A stretching and sealing linkage device for a blow molding machine

Abstract

The present invention discloses a stretching and sealing linkage device for a blow molding machine, which comprises a mounting bracket, a stretching bracket arranged on the mounting bracket, a linear guide rail arranged on the stretching bracket, a stretching mechanism and a sealing mechanism; the stretching mechanism comprises a first mounting seat slidably arranged on the linear guide rail, a stretching rod arranged on the first mounting seat, and a driving assembly arranged on the stretching bracket for driving the first mounting seat; the sealing mechanism comprises a sealing cylinder arranged on the mounting bracket, a lifting rod vertically arranged through the sealing cylinder in a liftable manner, a sealing member arranged at the bottom end of the lifting rod, a first connecting rod with its lower end hinged to the top end of the lifting rod through a first shaft, and a second connecting rod with one end hinged to the stretching bracket through a second shaft, and the other end of the second connecting rod is hinged to the upper end of the first connecting rod through a third shaft; a roller is arranged on the third shaft, and a cam surface for abutting against and driving the roller to rise synchronously when rising is arranged on the first mounting seat. The device of the present invention has relatively high movement precision and good movement stability.

Description

Technical Field

[0001] The invention relates to the technical field of bottle blowing, and in particular to a stretching and sealing linkage device for a bottle blowing machine. Background Art

[0002] As the bottle blowing machine develops towards high speed and low noise, the requirements for the motion accuracy of each mechanism of the bottle blowing machine are getting higher and higher. During the execution of a bottle blowing action, the lifting and lowering actions of the sealing cylinder and the stretching rod need to be completed continuously. The lifting and lowering action of the sealing cylinder of the existing equipment is powered by a cylinder or a cam, and the lifting and lowering action of the stretching rod is powered by a cylinder or a servo motor. The two actions have two different powers, the structure is complex, and the installation accuracy is poor, which has a certain impact on the high-speed and stable operation of the equipment.

[0003] At present, there is a device that can realize the linkage between the sealing and stretching of the preform. In this device, the linkage is achieved by the mutual collision of the sliders along the sliding direction. The instantaneous impact force of the sliders in this structure is large, resulting in relatively low movement accuracy, poor movement stability, and short equipment life. Summary of the invention

[0004] The purpose of the invention is to provide a stretching and sealing linkage device for a bottle blowing machine, which has high movement accuracy and good stability.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A stretching and sealing linkage device for a bottle blowing machine, comprising a mounting bracket rotatable in a circumferential direction and arranged on a frame of the bottle blowing machine, a stretching bracket arranged on the mounting bracket, a linear guide rail arranged on the stretching bracket, a stretching mechanism, and a sealing mechanism;

[0007] The stretching mechanism comprises a first mounting seat slidably arranged on the linear guide rail, a stretching rod fixedly arranged on the first mounting seat, and a driving component arranged on the stretching bracket for driving the first mounting seat to slide;

[0008] The sealing mechanism comprises a sealing cylinder fixed on the mounting bracket, a lifting rod which can be lifted and lowered along the length extension direction thereof and is inserted into the sealing cylinder, a sealing member provided at the bottom end of the lifting rod, a first connecting rod whose lower end is hinged to the top end of the lifting rod through a first axis, a second connecting rod whose one end is hinged to the stretching bracket through a second axis, and the other end of the second connecting rod is hinged to the upper end of the first connecting rod through a third axis; the stretching rod is inserted into the sealing member;

[0009] The third shaft is provided with a roller, and the first mounting seat is provided with a cam surface for contacting and driving the roller to rise synchronously when rising.

[0010] Preferably, the cam surface slopes gradually downward and approaches the roller.

[0011] More preferably, when the first mounting seat rises, it gradually approaches and bears the roller through the cam surface and rises synchronously; when the first mounting seat descends, the roller synchronously descends under the action of gravity until it detaches from the cam surface after sealing.

[0012] Preferably, the first shaft, the second shaft and the third shaft are parallel to each other and perpendicular to the linear guide rail.

[0013] Preferably, the first mounting seat is located below the second connecting rod and between the linear guide rail and the first connecting rod.

