CN105538624A - Mould clamping system for injection molding machine and oil way control method for mould clamping system for injection molding machine - Google Patents

Mould clamping system for injection molding machine and oil way control method for mould clamping system for injection molding machine Download PDF

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Publication number
CN105538624A
CN105538624A CN201610049949.XA CN201610049949A CN105538624A CN 105538624 A CN105538624 A CN 105538624A CN 201610049949 A CN201610049949 A CN 201610049949A CN 105538624 A CN105538624 A CN 105538624A
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CN
China
Prior art keywords
locking
oil
mode
unicom
oil circuit
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Application number
CN201610049949.XA
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Chinese (zh)
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CN105538624B (en
Inventor
郑海伟
林晖
吴俊�
俞继印
邬洪亮
周益辉
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Haitian Plastics Machinery Group
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Haitian Plastics Machinery Group
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Priority to CN201610049949.XA priority Critical patent/CN105538624B/en
Publication of CN105538624A publication Critical patent/CN105538624A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/64Mould opening, closing or clamping devices
    • B29C45/67Mould opening, closing or clamping devices hydraulic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/82Hydraulic or pneumatic circuits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/82Hydraulic or pneumatic circuits
    • B29C2045/826Plurality of hydraulic actuators driven by one hydraulic pump

Abstract

The invention provides a mould clamping system for an injection molding machine and belongs to the technical field of hydraulic transmission; the problem that an existing mould clamping system used for the injection molding machine has a poor mould clamping effect is solved by the mould clamping system for the injection molding machine provided by the invention. The mould clamping system for the injection molding machine comprises an oil tank, a first oil way, a second oil way, mould clamping oil cylinders and cutoff units, wherein the oil tank is used for storing oil; the first oil way communicates with the oil tank and is used for delivering the oil; the second oil way communicates with the oil tank and is used for delivering the oil; the number of the mould clamping oil cylinders is multiple, and each mould clamping oil cylinder communicates with the first oil way; the cutoff units and the mould clamping oil cylinders are in one-to-one correspondence; the cutoff units communicate with the second oil way and are used for driving the corresponding mould clamping oil cylinders to perform mould clamping. The mould clamping system disclosed by the invention has the advantages that a mould clamping force can be adjusted independently, and the mould clamping effect is good.

