CN108488523B - Central rotary joint structure - Google Patents

Central rotary joint structure Download PDF

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Publication number
CN108488523B
CN108488523B CN201810118170.8A CN201810118170A CN108488523B CN 108488523 B CN108488523 B CN 108488523B CN 201810118170 A CN201810118170 A CN 201810118170A CN 108488523 B CN108488523 B CN 108488523B
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rotary shaft
rotary
hole
holes
shape
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CN108488523A (en
Inventor
夏泽民
徐勤军
潘逸明
高海波
陶科
缪勤竹
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Jiangsu Changling Hydraulic Co ltd
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Jiangsu Changling Hydraulic Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
    • F16L39/06—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies of the multiline swivel type, e.g. comprising a plurality of axially mounted modules

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The invention discloses a central rotary joint structure which comprises a rotary shaft and a rotary body, wherein the rotary shaft is provided with a plurality of rotary shaft axial holes and rotary shaft radial holes which are communicated in an L shape, the rotary body is provided with rotary body radial holes corresponding to the port positions of the rotary shaft radial holes, filling blocks are filled between the hole bottom of the rotary shaft axial holes and the hole wall edge of the rotary shaft radial holes, the shape of each filling block is matched with the shape of one side of the hole bottom of each rotary shaft axial hole, the shape of each filling block positioned on the intersection side of the rotary shaft radial holes and the rotary shaft axial holes is a transition cambered surface, and the edge part of the intersecting line of the rotary shaft axial holes and the rotary shaft radial holes is ground into a fillet through a grinding tool. The central rotary joint structure has the characteristics of simple structure, convenience and quickness in processing, capability of reducing pressure loss of fluid in the rotary joint and the like.

