Sealing structure of bottle blowing machine

Abstract

The utility model relates to the technical field of bottle blowing machine sealing, in particular to a bottle blowing machine sealing structure which comprises a sealing mechanism arranged on the outer side of a bottle blowing pipe of a bottle blowing machine, and the sealing mechanism comprises a first ring shell fixed to the outer side of the bottle blowing pipe of the bottle blowing machine; the plurality of circular pipes are fixed on the top wall of the annular shell I at equal angles; the extrusion air supply mechanism comprises a second annular shell, the second annular shell is fixed between one ends of the multiple round pipes, and the outer wall of the second annular shell penetrates through one ends of the round pipes. According to the sealing mechanism, the ring frame IV is matched with the silicon rubber sealing film, so that the inner wall of a bottle blank is supported during sealing, a bottle blank opening is prevented from being extruded and deformed, the sealing stability is ensured, gas leakage is effectively avoided, the bottle blowing quality is improved, and the ring frame IV can be detached and replaced according to bottle blank openings of different sizes, so that the adaptability of the sealing mechanism to different bottle blanks is enhanced; the situation that the whole sealing structure needs to be replaced due to the size change of the bottle blank is reduced, and production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for blow molding machines, specifically a sealing structure for blow molding machines. Background Technology

[0002] In the field of blow molding production, the sealing structure is a key component of the blow molding machine, and its performance directly affects the quality, production efficiency, and production cost of blow-molded products. With the continuous development of the plastic products market, the demand for blow-molded products is becoming increasingly diversified, and the size, shape, and material of preforms are becoming more and more varied, which places stringent requirements on the sealing structure of blow molding machines.

[0003] Currently, most blow molding machines on the market have some drawbacks in their sealing structures. Traditional rigid sealing structures, due to their fixed shape and size, have poor adaptability to preforms of different sizes. Once the preform size changes, the rigid sealing structure cannot fit tightly against the preform opening, easily leading to gas leakage, severely affecting the bottle molding quality, and significantly increasing the defect rate. Although some elastic sealing structures can cope with differences in preform size to a certain extent, in practical applications, the elastic range of some simple elastic sealing structures is limited. When the preform size changes beyond its elastic deformation limit, the sealing performance will be greatly reduced. Utility Model Content

[0004] The purpose of this invention is to provide a sealing structure for a blow molding machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A sealing structure for a blow molding machine, comprising:

[0007] A sealing mechanism is provided on the outside of the blow tube of the blow molding machine, the sealing mechanism including a ring shell fixed on the outside of the blow tube of the blow molding machine;

[0008] Several circular tubes are provided and fixed at equal angles to the top wall of the annular shell;

[0009] The extrusion air delivery mechanism includes a second ring shell, which is fixed between one end of several round tubes and the outer wall of the second ring shell penetrates one end of the round tubes. The second ring shell is fixedly connected to the outside of the blow molding tube of the blow molding machine. The extrusion air delivery mechanism includes a pressure-receiving upward moving unit fixedly connected to the outer wall of the first ring shell.

[0010] An annular hole is formed on the inner wall of the annular shell;

[0011] A silicone rubber sealing film is fixed inside the annular hole.

[0012] Furthermore, the sealing mechanism includes:

[0013] One vent is located on the top wall of the annular shell at the point where the circular tube is located.

[0014] Preferably, the sealing mechanism includes:

[0015] A threaded groove is formed on the inner top wall of the annular shell, and a ring frame is screwed into the threaded groove.

[0016] Preferably, the extrusion air delivery mechanism includes:

[0017] There are several pores, which are opened at equal angles on the inner wall of the second ring shell.

[0018] Preferably, the extrusion air delivery mechanism includes:

[0019] The airbag is fixed to the outer wall of the second ring shell and its interior is connected to the second air hole.

[0020] Preferably, the pressure-receiving upward displacement unit includes:

[0021] Ring frame one is slidably inserted into the outer wall of ring shell one, and ring frame two is fixedly connected to the outer wall of ring frame one;

[0022] The buffer pad is fixed to the outer wall of one side of the ring frame.

[0023] Four round rods are provided and are fixed at equal angles to the outer wall of the second ring frame.

