CN119217640B

CN119217640B - Plastic forming device and plastic forming method

Info

Publication number: CN119217640B
Application number: CN202411732122.XA
Authority: CN
Inventors: 王立雷; 乌力吉; 王洋; 马连东
Original assignee: Tianjin Zhonghuan Xinyu Technology Co ltd
Current assignee: Tianjin Zhonghuan Xinyu Technology Co ltd
Priority date: 2024-11-29
Filing date: 2024-11-29
Publication date: 2025-03-28
Anticipated expiration: 2044-11-29
Also published as: CN119217640A

Abstract

The invention discloses a plastic molding device and a plastic molding method, wherein the plastic molding device comprises a device base, a fixed die, a movable die and an injection molding mechanism, a molding cavity is formed by die assembly between the fixed die and the movable die, an injection molding pipeline A is arranged at one side of the fixed die far away from the movable die, an adding mechanism is arranged in the fixed die, the adding mechanism comprises a sealing material box, a release agent pipeline and a material supplementing material box, the injection molding mechanism comprises an injection molding pipeline B, a die locking mechanism is symmetrically arranged outside the device base and comprises a locking block, and a fixed die ejector rod group and a movable die ejector rod group are respectively arranged in the fixed die and the movable die. According to the invention, the release agent can be independently added into the molding cavity before injection molding to reduce the release resistance, so that the damage to a workpiece caused by subsequent release is avoided, and the two locking blocks can be slidably locked on the outer side of the movable mold in a mold closing state, so that the phenomenon that a product is flash caused by the expansion of the mold in the mold closing state is avoided, and the automatic release can be performed in the mold opening process.

Description

Plastic forming device and plastic forming method

Technical Field

The invention relates to the technical field of plastic molding, in particular to a plastic molding device and a plastic molding method.

Background

The plastic product is made up by using the mixture of synthetic resin and various additives as raw material and adopting the processes of injection, extrusion, blow moulding, plastic-sucking, mould-pressing or calendaring, etc. The injection molding is also called injection molding, and is a main method for molding thermoplastic plastics, and the injection molding method is divided into plunger injection molding and screw injection molding, and the screw injection molding is the most common method for mass production of plastic parts. The working process of the screw injection molding method is that granular plastic is fed into a heated charging barrel from a hopper of an injection molding machine, so that the granular plastic is heated and melted in the charging barrel to become viscous fluid melt, then the melt is pushed by a screw of the injection molding machine to be injected into a mold cavity through a nozzle under high pressure, after pressure maintaining and cooling shaping for a certain time, the melt can keep the shape endowed by the mold cavity, and then a molded plastic part can be obtained by mold opening and ejection.

Through searching, the invention patent with the Chinese patent number of CN 114919123B discloses an injection molding device, which comprises an injection device, a cylinder, a screw rod, a molding die, a demolding mechanism and a supporting guide seat, wherein a heating device is arranged outside the cylinder, one end of the cylinder is a cylinder nozzle, the cylinder nozzle is connected with the molding die, the molding die is connected with the demolding mechanism, the molding die is also connected with a cooling system, a preheating pipe is wound in the supporting guide seat, the preheating pipe is connected with the cooling system, the preheating pipe is communicated with a circulating pipe, the circulating pipe is wound in the heating device, a heat conducting wire is wound on the screw rod, one end of the heat conducting wire is fixed, and the other end of the heat conducting wire extends to a cylinder material port and the inner side wall of the injection device. Compared with the prior art, the invention patent with the Chinese patent number CN 114919123B can prevent the blockage of a material port through pipeline circulation and the heat conducting wire, and can avoid the condition of poor forming quality caused by suddenly cooling the molten material, namely has the effect of improving the quality of a finished product.

However, in the process of demolding, the demolding mechanism in the injection molding device is used for mechanically ejecting a workpiece by virtue of the ejector rod in the demolding mechanism, so that the workpiece is easy to damage, the wiping of the demolding agent is performed manually before injection molding, the working efficiency is seriously affected, the movable mold in the demolding mechanism is used for maintaining the mold at the stage of separating Zhang Moli and the closing force applied on the mold in the stage of injection and pressure maintaining, the locking force of the movable mold is affected by fluctuation or pressure relief phenomenon of the oil pressure in the hydraulic rod, so that the quality of the workpiece is affected, and the workpiece after demolding possibly remains at the inner side of the fixed mold due to the existence of demolding resistance, so that the plastic molding device capable of adding the demolding agent at the inner side of the mold to reduce damage, mechanically locking the movable mold and autonomously demolding is needed.

