PET bottle blowing machine

Abstract

The utility model relates to a PET (Polyethylene Terephthalate) bottle blowing machine. An existing PET bottle blowing machine is complex in structure. The bottle blowing device comprises a bottle blowing mechanism, the bottle blowing mechanism comprises a mold assembly and a bottle making assembly, the mold assembly comprises a mold plate and a bottle blowing mold, a heating system is arranged on the bottle blowing mold, the bottle making assembly comprises a stretching rod, an air path channel and a water path channel, and the heating system generates heat and raises the temperature of the wall face of a mold cavity. A bottle blank in the mold cavity is blown into a bottle body by high-pressure air flow from the air channel, and the bottle body is filled and cooled by a high-pressure water source from the water channel after being contacted with the wall surface of the mold cavity and heated, so that the bottle body is quenched. A bottle blank is blown into a bottle body through the air channel, the bottle body is heated through the bottle blowing mold, and the bottle body is cooled, pressed and shaped through the water channel, so that it is ensured that the bottle body can be quenched, the high-temperature resistance of the finished bottle body is effectively improved, the structure of the bottle blowing mechanism is effectively simplified, and the use experience is improved.

Description

Technical Field

[0001] The utility model relates to the field of plastic processing, in particular to a bottle blowing machine. Background Art

[0002] The existing PET bottle blowing machine includes a frame and a drying tunnel mechanism, a conveying assembly and a bottle blowing mechanism arranged on the frame. The conveying assembly drives the preform to pass through the drying tunnel mechanism and the bottle blowing mechanism and completes the bottle body blowing operation. Since the bottle body made of PET material needs to undergo a quenching operation to obtain high temperature resistance, the quenching operation includes a heating operation and a cooling operation. The bottle blowing mechanism includes a first mold assembly, a second mold assembly, and a first bottle making assembly and a second bottle making assembly matched with the first mold assembly and the second mold assembly respectively. The first mold assembly is provided with a first bottle blowing mold with a heating system, so that the first bottle blowing mold can always maintain a high temperature. The second mold assembly is provided with a second bottle blowing mold with a cooling water pipe, so that the second bottle blowing mold can always maintain a lowered temperature. During processing, the preform is first heated and then enters the first mold assembly and is blown into a semi-finished product by the first blowing assembly. The semi-finished product will complete the heating operation due to contact with the first bottle blowing mold. After that, the semi-finished product will be sent to the second mold assembly and blown into a finished bottle body by the second blowing assembly. The bottle body will complete the cooling operation due to contact with the second bottle blowing mold, thereby realizing the quenching operation of the bottle body.

[0003] In the above equipment, in order to complete the quenching operation, two sets of mold assemblies and blowing assemblies need to be set up, which not only makes the equipment structure complicated, the volume increases and requires a larger area, the energy consumption increases, and the equipment cost increases, but also increases the duration of a single processing due to the need for two sets of mold assemblies for opening and closing switching and transportation, thereby reducing production efficiency, increasing processing costs, and affecting the user experience. Utility Model Content

[0004] In order to address the deficiencies in the prior art, the utility model provides a PET bottle blowing machine, which utilizes a mold cavity to heat a blown bottle body, and utilizes a water channel to perform high-pressure water injection and cooling on the blown bottle body in the mold cavity, thereby ensuring that the quenching operation of the bottle body is completed, and that the heating operation and the cooling operation are completed in the same mold assembly, effectively simplifying the structure of the bottle blowing mechanism, and improving processing efficiency and user experience by eliminating the transfer operation between different mold assemblies.

[0005] The utility model is realized in the following manner: a PET bottle blowing machine comprises a frame, a bottle blowing mechanism and a conveying mechanism arranged on the frame, the bottle blowing mechanism comprises a mold assembly and a bottle making assembly, the mold assembly comprises a template that can be opened and closed and a bottle blowing mold that is arranged on the opposite surfaces of the template and can be closed to form a mold cavity, the bottle blowing mold is provided with a heating system, the bottle making assembly comprises a stretching rod that can be vertically telescopically arranged on the frame, and an air channel and a water channel that can be connected to the bottle blank in the mold cavity, the heating system generates heat and increases the temperature of the mold cavity wall, the bottle blank in the mold cavity is first blown into a bottle body by a high-pressure airflow from the air channel, the bottle body is heated by contact with the mold cavity wall, and then filled and cooled by a high-pressure water source from the water channel, so that the bottle body completes the quenching operation. A heating system is set on the bottle blowing mold and matching air channels and water channels are set. The bottle blank is first blown into a bottle body through the air channel, and then the bottle body is heated by the bottle blowing mold. Finally, the bottle body is cooled and pressed into shape by the water channel. This ensures that the bottle body can complete the quenching operation. Water is directly poured into the bottle body and the bottle body is contact-cooled. The cooling effect is improved by shortening the cooling time, thereby effectively improving the high temperature resistance of the bottle body. A set of mold components can also be used to realize bottle blowing and quenching operations, effectively simplifying the structure of the bottle blowing mechanism, reducing the volume and reducing energy consumption, facilitating assembly and production, reducing equipment processing costs, and eliminating the need to transfer the bottle body between mold components, effectively shortening the processing time, improving processing efficiency and output, and improving the user experience.

