CN102363344A - Leveling control method for four leveling cylinders of composite material product hydraulic machine - Google Patents
Leveling control method for four leveling cylinders of composite material product hydraulic machine Download PDFInfo
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- CN102363344A CN102363344A CN2011101828025A CN201110182802A CN102363344A CN 102363344 A CN102363344 A CN 102363344A CN 2011101828025 A CN2011101828025 A CN 2011101828025A CN 201110182802 A CN201110182802 A CN 201110182802A CN 102363344 A CN102363344 A CN 102363344A
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Abstract
The invention relates to a leveling control method for four leveling cylinders of a composite material product hydraulic machine, which comprises the following steps of: judging whether a slide block is in a position to be leveled or not; obtaining an average value of the positions of the four leveling cylinders; judging whether the actual positions of the leveling cylinders equal to the average value or not; controlling the opening degree of a servo valve through a proportion integration differentiation (PID) algorithm with the amplitude limit; judging whether the opening degree of the servo valve is smaller than the set lower limit value or not; judging whether the opening degree of the servo valve is greater than the set higher limit value or not; outputting the opening degree of the former control period by the servo valve when the actual positions of the leveling cylinders equal to the average value; outputting the lowest limit opening degree by the servo valve when the opening degree of the servo valve is smaller than the set lower limit value; outputting the highest limit opening degree by the servo valve when the opening degree of the servo valve is greater than the set higher limit value; outputting the servo valve opening degree of the PID algorithm with the amplitude limit when the opening degree of the servo valve is between the set lower limit value and the set higher limit value; and judging whether the pressurization pressure equals to the set pressure or not. The precise thickness control of surface mount component (SMC) workpeices is realized through regulating the opening degree of the servo valve of the leveling cylinders via the position PID algorithm with the amplitude limit.
Description
Technical field
The present invention relates to a kind of 24MN fiberglass numerically controlled hydraulic press, particularly relate to a kind of can the adaptation have relatively high expectations four leveling cylinders of composite product hydraulic press leveling control method of occasion of spun work thickness and precision.
Background technology
Increasingly extensive along with the glass-reinforced plastic material range of application, in the particularly extensive use of high-grade vapour of automobile industry, therefore high-end mold pressing SMC hydraulic press equipment also is developed thereupon.But the thickness requirement to workpiece in high-end SMC workpiece low speed pressing process is very high, and conventional glass molten steel pressing system can't satisfy existing working condition requirement, so developed the servo passive leveling SMC hydraulic system of accumulator control.
Principle based on the servo passive leveling system of accumulator is: four 100 tons piston leveling cylinder is fixed on four jiaos of the sills; Installation site checkout gear on each leveling cylinder; In the pressing process of SMC compacting; Touch the leveling cylinder after the slide block deceleration is descending,, control four the servo valve apertures (the connection aperture of leveling cylinder and accumulator) that are positioned at sill respectively through the leveling controller through detecting the feedback position of four leveling cylinders; The servo valve aperture size of four leveling cylinders of leveling controller control guarantees that slide block is parallel descending.To the leveling of slide block, passive leveling mode has the advantage that leveling moment is big, the anti-bias load ability is strong in the workpiece pressing process in completion.
Summary of the invention
Technical problem to be solved by this invention is; Provide a kind of in SMC workpiece pressing process; Regulate leveling cylinder servo valve aperture through the position pid algorithm of band amplitude limit, realize accurately four leveling cylinders of composite product hydraulic press leveling control method of compacting of thickness of workpiece.
