Bottle blank stretching mechanism of bottle blowing machine

Abstract

The utility model relates to the technical field of bottle blowing machines, in particular to a bottle blank stretching mechanism of a bottle blowing machine, which comprises a fixing support, a stretching rod fixing seat is arranged in the fixing support, a plurality of groups of stretching rods are fixedly connected onto the stretching rod fixing seat, and a plurality of groups of bottle blank seats for the top ends of the stretching rods to penetrate through are arranged at the top end of the fixing support. The servo motor is started to enable the lead screw to rotate under the transmission action of the first gear, the second gear and the toothed belt, and the lead screw drives the stretching rod fixing seat upwards or downwards while rotating, so that the stretching rod fixing seat is controlled to move up and down; when the stretching rod fixing seat moves to a proper position to enable the stretching rod to stretch a bottle blank to the required length, the servo motor is closed to control the output shaft of the stretching rod fixing seat to stop rotating, the stretching rod fixing seat can be kept fixed under the locking action of the lead screw and the threaded sleeve, and the locked stretching rod fixing seat can be kept fixed all the time; therefore, the forming quality of the bottle blank is effectively ensured.

Description

Technical Field

[0001] This utility model relates to the field of blow molding machine technology, and more specifically, to a preform stretching mechanism for a blow molding machine. Background Technology

[0002] A blow molding machine is a machine that blows preforms into bottles using certain processes. Blow molding machines usually require a stretching mechanism. Before the preform is inflated, the stretching mechanism can evenly stretch the heated preform to the required length from the inside. This ensures that the preform can expand and deform evenly when inflated, resulting in a bottle with uniform wall thickness.

[0003] Chinese patent CN202742661U discloses a motor-driven preform stretching device, which solves the technical problems of current preform stretching devices that are all cylinder-driven, resulting in slow speed, large impact force, and inconvenient stretching length adjustment. During operation, the device uses a motor to drive a gear, which in turn drives a meshing rack to move up and down. This causes the stretching rod holder to move up and down under the rack's influence. During this process, the stretching rod on the holder stretches the preform. However, the gear and rack driving the holder do not lock it. When the preform is stretched to the appropriate length and the motor needs to be turned off, the holder is prone to displacement and cannot be kept stationary. Therefore, during the inflation process after stretching, it is difficult to ensure that the stretching rod provides stable support to the preform, thus affecting the preform's molding quality. Utility Model Content

[0004] This invention provides a preform stretching mechanism for a blow molding machine, which solves the technical problem in the prior art where, when the preform is stretched to a suitable length and the motor needs to be turned off, the stretching rod fixing seat is prone to displacement and difficult to keep stationary, thus affecting the molding quality of the preform.

[0005] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0006] A preform stretching mechanism for a blow molding machine includes a fixed bracket. A stretching rod fixing seat is disposed inside the fixed bracket. Several sets of stretching rods are fixedly connected to the stretching rod fixing seat. Several sets of preform seats are disposed at the top of the fixed bracket for the top ends of the stretching rods to pass through. A lead screw is rotatably connected inside the fixed bracket. A threaded sleeve is disposed on the stretching rod fixing seat and threaded onto the lead screw. A servo motor is fixedly mounted at the rear bottom end of the fixed bracket. One end of the output shaft of the servo motor is connected to a first gear, and the bottom end of the lead screw is connected to a second gear. The first gear and the second gear are connected by a toothed belt.

[0007] Furthermore, slide rails are installed on both sides of the fixed bracket, and sliders are fixedly connected to both sides of the tension rod fixing seat, with the sliders slidably connected to the slide rails.

[0008] Furthermore, two sets of reinforcing rods are fixedly connected between the upper and lower ends of the fixed bracket.

[0009] Furthermore, the top end of the tension rod has an arc-shaped structure and a through hole is provided at the top end. The through holes are arranged in multiple groups around the top end of the tension rod.

[0010] Furthermore, several sets of sealing rings are provided on the top outer wall of the preform holder.

[0011] Furthermore, an electric telescopic rod is installed on one side of the top of the fixed bracket, a limit switch is connected to the output shaft of the electric telescopic rod, and a contact rod is fixedly connected to the telescopic rod fixing seat, which is directly opposite the bottom contact of the limit switch.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: By starting the servo motor, the lead screw rotates under the transmission action of the first gear, the second gear, and the toothed belt. While the lead screw rotates, it generates an upward or downward driving force on the tension rod fixing seat, thereby controlling the tension rod fixing seat to move up and down. When the tension rod fixing seat moves to the appropriate position so that the tension rod stretches the preform to the required length, the output shaft can be stopped by turning off the servo motor. At this time, the lead screw stops rotating because it is no longer driven. The tension rod fixing seat will remain fixed under the locking action of the lead screw and the screw sleeve. During the inflation process of the preform, the locked tension rod fixing seat can always remain fixed, so that the tension rod can stably support the preform, thereby effectively ensuring the molding quality of the preform. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0015] Figure 2 This is a side view of Embodiment 1 of the present invention;

