CN103921418A - Injection Forming Machine - Google Patents

Injection Forming Machine Download PDF

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Publication number
CN103921418A
CN103921418A CN201410006804.2A CN201410006804A CN103921418A CN 103921418 A CN103921418 A CN 103921418A CN 201410006804 A CN201410006804 A CN 201410006804A CN 103921418 A CN103921418 A CN 103921418A
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CN
China
Prior art keywords
pump
injection
work
carry
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410006804.2A
Other languages
Chinese (zh)
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CN103921418B (en
Inventor
神野镇绪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Steel Works Ltd
Original Assignee
Meiki Seisakusho KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2013005133A priority Critical patent/JP5757585B2/en
Priority to JP2013-005133 priority
Application filed by Meiki Seisakusho KK filed Critical Meiki Seisakusho KK
Publication of CN103921418A publication Critical patent/CN103921418A/en
Application granted granted Critical
Publication of CN103921418B publication Critical patent/CN103921418B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03CDOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/12Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
    • E03C1/16Wash-fountains connected to the waste-pipe
    • 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
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03CDOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/12Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
    • E03C1/22Outlet devices mounted in basins, baths, or sinks
    • E03C1/23Outlet devices mounted in basins, baths, or sinks with mechanical closure mechanisms
    • E03C1/2302Outlet devices mounted in basins, baths, or sinks with mechanical closure mechanisms the actuation force being transmitted to the plug via rigid elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/08Fountains
    • 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
    • B29C2045/1784Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1792Machine parts driven by an electric motor, e.g. electric servomotor
    • 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
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76494Controlled parameter
    • B29C2945/76595Velocity
    • 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
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76655Location of control
    • B29C2945/76658Injection unit
    • B29C2945/76692Injection unit drive means
    • 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
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76822Phase or stage of control
    • B29C2945/76866Mould closing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S4/00Baths, closets, sinks, and spittoons
    • Y10S4/07House plumbing fittings

Abstract

The invention provides an injection forming machine which can realize energy saving for a mold closing device that utilizes an electric motor for realizing high precision and energy saving and requires long-time compression mold closing in an injection device. The injection forming machine (11) utilizes electric motors (15,16) for performing operation of a screw (14) of an injection device (13) and utilizes hydraulic pressure for performing operation of a mold closing cylinder (18) of a mold closing device (17). The injection forming machine (11) is provided with the components of: a first pump (42) which always rotates an electric pump (45) for performing operation of the mold closing device (17); and a second pump (56) which rotates the electric pump for supplying operation oil in operation of the mold closing cylinder, wherein in operation of a random executor (15,16,24,31,35,39) except for the mold closing cylinder (18), an electric pump (55) is stopped or rotates in a lowest speed.

Description

Injection (mo(u)lding) machine
Technical field
The present invention relates to injection (mo(u)lding) machine, it utilizes electro-motor to carry out the work of the screw rod of injection device, and utilizes hydraulic pressure to carry out the work of the matched moulds cylinder body of mold closing mechanism.
Background technology
In injection (mo(u)lding) machine, require to have concurrently the miniaturization of accurate work, energy-saving, forming machine, the various key elements of cost degradation.Especially for the injection device that requires accurate work, wish to make screw rod work with servo motor.In addition, about horizontal mold closing mechanism, compare with using the device of elbow type mechanism, the device of use matched moulds cylinder body more can make the total length miniaturization of forming machine.And about the mold closing mechanism of large-scale injection (mo(u)lding) machine, if drive required electro-motor to use universal product not enough, it is very high that cost becomes, or exist do not have can be corresponding the problems such as electro-motor, mostly in situation, use the matched moulds cylinder body that carrys out work by hydraulic pressure.
As the device that can tackle above-mentioned requirements, can enumerate utilize electro-motor carry out injection device screw rod work and utilize hydraulic pressure to carry out the injection (mo(u)lding) machine of work of the matched moulds cylinder body of mold closing mechanism, about this injection (mo(u)lding) machine, known have a device of recording in Fig. 8 of patent documentation 1.In patent documentation 1, used the screw rod that utilizes servo motor to make to carry out the injection device of fine-limit work to carry out work and utilize hydraulic pressure to make the matched moulds cylinder body of mold closing mechanism work.In addition, as moving platen mobile unit in mold closing mechanism, adopt electro-motor and clamping to adopt the device of the matched moulds cylinder body that utilizes hydraulic pressure, the known device that has patent documentation 2 to record.In patent documentation 2, to the work of pump, utilize frequency converter or servo motor to control rotating speed, thereby realize energy-saving.In addition, in patent documentation 3, recorded following technical scheme: utilizing hydraulic pressure to make in the device of injection (mo(u)lding) machine overall work, with utilizing a plurality of servo motors to carry out the pump of work, and making as required a side pump stop etc.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2012-20415 communique (0042, Fig. 8)
Patent documentation 2: TOHKEMY 2003-181895 communique (claim 1, Fig. 1)
Patent documentation 3: TOHKEMY 2007-69501 communique (claim 1, Fig. 1)
Summary of the invention
The problem that invention will solve
Really as patent documentation 1, the control when work that utilizes electro-motor to carry out the screw rod of injection device can be injected accurately, the while can be realized the energy-saving of injection device.Therefore but the work of mold closing mechanism in the prior art utilizes the large-scale pump that pump rotates all the time to carry out, fail fully to realize the energy-saving of injection (mo(u)lding) machine integral body.In addition, in patent documentation 2, moving platen mobile unit is used electro-motor, therefore can realize energy-saving and high speed and the high-precision movement of the part of above-mentioned mobile unit.But, for injection device, adopt which kind of type of drive clearly not represent, and owing to making the work of other parts of mold closing mechanism utilize the large-scale pump that pump rotates all the time to carry out, therefore for injection (mo(u)lding) machine integral body, fail fully to realize energy-saving.In addition, in patent documentation 3, use a plurality of pumps that utilize servo motor work, and make as required a side pump stop, therefore as hydraulic mechanism, can realize energy-saving.But, owing to controlling all mechanisms of injection (mo(u)lding) machine by hydraulic pressure, therefore directly make the device of the work such as injection device compare with utilizing the electro-motors such as servo motor, can not fully realize energy-saving, and have the problem of cannot high accuracy controlling injection device etc.