Disclosure of Invention

The invention aims to solve the defects that in the prior art, the working efficiency is seriously affected by manually wiping a release agent, the locking force of a movable die is influenced by hydraulic locking of the movable die, and the inner side of a fixed die is difficult to perform autonomous release, and provides a plastic forming device and a plastic forming method.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

A plastic molding device comprises a device base, a fixed die, a movable die and an injection molding mechanism, wherein the fixed die, the movable die and the injection molding mechanism are arranged at the top of the device base, a molding cavity is formed by clamping the fixed die with the movable die, an injection molding pipeline A is arranged at one side of the fixed die far away from the movable die, an adding mechanism for adding a release agent into the molding cavity through the injection molding pipeline A is arranged in the fixed die, the adding mechanism comprises a sealing material box embedded in the fixed die, a release agent pipeline fixedly communicated with the bottom of the sealing material box and a material supplementing box fixedly connected with the top of the fixed die, a pushing piston is arranged in the sealing material box, a material supplementing pipe is fixedly communicated between the sealing material box and the material supplementing box, a sealing ring plate and an inward-bias sealing plate are arranged in the butt joint groove, the injection molding mechanism comprises an injection molding pipeline B fixedly communicated with the outside of a heating material cylinder, the injection molding pipeline B can be tightly inserted into the injection molding pipeline A, two symmetrical ejector pin mechanisms are arranged outside the device base, and the fixed die and the movable die is respectively connected with the movable die, and the movable die is provided with a locking mechanism.

The technical scheme further comprises the following steps:

The inside of the cooling pipeline group can continuously feed water through a water pump so as to achieve the purpose of cooling and auxiliary molding of a workpiece in the molding cavity.

The injection molding mechanism further comprises a forward and backward hydraulic rod arranged on the inner side of the device base and a sliding base station which is connected to the top of the device base in a sliding mode, the output end of the forward and backward hydraulic rod is fixedly connected with the sliding base station, the heating charging barrel is fixedly connected to the top of the sliding base station, a hopper is arranged on the top of the heating charging barrel, the injection molding hydraulic rod is arranged on the inner side of the sliding base station, the output end of the injection molding hydraulic rod is fixedly connected with a pushing motor, the output shaft of the pushing motor is fixedly connected with a pushing screw rod, the end portion of the pushing screw rod is provided with an injection molding nozzle, the sliding base station can drive the injection molding pipeline B to be inserted into or separated from the inside of the injection molding pipeline A through the telescopic forward and backward hydraulic rod, the pushing motor can enable the pushing screw rod to push particle plastics falling from the inside of the hopper into a heating zone to heat, and enable the injection molding nozzle and the pushing screw rod to conduct forward injection molding, stop position maintaining and backward feeding in the heating charging through the telescopic injection molding hydraulic rod.

The inner side of the sealing feed box and the outer side of the pushing piston are respectively provided with an electromagnet block A and an iron connecting block A which are opposite in position, the electromagnet block A is electrified to adsorb the iron connecting block A, a reset spring group A is fixedly connected between the pushing piston and the sealing feed box, a one-way valve is arranged outside the material supplementing pipe, the bottom of the butt joint groove is communicated with a sealing sliding groove, the sealing ring plate is slidably connected inside the sealing sliding groove, the inner part of the sealing sliding groove and the bottom of the sealing ring plate are respectively provided with an electromagnet block B and an iron connecting block B which are opposite in position, a reset spring group B is fixedly connected between the sealing ring plate and the sealing sliding groove, the electromagnet block A is electrified to enable a release agent to enter the inner part of a forming cavity through an injection molding pipeline A, and the electromagnet block A is electrified to enable the release agent pipeline to suck the release agent in the forming cavity.

The inner side of the injection molding pipeline A is provided with a touch switch A connected with an electromagnet block A power-on circuit and a touch switch B connected with an electromagnet block B power-on circuit, the outer side of the injection molding pipeline B is provided with a through groove, the inner side of the through groove is provided with an outward-deflection abutting plate, the outer side of the injection molding pipeline B is also provided with an abutting groove, and when the injection molding pipeline B is inserted into the injection molding pipeline A, the touch switch A and the long touch switch B can be touched in a short time, so that a release agent enters the inside of a molding cavity and the injection molding pipeline A is opened.

The mold locking mechanism further comprises a fixing frame A fixedly connected to the top of the device base and a damping rod capable of rotating at the top of the device base in a damping mode, an engagement toothed bar A fixedly connected with the locking block is symmetrically and slidingly connected to the outer portion of the fixing frame A, an engagement gear A engaged with the engagement toothed bar A is symmetrically and fixedly connected to the outer portion of the damping rod, an engagement gear B is fixedly connected to the middle portion of the damping rod, an engagement toothed bar B is arranged on the outer portion of the engagement gear B, the engagement toothed bar B is fixedly connected with the heating cylinder and the sliding base through the connecting frame A, and when the sliding base drives the injection molding pipeline B to be inserted into the injection molding pipeline A through extending and advancing and retreating hydraulic rods, the locking block can be slidingly locked on the outer side of a movable mold in a mold closing state.

