On-line rotating finish cutting device in a hollow blow molding machine

Abstract

This invention belongs to the field of plastic bottle processing technology, specifically relating to an online rotary bottle neck cutting device for a hollow blow molding machine. It includes a speed-changing mechanism and a pitch-changing cutting mechanism. A drive motor is mounted at the top of the speed-changing mechanism, and the output end of the drive motor is connected to a rotating shaft. A bottle neck support block is mounted on the bottom end of the rotating shaft, passing through the speed-changing mechanism. A first bevel gear is mounted on the rotating shaft, and a sleeve is fitted onto the rotating shaft. The sleeve is fixed to the bottom wall of the speed-changing chamber via a first bearing. A second bevel gear is fixed to the outer wall of the top end of the sleeve. Both the first and second bevel gears are located within the speed-changing chamber of the speed-changing mechanism and are driven by a third bevel gear. A pitch-changing cutting mechanism is fixedly connected to the bottom side wall of the sleeve. By setting up a speed-changing mechanism, this invention allows the sleeve and the rotating shaft to output rotational speeds in opposite directions, thereby making the rotation direction of the cutting blade opposite to the rotation direction of the bottle neck support block, achieving a better extrusion cutting effect.

Description

Technical Field

[0001] This invention belongs to the field of plastic bottle processing technology, specifically relating to an online rotating bottle neck cutting device in a hollow blow molding machine. Background Technology

[0002] Currently, most plastic bottle processing uses hollow blow molding. In this process, after the plastic bottle is mechanically blow-molded, there is excess material left at the bottle neck. This material usually needs to be cleaned manually, which is inefficient. Later, mechanical devices for bottle neck cutting were developed. These devices mainly cut the material by the squeezing and cutting action of a bottle neck support block and a rotating cutting blade. However, since only the cutting blade rotates relative to the bottle neck support block, the cutting effect is often poor. Furthermore, the bottle neck support block and cutting blade of existing bottle neck cutting devices are fixed and cannot be adjusted, making them unsuitable for cutting bottle necks of different diameters. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides an online rotating bottle neck cutting device for a hollow blow molding machine, and specifically discloses the following technical solution:

[0004] An online rotary bottle neck cutting device for a hollow blow molding machine includes a speed-changing mechanism and a pitch-changing cutting mechanism. A drive motor is mounted at the top of the speed-changing mechanism, and a rotating shaft is connected to the output end of the drive motor. A bottle neck support block is installed at the bottom end of the rotating shaft, which passes through the speed-changing mechanism. A first bevel gear is mounted on the rotating shaft, and a sleeve is fitted below the first bevel gear. The sleeve passes through the bottom wall of the speed-changing cavity of the speed-changing mechanism and is fixed to the bottom wall of the speed-changing cavity by a first bearing. A second bevel gear is fixed to the outer wall of the top end of the sleeve. Both the first and second bevel gears are located within the speed-changing cavity of the speed-changing mechanism and are driven by a third bevel gear. A gear shaft is connected to the third bevel gear, with one end fixed to the third bevel gear and the other end mounted on the side wall of the speed-changing cavity by a second bearing and a bearing seat. The bottom end of the sleeve is located outside the speed-changing cavity, and a pitch-changing cutting mechanism is fixedly connected to the side wall of the bottom end.

[0005] Furthermore, the variable-pitch cutting mechanism includes a variable-pitch inner cavity, with grooves at both the top and bottom of the variable-pitch inner cavity. A slider is slidably installed between the two grooves. The side of the slider is connected to the side wall of the variable-pitch inner cavity via a hydraulic telescopic rod. A strip-shaped through hole is provided at the bottom of the variable-pitch inner cavity. A blade holder is fixedly connected to the bottom of the slider, and a cutting blade is installed at the bottom of the blade holder through the strip-shaped through hole.

[0006] Furthermore, the bottom sidewall of the rotating shaft is provided with external threads, the bottle mouth support block is provided with threaded holes, and the rotating shaft is threadedly connected to the bottle mouth support block.

