CN108626562B - Center rotary joint of main driving frame of shield machine - Google Patents
Center rotary joint of main driving frame of shield machine Download PDFInfo
- Publication number
- CN108626562B CN108626562B CN201810553337.3A CN201810553337A CN108626562B CN 108626562 B CN108626562 B CN 108626562B CN 201810553337 A CN201810553337 A CN 201810553337A CN 108626562 B CN108626562 B CN 108626562B
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- Prior art keywords
- ring
- sleeve
- annular
- foam liquid
- lubricating oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000007789 sealing Methods 0.000 claims abstract description 69
- 239000006260 foam Substances 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 43
- 239000010687 lubricating oil Substances 0.000 claims abstract description 36
- 238000007667 floating Methods 0.000 claims description 16
- 230000005641 tunneling Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- F16N—LUBRICATING
- F16N21/00—Conduits; Junctions; Fittings for lubrication apertures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Sealing Devices (AREA)
Abstract
The invention provides a center rotary joint of a main driving frame of a shield machine, which comprises a T-shaped shaft, wherein a first annular sleeve is sleeved outside the T-shaped shaft, a lubricating oil inlet is formed in the first annular sleeve, a lubricating oil annular groove communicated with the lubricating oil inlet is formed in the inner wall of the first annular sleeve, and a lubricating oil channel communicated with a lubricating oil ring groove is formed in the T-shaped shaft; the outer side of the first loop is sleeved with a second loop, and a foam liquid channel is arranged in the second loop; the outer side of the second annular sleeve is sleeved with a third annular sleeve, a foam liquid inlet is formed in the third annular sleeve, a foam liquid annular groove communicated with the foam liquid inlet is formed in the inner wall of the third annular sleeve, and the foam liquid annular groove is communicated with the foam liquid channel; the outer side of the third ring sleeve is sleeved with a sealing rim, and the outer side of the sealing rim is sleeved with a shell. The center rotary joint of the main driving frame of the shield machine adopts a coaxial structural design, so that the axial dimension is greatly reduced under the condition that the radial dimension is hardly changed, the structure is more compact, the volume is reduced, and the occupied space is reduced.
Description
Technical Field
The invention belongs to the technical field of tunnel construction equipment by a shield method, and particularly relates to a center rotary joint of a main driving frame of a shield machine.
Background
The central rotary joint of the shield machine is used as an important component of the shield machine and is used for injecting foam liquid, lubricating oil and the like into the front region of the cutterhead. The existing center rotary joint is larger in axial dimension, not compact in structure and large in occupied space, as shown in fig. 2, and is a structural schematic diagram of the center rotary joint of the shield tunneling machine in the prior art, and the center rotary joint consists of a front end of a rotary body and a rear end of the rotary body, and is larger in axial dimension and occupies larger space inside the shield tunneling machine.
Disclosure of Invention
In view of the above, the present invention provides a central swivel joint of a main driving frame of a shield machine, which adopts a coaxial structural design, and greatly reduces the axial dimension under the condition that the radial dimension is hardly changed, so that the structure of the central swivel joint becomes more compact, the volume is reduced, and the occupied space is reduced.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the center rotary joint of the main driving frame of the shield machine comprises a T-shaped shaft, wherein the T-shaped shaft comprises a circular front end plate and a central shaft which is arranged at the center of the front end plate and is vertically and fixedly connected with the front end plate; the front end plate is fixedly connected with the center of a cutter head of the shield machine;
the outer side of the central shaft is sleeved with a first ring sleeve, a first sealing ring is arranged between the first ring sleeve and the central shaft, and the first ring sleeve is fixedly connected with a front shield of the shield machine; the first annular sleeve is provided with a lubricating oil inlet, the inner wall of the first annular sleeve is provided with a plurality of lubricating oil ring grooves communicated with the lubricating oil inlet, the T-shaped shaft is internally provided with a plurality of lubricating oil channels, and the lubricating oil channels are communicated with the lubricating oil ring grooves;
A second ring sleeve is sleeved outside the first ring sleeve, a second sealing ring is arranged between the second ring sleeve and the first ring sleeve, and the front end of the second ring sleeve is fixedly connected with the T-shaped shaft; a plurality of foam liquid channels are arranged in the second annular sleeve, and a second foam liquid channel communicated with the foam liquid channels is arranged in the front end plate; a third ring sleeve is sleeved outside the second ring sleeve, a third sealing ring is arranged between the third ring sleeve and the second ring sleeve, and the third ring sleeve is fixedly connected with the front shield; the third annular sleeve is provided with a foam liquid inlet, the inner wall of the third annular sleeve is provided with a plurality of foam liquid annular grooves communicated with the foam liquid inlet, and the foam liquid annular grooves are communicated with the foam liquid channel;
the sealing rim is sleeved outside the third ring sleeve, and the front end face of the sealing rim is fixedly connected with the front end plate; the outer side of the sealing rim is sleeved with a shell, a fourth sealing ring is arranged between the shell and the sealing rim, and the shell is fixedly connected with the front shield.
