CN114161363A - General transformer respirator assembly and disassembly tools - Google Patents
General transformer respirator assembly and disassembly tools Download PDFInfo
- Publication number
- CN114161363A CN114161363A CN202111558657.6A CN202111558657A CN114161363A CN 114161363 A CN114161363 A CN 114161363A CN 202111558657 A CN202111558657 A CN 202111558657A CN 114161363 A CN114161363 A CN 114161363A
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- Prior art keywords
- tray
- sliding
- respirator
- support rod
- upper clamp
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- 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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Links
- 238000009434 installation Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000000741 silica gel Substances 0.000 description 10
- 229910002027 silica gel Inorganic materials 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
Images
Classifications
-
- 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
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention relates to a universal type transformer respirator dismounting tool, which comprises an insulating support rod, an upper clamp and a tray, wherein a sliding mechanism is arranged above the insulating support rod, a limiting bolt is arranged on the right side of the sliding mechanism, a connecting plate is arranged on the left side of the sliding mechanism, the upper clamp is arranged on the left side of the connecting plate, a shaft pin is arranged in the joint of the right side of the upper clamp, a fixing bolt is arranged at the joint of the left side of the upper clamp, an installation sleeve is arranged below the insulating support rod, a rotatable support is arranged on the left side of the installation sleeve, a hinge is arranged on the left side of the rotatable support, the tray is arranged on the left side of the hinge, a tray inner cushion is arranged on the inner side of the tray, a non-slip cushion is arranged in the middle of the upper surface of the tray inner cushion, a plurality of sliding chutes are uniformly arranged on the periphery of the non-slip cushion, and limiting plates are arranged above the sliding chutes; the invention has the advantages of simple structure, convenient and quick operation, reduced labor intensity, wide application range and improved working efficiency and operation safety.
Description
Technical Field
The invention belongs to the technical field of transformer respirators, and particularly relates to a universal type transformer respirator dismounting tool.
Background
Along with the rapid development of a power grid, the number of transformers is increasing day by day, an oil immersed transformer mainly comprises a coil, a high-low voltage sleeve, an oil tank, an oil conservator, a breather and the like, wherein the breather is a main component of the oil immersed transformer and is connected with the oil conservator through a pipeline to play a role in communicating atmosphere with the inside of the oil tank of the transformer, color-changing silica gel is filled in the breather and used for absorbing moisture in the air and preventing moisture from entering the oil tank of the transformer to reduce the insulation level of insulating oil, and in order to ensure the safe and reliable operation of the transformer, when the color change of the silica gel in the breather exceeds 2/3, the silica gel needs to be replaced, and the breather needs to be detached when the color change of the silica gel; the traditional transformer respirator generally needs three persons for replacement, when the respirator is disassembled and assembled, one person holds the respirator, the other person disassembles or fastens fasteners such as screws, and the other person to take off the respirator quickly plugs a connecting port between the transformer and the respirator, because the shell at the middle section of the respirator is usually of a glass structure, the respirator needs to be lightly taken and lightly put in the operation process, along with the use of various large transformers, the size and the weight of the respirator become very large, time and labor are wasted in the disassembling and assembling process, the efficiency is low, the respirator is easy to fall off from the hand, the respirator is damaged, and the normal operation of the transformer is influenced; therefore, it is very necessary to provide a universal type transformer respirator dismounting tool which has a simple structure, is convenient and quick to operate, reduces labor intensity, has a wide application range, and improves working efficiency and operation safety.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a universal type transformer respirator dismounting tool which is simple in structure, convenient and quick to operate, capable of reducing labor intensity, wide in application range and capable of improving working efficiency and operation safety.
The purpose of the invention is realized as follows: a universal dismounting tool for a transformer respirator comprises an insulating support rod, an upper clamp and a tray, wherein a sliding mechanism is arranged above the insulating support rod, a sliding sleeve is arranged at the joint of the inside of the sliding mechanism and the insulating support rod, a limiting bolt is arranged on the right side of the sliding mechanism, a connecting plate is arranged on the left side of the sliding mechanism, an upper clamp is arranged on the left side of the connecting plate, a shaft pin is arranged in the joint of the right side of the upper clamp, a fixing bolt is arranged at the joint of the left side of the upper clamp, an installation sleeve is arranged below the insulating support rod, a rotatable support is arranged on the left side of the installation sleeve, a hinge is arranged on the left side of the rotatable support, the tray is arranged on the left side of the hinge, a tray inner cushion is arranged on the inner side of the tray, and a non-slip cushion is arranged in the middle of the upper face of the tray inner cushion, the periphery of the non-slip mat is evenly provided with a plurality of sliding grooves, limiting plates are arranged above the sliding grooves, and sliding blocks are arranged at the joints of the limiting plates and the sliding grooves.
