CN101434125B - Differential pressure type protector of high speed mould closing mechanism - Google Patents
Differential pressure type protector of high speed mould closing mechanism Download PDFInfo
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- CN101434125B CN101434125B CN 200810220230 CN200810220230A CN101434125B CN 101434125 B CN101434125 B CN 101434125B CN 200810220230 CN200810220230 CN 200810220230 CN 200810220230 A CN200810220230 A CN 200810220230A CN 101434125 B CN101434125 B CN 101434125B
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Abstract
The invention relates to a pressure difference type protective device of a high-speed mould matching mechanism. The protective device comprises an electric control system and a hydraulic system; the electric control system comprises a pressure difference control calculation panel connected with a control computer; the hydraulic system comprises a mould matching oil cylinder and a high response proportion directional valve for controlling the action of mould matching; the high response proportion directional valve and a rod cavity and a rodless cavity of the mould matching oil cylinder are in parallel connection; the rod cavity and the rodless cavity of the mould matching oil cylinder are connected with the pressure difference control calculation panel through each pressure sensor; and an output signal is transmitted to the pressure difference control calculation panel. When a machine carries out low-pressure mould matching, the pressure sensor carries out online pressure detection; the signal in the pressure sensor is calculated through the pressure difference control operation panel and is compared with a benchmark signal set by the control computer; if the pressure difference signal is less than a set value, pressure difference between the rod cavity and the rodless cavity of the mould matching oil cylinder is in a normal range and the mould matching force is normal; otherwise, an adjusting signal is output by the control computer; the opening of the high response proportion directional valve is reduced, and the speed of a movable template is rapidly dropped till the mould matching force reaches the requirement of the set value, thereby realizing protection on a precise mould.
Description
Technical field
The present invention relates to a kind of differential pressure type protector of high speed mould closing mechanism, mainly be applicable to the control of the clamping low pressure mold clamping force of injection machine or die casting machine.
Background technology
Common all size and the injection machine of structure or die casting machine, when carrying out the low pressure mould assembling action, the machine computer provides command signal to system's proportional flow control valve and proportional pressure valve, and the direction valve of control mould assembling action, and die cylinder is received instruction and is carried out matched moulds.After adjusting the computer instruction signal, the low pressure mold clamping force can change to some extent, but owing to do not have checkout gear and line closed loop adjustment, control accuracy is lower, and the fluctuation of low pressure mold clamping force is bigger, can not realize protection to precision die.Chinese patent literature CN2451318 variable differential injecting systems toggle rod type injection moulding machine, its novelty is that toggle rod type injection moulding machine injection cylinder is designed to differential cylinder, forms differential injecting systems with the hydraulic differential control loop.Piston is in differential advancing in early stage in the injection process, the low-voltage high speed injection; Later stage is general injection by reversal valve control transformer differential, and the piston compression area increases, and realizes the high pressure injection.This machine is compared with common injection machine, owing to die cylinder, injection cylinder all adopt the variable differential cylinder hydraulic circuit, has improved matched moulds, injection speed.When if design parameter is close with common injection machine, can select the oil pump and the motor of less flow for use, have significantly efficient, energy-saving effect.
Summary of the invention
Purpose of the present invention aims to provide a kind of compact conformation, volume is little, debugging is easy, control accuracy is high, energy consumption is low, low cost of manufacture; and can carry out the differential pressure type protector of low pressure mould protection to ultrahigh speed matched moulds process, to overcome weak point of the prior art.
Press the differential pressure type protector of a kind of high speed mould closing mechanism of this purpose design, comprise electric control system and hydraulic system, its architectural feature is the pressure reduction control operation board that electric control system comprises and the control computer links to each other; Hydraulic system comprises the high response ratio proportional direction valve of die cylinder and control mould assembling action, high response ratio proportional direction valve is in parallel with the rod chamber and the rodless cavity of die cylinder, the rod chamber of die cylinder is controlled operation board by pressure sensor separately with pressure reduction with rodless cavity and is linked to each other, and output signal is transferred to pressure reduction control operation board.