[0006] Preferably, the bottle making assembly includes a common channel, the inner port of the common channel is connected to the bottle blank in the mold cavity, and the outer port can be switched to be connected to the air channel and the water channel. The air channel and the water channel are both connected to the processed parts in the mold cavity through the common channel, which not only simplifies the structure by sharing the common channel, facilitates processing and assembly, and reasonably utilizes the effective space for pipeline layout, but also ensures that the high-pressure airflow and water source can be switched and transported according to the use requirements, ensuring that the bottle blank can complete the bottle body blowing operation and quenching operation in the same mold assembly. The processed parts in the mold cavity can be either unblown bottle blanks or blow-formed bottles. When blowing the bottle, the air pressure in the bottle body is detected by the air pressure detection module. If there is air leakage in the bottle body, it means that the bottle body is unqualified, and the water channel is controlled not to fill the bottle body with water to prevent the water source from diffusing in the mold.

[0007] Preferably, the conveying mechanism includes a sealing member that can be inserted into the mouth of the preform at the top and a driving member that drives the sealing member to move the preform. The bottle making assembly includes a connecting seat fixedly connected to the frame and a three-way pipe fitting arranged on the connecting seat. The three-way pipe fitting includes a mixed outlet connected to the common channel and an air channel inlet and a water channel inlet respectively connected to the air channel and the water channel. A one-way valve is arranged at the air channel inlet. The sealing member is sealed and connected to the mouth of the preform, which not only drives the preform to be conveyed along a preset path, but also cooperates with the connecting seat to form a common channel, ensuring that the air channel and the water channel arranged on the three-way pipe fitting are connected and controlled with the workpiece in the mold cavity through the common channel, thereby ensuring that the quenching operation is smoothly implemented. The three-way pipe fitting allows the water channel and the air channel to be independently connected to the common channel according to the use requirements, thereby realizing the independent input of high-pressure airflow and water source into the workpiece. The one-way valve allows the high-pressure airflow in the air channel to be transmitted to the three-way pipe fitting, and prevents the high-pressure airflow and water source in the three-way pipe fitting from flowing back into the air channel, thereby ensuring that the air pressure in the common channel and the workpiece remains constant, thereby playing a role in pressurizing and shaping the bottle body, and preventing the air channel from being blocked due to the entry of water, and preventing water from scattering and partially contacting the bottle preform when the subsequent bottle preform is inflated and blown, thereby preventing the bottle preform from expanding and contracting unevenly and developing pitting due to partial contact with the water source, thereby ensuring that the quality of the bottle body meets the use requirements.

[0008] Preferably, a vertically penetrating lower through hole is provided in the connection seat, and a vertically penetrating upper through hole is provided in the sealing member. When the sealing member is matched and connected with the connection seat, the upper through hole and the lower through hole are vertically aligned to form a lifting channel for the stretching rod to lift and lower. The stretching rod passes through the lifting channel from bottom to top and is inserted into the bottle blank, so that the bottle blank is blown into a bottle body by the blowing assembly. The sealing member can move along a preset path with the workpiece. When the bottle blank is moved into the mold assembly and connected to the connection seat through the sealing member, the upper through hole and the lower through hole are axially aligned to form a lifting channel. The stretching rod located on the frame passes through the lower through hole and the upper through hole from bottom to top and then is inserted into the bottle blank and vertically stretched to facilitate the bottle blank to be blown into a bottle body. The top of the sealing member is inserted into the blank mouth of the bottle blank. The upper end of the upper through hole is opened on the top surface of the sealing member and communicates with the inner cavity of the bottle blank, which facilitates the connection between the inner cavity of the bottle blank and the air channel or the water channel.

[0009] Preferably, the lower through hole includes a large diameter section and a small diameter section arranged in an upper and lower manner, and the side wall of the large diameter section is connected to a three-way pipe through a side tube, and the side tube, the lower through hole and the upper through hole are connected in series in sequence to form the common channel. The side tube, the large diameter section and the upper through hole are connected in sequence to form the common channel, which not only ensures that the common channel can be connected to the inner cavity of the workpiece, but also improves the space utilization efficiency by sharing the common channel, and improves the transportation efficiency of high-pressure airflow and water source by setting a larger-sized common channel in a limited space. A sealing ring is provided in the lower section of the lower through hole, and the inner edge of the sealing ring forms the small diameter section, ensuring that the inner edge of the sealing ring is sealed and fitted with the outer wall of the stretch rod.

