CN106915061B - Bottle preform out-of-mold picker, bottle preform out-of-mold picking device and bottle preform transferring method - Google Patents

Abstract

The out-of-mold picking device for the bottle blank comprises a connecting head, a step for contacting with the end part of the bottle mouth of the bottle blank to provide a sealing surface when the bottle blank is picked up, and an inserting pin inserted into the bottle blank when the bottle blank is picked up; one end of the insertion pin is an insertion end, and the other end of the insertion pin is a fixed end; the step is arranged at the edge of the fixed end of the inserting pin, and the connector is arranged at the fixed end of the inserting pin; the inserting end of the inserting pin is provided with a plurality of airflow holes which penetrate through the inserting end and the fixed end of the inserting pin. The device for picking up the bottle blank outside the mold comprises a core blowing plate and the device for picking up the bottle blank outside the mold. The out-of-mold pick-up device for the bottle preforms may also include a blow core. The bottle blank transfer method is based on the bottle blank out-of-mold picker and the bottle blank out-of-mold picking device. The invention has the advantages of wide application range, simple structure, stable and reliable blank suction, high blank taking efficiency and the like. The invention belongs to the field of auxiliary equipment for bottle blank injection molding, and particularly relates to an external mold picker for a bottle blank and an external mold picking device for the bottle blank with the external mold picker.

Description

Bottle preform out-of-mold picker, bottle preform out-of-mold picking device and bottle preform transferring method

Technical Field

The invention belongs to auxiliary equipment for bottle blank injection molding, and particularly relates to an external mold picker for a bottle blank, an external mold picking device for the bottle blank provided with the external mold picker, and a method for transferring the bottle blank by using the external mold picker.

Background

In the injection-molded article production industry, generally, extended cooling times are required to obtain molded articles of stable quality and free of defects. Accordingly, it is now common to achieve out-of-mold cooling of injection molded articles by using one or more post-mold devices; also, this can shorten the production time and improve the production efficiency.

As shown in fig. 1, 2, a presently preferred molding system includes an injection molding machine, a first post-mold device, a second post-mold device, and the like. The first post-molding device comprises a taking-out plate and a plurality of groups of taking-out cylinders which can clamp the bottle blank and cling to the bottle body for external cooling; the second post-mold device includes a blow core plate, a blow core, a molded article picker.

In the presently preferred molding system, the general operation is that the injected preforms are ejected from the mold cores by the ejection mechanism of the injection molding machine into the first post-mold device, which is perpendicular to the mold opening direction of the mold and can move back and forth, and the number of preforms held by each set of take-out barrels is the same as the number of preforms injected by the mold once. The first post-mold device conveys the bottle preforms to a position adjacent to the second post-mold device, when the molds are closed, the second post-mold device moves to a preset position to be combined with the take-out cylinder, the blow cores on the second post-mold device extend into the bottle preform interiors 102A and 102B to blow and cool the interiors of the groups of bottle preforms 102A and 102B, and simultaneously the molded product picker sucks one group of bottle preforms 102C which are arranged in the take-out cylinder and have the longest retention time, and simultaneously the injection molding machine injects the next group of bottle preforms. When the mold is again fully opened, the second post-mold device can be rotated 90 degrees, with the vacuum supply to the molded article picker terminated by the solenoid control valve to drop the preform 102C onto the conveyor, while the first post-mold device is again moved above the mold core in preparation for the next molding cycle to grip the injection molded preform. The area enclosed between the blow core plate and the blow core back plate is a pressure channel.

As shown in fig. 3 and 4, the presently preferred molded article picker includes a nozzle, a nozzle pad, a floating element, and a compressible spring and pressure structure. A floating element is mounted between the suction nozzle and the nozzle pad, and a recess is formed in the floating element for receiving the compressible spring, the floating element being movable between an extended position and a retracted position of the compressible spring. The suction nozzle is provided with an actuator pressure channel communicated with an inner hole of the suction nozzle; the guide portion of the floating element, the spring and the actuator pressure channel cooperate in use to provide a normally closed valve. The pressure structure comprises a normally closed valve. The normally closed valve is used to control the pneumatic connection between the pressure channel, the internal bore of the nozzle and the volume V1 enclosed by the preform and the molded article picker. The normally closed valve opens in response to pressure applied to the floating element by the preform 102C. The vacuum supply is terminated by the solenoid control valve to allow the preform 102C to exit the second post-mold device. A small gap Δ S between the end face of the mouth of the preform and the sealing surface of the molded article picker can be used to transfer the preform 102C. Wherein Δ S = S2-S1; s1 is the position when the mold is fully closed, S2 is the position after the molded article picker transfers the preform, and Δ S is typically about 5mm.

