A bottle preform conveying mechanism for a full-rotation blow-filling-integrated machine

Abstract

The application discloses a bottle blank conveying mechanism for a full-rotation injection-blowing integrated machine, which comprises a rack, a rotating base, a transition hub, an injection unit and a clamping unit. The injection unit comprises an injection support, an injection lower die and an injection upper die. The injection upper die comprises a cylindrical outer die, at least two inner die petals arranged in the outer die in a circumferential direction, at least two first elastic members correspondingly connected between the outer die and the inner die petals, and an air inlet hole arranged on the outer die. The inner die petals are used to move inward to stretch the first elastic members when air is introduced into the air inlet hole, and the inner die petals are used to move outward to abut against the outer die when air is cut off in the air inlet hole. The clamping unit is arranged on the transition hub in a lifting manner, and is used to clamp the bottle blank in the injection upper die to pull the bottle blank downward away from the injection upper die before the bottle blank abuts against the inner die petals. The bottle blank conveying mechanism for the full-rotation injection-blowing integrated machine has relatively high conveying efficiency and can guarantee the production efficiency of a bottle blowing mechanism.

Description

Technical Field

[0001] This invention relates to the field of beverage packaging machinery, and in particular to a preform conveying mechanism for a fully rotary injection blow molding machine. Background Technology

[0002] Existing blow molding machines typically use preforms produced by horizontal injection molding machines or vertical disc injection molding machines. The preforms are then fed into a heating machine and a blow molding machine to be blown into shape.

[0003] For horizontal injection molding machines, the preforms produced are not convenient to be directly sorted and transported after molding. They need to be collected and transported in a centralized manner. This not only causes scratches on the surface of the preforms, leading to an increase in the defect rate, but also makes it impossible to transport the preforms in real time, affecting the continuous production of the blow molding machine.

[0004] Vertical disc injection molding machines not only suffer from low production capacity, but also from difficult demolding leading to low conveying efficiency, which in turn affects the production efficiency of blow molding machines. Summary of the Invention

[0005] The purpose of this invention is to provide a preform conveying mechanism for a fully rotary injection blow molding machine, which has relatively high conveying efficiency and can ensure the production efficiency of the blow molding mechanism.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A preform conveying mechanism for a fully rotary injection blow molding machine is used to convey preforms formed in the injection molding mechanism to the blow molding mechanism. The preform conveying mechanism includes a frame, a rotating seat and a transition hub that are rotatable about their own axes on the frame, a plurality of injection molding units arranged at intervals along the circumferential direction on the rotating seat, and a plurality of clamping units arranged at intervals along the circumferential direction on the transition hub.

[0008] The injection unit includes an injection support mounted on the rotating seat, a lower injection mold mounted on the injection support or the rotating seat, and an upper injection mold mounted on the injection support and located above the lower injection mold.

[0009] The injection molding upper mold includes a cylindrical outer mold and at least two inner mold segments arranged in the outer mold along the circumferential direction. The injection molding upper mold also includes at least two first elastic members connected one-to-one between the outer mold and the inner mold segments, and an air inlet hole opened on the outer mold. The inner mold segments are used to move inward to stretch the first elastic members when air is introduced through the air inlet hole, so that the outer circumferential surface of the inner mold segment is spaced apart from the inner circumferential surface of the outer mold. The inner mold segments are also used to move outward to abut against the outer mold when air is cut off through the air inlet hole.

[0010] The clamping unit is vertically mounted on the transition hub and is used to clamp the preform in the upper injection mold to pull the preform downward away from the upper injection mold before it abuts against the inner mold flap.

[0011] Preferably, the inner mold flap has an initial position and an injection position, and the inner mold flap is used to switch from the initial position to the injection position when air is introduced through the air inlet;

[0012] When the inner mold lobe is in the initial position, at least two inner mold lobes are spaced apart from each other.

[0013] When the inner mold flap is in the injection position, at least two inner mold flaps abut against each other in the circumferential direction and surround each other to form a cylindrical inner mold.

[0014] Preferably, the inner mold flap includes a first arcuate inner surface and a second arcuate inner surface, the radius of the first arcuate inner surface is smaller than the radius of the second arcuate inner surface, and the first arcuate inner surface is located above the second arcuate inner surface.