The connecting piece comprises a fixed frame B fixedly connected to the outside of the fixed die or the movable die, a limiting frame fixedly connected to the outside of the fixed die ejector rod group or the movable die ejector rod group and a butt frame fixedly connected to the end part of the fixed die ejector rod group or the movable die ejector rod group, the butt frame B symmetrically and fixedly connected to the outside of the fixed die is pushed and pulled by the movable die, the butt frame outside the movable die is extruded by the inner side of the device base, and when the movable die and the fixed die are opened by shortening a die hydraulic rod, the movable die can enable the fixed die ejector rod group and the movable die ejector rod group to be mutually close to each other through the connecting piece for ejection and demolding.

A plastic molding method adopts the plastic molding device, and comprises the following steps:

firstly, extending a die hydraulic rod to enable a movable die and a fixed die to be clamped to form a forming cavity, and then extending a driving and reversing hydraulic rod to enable an injection molding pipeline B to be inserted into an injection molding pipeline A, so that a connecting frame A drives a locking block to be locked on the outer side of the movable die in a clamping state in a sliding mode, then enabling the injection molding pipeline B to touch a touch switch A and a long touch switch B in a short mode, enabling the inner wall of the forming cavity to be adhered with a release agent in a short mode, and enabling a sealing ring plate to be retracted into a sealing chute in a long mode by touch of the touch switch B;

Starting a pushing motor after the injection molding pipeline B completely enters the injection molding pipeline A to enable a pushing screw rod to rotate so as to push melt into the front end of a heating feed cylinder and the front end of an injection molding nozzle, and then enabling the injection molding nozzle and the pushing screw rod to advance in the heating feed cylinder for injection molding by extending an injection molding hydraulic rod so as to enable the melt to enter the inside of a molding cavity through the injection molding pipeline A, wherein water is continuously fed into the cooling pipeline group in the injection molding process to cool the melt in the molding cavity to assist in molding of a workpiece, and the injection molding hydraulic rod stops extending after injection molding is completed so as to enable the injection molding nozzle and the pushing screw rod to stop positioning and pressure maintaining;

step three, after cooling and molding a workpiece in a cavity to be molded, shortening a feeding and discharging hydraulic rod to separate an injection molding pipeline B from the injection molding pipeline A, and starting a pushing motor and shortening the injection molding hydraulic rod to enable an injection molding nozzle and a pushing screw to rotate and to retreat for retreating feeding;

And fourthly, after the injection mechanism is reset, shortening a die hydraulic rod to enable the movable die and the fixed die to be opened, enabling the fixed die ejector rod group to extend out of the fixed die for ejection and demolding, enabling the movable die ejector rod group to extend out of the movable die for ejection and demolding, and thus completing injection molding of the workpiece.

The invention has the following beneficial effects:

1. According to the invention, before the injection molding pipeline B is spliced with the inside of the injection molding pipeline A by extending the advancing and retreating hydraulic rod so as to realize injection molding, the injection molding pipeline B can be used for enabling the release agent in the sealing material box to enter the inside of the forming cavity through the release agent pipeline and the injection molding pipeline A and fully fill the forming cavity, and then enabling the pushing piston to reset so as to enable the release agent pipeline to generate suction force and enable the release agent in the forming cavity to be sucked into the inside of the sealing material box, so that the release agent is adhered to the inner wall of the forming cavity, namely, the release agent can be independently added into the inside of the forming cavity before injection molding so as to reduce release resistance and avoid damage to a workpiece caused by subsequent release.

2. According to the invention, before injection molding is realized by extending the advancing and retreating hydraulic rod to enable the injection molding pipeline B to be inserted into the injection molding pipeline A, the symmetrical connecting frame A can drive the symmetrical two locking blocks to slide and lock on the outer side of the movable mould in a mould closing state through the meshing toothed bar B, the meshing gear B, the damping bar, the meshing gear A and the meshing toothed bar A, at the moment, the unlocking directions of the symmetrical two locking blocks are opposite to Zhang Mofang directions of the movable mould, so that the hydraulic rod of the mould independently resists Zhang Moli in the subsequent injection molding and pressure maintaining stages and maintains the closing force applied to the movable mould, and the phenomenon that the product is flash caused by the expansion of the mould in the mould closing state can be avoided.

3. According to the invention, the fixed die ejector rod group can extend out of the fixed die and then the movable die ejector rod group extends out of the movable die for demolding by shortening the die hydraulic rod for die opening, namely, a workpiece attached in the fixed die can be ejected and demolded through the extended fixed die ejector rod group, the movable die ejector rod group is empty, a workpiece attached in the movable die can be ejected and demolded through the extended movable die ejector rod group, the fixed die ejector rod group is empty, namely, autonomous demolding can be performed in the die opening process, and the influence of double-sided ejection on the appearance of the workpiece can be avoided in the demolding process.