However, since the molded article picker described above includes a compressible spring, which is in extension and alternation for a long period of time, performance is degraded, thus affecting the movement of the floating element, rendering the normally closed valve ineffective, and thus failing to transfer the molded article picker from the mold to the preform. Secondly, the service life of the floating element is shortened because the floating element often collides with the contact surface of the suction nozzle. Therefore, the compressible spring and the floating member need to be replaced periodically, which increases the cost of the mold and reduces the production efficiency of the mold.

Meanwhile, in order to meet the market demand, all mold production enterprises strive to shorten the mold production period and reduce the mold manufacturing cost. In order to save cost, most of mold production enterprises increase the service time of the injection molding machine, so that the precision of the injection molding machine is reduced, and the following conditions can occur after the mold is installed: (1) As shown in fig. 5, after the mold is closed, the first post-mold device and the second post-mold device form an offset angle a; (2) As shown in fig. 6, after the mold is closed, the first post-mold device and the second post-mold device can not be closed to the preset position, and are in the position S3, and the interior of the bottle blank can not be communicated with the small hole of the suction nozzle; (3) As shown in fig. 7, after the molds are closed, the first post-mold device and the second post-mold device collide with each other to cause interference, and the preform is damaged. In either case, the molded article picker fails to transfer the preform because the end face of the mouth of the preform and the molded article picker contact surface do not form an effective enclosed volume, a sufficient vacuum is not obtained to transfer the preform when the volume is evacuated by the cooperation of the vacuum pump, and the preform stays in the second post-mold device, blocking the first post-mold device from introducing the next injected preform. In order to avoid the above-described situation, higher demands are therefore placed on the design of the mold article out-mold picker.

Disclosure of Invention

In view of the above problems, the present invention provides an out-mold pick-up device for picking up bottle preforms, which has a simple structure and can stably and reliably pick up bottle preforms.

Another object of the invention is: the utility model provides a simple structure just absorbs the reliable and stable mould of bottle base and picks up device outside the mould of bottle base.

A third object of the invention is: provides a method for stably and reliably transferring bottle blanks by sucking the bottle blanks.

The out-of-mold picking device for the bottle blank comprises a connecting head, a step for contacting with the end part of the bottle mouth of the bottle blank to provide a sealing surface when the bottle blank is picked up, and an inserting pin inserted into the bottle blank when the bottle blank is picked up; one end of the inserting pin is an inserting end, and the other end of the inserting pin is a fixed end; the step is arranged at the edge of the fixed end of the inserting pin, and the connector is arranged at the fixed end of the inserting pin; the inserting end of the inserting pin is provided with a plurality of airflow holes which penetrate through the inserting end and the fixed end of the inserting pin.

Preferably, the out-mold pick-up device for the bottle blank further comprises an outer sleeve, the outer sleeve surrounds the step and the inserting pin in a surrounding mode, and the outer sleeve is mounted on the step.

Preferably, the outer sleeve includes a cylindrical portion and a circular ring portion at an end of the cylindrical portion; the outer wall of the step is provided with an annular clamping groove, and the inner ring of the annular part of the outer sleeve is clamped into the clamping groove; the step and the insert pin are located within the cylindrical portion such that when the insert pin is inserted into the preform, a continuous gas flow path is formed between the inner wall of the cylindrical portion and the outer wall of the preform, between the step and the finish end of the preform, and between the insert pin and the inner wall of the preform.

Preferably, the connector is located at the center of the fixed end of the insert pin; the fixed end of the insert pin is provided with an air suction groove which is annularly distributed around the connector and communicated with the airflow hole.

Preferably, the insert pin comprises an insert pin part and an insert pin part which are sequentially connected, wherein the insert pin part is cylindrical, and the insert pin part is conical; the airflow hole is a cylindrical hole and is parallel to the central axis of the insertion pin, and the end part of the airflow hole is positioned on the second part of the insertion pin; the number of the airflow holes is multiple and the airflow holes are evenly distributed around the connector.

The external mold picking device for the bottle blank comprises a vacuum pump, a core blowing plate and a plurality of external mold pickers for the bottle blank, wherein the external mold pickers for the bottle blank are arranged on the core blowing plate through connectors; the core blowing plate is provided with a pressure channel, and the airflow hole, the pressure channel and the vacuum pump are communicated in sequence. Preferably, the blow core comprises a plurality of blow cores for cooling the bottle blank; the blowing core is arranged on the blowing core plate and is positioned on the same side of the blowing core plate with the out-of-mold pick-up device of the bottle blank.