Description

Central rotary joint structure
Technical Field
The invention relates to the technical field of hydraulic pneumatic conveying pipe fittings, in particular to a central rotary joint structure.
Background
In the hydraulic system of heavy-duty construction machines, the connection of the fluid channels and the electrical circuits of the rotating part to the stationary part is controlled, usually by means of a central rotating joint, with respect to the rotating and stationary parts. The central rotary joint comprises a rotary body, a rotary shaft, a cover and the like, when the central rotary joint is used, the rotary body is fixed with a rotary lower platform of the engineering machinery, and an installation plate on the rotary shaft is connected with a rotary support on a rotary upper platform.
Most of the conventional excavators are wheel-type or walking-type excavators, the number of hydraulic passages of a central swivel joint used for the wheel-type excavators and the walking-type excavators is 16 and 8, and the conventional central swivel joint has fewer hydraulic passages, so that more actions of the excavator or similar machines, such as the climbing function of the excavator, cannot be realized, and the ever-increasing technological requirements cannot be met nowadays.
Axial holes and radial holes in a rotating shaft in the existing rotary joint are machined, and because two mutually perpendicular holes are necessarily provided with grooves and acute angle intersecting lines which are machined in an unnecessary way after machining, the grooves and the acute angle intersecting lines cause fluid pressure loss when fluid flows through the intersecting part of the axial holes and the radial holes, if the whole system has a plurality of fluid pressure losses, the whole energy consumption of fluid transmission is increased, and meanwhile, the pressure increase of other parts in the system is also caused. The increase in pressure will also result in an increase in the structural size and cost of many devices in the system. Although the pressure loss caused by the above-mentioned structure and machining can be overcome by manufacturing the rotary shaft in the rotary joint by casting, the problem of breakdown caused by the high-pressure fluid-conveying type must be overcome by increasing or decreasing the center distance between the holes due to the defects of loose structure, air holes, sand holes, etc. of the cast product, which inevitably increases the structural size of the rotary shaft in the rotary joint, and thus there is a need for improving the structure of the conventional rotary joint.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a central rotary joint structure which is simple in structure, convenient to machine and capable of reducing pressure loss of fluid in a rotary joint.
In order to achieve the purpose, the technical scheme of the invention is to design a central rotary joint structure which comprises a rotary shaft and a rotary body, wherein the rotary shaft is provided with a plurality of rotary shaft axial holes and rotary shaft radial holes which are communicated in an L shape, the rotary body is provided with rotary body radial holes corresponding to the port positions of the rotary shaft radial holes, filling blocks are filled between the hole bottom of the rotary shaft axial holes and the hole wall edge of the rotary shaft radial holes, the shape of each filling block is matched with the shape of one side of the hole bottom of the rotary shaft axial hole, the shape of each filling block positioned on the intersection side of the rotary shaft radial holes and the rotary shaft axial holes is an over cambered surface, and the edge part of the intersection line of the rotary shaft axial holes and the rotary shaft radial holes is ground into a round angle by a.
When the rotary shaft in the central rotary joint is machined, an axial hole can be machined firstly, a radial hole is machined secondly, then the axial hole and the intersecting line of the inner part of the radial hole close to the inner side of the corner are ground into an arc-shaped excessive angle through a grinding tool, and then a filling block which is manufactured in advance is filled between the bottom of the axial hole and the edge of the hole wall of the radial hole of the rotary shaft, namely the outer side of the corner. And finally, sleeving the plastic film 9 or the plastic pipe in the rotary axial hole and the rotary radial hole.
In order to enable fluid to smoothly flow through the axial hole and the radial hole of the rotating shaft, reduce friction force between the fluid and the pipe wall and avoid falling off of the filling block, a preferable technical scheme is that a plastic film or a plastic sleeve is attached to the inner walls of the axial hole and the radial hole of the rotating shaft.
In order to facilitate the combination of the inner wall of the axial hole of the rotating shaft and the inner wall of the radial hole of the rotating shaft with the plastic film or the plastic sleeve, the plastic film is preferably adhered to the inner walls of the axial hole of the rotating shaft and the radial hole of the rotating shaft by plastic spraying or hot melting.
In order to facilitate the combination of the inner wall of the axial hole of the rotating shaft and the inner wall of the radial hole of the rotating shaft with the plastic film or the sleeve, and simultaneously avoid the interference with the end part of the threaded interface, the preferred technical proposal is that both ends of the plastic film or the plastic sleeve are stopped in the threaded section connected with the pipe orifice.
In order to facilitate the processing, manufacturing and installation of the filling block, a further preferable technical scheme is that the filling block is a metal block or a plastic block.
In order to facilitate the grinding processing of the intersection line of the axial hole of the rotating shaft and the inner part of the radial hole of the rotating shaft, which is close to the inner side of the corner, the preferred technical scheme is that the grinding tool comprises a driving head, the driving head is connected with one end of a flexible shaft through a clamping jaw, the other end of the flexible shaft is connected with a grinding head, and a spring hose is sleeved outside the flexible shaft. The driving torque on the driving head of the grinding equipment can be transmitted to the part of the intersection line between the axial hole of the rotating shaft and the inner part of the radial hole of the rotating shaft, which is close to the inner side of the corner, by matching the flexible shaft and the spring hose.
In order to facilitate the grinding processing of the intersecting line of the axial hole of the rotating shaft and the inner part of the radial hole of the rotating shaft close to the inner side of the corner, the further preferable technical scheme is that the core part of the grinding head is a magnetic core, the outer part of the magnetic core is a grinding wheel, the surface of the grinding wheel is provided with an annular groove, and the section of the annular groove is an arc surface. Therefore, the intersecting line of the acute angle shape can be polished into the intersecting line of the arc angle shape through the external shape of the polishing head.
In order to facilitate the grinding processing of the intersecting line of the axial hole of the rotating shaft and the inner part of the radial hole of the rotating shaft close to the inner side of the corner, the further preferable technical scheme is that the driving head is a driving head on a drilling machine or a handheld drill.
The invention has the advantages and beneficial effects that: the central rotary joint structure has the characteristics of simple structure, convenience and quickness in processing, capability of reducing pressure loss of fluid in the rotary joint and the like. The intersection line on the inner side edge of the corner is polished into a round sliding angle through the intersecting position of the axial hole and the inner part of the radial hole, redundant processing process holes on the inner side edge of the corner are filled with filling blocks, and the inner side edge of the corner is also changed into the round sliding angle. Thus, the pressure loss caused by the fluid flowing through the part can be greatly reduced, and the defects of loose structure, air holes, sand holes and the like of the rotating shaft of the casting are overcome
