A liquid blow molding machine using a one-step method

Abstract

The present invention relates to a liquid blow molding machine using a one-step process. Existing liquid blow molding machines have the problem that the preforms are torn when being blown into bottles due to uneven local heating. The present invention includes a frame, on which an injection molding mechanism, a bottle blowing mechanism and a conveying mechanism are provided. The conveying mechanism includes a core assembly and an infusion assembly. The core assembly transfers the processed and formed preforms to the bottle blowing cavity. The infusion assembly recovers the liquid used to cool and shape the preforms in the injection molding mechanism and is used to blow the bottles in the bottle blowing mechanism, so as to preheat the liquid and reduce the temperature difference between the liquid and the preforms. The infusion assembly first cools the preforms in the injection molding mechanism to preheat the liquid, and then uses the heated liquid to infuse and blow the preforms in the bottle blowing mechanism, which not only ensures that each area of ​​the preform can be evenly stretched and expanded, but also cools and shapes the preforms in the injection molding cavity, thereby improving the user experience.

Description

Technical Field

[0001] The invention relates to the field of plastic processing, in particular to a liquid blow molding machine. Background Art

[0002] Existing liquid blow molding machines consist of a frame, a blowing mechanism, and a liquid infusion mechanism mounted on the frame. The blowing mechanism houses a blowing chamber. During use, a preform is heated, softened, and inserted into the blowing chamber. The liquid infusion mechanism then pumps high-pressure liquid into the preform, causing it to expand and be blown into a bottle. During the blow molding process, due to the large temperature difference between the liquid and the preform, the preform can cool and harden in some areas before it comes into contact with the liquid. This prevents the preform from being uniformly blown into shape, leading to uneven bottle thickness and localized tearing. This increases scrap rates and compromises user experience. Furthermore, existing liquid injection molding machines all utilize a two-step process, requiring the preform to be prepared in advance, which increases the processing time. Summary of the Invention

[0003] In order to address the shortcomings of the existing technology, the present invention provides a liquid blow molding machine using a one-step method, which uses a one-step method to process and form the bottle body, and utilizes the cooling operation during injection molding to preheat the liquid, thereby improving the success rate of bottle blowing, and can also cool and shape the bottle blank formed by injection molding, thereby improving the user experience.

[0004] The present invention is achieved in the following manner: a liquid blow molding machine using a one-step method includes a frame, the frame is provided with an injection molding mechanism with an injection molding cavity, a bottle blowing mechanism with a bottle blowing cavity, and a conveying mechanism that can reciprocate between the injection molding cavity and the bottle blowing cavity, the conveying mechanism includes a core assembly and an infusion assembly corresponding to the core assembly, the core assembly inserted in the injection molding cavity transfers the processed bottle blank to the bottle blowing cavity, the infusion assembly recovers the liquid used to cool and shape the bottle blank in the injection molding mechanism and is used to blow the bottle body in the bottle blowing mechanism, so that the liquid is preheated and the temperature difference between the liquid and the bottle blank is reduced. An injection molding mechanism and a conveying mechanism are arranged on the frame to form a one-step bottle preform processing device. The infusion component first cools the bottle preform in the injection molding mechanism to preheat the liquid, and then uses the heated liquid to infuse and blow the bottle preform in the blowing mechanism. By reducing the temperature difference between the bottle preform and the liquid, the temperature difference between different areas of the bottle preform is reduced, ensuring that each area of ​​the bottle preform can be stretched and expanded evenly, preventing the bottle preform from being torn due to stress caused by local cold hardening, ensuring the quality of the bottle body, and effectively reducing the scrap rate. The bottle preform in the injection cavity is also cooled and shaped to prevent the bottle preform from deformation when being transferred to the blowing cavity, thereby improving the user experience.

[0005] Preferably, the liquid infusion assembly comprises a liquid reservoir, a low-pressure portion for cooling and shaping the preform via a core assembly inserted into the injection cavity, and a high-pressure portion for blowing the preform into a bottle body via the core assembly inserted into the blowing cavity. Liquid in the liquid reservoir is drawn from the low-pressure portion and preheated by flowing through the core assembly through the injection mechanism. The high-pressure portion receives liquid from the low-pressure portion and delivers it to the preform within the blowing cavity through the core assembly, thereby blowing the preform into a bottle body. The liquid reservoir stores liquid for cooling and blowing the preform. When the core assembly cooperates with the injection cavity to form the preform, the low-pressure portion draws liquid from the reservoir and cools and shapes the preform by flowing through the core assembly, thereby preheating the liquid. The core assembly cooperates with the blowing cavity to blow the preform, and the high-pressure portion injects the preheated liquid into the preform, thereby blowing the preform into a bottle body, effectively utilizing the liquid.

[0006] Preferably, the frame is provided with a sealing mechanism corresponding to the bottle blowing mechanism, and the sealing mechanism seals the bottle body blown into shape by the liquid, so that the liquid is sealed and retained in the bottle body to form the final product. The liquid used for cooling and bottle blowing is the final product that needs to be filled later, so that the liquid is directly retained in the bottle body after the bottle body is blown and sealed by the sealing mechanism. There is no need to pour the liquid into the blown bottle body before filling, which improves processing efficiency by simplifying the processing steps, and ensures that the bottle preform, the blown bottle body and the filled final product are all in a sterile state, eliminating the need for disinfection and sterilization of the bottle body due to transfer filling, effectively reducing the number of processing links, improving processing efficiency, reducing equipment costs, and facilitating maintenance.

[0007] Preferably, a waste liquid collection tank is provided below the bottle blowing mechanism. Liquid leaking from the bottle blowing chamber is collected in the waste liquid collection tank and returned to the liquid storage tank for reuse. This effectively improves liquid utilization efficiency and prevents outward leakage, which could affect the surrounding hygiene of the workstation. The waste liquid collection tank and the pipelines supplying the liquid to the liquid storage tank are sterile, ensuring that any leaked liquid can be reused in the final product.