For this reason; the clamping that the object of this invention is to provide a kind of mold closing mechanism is used the injection (mo(u)lding) machine of hydraulic pressure, for the mold closing mechanism that uses electro-motor to realize high precision int and energy-saving at injection device and need to compress for a long time matched moulds, also can realize energy-saving.
For the method for dealing with problems
Injection (mo(u)lding) machine described in the solution of the present invention 1, utilizes electro-motor to carry out the work of the screw rod of injection device, and utilizes hydraulic pressure to carry out the work of the matched moulds cylinder body of mold closing mechanism, it is characterized in that possessing: the first pump that electro-motor rotates all the time; And second pump, when closing cylinder body running, make electro-motor rotation and supply with working oil, during any actuator work beyond matched moulds cylinder body, electro-motor stops or rotating with minimum speed.
Injection (mo(u)lding) machine described in the solution of the present invention 2, on the basis of scheme 1, it is characterized in that, the work of the mould switching mechanism of mold closing mechanism is undertaken by electro-motor, at least more than half time of the working time of above-mentioned mould switching mechanism, the rotation of above-mentioned the second pump stops or rotating with minimum speed.
Injection (mo(u)lding) machine described in the solution of the present invention 3, on the basis of scheme 1 or 2, is characterized in that, above-mentioned the first pump utilizes frequency converter to carry out the rotating speed of control pump, and above-mentioned the second pump utilizes servo motor to carry out the rotating speed of control pump.
Injection (mo(u)lding) machine described in the solution of the present invention 4 on the basis of any one, is characterized in that in scheme 1 to 3, and the utilization of matched moulds cylinder body comes the valve of work to carry out work by pilot pressure, and pilot pressure is guaranteed by the work of above-mentioned the first pump.
The effect of invention
Injection (mo(u)lding) machine of the present invention, utilizes electro-motor to carry out the work of the screw rod of injection device, and utilizes hydraulic pressure to carry out the work of the matched moulds cylinder body of mold closing mechanism, possesses: the first pump that electro-motor rotates all the time in order to carry out the work of mold closing mechanism; And second pump, during any actuator work beyond matched moulds cylinder body, electro-motor stops or with minimum speed rotation, therefore, not only can realize high precision int and the energy-saving of injection device, can also realize the energy-saving of mold closing mechanism.
Accompanying drawing explanation
Fig. 1 is the hydraulic circuit of injection (mo(u)lding) machine and the key diagram of control device of present embodiment.
Fig. 2 means the time diagram of each operation of the injection (mo(u)lding) machine of present embodiment.
The figure of the work of pump when Fig. 3 means the cutting-off controlling of injection (mo(u)lding) machine of present embodiment.
Fig. 4 means the figure of job control of the pump of mold closing operation, die sinking operation (pressure control) of the injection (mo(u)lding) machine of present embodiment etc.
Fig. 5 means the figure of job control of pump of matched moulds operation of the injection (mo(u)lding) machine of present embodiment, is the figure of supercharging operation (pressure control).
Fig. 6 means the figure of job control of pump of the powerful die sinking operation (speed control) of the injection (mo(u)lding) machine of present embodiment.
Fig. 7 means the figure of job control of the second pump of the taking-up operation (speed control) of the injection (mo(u)lding) machine of present embodiment.
In figure:
11-injection (mo(u)lding) machine, 13-injection device, 14-screw rod, 15,16,31,55-servo motor, 17-mold closing mechanism, 18-matched moulds cylinder body, 42-the first pump, 44-frequency converter, 45-electro-motor, 54-pressure-reducing valve, 56-the second pump.