Drawings
FIG. 1 is a schematic cross-sectional view of a center swivel joint structure according to the present invention;
FIG. 2 is an enlarged view of a portion of the fill block of FIG. 1;
fig. 3 is a schematic view of the structure of the grinding tool.
In the figure: 1. a rotating shaft; 2. a revolving body; 3. axial holes of the rotating shaft; 4. radial holes of the rotating shaft; 5. a radial hole of a revolving body; 6. filling blocks; 7. a transition arc surface; 8. round corners; 9. a plastic film; 10. a threaded segment; 11. a drive head; 12. a flexible shaft; 13. polishing head; 13.1, a magnetic core; 13.2, grinding the grinding wheel; 13.3, an annular groove; 14. a spring hose.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1-2, the invention is a central rotary joint structure, which comprises a rotary shaft 1 and a rotary body 2, wherein the rotary shaft 1 is provided with a plurality of rotary shaft axial holes 3 and rotary shaft radial holes 4 which are communicated in an L shape, the rotary body 1 is provided with rotary body radial holes 5 corresponding to the port positions of the rotary shaft radial holes 4, filling blocks 6 are filled between the hole bottom of the rotary shaft axial hole 3 and the hole wall edge of the rotary shaft radial hole 4, the shape of the filling blocks 6 is matched with the shape of one side of the hole bottom of the rotary shaft axial hole 3, the shape of the filling blocks 6 at the intersection side of the rotary shaft radial hole 4 and the rotary shaft axial hole 3 is an excessive cambered surface 7, and the edge part of the intersection line of the rotary shaft axial hole 3 and the rotary shaft radial hole 4 is ground into a round angle 8 by a grinding tool.
When the rotary shaft 1 in the central rotary joint is machined, an axial hole can be machined firstly, a radial hole is machined secondly, then the axial hole and the intersecting line of the inner part of the radial hole, which is close to the inner side of the corner, are ground into an arc-shaped excessive angle through a grinding tool, and then a filling block which is manufactured in advance is filled between the hole bottom of the axial hole and the hole wall edge of the radial hole 4 of the rotary shaft, namely the outer side of the corner. And finally, sleeving the plastic film 9 or the plastic pipe in the rotary axial hole 3 and the rotary radial hole 4.
In order to make the fluid flow smoothly through the axial hole and the radial hole of the rotating shaft 1, reduce the friction force between the fluid and the pipe wall, and prevent the filling block from falling off, the preferred embodiment of the invention is that a plastic film 9 or a plastic sleeve is adhered to the inner wall of the axial hole 3 and the radial hole 4 of the rotating shaft.
In order to facilitate the bonding of the inner wall of the axial bore 3 of the rotary shaft and the inner wall of the radial bore 4 of the rotary shaft to the plastic film or the plastic sleeve, a further preferred embodiment of the invention provides that the plastic film is adhered to the inner walls of the axial bore 3 of the rotary shaft and the radial bore 4 of the rotary shaft by injection molding or hot melt.
In order to facilitate the connection of the inner wall of the axial bore 3 of the rotary shaft and the inner wall of the radial bore 4 of the rotary shaft to the plastic film or the sleeve, while avoiding interference with the end of the screw connection, a preferred embodiment of the invention provides that the plastic film 9 or the plastic sleeve ends within the screw thread section 10 of the pipe orifice connection.
In order to facilitate the manufacturing and installation of the filling block 6, a further preferred embodiment of the present invention is that the filling block 6 is a metal block or a plastic block.
As shown in fig. 3, in order to facilitate the grinding process of the intersection line between the axial hole 3 of the rotating shaft and the inner side of the radial hole 4 of the rotating shaft near the corner, the preferred embodiment of the invention further includes a driving head 11, the driving head 11 is connected with one end of a flexible shaft 12 through a claw, the other end of the flexible shaft 12 is connected with a grinding head 13, and a flexible spring tube 14 is sleeved outside the flexible shaft 12. The driving torque on the driving head 11 of the grinding device can be transmitted to the part of the intersection line of the axial hole 3 of the rotating shaft and the inner part of the radial hole 4 of the rotating shaft, which is close to the inner side of the corner, by the matching use of the flexible shaft 12 and the spring hose 14.
In order to facilitate the grinding processing of the intersecting line of the rotating shaft axial hole 3 and the inner side of the rotating shaft radial hole 4 close to the corner, the further preferable embodiment of the invention is that the core part of the grinding head 13 is a magnetic core 13.1, the outer part of the magnetic core 13.1 is a grinding wheel 13.2, the surface of the grinding wheel 13.2 is provided with an annular groove 13.3, and the section of the annular groove 12.3 is a cambered surface. So that the intersecting line of the acute angle shape can be polished to the intersecting line of the circular arc shape by the external shape of the polishing head 13.
In order to facilitate the grinding of the intersection line between the axial hole 3 of the rotary shaft and the inner side of the radial hole 4 of the rotary shaft near the corner, a further preferred embodiment of the invention provides that the driving head 11 is a driving head on a drilling machine or a hand drill.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. A central rotary joint structure comprises a rotary shaft and a rotary body, wherein the rotary shaft is provided with a plurality of rotary shaft axial holes and rotary shaft radial holes which are communicated in an L shape, the rotary body is provided with rotary body radial holes corresponding to the port positions of the rotary shaft radial holes, and the central rotary joint structure is characterized in that a filling block is filled between the hole bottom of the rotary shaft axial hole and the hole wall edge of the rotary shaft radial hole, the shape of the filling block is matched with the shape of one side of the hole bottom of the rotary shaft axial hole, the shape of the filling block positioned on the intersection side of the rotary shaft radial hole and the rotary shaft axial hole is an over cambered surface, the edge part of the intersecting line of the rotary shaft axial hole and the rotary shaft radial hole is ground into a fillet by a grinding tool, the inner walls of the rotary shaft axial hole and the rotary shaft radial hole are adhered with plastic films or plastic sleeves, and the plastic films are adhered to the inner walls, the grinding tool comprises a driving head, the driving head is connected with one end of a flexible shaft through a clamping jaw, the other end of the flexible shaft is connected with a polishing head, and a spring hose is sleeved outside the flexible shaft.
2. The central swivel joint arrangement of claim 1, wherein the ends of the plastic film or plastic sleeve terminate within the threaded section of the spout connection.
3. The central swivel joint construction according to claim 1, wherein the filler blocks are metal blocks or plastic blocks.
4. The central rotary joint structure according to claim 1, wherein the core of the grinding head is a magnetic core, the outer portion of the magnetic core is a grinding wheel, the surface of the grinding wheel is provided with an annular groove, and the cross section of the annular groove is a cambered surface.
5. The central rotary joint arrangement of claim 2, wherein the drive head is a drive head on a drill press or a hand drill.
CN201810118170.8A 2018-02-06 2018-02-06 Central rotary joint structure Active CN108488523B (en)