[0008] Preferably, the frame is provided with a pre-fill assembly corresponding to the bottle blowing mechanism. The pre-fill assembly delivers gas to the bottle body within the blowing chamber via the core assembly, thereby expanding the preform and separating it from the outer wall of the core assembly. When the core assembly, carrying the preform, is transported into the blowing chamber, the pre-fill assembly injects an appropriate amount of air into the preform to drive the preform to expand appropriately, separating the inner wall of the preform from the outer wall of the core assembly. This facilitates the application of balanced pressure to all areas of the inner wall of the preform during liquid injection, ensuring that the preform is evenly blown and expanded into a bottle body, preventing localized pressure and tearing between the preform and the core assembly due to poor liquid flow, and ensuring successful blowing.

[0009] Preferably, there are two blowing mechanisms, positioned on either side of the injection molding mechanism. The conveying mechanism includes two sets of core assemblies, one corresponding to each of the blowing mechanisms, so that the core assemblies alternately obtain preforms from the injection molding mechanism and transfer them to the corresponding blowing mechanism. A blowing mechanism is positioned on either side of the injection molding mechanism, and each blowing mechanism includes a core assembly that obtains preforms from the injection molding mechanism. This ensures that the two blowing assemblies, through their corresponding core assemblies, can alternately process preforms in the injection molding mechanism and then blow them after they are transferred back. This effectively improves the production efficiency of the injection molding mechanism and prevents the injection molding mechanism from being forced to wait due to the long processing time of the blowing mechanism, thereby improving production efficiency.

[0010] Preferably, the core assembly comprises a movable platform that can reciprocate between the injection molding mechanism and the bottle blowing mechanism, and a core body disposed on the movable platform, the core body comprising a sleeve and a core tube inserted within the sleeve, a head being provided at the bottom of the core tube, an internal channel having a cooling port at the bottom formed within the core tube, an external channel being provided between the core tube and the sleeve, the internal channel and the external channel being connected via the cooling port, and the core tube being vertically raised and lowered so that the core assembly can switch between an injection state in which the head seals the lower end of the external channel and a bottle blowing state in which the head stretches the preform downward and the external channel is connected to the inner cavity of the preform. The movable platform is used to drive the core body to perform overall lifting and translation so that the core body can reciprocate between the injection cavity and the bottle blowing cavity, thereby ensuring that the core body can reciprocate and translate between the injection molding mechanism and the bottle blowing mechanism to achieve bottle preform transfer, and also enabling the core body to be inserted and removed from the injection cavity and the bottle blowing cavity by vertical lifting and pulling to achieve the operation of injecting the preform and blowing the bottle body. The core tube can be lifted and lowered into the sleeve, allowing the seal at the bottom of the core tube to seal the lower end of the sleeve. When the seal seals the lower end of the sleeve, the core body can cooperate with the injection cavity to inject the preform. The internal and external channels are connected, facilitating liquid flow and cooling and shaping the preform while preventing liquid from contacting the preform. When the seal moves downward under the drive of the core tube, it moves downward and stretches the preform, connecting the lower end of the sleeve with the inner cavity of the preform, facilitating liquid infusion and blowing the preform, effectively improving the quality of the blown bottle.

[0011] Preferably, the infusion assembly includes a buffer chamber, which recovers the liquid fed into the injection molding mechanism by the low-pressure portion, which is then extracted by the high-pressure portion and used to blow the bottle. The buffer chamber serves as a temporary storage for liquid, temporarily storing the liquid used to cool and shape the preform. This serves as a medium for blowing the bottle when the preform is transferred to the blowing chamber. This not only effectively collects the liquid, ensuring the liquid volume meets the requirements for blowing the bottle, but also insulates the liquid, minimizing the temperature difference between the liquid and the preform by reducing heat loss, effectively improving the success rate of blowing.

[0012] Preferably, the low-pressure unit includes a low-pressure water pump, the inlet of which is connected to the liquid storage tank, and the outlet of which is connected to the internal channel via a pipe with a control valve. The driving force generated by the low-pressure water pump satisfies the requirements for liquid flow through the internal and external channels, preheating the liquid while effectively reducing equipment costs and improving reliability. A control valve is provided to control the on-off relationship of the pipeline, facilitating the flow of liquid along a predetermined path.

[0013] Preferably, the upper end of the external channel is connected to the buffer chamber via a conduit with a control valve, allowing liquid in the internal channel to flow through the external channel for preheating and collection in the buffer chamber. Liquid, pumped by a low-pressure water pump, flows from top to bottom through the internal channel, then from bottom to top through the external channel, where it is collected by the buffer chamber. This increases the liquid's flow distance within the core, enhancing the cooling effect on the preform and ensuring uniform temperature across all areas of the preform. This not only facilitates subsequent blowing, but also prevents the preform from retaining its pre-set shape during transport, and utilizes the residual heat of the preform to ensure sterility during transport.

[0014] Preferably, a liquid replenishment pipe with a control valve is provided between the buffer chamber and the liquid storage tank, through which the buffer chamber receives liquid from the liquid storage tank. The liquid replenishment pipe allows for replenishment of liquid when the liquid in the buffer chamber fails to meet the requirements for bottle blowing, thereby ensuring that the preform can be blown into a bottle.

[0015] Preferably, a first piston and a first spring are disposed at the top of the core tube. The first piston receives liquid from the high-pressure section and, through the core tube, forces the end cap to stretch the preform downward, exposing the lower end of the external channel and forming a downward inlet for injecting liquid into the preform. The first spring is pushed and contracted by the core tube, accumulating a preload force that forces the core tube to return upward. The core tube, driven downward by the first piston during bottle blowing, engages the end cap with the bottom of the preform, stretching the preform and facilitating radial expansion to closely conform to the inner wall of the blowing chamber, ensuring that the preform is blown into a bottle with a predetermined contour. The first piston is powered by liquid from the high-pressure section, allowing it to stretch the preform as the high-pressure section injects liquid into the preform, ensuring efficient blowing. The first spring accumulates a return preload force as the core tube moves downward. Upon completion of bottle blowing, the spring pulls the core tube upward, allowing the core tube to contract and move to the injection molding mechanism to engage the injection chamber for processing the preform.

