CN201848723U - Digital ultra-precision multifunctional static-pressure lead screw controlled by electrohydraulic servo pump - Google Patents
Digital ultra-precision multifunctional static-pressure lead screw controlled by electrohydraulic servo pump Download PDFInfo
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- CN201848723U CN201848723U CN2010205926795U CN201020592679U CN201848723U CN 201848723 U CN201848723 U CN 201848723U CN 2010205926795 U CN2010205926795 U CN 2010205926795U CN 201020592679 U CN201020592679 U CN 201020592679U CN 201848723 U CN201848723 U CN 201848723U
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- oil cavity
- annular oil
- lead screw
- leading screw
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
A digital ultra-precision multifunctional static-pressure lead screw controlled by an electrohydraulic servo pump is provided with a lead screw, a lead screw nut and a second oil supply system. The lead screw nut is sleeved on the periphery of the lead screw, a first annular oil cavity and a second annular oil cavity are respectively formed between the inner side of one end of the lead screw nut and the lead screw and between the inner side of the other end of the lead screw nut and the lead screw, oil channels which are respectively communicated with the first annular oil cavity and the second annular oil cavity are formed on the lead screw nut, oil is supplied to the first annular oil cavity and the second oil cavity respectively by two digital electrohydraulic servo pump units with the same structures, a displacement sensor which is connected with the two digital electrohydraulic servo pump units is arranged inside the first annular oil cavity or the second annular oil cavity, a radial centering static-pressure bearing which guarantees concentricity of the lead screw with the nut is disposed on the periphery of the end, which is positioned on the first annular oil cavity, of the lead screw, a press cover is arranged at the end, which is positioned on the first annular oil cavity, of the lead screw, and a sealing plug is disposed at the end, which is positioned on the second annular oil cavity, of the lead screw. The digital ultra-precision multifunctional static-pressure lead screw has the functions of cutting load indication and capability of preventing collision, and can adopt a servo motor or a variable-frequency motor as a servo pump driving motor.
Description
Technical field
The utility model relates to a kind of static pressure leading screw.Particularly relate to a kind of multi-functional static pressure leading screw of digital super essence with electro-hydraulic servo pump control of super fine positioning function and ultra micro feed function.
Background technology
The static pressure leading screw is the traditional classical functional part of a kind of existing over half a century use experience, and it has the following advantages:
1, bearing capacity is big, rigidity height, good anti-vibration, stable drive;
2, frictional resistance is little, transmission efficiency height (can up to 99%), and low speed is not creeped;
3, no backlass, the positioning accuracy height;
4, the normal use do not have wearing and tearing, and the life-span is long, and precision stability is good;
5, oil film has the effect of homogenizing leading screw mismachining tolerance, thereby can improve transmission accuracy greatly.
Owing to have above advantage, the static pressure leading screw has obtained to use comparatively widely on precision machine tool and heavy machine tool, but development along with industrial technology, the particularly development of national defense industry, the development of aircraft industry, to the positioning accuracy request of lathe more and more higher (≤0.0001mm), that the amount of feeding that adds man-hour also requires is more and more higher (≤0.0001mm), high like this required precision, not only common ball-screw can't realize that the static pressure leading screw of traditional structure also can't reach.
Fig. 1 is traditional constant pressure oil supply static pressure leading screw schematic diagram.When unloaded, has a certain pressure P from what the static pressure oil supply system was supplied with
SHydraulic oil flow into respectively in the annular oil cavity of nut thread two sides through the fixed restriction device, form oil pocket pressure.Because the effective bearing area of oil pocket is identical and the flow controller resistance equates, thereby oil pocket pressure is equal, and the side clearance between nut and the leading screw equates that the leading screw tooth is in nut tooth centre position, and the design top nut can not be rotated.When leading screw rotated, the helicoid of its screw thread produced displacement left, made the left side gap smaller, it is big that the gap, right side becomes, under the pressure regulation effect of flow controller, left side oil pocket pressure raises, and right side oil pocket pressure reduces, forming thrust is moved to the left nut, and stop in new position, rotate continuously as leading screw, then nut is moved to the left continuously, when leading screw oppositely operated, nut also oppositely moved right.