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Application Number Priority Date Filing Date Title
CN201810118170.8A CN108488523B (en) 2018-02-06 2018-02-06 Central rotary joint structure

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Application Number Priority Date Filing Date Title
CN201810118170.8A CN108488523B (en) 2018-02-06 2018-02-06 Central rotary joint structure

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CN108488523A CN108488523A (en) 2018-09-04
CN108488523B true CN108488523B (en) 2020-05-19

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110375138A (en) * 2019-06-13 2019-10-25 南京高精船用设备有限公司 A kind of hydraulic separator system
CN110486555A (en) * 2019-08-21 2019-11-22 江苏长龄液压股份有限公司 A kind of monoblock type variable diameter long axis double-rotary center-rotary joint
CN110500464A (en) * 2019-08-21 2019-11-26 江苏长龄液压股份有限公司 A kind of compact center-rotary joint

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002156977A (en) * 2000-11-22 2002-05-31 Mitsubishi Heavy Ind Ltd Muffler
CN2777322Y (en) * 2004-01-17 2006-05-03 康春雨 Water-saving type water delivery tube for hot water
CN201152428Y (en) * 2007-12-18 2008-11-19 董祥顺 Multipath type connector
CN204942855U (en) * 2015-07-15 2016-01-06 浙江万通管业有限公司 Tee union
CN205207991U (en) * 2015-10-27 2016-05-04 江阴市长龄机械制造有限公司 Central rotary joint
CN206708615U (en) * 2017-04-28 2017-12-05 台州超远机械有限公司 It is a kind of curved logical for the welding in automobile engine
CN107435775A (en) * 2017-07-21 2017-12-05 江苏易元新材料科技有限公司 A kind of bend pipe for reducing noise

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2481456Y (en) * 2001-06-01 2002-03-13 青岛迪玛特五金工具有限公司 Flexible shaft chuck abrasive wheel machine with fast clamp device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002156977A (en) * 2000-11-22 2002-05-31 Mitsubishi Heavy Ind Ltd Muffler
CN2777322Y (en) * 2004-01-17 2006-05-03 康春雨 Water-saving type water delivery tube for hot water
CN201152428Y (en) * 2007-12-18 2008-11-19 董祥顺 Multipath type connector
CN204942855U (en) * 2015-07-15 2016-01-06 浙江万通管业有限公司 Tee union
CN205207991U (en) * 2015-10-27 2016-05-04 江阴市长龄机械制造有限公司 Central rotary joint
CN206708615U (en) * 2017-04-28 2017-12-05 台州超远机械有限公司 It is a kind of curved logical for the welding in automobile engine
CN107435775A (en) * 2017-07-21 2017-12-05 江苏易元新材料科技有限公司 A kind of bend pipe for reducing noise

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Address after: 214400 Yun Ting Road 885, Yun Ting Street, Jiangyin, Wuxi, Jiangsu

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Address before: 214400 Yun Ting Road 885, Yun Ting Street, Jiangyin, Wuxi, Jiangsu

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