CN102009353B - Variable constant-current static pressure guide rail and control method - Google Patents
Variable constant-current static pressure guide rail and control method Download PDFInfo
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- CN102009353B CN102009353B CN2010105122596A CN201010512259A CN102009353B CN 102009353 B CN102009353 B CN 102009353B CN 2010105122596 A CN2010105122596 A CN 2010105122596A CN 201010512259 A CN201010512259 A CN 201010512259A CN 102009353 B CN102009353 B CN 102009353B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention belongs to a numerically controlled rotary workbench, and relates to a variable constant-current static pressure guide rail and a control method thereof, in particular to a static pressure guide rail with large bearing capacity change range and small static pressure buoyancy change. The static pressure guide rail mainly comprises a static pressure mechanism, an oil passage monitoring system and an oil passage control system. The static pressure mechanism comprises a static pressure guide rail, a constant-current oil supply device and the like and plays a role of the constant-current static pressure guide rail; the oil passage monitoring system comprises a pressure sensor and a flow sensor and plays a role in monitoring the pressure and flow of a static pressure cavity; the oil passage control system mainly comprises a variable frequency motor, a programmable logic controller (PLC) and the like; and signals fed back by the oil passage monitoring system are processed, and the start of the variable frequency motor and the rotational speed are controlled through the PLC so as to fulfill the purposes of controlling the flow of the static pressure guide rail and balancing the buoyancy of the static pressure guide rail.
Description
Affiliated field:
The present invention belongs to constant current hydrostatic slideway and control mode thereof, is particularly useful for the type variable constant current hydrostatic slideway mechanism of superduty NC rotary table institute adapted.
Background technology:
Hydrostatic slideway is widely used on the Digit Control Machine Tool owing to have advantages such as frictional resistance is little, long service life, velocity interval is wide, resistance to shock good, kinematic accuracy is high, adaptation is good.
Hydrostatic slideway divides two kinds of constant current hydrostatic slideway and constant voltage hydrostatic slideways again; The oil film rigidity of constant current static pressure is higher than the oil film rigidity of constant voltage static pressure; Say in theory: the oil film rigidity of hydrostatic slideway becomes the variation relation of 3 powers with oil clearance, the load variations of workbench can cause the variation of oil clearance, thereby changes oil film rigidity; In a sizable load range; The buoyance lift amount variable quantity of constant current static pressure is very little, and oil film thickness remains unchanged basically, so the guide rail of workbench generally all adopts the constant current hydrostatic slideway.
Along with modern machine develops towards the super large-scale direction; The required load capacity of workbench also requires increasing; When the pressure differential between unloaded and fully loaded had reached more than 2 times, the buoyance lift amount of constant current hydrostatic slideway when little load was 1.25 times of buoyance lift amount of full load, and it is big that oil clearance becomes; Oil film rigidity diminishes, and can produce certain influence to the processing of workpiece.
Summary of the invention:
Main purpose of the present invention is to deficiency of the prior art, design a kind of change constant current hydrostatic slideway that is applicable to the super large load capacity with and control mode: the pressure of hydrostatic slideway is adjusted in constant current when the little load; Constant voltage increases hydrostatic slideway and gets flow when big load, is consistent with oil clearance, the oil film rigidity that satisfies workbench hydrostatic slideway under various carrying conditions.
The said type variable constant current of the present invention hydrostatic slideway mainly contains three parts such as static pressure mechanism, oil circuit monitoring system and oil path control system and forms.Static pressure mechanism forms open type constant current hydrostatic slideway by constant current fueller and hydrostatic slideway plate; The oil circuit monitoring system mainly is made up of the flow sensor that is installed in front, static pressure chamber, pressure sensor, mainly plays the pressure in monitoring static pressure chamber, the effect of flow; Oil path control system mainly is made up of the variable-frequency motor and the PLC (programmable logic controller (PLC)) that drive the constant current fueller.Form open type static pressure guide rail between hydrostatic slideway plate and the guide rail; Constant current fueller by the variable-frequency motor driving; Link by the mode in a pump one chamber and the static pressure chamber of each hydrostatic slideway plate; Hydraulic oil is assigned in each static pressure chamber through the constant current fueller uniformly; The flow that guarantees the static pressure oil in each static pressure chamber is all identical, forms the constant current open type static pressure guide rail.Each outlet at the constant current fueller is provided with pressure sensor and flow sensor.Variable-frequency motor, pressure sensor and flow sensor all link with PLC.
