Bottle blank heating device

Abstract

The utility model relates to the technical field of plastic bottle production equipment discloses a bottle blank heating device, including machine table, the annular conveying mechanism of being located on the machine table, the heating box of being located on the machine table top, two groups are located in the heating assembly of heating box, two pieces of vertical fixed in the heating box and with the first reflector of opposite heating assembly, and the air -jet pipe of being detachably equipped on the first reflector near the discharge port place. The utility model through detachable air -jet pipe of installing first reflector near the discharge port place, and make air -jet pipe have multiple gas holes to heating assembly, thus when bottle blank will send out from the discharge port, can through the gas hole to the middle section of bottle blank and spray cooling airflow, can make the middle section of bottle blank get cooling, thereby can adjust the softening degree of bottle blank middle section, make bottle blank middle section and bottle blank other part's softening degree difference can reduce, help guarantee the forming quality of plastic bottle.

Description

Technical Field

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

[0002] Plastic bottles possess advantages such as light weight, durability, good barrier properties, ease of molding, versatility in shape, and low cost, making them highly competitive in the packaging industry. Most plastic bottles are made from PET. Before production, the raw material is first injection molded into a preform. This preform is then heated in a heating device before being placed in a blow molding machine for final shaping. The quality of the preform's heating directly affects the quality of the plastic bottle.

[0003] Chinese patent document CN218196874U discloses a plastic preform heating device, including a worktable, a heating chamber, a ring conveying mechanism on the worktable, and heating pipes inside the heating chamber. When heating the preform, it is placed on the conveying mechanism, which transports it from the inlet to the heating chamber. The conveying mechanism then transports the heated preform out of the heating chamber from the outlet. However, after the preform is heated to a softened state, the middle section softens more than other areas. During blow molding, the middle section is more prone to stretching and thinning, resulting in uneven wall thickness distribution in the plastic bottle. The disclosed plastic preform heating device cannot adjust the softening degree of the heated preform, easily leading to uneven wall thickness distribution in the molded plastic bottle.

[0004] It is evident that existing technologies need improvement and enhancement. Utility Model Content

[0005] The purpose of this invention is to provide a preform heating device that solves the problem that existing plastic preform heating devices cannot adjust the softening degree of the preform after heating.

[0006] A preform heating device includes a machine base, an annular conveying mechanism mounted on the machine base, and a heating chamber mounted above the machine base. The front side of the heating chamber has an inlet and an outlet for the annular conveying mechanism to pass through. It also includes two sets of heating components mounted inside the heating chamber, two first reflectors vertically fixed inside the heating chamber and opposite to the heating components, and an air jet pipe detachably mounted on the first reflectors near the outlet. The annular conveying mechanism is located between the two sets of heating components and is arranged around the first reflectors. The air jet pipe has multiple air outlets spaced apart, and the air outlets face the heating components.

[0007] Optionally, the jet pipe is detachably connected to an air supply pipe; the air supply pipe is introduced downward into the interior of the machine and connected to a compressed air pipeline located outside the machine; the compressed air pipeline is connected to a solenoid valve.

[0008] Optionally, a first oblong hole is formed in the vertical direction on the first reflector; a first connecting rod is horizontally inserted into the first oblong hole; and a first limiting nut is fitted on both sides of the first connecting rod on the first reflector.

[0009] Optionally, a connecting ring is fitted onto the jet pipe; the first connecting rod is fixedly connected to the connecting ring; and a fastening screw that abuts against the wall of the jet pipe is inserted into the connecting ring.

[0010] Optionally, the heating assembly includes a mounting plate vertically mounted on the machine base, heating tubes mounted on the mounting plate at intervals, a second reflector connected to the upper end of the mounting plate, and a third reflector connected to the lower end of the mounting plate; the heating tubes, the second reflector, and the third reflector are all located on the side of the mounting plate facing the first reflector.

[0011] Optionally, the heating tube is fitted with terminals at both ends; the mounting plate has through holes in the vertical direction for the terminals to pass through horizontally.

[0012] Optionally, a bracket is vertically provided on the rear side of the mounting plate; the bracket is fixed on the machine base; a second oblong hole is provided on the terminal block; a second connecting rod is horizontally inserted through the second oblong hole; the second connecting rod is detachably connected to the bracket, and a second limiting nut for clamping the terminal block is sleeved on the second connecting rod.

