Blow molding machine and hollow molding process

Abstract

The invention discloses a blow molding machine and a hollow molding process, belonging to the technical field of polymer material blow molding, and is characterized in that it comprises a frame, an extruder, a mold clamping mechanism and a blowing mechanism for product molding, and is characterized in that the blowing mechanism comprises a molding blow needle station, a shaping blow needle station I and a shaping blow needle station II arranged at equal intervals, and an extruder die head capable of extruding a product that is blown and molded for the first time and moving down to the position of the shaping mold I; the beneficial effects of the invention are: the single cooling time is greatly reduced, and the mold shifting structure including a mold shifting oil cylinder, a mold shifting linear slide rail and a mold clamping station is used to realize flow operation, greatly reduce processing time, and improve work efficiency; a plurality of mold clamping stations are arranged on a mold shifting oil cylinder connected to the mold shifting linear slide rail, so as to realize the movement of the mold, and avoid the problem that the preform is not truly cooled and shaped, and the transfer will inevitably cause damage to the product.

Description

Technical field:

[0001] The invention belongs to the technical field of polymer material blow molding, and more specifically relates to a blow molding machine and a hollow molding process. Background technology:

[0002] The blow molding device performs blow molding or stretch blow molding on a bottomed cylindrical preform (injection molded product) made of a thermoplastic resin such as PET, excluding the mouth portion thereof, to produce a blow molded product such as a bottle-shaped container.

[0003] During the cooling and solidification stage of the hollow product, the parison is inflated and pressed against the mold wall, and then cooled by the mold with high thermal diffusivity and compressed air. After cooling to a certain temperature, the mold is opened and then cooled in the air. The existing technology cools and molds in one step, which takes a long time and has low production efficiency.

[0004] The national invention patent with patent number 201811048855.6 discloses a blow molding device, which uses a transfer robot to transfer the preforms and performs multiple blow molding, thereby reducing the time of single molding and improving work efficiency in conjunction with assembly line operations; however, the device uses a transfer robot for transfer and then performs multiple shaping. During the transfer process, since the preforms have not been truly cooled and shaped, the transfer will inevitably result in damage to the product. Summary of the invention:

[0005] In order to solve the above problems and overcome the shortcomings of the prior art, the present invention provides a blow molding machine and a hollow molding process.

[0006] The first technical problem to be solved is: the one-time cooling molding process has a long time for single cooling molding and low production efficiency;

[0007] The second technical problem to be solved is that the multiple cooling stations need to transfer the preforms. Since the preforms have not been truly cooled and shaped, the transfer will inevitably lead to product damage and increase the defective rate of the products.

[0008] The specific technical solution of the present invention to solve the above technical problems is: the blow molding machine includes a frame, an extruder, a mold clamping mechanism and a blowing mechanism for product molding, and is characterized in that the blowing mechanism includes a molding blow needle station and at least 2 shaping blow needle stations arranged at equal intervals.

[0009] Furthermore, a mold clamping mechanism is arranged below the blowing mechanism, and the mold clamping mechanism is arranged into a plurality of mold clamping stations arranged at equal intervals, the number of the mold clamping stations is equal to the number of the blowing mechanism stations, and the spacing is consistent with the spacing of the blowing mechanism.

[0010] Furthermore, the mold clamping mechanism with multiple mold clamping stations is arranged on a mold shifting linear slide rail, and the frame is provided with a mold shifting cylinder capable of sliding the mold clamping mechanism horizontally along the mold shifting linear slide rail. The mold clamping stations include molding mold I, molding mold II and molding mold III.

[0011] Furthermore, a molding blow needle is arranged on the molding blow needle station, and a main balance rod is arranged on one side of the molding blow needle.

[0012] Furthermore, the blowing mechanism includes a shaping blow needle station I and a shaping blow needle station II, wherein the shaping blow needle station I is provided with a shaping blow needle I connected to the upper and lower control cylinders I and a shaping blow needle I clamping claw; the shaping blow needle station II is provided with a shaping blow needle II connected to the upper and lower control cylinders II.

