Internal tooth mold structure and injection blow hollow forming machine

Abstract

The invention discloses an internal thread mold structure and an injection blowing hollow forming machine, and belongs to the technical field of hollow plastic product manufacturing, the internal thread mold structure comprises a core mold mechanism and a main machine, the core mold mechanism comprises a core mold injection mechanism, a bottle opening mold mechanism and an injection mold cavity mechanism which are sequentially assembled from top to bottom; according to the internal thread mold structure and the injection-blow hollow molding machine, injection molding of the internal thread pipe blank of the hollow product and blow molding of the hollow product are achieved, and the equipment investment cost is low.

Description

Technical Field

[0001] This invention belongs to the field of hollow plastic product manufacturing technology, specifically relating to an internal thread mold structure and an injection blow molding machine. Background Technology

[0002] Hollow products with internal threads at the bottle mouth refer to thin-walled plastic containers with internal thread structures manufactured by blow molding technology. Their core feature is that the bottle mouth is designed with internal threads (internal threads) to achieve a tight fit with the bottle cap to achieve a seal. At the same time, the container as a whole has a hollow structure to contain liquids or gases.

[0003] Currently, the general method for forming the inner threads of hollow bottle necks typically employs a two-step hollow forming machine. The principle involves first producing a tube blank, which is then preheated, fed, speed-adjusted, traction-controlled, quality-checked, cut, and stored for later use. Next, the tube blank is heated, placed in a forming mold for axial stretching and radial blow molding, and after cooling and solidification, the mold is opened to remove the product. This forming method has the following problems: 1. High equipment investment costs; 2. The tube blank is susceptible to contamination due to environmental factors during its handling and transportation before secondary heating; 3. The energy consumption of the secondary heating process for tube blanks increases significantly; 4. The tube blank needs to undergo secondary clamping during the turnover and transportation process after secondary heating, which leads to problems such as uneven distribution of parting lines and insufficient appearance of products, resulting in a high scrap rate and low production efficiency.

[0004] In view of this, an internal thread mold structure and an injection blow molding machine are designed to solve the above problems. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides an internal thread mold structure and an injection blow molding machine. This machine employs a three-station, one-step injection blow molding process, resulting in improved product precision and a smooth surface. Furthermore, the three-station synchronous linkage mechanism enables seamless integration of "injection molding → preform transfer → blow molding → finished product removal," maximizing production efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an internal thread mold structure and an injection blow molding machine, comprising a core mold mechanism and a main machine, wherein the core mold mechanism includes a core injection mold mechanism, a bottle mouth mold mechanism, and an injection mold cavity mechanism assembled sequentially from top to bottom; the core injection mold mechanism includes a movable mold, wherein a main plate, a core template, and a core injection pressure plate are fixedly connected sequentially from top to bottom inside the movable mold, wherein a plurality of extrusion mechanisms are assembled at intervals at the bottom end of the core injection pressure plate, and a pushing extrusion mechanism is assembled between the plurality of extrusion mechanisms and the core injection pressure plate, wherein a strip forming device is assembled on the extrusion mechanism. The system includes a threaded full-circumference retraction mechanism, a blow molding mechanism assembled between several extrusion mechanisms and the main board and core template, and a cooling mechanism assembled between several extrusion mechanisms and the main board; the bottle mouth mold mechanism includes a half plate fixed inside the moving mold and located below the core injection plate, the half plate having several grooves evenly spaced inside, and a die fixed inside the grooves, the number of dies being the same as the number of extrusion mechanisms and their positions corresponding one-to-one, the bottom end of the extrusion mechanism extending through the die to the bottom, and the threaded full-circumference retraction mechanism extending into the die; the injection mold cavity mechanism includes a fixed mold.

[0007] Furthermore, the extrusion mechanism includes a plurality of cores evenly spaced below the core-injection plate. A valve stem is movably sleeved around the core. From top to bottom, a core-injection sleeve and a fixed insert are movably sleeved around the valve stem. The fixed insert is fixedly connected to the core-injection sleeve and has a beveled bottom end. The core and valve stem extend through the die to the bottom, and the fixed insert is located inside the die.

[0008] Furthermore, the pushing and extruding mechanism includes lower chambers evenly spaced at the bottom of the core injection plate, an air inlet channel connected to several lower chambers in the upper part of the core injection plate, and an exhaust channel connected to several lower chambers in the lower part of the core injection plate. The number of lower chambers is the same as the number of cores injected, and their positions correspond one-to-one. The bottom end of the core injection plate is provided with grooves on both sides of the lower chambers, and a retaining ring is fixedly connected in the groove. The top of the valve stem passes through the retaining ring and is fixedly connected to the top of the core injection plate. The top of the core injection sleeve passes through the retaining ring and extends into the lower chamber between the air inlet channel and the exhaust channel.