[0024] Preferably, the pressure-receiving upward displacement unit includes:

[0025] Ring frame three is fixedly connected to the outer wall of ring shell one, and a spring is fixedly connected between the outer wall of ring frame three and the outer wall of ring frame two.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] 1. By cooperating with the silicone rubber sealing film, the ring frame four supports the inner wall of the preform during sealing, preventing the preform opening from being squeezed and deformed, ensuring the stability of the seal, effectively avoiding gas leakage, improving the quality of blow molding, and the ring frame four can be disassembled and replaced according to different preform opening sizes, enhancing the adaptability of the sealing mechanism to different preforms, reducing the need to replace the entire sealing structure due to changes in preform size, and improving production efficiency.

[0028] 2. By applying different degrees of compression to the airbags through the ring frame during the blow molding process, the sealing strength of the silicone rubber sealing film can be precisely controlled to meet the needs of different blow molding processes. Furthermore, multiple evenly distributed round tubes deliver gas between the airbags and the silicone rubber sealing film, ensuring that the gas can be evenly delivered into the ring shell, achieving uniform expansion of the silicone rubber sealing film and thus ensuring the reliability of the seal.

[0029] 3. Through the design of the pressure-receiving upward moving unit, when the blow molding tube moves downward, the round rod contacts the top wall of the mold, stably transmitting the extrusion force, causing the ring frame two to squeeze the air bag upward. After the blow molding is completed, the spring rebound drives the ring frame two to move downward and separate from the air bag, realizing the reset of the air bag under the influence of the rebound of the silicone rubber sealing film, ensuring the stability and reliability of the sealing and unsealing operations. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0032] Figure 3 This is a schematic diagram of the ring shell structure in this utility model;

[0033] Figure 4 This is a partial structural diagram of the extrusion air delivery mechanism in this utility model;

[0034] Figure 5 This is a schematic diagram of the pressure-receiving upward-moving unit structure in this utility model.

[0035] In the diagram: 100, sealing mechanism; 110, ring shell one; 111, ring hole; 112, air hole one; 113, round tube; 114, threaded groove; 120, silicone rubber sealing membrane; 130, ring frame four; 200, extrusion air supply mechanism; 210, ring shell two; 211, air hole two; 220, air bladder; 230, pressure-bearing upward moving unit; 231, ring frame one; 232, ring frame two; 233, round rod; 234, ring frame three; 235, spring; 236, buffer pad. Detailed Implementation

[0036] 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.

[0037] Please see Figure 1-5In this embodiment of the present invention, a sealing structure for a blow molding machine includes a sealing mechanism 100 disposed on the outside of the blow molding tube of the blow molding machine. The sealing mechanism 100 includes a first annular shell 110 fixed to the outside of the blow molding tube of the blow molding machine, wherein a plurality of circular tubes 113 are disposed thereon and fixed at equal angles to the top wall of the first annular shell 110. The extrusion air supply mechanism 200 includes a second annular shell 210, which is fixed between one end of a plurality of circular tubes 113, and the outer wall of the second annular shell 210 penetrates one end of the circular tubes 113. The second annular shell 210 is fixedly connected to the outside of the blow molding tube of the blow molding machine. The extrusion air supply mechanism 200 includes a sealing mechanism fixed to the outer wall of the first annular shell 110. The connected pressure-receiving upward moving unit 230 has an annular hole 111 opened on the inner wall of the annular shell 110, and the silicone rubber sealing film 120 is fixed inside the annular hole 111. The air hole 112 is opened on the top wall of the annular shell 110 at the circular tube 113. The extrusion air supply mechanism 200 includes: several air holes 211 are provided, which are opened at equal angles on the inner wall of the annular shell 210. The air bag 220 is fixed on the outer wall of the annular shell 210 and communicates with the air holes 211. By using the ring frame 232 to compress the air bag 220 to different degrees during the bottle blowing process, the sealing strength of the silicone rubber sealing film 120 can be precisely controlled.

[0038] The sealing mechanism 100 includes: a threaded groove 114 formed on the inner top wall of the ring shell 110, and a ring frame 130 screwed into the threaded groove 114. The ring frame 130 cooperates with the silicone rubber sealing film 120 to support the inner wall of the bottle preform during sealing and prevent the bottle preform mouth from being squeezed and deformed.

