CN109333077B - Dislocation type opposite pressurizing groove oil seal surface type liquid static pressure rotary table - Google Patents
Dislocation type opposite pressurizing groove oil seal surface type liquid static pressure rotary table Download PDFInfo
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- CN109333077B CN109333077B CN201811179267.6A CN201811179267A CN109333077B CN 109333077 B CN109333077 B CN 109333077B CN 201811179267 A CN201811179267 A CN 201811179267A CN 109333077 B CN109333077 B CN 109333077B
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- groove
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/25—Movable or adjustable work or tool supports
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/25—Movable or adjustable work or tool supports
- B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
- B23Q1/38—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
Abstract
The invention discloses a staggered type opposite pressurizing groove oil sealing surface type hydrostatic pressure rotary table which comprises a fixing piece and a rotary body arranged on the fixing piece, wherein the fixing piece and the rotary body are coaxially assembled, a plurality of oil cavities are uniformly formed in the upper surface of the fixing piece along the circumferential direction, an oil inlet channel is formed in the center of the bottom of each oil cavity, each oil cavity is communicated with the outside through the oil inlet channel, a first annular pressurizing groove and a second annular pressurizing groove are formed in the surface, in contact with the rotary body, of the fixing piece, the first annular pressurizing groove is located on the inner side of each oil cavity, the second annular pressurizing groove is located on the outer side of each oil cavity, a third annular pressurizing groove and a fourth annular pressurizing groove are formed in the surface, in contact with the fixing piece, of the rotary body, the third annular pressurizing groove is close to the inner side. The opposite pressurizing grooves are formed in the inner oil sealing surface and the outer oil sealing surface of the static pressure rotary table, so that the oil outlet liquid resistance of the static pressure rotary table is increased, and the bearing capacity and the oil film rigidity of the static pressure rotary table are improved.
Description
Technical Field
The invention belongs to the technical field of machine tool guide rails, and particularly relates to a staggered type opposite pressurizing groove oil seal surface type hydrostatic pressure rotary table.
Background
The development of the precision and ultra-precision technology directly influences the development of the national defense industry and the civil industry, the ultra-precision machine tool is the primary foundation for realizing ultra-precision machining, the guide rail is used as a key component of the ultra-precision machine tool, the performance of the guide rail determines the precision of the ultra-precision machine tool to a great extent, and the hydrostatic guide rail can meet the supporting requirements of high bearing capacity, high rigidity, high speed and the like of the precision numerical control machine tool and other mechanical equipment and is widely applied. The working principle of the hydrostatic guide rail is as follows: when the floating amount of the revolving body is greater than the surface unevenness of the upper and lower bearing planes, an oil film is formed between the revolving body and the guide rail, pure liquid friction is formed between the revolving body and the guide rail, and the external load acting on the revolving body is balanced by the pressure of the oil cavity. In the working process, the oil cavity pressure changes along with the change of the external load acting on the revolving body so as to balance the external load acting on the revolving body and ensure that the revolving body and the guide rail are always in a pure liquid friction state during working, so that the rigidity of the oil cavity is greatly influenced by the external load.
For a traditional hydrostatic guide rail or a hydrostatic rotary table, a parallel flat plate type oil sealing surface is adopted. In order to resist the change of the external load, the oil entering the oil chamber changes the pressure of the oil chamber through the liquid resistance formed by the parallel flat plate gaps which change along with the change of the load so as to adapt to the requirement of the external load. When the concentrated load acts on the rotary table of the hydrostatic pressure rotary table, the deformation of the rotary table causes the gap between the inner oil sealing surface and the outer oil sealing surface to be uneven, and simultaneously, the rotary motion of the rotary table causes the oil in the oil film to be thrown outwards under the action of centrifugal force, so that the unevenness of the oil film is intensified. In order to increase the resistance of the oil in the oil film thrown outwards under the action of centrifugal force, a pair of opposite pressurizing grooves are respectively arranged on the inner sealing oil edge and the outer sealing oil edge of the hydrostatic rotary table, and the final purpose is to improve the uniformity of the oil film.
