CN107398673A - A kind of TBM is main to drive wear-resistant strip welding tooling and wear-resistant strip production method - Google Patents
A kind of TBM is main to drive wear-resistant strip welding tooling and wear-resistant strip production method Download PDFInfo
- Publication number
- CN107398673A CN107398673A CN201710902194.8A CN201710902194A CN107398673A CN 107398673 A CN107398673 A CN 107398673A CN 201710902194 A CN201710902194 A CN 201710902194A CN 107398673 A CN107398673 A CN 107398673A
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- wear
- plate
- welding
- resistant strip
- support baseboard
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- 238000003466 welding Methods 0.000 title claims abstract description 91
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 35
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000003698 laser cutting Methods 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
The present invention relates to TBM shield machine manufacturing fields, the main driving wear-resistant strip welding tooling of specifically a kind of TBM and wear-resistant strip production method, including support baseboard, welding procedure groove is offered perpendicular to support baseboard length direction in the middle top surface of the support baseboard；The support baseboard top surface side, straight line is uniformly fixedly installed the datum plate of protrusion along its length；The position that the support baseboard opposite side corresponds to welding procedure groove adjacent reference plate sets limited location adjustable plate；The both sides of welding procedure groove adjacent reference plate are provided with pressure fixed plate, and upper pressure fixed plate both ends are fixed on support baseboard by removable fasteners, the main driving wear-resistant strip welding toolings of TBM and wear-resistant strip production method of the present invention, wearing plate can be effectively avoided in welding process to be distorted in the longitudinal direction deformation, weld seam position wearing plate can be avoided to produce depression simultaneously, ensure that the product quality of only several millimeters thick wear-resistant strips.
Description
Technical field
The present invention relates to TBM shield machine manufacturing fields, the main driving wear-resistant strip welding tooling of specifically a kind of TBM and wear-resisting
Band production method.
Background technology
TBM is the special excavating equipment of mountain tunnel in engineering, the key core equipment in engineering construction, and the main driving of cutterhead
It is the key position of shield machine again, therefore the quality of main driving affects the quality and construction effect of whole shield, and lead
The manufacturing process of the internal abrasion-resistant stee band of driving is core key technology again, correct grasp and redundancy technique, the production domesticization to shield
Great impetus is suffered from internationalization.
Conventional shield owner drives seal wear-resistant ring to use quenching technology for surfaces, and wear ring goes out after short distance is constructed
Now relatively deep abrasion groove, and TBM excavation is apart from longer, operating mode is more complicated, and the influence shaken to sealing is more acute, material
Quenching technology for surfaces can not meet high-performance TBM requirement.The longer mountain tunnel construction in field, without short distance
From the necessary condition for tearing machine overhauling open, this requires main driving sealing to have longer service life.TBM construction environment one
As it is more severe compared with shield machine operating mode, larger vibrations and dust etc. are all to main driving sealing and wear-resisting ring in excavation
Damage larger.When main driving wear-resisting ring abrasion, seal failure, and TBM be in buried depth deeper, no inspection-pit or excavations one
In the case that individual inspection-pit cost is very high, more change owner driving sealing and wear-resisting ring are just into a problem.
The product quality of wear-resistant strip turns into the deciding factor for influenceing the wear-resisting band life-span, and wear-resistant strip overall length is generally 20
Rice, in addition it is longer, it is welded to form by more piece, each section is most long only 3.1 meters, and weld seam is more, and wear-resistant strip alloy thickness only has
1.6mm, slight deformation during welding, is embodied just on whole wear-resistant strip than more significant.The deformation master of weld seam stitching position
There are two kinds of forms, one is the depression perpendicular to face of weld, forms molten bath in welding process, temperature above and below sheet material be present
Difference, welds the relatively low cooling meat first of temperature of side, opposite side during cooling meat then can by outside tension, from
Weld side is observed, and the wear-resisting band plate of weld seam position is depression；The another of weld seam stitching position is deformed into wear-resisting band plate in length
Torsional deformation on direction, same is still too thin because of wear-resisting band plate, and the weld seam of splicing is long, and one weld seam of welding probably needs
The time of 3 minutes, the weld seam of back segment do not complete welding also, and the weld seam of leading portion has shunk shaping, and welding stress is delivered to
The position while welding of back segment, the irregular torsional deformation of whole piece weld seam is caused, therefore, how to overcome wear-resisting band plate in welding process
Deformation turn into emphasis need to solve the problems, such as.