[0010] Preferably, the diameter of the small diameter section matches the diameter of the stretching rod to eliminate the gap between the inner wall of the small diameter section and the outer wall of the stretching rod. The small diameter section fits tightly against the outer wall of the stretching rod, which not only serves as a seal to prevent leakage of high-pressure airflow or water in the public channel, thereby ensuring that the pressure inside the workpiece remains constant, but also ensures that the stretching rod can be smoothly lifted and lowered vertically.

[0011] Preferably, the diameters of the large diameter section and the upper through hole are larger than the diameter of the stretching rod, so that a partial section of the common channel is formed between the inner wall of the large diameter section and the outer wall of the stretching rod, and between the inner wall of the upper through hole and the outer wall of the stretching rod. The large diameter section, the upper through hole and the stretching rod are coaxially arranged with each other, and a common channel with an annular cross section is formed by setting differentiated diameters, ensuring that high-pressure airflow and water can be smoothly transported.

[0012] Preferably, the common channel is opened along the axial direction of the stretching rod, and the inner port of the common channel is arranged on the middle section of the stretching rod. The common channel is arranged in the stretching rod, and the high-pressure airflow and water source enter the inner cavity of the workpiece through the common channel arranged in the stretching rod. The bottom end of the stretching rod is connected to the air channel and the water channel respectively.

[0013] Preferably, a heat insulation layer is provided between the template and the bottle blowing mold to limit the heat on the bottle blowing mold from diffusing outward through the template. The template drives the bottle blowing mold to close and enclose to form the mold cavity. The heat insulation layer is provided between the template and the bottle blowing mold, which will not hinder the opening and closing switching of the bottle blowing mold, and can effectively prevent the heat on the bottle blowing mold from diffusing outward through the template, thereby keeping the bottle blowing mold warm, effectively improving the heat utilization efficiency, and reducing the power consumption of the heating system.

[0014] Preferably, the stretching rod is provided with an axially penetrating external discharge channel, the inlet of the external discharge channel is opened on the top of the stretching rod, and a pressure-maintaining valve is provided on the external discharge channel. The water source in the water channel is input into the bottle body and drives the high-pressure airflow in the bottle body to be discharged through the external discharge channel, so that the bottle body is filled with water and evenly cooled. The stretching rod is inserted into the bottle body and connected to the outside through the external discharge channel. When the water channel fills the bottle body with water, the high-pressure airflow in the bottle body is discharged through the external discharge channel, so that the water source can fill the bottle body and cool the bottle body. The water source is in direct contact with the bottle body, and the quenching effect is improved by improving the cooling effect, thereby improving the high temperature resistance of the bottle body. The pressure-maintaining valve is arranged in the external discharge channel, so that the high-pressure airflow or water source in the bottle body needs to reach a certain pressure before the pressure-maintaining valve is triggered and discharged, ensuring that a high pressure is always maintained in the bottle body, so that the bottle body will not shrink and deform due to heat, and the bottle body contour meets the processing requirements. The inlet of the external discharge channel is arranged at the top end of the stretching rod, and the top end of the stretching rod is located at the top of the bottle body, so that the high-pressure airflow at the top of the bottle body can be discharged through the external discharge channel, ensuring that the water source can fill the bottle body.

[0015] Preferably, the pressure in the water channel is greater than the opening pressure threshold of the pressure-maintaining valve, and the opening pressure threshold of the pressure-maintaining valve is greater than the high-pressure airflow pressure in the air channel. The water source in the water channel is input into the bottle body at a relatively high pressure and drives the high-pressure airflow to open the pressure-maintaining valve and discharge it, ensuring that the water source can smoothly fill the bottle body. The high-pressure airflow in the airflow channel cannot open the pressure-maintaining valve independently, ensuring that the preform can be smoothly blown into a bottle body under the action of the high-pressure airflow, effectively reducing the amount of high-pressure airflow required for the bottle blowing operation and improving processing efficiency.

[0016] Preferably, the rack is provided with a bottle-removing mechanism, which includes a mechanical arm for driving the preform to be separated from the sealing member and a water collecting tank arranged at the bottom of the rack. The sealing member drives the bottle body to be transferred from the mold assembly to the bottle-removing mechanism, and the water source in the bottle body falls into the water collecting tank. The water source in the water collecting tank flows back to the water storage tank through the recovery pipe and is reused after cooling. The processing part is arranged with the bottle mouth facing downward. When the sealing member is separated from the connecting seat, the lower port of the upper through hole is exposed, so that the water source in the bottle body will flow downward through the upper through hole. After the sealing member is separated from the connecting seat, the water collecting tank receives the water source flowing out of the bottle body and transports it to the water storage tank. The water source is reused after cooling in the water storage tank, which effectively improves the water source utilization efficiency. The water collecting tank is arranged along the moving direction of the bottle body, and the water source dripping from the bottle body during the transportation process can fall into the water collecting tank, which not only improves the water source collection ratio and the water source reuse rate, but also prevents the water source from flowing on the equipment, thereby protecting the equipment.