Drawings

FIG. 1 is a schematic view of a plastic molding apparatus according to the present invention;

FIG. 2 is a first schematic structure of a first embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the structure shown in FIG. 2A;

FIG. 4 is a second schematic diagram of the first embodiment of the present invention;

FIG. 5 is an enlarged schematic view of the structure shown at B in FIG. 4;

FIG. 6 is an enlarged schematic view of the structure at C in FIG. 4;

FIG. 7 is a third schematic diagram of a first embodiment of the present invention;

FIG. 8 is an enlarged schematic view of the structure shown at D in FIG. 6;

Fig. 9 is a first schematic structural view of a second embodiment of the present invention;

FIG. 10 is an enlarged schematic view of the structure of FIG. 9 at E;

FIG. 11 is a second schematic diagram of a second embodiment of the present invention;

FIG. 12 is an enlarged schematic view of the structure shown at F in FIG. 11;

fig. 13 is a first schematic structural view of a third embodiment of the present invention;

fig. 14 is a second structural diagram of a third embodiment of the present invention.

1, A device base; 2, fixing the mold; 3, a movable mould; 4, injection mechanism, 401, heating cylinder, 402, injection pipeline B, 4021, passing groove, 4022, external offset abutting plate, 4023, abutting groove, 403, advancing and retreating hydraulic rod, 404, sliding base, 405, hopper, 406, injection hydraulic rod, 407, pushing motor, 408, pushing screw, 409, injection nozzle, 5, forming cavity, 6, injection pipeline A, 7, adding mechanism, 701, sealing material box, 702, release agent pipeline, 703, supplementing material box, 704, pushing piston, 705, supplementing material pipe, 706, abutting groove, 707, sealing ring plate, 708, internal offset sealing plate, 709, electromagnet block A, 710, connecting iron block A, 711, reset spring set A, 712, one-way valve, 713, sealing chute, 714, electromagnet block B, 715, connecting iron block B, 716, reset spring set B, 717, trigger switch A, 718, switch B, 8, locking mechanism, 801, locking block, 802, fixing frame A, damping rod, 804, tooth rod A, 805, tooth rack B, tooth rack, and 13, 11, and the connecting block, the connecting iron block, the lifting bar, the lifting, and the lifting, the, the.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

As shown in fig. 1-8, the plastic forming device provided by the invention comprises a device base 1, a fixed die 2, a movable die 3 and an injection mechanism 4, wherein the fixed die 2, the movable die 3 and the injection mechanism 4 are arranged at the top of the device base 1, the fixed die 2 is fixedly connected at the top of the device base 1, the movable die 3 is slidably connected at the top of the device base 1, a die hydraulic rod 12 is arranged at the outer part of the movable die 3, cooling pipeline groups 13 are arranged in the fixed die 2 and the movable die 3, the cooling pipeline groups 13 can continuously feed water through a water pump so as to achieve the purpose of cooling auxiliary forming of a part in a forming cavity 5, a forming cavity 5 is formed by clamping the fixed die 2 and the movable die 3, an injection pipeline A6 is arranged at one side, far away from the movable die 3, of the fixed die 2, of the injection mechanism 4 comprises an injection pipeline B402 fixedly communicated at the outer part of a heating charging barrel 401, the injection pipeline B402 can be tightly spliced in the injection pipeline A6, and the outer part of the heating barrel 401 is provided with a liquid for heating and melting granular plastic in the heating barrel 401 into a viscous state melt;

The injection mechanism 4 further comprises a forward and backward hydraulic rod 403 arranged on the inner side of the device base 1 and a sliding base 404 connected to the top of the device base 1 in a sliding manner, an output end of the forward and backward hydraulic rod 403 is fixedly connected with the sliding base 404, a heating material cylinder 401 is fixedly connected to the top of the sliding base 404, a hopper 405 is arranged on the top of the heating material cylinder 401, the sliding base 404 can drive an injection pipeline B402 to be inserted into or separated from an injection pipeline A6 through the telescopic forward and backward hydraulic rod 403, an injection hydraulic rod 406 is arranged on the inner side of the sliding base 404, the output end of the injection hydraulic rod 406 is fixedly connected with a pushing motor 407, an output shaft of the pushing motor 407 extends to the inside of the heating material cylinder 401 and is fixedly connected with a pushing screw 408, an injection nozzle 409 is arranged at the end part of the pushing screw 408, granular plastic falling from the inside of the hopper 405 can be pushed into a heating zone to be heated by starting the pushing motor 407, and the injection nozzle 409 and the pushing screw 408 can be enabled to advance, injection, stop, pressure and backward feeding in the heating material cylinder 401 through the telescopic injection hydraulic rod 406;

The inside of the fixed die 2 is provided with an adding mechanism 7 for adding a release agent into the forming cavity 5 through an injection molding pipeline A6, the adding mechanism 7 comprises a sealing material box 701 embedded in the fixed die 2, a release agent pipeline 702 fixedly communicated with the bottom of the sealing material box 701 and a material supplementing material box 703 fixedly connected to the top of the fixed die 2, a pushing piston 704 is arranged in the sealing material box 701, a material supplementing pipe 705 is fixedly communicated between the sealing material box 701 and the material supplementing material box 703, a one-way valve 712 is arranged outside the material supplementing pipe 705, the release agent in the material supplementing material box 703 can enter the inside of the sealing material box 701 through the material supplementing pipe 705 for material supplementing, a butt joint groove 706 is arranged at the communicating position of the release agent pipeline 702 and the injection molding pipeline A6, a sealing ring plate 707 and an inward-deflection sealing plate 708 are arranged in the inside of the butt joint groove 706, the bottom of the butt joint groove 706 is communicated with a sealing sliding groove 713, the sealing ring plate 707 is in the inside of the sealing sliding groove 713, and the inward-deflection sealing plate 708 can deflect inwards only;

