CN205085735U - Fluid pressure guide rail film thickness control system - Google Patents
Fluid pressure guide rail film thickness control system Download PDFInfo
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- CN205085735U CN205085735U CN201520860249.XU CN201520860249U CN205085735U CN 205085735 U CN205085735 U CN 205085735U CN 201520860249 U CN201520860249 U CN 201520860249U CN 205085735 U CN205085735 U CN 205085735U
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- guide rail
- film thickness
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- controller
- hydraulic proportional
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Abstract
The utility model discloses a fluid pressure guide rail film thickness control system, including electro -hydraulic proportional choke valve, guide rail, slip table, displacement sensor, adc, controller, control computer and digital analog converter, displacement sensor arranges the inboard of slip table in, displacement sensor connects adc, adc connection director, the controller passes through digital analog converter and is connected with the electro -hydraulic proportional choke valve, the electro -hydraulic proportional choke valve is connected with the oil inlet of slip table, control computer is connected with the controller, still install the 2nd displacement sensor on the four corners of guide rail, choose the electro -hydraulic proportional choke valve for use, displacement sensor, the controller carries out closed -loop control to film thickness, realizes the invariable effect of fluid pressure guide rail film thickness to use to calculate and control and show the parameter, the 2nd displacement sensor detects the displacement volume of guide rail, to the comparison of four displacement volumes, can compensate because the guide rail levelness that outer load off -centre causes is overproof.
Description
Technical field
The utility model relates to the fields such as hydrostatic slideway technology, specifically, is a kind of Oil Film Thickness for Hydrostatic Slide control system.
Background technology
Hydrostatic slideway is the hydraulic oil being filled with certain pressure between guide rail and slide unit, make to be separated by oil film between the kinematic pair of guide rail, reduce the impact because of guide rail surface mismachining tolerance, make guide rail can obtain very high kinematic accuracy, simultaneously, the existence of fluid friction makes guide rail can without the work of wearing and tearing under very wide velocity interval and load-up condition, due to the existence of oil film, guide rail also has good absorbing and lubricity, and it is reliable to have stable working, life-span is high, the advantage such as the change of the movement velocity impact on oil film thickness and rigidity is little, high accuracy can be met, the requirement of heavy load and various velocity interval lathe, being widely used in all kinds of lathe.
Hydrostatic slideway oil supply system output pressure is P
spressure oil, after fixed restriction device, pressure reduces to P
r, enter guide rail oil pocket, oil pocket pressure is P
d.When oil pocket pressure P
dwhen being greater than outer load with the product of oil pocket area A, slide unit levitation height is h
0, namely oil film thickness is h
0, in oil pocket, pressure oil is outwards overflowed by gap, the pressure oil after spilling and atmosphere, and pressure is zero.Along with the increase of outer load, oil pocket pressure P
dincrease, again reach balance with outer load.Theoretical according to liquid resistance, if the resistance of hydrostatic slideway oil supply system fixed restriction device liquid is R
1, the resistance of slide unit sealing oil edge liquid is R (h), has liquid to hinder formula:
arrange:
known, when oil pocket pressure P
dincrease, system output pressure is P
s, the resistance of fixed restriction device liquid is for R
1under constant prerequisite, only have the resistance of reduction slide unit sealing oil edge liquid to be R (h), namely reduce oil film thickness.And oil film thickness change, not only can affect the rigidity of guide rail self, and kinematic accuracy, the positioning precision to guide rail, and the machining accuracy of workpiece has considerable influence.Therefore, be necessary to take necessary measure, the change of load outside makes the constant of maintenance oil film thickness, to guarantee the performance of guide track system, and the final processing characteristics ensureing lathe.
Utility model content
The purpose of this utility model is to design a kind of Oil Film Thickness for Hydrostatic Slide control system, select electro-hydraulic proportional throttle valve, displacement transducer, controller carries out closed-loop control to oil film thickness, realize the effect that Oil Film Thickness for Hydrostatic Slide is constant, and computation carries out controlling and shows to parameter.
The utility model is achieved through the following technical solutions: a kind of Oil Film Thickness for Hydrostatic Slide control system, comprise electro-hydraulic proportional throttle valve, guide rail, slide unit, displacement transducer, analog-digital converter, controller, computer for controlling and digital to analog converter, institute's displacement sensors is placed in the inner side of slide unit, institute's displacement sensors connection mode number converter, described analog-digital converter connection control device, described controller is connected with electro-hydraulic proportional throttle valve by digital to analog converter, and described electro-hydraulic proportional throttle valve is connected with the oil-in of slide unit; Described computer for controlling is connected with controller.
Further to better implement the present invention, the hydraulic oil of certain pressure can be filled with between slide unit and guide rail, make to be separated by oil film between the kinematic pair of guide rail, be arranged to following structure especially: described slide unit is placed on guide rail.
