CN109434146B - Squirrel-cage type core expanding mechanism for field overhaul equipment - Google Patents
Squirrel-cage type core expanding mechanism for field overhaul equipment Download PDFInfo
- Publication number
- CN109434146B CN109434146B CN201811572011.1A CN201811572011A CN109434146B CN 109434146 B CN109434146 B CN 109434146B CN 201811572011 A CN201811572011 A CN 201811572011A CN 109434146 B CN109434146 B CN 109434146B
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- cage
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- 230000007246 mechanism Effects 0.000 title claims abstract description 32
- 230000006835 compression Effects 0.000 claims abstract description 61
- 238000007906 compression Methods 0.000 claims abstract description 61
- 241000555745 Sciuridae Species 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000008439 repair process Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/40—Expansion mandrels
- B23B31/404—Gripping the work or tool by jaws moving radially controlled by conical surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the technical field of nuclear power overhaul, and particularly relates to a squirrel-cage type core expanding mechanism for field overhaul equipment. The squirrel-cage type expanding mechanism comprises a central shaft, a squirrel-cage centering expanding sleeve, a compression spring, a conical tensioning piece and a conical compacting sleeve; the squirrel cage centering tensioning sleeve is sleeved on the central shaft step, and the rotary power box is sleeved on the outer wall of the squirrel cage centering tensioning sleeve and supported on the central shaft lower end step; the squirrel-cage centering tensioning sleeve is provided with a through groove, the inner wall of the rotary power box and the conical compacting sleeve are tightly propped by the compression spring and the multi-petal conical tensioning piece in the through groove, and the rotary power box is automatically tensioned to be concentric with the central shaft by pushing the compression spring and the conical tensioning piece to synchronously and radially run by enabling the conical compacting sleeve to move downwards. The device adopts small clearance fit to realize the quick disassembly and assembly of the rotary part, and is matched with the synchronous tensioning of the conical tensioning piece on the inner hole of the rotary part to realize automatic centering, thereby ensuring the disassembly and assembly rapidness and centering precision of the rotary part and having wide application prospect.
Description
Technical Field
The invention belongs to the technical field of nuclear power overhaul, and particularly relates to a squirrel-cage type core expanding mechanism for field overhaul equipment.
Background
Nuclear island main equipment such as pressure vessels, main pumps and the like repeatedly bear thermal shock and mechanical impact of a loop coolant in an environment with high temperature, high pressure and high discharge medium due to long-time operation, and various defects (including corrosion, cracks, dents, deformation and the like) can be generated on the surface of the equipment, so that the integrity of a pressure-bearing boundary is affected. The nuclear island main equipment is large in size, heavy in weight, non-detachable and radioactive, cannot be returned to factories or can be detected and repaired by using conventional processing equipment, and is required to be repaired by using on-site processing equipment. The larger the size of the field overhaul equipment which is matched with the overhaul of the large-sized main equipment, the more the field overhaul equipment needs to be assembled and debugged in the field during the overhaul, so that a lot of non-working time is generated, and the construction period is prolonged. Particularly, in a nuclear power site, the method is easy to cause large working intensity of operators, long operation time and increased irradiation dose, and is not beneficial to the rapid implementation of site maintenance work. The invention mainly aims at the problems, and develops a squirrel-cage type core expanding mechanism for field overhaul equipment, which can rapidly complete the disassembly and assembly of a rotating part on a supporting base and solve the problems of complicated coaxial adjustment, difficult installation and disassembly and the like of the field overhaul equipment of a large-scale component.
Disclosure of Invention
The invention aims to solve the problem of long assembly time of the existing equipment, and provides a squirrel-cage type core expanding mechanism for on-site equipment maintenance.
The technical scheme of the invention is as follows:
a squirrel-cage type expanding mechanism for field overhaul equipment comprises a central shaft, a squirrel-cage centering expanding sleeve, a compression spring, a conical tensioning piece and a conical compacting sleeve; the central shaft is of a stepped cylindrical structure, the squirrel cage centering tensioning sleeve is sleeved on a central shaft step, and the rotating part is sleeved on the central shaft and the outer wall of the squirrel cage centering tensioning sleeve and is supported on a step at the lower end of the central shaft; the squirrel cage centering tensioning sleeve is provided with a through groove, the inner wall of the rotary part is tightly propped against the inner wall of the rotary part through the compression springs and the multi-petal conical tensioning sheets and the conical compression sleeve sleeved on the upper section of the central shaft, and the rotary part is automatically tensioned to be concentric with the central shaft by pushing the plurality of compression springs and the conical tensioning sheets to synchronously and radially run through downwards moving the conical compression sleeve.