[0009] Furthermore, the full-circumference retraction mechanism with shaped threads includes six slider sleeves evenly spaced along the circumference below the fixed insert. The top of each slider sleeve is elastically connected to the fixed insert via a connecting spring. The slider sleeve has a guide groove near the side wall of the fixed insert that slides with the beveled structure. When the fixed insert slides down, the slider sleeve expands horizontally to form a complete circle. The side wall of the complete circle of the slider sleeve is provided with shaped threads. When the fixed insert slides up, the slider sleeve retracts horizontally inward, and the shaped threads on the side wall of the slider sleeve disengage from the injection-molded internal threads.

[0010] Furthermore, the blow molding mechanism includes several water pipes at the bottom of the main board, several upper chambers at the bottom of the core template, an air guide channel inside the core template connecting the several upper chambers, and an air inlet inside the core template connecting the several upper chambers. The number of water pipes and upper chambers is the same as the number of cores and their positions correspond. The top of the core passes through the lower chamber, through the core injection plate, through the upper chamber, and through the core template to extend into the water pipe. A piston is fixedly sleeved inside the upper chamber of the core, and the piston is located between the air guide channel and the air inlet. A return spring is elastically connected between the piston and the core injection plate outside the core.

[0011] Furthermore, the cooling mechanism includes an oil channel inside the motherboard and a central cavity inside the core, wherein a heat pipe is fixedly connected inside the central cavity and the heat pipe is connected to the oil channel.

[0012] Furthermore, the main unit includes a frame, an injection mechanism, a controller, a core mold mechanism with an internal thread mold structure as described in the preceding claims, a lifting and transporting mechanism, a rotating and transporting mechanism, and a blow molding mechanism. The injection mechanism is mounted on the feeding side at the top of the frame, and the preform forming station, the blow molding station, and the product removal station are arranged at equal angles along the circumference on the discharge side of the top of the frame. The core mold mechanism is initially mounted on the preform forming station, and the blow molding station is equipped with the blow molding mechanism. The lifting and transporting mechanism and the rotating and transporting mechanism are mounted between the core mold mechanism and the frame, so that the core mold mechanism can switch between the preform forming station, the blow molding station, and the product removal station. A controller is fixedly connected to one side of the top of the frame. The injection mechanism includes a sandwich-type barrel fixed to the top of the frame, a communicating hopper fixed to the top of the barrel, a drive motor fixed to the outer wall of the barrel away from the core mold mechanism, several temperature-controlled thermocouples fixed at equal intervals at the top of the barrel, the temperature-controlled thermocouples extending into the barrel, a heating element fixed to the sandwich layer of the barrel, a conveying screw installed inside the barrel, the power end of the conveying screw connected to the drive motor through an injection cylinder, and a communicating injection nozzle fixed to the outer wall of the barrel near the core mold mechanism; the injection nozzle communicates with the fixed mold. The fixed mold of the core mold mechanism is fixedly connected to the preform forming station of the machine frame, and three moving molds are provided and fixedly connected to the rotary transport mechanism at equal intervals along the circumference. The lifting and transporting mechanism includes a fixed template fixed to the top of the frame, a plurality of moving mold hydraulic cylinders fixed at equal intervals along the outer edge of the fixed template, a plurality of moving mold tie columns fixed to the top of the fixed template along the perimeter, a moving template connected to the plurality of moving mold tie columns, the output piston rod of the moving mold hydraulic cylinders fixed to the moving template, a fixed mold base fixed to the top of the plurality of moving mold tie columns, and a mold locking hydraulic cylinder fixed to the middle of the top of the fixed mold base; The rotating transport mechanism includes a rotating motor fixed to the top of the moving template and a rotating plate located below the moving template. The rotating plate is connected to the moving template through a rotating shaft, and the output shaft of the rotating motor is fixed to the rotating shaft. The blow molding mechanism includes a blow molding base fixed to the top of the frame and two lower fixed seats symmetrically fixed to the top of the frame along the blow molding base. Two blow molding side cylinders are symmetrically fixed to the top of the blow molding base. The output shafts of the two blow molding side cylinders are respectively fixed to blow molding dies. The two blow molding dies are combined to form a blow molding die. Locking cylinders are respectively fixed to the side wall away from the core mold mechanism of the lower fixed seats. Blow molding tie columns are fixed to the top of the lower fixed seats. A sealing pneumatic mold base is movably connected to the two blow molding tie columns through openings. A blow molding core is fixed in the middle of the sealing pneumatic mold base. Locking pin holes are symmetrically opened on both sides of the sealing pneumatic mold base. An upper fixed seat is fixed to the top of the two blow molding tie columns. Two blow molding top cylinders are symmetrically fixed to the top of the upper fixed seat. The output shafts of the two blow molding top cylinders are fixed to the sealing pneumatic mold base.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. The internal thread mold structure and injection blow molding machine of the present invention realize the injection molding of internal thread tube blanks of hollow products and the blow molding of hollow products, with low equipment investment cost.

