An injection blow molding machine with the ability of rapid cooling and forming

Abstract

The present invention relates to the technical field of plastic processing, and particularly to a injection blow molding machine with the ability of rapid cooling and forming, including a chassis, an auxiliary injection and blowing assembly, a first blow molding die, a second blow molding die, etc.; the auxiliary injection and blowing assembly is installed on the chassis; a preform is made through the auxiliary injection and blowing assembly; the first blow molding die is slidably connected to the chassis; a plurality of first mold cavities are arranged in each first blow molding die; the second blow molding die is slidably connected to the chassis; a plurality of second mold cavities are arranged in each second blow molding die; two driving members are fixedly connected to the chassis; the telescopic ends of each driving member are respectively fixedly connected to the first blow molding die and the second blow molding die. In the present invention, low-temperature gas is directly blown onto the surface of the formed plastic bottle, so as to directly take away the heat on the surface of the plastic bottle, reduce the distance and time of heat transfer, thereby improving the cooling speed of the formed plastic bottle, and achieving the effect of rapidly cooling and reducing the temperature of the plastic bottle.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic processing, and particularly to a injection-blow molding machine with the ability of rapid cooling and forming. Background Art

[0002] In the injection-blow molding process, first, an injection tube is inserted into an injection mold, and a material in a plasticized state is injected to form a preform with a preliminary shape on the injection tube. Then, the injection tube together with the newly formed preform is transferred to a blow mold. At this stage, compressed gas is injected into the preform through the injection tube, causing the preform to expand outward and closely adhere to the inner wall of the blow mold, thereby completing the final forming of the plastic bottle. However, the just-formed plastic bottle has a high temperature. The traditional cooling method relies on setting cooling channels in the mold to reduce the mold temperature, and then indirectly cools the plastic bottle by the mold. This method increases the heat transfer path, resulting in a slow cooling rate and a long required cooling time. For some plastic bottles with strict requirements on dimensional stability and surface quality, this cooling method cannot meet the need for rapid cooling, thus affecting the production quality and efficiency of the product. Summary of the Invention

[0003] In order to overcome the disadvantages that in the cooling stage after the plastic bottle is formed by the existing injection-blow molding machine, due to relying on the indirect cooling method of the mold, the cooling efficiency is low and the time is long, and it cannot meet the rapid cooling requirements of products with strict requirements on dimensional stability and surface quality, thus affecting the production quality and efficiency, the present invention provides an injection-blow molding machine with the ability of rapid cooling and forming.

[0004] Technical solution: An injection-blow molding machine with the ability of rapid cooling and molding, comprising a chassis and an auxiliary injection-blowing assembly; the auxiliary injection-blowing assembly is installed on the chassis; preforms are made through the auxiliary injection-blowing assembly; it further comprises a first blow molding die, a second blow molding die, a bottom plate, a top plate, a driving member and a blanking assembly; the first blow molding die is slidably connected to the chassis; a plurality of first cavities are arranged in each first blow molding die; the second blow molding die is slidably connected to the chassis; a plurality of second cavities are arranged in each second blow molding die; two driving members are fixedly connected to the chassis; the telescopic ends of each driving member are respectively fixedly connected to the first blow molding die and the second blow molding die; the blanking assembly is installed on the chassis; the bottom plate is connected to the blanking assembly, and the bottom plate is driven to move up and down and left and right through the blanking assembly; a plurality of bottom die cores are arranged on the bottom plate, and each bottom die core and the adjacent first cavity and second cavity jointly form a blow molding cavity for a plastic bottle; a plurality of air collecting holes are formed in the bottom plate; a first communication cavity is formed in the bottom plate, and the first communication cavity is communicated with all the air collecting holes; an air vent is formed in the lower part of the first communication cavity; the top plate is fixedly connected to the chassis; the top plate is in sliding contact with the upper surfaces of the first blow molding die and the second blow molding die respectively; a plurality of through holes are formed in the top plate; a third communication cavity is formed in the top plate, the third communication cavity is communicated with an external gas storage device through an air pipe; a plurality of exhaust holes are formed in the bottom of the third communication cavity.

[0005] In addition, particularly preferably, the auxiliary injection-blowing assembly comprises a lifting platform, a rotating plate, a fixing plate, an injection-blowing pipe and an injection unit; the lifting platform is arranged on the chassis; an electric push rod is installed on the chassis; the lifting platform is driven to lift through the electric push rod; the rotating plate is rotatably connected to the lifting platform; a motor is arranged on the lifting platform, and the rotating plate is driven to rotate through the motor; four fixing plates arranged in a ring are fixedly connected to the rotating plate; a plurality of injection-blowing pipes are fixedly connected to each fixing plate; an air transmission channel is arranged in each injection-blowing pipe, and the injection-blowing pipe is communicated with an external air pumping device; the injection unit is installed on the chassis; the injection unit is composed of an electric push rod, two injection dies and an injection pipe; the closing and opening of the two injection dies are controlled through the electric push rod; an inner cavity facilitating the entry of the injection-blowing pipe is formed in the injection die, the injection pipe is used for conveying molten plastic, and the molten plastic is injected between the injection die and the injection-blowing pipe through the injection pipe, so as to form a preform on the injection-blowing pipe.