[0015] Preferably, the first elastic element is a tension spring, the elastic extension direction of which is parallel to the arrangement direction of the inner mold flap and the outer mold, and perpendicular to the lifting direction of the upper injection mold.

[0016] Preferably, in either the outer mold or the inner mold lobe, the upper injection mold further includes a guide groove provided on one of them and a guide member provided on the other for extending into the guide groove.

[0017] Preferably, the preform conveying mechanism further includes a first lifting cam disposed on the frame, and the injection molding unit further includes a first roller disposed on the outside of the upper injection mold that is rotatable about its own axis, the first roller being used to abut against the upper surface of the first lifting cam through its outer circumferential surface.

[0018] Preferably, the injection molding unit further includes a second elastic element at its upper and lower ends for connecting the upper injection mold and the lower injection mold, respectively. The second elastic element is used to provide an elastic restoring force that pulls the upper injection mold downward to press the first roller against the first lifting cam.

[0019] Preferably, the clamping unit includes a linear guide rail that is vertically mounted on the transition hub, a transition manipulator mounted on the linear guide rail, a second roller that is rotatable about its own axis and mounted on the linear guide rail or the transition manipulator, and a second lifting cam mounted on the frame. The second roller is used to abut against the upper surface of the second lifting cam through its outer circumferential surface.

[0020] More preferably, the transition hub is provided with a plurality of limiting members that are correspondingly positioned above the linear guide rail.

[0021] More preferably, the upper injection mold is provided with a cooler for cooling the part of the preform held by the transition robot, and the outer side of the transition hub is provided with a heat spreader for heating the preform to make its temperature uniform throughout, and the transition robot is used to hold the preform when it rises to the highest point.

[0022] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The preform conveying mechanism of the present invention for a fully rotary injection blow molding machine has the following advantages:

[0023] The preform is formed between the upper injection mold and the lower injection mold. After injection molding, the preform can be removed by raising the upper injection mold. Since the mold opening direction is upward, more injection units can be arranged on the rotating seat of the same radius, resulting in relatively high production efficiency and capacity.

[0024] By setting the specific structure of the injection mold, air is introduced through the air inlet during injection, driving several inner mold segments to move closer together to form the injection cavity. After injection, the air inlet is cut off, and the inner mold segments move outward away from the preform under the action of the first elastic element. This not only enables smooth demolding of the upper part of the preform, but also allows for spacing between the upper part of the preform and the inner mold segments. This allows the clamping unit to pull the preform downward away from the injection mold before it comes into contact with the inner mold segments during the relative rotation of the rotating seat and the transition hub. This enables the clamping unit to smoothly remove the preform, resulting in relatively high conveying efficiency, which in turn ensures the production efficiency of the downstream blow molding mechanism. Attached Figure Description

[0025] Appendix Figure 1 This is a schematic diagram of the structure of a fully rotary injection-blowing machine according to a specific embodiment of the present invention;

[0026] Appendix Figure 2 For the appendix Figure 1 Enlarged structural diagram of the middle injection molding unit;

[0027] Appendix Figure 3 This is an enlarged cross-sectional view of the upper injection mold (with the inner mold flap in the injection position);

[0028] Appendix Figure 4 This is an enlarged cross-sectional view of the upper and lower injection molds after they are closed.

[0029] Appendix Figure 5 This is an enlarged schematic diagram of the connection structure between the transition hub and the clamping unit.

[0030] Among them: 1. Rack;

[0031] 2. Injection molding mechanism; 21. Rotating seat; 22. Injection molding unit; 23. Extrusion mechanism; 24. Conveying pipe; 25. First lifting cam; 26. Hopper;

[0032] 221. Injection support; 222. Lower injection mold; 223. Upper injection mold; 2231. Outer mold; 22311. Groove; 2232. Inner mold piece; 22321. First arc-shaped inner surface; 22322. Second arc-shaped inner surface; 2233. First elastic element; 2234. Air inlet; 2235. Guide groove; 2236. Guide element; 2237. First hook; 2238. Second hook; 224. Lifting rod; 225. First roller; 226. Second elastic element;

[0033] 3. Blow molding mechanism; 31. Blow molding turntable; 32. Blow molding die holder;

[0034] 4. Transition hub; 5. Clamping unit; 51. Linear guide rail; 52. Transition manipulator; 53. Second roller; 54. Second lifting cam; 55. Limiting component;

