Bottle body blow molding machine

Abstract

The invention relates to the technical field of bottle body blow molding machines, in particular to a bottle body blow molding machine. The device comprises a rack, a mounting plate is arranged on the rack, an injection mold and a blow molding mold are arranged on the mounting plate, a lifting frame is slidably arranged on the mounting plate, a rotating disc assembly is slidably clamped to the middle of the lifting frame, and at least three mold nozzle assemblies are arranged on the rotating disc assembly; a first servo motor and a speed reducer are arranged in the rack, an output shaft of the first servo motor is fixedly connected with the input end of the speed reducer, and a lead screw is arranged at the output end of the speed reducer. The first servo motor, the speed reducer and the lead screw form the power device used for driving the lifting frame to slide up and down on the rack, so that the mold nozzle assembly is matched with an injection mold at constant mold locking pressure under the transmission of the rotating disc assembly, and the situation that the mold nozzle assembly is not stable when voltage is unstable is avoided. The problems of deformation, non-uniform wall thickness, unstable bottle opening size and the like of the bottle blank due to unstable mold locking pressure are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of blow molding machines, and more particularly to a bottle blow molding machine. Background Art

[0002] Most beverage bottles on the market are produced by blow molding machines. Blow molding machines are machines that extrude or injection mold thermoplastic resins or plastics to obtain tubular preforms, which are then placed in split molds after being heated to a softened state. After the mold clamping mechanism drives the mold to close, compressed air is immediately introduced into the preforms to inflate the plastic preforms and stick to the inner wall of the mold. After cooling and demolding, various hollow products are made.

[0003] In the existing blow molding machine, the hydraulic device is mainly used to lock the injection mold during the preform molding stage (see CN204431711 U). Although a large clamping pressure can be obtained, the hydraulic device is easily affected by voltage. When the voltage is too high or too low, the clamping pressure will change, causing the mold to shake or shift, resulting in deformation of the bottle body, uneven wall thickness and other problems.

[0004] That is to say, the stability of the method of clamping the injection mold using a hydraulic device (generally composed of a motor, a hydraulic pump, and a cylinder) is poor and needs to be improved. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a bottle blow molding machine for solving the problem that the clamping pressure of the prior blow molding machine is unstable during the injection molding stage.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A bottle blow molding machine comprises a frame, a mounting plate is arranged on the frame, an injection mold for molding a bottle blank and a blow mold for blowing the bottle blank into a bottle body are arranged on the mounting plate, a lifting frame sliding in a vertical direction is slidably arranged on the mounting plate, a turntable assembly is slidably engaged in the middle of the lifting frame, and at least three groups of die nozzle assemblies for adapting to the injection mold to thermoform plastic into a bottle blank and conveying the bottle blank to the blow molding mold are arranged on the turntable assembly; a first servo motor and a reducer are arranged in the frame, the output shaft of the first servo motor is fixedly connected to the input end of the reducer, and a screw rod for driving the lifting frame to slide up and down is arranged at the output end of the reducer, and the screw rod is threadedly connected to the lower end of the lifting frame; the lower end of the lifting frame is located below the mounting plate, and the upper end thereof is located above the mounting plate.

[0008] Optionally, the lifting frame includes an upper end plate located above the mounting plate, a lower end plate located below the mounting plate, and four guide columns slidably connected to the mounting plate; the guide columns penetrate the mounting plate, and their upper ends are fixedly connected to the upper end plate, and their lower ends are fixedly connected to the lower end plate; the turntable assembly is slidably mounted on the guide columns, and is located between the mounting plate and the upper end plate.

[0009] Optionally, the turntable assembly includes a turntable seat, a turntable is rotatably arranged on the lower end surface of the turntable seat, a second servo motor for driving the turntable to rotate is arranged on the upper end surface of the turntable seat, and quick-release locking parts for locking the die nozzle assembly on the turntable are arranged in an evenly spaced circular array on the lower end surface of the turntable, and the quick-release locking parts slide and engage the die nozzle assembly; the output shaft of the second servo motor passes through the turntable seat and is fixedly connected to the turntable; four linkage rods are arranged on the upper end surface of the turntable seat for driving the turntable seat to move up and down with the lifting frame, and the end of the linkage rod away from the turntable seat slides and engages with the upper end plate; a number of limit columns are arranged on the turntable seat to prevent the turntable seat from abutting against the upper end plate.