[0014] 2. The internal thread tube blank of the present invention is formed in one step, eliminating the need for transfer and transportation and avoiding the problem of transportation contamination.

[0015] 3. The internal thread tube blank of the present invention is formed in one step, avoiding secondary heating and reducing energy consumption.

[0016] 4. The present invention can form the internal thread tube blank in one step without the need for secondary clamping, the parting line is evenly distributed, the yield is high, and the production efficiency is high.

[0017] 5. This invention sets up a preform forming station, a blow molding station, and a product removal station, and also sets up three core mold mechanisms. The core mold mechanisms are switched between the preform forming station, the blow molding station, and the product removal station by a lifting transport mechanism and a rotating transport mechanism. It adopts a three-station one-step injection-blow molding process to improve the precision of the product and the surface finish. At the same time, the three-station synchronous linkage mechanism realizes the seamless connection of "injection molding → preform transfer → blow molding → finished product removal", which maximizes production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal tooth mold structure of the present invention; Figure 2 This is a three-dimensional schematic diagram of the injection blow molding machine of the present invention; Figure 3 This is a front view schematic diagram of the injection blow molding machine of the present invention; Figure 4This is a schematic diagram of the vertical section of the barrel of the present invention; Figure 5 This is a schematic diagram of the injection molding process of the present invention; Figure 6 This is a side view schematic diagram of the injection blow molding machine of the present invention; Figure 7 This is a schematic diagram showing the locations of the preform forming station, blow molding station, and product removal station in this invention; Figure 8 This is a schematic diagram of the blow molding mechanism of the present invention; Figure 9 This is a schematic diagram of the blow molding process of the present invention; In the diagram: 1. Frame; 2. Injection mechanism; 3. Controller; 4. Core mold mechanism; 5. Lifting and conveying mechanism; 6. Rotating and conveying mechanism; 7. Blow molding mechanism; 201. Drive motor; 202. Hopper; 203. Barrel; 204. Injection nozzle; 205. Heating element; 206. Conveying screw; 207. Temperature control thermocouple; 401. Main board; 402. Water pipe; 403. Upper chamber; 404. Return spring; 405. Core template; 406. Lower chamber; 407. Core injection platen; 408. Retaining ring; 409. Half plate; 410. Connecting spring; 411. Mouth mold; 412. Core injection; 413. Central cavity; 414. Heat pipe; 415. Valve stem; 416. Slider sleeve; 417. Fixing insert; 418. Core injection sleeve; 419. Exhaust channel; 420. Air inlet channel; 421. Air inlet; 422. Piston; 423. Air guide channel; 424. Oil guide channel; 425. Moving mold; 426. Fixed mold; 501. Moving mold hydraulic cylinder; 502. Fixed mold plate; 503. Moving mold plate; 504. Moving mold tie column; 505. Fixed mold base; 506. Mold locking hydraulic cylinder; 601. Rotary motor; 602. Rotating plate; 701. Blow mold base; 702. Blow mold side cylinder; 703. Blow mold die; 704. Blow mold top cylinder; 705. Upper fixed base; 706. Blow mold tie column; 707. Sealing pneumatic mold base; 708. Locking pin hole; 709. Blow mold core; 710. Lower fixed base; 711. Mold locking cylinder. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides the following technical solution: an internal thread mold structure and an injection blow molding machine, comprising a core mold mechanism 4 and a main machine. The core mold mechanism 4 includes a core injection mold mechanism, a bottle mouth mold mechanism, and an injection mold cavity mechanism assembled sequentially from top to bottom. The core injection mold mechanism includes a moving mold 425, inside which a main plate 401, a core template 405, and a core injection pressure plate 407 are fixedly connected sequentially from top to bottom. Several extrusion mechanisms are installed at intervals at the bottom of the core injection pressure plate 407. A pushing extrusion mechanism is installed between the several extrusion mechanisms and the core injection pressure plate 407. A full-circumference inward shrinkage mechanism with forming threads is installed on the extrusion mechanism. A blow molding mechanism is assembled between the dry extrusion mechanism, the main board 401, and the core template 405. A cooling mechanism is assembled between several extrusion mechanisms and the main board 401. The bottle mouth mold mechanism includes a half plate 409 fixed inside the moving mold 425 and located below the core injection plate 407. Several grooves are equally spaced inside the half plate 409, and a die 411 is fixed inside the groove. The number of dies 411 is the same as the number of extrusion mechanisms and their positions correspond one-to-one. The bottom end of the extrusion mechanism extends through the die 411 and downwards. A full-circumference inward shrinkage mechanism with forming threads extends into the die 411. The injection mold cavity mechanism includes a fixed mold 426.

