Rotary injection molding machine for container preparation

Abstract

The invention discloses a rotary injection molding machine for container preparation. The rotary injection molding machine comprises a rack, a rotating seat, an injection molding unit, an extrusion mechanism and a conveying pipe, the injection molding unit comprises an injection molding support arranged on the rotating seat, a lower injection molding die, an upper injection molding die and a lifting rod, and an upper through hole and a lower through hole for the lifting rod to penetrate in and out are formed in the upper injection molding die and the lower injection molding die respectively; the upper injection mold comprises an outer mold and at least two inner mold petals arranged in the outer mold and arranged in the circumferential direction, the upper injection mold further comprises at least two first elastic pieces connected between the outer mold and the inner mold petals in a one-to-one correspondence mode and air inlet holes formed in the outer mold, and the inner mold petals are used for moving inwards to stretch the first elastic pieces when air enters the air inlet holes. And the inner mold petals are further used for moving outwards to abut against the outer mold when air in the air inlet holes is cut off. According to the rotary injection molding machine for container preparation, the productivity and the conveying efficiency are relatively high, and the production efficiency of the next procedure can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, in particular to a rotary injection molding machine for preparing containers. Background Art

[0002] The container blanks used in existing bottle blowing machines are generally produced by horizontal injection molding machines or vertical disc injection molding machines.

[0003] For horizontal injection molding machines, it is not convenient to sort and transport the container blanks produced by them directly after molding. They need to be collected and then transported. Real-time transportation cannot be achieved, which will affect the continuous production of subsequent processes.

[0004] For vertical disc injection molding machines, there is not only the problem of low production capacity, but also the problem of difficulty in demoulding, which makes it difficult to hand over to the subsequent process and thus leads to low transportation efficiency, which will also affect the production efficiency of the subsequent process. Summary of the Invention

[0005] The object of the present invention is to provide a rotary injection molding machine for container preparation, which has relatively high production capacity and conveying efficiency and can ensure the production efficiency of subsequent processes.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A rotary injection molding machine for preparing containers, comprising a frame, a rotating base rotatable about its own axis on the frame, a plurality of injection units arranged on the rotating base in a circumferential direction and spaced apart from each other, an extrusion mechanism disposed on the rotating base and used to store injection-molded plastic, and a plurality of delivery pipes correspondingly disposed between the extrusion mechanism and the injection units.

[0008] The injection molding unit includes an injection molding support provided on the rotating seat, an injection molding lower mold provided on the injection molding support or the rotating seat, an injection molding upper mold provided on the injection molding support and located above the injection molding lower mold in a liftable manner, and a lifting rod provided on the injection molding support in a liftable manner, wherein an upper through hole and a lower through hole for the lifting rod to pass through are respectively formed in the injection molding upper mold and the injection molding lower mold;

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

[0010] Preferably, the inner mold halves have an initial position and an injection position, and the inner mold halves are used to switch from the initial position to the injection position when air is admitted through the air inlet hole;

[0011] When the inner mold halves are in the initial position, at least two of the inner mold halves are spaced apart from each other;

[0012] When the inner mold halves are in the injection molding position, at least two inner mold halves abut against each other in sequence along the circumferential direction and enclose each other to form a cylindrical inner mold.

[0013] Preferably, the inner mold half 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.

[0014] Preferably, the first elastic member is a tension spring, and the elastic expansion and contraction direction of the tension spring is parallel to the arrangement direction of the inner mold halves and the outer mold, and perpendicular to the lifting direction of the injection upper mold.

[0015] Preferably, in both the outer mold and the inner mold halves, the injection upper mold further includes a guide groove provided on one of them, and a guide member provided on the other one and used to extend into the guide groove.

[0016] Preferably, the rotary injection molding machine further includes a lifting cam provided on the frame, and the injection unit further includes a roller rotatable around its own axis and provided on the outside of the injection upper mold, and the roller is used to abut the upper surface of the lifting cam through its outer circumferential surface.

[0017] More preferably, the injection unit further includes a second elastic member at an upper and lower end for connecting the injection upper mold and the injection lower mold respectively, and the second elastic member is used to provide an elastic restoring force for pulling the injection upper mold downward to press the roller against the lifting cam.

[0018] Preferably, the injection molding unit further comprises a melt dispensing mechanism provided on the injection molding support and sleeved on the outside of the delivery pipe, and the delivery pipe is used to sequentially pass through the melt dispensing mechanism and the injection molding support.

[0019] Preferably, the injection molding unit further includes a linear guide rail provided on the injection molding support, a slider which can be raised and lowered on the linear guide rail, and a driving mechanism provided on the injection molding support and used to drive the slider to slide, the lifting rod is connected to the slider, and the injection molding upper mold can be raised and lowered on the linear guide rail.