The specific embodiment
With reference to Fig. 1, the injection (mo(u)lding) machine 11 of embodiments of the present invention is described.Injection (mo(u)lding) machine 11 be utilize electro-motor 15,16 be arranged at the injection device 13 on base 12 screw rod 14 work and utilize hydraulic pressure to be arranged at equally the injection (mo(u)lding) machine 11 of work of the matched moulds cylinder body 18 of the mold closing mechanism 17 on base 12.First, injection device 13 is described, in the endoporus of the inside of cartridge heater 19, screw rod 14 arranges in the mode that can rotate and can forward-reverse.And, in the place ahead of cartridge heater 19, be provided with nozzle 20.In addition, be fixed with on the header board 21 of cartridge heater 19, the supply hole 22 of material is towards the endoporus of cartridge heater 19 and arrange.And, in the front portion of header board 21, be provided with and make the whole forward-reverse of injection device 13 and nozzle 20 is contacted to the cylinder body portion of the cylinder body 24 of use with the nozzle of the nozzle contact mechanism of cover half 23 butts.In addition, the actuator of nozzle contact mechanism can be also the mechanism that uses electro-motor and ball-screw etc.
In addition, at the rear of header board 21, (in Fig. 1, being right side) is provided with rear plate 25, is provided with push pedal 26(intermediate plate can carry out forward-reverse on the straight action-oriented part being arranged on base 12 between header board 21 and rear plate 25).And, on rear plate 25, fixedly make the servo motor 15(electro-motor of the injection of screw rod 14 forward-reverses), the driving shaft of servo motor 15 and ball-screw link.In addition, in push pedal 26, be fixed with ball-screw nut, on above-mentioned ball-screw nut, intert ball-screw, by ball-screw, be rotated and make push pedal 26 carry out forward-reverse to move.And, in push pedal 26, be fixed with the servo motor 16(electro-motor of the metering use that makes screw rod 14 rotations), the driving shaft of servo motor 16 is connected with the rear of screw rod 14 via band, and links with the belt wheel being fixed on the rotating shaft being supported by push pedal 26 axles.In addition, injection device 13 also can by header board 21 fixedly the servo motor of injection (electro-motor) and on rear plate two plates of the servo motor (electro-motor) of fixing metering use form.Injection device 13 using the actuator of drive screw 14 as electro-motor as above can carry out high-precision control when injecting or while measuring, and also excellent aspect energy-saving.
Secondly, mold closing mechanism 17 is described, near four jiaos of the fixed form 27 being fixedly installed with respect to base 12, be provided with matched moulds cylinder body 18.And the piston rod of matched moulds cylinder body 18 forms connecting rod 28, near four jiaos of sleeves (pilot hole) of connecting rod 28 interspersed movable templates 29.In addition, the central authorities at fixed form 27 are formed with for the interspersed conical hole of the nozzle 20 of injection device 13.And, the piston rod of the hydraulic cylinder 24 of said nozzle contact use is installed in the both sides in the above-mentioned hole of fixed form 27.In addition, in fixed form 27, on the template face contrary with injection device, cover half 23 is installed, nozzle 20 is via above-mentioned Kong Eryu cover half 23 butts.And the actuator that is fixed with respectively mould switching mechanism in the two sides of fixed form 27 is servo motor 31(electro-motor), on the driving shaft of servo motor 31, link and have ball-screw 32.In addition, in the two sides of movable template 29, be fixed with ball-screw nut 33, the interspersed ball-screw nut 33 of above-mentioned ball-screw 32.Utilize this mechanism, in the present embodiment, the movement (mould switching) of movable template 29 utilizes electro-motor to carry out.In addition, the servo motor 31 of mould switching mechanism also can be fixed on base 12, and mould switching mechanism also can utilize hydraulic cylinder to carry out work.
In addition, in the periphery of connecting rod 28, be provided with the engaging portion 34 that is formed with a plurality of grooves, the outer side surface of movable template 29 for connecting rod 28 interspersed sleeve part near, be provided with the halfnut mechanism that utilizes hydraulic cylinder 35 to make halfnut 36 work.On base 12, along mould, open and close direction and be provided with the guide rails (not shown) such as straight action-oriented part, movable template 29 is by above-mentioned rail guidance.And movable template 29 can utilize mould switching mechanism guided and move to mould switching direction by above-mentioned guide rail and connecting rod 28.On the template face of the movable template 29 relative with fixed form 27, dynamic model 38 is installed.And, at the back side (opposition side of the installed surface of dynamic model 38) of movable template 29, the ejecting mechanism 40 that possesses hydraulic cylinder 39 is installed.In addition, the actuator of halfnut mechanism and ejecting mechanism 40 also can utilize electro-motor to carry out work.
Then, with reference to Fig. 1, control device 41 and the hydraulic circuit of injection (mo(u)lding) machine 11 are described.First, the first pump 42 is described, on fuel tank 43, be connected with the first pump 42, the first pumps 42 can utilize frequency converter 44 control time per units pump rotating speed and rotarily actuate.And frequency converter 44 is controlled by connected control device 41, by utilizing frequency converter 44 controlled frequencies to control electro-motor 45(three-phase induction motor) rotating speed.In the present embodiment, the first pump 42 uses the axial type piston of variable capacity type.And the angle of the swash plate of the discharge capacity of change the first pump 42 is by discharge capacity change cylinder body 46(compensator) switch.Via discharging capacity switching valve 47, to discharge capacity change cylinder body 46, supply with working oil, in the situation that the quantity delivered (supply pressure) of the working oil of supplying with to discharge capacity change cylinder body 46 seldom or do not have, the piston rod of discharge capacity change cylinder body 46 returns by spring, thereby the angle of swash plate becomes zero or minimum state.