The technical scheme that the present invention adopted is: four leveling cylinders of a kind of composite product hydraulic press leveling control method; In the process that slide block descends when hydraulic press is worked, include as follows the servo valve that is arranged on the leveling cylinder adopted the control step of being with the amplitude limit pid algorithm:
1) at first judging the position that whether slide block is in needs adjustment flat, is to get into next step, otherwise proceeds to judge;
2) obtain the mean value of four leveling cylinder positions;
3) judge whether leveling cylinder physical location equals mean value, is then to get into the 7th step, otherwise get into the 4th step;
4) the pid algorithm control servo valve aperture of band amplitude limit;
5) judge that the servo valve aperture whether less than the lower limit of setting, is then to get into the 7th step, otherwise gets into the 6th step;
6) judge that the servo valve aperture whether greater than the higher limit of setting, is then to get into the 7th step, otherwise also gets into the 7th step;
7) when leveling cylinder physical location equaled mean value, servo valve was exported the aperture of a control cycle; When servo valve aperture during less than the lower limit set, servo valve output minimum aperture; When servo valve aperture during greater than the higher limit set, the highest limit aperture of servo valve output; When between the higher limit of lower limit that the servo valve aperture is being set and setting, the servo valve aperture of amplitude limit pid algorithm is with in servo valve output;
8) judging the pressure whether moulding pressure equals to set, is that then leveling finishes, otherwise, return the mean value that the 2nd step continues to obtain four leveling cylinder positions.
The described minimum aperture of step 7 is-30%.
Step 7 the highest described limit aperture is+80%.
Four leveling cylinders of composite product hydraulic press of the present invention leveling control method; In SMC workpiece low speed pressing process, regulate leveling cylinder servo valve aperture (the connection aperture of leveling cylinder and accumulator) realization SMC thickness of workpiece through the position pid algorithm of band amplitude limit and accurately suppress.
Description of drawings
Fig. 1 is the flow chart of four leveling cylinders of composite product hydraulic press of the present invention leveling control method.
The specific embodiment
Provide specific embodiment below in conjunction with accompanying drawing, further specify composite product hydraulic press of the present invention four leveling cylinders leveling control method and how to realize.
Four leveling cylinders of composite product hydraulic press of the present invention leveling control method; Be in the process that slide block descends when hydraulic press is worked; Promptly in SMC workpiece low speed pressing process, regulate leveling cylinder servo valve aperture (the connection aperture of leveling cylinder and accumulator) realization SMC thickness of workpiece through the position pid algorithm of band amplitude limit and accurately suppress.Just in the pressing process of SMC workpiece compacting; Touch four 100 tons the piston leveling cylinder that is installed on the sill after the slide block deceleration is descending; Detect the feedback position of four leveling cylinders through installation site checkout gear on each leveling cylinder; Servo passive leveling system based on accumulator; Control the servo valve aperture size (the connection aperture of leveling cylinder and accumulator) of four leveling cylinders that are positioned at sill respectively through the leveling controller, accomplish in the workpiece pressing process the leveling of slide block, the assurance slide block is parallel descending.
As shown in Figure 1, four leveling cylinders of composite product hydraulic press of the present invention leveling control method is in the process that slide block descends when hydraulic press is worked, and the servo valve that includes being arranged on the leveling cylinder adopts the control step of being with the amplitude limit pid algorithm:
Include following control step
1) at first judging the position that whether slide block is in needs adjustment flat, is to get into next step, otherwise proceeds to judge;
2) obtain the mean value of four leveling cylinder positions;
3) judge whether leveling cylinder physical location equals mean value, is then to get into the 7th step, otherwise get into the 4th step;
4) band amplitude limit pid algorithm control servo valve aperture;
5) judge that the servo valve aperture whether less than the lower limit of setting, is then to get into the 7th step, otherwise gets into the 6th step;
6) judge that the servo valve aperture whether greater than the higher limit of setting, is then to get into the 7th step, otherwise also gets into the 7th step;
7) when leveling cylinder physical location equaled mean value, servo valve was exported the aperture of a control cycle; When servo valve aperture during less than the lower limit set, servo valve output minimum aperture, described minimum aperture is-30%; When servo valve aperture during greater than the higher limit set, the highest limit aperture of servo valve output, the highest described limit aperture is+80%; When between the higher limit of lower limit that the servo valve aperture is being set and setting, the servo valve aperture of amplitude limit pid algorithm is with in servo valve output;
8) judging the pressure whether moulding pressure equals to set, is then high reef knot bundle, otherwise, return the mean value that the 2nd step continues to obtain four leveling cylinder positions.
