CN111361129A

CN111361129A - Bottle blowing system and method for polypropylene bottle

Info

Publication number: CN111361129A
Application number: CN202010184788.1A
Authority: CN
Inventors: 董辉; 董思宇; 于晓慧; 董花; 吕鑫; 曲有军; 韩东; 华新
Original assignee: Zhejiang Dubang Pharmaceutical Co ltd
Current assignee: Zhejiang Dubang Pharmaceutical Co ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2020-07-03
Anticipated expiration: 2040-03-17
Also published as: CN111361129B

Abstract

The invention relates to a bottle blowing system of polypropylene bottles and a method thereof, which comprises a molding module at least provided with two bottle blowing cavities for accommodating bottle blanks, a bottle blowing module used for being matched with the molding module and used for inflating the bottle blanks, a guide module used for suspending the bottle blanks and guiding the bottle blanks into the bottle blowing cavities, a driving module used for driving the bottle blanks on the guide module to move and a control module used for controlling the discharge of the output end of the guide module; the invention has the beneficial effects that: high quality and good effect.

Description

Bottle blowing system and method for polypropylene bottle

Technical Field

The invention relates to the technical field of polypropylene bottle preparation, in particular to a bottle blowing system and a method of a polypropylene bottle.

Background

The polypropylene bottle is a container for storing medicines or medicaments, and most of the prior polypropylene bottle production is performed by the die-casting forming of bottle blanks and the expansion of the bottle blanks, wherein the expansion of the bottle blanks is mainly realized by blowing gas into the bottle blanks, and the bottle blanks are gradually expanded by using the expansion force of the gas (such as hot gas) and finally formed; moreover, at present, when bottle blowing, blow to the bottle embryo of the same group and can't accomplish balanced', promptly: the blowing amount of the same group of bottle blanks is different, so the bottle blowing effect of each bottle blank is further caused, and the preparation effect is further influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a bottle blowing system and a method of a polypropylene bottle, and aims to solve the problems in the background technology.

The technical scheme of the invention is realized as follows: a bottle blowing system of polypropylene bottles is characterized in that: the automatic bottle blowing device comprises a molding module at least provided with two bottle blowing cavities for accommodating bottle blanks, a bottle blowing module, a guide module, a driving module and a control module, wherein the bottle blowing module is used for being matched with the molding module and inflating the bottle blanks; the bottle blowing module comprises a first mounting plate and a second mounting plate which are arranged at intervals, a first air cylinder and a second air cylinder which are respectively used for driving the first mounting plate and the second mounting plate to lift, a plurality of first air outlet nozzles and a plurality of second air outlet nozzles which are respectively arranged on the first mounting plate and the second mounting plate, and an air supply device used for supplying air to the first air outlet nozzles and the second air outlet nozzles; the air supply device comprises a first air supply system for supplying air to the first air outlet nozzles and a second air supply system for supplying air to the second air outlet nozzles.

Preferably: the first type air supply system and the second type air supply system respectively comprise an air source device which is used for supplying air and is provided with an input end and an output end, and the first type air supply system and the second type air supply system respectively comprise a first type air supply module and a second type air supply module which are communicated with the output end of the air source device; the first type air supply module comprises a main pipeline communicated with the output end of the air source device, the output end of the main pipeline forms a node, and a plurality of branch pipelines for supplying air to the first air outlet nozzles are respectively connected in series at the node; the second type air supply module comprises a control valve which is communicated with the output end of the air source device through a first pipeline and is provided with an input end and a plurality of output ends, and a plurality of second pipelines which are communicated with the output ends of the control valve and are used for supplying air to a second air outlet nozzle; the control device also comprises a central control unit which generates electric signals to the control valve and the air source device so as to switch the working state.

Preferably: the air source device comprises a main pump and a plurality of auxiliary pumps, wherein the main pump supplies air to each group of first air outlet nozzles or each group of second air outlet nozzles respectively; the main control system comprises a main control part, a main pipeline and a secondary motor, wherein a communication interface between a first controller used for controlling the main motor and a second controller used for controlling the secondary motor is electrically connected to form a connection mode, the air inflow of the main pump is selected on a control panel of the main control part, the first controller is driven to control the main motor to work according to the selected air inflow, an electric signal is sent to the second controller, the second controller controls the secondary motor to operate according to the selected air inflow based on the signal, and the main pump and the secondary pump are controlled to supply air to the main pipeline or the first pipeline.