Description

A kind of injection moulding machine mode-locking system and oil circuit control method thereof
Technical field
The invention belongs to hydraulic transmission technology field, relate to a kind of injection moulding machine mode-locking system and oil circuit control method thereof.
Background technology
Injection machine is made up of injecting systems, Clamping System, Hydraulic Power Transmission System, electric control system, lubricating system, heating and cooling system, safety monitoring system etc. usually.Wherein, the effect of Clamping System is that guarantee mould closes, opens and ejecting product.Meanwhile, after the mold is closed, the clamp force that injection machine supply mould is enough, to resist the cavity pressure that molten plastic enters die cavity generation, avoids mould to crack and causes the underproof phenomenon of product to occur.
For ensureing the quality of injecting products, locking force of injection machine must be greater than cavity pressure, and the clamp force scope of same injection machine is certain, and cannot meet the mould of multiple different cavity pressure, utilization rate of equipment and installations is low, and when injection moulding is produced, cost is higher.
In addition, mostly adopt during existing injection moulding machine mode-locking and unified control each Mode-locking oil cylinder, locked mode rigidity is lower, keeps away unavoidably to allow mould phenomenon (namely mould cracks), and injecting products easily produces overlap, reduction product quality.
Particularly when carrying out locked mode to eccentric mould, the defect of unified each Mode-locking oil cylinder of control is just more obvious, cannot adjust clamp force pointedly, thus the scrappage causing product higher.
In sum, for solving the deficiency of the existing clamping system for injection machine, need to design a kind of reasonable in design, clamp force can be regulated separately and the effective injection moulding machine mode-locking system of locked mode.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, propose a kind of reasonable in design, clamp force can be regulated separately and the effective injection moulding machine mode-locking system of locked mode.
Object of the present invention realizes by following technical proposal: a kind of injection moulding machine mode-locking system, comprising:
Fuel tank, for storing fluid;
First oil circuit, with fuel tank UNICOM and for delivering oil;
Second oil circuit, with fuel tank UNICOM and for delivering oil;
Mode-locking oil cylinder, be set to multiple and each Mode-locking oil cylinder all with the first oil circuit UNICOM;
Cutting unit, with Mode-locking oil cylinder one_to_one corresponding, described cutting unit is with the second oil circuit UNICOM and for driving corresponding Mode-locking oil cylinder to carry out locked mode.
In above-mentioned a kind of injection moulding machine mode-locking system, each cutting unit includes the stop valve with corresponding Mode-locking oil cylinder UNICOM, and stop valve is provided with pilot valve, and described pilot valve is by shuttle valve and the second oil circuit UNICOM and pilot valve and fuel tank UNICOM.
In above-mentioned a kind of injection moulding machine mode-locking system, described Mode-locking oil cylinder has a locking piston bar and Mode-locking oil cylinder is divided into rod chamber and rodless cavity by locking piston bar, described rod chamber and stop valve UNICOM, described rodless cavity and the first oil circuit UNICOM.
In above-mentioned a kind of injection moulding machine mode-locking system, described rod chamber is by overflow valve and fuel tank UNICOM.
In above-mentioned a kind of injection moulding machine mode-locking system, each Mode-locking oil cylinder is all connected with pressure sensor and each pressure sensor all with corresponding rod chamber UNICOM.
An oil circuit control method for injection moulding machine mode-locking system, concrete steps are as follows:
Pilot valve is in closed condition and makes stop valve be in opening, and fluid enters rod chamber and promotes locking piston bar move inward through the second oil circuit, stop valve, and the fluid of rodless cavity is through the first oil circuit oil return;
Opening pilot valve makes stop valve be in closed condition, and now Mode-locking oil cylinder forms enclosed cavity, and each oil circuit is in packing state, and locking piston bar position remains unchanged;
Closing pilot valve makes stop valve again be in opening, and fluid enters rodless cavity through the first oil circuit and promotes the outwards movement of locking piston bar, and the fluid in rod chamber is successively through stop valve, the second oil circuit oil return.
Compared with prior art, the present invention adopts being equipped with of stop valve and pilot valve, is closed by Mode-locking oil cylinder, improve locked mode rigidity during injection when locked mode, avoids to allow the generation of mould phenomenon, thus improves the quality of product; In addition, each Mode-locking oil cylinder adopts the independent form controlled, and can regulate internal oil pressure according to External infusion power, regulates reliable; And being particularly useful for eccentric mould, result of use is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of a preferred embodiment of the present invention.
In figure, 10, fuel tank; 21, the first oil circuit; 22, the second oil circuit; 30, Mode-locking oil cylinder; 31, rod chamber; 32, rodless cavity; 33, locking piston bar; 40, stop valve; 50, pilot valve; 60, shuttle valve; 70, overflow valve.
Detailed description of the invention
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, this injection moulding machine mode-locking system comprises:
Fuel tank 10, for storing fluid;
First oil circuit 21, with fuel tank 10 UNICOM and for delivering oil;
Second oil circuit 22, with fuel tank 10 UNICOM and for delivering oil;
Mode-locking oil cylinder 30, be set to multiple and each Mode-locking oil cylinder 30 all with the first oil circuit 21 UNICOM;
Cutting unit, with Mode-locking oil cylinder 30 one_to_one corresponding, cutting unit is with the second oil circuit 22 UNICOM and for driving corresponding Mode-locking oil cylinder 30 to carry out locked mode.
Produce for avoiding mould and allow mould phenomenon, ensure the quality of injecting products, locking force of injection machine must be greater than cavity pressure, but the clamp force scope of same injection machine is certain, cannot meet the mould of multiple different cavity pressure, utilization rate of equipment and installations is low, and when injection moulding is produced, cost is higher.