Preferably, the length of the insert pin is L1; and when the blowing core is completely placed into the bottle blank to be cooled, the distance of inserting the inserting pin into the bottle blank to be taken out is L2, the moving distance of the bottle blank is L = L1-L2, and L is 2 mm-12 mm.

The method for transferring the bottle blank comprises the steps of using any one of the above-mentioned out-of-mold pickers for the bottle blank, inserting the insertion pin of the out-of-mold picker for the bottle blank into the bottle blank, simultaneously extracting vacuum, gradually evacuating the gas in the bottle blank from the bottle bottom of the bottle blank along the bottle body through the airflow hole in the out-of-mold picker for the bottle blank, evacuating the inner volume defined by the bottle blank, the insertion pin and the step to form vacuum when the end part of the bottle mouth of the bottle blank is sucked to the end face of the step, and smoothly sucking the bottle blank.

Before the bottle mouth of the bottle blank contacts the step, the gas outside the bottle blank passes through the gap between the outer sleeve and the outer part of the bottle mouth of the bottle blank and enters the bottle blank through the gap between the inserting pin and the inner part of the bottle mouth of the bottle blank, and the airflow flows through the inner part and the outer part of the bottle mouth of the bottle blank, so that the cooling effect on the bottle mouth of the bottle blank is enhanced.

The working principle of the invention is that when the mold is closed, the mold external picking device of the bottle blank moves to a preset position and is combined with the taking-out cylinder, the mold external picking device of the bottle blank extends into the bottle blank in the taking-out cylinder, and the cooperation of the electromagnetic control valve and the vacuum pump is controlled, so that the gas in the inner volume of the bottle blank flows into the pressure channel through the airflow hole and the air suction groove and is rapidly reduced, the bottle blank is rapidly pulled to the end surface of the step of the mold external picking device of the bottle blank, and the closed volume defined by the inner part of the bottle blank and the mold external picking device of the bottle blank forms vacuum, and the bottle blank is transferred into the mold external picking device of the bottle blank; the vacuum supply is terminated and the blow core plate is rotated 90 degrees to drop the preforms picked up by the out-of-mold pickers of the preforms onto the conveyor belt.

The invention has the following advantages: (1) The outer sleeve, the bottle opening of the bottle blank and the external mold picker of the bottle blank form an effective area, and outside air flows through the effective area and is introduced into the bottle blank, so that the cooling of the bottle opening of the bottle blank can be further enhanced, and the obvious crystallization phenomenon of the bottle opening of the bottle blank is reduced. (2) The inserting end of the inserting pin is provided with a plurality of airflow holes and steps for providing a sealing surface, so that gas in the bottle blank is easier to evacuate, the cooling effect of the bottle blank is good, the transparency and the uniformity of the bottle blank can be improved, and the produced bottle blank has a stable and consistent structure; moreover, the manufacturing and processing are simple and convenient, the bottle blank picking accuracy is improved, and the maintenance cost is also reduced. (3) The device has the advantages of large moving distance range of blank suction, stable and reliable blank suction and high blank taking efficiency. (4) The invention omits components such as a spring and the like, has simple structure and easy implementation, and improves blank taking failure possibly caused by using an elastic element; the parts such as the spring and the like are prevented from being replaced periodically, the time is saved, the service life of the die is prolonged, and the manufacturing cost is reduced. (5) The invention can be designed according to the size of the bottle mouth of the bottle blank, and has wide application range; in addition, the bottle blank with the specification suitable for the bottle mouth with a certain diameter range has universality in a certain range, and the production and manufacturing cost is reduced. (6) According to the invention, the first inserting pin and the second inserting pin which are sequentially connected are respectively designed into a cylinder shape and a cone shape, so that the contact area of the first inserting pin and the second inserting pin with hot air in the bottle blank is increased after the first inserting pin and the second inserting pin are inserted into the bottle blank, and the cooling speed is accelerated; meanwhile, the airflow hole is formed in the conical body, so that the opening area of the airflow hole at the insertion end is large, the airflow circulation speed is increased to a certain extent, and the bottle blank cooling and sucking speed is increased.

Drawings

FIG. 1 is a schematic view of a prior art post-mold apparatus in a mold-open state.

Fig. 2 is a schematic view of a prior art post-mold apparatus in a mold-closed state.

Fig. 3 is a cross-sectional view of a prior art molded article out-of-mold pick-up device prior to sucking a preform.

Fig. 4 is a cross-sectional view of a bottle preform sucking device of a mold product mold external picking device in the prior art.

Fig. 5 is a schematic diagram of a prior art post-mold apparatus at offset angle a during mold closing.

FIG. 6 is a cross-sectional view of a prior art post-mold apparatus with the mold clamped in an improper position.