Preferably: the forming module comprises a horizontal rotating shaft driven by a first motor, a plurality of forming parts which are circumferentially and equidistantly arranged on the circumferential side wall of the horizontal rotating shaft at intervals, and a plurality of tightening parts which are arranged on the horizontal rotating shaft and correspond to the forming parts one by one; the forming part comprises support plates which are arranged on the horizontal rotating shaft at intervals, a frame which is connected between the support plates through a rotating shaft in a rotating mode and is provided with an accommodating space, a plurality of third air cylinders which are hinged to the inner walls of two sides of the accommodating space, and forming dies which are fixedly connected with the output ends of the third air cylinders respectively and are hinged to each other; each forming die comprises a die body fixedly connected with the output end of the third cylinder and a semi-cavity arranged on the matching surface of each die body and capable of being combined into a bottle blowing cavity, and each die body is also provided with a hinge shaft and a shaft sleeve which are matched with each other.

Preferably: the guide module comprises a plurality of pairs of guide rails, each pair of guide rails consists of a first guide rail and a second guide rail which are arranged at intervals, and each of the first guide rail and the second guide rail comprises a moving part extending horizontally, a rotating hole arranged at the output end of the moving part and an arc-shaped part which is rotatably connected with the rotating hole through a rotating shaft and extends towards the orifice of the bottle blowing cavity.

Preferably: a hanging ring is fixed on the frame; the tightening part comprises second motors which are arranged on the horizontal rotating shaft and correspond to the frames one by one, reels which are arranged at the output ends of the second motors, and tightening ropes which are wound on the reels and one ends of which are connected with the hanging rings.

Preferably: the driving module comprises a conveying belt which is arranged above each pair of guide rails and is driven by a third motor and a plurality of moving rods which are fixedly connected with the conveying belt, extend towards the space between the first guide rail and the second guide rail at the other ends of the conveying belt and are used for pushing each bottle blank to move.

Preferably: the control module comprises a driving shaft, a driving shaft sleeve and a fourth air cylinder, wherein the driving shaft is rotatably connected to one side of the arc-shaped portion, the driving shaft sleeve is sleeved on the driving shaft and can axially rotate, and the fourth air cylinder is used for controlling the driving shaft sleeve to lift.

In addition, the invention also discloses a bottle blowing method of the polypropylene bottle, which utilizes the bottle blowing system and is characterized by comprising the following steps:

(1) preparing and cleaning bottle blanks;

(2) placing the bottle blanks on each pair of guide rails, pushing each bottle blank to move on the moving part by using the moving rod until reaching the arc-shaped part, and guiding the bottle blanks into the bottle blowing cavity through the arc-shaped part;

(3) driving the third cylinder to enable the mold body to be attached, simultaneously rotating the horizontal rotating shaft until the forming mold is positioned at the topmost part and corresponds to the first mounting plate, and enabling bottle blanks in each bottle blowing cavity to correspond to each first air outlet nozzle;

(4) the first cylinder is used for driving the first mounting plate to descend, the first air outlet nozzles are inserted into the bottle blank from the bottle opening of the bottle blank, and meanwhile, the main control part controls the main pump, the auxiliary pump and the first air supply system to supply air to the first air outlet nozzles until the primary molding of the bottle blank is completed;

(5) rotating the horizontal rotating shaft again to enable the die body in the step (3) to be arranged on one side, simultaneously loosening the tightening rope to enable the cavity opening of the bottle blowing cavity to be upward, driving the second mounting plate to descend by using the second air cylinder to enable the second air outlet nozzle to be inserted into the bottle blank, and sequentially supplying air to the bottle blanks through the main pump, the auxiliary pump and the second type air supply system;

(6) and (5) after the step (5) is finished, rotating the horizontal rotating shaft to enable the die body in the step (5) to be positioned below the horizontal rotating shaft, tensioning the tightening rope, separating the die body through the second air cylinder, and finishing unloading.

Preferably: the step (4) and the step (5) can be performed synchronously, wherein the step (4) is performed when the first group of bottle blanks passes through the step (4) and enters the step (5), the step (4) is performed when the second group of bottle blanks, and the bottle blowing of the first group of bottle blanks in the step (5) and the bottle blowing of the second group of bottle blanks in the step (4) can be performed synchronously.