[0020] More preferably, the driving mechanism includes a driving motor provided on the injection molding support, a screw having one end connected to an output end of the driving motor via a coupling, and a nut sleeved on the screw and connected to the slider.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the rotary injection molding machine for container preparation of the present invention has the following advantages:

[0022] The extrusion mechanism for storing injection-molded plastic is arranged on the rotating seat. During the rotation and transfer process of the rotating seat, the container is injection-molded and solidified, and the production efficiency and capacity are relatively high.

[0023] The container is formed between the upper injection mold and the lower injection mold. After injection molding, the upper injection mold and the lifting rod are lifted upward to remove the container. Since the mold opening direction is upward, more injection molding units can be arranged on the rotating base with the same radius, which can further improve production efficiency and capacity.

[0024] By setting up the specific structure of the injection molding upper mold, air is introduced through the air inlet during injection molding, driving several inner mold pieces to move closer to each other to clamp the lifting rod. After the injection molding is completed, the air inlet is cut off, and the inner mold pieces are moved outward away from the injection-molded container under the action of the first elastic member, completing the demoulding of the upper part of the container, so that the clamping mechanism in the subsequent process can smoothly remove the container, the conveying efficiency is relatively high, and thus the production efficiency of the subsequent process can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attachment Figure 1 Schematic diagram of the structure of a rotary injection molding machine according to a specific embodiment of the present invention;

[0026] Attachment Figure 2 For attachment Figure 1 Schematic diagram of the connection structure between the extrusion mechanism and the conveying pipe;

[0027] Attachment Figure 3 For attachment Figure 1 A schematic diagram of the enlarged structure of the injection molding unit;

[0028] Attachment Figure 4 It is an enlarged schematic diagram of the cross-sectional structure of the injection upper mold and the injection lower mold after the mold is closed;

[0029] Attachment Figure 5 This is an enlarged schematic diagram of the cross-sectional structure of the injection mold (the inner mold half is in the injection position).

[0030] Among them: 1. Frame; 2. Rotating seat; 3. Injection molding unit; 31. Injection molding support; 32. Injection molding lower mold; 33. Injection molding upper mold; 331. Outer mold; 3311. Groove; 332. Inner mold flap; 3321. First arc-shaped inner surface; 3322. Second arc-shaped inner surface; 333. First elastic member; 334. Air inlet; 335. Guide groove; 336. Guide member; 337. First hook; 338. Second hook; 34. Lifting rod; 35. Roller; 36. Second elastic member; 37. Melt dispensing mechanism; 38. Linear guide rail; 39. Slider; 310. Driving mechanism; 3101. Driving motor; 3102. Screw; 3103. Nut; 311. Mounting block; 312. Control valve; 4. Extrusion mechanism; 5. Delivery pipe; 6. Lifting cam; 7. Hopper. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be further described below in conjunction with specific embodiments and drawings.

[0032] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0033] In the description of the embodiments of the present invention, it should be understood that the terms "length", "inside", etc. indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0036] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0038] See also Figure 1 As shown, this embodiment provides a rotary injection molding machine for container preparation, including a frame 1, a rotating base 2 rotatable around its own axis on the frame 1, a plurality of injection units 3 arranged on the rotating base 2 in a circumferential direction, an extrusion mechanism 4 provided on the rotating base 2 and used for storing injection-molded plastic, and a plurality of conveying pipes 5 provided one-to-one between the extrusion mechanism 4 and the injection unit 3.

[0039] In this embodiment, the extrusion mechanism 4 is cylindrical and is arranged inside the surrounding of the multiple injection units 3. Figure 2As shown, a hopper 7 is connected above the extrusion mechanism 4 for feeding the injection-molded plastic into the extrusion mechanism 4 through the hopper 7. A circle of delivery pipes 5 are evenly spaced and arranged below and outside the extrusion mechanism 4. The extrusion mechanism 4 is equipped with a supercharger (not shown) for smoothly injecting the injection-molded plastic into the delivery pipes 5. The delivery pipes 5 have a heating function to prevent the injection-molded plastic from solidifying therein.

[0040] See also Figure 3 As shown, the injection unit 3 includes an injection molding support 31 provided on the rotating base 2, an injection molding lower mold 32 provided on the injection molding support 31 or the rotating base 2 (in this embodiment, the injection molding lower mold 32 is located outside the injection molding support 31 and connected to the rotating base 2), an injection molding upper mold 33 which is liftably provided on the injection molding support 31 and located directly above the injection molding lower mold 32, and a lifting rod 34 which is liftably provided on the injection molding support 31.