The sliding mechanism is connected with the insulating support rod in a sliding mode through a sliding sleeve, one end of the rotatable support is connected with the insulating support rod through an installation sleeve, the other end of the rotatable support is hinged with the tray through a hinge, and the limiting plate is connected with the sliding groove in a sliding mode through a sliding block.
The limiting plates and the sliding grooves are all provided with four limiting plates which are of arc structures, and the sliding grooves are rectangular grooves.
The non-slip mat and the tray inner mat are made of rubber materials.
The upper clamp is of a hoop structure, one end of the upper clamp can rotate around the pivot pin to open and close, and the other end of the upper clamp is fixed through a fixing bolt.
The invention has the beneficial effects that: the invention relates to a tool for disassembling and assembling a transformer respirator, which mainly comprises an insulating support rod, a sliding mechanism, an upper clamp, a rotatable support, a tray inner pad, a limiting plate and the like, wherein the upper clamp is connected with a transformer pipeline through a fixing bolt and can be fixed on a transformer; one end of the sliding mechanism is connected with the upper clamp, the other end of the sliding mechanism is sleeved with the upper part of the insulating support rod through a sliding sleeve and can slide on the insulating support rod, the height of the device is adjusted according to the size of the respirator, the device is fixed through a limiting bolt, so that the device is suitable for respirators of different models, and the application range is wide; one end of the rotatable support is connected with the insulating support rod through the mounting sleeve, the other end of the rotatable support is hinged with the tray through a hinge, and the tray can horizontally rotate to facilitate taking and placing of the respirator; the tray is provided with four limiting plates, and the retraction and the extension are realized through the sliding block and the sliding groove so as to adjust the diameter of the tray, adapt to respirators of different models and have strong universality; the tray inner pad is made of rubber, so that the collision between a respirator and the device can be prevented in the disassembly process, the abrasion is reduced, in use, the upper clamp is fixed on a transformer pipeline, the height position of the sliding mechanism and the position of the limiting plate on the tray are adjusted according to the size of the respirator, the respirator is conveniently supported, the flange bolt of the respirator is taken down, the tray and the respirator on the tray are turned aside through a hinge, the connecting port is quickly closed, the respirator is taken down, the silica gel is replaced, then the respirator is assembled and disassembled by reverse operation, the replacement work is completed, the device can replace manpower to support the respirator, the respirator is assembled and disassembled by auxiliary operating personnel, the operation is easy and stable, the number of the operating personnel can be reduced, the working strength is reduced, the efficiency is improved, the operating safety is enhanced, and the device is provided with the sliding mechanism, the tray and the limiting plate, the diameter of the tray and the height of the sliding mechanism can be adjusted according to the size of the respirator, the respirator is suitable for various types of respirators, and the universality is strong; the invention effectively solves the problems that the respirator is time-consuming and labor-consuming to disassemble and assemble, the efficiency is low, and the respirator is damaged due to the falling of the falling off hand easily in the replacement operation of the silica gel of the transformer respirator; the invention has the advantages of simple structure, convenient and quick operation, reduced labor intensity, wide application range and improved working efficiency and operation safety.
Drawings
Fig. 1 is a front view of the universal type transformer respirator disassembly and assembly tool of the present invention.
Fig. 2 is a top view of the universal type transformer respirator disassembly and assembly tool of the present invention.
Fig. 3 is a schematic view of the internal structure of the tool for assembling and disassembling a general transformer respirator of the present invention.