[0016] Figure 3 This is a schematic diagram of the tension rod fixing seat in this utility model;

[0017] Figure 4 This is a schematic diagram of the through hole and sealing ring in this utility model;

[0018] Figure 5 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0019] In the diagram: 1. Fixed bracket; 2. Tension rod fixing seat; 3. Tension rod; 4. Preform holder; 5. Lead screw; 6. Screw sleeve; 7. Servo motor; 8. First gear; 9. Second gear; 10. Toothed belt; 11. Through hole; 12. Slide rail; 13. Slider; 14. Reinforcing rod; 15. Sealing ring; 16. Electric telescopic rod; 17. Limit switch; 18. Contact rod. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] Please see Figure 1-4A preform stretching mechanism for a blow molding machine includes a fixed bracket 1. A stretching rod fixing seat 2 is disposed inside the fixed bracket 1. Several sets of stretching rods 3 are fixedly connected to the stretching rod fixing seat 2. The stretching rods 3 are hollow structures with through holes 11 at their top ends. The bottom ends of the stretching rods 3 are all connected to an inflation device. When the inflation device injects gas into the bottom ends of the stretching rods 3, the gas flows out through the through holes 11 at the top ends of the stretching rods 3. Furthermore, the top ends of the stretching rods 3 pass through several sets of preform seats 4 installed at the top of the fixed bracket 1. Each set of preform seats 4 allows the preform end to be inserted into it. At this time, the stretching rods 3 passing through the preform seats 4 extend into the interior of the preform. A lead screw 5 is rotatably connected inside the fixed bracket 1. A threaded sleeve 6 is disposed on the stretching rod fixing seat 2. The threaded sleeve 6 is threaded onto the lead screw 5. When the lead screw 5 rotates relative to the threaded sleeve 6... Driven by the lead screw 5, the screw sleeve 6 moves up or down along its surface, causing the tension rod fixing seat 2 to move up and down under the action of the screw sleeve 6. When the lead screw 5 stops rotating, the screw sleeve 6 locks the lead screw 5, restricting its movement along the direction of the screw sleeve 6, thus keeping the tension rod fixing seat 2 stationary. A servo motor 7 is fixedly installed at the rear bottom of the fixing bracket 1. One end of the output shaft of the servo motor 7 is connected to a first gear 8, and the bottom end of the lead screw 5 is connected to a second gear 9. The first gear 8 and the second gear 9 are connected by a toothed belt 10. When the output shaft of the servo motor 7 drives the first gear 8 to rotate, the first gear 8 drives the second gear 9 to rotate through the transmission action of the toothed belt 10, thus allowing the second gear 9 to drive the lead screw 5 to rotate.

[0024] During use, the preform stretching mechanism inserts the preform's end into several preform seats 4 at the top of the fixed bracket 1. The stretching rod 3, passing through the preform seat 4, then extends into the preform. By activating the servo motor 7, the lead screw 5 rotates under the transmission of the first gear 8, the second gear 9, and the toothed belt 10. This rotation of the lead screw 5 drives the stretching rod fixing seat 2 upwards, causing the several sets of stretching rods 3 on it to move upwards simultaneously. As the stretching rods 3 move upwards, their tips push the preform inserted into the preform seat 4, thus stretching the inner side of the preform. When the stretching rod fixing seat 2 moves to the appropriate position, allowing the stretching rods 3 to stretch the preform to the required length, the output shaft of the servo motor 7 can be stopped by turning it off. At this point, the lead screw 5 stops rotating because it is no longer driven, and the stretching rod fixing seat 2 remains in place. The preform is held in place by the locking action of sleeve 6, which allows the tension rod 3 to stably support the preform from the inside, ensuring that the preform maintains its stretched length. During this process, the inflation device connected to the bottom of the tension rod 3 inflates the tension rod 3. The gas injected into the tension rod 3 flows into the preform through the through hole 11, causing the preform to expand and form. During this process, the stable support of the tension rod 3 effectively ensures the forming quality of the preform. After the preform is formed, the servo motor 7 is activated, causing the lead screw 5 to rotate in the opposite direction under the transmission of the first gear 8, the second gear 9, and the toothed belt 10. The rotation of the lead screw 5 simultaneously drives the tension rod fixing seat 2 downward, which in turn drives several sets of tension rods 3 on it to move downward, causing the tension rods 3 extending out of the preform seat 4 to retract and reset. After the formed preform is removed from the preform seat 4, it can be processed into subsequent preform products.

