Exhaust device for a bottle blowing machine

Abstract

The utility model discloses an exhaust device for bottle blowing machine relates to bottle blowing machine technical field. The utility model discloses a fixed base, the top fixed connection of fixed base has the bottle blowing machine body, the side fixed connection of bottle blowing machine body has control module, and the side of bottle blowing machine body is provided with preheating machine. The utility model discloses through the intercoordination of spring reset post and the inclined sealing cover plate, and the automatic adhesion of sealing cover plate and sealing plate is realized when blowing by using high pressure gas self -propulsion, and sealing surface contact is close and stress is even, effectively avoid the gas leakage problem of traditional sealing structure because of improper manual adjustment or component aging, make high pressure gas all act on bottle blank forming, promote bottle wall thickness evenness, and can real -time regulation exhaust pressure and exhaust speed, can satisfy the demand of thin -walled beverage bottle quick pressure relief, and can also adapt the solidification requirement of thick -walled industrial drum, pharmaceutical bottle slow exhaust.

Description

Technical Field

[0001] This invention relates to the field of blow molding machine technology, and in particular to an exhaust device for blow molding machines. Background Technology

[0002] A blow molding machine is a device that transforms plastic raw materials into hollow containers through a blow molding process. It can heat and soften plastic granules, and then blow them into bottles of various shapes using high-pressure air.

[0003] According to a public disclosure (Publication No.: CN223252318U), an exhaust device for a blow molding machine includes a support plate with an assembly hole in the middle of its surface. An exhaust assembly is inserted into the surface of the support plate. The exhaust assembly includes an exhaust pipe that penetrates and is inserted into the assembly hole of the support plate. The support plate is mounted on the ceiling directly above the blow molding machine and secured using locking devices through the mounting hole. The intake end of the exhaust pipe is connected to a fume hood, and the exhaust end is connected to an exhaust connector via a fume fan. The exhaust connector is connected to an external pipeline. The fume fan is activated via an external control device. The heat generated during the blow molding machine's operation is directionally discharged along the external pipeline under the negative pressure at the opening of the fume hood, reducing heat accumulation and balancing the heat energy above the oven. After the modification, the empty bottle process is significantly stabilized, the defect rate has been reduced to within the standard range, and production quality has been improved.

[0004] In the aforementioned applications, although the exhaust fan and exhaust hood work together to achieve the discharge of ambient heat, the core focus is on the thermal balance of the oven area. It is difficult to solve the problem of sealing and protecting the high-pressure gas inside the preform during the blow molding stage and the precise pressure regulation and exhaust function. This leads to gas leakage due to poor sealing during high-pressure blow molding of the preform, causing pressure loss and problems such as uneven bottle wall thickness and incomplete molding. At the same time, because the exhaust speed is fixed and cannot be adjusted, it cannot adapt to the different needs of rapid pressure relief for thin-walled beverage bottles and slow exhaust for thick-walled containers, ultimately affecting the product molding accuracy and production compatibility. Therefore, we propose an exhaust device for blow molding machines. Summary of the Invention

[0005] The purpose of this utility model is to provide an exhaust device for a blow molding machine, which solves the existing problems of adjusting exhaust pressure and exhaust speed through the cooperation of a spring return column and an inclined sealing cover plate.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is an exhaust device for a blow molding machine, comprising: a fixed base, a blow molding machine body fixedly connected to the top of the fixed base, a control module fixedly connected to the side of the blow molding machine body, a preheater provided on the side of the blow molding machine body, a placement rack rotatably connected to the top of the preheater, a support platform fixedly connected to the top of the blow molding machine body, an air blowing block slidably connected to the bottom of the support platform, and a pressure regulating and sealing exhaust device provided inside the air blowing block; The pressure regulating and sealing exhaust device includes an exhaust pipe, the side of which is through and fixedly connected to the side of the air blowing block. A pressure regulating valve is fixedly connected to the circumferential surface of the exhaust pipe, and a connecting line is fixedly connected to the top of the pressure regulating valve. A spring return column is rotatably connected to the side wall of the air blowing block, and a sealing cover plate is fixedly connected to the side of the spring return column.

[0007] Furthermore, a sealing plate is fixedly connected to the inner wall of the air-blowing block. When air is blown, the sealing plate blocks the sealing cover to ensure the air-blowing seal. After the air-blowing ends, it resets and guides the gas flow to the exhaust pipe, which not only improves the air-blowing effect but also helps the exhaust to be smooth.