Further for better to realize the utility model, by the comparison to four displacements, the guide rail levelness caused because outer load is eccentric can be compensated overproof, be arranged to following structure especially: on the corner of described guide rail, also second displacement sensor is installed.
Further for better to realize the utility model, the following set-up mode of special employing: institute's displacement sensors adopts non-contact displacement transducer.
The utility model compared with prior art, has the following advantages and beneficial effect:
The utility model selects electro-hydraulic proportional throttle valve, displacement transducer, and controller carries out closed-loop control to oil film thickness, realizes the effect that Oil Film Thickness for Hydrostatic Slide is constant, and computation carries out controlling to parameter and shows.
The utility model can utilize the displacement of 4 second displacement sensors to guide rail being positioned at guide rail corner to detect, and by the comparison to four displacements, can compensate the guide rail levelness caused because outer load is eccentric overproof.
The utility model is provided with non-contact displacement transducer inside slide unit, in order to detect the floatation volume of slide unit, and the oil film thickness numerical value detected is returned controller, in controller, detected value and setting value are compared, when the two is equal, system keeps present situation; When the two is unequal, controller output signal, controls electro-hydraulic proportional throttle valve valve port opening, regulates valve port flow and outlet pressure, thus regulates slide unit oil pocket pressure, changes the floatation volume of slide unit, until oil film thickness conforms to setting value.
Accompanying drawing explanation
Fig. 1 is the utility model structure chart.
Wherein, 1-electro-hydraulic proportional throttle valve, 2-guide rail, 3-slide unit, 4-displacement transducer, 5-analog-digital converter, 6-controller, 7-computer for controlling, 8-digital to analog converter, 9-second displacement sensor.
Detailed description of the invention
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
Embodiment 1:
A kind of Oil Film Thickness for Hydrostatic Slide control system, select electro-hydraulic proportional throttle valve, displacement transducer, controller carries out closed-loop control to oil film thickness, realize the effect that Oil Film Thickness for Hydrostatic Slide is constant, and computation carries out controlling to parameter and shows, as shown in Figure 1, be arranged to following structure especially: comprise electro-hydraulic proportional throttle valve 1, guide rail 2, slide unit 3, displacement transducer 4, analog-digital converter 5, controller 6, computer for controlling 7 and digital to analog converter 8, institute's displacement sensors 4 is placed in the inner side of slide unit 3, institute's displacement sensors 4 connection mode number converter 5, described analog-digital converter 5 connection control device, described controller is connected with electro-hydraulic proportional throttle valve 1 by digital to analog converter 8, described electro-hydraulic proportional throttle valve 1 is connected with the oil-in of slide unit 3, described computer for controlling 7 is connected with controller 6.
Embodiment 2:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, the hydraulic oil of certain pressure can be filled with between slide unit and guide rail, make to be separated by oil film between the kinematic pair of guide rail, as shown in Figure 1, following structure is arranged to especially: described slide unit 3 is placed on guide rail 2.
Embodiment 3:
The present embodiment is at the enterprising one-step optimization in the basis of above-mentioned any embodiment, further for better to realize the utility model, by the comparison to four displacements, the guide rail levelness caused because outer load is eccentric can be compensated overproof, as shown in Figure 1, following structure is arranged to especially: on the corner of described guide rail 2, second displacement sensor 9 is also installed.Second displacement sensor 9 is arranged on the corner of guide rail 2, namely four second displacement sensors 9 are installed on guide rail 2 altogether, 4 displacement signals exported by four second displacement sensors 9, the levelness situation of guide level can be judged, the pressure oil being controlled corresponding oil pocket by computer for controlling 7 exports, the hydraulic fluid pressure exported is directly proportional to guide rail displacement, pressure increment is large, and then guide rail floatation volume is large, pressure increment little then guide rail floatation volume is little, keeps level and constant oil film thickness under the load effect outside of final guarantee guide rail.
Embodiment 4:
The present embodiment is at the enterprising one-step optimization in the basis of above-mentioned any embodiment, further for better to realize the utility model, and the following set-up mode of special employing: institute's displacement sensors 4 adopts non-contact displacement transducer.