Described pressure reduction control operation board has voltage follower and differential type amplifying circuit, can online reception pressure sensor signal, and carry out real-time operation, its output signal is transferred to the control computer.
The rodless cavity of described die cylinder links to each other with the A end of high response ratio proportional direction valve, and links to each other with pressure reduction control operation board through pressure sensor; The rod chamber of die cylinder links to each other with the B end of high response ratio proportional direction valve, and links to each other with pressure reduction control operation board through pressure sensor; The piston rod of die cylinder promotes moving die plate and drives mould by bar linkage structure.
Described control computer can be realized the closed-loop control function, preestablishes the low pressure mold clamping force, and the output signal of controlling operation board with pressure reduction compares computing, and provides the paramount response ratio proportional direction valve of adjustment signal, realizes effectively accurately controlling of low pressure mold clamping force.
When machine low pressure matched moulds, the online pressure detecting of carrying out of the pressure sensor of die cylinder rod chamber, pressure sensor place signal is after pressure reduction control operation board calculates, the reference signal of setting with the control computer compares, if pressure difference signal is less than setting value, the pressure differential of then representing die cylinder rod chamber and rodless cavity is in normal scope, and mold clamping force is normal; If pressure difference signal, represents then that mold clamping force is bigger than normal greater than setting value, signal is adjusted in the output of control computer; high response ratio proportional direction valve opening reduces; moving die plate speed descends fast, reaches the setting value requirement up to mold clamping force, realizes to the accurate control of low pressure mold clamping force with to the protection of precision die.
Description of drawings
Fig. 1 is pressure reduction control basic principle figure.
Fig. 2 is pressure reduction control operation board wiring schematic diagram.
Fig. 3 is one embodiment of the invention control structure schematic diagram.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Referring to Fig. 1 and Fig. 2, Vi1 and Vi2 are respectively the pressure signals in die cylinder rodless cavity and two chambeies of rod chamber, and Vout is an output signal.Vi1 and Vi2 pass through the computing of differential type amplifying circuit after isolating through voltage follower again, draw pressure differential signal Vout.Computer controller compares this signal with the reference signal of setting in the control computer, if pressure difference signal, represents then that die cylinder piston pressure at two ends difference is in normal range (NR) less than setting value; Otherwise, if the pressure that pressure difference signal Vout, then represents die cylinder one side greater than setting value exceeds normal condition greater than the value of opposite side, thus control computer output low-voltage variation signal.
Mathematical Modeling: Vout=Vi2-Vi1
Electric circuit characteristic: the prime signal plays the effect of buffering, isolation, raising load capacity through voltage follower; The back level is the differential type operational amplifier, because R2=R4 its essence is with differential type amplifying circuit realization subtraction function, thereby obtains the pressure differential signal.
Referring to Fig. 3, when machine low pressure matched moulds, two pressure sensors 1 of the rodless cavity 4 of die cylinder and the pressure detecting of rod chamber 5 and the 2 online pressure detecting of carrying out, signal Vi1 of pressure sensor place and Vi2 flow to pressure reduction control operation board 6, and by controlling operation board 6 through pressure reduction, Vi1 and Vi2 signal are carried out calculus of differences, after the calculating, obtain the pressure differential Vout signal of oil cylinder both sides, the reference signal of setting with control computer 7 compares, if pressure difference signal Vout, then represents the pressure differential of the rod chamber 4 of die cylinder and rodless cavity 5 less than setting value in normal scope, mold clamping force is normal; If pressure difference signal Vout, represents then that mold clamping force is bigger than normal greater than setting value, ultra-low pressure; signal is adjusted in 7 outputs of control computer, starts the low-voltage variation function, and high response ratio proportional direction valve 3 openings reduce; moving die plate 8 speed descend fast, reach the setting value requirement up to mold clamping force.Has higher precision and stability because the sensor signal Vi1 of used detection oil cylinder working-pressure is relative with Vi2; thereby the precision and the high reliability of low-voltage variation have been guaranteed; can realize sensitive mould protection, in actual production, can effectively protect expensive mould 9.
