CN113787669A

CN113787669A - Vacuum low-pressure injection molding system

Info

Publication number: CN113787669A
Application number: CN202111083014.0A
Authority: CN
Inventors: 莫郧强; 朱赵辉
Original assignee: Huizhou Dazhi Precision Plastic Co ltd
Current assignee: Huizhou Dazhi Precision Plastic Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2021-12-14

Abstract

The invention provides a vacuum low-pressure injection molding system which comprises a machine body, wherein a protective box and a material injection mechanism are arranged on the upper surface of the machine body, a movable mold body and a fixed mold body are arranged in the protective box, the movable mold body and the fixed mold body are arranged, a movable mold moving mechanism is arranged on the back of the movable mold body, a supporting frame is arranged on one side of the protective box, and a PLC injection molding controller, an independent vacuum low-pressure controller and a cooling mechanism control switch are arranged on the surface of the supporting frame. The vacuum negative pressure air extraction and injection molding system is independent, can be independently installed according to needs, is convenient to repair and maintain, is more convenient to repair and replace compared with a unified vacuum injection molding system controlled by a plc, and is convenient to operate by only carrying out timing control through a timing module and automatically starting a press switch during mold closing and injection molding to carry out a series of independent air extraction vacuum operations.

Description

Vacuum low-pressure injection molding system

Technical Field

The invention relates to the technical field of injection molding, in particular to a vacuum low-pressure injection molding system.

Background

In the injection molding process, molten plastic fluid is injected into a mold cavity through an injection nozzle of an injection molding machine, a large amount of air remained in the mold cannot be discharged in time during injection due to gas existing in the mold cavity, the gas pressure of the mold cavity at the moment of injection molding is extremely high, the filling effect of injection molding raw materials is poor, and the phenomena of flow marks and scorching of the molding mold can be caused due to the gas, so that the performance of a product is influenced, the rejection rate of the product is increased, the mold is vacuumized by using an air suction pump when being closed, the production effect of the product can be well improved, the existing vacuum low-pressure air suction and injection molding system is generally integrated, is a vacuum low-pressure injection molding system and is positioned in the same system, the injection mold generally vacuumizes the interior of the mold before injection molding through PLC control, but when a problem occurs in a later vacuum low-pressure system, need carry out holistic maintenance change or reprogram the system, it is comparatively inconvenient to overhaul, and the vacuum low pressure injection moulding system of integral type is comparatively expensive, is not convenient for install additional simultaneously on the device of moulding plastics to not having vacuum low pressure mechanism, probably needs to carry out the whole change to the system of moulding plastics.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a vacuum low-pressure injection molding system, which solves the problems that the existing vacuum low-pressure and injection molding are positioned in the same PLC control system, generally, an injection mold is vacuumized before upper injection molding through PLC control, but when the later vacuum low pressure is in a problem, the integral maintenance and replacement or the reprogramming of the system are needed, the maintenance is inconvenient, the integral vacuum low-pressure injection molding system is expensive, and the integral vacuum low-pressure injection molding system is inconvenient to install on an injection molding device without a vacuum low-pressure mechanism and possibly needs to be integrally replaced.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a vacuum low pressure injection moulding system, includes the organism, the upper surface of organism is provided with the protecting box and annotates material mechanism, the internally mounted of protecting box has movable mould body and cover half body, the back of movable mould body is provided with movable mould moving mechanism, protecting box one side is provided with the support frame, and the surface mounting of support frame has PLC injection controller, independent vacuum low pressure controller and cooling body control switch, the equal fixedly connected with welded plate of bisymmetry lateral wall of movable mould body and cover half body, be provided with first press switch subassembly and second press switch subassembly on the welded plate of movable mould body and cover half body both sides, first press switch subassembly and second press switch subassembly all include on-off mechanism and press mechanism, the surface of organism is provided with the switch door, the internally mounted of organism has vacuum pump, A cooling mechanism and a circulating water pump.

