CN103341781B - Hydrostatic bearing oil film thickness controlling system - Google Patents
Hydrostatic bearing oil film thickness controlling system Download PDFInfo
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- CN103341781B CN103341781B CN201310279414.8A CN201310279414A CN103341781B CN 103341781 B CN103341781 B CN 103341781B CN 201310279414 A CN201310279414 A CN 201310279414A CN 103341781 B CN103341781 B CN 103341781B
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Abstract
Hydrostatic bearing oil film thickness controlling system, relates to fluid pressure support technology and rotating speed volume compound regulation technology, is specifically related to a kind of hydrostatic bearing oil film thickness controlling system.In order to the oil film thickness solving traditional liquid hydrostatic bearing is uncontrollable, lathe load or operating mode is interfered or human factor and when changing, the oil film thickness of hydrostatic bearing is unstable, affect the problem of machining accuracy and working (machining) efficiency, after the present invention is processed actual oil film thickness signal by DSP Signal sampling and processing controller, again with receive give fixed oil film thickness signal ask deviation, finally output control signals to machine tool numerical control system, the speed controling signal of output and displacement control signal are given frequency converter and servo variable pump by machine tool numerical control system respectively, regulate the high efficiency fast-response realizing oil supply system output flow to control by rotating speed and the two of discharge capacity, finally reach hydrostatic bearing oil film thickness object, the present invention is applicable on the vertical lathe of hydrostatic bearing.
Description
Technical field
The present invention relates to fluid pressure support technology and rotating speed volume compound regulation technology, be specifically related to a kind of hydrostatic bearing oil film thickness controlling system.
Background technology
Hydrodynamic journal liquid polymers are as the axial support of worktable rotary, hydraulic oil is forced to send into the oil pocket between workbench and base by oil supply system, the gap that oil pocket sealing oil edge and floral disc are formed produces throttling action, thus make fluid have bearing capacity, workbench is floated, between workbench and base, forms oil film.When thickness is excessive, the oil film rigidity of hydrostatic bearing is low, poor stability, and machining accuracy is restricted and the work of oil supply system high load capacity, and greatly, working life is short for energy consumption and power loss; When oil film thickness is crossed thin, workbench easily produces dry friction, has the danger of grinding wound.Traditional liquid hydrostatic bearing, oil film thickness is uncontrollable, and when load or working conditions change, oil film thickness is unstable, affects machining accuracy and working (machining) efficiency.
Summary of the invention
The present invention is that the oil film thickness in order to solve traditional liquid hydrostatic bearing is uncontrollable, lathe load or operating mode is interfered or human factor and when changing, the oil film thickness of hydrostatic bearing is unstable, affect the problem of machining accuracy and working (machining) efficiency, the invention provides a kind of hydrostatic bearing oil film thickness controlling system.
Hydrostatic bearing oil film thickness controlling system, it comprises DSP Signal sampling and processing controller, machine tool numerical control system, oil supply system, hydrostatic bearing and current vortex sensor; Described oil supply system comprises servo variable pump and buncher unit, and described buncher unit comprises alternating current generator and frequency converter; the speed controling signal output of described machine tool numerical control system is connected with the signal input part of frequency converter, the signal output part of described frequency converter is connected with the control signal input of alternating current generator, described alternating current generator is for driving servo variable displacement pump work, the displacement control signal input part of described servo variable pump is connected with the displacement control signal output part of machine tool numerical control system, the oil that described servo variable pump exports is for controlling the lifting of hydrostatic bearing, described current vortex sensor is for gathering the oil film thickness signal of hydrostatic bearing, the oil film thickness signal output part of described current vortex sensor is connected with the actual oil film thickness signal input part of DSP Signal sampling and processing controller, the control signal output of described DSP Signal sampling and processing controller is connected with the control signal input of machine tool numerical control system by Ethernet, being connected with the fixed oil film thickness signal input part of giving of DSP Signal sampling and processing controller by Ethernet to fixed oil film thickness signal output part of described machine tool numerical control system.
Hydrostatic bearing oil film thickness controlling system of the present invention improves oil film thickness signal quality by the signal transacting of DSP Signal sampling and processing controller to actual oil film thickness, makes it can be used as controlled device and can realize effective observation; Realize high efficiency fast-response Flow-rate adjustment by servo variable displacement pump frequency converting speed regulating, finally realize the controlled of hydrostatic bearing oil film thickness.
The beneficial effect that the present invention brings is, it is controlled that hydrostatic bearing oil film thickness controlling system of the present invention makes the oil film thickness of hydrodynamic journal liquid polymers realize, when the load of lathe or operating mode receive interference or human factor and change, the oil film thickness of its hydrostatic bearing can remain unchanged, thus ensure that machining accuracy and efficiency; Machining accuracy and working (machining) efficiency is made to improve 10% and 20% respectively, added benefit can be produced simultaneously, high-quality oil film thickness signal is obtained by DSP Signal sampling and processing controller, effectively observation in real time can be realized, ethernet communication is used between DSP Signal sampling and processing controller and machine tool numerical control system, improve modularization and versatility, flexibly and easily.