[0041] The injection unit 3 further includes a melt dispensing mechanism 37 mounted on the injection molding support 31 and sleeved outside the delivery tube 5. This melt dispensing mechanism 37 is used to heat the injection molding plastic in the delivery tube 5 into a melt. A control valve 312 is provided on the injection molding support 31 to control the flow of the delivery tube 5. In this embodiment, the delivery tube 5 is configured to sequentially pass through the melt dispensing mechanism 37 and the injection molding support 31 before communicating with the lower injection mold 32. In other embodiments, the delivery tube 5 may also communicate with the upper injection mold 33.

[0042] See also Figure 4 As shown, a lifting rod 34 is positioned directly above the upper injection mold 33. Upper and lower injection molds 33 and 32 are each provided with an upper through-hole and a lower through-hole, respectively, for the lifting rod 34 to pass through. When the upper and lower injection molds 33 and 32 are joined, they form an injection mold cavity. Inserting the lifting rod 34 into this cavity creates a gap between the two for injecting the plastic. This gap is shaped like the container. In this embodiment, the injection-molded container is a bottle preform, which is subsequently heated and blown into a bottle.

[0043] See also Figure 5As shown, the injection mold 33 includes a cylindrical outer mold 331, at least two inner mold halves 332 disposed within the outer mold 331 and arranged along a circumferential direction, at least two first elastic members 333 connected one-to-one between the outer mold 331 and the inner mold halves 332, and an air inlet 334 provided on the outer mold 331. The air inlet 334 communicates with the gap between the outer mold 331 and the inner mold halves 332. The inner mold halves 332 are configured to move inward when air is admitted through the air inlet 334 to stretch the first elastic members 333, thereby spacing the outer circumference of the inner mold halves 332 from the inner circumference of the outer mold 331. The inner mold halves 332 are further configured to move outward to abut the outer mold 331 when air is deactivated through the air inlet 334. In this embodiment, a groove 3311 is provided in the outer mold 331, and the first elastic members 333 are located within the groove 3311.

[0044] The injection mold 33 further includes a guide groove 335 on one of the outer mold 331 and a guide member 336 on the other, configured to extend into the guide groove 335. In this embodiment, the guide groove 335 is concavely disposed on the inner circumference of the outer mold 331, while the guide member 336 is convexly disposed on the outer circumference of the inner mold member 332. Each inner mold member 332 is symmetrically provided with two guide members 336 in the vertical direction. The two guide members 336 are located on the upper and lower sides of the corresponding first elastic member 333, respectively, to ensure the stability of the movement of the inner mold member 332 relative to the outer mold 331, thereby preventing damage to the injection-molded container. In this embodiment, the air inlet 334 communicates with the guide groove 335 from within the outer mold 331.

[0045] See also Figure 5 As shown, the inner mold half 332 includes a first curved inner surface 3321 and a second curved inner surface 3322. The radius of the first curved inner surface 3321 is smaller than that of the second curved inner surface 3322, and the first curved inner surface 3321 is located above the second curved inner surface 3322. When the mold is closed, the first curved inner surface 3321 is used to press against the inserted lifting pin 34, and an annular gap is formed between the second curved inner surface 3322 and the lifting pin 34 for injecting the injection molded plastic.

[0046] In this embodiment, the first elastic member 333 is a tension spring. The direction of elastic expansion and contraction of the tension spring is parallel to the arrangement of the inner mold halves 332 and the outer mold 331, and perpendicular to the direction of elevation of the upper injection mold 33. The length of the tension spring is also parallel to the radial direction of the upper injection mold 33. A first hook 337 is provided on the outer mold 331, and a second hook 338 is provided on the inner mold halves 332. The tension spring is hooked onto the first hook 337 and the second hook 338 at its ends.

[0047] The inner mold flap 332 has an initial position and an injection position. When air is introduced through the air inlet 334, the inner mold flap 332 is switched from the initial position to the injection position, at which point the first elastic member 333 is stretched. The inner mold flap 332 is also switched from the injection position to the initial position when air is no longer introduced through the air inlet 334. The elastic restoring force that resets the inner mold flap 332 is provided by the first elastic member 333. This arrangement allows for rapid demolding of the container's mouth after injection molding, allowing for smooth removal of the container by a clamping mechanism (not shown) in subsequent processes. This results in relatively high conveying efficiency, thereby ensuring production efficiency in subsequent processes.

