A self-rotating device for a blow molding machine

Abstract

This utility model provides a self-rotating device for a blow molding machine, including a rotating housing, a rotating shaft, a preform inserter, and a nozzle positioning assembly. The rotating housing has a through-hole, and the rotating shaft is installed within the through-hole. The preform inserter is fixedly installed at the bottom end of the rotating shaft. The nozzle positioning assembly includes a positioning seat, a ball bearing, and a rotating positioning element. One end of the positioning seat has 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. The rotating positioning element is mounted on the other end of the positioning seat via a torsion spring and includes a positioning piece for engaging the preform in a preform slot. The self-rotating device uses a ball bearing mounting method instead of the original direct fixing method. The ball bearing connects the positioning seat and the rotating shaft, completely eliminating frictional resistance and avoiding dryness problems.

Description

[Technical Field]

[0001] This utility model relates to the field of blow molding machine technology, and specifically to a self-rotating device for a blow molding machine. [Background Technology]

[0002] A blow molding machine is an industrial equipment that processes plastic granules or preforms into hollow containers through 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 make heated and softened plastic material adhere to the inner wall of a mold to form a finished product after cooling.

[0003] In the field of automated blow molding production, preforms with toothed positioning function (as shown in the attached image) are used. Figure 2 The production of threaded bottle necks has long faced the problem of insufficient positioning accuracy. The external threads of the bottle preform's neck typically have vertical grooves for the positioning plate of the positioning mechanism to engage and position. However, while the rotation devices of current blow molding machines can achieve neck positioning, they generally employ rigid, fixed positioning mechanisms, such as those shown in the attached image. 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, which in turn leads to a high scrap rate and makes it impossible to ensure the quality of the bottle shape.

[0004] 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]

[0005] This invention aims to solve the technical problems of poor tooth positioning accuracy and high scrap rate in existing blow molding machines by providing a self-rotating device for blow molding machines. The self-rotating device uses a ball bearing installation method to replace the original direct fixing method. The ball bearing connects the positioning seat and the rotating shaft, completely eliminating frictional resistance and avoiding the problem of dryness.

[0006] This utility model is implemented as follows: A self-rotating device for a blow molding machine includes a self-rotating shell, a rotating shaft, a preform inserter, and a tooth positioning assembly; the self-rotating shell has a through-hole, and the rotating shaft is installed in the through-hole; the preform inserter is fixedly installed at the bottom end of the rotating shaft; the tooth positioning assembly includes a positioning seat, a ball bearing, and a rotating positioning component, one end of the positioning seat has a through hole for the rotating shaft to pass through, the positioning seat is rotatably installed on the outer wall of the rotating shaft by the ball bearing, and the rotating positioning component is installed on the other end of the positioning seat by a torsion spring, the rotating positioning component includes a positioning piece for engaging the preform slot.

[0007] Furthermore, the through hole is connected to a first mounting groove for installing ball bearings, and the first mounting groove is connected to a second mounting groove for installing a fourth C-shaped retaining ring. The inner diameter of the first mounting groove is larger than the inner diameter of the through hole and smaller than the inner diameter of the second mounting groove. The lower outer wall of the rotating shaft is recessed with a third mounting groove for installing ball bearings, and the third mounting groove is correspondingly set with the first mounting groove.

[0008] Furthermore, the tooth positioning assembly also includes a guide bracket; the positioning seat forms a through hole for the guide bracket to pass through, the upper end of the guide bracket is connected to the rotating housing, and the bottom end of the guide bracket passes through the through hole.

[0009] Furthermore, it also includes a gear, a ring magnet, a washer, a spacer ring, a first bearing component, a first pad, a spring, a second pad, and a second bearing component; the gear is mounted on the upper outer wall of the rotating shaft; the ring 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 ring magnet is assembled inside the washer.

