Plastic bottle blow molding device

Abstract

The utility model discloses a plastic bottle blow molding device, relates to the technical field of plastic bottle production, and aims to solve the technical problems that when a special-shaped bottle body with two thick ends and a thin middle part is subjected to blow molding, materials at the thick ends are stacked, a thin neck is excessively stretched and the wall thickness does not reach the standard due to non-uniform airflow distribution, the plastic bottle blow molding device comprises a machine table, and a molding mechanism is arranged in the middle of the upper surface of the machine table; a blow molding mechanism is arranged in the forming mechanism, a sealing mechanism is arranged on the blow molding mechanism, and pushing mechanisms are arranged at the two ends of the upper surface of the machine table. The profile of the vertical rod is matched with that of the bottle body to form a structure with two thick ends and a thin middle part, the surface of the vertical rod is provided with a gradually-changed axial spray hole group, the spiral block is arranged in the middle of the vertical rod, a spiral spray hole array generates rotary-cut airflow, and high-pressure gas forms diffusion airflow through the axial spray holes to cover the thick ends and the thin necks during blow molding. The airflow matching of the special-shaped section is optimized through pressure gradient compensation, and the problems of material accumulation and excessive stretching are relieved.

Description

Technical Field

[0001] This utility model relates to the field of plastic bottle production technology, and more specifically, to a plastic bottle blow molding apparatus. Background Technology

[0002] Plastic bottles, as lightweight packaging containers, are widely used in the food and daily chemical industries. They are mostly manufactured using blow molding, which involves heating and softening a plastic preform, then using high-pressure gas to inflate it and shape it to fit the inner wall of a mold. With market demands for functionality and differentiation, the shape of plastic bottles has gradually broken away from the traditional cylindrical design. For example, irregular shapes that are thicker at both ends and thinner in the middle can improve grip comfort while reducing material usage.

[0003] Existing blow molding equipment mostly uses single-point blowing needles or uniformly distributed straight-hole blowing structures, which are insufficiently adaptable to irregularly shaped bottles that are thicker at both ends and thinner in the middle. During the blowing process, the thicker end of the bottle is prone to material accumulation due to insufficient gas diffusion, while the thinner neck is prone to excessive stretching and thinning due to concentrated airflow, making it difficult to achieve the required wall thickness uniformity. In view of this, we propose a blow molding device for plastic bottles. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a plastic bottle blow molding device to solve the technical problem that uneven airflow distribution leads to material accumulation at the thick end and excessive stretching at the thin neck, resulting in substandard wall thickness during blow molding of irregularly shaped bottles that are thick at both ends and thin in the middle.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a plastic bottle blow molding device, including a machine base, a molding mechanism arranged in the middle of the upper surface of the machine base, a blow molding mechanism arranged inside the molding mechanism, a closing mechanism arranged on the blow molding mechanism, and a pushing mechanism arranged at both ends of the upper surface of the machine base;

[0006] The blow molding mechanism includes a vertical rod, which is thick at both ends and thin in the middle. A spiral block is arranged on the vertical rod, and multiple spray holes are arranged at intervals along its spiral direction on the spiral block.

[0007] Preferably, the molding mechanism includes a mold, the mold having a cavity, the cavity having a shape that is thick at both ends and thin in the middle, the inner wall of the mold having multiple heat conduction channels, the distance between the multiple heat conduction channels and the inner wall of the mold cavity being between -mm, and the multiple heat conduction channels being connected through a connecting channel A.

[0008] Preferably, the sealing mechanism includes a sealing block, a spring is arranged inside the sealing block, one end of the spring is connected to a linkage block, the linkage block is fixed on a vertical rod, and the vertical rod is inserted into the sealing block.

[0009] Preferably, the pushing mechanism comprises a frame arranged on the machine table, supports arranged inside both sides of the frame, the supports being in the shape of a pentagonal structure, a pneumatic cylinder A arranged inside one end of the supports, and a mold connected to the output end of the pneumatic cylinder A.

[0010] Preferably, a pneumatic cylinder B is arranged inside the upper end of the frame, and a vertical rod is connected to the output end of the pneumatic cylinder B.