Fig. 7 is a schematic view showing the occurrence of interference in mold clamping of a post-mold device of the prior art.

Fig. 8 is a schematic view of the bottle preform sucking state in the out-of-mold pick-up device for bottle preforms of the present invention.

Fig. 9 is a schematic view of the bottle preform sucking state in the out-of-mold bottle preform pickup apparatus of the present invention.

Fig. 10 is a cross-sectional view of the out-mold picker of the bottle preform of fig. 8.

Fig. 11 is a cross-sectional structural view of an out-mold picker for bottle preforms of the present invention.

Fig. 12 is a perspective view of an out-mold picker for bottle preforms of the present invention.

Fig. 13 is an out-of-mold picker for a jacket-less bottle preform.

Wherein 10 is a first post-mold device, 100 is a take-out plate, 101 is a take-out cylinder, 102A, 102B, 102C are bottle preforms, 103 is a molded product picker, 104 is a blow core, 105 is a blow core plate, 106 is a blow core back plate, 107 is a suction nozzle, 108 is a floating element, 109 is a nozzle pad, 110 is a pressure channel, 11 is a second post-mold device, 120 is an actuator pressure channel, 201 is a take-out cylinder, 202A, 202B, 202C are bottle preforms, 203 is an out-of-mold picker for the bottle preforms, 204 is a blow core, 205 is a blow core plate, 206 is a blow core back plate, 207 is an end face of a step, 1 is an outer sleeve, 2 is an out-mold picker of a bottle blank without a jacket, 21 is a connector, 22 is a step, 23 is a first inserting pin part, 24 is a second inserting pin part, 201 is an air suction groove, 202 is an air flow hole, D1 is the inner diameter of a bottle opening of the bottle blank 202C, D2 is the outer diameter of the first inserting pin part, S is the distance between the first inserting pin part and the inner wall of the bottle blank opening when the bottle blank is sucked, L1 is the length of the first inserting pin part, L is the moving distance of the bottle blank, S1 is the position when a mold is completely closed, S2 is the position after the bottle blank is transferred by the molded product picker, and L2 is the distance after the blow core is completely placed into the bottle blank to be cooled and the inserting pin is inserted into the bottle blank to be taken out.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

the out-mold pick-up device for the bottle blank comprises an inserting pin, a step and a connecting head. The two ends of the inserting pin are respectively defined as an inserting end and a fixed end, the inserting end is the end which extends into the bottle blank when the bottle blank is picked up, and the fixed end is the end which is near the bottle opening of the bottle blank when the bottle blank is picked up; the insertion pin is composed of a first insertion pin part and a second insertion pin part; one part of the insert pin is cylindrical and one end of the insert pin is chamfered with a round angle; the second part of the inserting pin is conical, one end of the second part of the inserting pin is provided with a round angle, and the other end of the second part of the inserting pin is connected with one end of the first part of the inserting pin, which is provided with a round angle, and is superposed with the end surface of the first part of the inserting pin, which is provided with a round angle. The edge of the inserting end of the inserting pin is provided with airflow holes which are uniformly distributed in an annular shape, the airflow holes are cylindrical holes, the airflow holes are parallel to the central axis of the inserting pin, the airflow holes penetrate through the inserting end and the fixed end of the inserting pin, and the number of the airflow holes is 4. The edge of the fixed end of the insert pin is provided with a plurality of air suction grooves which are annularly distributed around the connector and communicated with the airflow hole. The step is in a hollow cylinder shape, the diameter of the hollow cylinder in the middle of the step is equal to or slightly smaller than that of the inserted pin, the step is arranged at the edge of the fixed end of the inserted pin, the step is arranged below the end face of the inserted end of the inserted pin, and the central axis of the step is aligned with the central axis of the inserted pin. The step is used for contacting with the end part of the bottle mouth of the bottle blank in the picking process of the bottle blank, and the surface of the step, which is connected with the end part of the bottle mouth of the bottle blank, is softer and more flexible so as to enable the out-mold picking device of the bottle blank and the bottle blank to form an effective closed volume in the picking process; the surface of the step that contacts the finish end of the preform should provide a sealing surface that can easily form a seal with the finish end of the preform, such as can be made of ultra high molecular weight polyethylene (UHWPE). The connector is cylindrical, the diameter of the connector is smaller than that of the insert pin, the connector penetrates through the hollow part of the step and is installed on the end face of the fixed end of the insert pin, the central axis of the connector is aligned with that of the insert pin, and the end, far away from the insert pin, of the connector is provided with threads. The step and the connector are both arranged on the end face of one end, without the chamfer, of the first inserting pin, namely the end, which is close to the first inserting pin and is not chamfered, is a fixed end of the inserting pin, and the end, which is close to the second inserting pin and is chamfered, is an inserting end. The outer sleeve is in a barrel shape, a round hole is formed in the center of the barrel bottom, and the diameter of the round hole can be designed to be larger than that of a hollow cylinder in the middle of the step and smaller than that of the step (namely, the round hole is in a barrel shape formed by a cylindrical part and a circular ring part positioned at the end part of the cylindrical part); for the step, a thin-sheet cylindrical bulge can be arranged at one end of the step far away from the insertion section of the insertion pin; the outer mold picker of the bottle blank is placed into the outer sleeve, the connector extends out of the round hole of the outer sleeve, and the step is clamped on the barrel bottom of the outer sleeve through the cylindrical bulge and the end face, far away from the insertion end of the insertion pin, of the step, so that the outer sleeve and the outer mold picker of the bottle blank are installed into a whole.