[0025] For further details, please refer to Figure 1-4 The fixed bracket 1 has slide rails 12 installed on both sides, and the tension rod fixing seat 2 has sliders 13 fixedly connected to both sides. The sliders 13 are slidably connected to the slide rails 12. During the up and down movement of the tension rod fixing seat 2, the sliders 13 will always slide up and down along the slide rails 12 under the drive of the tension rod fixing seat 2. At this time, the sliders 13 and the slide rails 12 will guide the up and down movement of the tension rod fixing seat 2, so that the tension rod fixing seat 2 remains stable and does not deflect while moving up and down.

[0026] For further details, please refer to Figure 1-4 Two sets of reinforcing rods 14 are fixedly connected between the upper and lower ends of the fixed bracket 1. The reinforcing rods 14 can support the interior of the fixed bracket 1, effectively preventing the fixed bracket 1 from deforming as a whole and ensuring the overall stability of the fixed bracket 1.

[0027] For further details, please refer to Figure 1-4The top of the tension rod 3 has an arc-shaped structure. When the tension rod 3 moves upward to push and stretch the preform, its arc-shaped top will not damage the preform. The through holes 11 are distributed in multiple groups around the top of the tension rod 3. During the inflation process, the through holes 11 distributed around the top of the tension rod 3 are not easily blocked by the inner wall of the preform, thus ensuring that the gas can be smoothly filled into the preform.

[0028] For further details, please refer to Figure 1-4 Several sets of sealing rings 15 are provided on the top outer wall of the preform holder 4. When the port of the preform is inserted into the top of the preform holder 4, the sealing rings 15 can tightly abut against the inner wall of the port of the preform and the preform, thereby improving the sealing performance of the preform and preventing gas leakage during the filling process.

[0029] Example 2

[0030] For further details, please refer to Figure 5 An electric telescopic rod 16 is installed on one side of the top of the fixed bracket 1. A limit switch 17 is connected to the output shaft of the electric telescopic rod 16. A contact rod 18 is fixedly connected to the tension rod fixing seat 2, which is directly opposite the bottom contact of the limit switch 17. When the servo motor 7 is started to control the tension rod fixing seat 2 to move upward, when the contact rod 18 on the tension rod fixing seat 2 touches the contact of the limit switch 17, the limit switch 17 will control the servo motor 7 to turn off, thereby stopping the tension rod fixing seat 2 from moving. Therefore, the user can control the limit switch 17 to move to a suitable height position in advance according to the stretching length of the preform by controlling the electric telescopic rod 16. During the process of stretching the preform by moving the tension rod 3 upward with the tension rod fixing seat 2, when the tension rod 3 stretches the preform to the required length, the contact rod 18 on the tension rod fixing seat 2 will just touch the limit switch 17. The limit switch 17 will immediately control the servo motor 7 to turn off, so that the tension rod fixing seat 2 and the tension rod 3 stop moving. This allows for precise control of the stretching length of the preform according to production needs, further improving the molding quality of the preform.

[0031] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A preform stretching mechanism for a blow molding machine, comprising a fixed bracket (1), wherein a stretching rod fixing seat (2) is provided inside the fixed bracket (1), a plurality of stretching rods (3) are fixedly connected to the stretching rod fixing seat (2), and a plurality of preform seats (4) for the top ends of the stretching rods (3) to pass through are provided at the top end of the fixed bracket (1), characterized in that, The fixed bracket (1) is internally rotatably connected to a lead screw (5), and a threaded sleeve (6) is provided on the tension rod fixing seat (2). The threaded sleeve (6) is threaded onto the lead screw (5). A servo motor (7) is fixedly installed at the rear bottom end of the fixed bracket (1). One end of the output shaft of the servo motor (7) is connected to a first gear (8), and the bottom end of the lead screw (5) is connected to a second gear (9). The first gear (8) and the second gear (9) are connected by a toothed belt (10).

2. The preform stretching mechanism of the blow molding machine according to claim 1, characterized in that, The fixed bracket (1) is equipped with slide rails (12) on both sides, and the tension rod fixing seat (2) is fixedly connected to sliders (13) on both sides, and the sliders (13) are slidably connected to the slide rails (12).

3. The bottle preform stretching mechanism of a bottle blowing machine according to claim 1, wherein Two sets of reinforcing rods (14) are fixedly connected between the upper and lower ends of the fixed bracket (1).

4. The bottle preform stretching mechanism of a bottle blowing machine according to claim 1, wherein The top end of the tension rod (3) is an arc-shaped structure, and a through hole (11) is provided at the top end. The through holes (11) are arranged in multiple groups around the top end of the tension rod (3).

5. The bottle preform stretching mechanism of a bottle blowing machine according to claim 1, wherein Several sets of sealing rings (15) are provided on the top outer wall of the preform holder (4).

6. The bottle preform stretching mechanism of a bottle blowing machine according to claim 1, wherein An electric telescopic rod (16) is installed on one side of the top of the fixed bracket (1). A limit switch (17) is connected to the output shaft of the electric telescopic rod (16). A contact rod (18) is fixedly connected to the tension rod fixing seat (2) and is directly opposite the bottom contact of the limit switch (17).

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