CN100436116C - Pressure monitord by displacement type method for controlling fluid form machine for powder - Google Patents
Pressure monitord by displacement type method for controlling fluid form machine for powder Download PDFInfo
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- CN100436116C CN100436116C CNB2006100370428A CN200610037042A CN100436116C CN 100436116 C CN100436116 C CN 100436116C CN B2006100370428 A CNB2006100370428 A CN B2006100370428A CN 200610037042 A CN200610037042 A CN 200610037042A CN 100436116 C CN100436116 C CN 100436116C
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Abstract
A pressure-type control method with shift monitor for the hydraulic forming machine using powder as raw material is disclosed. A shift sensor is used to monitor the relative shift between upper and lower moulds. The shift value is used as the feedback parameter of closed-loop hydraulic control system. When the relative shift value is correspondent with the predefined thickness variation of powder, it is determined that the powder has been pressed by a predefined pressure, so performing a closed-loop control.
Description
Technical field
The present invention relates to the powder hydraulic forming machine, particularly the compress control method of powder hydraulic forming machine.
Background technology
The major function of powder hydraulic forming machine is the powder in the mould to be pressed into the base substrate with definite shape and intensity with certain pressure.For example be applied in the ceramic brick press on the wall floor tile production line, with certain pressure the ceramic powder in the mould be pressed into adobe exactly.For the size of controlled pressure, present known powder hydraulic forming machine all is the feedback parameter of controlling as pressure closed loop with the master cylinder pressure that pressure sensor monitoring arrives.There are many shortcomings in this pressure control mode: 1, the pressure of hydraulic circuit disturbed and the factor that influences a lot, be difficult to guarantee the repeatable accuracy of each pressure process, for example the fluctuation of hydraulic power source output pressure will make master cylinder pressure produce fluctuation; 2, the response speed of Hydraulic Elements also can influence moulding pressure; 3, the be under pressure restriction of installation site of sensor, there are certain error in the measured value of pressure sensor and the actual pressure value of master cylinder, and this error has randomness, are difficult to control; 4, the corresponding relation between the actual pressure that is subjected to of master cylinder pressure and powder can be affected because of the factor of mechanical resistance, is example with the movable beam type ceramic brick press, if moving beam unbalance loading, mechanical resistance is increased, and the pressure that causes adobe to be subjected to reduces, and influences the green brick forming quality.Generally speaking, be the dynamic pressure that disturbed by multiple factor because pressure sensor records, so prior art is difficult to guarantee the repeatable accuracy of each pressure process.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, for the powder hydraulic forming machine provides a kind of displacement monitoring pressure type control method.
The present invention is achieved in that with closed loop hydraulic control system control powder hydraulic forming machine the powder applied pressure, especially, before formal compacting powder, try to achieve powder and in mould, be subjected to the expectation amounts of thickness variation that taken place after the predetermined pressure of hydraulic forming machine, when formally suppressing powder, utilize in the displacement transducer monitoring, the relative shift of bed die, with the feedback parameter of this displacement as closed loop hydraulic control system, when last, the relative shift of bed die is during corresponding to the expectation amounts of thickness variation of powder, promptly be defined as powder being pressurized to predetermined pressure, so far finish a closed-loop control.This shows that the present invention comes down to need only the accurately relative shift of the upper and lower mould of control with the feedback element of displacement transducer as pressure closed loop control, just can accurate controlled pressure.It doesn't matter because the accuracy of measurement of displacement transducer is with the pressure oscillation of master cylinder, the response speed of Hydraulic Elements and the size of mechanical resistance, is subjected to disturbing factor little, and the therefore repeatable accuracy height of pressure process has at every turn overcome the shortcoming of prior art.
Advantage of the present invention is: to pressure controlled repeatable accuracy height, can improve the quality stability of powder hydraulic forming machine compacted products greatly; Displacement transducer need not to be sealed in hydraulic system inside, the installation and maintenance of being more convenient for of specific pressure sensor; Hardware configuration to the powder hydraulic forming machine is changed little, easy to implement.
Description of drawings
Fig. 1 is to be example with the ceramic brick press, and the operation principle schematic diagram of the inventive method is described;
Fig. 2 is the control flow chart of Fig. 1;
Fig. 3 is the hardware configuration block diagram that is applicable to a kind of Programmable Logic Controller of the inventive method.