[0016] Preferably, the sleeve has an upper water inlet in the middle section, and the core assembly includes a sealing sleeve that is positioned within the sleeve and seals the upper water inlet. A second piston and a second spring are positioned at the top of the sleeve. The second piston receives liquid from the high-pressure unit and forces the sleeve downward, exposing the upper water inlet through the sealing sleeve and communicating with the inner cavity of the preform. The second spring is compressed and extended by the sleeve, accumulating a preload force that forces the sleeve upward. The sleeve can be driven downward by the second piston when the high-pressure unit injects liquid into the preform, causing the upper water inlet, hidden within the sealing sleeve, to move downward and communicate with the inner cavity of the preform, facilitating liquid injection into the top of the preform and ensuring uniform blowing of the preform into a bottle body. The second piston is driven by liquid output from the high-pressure unit, allowing the second piston to expose the upper water inlet when the high-pressure unit injects liquid into the preform, ensuring efficient blowing of the preform. The second spring can accumulate a restoring preload when the sleeve moves downward, and pull the sleeve upward to reset when the bottle body is blown, so that the upper water inlet is hidden in the sealing sleeve, preventing the external channel from communicating with the inner cavity of the bottle preform when the bottle preform is cooled, thereby ensuring the quality of the bottle preform processing.

[0017] Preferably, the high-pressure unit comprises a high-pressure water pump and an accumulator connected in series. The inlet of the high-pressure water pump communicates with the buffer chamber, and the outlet of the accumulator communicates with the upper end of the external channel. When the core assembly is inserted into the blowing chamber and switched to the blowing mode, the accumulator delivers liquid through the external channel to the inner cavity of the preform, thereby blowing the preform into a bottle body. The high-pressure water pump can inject liquid from the buffer chamber into the accumulator, so that after receiving a preset volume of liquid, the accumulator concentrates the liquid outward during the blowing of the preform in the blowing chamber. The accumulator outlet can both deliver a large portion of the liquid to the external channel, driving the preform to expand into the bottle body within the blowing chamber, and deliver liquid to the first and second pistons, driving the core tube and sleeve along a preset path to cooperate with the blowing operation.

[0018] Preferably, the volume of liquid in the accumulator is greater than the volume of the bottle body. The liquid in the accumulator fills the bottle body and falls back to a predetermined liquid level when the core assembly is removed. A single injection of liquid into the accumulator satisfies the bottle blowing requirements, ensuring that the bottle body is completely filled with liquid. This not only ensures that all areas of the bottle body are evenly stressed and deformed, resulting in a bottle body with uniform wall thickness, but also ensures that the final product that meets the filling requirements remains in the bottle body, thereby improving filling efficiency.

[0019] Preferably, the accumulator outlet is connected to the external channel via a compensating tube with a solenoid valve. The compensating tube is located above the external channel, and the length of the compensating tube section between the solenoid valve and the external channel is adjusted to compensate for the liquid in the bottle. When the core assembly is removed from the bottle, the liquid remaining in the compensating tube flows into the bottle through the external channel, thereby ensuring that the liquid level in the bottle meets the filling requirements.

[0020] Preferably, the core assembly includes an injection core that is vertically insertable and removable at the injection molding mechanism, a blowing core that is vertically insertable and removable at the blowing mechanism, and a half clamp that is reciprocally movable between the injection molding mechanism and the blowing mechanism. Liquid in the liquid storage tank is drawn by the low-pressure portion and preheated as it flows through the injection core and into the injection molding mechanism. The half clamp grasps the preform in the injection cavity and transfers it to the blowing cavity. The high-pressure portion receives liquid from the injection core and transfers it into the preform in the blowing cavity through the blowing core, so that the preform is blown into a bottle body. The preform is transferred from the injection cavity to the blowing cavity via the half clamp. The infusion assembly obtains the preheated liquid through the injection core and then transfers the liquid into the preform through the blowing core, so that the preform is blown into a bottle body.

[0021] The outstanding beneficial effects of the present invention are: by arranging an injection molding mechanism and a conveying mechanism on the frame to form a one-step bottle preform processing equipment, the infusion component first cools the bottle preform in the injection molding mechanism to preheat the liquid, and then uses the heated liquid to infuse and blow the bottle preform in the blowing mechanism, which reduces the temperature difference between the bottle preform and the liquid to reduce the temperature difference between different areas of the bottle preform, ensures that each area of ​​the bottle preform can be stretched and expanded evenly, prevents the bottle preform from being torn due to stress caused by local cold hardening, ensures the quality of the bottle body, effectively reduces the scrap rate, and cools and shapes the bottle preform in the injection molding cavity to prevent the bottle preform from being deformed when being transferred to the blowing cavity, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic cross-sectional view of the liquid blow molding machine described in Example 1;

[0023] Figure 2 This is a schematic structural diagram of the conveying mechanism of the liquid blow molding machine described in Example 1;

[0024] Figure 3 This is a schematic cross-sectional view of the core during injection molding according to Example 1;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the core body described in Example 1 during bottle blowing;

[0026] Figure 5 This is a schematic diagram of a partial cross-sectional structure of the core body described in Example 1;

[0027] In the figure: 1. frame, 2. injection molding mechanism, 3. bottle blowing mechanism, 4. core assembly, 5. infusion assembly, 6. liquid storage tank, 7. low-pressure water pump, 8. movable table, 9. core tube, 10. head, 11. internal channel, 12. external channel, 13. buffer chamber, 14. fluid replenishment pipeline, 15. first piston, 16. second piston, 17. upper water injection port, 18. sealing sleeve, 19. casing, 20. high-pressure water pump, 21. accumulator, 22. compensation pipe, 23. lower water injection port. DETAILED DESCRIPTION

[0028] The essential features of the present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0029] Example 1:

[0030] This embodiment provides a liquid blow molding machine.