[0017] Preferably, the heating system includes an electric heating rod inserted in the bottle blowing mold and a temperature controller for controlling the operation of the electric heating rod, so that the temperature of the inner wall of the mold cavity can be controlled. The electric heating rod generates heat when it is powered on and raises the temperature of the inner wall of the mold cavity to meet the requirements of heating the bottle body.

[0018] The beneficial effects of the utility model include: a heating system is arranged on the bottle blowing mold and matching air channels and water channels are arranged, the bottle blank is first blown into a bottle body through the air channel, the bottle body is then heated by the bottle blowing mold, and finally the bottle body is cooled and pressed to shape by the water channel, which ensures that the bottle body can complete the quenching operation, and the water source is directly poured into the bottle body and the bottle body is contact-cooled, and the cooling effect is improved by shortening the cooling time to achieve the quenching purpose, thereby effectively improving the high temperature resistance of the bottle body and improving production efficiency, and a set of mold components can be used to realize bottle blowing operation and quenching operation, which effectively simplifies the structure of the bottle blowing mechanism, facilitates assembly and production, reduces equipment processing costs, and does not need to transfer the bottle body between mold components, effectively shortens the time required for processing, improves processing efficiency and output, and improves user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the bottle blowing machine described in Example 1;

[0020] Figure 2 This is a perspective structural schematic diagram of the stretching rod in the first embodiment when it is in an idle position;

[0021] Figure 3 It is a schematic cross-sectional structural diagram of the stretching rod in the first embodiment when it is in an idle position;

[0022] Figure 4 It is a schematic cross-sectional structural diagram of the stretching rod in the first embodiment when it is in the stretching station;

[0023] Figure 5 It is a cross-sectional schematic diagram of the assembly structure of the water collecting tank described in Example 1;

[0024] In the figure: 1. frame, 2. bottle blowing mechanism, 3. conveying mechanism, 4. bottle blowing mold, 5. heating system, 6. air channel, 7. water channel, 8. public channel, 9. sealing part, 10. connecting seat, 11. three-way pipe fitting, 12. one-way valve, 13. upper through hole, 14. large diameter section, 15. small diameter section, 16. stretching rod, 17. side pipe, 18. external discharge channel, 19. pressure maintaining valve, 20. water collecting tank, 21. recovery pipe. DETAILED DESCRIPTION

[0025] The essential features of the present utility model are further described below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Embodiment 1:

[0027] This embodiment provides a PET bottle blowing machine.

[0028] like Figure 1 and 2A PET bottle blowing machine shown in the figure is composed of a frame 1, a bottle blowing mechanism 2 and a conveying mechanism 3 arranged on the frame 1, the bottle blowing mechanism 2 includes a mold assembly and a bottle making assembly, the mold assembly includes a bottle blowing mold 4 that can be closed to form a mold cavity, the bottle blowing mold 4 is provided with a heating system 5, the bottle making assembly includes a stretching rod 16 that can be vertically telescopically arranged on the frame 1, and an air channel 6 and a water channel 7 that can be connected to the bottle blank in the mold cavity. The heating system 5 generates heat and increases the temperature of the mold cavity wall. The bottle blank in the mold cavity is first blown into a bottle body by a high-pressure airflow from the air channel 6. After the bottle body is heated by contact with the mold cavity wall, it is filled and cooled by a high-pressure water source from the water channel 7, so that the bottle body completes the quenching operation. A heating system 5 is provided on the bottle blowing mold 4, and matching air channels 6 and water channels 7 are provided. The preform is first blown into a bottle body through the air channel 6, and then the bottle body is heated by the bottle blowing mold 4. Finally, the bottle body is cooled and pressed to shape by the water channel 7, which ensures that the bottle body can complete the quenching operation. Water is directly poured into the bottle body and the bottle body is contact-cooled. The cooling effect is improved by shortening the cooling time, thereby effectively improving the high temperature resistance of the bottle body. A set of mold components can also be used to realize the bottle blowing operation and quenching operation, which effectively simplifies the structure of the bottle blowing mechanism 2, facilitates assembly and production, reduces equipment processing costs, and does not need to transfer the bottle body between mold components, effectively shortens the processing time required, improves processing efficiency and output, and improves the user experience.