[0021] Specifically, the extrusion mechanism includes a plurality of core injections 412s arranged at equal intervals below the core injection plate 407. A valve stem 415 is movably sleeved on the outside of the core injection 412. A core injection sleeve 418 and a fixed insert 417 are movably sleeved on the outside of the valve stem 415 from top to bottom. The fixed insert 417 is fixedly connected to the core injection sleeve 418 and has a beveled structure at its bottom end. The core injections 412 and the valve stem 415 extend through the die 411 to the bottom, and the fixed insert 417 is located inside the die 411.

[0022] Specifically, the extrusion mechanism includes lower chambers 406 evenly spaced at the bottom of the core injection plate 407, an air inlet channel 420 connected to several lower chambers 406 located in the upper part of the core injection plate 407, and an exhaust channel 419 connected to several lower chambers 406 located in the lower part of the core injection plate 407. The number of lower chambers 406 is the same as the number of core injections 412, and their positions correspond one-to-one. The bottom end of the core injection plate 407 is provided with grooves on both sides of the lower chambers 406, and a retaining ring 408 is fixedly connected in the groove. The top end of the valve stem 415 passes through the retaining ring 408 and is fixedly connected to the top end of the core injection plate 407. The top end of the core injection sleeve 418 passes through the retaining ring 408 and extends into the lower chamber 406, located between the air inlet channel 420 and the exhaust channel 419.

[0023] Specifically, the full-circumference retraction mechanism with shaped threads includes six slider sleeves 416 evenly spaced along the circumference below the fixed insert 417. The top of the slider sleeve 416 is elastically connected to the fixed insert 417 via a connecting spring 410. The slider sleeve 416 has a guide groove on its side wall near the fixed insert 417 that slides with the inclined structure. When the fixed insert 417 slides down, the slider sleeve 416 horizontally expands outward to form a complete circle. The side wall of the complete circle of the slider sleeve 416 is provided with shaped threads. When the fixed insert 417 slides up, the slider sleeve 416 horizontally retracts inward, and the shaped threads on the side wall of the slider sleeve 416 disengage from the injection-molded internal thread.

[0024] Specifically, the blow molding mechanism includes several water pipes 402 at the bottom of the main plate 401, several upper chambers 403 at the bottom of the core template 405, air channels 423 connected to the upper chambers 403 inside the core template 405, and air inlets 421 connected to the upper chambers 403 inside the core template 405. The number of water pipes 402 and upper chambers 403 is the same as the number of injection cores 412 and their positions correspond. The top of the injection core 412 passes through the lower chamber 406, through the injection pressure plate 407, through the upper chamber 403, and through the core template 405, extending into the water pipes 402. The injection core 412 is fixedly sleeved with a piston 422 inside the upper chamber 403. The piston 422 is located between the air channels 423 and the air inlets 421. A return spring 404 is elastically connected between the piston 422 and the injection pressure plate 407 outside the injection core 412.

[0025] Specifically, the cooling mechanism includes an oil channel 424 inside the main board 401 and a central cavity 413 inside the core 412. A heat pipe 414 is fixed inside the central cavity 413 and is connected to the oil channel 424.