Accompanying drawing explanation
Fig. 1 is the electronic schematic diagram of hydrostatic bearing oil film thickness controlling system of the present invention.
Fig. 2 is the electronic schematic diagram of the DSP Signal sampling and processing controller described in detailed description of the invention two.
Detailed description of the invention
Detailed description of the invention one: present embodiment is described see Fig. 1, hydrostatic bearing oil film thickness controlling system described in present embodiment, it comprises DSP Signal sampling and processing controller 1, machine tool numerical control system 2, oil supply system, hydrostatic bearing 6 and current vortex sensor 7; Described oil supply system comprises servo variable pump 5 and buncher unit, and described buncher unit comprises alternating current generator 4 and frequency converter 3; the speed controling signal output of described machine tool numerical control system 2 is connected with the signal input part of frequency converter 3, the signal output part of described frequency converter 3 is connected with the control signal input of alternating current generator 4, described alternating current generator 4 works for driving servo variable pump 5, the displacement control signal input part of described servo variable pump 5 is connected with the displacement control signal output part of machine tool numerical control system 2, the oil that described servo variable pump 5 exports is for controlling the lifting of hydrostatic bearing 6, described current vortex sensor 7 is for gathering the oil film thickness signal of hydrostatic bearing 6, the oil film thickness signal output part of described current vortex sensor 7 is connected with the actual oil film thickness signal input part of DSP Signal sampling and processing controller 1, the control signal output of described DSP Signal sampling and processing controller 1 is connected with the control signal input of machine tool numerical control system 2 by Ethernet, being connected with the fixed oil film thickness signal input part of giving of DSP Signal sampling and processing controller 1 by Ethernet to fixed oil film thickness signal output part of described machine tool numerical control system 2.
Detailed description of the invention two: present embodiment is described see Fig. 1 and 2, the difference of present embodiment and the hydrostatic bearing oil film thickness controlling system described in detailed description of the invention one is, described DSP Signal sampling and processing controller 1 comprises frequency overlapped-resistable filter 8, differential amplifying device 9, A/D converter 10, digital filtering algorithm module 11, D/A converter 12, comparator 13 and control module 14; the signal input part of described frequency overlapped-resistable filter 8 is connected with the oil film thickness signal output part of current vortex sensor 7, the signal input part of described frequency overlapped-resistable filter 8 is the actual oil film thickness signal input part of DSP Signal sampling and processing controller 1, the signal output part of described frequency overlapped-resistable filter 8 is connected with the signal input part of differential amplifying device 9, the signal output part of described differential amplifying device 9 is connected with the input end of analog signal of A/D converter 10, the digital signal output end of described A/D converter 10 is connected with the filtering signal input of digital filtering algorithm module 11, the filtering signal output of described digital filtering algorithm module 11 is connected with the first signal input part of comparator 13, the secondary signal input of described comparator 13 is connected with the fixed oil film thickness signal output part of giving of machine tool numerical control system 2, the comparison signal output of described comparator 13 is connected with the signal input part of control module 14, the signal output part of described control module 14 is connected with the digital signal input end of D/A converter 12, the analog signal output of described D/A converter 12 is connected with the control signal input of machine tool numerical control system 2, the analog signal output of described D/A converter 12 is the control signal output of DSP Signal sampling and processing controller 1, the secondary signal input of described comparator 13 be DSP Signal sampling and processing controller 1 to fixed oil film thickness signal input part.
In present embodiment, the oil film thickness signal quality that current vortex sensor 7 exports is poor, cannot truly reflect actual oil film thickness, effective observation of feedback signal and oil film state can not be used as, therefore, mainly through using DSP Signal sampling and processing controller 1, the actual oil film thickness signal received is processed, what the oil film thickness signal after process and DSP Signal sampling and processing controller 1 are received asks deviation to fixed oil film thickness signal simultaneously, last DSP Signal sampling and processing controller 1 exports control signal and controls machine tool numerical control system 2, Signal transmissions between DSP Signal sampling and processing controller 1 and machine tool numerical control system 2 is realized by Ethernet, machine tool numerical control system 2 output speed control signal is to frequency converter 3, and this machine tool numerical control system 2 exports displacement control signal to servo variable pump 5, regulate the high efficiency fast-response realizing oil supply system output flow to control by rotating speed and the two of discharge capacity, finally reach hydrostatic bearing oil film thickness object.
Described digital filtering algorithm module 11 can adopt existing techniques in realizing, such as, adopt the methods such as Butterworth digital filtering.
Described control module 14 is prior art, such as, adopt the control strategies such as traditional PID control, fuzzy control or robust control.
Detailed description of the invention three: present embodiment is described see Fig. 1 and 2, the difference of present embodiment and the hydrostatic bearing oil film thickness controlling system described in detailed description of the invention one or two is, described DSP Signal sampling and processing controller 1 adopts chip TMS320F28335 to realize.