[0039] The pressure-receiving upward displacement unit 230 includes: a ring frame 231 that is slidably inserted into the outer wall of the ring shell 110; a ring frame 232 that is fixedly connected to the outer wall of the ring frame 231; a buffer pad 236 that is fixed to one side of the outer wall of the ring frame 232; four round rods 233 that are fixed at equal angles to the outer wall of the ring frame 232; a ring frame 234 that is fixedly connected to the outer wall of the ring shell 110; and a spring 235 that is fixedly connected between the outer wall of the ring frame 234 and the outer wall of the ring frame 232. Through the design of the pressure-receiving upward displacement unit 230, when the blow tube moves downward, the round rods 233 contact the top wall of the mold, stably transmitting the extrusion force, causing the ring frame 232 to extrude upward into the airbag 220.

[0040] Specifically, during operation, the blow molding tube moves downwards, and the tube head is inserted into the preform. At this point, the preform opening is positioned between the ring frame 130 and the silicone rubber sealing membrane 120, ensuring initial alignment between the silicone rubber sealing membrane 120 and the preform opening. As the blow molding tube continues to move downwards, the round rod 233 contacts and is compressed against the top wall of the mold, causing the ring frame 232 to move upwards and compress the air bladder 220. The gas inside the air bladder 220 enters the silicone rubber sealing membrane 120 evenly through several round tubes 113, causing the silicone rubber sealing membrane 120 to deform and expand, tightly adhering to the preform opening to achieve a seal. The ring frame 130 adheres to the inner wall of the preform, providing support and preventing the expansion of the silicone rubber sealing membrane 120 from deforming the softened preform opening. The ring frame 130 can be disassembled and replaced according to different preform opening sizes. The sealing strength of the silicone rubber sealing membrane 120 is determined by the air pressure inside the air bladder 220; the greater the downward distance of the blow molding tube, the stronger the air pressure. The polydimethylsiloxane (PDMS) coating on the outer layer of the silicone rubber sealing film 120, due to its good flexibility and low surface energy, does not affect the deformation capability of the silicone rubber sealing film 120, and reduces the friction between it and the preform, preventing wear on the preform. After sealing, high-pressure gas is introduced into the blow molding tube. Due to the good sealing performance of the silicone rubber sealing film 120, gas leakage is effectively prevented, ensuring the smooth progress of the blow molding process, allowing the preform to be blow-molded under the action of high-pressure gas. After blow molding is completed, the blow molding tube moves upward, the round rod 233 separates from the mold, and the spring 235 rebounds, causing the ring frame 232 to move downward and separate from the airbag 220, reducing the pressure on the airbag 220. The silicone rubber sealing film 120, relying on its own elasticity, sends the internal gas back into the airbag 220, returning to its original position, releasing the seal on the preform. At this time, the molded bottle can be taken out for subsequent processing.

[0041] Example 1

[0042] like Figure 2 As shown, in this embodiment, the sealing mechanism 100 includes: a threaded groove 114 formed on the inner top wall of the annular shell 110, and a ring frame 130 screwed into the threaded groove 114.

[0043] In this embodiment, the ring frame 130 cooperates with the silicone rubber sealing film 120 to support the inner wall of the preform during sealing, preventing the preform opening from being squeezed and deformed, ensuring the stability of the seal, effectively avoiding gas leakage, improving the blow molding quality, and the ring frame 130 can be disassembled and replaced according to different preform opening sizes, enhancing the adaptability of the sealing mechanism 100 to different preforms, reducing the need to replace the entire sealing structure due to changes in preform size, and improving production efficiency.

[0044] like Figure 2-3As shown, in this embodiment, the sealing mechanism 100 includes an annular shell 110 fixed to the outside of the blow molding tube of the blow molding machine. Several circular tubes 113 are provided on the top wall of the annular shell 110 at equal angles. An annular hole 111 is opened on the inner wall of the annular shell 110, and a silicone rubber sealing film 120 is fixed inside the annular hole 111. An air hole 112 is opened on the top wall of the annular shell 110 at the circular tube 113. The extrusion air supply mechanism 200 includes several air holes 211, which are opened at equal angles on the inner wall of the annular shell 210. An air bladder 220 is fixed to the outer wall of the annular shell 210 and communicates internally with the air holes 211.