In the figure: 1. the device comprises an insulating support rod 2, a sliding mechanism 3, a limiting bolt 4, a connecting plate 5, an upper clamp 6, a shaft pin 7, a fixing bolt 8, a mounting sleeve 9, a rotatable support 10, a hinge 11, a tray 12, a limiting plate 13, a sliding sleeve 14, an anti-skid pad 15, a sliding groove 16, an inner tray pad 17 and a sliding block.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1-3, the universal type transformer respirator dismounting tool comprises an insulating support rod 1, an upper fixture 5 and a tray 11, wherein a sliding mechanism 2 is arranged above the insulating support rod 1, a sliding sleeve 13 is arranged at the joint of the inside of the sliding mechanism 2 and the insulating support rod 1, a limit bolt 3 is arranged at the right side of the sliding mechanism 2, a connecting plate 4 is arranged at the left side of the sliding mechanism 2, the upper fixture 5 is arranged at the left side of the connecting plate 4, a shaft pin 6 is arranged at the inside of the joint of the right side of the upper fixture 5, a fixing bolt 7 is arranged at the joint of the left side of the upper fixture 5, a mounting sleeve 8 is arranged below the insulating support rod 1, a rotatable support 9 is arranged at the left side of the mounting sleeve 8, a hinge 10 is arranged at the left side of the rotatable support 9, and the tray 11 is arranged at the left side of the hinge 10, tray 11 above inboard be provided with tray inner pad 16, tray inner pad 16 above the middle part be provided with slipmat 14, slipmat 14 periphery evenly be provided with a plurality of spout 15, spout 15 top all be provided with limiting plate 12, limiting plate 12 and spout 15 junction all be provided with slider 17.
The invention is a tool for dismounting a transformer respirator, the device mainly comprises an insulating support rod 1, a sliding mechanism 2, an upper clamp 5, a rotatable support 9, a tray 11, a tray inner pad 16, a limiting plate 12 and the like, wherein the upper clamp 5 is connected with a transformer pipeline through a fixing bolt 7, and the device can be fixed on a transformer; one end of the sliding mechanism 2 is connected with the upper clamp 5, the other end of the sliding mechanism is sleeved with the upper part of the insulating support rod 1 through a sliding sleeve 13 and can slide on the insulating support rod 1, the height of the device is adjusted according to the size of the respirator, the device is fixed through a limiting bolt 3 so as to adapt to respirators of different models, and the application range is wide; one end of the rotatable support 9 is connected with the insulating support rod 1 through the mounting sleeve 8, the other end of the rotatable support is hinged with the tray 11 through the hinge 10, and the tray 11 can horizontally rotate so as to facilitate the taking and placing of the respirator; the tray 11 is provided with four limiting plates 12, and the retraction and the extension are realized through the sliding block 17 and the sliding groove 15 so as to adjust the diameter of the tray 11, adapt to respirators of different models and have strong universality; the tray inner pad 16 is made of rubber, the respirator can be prevented from colliding with the device in the dismounting process, abrasion is reduced, in use, the upper clamp 5 is fixed on a transformer pipeline, the height position of the sliding mechanism 2 and the position of the limiting plate 12 on the tray 11 are adjusted according to the size of the respirator, the respirator is conveniently supported, flange bolts of the respirator are taken down, then the tray 11 and the respirator on the tray 11 are turned to one side through the hinge 10, a connecting port is quickly closed, the respirator is taken down, silica gel is replaced, the respirator is mounted and taken down in the reverse operation, the replacement work is completed, the device can replace manpower to support the respirator, auxiliary operating personnel can dismount and mount the respirator, the operation is easy and stable, the number of the operating personnel can be reduced, the working strength is reduced, the efficiency is improved, the operation safety is enhanced, the device is provided with the sliding mechanism 2, the tray 11 and the limiting plate 12, the diameter of the tray 11 and the height of the sliding mechanism 2 can be adjusted according to the size of the respirator, the respirator is suitable for various types of respirators, and the universality is strong; the invention effectively solves the problems that the respirator is time-consuming and labor-consuming to disassemble and assemble, the efficiency is low, and the respirator is damaged due to the falling of the falling off hand easily in the replacement operation of the silica gel of the transformer respirator; the invention has the advantages of simple structure, convenient and quick operation, reduced labor intensity, wide application range and improved working efficiency and operation safety.
Example 2
As shown in fig. 1-3, the universal type transformer respirator dismounting tool comprises an insulating support rod 1, an upper fixture 5 and a tray 11, wherein a sliding mechanism 2 is arranged above the insulating support rod 1, a sliding sleeve 13 is arranged at the joint of the inside of the sliding mechanism 2 and the insulating support rod 1, a limit bolt 3 is arranged at the right side of the sliding mechanism 2, a connecting plate 4 is arranged at the left side of the sliding mechanism 2, the upper fixture 5 is arranged at the left side of the connecting plate 4, a shaft pin 6 is arranged at the inside of the joint of the right side of the upper fixture 5, a fixing bolt 7 is arranged at the joint of the left side of the upper fixture 5, a mounting sleeve 8 is arranged below the insulating support rod 1, a rotatable support 9 is arranged at the left side of the mounting sleeve 8, a hinge 10 is arranged at the left side of the rotatable support 9, and the tray 11 is arranged at the left side of the hinge 10, tray 11 above inboard be provided with tray inner pad 16, tray inner pad 16 above the middle part be provided with slipmat 14, slipmat 14 periphery evenly be provided with a plurality of spout 15, spout 15 top all be provided with limiting plate 12, limiting plate 12 and spout 15 junction all be provided with slider 17.