[0029] In this embodiment, the bottle making assembly includes a common channel 8, the inner end of which is connected to the bottle blank in the mold cavity, and the outer end can be switched to be connected to the air channel 6 and the water channel 7. The inner end of the common channel 8 passes through the sealing member 9 and is connected to the inner cavity of the workpiece, and the outer end can be selectively connected to the air channel 6 and the water channel 7, which is convenient for the inner cavity of the workpiece to be independently connected to the air channel 6 or the water channel 7 according to processing needs, and also effectively utilizes the limited space in the sealing member 9, and improves the transmission efficiency of the high-pressure airflow and water source by sharing the common channel 8, thereby shortening the processing time and improving the processing efficiency.

[0030] In this embodiment, a drying tunnel mechanism is provided on the frame 1, and the conveying mechanism 3 includes a sealing member 9 whose top can be inserted into the mouth of the preform and a driving member that drives the sealing member 9 to move the preform. The preform is sleeved and connected to the sealing member 9 with the mouth of the preform facing downward. Driven by the driving member, the sealing member 9 carries the preform through the drying tunnel mechanism, the bottle blowing mechanism 2 and the bottle removing mechanism in sequence.

[0031] During processing, the preforms are heated and softened by the drying tunnel mechanism, and then moved to the bottle blowing mechanism 2 to complete the bottle blowing operation and quenching operation. The bottle body is moved to the bottle removal mechanism and separated from the bottle blowing machine, thereby forming a PET bottle body with high temperature resistance. Figure 3 and 4As shown, after the preform enters the bottle blowing mechanism 2, the bottle body is processed through the following steps:

[0032] In the first step, the heating system 5 is powered on to generate heat and heat the bottle blowing mold 4 so that the temperature of the inner wall of the mold cavity reaches a preset temperature;

[0033] In the second step, the sealing member 9 moves with the preform to the blowing station, the sealing member 9 is matched and connected with the connecting seat 10 and the public channel 8 is connected, and the bottle blowing mold 4 is closed to form a mold cavity that wraps the preform;

[0034] In the third step, the stretching rod 16 passes through the lifting channel from bottom to top and is inserted into the preform. The preform is vertically stretched under the stretching action of the stretching rod 16. At the same time, the gas channel 6 is transported into the preform through the common channel 8, driving the preform to expand in the mold cavity and form a bottle body with the same contour as the mold cavity.

[0035] The fourth step is to make the bottle body formed by blow molding fit closely with the inner wall of the mold cavity so that the bottle body receives heat from the mold cavity and realizes the heating operation;

[0036] In the fifth step, the bottle body is heated and moderately shrunk, and the water channel 7 pours water into the bottle body through the common channel 8. The water source gathers at the bottom of the bottle body and fills the bottle body from bottom to top. The high-pressure airflow retained in the bottle body is discharged outward through the external discharge channel 18 in the stretching rod 16, ensuring that the inner cavity of the bottle body can be filled with water and the bottle body is cooled. At the same time, by increasing the water source pressure, the bottle body is driven to fit closely with the inner wall of the mold cavity during cooling and shaping, ensuring that the shape of the bottle body meets the production requirements;

[0037] In the sixth step, the stretching rod 16 is disengaged from the bottle body downward, the mold assembly is separated, and the sealing member 9 drives the bottle body to be disengaged from the mold assembly and transported to the bottle removal mechanism.

[0038] After the bottle body is separated from the bottle blowing mechanism 2, the sealing member 9 is separated from the connecting seat 10, so that the lower end of the upper through hole 13 of the sealing member 9 is exposed, and the water in the bottle body will flow downward through the upper through hole 13 and be collected by the water collecting trough 20 and transported to the water storage tank. The water in the water storage tank is cooled and refilled for use, thereby realizing the reuse of water.

[0039] In this embodiment, the water channel 7 includes a water pump, which extracts water from the water tank and delivers it to the public channel 8. The gas channel 6 includes an air pump and an air tank, and the high-pressure airflow formed by the air pump is stored in the air tank so that the gas channel 6 can be used at any time. The water channel 7 and the gas channel 6 are both provided with control valves, and the on-off state of the corresponding pipeline is controlled by switching the open and closed state of the control valve, thereby improving the control accuracy.

[0040] In this embodiment, the bottle making assembly includes a connection seat 10 fixedly connected to the frame 1 and a three-way pipe fitting 11 arranged on the connection seat 10, and the three-way pipe fitting 11 includes a mixing outlet connected to the common channel 8 and an air channel inlet and a water channel inlet respectively connected to the air channel 6 and the water channel 7. The three-way pipe fitting 11 is used to connect the common channel 8, the water channel 7 and the air channel 6, so that the common channel 8 can receive a water source or a high-pressure airflow from the water channel 7 or the air channel 6 as needed.