Preferably, on-off mechanism includes second mounting panel, mount pad, buffer spring and press the switch, the surface mounting of mount pad and second mounting panel, the mounting hole has been seted up on the surface of second mounting panel, buffer spring is located the inside of mount pad, buffer spring's one end is fixed with the inner wall of mount pad, and buffer spring's the other end is fixed with the fixed plate, the surface of fixed plate is fixed with press the switch, conveniently passes through the fix with screw with on-off mechanism on the welded plate, and when the movable mould body was close to the cover half body, can open the vacuum pump through on-off mechanism and carry out the evacuation, opens circulating water pump simultaneously and cools off the inside injection moulding product of mould, and the buffer spring of press the switch bottom plays the cushioning effect, avoids pressure too big to press the switch to produce the damage.

Preferably, the pressing mechanism comprises a first mounting plate, a pressing block and a rubber sleeve, the pressing block is fixed to the lower surface of the first mounting plate, the rubber sleeve is sleeved on the outer edge surface of the pressing block, and the centers of the pressing block and the pressing switch are located on the same horizontal line, so that the pressing block can be pressed on the pressing switch to be opened when the mold is closed.

Preferably, a timing module and a switch control module are arranged inside the independent vacuum low-pressure controller, the independent vacuum low-pressure controller is electrically connected with the vacuum pump and the first press switch assembly, the second press switch assembly is electrically connected with the circulating water pump, the press switch is pressed, the first press switch assembly can automatically open the vacuum pump for vacuumizing, the vacuumizing time is controlled by the timing module inside the independent vacuum low-pressure controller, the vacuumizing time is ensured before the material injection mechanism injects materials into the mold, meanwhile, the timing is carried out by the timing module, the air inlet time of the vacuum pump is ensured before 2-3 seconds of discharging the mold after injection molding, so that a complete vacuum low-pressure molding injection system is formed by matching with the PLC injection controller, and the second press switch assembly is pressed during mold closing to ensure that the circulating water pump is opened for water inlet for circulating cooling, after the injection molding and demolding are completed, the circulating water pump can be automatically turned off by separating the pressing block from the pressing switch.

Preferably, cover half body lateral wall and mould plastics and communicate between the groove and install the connecting valve that admits air and give vent to anger the connecting valve, admit air the connecting valve and give vent to anger the connecting valve and pass through pipeline and vacuum pump connection respectively, admit air the connecting valve and be the check valve with the connecting valve of giving vent to anger, carry out the vacuum when moulding plastics and bleed in order to improve off-the-shelf quality, get into the air through the connecting valve that admits air after the completion of moulding plastics, avoid influencing opening of movable mould body because of the internal and external pressure is inconsistent.

Preferably, cooling body includes coolant tank and installs a plurality of semiconductor refrigerator on coolant tank surface, and is a plurality of the cold junction of semiconductor refrigerator is installed and is led the cold drawing and extend to coolant tank's inside, and is a plurality of semiconductor refrigerator and cooling body control switch electric connection lead the material of cold drawing and be aluminum plate, and the heat absorptivity is good, extends to the inside heat of absorption that coolant tank's inside can be better, improves the cooling effect of the inside cooling water of coolant tank to improve the cooling rate to the product, improve cooling efficiency.

Preferably, the water pumping end of the circulating water pump is communicated with the cooling water tank, a cooling channel is arranged inside the movable mold body, and the water outlet end of the circulating water pump and the side wall of the cooling water tank far away from the circulating water pump are respectively connected with the two ends of the cooling channel through water pipes, so that cooled cooling liquid can be rapidly cooled from the inside of the cooling channel guided by the cooling water tank.

The working principle is as follows: during the use, close on when closing up and close up the pressing block and contact press switch through PLC injection controller control movable mould body, make the vacuum pump bleed and to the evacuation between cover half body and the movable mould body, circulating water pump opens simultaneously and draws water, later PLC injection controller control is annotated the material mechanism and is annotated the material to mould inside, and coolant water or coolant liquid of coolant tank are taken out by circulating water pump when annotating the material and play the cooling effect to the product through the inside pair of cooling channel of movable mould body, after the cooling, before the needs die sinking, the inside timing module of independent vacuum low pressure controller reachs and predetermines the time, the control vacuum pump is bled, inject the air into mould again inside, in order to make things convenient for the movable mould body to open, so as to get the material.