[0013] Furthermore, a conveying robot, a forced air cooling pipe for cutting waste edges, a punching die station, a transfer robot for transferring the product from the punching die to a conveyor belt, and a leak detection system are arranged on the outside of the clamping mechanism.

[0014] A hollow molding process, using a blow molding machine, includes a mixing process, a feeding process, a plasticizing process and a mold closing process, characterized in that the specific steps include:

[0015] Ⅰ The blowing mechanism moves upward under the action of the upper and lower control cylinders, the mold shifting cylinder pushes the mold clamping mechanism and slides horizontally along the mold shifting linear slide rail, the shaping mold Ⅰ is located below the extruder die head, the shaping mold Ⅱ is located below the shaping blow needle station Ⅰ, and the shaping mold Ⅲ is located below the shaping blow needle station Ⅱ;

[0016] Ⅱ The first blown product is extruded and moved down to the position of the finalizing mold Ⅰ under the action of the extruder die head. The mold shifting cylinder pushes the mold clamping mechanism and slides horizontally along the mold shifting linear slide rail. The finalizing mold Ⅰ is located below the molding blow needle station, the finalizing mold Ⅱ is located below the molding blow needle station Ⅰ, and the finalizing mold Ⅲ is located below the molding blow needle station Ⅱ; the blowing mechanism moves downward under the action of the upper and lower control cylinders, and the molding blow needle descends and inserts into the barrel mouth of the finalizing mold Ⅰ for preliminary cooling and molding. The molding time is controlled at 22-30 seconds. A main balance bar is also provided on one side of the molding blow needle.

[0017] The mold is opened at the mold-closing station Ⅲ. The short-term molded product is still hot and will be kept on the main blow needle and the main balance rod to prevent the product from falling after the mold is opened; the mold-shifting cylinder pushes the mold-closing mechanism and slides horizontally along the mold-shifting linear slide rail to reset. The molding mold Ⅰ is located below the extruder die head, the molding mold Ⅱ is located below the molding blow needle station Ⅰ, and the molding mold Ⅲ is located below the molding blow needle station Ⅱ;

[0018] The mold is closed at the mold closing station V, and the product is transferred to the shaping mold II. The blowing mechanism moves downward under the action of the upper and lower control cylinders, and the shaping blow needle I descends and inserts into the barrel mouth of the shaping mold II for further cooling and shaping. The shaping time is controlled at 22-30 seconds. The mold is opened at the mold closing station. The product cannot be hung on the shaping blow needle station I after further cooling. The shaping blow needle station I is equipped with a shaping blow needle I clamping air claw to clamp the once shaped product.

[0019] ⅥThe mold-shifting cylinder pushes the mold-closing mechanism and slides horizontally along the mold-shifting linear slide rail to reset. The molding mold I is located below the extruder die head, the molding mold II is located below the molding blow needle station I, and the molding mold III is located below the molding blow needle station II; the mold-closing station closes the mold, and the product is transferred to the molding mold III. The blowing mechanism moves downward under the action of the upper and lower control cylinders, and the molding blow needle II descends and inserts into the barrel mouth of the molding mold III; further cooling and shaping are carried out, and the shaping time is controlled at 22-30 seconds. The mold-closing station opens the mold, and the product cannot be hung on the molding blow needle station I after further cooling, and directly falls on the conveyor belt to obtain a secondary shaped product.

[0020] Furthermore, the secondary formed product is sent to the conveying robot through the conveyor belt, and transferred to the forced air cooling pipe of the cut waste edge for further air cooling of the waste edge, and the waste edge is cut off through the die station; then the transfer robot is used to transfer the product from the die to the conveyor belt and the measurement system is inspected.