The control procedure and the mode of the said type variable constant current of the present invention hydrostatic slideway are:
1, behind the startup play button, the variable-frequency motor that drives the constant current fueller starts, and travels at the uniform speed by the speed of appointment;
2, hydraulic oil is assigned in each static pressure chamber through the constant current fueller uniformly, forms the constant current open type static pressure guide rail;
3, the monitoring of flow sensor and pressure sensor and warning:
(a) flow sensor detects the rate of discharge of constant current fueller, and monitoring variable-frequency motor whether as requested rotating speed carries out work, and normal sender; When there not being sender then to report to the police, this moment should shutdown inspection;
(b) pressure sensor detects the pressure in the static pressure oil pocket in real time, and force value is transported among the PLC real-time loading condition is judged; When there not being force value then to report to the police, this moment should shutdown inspection;
4, the PLC program reads the pressure signal judgement pressure size that each pressure sensor is passed back,
(a) when pressure is too small, show that load capacity is little, the buoyance lift amount of system is big, and reduce the area in total static pressure chamber through PLC stop part constant current fueller this moment, increases the oil pressure in the static pressure chamber, reduces the buoyance lift amount of whole system;
(b) when pressure is excessive, PLC program directs variable-frequency motor runs up, and constant current fueller rotating speed improves rate of discharge and increases, and the flow in the static pressure chamber increases, and guarantees that whole system has enough buoyance lift amounts;
(c) through to the control of variable-frequency motor, the excursion of buoyance lift amount that can make whole system is in 0.1mm～0.02mm.
Because the present invention's said type variable constant current hydrostatic slideway and control method; The constant current fueller design of adopting variable-frequency motor to drive; And monitor and manage by the mode in a pump one chamber, utilize PLC that real-time loading condition is judged, handle and feedback through signal; Operating mode to constant current fueller, static pressure cavity pressure, variable-frequency motor etc. is carried out suitable control, to guarantee that sufficient static pressure oil is arranged on the guide rail; Improve or reduce the buoyance lift amount of whole system, the excursion of buoyance lift amount that makes whole system is in the scope that the Precision Machining of regulation allows, can satisfy the processing request of high precision machine tool.
Description of drawings:
Accompanying drawing 1: type variable constant current hydrostatic slideway principle schematic;
Accompanying drawing 2: type variable constant current hydrostatic slideway cutaway view;
Accompanying drawing 3: type variable constant current hydrostatic slideway logic control chart.
The specific embodiment:
Accompanying drawing 2 is partial enlarged drawings of I part in the accompanying drawing 1, is the cutaway view of the said type variable constant current of the present invention hydrostatic slideway part.Form hydrostatic slideway between hydrostatic slideway plate 5 and the guide rail 6, be provided with static pressure chamber 7 in the hydrostatic slideway plate 5; Variable-frequency motor 2 is connected with constant current fueller 1 and drives constant current fueller 1; Constant current fueller 1 is connected on the static pressure chamber 7 in each hydrostatic slideway by the mode in a pump one chamber; Variable-frequency motor travels at the uniform speed by the speed of appointment during beginning; Hydraulic oil is assigned in each static pressure chamber through the constant current fueller uniformly, forms the constant current open type static pressure guide rail.
What provide in the accompanying drawing 1 is the said type variable constant current of the present invention hydrostatic slideway principle schematic.Each outlet at constant current fueller 1 is equipped with pressure sensor 3 and flow sensor 4, and flow sensor 4 is connected with static pressure chamber 7.Variable-frequency motor 2, pressure sensor 3 and flow sensor 4 all link with PLC.
The effect of flow sensor is the rate of discharge that detects the constant current fueller, guarantees to have on the guide rail sufficient static pressure oil, and the monitoring variable-frequency motor whether as requested rotating speed carry out work, whole oil circuit is shielded; Pressure sensor then detects the pressure in the static pressure oil pocket in real time, supplies PLC that current loading condition is judged.When workbench moved, the PLC program read the pressure signal judgement pressure size that each pressure sensor is passed back earlier, when pressure is too small; Show that load capacity is little; The buoyance lift amount of system is big, and reduce the area in total static pressure chamber through PLC stop part constant current fueller this moment; Increase the oil pressure in the static pressure chamber, reduce the buoyance lift amount of whole system; When pressure was excessive, PLC program directs variable-frequency motor ran up, and constant current fueller rotating speed improves rate of discharge and increases, and the flow in the static pressure chamber increases, and guarantees that whole system has enough buoyance lift amounts.Through the control to variable-frequency motor, the buoyance lift amount that makes whole system is in the excursion of regulation, to satisfy the processing request of high precision machine tool.
The phantom wire frame representation on the right in the accompanying drawing 1 the drawn constant current fueller, can also according to the more constant current fueller of increase in demand group in figure.
Said constant current fueller both can be a multi-head pump among the present invention; It also can be multiple spot gear separator; It can also be the identical gear pump group of discharge capacity; Or the form that combines by various gasoline economizers.
What accompanying drawing 3 provided is the said type variable constant current of the present invention hydrostatic slideway logic control chart.In the figure, the work of the said type variable constant current of the present invention hydrostatic slideway and the logic control relation between operating process and the corresponding various piece have been described.Its particular content is clearly described in Fig. 3 with in the preamble step by step, so repeat no more.
Claims (7)
1. type variable constant current hydrostatic slideway; Form by static pressure mechanism, oil circuit monitoring system, oil path control system three parts; It is characterized in that; Static pressure mechanism is made up of constant current fueller and hydrostatic slideway plate, forms hydrostatic slideway between hydrostatic slideway plate and the guide rail, is provided with the static pressure chamber in the hydrostatic slideway plate; Link by the constant current fueller of variable-frequency motor driving and the static pressure chamber of hydrostatic slideway; The oil circuit monitoring system is made up of the flow sensor that is installed in front, static pressure chamber, pressure sensor, i.e. each outlet at the constant current fueller is provided with pressure sensor and flow sensor; Oil path control system is made up of variable-frequency motor and PLC, and promptly variable-frequency motor, pressure sensor and flow sensor all link with PLC.