[0010] Optionally, the quick-release locking part includes two fixed blocks respectively located at one end and the other end of the die nozzle assembly, connecting bolts are provided at both ends of the fixed blocks, and a slider for movably engaging the die nozzle assembly is slidably provided in the middle of the fixed block, and connecting through holes for accommodating the connecting bolts are provided at both ends of the slider; the connecting bolts are fixed to the fixed block after passing through the connecting through holes; a spring for driving the slider to engage the die nozzle assembly is accommodated in the connecting through holes, and the spring is sleeved with the connecting bolt; one end of the spring presses against the connecting bolt, and the other end presses against the slider; the fixed block is fixedly connected to the turntable and is slidably connected to the die nozzle assembly.

[0011] Optionally, the die nozzle assembly includes a separate connecting plate, on which a mouth mold is provided for adapting to the injection mold to thermoform the plastic into a preform and fixedly conveying the preform to the blow mold under the action of the turntable, and a core rod is provided on the mouth mold for extending out of the inner space of the preform; both ends of the separate connecting plate are provided with a slot corresponding to the slider, and the slider is movably connected in the slot;

[0012] An inclined hole is provided on the slider, a core-changing cylinder is provided on the turntable seat, and an inclined pin is provided on the output shaft of the core-changing cylinder for movably inserting into the inclined hole and driving the slider away from the die nozzle assembly so that the die nozzle assembly is switched from a locked state to an unlocked state. The inclined pin passes through the turntable seat and the turntable in sequence.

[0013] Optionally, a gas nozzle head for inputting compressed air into the core rod is disposed on the lower end surface of the upper end plate, and the gas nozzle head is movably pressed against and seals the top opening of the core rod.

[0014] Optionally, a stretching cylinder is arranged on the upper end plate, and a stretching rod is arranged on the movable end of the stretching cylinder for movably extending into the interior of the bottle blank to stretch it; the fixed end of the stretching cylinder is fixedly connected to the upper end plate; the stretching rod penetrates the upper end plate, the nozzle head, the turntable seat, the turntable and the core rod from top to bottom in sequence, and then is inserted into the interior of the bottle blank to stretch the bottle blank.

[0015] Optionally, it also includes a water-liquid solenoid valve; a cooling water circuit is opened in the injection mold, the water inlet of the cooling water circuit is connected to the water outlet of the water-liquid solenoid valve, the water outlet of the cooling water circuit is connected to the return water port of the external water transport mechanism, and the water inlet of the water-liquid solenoid valve is connected to the water outlet of the external water transport mechanism.

[0016] Optionally, the water liquid solenoid valve is a normally closed solenoid valve.

[0017] Optionally, the injection mold is a hot runner mold.

[0018] The above-mentioned embodiments of the present invention have the following beneficial effects compared with the prior art: a power device composed of a first servo motor, a reducer, and a screw rod is used to drive the lifting frame to slide up and down on the frame, so that the die nozzle assembly is adapted to the injection mold with a constant clamping pressure under the transmission of the turntable assembly, thereby avoiding deformation of the bottle blank, uneven wall thickness, unstable bottle mouth size, etc. due to unstable clamping pressure when the voltage is unstable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the lifting frame, the turntable assembly and the die nozzle assembly in the present invention;

[0021] Figure 3 yes Figure 2 The main view;

[0022] Figure 4 yes Figure 2 A top view of

[0023] Figure 5 yes Figure 4 Cross-sectional view at section FF;

[0024] Figure 6 It is a structural schematic diagram of a turntable assembly and a die nozzle assembly in the present invention;

[0025] Figure 7 yes Figure 6 A first partial structural schematic diagram of;

[0026] Figure 8 yes Figure 6 A second partial structural schematic diagram;