An electromagnet block A709 and an electromagnet block A710 which are opposite in position are respectively arranged on the inner side of the sealing material box 701 and the outer side of the pushing piston 704, the electromagnet block A709 is electrified to adsorb the electromagnet block A710, the electromagnet block A709 is electrified to enable the pushing piston 704 to push the release agent in the sealing material box 701 into the release agent pipeline 702, the release agent entering into the release agent pipeline 702 enters into the interior of the forming cavity 5 through the injection molding pipeline A6, a reset spring group A711 is fixedly connected between the pushing piston 704 and the sealing material box 701, the electromagnet block A709 is powered off to enable the reset spring group A711 to drive the pushing piston 704 to reset, the release agent pipeline 702 is enabled to suck the release agent in the forming cavity 5 into the sealing material box 701, an electromagnet block B714 and an electromagnet block B715 are respectively arranged in the interior of the sealing chute 713 and at the bottom of the sealing ring plate 707, the electromagnet block B714 is enabled to enter into the interior of the sealing chute 713 and not to be abutted against the inner bias sealing plate 708, and the reset spring group A711 is fixedly connected between the sealing plate 707 and the sealing chute 713, and the reset spring group B716 is enabled to drive the reset spring group B716 to reset;

The inside of the injection molding pipeline A6 is provided with a touch switch A717 connected with an electromagnet block A709 power-on circuit and a touch switch B718 connected with an electromagnet block B714 power-on circuit, the outside of the injection molding pipeline B402 is provided with a through groove 4021, the inside of the through groove 4021 is provided with an external offset abutting plate 4022, the outside of the injection molding pipeline B402 is also provided with an abutting groove 4023, when the injection molding pipeline B402 is inserted into the injection molding pipeline A6, the touch switch A717 and the long touch switch B718 can be touched in a short time, so that a release agent enters the inside of the molding cavity 5 and the injection molding pipeline A6 is opened.

In this embodiment: firstly, the movable mold 3 and the fixed mold 2 are clamped by extending the mold hydraulic rod 12 to form a forming cavity 5, then, the sliding base 404 drives the injection molding pipeline B402 to be inserted into the injection molding pipeline A6 by extending the advance and retreat hydraulic rod 403, in the process, the injection molding pipeline B402 can short touch the touch switch A717 and the long touch switch B718, in the process of short touch the touch switch A717, the external bias abutting plate 4022 which is in the injection molding pipeline A6 along with the injection molding pipeline B402 is abutted against the touch switch A717 to enable the electromagnet block A709 to be electrified, the electromagnet block A709 is electrified to absorb the iron connecting block A710 and drive the pushing piston 704 to compress the reset spring set A711, so that the release agent in the sealing material box 701 is extruded into the release agent pipeline 702, the release agent which is in the release agent pipeline 702 enters the forming cavity 5 through the injection molding pipeline A6 and fills the forming cavity 5, the contact switch A717 is separated from the external bias abutting plate 4022 and enters the inside of the passing groove 4021, the electromagnet block A709 is powered off to drive the pushing piston 704 to reset, the sealing ring plate 707 is abutted against the inner bias sealing plate 708, and as the injection molding pipeline A6 is plugged away from the inner part of one end of the molding cavity 5, the reset pushing piston 704 can generate suction force inside the release agent pipeline 702 and suck the release agent inside the molding cavity 5 into the sealing box 701, so that the release agent is adhered to the inner wall of the molding cavity 5, meanwhile, the release agent inside the material supplementing box 703 enters the sealing box 701 through the material supplementing pipe 705 to supplement the material, thus the addition of the release agent inside the molding cavity 5 can be completed, in the process of long-touch switch B718, the electromagnet block B714 is electrified to enable the sealing ring plate 707 to enter the inner part of the sealing sliding groove 713 and compress the release spring group B716, so that the sealing ring plate 707 is not abutted against the inner bias sealing plate 708 any more, the abutting groove 4023 which is arranged inside the injection molding pipeline A6 and is followed by the injection molding pipeline B402 abuts against the inward-offset sealing plate 708 to enable the inward-offset sealing plate to seal the release agent pipeline 702;