Disclosure of Invention
The invention aims to provide a dislocation type opposite pressurizing groove oil sealing surface type hydrostatic rotary table, which solves the problems of low bearing capacity and poor oil film rigidity of the conventional hydrostatic rotary table.
The invention adopts the technical scheme that the staggered opposite pressurizing groove oil surface sealing type hydrostatic pressure rotary table comprises a fixing piece and a rotary body arranged on the fixing piece, wherein the fixing piece and the rotary body are coaxially assembled, a plurality of oil cavities are uniformly formed in the upper surface of the fixing piece along the circumferential direction, an oil inlet channel is formed in the center of the bottom of each oil cavity, the oil cavities are communicated with the outside through the oil inlet channels, a first annular pressurizing groove and a second annular pressurizing groove are formed in the surface, in contact with the rotary body, of the fixing piece, the first annular pressurizing groove is positioned on the inner side of the oil cavity, the second annular pressurizing groove is positioned on the outer side of the oil cavity, a third annular pressurizing groove and a fourth annular pressurizing groove are formed in the surface, in contact with the fixing piece, of the rotary body, the third annular pressurizing groove is close to the inner side of the rotary.
The present invention is also characterized in that,
the width of each of the first annular pressurizing groove, the second annular pressurizing groove, the third annular pressurizing groove and the fourth annular pressurizing groove is 0.4-0.6 mm, and the depth of each of the first annular pressurizing groove, the second annular pressurizing groove, the third annular pressurizing groove and the fourth annular pressurizing groove is 0.4-0.8 mm.
The first annular plenum groove and the third annular plenum groove form a first set of offset opposing plenum grooves and the second annular plenum groove and the fourth annular plenum groove form a second set of offset opposing plenum grooves.
The dislocation distance between the first annular pressurizing groove and the third annular pressurizing groove is 0.2-0.3 mm, and the dislocation distance between the second annular pressurizing groove and the fourth annular pressurizing groove is 0.2-0.3 mm.
The fixing piece and the revolving body are provided with mounting through holes at the corresponding positions of the centers.
The beneficial effect of the invention is that,
the opposite pressurizing grooves are formed in the inner oil sealing surface and the outer oil sealing surface of the static pressure rotary table, so that the oil outlet liquid resistance of the static pressure rotary table is increased, and the bearing capacity and the oil film rigidity of the static pressure rotary table are improved.
Drawings
FIG. 1 is a side view of a staggered opposed plenum groove oil seal hydrostatic turret of the present invention;
FIG. 2 is a top view of the stationary member of the staggered opposed pressurized slot oil seal hydrostatic turret of the present invention;
FIG. 3 is a bottom view of a revolving body in the staggered opposed pressurized groove oil seal type hydrostatic pressure rotary table of the present invention;
FIG. 4 is a side view of a conventional hydrostatic pressure turret;
FIG. 5 is a bottom view of a rotary body in a conventional hydrostatic pressure turret;
fig. 6 is a plan view of a fixture in a conventional hydrostatic pressure turntable.