Claims (3)
1. four leveling cylinders of composite product hydraulic press leveling control method is characterized in that, in the process that slide block descends when hydraulic press is worked, includes as follows the servo valve that is arranged on the leveling cylinder is adopted the control step of being with the amplitude limit pid algorithm:
1) at first judging the position that whether slide block is in needs adjustment flat, is to get into next step, otherwise proceeds to judge;
2) obtain the mean value of four leveling cylinder positions;
3) judge whether leveling cylinder physical location equals mean value, is then to get into the 7th step, otherwise get into the 4th step;
4) the pid algorithm control servo valve aperture of band amplitude limit;
5) judge that the servo valve aperture whether less than the lower limit of setting, is then to get into the 7th step, otherwise gets into the 6th step;
6) judge that the servo valve aperture whether greater than the higher limit of setting, is then to get into the 7th step, otherwise also gets into the 7th step;
7) when leveling cylinder physical location equaled mean value, servo valve was exported the aperture of a control cycle; When servo valve aperture during less than the lower limit set, servo valve output minimum aperture; When servo valve aperture during greater than the higher limit set, the highest limit aperture of servo valve output; When between the higher limit of lower limit that the servo valve aperture is being set and setting, the servo valve aperture of amplitude limit pid algorithm is with in servo valve output;
8) judging the pressure whether moulding pressure equals to set, is that then leveling finishes, otherwise, return the mean value that the 2nd step continues to obtain four leveling cylinder positions.
2. four leveling cylinders of composite product hydraulic press according to claim 1 leveling control method, it is characterized in that: the described minimum aperture of step 7 is-30%.
3. four leveling cylinders of composite product hydraulic press according to claim 1 leveling control method, it is characterized in that: step 7 the highest described limit aperture is+80%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101828025A CN102363344A (en) | 2011-06-30 | 2011-06-30 | Leveling control method for four leveling cylinders of composite material product hydraulic machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101828025A CN102363344A (en) | 2011-06-30 | 2011-06-30 | Leveling control method for four leveling cylinders of composite material product hydraulic machine |
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| CN102363344A true CN102363344A (en) | 2012-02-29 |
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| CN2011101828025A Pending CN102363344A (en) | 2011-06-30 | 2011-06-30 | Leveling control method for four leveling cylinders of composite material product hydraulic machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103660359A (en) * | 2013-11-19 | 2014-03-26 | 浙江大学 | Hydraulic control system and method for passive type four-corner-leveling hydraulic press |
| CN109203556A (en) * | 2017-07-07 | 2019-01-15 | 博世力士乐（常州）有限公司 | The electro-hydraulic leveling system of the passive type of hydraulic press |
| CN109986828A (en) * | 2019-05-13 | 2019-07-09 | 福州大学 | A kind of composite material press four-corner leveling system for realizing gross tonnage control |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672311A (en) * | 2009-09-24 | 2010-03-17 | 中冶赛迪工程技术股份有限公司 | Multi-hydraulic cylinder synchronization control method |
-
2011
- 2011-06-30 CN CN2011101828025A patent/CN102363344A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672311A (en) * | 2009-09-24 | 2010-03-17 | 中冶赛迪工程技术股份有限公司 | Multi-hydraulic cylinder synchronization control method |
Non-Patent Citations (1)
| Title |
|---|
| 李颖宏，甘泉: "基于限幅的最优PID控制器", 《仪器仪表学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103660359A (en) * | 2013-11-19 | 2014-03-26 | 浙江大学 | Hydraulic control system and method for passive type four-corner-leveling hydraulic press |
| CN103660359B (en) * | 2013-11-19 | 2015-06-17 | 浙江大学 | Hydraulic control system and method for passive type four-corner-leveling hydraulic press |
| CN109203556A (en) * | 2017-07-07 | 2019-01-15 | 博世力士乐（常州）有限公司 | The electro-hydraulic leveling system of the passive type of hydraulic press |
| CN109986828A (en) * | 2019-05-13 | 2019-07-09 | 福州大学 | A kind of composite material press four-corner leveling system for realizing gross tonnage control |
| CN109986828B (en) * | 2019-05-13 | 2021-03-30 | 福州大学 | Composite press four-corner leveling system for realizing total tonnage control |
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Application publication date: 20120229 |