[0014] Preferably, the sealing mechanism further includes a second mounting seat slidably arranged on the linear guide rail. The lifting rod is fixedly connected to the second mounting seat through the first shaft, and the second mounting seat is arranged below the first mounting seat.

[0015] More preferably, the stretching rod sequentially passes downward through the second mounting seat, the lifting rod and the sealing member.

[0016] More preferably, both ends of the first shaft pass through the second mounting seat, and symmetrically distributed connecting rod mechanisms are respectively connected to both ends of the first shaft. The connecting rod mechanism includes the first connecting rod, the third shaft, the second connecting rod and the second shaft connected in sequence.

[0017] Preferably, the driving assembly is a servo motor.

[0018] Preferably, the driving assembly is a driving cylinder. A rotor is arranged on the first mounting seat, and a limiting cam abutted against the rotor is arranged on the blow molding machine frame.

[0019] Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: In a stretching and sealing linkage device of a blow molding machine according to the present invention, by the cam surface abutting against the roller on the third shaft with flexible freedom, the linkage between the bottle preform sealing and stretching is realized. The contact between the two is gentle and controllable, with relatively high movement precision and good movement stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 is a schematic structural diagram of Embodiment 1 of the device of the present invention Figure 1 (sealing state);

[0021] Attached Figure 2 is a schematic structural diagram of Embodiment 1 of the device of the present invention Figure 2 (unsealed state);

[0022] Attached Figure 3 is attachedFigure 2 Right view;

[0023] Appendix Figure 4 Position appendix Figure 2 Enlarged schematic view of A in the appendix;

[0024] Appendix Figure 5 Structural schematic diagram (unsealed state) of the second embodiment of the device of the present invention;

[0025] Appendix Figure 6 For appendix Figure 5 Right view.

[0026] Wherein: 1. Installation bracket; 2. Tensile bracket; 3. Linear guide rail; 4. First mounting seat; 5. Tensile rod; 6. Sealing cylinder; 7. Lifting rod; 8. Sealing member; 9. First shaft; 10. First connecting rod; 11. Second shaft; 12. Second connecting rod; 13. Third shaft; 14. Roller; 15. Cam surface; 16. Second mounting seat; 17. Servo motor; 18. Driving cylinder; 19. Fourth shaft; 20. Rotor; 21. Limiting cam. Specific embodiments

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0028] See Figures 1-6 As shown, the above-mentioned stretching and sealing linkage device of a blow molding machine includes an installation bracket 1 rotatably arranged on a blow molding machine frame (not shown in the figure) along the circumferential direction, a stretching bracket 2 arranged on the installation bracket 1, a linear guide rail 3 arranged on the stretching bracket 2, a stretching mechanism, and a sealing mechanism. In this embodiment, both the stretching bracket 2 and the linear guide rail 3 extend in the vertical direction, and the linear guide rail 3 is located on the side of the stretching bracket 2 close to the sealing mechanism.

[0029] The above-mentioned stretching mechanism includes a first mounting seat 4 slidably arranged on the linear guide rail 3 along the length extension direction of the linear guide rail 3, a tensile rod 5 fixed on the first mounting seat 4, and a driving assembly arranged on the stretching bracket 2 for driving the first mounting seat 4 to slide up and down. In this embodiment, the tensile rod 5 extends in the vertical direction and is used to penetrate downward into the preform to stretch the preform downward.

[0030] The above-mentioned sealing mechanism includes a sealing cylinder 6 fixed on the installation bracket 1, a lifting rod 7 slidably arranged in the sealing cylinder 6 along its own length extension direction, and a sealing member 8 arranged at the bottom end of the lifting rod 7 for sealing the mouth of the preform. In this embodiment, the sealing cylinder 6, the lifting rod 7, and the sealing member 8 extend coaxially, and their axis lines all extend in the vertical direction. The sealing cylinder 6 is located above the installation bracket 1, the sealing member 8 is located below the installation bracket 1, and both the upper and lower ends of the lifting rod 7 penetrate through the sealing cylinder 6.