In the figure, 1 is a revolving body, 2 is a third annular supercharging groove, 3 is a fourth annular supercharging groove, 4 is a second annular supercharging groove, 5 is an oil inlet channel, 6 is an oil cavity, 7 is a first annular supercharging groove, and 8 is a fixing part.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The side view of the dislocation type opposite pressurizing groove oil seal type hydrostatic pressure rotary table is shown in figure 1 and comprises a fixed part 8 and a rotary body 1 arranged on the fixed part 8, wherein the fixed part 8 and the rotary body 1 are coaxially assembled, mounting through holes are formed in the centers of the fixed part 8 and the rotary body 1, a plurality of oil cavities 6 are uniformly formed in the upper surface of the fixed part 8 along the circumferential direction, an oil inlet channel 5 is arranged in the center of the bottom of each oil cavity 6, and the oil cavities 6 are communicated with the outside through the oil inlet channels 5;
a first annular supercharging groove 7 and a second annular supercharging groove 4 are formed in the surface, in contact with the revolving body 1, of the fixing body 8, as shown in fig. 2, the first annular supercharging groove 7 is located on the inner side of the oil cavity 6, the second annular supercharging groove 4 is located on the outer side of the oil cavity 6, a third annular supercharging groove 2 and a fourth annular supercharging groove 3 are formed in the surface, in contact with the fixing body 8, of the revolving body 1, as shown in fig. 3, the third annular supercharging groove 2 is close to the inner side of the revolving body 1, and the fourth annular supercharging groove 3 is close to the outer side of the revolving body 1;
the widths and the depths of the first annular supercharging groove 7, the second annular supercharging groove 4, the third annular supercharging groove 2 and the fourth annular supercharging groove 3 are all equal;
the widths and depths of the first annular pressurizing groove 7, the second annular pressurizing groove 4, the third annular pressurizing groove 2 and the fourth annular pressurizing groove 3 are all 0.4-0.6 mm and 0.4-0.8 mm;
the first annular pressurizing groove 7 and the third annular pressurizing groove 2 form a first group of dislocation type opposite pressurizing grooves, the second annular pressurizing groove 4 and the fourth annular pressurizing groove 3 form a second group of dislocation type opposite pressurizing grooves, the dislocation distance between the first annular pressurizing groove 7 and the third annular pressurizing groove 2 is 0.2-0.3 mm, and the dislocation distance between the second annular pressurizing groove 4 and the fourth annular pressurizing groove 3 is 0.2-0.3 mm;
when the widths of the first annular pressurizing groove 7, the second annular pressurizing groove 4, the third annular pressurizing groove 2 and the fourth annular pressurizing groove 3 are all 0.4-0.6 mm, the depths are all 0.4-0.8 mm, the distance between the first annular pressurizing groove 7 and the inner edge of the oil cavity 6 is 5-6 mm, and the distance between the second annular pressurizing groove 4 and the outer edge of the oil cavity 6 is 5-6 mm, the oil cavity pressure lifting effect is most obvious.
The using method comprises the following steps: after the pressure oil is introduced into the feeding oil duct 5, oil liquid exists in the oil chamber 6, at the moment, the oil liquid flows out through the contact surface between the revolving body 1 and the fixed part 8, when the pressure of the introduced oil liquid reaches a certain degree, the revolving body 1 is floated, when the floating amount of the revolving body 1 is greater than the surface unevenness of the upper supporting plane and the lower supporting plane, an oil film is formed between the revolving body 1 and the fixed part 8, namely, pure liquid friction exists between the guide rails, and the external load acting on the revolving body 1 is balanced through the pressure of the oil chamber; in the working process, the oil cavity pressure changes along with the change of the external load acting on the revolving body 1 so as to balance the external load acting on the revolving body 1 and ensure that the revolving body 1 and the fixed part 8 are always in a pure liquid friction state during working; when the oil tank works, oil flows through the oil inlet pipeline and the oil inlet channel 5 to enter the oil cavity 6, and then flows back to the oil tank through the oil sealing surface of the dislocation type opposite pressurizing groove formed by the first annular pressurizing groove 7 and the third annular pressurizing groove 2 and the oil sealing surface of the dislocation type opposite pressurizing groove formed by the second annular pressurizing groove 4 and the fourth annular pressurizing groove 3 to form a loop. This flow of oil forms an oil pad, i.e., a guide oil film, between the bearing surfaces of the hydrostatic guide mount 8 and the rotary body 1, and the characteristics of the hydrostatic rotary table, such as load-bearing capacity and rigidity, depend on the characteristics of the oil film.