[0048] When the inner mold halves 332 are in the initial position, at least two inner mold halves 332 are spaced apart from each other. Under the action of the first elastic member 333, the guide members 336 on the inner mold halves 332 are inserted as a whole into the guide grooves 335 on the outer mold 331, so that the inner mold halves 332 are switched from the injection position to the initial position. At this time, the inner mold halves 332 abut against the outer mold 331 outward, that is, the outer peripheral surface of the inner mold halves 332 abuts against the inner peripheral surface of the outer mold 331.

[0049] When the inner mold halves 332 are in the injection molding position, at least two inner mold halves 332 abut and enclose in sequence along the circumferential direction to form a cylindrical inner mold. Under the action of gas pressure, the guide members 336 on the inner mold halves 332 move inward relative to the guide grooves 335 on the outer mold 331, so that the inner mold halves 332 switch from the initial position to the injection molding position. At this time, the inner mold halves 332 move inward away from the outer mold 331, that is, the outer circumferential surface of the inner mold halves 332 and the inner circumferential surface of the outer mold 331 are spaced apart.

[0050] See also Figure 1 As shown, the rotary injection molding machine further comprises a lifting cam 6 provided on the frame 1. In this embodiment, the lifting cam 6 is arranged in a ring on the outside of the injection unit 3. The injection unit 3 further comprises a roller 35 rotatable around its own axis and arranged on the outside of the injection upper mold 33. The roller 35 is used to abut the upper surface of the lifting cam 6 through its outer circumferential surface, and the axis of the roller 35 is parallel to the radial direction of the rotating base 2.

[0051] The injection unit 3 further includes a second elastic member 36 for connecting the upper injection mold 33 and the lower injection mold 32 at the upper and lower ends respectively. The second elastic member 36 is used to provide an elastic restoring force for pulling the upper injection mold 33 downward to press the roller 35 against the lifting cam 6.

[0052] Through this setting, the lifting cam 6 not only guides the roller 35, but its ascending section also drives the roller 35 to drive the injection mold 33 to move upward to open the mold; its descending section is used to cooperate with the second elastic member 36 to drive the injection mold 33 to move downward to close the mold.

[0053] See also Figure 3As shown, the above-mentioned injection molding unit 3 also includes a linear guide rail 38 provided on the injection molding support 31, a slider 39 which can be raised and lowered on the linear guide rail 38, and a driving mechanism 310 which is provided on the injection molding support 31 and is used to drive the slider 39 to slide. The lifting rod 34 is connected to the slider 39, and the injection molding upper mold 33 can be raised and lowered on the linear guide rail 38. The injection molding upper mold 33 is located below the slider 39.

[0054] In this embodiment, the drive mechanism 310 includes a drive motor 3101 mounted on top of the injection molding support 31, a screw rod 3102 whose upper end is connected to the output end of the drive motor 3101 via a coupling, and a nut 3103 that is sleeved on the screw rod 3102 and connected to the slider 39. The injection molding unit 3 also includes a pair of mounting blocks 311 spaced apart vertically on the injection molding support 31. The screw rod 3102 is rotatably connected to the pair of mounting blocks 311 at its upper and lower ends. The slider 39 is sleeved on the screw rod 3102 and located between the pair of mounting blocks 311.

[0055] Through this arrangement, when the driving motor 3101 drives the screw rod 3102 to rotate forward, the nut 3103 drives the lifting rod 34 to move upward through the slider 39; when the driving motor 3101 drives the screw rod 3102 to rotate reversely, the nut 3103 drives the lifting rod 34 to move downward through the slider 39.

[0056] The working process of this embodiment is described in detail below:

[0057] During operation, the injection molding plastic is injected into the extrusion mechanism 4 through the hopper 7. Under the action of the supercharger in the extrusion mechanism 4, the injection molding plastic enters the delivery pipe 5. When passing through the melt batching mechanism 37, the injection molding plastic is heated into a melt. At this time, the control valve 312 is in a closed state, and ventilation is maintained to the air inlet 334.

[0058] The rotating base 2 rotates around its axis. During the revolution of the injection molding support 31, the roller 35 first abuts the descending section of the lifting cam 6. Under the cooperation of the gravity of the upper injection mold 33 and the second elastic member 36, the upper injection mold 33 is driven to move downward until it abuts against the lower injection mold 32 and the molds are closed. At the same time, the lifting rod 34 is driven by the driving motor 3101 to descend into the upper injection mold 33 and the lower injection mold 32, and the control valve 312 is opened to inject the melt into the lower injection mold 32 to injection-mold the container. Then, the control valve 312 is closed.