[0011] Preferably, a cavity A is formed in the upper end of the vertical rod, and a cavity B is formed in the inside of the spiral block, and the cavity B is connected to the cavity A through a connecting channel B.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. The vertical rod adopts a two-end-thick-middle-thin profiling structure consistent with the target bottle body, and the spiral block is arranged following the external shape of the vertical rod, and the outer wall of the spiral block is provided with axially distributed spray holes, high-pressure gas is distributed to the inside of the spiral block through the vertical rod main channel during blow molding, and then the gas is uniformly transmitted to the inside of the spray holes by the spiral block, the spray holes form diffusion airflow corresponding to the thick end region of the bottle body, the spiral arranged spray holes spray airflow that covers the thin neck part, and the profiling flow guiding of the parison is realized through pressure gradient compensation, the airflow path is dynamically matched with the profile of the special-shaped bottle body, and the problems of material accumulation or excessive stretching at the section mutation in the traditional blowing mode are effectively relieved.

[0014] 2. The cavity A is arranged at the top of the vertical rod, the cavity B is integrated in the inside of the spiral block, and the two are connected through the connecting channel B, the high-pressure gas is introduced into the cavity B through the connecting channel B after entering the cavity A, and the gas is sprayed through the spiral trajectory distributed spray holes, so that the gas forms a rotational flow output along the tangential direction, the design makes the airflow fill the mold cavity in a diffusion mode at the thick end region of the bottle body, and realizes material extension control through rotational cutting acceleration at the thin neck part, effectively optimizes the airflow coverage uniformity at the special-shaped section, and promotes the profiling fitting of the parison and the mold.

[0015] 3. The heat conduction channel and the connecting channel A are designed, the profiling cooling waterway design is adopted, the heat conduction channel is arranged in the mold inner wall at a distance of 3-5 mm from the mold cavity inner wall, the distance can consider heat conduction efficiency and structural strength, the topological path is matched with the profile of the bottle body, and the longitudinal connecting channel A is used to realize the longitudinal through connection of multiple channels, and the cooling medium can be evenly distributed into each heat conduction channel, and the turbulent flow is formed in the serpentine heat conduction channel to strengthen heat exchange, and the structure realizes the directional drainage of the heat of the bottle body through gradient temperature difference control, and the shrinkage deformation risk caused by the difference in cooling rate in the special-shaped region is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the main view appearance structure schematic diagram of the utility model;

[0017] Figure 2 It is the main view appearance structure schematic diagram of the utility model;

[0018] Figure 3 It is the main view appearance structure schematic diagram of the utility model;

[0019] Figure 4 It is the main view appearance structure schematic diagram of the utility model;

[0020] Figure 5 It is the main view appearance structure schematic diagram of the utility model;

[0021] Figure 6 It is the main view appearance structure schematic diagram of the utility model;

[0022] Figure 7 It is the main view appearance structure schematic diagram of the utility model.

[0023] Mark explanation in drawing:

[0024] 1, machine table, 2, forming mechanism, 201, mould, 202, mould cavity, 203, heat conduction channel, 204, connecting channel A, 3, blowing mechanism, 301, vertical rod, 302, spiral block, 303, injection hole, 304, cavity A, 305, cavity B, 306, connecting channel B, 4, closing mechanism, 401, sealing block, 402, spring, 403, linkage block, 5, pushing mechanism, 501, frame, 502, support, 503, cylinder A, 504, cylinder B. Specific implementation

[0025] As Figures 1 to 7 shown, the utility model relates to a kind of plastic bottle blow molding device, including machine table 1, the middle of the upper surface of machine table 1 is arranged with forming mechanism 2, forming mechanism 2 is arranged with blowing mechanism 3 inside, blowing mechanism 3 is arranged with closing mechanism 4, the upper surface of machine table 1 is arranged with pushing mechanism 5 in both ends.

[0026] The blowing mechanism 3 comprises a vertical rod 301 in the shape of thick ends and thin middle, a spiral block 302 arranged on the vertical rod 301, and a plurality of jet holes 303 arranged on the spiral block 302 in the spiral direction of the spiral block 302. The vertical rod 301 is in the shape of thick ends and thin middle consistent with the target bottle body, and the spiral block 302 is arranged following the external shape of the vertical rod 301, and the external wall of the spiral block 302 is provided with the axially distributed jet holes 303, the high-pressure gas is distributed into the spiral block 302 through the main channel of the vertical rod 301, and then the gas is uniformly transmitted into the jet holes 303 by the spiral block 302, the jet holes 303 form diffused gas flow corresponding to the thick end region of the bottle body, the spiral jet holes 303 spray the gas to generate rotary cutting gas flow covering the thin neck part, the pressure gradient compensation realizes the conformal flow guiding of the parison, the structure dynamically matches the gas flow path with the profile of the special-shaped bottle body, and effectively relieves the material accumulation or excessive stretching problem at the section mutation in the traditional blowing mode.