During the work of static pressure leading screw, oil film separates nut and leading screw, there are not the contact and the friction of metal to metal, has only the interior friction of hydraulic oil, its coefficient of friction only has 0.0005, this coefficient of friction (0.1～0.3) not only less than metal to metal, also 0.005 low 10 times than ball-screw, thereby can realize higher positioning accuracy and littler feeding equivalent and other series of advantages.
During the work of static pressure leading screw, a general nut moving linearly, when the resistance of motion changes, the relative position of nut and leading screw can change, the oil film thickness that is the annular oil cavity of nut thread two sides changes, and this variation generally has only several microns, and this is still all well and good precision concerning most of lathes, but in microstoning, the variation of this order of magnitude is unallowed.In addition, on general common precision machine tool, can realize that several microns feeding resolution ratio also can meet the demands, but in the microstoning, need feeding resolution ratio≤0.00001. in order to realize this microstoning requirement, need improve and improve existing static pressure leading screw.
Summary of the invention
The utility model provides a kind of multi-functional static pressure leading screw of digital super essence that can realize up to the electro-hydraulic servo pump control of the positioning accuracy of 0.00001mm and ultra micro feeding for solving the technical problem that exists in the known technology.
The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is: a kind of multi-functional static pressure leading screw of digital super essence of electro-hydraulic servo pump control, include: leading screw and the feed screw nut that is enclosed within the leading screw periphery, and second oil supply system, between inboard, feed screw nut two ends and leading screw, be formed with first annular oil cavity and second annular oil cavity, be formed with the oil circuit that is connected with first annular oil cavity and second annular oil cavity on the described feed screw nut, described first annular oil cavity and second annular oil cavity are provided with the displacement transducer that links to each other with two digital electro-hydraulic servo pump groups respectively by two digital electric-hydraulic servopump group fuel feeding that structure is identical in described first annular oil cavity or second annular oil cavity; The periphery that is positioned at first annular oil cavity, one end at leading screw is provided with and is used to the radial centering hydrostatic bearing that guarantees that leading screw and nut are concentric; An end that is positioned at first annular oil cavity at leading screw is provided with gland; It is stifled that an end that is positioned at second annular oil cavity at leading screw is provided with sealing.
Described radial centering hydrostatic bearing is made up of nut and the radial centering hydrostatic bearing cover that is enclosed within this nut periphery.
Described digital electric-hydraulic servopump group includes fuel tank, filter, pump and the smart oil filter that is communicated with successively by fuel feed pump, the other end of described smart oil filter by fuel feed pump to first annular oil cavity and the second annular oil cavity fuel feeding, described pump also connects servomotor, and described servomotor connects displacement transducer by second amplifier, comparator and first amplifier successively.
Advantage and the good effect that the utlity model has are: the multi-functional static pressure leading screw of digital super essence of electro-hydraulic servo pump control of the present utility model has following function.
1, cutting load deixis is because of the detected displacement size of displacement transducer is actually proportional with cutting load.
2, but machine cut adds the anticollision in man-hour, when maloperation and lathe occurring when out of control, displacement transducer can the perception nut and leading screw between the super normal displacement of position, withdraw from signal thereby send to shut down, the protection lathe is not damaged.
3, the servopump drive motors of the utility model use, both available servomotor, also available variable-frequency motor.
Description of drawings
Fig. 1 is traditional constant pressure oil supply annular oil cavity static pressure screw-nut structure schematic diagram;
Fig. 2 is the multi-functional static pressure screw structure of the digital super essence schematic diagram of electro-hydraulic servo pump control of the present utility model;
Fig. 3 is the A-A cut-away view of Fig. 2;
Fig. 4 is the digital static pressure leading screw control principle figure of electro-hydraulic servo pump control of the present utility model.
Label among the figure is respectively:
1-leading screw; 2-gland; 3-radial centering hydrostatic bearing cover; 4-nut; 5-feed screw nut; 6-displacement sensor; 7-sealing is stifled; 8-the first amplifier; 9,9 '-comparator; 10,10 '-the second amplifiers; 11,11 '-smart oil filter; 12,12 '-pump; 13,13 '-servomotor; 14,14 '-filter; 15,15 '-fuel tank; 16-; 17-fuel tank; 18-thick oil filter; 19-motor; 20-oil pump; 21-thick oil filter; 22-smart oil filter; 23-overflow valve; 24-accumulator; 25-Pressure gauge; 26,27,28,29-centering static pressure oil groove; 30-oil-recovery tank; 31-cooler; 32-the first annular oil cavity; 33-the second annular oil cavity; 34-oil circuit; 35-servo-drive; 36-servomotor; 37-static pressure leading screw; 38-servo-drive; 39-servomotor; 40-constant flow pump; 41-static pressure nut; 42-displacement transducer; 43-travelling table; 44-check grating; 45-system command signal; A-first oil supply system; B-second oil supply system.