[0031] like Figure 1 and 2 The liquid blow molding machine shown is composed of a frame 1, on which are provided an injection molding mechanism 2 with an injection cavity, a bottle blowing mechanism 3 with a bottle blowing cavity, and a conveying mechanism that can move back and forth between the injection molding cavity and the bottle blowing cavity. The conveying mechanism includes a core assembly 4 and an infusion assembly 5 corresponding to the core assembly 4. The core assembly 4 inserted in the injection cavity transfers the processed bottle blank to the bottle blowing cavity. The infusion assembly 5 recovers the liquid used to cool and shape the bottle blank in the injection molding mechanism 2 and is used to blow the bottle body in the bottle blowing mechanism 3, so that the liquid is preheated and the temperature difference between the liquid and the bottle blank is reduced.

[0032] By adding an injection molding mechanism 2 and a conveying mechanism to the frame 1, the original equipment is improved to a one-step liquid blow molding machine, so that the equipment can first form a bottle blank through the injection molding process of the granular raw material, and then blow the bottle blank into a bottle body, effectively reducing the space occupied by the equipment and facilitating the supply of raw materials. During the production process, the injection molding mechanism 2 needs to cool the bottle blank after injection molding, and use the infusion component 5 to convey liquid to cool and shape the bottle blank. It can not only ensure that its contour remains constant by lowering the temperature of the bottle blank, which is convenient for subsequent transportation, but also preheat the liquid and increase the temperature difference between the liquid and the bottle blank to improve the success rate of blowing, prevent the bottle blank from being unable to expand and tear due to local excessive cold hardening, ensure that the thickness of each area of ​​the bottle body is uniform, improve the quality of bottle blowing to meet production requirements, effectively reduce the scrap rate, and thus improve the reliability of equipment use.

[0033] In this embodiment, the infusion assembly 5 includes a liquid reservoir 6, a buffer chamber 13, a low-pressure portion for cooling and shaping the preforms via the core assembly 4 inserted into the injection cavity, and a high-pressure portion for blowing the preforms into bottles via the core assembly 4 inserted into the blowing cavity. Liquid in the liquid reservoir 6 is drawn by the low-pressure portion and preheated as it flows through the core assembly 4 through the injection mechanism 2. The buffer chamber 13 recovers the liquid flowing through the injection mechanism 2 and provides the liquid required for blowing the bottles to the high-pressure portion. The high-pressure portion receives the liquid from the buffer chamber 13 and delivers it to the preforms in the blowing cavity via the core assembly 4, thereby blowing the preforms into bottles. The liquid reservoir 6 stores a large amount of liquid, ensuring that the equipment receives sufficient liquid during operation and that the equipment can operate normally for a long time. The buffer chamber 13 is used to collect the liquid flowing through the injection molding mechanism 2 and concentrate it into the bottle blank through the high-pressure part. This ensures that the high-pressure part can quickly and concentratedly pour the compressed high-pressure liquid into the bottle blank located in the blowing cavity, ensuring that the bottle blank is instantaneously stressed and expanded into a bottle body with a preset contour. It can also play a role in heat preservation by concentrating the collection of preheated liquid.

[0034] In this embodiment, the core assembly 4 includes a movable platform 8 that can move back and forth between the injection molding mechanism 2 and the bottle blowing mechanism 3, and a core body arranged on the movable platform 8. The movable platform 8 is provided with a driving mechanism for driving the core body to rise and fall and translate, which not only ensures that the core body can be vertically plugged and pulled with the injection molding cavity and the bottle blowing cavity respectively, but also ensures that the bottle blank is translated from the injection molding mechanism 2 to the bottle blowing mechanism 3 under the drive of the core body, thereby completing the transfer of the bottle blank. In addition, the core body can cooperate with the injection molding cavity at the injection molding mechanism 2 to complete the injection molding operation of the bottle blank, and can also cooperate with the bottle blowing cavity at the bottle blowing mechanism 3 to complete the stretching and blowing operation of the bottle blank, so that the core body plays multiple functions such as cooperating with injection molding, transferring bottle blanks and cooperating with blowing.

[0035] In this embodiment, the core body includes a sleeve 19 and a core tube 9 inserted within the sleeve 19. The core tube 9 is provided with a head 10 at its bottom. An internal channel 11 with a cooling port at its bottom is formed within the core tube 9. An external channel 12 is provided between the core tube 9 and the sleeve 19. The internal channel 11 and the external channel 12 are connected by the cooling port. The core tube 9 is vertically raised and lowered so that the core assembly 4 can switch between an injection state in which the head 10 blocks the lower end of the external channel 12 and a blow molding state in which the head 10 stretches the preform downward and the external channel 12 communicates with the inner cavity of the preform. The core tube 9 can be raised and lowered within the sleeve 19, so that the head 10 can switch between a blocking position in which the lower end of the sleeve 19 is blocked and a stretching position in which the lower end of the sleeve 19 is exposed, thereby meeting the differentiated functional requirements of the core body within the injection molding mechanism 2 and the blow molding mechanism 3.

[0036] When in use, the liquid blow molding machine realizes processing operation through the following steps:

[0037] In the first step, the core is inserted into the injection cavity under the drive of the movable table 8 so that the spatial contour of the injection cavity matches the contour of the bottle blank. At the same time, the injection molding mechanism 2 heats and liquefies the granular raw material in preparation for injection molding;

[0038] In the second step, the injection molding mechanism 2 pours the liquefied raw material into the injection molding cavity, so that the raw material fills the injection molding cavity. During this process, the raw material will generate pressure on the wall of the injection molding cavity, so that the head 10 is tightly fitted with the lower end of the sleeve 19, ensuring that the internal channel 11 and the external channel 12 are sealed and connected (such as Figure 3 shown);

[0039] In the third step, the low-pressure water pump 7 draws the liquid from the liquid storage tank 6 and delivers it to the upper end of the internal channel 11. The liquid first flows from top to bottom along the internal channel 11, then passes through the cooling port and flows from bottom to top through the external channel 12, and finally remains in the buffer chamber 13 to cool and shape the preform. The preheated liquid accumulates in the buffer chamber 13.

