CN206748987U - A kind of negative pressure chemical blowing injection molding system - Google Patents
A kind of negative pressure chemical blowing injection molding system Download PDFInfo
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- CN206748987U CN206748987U CN201720506626.9U CN201720506626U CN206748987U CN 206748987 U CN206748987 U CN 206748987U CN 201720506626 U CN201720506626 U CN 201720506626U CN 206748987 U CN206748987 U CN 206748987U
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- negative pressure
- pipeline
- mold cavity
- monitoring unit
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 35
- 238000007664 blowing Methods 0.000 title claims abstract description 26
- 239000000126 substance Substances 0.000 title claims abstract description 26
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 238000012544 monitoring process Methods 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000000465 moulding Methods 0.000 abstract description 8
- 238000004891 communication Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 23
- 230000009471 action Effects 0.000 description 15
- 230000001276 controlling effect Effects 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 230000006641 stabilisation Effects 0.000 description 5
- 238000011105 stabilization Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 206010000269 abscess Diseases 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000520 microinjection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010107 reaction injection moulding Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The utility model discloses a kind of negative pressure chemical blowing injection molding system, including injection machine, sealed mold of the injection machine equipment with air flue, mold cavity is connected through mould air flue and two exterior lines with vacuum tank, one external pipe is provided with the negative pressure valve of large scale valve core diameter, and another external pipe is provided with the controlling valve of small size valve core diameter；Mold cavity is connected through mould air flue and an exterior line with ambient atmosphere, and pipeline is provided with air valve；Vacuum tank is connected through pipeline with vavuum pump, and mold cavity air flue is respectively mounted gas pressure sensor with vacuum tank position；The negative pressure valve, controlling valve, air valve, vavuum pump and gas pressure sensor are connected with controlling with monitoring unit, control and monitoring unit and machine Control system unit communications；The utility model on the premise of chemical blowing moulding expansion ratio is improved, can eliminate the surface gas trace defect of plastic, realize the green production of chemical blowing injection appearance product.
Description
Technical field
It the utility model is related to a kind of foam injection molding system, more particularly to a kind of negative pressure chemical blowing injection molding system
System.
Background technology
With the diversified development of injecting products and the increasingly increase of market demand, people carry to the quality of injecting products
Requirements at the higher level are gone out.Product size precision is improved, mitigate product quality, shortening molding cycle and saves the mesh such as the energy in order to reach
, some new injection molding forming methods, such as foam injection molding method, multi component injection molding forming method, reaction injection molding side
The quilts such as method, exhaust injection molding forming method, gas assistant injection molding method, Vibration Injection Molding forming method, micro injection molding method
It is proposed and realize that market is applied.
The defects of plastic of conventional injection moulding process shaping is commonly present surface shrinkage, buckling deformation, poor dimensional precision.Experiment is ground
Study carefully and correlation theory research shows, chemical blowing Shooting Technique can effectively solve poor dimensional precision existing for conventional moulding, production
The defects of product warpage, pit and shrink mark.However, chemical blowing injection product surface has substantial amounts of gas trace defect, greatly drop
The low surface quality of product.Therefore, chemical blowing injecting products can not directly use as appearance member, need to be through polishing, spraying
Etc. can meet appearance member requirement after secondary operation, this is by the pollution for causing environment and the waste of resource.
Abscess hair of the gas trace defect of chemical blowing injection product surface mainly due to melt flows forward position in forming process
Raw rupture, gas can not escape the formation of mold cavity surface.To solve chemical blowing injection product surface quality problems, people
Proposing gas back pressure chemical blowing injection molding method, rapid thermal cycles injection molding method and mold cavity surface covers thermal insulation in succession
Film method of forming etc., although the above method can eliminate the surface defect of chemical blowing moulding, the foam structure of interiors of products
Still have much room for improvement.