[0027] In the embodiment of the utility model, the forming mechanism 2 comprises a mould 201, a mould cavity 202 is set up in the mould 201, the mould cavity 202 is in the shape of thick ends and thin middle, a plurality of heat conduction channels 203 are set up in the inner wall of the mould 201, the distance between the plurality of heat conduction channels 203 and the inner wall of the mould cavity 202 is between 3-5mm, and the plurality of heat conduction channels 203 are communicated through connecting channel A 204. The utility model discloses a heat conduction channel 203 and connecting channel A 204 structure, which adopts a conformal cooling waterway design, the heat conduction channel 203 is arranged in the inner wall of the mould 201 at a distance of 3-5mm from the inner wall of the mould cavity 202, the distance can take into account the heat conduction efficiency and structural strength, the topological path is conformally matched with the profile of the bottle body, and the longitudinal connecting channel A 204 is used to realize the longitudinal penetration of the multiple channels, so that the cooling medium can be evenly distributed into each heat conduction channel 203, the turbulent flow is formed in the serpentine heat conduction channel 203 to strengthen heat exchange, and the structure realizes the directional drainage of the heat of the bottle body through gradient temperature difference control, so that the shrinkage deformation risk of the special-shaped area caused by the difference in cooling rate can be reduced.

[0028] In the embodiment of the utility model, the closing mechanism 4 comprises a sealing block 401, a spring 402 is arranged in the sealing block 401, one end of the spring 402 is connected with a linkage block 403, the linkage block 403 is fixed on the vertical rod 301, and the vertical rod 301 is inserted into the sealing block 401. The utility model discloses a sealing block 401, a spring 402 and a linkage block 403 structure, when the vertical rod 301 is pushed into the mould cavity 202 by the cylinder B 504, the sealing block 401 of the vertical rod 301 will first contact the upper surface of the mould 201, the gap at the position is closed, when the cylinder B 504 continues to push the vertical rod 301, the linkage block 403 of the vertical rod 301 will press the sealing block 401 together with the spring 402, so that the sealing block 401 is fixed and closed, and the closing effect and the insertion of the vertical rod 301 are buffered.

[0029] In the embodiment of the utility model, push mechanism 5 includes the frame 501 of arrangement on the machine table 1, frame 501 inside both sides are equipped with support 502, support 502 is pentagonal structure shape, support 502 inside one end is equipped with cylinder A 503, and cylinder A 503 output end is connected with mould 201. The support 502 of pentagonal structure shape design of the utility model can limit the installation of cylinder A 503 from multiple angles, the stress generated when cylinder A 503 works can be evenly dispersed by each side, avoid cylinder A 503 to appear to shake or shift in the use process, promote the reliability and stability of overall structure, the installation of cylinder A 503 makes two moulds 201 can separate and combine, and the inside parison blows moulding when combining, and the blanking and feeding operation are convenient when separating.

[0030] In the embodiment of the utility model, frame 501 inside upper end is equipped with cylinder B 504, and cylinder B 504 output end is connected with vertical rod 301. The utility model discloses a cylinder B 504 structure is designed, and the height of vertical rod 301 can be adjusted, can control vertical rod 301 to go up and down and go in and out of mould cavity 202 inside, indirectly control vertical rod 301 to go up and down and go in and out of parison inside, reached the effect of controlling the use height position of vertical rod 301.

[0031] In the embodiment of the utility model, vertical rod 301 upper end inside is equipped with cavity A 304, and spiral block 302 inside is equipped with cavity B 305, and cavity B 305 is communicated with cavity A 304 through connecting channel B 306. The utility model discloses a cavity A 304, connecting channel B 306 and cavity B 305 structure are designed, and cavity A 304 is arranged at the top of vertical rod 301, and cavity B 305 is integrated in the inside of spiral block 302, and the both are realized through connecting channel B 306, and high-pressure gas enters cavity A 304 and is guided into cavity B 305 through connecting channel B 306, and after gas enters cavity B 305, cooperate with the jet hole 303 of spiral trajectory distribution and spray, make gas tangential rotation flow output, this design makes the airflow in the rough end area of bottle body to fill the cavity in diffusion mode, and realizes material extension control through spin cutting acceleration in the thin neck part, effectively optimizes the airflow covering uniformity at the special-shaped cross section, promotes the conformal fit of parison and mould 201.