[0040] In the fourth step, the core is moved from the injection cavity to the blowing cavity by the movable table 8, so that the preform is sealed in the blowing cavity. At the same time, the high-pressure water pump 20 extracts the liquid in the buffer cavity 13 and compresses it into the accumulator 21, so that the accumulator 21 stores the high-pressure liquid required for a single bottle blowing.

[0041] In the fifth step, the accumulator 21 delivers high-pressure liquid to the core body. Part of the liquid is input into the first piston 15, causing the core tube 9 to drive the head 10 to move downward and stretch the preform, thereby exposing the lower end of the sleeve 19 and forming a lower water injection port 23. Part of the liquid is input into the second piston 16, causing the sleeve 19 to move downward and ensure that the upper water injection port 17 is exposed to the sealing sleeve 18. The remaining liquid flows into the external channel 12 and is poured into the preform through the upper water injection port 17 and the lower water injection port 23, so that the top and bottom of the preform are evenly pressurized and evenly blown into a bottle (such as Figure 4 shown).

[0042] After the bottle is blown, the liquid is completely dumped out to form the bottle body. The liquid is collected for reuse. During injection molding, the raw material exerts pressure on the head 10, causing it to seal against the lower end of the sleeve 19. This prevents the raw material from entering the core and prevents the cooling liquid from coming into contact with the preform, ensuring that the injection-molded preform meets the requirements of use.

[0043] In this embodiment, a built-in channel 11 is formed inside the core tube 9 (such as Figure 5As shown in FIG5 ), an external channel 12 with a circular cross-section is formed between the outer wall of the core tube 9 and the inner wall of the sleeve 19. A cooling port is provided at the bottom of the core tube 9, so that the bottom of the internal channel 11 and the bottom of the external channel 12 are connected to each other, facilitating the flow of liquid from the internal channel 11 to the external channel 12. By extending the flow distance of the liquid in the core, the completely injected preform is evenly cooled, ensuring that the preform is properly hardened and does not deform during transportation. It also ensures that the preform can be directly blown into a bottle after being transported to the blowing chamber, effectively reducing intermediate steps, and ensuring that the inner cavity of the preform is sealed and inserted by the core during transportation to maintain a sterile state.

[0044] In this embodiment, the low-pressure part includes a low-pressure water pump 7, the inlet of the low-pressure water pump 7 is connected to the liquid storage tank 6, and the outlet of the low-pressure water pump 7 is connected to the built-in channel 11 through a pipe with a control valve. The pressure applied by the low-pressure water pump 7 to the liquid can meet the requirements of the liquid flowing through the core and converging into the buffer chamber 13, effectively reducing the requirements for equipment performance and improving the user experience. The control valve provided between the low-pressure water pump 7 and the built-in channel 11 plays the role of controlling the opening and closing of the corresponding pipeline, ensuring that the liquid can smoothly enter the built-in channel 11 under the drive of the low-pressure water pump 7, and can also prevent the high-pressure liquid in the built-in channel 11 from flowing back to the low-pressure water pump 7 when blowing the bottle, ensuring that the liquid can flow along the preset path.

[0045] In this embodiment, the upper end of the external channel 12 is connected to the buffer chamber 13 via a pipe with a control valve, allowing the liquid in the internal channel 11 to flow through the external channel 12, preheat and be collected in the buffer chamber 13. When the preform is cooled, the liquid in the external channel 12 flows into the buffer chamber 13 through the corresponding pipe, so that the preheated liquid can be collected in the buffer chamber 13, providing the high-pressure part with the liquid needed for blowing the bottle body. The control valve disposed between the upper end of the external channel 12 and the buffer chamber 13 controls the opening and closing of the corresponding pipe, ensuring that the liquid in the external channel 12 can flow smoothly into the buffer chamber 13 during injection cooling, and preventing the high-pressure liquid in the external channel 12 from flowing back into the buffer chamber 13 during bottle blowing, ensuring that the liquid can flow along the predetermined path.

[0046] In this embodiment, a refill pipe 14 with a control valve is provided between the buffer chamber 13 and the liquid storage tank 6. The buffer chamber 13 receives liquid from the liquid storage tank 6 through the refill pipe 14. A preset temperature range is set, and within this temperature range, the preform maintains a stable profile and is capable of expansion during blow molding. Specifically, the preform temperature is controlled by controlling the liquid flow through the core, ensuring that the preform temperature remains within the preset temperature range. This can result in the buffer chamber 13 being unable to meet blowing requirements due to insufficient liquid collection. The provision of the refill pipe 14 allows the liquid storage tank 6 to directly refill the buffer chamber 13 with liquid, ensuring that the liquid in the buffer chamber 13 meets the requirements for bottle blowing. Furthermore, by limiting the refill flow rate, the temperature drop of the liquid in the buffer chamber 13 is minimized, thereby ensuring the quality of bottle blowing.

[0047] In this embodiment, the high-pressure unit comprises a high-pressure water pump 20 and an accumulator 21 connected in series. The inlet of the high-pressure water pump 20 communicates with the buffer chamber 13, and the outlet of the accumulator 21 communicates with the upper end of the external channel 12. When the core assembly 4 is inserted into the blowing chamber and switched to the blowing mode, the accumulator 21 delivers liquid through the external channel 12 into the inner cavity of the preform, thereby blowing the preform into a bottle body. The accumulator 21 is equipped with an air bladder, which maintains a constant volume. Liquid is pumped into the accumulator 21 by the high-pressure water pump 20, compressing the air bladder and maintaining a high pressure within the accumulator 21. When the blowing operation is required, the compressed air bladder pushes the liquid to quickly fill the preform in the blowing chamber, thereby blowing the preform into a bottle body. Because the high-pressure water pump 20 can only slowly fill the accumulator 21 with liquid, the accumulator 21 functions as a reservoir of high-pressure liquid and delivers it to the preform in a short period of time.