The content of the invention
The principle formed based on chemical blowing moulding surface gas trace defect, the utility model proposes a kind of negative pressure chemistry to send out
Injection molding system is steeped, i.e., is taken out gas caused by the cell collapse of melt flows forward position in time using mold cavity gas negative pressure method
Walk, so as to eliminate the surface gas trace defect of chemical blowing moulding.Its specific forming process is：Injection machine and outside vacuum cavitations
Device talk, injection machine sends passage communications signals, the control of vacuum cavitations equipment to vacuum cavitations equipment at the end of matched moulds process
Negative pressure valve is opened, and mold cavity is connected with negative-pressure pipeline, mold cavity is vacuumized；When the gas in mold cavity
After pressure reaches the negative pressure value of setting, melt injection process is carried out；In the process, when controlling suction function by timer
Between, when the suction function time reaching the time of setting, vacuum cavitations equipment control negative pressure valve is closed, and opens atmos-valve
Door, mold cavity gas pressure is set to recover atmospheric pressure.
To achieve the above object, the utility model uses following technical proposals：
A kind of negative pressure chemical blowing injection molding system, mainly including injection machine, sealed mold, valve pipeline converting means
Put, vacuum tank, vavuum pump, control and monitoring unit.
The die joint of the sealed mold and inside are equipped with air flue, and air flue is connected by pipeline and valve pipeline conversion equipment
Connect, mold cavity outer flue is provided with gas pressure sensor and gas gauge.
The valve pipeline conversion equipment mainly has negative pressure valve, controlling valve and air valve, negative pressure valve and voltage stabilizing
Valve is installed on two parallel pipelines that mould connects with vacuum tank, and air valve is installed on the pipeline that mould is connected with air
On.
The vacuum tank is provided with gas pressure sensor and gas gauge, is changed respectively with valve pipeline by pipeline
Device connects with vavuum pump.
The control requires with monitoring unit according to actual production, controls the action of each valve, vavuum pump and warning device,
And carry out real-time communication with injection machine.Its data processing and control system can be industrial computer, computer, single-chip microcomputer or PLC.
A kind of negative pressure chemical blowing injection molding system, step are as follows：
1）Before beginning, the negative pressure value of vacuum tank is set, vavuum pump is run, after the pressure of vacuum tank reaches setting value, opens
Begin to carry out injection moulding process；
2）The matched moulds signal for receiving machine Control system unit with monitoring unit by controlling realizes system trigger, when matched moulds knot
Shu Shi, control start to receive the signal of gas pressure sensor with monitoring unit, passed by the die cavity negative pressure value and pressure of setting
Sensor signal carries out the dynamic regulation of negative pressure valve, and mold cavity is vacuumized；
3）When the gas pressure in mold cavity reaches the negative pressure value of setting, stop vacuumizing mold cavity gas
Action, control send permission injection signal with monitoring unit, it is allowed to which injection machine carries out next step action, and carries out timing, works as meter
When time when reaching setting value, control provides signal control air valve event with monitoring unit, and mold cavity and air are connect
It is logical；
4）When injection moulding process is completed, control and monitoring unit by receiving the die sinking signal of machine Control system unit,
The initialization of system control parameters is carried out, is prepared for next production cycle；
5）For the chemical blowing injection molding process for needing to vacuumize mold cavity before injection, in injection process
In, with the continuous filling of plastic melt, mold cavity space is gradually reduced, and increases type cavity gas pressure, in order to ensure to fill out
The stabilization of mold cavity gas pressure during filling, a permissible pressure value can be set, i.e., when mold cavity gas pressure is higher than
When setting value adds permissible pressure value, control provides voltage regulation signal control controlling valve action with monitoring unit, and mold cavity is entered
Row secondary vacuum pumping acts；When mold cavity gas pressure, which drops to setting value, subtracts permissible pressure value, controlling valve power-off is closed,
Stopping vacuumizes to mold cavity, realizes the stability contorting of mold cavity gas pressure.
The utility model, by the signal communication with injection machine, controls corresponding valve to carry out according to actual injection moulding process
Action, complete to the vacuumizing of molding mold cavity, voltage stabilizing and press functional requirement again, and can realize to mold cavity negative pressure value and
The control of suction function time, it is ensured that the quality and yield rate of injecting products, and be advantageous to improve in actual production and be molded work
The efficiency of skill parameter testing.The utility model can ensure that mold cavity pressure limit is that 0~﹣ 0.08MPa can in injection moulding process
Adjust（Actual use pressure limit is 0~﹣ 0.06MPa）, the stabilization of the mold cavity gas pressure in injection moulding process can be ensured
Maintain；When mold cavity gas pressure reaches setting low pressure and allows to mold pressure, control carries out signal with monitoring unit
Feedback, it is allowed to which injection machine carries out next step action.