And the upper end of the central shaft is provided with a compression nut for compressing the upper surface of the rotary part.
Further, the compression nut is of a step type cylinder structure, and the outer edge diameter is larger than the outer diameter of the step at the lower part of the central shaft and the outer diameter of the squirrel cage centering tensioning sleeve.
Further, a support ring is provided at the bottom of the center shaft for supporting the rotating member mounted on the center shaft.
Further, the cylinder at the lower part of the supporting ring is connected with the supporting part, the cylinder at the upper part of the supporting ring is in a shape of a two-stage step with thick bottom and thin top, the outer diameter of the lower step is matched with the inner diameter of the rotating part, and the squirrel cage centering tensioning sleeve is arranged between the step at the upper part of the central shaft and the rotating part.
The conical pressing sleeve is a conical sleeve, the inner diameter of the conical pressing sleeve is consistent with the outer diameter of the step on the upper part of the central shaft, the outer diameter of the conical pressing sleeve is of a conical structure, the conical pressing sleeve is arranged at the upper end of the central shaft through threads, and the outer wall of the conical pressing sleeve is tightly attached to the conical tensioning piece.
Further, the top surface of the conical compression sleeve is provided with a plurality of screw holes for being matched with a tool to realize up-and-down rotation of the conical compression sleeve.
Further, the inner wall of the upper top surface of the conical pressing sleeve is also provided with a circular ring-shaped bulge to realize limit.
The squirrel cage centering tensioning sleeve is of a cylindrical structure, the outer wall of the squirrel cage centering tensioning sleeve is consistent with the outer diameter of a step at the lower part of the central shaft, the diameter of the lower section of the inner wall of the squirrel cage centering tensioning sleeve is consistent with the outer diameter of a step at the upper part of the central shaft, and the diameter of the upper section of the squirrel cage centering tensioning sleeve is larger than that of the lower section of the squirrel cage centering tensioning sleeve; the upper end of the inner wall of the device is provided with a plurality of radial through grooves for installing the conical tensioning piece and the compression spring.
The invention also provides field overhaul equipment adopting the squirrel-cage type heart-expanding mechanism, which comprises a supporting component, a rotary power box, the squirrel-cage type heart-expanding mechanism, a control box and a rocker arm component; the support part is fixedly arranged on the flange inner hole of the large component shell, the squirrel-cage type core expanding mechanism is fixedly arranged in the center of the support part, the upper part of the squirrel-cage type core expanding mechanism is connected with the rotary power box, the side surface of the rotary power box is connected with the rocker arm part, and the control box is fixedly arranged above the rotary power box; the rotary power box is controlled to rotate to drive the rocker arm part to rotate, and a cutter carried by the rocker arm part is driven to process and repair the flange sealing surface of the large-sized component shell.
The invention has the beneficial effects that:
the invention aims to solve the problems of complicated coaxial adjustment, difficult installation and detachment and the like in the field use process of the field overhaul equipment of a large-sized component, reduce the working intensity of operators, reduce the irradiation dose and improve the field working efficiency, and provides a squirrel-cage type core expanding mechanism for the field overhaul equipment. The squirrel-cage type centering expanding mechanism adopts small clearance fit to realize the quick disassembly and assembly of the rotating part, and is matched with the conical tensioning piece on the squirrel-cage centering tensioning sleeve to synchronously tension on the inner hole of the rotating part, so that the automatic centering is realized, the disassembly and assembly rapidness and centering precision of the rotating part are ensured, and the squirrel-cage type centering mechanism has wide application prospect.
Drawings
FIG. 1 is a schematic diagram of the installation and use mode of the invention;
FIG. 2 is a schematic view showing the disassembled parts of the present invention;
fig. 3 is a cross-sectional view of the present invention.
In the figure: 1-large component shell, 2-supporting device, 3-rotating power box, 4-squirrel cage type heart-expanding mechanism, 5-control box and 6-rocker arm component; 401-a compression nut, 402-a conical compression sleeve, 403-a compression spring, 404-a conical tension sheet, 405-a squirrel cage centering tension sleeve and 406-a central shaft.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
The embodiment provides a squirrel-cage type core expanding mechanism for field overhaul equipment, which is mainly used for quickly disassembling and assembling a revolving body structure on a supporting base, so that the problems of complicated coaxial adjustment, difficult installation and disassembly and the like of the field overhaul equipment of a large-sized component are solved.