Further, the center shaft is of a step structure, the diameter of the front half part of the center shaft is larger than that of the rear half part, the first ring sleeve is sleeved on the rear half part of the center shaft, and the front end face of the first ring sleeve and the step face of the front half part of the center shaft can be connected in a relative rotating mode through a roller pin bearing.
Further, the front end face of the third ring sleeve is connected with the front end plate in a relatively rotatable manner through a sliding bearing.
Further, the second sealing ring is a floating sealing ring; an annular floating sealing ring groove is formed in the inner side wall of the second annular sleeve along the circumferential direction, the floating sealing ring is installed in the floating sealing ring groove, and the inner side surface of the floating sealing ring is in contact with the outer side surface of the first annular sleeve.
Further, the fourth sealing ring is a double-lip sealing ring; an annular double-lip sealing ring mounting groove is formed in the outer side face of the sealing rim along the circumferential direction, the double-lip sealing ring is mounted in the double-lip sealing ring mounting groove, and the outer side face of the double-lip sealing ring is in contact with the inner side face of the shell.
Compared with the prior art, the center rotary joint of the main driving frame of the shield machine has the following advantages:
(1) The central rotary joint of the main driving frame of the shield machine adopts the coaxial design that the T-shaped shaft, the first annular sleeve, the second annular sleeve, the third annular sleeve, the sealing rim and the shell are mutually sleeved, so that the axial size is greatly reduced, and the first annular sleeve, the second annular sleeve, the third annular sleeve and the sealing rim are mutually sleeved due to the T-shaped structure of the T-shaped shaft, but the radial size of the whole structure is hardly changed, the whole structure is more compact, the volume is smaller, the internal space of the shield machine is occupied, and the production cost is effectively reduced;
(2) The coaxial design of the center rotary joint of the main driving frame of the shield machine enables the pipeline arrangement for lubricating oil and foam liquid to flow through to be more reasonable and compact, improves the high-efficiency passing performance of media (lubricating oil and foam liquid) in the center rotary joint, and further reduces the cost;
(3) The front end face of the first ring sleeve of the center rotary joint of the main driving frame of the shield machine is in relative rotary connection with the step face of the front half part of the central shaft through the roller pin type bearing, the installation of the roller pin type bearing further ensures the compactness and high efficiency of the axial structure, and meanwhile, the sensitivity of relative rotation between the first ring sleeve and the central shaft is improved;
(4) The second sealing ring between the second ring sleeve and the first ring sleeve of the central rotary joint of the main driving frame of the shield machine is a floating sealing ring, and the special structure of the floating sealing ring further ensures the axial tightness and is more reasonable than the sealing design of the traditional central rotary joint;
(5) The sealing structure of each part of the center rotary joint of the main driving frame of the shield machine is reasonable in design, has a good sealing effect, does not occupy excessive space, and further reduces the size of the whole structure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute an undue limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a center swivel joint of a main driving frame of a shield tunneling machine according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a center revolving structure of a shield tunneling machine in the prior art.