[0041] In this embodiment, the connection seat 10 is provided with a vertically penetrating lower through hole, and the sealing member 9 is provided with a vertically penetrating upper through hole 13. When the sealing member 9 is matched and connected with the connection seat 10, the upper through hole 13 and the lower through hole are vertically aligned to form a lifting channel for the stretching rod 16 to lift and lower. The stretching rod 16 passes through the lifting channel from bottom to top and is inserted into the bottle blank, so that the bottle blank is blown into a bottle body by the blowing assembly. Specifically, the lower through hole includes a large diameter section 14 and a small diameter section 15 arranged up and down, and the side wall of the large diameter section 14 is connected to the three-way pipe 11 through a side tube 17. The side tube 17, the lower through hole and the upper through hole 13 are connected in series in sequence to form the common channel 8. The diameters of the large diameter section 14 and the upper through hole 13 are both larger than the diameter of the stretching rod 16, so that a local section of the common channel 8 is formed between the inner wall of the large diameter section 14 and the outer wall of the stretching rod 16, and between the inner wall of the upper through hole 13 and the outer wall of the stretching rod 16. Annular gaps are reserved between the inner wall of the large diameter section 14 and the outer wall of the stretching rod 16, and between the inner wall of the upper through hole 13 and the outer wall of the stretching rod 16. When the sealing member 9 is matched and connected to the connecting seat 10, the gap is connected in series with the side tube 17 to form the common channel 8, which is convenient for the lifting and lowering of the stretching rod 16 and also convenient for the transportation of high-pressure airflow and water source.

[0042] In this embodiment, the lower port of the upper through hole 13 is in the shape of a truncated cone that is larger at the top and smaller at the bottom and is open outward, and the upper port of the large-diameter section 14 is in the shape of a truncated cone that is larger at the top and smaller at the bottom and is open inward. When the sealing member 9 is vertically connected to the corresponding connecting seat 10, the lower port of the upper through hole 13 fits tightly with the upper port of the large-diameter section 14, which not only plays a role in guiding the docking, but also improves the sealing effect by increasing the contact area.

[0043] In this embodiment, a sealing cylinder is provided at the bottom of the connecting seat 10. When the sealing member 9 moves into place, the sealing cylinder pushes the connecting seat 10 to move upward and fits tightly with the bottom of the sealing member, ensuring that the lower end of the upper through hole 13 and the upper end of the large diameter section 14 are sealed and fit.

[0044] In this embodiment, the diameter of the small diameter section 15 matches the diameter of the stretching rod 16 to eliminate the gap between the inner wall of the small diameter section 15 and the outer wall of the stretching rod 16. The connecting seat 10 is fixed to the frame 1, and the stretching rod 16 can be lifted and switched between the stretching station and the idle station. When the stretching rod 16 is in the stretching station, the top of the stretching rod 16 is located at the top of the bottle body, which stretches the bottle body and facilitates the high-pressure airflow in the bottle body to be discharged smoothly through the external discharge channel 18. When the stretching rod 16 is in the idle position, the top of the stretching rod 16 is located in the small diameter section 15, which blocks the small diameter section 15 and prevents the common channel 8 from communicating with the external space.

[0045] In this embodiment, the stretching rod 16 is provided with an axially penetrating external discharge channel 18, and the inlet of the external discharge channel 18 is opened on the top of the stretching rod 16. The water source in the water channel 7 is input into the bottle body and drives the high-pressure airflow in the bottle body to be discharged through the external discharge channel 18, so that the bottle body is filled with water and cooled evenly. The inlet of the external discharge channel 18 is arranged on the top of the stretching rod 16, so that the inlet is at the top of the bottle body when the stretching rod 16 is in the stretching position, and the water level in the bottle body will rise from bottom to top and drive the high-pressure airflow to converge to the top of the bottle body, thereby ensuring that the high-pressure airflow can be discharged through the external discharge channel 18.

[0046] In this embodiment, a pressure-maintaining valve 19 is provided on the external discharge channel 18, and the pressure-maintaining valve 19 is set to an opening pressure threshold. When the external pressure on the pressure-maintaining valve 19 is greater than the opening pressure threshold, the pressure-maintaining valve 19 will open and conduct. Specifically, the pressure in the water channel 7 is greater than the opening pressure threshold of the pressure-maintaining valve 19, and the water source in the water channel 7 is input into the bottle body at a relatively high pressure and drives the high-pressure airflow to open the pressure-maintaining valve 19 for external discharge, ensuring that the water source can smoothly fill the bottle body. The opening pressure threshold of the pressure-maintaining valve 19 is greater than the high-pressure airflow pressure in the air channel 6, and the high-pressure airflow in the air channel cannot independently open the pressure-maintaining valve 19, ensuring that the bottle blank can be smoothly blown into a bottle body under the action of the high-pressure airflow, effectively reducing the amount of high-pressure air required for the bottle body blowing operation, and improving the processing efficiency. A one-way valve 12 is provided at the air channel inlet to ensure that the water channel 7 does not flow into the air channel 6 when conveying the high-pressure water source to the inner cavity of the bottle body, ensuring that the pressure in the bottle body is always maintained at a high value, thereby ensuring that the bottle body is consistent with the mold cavity contour during cooling and shaping, and ensuring that the product quality meets the production requirements.