[0013] Optionally, the bracket has multiple insertion holes spaced apart in the vertical direction; the second connecting rod is inserted into the insertion holes.

[0014] Optionally, two sets of baffles are hung on the front side of the heating box; the two sets of baffles are located in front of the feed inlet and the discharge outlet respectively, and each set of baffles includes two separate sub-baffles.

[0015] Beneficial effects: This invention provides a preform heating device. By installing a detachable jet pipe near the discharge port on the first reflector, and having the jet pipe have multiple air outlets facing the heating component, when the preform is conveyed in the heating channel between the heating component and the first reflector, and just before the preform is discharged from the discharge port, cooling airflow can be sprayed into the middle section of the preform through the air outlets. This cools the middle section of the preform, thereby adjusting the softening degree of the middle section and reducing the difference in softening degree between the middle section and other parts of the preform. During blow molding, this prevents the middle section of the preform from stretching and thinning due to excessive softening, allowing for adjustment of the plastic bottle wall thickness and helping to ensure the molding quality of the plastic bottle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the preform heating device provided by this utility model. Figure 1 .

[0018] Figure 2 yes Figure 1 Enlarged view of section A.

[0019] Figure 3 This is a schematic diagram of the preform heating device provided by this utility model. Figure 2 .

[0020] Figure 4 yes Figure 3 Enlarged view of section B.

[0021] Figure 5 This is a schematic diagram of the preform heating device provided by this utility model. Figure 3 .

[0022] Figure 6 This is a schematic diagram of the structure of the heating component.

[0023] Explanation of icon numbers: 1-Machine base; 2-Circular conveyor mechanism; 3-Heating box; 301-Inlet; 302-Outlet; 4-Heating component; 41-Mounting plate; 411-Perforation; 42-Heating tube; 43-Second reflector; 44-Third reflector; 5-First reflector; 501-First oblong hole; 6-Air jet pipe; 601-Air outlet; 7-Baffle; 8-Air supply pipe; 9-Compressed air pipeline; 10-First connecting rod; 11-First limiting nut; 12-Connecting ring; 13-Fasting screw; 14-Terminal; 141-Second oblong hole; 15-Bracket; 16-Second connecting rod; 17-Second limiting nut; 18-Preform. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0027] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0028] Please see Figures 1 to 6 As shown, this utility model provides a preform heating device, including a machine base 1, an annular conveying mechanism 2 mounted on the machine base 1, and a heating chamber 3 mounted above the machine base 1. The annular conveying mechanism 2 is prior art; its structure and working principle can be found in patent document CN218196874U. The front side of the heating chamber 3 has an inlet 301 and an outlet 302 through which the annular conveying mechanism 2 passes.

[0029] Furthermore, the preform heating device also includes two sets of heating components 4 disposed within the heating chamber 3, two first reflectors 5 vertically fixed within the heating chamber 3 and opposite to the heating components 4, and an air jet pipe 6 detachably mounted on the first reflectors 5 near the discharge port 302; the annular conveying mechanism 2 is located between the two sets of heating components 4 and is arranged around the two first reflectors 5. The first reflectors 5 can reflect the heat generated by the heating components 4, thereby improving the heating efficiency and uniformity of the preform 18. The air jet pipe 6 has an air jet section whose length direction is consistent with the length direction of the machine base 1, and multiple air outlets 601 are spaced apart on the air jet section, the air outlets 601 facing the heating components 4. Compressed air for cooling the preform 18 can be introduced into the jet pipe 6. When the preform 18 is about to be sent out from the discharge port 302, cooling air is sprayed into the middle section of the preform 18 through the air outlet 601. This can cool the middle section of the preform 18, thereby adjusting the softening degree of the middle section of the preform 18. This reduces the difference in softening degree between the middle section of the preform 18 and other parts of the preform 18. During blow molding of the preform 18, this can prevent the middle section of the preform 18 from stretching and thinning due to excessive softening. This allows for adjustment of the plastic bottle wall thickness and helps ensure the molding quality of the plastic bottle.

[0030] like Figure 1 , Figure 2 as well as Figure 4 As shown, in an optional embodiment, the jet pipe 6 is detachably connected to an air supply pipe 8; the air supply pipe 8 extends downward into the interior of the machine 1 and is connected to a compressed air pipeline 9 located outside the machine 1; the compressed air pipeline 9 is connected to a solenoid valve. During operation, the compressed air pipeline 9, connected to a compressed air source, delivers compressed air, which, with the help of the air supply pipe 8 located inside the machine 1, is then delivered to the jet pipe 6. The solenoid valve can control the on / off state and airflow magnitude of the compressed air in the pipeline, thereby avoiding the need to adjust the airflow magnitude in real time according to the conveying rhythm and cooling requirements of the preform 18.