Compared with the static pressure rotary table with the traditional structure, the thickness of the oil film of the hydrostatic pressure rotary table changes when the hydrostatic pressure rotary table is uniformly loaded, and the thickness unevenness of the oil film caused by the load is reduced. When oil flows into the oil cavity of the guide surface of the hydrostatic rotary table, the oil flows through the opposite pressurizing grooves formed by the first annular pressurizing groove 7 on the fixing piece 8 and the third annular pressurizing groove 2 on the rotary body 1, the opposite pressurizing grooves formed by the second annular pressurizing groove 4 and the fourth annular pressurizing groove 3 on the rotary body 1. Because the vortex is formed in the groove when the oil flows through the opposite pressurizing grooves, the flowing liquid resistance of the oil is increased, the gain of the pressure of the oil cavity is realized, and the pressurizing effect is more obvious compared with the oil sealing surface without the pressurizing grooves; compared with a single-ring-shaped pressurizing groove, the pressurizing effect is improved. Namely, under the action of the pressurizing grooves which are arranged oppositely inside and outside the oil cavity, the hydraulic resistance of oil flowing through the oil sealing surface of the static pressure rotary table is far larger than that of the traditional static pressure rotary table, as shown in fig. 4, 5 and 6, the pressure of the oil cavity of the static pressure rotary table is improved to a certain extent, and the bearing capacity of the static pressure rotary table is improved; in addition, the opposite pressurizing grooves formed by the second annular pressurizing groove 4 on the fixing piece 8 and the fourth annular pressurizing groove 3 on the revolving body 1 also increase the resistance of oil to be thrown out of an oil cavity due to centrifugal force, so that the problem of dry friction between revolving table surfaces caused by uneven change of an oil film when the existing hydrostatic revolving table is subjected to concentrated load or eccentric load or oil in the oil cavity is thrown out during high-speed movement is solved. Namely, the opposite pressurizing grooves are formed in the inner oil sealing surface and the outer oil sealing surface of the hydrostatic rotary table, so that the oil outlet liquid resistance of the hydrostatic rotary table is increased, and the bearing capacity and the oil film rigidity of the hydrostatic rotary table are improved.
The invention relates to an opposite pressurizing groove type hydrostatic pressure rotary table, which solves the problems of uneven oil film change caused by concentrated load or eccentric load on the conventional hydrostatic pressure rotary table or dry friction between rotary table surfaces caused by throwing oil in an oil cavity out during high-speed movement.
Claims (3)
1. The dislocation type opposite pressurizing groove oil surface sealing type hydrostatic pressure rotary table is characterized by comprising a fixing piece (8) and a rotary body (1) arranged on the fixing piece (8), wherein the fixing piece (8) and the rotary body (1) are coaxially assembled, a plurality of oil cavities (6) are uniformly formed in the upper surface of the fixing piece (8) along the circumferential direction, an oil inlet channel (5) is formed in the center of the bottom of an oil groove of each oil cavity (6), the oil cavities (6) are communicated with the outside through the oil inlet channels (5), a first annular pressurizing groove (7) and a second annular pressurizing groove (4) are formed in the surface, in contact with the rotary body (1), of the fixing piece (8), the first annular pressurizing groove (7) is located on the inner side of each oil cavity (6), the second annular pressurizing groove (4) is located on the outer side of each oil cavity (6), a third annular pressurizing groove (2) and a fourth annular pressurizing groove (3) are formed in the surface, in contact with the fixing piece (8), the third annular supercharging groove (2) is close to the inner side of the revolving body (1), and the fourth annular supercharging groove (3) is close to the outer side of the revolving body (1);
the first annular supercharging groove (7) and the third annular supercharging groove (2) form a first group of dislocation type opposite supercharging grooves, and the second annular supercharging groove (4) and the fourth annular supercharging groove (3) form a second group of dislocation type opposite supercharging grooves; the dislocation distance between the first annular pressurizing groove (7) and the third annular pressurizing groove (2) is 0.2-0.3 mm, and the dislocation distance between the second annular pressurizing groove (4) and the fourth annular pressurizing groove (3) is 0.2-0.3 mm.
2. The staggered opposed pressure increasing groove oil sealing type hydrostatic pressure rotary table according to claim 1, wherein the widths of the first annular pressure increasing groove (7), the second annular pressure increasing groove (4), the third annular pressure increasing groove (2) and the fourth annular pressure increasing groove (3) are all 0.4-0.6 mm, and the depths are all 0.4-0.8 mm.