[0026] Specifically, the main unit includes a frame 1, an injection mechanism 2, a controller 3, a core mold mechanism 4, a lifting and transporting mechanism 5, a rotating transporting mechanism 6, and a blow molding mechanism 7. The injection mechanism 2 is installed on the feeding side at the top of the frame 1. The preform forming station, the blow molding station, and the product removal station are set at equal angles along the circumference on the discharge side at the top of the frame 1. The core mold mechanism 4 is initially installed at the preform forming station. The blow molding station is equipped with the blow molding mechanism 7. The lifting and transporting mechanism 5 and the rotating transporting mechanism 6 are installed between the core mold mechanism 4 and the frame 1, so that the core mold mechanism 4 can switch between the preform forming station, the blow molding station, and the product removal station. The controller 3 is fixedly connected to one side of the top of the frame 1. The injection mechanism 2 includes a sandwich-type barrel 203 fixed to the top of the frame 1. A hopper 202 is fixed to the top of the barrel 203. A drive motor 201 is fixed to the outer wall of the barrel 203 away from the core mold mechanism 4. Several temperature control thermocouples 207 are fixed at equal intervals to the top of the barrel 203. The temperature control thermocouples 207 extend into the interior of the barrel 203. A heating element 205 is fixed inside the sandwich layer of the barrel 203. A conveying screw 206 is provided inside the barrel 203. The power end of the conveying screw 206 is connected to the drive motor 201 through an injection cylinder. An injection nozzle 204 is fixed to the outer wall of the barrel 203 near the core mold mechanism 4. The injection nozzle 204 is connected to the fixed mold 426. The fixed mold 426 of the core mold mechanism 4 is fixedly connected to the preform forming station of the frame 1, and three moving molds 425 are provided and fixedly connected to the rotary transport mechanism 6 at equal intervals along the circumference. The lifting and transporting mechanism 5 includes a fixed template 502 fixedly connected to the top of the frame 1. Several moving mold hydraulic cylinders 501 are fixedly connected at equal intervals along the circumference of the outer edge of the fixed template 502. Several moving mold tie columns 504 are fixedly connected to the top of the fixed template 502 along the perimeter. Moving templates 503 are connected to the several moving mold tie columns 504. The output piston rod of the moving mold hydraulic cylinders 501 is fixedly connected to the moving template 503. A fixed mold base 505 is fixedly connected to the top of the several moving mold tie columns 504. A locking mold hydraulic cylinder 506 is fixedly connected to the middle of the top of the fixed mold base 505. The rotating transport mechanism 6 includes a rotating motor 601 fixedly connected to the top of the moving template 503 and a rotating plate 602 located below the moving template 503. The rotating plate 602 is connected to the moving template 503 through a rotating shaft, and the output shaft of the rotating motor 601 is fixedly connected to the rotating shaft. The blow molding mechanism 7 includes a blow molding base 701 fixedly connected to the top of the frame 1 and two lower fixed seats 710 symmetrically fixedly connected to the top of the frame 1 along the blow molding base 701. Two blow molding side cylinders 702 are symmetrically fixedly connected to the top of the blow molding base 701. The output shafts of the two blow molding side cylinders 702 are respectively fixedly connected to blow molds 703. The two blow molds 703 are combined to form a blow molding die. Locking cylinders 711 are respectively fixedly connected to the side wall of the lower fixed seats 710 away from the core mold mechanism 4. The top of the lower fixed seats 710 is fixedly fixedly connected to the core mold mechanism 4. The device is equipped with two blow mold columns 706. A sealing pneumatic mold base 707 is movably connected to the two blow mold columns 706 through openings. A blow mold core 709 is fixed in the middle of the sealing pneumatic mold base 707. Locking pin holes 708 are symmetrically opened on both sides of the sealing pneumatic mold base 707. An upper fixed seat 705 is fixedly connected to the top of the two blow mold columns 706. Two blow mold top cylinders 704 are symmetrically fixed to the top of the upper fixed seat 705. The output shafts of the two blow mold top cylinders 704 are fixedly connected to the sealing pneumatic mold base 707.