[0010] Furthermore, it also includes a first C-shaped retaining ring and a second C-shaped retaining ring; the rotating housing is also recessed with a first mounting groove for installing the first C-shaped retaining ring and a second mounting groove for installing the second C-shaped retaining ring, the inner diameters of the first mounting groove and the second mounting groove being larger than the inner diameter of the mounting cavity; the top surface of the first bearing component abuts against the bottom surface of the first C-shaped retaining ring, and the bottom surface of the second bearing component abuts against the top surface of the second C-shaped retaining ring; the inner wall of the rotating housing is also recessed with a third mounting groove for installing the first bearing component and a fourth mounting groove for installing the second bearing component, the inner diameters of the third mounting groove and the fourth mounting groove being larger than the inner diameter of the mounting cavity and smaller than the inner diameters of the first mounting groove and the second mounting groove.

[0011] Furthermore, it also includes a third C-shaped retaining ring, with a third C-shaped retaining groove formed on the outer wall of the rotating shaft for installing the third C-shaped retaining ring, and the second pad is mounted on the third C-shaped retaining ring.

[0012] Furthermore, 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.

[0013] Furthermore, the rotating housing includes a connecting portion for engaging with the annular conveyor.

[0014] The advantages of this invention are: the self-rotation device uses a ball bearing installation method instead of the original direct fixing method. The ball bearing connects the positioning seat and the rotating shaft, completely eliminating frictional resistance and avoiding the problem of dryness. [Attached Image Description]

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of a self-rotating device in the prior art.

[0017] Figure 2 This is a schematic diagram of the preform structure in this utility model.

[0018] Figure 3 This is a schematic diagram of the blow molding machine in this utility model.

[0019] Figure 4 This is a schematic diagram of the rotation device in this utility model.

[0020] Figure 5 This is a cross-sectional view of the rotation device in this utility model.

[0021] Figure 6 This is a schematic diagram of the tooth positioning component in this utility model.

[0022] Figure 7 This is a cross-sectional view of the tooth positioning component in this utility model.

[0023] Figure 8 This is a schematic diagram of the embryo removal device in this utility model.

[0024] Figure 9 This is a schematic diagram of the molding die system in this utility model.

[0025] Figure 10 This is a schematic diagram of the structure of the first molding die device in this utility model.

[0026] Reference numerals: Conveying system 100, Circular conveying device 1, Active rotating disk 11, Driven rotating disk 12, Circular conveying chain 13, Rotating device 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 mounting groove 2412, Second mounting groove 2413, Through hole 2414, Ball bearing 242, Rotating positioning component 243, Torsion spring 2431, Positioning piece 2432, Fourth C-type buckle 244, Guide bracket 245, Rotating housing 25, Mounting cavity 251, Washer 26, Circular magnet 27, Spacer ring 28, First bearing component 29, First pad 210, Spring 211, Second pad 212, Second bearing component 213, Pin Shaft 214, First C-type buckle 215, Second C-type buckle 216, Third C-type buckle 217, Connecting part 218, Self-rotation drive device 3, Arc-shaped gear ring 31, Preform removal device 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, Molding mold system 200, First molding mold device 5, First template seat 51, First guide rail assembly 52, First mold 53, Second molding mold device 6, Correction device 7, First clamp 71, Second clamp 72, Clamp cylinder 73, Transfer device 8, Preform 400, Vertical slot 401.

[0027] Tooth positioning seat 501, existing rotating shaft 502, existing blank head pad 503.

Detailed Implementation Methods

[0028] 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.

[0029] Please see Figures 2 to 10 As shown, a blow molding machine includes a conveying system 100 and a molding die system 200. The conveying system 100 has conveying and aligning functions, and transfers the aligned preforms 400 into the molding cavity of the molding die system 200.

[0030] As attached Figure 3As shown, the conveying system 100 includes a ring conveyor 1, multiple rotating devices 2 mounted on the ring conveyor 1, a rotation drive device 3 that works with the ring conveyor 1 to drive the rotating devices 2 to rotate, a preform removal device 4 that separates the preform 400 from the rotating devices 3, and a transfer device 8 that places the preform 400 into the molding die system 200. The preform removal device 4 is fixedly mounted on the ring conveyor 1, and the transfer device 8 is located below the preform removal device 4. The ring conveyor 1 includes a driving rotary disk 11, a driven rotary disk 12, a ring conveyor chain 13, and a power motor that drives the driving rotary disk 11 to rotate. The end of the ring conveyor 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 rotation drive device 3 is located at the first end of the ring conveyor 1, and the preform removal device 4 is located above one side of the ring conveyor chain 13 for clamping and lifting the rotating devices 2.