[0035] 6. Billet-receiving hub; 7. Billet-receiving robot; 8. Heat exchanger; 9. Bottle-discharging hub; 10. Bottle-discharging robot. Detailed Implementation

[0036] The technical solution of the present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0037] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0038] In the description of the embodiments of the present invention, it should be understood that the terms "length", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0041] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] The following disclosure provides many different implementations or examples for carrying out different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0043] See Figure 1 As shown, this embodiment provides a preform conveying mechanism for a fully rotary injection blow molding machine, used to convey the preforms formed in the injection molding mechanism 2 to the blow molding mechanism 3. The preform conveying mechanism includes a frame 1, a rotating seat 21 and a transition hub 4 that are rotatable about their own axes on the frame 1, a plurality of injection molding units 22 arranged sequentially and spaced apart along the circumferential direction on the rotating seat 21, and a plurality of clamping units 5 arranged sequentially and spaced apart along the circumferential direction on the transition hub 4.

[0044] In this embodiment, a preform picking hub 6 is also provided between the blow molding mechanism 3 and the transition hub 4. A preform picking robot 7 is provided on the preform picking hub 6, which is used to pick up preforms from the clamping unit 5 of the transition hub 4 and feed them into the blow molding mechanism 3. The blow molding mechanism 3 includes a blow molding turntable 31 and blow molding mold frames 32 disposed on the blow molding turntable 31. Multiple blow molding mold frames 32 are arranged evenly at intervals along the circumferential direction on the blow molding turntable 31. An exit hub 9 is also provided on the outer side of the blow molding mechanism 3, and an exit robot 10 is provided on the exit hub 9, which is used to pick up containers blown into shape in the blow molding mold frames 32. The preform picking hub 6, the blow molding turntable 31, and the exit hub 9 are each rotatably mounted on the frame 1 around their own axis.

[0045] The injection molding mechanism 2 includes a rotating seat 21, an injection molding unit 22, an extrusion mechanism 23 disposed on the rotating seat 21 for storing injection molding plastic, a hopper 26 connected above the extrusion mechanism 23, and multiple delivery pipes 24 disposed one-to-one between the extrusion mechanism 23 and the injection molding unit 22.

[0046] See Figure 2 As shown, the injection unit 22 includes an injection support 221 disposed on the rotating seat 21, a lower injection mold 222 disposed on the injection support 221 or the rotating seat 21 (in this embodiment, the lower injection mold 222 is located outside the injection support 221 and connected to the rotating seat 21), and an upper injection mold 223 disposed on the injection support 221 and located directly above the lower injection mold 222. The injection mechanism 2 also includes a lifting rod 224 disposed on the injection support 221.

[0047] See Figure 4 As shown, the lifting rod 224 is located directly above the upper injection mold 223. The upper injection mold 223 and the lower injection mold 222 each have an upper through hole and a lower through hole for the lifting rod 224 to pass through. After the upper injection mold 223 and the lower injection mold 222 are closed, they form an injection mold cavity. After the lifting rod 224 is inserted into this injection mold cavity, there is a gap between them for injecting the injection plastic; this gap is shaped like the preform.

[0048] See Figure 3As shown, the injection molding upper mold 223 includes a cylindrical outer mold 2231 and at least two inner mold segments 2232 arranged in the outer mold 2231 and along the circumferential direction. The injection molding upper mold 223 also includes at least two first elastic members 2233 connected one-to-one between the outer mold 2231 and the inner mold segments 2232, and an air inlet 2234 opened on the outer mold 2231. The air inlet 2234 communicates with the gap between the outer mold 2231 and the inner mold segments 2232. The inner mold segments 2232 are used to move inward to stretch the first elastic members 2233 when air is introduced through the air inlet 2234, thereby making the outer circumferential surface of the inner mold segment 2232 and the inner circumferential surface of the outer mold 2231 spaced apart. The inner mold segments 2232 are also used to move outward under the action of the first elastic members 2233 to abut against the outer mold 2231 when the air is cut off through the air inlet 2234. In this embodiment, the outer mold 2231 is provided with a groove 22311, and the first elastic member 2233 is located in the groove 22311.