[0008] Furthermore, a sealing ring is provided on the side of the sealing plate, and the side of the sealing plate is located on the displacement trajectory of the sealing cover. The sealing ring on the side of the sealing plate fits precisely with the sealing cover, enhancing the seal during air blowing and guiding the gas to the exhaust pipe after air blowing ends, thus avoiding pressure loss and gas leakage.

[0009] Furthermore, the sealing cover is inclined, and the pressure regulating valve is electrically connected to the control device via a connecting wire. This electrical connection enables precise control of the exhaust pressure and provides status feedback, thereby improving the automation level of the device.

[0010] Furthermore, a limit device for preventing overpressure is provided on the side of the air-blowing block. The limit device for preventing overpressure includes a pressure relief connecting pipe. The side of the pressure relief connecting pipe passes through and is fixedly connected to the side of the air-blowing block. A pressure relief valve is fixedly connected to the circumferential surface of the pressure relief connecting pipe. A limit block is fixedly connected to the inner side wall of the air-blowing block.

[0011] Furthermore, the bottom of the limiting block is located on the displacement trajectory of the sealing cover. This limits the maximum displacement of the sealing cover, prevents excessive deformation of the spring return post, and extends the service life of both the sealing cover and the spring return post.

[0012] Furthermore, a blow molding die is slidably connected to the inner wall of the blow molding machine body. The blow molding die, which can slide on the inner wall of the blow molding machine body, can adapt to the production of bottle shapes of different specifications. It works in conjunction with the pressure regulating and sealing exhaust device and the limiting and overpressure prevention device to ensure the consistency and stability of the exhaust effect under diverse production scenarios.

[0013] This utility model has the following beneficial effects: 1. This utility model utilizes the cooperation between the spring return column and the inclined sealing cover plate to achieve automatic sealing of the sealing cover plate and the sealing plate by the thrust of the high-pressure gas during blowing. The sealing surfaces are in close contact and the force is uniform, which effectively avoids the gas leakage problem caused by improper manual adjustment or component aging in traditional sealing structures. It allows all the high-pressure gas to act on the preform forming, improves the uniformity of bottle wall thickness, and can adjust the exhaust pressure and exhaust speed in real time. It can meet the needs of rapid pressure relief for thin-walled beverage bottles and also adapt to the curing requirements of slow exhaust for thick-walled industrial barrels and pharmaceutical bottles.

[0014] The pressure relief connecting pipe and pressure relief valve of this utility model limit and overpressure prevention device can quickly relieve pressure. The limit block and pressure relief valve can deal with extreme abnormal situations, so that the equipment can still operate stably under complex working conditions such as gas supply fluctuations and uneven preform thickness, avoid overpressure inside the bottle and damage to the product or equipment, and ensure the safety of the device operation.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of the overall three-dimensional appearance of this utility model; Figure 2 This is a schematic diagram of the structure of the blow molding machine body of this utility model; Figure 3 This is a schematic diagram of the pressure regulating and sealing exhaust device of this utility model; Figure 4 This is a schematic diagram of the internal structure of the blown plastic block of this utility model; Figure 5 This is a schematic diagram of the structure of the limiting and overpressure prevention device of this utility model.

[0018] The attached diagram lists the components represented by each number as follows: 1. Fixed base; 2. Blow molding machine body; 3. Control module; 4. Preheater; 5. Placement rack; 6. Pressure regulating, sealing, and exhaust device; 7. Limiting and overpressure prevention device; 8. Blow molding die; 9. Support platform; 10. Blowing block; 601. Exhaust pipe; 602. Pressure regulating valve; 603. Connecting wire; 606. Spring return column; 607. Sealing cover plate; 608. Sealing plate; 701. Pressure relief connecting pipe; 702. Pressure relief valve; 703. Limiting block. Detailed Implementation

[0019] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-5 This utility model is an exhaust device for a blow molding machine, comprising: a fixed base 1, a blow molding machine body 2 fixedly connected to the top of the fixed base 1, a control module 3 fixedly connected to the side of the blow molding machine body 2, a preheater 4 provided on the side of the blow molding machine body 2, a placement rack 5 rotatably connected to the top of the preheater 4, a support platform 9 fixedly connected to the top of the blow molding machine body 2, an air blowing block 10 slidably connected to the bottom of the support platform 9, and a pressure regulating and sealing exhaust device 6 provided inside the air blowing block 10. The pressure regulating and sealing exhaust device 6 includes an exhaust pipe 601, which is connected to the side of the air blowing block 10. A pressure regulating valve 602 is fixedly connected to the circumferential surface of the exhaust pipe 601. A connecting line 603 is fixedly connected to the top of the pressure regulating valve 602. A spring return column 606 is rotatably connected to the side wall of the air blowing block 10. A sealing cover plate 607 is fixedly connected to the side of the spring return column 606.