[0032] Working principle: the utility model provides a plastic bottle blow molding device, use staff need to connect power supply of the utility model first, control the operation of the utility model through control panel, staff will put the parison between two molds 201, after being placed in the position, staff control cylinder A503 to push the output end connected mold 201, two molds 201 will merge together and limit the parison in the mold cavity 202, after the parison is placed in the mold cavity 202, staff control cylinder B504 to push the output end connected vertical rod 301, vertical rod 301 drops and inserts into the mold cavity 202, then directly inserts into the parison, when vertical rod 301 inserts into the parison, its sealing block 401 contacts the surface of mold 201 first, at this time, when cylinder B504 continues to push vertical rod 301, it will compress spring 402 through connecting block 403, then use spring 402 to tightly press sealing block 401 at the gap position of mold 201, close the position, after vertical rod 301 is completely inserted into the parison, staff transports gas into the cavity A304 in vertical rod 301 through high-pressure gas source system and air pipe, the gas in cavity A304 is transmitted into cavity B305 in spiral block 302 through connecting channel B306, the gas in cavity B305 is spirally transmitted and then sprayed through multiple spray holes 303, blow molding is carried out on the parison placed in the mold cavity 202, when the parison is blow molded into a bottle body, staff also needs to start the pump to deliver the cooling liquid into the heat conduction channel 203 through liquid pipe A, the liquid in heat conduction channel 203 conducts away the temperature in the blow molded bottle body, is delivered to the heat dissipation device through liquid pipe B and is heat dissipated, so as to be recycled subsequently, when the staff controls cylinder A503 to pull the output end connected mold 201 after cooling and molding, two molds 201 will be separated, and the molded bottle body in it will be exposed, staff controls cylinder B504 to lift vertical rod 301 again, and vertical rod 301 is pulled out of the bottle body, so the process of plastic bottle blow molding is completed.

[0033] The embodiments of the utility model disclose the better embodiment, but it is not limited to this, the ordinary skill of the art, the person, the spirit of the utility model is easily understood according to the above-mentioned embodiment, and different inferences and changes are made, but as long as not departing from the spirit of the utility model, all are within the protection scope of the utility model.

Claims

1. A plastic bottle blow molding apparatus comprising a machine table (1), characterized in that: The middle of the upper surface of the machine (1) is arranged with a forming mechanism (2), the inside of the forming mechanism (2) is arranged with a blow molding mechanism (3), the blow molding mechanism (3) is arranged with a sealing mechanism (4), the both ends of the upper surface of the machine (1) are arranged with a pushing mechanism (5). The blow molding mechanism (3) comprises a vertical rod (301), the vertical rod (301) is in the shape of a structure with thick ends and a thin middle, the vertical rod (301) is arranged with a spiral block (302), a plurality of jet holes (303) are arranged on the spiral block (302) at intervals along the spiral direction thereof.

2. A plastic bottle blow molding apparatus according to claim 1, wherein: The forming mechanism (2) comprises a mold (201), a mold cavity (202) is formed in the mold (201), the mold cavity (202) is in the shape of a structure with thick ends and a thin middle, a plurality of heat conduction channels (203) are formed in the inner wall of the mold (201), the distance between the heat conduction channels (203) and the inner wall of the mold cavity (202) is between 3-5mm, and the heat conduction channels (203) are connected through a connecting channel A (204).

3. A plastic bottle blow molding apparatus according to claim 2, wherein: The sealing mechanism (4) comprises a sealing block (401), the inside of the sealing block (401) is arranged with a spring (402), one end of the spring (402) is connected with a linkage block (403), the linkage block (403) is fixed on the vertical rod (301), and the vertical rod (301) is inserted into the sealing block (401).

4. A plastic bottle blow molding apparatus according to claim 3, wherein: The pushing mechanism (5) comprises a frame (501) arranged on the machine (1), supports (502) are arranged on both sides of the inside of the frame (501), the supports (502) are in the shape of a pentagonal structure, a gas cylinder A (503) is arranged at one end of the inside of the support (502), and the output end of the gas cylinder A (503) is connected with the mold (201).

5. A plastic bottle blow molding apparatus according to claim 4, wherein: A gas cylinder B (504) is arranged at the upper end of the inside of the frame (501), and the output end of the gas cylinder B (504) is connected with the vertical rod (301).

6. A plastic bottle blow molding apparatus according to claim 5, wherein: A cavity A (304) is formed in the inside of the upper end of the vertical rod (301), a cavity B (305) is formed in the inside of the spiral block (302), and the cavity B (305) is connected with the cavity A (304) through a connecting channel B (306).

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