(III) advantageous effects

The invention provides a vacuum low-pressure injection molding system. The method has the following beneficial effects:

the vacuum negative pressure air exhaust and injection molding system is mutually independent, can be independently installed with a tool, is convenient to maintain, is more convenient to maintain and replace compared with a unified vacuum injection molding system controlled by plc, can perform a series of independent air exhaust vacuum operations only by performing timing control through a timing module and automatically starting a press switch during mold closing and injection molding, is independently driven at the same time, can be started for circulating cooling during mold closing and stopped during mold opening, is convenient to operate, is simple to maintain and replace, and improves the cooling and shaping efficiency of injection molding products through the arrangement of a cooling mechanism.

Drawings

FIG. 1 is an overall schematic view of the present invention;

FIG. 2 is a system diagram of the present invention;

FIG. 3 is a schematic view of the overall structure of the first and second push switch assemblies of the present invention;

fig. 4 is an overall schematic view of the cooling mechanism of the present invention.

Wherein, 1, the body; 2. a PLC injection molding controller; 3. a material injection mechanism; 4. a protective box; 5. a self-contained vacuum low pressure controller; 6. a movable mold body; 7. the fixed die body; 8. a cooling mechanism; 801. a semiconductor refrigerator; 802. a cooling water tank; 9. a water circulating pump; 10. welding the plate; 11. a first push switch assembly; 12. a second push switch assembly; 13. a cooling mechanism control switch; 14. a vacuum pump; 15. an intake connecting valve; 16. an air outlet connecting valve; 17. a first mounting plate; 18. a pressing block; 19. a rubber sleeve; 20. a mounting seat; 21. a second mounting plate; 22. a buffer spring; 23. a push switch; 24. and (7) fixing the plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

the embodiment of the invention provides a vacuum low-pressure injection molding system, which comprises a machine body 1, wherein a protective box 4 and a material injection mechanism 3 are arranged on the upper surface of the machine body 1, a movable mold body 6 and a fixed mold body 7 are arranged inside the protective box 4, the movable mold body 6 and the fixed mold body 7 are arranged, a movable mold moving mechanism is arranged on the back of the movable mold body 6, a supporting frame is arranged on one side of the protective box 4, a PLC (programmable logic controller) injection molding controller 2, an independent vacuum low-pressure controller 5 and a cooling mechanism control switch 13 are arranged on the surface of the supporting frame, welding plates 10 are fixedly connected on two symmetrical side walls of the movable mold body 6 and the fixed mold body 7, a first press switch assembly 11 and a second press switch assembly 12 are arranged on the welding plates 10 on two sides of the movable mold body 6 and the fixed mold body 7, each of the first press switch assembly 11 and the second press switch assembly 12 comprises a switch mechanism and a press mechanism, the surface of the machine body 1 is provided with a switch door, and the inside of the machine body 1 is provided with a vacuum pump 14, a cooling mechanism 8 and a circulating water pump 9.

The independent vacuum low-pressure controller 5 is internally provided with a timing module and a switch control module, the independent vacuum low-pressure controller 5 is electrically connected with a vacuum pump 14 and a first press switch assembly 11, and a second press switch assembly 12 is electrically connected with a circulating water pump 9.

An air inlet connecting valve 15 and an air outlet connecting valve 16 are arranged between the side wall of the fixed die body 7 and the injection molding groove in a communicated mode, the air inlet connecting valve 15 and the air outlet connecting valve 16 are connected with a vacuum pump 14 through pipelines respectively, the water pumping end of the circulating water pump 9 is communicated with the cooling water tank 801, a cooling channel is arranged inside the movable die body 6, and the water outlet end of the circulating water pump 9 and the side wall, far away from the circulating water pump 9, of the cooling water tank 801 are connected with the two ends of the cooling channel through water pipes respectively.

As shown in fig. 3, the switch mechanism includes a second mounting plate 21, a mounting seat 20, a buffer spring 22 and a push switch 23, the mounting seat 20 is fixed to the surface of the second mounting plate 21, a mounting hole is formed in the surface of the second mounting plate 21, the buffer spring 22 is located inside the mounting seat 20, one end of the buffer spring 22 is fixed to the inner wall of the mounting seat 20, the other end of the buffer spring 22 is fixed to a fixing plate 24, the surface of the fixing plate 24 is fixed to the push switch 23, the push mechanism includes a first mounting plate 17, a push block 18 and a rubber sleeve 19, the push block 18 is fixed to the lower surface of the first mounting plate 17, the rubber sleeve 19 is sleeved on the outer side of the push block 18, and the centers of the push block 18 and the push switch 23 are located on the same horizontal line, so that the push block abuts against the push switch to be started when the switch is pushed downward.