[0049] Of the outer mold 2231 and the inner mold segment 2232, the injection molding upper mold 223 further includes a guide groove 2235 on one of them and a guide member 2236 on the other for extending into the guide groove 2235. In this embodiment, the guide groove 2235 is recessed outward on the inner circumferential surface of the outer mold 2231, while the guide member 2236 protrudes outward on the outer circumferential surface of the inner mold segment 2232. Each inner mold segment 2232 has two guide members 2236 symmetrically arranged along the vertical direction, located on the upper and lower sides of the corresponding first elastic member 2233, respectively, to ensure the stability of the inner mold segment 2232 relative to the outer mold 2231, thereby preventing damage to the preform after injection molding. In this embodiment, the air inlet 2234 communicates with the guide groove 2235 from inside the outer mold 2231.

[0050] See Figure 3 As shown, the inner mold flap 2232 includes a first arc-shaped inner surface 22321 and a second arc-shaped inner surface 22322. The radius of the first arc-shaped inner surface 22321 is smaller than the radius of the second arc-shaped inner surface 22322, and the first arc-shaped inner surface 22321 is located above the second arc-shaped inner surface 22322. During mold closing, the first arc-shaped inner surface 22321 is used to abut against the inserted lifting rod 224, and an annular gap for injecting injection plastic is formed between the second arc-shaped inner surface 22322 and the lifting rod 224.

[0051] In this embodiment, the first elastic element 2233 is a tension spring. The elastic extension and contraction direction of the tension spring is parallel to the arrangement direction of the inner mold piece 2232 and the outer mold 2231, and perpendicular to the lifting direction of the upper injection mold 223. The length direction of the tension spring is also parallel to the radial direction of the upper injection mold 223. The outer mold 2231 is provided with a first hook 2237, and the inner mold piece 2232 is provided with a second hook 2238. The tension spring is hooked onto the first hook 2237 and the second hook 2238 at its two ends, respectively.

[0052] The inner mold flap 2232 has an initial position and an injection position. The inner mold flap 2232 is used to switch from the initial position to the injection position when air is introduced through the air inlet 2234, at which time the first elastic element 2233 is stretched. The inner mold flap 2232 is also used to switch from the injection position to the initial position when air intake through the air inlet 2234 stops. The elastic restoring force for the inner mold flap 2232 to reset is provided by the first elastic element 2233. This configuration allows for quick demolding of the preform's opening after injection molding, enabling the clamping unit 5 on the transition hub 4 to smoothly remove the preform. This results in relatively high conveying efficiency, thereby ensuring the production efficiency of the blow molding mechanism 3.

[0053] When the inner mold piece 2232 is in the initial position, at least two inner mold pieces 2232 are spaced apart. Under the action of the first elastic member 2233, the guide member 2236 on the inner mold piece 2232 is inserted into the guide groove 2235 on the outer mold 2231, so that the inner mold piece 2232 switches from the injection position to the initial position. At this time, the inner mold piece 2232 abuts against the outer mold 2231, that is, the outer peripheral surface of the inner mold piece 2232 is pressed against the inner peripheral surface of the outer mold 2231.

[0054] When the inner mold piece 2232 is in the injection position, at least two inner mold pieces 2232 abut against each other and enclose each other in the circumferential direction to form a cylindrical inner mold. Under the action of gas pressure, the guide piece 2236 on the inner mold piece 2232 moves inward relative to the guide groove 2235 on the outer mold 2231, so that the inner mold piece 2232 switches from the initial position to the injection position. At this time, the inner mold piece 2232 moves inward away from the outer mold 2231, that is, the outer circumferential surface of the inner mold piece 2232 and the inner circumferential surface of the outer mold 2231 are spaced apart.

[0055] See Figure 1 As shown, the preform conveying mechanism also includes a first lifting cam 25 disposed on the frame 1. In this embodiment, the first lifting cam 25 is arranged around the outside of the injection molding unit 22. The injection molding unit 22 also includes a first roller 225 disposed on the outside of the upper injection mold 223, which is rotatable about its own axis. The first roller 225 is used to abut against the upper surface of the first lifting cam 25 through its outer circumferential surface. The axis of the first roller 225 is parallel to the radial direction of the rotating seat 21.