[0007] Furthermore, the bottom end of the bottle neck support block is designed as a gradually narrowing arc surface.

[0008] Furthermore, the drive motor is a servo motor, and the drive motor is fixed to the top of the transmission mechanism via a motor support.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0010] This invention, by setting a speed-changing mechanism, allows the sleeve and the rotating shaft to output rotational speeds in opposite directions, thereby making the rotation direction of the cutting blade opposite to that of the bottle mouth support block, achieving a better extrusion cutting effect. The entire device has a compact structure and small size, and the cutting blade and the bottle mouth support block can be driven simultaneously by the same drive motor, making it easier to use on the production line. In this invention, the bottle mouth support block and the rotating shaft are connected by a thread, which facilitates the replacement of different models of bottle mouth support blocks to meet the cutting requirements of bottle mouths of different diameters. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0012] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0013] 1-Drive motor, 2-Rotating shaft, 3-Bottle mouth support block, 4-First bevel gear, 5-Sleeve, 6-Second bevel gear, 7-Third bevel gear, 8-Gear shaft, 9-Bearing seat, 10-First bearing, 11-Slide groove, 12-Slider, 13-Hydraulic telescopic rod, 14-Strip through hole, 15-Knife holder, 16-Cutting knife, 17-Motor support seat, 18-Telescopic mechanism. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Reference Figure 1-2An online rotary bottle neck cutting device for a hollow blow molding machine includes a speed-changing mechanism and a pitch-changing cutting mechanism. A drive motor 1 is mounted at the top of the speed-changing mechanism, and a rotating shaft 2 is connected to the output end of the drive motor 1. A bottle neck support block 3 is installed at the bottom end of the rotating shaft 2, passing through the speed-changing mechanism. A first bevel gear 4 is mounted on the rotating shaft 2, and a sleeve 5 is fitted below the first bevel gear 4. The sleeve 5 passes through the bottom wall of the speed-changing cavity of the speed-changing mechanism and is fixed to the bottom wall of the speed-changing cavity by a first bearing 10. A second bevel gear 6 is fixed to the outer wall of the top end of the sleeve 5. Both the first bevel gear 4 and the second bevel gear 6 are located within the speed-changing cavity of the speed-changing mechanism and are meshed and driven by a third bevel gear 7. A gear shaft 8 is connected to the third bevel gear 7. One end of the gear shaft 8 is fixed to the third bevel gear 7, and the other end is mounted on the side wall of the speed-changing cavity via a second bearing and a bearing seat 9. The bottom end of the sleeve 5 is located outside the speed-changing cavity, and a pitch-changing cutting mechanism is fixedly connected to the side wall of the bottom end.

[0016] The first bevel gear 4 and the second bevel gear 6 have the same number of teeth and module, and mesh with the third bevel gear 7 at the same time. Therefore, their rotation speeds are the same but opposite in direction. The bottle mouth support block 3 driven by them also rotates in the opposite direction to the variable pitch cutting mechanism, thereby generating a relatively large relative speed between the bottle mouth support block 3 and the variable pitch cutting mechanism to improve the extrusion cutting effect.

[0017] In this embodiment, the variable-pitch cutting mechanism includes a variable-pitch inner cavity. The top and bottom ends of the variable-pitch inner cavity are provided with sliding grooves 11. A slider 12 is slidably installed between the two sliding grooves 11. The side of the slider 12 is connected to the side wall of the variable-pitch inner cavity through a hydraulic telescopic rod 13. The bottom end of the variable-pitch inner cavity is provided with a strip-shaped through hole 14. A knife holder 15 is fixedly connected to the bottom end of the slider 12. A cutting blade 16 is installed through the strip-shaped through hole 14 at the bottom end of the knife holder 15.