[0021] The beneficial effects of the present invention are as follows: the present invention creatively sets a forming blow pin station, a shaping blow pin station I and a shaping blow pin station II, which greatly reduces the single cooling time, and cooperates with a mold shifting structure including a mold shifting oil cylinder, a mold shifting linear slide rail and a mold closing station to realize flow operation, greatly reduce processing time and improve work efficiency;

[0022] The present invention creatively arranges a plurality of mold closing stations cooperating with the forming blow needle station, the shaping blow needle station I and the shaping blow needle station II on the mold shifting oil cylinder connected to the mold shifting linear slide rail, thereby realizing the movement of the mold and avoiding the problem that the preformed product is inevitably damaged when being transferred without being truly cooled and shaped;

[0023] The present invention creatively utilizes the principle that the briefly molded product is still hot and will remain on the main blowing needle and the main balance rod, so that the product will not fall after the template is opened. The setting of the clamping air claws at the molding blowing needle station is eliminated, thus avoiding the damage of the clamping air claws to the softer initially molded product, and making it possible to achieve assembly line operation only by moving the mold. Description of the drawings:

[0024] Attached Figure 1 It is a schematic diagram of the present invention;

[0025] Attached Figure 2 Schematic diagram of the linear slide rail for mold transfer of the present invention; in the accompanying drawings:

[0026] 1. Molding mold I, 2. Molding mold II, 3. Molding mold III, 4. Mold transfer cylinder, 5. Mold transfer linear slide rail, 6. Main balance bar, 7. Molding blow needle, 8. Extruder die head, 9. Extruder, 10. Molding blow needle upper and lower control cylinder, 11. Upper and lower control cylinder I, 12. Molding blow needle I clamping claw, 13. Molding blow needle I, 14. Upper and lower control cylinder II, 15. Molding blow needle II, 16. Conveying robot, 17. Cutting waste edge forced air cooling pipe, 18. Die station, 19. Transfer robot, 20. Leak detection system. Specific implementation method:

[0027] In the description of the present invention, specific details are only for a full understanding of the embodiments of the present invention, but those skilled in the art should know that the implementation of the present invention is not limited to these details. In addition, well-known structures and functions are not described or shown in detail to avoid blurring the key points of the embodiments of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Specific implementation of the present invention:

[0029] The blow molding machine comprises a frame, an extruder 9, a clamping mechanism and a blowing mechanism for product molding, wherein the blowing mechanism comprises a molding blow needle 7 station and at least two shaping blow needle stations arranged at equal intervals.

[0030] Furthermore, a mold clamping mechanism is arranged below the blowing mechanism, and the mold clamping mechanism is arranged into a plurality of mold clamping stations arranged at equal intervals, the number of the mold clamping stations is equal to the number of the blowing mechanism stations, and the spacing is consistent with the spacing of the blowing mechanism.

[0031] Furthermore, the mold clamping mechanism with multiple mold clamping stations is arranged on a mold shifting linear slide rail 5, and the frame is provided with a mold shifting cylinder 4 which can slide the mold clamping mechanism horizontally along the mold shifting linear slide rail 5, and the mold clamping station includes a molding mold Ⅰ1, a molding mold Ⅱ2 and a molding mold Ⅲ3.

[0032] Furthermore, a molding blow needle 7 is provided on the molding blow needle 7 station, and a main balance rod 6 is also provided on one side of the molding blow needle 7 .

[0033] Furthermore, the blowing mechanism includes a molding blow needle station I and a molding blow needle station II. The molding blow needle station I is provided with a molding blow needle I 13 connected to the upper and lower control cylinders I 11 and a molding blow needle I clamping claw 12; the molding blow needle station II is provided with a molding blow needle II 15 connected to the upper and lower control cylinders II 14.

[0034] Furthermore, a conveying robot 16, a cut waste edge forced air cooling pipe 17, a die station 18, a transfer robot 19 for transferring the product from the die to the conveyor belt, and a leak detection system 20 are arranged on the outside of the mold clamping mechanism.