[0027] Working principle of the invention: Several moving mold hydraulic cylinders 501 drive the output shaft to move downward, causing the moving mold plate 503 to move downward on several moving mold tie pillars 504. The moving mold plate 503 drives the moving mold 425 to move downward until the set driving time is reached and then stops. At this time, the moving mold 425 and the fixed mold 426 close the mold. High-pressure gas enters the lower chamber 406 through the air inlet 420, pushing the core injection sleeve 418 to move downward on the valve stem 415. The core injection sleeve 418 drives the fixed insert 417 to move downward on the valve stem 415. During the downward movement of the fixed insert 417, due to the inclined surface cooperation between the structures, the six slider sleeves 416 are driven to expand outward, forming an internal thread tube blank forming cavity with the die 411. At the same time, the six slider sleeves 416 are provided with forming threads. The locking hydraulic cylinder 506 drives the output shaft to move downward until it stops after the set driving time. At this time, the output shaft presses against the moving mold 425 position on the rotating plate 602, thus locking the mold. Plastic granules in hopper 202 enter barrel 203 and are melted into a gel-like fluid by the high temperature generated by heating element 205 in barrel 203. The fluid is then conveyed to fixed mold 426 by conveying screw 206 driven by drive motor 201 to obtain tube blank with inner teeth of bottle mouth, and then held under pressure and cooled. The output shaft of the 506 mold-locking hydraulic cylinder is reset. Several moving mold hydraulic cylinders 501 drive the output shaft to move upward, causing the moving mold plate 503 to move upward on several moving mold tie pillars 504. The moving mold plate 503 drives the moving mold 425 to move upward until the set driving time is reached and stops. At this time, the moving mold 425 and the internal thread tube blank obtained by injection molding and tightly wrapped on the core 412 are separated from the fixed mold 426 and move upward to the set height. The rotary motor 601 drives the output shaft to rotate, the output shaft drives the rotary plate 602 to rotate, and the rotary plate 602 drives the moving mold 425 and the internal thread tube preform obtained by injection molding and tightly wrapped on the injection core 412 to rotate until the set driving time is reached and then stops. At this time, the internal thread tube preform obtained by injection molding and tightly wrapped on the injection core 412 rotates from the preform forming station to the blow molding station. Two blow mold side cylinders 702 drive the output shaft to move away from each other, causing the two blow molds 703 to move away from each other until the set driving time is reached and they stop. At this time, the mold opens. Several moving mold hydraulic cylinders 501 drive the output shaft to move downward, causing the moving mold 425 and the internal thread tube blank tightly wrapped on the injection core 412 to move downward until the set driving time is reached and they stop. At this time, the internal thread tube blank tightly wrapped on the injection core 412 is located between the two blow molds 703. The two blow mold side cylinders 702 drive the output shaft to move closer to each other, causing the two blow molds 703 to move closer to each other until the set driving time is reached and they stop. At this time, the mold closes. Two blow mold top cylinders 704 drive the output shaft to move downward, causing the sealing pneumatic mold base 707 to move downward on the two blow mold tie pillars 706. The sealing pneumatic mold base 707 drives the blow mold core 709 to move downward until the set driving time is reached and it stops. At this time, the air passage of the blow mold core 709 is connected to the air guide channel 423. Two mold locking cylinders 711 drive the output shaft to extend until the set driving time is reached and it stops. At this time, the two mold locking cylinders 711 are inserted into the two locking pin holes 708 to lock the mold. High-pressure gas enters the upper chamber 403 through the air guide channel 423, compressing the piston 422 to move downward and driving the injection core 412 to move downward, pushing open the air guide channel set between the valve stem 415 and the injection core 412; another stream of high-pressure gas introduced by the blow molding core 709 enters the space below the piston 422 in the upper chamber 403 through the air inlet 421, and the high-pressure gas blows the internal thread tube blank along the air guide channel to achieve blow molding; Two clamping cylinders 711 drive the output shaft to retract until the set driving time is reached and then stop. At this time, the two clamping cylinders 711 disengage from the two locking pin holes 708, the clamping is released, and the two blow mold top cylinders 704 drive the output shaft to move upward, which drives the sealing pneumatic mold base 707 to move upward on the two blow mold tie pillars 706. The sealing pneumatic mold base 707 drives the blow mold core 709 to move upward until the set driving time is reached and then stop. At this time, the blow mold core 709 resets and the blowing operation stops. The high-pressure gas delivered through the air guide channel 423 stops being delivered, and the piston 422 is reset by the reset force of the reset spring 404, which drives the injection core 412 to move upward, and the air guide channel between the valve stem 415 and the injection core 412 is closed. The oil enters the heat pipe 414 through the oil guide channel 424, and then enters the central cavity 413 through the heat pipe 414. When the central cavity 413 is full, it flows out through another oil guide channel, circulating and supplying oil to carry away the high temperature for cooling. The two blow mold side cylinders 702 drive the output axis to move away from each other, which in turn drives the two blow molds 703 to move away from each other until the set driving time is reached and then the mold is opened. Several moving mold hydraulic cylinders 501 drive the output shaft to move upward, causing the moving mold plate 503 to move upward on several moving mold tie pillars 504. The moving mold plate 503 drives the moving mold 425 to move upward until the set driving time is reached and stops. At this time, the moving mold 425 and the internal thread tube blank obtained by blow molding and tightly wrapped on the core injection 412 are separated from the two blow molds 703 and move upward to the set height. The rotary motor 601 drives the output shaft to rotate, the output shaft drives the rotary plate 602 to rotate, and the rotary plate 602 drives the moving mold 425 and the blow-molded internal thread tube blank tightly wrapped on the injection core 412 to rotate until the set driving time is reached and then stops. At this time, the blow-molded internal thread tube blank tightly wrapped on the injection core 412 rotates from the blow molding station to the product removal station. Several moving mold hydraulic cylinders 501 drive the output shaft to move downward, causing the moving mold plate 503 to move downward on several moving mold tie pillars 504. The moving mold plate 503 drives the moving mold 425 to move downward until the set driving time is reached and stops. At this time, the moving mold 425 and the blow-molded internal thread tube blank tightly wrapped on the injection core 412 move downward to the set height. The high-pressure gas inside the lower chamber 406 is controlled to be discharged through the exhaust port 419. The core sleeve 418 loses the pressure of the high-pressure gas and moves upward on the valve stem 415 under the reset force of the connecting spring 410. The core sleeve 418 drives the fixed insert 417 to move upward on the valve stem 415. During the upward movement of the fixed insert 417, due to the inclined surface cooperation between the structures, the six slider sleeves 416 are driven to retract inward, so that the inner thread of the bottle mouth of the plastic bottle product is released from the inner thread tube blank forming cavity formed between the six slider sleeves 416 and the die 411, thus completing the demolding work. In the above process, while the preform is being injection molded at the preform forming station, the blow molding station blows the bottle, and the product removal station removes the bottle. This cycle is repeated to achieve three-station injection blow molding.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An inner mold structure and injection blow hollow molding machine, characterized by, The utility model provides a core mould mechanism (4) and host computer, the core mould mechanism (4) includes the core mould mechanism of assembly from top to bottom in proper order, bottle mouth mould mechanism and injection mould cavity mechanism, the core mould mechanism includes movable die (425), the movable die (425) inside from top to bottom fixedly connected with mainboard (401), core mould plate (405) and core injection platen (407) in proper order, the core injection platen (407) bottom end interval spacing assembly has a plurality of extrusion mechanism, a plurality of extrusion mechanism and core injection platen (407) interval assembly has the push extrusion mechanism, the extrusion mechanism is assembled with the full week inside shrinkage mechanism of thread forming on, a plurality of extrusion mechanism and mainboard (401) and core mould plate (405) interval assembly has blow molding mechanism, a plurality of extrusion mechanism and mainboard (401) interval assembly cooling mechanism, the bottle mouth mould mechanism includes the half plate (409) of fixedly connected in movable die (425) inside and located below core injection platen (407), the half plate (409) inside equal interval spacing is set with a plurality of groove bodies and is fixedly connected with mouth mould (411) in groove body, and the number of mouth mould (411) is same with the number of extrusion mechanism and position one to one correspondence, and extrusion mechanism bottom end passes through mouth mould (411) and extends to below, and the full week inside shrinkage mechanism of thread forming extends to mouth mould (411) in, the injection mould cavity mechanism includes fixed die (426).