[0031] During preform transport, preforms 400 are first inserted one by one into the insertion head 23 at the bottom of the rotating device 2 using a robotic arm or manually. After the rotating device 2 transports the preforms to the arc-shaped gear ring 31, the gear 21 meshes with the arc-shaped gear ring 31 and rotates, thereby driving 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 the rotating device 2 is transported forward to below the preform removal device 4. Then, the transfer device 8 clamps the preforms 400, and the preform removal device 4 clamps the rotating device 2 and rises, separating the preforms 400 from the insertion head 23 of the rotating device 3. The transfer device 8 is conventional prior art, and includes a transverse gripper and a transverse drive device that drives the transverse gripper to move. The transverse gripper can clamp the preforms 400, separating the preforms 400 from the rotating device 2, and then the transverse drive device places the preforms 400 into the molding mold system 200.

[0032] As attached Figure 4-7As shown, the self-rotating device 2 includes a gear 21, a rotating shaft 22, a blank insert head 23, a toothed positioning assembly 24, a rotating housing 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 rotating housing 25 has a through-hole forming a mounting cavity 251, and the rotating shaft 22 is installed in the mounting cavity 251. The gear 21 is installed on the upper outer wall of the rotating shaft 22. The blank insert head 23 is fixedly installed at the bottom end of the rotating shaft 22. 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 from top to bottom onto the outer wall of the rotating shaft 22. 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. The washer 26 and the gear 21 are attracted together by the ring magnet 27. The friction between the two enables the gear 21 to rotate, driving the rotation shaft 22 to rotate. When the preform 400 rotates within 360°, it ensures that the positioning piece 2432 is engaged in the vertical groove 401 of the preform 400. At the same time, after confirming that the positioning piece 2432 is engaged in the vertical groove 401 of the preform 400, the rotational torque of the rotation shaft 22 is much greater than the friction between the gear 21 and the washer 26. In this way, the gear 21 can continue to rotate while the rotation shaft 22, after being positioned, no longer rotates. This ensures that the rotation angle of the gear 21 is greater than 360° and ensures accurate positioning of each tooth. When the preform removal device 4 pulls the washer 26 upward, the rotating shaft 22 and the preform insertion head 23 rise, the second pad 212 compresses the spring 211, and the transfer device 8 clamps the preform 400, so that the preform 400 separates from the preform insertion head 23.

[0033] As attached Figure 6-7As shown, the tooth 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. The positioning seat 241 is rotatably mounted on the outer wall of the rotating shaft 22 via the ball bearing 242. The rotating positioning component 243 is mounted on the other end of the positioning seat 241 via a torsion spring 2431. The rotating positioning component 243 includes a positioning piece 2432 for engaging the preform 400 in the vertical groove 401. By changing the rigid connection between the positioning seat 241 and the rotating shaft 22 to a rotatable connection via the ball bearing 242, the frictional resistance between the tooth positioning seat 241 and the preform pad 233 is completely eliminated, avoiding positioning deviations caused by mechanical stiffness. The positioning piece 2432 elastically engages the preform 400 in the vertical groove 401 via the torsion spring 2431, ensuring the sensitivity and repeatability of the tooth positioning action of the preform 400. The positioning piece 2432 driven by the torsion spring 2431 achieves flexible engagement, avoiding damage to the preform from hard impacts. The through hole 2411 connects to a first mounting groove 2412 for mounting the ball bearing 242, and the first mounting groove 2412 connects to a second mounting groove 2413 for mounting the fourth C-shaped retaining ring 244. The inner diameter of the first mounting groove 2412 is larger than the inner diameter of the through hole 2411 and smaller than the inner diameter of the second mounting groove 2413. The stepped design of the mounting grooves (through hole 2411 → first mounting groove 2412 → second mounting 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 mounting groove 2413 to be larger than that of the first mounting 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 mounting groove for mounting the ball bearing 242, which corresponds to the first mounting groove 2412. The third mounting groove and the first mounting groove 2412 form a mounting groove for mounting the ball bearing 242, maintaining the long-term positioning accuracy of the ball bearing 242.

[0034] As attached Figure 4-5 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 rotating housing 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 insertion head 23, and the preform 400 move up and down in the vertical direction.