[0056] The injection molding unit 22 also includes a second elastic element 226 at its upper and lower ends for connecting the upper injection mold 223 and the lower injection mold 222 respectively. The second elastic element 226 is used to provide an elastic restoring force to pull the upper injection mold 223 downward to press the first roller 225 against the first lifting cam 25.

[0057] The aforementioned clamping unit 5 is movably mounted on the transition hub 4. The clamping unit 5 is used to clamp the preform in the upper injection mold 223 so as to pull the preform downward away from the upper injection mold 223 before it abuts against the inner mold flap 2232.

[0058] See Figure 5 As shown, the clamping unit 5 includes a linear guide rail 51 that is vertically mounted on the transition hub 4, a transition manipulator 52 mounted on the linear guide rail 51, a second roller 53 that is rotatable about its own axis and mounted on the linear guide rail 51 or the transition manipulator 52, and a second lifting cam 54 mounted on the frame 1. The second roller 53 abuts against the upper surface of the second lifting cam 54 through its outer circumferential surface. With this arrangement, the transition manipulator 52 can move up and down relative to the transition hub 4 as the transition hub 4 rotates with the clamping unit 5. To prevent the linear guide rail 51 from detaching upward from the transition hub 4, a plurality of limiting members 55 are provided on the transition hub 4, corresponding one-to-one with those above the linear guide rail 51.

[0059] In this embodiment, the upper injection mold 223 is equipped with a cooler (not shown in the figure) for cooling the preform held by the transition robot 52 to prevent deformation of the preform. A heat spreader 8 is provided on the outer side of the transition hub 4 to heat the preform and ensure uniform temperature throughout. In this embodiment, the heat spreader 8 has a double-layered arc-shaped structure, located between the inner and outer layers when the preform is conveyed outside the transition hub 4. This design not only fully utilizes the residual heat after injection molding of the preform, reducing the energy consumption of the blow molding mechanism 3, but also ensures the quality of the blow molding process.

[0060] In this embodiment, the transition manipulator 52 is used to grip the preform when it rises to its highest point, that is, to grip the highest point of the preform exposed above the upper injection mold 223. Since the temperature at this exposed point of the preform is relatively low, it can better prevent deformation during gripping.

[0061] The working process of this embodiment is described in detail below:

[0062] During operation, the injection plastic is injected into the extrusion mechanism 23 through the hopper 26. Under the action of the intensifier in the extrusion mechanism 23, the injection plastic enters the delivery pipe 24 and is then fed into the injection mold 222, while maintaining air supply to the air inlet 2234.

[0063] The rotating seat 21 rotates around its axis. During the revolution of the injection support 221, the first roller 225 first abuts against the descending section of the first lifting cam 25. Under the weight of the upper injection mold 223 itself and the cooperation of the second elastic element 226, the upper injection mold 223 is driven to move downward until it abuts against the lower injection mold 222 and closes. At the same time, the lifting rod 224 descends into the upper injection mold 223 and the lower injection mold 222 under the drive of the drive motor.

[0064] The rotating seat 21 continues to rotate around its axis. The lifting rod 224 rises under the drive of the drive motor and disengages from the lower injection mold 222 and the upper injection mold 223 in sequence. During the revolution of the injection support 221, the first roller 225 abuts against the rising section of the first lifting cam 25, causing the upper injection mold 223 to rise under the drive of the first lifting cam 25 until the bottom of the preform is disengaged from the lower injection mold 222.

[0065] During the revolution of the transition manipulator 52, the second roller 53 abuts against the rising section of the second lifting cam 54 until the transition manipulator 52 rises to the highest point. At this time, the transition manipulator 52 is closest to the upper injection mold 223 that has just separated from the lower injection mold 222. The bottle preform is held by the transition manipulator 52, and the air inlet is cut off, so that the upper part of the bottle preform is laterally separated from the upper injection mold 223.

[0066] At this time, the transition robot 52 and the upper injection mold 223 continue to revolve. The second roller 53 abuts against the descending section of the second lifting cam 54, causing the transition robot 52 to pull the preform downward from the upper injection mold 223. At this time, the preform and the inner mold piece 2232 are spaced apart. During the process of the transition robot 52 pulling the preform downward, the gap between the preform and the inner mold piece 2232 gradually decreases. The transition robot 52 is used to pull the preform downward from the upper injection mold 223 before it touches the inner mold piece 2232, so as to smoothly remove the molded preform from the upper injection mold 223.