For better effect, slide mechanism 2 through slip sleeve 13 and insulating support rod 1 sliding connection, but rotatable support 9 one end pass through the installation sleeve 8 and be connected with insulating support rod 1, the other end passes through hinge 10 and tray 11 is articulated, limiting plate 12 pass through slider 17 and spout 15 sliding connection.
For better effect, the limiting plates 12 and the sliding grooves 15 are both provided with four limiting plates 12 which are arc-shaped structures, and the sliding grooves 15 are rectangular grooves.
For better effect, the non-slip mat 14 and the tray inner mat 16 are made of rubber.
For better effect, the upper clamp 5 is a hoop structure with one end capable of rotating around a shaft pin 6 to open and close and the other end fixed through a fixing bolt 7.
The invention is a tool for dismounting a transformer respirator, the device mainly comprises an insulating support rod 1, a sliding mechanism 2, an upper clamp 5, a rotatable support 9, a tray 11, a tray inner pad 16, a limiting plate 12 and the like, wherein the upper clamp 5 is connected with a transformer pipeline through a fixing bolt 7, and the device can be fixed on a transformer; one end of the sliding mechanism 2 is connected with the upper clamp 5, the other end of the sliding mechanism is sleeved with the upper part of the insulating support rod 1 through a sliding sleeve 13 and can slide on the insulating support rod 1, the height of the device is adjusted according to the size of the respirator, the device is fixed through a limiting bolt 3 so as to adapt to respirators of different models, and the application range is wide; one end of the rotatable support 9 is connected with the insulating support rod 1 through the mounting sleeve 8, the other end of the rotatable support is hinged with the tray 11 through the hinge 10, and the tray 11 can horizontally rotate so as to facilitate the taking and placing of the respirator; the tray 11 is provided with four limiting plates 12, and the retraction and the extension are realized through the sliding block 17 and the sliding groove 15 so as to adjust the diameter of the tray 11, adapt to respirators of different models and have strong universality; the tray inner pad 16 is made of rubber, the respirator can be prevented from colliding with the device in the dismounting process, abrasion is reduced, in use, the upper clamp 5 is fixed on a transformer pipeline, the height position of the sliding mechanism 2 and the position of the limiting plate 12 on the tray 11 are adjusted according to the size of the respirator, the respirator is conveniently supported, flange bolts of the respirator are taken down, then the tray 11 and the respirator on the tray 11 are turned to one side through the hinge 10, a connecting port is quickly closed, the respirator is taken down, silica gel is replaced, the respirator is mounted and taken down in the reverse operation, the replacement work is completed, the device can replace manpower to support the respirator, auxiliary operating personnel can dismount and mount the respirator, the operation is easy and stable, the number of the operating personnel can be reduced, the working strength is reduced, the efficiency is improved, the operation safety is enhanced, the device is provided with the sliding mechanism 2, the tray 11 and the limiting plate 12, the diameter of the tray 11 and the height of the sliding mechanism 2 can be adjusted according to the size of the respirator, the respirator is suitable for various types of respirators, and the universality is strong; the invention effectively solves the problems that the respirator is time-consuming and labor-consuming to disassemble and assemble, the efficiency is low, and the respirator is damaged due to the falling of the falling off hand easily in the replacement operation of the silica gel of the transformer respirator; the invention has the advantages of simple structure, convenient and quick operation, reduced labor intensity, wide application range and improved working efficiency and operation safety.
Claims (5)
1. General type transformer respirator assembly and disassembly tools, it includes insulating support rod, goes up anchor clamps and tray, its characterized in that: a sliding mechanism is arranged above the insulating support rod, a sliding sleeve is arranged at the joint of the inside of the sliding mechanism and the insulating support rod, a limiting bolt is arranged on the right side of the sliding mechanism, a connecting plate is arranged on the left side of the sliding mechanism, an upper clamp is arranged on the left side of the connecting plate, a shaft pin is arranged in the joint of the right side of the upper clamp, a fixing bolt is arranged at the joint of the left side of the upper clamp, an installation sleeve is arranged below the insulating support rod, a rotatable support is arranged on the left side of the installation sleeve, a hinge is arranged on the left side of the rotatable support, a tray is arranged on the left side of the hinge, a tray inner pad is arranged on the inner side of the upper surface of the tray, a non-slip pad is arranged in the middle of the upper surface of the tray inner pad, a plurality of sliding grooves are uniformly arranged on the periphery of the non-slip pad, and limiting plates are arranged above the sliding grooves, and sliding blocks are arranged at the joints of the limiting plates and the sliding grooves.