[0035] As attached Figure 4-5As shown, the rotating device 2 further includes a first C-shaped retaining ring 215 and a second C-shaped retaining ring 216; the rotating housing 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 diameters of the first C-shaped retaining groove and the second C-shaped retaining groove are 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 rings limit the movement to ensure the stable lifting and lowering of the rotating shaft 22. The inner wall of the rotating housing 25 is also recessed with a third mounting groove for installing the first bearing member 29 and a fourth mounting groove for installing the second bearing member 213, the inner diameters of the third mounting groove and the fourth mounting groove are larger than the inner diameter of the mounting cavity 251 and smaller than the inner diameters of the first C-shaped retaining groove and the second C-shaped retaining groove. The rotating device 2 further includes a third C-shaped retaining ring 217. A third C-shaped retaining groove is formed on the outer wall of the rotating shaft 22 for mounting the third C-shaped retaining ring 217. The second pad 212 is mounted abutting against 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. The rotating housing 25 is snapped onto the annular conveyor device 1 via a connecting part 218.

[0036] As attached Figure 4-5 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).

[0037] As attached Figure 3 As shown, the self-rotation drive device 3 is located at the annular end of the annular conveying device 1, and is used to drive the self-rotation device 2 to achieve a maximum rotation of 360°. The self-rotation drive device 3 includes an arc-shaped gear ring 31. When the self-rotation device 2 enters the arc-shaped gear ring 31, the gear 21 meshes with the arc-shaped gear ring 31, causing the self-rotation device 2 and the preform 400 to rotate together. The preform 400 has a vertical groove 401 formed on the tooth of the preform 400 for the positioning piece 2432 to be inserted. Each time the preform 400 tooth is inserted into the preform insertion head 23, it cannot be guaranteed that the vertical groove 401 corresponds with the positioning piece 2432 so that the positioning piece 2432 is inserted into the vertical groove 401. Therefore, the preform 400 needs to rotate a certain angle so that the positioning piece 2432 is 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 preform 400 tooth.

[0038] As attached Figure 8 As shown, the de-coating device 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 rotating devices 2 to rise simultaneously, and a Z-shaped mounting platform 44. The washers 26 of the multiple rotating devices 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 rotating devices 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 rotating 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.

[0039] As attached Figure 9-10As shown, the molding die system 200 includes a first molding die device 5 and a second molding die device 6 arranged opposite to each other, and a correction device 7 for correcting deviations in the preform 400. The correction device 7 is installed on top of the first molding die device 5 and faces the second molding die device 6. Because the preform 400 is gripped and placed in the mold cavity by the transverse gripper of the transfer device 8, the originally precisely positioned preform 400 may shift during the movement and placement of the preform 400, causing accuracy deviations. The correction device 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 product quality. The correction device 7 added to the top of the molding die performs a secondary position calibration of the preform 400 before blow molding, eliminating accumulated errors during the transfer process. The correction device 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.

[0040] The correction device 7 includes a first gripper 71, a second gripper 72, and a gripper cylinder 73 for driving 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 die device 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 opening and closing action of the die, ensuring that the production cycle is not affected by the correction, thus balancing accuracy and efficiency.

[0041] The first molding die device 5 includes a first template base 51, a first guide rail assembly 52, and a first die 53. The first template base 51 is mounted on the first guide rail assembly 52, and the first die 53 is mounted on the first template base 51. A straightening device 7 is mounted on top of the first die 53. The second molding die device 6 includes a second template base, a second guide rail assembly, and a second die. The second template base is mounted on the second guide rail assembly, and the second die is mounted on the second template base. The die is mounted in combination with the template base and the guide rail assembly to achieve high-precision guidance during the die closing process, preventing die misalignment and squeezing of the preform 400. The straightening device 7 is directly mounted on top of the die, 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.

[0042] The blow molding machine of this utility model has at least the following beneficial technical effects:

[0043] 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.

[0044] 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 device 7 corrects the transfer deviation in real time, and the preform mold alignment is greatly improved.