[0027] Fig. 9 yes Figure 6 A top view of

[0028] Fig.10 yes Fig. 9 Cross-sectional view at section EE;

[0029] Fig.11 It is a structural schematic diagram of the quick-release locking member in the present invention;

[0030] Fig.12 It is a structural schematic diagram of the die nozzle assembly in the present invention;

[0031] Fig.13 is a side view of the die nozzle assembly of the present invention;

[0032] Fig.14 yes Fig.13 Cross-sectional view at section GG; DETAILED DESCRIPTION

[0033] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. Several embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0034] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] The present invention provides a bottle blow molding machine such as Figure 1-14 As shown, it includes a frame 1, a mounting plate 11 is arranged on the frame 1, an injection mold 2 for forming a bottle blank and a blow mold 3 for blowing the bottle blank into a bottle body are arranged on the mounting plate 11, a lifting frame 4 sliding in the vertical direction is slidably arranged on the mounting plate 11, a turntable assembly 5 is slidably engaged in the middle of the lifting frame 4, and at least three groups of die nozzle assemblies 6 for adapting to the injection mold 2 to thermoform the plastic into a bottle blank and conveying the bottle blank to the blow mold 3 are arranged on the turntable assembly 5; a first servo motor 12 and a reducer 13 are arranged in the frame 1, the output shaft of the first servo motor 12 is fixedly connected to the input end of the reducer 13, and a screw rod 14 for driving the lifting frame 4 to slide up and down is arranged at the output end of the reducer 13, and the screw rod 14 is threadedly connected to the lower end of the lifting frame 4; the lower end of the lifting frame 4 is located below the mounting plate 11, and the upper end thereof is located above the mounting plate 11.

[0036] In this embodiment, the mounting plate 1 is mounted on the left end of the frame 1, and the injection molding machine (not shown in the figure) is mounted on the right end of the frame 1. The injection mold 2 is mounted on the right end of the mounting plate 1, and the blow mold 3 is mounted on the left end of the mounting plate 1. The lifting frame 4 is mounted on the mounting plate 11 in a sliding manner in the vertical direction, and is slidably connected to the frame 1. The turntable assembly 5 is mounted on the lifting frame 4 in a sliding and clamping manner in the vertical direction; four die nozzle assemblies 6 are mounted in an equally spaced circular array on the lower end surface of the turntable assembly 5. The first servo motor 12, the reducer 13 and the screw rod 14 are mounted inside the frame 1, and the first servo motor 12 drives the lifting frame 4 to move up and down through the transmission action of the reducer 13 and the screw rod 14; on the premise that the power of the first servo motor 12 meets the use requirements, the reducer 13 can be omitted, and the output shaft of the first servo motor 12 is directly fixed together with the screw rod 14 and arranged coaxially, or the output shaft of the first servo motor 12 drives the screw rod 14 to rotate through the reversing structure.

[0037] The present invention utilizes a first servo motor 12, a reducer 13, and a screw rod 14 to form a power device for driving the lifting frame 4 to slide up and down on the frame 1, so that the die nozzle assembly 6 is adapted to the injection mold 2 with a constant clamping pressure under the transmission of the turntable assembly 6, thereby avoiding the problems of deformation, uneven wall thickness, unstable bottle mouth size, etc. caused by unstable clamping pressure when the voltage is unstable.

[0038] In addition, for the same stroke, the servo-driven lifting frame 4 takes a shorter time to lift (eg, the hydraulic time may be 5 seconds, while the servo time only takes 2-3 seconds), thereby improving production speed, increasing output, and reducing energy consumption.

[0039] Furthermore, the lifting frame 4 includes an upper end plate 41 located above the mounting plate 11, a lower end plate 42 located below the mounting plate 11, and four guide columns 43 slidably connected to the mounting plate 11; the guide columns 43 penetrate the mounting plate 11, and their upper ends are fixedly connected to the upper end plate 41, and their lower ends are fixedly connected to the lower end plate 42; the turntable assembly 5 is slidably sleeved on the guide columns 43, and is located between the mounting plate 11 and the upper end plate 41.