The specific embodiment
Fig. 1 is the fundamental diagram that the present invention is applied to the movable beam type ceramic brick press.The movable beam type ceramic brick press comprises a workbench 1 of fixing with frame, and the moving beam 2 that can move up and down.Moving beam 2 is actually a piston cylinder that can move up and down, and after injecting hydraulic oil in the cylinder, moving beam 2 moves downward.Moving beam 2 moves downward the pressure of compacting powder and is controlled by closed loop hydraulic control system.Upper and lower mould 3,4 is installed in respectively on moving beam 2 and the workbench 1.Be the relative shift of Measurement die 3,4, between moving beam 2 and workbench 1 raster pattern digital displacement sensor 5 be installed, the grating chi 5b that decides in the sensor is fixed on the frame, and moving grating chi 5a servo-actuated beam 2 moves together.Ceramic powder 6 fillings to be pressed are paved in bed die 4.Before formal compacting powder, try to achieve powder earlier and in bed die, be subjected to the expectation amounts of thickness variation X that taken place after the predetermined pressure of mold, when formally suppressing powder, utilize the relative shift of the upper and lower mould 3,4 of displacement transducer 5 monitorings, with the feedback parameter of this displacement as closed loop hydraulic control system.Just touching powder 6 with mold 3 is the starting point of displacement calculating amount, when the relative shift of upper and lower mould 3,4 equals the expectation amounts of thickness variation X of powder, promptly is defined as powder 6 being pressurized to predetermined pressure, so far finishes a closed-loop control.Above-mentioned closed-loop control process as shown in Figure 2.As shown in Figure 2, the present invention comes down to accurately to control the pressure of mould to powder with the feedback element of displacement transducer as closed loop hydraulic control system by the relative shift of controlling upper and lower mould.Need to prove that Fig. 2 has made slight variations in form, do not have directly powder to be estimated the set-point of amounts of thickness variation X, but input to Programmable Logic Controller as set-point with green brick forming thickness as Programmable Logic Controller (PLC).Because the filling thickness of powder in counterdie is as can be known, therefore given green brick forming thickness just equals given powder expectation amounts of thickness variation X, is the same in essence.After this changes, can allow the operator more directly perceived.
The expectation amounts of thickness variation X of powder can try to achieve by calculating: check in the compression ratio of each composition under predetermined pressure of powder earlier from technical manual, estimate amounts of thickness variation X according to the percentage and how much the calculating of powder total amount of each composition again.But as preferred forms, should try to achieve by following method: before formal compacting powder, same powder is suppressed test, test used powder hydraulic forming machine and mould, with used identical of formal compacting powder, process of the test adopts the pressure control mode of traditional direct monitoring master cylinder pressure, but slow down than traditional normal productive process pressing speed, prolong pressing time, when pressure sensor detect master cylinder pressure reach predetermined pressure and stable after, stop pressurization, the powder that the powder amounts of thickness variation that record this moment will set when promptly conduct will formally be suppressed powder is from now on estimated amounts of thickness variation X.Because pressing speed is slow, pressing time is longer, therefore can farthest reduce of the influence of various disturbing factors to pressure sensor, make the pressure that records near actual value, the powder that the powder amounts of thickness variation that obtains like this sets when just can be used as formal compacting powder is estimated amounts of thickness variation, estimate the pressure control feedback parameter of amounts of thickness variation with this powder conversely, just can improve pressure controlled repeatable accuracy greatly as closed loop hydraulic control system.
Compare with computational methods, test method has more general applicability, can be applicable to the powder that can't check in compression ratio by handbook, and the degree of accuracy is higher.After finishing single test, as long as the composition of powder and amount do not change, suppress in batches afterwards in the production process of powder and just can continue to use measured expectation amounts of thickness variation X always, if to the composition of powder and (or) amount adjusts, or changed predetermined pressure, only need do same test again and get final product.
In the process of asking for powder expectation amounts of thickness variation X with test method, used displacement transducer 5 removes to measure the relative shift of upper and lower mould 3,4 during the most handy formal compacting powder, so just needn't estimate that amounts of thickness variation is provided with a cover powder thickness measurement device specially for trying to achieve, save hardware cost, and help reducing systematic error, improve control accuracy.
For further simplifying this method, in powder being suppressed the process of test in the hope of powder expectation amounts of thickness variation X, when detecting master cylinder pressure and reach predetermined pressure, a single-point value that this moment records with displacement transducer is represented the expectation amounts of thickness variation X of powder; In the process of formal compacting powder, the value that records with displacement transducer is represented the relative shift of upper and lower mould, when the value that records estimated that with representative the single-point value of amounts of thickness variation X equates, the relative shift that promptly is defined as upper and lower mould was corresponding with the expectation amounts of thickness variation X of powder.This method for simplifying can be done clearer explanation with Fig. 1: in powder being suppressed the process of test in the hope of powder expectation amounts of thickness variation X, when detecting master cylinder pressure and reach predetermined pressure, suppose that mold 3 just moves to A point place height, so just a reading a who records with displacement transducer 5 this moment represents the expectation amounts of thickness variation X of powder; In the process of formal compacting powder, as long as the value that displacement transducer 5 records equals a, the relative shift that just can be defined as upper and lower mould is corresponding with the expectation amounts of thickness variation X of powder.After this simplifies, no longer need to measure the explicit value that powder is estimated amounts of thickness variation X, just do not need to measure the actual relative shift of upper and lower mould yet, thereby got around to accurately finding out the difficulty that bring position that mold 3 just touches with powder 6.