By adopting the technical scheme: utilize first type air feed system to carry out the air feed to first air blowing mouth to utilize first air blowing mouth to carry out preliminary extension shaping to the bottle embryo, and shift this group bottle embryo, and utilize second type air feed system to carry out the air feed to second air blowing mouth, finally, second air blowing mouth adjusts each bottle embryo one by one, and then guarantees the production quality of bottle embryo.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a bottle blowing module according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a first type of air supply module according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a second type of air supply module according to an embodiment of the present invention;

FIG. 5 is a functional block diagram of a central control unit according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a molding module according to an embodiment of the present invention;

FIG. 7 is a sectional view taken along line A-A of FIG. 6;

FIG. 8 is a cross-sectional view taken along line B-B of FIG. 7;

FIG. 9 is an expanded view of a forming die in accordance with an embodiment of the present invention;

fig. 10 is a schematic view of a guide rail structure according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-10, the present invention discloses a bottle blowing system for polypropylene bottles, which includes, in a specific embodiment of the present invention, a molding module 1 having at least two bottle blowing cavities 10 for accommodating bottle blanks, a bottle blowing module 2 for cooperating with the molding module 1 and for inflating the bottle blanks, a guiding module 3 for suspending the bottle blanks and guiding the bottle blanks into the bottle blowing cavities 10, a driving module 4 for driving the bottle blanks on the guiding module 3 to move, and a control module 5 for controlling the discharging of the output end of the guiding module 3; the bottle blowing module 2 comprises a first mounting plate 21 and a second mounting plate 22 which are arranged at intervals, a first air cylinder 23 and a second air cylinder 24 which are respectively used for driving the first mounting plate 21 and the second mounting plate 22 to ascend and descend, a plurality of first air outlet nozzles 25 and a plurality of second air outlet nozzles 26 which are respectively arranged on the first mounting plate 21 and the second mounting plate 22, and an air supply device 27 which is used for supplying air to the first air outlet nozzles 25 and the second air outlet nozzles 26; the air supply device 27 includes a first type air supply system 271 for supplying air to each first air outlet nozzle 25 and a second type air supply system 272 for supplying air to each second air outlet nozzle 26.

In the specific embodiment of the present invention, each of the first type air supply system 271 and the second type air supply system 272 includes an air source device 27a for supplying air and having an input end and an output end, and the first type air supply system 271 and the second type air supply system 272 respectively include a first type air supply module 271a and a second type air supply module 272a communicated with the output end of the air source device 27 a; the first type air supply module 271a comprises a main pipeline 2710a communicated with the output end of the air source device 27a, the output end of the main pipeline 2710a forms a node 2711a, and a plurality of branch pipelines 2712a for supplying air to the first air outlet nozzles 25 are respectively connected in series at the node 2711 a; the second type air supply module 272a comprises a control valve 2721a which is communicated with the output end of the air source device 27a through a first pipeline 2720a and has an input end and a plurality of output ends, and a plurality of second pipelines 2722a which are communicated with the output ends of the control valve 2721a and are used for supplying air to a second air outlet nozzle 26; and a central control unit for generating electric signals to the control valve 2721a and the air source device 27a to switch the operation state.

In a specific embodiment of the present invention, the first air outlet nozzles 25 and the second air outlet nozzles 26 are respectively divided into a plurality of groups, the air supply device 27a includes a main pump 27b and a plurality of sub-pumps 27c for respectively supplying air to each group of the first air outlet nozzles 25 or each group of the second air outlet nozzles 26, each main pump 27b is driven by a main motor 27d, each sub-pump 27c is driven by a sub-motor 27e, and the central control unit includes a main control portion 60, and a first controller 61, a second controller 62 and a third controller 63 which are controlled by the main control portion 60 and respectively used for controlling the main motor 27d, the sub-motor 27e and the control valve 2721 a; the communication interface between the first controller 61 for controlling the main motor 27d and the second controller 62 for controlling the auxiliary motor 27e is electrically connected to form a connection mode, in the connection mode, the control panel of the main control portion 60 selects the air intake amount of the main pump 27b, drives the first controller 61 to control the main motor 27d to operate according to the selected air intake amount, and simultaneously sends an electric signal to the second controller 62, and the second controller 62 controls the auxiliary motor 27e to operate according to the selected air intake amount based on the signal, and simultaneously controls the main pump 27b and the auxiliary pump to supply air to the main pipe 2710a or the first pipe 2720 a.