The out-of-mold picking device for the bottle blank comprises a connecting head, a step and an inserting pin, wherein the step is used for contacting with the end part of the bottle mouth of the bottle blank to provide a sealing surface when the bottle blank is picked, and the inserting pin is inserted into the bottle blank when the bottle blank is picked; one end of the inserting pin is an inserting end, and the other end of the inserting pin is a fixed end; the step is arranged at the edge of the fixed end of the inserting pin, and the connector is arranged at the fixed end of the inserting pin; the inserting end of the inserting pin is provided with a plurality of airflow holes which penetrate through the inserting end and the fixed end of the inserting pin.

In the embodiment, the gas collecting device further comprises an outer sleeve, wherein the outer sleeve is used for collecting gas and surrounding the step and the inserting pin in a surrounding mode, and the outer sleeve is installed on the step.

The outer sleeve comprises a cylindrical part and a circular ring part positioned at the end part of the cylindrical part; the outer wall of the step is provided with a circular clamping groove, and the inner ring of the circular part of the outer sleeve is clamped in the clamping groove; the step and the insert pin are located within the cylindrical portion such that when the insert pin is inserted into the preform, a continuous gas flow path is formed between the inner wall of the cylindrical portion and the outer wall of the preform, between the step and the finish end of the preform, and between the insert pin and the inner wall of the preform. In this embodiment, in order to facilitate understanding of the scheme of the invention, the outer casing can be regarded as a drum with a circular hole in the center of the bottom, the assembled step, the insertion pin and the connector are installed in the outer casing together, the connector passes through the circular hole and extends out of the outer casing, and the step and the insertion pin are clamped by the bottom of the drum and just surrounded by the cylindrical outer casing, so that the gas is gathered in the picking process.

In this embodiment, the connector is located at the center of the fixed end of the insert pin; the fixed end of the insert pin is provided with an air suction groove which is annularly distributed around the connector and communicated with the airflow hole. The number of the air suction grooves is as many as the number of the air flow holes, and the air suction grooves are uniformly distributed around the connector in an annular shape.

In the embodiment, the inserting pin comprises a first inserting pin part and a second inserting pin part which are sequentially connected, wherein the first inserting pin part is cylindrical, and the second inserting pin part is conical; the air flow hole is a cylindrical hole and is parallel to the central shaft of the insert pin, and the end part of the air flow hole is positioned on the second part of the insert pin; the number of the airflow holes is multiple and the airflow holes are evenly distributed around the connector. The air flow holes parallel to the central axis of the inserted pins are arranged, the path of the air flow is shortest, the blank suction is accelerated, and the time is saved in the production.

The second embodiment:

the device for picking the bottle blank outside the mold comprises a vacuum pump and a core blowing plate, and adopts the device for picking the bottle blank outside the mold of the first embodiment. The external mold picker of the bottle blank is arranged on the blow core plate through a connector; the core blowing plate is provided with a pressure channel, and the airflow hole, the pressure channel and the vacuum pump are communicated in sequence.

A plurality of channels are arranged on one core blowing plate, and the pressure channels are formed between the lower surface of the core blowing plate and a core blowing back plate; the external mold picker of the bottle blank is arranged on the blow core plate through a connector; the vacuum pump is connected with the pressure channel through a conduit; therefore, the airflow hole, the pressure channel and the vacuum pump are sequentially communicated to form a channel for airflow to pass through.

The method for transferring the bottle blank by using the external mold picker of the bottle blank is characterized in that the inserting pin of the external mold picker of the bottle blank is inserted into the bottle blank, vacuum is simultaneously extracted, gas in the bottle blank is gradually pumped out from the bottom of the bottle blank along the bottle body through the airflow hole in the external mold picker of the bottle blank, when the end part of the bottle mouth of the bottle blank is sucked to the end face of the step, the internal volume defined by the bottle blank, the inserting pin and the step is pumped out to form vacuum, and the bottle blank is smoothly sucked.