For the new injection molding process requirement for needing progress mold cavity gas to vacuumize at present, mold cavity gas
The vacuum that pressure need to carry out certain time when reaching the vacuum pressure of setting is maintained, therefore bypass small size pipeline can be used to enter
Row secondary vacuum pumping, so as to realize the stabilization of mold cavity vacuum pressure.
The utility model is needed first to be vacuumized vacuum tank before shaping, made in tank according to the detailed process of injection molding
Negative pressure value is less than the setting value of mold cavity gas pressure, and vacuum tank and mould are monitored using gas pressure sensor and pressure gauge
Gas pressure in die cavity.The matched moulds signal for reading machine Control system unit with monitoring unit by controlling carries out system trigger,
At the end of matched moulds, what the control valve related to monitoring unit control drove progress mold cavity vacuumizes action, starts pair
Mold cavity is vacuumized, and monitors mold cavity internal gas pressure in real time by pressure sensor, when mold cavity gas
Stop vacuumizing die cavity when body pressure reaches setting value, and provide injection signal, it is allowed to which injection machine carries out next step action.
Melt starts timing when injecting, when the suction function time reaching setting value, control and monitoring unit control related valve action,
Mold cavity is set to be connected with air.After the completion of an injection cycle, control utilizes machine Control system unit with monitoring unit
Signal is molded, carries out the Initialize installation of parameter, is prepared for next production cycle.In chemical blowing injection moulding process, melt
When filling mold cavity, mold cavity gas pressure can gradually increase, and can now pass through the side of small size pipeline bypass circulation
Method carries out vacuum maintenance, so as to realize the stability contorting of mold cavity gas pressure.
Control described in the utility model receives injection machine signal and pressure sensor signal with monitoring unit, by data
5V voltage signals and make-and-break signal are exported after processing；By the matched moulds signal activation vacuum control system of injection machine, start to mould
Tool die cavity carries out vacuumizing action；By pressure sensor signal and setup pressure value dynamic regulation negative pressure valve, mould is realized
The dynamic regulation of type cavity gas pressure；By setting the action of mold cavity suction function time control air valve, note is realized
The mold cavity suction function time is controllable during modeling；Vacuum cavitations system is realized using the die sinking signal of machine Control system unit
The Initialize installation of system, to carry out next injection cycle.
The beneficial effects of the utility model are can effectively to eliminate the abscess in melt flows forward position in chemical blowing injection moulding process
Rupture causes the gas trace defect that product surface occurs.Using the negative pressure chemical blowing injection moulding process of proposition, the matter that foams can improved
While amount, the chemical blowing injecting products of excellent surface quality are obtained, so as to eliminate the works such as follow-up polishing, polishing, spraying
Sequence, while green production is realized, reduce resource and artificial waste.
Brief description of the drawings
Fig. 1 is the utility model negative pressure chemical blowing injection molding system structure chart.
Wherein 1. injection machines, 2. sealed molds, 3. controls and monitoring unit, 4. valve pipeline conversion equipments, 5. vacuum tanks,
6. vavuum pump, 7. warning devices.
Embodiment
The utility model is further illustrated with reference to the accompanying drawings and examples.
As shown in figure 1, negative pressure chemical blowing injection molding system, including injection machine 1, injection machine 1 are equipped with sealed mold 2,
The die joint of sealed mold 2 and inside process air flue, and valve pipeline conversion equipment 4 includes negative pressure line, voltage stabilizing pipeline and air
Pipeline, each pipeline are separately installed with negative pressure valve, controlling valve and air valve, and the air flue of mould 2 turns through valve pipeline respectively
Negative pressure line and voltage stabilizing pipeline in changing device 4 are connected with vacuum tank 5, and the air flue of mould 2 is through in valve pipeline conversion equipment 4
Air pipeline be connected with ambient atmosphere, vacuum tank 5 is connected with vavuum pump 6, valve in the valve pipeline conversion equipment 4 and
Sensor, vavuum pump 6, warning device 7 are connected with controlling with monitoring unit 3, control and the control of monitoring unit 3 and injection machine 1
Unit communications processed.