3. The staggered opposed-pressurized groove oil-seal hydrostatic rotary table of claim 1, wherein the fixing member (8) and the rotary body (1) are provided with mounting through holes at positions corresponding to the centers thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811179267.6A CN109333077B (en) | 2018-10-10 | 2018-10-10 | Dislocation type opposite pressurizing groove oil seal surface type liquid static pressure rotary table |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811179267.6A CN109333077B (en) | 2018-10-10 | 2018-10-10 | Dislocation type opposite pressurizing groove oil seal surface type liquid static pressure rotary table |
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| CN109333077A CN109333077A (en) | 2019-02-15 |
| CN109333077B true CN109333077B (en) | 2021-01-15 |
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| CN201811179267.6A Active CN109333077B (en) | 2018-10-10 | 2018-10-10 | Dislocation type opposite pressurizing groove oil seal surface type liquid static pressure rotary table |
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| CN112935851B (en) * | 2021-02-04 | 2023-08-18 | 江苏开璇智能科技有限公司 | Third harmonic drive fourth-axis turntable with output brake |
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|---|---|---|---|---|
| EP0304090A2 (en) * | 1987-08-20 | 1989-02-22 | Toyoda Koki Kabushiki Kaisha | Hydrostatically supporting device for slide |
| CN201531527U (en) * | 2009-08-03 | 2010-07-21 | 北京工业大学 | Static pressure oil pad with damping flow passage oil cavity and damping type oil sealing edge |
| JP2013136108A (en) * | 2011-12-28 | 2013-07-11 | Jtekt Corp | Slide table device |
| CN203477071U (en) * | 2013-08-22 | 2014-03-12 | 一重集团绍兴重型机床有限公司 | Static-pressure oil cushion |
| CN103659288A (en) * | 2013-11-06 | 2014-03-26 | 西安理工大学 | Hydrostatic guide track |
| CN206425813U (en) * | 2016-12-29 | 2017-08-22 | 西安理工大学 | A kind of swinging type liquid hydrostatic slideway |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2040964U (en) * | 1988-11-23 | 1989-07-12 | 张学仁 | Bernoulli sealing device |
| JP2003065334A (en) * | 2002-06-13 | 2003-03-05 | Nsk Ltd | Hydraulic gas bearing |
| CN101625014B (en) * | 2009-08-03 | 2011-07-27 | 北京工业大学 | Static-pressure oil pad with damping flow channel oil chamber and damping sealing oil edge |
| JP6559937B2 (en) * | 2014-10-28 | 2019-08-14 | 東芝機械株式会社 | Hydrostatic guide mechanism and machine tool |
| CN108119547A (en) * | 2017-12-22 | 2018-06-05 | 上海理工大学 | A kind of dynamic and static pressure cylinder bearing shafting and precision machine tool |
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2018
- 2018-10-10 CN CN201811179267.6A patent/CN109333077B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0304090A2 (en) * | 1987-08-20 | 1989-02-22 | Toyoda Koki Kabushiki Kaisha | Hydrostatically supporting device for slide |
| CN201531527U (en) * | 2009-08-03 | 2010-07-21 | 北京工业大学 | Static pressure oil pad with damping flow passage oil cavity and damping type oil sealing edge |
| JP2013136108A (en) * | 2011-12-28 | 2013-07-11 | Jtekt Corp | Slide table device |
| CN203477071U (en) * | 2013-08-22 | 2014-03-12 | 一重集团绍兴重型机床有限公司 | Static-pressure oil cushion |
| CN103659288A (en) * | 2013-11-06 | 2014-03-26 | 西安理工大学 | Hydrostatic guide track |
| CN206425813U (en) * | 2016-12-29 | 2017-08-22 | 西安理工大学 | A kind of swinging type liquid hydrostatic slideway |
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Effective date of registration: 20230516 Address after: No. 1000, Huayang Road, Zhoushi Town, Kunshan City, Suzhou City, Jiangsu Province 215300 Patentee after: Jiangsu Gutian Automation Co.,Ltd. Address before: 710048 No. 5 Jinhua South Road, Shaanxi, Xi'an Patentee before: XI'AN University OF TECHNOLOGY |
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