Ejecting the injected bottle blanks from the mold core through an ejection mechanism of the injection molding machine, wherein the bottle blanks subjected to injection molding are arranged in a rectangular array; the first post-mold device includes a take-out plate and take-out barrels arranged in a row on the take-out plate, the number and spacing of the take-out barrels being the same as one row of the bottle preforms arranged in a rectangular array. The first molding post-device takes out a row of bottle blanks for clamping; then, the external mold picking device of the bottle blank moves to a preset position to be combined with the taking-out cylinder, the external mold picking device of the bottle blank extends into the bottle blank in the taking-out cylinder, and the cooperation of the electromagnetic control valve and the vacuum pump is controlled to enable the gas in the internal volume of the bottle blank to flow into the pressure channel through the airflow hole and the air suction groove, so that the gas in the internal volume of the bottle blank is rapidly reduced, the bottle blank is rapidly pulled to the end surface of the step of the external mold picking device of the bottle blank, the closed volume defined by the internal portion of the bottle blank and the external mold picking device of the bottle blank is enabled to form vacuum, and the bottle blank is transferred into the external mold picking device of the bottle blank; the vacuum supply is terminated and the blow core plate is rotated 90 degrees to drop the preforms picked up by the out-of-mold pickers of the preforms onto the conveyor belt. After that, the first post-mold device takes out a row of bottle blanks, and the out-mold pick-up device repeats the process for a plurality of times until all the bottle blanks arranged in a rectangular array are taken out.

The cooling process and principle of the bottle mouth of the bottle preform during the picking process are described and recorded in detail in the third embodiment, and will not be described repeatedly.

Example three:

the device for picking the bottle blank out of the mold comprises a vacuum pump and a core blowing plate, and adopts the device for picking the bottle blank out of the mold in the first embodiment. The external mold picker of the bottle blank is fixedly arranged on the blow core plate through a connector; the pressure channel is arranged on the core blowing plate, and the airflow hole, the pressure channel and the vacuum pump are communicated in sequence; the blow core is used for cooling the bottle blanks; the blowing core is arranged on the blowing core plate and is positioned on the same side of the blowing core plate with the external mould picker of the bottle blank.

As shown in fig. 8 and 9, in the present embodiment, a plurality of channels are formed on one blow core plate, and the pressure channels are formed between the lower surface of the blow core plate and the blow core back plate; two blowing cores are arranged between each channel; installing an external mold picker of the bottle blank on the blow-core plate above the pressure channel through a connector; the vacuum pump is connected to the pressure channel through a conduit, and the pressure channel is communicated with the airflow hole of the out-mold picker of the bottle blank; the distance between the blowing core and the blowing core on the blowing core plate and the distance between the blowing core and the off-mold picker of the bottle blank on the blowing core plate are the same. The blowing core extends into the bottle blank clamped by the taking-out cylinder during working and cools the bottle blank; when the out-mold picking device of the bottle blank works, the out-mold picking device stretches into the bottle blank clamped by the taking-out cylinder and sucks the bottle blank; during suction, the vacuum pump is controlled by the electromagnetic control valve to pump gas to the closed volume defined by the interior of the bottle blank and the bottle blank out-mold pickup device through the pressure channel to form vacuum, and the bottle blank is transferred to the bottle blank out-mold pickup device.

A method of using the out-of-mold picker for bottle preforms of example one: the inserting pin of the external mold picker of the bottle blank is inserted into the bottle blank, vacuum is simultaneously pumped, gas in the bottle blank is gradually pumped out along the bottle body from the bottle bottom of the bottle blank through the airflow hole in the external mold picker of the bottle blank, when the end part of the bottle mouth of the bottle blank is sucked to the end surface of the step, the internal volume defined by the bottle blank, the inserting pin and the step is pumped out to form vacuum, and the bottle blank is smoothly sucked.

And the gas outside the bottle blank passes through the gap between the outer sleeve and the outside of the bottle opening of the bottle blank and enters the inside of the bottle blank through the gap between the insert pin and the inside of the bottle opening of the bottle blank, and the airflow flows through the inside and the outside of the bottle opening of the bottle blank, so that the cooling effect on the bottle opening of the bottle blank is enhanced.