In the embodiment of the present invention, the forming module 1 includes a horizontal rotating shaft 11 driven by a first motor, a plurality of forming portions 12 circumferentially and equidistantly installed on a circumferential side wall of the horizontal rotating shaft 11, and a plurality of tightening portions 13 installed on the horizontal rotating shaft 11 and corresponding to the forming portions 12 one by one; the forming part 12 comprises support plates 120 arranged on the horizontal rotating shaft 11 at intervals, a frame 122 rotatably connected between the support plates 120 through a rotating shaft 121 and provided with an accommodating space 122a, a plurality of third cylinders 123 hinged to the inner walls of the two sides of the accommodating space 122a, and forming dies 124 fixedly connected with the output ends of the third cylinders 123 and hinged to each other; each forming mold 124 includes a mold body 124a fixedly connected to the output end of the third cylinder 123, and a half cavity 124b disposed on the mating surface of each mold body 124a and capable of being combined into the bottle blowing cavity 10, and each mold body 124a is further provided with a hinge shaft 124c and a shaft sleeve 124d which are mutually matched.

In an embodiment of the present invention, the accommodating space 122a is provided with a base 9 and an installation shaft 9a rotatably connected to the base 9 and used for installing the third cylinder 123.

In the specific embodiment of the present invention, the guiding module 3 includes a plurality of pairs of guide rails 30, each pair of guide rails 30 is composed of a first guide rail 31 and a second guide rail 32 which are arranged at intervals, and each of the first guide rail 31 and the second guide rail 32 includes a moving portion 3a which extends horizontally, a rotating hole 3b which is arranged at an output end of the moving portion 3a, and an arc portion 3d which is rotatably connected with the rotating hole 3b through a rotating shaft 3c and extends toward the mouth of the bottle blowing cavity 10.

In the embodiment of the present invention, the frame 122 is fixed with a hanging ring 80; the tightening part 13 includes a second motor 13a mounted on the horizontal rotary shaft 11 and corresponding to each frame 122, a winding wheel 13b mounted on an output end of the second motor 13a, and a tightening rope 13c wound on the winding wheel 13b and having one end connected to the suspension loop 80.

In the embodiment of the present invention, the driving module 4 includes a conveyor 40 disposed above each pair of guide rails 30 and driven by a third motor, and a plurality of moving rods 41 fixedly connected to the conveyor 40 and having another end extending between the first guide rail 31 and the second guide rail 32 for pushing each bottle blank to move.

In an embodiment of the present invention, the control module 5 includes a driving shaft 51 disposed on one side of the arc portion 3d and rotatably connected to the driving shaft, a driving shaft sleeve 52 sleeved on the driving shaft 51 and capable of axially rotating, and a fourth air cylinder 53 for controlling the driving shaft sleeve 52 to move up and down.

(1) preparing and cleaning bottle blanks;

By adopting the technical scheme: the first air supply system is used for supplying air to the first air blowing nozzle, the first air blowing nozzle is used for carrying out preliminary expansion molding on the bottle blanks, the group of bottle blanks is transferred, the second air supply system is used for supplying air to the second air blowing nozzle, and finally the second air blowing nozzle is used for adjusting the bottle blanks one by one so as to ensure the production quality of the bottle blanks;

in more detail:

referring to fig. 1-10, the principle of the present embodiment is:

referring to fig. 1 and 10, the prepared bottle blanks can be placed between the first guide rail and the second guide rail, the conveyer belt is driven to move by using a third motor, and the moving rod on the conveyer belt pushes the bottle blanks on the first guide rail and the second guide rail to move towards the forming module and guide the bottle blanks into each bottle blowing cavity by using the arc-shaped part, so that the bottle blank moving step is completed;

referring to fig. 6-9, in the process of guiding the bottle preform from the arc portion to the bottle blowing cavity, each third cylinder contracts respectively to slightly separate the mold bodies (i.e., the half-cavity mouth provided on each mold body is only used for the body of the bottle preform to enter, and the size of the mouth portion of the bottle preform is larger than that of the body of the bottle preform, so that the bottle preform is clamped on the bottle blowing cavity), when the position of the bottle preform is adjusted, the third cylinders drive the mold bodies to be combined to fix the bottle preforms, and finally, the group of mold bodies is moved to above the horizontal rotating shaft through the rotation of the horizontal rotating shaft, so that the fixing work of the bottle preform is completed;