In addition, from first conduit 49 branches of the first pump 42 and be set side by side with the first safety valve 50 and the second safety valve 51 that setting pressure is different.And, so which in above-mentioned the first safety valve 50 or the second safety valve 51 is communicated with and switches to object with discharge capacity change cylinder body 46, be provided with the transfer valve 52 that carries out electromagnetism work.The setting pressure of the first safety valve 50 and the second safety valve 51 can be inputted and be changed via control device 41 by setting.In addition, above-mentioned transfer valve 52 is also by coming the signal of self-control device 41 to switch.So, the first pump 42 of present embodiment is that can to control be the pump that two setting pressures and delivery flow also can utilize frequency converter to carry out closed-loop control, therefore contributes to realize energy-saving.And, when the rotating speed of the first pump 42 is reduced, also contribute to prevent noise.In addition, the setting pressure of the first pump 42 both can also can change to 3 grades of above a plurality of levels for 1 grade.Or the setting pressure of the first pump 42 also can be carried out stepless change.In the situation that axial type piston pump that can stepless change setting pressure, if become the setting pressure of setting in pump 31 1 sides or approach setting pressure when carrying out pressure control, throttling transfer valve 39 carries out work with the work interlock of not shown control ratio valve or electromagnetic proportional valve, thus the angle of the swash plate of change pump 42.In the case, in the setting pressure of pump one side, can between the upper limit and lower limit, carry out stageless setting.In the situation that carry out the cutting-off controlling of pump 42 in said apparatus, if approach setting pressure the angle of swash plate change gradually, the discharge rate of rotating is each time reduced, if become setting pressure, come the discharge rate of self-pumping 42 become zero or approach zero value, so can alleviate the load of the electro-motor that makes pump 42 rotations.And, can be more than power consumption aequum.
In addition, with regard to the first pump 42, being not limited to axial type piston pump, can be also gear pump or vane pump etc.And, with regard to the drive source of the first pump 42, can be both with servo motor, rotating speed to be carried out the device of closed-loop control, can be also to utilize the electro-motor that does not carry out closed-loop control to carry out the device rotating with constant rotational speed all the time.
On the pipeline 48 from the first pump 42, be provided with check-valves 53, at its front end (away from a side of pump), be provided with the pressure-reducing valve 54(electromagnetic pressure control valve that is carried out closed-loop control).Thereby, even if supply with pressure in the first pump 42, be controlled as any in two pressure, also can utilize the further pressure of pressure-reducing valve 54 to control for required pressure and to supply working oils such as matched moulds cylinder bodies 18.The front end of pressure-reducing valve 54 branches out pipeline 48, in the present embodiment, with the matched moulds cylinder body 18 of clamping, the hydraulic cylinder 24 of the nozzle of the hydraulic cylinder 35 of halfnut mechanism, nozzle contact mechanism contact use be connected.Hydraulic cylinder 39 at this ejecting mechanism 40 utilizes the second pump 56 of being controlled by servo motor 55 described later to supply with working oil, but also can supply with working oil from the first pump 42.
Hydraulic circuit to each hydraulic cylinder 18,24,35,39 as actuator describes, at the matched moulds of matched moulds cylinder body 18, with being connected with the pipeline of the matched moulds side 18a of grease chamber side on the 18a of grease chamber to supply with working oils via tubular inserted valve 57, on the pipeline at the matched moulds of the front end of tubular inserted valve 57 by the 18a of grease chamber side, be provided with hydrostatic sensor 58.And, from matched moulds, with the pipeline of the line branching of the 18a of grease chamber side, be provided with the open and close valve 59 of decompression use.In addition, for above-mentioned tubular inserted valve 57, via first conduit 60, utilize pilot pressure to control, so be provided with the transfer valve 61 that carries out electromagnetism work for the pilot pressure of first conduit 60 is supplied with and cut off.In addition, the die sinking of matched moulds cylinder body 18 connects via tubular inserted valve 62 similarly with the 18b of grease chamber, and the die sinking of the front end of tubular inserted valve 62 is connected with the 18b of grease chamber with die sinking with the pipeline of the 18b of grease chamber side.And, from die sinking, with the pipeline of the line branching of the 18b of grease chamber side, be provided with the open and close valve 63 that pressure release is used.In addition, for above-mentioned tubular inserted valve 62, via first conduit 64, utilize pilot pressure to control, so formerly conduit 64 is provided with the transfer valve 65 that carries out electromagnetism work, for pilot pressure is supplied with and cut off.
Hydraulic cylinder 24 for the hydraulic cylinder 35 of halfnut mechanism and the nozzle of nozzle contact mechanism contact use, via pressure-reducing valve 66,67, at its front end (cylinder body side), be provided with the four-way switching valve 75,76 that carries out electromagnetism work, thereby the chamber of a side of the supply working oil of cylinder body is switched.And although not shown, also cover half 23 or dynamic model 38 also utilize gate valve, core travel mechanism, mould installing mechanism etc. to use hydraulic cylinder sometimes.