[0067] After the transition robot 52 continues to rotate through a certain angle, it hands the preform over to the preform picking robot 7. The preform picking robot 7 then sends the preform into the blow molding die 32. During the rotation of the blow molding turntable 31, the preform is blown into shape using the residual heat of the injection molding process. Then, the blown container is taken out of the blow molding die 32 by the bottle ejection robot 10.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A preform conveying mechanism for a fully rotary injection blow molding machine, used to convey preforms injection-molded in the injection molding mechanism to the blow molding mechanism, characterized in that: The preform conveying mechanism includes a frame, a rotating seat and a transition hub that are rotatable on the frame and can rotate around their own axis, a plurality of injection molding units that are arranged at intervals along the circumferential direction on the rotating seat, and a plurality of clamping units that are arranged at intervals along the circumferential direction on the transition hub. The injection unit includes an injection support mounted on the rotating seat, a lower injection mold mounted on the injection support or the rotating seat, and an upper injection mold mounted on the injection support and located above the lower injection mold. The injection molding upper mold includes a cylindrical outer mold and at least two inner mold segments arranged in the outer mold along the circumferential direction. The injection molding upper mold also includes at least two first elastic members connected one-to-one between the outer mold and the inner mold segments, and an air inlet hole opened on the outer mold. The inner mold segments are used to move inward to stretch the first elastic members when air is introduced through the air inlet hole, so that the outer circumferential surface of the inner mold segment is spaced apart from the inner circumferential surface of the outer mold. The inner mold segments are also used to move outward to abut against the outer mold when air is cut off through the air inlet hole. The clamping unit is vertically mounted on the transition hub and is used to clamp the preform in the upper injection mold to pull the preform downward away from the upper injection mold before it abuts against the inner mold flap.

2. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 1, characterized in that: The inner mold flap has an initial position and an injection position, and the inner mold flap is used to switch from the initial position to the injection position when air is introduced through the air inlet; When the inner mold lobe is in the initial position, at least two inner mold lobes are spaced apart from each other. When the inner mold flap is in the injection position, at least two inner mold flaps abut against each other in the circumferential direction and surround each other to form a cylindrical inner mold.

3. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 1, characterized in that: The inner mold flap includes a first arc-shaped inner surface and a second arc-shaped inner surface, the radius of the first arc-shaped inner surface is smaller than the radius of the second arc-shaped inner surface, and the first arc-shaped inner surface is located above the second arc-shaped inner surface.

4. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 1, characterized in that: The first elastic element is a tension spring, and the elastic extension and contraction direction of the tension spring is parallel to the arrangement direction of the inner mold flap and the outer mold, and perpendicular to the lifting and lowering direction of the injection upper mold.

5. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 1, characterized in that: Of the outer mold and the inner mold lobe, the upper injection mold further includes a guide groove provided on one of them and a guide member provided on the other for extending into the guide groove.

6. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 1, characterized in that: The preform conveying mechanism further includes a first lifting cam mounted on the frame, and the injection molding unit further includes a first roller rotatable about its own axis and mounted on the outside of the upper injection mold. The first roller is used to abut against the upper surface of the first lifting cam through its outer circumferential surface.

7. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 6, characterized in that: The injection molding unit further includes a second elastic element at its upper and lower ends for connecting the upper injection mold and the lower injection mold, respectively. The second elastic element is used to provide an elastic restoring force that pulls the upper injection mold downward to press the first roller against the first lifting cam.

8. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 1, characterized in that: The clamping unit includes a linear guide rail that is vertically mounted on the transition hub, a transition manipulator mounted on the linear guide rail, a second roller that is rotatable about its own axis and mounted on the linear guide rail or the transition manipulator, and a second lifting cam mounted on the frame. The second roller is used to abut against the upper surface of the second lifting cam through its outer circumferential surface.

9. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 8, characterized in that: The transition hub is provided with a plurality of limiting members that are correspondingly positioned above the linear guide rail.

10. The preform conveying mechanism for a fully rotary injection blow molding machine according to claim 8, characterized in that: The upper injection mold is provided with a cooler for cooling the part of the preform held by the transition robot, and the outer side of the transition hub is provided with a heat spreader for heating the preform to make its temperature uniform throughout. The transition robot is used to hold the preform when it rises to the highest point.

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