Mold cavity is connected with vacuum tank 5 respectively through two-way negative pressure line in parallel and voltage stabilizing pipeline, and two pipelines are pacified respectively
Equipped with big flow negative pressure valve and low discharge controlling valve.Big flow negative pressure valve is used to take out mold cavity at the end of matched moulds
Vacuum acts, and low discharge controlling valve is used to maintain the stable of mold cavity gas pressure when melt is injected.All pneumatic ducts
Road uses stainless steel tube.Control and the data processing module of monitoring unit 3 can be industrial computer, computer, single-chip microcomputer or PLC.
Control section in control and monitoring unit 3 can realize the signal communication between machine Control system unit, receive biography
Sensor signal, injection moulding machine mould open signal, injection machine matched moulds signal, and the signal output after data processing is realized, control respective valve
Door driving carries out corresponding actions.
The pressure limit of described vacuum tank 5：0~﹣ 0.08MPa.
The volume of described vacuum tank 5：500~800L.
The described volume of sealed mold 2：1~2L.
Negative pressure valve diameter in described valve pipeline 4：Φ8mm.
Controlling valve diameter in described valve pipeline 4：Φ4mm.
Air diameter valve in described valve pipeline 4：Φ8mm.
Described air flue pipeline uses stainless steel tube, and caliber size is Φ 8mm.
For negative pressure chemical blowing injection molding process, mold cavity gas pressure range is generally 0~﹣ 0.06Mpa, existing
Using mold cavity negative pressure value in injection moulding process as ﹣ 0.05MPa, the suction function time be 2.5s exemplified by illustrate the forming method.
1）Before beginning, the negative pressure value of vacuum tank 5 is set, setting value is less than ﹣ 0.05MPa, is controlled by controlling with monitoring unit 3
Vavuum pump 6 processed is acted, and vacuum tank 5 is vacuumized, and when the negative pressure value in vacuum tank 5 reaches setting value, is stopped to vacuum
Tank 5 vacuumizes action.
2）Controlling with setting mold cavity negative pressure value as ﹣ 0.05MPa in monitoring unit 3, when concurrently setting suction function
Between be 2.5s.
3）The matched moulds signal of control unit in injection machine 1, at the end of matched moulds, control are received with monitoring unit 3 by controlling
System starts to receive the signal for the pressure sensor installed on sealed mold 2 with monitoring unit 3, passes through the mold cavity negative pressure of setting
Value and pressure sensor signal, to the negative pressure valve dynamic control in valve pipeline conversion equipment 4, so as to realize to mold cavity
Vacuumize.
4）When the type cavity gas pressure of sealed mold 2 reaches the negative pressure value of setting, control sends letter with monitoring unit 3
Number, the negative pressure valve closed in valve pipeline conversion equipment 4, and control unit sends permission injection signal into injection machine 1, together
The timing of Shi Jinhang suction function times.
5）After control unit receives permission injection signal in injection machine 1, melt injection process is carried out, in filling melt mould
During having die cavity, the gas in die cavity is compressed, and is caused the mold cavity gas pressure of sealed mold 2 to raise, is now controlled
Will be according to actual conditions with monitoring unit 3, the low discharge controlling valve action in control valve pipeline conversion equipment 4, to mould
Die cavity carries out secondary vacuum pumping action, it is ensured that the stabilization of mold cavity gas pressure in whole injection process.
6）When the suction function time reaching 2.5s, control sends signal, control valve pipeline converting means with monitoring unit 3
The air valve event in 4 is put, the mold cavity of sealed mold 2 is connected with air, and control unit is sent into injection machine 1
Allow to mold signal.
7）When an injection moulding process is completed, when carrying out die sinking pickup, control is with monitoring unit 3 by receiving in injection machine 1
The die sinking signal that control unit is sent, the Initialize installation of system is carried out, prepared for next production cycle.
8）In whole forming process, control monitors the negative pressure value in vacuum tank 5 with monitoring unit 3 in real time, and controls true
The action of empty pump 6, it is ensured that the negative pressure value stabilization of vacuum tank 5.
9）In whole formation system, warning device 7 is provided with, when the appearance of abnormal pressure or sealed mold 2 of vacuum tank 5
Type cavity gas hypotony/too high when, control sends alarm signal with monitoring unit 3, and control warning device 7 is acted, led to
Know that staff is overhauled.