[0006] In addition, particularly preferably, a plurality of grooves are arranged on the first blow molding die; a plurality of protruding parts are arranged on the second blow molding die, and the protruding parts are slidably connected with the grooves.

[0007] In addition, particularly preferably, the blanking assembly comprises a first slide rail, a first electric slider, a second slide rail and a second electric slider; the first slide rail is fixedly connected to the chassis; the first electric slider is slidably connected to the first slide rail; the second slide rail is fixedly connected to the first electric slider; the second electric slider is slidably connected to the second slide rail; the second electric slider is fixedly connected to the bottom of the bottom plate.

[0008] In addition, it is particularly preferred that a gas storage tank is further included; a gas storage tank for recovering gas to reduce energy loss is fixedly connected to the chassis; the air vent of the gas storage tank and the first communication cavity is connected through a hose; the gas storage tank is connected to an external gas storage device.

[0009] In addition, it is particularly preferred that a sliding rod and a first elastic member are further included; a second communication cavity for facilitating the adsorption of plastic bottles by the bottom plate is provided inside the bottom plate, and the second communication cavity is connected to an external air extraction device; a sealing cavity is provided inside each bottom die core; a sliding rod is slidably connected inside each sealing cavity; a first elastic member is fixedly connected between each sliding rod and the second communication cavity.

[0010] In addition, it is particularly preferred that a clamping ring portion is provided on the lower side of each sliding rod, and the clamping ring portion is located at the connection of the sealing cavity and the second communication cavity; the diameter of the clamping ring portion is set to be greater than the maximum diameter of the sealing cavity.

[0011] In addition, it is particularly preferred that a top block and a second elastic member are further included; a cavity is provided inside each sliding rod; a top block is slidably connected inside each cavity; the top block penetrates through the top surface of the sliding rod and the upper surface of the bottom die core; the top block is slidably connected to the bottom die core; the upper end surface of the top block and the surface of the bottom die core fit perfectly to form a complete bottom die surface; a second elastic member is fixedly connected between the upper top surface of each cavity and the top block.

[0012] In addition, it is particularly preferred that a lower pressing plate and a sliding plate are further included; a plurality of lower pressing plates are fixedly connected to the rotating plate; an inclined portion is provided on each lower pressing plate; a sliding plate for improving the sealing performance in the blow molding cavity is connected to the top plate through a spring; two symmetrically arranged extrusion blocks are provided on the sliding plate; the lowest point of the lower pressing plate is set to be lower than the lowest point of the injection pipe; initially, the sliding plate covers the through hole of the top plate.

[0013] In addition, it is particularly preferred that an air inlet pipe and an annular pipe are further included; a ring groove is provided on the outside of each bottom die core; an air inlet pipe is fixedly connected to the bottom plate; a plurality of annular pipes for preventing water droplets from condensing on the surface of the plastic bottle are communicated with the air inlet pipe; each annular pipe is located in the adjacent ring groove; the air inlet pipe and the gas storage tank are connected through a hose; a plurality of blow holes arranged in a ring shape are provided on the annular pipe.

[0014] Beneficial effects: Compared with the method of cooling plastic bottles through a mold, by directly blowing low-temperature gas onto the surface of the formed plastic bottle, the heat on the surface of the plastic bottle can be directly taken away, reducing the distance and time of heat transfer, thereby increasing the cooling speed of the formed plastic bottle and achieving the effect of quickly cooling and lowering the temperature of the plastic bottle.

[0015] By controlling the bottom die core on the bottom plate to support and move the plastic bottle, the operations of using an external suction cup for moving, aligning, and sucking the plastic bottle are eliminated, thereby improving the production efficiency of the plastic bottle.

[0016] An external gas storage device is used to deliver low-temperature air flow into the third communication cavity, so that the air flow continuously blows downward until it blows out from the bottoms of the first blow molding die and the second blow molding die, thereby blocking the water vapor in the external air from entering the interior through the bottoms of the first blow molding die and the second blow molding die and causing condensation, thus avoiding the condensed water droplets from affecting the forming quality of the surface of the plastic bottle.