Reference numerals illustrate:
A 1-T-shaped shaft; 2-a front end plate; 3-a central axis; 4-a third sealing ring; 5-a first loop; 6-a first sealing ring; 7-front shield; 8-a lubricating oil inlet; 9-a lubricating oil annular groove; 10-lubricating oil passages; 11-a second collar; 12-a second sealing ring; 13-foam liquid channel; 14-a third collar; 15-foam liquid inlet; 16-foam liquid annular groove; 17-sealing the rim; 18-a housing; 19-a fourth sealing ring; 20-rolling needle type bearing; 21-a sliding bearing; 22-second foam liquid channel.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, a center swivel joint of a main driving frame of a shield machine comprises a T-shaped shaft 1, a first annular sleeve 5, a second annular sleeve 11, a third annular sleeve 14, a sealing rim 17 and a shell 18;
The T-shaped shaft 1 comprises a circular front end plate 2 and a central shaft 3 which is arranged at the center of the front end plate 2 and is vertically and fixedly connected with the front end plate 2; the front end plate 2 is fixedly connected with the center of a cutter head of the shield machine through bolts;
The central shaft 3 is of a step-shaped structure, the diameter of the front half part of the central shaft 3 is larger than that of the rear half part, the first annular sleeve 5 is sleeved on the rear half part of the central shaft 3, the front end surface of the first annular sleeve 5 and the step surface of the front half part of the central shaft 3 are connected in a relatively rotatable manner through a roller pin type bearing 20, and the first annular sleeve 5 is fixedly connected with a front shield 7 of the shield machine; annular first seal ring grooves are formed in the inner side wall of the first ring sleeve 5 along the circumferential direction, a plurality of first seal ring grooves are distributed at equal intervals along the axial direction of the inner side wall of the first ring sleeve 5, first seal rings 6 are arranged in the first seal ring grooves, and the inner side surfaces of the first seal rings 6 are in contact with the central shaft 3; the first annular sleeve 5 is provided with a lubricating oil inlet 8, the inner wall of the first annular sleeve 5 is provided with a plurality of lubricating oil annular grooves 9 which are communicated with the lubricating oil inlet 8 and used for lubricating oil to pass through, the T-shaped shaft 1 is internally provided with a plurality of lubricating oil channels 10, the lubricating oil channels 10 are communicated with the lubricating oil ring grooves 9, and the lubricating oil entering from the lubricating oil inlet 8 enters the lubricating oil ring grooves 9 and then enters the lubricating oil channels 10, and finally is injected into the front region of the cutterhead through the lubricating oil channels 10;
The outer side of the first ring sleeve 5 is sleeved with a second ring sleeve 11, and the front end surface of the second ring sleeve 11 is fixedly connected with the T-shaped shaft 1; an annular floating seal ring groove is formed in the inner side wall of the second annular sleeve 11 along the circumferential direction, a floating seal ring, namely a second seal ring 12, is arranged in the floating seal ring groove, and the inner side surface of the floating seal ring is contacted with the outer side surface of the first annular sleeve 5;
The outer side of the second ring sleeve 11 is sleeved with a third ring sleeve 14, the third ring sleeve 14 is fixedly connected with the front shield 7, and the front end surface of the third ring sleeve 14 is in relative rotary connection with the front end plate 2 through a sliding bearing 21; the inner side wall of the third ring sleeve 14 is provided with a plurality of annular third sealing ring grooves along the circumferential direction, the plurality of third sealing ring grooves are distributed at equal intervals along the axial direction of the inner side wall of the third ring sleeve 14, a third sealing ring 4 is arranged in the third sealing ring groove, and the inner side surface of the third sealing ring 4 is contacted with the outer side surface of the second ring sleeve 11; the third annular sleeve 14 is provided with a foam liquid inlet 15, the inner wall of the third annular sleeve 14 is provided with a plurality of foam liquid annular grooves 16 communicated with the foam liquid inlet 15 and used for foam liquid to pass through, the second annular sleeve 11 is internally provided with a plurality of foam liquid channels 13, and the front end plate 2 is internally provided with a second foam liquid channel 22 communicated with the foam liquid channels 13; the foam liquid channel 13 is communicated with the foam liquid annular groove 16, and foam liquid entering from the foam liquid inlet 15 enters the foam liquid annular groove 16, then enters the foam liquid channel 13, flows into the second foam liquid channel 22, and finally is injected into the front area of the cutterhead;