Then, the second pump 56 is described, on fuel tank 43, be connected with the second pump 56 of the rotating speed that utilizes servo motor 55 control pumps.The second pump 56 is the constant gear pumps of discharge rate that rotate each time.And the servo motor 55 of the second pump 56 utilizes servo amplifier 68 control current value and the rotating speed of the time per unit of electro-motor is carried out to closed-loop control.In addition, the responsiveness that stops and starting rotation of the second pump 56 is also excellent.Servo amplifier 68 is used to the signal of self-control device 41 and controls.The second pump 56 of present embodiment is duplex pump, and a pump 56a is connected with the hydraulic cylinder 39 of ejecting mechanism 40 with being arranged at the four-way switching valve that carries out electromagnetism work 70 of pipeline 69 via pipeline 69.In addition, the hydraulic cylinder 39 of ejecting mechanism 40 can replace carrying out the four-way switching valve 70 of open loop control, uses the flow control valve with direction handoff functionality that servo valve or other carry out closed-loop control to control with high accuracy more.And another pump 56b is connected with the pipeline 48 of supplying with working oil from the first pump 42 with being arranged at the check-valves 72 of above-mentioned pipeline 71 via pipeline 71.And the pipeline 69,71 of supplying with working oil from two pump 56a, 56b, can utilize the open and close valve 74 that carries out electromagnetism work be connected and cut off with pipeline 73.In addition, each pipeline 69,71 is respectively equipped with safety valve 77,78, for protecting loop or the use such as when the working oil drainage that makes a side in the time can not controlling servo motor 55.In addition, in the present embodiment, although utilize the second pump 56 to make hydraulic cylinder 39 work of ejecting mechanism 40, also can make other hydraulic cylinder 35 grades also utilize the second pump 56 work.
In addition, stopping or with the second pump 56 of minimum speed rotation, be not limited to gear pump during about any actuator work beyond this matched moulds cylinder body 18 as the servo motor 55 of electro-motor, can be also axial piston pump or vane pump etc.And the drive source of the second pump 56 can be also the motor that uses Frequency Converter Control rotating speed.In addition, in the present embodiment, the second pump 56 uses multiplex pump, but can be also independent pump.And, in the present embodiment, although supply with the pump of working oil, by the first pump 42 and second pump 56 these two pumps 42,56, formed, also can further be provided with the 3rd pump, the 4th pump, the 5th pump ... etc. a plurality of pumps.In addition, above-mentioned the 3rd pump, the 4th pump, the 5th pump etc. can be both the pumps rotating all the time, can be also the pumps stopping the rotation.And, the working oil a large amount of to fuel tank drainage under the state that pump is worked all the time in the prior art, and do not carry out in the present invention the drainage of this large amount of working oil, so contribute to energy-saving.
In addition, servo motor 15, the servo motor 16 of metering use, the servo motor 31 of the mould switching mechanism of movable template 29 about above-mentioned injection is connected with control device 41 via not shown servo amplifier, and utilizes control device 41 to carry out closed-loop control.
Then, with reference to Fig. 2 to Fig. 7, the control method of injection (mo(u)lding) machine 11 is described.In the present embodiment, as an example as shown in Figure 3, the setting pressure of the first safety valve 50 that the supply pressure of the first pump 42 is switched is 8MPa as an example, and the setting pressure of the second safety valve 51 is 18MPa as an example.As shown in Figure 2, the actuator that makes movable template 29 move in mold closing operation utilizes servo motor 31 to carry out.Now, the first pump 42 utilizes transfer valve 52 to connect the first safety valve 50 and discharge capacity change cylinder body 46(compensator).Thereby the setting pressure of the working oil of carrying from the first pump 42 to pipeline 48 as shown in Figure 4, becomes the required 8MPa of pilot pressure that maintains first conduit 60,64 etc.And, the rotating speed of the first pump 42 also by controlling frequency converter 44 with low speed rotation.If now the pressure of the working oil of the first conduit 49 of pipeline 48 and the first pump 42 approaches 8MPa, the skew of the first safety valve 50 is worked, from the first safety valve 50, via discharging the working oil of capacity switching valve 47 to 46 supplies of discharge capacity change cylinder body, increase, the deflection angle of the swash plate of the first pump 42 switches to small deflection angle from large deflection angle, carries out cutting-off controlling.Thereby if the pressure of the working oil of pipeline 48 grades becomes near setting pressure or setting pressure, the discharge rate of rotation each time of the first pump 42 automatically reduces, the load that drives the electro-motor 45 of the first pump 42 reduces and contributes to energy-saving.And, the now servo motor 55 of the second pump 56 driving of stopping the rotation.In addition, now also can make servo motor 55 be rotated with the minimum speed that can make the second pump 56 rotate a little.