[0031] like Figure 1 and Figure 2As shown, in an optional embodiment, the first reflector 5 has a first oblong hole 501 vertically oriented; a first connecting rod 10 is horizontally inserted into the first oblong hole 501; and a first limiting nut 11 is fitted on both sides of the first connecting rod 10. The first connecting rod 10 has external threads. In this embodiment, the first oblong hole 501 provides vertical adjustment space for the first connecting rod 10. By loosening the first limiting nuts 11 on both the inner and outer sides of the first reflector 5, the jet pipe 6 associated with the first connecting rod 10 can be moved up and down along the first oblong hole 501, thereby flexibly adjusting the vertical height of the jet pipe 6 according to the specifications of the preform 18, ensuring that the air outlet 601 can be aligned with the middle section of the preform 18 to spray cooling airflow.

[0032] like Figure 1 and Figure 2 As shown, in an optional embodiment, a plurality of connecting rings 12 are fitted onto the jet pipe 6; the first connecting rod 10 is fixedly connected to the connecting ring 12; and a fastening screw 13 is inserted into the connecting ring 12 to abut against the wall of the jet pipe 6. The connecting rings 12 ensure that the first connecting rod 10 and the jet pipe 6 remain connected, eliminating the need for additional holes in the jet pipe 6 to connect it to the first connecting rod 10. This reduces unnecessary openings and prevents air leakage caused by openings.

[0033] like Figure 6 As shown, in an optional embodiment, the heating assembly 4 includes a mounting plate 41 vertically mounted on the machine base 1, heating tubes 42 mounted vertically on the mounting plate 41 at intervals, a second reflector 43 connected to the upper end of the mounting plate 41, and a third reflector 44 connected to the lower end of the mounting plate 41. The heating tubes 42, the second reflector 43, and the third reflector 44 are all located on the side of the mounting plate 41 facing the first reflector 5, and the heating tube 42 can be an infrared heating tube 42. In this embodiment, the second reflector 43 and the third reflector 44 can reflect the heat lost by the heating tubes 42 upwards and downwards back to the heating area, respectively, thereby reducing heat loss and improving energy utilization efficiency. Moreover, the second reflector 43 and the third reflector 44 can also cooperate with the first reflector 5 to form a reflective structure surrounding the heating area, further enhancing the heat concentration effect of the heating area and ensuring that the preform 18 is continuously and uniformly heated during the conveying process.

[0034] like Figure 6As shown, in an optional embodiment, the heating tube 42 is fitted with terminals 14 at both ends; the mounting plate 41 has vertically oriented through holes 411 for the terminals 14 to pass through horizontally. The through holes 411 provide a channel for the terminals 14 to pass through the mounting plate 41, allowing the heating tube 42 to be stably mounted on the side of the mounting plate 41 facing the first reflector 5, while allowing the terminals 14 to extend to the rear side of the mounting plate 41 for wiring, thus preventing the wiring portion from being exposed to the heating area and affecting safety or being damaged by high temperatures.

[0035] like Figure 6 As shown, in an optional embodiment, a bracket 15 is vertically provided on the rear side of the mounting plate 41; the bracket 15 is fixed on the machine base 1; a second oblong hole 141 is provided on the terminal block 14; a second connecting rod 16 is horizontally inserted through the second oblong hole 141, and the second oblong hole 141 extends along the front-rear direction of the mounting plate 41; the second connecting rod 16 can be a connecting screw, which is detachably connected to the bracket 15, and a second limiting nut 17 for clamping the terminal block 14 is sleeved on the second connecting rod 16. In this embodiment, the bracket 15 provides an installation area for the second connecting rod 16; and by providing the second oblong hole 141 on the terminal block 14, the terminal block 14 can be adjusted in the horizontal direction, thereby adjusting the distance between the heating tube 42 and the first reflector 5, and thus adapting to the heating requirements of preforms 18 of different diameters. In addition, when the second limiting nut 17 is loosened, the terminal block 14 can swing relative to the second connecting rod 16, thereby realizing the adjustment of the heating angle of the heating tube 42.