Fig. 8 and 9 are cross-sectional views of an extramold pick-up device for preforms using the present invention. In the following, the working process and working principle of the present embodiment are further described, the out-mold pick-up device for bottle preforms comprises several groups, one group comprises two blow cores and an out-mold pick-up device for bottle preforms according to the first embodiment. The outer mold pick-up device and the blowing core of the bottle blank are vertically arranged on the blowing core plate. The following section is represented by a group, and the working process of the out-mold pick-up device for the bottle preforms is described, but the out-mold pick-up device for actually operating one bottle preform can comprise a plurality of groups, the working process and principle of each group are the same, and the working of each group is synchronous and independent. The out-of-mold pick-ups of the blow core and the preforms cooperate respectively with the three take- off cylinder preforms 201A, 202B, 202C held by the first post-mold device. The matched use of the external mold picker and the jacket of the bottle blank further strengthens the cooling of the bottle opening of the bottle blank by allowing gas for cooling the inside of the bottle blank to flow through the bottle opening of the bottle blank and the inside of the jacket. As shown in fig. 11, the gas inside and outside the preform is pumped by a vacuum pump. When drawing, as shown by the hollow arrows in fig. 11, the outside air is introduced into the bottle blank 202C through the region surrounded by the inside of the outer sleeve, the step and the insert pin and flows through the gap S (i.e., the outside air forms a continuous gas flow path between the inner wall of the cylindrical portion and the outer wall of the bottle blank, between the step and the end of the bottle mouth of the bottle blank, and between the insert pin and the inner wall of the bottle blank), where S = (D1-D2)/2, D1 is the inner diameter of the bottle mouth of the bottle blank 202C, D2 is the outer diameter of a portion of the insert pin, and S is preferably 0.25 to 2mm. And then the air is discharged through four air flow holes of the external mold picking device of the bottle blank, so that the inside of the bottle blank is cooled. Such treatment enhances the cooling of the inside and outside of the mouth of the preform. As shown by the solid arrows in fig. 11, the gas in the internal volume V2' of the preform flows into the gas flow holes in the mouthpiece, cooling the inside of the body of the preform. All the gas flowing through the four gas flow holes flows into the pressure channel through the gas suction groove, the gas in the internal volume V2' of the bottle preform is rapidly reduced, the bottle preform 202C is rapidly pulled to the end face of the step, and the bottle preform moving distance L is about 5mm. Wherein L = L1-L2, L1 is the length of the inserting pin, L2 is the distance of the inserting pin inserted into the bottle embryo to be taken out after the blowing core is completely placed into the bottle embryo to be cooled, and L can be preferably 2 mm-12 mm. Then, a pressure channel which is formed between the lower surface of the blowing core plate and the blowing core back plate and is communicated with the interior of the out-mold picker of the bottle blank is connected with a vacuum pump through a conduit, and the vacuum pump is controlled by an electromagnetic control valve to ensure that the bottle blank and a closed volume V3' defined by the interior of the out-mold picker of the bottle blank form vacuum, so that the bottle blank 202C is transferred into the out-mold picker of the bottle blank. In the example of fig. 8 and 9, the take-out drum holds a set of preforms 202A, 202B, 202C all the time, continuing three molding cycles, after which the off-mold pickers of the preforms are merged with the take-out drum, which picks up the preforms 202A, 202B, 202C. Then, the out-of-mold pick-up device of the preforms rotates 90 degrees and drops the preforms 202A, 202B, 202C held by the out-of-mold pick-up device of the preforms onto the conveyor belt.

Ejecting the injected bottle blanks from the mold core through an ejection mechanism of the injection molding machine, wherein the bottle blanks subjected to injection molding are arranged in a rectangular array; the first post-mold device includes a take-out plate and take-out barrels arranged in a row on the take-out plate, the number and spacing of the take-out barrels being the same as one row of the bottle preforms arranged in a rectangular array. A row of bottle blanks are taken out for clamping after the first molding; then, the take-out cylinder always holds a line of bottle blanks (including several groups, one group of three bottle blanks), the out-mold pick-up device of the bottle blanks in the embodiment moves to a preset binding position to be combined with the take-out cylinder, the blow core extends into the bottle blanks in the take-out cylinder to cool, the out-mold pick-up device of the bottle blanks extends into the bottle blanks in the take-out cylinder, three molding cycles are continued, one group of three bottle blanks are sucked by the out-mold pick-up device of the bottle blanks, one line (namely several groups) of bottle blanks are all sucked by the out-mold pick-up device of the bottle blanks, and the out-mold pick-up device of the bottle blanks rotates by 90 degrees and drops the bottle blanks (one line of bottle blanks) held by the out-mold pick-up device of the bottle blanks onto the conveying belt. And then, the first post-molding device takes out a line of bottle blanks, the out-of-mold picking device of the bottle blanks absorbs the bottle blanks on the first post-molding device according to the description, and the operation is repeated for a plurality of times until all the bottle blanks ejected from the mold core by the ejection mechanism of the injection molding machine are absorbed and fall onto a conveyor belt, and the production process of a complete round is finished. After that, the injection molding machine starts to inject a new bottle blank again.