The outer side of the third ring sleeve 14 is sleeved with a sealing rim 17, and the front end surface of the sealing rim 17 is fixedly connected with the front end plate 2 through bolts; the outer side of the sealing rim 17 is sleeved with a shell 18, and the shell 18 is fixedly connected with the front shield 7; an annular double-lip sealing ring mounting groove is formed in the outer side face of the sealing rim 17 along the circumferential direction, two double-lip sealing ring mounting grooves are formed, a double-lip sealing ring, namely a fourth sealing ring 19 is arranged in the double-lip sealing ring mounting groove, and the outer side face of the double-lip sealing ring is in contact with the inner side face of the shell 18.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The center swivel joint of the main driving frame of the shield machine is characterized in that: the novel structure comprises a T-shaped shaft (1), wherein the T-shaped shaft (1) comprises a round front end plate (2) and a central shaft (3) which is arranged at the center of the front end plate (2) and is vertically fixedly connected with the front end plate (2); the front end plate (2) is fixedly connected with the center of a cutter head of the shield machine; a first annular sleeve (5) is sleeved outside the central shaft (3), a first sealing ring (6) is arranged between the first annular sleeve (5) and the central shaft (3), and the first annular sleeve (5) is fixedly connected with a front shield (7) of the shield machine; the novel lubricating oil box is characterized in that a lubricating oil inlet (8) is formed in the first annular sleeve (5), a plurality of lubricating oil ring grooves (9) communicated with the lubricating oil inlet (8) are formed in the inner wall of the first annular sleeve (5), a plurality of lubricating oil channels (10) are formed in the T-shaped shaft (1), and the lubricating oil channels (10) are communicated with the lubricating oil ring grooves (9); a second ring sleeve (11) is sleeved outside the first ring sleeve (5), a second sealing ring (12) is arranged between the second ring sleeve (11) and the first ring sleeve (5), and the front end of the second ring sleeve (11) is fixedly connected with the T-shaped shaft (1); a plurality of foam liquid channels (13) are arranged in the second annular sleeve (11), and a second foam liquid channel (22) communicated with the foam liquid channels (13) is arranged in the front end plate (2); a third ring sleeve (14) is sleeved outside the second ring sleeve (11), a third sealing ring (4) is arranged between the third ring sleeve (14) and the second ring sleeve (11), and the third ring sleeve (14) is fixedly connected with the front shield (7); a foam liquid inlet (15) is formed in the third annular sleeve (14), a plurality of foam liquid annular grooves (16) communicated with the foam liquid inlet (15) are formed in the inner wall of the third annular sleeve (14), and the foam liquid annular grooves (16) are communicated with the foam liquid channel (13); a sealing rim (17) is sleeved outside the third ring sleeve (14), and the front end surface of the sealing rim (17) is fixedly connected with the front end plate (2); a shell (18) is sleeved outside the sealing rim (17), a fourth sealing ring (19) is arranged between the shell (18) and the sealing rim (17), and the shell (18) is fixedly connected with the front shield (7);
The central shaft (3) is of a step-shaped structure, the diameter of the front half part of the central shaft (3) is larger than that of the rear half part, the first annular sleeve (5) is sleeved on the rear half part of the central shaft (3), and the front end surface of the first annular sleeve (5) is in relative rotary connection with the step surface of the front half part of the central shaft (3) through a roller pin bearing (20);
the front end face of the third ring sleeve (14) is in relative rotation connection with the front end plate (2) through a sliding bearing (21).