[0017] The plastic bottle is pushed upward by the top block, so that the plastic bottle is separated from the bottom die core. Thus, while the plastic bottle is taken by the external unloading unit, the plastic bottle can be easily unloaded by pushing upward with the top block, improving the blanking efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of an injection-blowing machine with fast cooling and forming ability according to the present invention;

[0019] Figure 2 is a top view of the structure between the chassis and the lifting platform according to the present invention;

[0020] Figure 3 is a combined sectional view of the chassis and the lifting platform according to the present invention;

[0021] Figure 4 is a three-dimensional structural schematic diagram of the fixing plate, the injection pipe, and the preform combination according to the present invention;

[0022] Figure 5 is a three-dimensional structural schematic diagram of the combination of the first blow molding die, the second blow molding die, and the top plate according to the present invention, wherein the top plate is in a sectional view;

[0023] Figure 6 is an open state diagram of the first blow molding die and the second blow molding die according to the present invention;

[0024] Figure 7 is a three-dimensional structural schematic diagram of the combination of the rotating plate, the lower pressing plate, and the sliding plate according to the present invention;

[0025] Figure 8 is a three-dimensional structural schematic diagram of the combination of the top plate, the lower pressing plate, and the sliding plate according to the present invention;

[0026] Figure 9 is a three-dimensional structural schematic diagram of the combination of the bottom plate, the air inlet pipe, and the annular pipe according to the present invention, wherein the bottom plate is in a sectional view;

[0027] Figure 10 is a combined sectional view of the bottom plate and the sliding rod according to the present invention;

[0028] Figure 11 Partial cross-sectional view of the bottom plate of the present invention.

[0029] In the figure: 1 - chassis, 2 - lifting platform, 3 - rotating plate, 4 - fixing plate, 5 - injection tube, 6 - preform, 7 - injection unit, 8 - first blow molding die, 8001 - first cavity, 8002 - groove, 9 - second blow molding die, 9001 - second cavity, 9002 - protrusion, 10 - bottom plate, 1001 - bottom die core, 1002 - air collecting hole, 1003 - first communication cavity, 1004 - second communication cavity, 1005 - sealing cavity, 1006 - annular groove, 11 - top plate, 1101 - through hole, 1102 - third communication cavity, 1103 - exhaust hole, 201 - driving member, 202 - first slide rail, 203 - first electric slider, 204 - second slide rail, 205 - second electric slider, 206 - air storage tank, 207 - sliding rod, 20701 - clamping ring portion, 20702 - cavity, 208 - first elastic member, 209 - top block, 210 - second elastic member, 211 - lower pressing plate, 21101 - inclined portion, 212 - sliding plate, 21201 - extrusion block, 301 - intake pipe, 302 - annular pipe. Detailed implementation mode

[0030] To make the purpose, technical solution and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with the specific implementation mode and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary and not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessarily confusing the concept of the present invention.

[0031] Embodiment 1

[0032] An injection-blow molding machine with the ability of rapid cooling and molding, as Figures 1 - 11 shown, includes a chassis 1 and an auxiliary injection and blowing assembly; the auxiliary injection and blowing assembly is installed on the chassis 1; the preform 6 is made through the auxiliary injection and blowing assembly;

[0033] It further includes a first blow molding die 8, a second blow molding die 9, a bottom plate 10, a top plate 11, a driving member 201 and a blanking assembly; the first blow molding die 8 is slidably connected to the front side of the chassis 1; four first mold cavities 8001 are provided in each first blow molding die 8; the second blow molding die 9 is slidably connected to the front side of the chassis 1; four second mold cavities 9001 are provided in each second blow molding die 9; two driving members 201 that are symmetrically arranged front and back are fixedly connected to the front side of the chassis 1, and the driving member 201 is an electric push rod; the telescopic ends of each driving member 201 are fixedly connected to the first blow molding die 8 and the second blow molding die 9 respectively; a blanking assembly is installed on the chassis 1; the blanking assembly is connected to the bottom plate 10, and the bottom plate 10 is driven by the blanking assembly to move up and down and left and right; four bottom die cores 1001 are provided on the bottom plate 10, and each bottom die core 1001 and the adjacent first mold cavity 8001 and second mold cavity 9001 together form a blow molding cavity for a plastic bottle; three air collecting holes 1002 are opened on the bottom plate 10; a first communication cavity 1003 is opened in the bottom plate 10, and the first communication cavity 1003 is communicated with all the air collecting holes 1002; an air vent is opened at the lower part of the first communication cavity 1003; the top plate 11 is fixedly connected to the chassis 1; the top plate 11 is in sliding contact with the upper surfaces of the first blow molding die 8 and the second blow molding die 9 respectively; four through holes 1101 are opened on the top plate 11; a third communication cavity 1102 is opened in the top plate 11, and the third communication cavity 1102 is communicated with an external air storage device through an air pipe; three exhaust holes 1103 are opened at the bottom of the third communication cavity 1102.

[0034] The auxiliary blowing and injecting assembly includes a lifting platform 2, a rotating plate 3, a fixing plate 4, a blowing and injecting pipe 5 and an injection unit 7; the lifting platform 2 is provided on the chassis 1; an electric push rod is installed on the chassis 1; the lifting platform 2 is driven by the electric push rod to move up and down; the rotating plate 3 is rotatably connected to the lifting platform 2; a motor is provided on the lifting platform 2, and the rotating plate 3 is driven by the motor to rotate; four fixing plates 4 arranged in a ring are fixedly connected to the rotating plate 3; four blowing and injecting pipes 5 are fixedly connected to each fixing plate 4; an air conveying channel is provided in each blowing and injecting pipe 5, and the blowing and injecting pipe 5 is communicated with an external air pumping device; the injection unit 7 is installed on the rear side of the chassis 1; the injection unit 7 is composed of an electric push rod, two injection molds and an injection pipe; the closing and opening of the two injection molds are controlled by the electric push rod; an inner cavity for facilitating the entry of the blowing and injecting pipe 5 is opened on the injection mold, and the injection pipe is used for conveying molten plastic, and the molten plastic is injected between the injection mold and the blowing and injecting pipe 5 through the injection pipe, so as to form a preform 6 on the blowing and injecting pipe 5.