Fig. 1 shows an example of use of a squirrel-cage type core expanding mechanism in this embodiment, and the field maintenance device uses a large-sized component shell 1 such as a flange sealing surface of a pump shell of a nuclear island main pump as a processing object, and mainly includes a supporting component 2, a rotary power box 3, a squirrel-cage type core expanding mechanism 4, a control box 5 and a rocker arm component 6; the support part 2 is fixedly arranged on the inner hole of the flange of the large component shell 1, the squirrel-cage type core expanding mechanism 4 is fixedly arranged in the center of the support part 2, the upper part of the squirrel-cage type core expanding mechanism is connected with the rotary power box 3, the side surface of the rotary power box 3 is connected with the rocker arm part 6, and the control box 5 is fixedly arranged above the rotary power box 3; the rotation of the rotary power box 3 is controlled to drive the rocker arm part 6 to rotate, and a cutter carried by the rocker arm part 6 is driven to process and repair the flange sealing surface of the large-sized component shell 1.
The squirrel-cage type expanding core mechanism is used for supporting the rotating power box 3 and the rocker arm part 6 of the field overhaul equipment and determining the rotating center of the equipment. The structure of the device is shown in fig. 2 and 3, and mainly comprises a central shaft 406, a squirrel cage centering tensioning sleeve 405, a compression spring 403, a conical tensioning piece 404, a compression nut 401 and a conical compression sleeve 402.
As shown in fig. 2 and fig. 3, the central shaft 406 is of a stepped cylindrical structure, and a circular flange is arranged at the bottom of the central shaft as a supporting ring for supporting the rotary power box 3 mounted on the central shaft 406; the cylinder at the lower part of the supporting ring is connected with the center of the supporting part 2, and the outer diameter of the cylinder is matched with the supporting part 2; the cylinder at the upper part of the support ring is in a shape of a two-stage step with a thick lower part and a thin upper part, the outer diameter of the lower step is matched with the inner diameter of the rotary power box 3, and a squirrel cage centering tensioning sleeve 405 is arranged between the upper step of the central shaft 406 and the rotary power box 3; the top of the step on the upper part of the central shaft 406 is provided with external threads for installing the conical compression sleeve 402 and the conical compression cap 401.
As shown in fig. 2 and fig. 3, the squirrel-cage centering tension sleeve 405 has a cylindrical structure, the outer wall of the sleeve is consistent with the outer diameter of the step at the lower part of the central shaft 406, the diameter of the lower section of the inner wall is consistent with the outer diameter of the step at the upper part of the central shaft 406, and the diameter of the upper section is larger than that of the lower section; the upper end of the inner wall of the device is uniformly provided with a plurality of rectangular through grooves along the circumferential direction, and the rectangular through grooves are used for installing conical tensioning plates 404 and compression springs 403, and each through groove is internally provided with a conical tensioning plate 404 which is connected in series by 2 compression springs 403 arranged on the upper surface and the lower surface of the through groove;
as shown in fig. 2 and 3, the compression spring 403 is installed along the circumference of the central shaft 406, and is arranged in the through groove of the squirrel cage centering tensioning sleeve 405 and is positioned between the inner wall of the rotary power box 3 and the conical tensioning piece 404;
as shown in fig. 2 and 3, the conical tensioning piece 404 is a conical surface with an inner surface and a cylindrical surface, and is arranged in a through groove of the squirrel cage centering tensioning sleeve 405 and positioned between the compression spring 403 and the conical compression sleeve 402;
as shown in fig. 2 and 3, the conical compression sleeve 402 is mounted on the upper section of the central shaft 406 through threads, is a conical sleeve, the outer surface of the conical compression sleeve is conical and matched with the inner surface of the conical tension sheet 404, the inner diameter of the conical compression sleeve is consistent with the outer diameter of the step at the upper part of the central shaft 406, the outer diameter of the conical compression sleeve is of a conical structure, the conical compression sleeve is mounted on the upper end of the central shaft 406 through threads, and the outer wall of the conical compression sleeve is tightly attached to the conical tension sheet 404; the top surface of the conical compression sleeve 402 is provided with a plurality of screw holes for matching with a tool to realize the up-and-down rotation of the conical compression sleeve 402; the inner wall of the upper top surface of the conical pressing sleeve 402 is also provided with a circular ring-shaped bulge to realize limit. In use, the conical tension plate 404 and the compression spring 403 are pushed to expand outwards along the circumference of the central shaft 406 by rotating the conical compression sleeve 402 downwards, and the inner wall of the rotary power box 3 is pressed tightly, so that the rotary power box 3 and the central shaft 406 are accurately coaxial.