[0040] Furthermore, the turntable assembly 5 includes a turntable seat 51, a turntable 52 is rotatably arranged on the lower end surface of the turntable seat 51, a second servo motor 53 for driving the turntable 52 to rotate is arranged on the upper end surface of the turntable seat 51, and four groups of quick-release locking members 54 for locking the die nozzle assembly 6 on the turntable 52 are arranged in an evenly spaced circular array on the lower end surface of the turntable 52, and the quick-release locking members 54 are slidably engaged with the die nozzle assembly 6; the output shaft of the second servo motor 53 passes through the turntable seat 51 and is fixedly connected with the turntable 52; four linkage rods 511 are arranged on the upper end surface of the turntable seat 51 for driving the turntable seat 51 to move up and down with the lifting frame 4, and the end of the linkage rod 511 away from the turntable seat 51 is slidably engaged with the upper end plate 41; a plurality of limit columns 51212 are arranged on the turntable seat 51 for preventing the turntable seat 51 from abutting against the upper end plate 41.

[0041] like Figure 1-7 As shown, the four guide pillars 43 are respectively located at the four end corners of the upper end plate 41, the upper ends of the four guide pillars 43 are fixedly connected to the upper end plate 41 by screws, and the lower ends of the four guide pillars 43 are fixedly connected to the lower end plate 42 by screws; a through hole corresponding to the guide pillar 43 is opened on the turntable seat 51, and the guide pillar 43 is sleeved through the through hole, so that the turntable seat 51 can slide between the upper end plate 41 and the lower end plate 42; a second servo motor 53 is installed in the middle of the upper end surface of the turntable seat 51, and the output shaft of the second servo motor 53 penetrates downward through the turntable seat 51 and is fixedly connected to the turntable 52 in an existing manner; in order to enhance the stability of the turntable 52, the turntable 52 can also be installed on the lower end surface of the turntable seat 51 in a rotatable connection through a load-bearing bearing; in general, under the transmission of the second servo motor 53, the turntable 52 and the turntable seat 51 are in a rotatable connection relationship with each other.

[0042] The lower end surface of the turntable 52 is provided with four stations in an evenly spaced circular array, each station is fixed with a quick-release locking assembly 54 by bolts, and the turntable 52 is provided with four die nozzle assemblies 6 by the quick-release locking member 54, and the four die nozzle assemblies 6 correspond to the injection molding station, the heating station (this station can be omitted for the preforms that do not need to be heated), the blow molding station, and the take-out station respectively; the injection molding station, the heating station, the blow molding station, and the take-out station correspond respectively Fig. 9The A, D, B, and C positions. When producing a bottle body, the turntable seat 51 moves downward under the drive of the lifting frame 4, so that the die nozzle assembly 6 located on the injection molding station extends into the injection mold 2 and forms a cavity for molding a preform with the injection mold 2. After the preform is formed, the die nozzle assembly 6 fixes the preform by pressing against the bottle mouth of the preform, and then the lifting frame 4 drives the turntable seat 51 to move upward; then the second servo motor 53 drives the turntable 52 to rotate 90 degrees to the heating station (when heating is required), and then rotates 90 degrees to the blow molding station, and the turntable seat 51 moves downward under the drive of the lifting frame 4, so that the die nozzle assembly 6 located on the blow molding station moves the preform into the blow molding mold 3 to blow the preform, and after the blow molding is completed, the lifting frame 4 drives the turntable seat 51 to move upward; then the second servo motor 53 drives the turntable 52 to rotate 90 degrees, and moves the blow-molded bottle body to the pickup station, waiting for the robot to pick it up; then the injection molding, heating (can be omitted when heating is not required), blow molding, and pickup steps are repeated in sequence.

[0043] The lower end of the linkage rod 511 is fixed to the turntable seat 51 by threaded connection, and the upper end thereof is slidably engaged with the upper end plate 41. When the lifting frame 4 is at the highest position, the upper end plate 41 engages the linkage rod 511, and the upper surface of the upper end plate 41 is flush with the upper end of the linkage rod 511; when the lifting frame 4 is at the lowest position, the upper end of the linkage rod 111 protrudes above the upper end plate 41, and at this time, the distance between the upper end plate 41 and the turntable seat 51 is the smallest.