2. The inner mold structure and injection blow molding machine according to claim 1, characterized by: The extrusion mechanism includes a plurality of core injection (412) that are equally spaced below the core injection platen (407), the valve rod (415) is movably sleeved outside the core injection (412), the fixed embedding needle (417) and the core injection sleeve (418) are movably sleeved outside the valve rod (415) from top to bottom, the fixed embedding needle (417) is fixedly connected with the core injection sleeve (418) and is provided with an inclined structure at the bottom end, the core injection (412) and the valve rod (415) extend to the lower side through the mouth mould (411), and the fixed embedding needle (417) is located in the mouth mould (411).

3. The inner mold structure and injection blow molding machine according to claim 2, characterized by: The push extrusion mechanism includes a plurality of lower chambers (406) that are equally spaced at the bottom of the core injection platen (407), the air inlet channel (420) that is arranged in the upper part of the core injection platen (407) and communicates with the plurality of lower chambers (406), and the air outlet channel (419) that is arranged in the lower part of the core injection platen (407) and communicates with the plurality of lower chambers (406), the number of the lower chambers (406) is same with the number of the core injection (412) and position one to one correspondence, the core injection platen (407) is provided with a plurality of grooves at the bottom end, and the grooves are fixedly connected with the retaining rings (408), the valve rod (415) is fixedly connected with the top end of the core injection platen (407) through the retaining rings (408), and the core injection sleeve (418) extends to the lower chamber (406) through the retaining rings (408) and is located between the air inlet channel (420) and the air outlet channel (419).

4. The inner mold structure and injection blow molding machine according to claim 3, wherein: The full circumference inner shrink mechanism with formed thread comprises six slider sleeves (416) equidistantly arranged below the fixed insert pin (417) in the circumferential direction, the top end of the slider sleeve (416) is elastically connected with the fixed insert pin (417) through a connecting spring (410), a guide groove sliding with a beveled structure is arranged on the side wall of the slider sleeve (416) close to the fixed insert pin (417), the slider sleeve (416) horizontally expands to form a whole circle when the fixed insert pin (417) slides downward, the side wall of the slider sleeve (416) is provided with a formed thread, and the slider sleeve (416) horizontally shrinks inward when the fixed insert pin (417) slides upward, and the formed thread of the side wall of the slider sleeve (416) is separated from the inner tooth thread formed by injection molding.

5. The inner mold structure and injection blow molding machine according to claim 4, wherein: The blowing mechanism comprises a plurality of water conveying pipes (402) opened at the bottom end of the main plate (401), a plurality of upper chambers (403) opened at the bottom end of the core mold plate (405), a gas guide channel (423) opened in the inside of the core mold plate (405) and communicating with the plurality of upper chambers (403) upward, and a gas inlet (421) opened in the inside of the core mold plate (405) and communicating with the plurality of upper chambers (403) downward, the number and positions of the water conveying pipes (402) and the upper chambers (403) correspond to the number of the injection cores (412), the top end of the injection core (412) extends into the water conveying pipe (402) by penetrating through the lower chamber (406), the injection core pressing plate (407), the upper chamber (403) and the core mold plate (405), the injection core (412) is fixedly sleeved with a piston (422) in the inside of the upper chamber (403), the piston (422) is located between the gas guide channel (423) and the gas inlet (421), and the injection core (412) is elastically connected with a reset spring (404) between the piston (422) and the injection core pressing plate (407) outward.