[0035] In order to more intuitively demonstrate the advantages of the equipment and process of the present invention, the specific operations are as follows:

[0036] A hollow molding process, using the above blow molding machine, includes a mixing process, a feeding process, a plasticizing process and a mold closing process, characterized in that the specific steps include:

[0037] The blowing mechanism Ⅰ moves upward under the action of the upper and lower control cylinders, the mold shifting cylinder 4 pushes the mold clamping mechanism and slides horizontally along the mold shifting linear slide rail 5, the shaping mold Ⅰ1 is located below the extruder die head 8, the shaping mold Ⅱ2 is located below the shaping blow needle station Ⅰ, and the shaping mold Ⅲ3 is located below the shaping blow needle station Ⅱ;

[0038] Ⅱ The first blown product is extruded and moved down to the position of the shaping mold Ⅰ1 under the action of the extruder die head 8. The mold shifting cylinder 4 pushes the mold clamping mechanism and slides horizontally along the mold shifting linear slide rail 5. The shaping mold Ⅰ1 is located below the shaping blow needle 7 station, the shaping mold Ⅱ2 is located below the shaping blow needle station Ⅰ, and the shaping mold Ⅲ3 is located below the shaping blow needle station Ⅱ; the blowing mechanism moves downward under the action of the upper and lower control cylinders, and the shaping blow needle 7 descends and inserts into the barrel mouth of the shaping mold Ⅰ1 for preliminary cooling and shaping. The shaping time is controlled at 22-30 seconds. A main balance bar 6 is also provided on one side of the shaping blow needle 7;

[0039] The mold is opened at the mold-closing station Ⅲ. The short-term molded product is still hot and will be kept on the main blow needle and the main balance rod 6, so that the product will not fall after the mold is opened; the mold-shifting cylinder 4 pushes the mold-closing mechanism and slides horizontally along the mold-shifting linear slide rail 5 to reset. The molding mold Ⅰ1 is located below the extruder die head 8, the molding mold Ⅱ2 is located below the molding blow needle station Ⅰ, and the molding mold Ⅲ3 is located below the molding blow needle station Ⅱ;

[0040] The mold closing station V closes the mold, and the product is transferred to the shaping mold II 2. The blowing mechanism moves downward under the action of the upper and lower control cylinders, and the shaping blow needle I 13 descends and inserts into the barrel of the shaping mold II 2 for further cooling and shaping. The shaping time is controlled at 22-30 seconds. The mold closing station opens the mold, and the product cannot be hung on the shaping blow needle station I after further cooling. The shaping blow needle station I is provided with a shaping blow needle I clamping claw 12 on one side to clamp the once shaped product.

[0041] The mold shifting cylinder Ⅳ pushes the mold clamping mechanism and slides horizontally along the mold shifting linear slide rail 5 to reset. The molding mold Ⅰ1 is located below the extruder die head 8, the molding mold Ⅱ2 is located below the molding blow needle station Ⅰ, and the molding mold Ⅲ3 is located below the molding blow needle station Ⅱ; the mold clamping station closes the mold, and the product is transferred to the molding mold Ⅲ3. The blowing mechanism moves downward under the action of the upper and lower control cylinders, and the molding blow needle Ⅱ15 descends and is inserted into the barrel mouth of the molding mold Ⅲ3; further cooling and shaping are carried out, and the shaping time is controlled at 22-30 seconds. The mold clamping station opens the mold, and the product cannot be hung on the molding blow needle station Ⅰ after further cooling, and directly falls on the conveyor belt to obtain a secondary shaped product.

[0042] Furthermore, the product that has undergone secondary shaping is sent to the conveying robot 16 through the conveyor belt, and is transferred to the cut waste edge forced air cooling pipe 17 for further air cooling of the waste edge, and the waste edge is cut off through the die station 18; then the transfer robot 19 is used to transfer the product from the die to the conveyor belt and perform detection by the measurement system.