[0044] During the bottle production process, the lifting frame 4 first moves downward by a distance D1, and the turntable assembly 5 also moves downward by a distance D1, so that the core rod 63 installed on the lower end surface of the turntable assembly 5 puts the bottle blank into the blow mold 2; then the lifting frame 4 further descends to drive the air nozzle head 411 to move downward by a distance D2 (at this time, the height position of the turntable assembly 5 remains unchanged), so that the air nozzle head 411 presses against and seals the top opening of the core rod 63, and then the compressed gas is input into the bottle blank to complete the blowing process; then the lifting frame 4 moves upward by a distance D2, so that the air nozzle head 411 no longer seals the top opening of the core rod 63; then the lifting frame 4 continues to move upward by a distance D1, and under the action of the linkage rod 511, it drives the turntable assembly 5 to move upward by a distance D1, and takes the formed bottle body out of the blow mold 2.

[0045] The lifting frame 4 and the turntable assembly 5 in the present invention, under the action of the linkage rod 511, only require one set of power mechanism (i.e., a power mechanism composed of a first servo motor 12, a reducer 13 and a screw rod 14) to drive the lifting frame to lift and lower the entire process of blowing the bottle blank into a bottle body. Compared with the blow molding machine in the CN204431711 U patent, one set of power mechanism is omitted, thereby reducing the equipment cost.

[0046] Furthermore, the quick-release locking member 54 includes two fixed blocks 541 respectively located at one end and the other end of the die nozzle assembly 6, and connecting bolts 542 are provided at both ends of the fixed block 541. A slider 543 for movably engaging the die nozzle assembly 6 is slidably provided in the middle of the fixed block 541, and connecting through holes 5431 for accommodating the connecting bolts 542 are provided at both ends of the slider 543; the connecting bolt 542 passes through the connecting through hole 5431 and is fixed to the fixed block 541; a spring 544 for driving the slider 543 to engage the die nozzle assembly 6 is accommodated in the connecting through hole 5431, and the spring 544 is sleeved with the connecting bolt 542; one end of the spring 544 presses against the connecting bolt 542, and the other end presses against the slider 543; the fixed block 541 is fixedly connected to the turntable 52, and is slidably connected to the die nozzle assembly 6.

[0047] Furthermore, the die nozzle assembly 6 includes a separate connecting plate 61, on which a mouth mold 62 is provided for adapting to the injection mold 2 to thermoform the plastic into a preform and fixedly conveying the preform to the blow mold 3 under the action of the turntable 52, and a core rod 63 is provided on the mouth mold 62 for extending out of the inner space of the preform; both ends of the separate connecting plate 61 are provided with a card slot 611 corresponding to the slider 543, and the slider 543 is movably connected in the card slot 611;

[0048] An inclined hole 5432 is provided on the slider 543, and a core-changing cylinder 513 is provided on the turntable seat 51. An inclined pin 5131 is provided on the output shaft of the core-changing cylinder 513 for movably inserting into the inclined hole 5432 and driving the slider 543 away from the die nozzle assembly 6 so that the die nozzle assembly 6 is switched from a locked state to an unlocked state. The inclined pin 5131 passes through the turntable seat 51 and the turntable 52 in sequence.

[0049] like Figure 6-14 As shown, there are two fixing blocks 541, which are used to fix the two ends of the separated connecting plate 61 respectively, and are fixed to the turntable 52 by bolts; the slider 543 is T-shaped, and is slidably engaged with the fixing block 541 under the cooperation of the connecting bolt 542 and the spring 544; the slider 543 normally engages the separated connecting plate 61 without being subjected to external force. When the die nozzle assembly 6 needs to be replaced, the slider 543 is pulled away from the die nozzle assembly 6 by hand, and then the die nozzle assembly 6 is pulled out to complete the work of removing the die nozzle assembly 6. Slide the die nozzle assembly 6 of another specification between the two fixing blocks 541, and then loosen the slider 543, so that the slider 543 is inserted into the card slot 611 to complete the work of installing the die nozzle assembly 6. The die nozzle assembly 6 can be replaced by simply pushing and pulling the slider 543, which is convenient and fast.