6. An inner mold structure and injection blow molding machine according to claim 5, wherein: The cooling mechanism comprises a oil guide channel (424) opened in the inside of the main plate (401) and a central cavity (413) opened in the inside of the injection core (412), and the central cavity (413) is fixedly connected with a heat conduction pipe (414) in the inside.

7. The inner mold structure and injection blow hollow molding machine according to claim 6, wherein The main machine comprises a rack (1), an injection mechanism (2), a controller (3), a core mold mechanism (4) of the inner tooth mold structure as claimed in claim 5, a lifting transportation mechanism (5), a rotating transportation mechanism (6) and a blowing mold mechanism (7), the injection mechanism (2) is assembled on the feeding side of the top end of the rack (1), the bottle blank forming station, the blow molding station and the product taking-out station are arranged at equal angles in the circumferential direction on the discharging side of the top end of the rack (1), the core mold mechanism (4) is initially assembled in the bottle blank forming station, the blowing mold mechanism (7) is assembled in the blow molding station, the lifting transportation mechanism (5) and the rotating transportation mechanism (6) are assembled between the core mold mechanism (4) and the rack (1), so that the core mold mechanism (4) is switched between the bottle blank forming station, the blow molding station and the product taking-out station, and the controller (3) is fixedly connected to one side of the top end of the rack (1). The injection mechanism (2) comprises a sandwich type machine barrel (203) fixed at the top end of the rack (1), a communicating hopper (202) is fixed at the top end of the machine barrel (203), a driving motor (201) is fixed at the outer wall of the machine barrel (203) away from the core mold mechanism (4), a plurality of temperature control thermocouples (207) are fixed at the top end of the machine barrel (203) at equal intervals, the temperature control thermocouples (207) extend into the machine barrel (203), heating elements (205) are fixed in the sandwich layer of the machine barrel (203), a conveying screw (206) is arranged in the machine barrel (203), the power end of the conveying screw (206) is connected with the driving motor (201) through an injection oil cylinder, and a communicating injection nozzle (204) is fixed on the outer wall of the machine barrel (203) close to the core mold mechanism (4); the injection nozzle (204) communicates with the fixed mold (426); The fixed mold (426) of the core mold mechanism (4) is fixed on the bottle blank forming station of the rack (1), the movable mold (425) is provided with three and is fixed on the rotating transportation mechanism (6) at equal intervals in the circumferential direction; The lifting transportation mechanism (5) comprises a fixed mold plate (502) fixed at the top end of the rack (1), a plurality of movable mold hydraulic oil cylinders (501) are fixed at equal intervals in the circumferential direction at the outer edge of the fixed mold plate (502), a plurality of movable mold corinth columns (504) are fixed at the top end of the fixed mold plate (502) in the periphery, a movable mold plate (503) is connected to the movable mold corinth columns (504), the output piston rod of the movable mold hydraulic oil cylinder (501) is fixed with the movable mold plate (503), a fixed mold seat (505) is fixed at the top end of the movable mold corinth columns (504), and a locking hydraulic oil cylinder (506) is fixed at the top end of the fixed mold seat (505); The rotating transportation mechanism (6) comprises a rotating motor (601) fixed at the top end of the movable mold plate (503) and a rotating plate (602) located below the movable mold plate (503), the rotating plate (602) is connected with the movable mold plate (503) through a rotating shaft, and the output shaft of the rotating motor (601) is fixed with the rotating shaft; The blowing mechanism (7) comprises a blowing seat (701) fixed at the top end of the frame (1), two lower fixed seats (710) fixed symmetrically at the top end of the frame (1) along the blowing seat (701), two blowing side cylinders (702) fixed symmetrically at the top end of the blowing seat (701), blowing tools (703) fixed respectively on the output shafts of the two blowing side cylinders (702), a blowing mold formed by combining the two blowing tools (703), a locking cylinder (711) fixed respectively on the lower fixed seat (710) away from the side wall of the core mechanism (4), blowing columns (706) fixed at the top end of the lower fixed seat (710), a sealing pneumatic mold seat (707) movably connected through a hole sleeve on the two blowing columns (706), a blowing core (709) fixed in the sealing pneumatic mold seat (707), locking pin holes (708) symmetrically formed on the two sides of the sealing pneumatic mold seat (707), an upper fixed seat (705) fixed at the top end of the two blowing columns (706), two blowing top cylinders (704) fixed symmetrically at the top end of the upper fixed seat (705), and the output shafts of the two blowing top cylinders (704) are fixed with the sealing pneumatic mold seat (707).

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