[0018] Before the bottle neck support block 3 is inserted into the bottle neck, the cutting blade 16 is located away from the bottle neck support block 3. After the bottle neck support block 3 is successfully inserted into the bottle neck and remains stable, the hydraulic telescopic rod 13 gradually begins to retract, driving the slider 12 to slide in the slide groove 11, which in turn drives the blade holder 15 to move in the strip-shaped through hole 14, so that the cutting blade 16 gradually approaches the bottle neck support block 3 until the blade tip of the cutting blade 16 is close to the bottle neck support block 3 and successfully cuts off the bottle neck residue. Then the hydraulic telescopic rod 13 extends again, so that the cutting blade 16 returns to its original position.

[0019] In this embodiment, the bottom sidewall of the rotating shaft 2 is provided with external threads, and the bottle mouth support block 3 is provided with threaded holes. The rotating shaft 2 is threadedly connected to the bottle mouth support block 3. By replacing different models of bottle mouth support blocks 3, the cutting requirements of bottle mouths of different diameters can be met.

[0020] In this embodiment, the bottom end of the bottle mouth support block 3 is set as a gradually narrowing arc surface, so that the bottle mouth support block 3 can be more easily inserted into the bottle mouth.

[0021] In this embodiment, the drive motor 1 is a servo motor, and the drive motor 1 is fixed to the top of the speed change mechanism by the motor support 17, thereby making the drive motor 1 more stable.

[0022] In this embodiment, the top end of the speed change mechanism is fixedly connected to the free end of the telescopic mechanism 18. The telescopic mechanism 18 can drive the speed change mechanism and the variable pitch cutting mechanism to lift and lower, so as to successfully complete the cutting work.

[0023] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An online rotary bottle neck cutting device for a hollow blow molding machine, characterized in that, The device includes a speed-changing mechanism and a pitch-changing cutting mechanism. A drive motor is mounted at the top of the speed-changing mechanism, and a rotating shaft is connected to the output end of the drive motor. A bottle neck support block is installed at the bottom end of the rotating shaft, which passes through the speed-changing mechanism. A first bevel gear is mounted on the rotating shaft, and a sleeve is fitted below the first bevel gear. The sleeve passes through the bottom wall of the speed-changing cavity of the speed-changing mechanism and is fixed to the bottom wall of the speed-changing cavity by a first bearing. A second bevel gear is fixed to the outer wall of the top end of the sleeve. Both the first and second bevel gears are located within the speed-changing cavity of the speed-changing mechanism and are driven by a third bevel gear. A gear shaft is connected to the third bevel gear, with one end fixed to the third bevel gear and the other end mounted on the side wall of the speed-changing cavity via a second bearing and a bearing seat. The bottom end of the sleeve is located outside the speed-changing cavity, and a pitch-changing cutting mechanism is fixedly connected to the side wall of the bottom end.

2. The online rotary bottle neck cutting device in a hollow blow molding machine according to claim 1, characterized in that, The variable-pitch cutting mechanism includes a variable-pitch inner cavity. The top and bottom of the variable-pitch inner cavity are provided with sliding grooves. A slider is slidably installed between the two sliding grooves. The side of the slider is connected to the side wall of the variable-pitch inner cavity through a hydraulic telescopic rod. The bottom of the variable-pitch inner cavity is provided with a strip-shaped through hole. A knife holder is fixedly connected to the bottom of the slider. A cutting knife is installed through the strip-shaped through hole at the bottom of the knife holder.

3. The online rotary bottle neck cutting device in a hollow blow molding machine according to claim 1, characterized in that, The bottom sidewall of the rotating shaft is provided with external threads, the bottle mouth support block is provided with threaded holes, and the rotating shaft is threadedly connected to the bottle mouth support block.

4. The online rotary bottle neck cutting device in a hollow blow molding machine according to claim 1, characterized in that, The bottom end of the bottle neck support block is designed as a gradually narrowing arc surface.

5. The online rotary bottle neck cutting device in a hollow blow molding machine according to claim 1, characterized in that, The drive motor is a servo motor, and the drive motor is fixed to the top of the speed change mechanism by a motor support.

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