[0043] Among them, the forming blow needle station, the shaping blow needle station I and the shaping blow needle station II all include a cooling duckbill, a cooling air head and a compressed cold air supply mechanism, the compressed cold air supply mechanism is connected to the cooling duckbill and provides cooling air, the cooling air head is arranged on the workbench and connected to the cooling air source, the cooling duckbill includes a nozzle and a threaded connection section, and a plurality of columnar injection air holes are arranged on the nozzle, which conforms to the principle of aerodynamics and effectively reduces the air resistance during operation and improves the cooling efficiency;

[0044] The mold clamping station includes the finalizing mold I, finalizing mold II and finalizing mold III, all of which include left-right symmetrical molds. The serpentine cooling coils are evenly distributed in the split mold mechanism. The cooling medium inlet and cooling medium outlet are set on the side of the mold. The cooling medium is cooling water or compressed cooling air. The serpentine cooling coils are provided with inner fins along the inner wall of the tube. There are two inner fins, and the inner fins have a protruding thread line structure. The two inner fins are symmetrically arranged along the inner wall and cross each other. The first thread line structure and the second thread line structure are used to make the cooling medium hit the inner side of the cooling water coil without stopping when passing through the cooling water coil, thereby improving the heat exchange efficiency.

[0045] In summary, the present invention creatively arranges the forming blow pin station, the shaping blow pin station I and the shaping blow pin station II, which greatly reduces the single cooling time, and cooperates with the mold shifting structure including the mold shifting oil cylinder, the mold shifting linear slide rail and the mold closing station to realize the flow operation, greatly reduce the processing time and improve the work efficiency;

[0046] The present invention creatively arranges a plurality of mold closing stations cooperating with the forming blow needle station, the shaping blow needle station I and the shaping blow needle station II on the mold shifting oil cylinder connected to the mold shifting linear slide rail, thereby realizing the movement of the mold and avoiding the problem that the preformed product is inevitably damaged when being transferred without being truly cooled and shaped;

[0047] The present invention creatively utilizes the principle that the briefly molded product is still hot and will remain on the main blowing needle and the main balance rod, so that the product will not fall after the template is opened. The setting of the clamping air claws at the molding blowing needle station is eliminated, thus avoiding the damage of the clamping air claws to the softer initially molded product, and making it possible to achieve assembly line operation only by moving the mold.

Claims

1. A blow molding machine, comprising a frame, an extruder (9), a mold clamping mechanism and a blowing mechanism for molding a product, characterized in that The blowing mechanism comprises a forming blow pin station, a shaping blow pin station I and a shaping blow pin station II arranged at equal intervals, and an extruder die head (8) capable of extruding a first blow-molded product and moving the product down to the position of the shaping die I; A mold clamping mechanism is arranged below the blowing mechanism, and the mold clamping mechanism is arranged into a plurality of mold clamping stations arranged at equal intervals, the number of the mold clamping stations is equal to the number of the blowing mechanism stations, and the spacing is consistent with the spacing of the blowing mechanism; the mold clamping stations include a shaping mold I (1), a shaping mold II (2) and a shaping mold III (3); The mold clamping mechanism is arranged on a mold shifting linear slide rail (5), and a mold shifting oil cylinder (4) capable of making the mold clamping mechanism slide horizontally along the mold shifting linear slide rail (5) is arranged on the frame. The molding blow needle station is provided with a molding blow needle (7), and a main balance rod (6) is also provided on one side of the molding blow needle (7); The shaping blow needle station I is provided with a shaping blow needle I (13) connected to the upper and lower control cylinders I (11) and a shaping blow needle I clamping claw (12); the shaping blow needle station II is provided with a shaping blow needle II (15) connected to the upper and lower control cylinders II (14).

2. The blow molding machine according to claim 1, characterized in that The outer side of the mold clamping mechanism is provided with a conveying robot (16), a cut waste edge forced air cooling pipe (17), a die station (18), a transfer robot (19) for transferring the product from the die to a conveyor belt, and a leak detection system (20).

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