The inventive method can utilize conventional Programmable Logic Controller (being called for short PLC) to realize.Fig. 3 is exactly a kind of hardware configuration block diagram that is applicable to the Programmable Logic Controller of the inventive method.If the displacement transducer among the figure is removed, in fact Fig. 3 is exactly widely used closed loop hydraulic controller in the powder hydraulic forming machine.This controller is realized programming and human-computer dialogue by man-machine interface, by executive items such as magnetic valve, proportioning valve, servo valves hydraulic system is controlled.The effect of displacement transducer as described above among the figure.Among the figure pressure sensor only for show, with reference to the usefulness of contrast, and estimate to be used to monitor master cylinder pressure in the process of amounts of thickness variation asking for powder with test method, and the automated closed-loop that does not participate in pressure in formal production process is controlled.This shows, implement the inventive method and need not the hardware configuration of existing closed loop hydraulic control system is done big change, only need control program to be done corresponding the adjustment and get final product according to described method, easy to implement.
Claims (4)
1, a kind of displacement monitoring pressure type control method of powder hydraulic forming machine, control the powder hydraulic forming machine to the powder applied pressure with closed loop hydraulic control system, it is characterized in that: before formal compacting powder, try to achieve powder and in mould, be subjected to the expectation amounts of thickness variation that taken place after the predetermined pressure of hydraulic forming machine, when formally suppressing powder, utilize in the displacement transducer monitoring, the relative shift of bed die, with the feedback parameter of this displacement as closed loop hydraulic control system, when last, the relative shift of bed die is during corresponding to the expectation amounts of thickness variation of powder, promptly be defined as powder being pressurized to predetermined pressure, so far finish a closed-loop control.
2, displacement monitoring pressure type control method as claimed in claim 1, it is characterized in that: try to achieve described powder and estimate that the method for amounts of thickness variation is, before formal compacting powder, same powder is suppressed test, test used powder hydraulic forming machine and mould, with used identical of formal compacting powder, process of the test adopts the pressure control mode of traditional direct monitoring master cylinder pressure, but slow down than traditional normal productive process pressing speed, prolong pressing time, when pressure sensor detect master cylinder pressure reach predetermined pressure and stable after, stop pressurization, the powder that the powder amounts of thickness variation that record this moment will set when promptly conduct will formally be suppressed powder is from now on estimated amounts of thickness variation.
3, displacement monitoring pressure type control method as claimed in claim 2, it is characterized in that: in powder being suppressed the process of test in the hope of powder expectation amounts of thickness variation, used displacement transducer removes to measure the relative shift of upper and lower mould during the formal compacting of usefulness powder.
4, displacement monitoring pressure type control method as claimed in claim 3, it is characterized in that: in powder being suppressed the process of test in the hope of powder expectation amounts of thickness variation, when detecting master cylinder pressure and reach predetermined pressure, a single-point value that this moment records with displacement transducer is represented the expectation amounts of thickness variation of powder; In the process of formal compacting powder, the value that records with displacement transducer is represented the relative shift of upper and lower mould, when the value that records estimated that with representative the single-point value of amounts of thickness variation equates, the relative shift that promptly is defined as upper and lower mould was corresponding with the expectation amounts of thickness variation of powder.
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| CNB2006100370428A CN100436116C (en) | 2006-08-11 | 2006-08-11 | Pressure monitord by displacement type method for controlling fluid form machine for powder |
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| CNB2006100370428A CN100436116C (en) | 2006-08-11 | 2006-08-11 | Pressure monitord by displacement type method for controlling fluid form machine for powder |
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| CN100436116C true CN100436116C (en) | 2008-11-26 |
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| CN102806347B (en) * | 2012-07-13 | 2013-12-25 | 南通皋液液压机有限公司 | Full-automatic wet type magnetic material molding hydraulic machine |
| CN103722770A (en) * | 2013-12-20 | 2014-04-16 | 吴江市震宇缝制设备有限公司 | Powder press capable of preventing empty pressing of dies |
| CN104765381B (en) * | 2014-01-08 | 2017-09-29 | 佛山市恒力泰机械有限公司 | The dynamic beam of ceramic brick press originates the method for adjustment and system of pressing position |
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| CN104760328B (en) * | 2014-01-08 | 2017-01-04 | 佛山市恒力泰机械有限公司 | Linear displacement sensor installation evaluation method and system |
| CN104977954B (en) * | 2014-04-09 | 2017-07-28 | 佛山市恒力泰机械有限公司 | A kind of ceramic brick press velocity location double-closed-loop control method |
| CN105946105B (en) * | 2016-07-07 | 2018-09-04 | 佛山市恒力泰机械有限公司 | A kind of ceramic brick press mold bottom level detecting apparatus and method |
| CN108437509A (en) * | 2018-04-09 | 2018-08-24 | 青岛元汇丰企业管理咨询服务有限公司 | A kind of energy-saving and noise-reducing forcing press |
| CN112524121B (en) * | 2019-09-18 | 2022-09-23 | 上海禾之木工业设备有限公司 | On-line monitoring system based on servo hydraulic system |
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Address after: 528137 No. 25 (C), science and Technology Industrial Zone, Sanshui center, Foshan, Guangdong, China (F4) Patentee after: FOSHAN HENGLITAI MACHINERY Co.,Ltd. Address before: 528000 No. two, No. 12, Shiwan Town, Guangdong, Foshan Patentee before: FOSHAN HENGLITAI MACHINERY Co.,Ltd. |
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