[0035] Two symmetrically arranged grooves 8002 are provided on the first blow molding die 8; two symmetrically arranged protrusions 9002 are provided on the second blow molding die 9, and the protrusion 9002 is slidably connected to the groove 8002.

[0036] The blanking component includes a first slide rail 202, a first electric slider 203, a second slide rail 204 and a second electric slider 205; the first slide rail 202 is fixedly connected to the front side of the chassis 1; the first electric slider 203 is slidably connected to the first slide rail 202; the second slide rail 204 is fixedly connected to the first electric slider 203; the second electric slider 205 is slidably connected to the second slide rail 204; the second electric slider 205 is fixedly connected to the bottom of the bottom plate 10.

[0037] It further includes an air storage tank 206; the air storage tank 206 is fixedly connected to the chassis 1; the air vent of the air storage tank 206 is connected to the first communication cavity 1003 through a hose; the air storage tank 206 is connected to an external air storage device.

[0038] It further includes a sliding rod 207 and a first elastic member 208; a second communication cavity 1004 is formed inside the bottom plate 10, and the second communication cavity 1004 is connected to an external air extraction device; a sealing cavity 1005 is formed inside each bottom die core 1001; a sliding rod 207 is slidably connected inside each sealing cavity 1005; a first elastic member 208, which is a spring, is fixedly connected between each sliding rod 207 and the second communication cavity 1004.

[0039] Furthermore, to ensure that the sliding rod 207 does not protrude from the surface of the bottom die core 1001 under normal conditions, a clamping ring portion 20701 is provided on the lower side of each sliding rod 207, and the clamping ring portion 20701 is located at the connection between the sealing cavity 1005 and the second communication cavity 1004; the diameter of the clamping ring portion 20701 is set to be greater than the maximum diameter of the sealing cavity 1005.

[0040] It further includes a top block 209 and a second elastic member 210; a cavity 20702 is provided inside each sliding rod 207; a top block 209 is slidably connected inside each cavity 20702; the top block 209 penetrates through the top surface of the sliding rod 207 and the top surface of the bottom die core 1001; the top block 209 is slidably connected to the bottom die core 1001; the upper end surface of the top block 209 perfectly fits with the surface of the bottom die core 1001 to form a complete bottom die surface; a second elastic member 210, which is a spring, is fixedly connected between the upper top surface of each top block 209 and the cavity 20702.

[0041] It further includes a lower pressing plate 211 and a sliding plate 212; four lower pressing plates 211 arranged in a ring are fixedly connected to the rotating plate 3; an inclined portion 21101 is provided on each lower pressing plate 211; the sliding plate 212 is connected to the top plate 11 through a spring; two symmetrically arranged extrusion blocks 21201 are provided on the sliding plate 212; the lowest point of the lower pressing plate 211 is set to be lower than the lowest point of the injection tube 5; initially, the sliding plate 212 covers the through hole 1101 of the top plate 11.

[0042] The following is a detailed description of the processing process for plastic bottles:

[0043] First, control the lifting platform 2 to move downward through the electric push rod, so that the lifting platform 2, the rotating plate 3, the fixed plate 4 and their connecting parts move downward, so that the blowing tube 5 on the rear fixed plate 4 is inserted into the injection unit 7. Then, injection molding is carried out through the injection unit 7 to form a preform 6 on the blowing tube 5. At this time, the preform 6 is in a plastic state. Then, control the lifting platform 2 to move upward, so that the blowing tube 5 and the preform 6 move upward together and separate from the injection unit 7. Then, with the top-down view as the reference, control the motor on the rotating plate 3 to rotate, so that the rotating plate 3 rotates clockwise by 180 degrees, so that the preform 6 on the rear blowing tube 5 faces the front side. Subsequently, control the lifting platform 2 to move downward, so as to synchronously drive the lower pressing plate 211, the blowing tube 5 and the preform 6 to move downward. Since the lowest point of the lower pressing plate 211 is set lower than the lowest point of the blowing tube 5, the inclined part 21101 of the lower pressing plate 211 first contacts the extrusion block 21201 of the sliding plate 212. By pressing the extrusion block 21201 downward through the inclined part 21101, the extrusion block 21201 receives a forward thrust, so that the sliding plate 212 moves forward. The spring between the sliding plate 212 and the top plate 11 is compressed, and the through hole 1101 is opened. Subsequently, control the lifting platform 2 to continue to move downward, so that the blowing tube 5 and the preform 6 first pass through the corresponding through hole 1101 on the top plate 11, and then are inserted between the first blow molding die 8 and the second blow molding die 9. Then, control the two driving parts 201 to drive the adjacent first blow molding die 8 and the second blow molding die 9 to move towards each other, so that the first blow molding die 8 and the second blow molding die 9 are mutually attached. Moreover, the first blow molding die 8 and the second blow molding die 9 are respectively closely attached to the bottom plate 10 and the top plate 11. In this way, the air collecting hole 1002 and the exhaust hole 1103 are covered by the first blow molding die 8 and the second blow molding die 9, and a sealed blow molding cavity is formed between the first mold cavity 8001, the second mold cavity 9001 and the bottom mold core 1001. And the preform 6 is located in the corresponding blow molding cavity. Then, control the external air pumping device to pump air into the air conveying channel in the blowing tube 5, so that the air flow blows into the preform 6, so that the preform 6 is inflated until the outer wall of the preform 6 fits the blow molding cavity. At the same time, the blowing tube 5 is separated from the preform 6, so as to complete the molding of the plastic bottle. Then, control the lifting platform 2 to move upward, so that the lower pressing plate 211 and the blowing tube 5 move upward until the blowing tube 5 exits from the through hole 1101. The formed plastic bottle remains in the blow molding cavity. At this time, the inclined part 21101 of the lower pressing plate 211 is separated from the extrusion block 21201 of the sliding plate 212. The sliding plate 212 loses the extrusion of the lower pressing plate 211. Thus, under the action of the spring between the sliding plate 212 and the top plate 11, the sliding plate 212 moves backward and resets, so as to cover the through hole 1101 and cut off the connection between the through hole 1101 and the outside air. Subsequently, it is necessary to cool down the formed plastic bottle. The conventional cooling method for plastic bottles is usually to cool the plastic bottles through the mold, that is, it is necessary to first cool the mold itself with cold water, and then indirectly cool the plastic through the contact between the mold and the plastic bottle.This increases the distance and time of heat transfer, so the cooling rate is slow. Therefore, the two driving members 201 are controlled to drive the adjacent first blow molding die 8 and the second blow molding die 9 to move away from each other. When a gap is generated between the first blow molding die 8 and the second blow molding die 9, the movement can be stopped. In this way, both the first blow molding die 8 and the second blow molding die 9 are separated from the formed plastic bottle, and there is a gap between them and the formed plastic bottle. Moreover, by the protruding portion 9002 being stuck in the adjacent groove 8002, the first blow molding die 8 and the second blow molding die 9 are still in a sealed state. At this time, the air collecting hole 1002 and the exhaust hole 1103 are both communicated with the blow molding cavity. Subsequently, a low-temperature air flow is conveyed into the third communication cavity 1102 through an external air storage device. Thus, the air flow blows downward into the blow molding cavity through the exhaust hole 1103, filling the gap between the first blow molding die 8 and the second blow molding die 9 and the plastic bottle with gas. Then the gas continues to flow downward to the air collecting hole 1002, and then converges into the first communication cavity 1003, and finally is discharged from the first communication cavity 1003 into the air storage tank 206. The blown gas is recovered through the air storage tank 206, and then transmitted to the external air storage device again. The recovered gas is cooled again by the external air storage device, so as to reduce energy loss. In this way, compared with the method of cooling the plastic bottle through the mold, by directly blowing the low-temperature gas onto the surface of the formed plastic bottle, the heat on the surface of the plastic bottle is directly taken away, reducing the distance and time of heat transfer, thereby increasing the cooling speed of the formed plastic bottle, achieving the effect of quickly cooling and reducing the temperature of the plastic bottle. At the same time, the flow rate and temperature of the low-temperature air flow can be controlled, so as to meet the different cooling rate requirements of the plastic bottle and improve the production efficiency of the plastic bottle.

[0044] When the cooling and temperature reduction of the plastic bottle are completed, the conventional feeding method of the plastic bottle is to first control the mold to open, then suck the bottom of the plastic bottle through an external moving suction cup, and then move the plastic bottle to the external conveyor belt. In this way, the external moving suction cup requires time during the processes of moving, aligning, and sucking the plastic bottle, thus reducing the feeding efficiency of the plastic bottle. Therefore, when the cooling and temperature reduction of the plastic bottle are completed, the second electric slider 205 is controlled to move downward on the second slide rail 204, so that the bottom plate 10, the bottom die core 1001, and the formed plastic bottle move downward until the plastic bottle disengages from between the first blow molding die 8 and the second blow molding die 9. Then the first electric slider 203 is controlled to move leftward on the first slide rail 202, driving the plastic bottle to move leftward. In this way, the plastic bottle on the bottom plate 10 is taken away by the external unloading unit on the left side of the bottom frame 1, realizing the feeding of the plastic bottle. Compared with the conventional feeding method of the plastic bottle, by controlling the bottom die core 1001 on the bottom plate 10 to support and move the plastic bottle, the operations of using an additional external suction cup to move, align, and suck the plastic bottle are eliminated, thereby improving the production efficiency of the plastic bottle.