Then, movable template 29 is carried out mold closing, if form die cavity between cover half 23 and dynamic model 38, complete mold closing operation, make hydraulic cylinder 35 work of four-way switching valve 66 work Er Shi halfnut mechanisms, halfnut 36 is coordinated with the engaging portion 34 of connecting rod 28.Then, then transfer to supercharging operation.In supercharging operation, first make matched moulds cylinder body 18 work and piston and connecting rod 28 are moved, thereby eliminate the gap of halfnut 36 and engaging portion 34.And, afterwards the pressure of the working oil of the matched moulds side 18a of grease chamber is boosted and carries out matched moulds.Now the compression area of matched moulds cylinder body 18 is larger, so need to supply with a large amount of working oils for piston and connecting rod 28 are moved.As the work of the hydraulic circuit in supercharging operation, first make transfer valve 61 work and utilize pilot pressure operation tubular inserted valve 57, pipeline 48 sides are communicated with the matched moulds side 18a of grease chamber.
The instruction that the first pump 42 is used to self-control device 41 is by frequency converter 44 controlled frequencies and the rotating speed of electro-motor is carried out to speedup, thereby makes pump High Rotation Speed.And, transfer valve 52 is switched and makes the second safety valve 51 and discharge capacity change cylinder body 46(compensator) be connected.The setting pressure of the working oil of supplying with from the first pump 42 is thus changed as 18MPa.In addition, the method that above-mentioned rotating speed and the change of setting pressure also utilize halfnut 36 to coordinate, but also can be before mold closing will finish or just finished after carry out.In addition, for the second pump 56, before mold closing will finish, make it start rotation in the present embodiment, rotating speed be made as to maximum when mold closing finishes and discharge.Now, open and close valve 74 is opened and the four-way switching valve that leads to cylinder body 39 70 of ejecting mechanism 40 is closed, and from the twocouese matched moulds cylinder body 18 of double pump 56a, 56b, supplies with working oil.In addition, when starting this supply, also can be when mold closing finish, or lag behind a little and start to carry out the rotation of the second pump 56.
Thereby in the present invention,, when needing most the work (in this case supercharging work) of the matched moulds cylinder body 18 of working oil, as shown in Figure 5, make the second pump 56 work and add up and converge with the working oil from the first pump 42, thereby make 18 work of matched moulds cylinder body.Therefore,, even if the compression area of matched moulds cylinder body 18 is larger, also can make it with higher speed operation and with higher speed, boost.
Then, for example, if the pressure of the working oil being detected by hydrostatic sensor 58 in supercharging operation reaches setting pressure (18MPa), the second pump 56 stop the rotation (or make rotation be reduced to minimum speed).But owing to being provided with check-valves 72, even if therefore stop the second pump 56, the working oil of supplying with from the first pump 42 can not flow backwards to the second pump 56 1 sides yet.Now roughly simultaneously or a little before and after it, the pressure of pipeline 48 reaches 18MPa, therefore the skew that starts a little before the second safety valve 51 from it is worked, and from the second safety valve 51, leaks working oils, via discharging capacity switching valve 47, to discharge capacity, changes the working oil increase that cylinder body 46 is supplied with.And as shown in Figure 3, the deflection angle of carrying out the swash plate of the first pump 42 switches to the cutting-off controlling of small deflection angle from large deflection angle.In addition, about stopping of the second pump 56, also can utilize the angle of the deflection angle of the first pump 42, predefined timing (SECO), by position of the detected mold clamping force of sensor, matched moulds cylinder body 18 etc. and stop.In addition, in foregoing, recorded the example that the setting pressure of matched moulds cylinder body 18 is the identical 18MPa of the setting pressure of the supply side with the first pump 42.But, can utilize pressure-reducing valve 54 at random to control the setting pressure of matched moulds cylinder body 18, for example, control matched moulds cylinder body 18 with 16MPa in the situation that, so that the setting pressure of matched moulds cylinder body 18 mode different from the setting pressure of the supply side of the first pump 42 controlled.And the setting pressure that detects matched moulds cylinder body 18 sides when hydrostatic sensor 58 is the setting pressure of 16MPa(pressure-reducing valve 54) time, the second pump 56 is quit work.
Then, after maintenance operation in, the matched moulds side 18a of grease chamber of matched moulds cylinder body 18 and pipeline 48 etc. have boosted to setting pressure, therefore the angle of the swash plate of the first pump 42 automatically continues to maintain the state of small deflection angle.And the rotating speed of the first pump 42 is controlled rotating speed by frequency converter 44, but maintain High Rotation Speed state.In addition, in keeping operation, also can make the rotating speed of the first pump 42 reduce.In keeping operation, be the supplementary amount from matched moulds cylinder body 18 and hydraulic circuit leakage etc., in order to avoid the pressure drop of the working oil of the matched moulds side 18a of grease chamber of matched moulds cylinder body 18, the working oil of therefore in fact supplying with to the above-mentioned matched moulds side 18a of grease chamber from the first pump 42 is few.Then, if through predetermined time delay, drive injection device 13 injection servo motor 15 and screw rod 14 is advanced, by the molten resin injection fillers measuring in advance in die cavity.So far the hydraulic cylinder 24 of nozzle contact use supplied with working oil and injection device 13 is advanced, thereby making nozzle 20 and cover half 23 butts.Or, according to the difference of forming method, keep in advance the state of nozzle 20 and cover half 23 butts, in advance the hydraulic cylinder 24 of nozzle contact use is enclosed to pressure in the case.In the present embodiment, the actuator of the injection mechanism of injection device 13 is by servo motor 15(electro-motor) drive, so can carry out high-precision control.