referring to fig. 2-4, after the mold body is moved, the second motor drives the reel to wind, so that the tightening rope is wound, the bottle blowing cavity arranged on the mold body is upward, the first mounting plate is driven to descend by the second cylinder, so that the first air outlet nozzle on the first mounting plate is aligned with the bottle mouth of each bottle blank and is inserted into the bottle blank, at this time, the air supply devices (i.e., the main pump and the auxiliary pump) start to work, and supply air to the first air outlet nozzle through the main pipeline and the branch pipeline, so that the bottle blank is expanded, the primary forming is completed, after the primary forming is completed, the first mounting plate is described above, the horizontal rotating shaft continues to rotate, so that the mold body is positioned at the right side of the horizontal rotating shaft, at this time, the second mounting plate descends, so that the second air outlet nozzle on the second mounting plate is inserted into each bottle blank, and each bottle blank is inflated one by, finishing secondary forming (at the moment, the tightening part drives the tightening rope to loosen, the die body drives the mouth of the bottle blowing cavity to be upward due to the self weight), finally, rotating the horizontal rotating shaft, enabling the die body to reach the lower part of the die body, completely separating the die body, then tightening the tightening rope through the tightening part, enabling the mouth of the bottle blowing cavity to be downward, further finishing blanking, and finishing the bottle blowing of one wheel;

it should be noted that:

one of them, this embodiment utilizes first kind air feed module at first bottle blowing, and it carries out the air feed through trunk line and auxiliary line, and the auxiliary line that the trunk line output is established ties can admit air simultaneously for each bottle embryo can accomplish preliminary shaping in step, moreover, if carry out the air feed through single pump, when having the air feed, the defect that atmospheric pressure is not enough has consequently set up a plurality of auxiliary pumps and is used for supplementarily, promptly: the main pump and the auxiliary pump are respectively responsible for blowing air to each group of bottle blanks, so that the primary forming effect of each bottle blank can be ensured;

the second is setting of the connection mode between the driving motors of the main pump and the auxiliary pump, and aims to: guarantee that main pump and auxiliary pump are synchronous and carry out work simultaneously, promptly: the air supply quantity of the main pump and the auxiliary pump is ensured in the same time, so that the forming effect of each bottle blank is ensured to be the same, and the quality of the bottle blowing is ensured;

thirdly, after the first air supply module supplies air to the bottle blank, the second air supply module supplies air to the bottle blank which is formed for the first time, and the purpose is as follows: the molding quality is further ensured through secondary bottle blowing, and meanwhile, the second type air supply module is different from the first type air supply module in that: the air supply module of the second type is mainly used for adjusting the insufficient bottle blowing of each bottle blank, so that the air supply is not needed comprehensively, the air supply module can be used for performing one-way air supply of different lines through the control valve, and adjusting each bottle blank one by one, thereby further improving the bottle blowing quality of the bottle blanks;

thirdly, the tightening part can assist the forming module to perform blanking, so that the production efficiency of the embodiment is ensured;

fourthly, the control module can control the blanking of the guide rail, namely: the fourth cylinder is used for driving the arc-shaped part to swing by taking the rotary hole as a base point, so that the blanking of bottle blanks can be controlled, and the arc-shaped part can be matched with the horizontal rotary shaft to realize accurate feeding;

fifthly, the third cylinder is hinged with the cavity wall of the accommodating space, so that the stability of driving each die body can be guaranteed, and the operation stability of the embodiment is guaranteed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A bottle blowing system of polypropylene bottles is characterized in that: the automatic bottle blowing device comprises a molding module at least provided with two bottle blowing cavities for accommodating bottle blanks, a bottle blowing module, a guide module, a driving module and a control module, wherein the bottle blowing module is used for being matched with the molding module and inflating the bottle blanks; the bottle blowing module comprises a first mounting plate and a second mounting plate which are arranged at intervals, a first air cylinder and a second air cylinder which are respectively used for driving the first mounting plate and the second mounting plate to lift, a plurality of first air outlet nozzles and a plurality of second air outlet nozzles which are respectively arranged on the first mounting plate and the second mounting plate, and an air supply device used for supplying air to the first air outlet nozzles and the second air outlet nozzles; the air supply device comprises a first air supply system for supplying air to the first air outlet nozzles and a second air supply system for supplying air to the second air outlet nozzles.