[0045] During the process of cooling the plastic bottle with a low-temperature air flow, the low-temperature air flow will simultaneously blow towards the inner surfaces of the first blow molding die 8 and the second blow molding die 9, so that the temperatures of the inner surfaces of the first blow molding die 8 and the second blow molding die 9 are synchronously reduced. When the bottom plate 10 drives the plastic bottle to move downward for blanking operation, the bottoms of the first blow molding die 8 and the second blow molding die 9 are in an open state. In the case of high humidity in the external environment, it is very easy to occur the condensation phenomenon, that is, the water vapor in the air easily contacts the inner surfaces of the first blow molding die 8 and the second blow molding die 9 through the bottoms of the first blow molding die 8 and the second blow molding die 9. Thus, the low temperature of the inner surfaces of the first blow molding die 8 and the second blow molding die 9 will condense the water vapor in the air, and water droplets will adhere to the inner surfaces of the first blow molding die 8 and the second blow molding die 9. In this way, when the subsequent preform 6 is blow molded, it is easy to cause defects on the surface of the plastic bottle. Therefore, the communication between the through hole 1101 and the external air is blocked by the slide plate 212, so as to prevent the water vapor in the external air from entering the interiors of the first blow molding die 8 and the second blow molding die 9 through the through hole 1101. Moreover, the protrusion 9002 is stuck in the adjacent groove 8002, so as to block the water vapor in the external air from entering between the first blow molding die 8 and the second blow molding die 9 from the left and right sides of the first blow molding die 8 and the second blow molding die 9, so that only the bottom between the first blow molding die 8 and the second blow molding die 9 is in an open state. In this state, a low-temperature air flow is conveyed into the third communication cavity 1102 by an external air storage device, and the air flow continuously blows downward until it blows out of the bottoms of the first blow molding die 8 and the second blow molding die 9, so as to block the water vapor in the external air from entering the interiors through the bottoms of the first blow molding die 8 and the second blow molding die 9 and cause the condensation phenomenon, thereby avoiding the condensed water droplets from affecting the molding quality of the surface of the plastic bottle.

[0046] During the process of feeding plastic bottles, to prevent the plastic bottles from accidentally detaching from the bottom plate 10 during movement, which may lead to feeding failure, when the bottom plate 10 moves downward, an external air extraction device is used to extract air from the second communication cavity 1004, making the air pressure in the second communication cavity 1004 lower than that in the sealing cavity 1005. Since the snap ring portion 20701 is located at the connection between the second communication cavity 1004 and the sealing cavity 1005, when there is a pressure difference between the upper and lower sides of the snap ring portion 20701, the snap ring portion 20701 slides downward under the action of the pressure difference. At the same time, the first elastic member 208 is compressed, driving the slide rod 207 and the top block 209 to move downward, so that the top block 209 retracts downward into the sealing cavity 1005 and disengages from the bottom of the plastic bottle. In this way, the second communication cavity 1004 and the sealing cavity 1005 are connected, and at the same time, the sealing cavity 1005 and the bottom of the plastic bottle are connected. As the external air extraction device continues to extract air, the second communication cavity 1004 and the sealing cavity 1005 are in a negative pressure state, and the plastic bottle is firmly adsorbed on the bottom die core 1001 through negative pressure, avoiding the situation of the plastic bottle detaching from the bottom plate 10 during movement and causing feeding failure, and improving the stability of the feeding operation. Until the plastic bottle moves to the external unloading unit, the external air extraction device is controlled to perform an inflation operation, so that the air pressure in the second communication cavity 1004 and the sealing cavity 1005 returns to the same as the external air pressure. The negative pressure adsorption effect in the second communication cavity 1004 disappears, and at the same time, the first elastic member 208 returns to its original state, causing the slide rod 207 and the top block 209 to move upward and reset to the initial position. In this way, it is convenient for the external unloading unit to remove the plastic bottle from the bottom plate 10. On this basis, during the upward movement and reset of the slide rod 207, the snap ring portion 20701 is synchronously driven to move upward until the snap ring portion 20701 is stuck at the connection between the sealing cavity 1005 and the second communication cavity 1004. Since the diameter of the snap ring portion 20701 is set to be larger than the maximum diameter of the sealing cavity 1005, the upward movement of the snap ring portion 20701 is restricted, ensuring that the slide rod 207 and the top block 209 do not protrude from the surface of the bottom die core 1001 under normal conditions and guaranteeing the forming quality of the plastic bottle.