As shown in fig. 4, the cooling mechanism 8 includes a cooling water tank 801 and a plurality of semiconductor refrigerators 802 mounted on a surface of the cooling water tank 801, cold ends of the plurality of semiconductor refrigerators 802 are mounted with cold conductive plates and extend to an inside of the cooling water tank 801, and the plurality of semiconductor refrigerators 802 are electrically connected to the cooling mechanism control switch 13.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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. The utility model provides a vacuum low pressure injection moulding system, includes organism (1), its characterized in that: the upper surface of the machine body (1) is provided with a protective box (4) and an injection mechanism (3), the protective box (4) is internally provided with a movable mould body (6) and a fixed mould body (7), the movable mould body (6) and the fixed mould body (7) are arranged, the back of the movable mould body (6) is provided with a movable mould moving mechanism, one side of the protective box (4) is provided with a support frame, the surface of the support frame is provided with a PLC injection controller (2), an independent vacuum low-voltage controller (5) and a cooling mechanism control switch (13), two symmetrical side walls of the movable mould body (6) and the fixed mould body (7) are fixedly connected with a welding plate (10), the welding plates (10) at two sides of the movable mould body (6) and the fixed mould body (7) are provided with a first press switch component (11) and a second press switch component (12), the first press component (11) and the second press component (12) both comprise a switch mechanism and a press mechanism, the surface of the machine body (1) is provided with a switch door, and a vacuum pump (14), a cooling mechanism (8) and a circulating water pump (9) are arranged inside the machine body (1).

2. A vacuum low pressure injection molding system according to claim 1, wherein: switch mechanism includes second mounting panel (21), mount pad (20), buffer spring (22) and push switch (23), the fixed surface of mount pad (20) and second mounting panel (21), the mounting hole has been seted up on the surface of second mounting panel (21), buffer spring (22) are located the inside of mount pad (20), the one end of buffer spring (22) is fixed with the inner wall of mount pad (20), and the other end of buffer spring (22) is fixed with fixed plate (24), the surface of fixed plate (24) is fixed with push switch (23).

3. A vacuum low pressure injection molding system according to claim 1 or 2, wherein: the pressing mechanism comprises a first mounting plate (17), a pressing block (18) and a rubber sleeve (19), the pressing block (18) is fixed to the lower surface of the first mounting plate (17), the rubber sleeve (19) is sleeved on the outer side surface of the pressing block (18), and the centers of the pressing block (18) and the pressing switch (23) are located on the same horizontal line.

4. A vacuum low pressure injection molding system according to claim 1, wherein: the automatic control system is characterized in that a timing module and a switch control module are arranged inside the independent vacuum low-pressure controller (5), the independent vacuum low-pressure controller (5) is electrically connected with a vacuum pump (14) and a first press switch assembly (11), and a second press switch assembly (12) is electrically connected with a circulating water pump (9).

5. A vacuum low pressure injection molding system according to claim 1, wherein: the fixed die is characterized in that an air inlet connecting valve (15) and an air outlet connecting valve (16) are communicated and installed between the side wall of the fixed die body (7) and the injection molding groove, and the air inlet connecting valve (15) and the air outlet connecting valve (16) are respectively connected with a vacuum pump (14) through pipelines.

6. A vacuum low pressure injection molding system according to claim 1, wherein: the cooling mechanism (8) comprises a cooling water tank (801) and a plurality of semiconductor refrigerators (802) arranged on the surface of the cooling water tank (801), cold ends of the semiconductor refrigerators (802) are provided with cold guide plates and extend into the cooling water tank (801), and the semiconductor refrigerators (802) are electrically connected with a cooling mechanism control switch (13).

7. A vacuum low pressure injection molding system according to claim 1 or 6, wherein: the water pumping end of the circulating water pump (9) is communicated with the cooling water tank (801), a cooling channel is arranged inside the movable mold body (6), and the water outlet end of the circulating water pump (9) and the side wall, far away from the circulating water pump (9), of the cooling water tank (801) are respectively connected with the two ends of the cooling channel through water pipes.