The specific embodiment
Make a detailed description below in conjunction with embodiment and accompanying drawing the multi-functional static pressure leading screw of digital super essence electro-hydraulic servo pump control of the present utility model.
As shown in Figure 2, the multi-functional static pressure leading screw of digital super essence of electro-hydraulic servo pump control of the present utility model, include: leading screw 1 and the feed screw nut 5 that is enclosed within leading screw 1 periphery, and the second oil supply system B, between inboard, feed screw nut 5 two ends and leading screw 1, be formed with first annular oil cavity 32 and second annular oil cavity 33, be formed with the oil circuit 34 that is connected with first annular oil cavity 32 and second annular oil cavity 33 on the described feed screw nut 5, described first annular oil cavity 32 and second annular oil cavity 33 are respectively by two digital electric-hydraulic servopump group fuel feeding that structure is identical.Described digital electric-hydraulic servopump group includes: the fuel tank 15, filter 14, pump 12 and the smart oil filter 11 that are communicated with successively by fuel feed pump, the other end of described smart oil filter 11 by fuel feed pump to first annular oil cavity 32 and second annular oil cavity, 33 fuel feeding, described pump 12 also connects servomotor 13, and described servomotor 13 connects displacement transducer 6 by second amplifier 10, comparator 9 and first amplifier 8 successively.The digital electric-hydraulic servopump group mutual group that described two structures are identical becomes the first oil supply system A of the multi-functional static pressure leading screw of digital super essence of the utility model electro-hydraulic servo pump control.And traditional constant oil supply pressure system as shown in Figure 3 constitutes the second oil supply system B of the present utility model.
Be provided with the displacement transducer 6 that links to each other with two digital electro-hydraulic servo pump groups in described first annular oil cavity 32 or second annular oil cavity 33; The periphery that is positioned at first annular oil cavity, 32 1 ends at leading screw 1 is provided with and is used to the radial centering hydrostatic bearing that guarantees that leading screw and nut are concentric, described radial centering hydrostatic bearing is made up of nut 4 and the radial centering hydrostatic bearing cover 3 that is enclosed within these nut 4 peripheries, when the leading screw diameter is big, length more in short-term, can not adopt the centering hydrostatic bearing, can reduce cost greatly like this; An end that is positioned at first annular oil cavity 32 at leading screw 1 is provided with gland 2; An end that is positioned at second annular oil cavity 33 at leading screw 1 is provided with sealing stifled 7.
In the utility model, displacement transducer 6 is used to detect the relative axial position of nut 4 and leading screw 1, when remaining static, the threads of lead screw two sides equate with the nut thread side clearance, two groups of digital electric-hydraulic servopump group specification same rotational speed are identical, so two annular oil cavity oil pressure equate that this moment, the output signal of displacement transducer was zero.When leading screw rotation nut moves, screw thread two side clearances do not wait, pressure improves in the little side ring shape oil pocket in gap, and the big lateral pressure in gap reduces, at this moment, displacement transducer 6 sends displacement signal, L relatively amplifies through and instruction, sends positive feedback signal for the little side in gap, and revolution speed is improved, send negative-feedback signal for the big side servopump in gap, its rotating speed is descended.When the formed thrust of oil pressure difference of two annular oil cavities equated with load, nut and leading screw relative position no longer changed.This static pressure leading screw through servopump and the closed-loop control of displacement transducer formation, the difference of nut and threads of lead screw two side clearances (oil film thickness variation) is more much smaller than traditional static pressure leading screw of open loop control during work, has only about 1/10 of traditional static pressure leading screw, thereby adopt the static pressure leading screw rigidity of electro-hydraulic servo oil pump feed higher, precision is higher, its positioning accuracy depends on the resolution ratio of displacement transducer, and when the resolution ratio of displacement transducer was 1nm, positioning accuracy can be up to 10nm.This also means, this use electro-hydraulic servo pump control, can realize small feeding with the closed-loop control static pressure leading screw of high-resolution (1nm) displacement transducer detection thread pitch up to 10nm.