[0047] Further, during the process of plastic product molding, there is a situation where the plastic bottle adheres firmly to the surface of the bottom die core 1001. Therefore, before the external unloading unit picks up the plastic bottle, by controlling the external air extraction device to pump air into the second communication cavity 1004, and at the same time filling the cavity 20702 with air, the air pressure in the second communication cavity 1004 and the cavity 20702 increases, so that the top block 209 moves upward, and the second elastic member 210 is compressed. In this way, the top block 209 protrudes from the upper surface of the bottom die core 1001, and the plastic bottle is pushed upward by the top block 209, so that the plastic bottle is separated from the bottom die core 1001. Thus, when the external unloading unit picks up the plastic bottle, by pushing upward with the top block 209, it is convenient for the plastic bottle to be unloaded, and the blanking efficiency is improved.

[0048] Embodiment 2

[0049] On the basis of Embodiment 1, as Figure 3 and Figure 9 shown, it further includes an air inlet pipe 301 and an annular pipe 302; a ring groove 1006 is provided on the outside of each bottom die core 1001; the air inlet pipe 301 is fixedly connected to the bottom plate 10; four annular pipes 302 are communicated with the air inlet pipe 301; each annular pipe 302 is located in the adjacent ring groove 1006; the air inlet pipe 301 is communicated with the air storage tank 206 through a hose; a number of annularly arranged air blowing holes are provided on the annular pipe 302.

[0050] Since the surface temperature of the plastic bottle is relatively low under the cooling of the low-temperature gas, when the plastic bottle is exposed to the air after cooling, water droplets will inevitably condense on the surface of the plastic bottle. Therefore, when the plastic bottle is cooled in the blow molding cavity, the low-temperature gas absorbs the temperature of the plastic bottle and the mold surface, and its temperature rises. Subsequently, the heated gas is stored in the air storage tank 206. When the plastic bottle is cooled, the bottom plate 10 drives the plastic bottle to move downward. At this time, control the air storage tank 206 to pump air flow into the air inlet pipe 301 through the hose, so that the air flow blows upward through a number of annular air blowing holes on the annular pipe 302, and the air flow continuously blows along the periphery of the plastic bottle, so as to form an annular air curtain between the surface of the plastic bottle and the external air, thereby blocking the direct contact between the water vapor in the external air and the surface of the plastic bottle, and blowing the gas with a higher temperature in the air storage tank 206 to the body of the plastic bottle, so that the surface temperature of the plastic bottle starts to rise, thereby avoiding the phenomenon of dew condensation on the surface of the plastic bottle, and thus avoiding affecting the subsequent label fitting quality.

[0051] The above are only examples of the implementation of the present invention and are not used to limit the present invention. Any equivalent replacement made within the principles of the present invention shall be included within the protection scope of the present invention. The content not elaborated in detail in the present invention belongs to the prior art well-known to those skilled in the relevant technical field.

Claims

1. An injection blow molding machine with rapid cooling and molding capability, comprising a base frame (1) and an auxiliary blow molding assembly; the auxiliary blow molding assembly is mounted on the base frame (1); a preform (6) is manufactured by the auxiliary blow molding assembly; the characteristics are: The invention also comprises a first blow mould (8), a second blow mould (9), a bottom plate (10), a top plate (11), a driving member (201) and a blanking assembly; the first blow mould (8) is slidably connected to the bottom frame (1); each first blow mould (8) is provided with a plurality of first mould cavities (8001); the second blow mould (9) is slidably connected to the bottom frame (1); each second blow mould (9) is provided with a plurality of second mould cavities (9001); two driving members (201) are fixedly connected to the bottom frame (1); the telescopic end of each driving member (201) is respectively fixedly connected to the first blow mould (8) and the second blow mould (9); a blanking assembly is installed on the bottom frame (1); the blanking assembly is connected to the bottom plate (10), and the bottom plate (10) is driven to move up and down and left and right by the blanking assembly; a plurality of bottom mould cores (1001) are provided on the bottom plate (10), and each bottom mould core (1001) is provided with a plurality of bottom mould cores (1001), and each bottom mould core (1001) is provided with a plurality of bottom mould cores (1001). The core (1001) forms a blow molding cavity of the plastic bottle together with the adjacent first mold cavity (8001) and the second mold cavity (9001); a plurality of air collecting holes (1002) are provided on the bottom plate (10); a first connecting cavity (1003) is provided in the bottom plate (10), and the first connecting cavity (1003) is connected to all the air collecting holes (1002); a vent is provided at the lower part of the first connecting cavity (1003); a top plate (11) is fixedly connected to the bottom frame (1); the top plate (11) is in sliding contact with the upper surface of the first blow molding mold (8) and the upper surface of the second blow molding mold (9) respectively; a plurality of through holes (1101) are provided on the top plate (11); a third connecting cavity (1102) is provided in the top plate (11), and the third connecting cavity (1102) is connected to an external air storage device through an air pipe; a plurality of exhaust holes (1103) are provided at the bottom of the third connecting cavity (1102); Also included is a gas storage tank (206); the base frame (1) is fixedly connected with a gas storage tank (206) for recovering gas to reduce energy loss; the gas storage tank (206) is connected to the vent of the first communication cavity (1003) via a hose; the gas storage tank (206) is connected to an external gas storage device; The invention also comprises an air intake pipe (301) and an annular pipe (302); each bottom mold core (1001) is provided with an annular groove (1006) on its outer side; the bottom plate (10) is fixedly connected with the air intake pipe (301); the air intake pipe (301) is connected with a plurality of annular pipes (302) for preventing water droplets from condensing on the surface of the plastic bottle; each annular pipe (302) is located in an adjacent annular groove (1006); the air intake pipe (301) is connected with the air storage tank (206) via a hose; and the annular pipe (302) is provided with a plurality of blowing holes arranged in an annular shape.