The content of the invention
The defects of goal of the invention of the present invention is to overcome described in background technology, so as to realize that one kind can effectively press down
Produce slight deformation during the main driving wear-resistant strip plate weld of TBM processed, ensure welding quality the main driving wear-resistant strip welding toolings of TBM and
Wear-resistant strip production method.
For achieving the above object, the technical scheme is that：A kind of main driving wear-resistant strip welding toolings of TBM, bag
Support baseboard is included, the top of the support baseboard is plane, is grown in the middle top surface of the support baseboard perpendicular to support baseboard
Degree direction offers welding procedure groove；The support baseboard top surface side, straight line is uniformly fixedly installed protrusion along its length
Datum plate；The position that the support baseboard opposite side corresponds to welding procedure groove adjacent reference plate sets limited location adjustable plate, institute
Its width between datum plate can be adjusted flexibly by stating spacing adjustable plate；The both sides of welding procedure groove adjacent reference plate are provided with
Upper pressure fixed plate, the bottom surface of the upper pressure fixed plate is plane, and upper pressure fixed plate both ends are fixed by removable fasteners
On support baseboard.
As the preferred technical solution of the present invention, the spacing adjustable plate includes spacing plate body, bar hole and detachable tight
Firmware, the bar hole are two through holes being parallel to each other on support baseboard width, and spacing plate body vertical bar shape hole is set
Put, and spacing plate body is fixedly installed on the support baseboard above bar hole by removable fasteners.
As the preferred technical solution of the present invention, the welding procedure groove is to be passed through completely on the width of support baseboard
Logical groove, and the width of welding procedure groove is 2mm ~ 4mm.
As the preferred technical solution of the present invention, the datum plate is symmetrical arranged on welding procedure groove.
As the preferred technical solution of the present invention, removable fasteners are bolt and nut fastener.
A kind of main driving wear-resistant strip production methods of TBM, comprise the following steps：
Step 1：Wear-resistant strip plate cutting, using laser cutting blanking during wear-resistant strip plate cutting, determined according to design requirement more
The wear-resisting band plate of block rectangle.
Step 2：Frock is fixed before welding, prepares a set of main driving wear-resistant strip welding toolings of TBM as described above, by phase
Adjacent two pieces of wear-resisting band plates are placed on support baseboard on the symmetrical apical grafting of welding procedure groove, and datum plate is close in wear-resisting band plate side,
Opposite side is by adjusting spacing adjustable plate clamping fixed；The upper pressure fixed plate of datum plate both sides is pressed on wear-resisting band plate, then
Upper pressure fixed plate both ends are fixed on support baseboard both sides by bolt and nut fastener.
Step 3：Wear-resisting band plate argon arc welding welding, according to field test data, determine speed of welding, the weldering of wear-resisting band plate
Connect electric current, welding amplitude of fluctuation parameter, by two pieces of wear-resisting band plate seams directly over welding procedure groove using argon arc welding and
Special welding wire progressively soldering, accurate control weld seam molten bath shaping in welding process.
Step 4：Weld strength quality test, the weld strength of different welding parameters is contrasted using bender, it is right
Different weld hardness carry out hardness test.
Step 5：Under different temperatures gradient, carry out the actual pyrocondensation of wear-resisting band plate and tested than change, obtain every 10 DEG C swollen
Swollen value, according to material ductility in itself and hot shortness, wear-resistant strip ring diameter, calculated and tested by data, finally
Determine entire length after wear-resisting welding.
Step 6：Whole wear-resistant strip is detected using dye penetrant inspection, determines wear-resistant strip table during blanking, clamping etc.
Face not damaged, weld seam is detected using radiographic inspection, it is ensured that zero defect inside weld seam.