[0045] The working principle of the blow molding machine of this utility model is as follows:

[0046] S1: Initial positioning stage of bottle preform 400; bottle preform 400 is placed on preform insertion head 23, and the self-rotation drive device 3 drives gear 21 to rotate through arc-shaped gear ring 31; the 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, the rotating shaft 22 is blocked and stops rotating (gear 21 idles), and the initial positioning of the tooth is completed;

[0047] S2: Preform 400 transfer and de-preform stage; the left clamp 41 and right clamp 42 of the de-preform device 4 clamp the washer 26, and the cylinder 431 drives the preform 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 device 8 clamps the preform 400 to complete the non-destructive separation.

[0048] S3: Secondary correction stage before molding; After the preform 400 is transferred to the molding mold system 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.

[0049] S4: Blow molding after mold closing.

[0050] This invention's blow molding machine process overcomes the long-standing problems of poor precision and high scrap rate in the blow molding machine tooth positioning industry through a dual guarantee mechanism of "initial positioning ball bearing friction reduction" and "dynamic secondary correction by correction device". At the same time, it achieves zero human intervention in a fully automated production line, meeting the stringent quality requirements of high-end bottle types (such as pharmaceutical bottles and cosmetic bottles).

[0051] 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 rotating device of a bottle blowing machine, characterized by: The device includes a rotating housing, a rotating shaft, a preform inserter, and a toothed positioning assembly. The rotating housing has a through-hole, and the rotating shaft is installed inside the through-hole. The preform inserter is fixedly installed at the bottom end of the rotating shaft. The toothed positioning assembly includes a positioning seat, a ball bearing, and a rotating positioning element. One end of the positioning seat has 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. The rotating positioning element is mounted on the other end of the positioning seat via a torsion spring. The rotating positioning element includes a positioning piece for engaging the preform in a preform slot.

2. A rotating device of a bottle blowing machine according to claim 1, characterized in that: The through hole is connected to a first mounting groove for installing ball bearings, and the first mounting groove is connected to a second mounting groove for installing a fourth C-shaped retaining ring. The inner diameter of the first mounting groove is larger than the inner diameter of the through hole and smaller than the inner diameter of the second mounting groove. The lower outer wall of the rotating shaft is recessed with a third mounting groove for installing ball bearings, and the third mounting groove is correspondingly set with the first mounting groove.

3. The self-rotating device of the blow molding machine as described in claim 2, characterized in that: The tooth positioning assembly also includes a guide bracket; the positioning seat forms a through hole for the guide bracket to pass through, the upper end of the guide bracket is connected to the rotating housing, and the bottom end of the guide bracket passes through the through hole.

4. The self-rotating device of the blow molding machine as described in claim 3, characterized in that: It also includes a gear, a ring magnet, a washer, a spacer ring, a first bearing component, a first pad, a spring, a second pad, and a second bearing component; the gear is mounted on the upper outer wall of the rotating shaft; the ring 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 ring magnet is assembled inside the washer.

5. The self-rotating device of the blow molding machine as described in claim 4, characterized in that: It also includes a first C-shaped retaining ring and a second C-shaped retaining ring; the rotating housing is further recessed with a first mounting groove for installing the first C-shaped retaining ring and a second mounting groove for installing the second C-shaped retaining ring, the inner diameters of the first mounting groove and the second mounting groove being larger than the inner diameter of the mounting cavity; the top surface of the first bearing component abuts against the bottom surface of the first C-shaped retaining ring, and the bottom surface of the second bearing component abuts against the top surface of the second C-shaped retaining ring; the inner wall of the rotating housing is further recessed with a third mounting groove for installing the first bearing component and a fourth mounting groove for installing the second bearing component, the inner diameters of the third mounting groove and the fourth mounting groove being larger than the inner diameter of the mounting cavity and smaller than the inner diameters of the first mounting groove and the second mounting groove.

6. The self-rotating device of the blow molding machine as described in claim 5, characterized in that: It also includes a third C-shaped buckle, with a third C-shaped buckle groove formed on the outer wall of the rotating shaft for installing the third C-shaped buckle, and the second pad is mounted on the third C-shaped buckle.

7. The self-rotating device of the blow molding machine as described in claim 6, 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.

8. The self-rotating device of the blow molding machine as described in claim 7, characterized in that: The rotating housing includes a connecting portion for engaging with the annular conveyor.

Images