In addition, mostly adopt during existing injection moulding machine mode-locking and unified control each Mode-locking oil cylinder 30, locked mode rigidity is lower, keeps away unavoidably to allow mould phenomenon, and injecting products easily produces overlap, and product quality is low.Particularly when carrying out locked mode to eccentric mould, the defect of unified each Mode-locking oil cylinder 30 of control is just more obvious, cannot adjust clamp force pointedly, thus the scrappage causing product higher.
For this reason, the present invention devises a kind of injection moulding machine mode-locking system, adopt the independent Mode-locking oil cylinder 30 arranged, on each Mode-locking oil cylinder 30, cutting unit has all been installed simultaneously, to make corresponding Mode-locking oil cylinder 30 form enclosed cavity when completing high-voltage lock mould, and then can autobalance external and internal pressure, improve locked mode rigidity, avoid generation allow mould phenomenon, thus improve the quality of product.
Preferably, each cutting unit includes the stop valve 40 with corresponding Mode-locking oil cylinder 30 UNICOM, and stop valve 40 is provided with pilot valve 50, pilot valve 50 by shuttle valve 60 with the second oil circuit 22 UNICOM and pilot valve 50 and fuel tank 10 UNICOM.
Particularly, in the present embodiment, control stop valve 40 by pilot valve 50 and close, and then control Mode-locking oil cylinder 30 becomes enclosed cavity, thus realize the function automatically regulating internal pressure.Wherein, the setting of shuttle valve 60 is that conveniently a part of fluid controls the open and close of stop valve 40 as control oil.
Wherein, pilot valve 50 also with fuel tank 10 UNICOM, when controlling oil when shuttle valve 60, pilot valve 50 enter stop valve 40 (pilot valve 50 is in opening), controlling oil generation pressure and stop valve 40 cut out; Otherwise when pilot valve 50 is closed, control oil and cannot enter stop valve 40 through shuttle valve 60, pilot valve 50, the control oil being now originally positioned at stop valve 40 directly flows back to fuel tank 10 through pilot valve 50, and stop valve 40 is in opening, and fluid can pass in and out stop valve 40.
Further preferably, Mode-locking oil cylinder 30 has a locking piston bar 33 and Mode-locking oil cylinder 30 is divided into rod chamber 31 and rodless cavity 32 by locking piston bar 33, rod chamber 31 and stop valve 40 UNICOM, rodless cavity 32 and the first oil circuit 21 UNICOM.
During high-voltage lock mould, fluid enters the rod chamber 31 of Mode-locking oil cylinder 30 through the second oil circuit 22, stop valve 40, and the fluid in rodless cavity 32 is through the first oily oil return.
Preferably, rod chamber 31 is by overflow valve 70 and fuel tank 10 UNICOM.The setting of overflow valve 70 can be protected rod chamber 31, and avoid the phenomenon of hypertonia because stop valve 40 damages to occur, when the oil pressure of rod chamber 31 reaches the opening pressure of overflow valve 70, the fluid in rod chamber 31 can flow back to fuel tank 10 through overflow valve 70;
Further preferably, each Mode-locking oil cylinder 30 is all connected with pressure sensor and each pressure sensor all with corresponding rod chamber 31 UNICOM.
In the present embodiment, each Mode-locking oil cylinder 30 is independent setting, during high-voltage lock mould, the different pressures that can be subject to according to present position after Mode-locking oil cylinder 30 forms enclosed cavity regulates internal oil pressure pressure (i.e. clamp force) automatically, to balance internal oil pressure pressure and outside injection pressure, be conducive to the pressure balance of whole mould, avoid generation allow mould phenomenon, contribute to producing high-quality product.
Each Mode-locking oil cylinder 30 is all connected with respective pressure sensor, and pressure sensor can detect the pressure of corresponding Mode-locking oil cylinder 30, and convenient operation person controls related work process according to the size of pressure.
Present invention also offers a kind of oil circuit control method of injection moulding machine mode-locking system, set forth with regard to one of them cutting unit in the present embodiment, concrete steps are as follows:
The first step: pilot valve 50 is in closed condition and makes stop valve 40 be in opening, fluid enters rod chamber 31 and promotes locking piston bar 33 move inward through the second oil circuit 22, stop valve 40, and the fluid of rodless cavity 32 is through the first oil circuit 21 oil return;
Now injection machine is in high-voltage lock mould state, and fluid enters stop valve 40, rod chamber 31 successively through the second oil circuit 22, promotes locking piston bar 33 and moves inward and by the fluid of rodless cavity 32 by the first oil circuit 21 draining, complete high-voltage lock mould work.
Whether the pressure that herein can detect according to pressure sensor reaches force value needed for locked mode judges whether high-voltage lock mould completes.
Second step: open pilot valve 50 and make stop valve 40 be in closed condition, now Mode-locking oil cylinder 30 forms enclosed cavity, and each oil circuit is in packing state, and locking piston bar 33 position remains unchanged;
After high-voltage lock mould completes, open pilot valve 50, part control oil enters pilot valve 50 through shuttle valve 60 and controls stop valve 40 closes, and Mode-locking oil cylinder 30 forms enclosed cavity, now Mode-locking oil cylinder 30 can regulate the oil pressure pressure of self according to External infusion pressure, guarantees pressure balance.
3rd step: close pilot valve 50 and make stop valve 40 again be in opening, fluid enters rodless cavity 32 through the first oil circuit 21 and promotes locking piston bar 33 outwards movement, and the fluid in rod chamber 31 is successively through the oil return of stop valve 40, second oil circuit 22.
After injection completes, close pilot valve 50, the control oil being originally positioned at stop valve 40 directly flows back to fuel tank 10 through pilot valve 50, and stop valve 40 is opened.Now, fluid enters rodless cavity 32 through the first oil circuit 21 to promote locking piston bar 33 outwards mobile and returned by the former road of stop valve 40, second oil circuit 22 by the fluid in rod chamber 31 and carry out draining.
Be more than a folding mold process of injection machine, after once completing, capable of circulationly carry out above-mentioned work.
The present invention is reasonable in design, employing stop valve 40 is equipped with pilot valve 50, when locked mode, Mode-locking oil cylinder 30 is closed, each Mode-locking oil cylinder 30 adopts the independent form controlled simultaneously, internal oil pressure can be regulated according to External infusion power, avoid and allow the generation of mould phenomenon, thus improve the quality of product, be worth widely using.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.