2. The injection blow molding machine with rapid cooling and molding capability according to claim 1, characterized in that: The auxiliary injection assembly comprises a lifting platform (2), a rotating plate (3), a fixed plate (4), an injection tube (5) and an injection unit (7); the lifting platform (2) is arranged on a base frame (1); an electric push rod is installed on the base frame (1); the lifting platform (2) is driven to lift by the electric push rod; the lifting platform (2) is rotatably connected to a rotating plate (3); a motor is arranged on the lifting platform (2), and the rotating plate (3) is driven to rotate by the motor; four fixed plates (4) arranged in an annular shape are fixedly connected to the rotating plate (3); each fixed plate (4) is fixedly connected to a plurality of A blow tube (5); each blow tube (5) is provided with an air delivery channel, and the blow tube (5) is connected to an external air pump device; an injection unit (7) is installed on the base frame (1); the injection unit (7) is composed of an electric push rod, two injection molds and an injection tube; the electric push rod is used to control the closing and opening of the two injection molds; the injection mold is provided with an inner cavity for facilitating the entry of the blow tube (5), and the injection tube is used to transport molten plastic, and the molten plastic is injected into between the injection mold and the blow tube (5) through the injection tube, thereby forming a bottle embryo (6) on the blow tube (5).

3. The injection blow molding machine with rapid cooling and molding capability according to claim 1, characterized in that: The first blow mould (8) is provided with a plurality of grooves (8002); the second blow mould (9) is provided with a plurality of protrusions (9002), and the protrusions (9002) are slidably connected to the grooves (8002).

4. The injection blow molding machine with rapid cooling and molding capability according to claim 1, characterized in that: The material unloading assembly comprises a first slide rail (202), a first electric slider (203), a second slide rail (204) and a second electric slider (205); the first slide rail (202) is fixedly connected to the base frame (1); the first electric slider (203) is slidably connected to the first slide rail (202); the second slide rail (204) is fixedly connected to the first electric slider (203); the second slide rail (204) is slidably connected to the second electric slider (205); the second electric slider (205) is fixedly connected to the bottom of the base plate (10).

5. The injection blow molding machine with rapid cooling and molding capability according to claim 1, characterized in that: The invention also comprises a sliding rod (207) and a first elastic member (208); a second connecting cavity (1004) is provided inside the bottom plate (10) to facilitate the bottom plate (10) to absorb the plastic bottle, and the second connecting cavity (1004) is connected to an external air extraction device; a sealing cavity (1005) is provided inside each bottom mold core (1001); a sliding rod (207) is slidably connected inside each sealing cavity (1005); and a first elastic member (208) is fixedly connected between each sliding rod (207) and the second connecting cavity (1004).

6. The injection blow molding machine with rapid cooling and molding capability according to claim 5, characterized in that: A snap ring portion (20701) is provided on the lower side of each sliding rod (207), and the snap ring portion (20701) is located at the connection between the sealing cavity (1005) and the second connecting cavity (1004); the diameter of the snap ring portion (20701) is set to be larger than the maximum diameter of the sealing cavity (1005).

7. The injection blow molding machine with rapid cooling and molding capability according to claim 5, characterized in that: It also includes a top block (209) and a second elastic member (210); each slide bar (207) is provided with a cavity (20702); each cavity (20702) is slidably connected to a top block (209); the top block (209) passes through the top surface of the slide bar (207), and the top block (209) passes through the upper surface of the bottom mold core (1001); the top block (209) is slidably connected to the bottom mold core (1001); the upper end surface of the top block (209) and the surface of the bottom mold core (1001) perfectly fit to form a complete bottom mold surface; and a second elastic member (210) is fixedly connected between each top block (209) and the upper top surface of the cavity (20702).

8. The injection blow molding machine with rapid cooling and molding capability according to claim 1, characterized in that: It also includes a lower pressing plate (211) and a slide plate (212); a plurality of lower pressing plates (211) are fixedly connected to the rotating plate (3); each lower pressing plate (211) is provided with an inclined portion (21101); a slide plate (212) for improving the sealing performance in the blow molding cavity is connected to the top plate (11) via a spring; two left-right symmetrical extrusion blocks (21201) are provided on the slide plate (212); the lowest point of the lower pressing plate (211) is set to be lower than the lowest point of the blow injection tube (5); and initially, the slide plate (212) covers the through hole (1101) of the top plate (11).

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