[0050] The separate connecting plate 61 is composed of two half-side plates connected by bolts. Two or more mouth molds 62 are fixedly installed in the length direction through the buckling structure of the two half-side plates. The mouth mold 62 is inserted into the bottle mouth of the preform to fix the preform in an interference fit. The bottom of the mouth mold 62 is threadedly connected to the core rod 63. The bottom of the core rod 63 is provided with an air guide hole 631. The air guide hole 631 is used to transport compressed gas into the interior of the preform and then inflate the preform in the cavity of the blow mold 3. The two half-side plates are connected by bolts to form the separate connecting plate 61, so that the mouth mold 62 can be replaced separately when it is worn, avoiding the scrapping of the entire die nozzle assembly 6.

[0051] The core-changing cylinder 513 is fixedly mounted on the turntable seat 51 by bolts, and its output shaft is installed with an oblique pin 5131 by welding or other existing methods. With the cooperation of the controller and the solenoid valve, the core-changing cylinder 513 moves downward, so that the oblique pin 5131 is inserted into the oblique hole 5432 and pushes the slider 543 away from the slot 611, so that the die nozzle assembly 6 is switched from the locked state to the unlocked state. This design further speeds up the speed of replacing the die nozzle assembly 6, and is safer and more convenient than manually pulling out the slider 543.

[0052] Furthermore, a nozzle head 411 for inputting compressed air into the core rod 63 is disposed on the lower end surface of the upper end plate 41 , and the nozzle head 411 is movably pressed against and seals the top opening of the core rod 63 .

[0053] like Figure 1-6 As shown, the nozzle head 411 is installed on the lower end surface of the upper end plate 41 through a threaded structure, and corresponds to the blow molding station of the turntable seat 51. There are two nozzle heads 411, corresponding to the number of core rods 63 in each die nozzle assembly 6. During blow molding, the lower end of the nozzle head 411 passes through the turntable seat 51 and the turntable 52 to block the top opening (air inlet) of the core rod 63; when the turntable 52 drives the core rod 63 to rotate, the lower end of the nozzle head 411 is at least located above the turntable 52 to prevent the turntable 52 from being unable to rotate.

[0054] Furthermore, a stretching cylinder 41212 is provided on the upper end plate 41, and a stretching rod 412121 which can be movably extended into the interior of the bottle blank to stretch it is provided on the movable end of the stretching cylinder 41212; the fixed end of the stretching cylinder 41212 is fixedly connected to the upper end plate 41; the stretching rod 412121 penetrates the upper end plate 41, the nozzle head 411, the turntable seat 51, the turntable 52 and the core rod 63 from top to bottom in sequence, and then is inserted into the interior of the bottle blank to stretch the bottle blank.

[0055] like Figure 1-6As shown, for a bottle with a thick wall, in order to obtain a more uniform wall thickness and strength in the longitudinal direction of the bottle, the preform needs to be stretched before inflation. The stretching steps are: the stretching cylinder 412 extends downward, so that the stretching rod 4121 passes through the upper end plate 41, the nozzle head 411, the turntable seat 51, the turntable 52 and the core rod 63 from top to bottom in sequence, and then is inserted into the preform to stretch the preform; after the stretching is completed, the nozzle head 411 inputs compressed gas, which enters the preform through the core rod 63 to inflate.

[0056] like Figure 1-6 As shown, the upper end surface of the turntable seat 51 is threadedly connected with at least two limit columns 512, preferably four; when the lifting frame 4 continues to move downward a distance D2, the upper end plate 41 presses against the limit columns 512 to prevent the distance between the upper end plate 41 and the turntable seat 51 from being further compressed, thereby preventing the nozzle head 411 from pressing against the core rod 63 with a large pressure, avoiding damage to the nozzle head 411 or the core rod 63.