2. The universal transformer respirator disassembly tool of claim 1, wherein: the sliding mechanism is connected with the insulating support rod in a sliding mode through a sliding sleeve, one end of the rotatable support is connected with the insulating support rod through an installation sleeve, the other end of the rotatable support is hinged with the tray through a hinge, and the limiting plate is connected with the sliding groove in a sliding mode through a sliding block.
3. The universal transformer respirator disassembly tool of claim 1, wherein: the limiting plates and the sliding grooves are all provided with four limiting plates which are of arc structures, and the sliding grooves are rectangular grooves.
4. The universal transformer respirator disassembly tool of claim 1, wherein: the non-slip mat and the tray inner mat are made of rubber materials.
5. The universal transformer respirator disassembly tool of claim 1, wherein: the upper clamp is of a hoop structure, one end of the upper clamp can rotate around the pivot pin to open and close, and the other end of the upper clamp is fixed through a fixing bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111558657.6A CN114161363A (en) | 2021-12-20 | 2021-12-20 | General transformer respirator assembly and disassembly tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111558657.6A CN114161363A (en) | 2021-12-20 | 2021-12-20 | General transformer respirator assembly and disassembly tools |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114161363A true CN114161363A (en) | 2022-03-11 |
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ID=80487523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111558657.6A Pending CN114161363A (en) | 2021-12-20 | 2021-12-20 | General transformer respirator assembly and disassembly tools |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114161363A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2804929A1 (en) * | 2000-02-11 | 2001-08-17 | Genus Technologies | CENTERING AND CLAMPING DEVICE, PARTICULARLY FOR PARTS OF AUTOMOTIVE BODYWORK |
| CN104882812A (en) * | 2015-06-09 | 2015-09-02 | 国网山东济南市历城区供电公司 | Multifunctional replacing tool for transformer rebreather |
| CN105006360A (en) * | 2015-08-11 | 2015-10-28 | 国网浙江桐乡市供电公司 | Suspension lifting type silica gel replacement device |
| CN107611831A (en) * | 2017-10-13 | 2018-01-19 | 黄生林 | Application method for assisting respirator dismounting pallet |
| CN107749584A (en) * | 2017-10-26 | 2018-03-02 | 国网江苏省电力公司镇江供电公司 | A kind of transformer breather replacing auxiliary stand |
| CN110112665A (en) * | 2019-05-24 | 2019-08-09 | 国家电网有限公司 | Extra-high voltage main transformer respirator silica gel replaces specific purpose tool |
| CN214254059U (en) * | 2020-12-23 | 2021-09-21 | 国家电网有限公司 | Electric silica gel replacement device for transformer respirator |
-
2021
- 2021-12-20 CN CN202111558657.6A patent/CN114161363A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2804929A1 (en) * | 2000-02-11 | 2001-08-17 | Genus Technologies | CENTERING AND CLAMPING DEVICE, PARTICULARLY FOR PARTS OF AUTOMOTIVE BODYWORK |
| CN104882812A (en) * | 2015-06-09 | 2015-09-02 | 国网山东济南市历城区供电公司 | Multifunctional replacing tool for transformer rebreather |
| CN105006360A (en) * | 2015-08-11 | 2015-10-28 | 国网浙江桐乡市供电公司 | Suspension lifting type silica gel replacement device |
| CN107611831A (en) * | 2017-10-13 | 2018-01-19 | 黄生林 | Application method for assisting respirator dismounting pallet |
| CN107749584A (en) * | 2017-10-26 | 2018-03-02 | 国网江苏省电力公司镇江供电公司 | A kind of transformer breather replacing auxiliary stand |
| CN110112665A (en) * | 2019-05-24 | 2019-08-09 | 国家电网有限公司 | Extra-high voltage main transformer respirator silica gel replaces specific purpose tool |
| CN214254059U (en) * | 2020-12-23 | 2021-09-21 | 国家电网有限公司 | Electric silica gel replacement device for transformer respirator |
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