The conical compression sleeve 402 and the conical tension sheet 404 are made of 45# steel, mechanical properties are guaranteed through quenching and tempering, and surface hardness and wear resistance are improved.
In addition, the conical section of the conical compression sleeve 402 can be designed into an elastic structure, through grooves with a certain length are uniformly distributed and processed from the lower end face along the circumferential direction, when the conical compression sleeve 402 is rotated to move downwards, the outer conical surface of the conical compression sleeve 402 radially pushes the conical tensioning piece 404 outwards to tightly expand the inner wall of the rotary power box 3, and meanwhile, the cylindrical surface of the central shaft 406 is clamped by the cylindrical surface of the inner hole of the conical section of the conical compression sleeve 402, so that the rotary power box 3 is more reliably and firmly connected with the central shaft 406.
As shown in fig. 2 and 3, the compression nut 401 is of a stepped cylindrical structure, and the outer diameter of the outer edge is larger than the outer diameter of the step at the lower part of the central shaft 406 and the outer diameter of the squirrel cage centering tension sleeve 405; in use, the compression nut 401 is mounted to the threaded section of the upper end of the central shaft 406 and compresses the upper surface of the rotary power case 3, thereby better securing the rotary power case 3.
When the automatic power box is used, the central shaft 406 is firstly arranged at the center of the supporting part 2, the rotary power box 3 passes through the surface of the squirrel cage centering tensioning sleeve 405 arranged at the central shaft 406 with a small gap and is supported on the step at the lower end of the central shaft 406, the conical compacting sleeve 402 is driven by a spanner to move downwards, the multi-petal conical tensioning piece 404 supported by the compression spring 403 on the squirrel cage centering tensioning sleeve 405 is pushed to synchronously and radially run, the rotary power box 3 is automatically tensioned to be concentric with the central shaft 406 and is propped against the central shaft 406, and finally the compacting nut 401 is arranged on the threaded section at the upper end of the central shaft 406 and compacts the upper surface of the rotary power box 3, so that the power box 3 is fixed.
After the on-site machining is finished, the compression nut 401 is loosened, the conical compression sleeve 402 is rotated to move upwards, the conical tension sheet 404 is automatically reset under the action of the compression spring 403, separation from the inner hole of the rotary power box 3 is realized, and the on-site overhaul equipment is quickly removed.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. The invention is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A squirrel-cage type heart mechanism that rises for on-spot maintenance equipment, its characterized in that: comprises a central shaft (406), a squirrel cage centering tensioning sleeve (405), a compression spring (403), a conical tensioning piece (404) and a conical compacting sleeve (402); the central shaft (406) is of a stepped cylindrical structure, the squirrel cage centering tensioning sleeve (405) is sleeved on a step of the central shaft (406), and the rotating part is sleeved on the outer walls of the central shaft (406) and the squirrel cage centering tensioning sleeve (405) and is supported on a step at the lower end of the central shaft (406); the squirrel-cage centering tensioning sleeve (405) is provided with a through groove, a compression spring (403) and a conical tensioning piece (404) are arranged in the through groove, the compression spring (403) is circumferentially arranged along a central shaft (406), and the compression spring is arranged in the through groove of the squirrel-cage centering tensioning sleeve (405) and is positioned between the inner wall of the rotary part and the conical tensioning piece (404); the conical compression sleeve (402) is arranged on the upper section of the central shaft (406), and the conical compression sleeve (402) moves downwards to push the conical tension sheet (404) to synchronously and radially run so as to automatically tighten the rotary part to be concentric with and fixed with the central shaft (406); the conical compression sleeve (402) is a conical sleeve, the inner diameter of the conical compression sleeve is consistent with the outer diameter of the step at the upper part of the central shaft (406), the outer diameter of the conical compression sleeve is of a conical structure, the conical compression sleeve is arranged at the upper end of the central shaft (406) through threads, and the outer wall of the conical compression sleeve is tightly attached to the conical tension sheet (404); the inner wall of the upper top surface of the conical pressing sleeve (402) is also provided with a circular ring-shaped bulge to realize limit.
2. A squirrel-cage heart-expanding mechanism for field service equipment as defined in claim 1, wherein: and a compression nut (401) is arranged at the upper end of the central shaft (406) to compress the upper surface of the rotary part.
3. A squirrel-cage heart-expanding mechanism for field maintenance equipment as claimed in claim 1 or 2, wherein: the bottom of the central shaft (406) is provided with a supporting ring for supporting a rotating member mounted on the central shaft (406).