[0057] Furthermore, it also includes a water-liquid solenoid valve (not shown in the drawings); a cooling water circuit is opened in the injection mold 2, the water inlet of the cooling water circuit is connected to the water outlet of the water-liquid solenoid valve, the water outlet of the cooling water circuit is connected to the return water port of the external water transport mechanism, and the water inlet of the water-liquid solenoid valve is connected to the water outlet of the external water transport mechanism.

[0058] Furthermore, the water liquid solenoid valve is a normally closed solenoid valve.

[0059] In the present embodiment, the water-liquid solenoid valve is a conventional diaphragm-type secondary-opening pilot solenoid valve, which is suitable for water or other gaseous liquids as working media, and can automatically control or remotely control the on-off of working medium pipelines such as air, water, and oil liquids. The water inlet of the water-liquid solenoid valve is connected to the water outlet of the external water transport machine through a conduit, and its water outlet is connected to the water inlet of the cooling water circuit through a conduit; the water outlet of the cooling water circuit is connected to the return water port of the external water transport machine through a conduit. The conventional ice water machine used in the field of external water transport machine injection molding can output cooling water of a specific temperature. The cooling water enters the cooling water circuit inside the injection mold through the water-liquid solenoid valve and the conduit, and then flows back to the inside of the external water transport machine through the conduit for cooling treatment.

[0060] The water-liquid solenoid valve is a normally closed solenoid valve. When the injection mold is not in production, the water-liquid solenoid valve is normally closed, the cooling water circuit is not flowing, and the temperature of the injection mold is close to the room temperature. It is not easy to produce water mist or water droplets, thereby preventing the mold from rusting and improving the appearance yield of the product. During the production of the injection mold (the time of the two stages of injection and pressure holding is the mold production time), the water-liquid solenoid valve is opened synchronously under the control of the PLC, and the cooling water circuit is flowing to cool the injection mold. In order to achieve rapid cooling of the injection mold, the water temperature is adjusted to 1-5℃ (the traditional cooling water temperature is around 20℃). In the same time, the mold is cooled better, thereby shortening the cooling time and increasing the output. After a cycle of production is completed, the power is immediately turned off and the water-liquid solenoid valve is turned off. The specific power-on time of the water-liquid solenoid valve and the power-on / power-off time can be set on the PLC computer on the bottle blow molding machine.

[0061] In this embodiment, a water-liquid solenoid valve is connected to the cooling water path of the injection mold 2, so that the water-liquid solenoid valve is in a normally closed state during the non-injection and pressure-holding stages. Water does not flow inside the cooling water path, and the temperature of the injection mold is close to the room temperature, so it is not easy to generate water mist or water droplets, thereby preventing the mold from rusting and improving the appearance yield of the product.

[0062] Furthermore, in order to reduce the waste of plastic and the scrap rate, and also to reduce the maintenance cost of the mold, the injection mold 2 adopts a hot runner mold.

[0063] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A bottle blow molding machine, characterized in that: The invention comprises a frame, a mounting plate is arranged on the frame, an injection mold for forming a bottle blank and a blow mold for inflating the bottle blank into a bottle body are arranged on the mounting plate, a lifting frame sliding in a vertical direction is slidably arranged on the mounting plate, a turntable assembly is slidably engaged with the middle part of the lifting frame, and at least three groups of die nozzle assemblies for adapting to the injection mold to thermoform the plastic into a bottle blank and conveying the bottle blank to the blow mold are arranged on the turntable assembly; a first servo motor and a reducer are arranged in the frame, the output shaft of the first servo motor is fixedly connected to the input end of the reducer, a screw rod for driving the lifting frame to slide up and down is arranged at the output end of the reducer, and the screw rod is threadedly connected to the lower end of the lifting frame; the lower end of the lifting frame is located below the mounting plate, and the upper end thereof is located above the mounting plate.