Detailed description of the invention four: present embodiment is described see Fig. 1 and 2, the difference of present embodiment and the hydrostatic bearing oil film thickness controlling system described in detailed description of the invention one or two is, described A/D converter 10 adopts chip AD7609 to realize.
Detailed description of the invention five: present embodiment is described see Fig. 1 and 2, the difference of present embodiment and the hydrostatic bearing oil film thickness controlling system described in detailed description of the invention one or two is, described D/A converter 12 adopts chip AD5754R to realize.
Detailed description of the invention six: present embodiment is described see Fig. 1 and 2, the difference of present embodiment and the hydrostatic bearing oil film thickness controlling system described in detailed description of the invention two is, described frequency overlapped-resistable filter 8 is active anti-aliasing filter.
Claims (6)
1. hydrostatic bearing oil film thickness controlling system, it is characterized in that, it comprises DSP Signal sampling and processing controller (1), machine tool numerical control system (2), oil supply system, hydrostatic bearing (6) and current vortex sensor (7); Described oil supply system comprises servo variable pump (5) and buncher unit, and described buncher unit comprises alternating current generator (4) and frequency converter (3); the speed controling signal output of described machine tool numerical control system (2) is connected with the signal input part of frequency converter (3), the signal output part of described frequency converter (3) is connected with the control signal input of alternating current generator (4), described alternating current generator (4) works for driving servo variable pump (5), the displacement control signal input part of described servo variable pump (5) is connected with the displacement control signal output part of machine tool numerical control system (2), the oil that described servo variable pump (5) exports is for controlling the lifting of hydrostatic bearing (6), described current vortex sensor (7) is for gathering the oil film thickness signal of hydrostatic bearing (6), the oil film thickness signal output part of described current vortex sensor (7) is connected with the actual oil film thickness signal input part of DSP Signal sampling and processing controller (1), the control signal output of described DSP Signal sampling and processing controller (1) is connected by the control signal input of Ethernet with machine tool numerical control system (2), being connected with the fixed oil film thickness signal input part of giving of DSP Signal sampling and processing controller (1) by Ethernet to fixed oil film thickness signal output part of described machine tool numerical control system (2).
2. hydrostatic bearing oil film thickness controlling system according to claim 1, it is characterized in that, described DSP Signal sampling and processing controller (1) comprises frequency overlapped-resistable filter (8), differential amplifying device (9), A/D converter (10), digital filtering algorithm module (11), D/A converter (12), comparator (13) and control module (14);
The signal input part of described frequency overlapped-resistable filter (8) is connected with the oil film thickness signal output part of current vortex sensor (7), the signal input part of described frequency overlapped-resistable filter (8) is the actual oil film thickness signal input part of DSP Signal sampling and processing controller (1), the signal output part of described frequency overlapped-resistable filter (8) is connected with the signal input part of differential amplifying device (9), the signal output part of described differential amplifying device (9) is connected with the input end of analog signal of A/D converter (10), the digital signal output end of described A/D converter (10) is connected with the filtering signal input of digital filtering algorithm module (11), the filtering signal output of described digital filtering algorithm module (11) is connected with the first signal input part of comparator (13), the secondary signal input of described comparator (13) is connected with the fixed oil film thickness signal output part of giving of machine tool numerical control system (2), the comparison signal output of described comparator (13) is connected with the signal input part of control module (14), the signal output part of described control module (14) is connected with the digital signal input end of D/A converter (12), the analog signal output of described D/A converter (12) is connected with the control signal input of machine tool numerical control system (2), the analog signal output of described D/A converter (12) is the control signal output of DSP Signal sampling and processing controller (1), the secondary signal input of described comparator (13) be DSP Signal sampling and processing controller (1) to fixed oil film thickness signal input part.
3. hydrostatic bearing oil film thickness controlling system according to claim 1 and 2, is characterized in that, described DSP Signal sampling and processing controller (1) adopts chip TMS320F28335 to realize.
4. hydrostatic bearing oil film thickness controlling system according to claim 2, is characterized in that, described A/D converter (10) adopts chip AD7609 to realize.
5. hydrostatic bearing oil film thickness controlling system according to claim 2, is characterized in that, described D/A converter (12) adopts chip AD5754R to realize.
6. hydrostatic bearing oil film thickness controlling system according to claim 2, is characterized in that, described frequency overlapped-resistable filter (8) is active anti-aliasing filter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3191269B1 (en) * | 2014-09-10 | 2018-07-11 | FOSBER S.p.A. | Device for transverse cutting of a web material and machine containing said device |
| CN105690111A (en) * | 2016-04-08 | 2016-06-22 | 宜昌长机科技有限责任公司 | Self-adaptive static-pressure adjustment supporting device for large rotary workbench and oil film thickness control system and method |
| CN105710661B (en) * | 2016-04-22 | 2018-06-29 | 湖北工业大学 | A kind of static pressure workbench oil film thickness adjusting method |
| CN106094736A (en) * | 2016-08-31 | 2016-11-09 | 威海华东数控股份有限公司 | Numerical control vertical lathe turntable oil film thickness method |
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