2. The shield tunneling machine main driving frame center swivel joint according to claim 1, wherein: the second sealing ring (12) is a floating sealing ring; an annular floating seal ring groove is formed in the inner side wall of the second annular sleeve (11) along the circumferential direction, the floating seal ring is installed in the floating seal ring groove, and the inner side surface of the floating seal ring is in contact with the outer side surface of the first annular sleeve (5).
3. The shield tunneling machine main driving frame center swivel joint according to any one of claims 1-2, wherein: the fourth sealing ring (19) is a double-lip sealing ring; an annular double-lip sealing ring mounting groove is formed in the outer side face of the sealing rim (17) along the circumferential direction, the double-lip sealing ring is mounted in the double-lip sealing ring mounting groove, and the outer side face of the double-lip sealing ring is in contact with the inner side face of the shell (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810553337.3A CN108626562B (en) | 2018-05-31 | 2018-05-31 | Center rotary joint of main driving frame of shield machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810553337.3A CN108626562B (en) | 2018-05-31 | 2018-05-31 | Center rotary joint of main driving frame of shield machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108626562A CN108626562A (en) | 2018-10-09 |
| CN108626562B true CN108626562B (en) | 2024-04-26 |
Family
ID=63690792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810553337.3A Active CN108626562B (en) | 2018-05-31 | 2018-05-31 | Center rotary joint of main driving frame of shield machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108626562B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10332010A1 (en) * | 2003-07-14 | 2005-02-03 | Franz Kessler Kg | Rotary duct for rotor, e.g. shaft, comprises longitudinal bore, bushes being mounted transversely in shaft housing which have seals on their inner ends sealing their connections with bore as shaft rotates |
| WO2012163556A1 (en) * | 2011-05-31 | 2012-12-06 | Schaeffler Technologies AG & Co. KG | Rotary union with sealing sleeve |
| CN104329556A (en) * | 2014-09-20 | 2015-02-04 | 辽宁三三工业有限公司 | Shield tunneling machine central turning joint |
| CN205938277U (en) * | 2016-08-11 | 2017-02-08 | 山东德立信液压有限公司 | 6 tonner wheeled excavator of air flue self -lubricating uses central swivel joint |
| DE102016102535A1 (en) * | 2016-02-15 | 2017-08-17 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | connecting sleeve |
| CN108035719A (en) * | 2017-12-01 | 2018-05-15 | 辽宁三三工业有限公司 | A kind of shield machine |
| CN208566138U (en) * | 2018-05-31 | 2019-03-01 | 辽宁三三工业有限公司 | Shield owner's driver framework centre revolving joint |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2645236A1 (en) * | 2008-11-03 | 2010-05-03 | Imad Hamad | Submersed turbine bearings |
-
2018
- 2018-05-31 CN CN201810553337.3A patent/CN108626562B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10332010A1 (en) * | 2003-07-14 | 2005-02-03 | Franz Kessler Kg | Rotary duct for rotor, e.g. shaft, comprises longitudinal bore, bushes being mounted transversely in shaft housing which have seals on their inner ends sealing their connections with bore as shaft rotates |
| WO2012163556A1 (en) * | 2011-05-31 | 2012-12-06 | Schaeffler Technologies AG & Co. KG | Rotary union with sealing sleeve |
| CN104329556A (en) * | 2014-09-20 | 2015-02-04 | 辽宁三三工业有限公司 | Shield tunneling machine central turning joint |
| DE102016102535A1 (en) * | 2016-02-15 | 2017-08-17 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | connecting sleeve |
| CN205938277U (en) * | 2016-08-11 | 2017-02-08 | 山东德立信液压有限公司 | 6 tonner wheeled excavator of air flue self -lubricating uses central swivel joint |
| CN108035719A (en) * | 2017-12-01 | 2018-05-15 | 辽宁三三工业有限公司 | A kind of shield machine |
| CN208566138U (en) * | 2018-05-31 | 2019-03-01 | 辽宁三三工业有限公司 | Shield owner's driver framework centre revolving joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108626562A (en) | 2018-10-09 |
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