[0021] As shown in the figure, a sealing plate 608 is fixedly connected to the inner wall of the air blowing block 10. When blowing air, the sealing plate 608 blocks the sealing cover 607 to ensure the air blowing is airtight. After blowing ends, it resets and guides the gas flow to the exhaust pipe 601, which not only improves the blowing effect but also helps the exhaust to be smooth.

[0022] As shown in the figure, a sealing ring is provided on the side of the sealing plate 608, and the side of the sealing plate 608 is located on the displacement trajectory of the sealing cover plate 607. The sealing ring on the side of the sealing plate 608 fits precisely with the sealing cover plate 607, which strengthens the seal during air blowing and guides the gas to the exhaust pipe 601 after the air blowing ends, thus avoiding pressure loss and gas leakage.

[0023] As shown in the figure, the sealing cover 607 is inclined, and the pressure regulating valve 602 is electrically connected to the control device via the connecting line 603. The pressure regulating valve 602 is electrically connected to the control device via the connecting line 603 to achieve precise regulation of exhaust pressure and status feedback, thereby improving the level of automation control of the device.

[0024] As shown in the figure, the side of the air blowing block 10 is provided with a limit anti-overpressure device 7. The limit anti-overpressure device 7 includes a pressure relief connecting pipe 701, which is connected to the side of the air blowing block 10 through and fixedly connected. A pressure relief valve 702 is fixedly connected to the circumferential surface of the pressure relief connecting pipe 701, and a limit block 703 is fixedly connected to the inner side wall of the air blowing block 10.

[0025] As shown in the figure, the bottom of the limiting block 703 is located on the displacement trajectory of the sealing cover 607. This limits the maximum displacement of the sealing cover 607, prevents excessive deformation of the spring return post 606, and extends the service life of both the sealing cover 607 and the spring return post 606.

[0026] As shown in the figure, a blow molding die 8 is slidably connected to the inner wall of the blow molding machine body 2. The blow molding die 8, which can slide on the inner wall of the blow molding machine body 2, can adapt to the production of bottle shapes of different specifications. It works in conjunction with the pressure regulating and sealing exhaust device 6 and the limit and overpressure prevention device 7 to ensure the consistency and stability of the exhaust effect under diverse production scenarios.

[0027] A specific application of this embodiment is as follows: After the blow molding machine starts, the preheater 4 completes the preheating of the preform, the blow molding die 8 closes in place, and the air blowing block 10 slides along the bottom of the support platform 9 to the top of the die, aligning with the opening of the preform. At this time, the spring return column 606 is in a naturally extended state, causing the sealing cover 607 to be inclined and attached to the inner wall of the air blowing block 10. The sealing ring on the side of the sealing plate 608 is not completely pressed against the sealing cover 607, the exhaust pipe 601 is unobstructed, and the pressure regulating valve 602 is connected to the connecting line 6. 03. An electrical connection is established with the control module 3. After the blow molding machine starts, the preheater 4 completes the preform preheating, the blow molding die 8 closes in place, and the air blowing block 10 slides along the bottom of the support platform 9 to the top of the die, aligning with the preform opening. At this time, the spring return column 606 is in a naturally extended state, causing the sealing cover 607 to tilt and adhere to the inner wall of the air blowing block 10. The sealing ring on the side of the sealing plate 608 is not completely pressed against the sealing cover 607, the exhaust pipe 601 is unobstructed, and the pressure regulating valve 602 is connected via the connecting line. 603 establishes an electrical connection with control module 3. During the blowing process, control module 3 adjusts the pressure threshold of the exhaust channel in real time through pressure regulating valve 602. If the gas pressure is insufficient, the sealing cover 607 cannot be completely closed. Pressure regulating valve 602 closes the exhaust channel to ensure concentrated gas injection and guarantee the preform forming accuracy. After the preform forming reaches the set time, control module 3 issues a stop blowing command, and the high-pressure gas supply is interrupted. At this time, spring return column 606 loses gas thrust, elastically resets, and drives sealing cover 607 to rotate in the opposite direction, disengaging from the contact state with sealing plate 608. The inclined guide surface of sealing plate 608 guides the high-pressure gas remaining in the preform to exhaust pipe 601. Control module 3 adjusts the exhaust speed through pressure regulating valve 602 according to the forming requirements. For thin-walled bottle types, the opening of pressure regulating valve 602 is increased to quickly release pressure and avoid bottle deformation. For thick-walled bottle types, the opening is reduced to slowly exhaust gas and ensure the stability of bottle wall curing. After exhaust is completed, sealing cover 607 returns to its initial position under the action of spring return column 606.