2. The system for blowing a polypropylene bottle according to claim 1, wherein: the first type air supply system and the second type air supply system respectively comprise an air source device which is used for supplying air and is provided with an input end and an output end, and the first type air supply system and the second type air supply system respectively comprise a first type air supply module and a second type air supply module which are communicated with the output end of the air source device; the first type air supply module comprises a main pipeline communicated with the output end of the air source device, the output end of the main pipeline forms a node, and a plurality of branch pipelines for supplying air to the first air outlet nozzles are respectively connected in series at the node; the second type air supply module comprises a control valve which is communicated with the output end of the air source device through a first pipeline and is provided with an input end and a plurality of output ends, and a plurality of second pipelines which are communicated with the output ends of the control valve and are used for supplying air to a second air outlet nozzle; the control device also comprises a central control unit which generates electric signals to the control valve and the air source device so as to switch the working state.

3. The system for blowing a polypropylene bottle according to claim 2, wherein: the air source device comprises a main pump and a plurality of auxiliary pumps, wherein the main pump supplies air to each group of first air outlet nozzles or each group of second air outlet nozzles respectively; the main control system comprises a main control part, a main pipeline and a secondary motor, wherein a communication interface between a first controller used for controlling the main motor and a second controller used for controlling the secondary motor is electrically connected to form a connection mode, the air inflow of the main pump is selected on a control panel of the main control part, the first controller is driven to control the main motor to work according to the selected air inflow, an electric signal is sent to the second controller, the second controller controls the secondary motor to operate according to the selected air inflow based on the signal, and the main pump and the secondary pump are controlled to supply air to the main pipeline or the first pipeline.

4. A bottle blowing system for polypropylene bottles according to any one of claims 1 to 3, characterized in that: the forming module comprises a horizontal rotating shaft driven by a first motor, a plurality of forming parts which are circumferentially and equidistantly arranged on the circumferential side wall of the horizontal rotating shaft at intervals, and a plurality of tightening parts which are arranged on the horizontal rotating shaft and correspond to the forming parts one by one; the forming part comprises support plates which are arranged on the horizontal rotating shaft at intervals, a frame which is connected between the support plates through a rotating shaft in a rotating mode and is provided with an accommodating space, a plurality of third air cylinders which are hinged to the inner walls of two sides of the accommodating space, and forming dies which are fixedly connected with the output ends of the third air cylinders respectively and are hinged to each other; each forming die comprises a die body fixedly connected with the output end of the third cylinder and a semi-cavity arranged on the matching surface of each die body and capable of being combined into a bottle blowing cavity, and each die body is also provided with a hinge shaft and a shaft sleeve which are matched with each other.

5. The system for blowing a polypropylene bottle according to claim 4, wherein: the guide module comprises a plurality of pairs of guide rails, each pair of guide rails consists of a first guide rail and a second guide rail which are arranged at intervals, and each of the first guide rail and the second guide rail comprises a moving part extending horizontally, a rotating hole arranged at the output end of the moving part and an arc-shaped part which is rotatably connected with the rotating hole through a rotating shaft and extends towards the orifice of the bottle blowing cavity.

6. The bottle blowing system for polypropylene bottles of claim 5, wherein: a hanging ring is fixed on the frame; the tightening part comprises second motors which are arranged on the horizontal rotating shaft and correspond to the frames one by one, reels which are arranged at the output ends of the second motors, and tightening ropes which are wound on the reels and one ends of which are connected with the hanging rings.

7. The bottle blowing system for polypropylene bottles of claim 5 or 6, wherein: the driving module comprises a conveying belt which is arranged above each pair of guide rails and is driven by a third motor and a plurality of moving rods which are fixedly connected with the conveying belt, extend towards the space between the first guide rail and the second guide rail at the other ends of the conveying belt and are used for pushing each bottle blank to move.

8. The system of claim 7, wherein: the control module comprises a driving shaft, a driving shaft sleeve and a fourth air cylinder, wherein the driving shaft is rotatably connected to one side of the arc-shaped portion, the driving shaft sleeve is sleeved on the driving shaft and can axially rotate, and the fourth air cylinder is used for controlling the driving shaft sleeve to lift.

9. A method for blowing polypropylene bottles by using the bottle blowing system of claim 1, which comprises the following steps:

(1) preparing and cleaning bottle blanks;

10. The method for blowing a polypropylene bottle according to claim 9, wherein: the step (4) and the step (5) can be performed synchronously, wherein the step (4) is performed when the first group of bottle blanks passes through the step (4) and enters the step (5), the step (4) is performed when the second group of bottle blanks, and the bottle blowing of the first group of bottle blanks in the step (5) and the bottle blowing of the second group of bottle blanks in the step (4) can be performed synchronously.