2. according to the said type variable constant current of claim 1 hydrostatic slideway; It is characterized in that; Said constant current fueller is connected on the static pressure chamber of each hydrostatic slideway according to the mode in a pump one chamber; Hydraulic oil is assigned in each static pressure chamber through the constant current fueller, guarantees that the flow of the static pressure oil in each static pressure chamber is all identical, forms the constant current open type static pressure guide rail.
3. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that said constant current fueller is a multi-head pump.
4. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that said constant current fueller is a multiple spot gear separator.
5. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that said constant current fueller is the identical gear pump group of discharge capacity.
6. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that said constant current fueller is combined by gasoline economizer.
7. according to the said type variable constant current of claim 1 hydrostatic slideway, its control procedure and mode are:
(1) behind the startup play button, the variable-frequency motor that drives the work of constant current fueller starts, and travels at the uniform speed by the speed of appointment;
(2) hydraulic oil is evenly assigned in each static pressure chamber through the constant current fueller, forms the constant current open type static pressure guide rail;
(3) monitoring of flow sensor and pressure sensor and warning:
A) flow sensor detects the rate of discharge of constant current fueller, and monitoring variable-frequency motor whether as requested rotating speed carries out work, and normal sender; When there not being sender then to report to the police, this moment shutdown inspection;
B) pressure sensor detects the pressure in the static pressure oil pocket in real time, and force value is transported among the PLC real-time loading condition is judged; When there not being force value then to report to the police, this moment shutdown inspection;
(4) the PLC program reads the pressure signal judgement pressure size that each pressure sensor is passed back,
A) when pressure is too small, show that load capacity is little, the buoyance lift amount of system is big, and reduce the area in total static pressure chamber through PLC stop part constant current fueller this moment, increases the oil pressure in the static pressure chamber, reduces the buoyance lift amount of whole system;
B) when pressure is excessive, PLC program directs variable-frequency motor runs up, and constant current fueller rate of discharge increases, and the flow in the static pressure chamber increases, and guarantees that whole system has enough buoyance lift amounts;
C) through to the control of variable-frequency motor, the excursion of buoyance lift amount that can make whole system is in 0.01mm～0.02mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105122596A CN102009353B (en) | 2010-10-19 | 2010-10-19 | Variable constant-current static pressure guide rail and control method |
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| CN2010105122596A CN102009353B (en) | 2010-10-19 | 2010-10-19 | Variable constant-current static pressure guide rail and control method |
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| CN102009353B true CN102009353B (en) | 2012-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105773299A (en) * | 2016-04-21 | 2016-07-20 | 广东工业大学 | Oil seal device convenient to measure oil pressure of oil cavities of vertical ultraprecise static-pressure guide rail |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102990473A (en) * | 2012-11-20 | 2013-03-27 | 芜湖日升重型机床有限公司 | Oil film thickness measuring device for operating platform |
| CN103790881B (en) * | 2013-11-28 | 2015-10-28 | 芜湖恒升重型机床股份有限公司 | The control method of vertical lathe hydrostatic slideway control device |
| CN104772653B (en) * | 2015-04-28 | 2017-09-15 | 安徽工程大学 | The Oil Film Thickness for Hydrostatic Slide control system and method compensated based on oil temperature |
| CN113504763B (en) * | 2021-07-12 | 2022-08-09 | 武汉武重机床有限公司 | Method, device and equipment for controlling load weight of workbench and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2614287Y (en) * | 2001-12-28 | 2004-05-05 | 哈尔滨电机厂有限责任公司 | A hydrostatic bearing variation constant-current oil supply system |
| KR100635387B1 (en) * | 2004-02-04 | 2006-10-17 | 이상조 | In-situ monitoring sensor for cnc machine |
| CN201258883Y (en) * | 2008-08-29 | 2009-06-17 | 天水锻压机床有限公司 | Static pressure unloading cavity hydraulic control system |
| CN201534283U (en) * | 2009-11-24 | 2010-07-28 | 天津市精诚机床制造有限公司 | Hydrostatic rail hydraulic system for revolving workbench of heavy numerical control cylindrical gear milling machine |
| CN201833182U (en) * | 2010-10-19 | 2011-05-18 | 武汉重型机床集团有限公司 | Variable constant-current static-pressure guide rail |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105773299A (en) * | 2016-04-21 | 2016-07-20 | 广东工业大学 | Oil seal device convenient to measure oil pressure of oil cavities of vertical ultraprecise static-pressure guide rail |
| CN105773299B (en) * | 2016-04-21 | 2018-03-09 | 广东工业大学 | A kind of close hydrostatic slideway oil pocket oil pressure of vertical superfinishing just surveys oil-sealing arrangement |
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