After the injection molding pipeline B402 completely enters the injection molding pipeline A6, and the pushing motor 407 rotates to enable the pushing screw 408 to rotate to push the melt into the front end of the heating charging barrel 401 and the front end of the injection molding nozzle 409, the injection molding nozzle 409 and the pushing screw 408 advance in the heating charging barrel 401 to perform high-pressure and high-speed injection molding by extending the injection molding hydraulic rod 406, the melt enters the molding cavity 5 through the injection molding pipeline A6, the injection molding hydraulic rod 406 stops extending after injection molding to enable the injection molding nozzle 409 and the pushing screw 408 to stop positioning and pressure maintaining, and meanwhile, the melt in the molding cavity 5 is continuously cooled by the continuously inlet water in the cooling pipeline group 13 to assist in molding of a part;

After the workpiece in the molding cavity 5 is cooled and molded, the sliding base 404 drives the injection molding pipeline B402 to be separated from the injection molding pipeline A6 by shortening the advance and retreat hydraulic rod 403, the injection molding nozzle 409 and the injection molding screw 408 are rotated and retreated to carry out retreating feeding by starting the pushing motor 407 and shortening the injection molding hydraulic rod 406, and then the die hydraulic rod 12 is shortened to enable the movable die 3 and the fixed die 2 to be opened, and the injection molding work of the next workpiece can be carried out by carrying out the follow-up demolding;

before the plastic forming device is used for injection molding, a release agent can be independently added into the forming cavity 5 to reduce the release resistance, and the damage to a workpiece caused by subsequent release is avoided.

Example two

As shown in fig. 1 and fig. 9 to fig. 12, based on the first embodiment, two mold locking mechanisms 8 for locking the movable mold 3 are symmetrically arranged outside the apparatus base 1, and the mold locking mechanisms 8 comprise locking blocks 801 which are symmetrically and slidably connected above the apparatus base 1, wherein the locking blocks 801 can be locked outside the movable mold 3 in a mold closing state, so that the mold hydraulic rod 12 is prevented from independently maintaining a closing force applied to the movable mold 3;

The mold locking mechanism 8 further comprises a fixing frame A802 fixedly connected to the top of the device base 1 and a damping rod 803 which is rotationally arranged on the top of the device base 1 in a damping manner, an engagement toothed bar A804 fixedly connected with the locking block 801 is symmetrically and slidingly connected to the outer portion of the fixing frame A802, an engagement gear A805 engaged with the engagement toothed bar A804 is symmetrically and fixedly connected to the outer portion of the damping rod 803, an engagement gear B806 is fixedly connected to the middle portion of the damping rod 803, an engagement toothed bar B807 is arranged on the outer portion of the engagement gear B806, the engagement toothed bar B807 is fixedly connected with the heating cylinder 401 and the sliding base 404 through a connecting frame A808, and when the sliding base 404 drives the injection molding pipeline B402 to be inserted into the injection molding pipeline A6 through extending and advancing and retreating hydraulic rods 403, the connecting frame A808 can drive the engagement toothed bar B807 to move, so that the locking block 801 is slidingly locked on the outer side of the movable mold 3 in a mold closing state.

In the embodiment, when the sliding base 404 drives the injection molding pipeline B402 to be inserted into the injection molding pipeline A6 through extending the advancing and retreating hydraulic rod 403, the symmetrical connecting frame A808 which moves along with the heating cylinder 401 and the sliding base 404 can drive the meshing toothed bar B807 to move, so that the symmetrical two meshing gears B806 rotate and the symmetrical two meshing gears A805 are driven to rotate through the symmetrical damping rod 803, thereby the symmetrical two meshing toothed bars A804 slide outside the fixed frame A802 and drive the symmetrical two locking blocks 801 to slide and lock on the outer side of the movable die 3 in a die clamping state, and the hydraulic rod 12 of the die is prevented from independently resisting Zhang Moli in the subsequent injection molding and pressure maintaining stages and maintaining the closing force applied to the movable die 3;

Before injection molding, the plastic molding device can drive the symmetrical two locking blocks 801 to slide and lock the outer side of the movable mold 3 in a mold closing state, so that the mold hydraulic rod 12 can be prevented from independently resisting Zhang Moli in the subsequent injection molding and pressure maintaining stages and maintaining the closing force applied to the movable mold 3, namely, the phenomenon that burrs are generated on products due to the expansion of the mold in the mold closing state can be avoided.

Example III

As shown in fig. 1 and fig. 13-14, based on the first embodiment and the second embodiment, a fixed mold ejector rod group 9 and a movable mold ejector rod group 10 are respectively arranged in the fixed mold 2 and the movable mold 3, and the fixed mold ejector rod group 9 and the movable mold ejector rod group 10 can move towards the directions approaching to each other to realize ejection and demolding;

The outside of cover half ejector pin group 9 and movable mould ejector pin group 10 all is provided with connecting piece 11, connecting piece 11 includes fixed frame B111 of fixed connection outside cover half 2 or movable mould 3, fixed connection is at the outside spacing 112 of cover half ejector pin group 9 or movable mould ejector pin group 10 and fixed connection is at the butt frame 113 of cover half ejector pin group 9 or movable mould ejector pin group 10 tip, when spacing 112 contacts with fixed frame B111, can avoid moulding plastics tension in the injection molding process to lead to cover half ejector pin group 9 or movable mould ejector pin group 10 to retreat and influence the shaping quality of goods, the outside butt frame 113 outside symmetry fixedly connected with of cover half 2 is by the link B114 of movable mould 3 push-pull, the outside butt frame 113 of movable mould 3 receives device base 1 inboard extrusion, when making movable mould 3 and cover half 2 die opening through shortening mould hydraulic stem 12, movable mould 3 can make cover half ejector pin group 9 and movable mould ejector pin group 10 be close to each other through connecting piece 11 and carry out ejecting.