[0047] In this embodiment, the frame 1 is provided with a bottle-removing mechanism, and the bottle-removing mechanism includes a mechanical arm that drives the preform to separate from the sealing member 9 and a water collecting trough 20 arranged at the bottom of the frame 1. The sealing member 9 drives the bottle body to be transferred from the mold assembly to the bottle-removing mechanism, and the water in the bottle body falls into the water collecting trough 20. The water in the water collecting trough 20 flows back to the water storage tank and is reused after cooling. The water collecting trough 20 is in the shape of an elongated strip, and the notch is exposed upward. The setting path of the water collecting trough 20 is consistent with the moving path of the sealing member 9 between the bottle blowing mechanism 2 and the bottle-removing mechanism, which not only ensures that the water flowing out of the bottle body when it is transferred to the bottle-removing mechanism can be received by the water collecting trough 20, but also effectively reduces the width of the water collecting trough 20, thereby facilitating installation on the frame 1. Figure 5 As shown, the water collecting tank 20 is provided with an avoidance hole, the connecting seat passes through the avoidance hole and is exposed on the bottom wall of the water collecting tank 20, and a sealing ring is clamped between the periphery of the avoidance hole and the connecting seat, which not only ensures that the water source in the water collecting tank 20 will not leak downward through the gap between the avoidance hole and the connecting seat, but also ensures that the water source in the bottle will flow into the water collecting tank 20 when the sealing member is detached from the connecting seat, thereby preventing the water source from flowing around on the frame.

[0048] In this embodiment, the water source received by the water collecting tank 20 will be centrally transported to the water storage tank, so that the water source can be reused after cooling. The water collecting tank 20 is connected to the water storage tank through a recovery pipe 21, one end of the recovery pipe 21 is exposed on the bottom wall of the water collecting tank 20, and the other end is connected to the water storage tank.

[0049] In this embodiment, the heating system 5 includes an electric heating rod inserted in the bottle blowing mold 4 and a temperature controller for controlling the operation of the electric heating rod, so that the temperature of the inner wall of the mold cavity can be controlled. The heating system 5 is a rod and is inserted in the bottle blowing mold 4, so that the temperature of each area of ​​the inner wall of the mold cavity is uniform, thereby effectively improving the reliability of the heating operation. In addition, the heating system 5 can also be an oil pipe laid in the bottle blowing mold 4, and the bottle blowing mold is heated by hot oil flowing through the oil pipe, which should also be regarded as a specific implementation of this embodiment.

[0050] In this embodiment, the bottle blowing mold 4 can be provided with multiple mold cavities as needed, and each mold cavity is provided with a corresponding water channel, gas channel, common channel and external discharge channel, so as to increase the number of preforms processed in a single time to improve the output. The pressure-maintaining valve can be configured with each mold cavity one by one, or can be configured in common, which should be regarded as a specific implementation of this embodiment.

[0051] Embodiment 2:

[0052] Compared with the first embodiment, this embodiment provides a bottle blowing machine structure.

[0053] In this embodiment, the common channel 8 is opened along the axial direction of the stretching rod 16, and the inner port of the common channel 8 is arranged on the middle section of the stretching rod 16. The stretching rod 16 is tubular, and is provided with an external discharge channel 18 and a common channel 8 which are independent of each other. The external discharge channel 18 is used to discharge the high-pressure airflow in the bottle body, and the common channel 8 is used to transport the high-pressure airflow or water source into the bottle body. The port of the common channel 8 and the inlet of the external discharge channel 18 are arranged far apart to prevent the two from being too close to each other and causing the water source to be discharged directly through the external discharge channel 18.

[0054] The other structures and effects of the bottle blowing machine described in this embodiment are consistent with those in the first embodiment and will not be described in detail.