Claims (2)
1. the differential pressure type protector of a high speed mould closing mechanism comprises electric control system and hydraulic system, it is characterized in that electric control system comprises the pressure reduction control operation board (6) that links to each other with control computer (7); Hydraulic system comprises the high response ratio proportional direction valve (3) of die cylinder and control mould assembling action, high response ratio proportional direction valve is in parallel with the rod chamber (5) and the rodless cavity (4) of die cylinder, the rod chamber of die cylinder is controlled operation board by pressure sensor separately with pressure reduction with rodless cavity and is linked to each other, and output signal is transferred to pressure reduction control operation board;
Described pressure reduction control operation board has voltage follower and differential type amplifying circuit, can online reception pressure sensor signal, and carry out real-time operation, its output signal is transferred to the control computer;
The rodless cavity of described die cylinder links to each other with the A end of high response ratio proportional direction valve, and links to each other with pressure reduction control operation board through pressure sensor (1); The rod chamber of die cylinder links to each other with the B end of high response ratio proportional direction valve, and links to each other with pressure reduction control operation board through pressure sensor (2); The piston rod of die cylinder promotes moving die plate (8) and drives mould (9) by bar linkage structure.
2. according to the differential pressure type protector of the described high speed mould closing mechanism of claim 1; it is characterized in that described control computer can realize the closed-loop control function; preestablish the low pressure mold clamping force; compare computing with the output signal of pressure reduction control operation board; and provide the paramount response ratio proportional direction valve of adjustment signal, realize the effectively accurately control of low pressure mold clamping force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810220230 CN101434125B (en) | 2008-12-17 | 2008-12-17 | Differential pressure type protector of high speed mould closing mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810220230 CN101434125B (en) | 2008-12-17 | 2008-12-17 | Differential pressure type protector of high speed mould closing mechanism |
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| CN101434125A CN101434125A (en) | 2009-05-20 |
| CN101434125B true CN101434125B (en) | 2011-03-23 |
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| CN 200810220230 Active CN101434125B (en) | 2008-12-17 | 2008-12-17 | Differential pressure type protector of high speed mould closing mechanism |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102580874A (en) * | 2012-03-05 | 2012-07-18 | 河南天丰节能板材科技股份有限公司 | High-pressure mixing opposite-flushing device |
| CN108068241A (en) * | 2016-11-14 | 2018-05-25 | 天津金典生产力促进有限责任公司 | A kind of remote controlled plastics machinery mold closing mechanism |
| CN109664455A (en) * | 2018-12-27 | 2019-04-23 | 佛山市顺德区震旭塑料机械有限公司 | A kind of injection molding machine with the secondary adjustment mold of inside groove |
| CN113799352A (en) * | 2021-09-28 | 2021-12-17 | 德玛克（长兴）注塑系统有限公司 | Automatic calibration method and device for mold locking force of hinged bottle blank injection molding machine |
| CN114923616A (en) * | 2022-06-06 | 2022-08-19 | 无锡新佳盛压铸机制造有限公司 | Mold clamping force detection device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2925841Y (en) * | 2005-05-31 | 2007-07-25 | 佛山伊之密精密机械有限公司 | Oil-pressure servo controller of injection molding machine |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2925841Y (en) * | 2005-05-31 | 2007-07-25 | 佛山伊之密精密机械有限公司 | Oil-pressure servo controller of injection molding machine |
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Address after: 528300 Guangdong province Foshan city Shunde high tech Zone (Ronggui) No. 22 Keyuan Road three Patentee after: GUANGDONG YIZUMI PRECISION MACHINERY Co.,Ltd. Address before: 528300 Guangdong province Foshan city Shunde high tech Zone (Ronggui) No. 22 Keyuan Road three Patentee before: Guangdong Yizumi Precision Machinery Co.,Ltd. |
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Address after: 528300 Guangdong province Foshan city Shunde high tech Zone (Ronggui) No. 22 Keyuan Road three Patentee after: Yizhimi Co.,Ltd. Address before: 528300 Guangdong province Foshan city Shunde high tech Zone (Ronggui) No. 22 Keyuan Road three Patentee before: GUANGDONG YIZUMI PRECISION MACHINERY Co.,Ltd. |
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