In the embodiment, when the movable die 3 and the fixed die 2 are opened by shortening the die hydraulic rod 12, the movable die 3 drives the external connecting piece 11 to be far away from the fixed die 2 and to be abutted against the connecting frame B114 outside the fixed die 2, so that the connecting frame B114 drives the fixed die ejector rod group 9 to extend out of the fixed die 2 through the abutting frame 113, and when the movable die 3 drives the external abutting frame 113 to extrude with the inner side of the device base 1, the external abutting frame 113 drives the movable die ejector rod group 10 to extend out of the movable die 3, namely, in the die opening process, the fixed die ejector rod group 9 can extend out of the fixed die 2 and then the movable die ejector rod group 10 can extend out of the movable die 3 for demolding;

When the plastic forming device is used for die opening, a workpiece attached to the inside of the fixed die 2 can be ejected and demoulded through the stretched fixed die ejector rod group 9, the movable die ejector rod group 10 is empty, the workpiece attached to the inside of the movable die 3 can be ejected and demoulded through the stretched movable die ejector rod group 10, the fixed die ejector rod group 9 is empty, namely, automatic demoulding can be carried out in the die opening process, and the appearance of the workpiece can be prevented from being influenced by the double-sided ejector die in the demoulding process.

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

Claims

1. A plastic molding device comprises a device base (1), a fixed die (2) arranged at the top of the device base (1), a movable die (3) and an injection molding mechanism (4), and is characterized in that a mold cavity (5) is formed by clamping the fixed die (2) and the movable die (3), an injection molding pipeline A (6) is arranged at one side of the fixed die (2) far away from the movable die (3), an adding mechanism (7) for adding a release agent into the molding cavity (5) through the injection molding pipeline A (6) is arranged in the fixed die (2), the adding mechanism (7) comprises a sealing material box (701) embedded in the fixed die (2), a release agent pipeline (702) fixedly communicated with the bottom of the sealing material box (701) and a material supplementing material box (703) fixedly connected with the top of the fixed die (2), a material pushing piston (703) is arranged in the sealing material box (701), a material supplementing material pipe (705) is fixedly communicated between the sealing material box (701) and the material supplementing material box (703), the sealing material box (704) is communicated with a sealing plate (706) and a sealing plate (706) in a sealing groove (707), the injection molding mechanism (4) comprises an injection molding pipeline B (402) fixedly communicated with the outside of the heating charging barrel (401), and the injection molding pipeline B (402) can be tightly inserted into the injection molding pipeline A (6);

Two mold locking mechanisms (8) for locking the movable mold (3) are symmetrically arranged outside the device base (1), and the mold locking mechanisms (8) comprise locking blocks (801) which are symmetrically and slidingly connected above the device base (1);

The inside of the fixed die (2) and the inside of the movable die (3) are respectively provided with a fixed die ejector rod group (9) and a movable die ejector rod group (10), and the outside of the fixed die ejector rod group (9) and the outside of the movable die ejector rod group (10) are respectively provided with a connecting piece (11);

The outside of the movable die (3) is provided with a die hydraulic rod (12), and the inside of the fixed die (2) and the inside of the movable die (3) are provided with a cooling pipeline group (13);

The injection molding mechanism (4) further comprises a driving and reversing hydraulic rod (403) mounted on the inner side of the device base (1) and a sliding base (404) connected to the top of the device base (1) in a sliding mode, the output end of the driving and reversing hydraulic rod (403) is fixedly connected with the sliding base (404), the heating charging barrel (401) is fixedly connected to the top of the sliding base (404), a hopper (405) is arranged on the top of the heating charging barrel (401), an injection molding hydraulic rod (406) is mounted on the inner side of the sliding base (404), a pushing motor (407) is fixedly connected to the output end of the injection molding hydraulic rod (406), a pushing screw (408) is fixedly connected to the output shaft of the pushing motor (407), and an injection molding nozzle (409) is arranged at the end of the pushing screw (408);

The inner side of the sealing material box (701) and the outer side of the pushing piston (704) are respectively provided with an electromagnet block A (709) and an iron connecting block A (710) which are opposite in position, the bottom of the butt joint groove (706) is communicated with a sealing sliding groove (713), the sealing ring plate (707) is in sliding connection with the inside of the sealing sliding groove (713), and the inside of the sealing sliding groove (713) and the bottom of the sealing ring plate (707) are respectively provided with an electromagnet block B (714) and an iron connecting block B (715) which are opposite in position;

the inside of the injection molding pipeline A (6) is provided with a touch switch A (717) connected with an electromagnet block A (709) power-on circuit and a touch switch B (718) connected with an electromagnet block B (714) power-on circuit, the outside of the injection molding pipeline B (402) is provided with a through groove (4021), the inside of the through groove (4021) is provided with an outer offset abutting plate (4022), and the outside of the injection molding pipeline B (402) is also provided with an abutting groove (4023).