4. A squirrel-cage heart-expanding mechanism for field service equipment as defined in claim 3, wherein: the cylinder at the lower part of the supporting ring is connected with the supporting part (2), the cylinder at the upper part of the supporting ring is in a shape of a two-stage step with a thick lower part and a thin upper part, the outer diameter of the lower step is matched with the inner diameter of the rotating part, and the squirrel cage centering tensioning sleeve (405) is arranged between the upper step of the central shaft (406) and the rotating part.
5. A squirrel-cage heart-expanding mechanism for field service equipment as defined in claim 1, wherein: the top surface of the conical pressing sleeve (402) is provided with a plurality of unthreaded holes for being matched with a tool to realize up-and-down rotation of the conical pressing sleeve (402).
6. A squirrel-cage heart-expanding mechanism for field service equipment as defined in claim 2, wherein: the compression nut (401) is of a step type cylinder structure, and the outer edge diameter is larger than the outer diameter of a step at the lower part of the central shaft (406) and the outer diameter of the squirrel cage centering tensioning sleeve (405).
7. A squirrel-cage heart-expanding mechanism for field maintenance equipment as claimed in claim 1 or 2, wherein: the squirrel cage centering tensioning sleeve (405) is of a cylindrical structure, the outer wall of the squirrel cage centering tensioning sleeve is consistent with the outer diameter of a step at the lower part of the central shaft (406), the diameter of the lower section of the inner wall of the squirrel cage centering tensioning sleeve is consistent with the outer diameter of a step at the upper part of the central shaft (406), and the diameter of the upper section of the squirrel cage centering tensioning sleeve is larger than that of the lower section of the squirrel cage centering tensioning sleeve; the upper end of the inner wall of the sleeve is provided with a plurality of radial through grooves for installing a conical tensioning piece (404) and a compression spring (403).
8. A field service device employing the squirrel cage heart-expanding mechanism for field service devices of claim 1 or 2, characterized in that: comprises a supporting component (2), a rotating component, a squirrel-cage type heart expanding mechanism (4), a control box (5) and a rocker component (6); the support component (2) is fixedly arranged on the flange inner hole of the large-sized component shell (1), the squirrel-cage type heart-expanding mechanism (4) is fixedly arranged at the center of the support component (2), the upper part of the support component is connected with the rotary component, the side surface of the rotary component is connected with the rocker component (6), and the control box (5) is fixedly arranged above the rotary component; the rocker arm part (6) is driven to rotate by controlling the rotation part to rotate, and a cutter carried by the rocker arm part (6) is driven to process and repair the flange sealing surface of the large-sized component shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811572011.1A CN109434146B (en) | 2018-12-21 | 2018-12-21 | Squirrel-cage type core expanding mechanism for field overhaul equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811572011.1A CN109434146B (en) | 2018-12-21 | 2018-12-21 | Squirrel-cage type core expanding mechanism for field overhaul equipment |
Publications (2)
| Publication Number | Publication Date |
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| CN109434146A CN109434146A (en) | 2019-03-08 |
| CN109434146B true CN109434146B (en) | 2024-04-09 |
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| CN201811572011.1A Active CN109434146B (en) | 2018-12-21 | 2018-12-21 | Squirrel-cage type core expanding mechanism for field overhaul equipment |
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| CN109926956B (en) * | 2019-05-06 | 2020-12-08 | 台州佳沃科技有限公司 | Positioning device for component assembly |
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| CN111906685A (en) * | 2020-08-11 | 2020-11-10 | 三门核电有限公司 | A grinder for narrow and small space |
| CN112719957B (en) * | 2020-12-24 | 2021-11-30 | 重庆交通职业学院 | Thin-wall cylindrical part clamp |
| CN113229614B (en) * | 2021-05-25 | 2022-09-30 | 宁波市傲德科智能科技有限公司 | Lifting tea table |
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| JPH08336702A (en) * | 1995-06-13 | 1996-12-24 | Sankyu Inc | Portable flange seal surface processing machine |
| CN102922016A (en) * | 2012-11-08 | 2013-02-13 | 蓬莱巨涛海洋工程重工有限公司 | Flange processing device |
| CN203817430U (en) * | 2014-04-11 | 2014-09-10 | 南京依维柯汽车有限公司 | Floating tensioning device used in small inner holes of shaft tube parts |
| CN104439362A (en) * | 2014-11-25 | 2015-03-25 | 常州市印宝镍网有限公司 | Expansion fixture suitable for blank surfaces |
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| CN109434146A (en) | 2019-03-08 |
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