precision blow molding machine as described in claim 3, characterized in that: The dental positioning assembly also includes a guide bracket; the positioning seat forms a perforation for the guide bracket to pass through, the upper end of the guide bracket is connected to the head seat, and the bottom end of the guide bracket passes through the perforation.
5. The high-precision blow molding machine as described in claim 4, characterized in that: The self-rotating mechanism further includes a blank holder, an annular magnet, a washer, a spacer ring, a first bearing component, a first pad, a spring, a second pad, and a second bearing component; the blank holder has a through-hole forming an installation cavity, and the rotating shaft is installed in the installation cavity; the annular magnet, washer, spacer ring, first bearing component, first pad, spring, second pad, and second bearing component are fitted onto the outer wall of the rotating shaft from top to bottom; the washer is fixedly connected to the rotating shaft by a pin, and the annular magnet is assembled inside the washer.
6. The high-precision blow molding machine as described in claim 5, characterized in that: The insert head includes an insert body, a pressing ring, and a head pad; the pressing ring is sleeved on the outer wall of the insert body, and the head pad is installed on the top of the insert body and the pressing ring; the insert body and the head pad form bolt holes along the central axis; the insert body is connected to the bottom end of the rotating shaft through a bolt assembly.
7. The high-precision blow molding machine as described in claim 6, characterized in that: The self-rotation drive mechanism includes an arc-shaped gear ring. When the self-rotation mechanism enters the arc-shaped gear ring, the gear meshes with the arc-shaped gear ring, causing the self-rotation mechanism to rotate.
8. The high-precision blow molding machine as described in claim 7, characterized in that: The de-embrane mechanism includes a left clamp and a right clamp that clamp the washer, a drive assembly that drives the left clamp, the right clamp, and the self-rotation mechanism to rise simultaneously, and a Z-shaped mounting platform. The drive assembly includes a cylinder, a floating joint, and a blank-drawing plate; the cylinder is fixedly installed on the top of the Z-shaped mounting platform, and the cylinder output end is connected to the blank-drawing plate through the floating joint; The left clamping member includes a first left clamping jaw and a second left clamping jaw. The first left clamping jaw is mounted on the first end of the blank-drawing plate via a first left rotating shaft, and the second left clamping jaw is mounted on the second end of the blank-drawing plate via a second left rotating shaft. The right clamping member includes a first right clamping jaw and a second right clamping jaw. The first right clamping jaw is mounted on the first end of the blank-drawing plate via a first right rotating shaft, and the second right clamping jaw is mounted on the second end of the blank-drawing plate via a second right rotating shaft. The first left clamping jaw and the first right clamping jaw are connected by a first tension spring, and the second left clamping jaw and the second right clamping jaw are connected by a second tension spring. It also includes a first pull plate and a second pull plate. The first pull plate is fixedly installed on the lower part of the first left jaw and the second left jaw, and the second pull plate is fixedly installed on the lower part of the first right jaw and the second right jaw. The first pull plate has a first step for the washer to abut against, and the second pull plate has a second step for the washer to abut against.
9. The high-precision blow molding machine as described in any one of claims 1-8, characterized in that: The molding device includes a first molding die mechanism and a second molding die mechanism arranged opposite to each other, and a correction mechanism for correcting deviations of the preform; the correction mechanism is installed on the top of the first molding die mechanism and is arranged towards the second molding die mechanism; the correction mechanism includes a first gripper, a second gripper, and a gripper cylinder for driving the opening and closing of the first gripper and the second gripper, the gripper cylinder being installed on the top of the first molding die mechanism.
10. The high-precision blow molding machine as described in claim 9, characterized in that: The first forming mold mechanism includes a first template base, a first guide rail assembly, and a first mold. The first template base is mounted on the first guide rail assembly, the first mold is mounted on the first template base, and a straightening mechanism is mounted on the top of the first mold. The second forming mold mechanism includes a second template base, a second guide rail assembly, and a second mold. The second template base is mounted on the second guide rail assembly, and the second mold is mounted on the second template base.