The above is only a preferred embodiment of the present invention, and the out-mold picker for bottle preforms of the present invention can also be manufactured by an integral molding method, and is not limited to the installation method described in this embodiment.

In addition to the embodiments mentioned in the above, the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

Claims (8)

1. The extramold picker of bottle base, its characterized in that: the bottle blank picking device comprises a connecting head, a step for contacting with the end part of a bottle mouth of a bottle blank to provide a sealing surface when the bottle blank is picked up, and an inserting pin inserted into the bottle blank when the bottle blank is picked up; one end of the inserting pin is an inserting end, and the other end of the inserting pin is a fixed end; the step is arranged at the edge of the fixed end of the inserting pin, and the connector is arranged at the fixed end of the inserting pin; the inserting end of the inserting pin is provided with a plurality of airflow holes which penetrate through the inserting end and the fixed end of the inserting pin;

the out-of-mold picker of the bottle blank also comprises an outer sleeve, wherein the outer sleeve gathers gas and surrounds the step and the inserting pin in a surrounding manner, and the outer sleeve is arranged on the step;

the outer sleeve comprises a cylindrical part and a circular ring part positioned at the end part of the cylindrical part; the outer wall of the step is provided with a circular clamping groove, and the inner ring of the circular part of the outer sleeve is clamped in the clamping groove; the step and the insert pin are located within the cylindrical portion such that when the insert pin is inserted into the preform, a continuous gas flow path is formed between the inner wall of the cylindrical portion and the outer wall of the preform, between the step and the finish end of the preform, and between the insert pin and the inner wall of the preform.

2. The out-of-mold pick-up of preforms as claimed in claim 1, wherein: the connector is positioned at the center of the fixed end of the insert pin; the fixed end of the insert pin is provided with an air suction groove which is annularly distributed around the connector and communicated with the airflow hole.

3. The out-of-mold picker for bottle preforms claimed in claim 2, wherein: the inserting pin comprises a first inserting pin part and a second inserting pin part which are sequentially connected, wherein the first inserting pin part is cylindrical, and the second inserting pin part is conical; the airflow hole is a cylindrical hole and is parallel to the central axis of the insertion pin, and the end part of the airflow hole is positioned on the second part of the insertion pin; the number of the airflow holes is multiple, and the airflow holes are evenly distributed around the connector.

4. An out-of-mold pick-up device for bottle preforms, comprising a vacuum pump, a blow core plate and a plurality of out-of-mold pick-ups for bottle preforms according to any one of claims 1 to 3, characterized in that: the external mold picker of the bottle blank is arranged on the blow core plate through a connector; the core blowing plate is provided with a pressure channel, and the airflow hole, the pressure channel and the vacuum pump are communicated in sequence.

5. The out-of-mold pick-up device for preforms according to claim 4, wherein: the blow core is used for cooling the bottle blanks; the blowing core is arranged on the blowing core plate and is positioned on the same side of the blowing core plate with the external mould picker of the bottle blank.

6. The out-of-mold pick-up device for preforms according to claim 5, characterized in that: the length of the insert pin is L1; and after the blowing core is completely placed into the bottle blank to be cooled, the distance of inserting the inserting pin into the bottle blank to be taken out is L2, the moving distance of the bottle blank is L = L1-L2, and L is 2 mm-12 mm.

7. Method for transferring preforms using an out-of-mold pick-up of preforms according to any one of claims 1 to 3, characterized in that: the inserting pin of the external mold picker of the bottle blank is inserted into the bottle blank, vacuum is simultaneously pumped, gas in the bottle blank is gradually pumped out along the bottle body from the bottle bottom of the bottle blank through the airflow hole in the external mold picker of the bottle blank, when the end part of the bottle mouth of the bottle blank is sucked to the end surface of the step, the internal volume defined by the bottle blank, the inserting pin and the step is pumped out to form vacuum, and the bottle blank is smoothly sucked.

8. The method for transferring preforms according to claim 7, characterized in that: before the bottle mouth of the bottle blank contacts the step, the gas outside the bottle blank passes through the gap between the outer sleeve and the outside of the bottle mouth of the bottle blank and enters the inside of the bottle blank through the gap between the inserting pin and the inside of the bottle mouth of the bottle blank, and the airflow flows through the inside and the outside of the bottle mouth of the bottle blank, so that the cooling effect on the bottle mouth of the bottle blank is enhanced.

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