[0031] SeeFigure 1 As shown, the above-mentioned sealing mechanism further includes a first connecting rod 10 whose lower end is hinged to the top end of the lifting rod 7 through a first shaft 9, and a second connecting rod 12 whose one end is hinged to the stretching bracket 2 through a second shaft 11. The other end of the second connecting rod 12 is hinged to the upper end of the first connecting rod 10 through a third shaft 13. In this embodiment, the first shaft 9 is fixed to the top end of the lifting rod 7, the second shaft 11 is fixed to the stretching bracket 2, the left end of the second connecting rod 12 is hinged to the second shaft 11, and the right end is hinged to the upper end of the first connecting rod 10 through the third shaft 13. The third shaft 13 has a flexible degree of freedom. The first shaft 9, the second shaft 11, and the third shaft 13 are parallel to each other and perpendicular to the linear guide rail 3. The first mounting seat 4 is located below the second connecting rod 12 and between the linear guide rail 3 and the first connecting rod 10.

[0032] The above-mentioned sealing mechanism further includes a second mounting seat 16 slidably disposed on the linear guide rail 3 along the length extension direction of the linear guide rail 3. The lifting rod 7 is fixedly connected to the second mounting seat 16 through the first shaft 9, and the second mounting seat 16 is disposed below the first mounting seat 4. Specifically, the first shaft 9 is fixedly connected to the second mounting seat 16, and the upper end of the lifting rod 7 is fixedly connected to the first shaft 9. By providing the second mounting seat 16, it plays a role in stabilizing and guiding the lifting movement of the lifting rod 7. In this embodiment, the above-mentioned stretching rod 5 sequentially passes through the second mounting seat 16, the lifting rod 7, and the sealing member 8 downward to enter the preform.

[0033] In this embodiment, both ends of the first shaft 9 pass through the second mounting seat 16, and symmetrically distributed link mechanisms are respectively connected to both ends of the first shaft 9. The linear guide rail 3 is located between the two sets of link mechanisms. The link mechanism includes a first connecting rod 10, a third shaft 13, a second connecting rod 12, and a second shaft 11 connected in sequence. The two sets of link mechanisms act synchronously. Through this setting, the stability of the linkage action is ensured.

[0034] A roller 14 is provided on the above-mentioned third shaft 13, and a cam surface 15 for abutting and driving the roller 14 to rise synchronously when rising is provided on the first mounting seat 4. In this embodiment, the roller 14 is rotatably disposed coaxially on the third shaft 13, and the cam surface 15 is disposed on the right side of the first mounting seat 4 (see Figure 2 shown). The cam surface 15 is a cam curved surface, which gradually inclines downward and approaches the roller 14. Before and after the two abut and before separation, the roller 14 rotates and abuts on the cam curved surface. By setting the shape of the cam curved surface, when the first mounting seat 4 rises, the cam curved surface gradually approaches, abuts, and bears the roller 14. The contact between the two is gentle and controllable, making the accuracy of the linkage movement relatively high and the stability relatively good. Obviously, the cam curved surface has a bottom for bearing the roller 14.

[0035] When the first mounting seat 4 rises, it gradually approaches the cam surface 15 and carries the roller 14 to rise synchronously; when the first mounting seat 4 descends, the roller 14 descends synchronously under the action of gravity (the roller 14, the first connecting rod 10, the second connecting rod 12, the second mounting seat 16, the lifting rod 7, and the sealing member 8 can be regarded as a whole, under the action of the overall gravity) until it is separated from the cam surface 15 after sealing.

[0036] See also Figures 1-4 As shown, in the first embodiment, the driving component is a servo motor 17 .

[0037] See also Figures 5-6 As shown, in the second embodiment, the driving assembly is a driving cylinder 18, which can be a pneumatic cylinder or a hydraulic cylinder. A fourth shaft 19 is provided on the first mounting seat 4, and a rotor 20 is provided on the fourth shaft 19 so as to be rotatable around the axis of the fourth shaft 19. A limit cam 21 is provided on the frame of the bottle blowing machine to abut against the rotor 20. In this embodiment, the fourth shaft 19 extends in the horizontal direction and is perpendicular to the third shaft 13. The fourth shaft 19 is provided on the right side of the first mounting seat 4 (see Figure 5 As shown in FIG. 1 , the limit cam 21 is located below the rotor 20. Since the stroke of the driving cylinder 18 is uncontrollable, the stroke of the up and down movement of the first mounting seat 4 can be controlled by providing the rotor 20 and the limit cam 21. In other words, during the lifting process of the first mounting seat 4, the rotor 20 always abuts against the limit cam 21. In order to avoid interference, the rolling path of the roller 14 on the cam surface 15 is staggered with the fourth axis 19.