[0048] In this embodiment, the liquid volume in the accumulator 21 is greater than the volume of the bottle body. The liquid in the accumulator 21 fills the bottle body and returns to a predetermined liquid level when the core assembly 4 is removed. The liquid capacity in the accumulator 21 can meet the needs of a single blow-molding of a bottle body and simultaneously drive the movement of the first piston 15 and the second piston 16, thereby ensuring that the preform is smoothly blown into a bottle body.

[0049] In this embodiment, a first piston 15 and a first spring are positioned at the top of the core tube 9. The first piston 15 receives liquid from the high-pressure section and, through the core tube 9, forces the end cap 10 downward to pull the preform downward, exposing the lower end of the external channel 12 and forming a lower water inlet 23 for injecting liquid into the preform. The first spring is pushed and contracted by the core tube 9, accumulating a preload that forces the core tube 9 upward. Both the first piston 15 and the first spring are positioned at the top of the core tube 9, effectively clear of the bottom of the core, ensuring smooth insertion into the injection or blow molding cavity. The first piston 15 is actuated by high-pressure liquid output from the accumulator 21. This eliminates the need for a drive source, simplifies the equipment structure, and ensures that the core tube 9's movement is synchronized with the blow molding process, ensuring accurate blow molding. The first piston 15 activates while the accumulator 21 delivers high-pressure liquid to the preform. After the blow molding process is complete, the first spring lifts and resets the core tube 9, allowing the end cap 10 to seal the lower end of the sleeve 19 and prepare for further injection molding.

[0050] In this embodiment, the middle section of the sleeve 19 is provided with an upper water inlet 17. The core assembly 4 includes a sealing sleeve 18 that fits within the middle section of the sleeve 19 and seals the upper water inlet 17. A second piston 16 and a second spring are located at the top of the sleeve 19. The second piston 16 receives fluid from the high-pressure unit and forces the sleeve 19 downward, exposing the upper water inlet 17 to the sealing sleeve 18 and communicating with the interior of the preform. The second spring is compressed and extended by the sleeve 19, accumulating a preload that forces the sleeve 19 upward. Both the second piston 16 and the spring are positioned at the top of the sleeve 19, effectively clear of the bottom of the core, ensuring smooth insertion into the injection or blowing chamber. The second piston 16 is actuated by high-pressure fluid from an accumulator 21. This simplifies the device structure by eliminating a drive source and ensures that the movement of the sleeve 19 is synchronized with the blowing process, ensuring accurate blowing. The second piston 16 can be actuated when the accumulator 21 delivers high-pressure liquid to the preform, exposing the upper water inlet 17. The second spring can lift and reset the sleeve 19 after the bottle blowing operation is completed, so that the upper water inlet 17 is hidden in the sealing sleeve 18 to prepare for the next injection molding.

[0051] In this embodiment, two blowing mechanisms 3 are positioned on either side of the injection molding mechanism 2. The conveying mechanism includes two core assemblies 4, each corresponding to the blowing mechanisms 3. This allows the core assemblies 4 to alternately obtain preforms within the injection molding mechanism 2 and transfer them to the corresponding blowing mechanisms 3. The injection molding mechanism 2 takes a shorter time to complete a single injection molding operation, while the blowing mechanism 3 takes a longer time to complete a single blowing operation. By providing two blowing mechanisms 3 to work with one injection molding mechanism 2, the efficiency of the injection molding mechanism 2 is effectively improved, thereby enhancing processing efficiency. Furthermore, the injection molding mechanism 2 can be provided with multiple injection cavities, and the blowing mechanism 3 is provided with a matching number of blowing cavities. This allows the injection molding mechanism 2 to simultaneously form multiple preforms in a single injection molding operation. Preforms produced in the same batch are then transferred to the corresponding blowing cavities within the blowing mechanism 3 on one side and the blowing operation is completed simultaneously, effectively improving processing efficiency.

[0052] In this embodiment, a waste liquid collection tank is provided below the bottle blowing mechanism 3. Liquid leaking from the bottle blowing chamber is recovered into the liquid storage tank 6 through the waste liquid collection tank. The waste liquid collection tank is used to receive liquid dumped from the bottle body so that it can be cooled, recovered, and refilled into the bottle for blowing, thereby reducing processing costs by reducing liquid loss.

[0053] In this embodiment, the temperature difference between the preheated liquid and the bottle blank in the blowing chamber is A, and A≤70°. This ensures that the bottle blank will not be unable to expand due to local overcooling and hardening, and ensures that the bottle blank is blown into a bottle body evenly, reducing the scrap rate. It can also effectively reduce the temperature requirement for the liquid, ensure that the high-pressure part obtains sufficient liquid, and improve production efficiency.

[0054] In this embodiment, the buffer chamber is provided with a compensating heating component, which can not only keep the liquid in the buffer chamber warm, but also perform compensating heating when the temperature of the liquid in the buffer chamber cannot meet the blowing requirements, thereby ensuring that the liquid in the buffer chamber always remains within the preset temperature range, effectively reducing the temperature difference between the liquid and the bottle blank, and improving the success rate of bottle processing.

[0055] In this embodiment, the granular raw material used for injection molding to form the bottle blank can be selected as needed, and the liquid input into the core through the low-pressure part for cooling and shaping the bottle blank can be temperature-adjusted according to the type of granular raw material to meet the bottle blank processing requirements, which should also be regarded as a specific implementation method of this embodiment.