In maintenance operation after injection fillers and pressurize, the molten resin in die cavity carries out cooling curing.And, parallel with the cooling curing of molten resin, to keep the state of nozzle contact or nozzle 20 is retreated and the state of valve nozzles 20, to drive measuring the servo motor 16 of use in injection device 13, make screw rod 14 rotations, then carry out the metering of the molten resin for injecting.
Next, in pressure release operation, transfer valve 61 switch and also cuts out tubular inserted valve 57, preventing that working oil is from the first pump 42 side direction matched moulds side 18a of grease chamber supplies.Then, open open and close valve 59 and make the working oil of the matched moulds side 18a of grease chamber turn back to fuel tank 43, make the pressure of the matched moulds side 18a of grease chamber become 0.And, meanwhile or a little before and after it, by transfer valve 52 is switched and the setting pressure of the first pump 42 is made as to low pressure.Now make the rotating speed of the first pump 42 change to low speed rotation by controlling frequency converter 44 simultaneously.The rotating speed of the first pump 42 of pressure release operation in addition, also can keep High Rotation Speed.During the maintenance operation of utilizing injection device 13 to measure concurrently and during pressure release operation, the second pump 56 keeps halted state.
Next, use matched moulds cylinder body 18 to start to carry out opening from cover half 23 the powerful die sinking operation of dynamic model 38.In powerful die sinking operation, transfer valve 65 is switched and makes 62 work of tubular inserted valve, connect the pipeline 48 and the pipeline that is connected to the die sinking side 18b of grease chamber of pump side.Meanwhile or a little, before and after it, the setting pressure of the first pump 42 is made as to high pressure and controls frequency converter 44, thereby the rotating speed of pump is made as to High Rotation Speed.And, by the servo motor 55 that has made to stop, being rotated driving, thereby supplying with working oils from the second pump 56.Now, also can from the latter half of pressure release operation, make servo motor 55 be rotated driving with low speed.
In powerful die sinking operation, for example, with the stroke (tens mm left and right) of being scheduled to the piston of matched moulds cylinder body 18 and piston rod (connecting rod 28) are moved to die sinking direction, and now carry out speed control.About speed, control, as shown in Figure 6, the first pump 42 is supplied with working oil with maximum capacity, the rotating speed of the servo motor 55 of the second pump 56 is carried out to closed-loop control, thereby utilize matched moulds cylinder body 18 to carry out the control of the translational speed of movable template 29 and dynamic model 38.In powerful die sinking operation, carry out as mentioned above speed control, and due to the relation with pressure, the first pump 42 carried out cutting-off controlling before will becoming setting pressure.In addition, the second pump 56 is controlled rotating speed and is carried out speed control, and when pressure reaches setting value, from safety valve 77,78, leaks working oil (safety valve).In addition, the setting pressure of the first pump 42 in powerful die sinking operation is controlled by pressure-reducing valve 54, but also can be identical with the setting pressure of the first pump 42 sides.
After die sinking operation in, matched moulds cylinder body 18 is quit work, after removing the coordinating of engaging portion 34 of halfnut 36 and connecting rod 28, the servo motor 31 of driving mould switching mechanism and make movable template 29 and dynamic model 38 move to die sinking end position.Now, make the first pump 42 for low speed, the slow-speed of revolution, the second pump 56 is stopped.
If movable template 29 and dynamic model 38 stop and finishing die sinking operation at die sinking end position, afterwards utilize ejecting mechanism 40 to make products formed give prominence to and utilize the taking-up operation that not shown withdrawing device shifts.In taking out operation, in order to make ejecting mechanism 40 work, make the servo motor 55 of the second pump 56 be rotated driving.Now safety valve 78 is opened, and the working oil of pump 56b carries out drainage to fuel tank, only has the working oil of pump 56a via four-way switching valve 70, to be supplied to the hydraulic cylinder 39 of ejecting mechanism 40.Now open and close valve 74 is closed, and owing to being provided with check-valves 72, so working oil does not flow into from the first pump side 42.Thereby as shown in Figure 7, ejecting mechanism 40 carries out speed control by controlling the rotating speed of the servo motor 55 of the second pump 56.In addition, now, replace four-way switching valve 70, by use servo valve or other, carry out the flow control valve with direction handoff functionality of closed-loop control, thereby can control more accurately ejecting mechanism 40.In addition, in the situation that ejecting mechanism 40 utilizes electro-motor work, certain the second pump 56 is not worked.And ejecting mechanism 40 also can utilize the working oil of supplying with from the first pump 42 to carry out work.