Claims (3)
1. the multi-functional static pressure leading screw of digital super essence of electro-hydraulic servo pump control, include: leading screw (1) and be enclosed within the feed screw nut (5) of leading screw (1) periphery, and second oil supply system (B), it is characterized in that: between inboard, feed screw nut (5) two ends and leading screw (1), be formed with first annular oil cavity (32) and second annular oil cavity (33), be formed with the oil circuit (34) that is connected with first annular oil cavity (32) and second annular oil cavity (33) on the described feed screw nut (5), described first annular oil cavity (32) and second annular oil cavity (33) are provided with the displacement transducer (6) that links to each other with two digital electro-hydraulic servo pump groups respectively by two digital electric-hydraulic servopump group fuel feeding that structure is identical in described first annular oil cavity (32) or second annular oil cavity (33); The periphery that is positioned at first annular oil cavity (32) one ends at leading screw (1) is provided with and is used to the radial centering hydrostatic bearing that guarantees that leading screw and nut are concentric; An end that is positioned at first annular oil cavity (32) at leading screw (1) is provided with gland (2); An end that is positioned at second annular oil cavity (33) at leading screw (1) is provided with sealing stifled (7).
2. the multi-functional static pressure leading screw of digital super essence of electro-hydraulic servo pump control according to claim 1, it is characterized in that described radial centering hydrostatic bearing is made up of nut (4) and the radial centering hydrostatic bearing cover (3) that is enclosed within this nut (4) periphery.
3. the multi-functional static pressure leading screw of digital super essence of electro-hydraulic servo pump control according to claim 1, it is characterized in that, described digital electric-hydraulic servopump group includes the fuel tank (15) that is communicated with successively by fuel feed pump, filter (14), pump (12) and smart oil filter (11), the other end of described smart oil filter (11) by fuel feed pump to first annular oil cavity (32) and second annular oil cavity (33) fuel feeding, described pump (12) also connects servomotor (13), and described servomotor (13) is successively by second amplifier (10), comparator (9) and first amplifier (8) connect displacement transducer (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205926795U CN201848723U (en) | 2010-11-04 | 2010-11-04 | Digital ultra-precision multifunctional static-pressure lead screw controlled by electrohydraulic servo pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205926795U CN201848723U (en) | 2010-11-04 | 2010-11-04 | Digital ultra-precision multifunctional static-pressure lead screw controlled by electrohydraulic servo pump |
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| Publication Number | Publication Date |
|---|---|
| CN201848723U true CN201848723U (en) | 2011-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205926795U Expired - Lifetime CN201848723U (en) | 2010-11-04 | 2010-11-04 | Digital ultra-precision multifunctional static-pressure lead screw controlled by electrohydraulic servo pump |
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| Country | Link |
|---|---|
| CN (1) | CN201848723U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001016A (en) * | 2010-11-04 | 2011-04-06 | 路文忠 | Digital ultraprecise multifunctional hydrostatic lead screw controlled by electrohydraulic servo pump |
| WO2021151647A1 (en) * | 2020-01-30 | 2021-08-05 | Khs Gmbh | Hygienic screw-thread adjusting device for a container treatment machine and method for cleaning the screw-thread adjusting device |
-
2010
- 2010-11-04 CN CN2010205926795U patent/CN201848723U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001016A (en) * | 2010-11-04 | 2011-04-06 | 路文忠 | Digital ultraprecise multifunctional hydrostatic lead screw controlled by electrohydraulic servo pump |
| CN102001016B (en) * | 2010-11-04 | 2012-09-26 | 路文忠 | Digital ultraprecise multifunctional hydrostatic lead screw controlled by electrohydraulic servo pump |
| WO2021151647A1 (en) * | 2020-01-30 | 2021-08-05 | Khs Gmbh | Hygienic screw-thread adjusting device for a container treatment machine and method for cleaning the screw-thread adjusting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110601 Effective date of abandoning: 20120926 |