[0045] In practice, by varying the degree of compression of the airbag 220 by the ring frame 232 during the blow molding process, the sealing strength of the silicone rubber sealing membrane 120 can be precisely controlled to meet the needs of different blow molding processes. Furthermore, multiple evenly distributed circular tubes 113 are used to supply air between the airbag 220 and the silicone rubber sealing membrane 120, ensuring that the gas can be evenly delivered into the ring shell 110, thereby achieving uniform expansion of the silicone rubber sealing membrane 120 and ensuring the reliability of the seal.

[0046] Example 2

[0047] like Figure 5 As shown, in this embodiment, the pressure-receiving upward moving unit 230 includes: a ring frame 231 that is slidably inserted into the outer wall of the ring shell 110; a ring frame 232 that is fixedly connected to the outer wall of the ring frame 231; a buffer pad 236 that is fixed to one side of the outer wall of the ring frame 232; four round rods 233 that are fixed at equal angles to the outer wall of the ring frame 232; a ring frame 234 that is fixedly connected to the outer wall of the ring shell 110; and a spring 235 that is fixedly connected between the outer wall of the ring frame 234 and the outer wall of the ring frame 232.

[0048] In practice, through the design of the pressure-receiving upward moving unit 230, when the blow molding tube moves downward, the round rod 233 contacts the top wall of the mold, stably transmitting the extrusion force, causing the ring frame 232 to press the air bag 220 upward. After the blow molding is completed, the spring 235 rebounds and drives the ring frame 232 to move downward, separating from the air bag 220. This allows the air bag 220 to be reset due to the rebound of the silicone rubber sealing film 120, ensuring the stability and reliability of the sealing and unsealing operations.

[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sealing structure for a blow molding machine, characterized in that, include: A sealing mechanism (100) is provided on the outside of the blow tube of the blow molding machine. The sealing mechanism (100) includes an annular shell (110) fixed on the outside of the blow tube of the blow molding machine. Several circular tubes (113) are provided and are fixed at equal angles to the top wall of the annular shell (110); The extrusion air delivery mechanism (200) includes a second ring shell (210), which is fixed between one end of several round tubes (113), and the outer wall of the second ring shell (210) penetrates one end of the round tubes (113). The second ring shell (210) is fixedly connected to the outside of the blown tube of the blown bottle machine. The extrusion air delivery mechanism (200) includes a pressure-receiving upward moving unit (230) fixedly connected to the outer wall of the first ring shell (110). An annular hole (111) is formed on the inner wall of the annular shell (110); A silicone rubber sealing film (120) is fixed inside the annular hole (111).

2. The sealing structure of a blow molding machine according to claim 1, characterized in that, The sealing mechanism (100) includes: Vent 1 (112) is located on the top wall of the annular shell 1 (110) at the circular tube (113).

3. The sealing structure of a blow molding machine according to claim 2, characterized in that, The sealing mechanism (100) includes: A threaded groove (114) is formed on the inner top wall of the annular shell (110), and a ring frame (130) is screwed into the threaded groove (114).

4. The sealing structure of a blow molding machine according to claim 3, characterized in that, The extrusion air delivery mechanism (200) includes: A number of vents (211) are provided and are opened at equal angles on the inner wall of the second ring shell (210).

5. The sealing structure of a blow molding machine according to claim 4, characterized in that, The extrusion air delivery mechanism (200) includes: The airbag (220) is fixed on the outer wall of the second ring shell (210) and its interior is connected to the second air hole (211).

6. The sealing structure of a blow molding machine according to claim 5, characterized in that, The pressure-receiving upward displacement unit (230) includes: Ring frame one (231) is slidably inserted into the outer wall of ring shell one (110), and ring frame two (232) is fixedly connected to the outer wall of ring frame one (231); The buffer pad (236) is fixed to the outer wall of one side of the ring frame (232); Four round rods (233) are provided and are fixed at equal angles to the outer wall of the second ring frame (232).

7. The sealing structure of a blow molding machine according to claim 6, characterized in that, The pressure-receiving upward displacement unit (230) includes: Ring frame three (234) is fixedly connected to the outer wall of ring shell one (110), and a spring (235) is fixedly connected between the outer wall of ring frame three (234) and the outer wall of ring frame two (232).

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