The main driving wear-resistant strip welding toolings of TBM of the present invention and the beneficial effect of wear-resistant strip production method：
1. the main driving wear-resistant strip welding toolings of the TBM of the present invention and wear-resistant strip production method, effectively can be avoided in welding process
Wearing plate is distorted deformation in the longitudinal direction, while weld seam position wearing plate can be avoided to produce depression, be ensure that and is only counted
The product quality of the wear-resistant strip of millimeters thick.
2. the main driving wear-resistant strip welding toolings of the TBM of the present invention and wear-resistant strip production method, ensure that the wear-resistant strip of welding
Total quality, wear-resistant strip surface abrasion is slight, and sealing effectiveness is with the obvious advantage, more adapt to excavate long distance tunnel, it is main driving it is close
Envelope can have longer service life.
Brief description of the drawings
Fig. 1 is the structural representation of the main driving wear-resistant strip welding toolings of the TBM of the present invention；
Fig. 2 is Fig. 1 present invention looks up structural representation.
In figure：1- support baseboards, 2- welding procedure grooves, 3- datum plates, the spacing adjustable plates of 4-, the spacing plate bodys of 401-, 402-
Bar hole, fixed plate, 6- bolt and nut fasteners are pressed on 5-.
Embodiment
Below in conjunction with the accompanying drawings and by specific embodiment main driving wear-resistant strip welding toolings of TBM to the present invention and resistance to
Grinding belt production method does more detailed description.
In the description of the invention, it is to be understood that term " on ", " under ", "front", "rear", "left", "right",
The orientation or position relationship of the instruction such as " top ", " bottom ", " interior ", " outer " are based on orientation shown in the drawings or position relationship, are only
Described for the ease of description is of the invention with simplified, rather than the device or element of instruction or hint meaning must be with specifically sides
Position, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
Embodiment 1：
The main driving wear-resistant strip welding toolings of TBM of the present invention, including support baseboard 1, the top of the support baseboard 1 is plane,
In the middle top surface of the support baseboard 1 welding procedure groove 2 is offered perpendicular to the length direction of support baseboard 1；The support bottom
The top surface side of plate 1, along its length straight line are uniformly fixedly installed the datum plate 3 of protrusion, and the datum plate 3 is on welding procedure
Groove 2 is symmetrical arranged；The position that the opposite side of support baseboard 1 corresponds to the adjacent reference plate 3 of welding procedure groove 2 sets limited location to adjust
Its width between datum plate 3 can be adjusted flexibly in plate 4, the spacing adjustable plate 4；The adjacent reference plate 3 of welding procedure groove 2
Both sides are provided with pressure fixed plate 5, and the bottom surface of the upper pressure fixed plate 5 is plane, and upper pressure fixed plate 5 both ends pass through bolt
Nut fastener 6 is fixed on support baseboard 1.
The spacing adjustable plate 4 includes spacing plate body 401, bar hole 402 and bolt and nut fastener 6, the bar hole
402 be two through holes being parallel to each other on the width of support baseboard 1, and the vertical bar hole 402 of spacing plate body 401 is set, and
Spacing plate body 401 is fixedly installed on by bolt and nut fastener 6 on the support baseboard 1 of the top of bar hole 402.
The welding procedure groove 2 on the width of support baseboard 1 completely through groove, and welding procedure groove 2
Width be 3mm.