As mentioned above, in the present invention, the first pump 42 is for the work of each hydraulic cylinder 17,24,35 and keep the pilot pressure of first conduit 60,64 etc., and electro-motor 45 is rotated all the time.And, during any actuator work beyond matched moulds cylinder body 18 of the second pump 56 (such as the servo motor 15 of injection, the servo motor 16 of metering use, mould while opening and closing servo motor 31 work of use or halfnut use the work such as hydraulic cylinder 35 time), electro-motor (servo motor 55) stops or rotating with minimum speed, if only supplied with from the first pump 42, when the undersupply of working oil, at least to be greater than the height rotation of minimum speed, be rotated driving, thereby supply with working oil.
Thereby; for example, except the matched moulds cylinder body 18 of the clamping of mold closing mechanism 17; also utilize hydraulic cylinder to make in the situation of mould switching mechanism work; mould opens and closes the hydraulic cylinder of use need to supply with a large amount of working oils, therefore in mold closing operation and die sinking operation, also makes the second pump 56 rotarily actuate and supply working oil.In the present invention, in the situation that utilizing electro-motor to make injection device 13 work, the larger cylinder body of quantity delivered for the working oil of mold closing mechanism 17 sides, and with using the second motor 56 of servo motor 55 to carry out the supply of working oil, for the little hydraulic cylinder (in the present embodiment except the hydraulic cylinder 39 of ejecting mechanism 40) of other the quantity delivered of working oil or to the supply of the working oil of first conduit, by carrying out the supply of working oil with the first pump 42 that carries out the electro-motor 45 of VFC, thereby can realize energy-saving.
Utilizability in industry
About the present invention, although do not do one by one and exemplify, be not limited to above-mentioned present embodiment, certainly also can be applicable to the mode that those skilled in the art change based on aim of the present invention.Injection (mo(u)lding) machine as object of the present invention does not limit its size and structure, and is applicable to be large-scale injection (mo(u)lding) machine more than 800t and do not use elbow type mechanism to utilize matched moulds cylinder body to carry out the injection (mo(u)lding) machine of matched moulds such as mold clamping force as an example.And injection (mo(u)lding) machine can be also that movable template is vertically carried out the vertical type injection molding machine of lifting moving.In addition, injection (mo(u)lding) machine also can be provided with rotary table in movable template.And the quantity of injection device is not limited to 1, also can use a plurality of injection devices to carry out the moulding of multicolour forming product.And, in the situation that injection (mo(u)lding) machine carries out the moulding of multicolour forming product, except fixed form, movable template, also can between fixed form and movable template, the intermediate die plate being rotated be set, be installed on the cover half of fixed form and be installed on the intermediate mold of intermediate die plate and be installed on the intermediate mold of intermediate die plate and be installed between the dynamic model of movable template, utilize respectively different resins to carry out moulding, then make intermediate die plate and intermediate mold be rotated and similarly carry out moulding, thereby can carry out the moulding of multicolour forming product.
In addition, in said structure, injection (mo(u)lding) machine also can carry out injection compression molding or foam-formed.Inferior in the situation of carrying out injection compression molding, also accumulator can be set on hydraulic circuit, the boosting of the high speed while realizing matched moulds.And, above-mentioned injection compression molding or foam-formed etc. in, the pressure control of pressure-reducing valve etc. is controlled or controlled to the pressure that the value that also can carry out detected pressures sensor is controlled the rotating speed of servo motor.In addition, in using the structure of 4 matched moulds cylinder bodies, the valve that also can be when compression forming utilizes servo valve etc. can carry out closed-loop control to each matched moulds cylinder body is controlled respectively, thereby carries out parallel control.In addition, injection (mo(u)lding) machine, can also be for the various products formeds such as organic products formed beyond metal forming product, inorganic products formed, resin except for synthetic resin.The hydraulic circuit that utilizes the first pump 42 and the second pump 56 of above-mentioned present embodiment and control method thereof also can be for carrying out the injection (mo(u)lding) machine of work of the screw rod of injection device with hydraulic pressure.Now compare with existing same device, also can realize energy-saving.

Claims (4)

1. an injection (mo(u)lding) machine, utilizes electro-motor to carry out the work of the screw rod of injection device, and utilizes hydraulic pressure to carry out the work of the matched moulds cylinder body of mold closing mechanism, it is characterized in that possessing:
The first pump that electro-motor rotates all the time; And
The second pump makes electro-motor rotation and supply working oil when closing cylinder body running, and when any actuator beyond matched moulds cylinder body is worked, electro-motor stops or rotating with minimum speed.
2. injection (mo(u)lding) machine according to claim 1, is characterized in that,
The work of the mould switching mechanism of mold closing mechanism is undertaken by electro-motor, and at least more than half time of the working time of above-mentioned mould switching mechanism, the rotation of above-mentioned the second pump stops or rotating with minimum speed.
3. injection (mo(u)lding) machine according to claim 1 and 2, is characterized in that,
Above-mentioned the first pump utilizes frequency converter to carry out the rotating speed of control pump, and above-mentioned the second pump utilizes servo motor to carry out the rotating speed of control pump.
4. according to the injection (mo(u)lding) machine described in any one in claims 1 to 3, it is characterized in that,
The utilization of matched moulds cylinder body comes the valve of work to carry out work by pilot pressure, and pilot pressure is guaranteed by the work of above-mentioned the first pump.
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