Beverage bottle preform injection molding equipment

Abstract

The utility model discloses beverage bottle preform injection molding equipment, which belongs to the technical field of beverage bottle production and comprises an equipment body, a mold cavity and a charging barrel, the mold cavity is arranged on the equipment body, and the charging barrel is used for melting and conveying materials; the device further comprises a preheating cylinder; a preheating mechanism is arranged in the preheating cylinder and is used for preheating plastic particles in the preheating cylinder, so that the plastic particles enter the charging barrel after being preheated; the preheating mechanism comprises a first preheating plate and a second preheating plate, the first preheating plate and the second preheating plate are both located in the preheating cylinder, a first heating piece is installed on the first preheating plate, and a second heating piece is installed on the second preheating plate. According to the utility model, the problems of efficiency and quality caused by the fact that low-temperature materials directly enter the charging barrel in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to the field of beverage bottle production technology, and in particular to a beverage bottle preform injection molding equipment. Background Technology

[0002] Beverage preform injection molding equipment is a key piece of equipment in the plastics processing industry. It heats and melts plastic raw materials and injects them into a mold to form the preform. Traditional injection molding equipment typically includes a hopper, barrel, heating device, and injection mechanism. The hopper stores and transports plastic granules to the barrel. The screw inside the barrel rotates and propels the material, while external electric heating coils heat the barrel in sections, gradually melting the plastic granules into a uniform melt.

[0003] However, in existing technologies, plastic granules are not pretreated before entering the barrel, resulting in an initial temperature close to the ambient temperature. When low-temperature materials enter the barrel directly, a large amount of heat energy and time are required to raise them to the melting temperature. This not only prolongs the production cycle but also reduces melt uniformity due to temperature fluctuations within the barrel, affecting the quality of preform molding. Furthermore, the heating coil is prone to accelerated aging due to prolonged high-load operation, increasing energy consumption and maintenance costs.

[0004] In view of this, the present invention provides a new solution to the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a beverage bottle preform injection molding equipment that solves the efficiency and quality problems caused by the direct entry of low-temperature materials into the barrel in the prior art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A beverage bottle preform injection molding machine includes a machine body, a mold cavity, and a barrel. The mold cavity is disposed on the machine body, and the barrel is used for melting and conveying materials. It also includes a preheating cylinder.

[0008] The preheating cylinder is equipped with a preheating mechanism, which is used to preheat the plastic granules in the preheating cylinder so that the plastic granules are preheated before entering the material cylinder.

[0009] The preheating mechanism includes a first preheating plate and a second preheating plate, both of which are located inside the preheating cylinder. A first heating element is installed on the first preheating plate, and a second heating element is installed on the second preheating plate.

[0010] A further preferred embodiment is that both the first preheating plate and the second preheating plate are provided with multiple through holes.

[0011] A further preferred embodiment is that the preheating cylinder includes a cylinder section and a hopper section, the hopper section being located below the cylinder section and connected to the cylinder.

[0012] A further preferred embodiment is that the first preheating plate is located inside the cylindrical section, and the first preheating plate is a spiral plate that extends along the circumferential wall of the cylindrical section, with its spiral trajectory continuously rising / falling along the axial direction of the cylindrical section.

[0013] A further preferred embodiment is that the second preheating plate is a tapered cone-shaped cylinder with an opening diameter that gradually decreases from top to bottom.

[0014] A further preferred embodiment is that a connecting channel is provided between the hopper section and the cylinder, and the diameter of the connection between the hopper section and the connecting channel is smaller than the diameter of the connection between the cylinder and the connecting channel.

[0015] A further preferred embodiment is that the diameter of the lower opening of the second preheating plate is larger than the diameter of the connection between the hopper section and the connecting channel.

[0016] A further preferred embodiment is that the heating temperature of the second heating element is greater than the heating temperature of the first heating element.

[0017] A further preferred embodiment is that both the first heating element and the second heating element are mica heating elements or ceramic heating elements.

[0018] A further preferred embodiment is that the first heating element is located near the lower end of the first preheating plate.

[0019] In summary, this utility model has the following beneficial effects:

[0020] The beverage bottle preform injection molding equipment of this utility model includes a machine body, a mold cavity, and a material cylinder. The mold cavity is disposed on the machine body, and the material cylinder is used for melting and conveying materials. It also includes a preheating cylinder. A preheating mechanism is disposed inside the preheating cylinder. The preheating mechanism is used to preheat the plastic particles in the preheating cylinder so that the plastic particles are preheated before entering the material cylinder. The preheating mechanism includes a first preheating plate and a second preheating plate. The first preheating plate and the second preheating plate are both located inside the preheating cylinder. A first heating element is installed on the first preheating plate, and a second heating element is installed on the second preheating plate.