A kind of main driving wear-resistant strip production methods of TBM, comprise the following steps：
Step 1：Wear-resistant strip plate cutting, using laser cutting blanking during wear-resistant strip plate cutting, determined according to design requirement more
The wear-resisting band plate of block rectangle；
Step 2：Frock is fixed before welding, prepares a set of main driving wear-resistant strip welding toolings of TBM as described above, by adjacent two
The wear-resisting band plate of block is placed on support baseboard 1 on 2 symmetrical apical grafting of welding procedure groove, and datum plate 3 is close in wear-resisting band plate side, separately
Side is by adjusting the spacing clamping fixed of adjustable plate 4；The upper pressure fixed plate 5 of the both sides of datum plate 3 is pressed on wear-resisting band plate, then
The upper pressure both ends of fixed plate 5 are fixed on the both sides of support baseboard 1 by bolt and nut fastener 6；
Step 3：Wear-resisting band plate argon arc welding welding, according to field test data, determine that the speed of welding of wear-resisting band plate, welding are electric
Two pieces of wear-resisting band plate seams directly over welding procedure groove are utilized argon arc welding and special by stream, welding amplitude of fluctuation parameter
Welding wire progressively soldering, accurate control weld seam molten bath shaping in welding process；
Step 4：Weld strength quality test, the weld strength of different welding parameters is contrasted using bender, to difference
Weld hardness carries out hardness test；
Step 5：Under different temperatures gradient, carry out the actual pyrocondensation of wear-resisting band plate and tested than change, obtain every 10 DEG C of expansion
Value, according to material ductility in itself and hot shortness, wear-resistant strip ring diameter, is calculated and tested by data, it is final true
Entire length after fixed wear-resisting welding；
Step 6：Whole wear-resistant strip is detected using dye penetrant inspection, determine during blanking, clamping etc. wear-resisting belt surface without
Damage, is detected using radiographic inspection to weld seam, it is ensured that zero defect inside weld seam.
The schematical embodiment of the present invention is the foregoing is only, is not limited to the scope of the present invention, it is any
The equivalent variations and modification that those skilled in the art is made on the premise of present inventive concept and principle is not departed from, all should belong to
In the scope of protection of the invention.
Claims (6)
1. a kind of main driving wear-resistant strip welding toolings of TBM, including support baseboard, the top of the support baseboard is plane, and it is special
Sign is：In the middle top surface of the support baseboard welding procedure groove is offered perpendicular to support baseboard length direction；The branch
Support plate top surface side, straight line is uniformly fixedly installed the datum plate of protrusion along its length；The support baseboard opposite side pair
Answer the position of welding procedure groove adjacent reference plate that limited location adjustable plate is set, it can be adjusted flexibly apart from base in the spacing adjustable plate
Width between quasi- plate；The both sides of welding procedure groove adjacent reference plate are provided with pressure fixed plate, under the upper pressure fixed plate
Bottom surface is plane, and upper pressure fixed plate both ends are fixed on support baseboard by removable fasteners.
2. the main driving wear-resistant strip welding toolings of TBM according to claim 1, it is characterised in that：The spacing adjustable plate bag
Spacing plate body, bar hole and removable fasteners are included, the bar hole is two to be parallel to each other on support baseboard width
Bar through hole, spacing plate body vertical bar shape hole are set, and spacing plate body is fixedly installed on above bar hole by removable fasteners
Support baseboard on.
3. the main driving wear-resistant strip welding toolings of TBM according to claim 1, it is characterised in that：The welding procedure groove is
On the width of support baseboard completely through groove, and the width of welding procedure groove is 2mm ~ 4mm.
4. the main driving wear-resistant strip welding toolings of TBM according to claim 1, it is characterised in that：The datum plate is on weldering
Technology groove is connect to be symmetrical arranged.
5. the main driving wear-resistant strip welding toolings of TBM according to claim 1 ~ 4 any one claim, its feature exist
In：Removable fasteners are bolt and nut fastener.