[0059] The rotating seat 2 continues to rotate around its axial centerline, and the lifting rod 34 rises under the drive of the driving motor 3101 and disengages from the injection lower mold 32 and the injection upper mold 33 in turn. During the revolution of the injection support 31, the roller 35 abuts the rising section of the lifting cam 6, so that the injection upper mold 33 rises under the drive of the lifting cam 6 until the bottom of the molded container is upwardly separated from the injection lower mold 32, and then the container is clamped by the clamping mechanism in the subsequent process, and then the air inlet is cut off to separate the upper part of the container from the injection upper mold 33, so that the clamping mechanism can smoothly remove the molded container from the injection upper mold 33.

[0060] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary injection molding machine for container preparation, characterized in that: The invention comprises a frame, a rotating base rotatable around its own axis on the frame, a plurality of injection units arranged on the rotating base in a circumferential direction and spaced apart from each other, an extrusion mechanism provided on the rotating base and used to store injection-molded plastic, and a plurality of conveying pipes provided one-to-one between the extrusion mechanism and the injection units; The injection molding unit includes an injection molding support provided on the rotating seat, an injection molding lower mold provided on the injection molding support or the rotating seat, an injection molding upper mold provided on the injection molding support and located above the injection molding lower mold in a liftable manner, and a lifting rod provided on the injection molding support in a liftable manner, wherein an upper through hole and a lower through hole for the lifting rod to pass through are respectively formed in the injection molding upper mold and the injection molding lower mold; The injection mold includes a cylindrical outer mold, at least two inner mold halves arranged in the outer mold and arranged along the circumferential direction, the injection mold also includes at least two first elastic members connected one-to-one between the outer mold and the inner mold halves, and an air inlet hole opened on the outer mold. The inner mold halves are used to move inward when air is admitted through the air inlet hole to stretch the first elastic members, so that the outer circumferential surface of the inner mold halves is spaced apart from the inner circumferential surface of the outer mold. The inner mold halves are also used to move outward to abut against the outer mold when the air inlet hole is cut off.

2. The rotary injection molding machine for container preparation according to claim 1, characterized in that: The inner mold halves have an initial position and an injection position, and the inner mold halves are used to switch from the initial position to the injection position when air is admitted through the air inlet hole; When the inner mold halves are in the initial position, at least two of the inner mold halves are spaced apart from each other; When the inner mold halves are in the injection molding position, at least two inner mold halves abut against each other in sequence along the circumferential direction and enclose each other to form a cylindrical inner mold.

3. The rotary injection molding machine for container preparation according to claim 1, characterized in that: The inner mold half 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. The first arcuate inner surface is located above the second arcuate inner surface.

4. The rotary injection molding machine for container preparation according to claim 1, characterized in that: The first elastic member is a tension spring, and the elastic expansion and contraction direction of the tension spring is parallel to the arrangement direction of the inner mold halves and the outer mold, and perpendicular to the lifting direction of the injection upper mold.

5. The rotary injection molding machine for container preparation according to claim 1, characterized in that: In both the outer mold and the inner mold halves, the injection upper mold further includes a guide groove provided on one of them, and a guide member provided on the other one and used to extend into the guide groove.

6. The rotary injection molding machine for container preparation according to claim 1, characterized in that: The rotary injection molding machine also includes a lifting cam arranged on the frame, and the injection unit also includes a roller rotatable around its own axis and arranged on the outside of the injection upper mold, and the roller is used to abut the upper surface of the lifting cam through its outer circumferential surface.

7. The rotary injection molding machine for container preparation according to claim 6, characterized in that: The injection unit further includes a second elastic member having upper and lower ends respectively for connecting the upper injection mold and the lower injection mold, and the second elastic member is used to provide an elastic restoring force for pulling the upper injection mold downward to press the roller against the lifting cam.

8. The rotary injection molding machine for container preparation according to claim 1, characterized in that: The injection molding unit further comprises a melt dispensing mechanism which is arranged on the injection molding support and sleeved on the outside of the delivery pipe. The delivery pipe is used to pass through the melt dispensing mechanism and the injection molding support in sequence.

9. The rotary injection molding machine for container preparation according to claim 1, characterized in that: The injection molding unit also includes a linear guide rail provided on the injection molding support, a slider which can be raised and lowered on the linear guide rail, and a driving mechanism provided on the injection molding support and used to drive the slider to slide. The lifting rod is connected to the slider, and the injection molding upper mold can be raised and lowered on the linear guide rail.

10. The rotary injection molding machine for container preparation according to claim 9, characterized in that: The driving mechanism includes a driving motor arranged on the injection molding support, a screw rod with one end connected to the output end of the driving motor through a coupling, and a nut sleeved on the screw rod and connected to the slider.

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