[0028] The pressure relief valve 702 in the overpressure prevention device 7 is closed. The pressure relief connection pipe 701 is connected to the inside of the air blowing block 10 but is not activated. The limiting block 703 is fixed to the inner wall of the air blowing block 10, with its bottom aligned with the maximum displacement trajectory of the sealing cover plate 607, matching the elastic limit of the spring return column 606. During the air blowing sealing stage, if the high-pressure gas thrust increases abnormally, the sealing cover plate 607 will continue to move towards the sealing plate 608 under the action of the gas. When the top of the sealing cover plate 607 contacts the bottom of the limiting block 703, the limiting block 703 will form a rigid block, restricting the sealing cover plate 607 from continuing to move. To prevent permanent deformation of the spring return column 606 due to excessive stretching, and to protect the contact surfaces of the sealing cover plate 607 and the sealing plate 608 from impact damage, thus extending the service life of the core sealing components, if the internal pressure of the preform continues to rise and exceeds the equipment's safety threshold, the pressure relief valve 702 will automatically trigger to open, quickly discharging excess high-pressure gas through the pressure relief connection pipe 701, reducing the internal pressure of the blowing block 10 to a safe range, preventing the preform from rupturing due to overpressure or damage to the blowing mold 8. After the pressure returns to normal, the pressure relief valve 702 will automatically close and return to the standby state, ensuring the safety and stability of subsequent production.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An exhaust device for a blow molding machine, characterized in that, include: A fixed base (1) is fixedly connected to the top of the fixed base (1) and a blow molding machine body (2). A control module (3) is fixedly connected to the side of the blow molding machine body (2). A preheater (4) is provided on the side of the blow molding machine body (2). A placement rack (5) is rotatably connected to the top of the preheater (4). A support platform (9) is fixedly connected to the top of the blow molding machine body (2). An air blowing block (10) is slidably connected to the bottom of the support platform (9). A pressure regulating and sealing exhaust device (6) is provided inside the air blowing block (10). The pressure regulating and sealing exhaust device (6) includes an exhaust pipe (601), the side of which is connected to the side of the air blowing block (10), a pressure regulating valve (602) is fixedly connected to the circumferential surface of the exhaust pipe (601), a connecting line (603) is fixedly connected to the top of the pressure regulating valve (602), a spring return column (606) is rotatably connected to the side wall of the air blowing block (10), and a sealing cover plate (607) is fixedly connected to the side of the spring return column (606).

2. The exhaust device for a blow molding machine according to claim 1, characterized in that, A sealing plate (608) is fixedly connected to the inner wall of the air blowing block (10).

3. The exhaust device for a blow molding machine according to claim 2, characterized in that, A sealing ring is provided on the side of the sealing plate (608), and the side of the sealing plate (608) is located on the displacement trajectory of the sealing cover plate (607).

4. The exhaust device for a blow molding machine according to claim 3, characterized in that, The sealing cover (607) is inclined, and the pressure regulating valve (602) is electrically connected to the control device via a connecting line (603).

5. The exhaust device for a blow molding machine according to claim 4, characterized in that, The side of the air blowing block (10) is provided with a limiting overpressure prevention device (7). The limiting overpressure prevention device (7) includes a pressure relief connecting pipe (701). The side of the pressure relief connecting pipe (701) passes through and is fixedly connected to the side of the air blowing block (10). A pressure relief valve (702) is fixedly connected to the circumferential surface of the pressure relief connecting pipe (701). A limiting block (703) is fixedly connected to the inner side wall of the air blowing block (10).

6. An exhaust device for a blow molding machine according to claim 5, characterized in that, The bottom of the limiting block (703) is located on the displacement trajectory of the sealing cover plate (607).

7. An exhaust device for a blow molding machine according to claim 6, characterized in that, The blow molding die (8) is slidably connected to the inner wall of the blow molding machine body (2).

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