[0021] The plastic granules are preheated in the preheating cylinder to bring them closer to their melting temperature, significantly reducing the energy input required for heating the granules inside the cylinder, lowering overall energy consumption, and meeting the requirements of green manufacturing. Preheating the plastic granules before they enter the cylinder for melting optimizes the melting process from the source. This invention solves the efficiency and quality problems caused by directly introducing low-temperature materials into the cylinder in existing technologies. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an injection molding equipment according to a preferred embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of a preferred embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional schematic diagram of a preheating cylinder according to a preferred embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the first preheating plate structure of a preferred embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the second preheating plate structure in a preferred embodiment of the present invention;

[0027] Figure 6 This is a cross-sectional schematic diagram of the connection channel in a preferred embodiment of the present invention.

[0028] In the figure, 1 is the equipment body; 2 is the mold cavity; 3 is the preheating cylinder; 31 is the cylinder section; 32 is the hopper section; 4 is the material cylinder; 5 is the preheating mechanism; 51 is the first preheating plate; 52 is the second preheating plate; 53 is the through hole; 54 is the first heating element; 55 is the second heating element; and 6 is the connecting channel. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example: A beverage bottle preform injection molding equipment, such as Figure 1-6 As shown, the device includes the equipment body, mold cavity, material barrel, and preheating cylinder. The mold cavity is a closed design and contains a preform injection mold. Both the mold cavity and the material barrel are located on the equipment body, and the material barrel is used for melting and conveying materials. The equipment body, mold cavity, and material barrel are all existing technologies, so their specific structures and working principles will not be described in detail here.

[0031] A preheating mechanism is installed inside the preheating cylinder to preheat the plastic granules inside the cylinder so that the plastic granules are preheated before entering the feed cylinder. The preheating mechanism includes a first preheating plate and a second preheating plate, both of which are located inside the preheating cylinder. A first heating element is installed on the first preheating plate, and a second heating element is installed on the second preheating plate.

[0032] In the above technical solution, the plastic granules are preheated in the preheating cylinder to bring them closer to their melting temperature. This significantly reduces the energy input required for heating the plastic granules in the cylinder, lowers overall energy consumption, and meets the requirements of green manufacturing. Preheating the plastic granules before they enter the cylinder for melting optimizes the melting process from the source.

[0033] Preferably, both the first preheating plate and the second preheating plate are provided with a plurality of equally spaced circular through holes, the diameter of which is smaller than the diameter of the plastic particles, so as to restrict the plastic particles from passing through or being blocked in the through holes.

[0034] In the above technical solution, the through-holes allow hot air to circulate vertically within the preheating cylinder, increasing the contact area and frequency between the hot airflow and the plastic granules. This enables forced convection heat transfer, avoids localized temperature differences caused by static heating, and significantly improves preheating uniformity. The through-hole diameter is smaller than the plastic granule diameter, restricting granules from directly passing through or becoming blocked, while allowing hot air to pass freely. This prevents granules from getting stuck and causing blockages, and also prevents granules from falling too quickly due to gravity, maintaining the stability and continuity of granule flow within the preheating cylinder. The uniform distribution of the through-holes regularizes the hot air circulation path, balancing the resistance in different areas of the preheating cylinder and preventing granule accumulation or deviation due to turbulent airflow, ensuring stability in large-scale production.

[0035] Preferably, the preheating cylinder includes a cylindrical section and a hopper section, the cylindrical section being cylindrical in shape. The hopper section is located below the cylindrical section and is connected to the cylinder.

[0036] In a further preferred embodiment, a connecting channel for the passage of plastic granules is provided between the hopper section and the barrel. The diameter of the connection between the hopper section and the connecting channel is smaller than the diameter of the connection between the barrel and the connecting channel, so that the connecting channel is flared to reduce material blockage in the connecting channel.

[0037] Specifically, the connecting channel has a funnel-shaped structure that gradually widens from top to bottom.

[0038] In the above technical solution, the diameter at the connection between the hopper section and the connecting channel is smaller than that at the side interface of the barrel, making the connecting channel a funnel-shaped structure that gradually widens from top to bottom. This design accelerates the flow of plastic granules into the barrel through the dual effects of gravity guidance and flow channel expansion, while avoiding granule accumulation and blockage caused by narrow channels or abrupt cross-sections, significantly improving the continuity and stability of material conveying. The smooth transition of the flared channel reduces the frictional resistance between the granules and the channel wall, especially suitable for preheated granules (with slightly softened surfaces), further reducing the risk of flow obstruction. Preheated granules quickly enter the barrel through the flared channel, reducing heat loss and ensuring seamless integration of the preheating effect with the barrel melting process.

[0039] To facilitate control of material discharge from the preheating cylinder, preferably, a discharge valve can be installed between the connecting channel and the hopper section.

[0040] Preferably, the first preheating plate is located inside the cylindrical section. The first preheating plate is a spiral plate that extends along the circumferential wall of the cylindrical section, and its spiral trajectory is continuously distributed upward and downward along the axial direction of the cylindrical section.

[0041] Specifically, the outer side of the first preheating plate is fixed to the inner surface of the cylinder section.

[0042] Preferably, the second preheating plate is a tapered cone-shaped cylinder with an opening diameter that gradually decreases from top to bottom.