A kind of 6. main driving wear-resistant strip production methods of TBM, it is characterised in that：Comprise the following steps：
Step 1：Wear-resistant strip plate cutting, using laser cutting blanking during wear-resistant strip plate cutting, determined according to design requirement more
The wear-resisting band plate of block rectangle；
Step 2：Frock is fixed before welding, prepares a set of main driving wear-resistant strip welding toolings of TBM as claimed in claim 1, will
Adjacent two pieces of wear-resisting band plates are placed on support baseboard on the symmetrical apical grafting of welding procedure groove, and benchmark is close in wear-resisting band plate side
Plate, opposite side is by adjusting spacing adjustable plate clamping fixed；The upper pressure fixed plate of datum plate both sides is pressed on wear-resisting band plate, connect
And upper pressure fixed plate both ends are fixed on support baseboard both sides by bolt and nut fastener；
Step 3：Wear-resisting band plate argon arc welding welding, according to field test data, determine that the speed of welding of wear-resisting band plate, welding are electric
Two pieces of wear-resisting band plate seams directly over welding procedure groove are utilized argon arc welding and special by stream, welding amplitude of fluctuation parameter
Welding wire progressively soldering, accurate control weld seam molten bath shaping in welding process；
Step 4：Weld strength quality test, the weld strength of different welding parameters is contrasted using bender, to difference
Weld hardness carries out hardness test；
Step 5：Under different temperatures gradient, carry out the actual pyrocondensation of wear-resisting band plate and tested than change, obtain every 10 DEG C of expansion
Value, according to material ductility in itself and hot shortness, wear-resistant strip ring diameter, is calculated and tested by data, it is final true
Entire length after fixed wear-resisting welding；
Step 6：Whole wear-resistant strip is detected using dye penetrant inspection, determine during blanking, clamping etc. wear-resisting belt surface without
Damage, is detected using radiographic inspection to weld seam, it is ensured that zero defect inside weld seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710902194.8A CN107398673A (en) | 2017-09-29 | 2017-09-29 | A kind of TBM is main to drive wear-resistant strip welding tooling and wear-resistant strip production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710902194.8A CN107398673A (en) | 2017-09-29 | 2017-09-29 | A kind of TBM is main to drive wear-resistant strip welding tooling and wear-resistant strip production method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107398673A true CN107398673A (en) | 2017-11-28 |
Family
ID=60388582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710902194.8A Pending CN107398673A (en) | 2017-09-29 | 2017-09-29 | A kind of TBM is main to drive wear-resistant strip welding tooling and wear-resistant strip production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107398673A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113550755A (en) * | 2021-07-14 | 2021-10-26 | 中铁工程装备集团有限公司 | Wear-resisting area and shield constructs owner and drive sealed runway |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001287090A (en) * | 2000-04-10 | 2001-10-16 | Mitsubishi Heavy Ind Ltd | Reference positioning mechanism in butt welding |
| CN101020281A (en) * | 2007-03-06 | 2007-08-22 | 江苏大学 | Deformable welding fixture for plate splicing welding with linear and curved weld seams |
| CN103817400A (en) * | 2014-02-28 | 2014-05-28 | 金川集团股份有限公司 | Arc striking and quenching device for coil-merging welding of nickel base alloy strip and using method of arc striking and quenching device |
| CN205200777U (en) * | 2015-12-11 | 2016-05-04 | 中船重工（青岛）轨道交通装备有限公司 | Wear -resisting tape welding connects frock |
| CN207223284U (en) * | 2017-09-29 | 2018-04-13 | 中铁工程装备集团盾构制造有限公司 | A kind of main driving wear-resistant strip welding toolings of TBM |
-
2017
- 2017-09-29 CN CN201710902194.8A patent/CN107398673A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001287090A (en) * | 2000-04-10 | 2001-10-16 | Mitsubishi Heavy Ind Ltd | Reference positioning mechanism in butt welding |
| CN101020281A (en) * | 2007-03-06 | 2007-08-22 | 江苏大学 | Deformable welding fixture for plate splicing welding with linear and curved weld seams |
| CN103817400A (en) * | 2014-02-28 | 2014-05-28 | 金川集团股份有限公司 | Arc striking and quenching device for coil-merging welding of nickel base alloy strip and using method of arc striking and quenching device |
| CN205200777U (en) * | 2015-12-11 | 2016-05-04 | 中船重工（青岛）轨道交通装备有限公司 | Wear -resisting tape welding connects frock |
| CN207223284U (en) * | 2017-09-29 | 2018-04-13 | 中铁工程装备集团盾构制造有限公司 | A kind of main driving wear-resistant strip welding toolings of TBM |
Non-Patent Citations (1)
| Title |
|---|
| 杨宏伟等: "石油钻杆接头焊接耐磨带的工艺", 《焊接技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113550755A (en) * | 2021-07-14 | 2021-10-26 | 中铁工程装备集团有限公司 | Wear-resisting area and shield constructs owner and drive sealed runway |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171128 |
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| RJ01 | Rejection of invention patent application after publication |