2. The plastic molding device according to claim 1, wherein the electromagnet block A (709) is electrified to adsorb the iron connecting block A (710), a reset spring group A (711) is fixedly connected between the pushing piston (704) and the sealing material box (701), and a one-way valve (712) is arranged outside the material supplementing pipe (705);

And a reset spring group B (716) is fixedly connected between the sealing ring plate (707) and the sealing chute (713).

3. The plastic molding device according to claim 1, wherein the mold locking mechanism (8) further comprises a fixing frame A (802) fixedly connected to the top of the device base (1) and a damping rod (803) capable of damping rotation on the top of the device base (1), an engaging toothed bar A (804) fixedly connected with the locking block (801) is symmetrically and slidingly connected to the outer portion of the fixing frame A (802), an engaging gear A (805) engaged with the engaging toothed bar A (804) is symmetrically and fixedly connected to the outer portion of the damping rod (803), an engaging gear B (806) is fixedly connected to the middle portion of the damping rod (803), an engaging toothed bar B (807) is arranged on the outer portion of the engaging gear B (806), and the engaging toothed bar B (807) is fixedly connected with the heating cylinder (401) and the sliding base (404) through a connecting frame A (808).

4. A plastic molding device according to claim 3, wherein the connecting piece (11) comprises a fixed frame B (111) fixedly connected to the outside of the fixed mold (2) or the movable mold (3), a limiting frame (112) fixedly connected to the outside of the fixed mold ejector rod group (9) or the movable mold ejector rod group (10) and an abutting frame (113) fixedly connected to the end part of the fixed mold ejector rod group (9) or the movable mold ejector rod group (10), the outer part of the abutting frame (113) of the fixed mold (2) is symmetrically and fixedly connected with a connecting frame B (114) pushed and pulled by the movable mold (3), and the abutting frame (113) of the outer part of the movable mold (3) is extruded by the inner side of the device base (1).

5. A plastic molding method using a plastic molding apparatus as defined in claim 4, comprising the steps of:

Step one: firstly, a die hydraulic rod (12) is extended to enable a movable die (3) and a fixed die (2) to be clamped to form a forming cavity (5), then a driving and reversing hydraulic rod (403) is extended to enable an injection molding pipeline B (402) and an injection molding pipeline A (6) to be inserted into each other, a connecting frame A (808) is firstly enabled to drive a locking block (801) to be locked on the outer side of the movable die (3) in a clamping state in a sliding mode, then, the injection molding pipeline B (402) is enabled to short touch the touch switch A (717) and long touch the touch switch B (718), the touch switch A (717) short touch the inner wall of the molding cavity (5) to adhere with the release agent, and the touch switch B (718) long touch the seal ring plate (707) to be retracted into the seal chute (713);

Starting a pushing motor (407) after an injection molding pipeline B (402) completely enters an injection molding pipeline A (6), enabling a pushing screw (408) to rotate so as to push melt into the front end of a heating feed cylinder (401) and the front end of an injection molding nozzle (409), enabling the injection molding nozzle (409) and the pushing screw (408) to advance for injection molding in the heating feed cylinder (401) through extending an injection molding hydraulic rod (406), enabling the melt to enter the inside of a molding cavity (5) through the injection molding pipeline A (6), enabling water to continuously enter the inside of a cooling pipeline group (13) in the injection molding process to cool the melt in the molding cavity (5) to assist in molding of a part, and stopping extending the injection molding hydraulic rod (406) after injection molding so as to stop positioning and pressure maintaining of the injection molding nozzle (409) and the pushing screw (408);

step three, after a workpiece in the cavity (5) to be formed is cooled and formed, shortening a feeding and discharging hydraulic rod (403) to enable an injection molding pipeline B (402) to be separated from the inside of an injection molding pipeline A (6), and then enabling an injection molding nozzle (409) and a pushing screw (408) to rotate and retract to perform retreating feeding by starting a pushing motor (407) and shortening an injection molding hydraulic rod (406);

And fourthly, after the injection molding mechanism (4) is reset, shortening the mold hydraulic rod (12) to enable the movable mold (3) and the fixed mold (2) to be opened, enabling the fixed mold ejector rod group (9) to extend out of the fixed mold (2) for ejection demolding, enabling the movable mold ejector rod group (10) to extend out of the movable mold (3) for ejection demolding, and thus completing injection molding of a finished product.