[0043] Specifically, the outer circumference of the port end of the second preheating plate is fixed to the inner circumference of the hopper section.

[0044] Further preferably, the diameter of the lower opening of the second preheating plate is larger than the diameter of the connection between the hopper section and the connecting channel, so as to increase the feeding rate of plastic particles in the hopper section and reduce clogging.

[0045] In the above technical solution, the first preheating plate adopts a spiral plate design extending along the circumferential wall of the cylindrical section (the spiral trajectory is continuously distributed axially), forcing the plastic particles to move slowly along the spiral path. This structure increases the contact area between the particles and the first heating plate by extending the particle residence time, significantly improving the preheating uniformity. The outer side of the first preheating plate is fixed to the inner surface of the cylindrical section, forming a continuous spiral guide surface, guiding the particles to fall regularly along the wall, reducing particle collision and accumulation caused by free fall.

[0046] The tapered cylinder of the second preheating plate (with an opening diameter decreasing from top to bottom) creates a "funnel effect," accelerating particle flow and concentrating heat through the contracting flow channel. This ensures that the particles undergo secondary, uniform heating before entering the hopper section, preventing localized temperature fluctuations. The lower opening diameter of the second preheating plate is larger than the interface diameter between the hopper section and the connecting channel, forming a "velocity difference buffer zone." This prevents particles from directly impacting the connecting channel due to gravity and causing blockages, while also maintaining the continuity of particle flow through the tapering structure.

[0047] Preferably, the heating temperature of the second heating element is greater than that of the first heating element.

[0048] The gradient heating design of the spiral plate (primary preheating) and the tapered plate (secondary preheating) allows the particle temperature to be raised to near the melting point in stages, reducing the heating energy consumption in the barrel.

[0049] Preferably, the first heating element is located near the lower end of the first preheating plate.

[0050] The upper end of the cylindrical section is open, so the first heating element is set at the lower end of the first preheating plate. This can reduce the loss of heat to the outside of the cylindrical section and improve the thermal energy utilization rate. It can also make the temperature of the first preheating plate gradually increase from top to bottom, which is convenient for gradient preheating of materials.

[0051] Preferably, both the first heating element and the second heating element are mica heating elements or ceramic heating elements.

[0052] Mica or ceramic heating elements have low thermal inertia (mica thermal response time ≤15 seconds, ceramic ≤20 seconds), enabling second-level temperature adjustment to precisely match the preheating requirements of different plastic granules (such as PET and PP), avoiding localized overheating or underheating. The layered structure of mica and the sintered density of ceramic ensure uniform temperature distribution on the heating element surface, and the through-holes in the preheating plate create an all-around thermal radiation field, improving the uniformity of granule heating.

[0053] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A beverage bottle preform injection molding equipment, comprising an equipment body, a mold cavity, and a barrel, wherein the mold cavity is disposed on the equipment body, and the barrel is used for melting and conveying materials; characterized in that: It also includes a preheating cylinder; The preheating cylinder is equipped with a preheating mechanism, which is used to preheat the plastic granules in the preheating cylinder so that the plastic granules are preheated before entering the material cylinder. The preheating mechanism includes a first preheating plate and a second preheating plate, both of which are located inside the preheating cylinder. A first heating element is installed on the first preheating plate, and a second heating element is installed on the second preheating plate.

2. The beverage bottle preform injection molding equipment according to claim 1, characterized in that: Both the first preheating plate and the second preheating plate are provided with multiple through holes.

3. The beverage bottle preform injection molding equipment according to claim 1, characterized in that: The preheating cylinder includes a cylinder section and a hopper section, the hopper section being located below the cylinder section and connected to the cylinder.

4. The beverage bottle preform injection molding equipment according to claim 3, characterized in that: The first preheating plate is located inside the cylindrical section. The first preheating plate is a spiral plate and extends along the circumferential wall of the cylindrical section. Its spiral trajectory is continuously distributed upward and downward along the axial direction of the cylindrical section.

5. The beverage bottle preform injection molding equipment according to claim 3, characterized in that: The second preheating plate is a tapered cylinder with a gradually decreasing opening diameter from top to bottom.

6. The beverage bottle preform injection molding equipment according to claim 5, characterized in that: A connecting channel is provided between the hopper section and the cylinder, and the diameter of the connection between the hopper section and the connecting channel is smaller than the diameter of the connection between the cylinder and the connecting channel.

7. The beverage bottle preform injection molding equipment according to claim 6, characterized in that: The diameter of the lower opening of the second preheating plate is larger than the diameter of the connection between the hopper section and the connecting channel.

8. The beverage bottle preform injection molding equipment according to claim 3, characterized in that: The heating temperature of the second heating element is greater than that of the first heating element.

9. The beverage bottle preform injection molding equipment according to claim 1, characterized in that: Both the first heating element and the second heating element are mica heating elements or ceramic heating elements.

10. The beverage bottle preform injection molding equipment according to claim 4, characterized in that: The first heating element is located near the lower end of the first preheating plate.

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