[0056] As can be understood, the frame 1 is equipped with a pre-inflation assembly corresponding to the bottle blowing mechanism 3. The pre-inflation assembly delivers gas to the bottle body located in the bottle blowing chamber through the core assembly 4, thereby expanding the preform and separating it from the outer wall of the core assembly 4. Before liquid is blown, the preform can be pre-inflated using the pre-inflation assembly to appropriately expand the preform to ensure that the inner wall of the preform is separated from the outer wall of the core, facilitating liquid flow within the preform and ensuring that all areas of the inner wall of the preform are evenly expanded.

[0057] Example 2:

[0058] Compared with the first embodiment, this embodiment provides another specific liquid blow molding machine.

[0059] In this embodiment, the frame 1 is provided with a sealing mechanism corresponding to the bottle blowing mechanism 3. The sealing mechanism seals the bottle body blown into shape by the liquid, thereby hermetically retaining the liquid in the bottle body and forming the final product. The final product to be filled into the bottle body later serves as the liquid for the vertical bottle body. After the liquid is poured into the bottle body, it is directly sealed by the sealing mechanism. This eliminates the need to pour the liquid after blowing the bottle body and directly completes the filling of the final product. This eliminates the need for intermediate disinfection, cleaning, and filling steps, effectively improving production efficiency, and effectively ensuring that the liquid in the bottle body remains sterile, effectively extending the shelf life of the final product.

[0060] In this embodiment, the frame 1 is provided with a sealing mechanism that matches the bottle blowing mechanism 3. The sealing mechanism can seal the bottle body that has been blown and filled with the final product in a sterile environment to ensure that the liquid in the bottle body will not be contaminated by bacteria.

[0061] In this embodiment, the outlet of the accumulator 21 is connected to the external channel 12 via a compensation tube 22 with a solenoid valve. The compensation tube 22 is located above the external channel 12. The length of the section of the compensation tube 22 between the solenoid valve and the external channel 12 is adjusted to compensate for the liquid in the bottle. The liquid in the compensation tube 22 adjusts the liquid level in the bottle when the core is removed from the bottle to compensate for the space left after the core is removed, ensuring that the liquid level in the bottle meets the filling requirements. Specifically, due to the difference in volume between the bottle and the core, the position of the solenoid valve on the compensation tube 22 is adjusted to adjust the volume of liquid reserved in the compensation tube 22, thereby ensuring that the liquid level in the bottle can return to the preset height through compensation after the core is removed.

[0062] In this embodiment, the liquid is a moderately heatable beverage, ensuring accurate filling and blown-into-bottle blown preforms, while also effectively preventing the beverage's shelf life from being affected by heating. When the temperature of the liquid in the buffer chamber exceeds a preset temperature range, the liquid flow rate through the injection molding mechanism is increased to lower the temperature, preventing deterioration of the liquid due to excessive temperature.

[0063] The other structures and effects of the liquid blow molding machine described in this embodiment are consistent with those in the first embodiment and will not be described in detail.

[0064] Example 3:

[0065] Compared with the first or second embodiment, this embodiment provides another liquid blow molding machine.

[0066] In this embodiment, the core assembly 4 includes an injection core that can be vertically plugged and pulled out at the injection molding mechanism 2, a blowing core that can be vertically plugged and pulled out at the blowing mechanism 3, and a half clamp that can move back and forth between the injection molding mechanism 2 and the blowing mechanism 3. The liquid in the liquid storage tank 6 is extracted by the low-pressure part and preheated when it flows through the injection molding mechanism 2 through the injection core. The half clamp clamps the bottle blank in the injection cavity and transfers it to the blowing cavity. The high-pressure part receives the liquid from the injection core and inputs it into the bottle blank in the blowing cavity through the blowing core, so that the bottle blank is blown into a bottle body by the liquid.

[0067] In this embodiment, the core assembly 4 comprises an independently configured injection core and a blow molding core, effectively simplifying the equipment structure and facilitating processing and maintenance. The injection core is provided with a cooling channel connected to the low-pressure section, while the blow molding core is provided with a blowing channel connected to the high-pressure section. A buffer chamber 13 is disposed between the cooling channel and the high-pressure section. During operation, the low-pressure section first draws liquid from the liquid reservoir 6 and injects it into the cooling channel, both cooling and shaping the preform and preheating the liquid. The preheated liquid is then collected in the buffer chamber 13 for use by the high-pressure section. The preform is then transferred to the blow molding chamber by a half clamp. The high-pressure section, via a high-pressure water pump 20, squeezes the liquid in the buffer chamber 13 into an accumulator 21. Finally, the accumulator 21 pumps its liquid into the preform, allowing it to be blown into a bottle.

[0068] The other structures and effects of the liquid blow molding machine described in this embodiment are consistent with those of the first or second embodiment and will not be described in detail.

Claims

1. A liquid blow molding machine using a one-step method, comprising a frame (1), wherein the frame (1) is provided with an injection molding mechanism (2) with an injection molding cavity, a bottle blowing mechanism (3) with a bottle blowing cavity, and a conveying mechanism capable of reciprocating between the injection molding cavity and the bottle blowing cavity, characterized in that: The conveying mechanism includes a core assembly (4) and an infusion assembly (5) corresponding to the core assembly (4). The core assembly (4) inserted in the injection molding cavity transfers the processed bottle blank to the blowing cavity. The infusion assembly (5) recovers the liquid used to cool and shape the bottle blank in the injection molding mechanism (2) and is used to blow the bottle body in the blowing mechanism (3) to preheat the liquid and reduce the temperature difference between the liquid and the bottle blank. The infusion assembly (5) includes a liquid storage tank (6), a low-pressure part that cools and shapes the bottle blank through the core assembly (4) inserted in the injection molding cavity, and a high-pressure part that blows the bottle blank into the bottle body through the core assembly (4) inserted in the blowing cavity. The liquid in the liquid storage tank (6) is extracted by the low-pressure part and preheated when it flows through the injection molding mechanism (2) through the core assembly (4). The high-pressure part receives the liquid from the low-pressure part and inputs it into the blowing cavity through the core assembly (4). The core assembly (4) includes a movable platform (8) that can reciprocate between an injection molding mechanism (2) and a bottle blowing mechanism (3) and a core body arranged on the movable platform (8). The core body includes a sleeve (19) and a core tube (9) inserted in the sleeve (19). A head (10) is provided at the bottom of the core tube (9). An internal channel (11) with a cooling port at the bottom is formed in the core tube (9). An external channel (12) is provided between the core tube (9) and the sleeve (19). The internal channel (11) and the external channel (12) are connected through the cooling port. The core tube (9) is vertically raised and lowered so that the core assembly (4) can be switched between an injection molding state in which the head (10) blocks the lower end of the external channel (12) and a bottle blowing state in which the head (10) stretches the bottle downward and the external channel (12) is connected to the inner cavity of the bottle.