Claims (6)

1. an injection moulding machine mode-locking system, is characterized in that, comprising:
Fuel tank, for storing fluid;
First oil circuit, with fuel tank UNICOM and for delivering oil;
Second oil circuit, with fuel tank UNICOM and for delivering oil;
Mode-locking oil cylinder, be set to multiple and each Mode-locking oil cylinder all with the first oil circuit UNICOM;
Cutting unit, with Mode-locking oil cylinder one_to_one corresponding, described cutting unit is with the second oil circuit UNICOM and for driving corresponding Mode-locking oil cylinder to carry out locked mode.
2. a kind of injection moulding machine mode-locking system according to claim 1, it is characterized in that, each cutting unit includes the stop valve with corresponding Mode-locking oil cylinder UNICOM, and stop valve is provided with pilot valve, and described pilot valve is by shuttle valve and the second oil circuit UNICOM and pilot valve and fuel tank UNICOM.
3. a kind of injection moulding machine mode-locking system according to claim 2; it is characterized in that; described Mode-locking oil cylinder has a locking piston bar and Mode-locking oil cylinder is divided into rod chamber and rodless cavity by locking piston bar, described rod chamber and stop valve UNICOM, described rodless cavity and the first oil circuit UNICOM.
4. a kind of injection moulding machine mode-locking system according to claim 3, is characterized in that, described rod chamber is by overflow valve and fuel tank UNICOM.
5. a kind of injection moulding machine mode-locking system according to claim 3 or 4, is characterized in that, each Mode-locking oil cylinder is all connected with pressure sensor and each pressure sensor all with corresponding rod chamber UNICOM.
6. an oil circuit control method for injection moulding machine mode-locking system, is characterized in that, comprise step:
Pilot valve is in closed condition and makes stop valve be in opening, and fluid enters rod chamber and promotes locking piston bar move inward through the second oil circuit, stop valve, and the fluid of rodless cavity is through the first oil circuit oil return;
Opening pilot valve makes stop valve be in closed condition, and now Mode-locking oil cylinder forms enclosed cavity, and each oil circuit is in packing state, and locking piston bar position remains unchanged;
Closing pilot valve makes stop valve again be in opening, and fluid enters rodless cavity through the first oil circuit and promotes the outwards movement of locking piston bar, and the fluid in rod chamber is successively through stop valve, the second oil circuit oil return.
CN201610049949.XA 2016-01-25 2016-01-25 A kind of injection moulding machine mode-locking system and its oil circuit control method Active CN105538624B (en)

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Application Number Priority Date Filing Date Title
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CN105538624B CN105538624B (en) 2017-11-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202668939U (en) * 2012-08-13 2013-01-16 宁波华美达机械制造有限公司 Mold locking circuit for injection mold machine
CN203092979U (en) * 2012-11-28 2013-07-31 中山力劲机械有限公司 Injection molding machine hydraulic system for eliminating die sinking abnormal sounds
CN104085094A (en) * 2014-05-22 2014-10-08 杭州硕博物资有限公司 Die opening thimble synchronizing loop of single pump system injection molding machine
CN104271331A (en) * 2012-02-13 2015-01-07 赫斯基注塑系统有限公司 Flow of hydraulic fluid from accumulator assembly and from pump assembly to actuator where higher flow is required
CN205522360U (en) * 2016-01-25 2016-08-31 海天塑机集团有限公司 Injection molding machine mode locking system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104271331A (en) * 2012-02-13 2015-01-07 赫斯基注塑系统有限公司 Flow of hydraulic fluid from accumulator assembly and from pump assembly to actuator where higher flow is required
CN202668939U (en) * 2012-08-13 2013-01-16 宁波华美达机械制造有限公司 Mold locking circuit for injection mold machine
CN203092979U (en) * 2012-11-28 2013-07-31 中山力劲机械有限公司 Injection molding machine hydraulic system for eliminating die sinking abnormal sounds
CN104085094A (en) * 2014-05-22 2014-10-08 杭州硕博物资有限公司 Die opening thimble synchronizing loop of single pump system injection molding machine
CN205522360U (en) * 2016-01-25 2016-08-31 海天塑机集团有限公司 Injection molding machine mode locking system

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