[0038] The working process of this embodiment is described in detail below:

[0039] When the preform needs to be sealed, the driving assembly drives the first mounting seat 4 to move downward, and the roller 14 and the lifting rod 7 move downward synchronously under the action of gravity until the sealing member 8 contacts the mouth of the preform to seal, and then the first mounting seat 4 continues to move downward and separates from the roller 14 until the stretching rod 5 drops to the set height, completing the stretching action on the preform;

[0040] Pressurized gas is introduced into the bottle blank to blow the bottle. After the blowing is completed, the driving component drives the first mounting seat 4 to move upward, and the cam surface 15 contacts the roller 14 and drives the roller 14 to move upward synchronously, so that the sealing member 8 is separated from the mouth of the bottle body. The driving component continues to drive the first mounting seat 4 to move upward until the stretching rod 5 is completely withdrawn from the bottle body.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A stretching and sealing linkage device for a blow molding machine, comprising a mounting bracket rotatably arranged on the blow molding machine frame along the circumferential direction, characterized in that: The device also includes a stretching bracket arranged on the mounting bracket, a linear guide rail arranged on the stretching bracket, a stretching mechanism, and a sealing mechanism; The stretching mechanism comprises a first mounting seat slidably arranged on the linear guide rail, a stretching rod fixedly arranged on the first mounting seat, and a driving component arranged on the stretching bracket for driving the first mounting seat to slide; The sealing mechanism comprises a sealing cylinder fixed on the mounting bracket, a lifting rod which can be lifted and lowered along the length extension direction thereof and is inserted into the sealing cylinder, a sealing member provided at the bottom end of the lifting rod, a first connecting rod whose lower end is hinged to the top end of the lifting rod through a first axis, a second connecting rod whose one end is hinged to the stretching bracket through a second axis, and the other end of the second connecting rod is hinged to the upper end of the first connecting rod through a third axis; the stretching rod is inserted into the sealing member; The third shaft is provided with a roller, and the first mounting seat is provided with a cam surface for contacting and driving the roller to rise synchronously when rising; The sealing mechanism further comprises a second mounting seat slidably arranged on the linear guide rail, the lifting rod is fixedly connected to the second mounting seat through the first shaft, and the second mounting seat is arranged below the first mounting seat; Both ends of the first shaft pass through the second mounting seat, and both ends of the first shaft are respectively connected with symmetrically distributed connecting rod mechanisms, and the connecting rod mechanism includes the first connecting rod, the third shaft, the second connecting rod and the second shaft which are connected in sequence; The axis center line of the third axis is parallel to the arrangement direction of the two second connecting rods; The cam surface gradually tilts from top to bottom and approaches the roller; When the first mounting seat rises, the cam surface gradually approaches and carries the roller to rise synchronously; when the first mounting seat descends, the roller descends synchronously under the action of gravity until it is separated from the cam surface after sealing.

2. The stretching and sealing linkage device of a blow molding machine according to claim 1, characterized in that: The first axis, the second axis and the third axis are parallel to each other and perpendicular to the linear guide rail.

3. A stretching and sealing linkage device for a blow molding machine according to claim 1, characterized in that: The first mounting seat is located below the second connecting rod and between the linear guide rail and the first connecting rod.

4. A stretching and sealing linkage device for a blow molding machine according to claim 1, characterized in that: The stretching rod passes downward through the second mounting seat, the lifting rod and the sealing member in sequence.

5. A stretching and sealing linkage device for a bottle blowing machine according to claim 1, characterized in that: The driving component is a servo motor.

6. A stretching and sealing linkage device for a blow molding machine according to claim 1, characterized in that: The driving assembly is a driving cylinder, the first mounting seat is provided with a rotor, and the bottle blowing machine frame is provided with a limiting cam that abuts against the rotor.

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