[0036] In an optional embodiment, the bracket 15 has a plurality of insertion holes spaced apart in the vertical direction; the second connecting rod 16 is inserted into the insertion holes. The plurality of insertion holes can provide different installation positions for the second connecting rod 16 at different heights, so that a specific number of heating tubes 42 can be selected or the height of the heating tubes 42 can be adjusted according to the heating requirements of the preform 18.

[0037] like Figure 5 As shown, in an optional embodiment, two sets of baffles 7 are hung on the front side of the heating box 3; the two sets of baffles 7 are located in front of the inlet 301 and the outlet 302 respectively, which can block some of the heat in the heating box 3 from being dissipated from the inlet 301 and the outlet 302, thereby reducing heat loss and maintaining the temperature stability in the heating box 3, so that the heating efficiency and heating uniformity of the preform are guaranteed. Moreover, each set of baffles 7 includes two separate sub-baffles 7, so as not to affect the annular conveyor mechanism 2 from driving the preform 18 to enter and exit the heating box 3 normally.

[0038] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A preform heating device, comprising a machine base (1), an annular conveying mechanism (2) disposed on the machine base (1), and a heating box (3) disposed above the machine base (1); wherein the front side of the heating box (3) is provided with an inlet (301) and an outlet (302) for the annular conveying mechanism (2) to pass through; characterized in that, It also includes two sets of heating components (4) in the heating box (3), two first reflectors (5) that are vertically fixed in the heating box (3) and opposite to the heating components (4), and a jet pipe (6) that is detachably mounted on the first reflector (5) near the discharge port (302); the annular conveying mechanism (2) is located between the two sets of heating components (4) and the annular conveying mechanism (2) is arranged around the first reflector (5); the jet pipe (6) has a plurality of air outlets (601) spaced apart, and the air outlets (601) face the heating components (4).

2. The preform heating device according to claim 1, characterized in that, The jet pipe (6) is detachably connected to an air supply pipe (8); the air supply pipe (8) is introduced downward into the interior of the machine (1), and the air supply pipe (8) is connected to a compressed air pipe (9) located outside the machine (1); the compressed air pipe (9) is connected to a solenoid valve.

3. The preform heating device according to claim 1, characterized in that, The first reflector (5) has a first waist-shaped hole (501) in the vertical direction; a first connecting rod (10) is horizontally inserted in the first waist-shaped hole (501); a first limiting nut (11) is fitted on both sides of the first reflector (5) on the first connecting rod (10).

4. The preform heating device according to claim 3, characterized in that, A connecting ring (12) is fitted on the jet pipe (6); the first connecting rod (10) is fixedly connected to the connecting ring (12); a fastening screw (13) is inserted into the connecting ring (12) to abut against the wall of the jet pipe (6).

5. The preform heating device according to claim 1, characterized in that, The heating assembly (4) includes a mounting plate (41) vertically mounted on the machine base (1), heating tubes (42) mounted on the mounting plate (41) at intervals, a second reflector (43) connected to the upper end of the mounting plate (41), and a third reflector (44) connected to the lower end of the mounting plate (41); the heating tubes (42), the second reflector (43), and the third reflector (44) are all located on the side of the mounting plate (41) facing the first reflector (5).

6. The preform heating device according to claim 5, characterized in that, The heating tube (42) is fitted with terminals (14) at both ends; the mounting plate (41) has a through hole (411) in the vertical direction for the terminals (14) to pass through horizontally.

7. The preform heating device according to claim 6, characterized in that, The mounting plate (41) has a vertical bracket (15) on its rear side; the bracket (15) is fixed on the machine base (1); the terminal block (14) has a second oblong hole (141); the second oblong hole (141) has a second connecting rod (16) passing through it horizontally; the second connecting rod (16) is detachably connected to the bracket (15), and a second limiting nut (17) for clamping the terminal block (14) is sleeved on the second connecting rod (16).

8. The preform heating device according to claim 7, characterized in that, The bracket (15) has multiple insertion holes spaced apart in the vertical direction; the second connecting rod (16) is inserted into the insertion holes.

9. The preform heating device according to claim 1, characterized in that, Two sets of baffles are hung on the front side of the heating box (3); the two sets of baffles are located in front of the feed inlet (301) and the discharge outlet (302), respectively, and each set of baffles includes two separate sub-baffles (7).

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