Slide unit is provided with displacement transducer 4, can Real-Time Monitoring oil film thickness.When oil supply system does not work, hydrostatic slideway remains static, and slide unit 3 contacts with guide rail 2, and oil film thickness is zero.When after the work of hydrostatic slideway oil supply system, slide unit oil pocket is filled with a certain amount of pressure oil, and slide unit 3 floats, and the oil film thickness now between slide unit 3 and guide rail 2 is h
0, h
0be the optimum oil film thickness of the hydrostatic slideway drawn by designing and calculating, now guide rail has best rigidity, damping, and oil film thickness when making lathe have a best machining accuracy, optimum oil film thickness h
0pre-enter in computer for controlling 7 as controling parameters, and be stored in controller 6.When outer load increases, slide unit 3 declines Δ h, and oil film thickness becomes h
0-Δ h, displacement transducer 4 is transferred to controller 6 by monitoring the displacement signal obtained, monitor value and the optimum oil film thickness pre-entered compare by controller 6, the control signal controlling electro-hydraulic proportional throttle valve 1 is exported according to the two difference, increase the valve port opening of electro-hydraulic proportional throttle valve 1, reduce the import and export pressure drop of electro-hydraulic proportional throttle valve 1, increase the outlet pressure of electro-hydraulic proportional throttle valve 1, and then increase slide unit 3 oil pocket pressure, slide unit 3 is floated, oil film thickness increases, until oil clearance returns to optimum oil film thickness h
0.Otherwise, when outer load reduces, when slide unit 3 floats, then controller 6 outputs signal, and reduces the valve port opening of electro-hydraulic proportional throttle valve 1, increase the import and export pressure drop of electro-hydraulic proportional throttle valve 1, reduce the outlet pressure of electro-hydraulic proportional throttle valve 1, and then reduce slide unit 3 oil pocket pressure, slide unit is declined, oil film thickness reduces, until recover optimum oil film thickness h
0.
Concrete, displacement transducer 4 converts the shift transformation situation of guide rail to continuous print curtage signal, through analog-digital converter 5 by continuous print curtage signal, converts the data signal that can be processed by controller 6 to.The signal that the data signal that computer for controlling 7 sends is passed back by controller 6 and displacement transducer 4 compares, comparative quantity passes through digital to analog converter 8 as negative feedback control, data signal is converted to the acceptable continuous signal of electro-hydraulic proportional throttle valve 1, the opening degree of electro-hydraulic proportional throttle valve 1 is controlled, to control its outlet pressure.The above; it is only preferred embodiment of the present utility model; not do any pro forma restriction to the utility model, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present utility model, all falls within protection domain of the present utility model.
Claims (5)
1. an Oil Film Thickness for Hydrostatic Slide control system, comprise electro-hydraulic proportional throttle valve (1), guide rail (2), slide unit (3), displacement transducer (4), analog-digital converter (5), controller (6), computer for controlling (7) and digital to analog converter (8), it is characterized in that: institute's displacement sensors (4) is placed in the inner side of slide unit (3), institute's displacement sensors (4) connection mode number converter (5), described analog-digital converter (5) connection control device, described controller is connected with electro-hydraulic proportional throttle valve (1) by digital to analog converter (8), described electro-hydraulic proportional throttle valve (1) is connected with the oil-in of slide unit (3), described computer for controlling (7) is connected with controller (6).
2. a kind of Oil Film Thickness for Hydrostatic Slide control system according to claim 1, is characterized in that: described slide unit (3) is placed on guide rail (2).
3. a kind of Oil Film Thickness for Hydrostatic Slide control system according to claim 1 and 2, is characterized in that: on the corner of described guide rail (2), be also provided with second displacement sensor (9).
4. a kind of Oil Film Thickness for Hydrostatic Slide control system according to claim 3, is characterized in that: institute's displacement sensors (4) adopts non-contact displacement transducer.
5. a kind of Oil Film Thickness for Hydrostatic Slide control system according to claim 1 and 2, is characterized in that: institute's displacement sensors (4) adopts non-contact displacement transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520860249.XU CN205085735U (en) | 2015-10-30 | 2015-10-30 | Fluid pressure guide rail film thickness control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520860249.XU CN205085735U (en) | 2015-10-30 | 2015-10-30 | Fluid pressure guide rail film thickness control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205085735U true CN205085735U (en) | 2016-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520860249.XU Expired - Fee Related CN205085735U (en) | 2015-10-30 | 2015-10-30 | Fluid pressure guide rail film thickness control system |
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| CN (1) | CN205085735U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI635925B (en) * | 2017-11-16 | 2018-09-21 | 國立勤益科技大學 | Oil film detecting device of processing machine feed system |
| CN110261126A (en) * | 2019-06-24 | 2019-09-20 | 中国航发动力股份有限公司 | A kind of gas turbine squeeze film damper gap loads measuring device |
| CN111692257A (en) * | 2020-06-17 | 2020-09-22 | 华中科技大学 | Extrusion film type self-tuning vibration absorber |
-
2015
- 2015-10-30 CN CN201520860249.XU patent/CN205085735U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI635925B (en) * | 2017-11-16 | 2018-09-21 | 國立勤益科技大學 | Oil film detecting device of processing machine feed system |
| CN110261126A (en) * | 2019-06-24 | 2019-09-20 | 中国航发动力股份有限公司 | A kind of gas turbine squeeze film damper gap loads measuring device |
| CN111692257A (en) * | 2020-06-17 | 2020-09-22 | 华中科技大学 | Extrusion film type self-tuning vibration absorber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160316 Termination date: 20211030 |