2. A liquid blow molding machine using a one-step method according to claim 1, characterized in that: The frame (1) is provided with a sealing mechanism corresponding to the bottle blowing mechanism (3), and the sealing mechanism performs a sealing operation on the bottle body blown into shape by the liquid, so that the liquid is sealed and retained in the bottle body to form a final product; or, a waste liquid collecting tank is provided below the bottle blowing mechanism (3), and the liquid leaked from the bottle blowing cavity is recovered into the liquid storage tank (6) through the waste liquid collecting tank; or, a pre-filling assembly corresponding to the bottle blowing mechanism (3) is provided on the frame (1), and the pre-filling assembly transports gas to the bottle body located in the bottle blowing cavity through the core assembly (4), so that the bottle blank expands and separates from the outer wall of the core assembly (4).

3. A liquid blow molding machine using a one-step process according to claim 1, characterized in that: The blowing mechanisms (3) are two and are separately arranged on both sides of the injection molding mechanism (2). The conveying mechanism includes two groups of core components (4) corresponding to the blowing mechanisms (3) one by one, so that the core components (4) alternately obtain bottle blanks in the injection molding mechanism (2) and transfer them to the corresponding blowing mechanisms (3).

4. A liquid blow molding machine using a one-step process according to any one of claims 1 to 3, characterized in that: The infusion assembly (5) comprises a buffer chamber (13), and the buffer chamber (13) recovers the liquid inputted into the injection molding mechanism (2) by the low-pressure part, which is then extracted by the high-pressure part and blown into a bottle body.

5. A liquid blow molding machine using a one-step process according to claim 4, characterized in that: The low-pressure part includes a low-pressure water pump (7), the inlet of the low-pressure water pump (7) is connected to the liquid storage tank (6), and the outlet of the low-pressure water pump (7) is connected to the built-in channel (11) through a pipeline with a control valve; or, the upper end of the external channel (12) is connected to the buffer chamber (13) through a pipeline with a control valve, so that the liquid in the built-in channel (11) flows through the external channel (12) to be preheated and collected in the buffer chamber (13); or, a liquid replenishing pipeline (14) with a control valve is provided between the buffer chamber (13) and the liquid storage tank (6), and the buffer chamber (13) receives liquid from the liquid storage tank (6) through the liquid replenishing pipeline (14); or, a first piston (15) and a first spring are provided at the top of the core tube (9), and the first piston (15) receives liquid from the high-pressure part and drives the sealing member through the core tube (9). The head (10) stretches the preform downward so that the lower end of the external channel (12) is exposed and a lower water injection port (23) is formed for injecting liquid into the preform. The first spring is pushed and contracted by the core tube (9) and accumulates a preload force to drive the core tube (9) to return upward. Alternatively, the middle section of the sleeve (19) is provided with an upper water injection port (17). The core assembly (4) includes a sealing sleeve (18) sleeved on the middle section of the sleeve (19) and blocking the upper water injection port (17). The top end of the sleeve (19) is provided with a second piston (16) and a second spring. The second piston (16) receives liquid from the high-pressure section and drives the sleeve (19) to move downward so that the upper water injection port (17) is exposed outside the sealing sleeve (18) and communicates with the inner cavity of the preform. The second spring is pushed and contracted by the sleeve (19) and accumulates a preload force to drive the sleeve (19) to return upward.

6. The liquid blow molding machine using a one-step method according to claim 4, characterized in that: The high-pressure portion comprises a high-pressure water pump (20) and an accumulator (21) connected in series, the inlet of the high-pressure water pump (20) being connected to the buffer chamber (13), the outlet of the accumulator (21) being connected to the upper end of the external channel (12), and when the core assembly (4) is inserted into the bottle blowing chamber and switched to the bottle blowing state, the accumulator (21) transports liquid to the inner cavity of the bottle blank through the external channel (12), so that the bottle blank is blown into a bottle body.

7. A liquid blow molding machine using a one-step process according to claim 6, characterized in that: The volume of the liquid in the accumulator (21) is greater than the volume of the bottle body, and the liquid in the accumulator (21) fills the bottle body and falls back to a preset liquid level when the core assembly (4) is pulled out; or, the outlet of the accumulator (21) is connected to the external channel (12) through a compensation pipe (22) with a solenoid valve, and the compensation pipe (22) is located above the external channel (12). By adjusting the length of the section of the compensation pipe (22) between the solenoid valve and the external channel (12), compensation adjustment is performed on the liquid in the bottle body.

8. A liquid blow molding machine using a one-step process according to any one of claims 1 to 3, characterized in that: The core assembly (4) comprises an injection core which is vertically pluggable and arranged at the injection molding mechanism (2), a bottle blowing core which is vertically pluggable and arranged at the bottle blowing mechanism (3), and a half clamp which can move back and forth between the injection molding mechanism (2) and the bottle blowing mechanism (3). The liquid in the liquid storage tank (6) is extracted by the low-pressure part and preheated when flowing through the injection molding mechanism (2) through the injection core. The half clamp clamps the bottle blank in the injection molding cavity and transfers it to the bottle blowing cavity. The high-pressure part receives the liquid from the injection core and inputs it into the bottle blank in the bottle blowing cavity through the bottle blowing core, so that the bottle blank is blown into a bottle body by the liquid.

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