It is not new to this practicality although above-mentioned specific embodiment of the present utility model is described with reference to accompanying drawing
The protection domain of type is limited, and one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model
On, those skilled in the art need not pay the various modifications that creative work can make or deformation still of the present utility model
Within protection domain.
Claims (5)
1. a kind of negative pressure chemical blowing injection molding system, it is characterized in that, including injection machine, injection machine, which is equipped with, has the close of air flue
Mould is sealed, gas pressure sensor is installed on mould air flue, mold cavity is connected with external valve pipeline conversion equipment, the valve
Door pipeline conversion equipment has negative pressure line, voltage stabilizing pipeline and air pipeline, and each pipeline is separately installed with negative pressure valve, pressure maintaining valve
Door and air valve, the negative pressure line and voltage stabilizing pipeline of valve pipeline conversion equipment are connected with vacuum tank, and vacuum tank is provided with gas
Pressure sensor and pressure gauge, vacuum tank are connected by pipeline with vavuum pump；The negative pressure valve, controlling valve, atmos-valve
Door, vavuum pump, gas pressure sensor are connected with controlling with monitoring unit, control and monitoring unit and machine Control system unit
It is connected.
2. the system as claimed in claim 1, it is characterized in that, the valve pipeline conversion equipment include two-way it is in parallel and vacuum
The connected vacuum-pumping pipeline of tank, negative pressure valve and controlling valve are respectively equipped with two-way vacuum-pumping pipeline in parallel.
3. system as claimed in claim 2, it is characterized in that, the valve element gas circuit diameter of the negative pressure valve is more than controlling valve
Valve element gas circuit diameter.
4. system as claimed in claim 2, it is characterized in that, the negative pressure valve and controlling valve with control and monitoring unit
Connection.
5. the system as claimed in claim 1, it is characterized in that, described control with monitoring unit is industrial computer, computer, single-chip microcomputer
Or PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720506626.9U CN206748987U (en) | 2017-05-09 | 2017-05-09 | A kind of negative pressure chemical blowing injection molding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720506626.9U CN206748987U (en) | 2017-05-09 | 2017-05-09 | A kind of negative pressure chemical blowing injection molding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206748987U true CN206748987U (en) | 2017-12-15 |
Family
ID=60617897
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720506626.9U Expired - Fee Related CN206748987U (en) | 2017-05-09 | 2017-05-09 | A kind of negative pressure chemical blowing injection molding system |
Country Status (1)
| Country | Link |
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| CN (1) | CN206748987U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108859044A (en) * | 2017-05-09 | 2018-11-23 | 临沂大学 | Negative pressure chemical blowing injection molding forming method |
| CN109366860A (en) * | 2018-11-02 | 2019-02-22 | 北京航玻新材料技术有限公司 | A kind of automation vacuum injection system |
| CN109878045A (en) * | 2019-01-31 | 2019-06-14 | 贵州省材料产业技术研究院 | Intelligence adjusts the control device that mold cavity pressure is constant and is precisely controlled |
| CN111186079A (en) * | 2018-11-14 | 2020-05-22 | 临沂大学 | Dynamic die cavity gas pressure auxiliary injection molding system |
-
2017
- 2017-05-09 CN CN201720506626.9U patent/CN206748987U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108859044A (en) * | 2017-05-09 | 2018-11-23 | 临沂大学 | Negative pressure chemical blowing injection molding forming method |
| CN109366860A (en) * | 2018-11-02 | 2019-02-22 | 北京航玻新材料技术有限公司 | A kind of automation vacuum injection system |
| CN111186079A (en) * | 2018-11-14 | 2020-05-22 | 临沂大学 | Dynamic die cavity gas pressure auxiliary injection molding system |
| CN109878045A (en) * | 2019-01-31 | 2019-06-14 | 贵州省材料产业技术研究院 | Intelligence adjusts the control device that mold cavity pressure is constant and is precisely controlled |
| CN109878045B (en) * | 2019-01-31 | 2020-12-29 | 贵州省材料产业技术研究院 | Control device for intelligently adjusting constant pressure and accurate control of mold cavity |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171215 |