Claims

1. A PET bottle blowing machine, comprising a frame (1) and a bottle blowing mechanism (2) and a conveying mechanism (3) arranged on the frame (1), wherein the bottle blowing mechanism (2) comprises a mold assembly and a bottle making assembly, wherein the mold assembly comprises a template that can be opened and closed and a bottle blowing mold (4) arranged on the opposite surface of the template and can be closed to form a mold cavity, characterized in that: The bottle blowing mold (4) is provided with a heating system (5), and the bottle making assembly comprises a stretching rod (16) which is vertically telescopically arranged on the frame (1) and an air channel (6) and a water channel (7) which can be connected with the bottle blank in the mold cavity. The heating system (5) generates heat and increases the temperature of the mold cavity wall. The bottle blank in the mold cavity is first blown into a bottle body by the high-pressure airflow from the air channel (6). After the bottle body is heated by contact with the mold cavity wall, it is filled and cooled by the high-pressure water source from the water channel (7), so that the bottle body completes the quenching operation.

2. A PET bottle blowing machine according to claim 1, characterized in that: The bottle making assembly comprises a common channel (8), the inner port of which is connected to the bottle blank in the mold cavity, and the outer port of which can be switchedly connected to the air channel (6) and the water channel (7).

3. A PET bottle blowing machine according to claim 2, characterized in that: The conveying mechanism (3) comprises a sealing member (9) whose top can be inserted into the mouth of the bottle blank and a driving member for driving the sealing member (9) to drive the bottle blank to move. The bottle making assembly comprises a connecting seat (10) fixedly connected to the frame (1) and a three-way pipe fitting (11) arranged on the connecting seat (10). The three-way pipe fitting (11) comprises a mixing outlet connected to the common channel (8) and an air channel inlet and a water channel inlet respectively connected to the air channel (6) and the water channel (7). A one-way valve (12) is arranged at the air channel inlet.

4. A PET bottle blowing machine according to claim 3, characterized in that: The connecting seat (10) is provided with a vertically penetrating lower through hole, and the sealing member (9) is provided with a vertically penetrating upper through hole (13). When the sealing member (9) is matched and connected with the connecting seat (10), the upper through hole (13) and the lower through hole are vertically aligned to form a lifting channel for the stretching rod (16) to be lifted and lowered. The stretching rod (16) passes through the lifting channel from bottom to top and is inserted into the bottle blank, so that the bottle blank is blown into a bottle body by the blowing assembly.

5. A PET bottle blowing machine according to claim 4, characterized in that: The lower through hole comprises a large diameter section (14) and a small diameter section (15) which are arranged in an upper and lower manner. The side wall of the large diameter section (14) is connected to a three-way pipe (11) via a side pipe (17). The side pipe (17), the lower through hole and the upper through hole (13) are sequentially connected in series to form the common channel (8).

6. A PET bottle blowing machine according to claim 5, characterized in that: The diameter of the small diameter section (15) matches the diameter of the stretching rod (16) to eliminate the gap between the inner wall of the small diameter section (15) and the outer wall of the stretching rod (16); or, the diameters of the large diameter section (14) and the upper through hole (13) are both larger than the diameter of the stretching rod (16), so that a local section of the common channel (8) is formed between the inner wall of the large diameter section (14) and the outer wall of the stretching rod (16), and between the inner wall of the upper through hole (13) and the outer wall of the stretching rod (16).

7. A PET bottle blowing machine according to claim 2, characterized in that: The common channel (8) is opened along the axial direction of the stretching rod (16), and the inner port of the common channel (8) is arranged on the middle section of the stretching rod (16); or, a heat insulation layer is provided between the template and the bottle blowing mold to limit the heat on the bottle blowing mold from diffusing outward through the template.

8. A PET bottle blowing machine according to any one of claims 1 to 7, characterized in that: The stretching rod (16) is provided with an axially penetrating external discharge channel (18), the inlet of which is opened on the top of the stretching rod (16), and a pressure retaining valve (19) is provided on the external discharge channel (18). Water in the water channel (7) is input into the bottle body and the high-pressure airflow in the bottle body is driven to be discharged through the external discharge channel (18), so that the bottle body is filled with water and evenly cooled.

9. A PET bottle blowing machine according to claim 8, characterized in that: The pressure in the water channel (7) is greater than the opening pressure threshold of the pressure-maintaining valve (19), and the opening pressure threshold of the pressure-maintaining valve (19) is greater than the high-pressure airflow pressure in the air channel (6).

10. A PET bottle blowing machine according to any one of claims 1 to 7, characterized in that: The frame (1) is provided with a bottle-removing mechanism, which comprises a mechanical arm for driving the preform to be separated from the sealing member (9) and a water collecting tank (20) arranged at the bottom of the frame (1); the sealing member (9) drives the bottle body to be transferred from the mold assembly to the bottle-removing mechanism, and the water in the bottle body falls into the water collecting tank (20); the water in the water collecting tank (20) flows back to the water storage tank through the recovery pipe (21) and is reused after cooling; or, the heating system (5) comprises an electric heating rod inserted in the bottle blowing mold (4) and a temperature controller for controlling the operation of the electric heating rod, so that the temperature of the inner wall of the mold cavity can be controlled.

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