2. The bottle blow molding machine according to claim 1, characterized in that: The lifting frame includes an upper end plate located above the mounting plate, a lower end plate located below the mounting plate, and four guide columns slidably connected to the mounting plate; the guide columns penetrate the mounting plate, and their upper ends are fixedly connected to the upper end plate, and their lower ends are fixedly connected to the lower end plate; the turntable assembly is slidably sleeved with the guide columns, and is located between the mounting plate and the upper end plate.

3. The bottle blow molding machine according to claim 2, characterized in that: The turntable assembly includes a turntable seat, a turntable is rotatably arranged on the lower end surface of the turntable seat, a second servo motor for driving the turntable to rotate is arranged on the upper end surface of the turntable seat, and quick-release locking parts for locking the die nozzle assembly on the turntable are arranged in an evenly spaced circular array on the lower end surface of the turntable, and the quick-release locking parts are slidably engaged with the die nozzle assembly; the output shaft of the second servo motor passes through the turntable seat and is fixedly connected with the turntable; four linkage rods are arranged on the upper end surface of the turntable seat for driving the turntable seat to move up and down with the lifting frame, and one end of the linkage rod away from the turntable seat is slidably engaged with the upper end plate; a number of limit columns are arranged on the turntable seat for preventing the turntable seat from abutting against the upper end plate.

4. The bottle blow molding machine according to claim 3, characterized in that: The quick-release locking part includes two fixed blocks respectively located at one end and the other end of the die nozzle assembly, connecting bolts are arranged at both ends of the fixed blocks, a slider for movably engaging the die nozzle assembly is slidably arranged in the middle of the fixed block, connecting through holes for receiving the connecting bolts are opened at both ends of the slider; the connecting bolts are fixed on the fixed block after passing through the connecting through holes; a spring for driving the slider to engage the die nozzle assembly is received in the connecting through holes, and the spring is sleeved with the connecting bolt; one end of the spring presses against the connecting bolt, and the other end presses against the slider; the fixed block is fixedly connected to the turntable and is slidably connected to the die nozzle assembly.

5. The bottle blow molding machine according to claim 4, characterized in that: The die nozzle assembly includes a separate connecting plate, on which a mouth mold is provided for adapting to the injection mold to thermoform the plastic into a preform and fixedly conveying the preform to the blow mold under the action of a turntable, and a core rod is provided on the mouth mold for extending out of the inner space of the preform; both ends of the separate connecting plate are provided with a slot corresponding to the slider, and the slider is movably connected in the slot; An inclined hole is provided on the slider, a core-changing cylinder is provided on the turntable seat, and an inclined pin is provided on the output shaft of the core-changing cylinder for movably inserting into the inclined hole and driving the slider away from the die nozzle assembly so that the die nozzle assembly is switched from a locked state to an unlocked state. The inclined pin passes through the turntable seat and the turntable in sequence.

6. The bottle blow molding machine according to claim 5, characterized in that: The lower end surface of the upper end plate is provided with an air nozzle head for inputting compressed air into the core rod, and the air nozzle head is movably pressed against and sealed against the top opening of the core rod.

7. The bottle blow molding machine according to claim 6, characterized in that: A stretching cylinder is arranged on the upper end plate, and a stretching rod which is movable and extends into the bottle blank to stretch it is arranged on the movable end of the stretching cylinder; the fixed end of the stretching cylinder is fixedly connected to the upper end plate; the stretching rod penetrates the upper end plate, the nozzle head, the turntable seat, the turntable and the core rod from top to bottom in sequence, and then is inserted into the bottle blank to stretch the bottle blank.

8. The bottle blow molding machine according to claim 1, characterized in that: It also includes a water-liquid solenoid valve; a cooling water circuit is opened in the injection mold, the water inlet of the cooling water circuit is connected to the water outlet of the water-liquid solenoid valve, the water outlet of the cooling water circuit is connected to the return water port of the external water transport mechanism, and the water inlet of the water-liquid solenoid valve is connected to the water outlet of the external water transport mechanism.

9. The bottle blow molding machine according to claim 8, characterized in that: The water solenoid valve is a normally closed solenoid valve.

10. The bottle blow molding machine according to claim 8, characterized in that: The injection mold is a hot runner type mold.

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